dighost.c revision efb028b6c879c67b4e5b858f0e318a57b1073f69
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews/*
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews * Copyright (C) 2004-2015 Internet Systems Consortium, Inc. ("ISC")
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews * Copyright (C) 2000-2003 Internet Software Consortium.
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews *
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews * Permission to use, copy, modify, and/or distribute this software for any
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews * purpose with or without fee is hereby granted, provided that the above
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews * copyright notice and this permission notice appear in all copies.
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews *
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews * PERFORMANCE OF THIS SOFTWARE.
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews */
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews/*! \file
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews * \note
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews * Notice to programmers: Do not use this code as an example of how to
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews * use the ISC library to perform DNS lookups. Dig and Host both operate
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews * on the request level, since they allow fine-tuning of output and are
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews * intended as debugging tools. As a result, they perform many of the
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews * functions which could be better handled using the dns_resolver
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews * functions in most applications.
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews */
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews
a39a5f4d816ca7d3f43106712ca668dd1ab31d69Mark Andrews#include <config.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <limits.h>
#ifdef HAVE_LOCALE_H
#include <locale.h>
#endif
#ifdef WITH_IDN
#include <idn/result.h>
#include <idn/log.h>
#include <idn/resconf.h>
#include <idn/api.h>
#endif
#include <dns/byaddr.h>
#ifdef DIG_SIGCHASE
#include <dns/callbacks.h>
#include <dns/dnssec.h>
#include <dns/ds.h>
#include <dns/master.h>
#include <dns/nsec.h>
#include <isc/random.h>
#include <ctype.h>
#endif
#include <dns/fixedname.h>
#include <dns/log.h>
#include <dns/message.h>
#include <dns/name.h>
#include <dns/rcode.h>
#include <dns/rdata.h>
#include <dns/rdataclass.h>
#include <dns/rdatalist.h>
#include <dns/rdataset.h>
#include <dns/rdatastruct.h>
#include <dns/rdatatype.h>
#include <dns/result.h>
#include <dns/tsig.h>
#include <dst/dst.h>
#include <dst/result.h>
#include <isc/app.h>
#include <isc/base64.h>
#include <isc/entropy.h>
#include <isc/file.h>
#include <isc/hex.h>
#include <isc/lang.h>
#include <isc/log.h>
#include <isc/netaddr.h>
#include <isc/netdb.h>
#include <isc/parseint.h>
#include <isc/print.h>
#include <isc/random.h>
#include <isc/result.h>
#include <isc/serial.h>
#include <isc/sockaddr.h>
#include <isc/string.h>
#include <isc/task.h>
#include <isc/timer.h>
#include <isc/types.h>
#include <isc/util.h>
#include <isccfg/namedconf.h>
#include <lwres/lwres.h>
#include <lwres/net.h>
#include <bind9/getaddresses.h>
#include <dig/dig.h>
#ifdef PKCS11CRYPTO
#include <pk11/result.h>
#endif
#if ! defined(NS_INADDRSZ)
#define NS_INADDRSZ 4
#endif
#if ! defined(NS_IN6ADDRSZ)
#define NS_IN6ADDRSZ 16
#endif
static lwres_context_t *lwctx = NULL;
static lwres_conf_t *lwconf;
dig_lookuplist_t lookup_list;
dig_serverlist_t server_list;
dig_searchlistlist_t search_list;
isc_boolean_t
check_ra = ISC_FALSE,
have_ipv4 = ISC_FALSE,
have_ipv6 = ISC_FALSE,
specified_source = ISC_FALSE,
free_now = ISC_FALSE,
cancel_now = ISC_FALSE,
usesearch = ISC_FALSE,
showsearch = ISC_FALSE,
qr = ISC_FALSE,
is_dst_up = ISC_FALSE,
keep_open = ISC_FALSE,
verbose = ISC_FALSE;
in_port_t port = 53;
unsigned int timeout = 0;
unsigned int extrabytes;
isc_mem_t *mctx = NULL;
isc_log_t *lctx = NULL;
isc_taskmgr_t *taskmgr = NULL;
isc_task_t *global_task = NULL;
isc_timermgr_t *timermgr = NULL;
isc_socketmgr_t *socketmgr = NULL;
isc_sockaddr_t bind_address;
isc_sockaddr_t bind_any;
int sendcount = 0;
int recvcount = 0;
int sockcount = 0;
int ndots = -1;
int tries = 3;
int lookup_counter = 0;
static char servercookie[256];
#ifdef WITH_IDN
static void initialize_idn(void);
static isc_result_t output_filter(isc_buffer_t *buffer,
unsigned int used_org,
isc_boolean_t absolute);
static idn_result_t append_textname(char *name, const char *origin,
size_t namesize);
static void idn_check_result(idn_result_t r, const char *msg);
#define MAXDLEN 256
int idnoptions = 0;
#endif
isc_socket_t *keep = NULL;
isc_sockaddr_t keepaddr;
/*%
* Exit Codes:
*
*\li 0 Everything went well, including things like NXDOMAIN
*\li 1 Usage error
*\li 7 Got too many RR's or Names
*\li 8 Couldn't open batch file
*\li 9 No reply from server
*\li 10 Internal error
*/
int exitcode = 0;
int fatalexit = 0;
char keynametext[MXNAME];
char keyfile[MXNAME] = "";
char keysecret[MXNAME] = "";
unsigned char cookie_secret[33];
unsigned char cookie[8];
dns_name_t *hmacname = NULL;
unsigned int digestbits = 0;
isc_buffer_t *namebuf = NULL;
dns_tsigkey_t *key = NULL;
isc_boolean_t validated = ISC_TRUE;
isc_entropy_t *entp = NULL;
isc_mempool_t *commctx = NULL;
isc_boolean_t debugging = ISC_FALSE;
isc_boolean_t debugtiming = ISC_FALSE;
isc_boolean_t memdebugging = ISC_FALSE;
char *progname = NULL;
isc_mutex_t lookup_lock;
dig_lookup_t *current_lookup = NULL;
#ifdef DIG_SIGCHASE
isc_result_t get_trusted_key(void);
dns_rdataset_t * sigchase_scanname(dns_rdatatype_t type,
dns_rdatatype_t covers,
isc_boolean_t *lookedup,
dns_name_t *rdata_name);
dns_rdataset_t * chase_scanname_section(dns_message_t *msg,
dns_name_t *name,
dns_rdatatype_t type,
dns_rdatatype_t covers,
int section);
isc_result_t advanced_rrsearch(dns_rdataset_t **rdataset,
dns_name_t *name,
dns_rdatatype_t type,
dns_rdatatype_t covers,
isc_boolean_t *lookedup);
isc_result_t sigchase_verify_sig_key(dns_name_t *name,
dns_rdataset_t *rdataset,
dst_key_t* dnsseckey,
dns_rdataset_t *sigrdataset);
isc_result_t sigchase_verify_sig(dns_name_t *name,
dns_rdataset_t *rdataset,
dns_rdataset_t *keyrdataset,
dns_rdataset_t *sigrdataset);
isc_result_t sigchase_verify_ds(dns_name_t *name,
dns_rdataset_t *keyrdataset,
dns_rdataset_t *dsrdataset);
void sigchase(dns_message_t *msg);
void print_rdata(dns_rdata_t *rdata, isc_mem_t *mctx);
void print_rdataset(dns_name_t *name, dns_rdataset_t *rdataset);
void dup_name(dns_name_t *source, dns_name_t* target);
void free_name(dns_name_t *name);
void dump_database(void);
void dump_database_section(dns_message_t *msg, int section);
dns_rdataset_t * search_type(dns_name_t *name, dns_rdatatype_t type,
dns_rdatatype_t covers);
isc_result_t contains_trusted_key(dns_name_t *name,
dns_rdataset_t *rdataset,
dns_rdataset_t *sigrdataset);
void print_type(dns_rdatatype_t type);
isc_result_t prove_nx_domain(dns_message_t * msg,
dns_name_t * name,
dns_name_t * rdata_name,
dns_rdataset_t ** rdataset,
dns_rdataset_t ** sigrdataset);
isc_result_t prove_nx_type(dns_message_t * msg, dns_name_t *name,
dns_rdataset_t *nsec,
dns_rdataclass_t class,
dns_rdatatype_t type,
dns_name_t * rdata_name,
dns_rdataset_t ** rdataset,
dns_rdataset_t ** sigrdataset);
isc_result_t prove_nx(dns_message_t * msg, dns_name_t * name,
dns_rdataclass_t class,
dns_rdatatype_t type,
dns_name_t * rdata_name,
dns_rdataset_t ** rdataset,
dns_rdataset_t ** sigrdataset);
static void nameFromString(const char *str, dns_name_t *p_ret);
int inf_name(dns_name_t * name1, dns_name_t * name2);
isc_result_t removetmpkey(const char *file);
void clean_trustedkey(void);
isc_result_t insert_trustedkey(void *arg, dns_name_t *name,
dns_rdataset_t *rdataset);
#if DIG_SIGCHASE_BU
isc_result_t getneededrr(dns_message_t *msg);
void sigchase_bottom_up(dns_message_t *msg);
void sigchase_bu(dns_message_t *msg);
#endif
#if DIG_SIGCHASE_TD
isc_result_t initialization(dns_name_t *name);
isc_result_t prepare_lookup(dns_name_t *name);
isc_result_t grandfather_pb_test(dns_name_t * zone_name,
dns_rdataset_t *sigrdataset);
isc_result_t child_of_zone(dns_name_t *name,
dns_name_t *zone_name,
dns_name_t *child_name);
void sigchase_td(dns_message_t *msg);
#endif
char trustedkey[MXNAME] = "";
dns_rdataset_t *chase_rdataset = NULL;
dns_rdataset_t *chase_sigrdataset = NULL;
dns_rdataset_t *chase_dsrdataset = NULL;
dns_rdataset_t *chase_sigdsrdataset = NULL;
dns_rdataset_t *chase_keyrdataset = NULL;
dns_rdataset_t *chase_sigkeyrdataset = NULL;
dns_rdataset_t *chase_nsrdataset = NULL;
dns_name_t chase_name; /* the query name */
#if DIG_SIGCHASE_TD
/*
* the current name is the parent name when we follow delegation
*/
dns_name_t chase_current_name;
/*
* the child name is used for delegation (NS DS responses in AUTHORITY section)
*/
dns_name_t chase_authority_name;
#endif
#if DIG_SIGCHASE_BU
dns_name_t chase_signame;
#endif
isc_boolean_t chase_siglookedup = ISC_FALSE;
isc_boolean_t chase_keylookedup = ISC_FALSE;
isc_boolean_t chase_sigkeylookedup = ISC_FALSE;
isc_boolean_t chase_dslookedup = ISC_FALSE;
isc_boolean_t chase_sigdslookedup = ISC_FALSE;
#if DIG_SIGCHASE_TD
isc_boolean_t chase_nslookedup = ISC_FALSE;
isc_boolean_t chase_lookedup = ISC_FALSE;
isc_boolean_t delegation_follow = ISC_FALSE;
isc_boolean_t grandfather_pb = ISC_FALSE;
isc_boolean_t have_response = ISC_FALSE;
isc_boolean_t have_delegation_ns = ISC_FALSE;
dns_message_t * error_message = NULL;
#endif
isc_boolean_t dsvalidating = ISC_FALSE;
isc_boolean_t chase_name_dup = ISC_FALSE;
ISC_LIST(dig_message_t) chase_message_list;
ISC_LIST(dig_message_t) chase_message_list2;
#define MAX_TRUSTED_KEY 5
typedef struct struct_trusted_key_list {
dst_key_t * key[MAX_TRUSTED_KEY];
int nb_tk;
} struct_tk_list;
struct_tk_list tk_list = { {NULL, NULL, NULL, NULL, NULL}, 0};
#endif
#define DIG_MAX_ADDRESSES 20
/*%
* Apply and clear locks at the event level in global task.
* Can I get rid of these using shutdown events? XXX
*/
#define LOCK_LOOKUP {\
debug("lock_lookup %s:%d", __FILE__, __LINE__);\
check_result(isc_mutex_lock((&lookup_lock)), "isc_mutex_lock");\
debug("success");\
}
#define UNLOCK_LOOKUP {\
debug("unlock_lookup %s:%d", __FILE__, __LINE__);\
check_result(isc_mutex_unlock((&lookup_lock)),\
"isc_mutex_unlock");\
}
static void
cancel_lookup(dig_lookup_t *lookup);
static void
recv_done(isc_task_t *task, isc_event_t *event);
static void
send_udp(dig_query_t *query);
static void
connect_timeout(isc_task_t *task, isc_event_t *event);
static void
launch_next_query(dig_query_t *query, isc_boolean_t include_question);
static void
check_next_lookup(dig_lookup_t *lookup);
static isc_boolean_t
next_origin(dig_lookup_t *oldlookup);
static void *
mem_alloc(void *arg, size_t size) {
return (isc_mem_get(arg, size));
}
static void
mem_free(void *arg, void *mem, size_t size) {
isc_mem_put(arg, mem, size);
}
char *
next_token(char **stringp, const char *delim) {
char *res;
do {
res = strsep(stringp, delim);
if (res == NULL)
break;
} while (*res == '\0');
return (res);
}
static int
count_dots(char *string) {
char *s;
int i = 0;
s = string;
while (*s != '\0') {
if (*s == '.')
i++;
s++;
}
return (i);
}
static void
hex_dump(isc_buffer_t *b) {
unsigned int len, i;
isc_region_t r;
isc_buffer_usedregion(b, &r);
printf("%d bytes\n", r.length);
for (len = 0; len < r.length; len++) {
printf("%02x ", r.base[len]);
if (len % 16 == 15) {
fputs(" ", stdout);
for (i = len - 15; i <= len; i++) {
if (r.base[i] >= '!' && r.base[i] <= '}')
putchar(r.base[i]);
else
putchar('.');
}
printf("\n");
}
}
if (len % 16 != 0) {
for (i = len; (i % 16) != 0; i++)
fputs(" ", stdout);
fputs(" ", stdout);
for (i = ((len>>4)<<4); i < len; i++) {
if (r.base[i] >= '!' && r.base[i] <= '}')
putchar(r.base[i]);
else
putchar('.');
}
printf("\n");
}
}
/*%
* Append 'len' bytes of 'text' at '*p', failing with
* ISC_R_NOSPACE if that would advance p past 'end'.
*/
static isc_result_t
append(const char *text, int len, char **p, char *end) {
if (len > end - *p)
return (ISC_R_NOSPACE);
memmove(*p, text, len);
*p += len;
return (ISC_R_SUCCESS);
}
static isc_result_t
reverse_octets(const char *in, char **p, char *end) {
char *dot = strchr(in, '.');
int len;
if (dot != NULL) {
isc_result_t result;
result = reverse_octets(dot + 1, p, end);
if (result != ISC_R_SUCCESS)
return (result);
result = append(".", 1, p, end);
if (result != ISC_R_SUCCESS)
return (result);
len = (int)(dot - in);
} else {
len = strlen(in);
}
return (append(in, len, p, end));
}
isc_result_t
get_reverse(char *reverse, size_t len, char *value, isc_boolean_t ip6_int,
isc_boolean_t strict)
{
int r;
isc_result_t result;
isc_netaddr_t addr;
addr.family = AF_INET6;
r = inet_pton(AF_INET6, value, &addr.type.in6);
if (r > 0) {
/* This is a valid IPv6 address. */
dns_fixedname_t fname;
dns_name_t *name;
unsigned int options = 0;
if (ip6_int)
options |= DNS_BYADDROPT_IPV6INT;
dns_fixedname_init(&fname);
name = dns_fixedname_name(&fname);
result = dns_byaddr_createptrname2(&addr, options, name);
if (result != ISC_R_SUCCESS)
return (result);
dns_name_format(name, reverse, (unsigned int)len);
return (ISC_R_SUCCESS);
} else {
/*
* Not a valid IPv6 address. Assume IPv4.
* If 'strict' is not set, construct the
* in-addr.arpa name by blindly reversing
* octets whether or not they look like integers,
* so that this can be used for RFC2317 names
* and such.
*/
char *p = reverse;
char *end = reverse + len;
if (strict && inet_pton(AF_INET, value, &addr.type.in) != 1)
return (DNS_R_BADDOTTEDQUAD);
result = reverse_octets(value, &p, end);
if (result != ISC_R_SUCCESS)
return (result);
/* Append .in-addr.arpa. and a terminating NUL. */
result = append(".in-addr.arpa.", 15, &p, end);
if (result != ISC_R_SUCCESS)
return (result);
return (ISC_R_SUCCESS);
}
}
void
fatal(const char *format, ...) {
va_list args;
fflush(stdout);
fprintf(stderr, "%s: ", progname);
va_start(args, format);
vfprintf(stderr, format, args);
va_end(args);
fprintf(stderr, "\n");
if (exitcode < 10)
exitcode = 10;
if (fatalexit != 0)
exitcode = fatalexit;
exit(exitcode);
}
void
debug(const char *format, ...) {
va_list args;
isc_time_t t;
if (debugging) {
fflush(stdout);
if (debugtiming) {
TIME_NOW(&t);
fprintf(stderr, "%d.%06d: ", isc_time_seconds(&t),
isc_time_nanoseconds(&t) / 1000);
}
va_start(args, format);
vfprintf(stderr, format, args);
va_end(args);
fprintf(stderr, "\n");
}
}
void
check_result(isc_result_t result, const char *msg) {
if (result != ISC_R_SUCCESS) {
fatal("%s: %s", msg, isc_result_totext(result));
}
}
/*%
* Create a server structure, which is part of the lookup structure.
* This is little more than a linked list of servers to query in hopes
* of finding the answer the user is looking for
*/
dig_server_t *
make_server(const char *servname, const char *userarg) {
dig_server_t *srv;
REQUIRE(servname != NULL);
debug("make_server(%s)", servname);
srv = isc_mem_allocate(mctx, sizeof(struct dig_server));
if (srv == NULL)
fatal("memory allocation failure in %s:%d",
__FILE__, __LINE__);
strlcpy(srv->servername, servname, MXNAME);
strlcpy(srv->userarg, userarg, MXNAME);
ISC_LINK_INIT(srv, link);
return (srv);
}
static int
addr2af(int lwresaddrtype)
{
int af = 0;
switch (lwresaddrtype) {
case LWRES_ADDRTYPE_V4:
af = AF_INET;
break;
case LWRES_ADDRTYPE_V6:
af = AF_INET6;
break;
}
return (af);
}
/*%
* Create a copy of the server list from the lwres configuration structure.
* The dest list must have already had ISC_LIST_INIT applied.
*/
static void
copy_server_list(lwres_conf_t *confdata, dig_serverlist_t *dest) {
dig_server_t *newsrv;
char tmp[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") +
sizeof("%4000000000")];
int af;
int i;
debug("copy_server_list()");
for (i = 0; i < confdata->nsnext; i++) {
af = addr2af(confdata->nameservers[i].family);
if (af == AF_INET && !have_ipv4)
continue;
if (af == AF_INET6 && !have_ipv6)
continue;
lwres_net_ntop(af, confdata->nameservers[i].address,
tmp, sizeof(tmp));
if (af == AF_INET6 && confdata->nameservers[i].zone != 0) {
char buf[sizeof("%4000000000")];
snprintf(buf, sizeof(buf), "%%%u",
confdata->nameservers[i].zone);
strlcat(tmp, buf, sizeof(tmp));
}
newsrv = make_server(tmp, tmp);
ISC_LINK_INIT(newsrv, link);
ISC_LIST_ENQUEUE(*dest, newsrv, link);
}
}
void
flush_server_list(void) {
dig_server_t *s, *ps;
debug("flush_server_list()");
s = ISC_LIST_HEAD(server_list);
while (s != NULL) {
ps = s;
s = ISC_LIST_NEXT(s, link);
ISC_LIST_DEQUEUE(server_list, ps, link);
isc_mem_free(mctx, ps);
}
}
void
set_nameserver(char *opt) {
isc_result_t result;
isc_sockaddr_t sockaddrs[DIG_MAX_ADDRESSES];
isc_netaddr_t netaddr;
int count, i;
dig_server_t *srv;
char tmp[ISC_NETADDR_FORMATSIZE];
if (opt == NULL)
return;
result = bind9_getaddresses(opt, 0, sockaddrs,
DIG_MAX_ADDRESSES, &count);
if (result != ISC_R_SUCCESS)
fatal("couldn't get address for '%s': %s",
opt, isc_result_totext(result));
flush_server_list();
for (i = 0; i < count; i++) {
isc_netaddr_fromsockaddr(&netaddr, &sockaddrs[i]);
isc_netaddr_format(&netaddr, tmp, sizeof(tmp));
srv = make_server(tmp, opt);
if (srv == NULL)
fatal("memory allocation failure");
ISC_LIST_APPEND(server_list, srv, link);
}
}
static isc_result_t
add_nameserver(lwres_conf_t *confdata, const char *addr, int af) {
int i = confdata->nsnext;
if (confdata->nsnext >= LWRES_CONFMAXNAMESERVERS)
return (ISC_R_FAILURE);
switch (af) {
case AF_INET:
confdata->nameservers[i].family = LWRES_ADDRTYPE_V4;
confdata->nameservers[i].length = NS_INADDRSZ;
break;
case AF_INET6:
confdata->nameservers[i].family = LWRES_ADDRTYPE_V6;
confdata->nameservers[i].length = NS_IN6ADDRSZ;
break;
default:
return (ISC_R_FAILURE);
}
if (lwres_net_pton(af, addr, &confdata->nameservers[i].address) == 1) {
confdata->nsnext++;
return (ISC_R_SUCCESS);
}
return (ISC_R_FAILURE);
}
/*%
* Produce a cloned server list. The dest list must have already had
* ISC_LIST_INIT applied.
*/
void
clone_server_list(dig_serverlist_t src, dig_serverlist_t *dest) {
dig_server_t *srv, *newsrv;
debug("clone_server_list()");
srv = ISC_LIST_HEAD(src);
while (srv != NULL) {
newsrv = make_server(srv->servername, srv->userarg);
ISC_LINK_INIT(newsrv, link);
ISC_LIST_ENQUEUE(*dest, newsrv, link);
srv = ISC_LIST_NEXT(srv, link);
}
}
/*%
* Create an empty lookup structure, which holds all the information needed
* to get an answer to a user's question. This structure contains two
* linked lists: the server list (servers to query) and the query list
* (outstanding queries which have been made to the listed servers).
*/
dig_lookup_t *
make_empty_lookup(void) {
dig_lookup_t *looknew;
debug("make_empty_lookup()");
INSIST(!free_now);
looknew = isc_mem_allocate(mctx, sizeof(struct dig_lookup));
if (looknew == NULL)
fatal("memory allocation failure in %s:%d",
__FILE__, __LINE__);
looknew->pending = ISC_TRUE;
looknew->textname[0] = 0;
looknew->cmdline[0] = 0;
looknew->rdtype = dns_rdatatype_a;
looknew->qrdtype = dns_rdatatype_a;
looknew->rdclass = dns_rdataclass_in;
looknew->rdtypeset = ISC_FALSE;
looknew->rdclassset = ISC_FALSE;
looknew->sendspace = NULL;
looknew->sendmsg = NULL;
looknew->name = NULL;
looknew->oname = NULL;
looknew->timer = NULL;
looknew->xfr_q = NULL;
looknew->current_query = NULL;
looknew->doing_xfr = ISC_FALSE;
looknew->ixfr_serial = 0;
looknew->trace = ISC_FALSE;
looknew->trace_root = ISC_FALSE;
looknew->identify = ISC_FALSE;
looknew->identify_previous_line = ISC_FALSE;
looknew->ignore = ISC_FALSE;
looknew->servfail_stops = ISC_TRUE;
looknew->besteffort = ISC_TRUE;
looknew->dnssec = ISC_FALSE;
looknew->ednsflags = 0;
looknew->opcode = dns_opcode_query;
looknew->expire = ISC_FALSE;
looknew->nsid = ISC_FALSE;
looknew->header_only = ISC_FALSE;
looknew->sendcookie = ISC_FALSE;
looknew->seenbadcookie = ISC_FALSE;
looknew->badcookie = ISC_TRUE;
#ifdef DIG_SIGCHASE
looknew->sigchase = ISC_FALSE;
#if DIG_SIGCHASE_TD
looknew->do_topdown = ISC_FALSE;
looknew->trace_root_sigchase = ISC_FALSE;
looknew->rdtype_sigchaseset = ISC_FALSE;
looknew->rdtype_sigchase = dns_rdatatype_any;
looknew->qrdtype_sigchase = dns_rdatatype_any;
looknew->rdclass_sigchase = dns_rdataclass_in;
looknew->rdclass_sigchaseset = ISC_FALSE;
#endif
#endif
looknew->udpsize = 0;
looknew->edns = -1;
looknew->recurse = ISC_TRUE;
looknew->aaonly = ISC_FALSE;
looknew->adflag = ISC_FALSE;
looknew->cdflag = ISC_FALSE;
looknew->zflag = ISC_FALSE;
looknew->ns_search_only = ISC_FALSE;
looknew->origin = NULL;
looknew->tsigctx = NULL;
looknew->querysig = NULL;
looknew->retries = tries;
looknew->nsfound = 0;
looknew->tcp_mode = ISC_FALSE;
looknew->tcp_mode_set = ISC_FALSE;
looknew->ip6_int = ISC_FALSE;
looknew->comments = ISC_TRUE;
looknew->stats = ISC_TRUE;
looknew->section_question = ISC_TRUE;
looknew->section_answer = ISC_TRUE;
looknew->section_authority = ISC_TRUE;
looknew->section_additional = ISC_TRUE;
looknew->new_search = ISC_FALSE;
looknew->done_as_is = ISC_FALSE;
looknew->need_search = ISC_FALSE;
looknew->ecs_addr = NULL;
looknew->cookie = NULL;
looknew->ednsopts = NULL;
looknew->ednsoptscnt = 0;
looknew->ednsneg = ISC_TRUE;
looknew->dscp = -1;
dns_fixedname_init(&looknew->fdomain);
ISC_LINK_INIT(looknew, link);
ISC_LIST_INIT(looknew->q);
ISC_LIST_INIT(looknew->connecting);
ISC_LIST_INIT(looknew->my_server_list);
return (looknew);
}
/*%
* Clone a lookup, perhaps copying the server list. This does not clone
* the query list, since it will be regenerated by the setup_lookup()
* function, nor does it queue up the new lookup for processing.
* Caution: If you don't clone the servers, you MUST clone the server
* list separately from somewhere else, or construct it by hand.
*/
dig_lookup_t *
clone_lookup(dig_lookup_t *lookold, isc_boolean_t servers) {
dig_lookup_t *looknew;
debug("clone_lookup()");
INSIST(!free_now);
looknew = make_empty_lookup();
INSIST(looknew != NULL);
strlcpy(looknew->textname, lookold->textname, MXNAME);
#if DIG_SIGCHASE_TD
strlcpy(looknew->textnamesigchase, lookold->textnamesigchase, MXNAME);
#endif
strlcpy(looknew->cmdline, lookold->cmdline, MXNAME);
looknew->textname[MXNAME-1] = 0;
looknew->rdtype = lookold->rdtype;
looknew->qrdtype = lookold->qrdtype;
looknew->rdclass = lookold->rdclass;
looknew->rdtypeset = lookold->rdtypeset;
looknew->rdclassset = lookold->rdclassset;
looknew->doing_xfr = lookold->doing_xfr;
looknew->ixfr_serial = lookold->ixfr_serial;
looknew->trace = lookold->trace;
looknew->trace_root = lookold->trace_root;
looknew->identify = lookold->identify;
looknew->identify_previous_line = lookold->identify_previous_line;
looknew->ignore = lookold->ignore;
looknew->servfail_stops = lookold->servfail_stops;
looknew->besteffort = lookold->besteffort;
looknew->dnssec = lookold->dnssec;
looknew->ednsflags = lookold->ednsflags;
looknew->opcode = lookold->opcode;
looknew->expire = lookold->expire;
looknew->nsid = lookold->nsid;
looknew->header_only = lookold->header_only;
looknew->sendcookie = lookold->sendcookie;
looknew->seenbadcookie = lookold->seenbadcookie;
looknew->badcookie = lookold->badcookie;
looknew->cookie = lookold->cookie;
looknew->ednsopts = lookold->ednsopts;
looknew->ednsoptscnt = lookold->ednsoptscnt;
looknew->ednsneg = lookold->ednsneg;
#ifdef DIG_SIGCHASE
looknew->sigchase = lookold->sigchase;
#if DIG_SIGCHASE_TD
looknew->do_topdown = lookold->do_topdown;
looknew->trace_root_sigchase = lookold->trace_root_sigchase;
looknew->rdtype_sigchaseset = lookold->rdtype_sigchaseset;
looknew->rdtype_sigchase = lookold->rdtype_sigchase;
looknew->qrdtype_sigchase = lookold->qrdtype_sigchase;
looknew->rdclass_sigchase = lookold->rdclass_sigchase;
looknew->rdclass_sigchaseset = lookold->rdclass_sigchaseset;
#endif
#endif
looknew->udpsize = lookold->udpsize;
looknew->edns = lookold->edns;
looknew->recurse = lookold->recurse;
looknew->aaonly = lookold->aaonly;
looknew->adflag = lookold->adflag;
looknew->cdflag = lookold->cdflag;
looknew->zflag = lookold->zflag;
looknew->ns_search_only = lookold->ns_search_only;
looknew->tcp_mode = lookold->tcp_mode;
looknew->tcp_mode_set = lookold->tcp_mode_set;
looknew->comments = lookold->comments;
looknew->stats = lookold->stats;
looknew->section_question = lookold->section_question;
looknew->section_answer = lookold->section_answer;
looknew->section_authority = lookold->section_authority;
looknew->section_additional = lookold->section_additional;
looknew->retries = lookold->retries;
looknew->tsigctx = NULL;
looknew->need_search = lookold->need_search;
looknew->done_as_is = lookold->done_as_is;
looknew->dscp = lookold->dscp;
if (lookold->ecs_addr != NULL) {
size_t len = sizeof(isc_sockaddr_t);
looknew->ecs_addr = isc_mem_allocate(mctx, len);
if (looknew->ecs_addr == NULL)
fatal("out of memory");
memmove(looknew->ecs_addr, lookold->ecs_addr, len);
}
dns_name_copy(dns_fixedname_name(&lookold->fdomain),
dns_fixedname_name(&looknew->fdomain), NULL);
if (servers)
clone_server_list(lookold->my_server_list,
&looknew->my_server_list);
return (looknew);
}
/*%
* Requeue a lookup for further processing, perhaps copying the server
* list. The new lookup structure is returned to the caller, and is
* queued for processing. If servers are not cloned in the requeue, they
* must be added before allowing the current event to complete, since the
* completion of the event may result in the next entry on the lookup
* queue getting run.
*/
dig_lookup_t *
requeue_lookup(dig_lookup_t *lookold, isc_boolean_t servers) {
dig_lookup_t *looknew;
debug("requeue_lookup()");
lookup_counter++;
if (lookup_counter > LOOKUP_LIMIT)
fatal("too many lookups");
looknew = clone_lookup(lookold, servers);
INSIST(looknew != NULL);
debug("before insertion, init@%p -> %p, new@%p -> %p",
lookold, lookold->link.next, looknew, looknew->link.next);
ISC_LIST_PREPEND(lookup_list, looknew, link);
debug("after insertion, init -> %p, new = %p, new -> %p",
lookold, looknew, looknew->link.next);
return (looknew);
}
void
setup_text_key(void) {
isc_result_t result;
dns_name_t keyname;
isc_buffer_t secretbuf;
int secretsize;
unsigned char *secretstore;
debug("setup_text_key()");
result = isc_buffer_allocate(mctx, &namebuf, MXNAME);
check_result(result, "isc_buffer_allocate");
dns_name_init(&keyname, NULL);
check_result(result, "dns_name_init");
isc_buffer_putstr(namebuf, keynametext);
secretsize = strlen(keysecret) * 3 / 4;
secretstore = isc_mem_allocate(mctx, secretsize);
if (secretstore == NULL)
fatal("memory allocation failure in %s:%d",
__FILE__, __LINE__);
isc_buffer_init(&secretbuf, secretstore, secretsize);
result = isc_base64_decodestring(keysecret, &secretbuf);
if (result != ISC_R_SUCCESS)
goto failure;
secretsize = isc_buffer_usedlength(&secretbuf);
if (hmacname == NULL) {
result = DST_R_UNSUPPORTEDALG;
goto failure;
}
result = dns_name_fromtext(&keyname, namebuf, dns_rootname, 0, namebuf);
if (result != ISC_R_SUCCESS)
goto failure;
result = dns_tsigkey_create(&keyname, hmacname, secretstore,
secretsize, ISC_FALSE, NULL, 0, 0, mctx,
NULL, &key);
failure:
if (result != ISC_R_SUCCESS)
printf(";; Couldn't create key %s: %s\n",
keynametext, isc_result_totext(result));
else
dst_key_setbits(key->key, digestbits);
isc_mem_free(mctx, secretstore);
dns_name_invalidate(&keyname);
isc_buffer_free(&namebuf);
}
static isc_result_t
parse_uint_helper(isc_uint32_t *uip, const char *value, isc_uint32_t max,
const char *desc, int base) {
isc_uint32_t n;
isc_result_t result = isc_parse_uint32(&n, value, base);
if (result == ISC_R_SUCCESS && n > max)
result = ISC_R_RANGE;
if (result != ISC_R_SUCCESS) {
printf("invalid %s '%s': %s\n", desc,
value, isc_result_totext(result));
return (result);
}
*uip = n;
return (ISC_R_SUCCESS);
}
isc_result_t
parse_uint(isc_uint32_t *uip, const char *value, isc_uint32_t max,
const char *desc) {
return (parse_uint_helper(uip, value, max, desc, 10));
}
isc_result_t
parse_xint(isc_uint32_t *uip, const char *value, isc_uint32_t max,
const char *desc) {
return (parse_uint_helper(uip, value, max, desc, 0));
}
static isc_uint32_t
parse_bits(char *arg, const char *desc, isc_uint32_t max) {
isc_result_t result;
isc_uint32_t tmp;
result = parse_uint(&tmp, arg, max, desc);
if (result != ISC_R_SUCCESS)
fatal("couldn't parse digest bits");
tmp = (tmp + 7) & ~0x7U;
return (tmp);
}
isc_result_t
parse_netprefix(isc_sockaddr_t **sap, const char *value) {
isc_result_t result = ISC_R_SUCCESS;
isc_sockaddr_t *sa = NULL;
struct in_addr in4;
struct in6_addr in6;
isc_uint32_t netmask = 0;
char *slash = NULL;
isc_boolean_t parsed = ISC_FALSE;
if ((slash = strchr(value, '/'))) {
*slash = '\0';
result = isc_parse_uint32(&netmask, slash + 1, 10);
if (result != ISC_R_SUCCESS) {
*slash = '/';
fatal("invalid prefix length '%s': %s\n",
value, isc_result_totext(result));
}
}
sa = isc_mem_allocate(mctx, sizeof(*sa));
if (sa == NULL)
fatal("out of memory");
if (inet_pton(AF_INET6, value, &in6) == 1) {
isc_sockaddr_fromin6(sa, &in6, 0);
parsed = ISC_TRUE;
if (netmask == 0 || netmask > 128)
netmask = 128;
} else if (inet_pton(AF_INET, value, &in4) == 1) {
parsed = ISC_TRUE;
isc_sockaddr_fromin(sa, &in4, 0);
if (netmask == 0 || netmask > 32)
netmask = 32;
} else if (netmask != 0) {
char buf[64];
int i;
strlcpy(buf, value, sizeof(buf));
for (i = 0; i < 3; i++) {
strlcat(buf, ".0", sizeof(buf));
if (inet_pton(AF_INET, buf, &in4) == 1) {
parsed = ISC_TRUE;
isc_sockaddr_fromin(sa, &in4, 0);
break;
}
}
}
if (slash != NULL)
*slash = '/';
if (!parsed)
fatal("invalid address '%s'", value);
sa->length = netmask;
*sap = sa;
return (ISC_R_SUCCESS);
}
/*
* Parse HMAC algorithm specification
*/
void
parse_hmac(const char *hmac) {
char buf[20];
int len;
REQUIRE(hmac != NULL);
len = strlen(hmac);
if (len >= (int) sizeof(buf))
fatal("unknown key type '%.*s'", len, hmac);
strlcpy(buf, hmac, sizeof(buf));
digestbits = 0;
if (strcasecmp(buf, "hmac-md5") == 0) {
hmacname = DNS_TSIG_HMACMD5_NAME;
} else if (strncasecmp(buf, "hmac-md5-", 9) == 0) {
hmacname = DNS_TSIG_HMACMD5_NAME;
digestbits = parse_bits(&buf[9], "digest-bits [0..128]", 128);
} else if (strcasecmp(buf, "hmac-sha1") == 0) {
hmacname = DNS_TSIG_HMACSHA1_NAME;
digestbits = 0;
} else if (strncasecmp(buf, "hmac-sha1-", 10) == 0) {
hmacname = DNS_TSIG_HMACSHA1_NAME;
digestbits = parse_bits(&buf[10], "digest-bits [0..160]", 160);
} else if (strcasecmp(buf, "hmac-sha224") == 0) {
hmacname = DNS_TSIG_HMACSHA224_NAME;
} else if (strncasecmp(buf, "hmac-sha224-", 12) == 0) {
hmacname = DNS_TSIG_HMACSHA224_NAME;
digestbits = parse_bits(&buf[12], "digest-bits [0..224]", 224);
} else if (strcasecmp(buf, "hmac-sha256") == 0) {
hmacname = DNS_TSIG_HMACSHA256_NAME;
} else if (strncasecmp(buf, "hmac-sha256-", 12) == 0) {
hmacname = DNS_TSIG_HMACSHA256_NAME;
digestbits = parse_bits(&buf[12], "digest-bits [0..256]", 256);
} else if (strcasecmp(buf, "hmac-sha384") == 0) {
hmacname = DNS_TSIG_HMACSHA384_NAME;
} else if (strncasecmp(buf, "hmac-sha384-", 12) == 0) {
hmacname = DNS_TSIG_HMACSHA384_NAME;
digestbits = parse_bits(&buf[12], "digest-bits [0..384]", 384);
} else if (strcasecmp(buf, "hmac-sha512") == 0) {
hmacname = DNS_TSIG_HMACSHA512_NAME;
} else if (strncasecmp(buf, "hmac-sha512-", 12) == 0) {
hmacname = DNS_TSIG_HMACSHA512_NAME;
digestbits = parse_bits(&buf[12], "digest-bits [0..512]", 512);
} else {
fprintf(stderr, ";; Warning, ignoring "
"invalid TSIG algorithm %s\n", buf);
}
}
/*
* Get a key from a named.conf format keyfile
*/
static isc_result_t
read_confkey(void) {
cfg_parser_t *pctx = NULL;
cfg_obj_t *file = NULL;
const cfg_obj_t *keyobj = NULL;
const cfg_obj_t *secretobj = NULL;
const cfg_obj_t *algorithmobj = NULL;
const char *keyname;
const char *secretstr;
const char *algorithm;
isc_result_t result;
if (! isc_file_exists(keyfile))
return (ISC_R_FILENOTFOUND);
result = cfg_parser_create(mctx, NULL, &pctx);
if (result != ISC_R_SUCCESS)
goto cleanup;
result = cfg_parse_file(pctx, keyfile, &cfg_type_sessionkey,
&file);
if (result != ISC_R_SUCCESS)
goto cleanup;
result = cfg_map_get(file, "key", &keyobj);
if (result != ISC_R_SUCCESS)
goto cleanup;
(void) cfg_map_get(keyobj, "secret", &secretobj);
(void) cfg_map_get(keyobj, "algorithm", &algorithmobj);
if (secretobj == NULL || algorithmobj == NULL)
fatal("key must have algorithm and secret");
keyname = cfg_obj_asstring(cfg_map_getname(keyobj));
secretstr = cfg_obj_asstring(secretobj);
algorithm = cfg_obj_asstring(algorithmobj);
strlcpy(keynametext, keyname, sizeof(keynametext));
strlcpy(keysecret, secretstr, sizeof(keysecret));
parse_hmac(algorithm);
setup_text_key();
cleanup:
if (pctx != NULL) {
if (file != NULL)
cfg_obj_destroy(pctx, &file);
cfg_parser_destroy(&pctx);
}
return (result);
}
void
setup_file_key(void) {
isc_result_t result;
dst_key_t *dstkey = NULL;
debug("setup_file_key()");
/* Try reading the key from a K* pair */
result = dst_key_fromnamedfile(keyfile, NULL,
DST_TYPE_PRIVATE | DST_TYPE_KEY, mctx,
&dstkey);
/* If that didn't work, try reading it as a session.key keyfile */
if (result != ISC_R_SUCCESS) {
result = read_confkey();
if (result == ISC_R_SUCCESS)
return;
}
if (result != ISC_R_SUCCESS) {
fprintf(stderr, "Couldn't read key from %s: %s\n",
keyfile, isc_result_totext(result));
goto failure;
}
switch (dst_key_alg(dstkey)) {
case DST_ALG_HMACMD5:
hmacname = DNS_TSIG_HMACMD5_NAME;
break;
case DST_ALG_HMACSHA1:
hmacname = DNS_TSIG_HMACSHA1_NAME;
break;
case DST_ALG_HMACSHA224:
hmacname = DNS_TSIG_HMACSHA224_NAME;
break;
case DST_ALG_HMACSHA256:
hmacname = DNS_TSIG_HMACSHA256_NAME;
break;
case DST_ALG_HMACSHA384:
hmacname = DNS_TSIG_HMACSHA384_NAME;
break;
case DST_ALG_HMACSHA512:
hmacname = DNS_TSIG_HMACSHA512_NAME;
break;
default:
printf(";; Couldn't create key %s: bad algorithm\n",
keynametext);
goto failure;
}
result = dns_tsigkey_createfromkey(dst_key_name(dstkey), hmacname,
dstkey, ISC_FALSE, NULL, 0, 0,
mctx, NULL, &key);
if (result != ISC_R_SUCCESS) {
printf(";; Couldn't create key %s: %s\n",
keynametext, isc_result_totext(result));
goto failure;
}
failure:
if (dstkey != NULL)
dst_key_free(&dstkey);
}
static dig_searchlist_t *
make_searchlist_entry(char *domain) {
dig_searchlist_t *search;
search = isc_mem_allocate(mctx, sizeof(*search));
if (search == NULL)
fatal("memory allocation failure in %s:%d",
__FILE__, __LINE__);
strlcpy(search->origin, domain, MXNAME);
search->origin[MXNAME-1] = 0;
ISC_LINK_INIT(search, link);
return (search);
}
static void
clear_searchlist(void) {
dig_searchlist_t *search;
while ((search = ISC_LIST_HEAD(search_list)) != NULL) {
ISC_LIST_UNLINK(search_list, search, link);
isc_mem_free(mctx, search);
}
}
static void
create_search_list(lwres_conf_t *confdata) {
int i;
dig_searchlist_t *search;
debug("create_search_list()");
clear_searchlist();
for (i = 0; i < confdata->searchnxt; i++) {
search = make_searchlist_entry(confdata->search[i]);
ISC_LIST_APPEND(search_list, search, link);
}
}
/*%
* Setup the system as a whole, reading key information and resolv.conf
* settings.
*/
void
setup_system(isc_boolean_t ipv4only, isc_boolean_t ipv6only) {
dig_searchlist_t *domain = NULL;
lwres_result_t lwresult;
unsigned int lwresflags;
isc_result_t result;
debug("setup_system()");
if (ipv4only) {
if (have_ipv4) {
isc_net_disableipv6();
have_ipv6 = ISC_FALSE;
} else {
fatal("can't find IPv4 networking");
}
}
if (ipv6only) {
if (have_ipv6) {
isc_net_disableipv4();
have_ipv4 = ISC_FALSE;
} else {
fatal("can't find IPv6 networking");
}
}
lwresflags = LWRES_CONTEXT_SERVERMODE;
if (have_ipv4)
lwresflags |= LWRES_CONTEXT_USEIPV4;
if (have_ipv6)
lwresflags |= LWRES_CONTEXT_USEIPV6;
lwresult = lwres_context_create(&lwctx, mctx, mem_alloc, mem_free,
lwresflags);
if (lwresult != LWRES_R_SUCCESS)
fatal("lwres_context_create failed");
lwresult = lwres_conf_parse(lwctx, RESOLV_CONF);
if (lwresult != LWRES_R_SUCCESS && lwresult != LWRES_R_NOTFOUND)
fatal("parse of %s failed", RESOLV_CONF);
lwconf = lwres_conf_get(lwctx);
/* Make the search list */
if (lwconf->searchnxt > 0)
create_search_list(lwconf);
else { /* No search list. Use the domain name if any */
if (lwconf->domainname != NULL) {
domain = make_searchlist_entry(lwconf->domainname);
ISC_LIST_APPEND(search_list, domain, link);
domain = NULL;
}
}
if (lwconf->resdebug) {
verbose = ISC_TRUE;
debug("verbose is on");
}
if (ndots == -1) {
ndots = lwconf->ndots;
debug("ndots is %d.", ndots);
}
if (lwconf->attempts) {
tries = lwconf->attempts + 1;
if (tries < 2)
tries = 2;
debug("tries is %d.", tries);
}
if (lwconf->timeout) {
timeout = lwconf->timeout;
debug("timeout is %d.", timeout);
}
/* If user doesn't specify server use nameservers from resolv.conf. */
if (ISC_LIST_EMPTY(server_list))
copy_server_list(lwconf, &server_list);
/* If we don't find a nameserver fall back to localhost */
if (ISC_LIST_EMPTY(server_list)) {
if (have_ipv4) {
lwresult = add_nameserver(lwconf, "127.0.0.1", AF_INET);
if (lwresult != ISC_R_SUCCESS)
fatal("add_nameserver failed");
}
if (have_ipv6) {
lwresult = add_nameserver(lwconf, "::1", AF_INET6);
if (lwresult != ISC_R_SUCCESS)
fatal("add_nameserver failed");
}
copy_server_list(lwconf, &server_list);
}
#ifdef WITH_IDN
initialize_idn();
#endif
if (keyfile[0] != 0)
setup_file_key();
else if (keysecret[0] != 0)
setup_text_key();
#ifdef DIG_SIGCHASE
/* Setup the list of messages for +sigchase */
ISC_LIST_INIT(chase_message_list);
ISC_LIST_INIT(chase_message_list2);
dns_name_init(&chase_name, NULL);
#if DIG_SIGCHASE_TD
dns_name_init(&chase_current_name, NULL);
dns_name_init(&chase_authority_name, NULL);
#endif
#if DIG_SIGCHASE_BU
dns_name_init(&chase_signame, NULL);
#endif
#endif
result = isc_entropy_getdata(entp, cookie_secret,
sizeof(cookie_secret), NULL, 0);
if (result != ISC_R_SUCCESS)
fatal("unable to generate cookie secret");
}
/*%
* Override the search list derived from resolv.conf by 'domain'.
*/
void
set_search_domain(char *domain) {
dig_searchlist_t *search;
clear_searchlist();
search = make_searchlist_entry(domain);
ISC_LIST_APPEND(search_list, search, link);
}
/*%
* Setup the ISC and DNS libraries for use by the system.
*/
void
setup_libs(void) {
isc_result_t result;
isc_logconfig_t *logconfig = NULL;
debug("setup_libs()");
#ifdef PKCS11CRYPTO
pk11_result_register();
#endif
dns_result_register();
result = isc_net_probeipv4();
if (result == ISC_R_SUCCESS)
have_ipv4 = ISC_TRUE;
result = isc_net_probeipv6();
if (result == ISC_R_SUCCESS)
have_ipv6 = ISC_TRUE;
if (!have_ipv6 && !have_ipv4)
fatal("can't find either v4 or v6 networking");
result = isc_mem_create(0, 0, &mctx);
check_result(result, "isc_mem_create");
isc_mem_setname(mctx, "dig", NULL);
result = isc_log_create(mctx, &lctx, &logconfig);
check_result(result, "isc_log_create");
isc_log_setcontext(lctx);
dns_log_init(lctx);
dns_log_setcontext(lctx);
result = isc_log_usechannel(logconfig, "default_debug", NULL, NULL);
check_result(result, "isc_log_usechannel");
isc_log_setdebuglevel(lctx, 0);
result = isc_taskmgr_create(mctx, 1, 0, &taskmgr);
check_result(result, "isc_taskmgr_create");
result = isc_task_create(taskmgr, 0, &global_task);
check_result(result, "isc_task_create");
isc_task_setname(global_task, "dig", NULL);
result = isc_timermgr_create(mctx, &timermgr);
check_result(result, "isc_timermgr_create");
result = isc_socketmgr_create(mctx, &socketmgr);
check_result(result, "isc_socketmgr_create");
result = isc_entropy_create(mctx, &entp);
check_result(result, "isc_entropy_create");
result = dst_lib_init(mctx, entp, 0);
check_result(result, "dst_lib_init");
is_dst_up = ISC_TRUE;
result = isc_mempool_create(mctx, COMMSIZE, &commctx);
check_result(result, "isc_mempool_create");
isc_mempool_setname(commctx, "COMMPOOL");
/*
* 6 and 2 set as reasonable parameters for 3 or 4 nameserver
* systems.
*/
isc_mempool_setfreemax(commctx, 6);
isc_mempool_setfillcount(commctx, 2);
result = isc_mutex_init(&lookup_lock);
check_result(result, "isc_mutex_init");
}
#define EDNSOPTS 100U
static dns_ednsopt_t ednsopts[EDNSOPTS];
static unsigned char ednsoptscnt = 0;
void
save_opt(dig_lookup_t *lookup, char *code, char *value) {
isc_uint32_t num;
isc_buffer_t b;
isc_result_t result;
if (ednsoptscnt == EDNSOPTS)
fatal("too many ednsopts");
result = parse_uint(&num, code, 65535, "ednsopt");
if (result != ISC_R_SUCCESS)
fatal("bad edns code point: %s", code);
ednsopts[ednsoptscnt].code = num;
ednsopts[ednsoptscnt].length = 0;
ednsopts[ednsoptscnt].value = NULL;
if (value != NULL) {
char *buf;
buf = isc_mem_allocate(mctx, strlen(value)/2 + 1);
if (buf == NULL)
fatal("out of memory");
isc_buffer_init(&b, buf, strlen(value)/2 + 1);
result = isc_hex_decodestring(value, &b);
check_result(result, "isc_hex_decodestring");
ednsopts[ednsoptscnt].value = isc_buffer_base(&b);
ednsopts[ednsoptscnt].length = isc_buffer_usedlength(&b);
}
if (lookup->ednsoptscnt == 0)
lookup->ednsopts = &ednsopts[ednsoptscnt];
lookup->ednsoptscnt++;
ednsoptscnt++;
}
/*%
* Add EDNS0 option record to a message. Currently, the only supported
* options are UDP buffer size, the DO bit, and EDNS options
* (e.g., NSID, COOKIE, client-subnet)
*/
static void
add_opt(dns_message_t *msg, isc_uint16_t udpsize, isc_uint16_t edns,
unsigned int flags, dns_ednsopt_t *opts, size_t count)
{
dns_rdataset_t *rdataset = NULL;
isc_result_t result;
debug("add_opt()");
result = dns_message_buildopt(msg, &rdataset, edns, udpsize, flags,
opts, count);
check_result(result, "dns_message_buildopt");
result = dns_message_setopt(msg, rdataset);
check_result(result, "dns_message_setopt");
}
/*%
* Add a question section to a message, asking for the specified name,
* type, and class.
*/
static void
add_question(dns_message_t *message, dns_name_t *name,
dns_rdataclass_t rdclass, dns_rdatatype_t rdtype)
{
dns_rdataset_t *rdataset;
isc_result_t result;
debug("add_question()");
rdataset = NULL;
result = dns_message_gettemprdataset(message, &rdataset);
check_result(result, "dns_message_gettemprdataset()");
dns_rdataset_makequestion(rdataset, rdclass, rdtype);
ISC_LIST_APPEND(name->list, rdataset, link);
}
/*%
* Check if we're done with all the queued lookups, which is true iff
* all sockets, sends, and recvs are accounted for (counters == 0),
* and the lookup list is empty.
* If we are done, pass control back out to dighost_shutdown() (which is
* part of dig.c, host.c, or nslookup.c) to either shutdown the system as
* a whole or reseed the lookup list.
*/
static void
check_if_done(void) {
debug("check_if_done()");
debug("list %s", ISC_LIST_EMPTY(lookup_list) ? "empty" : "full");
if (ISC_LIST_EMPTY(lookup_list) && current_lookup == NULL &&
sendcount == 0) {
INSIST(sockcount == 0);
INSIST(recvcount == 0);
debug("shutting down");
dighost_shutdown();
}
}
/*%
* Clear out a query when we're done with it. WARNING: This routine
* WILL invalidate the query pointer.
*/
static void
clear_query(dig_query_t *query) {
dig_lookup_t *lookup;
REQUIRE(query != NULL);
debug("clear_query(%p)", query);
lookup = query->lookup;
if (lookup->current_query == query)
lookup->current_query = NULL;
if (ISC_LINK_LINKED(query, link))
ISC_LIST_UNLINK(lookup->q, query, link);
if (ISC_LINK_LINKED(query, clink))
ISC_LIST_UNLINK(lookup->connecting, query, clink);
if (ISC_LINK_LINKED(&query->recvbuf, link))
ISC_LIST_DEQUEUE(query->recvlist, &query->recvbuf,
link);
if (ISC_LINK_LINKED(&query->lengthbuf, link))
ISC_LIST_DEQUEUE(query->lengthlist, &query->lengthbuf,
link);
INSIST(query->recvspace != NULL);
if (query->sock != NULL) {
isc_socket_detach(&query->sock);
sockcount--;
debug("sockcount=%d", sockcount);
}
isc_mempool_put(commctx, query->recvspace);
isc_buffer_invalidate(&query->recvbuf);
isc_buffer_invalidate(&query->lengthbuf);
if (query->waiting_senddone)
query->pending_free = ISC_TRUE;
else
isc_mem_free(mctx, query);
}
/*%
* Try and clear out a lookup if we're done with it. Return ISC_TRUE if
* the lookup was successfully cleared. If ISC_TRUE is returned, the
* lookup pointer has been invalidated.
*/
static isc_boolean_t
try_clear_lookup(dig_lookup_t *lookup) {
dig_query_t *q;
REQUIRE(lookup != NULL);
debug("try_clear_lookup(%p)", lookup);
if (ISC_LIST_HEAD(lookup->q) != NULL ||
ISC_LIST_HEAD(lookup->connecting) != NULL)
{
if (debugging) {
q = ISC_LIST_HEAD(lookup->q);
while (q != NULL) {
debug("query to %s still pending", q->servname);
q = ISC_LIST_NEXT(q, link);
}
q = ISC_LIST_HEAD(lookup->connecting);
while (q != NULL) {
debug("query to %s still connecting",
q->servname);
q = ISC_LIST_NEXT(q, clink);
}
}
return (ISC_FALSE);
}
/*
* At this point, we know there are no queries on the lookup,
* so can make it go away also.
*/
destroy_lookup(lookup);
return (ISC_TRUE);
}
void
destroy_lookup(dig_lookup_t *lookup) {
dig_server_t *s;
void *ptr;
debug("destroy");
s = ISC_LIST_HEAD(lookup->my_server_list);
while (s != NULL) {
debug("freeing server %p belonging to %p", s, lookup);
ptr = s;
s = ISC_LIST_NEXT(s, link);
ISC_LIST_DEQUEUE(lookup->my_server_list,
(dig_server_t *)ptr, link);
isc_mem_free(mctx, ptr);
}
if (lookup->sendmsg != NULL)
dns_message_destroy(&lookup->sendmsg);
if (lookup->querysig != NULL) {
debug("freeing buffer %p", lookup->querysig);
isc_buffer_free(&lookup->querysig);
}
if (lookup->timer != NULL)
isc_timer_detach(&lookup->timer);
if (lookup->sendspace != NULL)
isc_mempool_put(commctx, lookup->sendspace);
if (lookup->tsigctx != NULL)
dst_context_destroy(&lookup->tsigctx);
if (lookup->ecs_addr != NULL)
isc_mem_free(mctx, lookup->ecs_addr);
isc_mem_free(mctx, lookup);
}
/*%
* If we can, start the next lookup in the queue running.
* This assumes that the lookup on the head of the queue hasn't been
* started yet. It also removes the lookup from the head of the queue,
* setting the current_lookup pointer pointing to it.
*/
void
start_lookup(void) {
debug("start_lookup()");
if (cancel_now)
return;
/*
* If there's a current lookup running, we really shouldn't get
* here.
*/
INSIST(current_lookup == NULL);
current_lookup = ISC_LIST_HEAD(lookup_list);
/*
* Put the current lookup somewhere so cancel_all can find it
*/
if (current_lookup != NULL) {
ISC_LIST_DEQUEUE(lookup_list, current_lookup, link);
#if DIG_SIGCHASE_TD
if (current_lookup->do_topdown &&
!current_lookup->rdtype_sigchaseset) {
dst_key_t *dstkey = NULL;
isc_buffer_t *b = NULL;
isc_region_t r;
isc_result_t result;
dns_name_t query_name;
dns_name_t *key_name;
int i;
result = get_trusted_key();
if (result != ISC_R_SUCCESS) {
printf("\n;; No trusted key, "
"+sigchase option is disabled\n");
current_lookup->sigchase = ISC_FALSE;
goto novalidation;
}
dns_name_init(&query_name, NULL);
nameFromString(current_lookup->textname, &query_name);
for (i = 0; i < tk_list.nb_tk; i++) {
key_name = dst_key_name(tk_list.key[i]);
if (dns_name_issubdomain(&query_name,
key_name) == ISC_TRUE)
dstkey = tk_list.key[i];
/*
* Verify temp is really the lowest
* WARNING
*/
}
if (dstkey == NULL) {
printf("\n;; The queried zone: ");
dns_name_print(&query_name, stdout);
printf(" isn't a subdomain of any Trusted Keys"
": +sigchase option is disable\n");
current_lookup->sigchase = ISC_FALSE;
free_name(&query_name);
goto novalidation;
}
free_name(&query_name);
current_lookup->rdtype_sigchase
= current_lookup->rdtype;
current_lookup->rdtype_sigchaseset
= current_lookup->rdtypeset;
current_lookup->rdtype = dns_rdatatype_ns;
current_lookup->qrdtype_sigchase
= current_lookup->qrdtype;
current_lookup->qrdtype = dns_rdatatype_ns;
current_lookup->rdclass_sigchase
= current_lookup->rdclass;
current_lookup->rdclass_sigchaseset
= current_lookup->rdclassset;
current_lookup->rdclass = dns_rdataclass_in;
strlcpy(current_lookup->textnamesigchase,
current_lookup->textname, MXNAME);
current_lookup->trace_root_sigchase = ISC_TRUE;
result = isc_buffer_allocate(mctx, &b, BUFSIZE);
check_result(result, "isc_buffer_allocate");
result = dns_name_totext(dst_key_name(dstkey),
ISC_FALSE, b);
check_result(result, "dns_name_totext");
isc_buffer_usedregion(b, &r);
r.base[r.length] = '\0';
strlcpy(current_lookup->textname, (char*)r.base,
MXNAME);
isc_buffer_free(&b);
nameFromString(current_lookup->textnamesigchase,
&chase_name);
dns_name_init(&chase_authority_name, NULL);
}
novalidation:
#endif
if (setup_lookup(current_lookup))
do_lookup(current_lookup);
else if (next_origin(current_lookup))
check_next_lookup(current_lookup);
} else {
check_if_done();
}
}
/*%
* If we can, clear the current lookup and start the next one running.
* This calls try_clear_lookup, so may invalidate the lookup pointer.
*/
static void
check_next_lookup(dig_lookup_t *lookup) {
INSIST(!free_now);
debug("check_next_lookup(%p)", lookup);
if (ISC_LIST_HEAD(lookup->q) != NULL) {
debug("still have a worker");
return;
}
if (try_clear_lookup(lookup)) {
current_lookup = NULL;
start_lookup();
}
}
/*%
* Create and queue a new lookup as a followup to the current lookup,
* based on the supplied message and section. This is used in trace and
* name server search modes to start a new lookup using servers from
* NS records in a reply. Returns the number of followup lookups made.
*/
static int
followup_lookup(dns_message_t *msg, dig_query_t *query, dns_section_t section)
{
dig_lookup_t *lookup = NULL;
dig_server_t *srv = NULL;
dns_rdataset_t *rdataset = NULL;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_name_t *name = NULL;
isc_result_t result;
isc_boolean_t success = ISC_FALSE;
int numLookups = 0;
int num;
isc_result_t lresult, addresses_result;
char bad_namestr[DNS_NAME_FORMATSIZE];
dns_name_t *domain;
isc_boolean_t horizontal = ISC_FALSE, bad = ISC_FALSE;
INSIST(!free_now);
debug("following up %s", query->lookup->textname);
addresses_result = ISC_R_SUCCESS;
bad_namestr[0] = '\0';
for (result = dns_message_firstname(msg, section);
result == ISC_R_SUCCESS;
result = dns_message_nextname(msg, section)) {
name = NULL;
dns_message_currentname(msg, section, &name);
if (section == DNS_SECTION_AUTHORITY) {
rdataset = NULL;
result = dns_message_findtype(name, dns_rdatatype_soa,
0, &rdataset);
if (result == ISC_R_SUCCESS)
return (0);
}
rdataset = NULL;
result = dns_message_findtype(name, dns_rdatatype_ns, 0,
&rdataset);
if (result != ISC_R_SUCCESS)
continue;
debug("found NS set");
if (query->lookup->trace && !query->lookup->trace_root) {
dns_namereln_t namereln;
unsigned int nlabels;
int order;
domain = dns_fixedname_name(&query->lookup->fdomain);
namereln = dns_name_fullcompare(name, domain,
&order, &nlabels);
if (namereln == dns_namereln_equal) {
if (!horizontal)
printf(";; BAD (HORIZONTAL) REFERRAL\n");
horizontal = ISC_TRUE;
} else if (namereln != dns_namereln_subdomain) {
if (!bad)
printf(";; BAD REFERRAL\n");
bad = ISC_TRUE;
continue;
}
}
for (result = dns_rdataset_first(rdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(rdataset)) {
char namestr[DNS_NAME_FORMATSIZE];
dns_rdata_ns_t ns;
if (query->lookup->trace_root &&
query->lookup->nsfound >= MXSERV)
break;
dns_rdataset_current(rdataset, &rdata);
query->lookup->nsfound++;
result = dns_rdata_tostruct(&rdata, &ns, NULL);
check_result(result, "dns_rdata_tostruct");
dns_name_format(&ns.name, namestr, sizeof(namestr));
dns_rdata_freestruct(&ns);
/* Initialize lookup if we've not yet */
debug("found NS %s", namestr);
if (!success) {
success = ISC_TRUE;
lookup_counter++;
lookup = requeue_lookup(query->lookup,
ISC_FALSE);
cancel_lookup(query->lookup);
lookup->doing_xfr = ISC_FALSE;
if (!lookup->trace_root &&
section == DNS_SECTION_ANSWER)
lookup->trace = ISC_FALSE;
else
lookup->trace = query->lookup->trace;
lookup->ns_search_only =
query->lookup->ns_search_only;
lookup->trace_root = ISC_FALSE;
if (lookup->ns_search_only)
lookup->recurse = ISC_FALSE;
domain = dns_fixedname_name(&lookup->fdomain);
dns_name_copy(name, domain, NULL);
}
debug("adding server %s", namestr);
num = getaddresses(lookup, namestr, &lresult);
if (lresult != ISC_R_SUCCESS) {
printf("couldn't get address for '%s': %s\n",
namestr, isc_result_totext(lresult));
if (addresses_result == ISC_R_SUCCESS) {
addresses_result = lresult;
strcpy(bad_namestr, namestr);
}
}
numLookups += num;
dns_rdata_reset(&rdata);
}
}
if (numLookups == 0 && addresses_result != ISC_R_SUCCESS) {
fatal("couldn't get address for '%s': %s",
bad_namestr, isc_result_totext(result));
}
if (lookup == NULL &&
section == DNS_SECTION_ANSWER &&
(query->lookup->trace || query->lookup->ns_search_only))
return (followup_lookup(msg, query, DNS_SECTION_AUTHORITY));
/*
* Randomize the order the nameserver will be tried.
*/
if (numLookups > 1) {
isc_uint32_t i, j;
dig_serverlist_t my_server_list;
dig_server_t *next;
ISC_LIST_INIT(my_server_list);
i = numLookups;
for (srv = ISC_LIST_HEAD(lookup->my_server_list);
srv != NULL;
srv = ISC_LIST_HEAD(lookup->my_server_list)) {
INSIST(i > 0);
isc_random_get(&j);
j %= i;
next = ISC_LIST_NEXT(srv, link);
while (j-- > 0 && next != NULL) {
srv = next;
next = ISC_LIST_NEXT(srv, link);
}
ISC_LIST_DEQUEUE(lookup->my_server_list, srv, link);
ISC_LIST_APPEND(my_server_list, srv, link);
i--;
}
ISC_LIST_APPENDLIST(lookup->my_server_list,
my_server_list, link);
}
return (numLookups);
}
/*%
* Create and queue a new lookup using the next origin from the search
* list, read in setup_system().
*
* Return ISC_TRUE iff there was another searchlist entry.
*/
static isc_boolean_t
next_origin(dig_lookup_t *oldlookup) {
dig_lookup_t *newlookup;
dig_searchlist_t *search;
dns_fixedname_t fixed;
dns_name_t *name;
isc_result_t result;
INSIST(!free_now);
debug("next_origin()");
debug("following up %s", oldlookup->textname);
if (!usesearch)
/*
* We're not using a search list, so don't even think
* about finding the next entry.
*/
return (ISC_FALSE);
/*
* Check for a absolute name or ndots being met.
*/
dns_fixedname_init(&fixed);
name = dns_fixedname_name(&fixed);
result = dns_name_fromstring2(name, oldlookup->textname, NULL,
0, NULL);
if (result == ISC_R_SUCCESS &&
(dns_name_isabsolute(name) ||
(int)dns_name_countlabels(name) > ndots))
return (ISC_FALSE);
if (oldlookup->origin == NULL && !oldlookup->need_search)
/*
* Then we just did rootorg; there's nothing left.
*/
return (ISC_FALSE);
if (oldlookup->origin == NULL && oldlookup->need_search) {
newlookup = requeue_lookup(oldlookup, ISC_TRUE);
newlookup->origin = ISC_LIST_HEAD(search_list);
newlookup->need_search = ISC_FALSE;
} else {
search = ISC_LIST_NEXT(oldlookup->origin, link);
if (search == NULL && oldlookup->done_as_is)
return (ISC_FALSE);
newlookup = requeue_lookup(oldlookup, ISC_TRUE);
newlookup->origin = search;
}
cancel_lookup(oldlookup);
return (ISC_TRUE);
}
/*%
* Insert an SOA record into the sendmessage in a lookup. Used for
* creating IXFR queries.
*/
static void
insert_soa(dig_lookup_t *lookup) {
isc_result_t result;
dns_rdata_soa_t soa;
dns_rdata_t *rdata = NULL;
dns_rdatalist_t *rdatalist = NULL;
dns_rdataset_t *rdataset = NULL;
dns_name_t *soaname = NULL;
debug("insert_soa()");
soa.mctx = mctx;
soa.serial = lookup->ixfr_serial;
soa.refresh = 0;
soa.retry = 0;
soa.expire = 0;
soa.minimum = 0;
soa.common.rdclass = lookup->rdclass;
soa.common.rdtype = dns_rdatatype_soa;
dns_name_init(&soa.origin, NULL);
dns_name_init(&soa.contact, NULL);
dns_name_clone(dns_rootname, &soa.origin);
dns_name_clone(dns_rootname, &soa.contact);
isc_buffer_init(&lookup->rdatabuf, lookup->rdatastore,
sizeof(lookup->rdatastore));
result = dns_message_gettemprdata(lookup->sendmsg, &rdata);
check_result(result, "dns_message_gettemprdata");
result = dns_rdata_fromstruct(rdata, lookup->rdclass,
dns_rdatatype_soa, &soa,
&lookup->rdatabuf);
check_result(result, "isc_rdata_fromstruct");
result = dns_message_gettemprdatalist(lookup->sendmsg, &rdatalist);
check_result(result, "dns_message_gettemprdatalist");
result = dns_message_gettemprdataset(lookup->sendmsg, &rdataset);
check_result(result, "dns_message_gettemprdataset");
dns_rdatalist_init(rdatalist);
rdatalist->type = dns_rdatatype_soa;
rdatalist->rdclass = lookup->rdclass;
ISC_LIST_APPEND(rdatalist->rdata, rdata, link);
dns_rdatalist_tordataset(rdatalist, rdataset);
result = dns_message_gettempname(lookup->sendmsg, &soaname);
check_result(result, "dns_message_gettempname");
dns_name_init(soaname, NULL);
dns_name_clone(lookup->name, soaname);
ISC_LIST_INIT(soaname->list);
ISC_LIST_APPEND(soaname->list, rdataset, link);
dns_message_addname(lookup->sendmsg, soaname, DNS_SECTION_AUTHORITY);
}
static void
compute_cookie(unsigned char *clientcookie, size_t len) {
/* XXXMPA need to fix, should be per server. */
INSIST(len >= 8U);
memmove(clientcookie, cookie_secret, 8);
}
/*%
* Setup the supplied lookup structure, making it ready to start sending
* queries to servers. Create and initialize the message to be sent as
* well as the query structures and buffer space for the replies. If the
* server list is empty, clone it from the system default list.
*/
isc_boolean_t
setup_lookup(dig_lookup_t *lookup) {
isc_result_t result;
isc_uint32_t id;
int len;
dig_server_t *serv;
dig_query_t *query;
isc_buffer_t b;
dns_compress_t cctx;
char store[MXNAME];
char ecsbuf[20];
char cookiebuf[256];
#ifdef WITH_IDN
idn_result_t mr;
char utf8_textname[MXNAME], utf8_origin[MXNAME], idn_textname[MXNAME];
#endif
#ifdef WITH_IDN
result = dns_name_settotextfilter(output_filter);
check_result(result, "dns_name_settotextfilter");
#endif
REQUIRE(lookup != NULL);
INSIST(!free_now);
debug("setup_lookup(%p)", lookup);
result = dns_message_create(mctx, DNS_MESSAGE_INTENTRENDER,
&lookup->sendmsg);
check_result(result, "dns_message_create");
if (lookup->new_search) {
debug("resetting lookup counter.");
lookup_counter = 0;
}
if (ISC_LIST_EMPTY(lookup->my_server_list)) {
debug("cloning server list");
clone_server_list(server_list, &lookup->my_server_list);
}
result = dns_message_gettempname(lookup->sendmsg, &lookup->name);
check_result(result, "dns_message_gettempname");
dns_name_init(lookup->name, NULL);
isc_buffer_init(&lookup->namebuf, lookup->namespace,
sizeof(lookup->namespace));
isc_buffer_init(&lookup->onamebuf, lookup->onamespace,
sizeof(lookup->onamespace));
#ifdef WITH_IDN
/*
* We cannot convert `textname' and `origin' separately.
* `textname' doesn't contain TLD, but local mapping needs
* TLD.
*/
mr = idn_encodename(IDN_LOCALCONV | IDN_DELIMMAP, lookup->textname,
utf8_textname, sizeof(utf8_textname));
idn_check_result(mr, "convert textname to UTF-8");
#endif
/*
* If the name has too many dots, force the origin to be NULL
* (which produces an absolute lookup). Otherwise, take the origin
* we have if there's one in the struct already. If it's NULL,
* take the first entry in the searchlist iff either usesearch
* is TRUE or we got a domain line in the resolv.conf file.
*/
if (lookup->new_search) {
#ifdef WITH_IDN
if ((count_dots(utf8_textname) >= ndots) || !usesearch) {
lookup->origin = NULL; /* Force abs lookup */
lookup->done_as_is = ISC_TRUE;
lookup->need_search = usesearch;
} else if (lookup->origin == NULL && usesearch) {
lookup->origin = ISC_LIST_HEAD(search_list);
lookup->need_search = ISC_FALSE;
}
#else
if ((count_dots(lookup->textname) >= ndots) || !usesearch) {
lookup->origin = NULL; /* Force abs lookup */
lookup->done_as_is = ISC_TRUE;
lookup->need_search = usesearch;
} else if (lookup->origin == NULL && usesearch) {
lookup->origin = ISC_LIST_HEAD(search_list);
lookup->need_search = ISC_FALSE;
}
#endif
}
#ifdef WITH_IDN
if (lookup->origin != NULL) {
mr = idn_encodename(IDN_LOCALCONV | IDN_DELIMMAP,
lookup->origin->origin, utf8_origin,
sizeof(utf8_origin));
idn_check_result(mr, "convert origin to UTF-8");
mr = append_textname(utf8_textname, utf8_origin,
sizeof(utf8_textname));
idn_check_result(mr, "append origin to textname");
}
mr = idn_encodename(idnoptions | IDN_LOCALMAP | IDN_NAMEPREP |
IDN_IDNCONV | IDN_LENCHECK, utf8_textname,
idn_textname, sizeof(idn_textname));
idn_check_result(mr, "convert UTF-8 textname to IDN encoding");
#else
if (lookup->origin != NULL) {
debug("trying origin %s", lookup->origin->origin);
result = dns_message_gettempname(lookup->sendmsg,
&lookup->oname);
check_result(result, "dns_message_gettempname");
dns_name_init(lookup->oname, NULL);
/* XXX Helper funct to conv char* to name? */
len = strlen(lookup->origin->origin);
isc_buffer_init(&b, lookup->origin->origin, len);
isc_buffer_add(&b, len);
result = dns_name_fromtext(lookup->oname, &b, dns_rootname,
0, &lookup->onamebuf);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(lookup->sendmsg,
&lookup->name);
dns_message_puttempname(lookup->sendmsg,
&lookup->oname);
fatal("'%s' is not in legal name syntax (%s)",
lookup->origin->origin,
isc_result_totext(result));
}
if (lookup->trace && lookup->trace_root) {
dns_name_clone(dns_rootname, lookup->name);
} else {
dns_fixedname_t fixed;
dns_name_t *name;
dns_fixedname_init(&fixed);
name = dns_fixedname_name(&fixed);
len = strlen(lookup->textname);
isc_buffer_init(&b, lookup->textname, len);
isc_buffer_add(&b, len);
result = dns_name_fromtext(name, &b, NULL, 0, NULL);
if (result == ISC_R_SUCCESS &&
!dns_name_isabsolute(name))
result = dns_name_concatenate(name,
lookup->oname,
lookup->name,
&lookup->namebuf);
else if (result == ISC_R_SUCCESS)
result = dns_name_copy(name, lookup->name,
&lookup->namebuf);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(lookup->sendmsg,
&lookup->name);
dns_message_puttempname(lookup->sendmsg,
&lookup->oname);
if (result == DNS_R_NAMETOOLONG)
return (ISC_FALSE);
fatal("'%s' is not in legal name syntax (%s)",
lookup->textname,
isc_result_totext(result));
}
}
dns_message_puttempname(lookup->sendmsg, &lookup->oname);
} else
#endif
{
debug("using root origin");
if (lookup->trace && lookup->trace_root)
dns_name_clone(dns_rootname, lookup->name);
else {
#ifdef WITH_IDN
len = strlen(idn_textname);
isc_buffer_init(&b, idn_textname, len);
isc_buffer_add(&b, len);
result = dns_name_fromtext(lookup->name, &b,
dns_rootname, 0,
&lookup->namebuf);
#else
len = strlen(lookup->textname);
isc_buffer_init(&b, lookup->textname, len);
isc_buffer_add(&b, len);
result = dns_name_fromtext(lookup->name, &b,
dns_rootname, 0,
&lookup->namebuf);
#endif
}
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(lookup->sendmsg,
&lookup->name);
fatal("'%s' is not a legal name "
"(%s)", lookup->textname,
isc_result_totext(result));
}
}
dns_name_format(lookup->name, store, sizeof(store));
trying(store, lookup);
INSIST(dns_name_isabsolute(lookup->name));
isc_random_get(&id);
lookup->sendmsg->id = (unsigned short)id & 0xFFFF;
lookup->sendmsg->opcode = lookup->opcode;
lookup->msgcounter = 0;
/*
* If this is a trace request, completely disallow recursion, since
* it's meaningless for traces.
*/
if (lookup->trace || (lookup->ns_search_only && !lookup->trace_root))
lookup->recurse = ISC_FALSE;
if (lookup->recurse &&
lookup->rdtype != dns_rdatatype_axfr &&
lookup->rdtype != dns_rdatatype_ixfr) {
debug("recursive query");
lookup->sendmsg->flags |= DNS_MESSAGEFLAG_RD;
}
/* XXX aaflag */
if (lookup->aaonly) {
debug("AA query");
lookup->sendmsg->flags |= DNS_MESSAGEFLAG_AA;
}
if (lookup->adflag) {
debug("AD query");
lookup->sendmsg->flags |= DNS_MESSAGEFLAG_AD;
}
if (lookup->cdflag) {
debug("CD query");
lookup->sendmsg->flags |= DNS_MESSAGEFLAG_CD;
}
if (lookup->zflag) {
debug("Z query");
lookup->sendmsg->flags |= 0x0040U;
}
dns_message_addname(lookup->sendmsg, lookup->name,
DNS_SECTION_QUESTION);
if (lookup->trace && lookup->trace_root) {
lookup->qrdtype = lookup->rdtype;
lookup->rdtype = dns_rdatatype_ns;
}
if ((lookup->rdtype == dns_rdatatype_axfr) ||
(lookup->rdtype == dns_rdatatype_ixfr)) {
/*
* Force TCP mode if we're doing an axfr.
*/
if (lookup->rdtype == dns_rdatatype_axfr) {
lookup->doing_xfr = ISC_TRUE;
lookup->tcp_mode = ISC_TRUE;
} else if (lookup->tcp_mode) {
lookup->doing_xfr = ISC_TRUE;
}
}
if (!lookup->header_only)
add_question(lookup->sendmsg, lookup->name, lookup->rdclass,
lookup->rdtype);
/* add_soa */
if (lookup->rdtype == dns_rdatatype_ixfr)
insert_soa(lookup);
/* XXX Insist this? */
lookup->tsigctx = NULL;
lookup->querysig = NULL;
if (key != NULL) {
debug("initializing keys");
result = dns_message_settsigkey(lookup->sendmsg, key);
check_result(result, "dns_message_settsigkey");
}
lookup->sendspace = isc_mempool_get(commctx);
if (lookup->sendspace == NULL)
fatal("memory allocation failure");
result = dns_compress_init(&cctx, -1, mctx);
check_result(result, "dns_compress_init");
debug("starting to render the message");
isc_buffer_init(&lookup->renderbuf, lookup->sendspace, COMMSIZE);
result = dns_message_renderbegin(lookup->sendmsg, &cctx,
&lookup->renderbuf);
check_result(result, "dns_message_renderbegin");
if (lookup->udpsize > 0 || lookup->dnssec ||
lookup->edns > -1 || lookup->ecs_addr != NULL)
{
dns_ednsopt_t opts[EDNSOPTS + DNS_EDNSOPTIONS];
unsigned int flags;
int i = 0;
if (lookup->udpsize == 0)
lookup->udpsize = 4096;
if (lookup->edns < 0)
lookup->edns = 0;
if (lookup->nsid) {
INSIST(i < DNS_EDNSOPTIONS);
opts[i].code = DNS_OPT_NSID;
opts[i].length = 0;
opts[i].value = NULL;
i++;
}
if (lookup->ecs_addr != NULL) {
isc_uint32_t prefixlen;
struct sockaddr *sa;
struct sockaddr_in *sin;
struct sockaddr_in6 *sin6;
const isc_uint8_t *addr;
size_t addrl;
isc_uint8_t mask;
sa = &lookup->ecs_addr->type.sa;
prefixlen = lookup->ecs_addr->length;
/* Round up prefix len to a multiple of 8 */
addrl = (prefixlen + 7) / 8;
if (prefixlen % 8 == 0)
mask = 0xff;
else
mask = 0xffU << (8 - (prefixlen % 8));
INSIST(i < DNS_EDNSOPTIONS);
opts[i].code = DNS_OPT_CLIENT_SUBNET;
opts[i].length = (isc_uint16_t) addrl + 4;
check_result(result, "isc_buffer_allocate");
isc_buffer_init(&b, ecsbuf, sizeof(ecsbuf));
if (sa->sa_family == AF_INET) {
sin = (struct sockaddr_in *) sa;
addr = (isc_uint8_t *) &sin->sin_addr;
/* family */
isc_buffer_putuint16(&b, 1);
/* source prefix-length */
isc_buffer_putuint8(&b, prefixlen);
/* scope prefix-length */
isc_buffer_putuint8(&b, 0);
/* address */
if (addrl > 0) {
isc_buffer_putmem(&b, addr, addrl - 1);
isc_buffer_putuint8(&b,
(addr[addrl - 1] &
mask));
}
} else {
sin6 = (struct sockaddr_in6 *) sa;
addr = (isc_uint8_t *) &sin6->sin6_addr;
/* family */
isc_buffer_putuint16(&b, 2);
/* source prefix-length */
isc_buffer_putuint8(&b, prefixlen);
/* scope prefix-length */
isc_buffer_putuint8(&b, 0);
/* address */
if (addrl > 0) {
isc_buffer_putmem(&b, addr, addrl - 1);
isc_buffer_putuint8(&b,
(addr[addrl - 1] &
mask));
}
}
opts[i].value = (isc_uint8_t *) ecsbuf;
i++;
}
if (lookup->sendcookie) {
INSIST(i < DNS_EDNSOPTIONS);
opts[i].code = DNS_OPT_COOKIE;
if (lookup->cookie != NULL) {
isc_buffer_init(&b, cookiebuf,
sizeof(cookiebuf));
result = isc_hex_decodestring(lookup->cookie,
&b);
check_result(result, "isc_hex_decodestring");
opts[i].value = isc_buffer_base(&b);
opts[i].length = isc_buffer_usedlength(&b);
} else {
compute_cookie(cookie, sizeof(cookie));
opts[i].length = 8;
opts[i].value = cookie;
}
i++;
}
if (lookup->expire) {
INSIST(i < DNS_EDNSOPTIONS);
opts[i].code = DNS_OPT_EXPIRE;
opts[i].length = 0;
opts[i].value = NULL;
i++;
}
if (lookup->ednsoptscnt != 0) {
memmove(&opts[i], lookup->ednsopts,
sizeof(dns_ednsopt_t) * lookup->ednsoptscnt);
i += lookup->ednsoptscnt;
}
flags = lookup->ednsflags;
flags &= ~DNS_MESSAGEEXTFLAG_DO;
if (lookup->dnssec)
flags |= DNS_MESSAGEEXTFLAG_DO;
add_opt(lookup->sendmsg, lookup->udpsize,
lookup->edns, flags, opts, i);
}
result = dns_message_rendersection(lookup->sendmsg,
DNS_SECTION_QUESTION, 0);
check_result(result, "dns_message_rendersection");
result = dns_message_rendersection(lookup->sendmsg,
DNS_SECTION_AUTHORITY, 0);
check_result(result, "dns_message_rendersection");
result = dns_message_renderend(lookup->sendmsg);
check_result(result, "dns_message_renderend");
debug("done rendering");
dns_compress_invalidate(&cctx);
/*
* Force TCP mode if the request is larger than 512 bytes.
*/
if (isc_buffer_usedlength(&lookup->renderbuf) > 512)
lookup->tcp_mode = ISC_TRUE;
lookup->pending = ISC_FALSE;
for (serv = ISC_LIST_HEAD(lookup->my_server_list);
serv != NULL;
serv = ISC_LIST_NEXT(serv, link)) {
query = isc_mem_allocate(mctx, sizeof(dig_query_t));
if (query == NULL)
fatal("memory allocation failure in %s:%d",
__FILE__, __LINE__);
debug("create query %p linked to lookup %p",
query, lookup);
query->lookup = lookup;
query->waiting_connect = ISC_FALSE;
query->waiting_senddone = ISC_FALSE;
query->pending_free = ISC_FALSE;
query->recv_made = ISC_FALSE;
query->first_pass = ISC_TRUE;
query->first_soa_rcvd = ISC_FALSE;
query->second_rr_rcvd = ISC_FALSE;
query->first_repeat_rcvd = ISC_FALSE;
query->warn_id = ISC_TRUE;
query->first_rr_serial = 0;
query->second_rr_serial = 0;
query->servname = serv->servername;
query->userarg = serv->userarg;
query->rr_count = 0;
query->msg_count = 0;
query->byte_count = 0;
query->ixfr_axfr = ISC_FALSE;
ISC_LIST_INIT(query->recvlist);
ISC_LIST_INIT(query->lengthlist);
query->sock = NULL;
query->recvspace = isc_mempool_get(commctx);
if (query->recvspace == NULL)
fatal("memory allocation failure");
isc_buffer_init(&query->recvbuf, query->recvspace, COMMSIZE);
isc_buffer_init(&query->lengthbuf, query->lengthspace, 2);
isc_buffer_init(&query->slbuf, query->slspace, 2);
query->sendbuf = lookup->renderbuf;
ISC_LINK_INIT(query, clink);
ISC_LINK_INIT(query, link);
ISC_LIST_ENQUEUE(lookup->q, query, link);
}
/* XXX qrflag, print_query, etc... */
if (!ISC_LIST_EMPTY(lookup->q) && qr) {
extrabytes = 0;
printmessage(ISC_LIST_HEAD(lookup->q), lookup->sendmsg,
ISC_TRUE);
if (lookup->stats)
printf(";; QUERY SIZE: %u\n\n",
isc_buffer_usedlength(&lookup->renderbuf));
}
return (ISC_TRUE);
}
/*%
* Event handler for send completion. Track send counter, and clear out
* the query if the send was canceled.
*/
static void
send_done(isc_task_t *_task, isc_event_t *event) {
isc_socketevent_t *sevent = (isc_socketevent_t *)event;
isc_buffer_t *b = NULL;
dig_query_t *query, *next;
dig_lookup_t *l;
REQUIRE(event->ev_type == ISC_SOCKEVENT_SENDDONE);
UNUSED(_task);
LOCK_LOOKUP;
debug("send_done()");
sendcount--;
debug("sendcount=%d", sendcount);
INSIST(sendcount >= 0);
for (b = ISC_LIST_HEAD(sevent->bufferlist);
b != NULL;
b = ISC_LIST_HEAD(sevent->bufferlist)) {
ISC_LIST_DEQUEUE(sevent->bufferlist, b, link);
isc_mem_free(mctx, b);
}
query = event->ev_arg;
query->waiting_senddone = ISC_FALSE;
l = query->lookup;
if (l->ns_search_only && !l->trace_root && !l->tcp_mode) {
debug("sending next, since searching");
next = ISC_LIST_NEXT(query, link);
if (next != NULL)
send_udp(next);
}
isc_event_free(&event);
if (query->pending_free)
isc_mem_free(mctx, query);
check_if_done();
UNLOCK_LOOKUP;
}
/*%
* Cancel a lookup, sending isc_socket_cancel() requests to all outstanding
* IO sockets. The cancel handlers should take care of cleaning up the
* query and lookup structures
*/
static void
cancel_lookup(dig_lookup_t *lookup) {
dig_query_t *query, *next;
debug("cancel_lookup()");
query = ISC_LIST_HEAD(lookup->q);
while (query != NULL) {
next = ISC_LIST_NEXT(query, link);
if (query->sock != NULL) {
isc_socket_cancel(query->sock, global_task,
ISC_SOCKCANCEL_ALL);
check_if_done();
} else {
clear_query(query);
}
query = next;
}
if (lookup->timer != NULL)
isc_timer_detach(&lookup->timer);
lookup->pending = ISC_FALSE;
lookup->retries = 0;
}
static void
bringup_timer(dig_query_t *query, unsigned int default_timeout) {
dig_lookup_t *l;
unsigned int local_timeout;
isc_result_t result;
debug("bringup_timer()");
/*
* If the timer already exists, that means we're calling this
* a second time (for a retry). Don't need to recreate it,
* just reset it.
*/
l = query->lookup;
if (ISC_LIST_NEXT(query, link) != NULL)
local_timeout = SERVER_TIMEOUT;
else {
if (timeout == 0)
local_timeout = default_timeout;
else
local_timeout = timeout;
}
debug("have local timeout of %d", local_timeout);
isc_interval_set(&l->interval, local_timeout, 0);
if (l->timer != NULL)
isc_timer_detach(&l->timer);
result = isc_timer_create(timermgr, isc_timertype_once, NULL,
&l->interval, global_task, connect_timeout,
l, &l->timer);
check_result(result, "isc_timer_create");
}
static void
force_timeout(dig_lookup_t *l, dig_query_t *query) {
isc_event_t *event;
debug("force_timeout ()");
event = isc_event_allocate(mctx, query, ISC_TIMEREVENT_IDLE,
connect_timeout, l,
sizeof(isc_event_t));
if (event == NULL) {
fatal("isc_event_allocate: %s",
isc_result_totext(ISC_R_NOMEMORY));
}
isc_task_send(global_task, &event);
/*
* The timer may have expired if, for example, get_address() takes
* long time and the timer was running on a different thread.
* We need to cancel the possible timeout event not to confuse
* ourselves due to the duplicate events.
*/
if (l->timer != NULL)
isc_timer_detach(&l->timer);
}
static void
connect_done(isc_task_t *task, isc_event_t *event);
/*%
* Unlike send_udp, this can't be called multiple times with the same
* query. When we retry TCP, we requeue the whole lookup, which should
* start anew.
*/
static void
send_tcp_connect(dig_query_t *query) {
isc_result_t result;
dig_query_t *next;
dig_lookup_t *l;
debug("send_tcp_connect(%p)", query);
l = query->lookup;
query->waiting_connect = ISC_TRUE;
query->lookup->current_query = query;
result = get_address(query->servname, port, &query->sockaddr);
if (result != ISC_R_SUCCESS) {
/*
* This servname doesn't have an address. Try the next server
* by triggering an immediate 'timeout' (we lie, but the effect
* is the same).
*/
force_timeout(l, query);
return;
}
if (specified_source &&
(isc_sockaddr_pf(&query->sockaddr) !=
isc_sockaddr_pf(&bind_address))) {
printf(";; Skipping server %s, incompatible "
"address family\n", query->servname);
query->waiting_connect = ISC_FALSE;
next = ISC_LIST_NEXT(query, link);
l = query->lookup;
clear_query(query);
if (next == NULL) {
printf(";; No acceptable nameservers\n");
check_next_lookup(l);
return;
}
send_tcp_connect(next);
return;
}
INSIST(query->sock == NULL);
if (keep != NULL && isc_sockaddr_equal(&keepaddr, &query->sockaddr)) {
sockcount++;
isc_socket_attach(keep, &query->sock);
query->waiting_connect = ISC_FALSE;
launch_next_query(query, ISC_TRUE);
goto search;
}
result = isc_socket_create(socketmgr,
isc_sockaddr_pf(&query->sockaddr),
isc_sockettype_tcp, &query->sock);
check_result(result, "isc_socket_create");
sockcount++;
debug("sockcount=%d", sockcount);
if (query->lookup->dscp != -1)
isc_socket_dscp(query->sock, query->lookup->dscp);
if (specified_source)
result = isc_socket_bind(query->sock, &bind_address,
ISC_SOCKET_REUSEADDRESS);
else {
if ((isc_sockaddr_pf(&query->sockaddr) == AF_INET) &&
have_ipv4)
isc_sockaddr_any(&bind_any);
else
isc_sockaddr_any6(&bind_any);
result = isc_socket_bind(query->sock, &bind_any, 0);
}
check_result(result, "isc_socket_bind");
bringup_timer(query, TCP_TIMEOUT);
result = isc_socket_connect(query->sock, &query->sockaddr,
global_task, connect_done, query);
check_result(result, "isc_socket_connect");
search:
/*
* If we're at the endgame of a nameserver search, we need to
* immediately bring up all the queries. Do it here.
*/
if (l->ns_search_only && !l->trace_root) {
debug("sending next, since searching");
next = ISC_LIST_NEXT(query, link);
if (ISC_LINK_LINKED(query, link))
ISC_LIST_DEQUEUE(l->q, query, link);
ISC_LIST_ENQUEUE(l->connecting, query, clink);
if (next != NULL)
send_tcp_connect(next);
}
}
static isc_buffer_t *
clone_buffer(isc_buffer_t *source) {
isc_buffer_t *buffer;
buffer = isc_mem_allocate(mctx, sizeof(*buffer));
if (buffer == NULL)
fatal("memory allocation failure in %s:%d",
__FILE__, __LINE__);
*buffer = *source;
return (buffer);
}
/*%
* Send a UDP packet to the remote nameserver, possible starting the
* recv action as well. Also make sure that the timer is running and
* is properly reset.
*/
static void
send_udp(dig_query_t *query) {
dig_lookup_t *l = NULL;
isc_result_t result;
isc_buffer_t *sendbuf;
debug("send_udp(%p)", query);
l = query->lookup;
bringup_timer(query, UDP_TIMEOUT);
l->current_query = query;
debug("working on lookup %p, query %p", query->lookup, query);
if (!query->recv_made) {
/* XXX Check the sense of this, need assertion? */
query->waiting_connect = ISC_FALSE;
result = get_address(query->servname, port, &query->sockaddr);
if (result != ISC_R_SUCCESS) {
/* This servname doesn't have an address. */
force_timeout(l, query);
return;
}
result = isc_socket_create(socketmgr,
isc_sockaddr_pf(&query->sockaddr),
isc_sockettype_udp, &query->sock);
check_result(result, "isc_socket_create");
sockcount++;
debug("sockcount=%d", sockcount);
if (query->lookup->dscp != -1)
isc_socket_dscp(query->sock, query->lookup->dscp);
if (specified_source) {
result = isc_socket_bind(query->sock, &bind_address,
ISC_SOCKET_REUSEADDRESS);
} else {
isc_sockaddr_anyofpf(&bind_any,
isc_sockaddr_pf(&query->sockaddr));
result = isc_socket_bind(query->sock, &bind_any, 0);
}
check_result(result, "isc_socket_bind");
query->recv_made = ISC_TRUE;
ISC_LINK_INIT(&query->recvbuf, link);
ISC_LIST_ENQUEUE(query->recvlist, &query->recvbuf,
link);
debug("recving with lookup=%p, query=%p, sock=%p",
query->lookup, query, query->sock);
result = isc_socket_recvv(query->sock, &query->recvlist, 1,
global_task, recv_done, query);
check_result(result, "isc_socket_recvv");
recvcount++;
debug("recvcount=%d", recvcount);
}
ISC_LIST_INIT(query->sendlist);
sendbuf = clone_buffer(&query->sendbuf);
ISC_LIST_ENQUEUE(query->sendlist, sendbuf, link);
debug("sending a request");
TIME_NOW(&query->time_sent);
INSIST(query->sock != NULL);
query->waiting_senddone = ISC_TRUE;
result = isc_socket_sendtov2(query->sock, &query->sendlist,
global_task, send_done, query,
&query->sockaddr, NULL,
ISC_SOCKFLAG_NORETRY);
check_result(result, "isc_socket_sendtov");
sendcount++;
}
/*%
* IO timeout handler, used for both connect and recv timeouts. If
* retries are still allowed, either resend the UDP packet or queue a
* new TCP lookup. Otherwise, cancel the lookup.
*/
static void
connect_timeout(isc_task_t *task, isc_event_t *event) {
dig_lookup_t *l = NULL;
dig_query_t *query = NULL, *next, *cq;
UNUSED(task);
REQUIRE(event->ev_type == ISC_TIMEREVENT_IDLE);
debug("connect_timeout()");
LOCK_LOOKUP;
l = event->ev_arg;
query = l->current_query;
isc_event_free(&event);
INSIST(!free_now);
if ((query != NULL) && (query->lookup->current_query != NULL) &&
(ISC_LIST_NEXT(query->lookup->current_query, link) != NULL)) {
debug("trying next server...");
cq = query->lookup->current_query;
if (!l->tcp_mode)
send_udp(ISC_LIST_NEXT(cq, link));
else {
if (query->sock != NULL)
isc_socket_cancel(query->sock, NULL,
ISC_SOCKCANCEL_ALL);
next = ISC_LIST_NEXT(cq, link);
if (next != NULL)
send_tcp_connect(next);
}
UNLOCK_LOOKUP;
return;
}
if (l->retries > 1) {
if (!l->tcp_mode) {
l->retries--;
debug("resending UDP request to first server");
send_udp(ISC_LIST_HEAD(l->q));
} else {
debug("making new TCP request, %d tries left",
l->retries);
l->retries--;
requeue_lookup(l, ISC_TRUE);
cancel_lookup(l);
check_next_lookup(l);
}
} else {
fputs(l->cmdline, stdout);
printf(";; connection timed out; no servers could be "
"reached\n");
cancel_lookup(l);
check_next_lookup(l);
if (exitcode < 9)
exitcode = 9;
}
UNLOCK_LOOKUP;
}
/*%
* Event handler for the TCP recv which gets the length header of TCP
* packets. Start the next recv of length bytes.
*/
static void
tcp_length_done(isc_task_t *task, isc_event_t *event) {
isc_socketevent_t *sevent;
isc_buffer_t *b = NULL;
isc_result_t result;
dig_query_t *query = NULL;
dig_lookup_t *l;
isc_uint16_t length;
REQUIRE(event->ev_type == ISC_SOCKEVENT_RECVDONE);
INSIST(!free_now);
UNUSED(task);
debug("tcp_length_done()");
LOCK_LOOKUP;
sevent = (isc_socketevent_t *)event;
query = event->ev_arg;
recvcount--;
INSIST(recvcount >= 0);
b = ISC_LIST_HEAD(sevent->bufferlist);
INSIST(b == &query->lengthbuf);
ISC_LIST_DEQUEUE(sevent->bufferlist, b, link);
if (sevent->result == ISC_R_CANCELED) {
isc_event_free(&event);
l = query->lookup;
clear_query(query);
check_next_lookup(l);
UNLOCK_LOOKUP;
return;
}
if (sevent->result != ISC_R_SUCCESS) {
char sockstr[ISC_SOCKADDR_FORMATSIZE];
isc_sockaddr_format(&query->sockaddr, sockstr,
sizeof(sockstr));
printf(";; communications error to %s: %s\n",
sockstr, isc_result_totext(sevent->result));
l = query->lookup;
isc_socket_detach(&query->sock);
sockcount--;
debug("sockcount=%d", sockcount);
INSIST(sockcount >= 0);
isc_event_free(&event);
clear_query(query);
check_next_lookup(l);
UNLOCK_LOOKUP;
return;
}
length = isc_buffer_getuint16(b);
if (length == 0) {
isc_event_free(&event);
launch_next_query(query, ISC_FALSE);
UNLOCK_LOOKUP;
return;
}
/*
* Even though the buffer was already init'ed, we need
* to redo it now, to force the length we want.
*/
isc_buffer_invalidate(&query->recvbuf);
isc_buffer_init(&query->recvbuf, query->recvspace, length);
ENSURE(ISC_LIST_EMPTY(query->recvlist));
ISC_LINK_INIT(&query->recvbuf, link);
ISC_LIST_ENQUEUE(query->recvlist, &query->recvbuf, link);
debug("recving with lookup=%p, query=%p", query->lookup, query);
result = isc_socket_recvv(query->sock, &query->recvlist, length, task,
recv_done, query);
check_result(result, "isc_socket_recvv");
recvcount++;
debug("resubmitted recv request with length %d, recvcount=%d",
length, recvcount);
isc_event_free(&event);
UNLOCK_LOOKUP;
}
/*%
* For transfers that involve multiple recvs (XFR's in particular),
* launch the next recv.
*/
static void
launch_next_query(dig_query_t *query, isc_boolean_t include_question) {
isc_result_t result;
dig_lookup_t *l;
isc_buffer_t *buffer;
INSIST(!free_now);
debug("launch_next_query()");
if (!query->lookup->pending) {
debug("ignoring launch_next_query because !pending");
isc_socket_detach(&query->sock);
sockcount--;
debug("sockcount=%d", sockcount);
INSIST(sockcount >= 0);
query->waiting_connect = ISC_FALSE;
l = query->lookup;
clear_query(query);
check_next_lookup(l);
return;
}
isc_buffer_clear(&query->slbuf);
isc_buffer_clear(&query->lengthbuf);
isc_buffer_putuint16(&query->slbuf, (isc_uint16_t) query->sendbuf.used);
ISC_LIST_INIT(query->sendlist);
ISC_LINK_INIT(&query->slbuf, link);
if (!query->first_soa_rcvd) {
buffer = clone_buffer(&query->slbuf);
ISC_LIST_ENQUEUE(query->sendlist, buffer, link);
if (include_question) {
buffer = clone_buffer(&query->sendbuf);
ISC_LIST_ENQUEUE(query->sendlist, buffer, link);
}
}
ISC_LINK_INIT(&query->lengthbuf, link);
ISC_LIST_ENQUEUE(query->lengthlist, &query->lengthbuf, link);
result = isc_socket_recvv(query->sock, &query->lengthlist, 0,
global_task, tcp_length_done, query);
check_result(result, "isc_socket_recvv");
recvcount++;
debug("recvcount=%d", recvcount);
if (!query->first_soa_rcvd) {
debug("sending a request in launch_next_query");
TIME_NOW(&query->time_sent);
query->waiting_senddone = ISC_TRUE;
result = isc_socket_sendv(query->sock, &query->sendlist,
global_task, send_done, query);
check_result(result, "isc_socket_sendv");
sendcount++;
debug("sendcount=%d", sendcount);
}
query->waiting_connect = ISC_FALSE;
#if 0
check_next_lookup(query->lookup);
#endif
return;
}
/*%
* Event handler for TCP connect complete. Make sure the connection was
* successful, then pass into launch_next_query to actually send the
* question.
*/
static void
connect_done(isc_task_t *task, isc_event_t *event) {
isc_socketevent_t *sevent = NULL;
dig_query_t *query = NULL, *next;
dig_lookup_t *l;
UNUSED(task);
REQUIRE(event->ev_type == ISC_SOCKEVENT_CONNECT);
INSIST(!free_now);
debug("connect_done()");
LOCK_LOOKUP;
sevent = (isc_socketevent_t *)event;
query = sevent->ev_arg;
INSIST(query->waiting_connect);
query->waiting_connect = ISC_FALSE;
if (sevent->result == ISC_R_CANCELED) {
debug("in cancel handler");
isc_socket_detach(&query->sock);
INSIST(sockcount > 0);
sockcount--;
debug("sockcount=%d", sockcount);
query->waiting_connect = ISC_FALSE;
isc_event_free(&event);
l = query->lookup;
clear_query(query);
check_next_lookup(l);
UNLOCK_LOOKUP;
return;
}
if (sevent->result != ISC_R_SUCCESS) {
char sockstr[ISC_SOCKADDR_FORMATSIZE];
debug("unsuccessful connection: %s",
isc_result_totext(sevent->result));
isc_sockaddr_format(&query->sockaddr, sockstr, sizeof(sockstr));
if (sevent->result != ISC_R_CANCELED)
printf(";; Connection to %s(%s) for %s failed: "
"%s.\n", sockstr,
query->servname, query->lookup->textname,
isc_result_totext(sevent->result));
isc_socket_detach(&query->sock);
sockcount--;
INSIST(sockcount >= 0);
/* XXX Clean up exitcodes */
if (exitcode < 9)
exitcode = 9;
debug("sockcount=%d", sockcount);
query->waiting_connect = ISC_FALSE;
isc_event_free(&event);
l = query->lookup;
if ((l->current_query != NULL) &&
(ISC_LINK_LINKED(l->current_query, link)))
next = ISC_LIST_NEXT(l->current_query, link);
else
next = NULL;
clear_query(query);
if (next != NULL) {
bringup_timer(next, TCP_TIMEOUT);
send_tcp_connect(next);
} else
check_next_lookup(l);
UNLOCK_LOOKUP;
return;
}
if (keep_open) {
if (keep != NULL)
isc_socket_detach(&keep);
isc_socket_attach(query->sock, &keep);
keepaddr = query->sockaddr;
}
launch_next_query(query, ISC_TRUE);
isc_event_free(&event);
UNLOCK_LOOKUP;
}
/*%
* Check if the ongoing XFR needs more data before it's complete, using
* the semantics of IXFR and AXFR protocols. Much of the complexity of
* this routine comes from determining when an IXFR is complete.
* ISC_FALSE means more data is on the way, and the recv has been issued.
*/
static isc_boolean_t
check_for_more_data(dig_query_t *query, dns_message_t *msg,
isc_socketevent_t *sevent)
{
dns_rdataset_t *rdataset = NULL;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdata_soa_t soa;
isc_uint32_t ixfr_serial = query->lookup->ixfr_serial, serial;
isc_result_t result;
isc_boolean_t ixfr = query->lookup->rdtype == dns_rdatatype_ixfr;
isc_boolean_t axfr = query->lookup->rdtype == dns_rdatatype_axfr;
if (ixfr)
axfr = query->ixfr_axfr;
debug("check_for_more_data()");
/*
* By the time we're in this routine, we know we're doing
* either an AXFR or IXFR. If there's no second_rr_type,
* then we don't yet know which kind of answer we got back
* from the server. Here, we're going to walk through the
* rr's in the message, acting as necessary whenever we hit
* an SOA rr.
*/
query->msg_count++;
query->byte_count += sevent->n;
result = dns_message_firstname(msg, DNS_SECTION_ANSWER);
if (result != ISC_R_SUCCESS) {
puts("; Transfer failed.");
return (ISC_TRUE);
}
do {
dns_name_t *name;
name = NULL;
dns_message_currentname(msg, DNS_SECTION_ANSWER,
&name);
for (rdataset = ISC_LIST_HEAD(name->list);
rdataset != NULL;
rdataset = ISC_LIST_NEXT(rdataset, link)) {
result = dns_rdataset_first(rdataset);
if (result != ISC_R_SUCCESS)
continue;
do {
query->rr_count++;
dns_rdata_reset(&rdata);
dns_rdataset_current(rdataset, &rdata);
/*
* If this is the first rr, make sure
* it's an SOA
*/
if ((!query->first_soa_rcvd) &&
(rdata.type != dns_rdatatype_soa)) {
puts("; Transfer failed. "
"Didn't start with SOA answer.");
return (ISC_TRUE);
}
if ((!query->second_rr_rcvd) &&
(rdata.type != dns_rdatatype_soa)) {
query->second_rr_rcvd = ISC_TRUE;
query->second_rr_serial = 0;
debug("got the second rr as nonsoa");
axfr = query->ixfr_axfr = ISC_TRUE;
goto next_rdata;
}
/*
* If the record is anything except an SOA
* now, just continue on...
*/
if (rdata.type != dns_rdatatype_soa)
goto next_rdata;
/* Now we have an SOA. Work with it. */
debug("got an SOA");
result = dns_rdata_tostruct(&rdata, &soa, NULL);
check_result(result, "dns_rdata_tostruct");
serial = soa.serial;
dns_rdata_freestruct(&soa);
if (!query->first_soa_rcvd) {
query->first_soa_rcvd = ISC_TRUE;
query->first_rr_serial = serial;
debug("this is the first serial %u",
serial);
if (ixfr && isc_serial_ge(ixfr_serial,
serial)) {
debug("got up to date "
"response");
goto doexit;
}
goto next_rdata;
}
if (axfr) {
debug("doing axfr, got second SOA");
goto doexit;
}
if (!query->second_rr_rcvd) {
if (query->first_rr_serial == serial) {
debug("doing ixfr, got "
"empty zone");
goto doexit;
}
debug("this is the second serial %u",
serial);
query->second_rr_rcvd = ISC_TRUE;
query->second_rr_serial = serial;
goto next_rdata;
}
/*
* If we get to this point, we're doing an
* IXFR and have to start really looking
* at serial numbers.
*/
if (query->first_rr_serial == serial) {
debug("got a match for ixfr");
if (!query->first_repeat_rcvd) {
query->first_repeat_rcvd =
ISC_TRUE;
goto next_rdata;
}
debug("done with ixfr");
goto doexit;
}
debug("meaningless soa %u", serial);
next_rdata:
result = dns_rdataset_next(rdataset);
} while (result == ISC_R_SUCCESS);
}
result = dns_message_nextname(msg, DNS_SECTION_ANSWER);
} while (result == ISC_R_SUCCESS);
launch_next_query(query, ISC_FALSE);
return (ISC_FALSE);
doexit:
received(sevent->n, &sevent->address, query);
return (ISC_TRUE);
}
static void
process_cookie(dig_lookup_t *l, dns_message_t *msg,
isc_buffer_t *optbuf, size_t optlen)
{
char bb[256];
isc_buffer_t hexbuf;
size_t len;
const unsigned char *sent;
isc_boolean_t copy = ISC_TRUE;
isc_result_t result;
if (l->cookie != NULL) {
isc_buffer_init(&hexbuf, bb, sizeof(bb));
result = isc_hex_decodestring(l->cookie, &hexbuf);
check_result(result, "isc_hex_decodestring");
sent = isc_buffer_base(&hexbuf);
len = isc_buffer_usedlength(&hexbuf);
} else {
sent = cookie;
len = sizeof(cookie);
}
INSIST(msg->cc_ok == 0 && msg->cc_bad == 0);
if (optlen >= len && optlen >= 8U) {
if (memcmp(isc_buffer_current(optbuf), sent, 8) == 0) {
msg->cc_ok = 1;
} else {
printf(";; Warning: Client COOKIE mismatch\n");
msg->cc_bad = 1;
copy = ISC_FALSE;
}
} else {
printf(";; Warning: COOKIE bad token (too short)\n");
msg->cc_bad = 1;
copy = ISC_FALSE;
}
if (copy) {
isc_region_t r;
r.base = isc_buffer_current(optbuf);
r.length = (unsigned int)optlen;
isc_buffer_init(&hexbuf, servercookie, sizeof(servercookie));
result = isc_hex_totext(&r, 2, "", &hexbuf);
check_result(result, "isc_hex_totext");
if (isc_buffer_availablelength(&hexbuf) > 0) {
isc_buffer_putuint8(&hexbuf, 0);
l->cookie = servercookie;
}
}
isc_buffer_forward(optbuf, (unsigned int)optlen);
}
static void
process_opt(dig_lookup_t *l, dns_message_t *msg) {
dns_rdata_t rdata;
isc_result_t result;
isc_buffer_t optbuf;
isc_uint16_t optcode, optlen;
dns_rdataset_t *opt = msg->opt;
result = dns_rdataset_first(opt);
if (result == ISC_R_SUCCESS) {
dns_rdata_init(&rdata);
dns_rdataset_current(opt, &rdata);
isc_buffer_init(&optbuf, rdata.data, rdata.length);
isc_buffer_add(&optbuf, rdata.length);
while (isc_buffer_remaininglength(&optbuf) >= 4) {
optcode = isc_buffer_getuint16(&optbuf);
optlen = isc_buffer_getuint16(&optbuf);
switch (optcode) {
case DNS_OPT_COOKIE:
process_cookie(l, msg, &optbuf, optlen);
break;
default:
isc_buffer_forward(&optbuf, optlen);
break;
}
}
}
}
static int
ednsvers(dns_rdataset_t *opt) {
return ((opt->ttl >> 16) & 0xff);
}
/*%
* Event handler for recv complete. Perform whatever actions are necessary,
* based on the specifics of the user's request.
*/
static void
recv_done(isc_task_t *task, isc_event_t *event) {
isc_socketevent_t *sevent = NULL;
dig_query_t *query = NULL;
isc_buffer_t *b = NULL;
dns_message_t *msg = NULL;
#ifdef DIG_SIGCHASE
dig_message_t *chase_msg = NULL;
dig_message_t *chase_msg2 = NULL;
#endif
isc_result_t result;
dig_lookup_t *n, *l;
isc_boolean_t docancel = ISC_FALSE;
isc_boolean_t match = ISC_TRUE;
unsigned int parseflags;
dns_messageid_t id;
unsigned int msgflags;
#ifdef DIG_SIGCHASE
isc_result_t do_sigchase = ISC_FALSE;
dns_message_t *msg_temp = NULL;
isc_region_t r;
isc_buffer_t *buf = NULL;
#endif
int newedns;
UNUSED(task);
INSIST(!free_now);
debug("recv_done()");
LOCK_LOOKUP;
recvcount--;
debug("recvcount=%d", recvcount);
INSIST(recvcount >= 0);
query = event->ev_arg;
TIME_NOW(&query->time_recv);
debug("lookup=%p, query=%p", query->lookup, query);
l = query->lookup;
REQUIRE(event->ev_type == ISC_SOCKEVENT_RECVDONE);
sevent = (isc_socketevent_t *)event;
b = ISC_LIST_HEAD(sevent->bufferlist);
INSIST(b == &query->recvbuf);
ISC_LIST_DEQUEUE(sevent->bufferlist, &query->recvbuf, link);
if ((l->tcp_mode) && (l->timer != NULL))
isc_timer_touch(l->timer);
if ((!l->pending && !l->ns_search_only) || cancel_now) {
debug("no longer pending. Got %s",
isc_result_totext(sevent->result));
query->waiting_connect = ISC_FALSE;
isc_event_free(&event);
clear_query(query);
check_next_lookup(l);
UNLOCK_LOOKUP;
return;
}
if (sevent->result != ISC_R_SUCCESS) {
if (sevent->result == ISC_R_CANCELED) {
debug("in recv cancel handler");
query->waiting_connect = ISC_FALSE;
} else {
printf(";; communications error: %s\n",
isc_result_totext(sevent->result));
isc_socket_detach(&query->sock);
sockcount--;
debug("sockcount=%d", sockcount);
INSIST(sockcount >= 0);
}
isc_event_free(&event);
clear_query(query);
check_next_lookup(l);
UNLOCK_LOOKUP;
return;
}
if (!l->tcp_mode &&
!isc_sockaddr_compare(&sevent->address, &query->sockaddr,
ISC_SOCKADDR_CMPADDR|
ISC_SOCKADDR_CMPPORT|
ISC_SOCKADDR_CMPSCOPE|
ISC_SOCKADDR_CMPSCOPEZERO)) {
char buf1[ISC_SOCKADDR_FORMATSIZE];
char buf2[ISC_SOCKADDR_FORMATSIZE];
isc_sockaddr_t any;
if (isc_sockaddr_pf(&query->sockaddr) == AF_INET)
isc_sockaddr_any(&any);
else
isc_sockaddr_any6(&any);
/*
* We don't expect a match when the packet is
* sent to 0.0.0.0, :: or to a multicast addresses.
* XXXMPA broadcast needs to be handled here as well.
*/
if ((!isc_sockaddr_eqaddr(&query->sockaddr, &any) &&
!isc_sockaddr_ismulticast(&query->sockaddr)) ||
isc_sockaddr_getport(&query->sockaddr) !=
isc_sockaddr_getport(&sevent->address)) {
isc_sockaddr_format(&sevent->address, buf1,
sizeof(buf1));
isc_sockaddr_format(&query->sockaddr, buf2,
sizeof(buf2));
printf(";; reply from unexpected source: %s,"
" expected %s\n", buf1, buf2);
match = ISC_FALSE;
}
}
result = dns_message_peekheader(b, &id, &msgflags);
if (result != ISC_R_SUCCESS || l->sendmsg->id != id) {
match = ISC_FALSE;
if (l->tcp_mode) {
isc_boolean_t fail = ISC_TRUE;
if (result == ISC_R_SUCCESS) {
if (!query->first_soa_rcvd ||
query->warn_id)
printf(";; %s: ID mismatch: "
"expected ID %u, got %u\n",
query->first_soa_rcvd ?
"WARNING" : "ERROR",
l->sendmsg->id, id);
if (query->first_soa_rcvd)
fail = ISC_FALSE;
query->warn_id = ISC_FALSE;
} else
printf(";; ERROR: short "
"(< header size) message\n");
if (fail) {
isc_event_free(&event);
clear_query(query);
check_next_lookup(l);
UNLOCK_LOOKUP;
return;
}
match = ISC_TRUE;
} else if (result == ISC_R_SUCCESS)
printf(";; Warning: ID mismatch: "
"expected ID %u, got %u\n", l->sendmsg->id, id);
else
printf(";; Warning: short "
"(< header size) message received\n");
}
if (result == ISC_R_SUCCESS && (msgflags & DNS_MESSAGEFLAG_QR) == 0)
printf(";; Warning: query response not set\n");
if (!match)
goto udp_mismatch;
result = dns_message_create(mctx, DNS_MESSAGE_INTENTPARSE, &msg);
check_result(result, "dns_message_create");
if (key != NULL) {
if (l->querysig == NULL) {
debug("getting initial querysig");
result = dns_message_getquerytsig(l->sendmsg, mctx,
&l->querysig);
check_result(result, "dns_message_getquerytsig");
}
result = dns_message_setquerytsig(msg, l->querysig);
check_result(result, "dns_message_setquerytsig");
result = dns_message_settsigkey(msg, key);
check_result(result, "dns_message_settsigkey");
msg->tsigctx = l->tsigctx;
l->tsigctx = NULL;
if (l->msgcounter != 0)
msg->tcp_continuation = 1;
l->msgcounter++;
}
debug("before parse starts");
parseflags = DNS_MESSAGEPARSE_PRESERVEORDER;
#ifdef DIG_SIGCHASE
if (!l->sigchase) {
do_sigchase = ISC_FALSE;
} else {
parseflags = 0;
do_sigchase = ISC_TRUE;
}
#endif
if (l->besteffort) {
parseflags |= DNS_MESSAGEPARSE_BESTEFFORT;
parseflags |= DNS_MESSAGEPARSE_IGNORETRUNCATION;
}
result = dns_message_parse(msg, b, parseflags);
if (result == DNS_R_RECOVERABLE) {
printf(";; Warning: Message parser reports malformed "
"message packet.\n");
result = ISC_R_SUCCESS;
}
if (result != ISC_R_SUCCESS) {
printf(";; Got bad packet: %s\n", isc_result_totext(result));
hex_dump(b);
query->waiting_connect = ISC_FALSE;
dns_message_destroy(&msg);
isc_event_free(&event);
clear_query(query);
cancel_lookup(l);
check_next_lookup(l);
UNLOCK_LOOKUP;
return;
}
if (msg->counts[DNS_SECTION_QUESTION] != 0) {
match = ISC_TRUE;
for (result = dns_message_firstname(msg, DNS_SECTION_QUESTION);
result == ISC_R_SUCCESS && match;
result = dns_message_nextname(msg, DNS_SECTION_QUESTION)) {
dns_name_t *name = NULL;
dns_rdataset_t *rdataset;
dns_message_currentname(msg, DNS_SECTION_QUESTION,
&name);
for (rdataset = ISC_LIST_HEAD(name->list);
rdataset != NULL;
rdataset = ISC_LIST_NEXT(rdataset, link)) {
if (l->rdtype != rdataset->type ||
l->rdclass != rdataset->rdclass ||
!dns_name_equal(l->name, name)) {
char namestr[DNS_NAME_FORMATSIZE];
char typebuf[DNS_RDATATYPE_FORMATSIZE];
char classbuf[DNS_RDATACLASS_FORMATSIZE];
dns_name_format(name, namestr,
sizeof(namestr));
dns_rdatatype_format(rdataset->type,
typebuf,
sizeof(typebuf));
dns_rdataclass_format(rdataset->rdclass,
classbuf,
sizeof(classbuf));
printf(";; Question section mismatch: "
"got %s/%s/%s\n",
namestr, typebuf, classbuf);
match = ISC_FALSE;
}
}
}
if (!match) {
dns_message_destroy(&msg);
if (l->tcp_mode) {
isc_event_free(&event);
clear_query(query);
check_next_lookup(l);
UNLOCK_LOOKUP;
return;
} else
goto udp_mismatch;
}
}
if (msg->rcode == dns_rcode_badvers && msg->opt != NULL &&
(newedns = ednsvers(msg->opt)) < l->edns && l->ednsneg) {
/*
* Add minimum EDNS version required checks here if needed.
*/
if (l->comments)
printf(";; BADVERS, retrying with EDNS version %u.\n",
newedns);
l->edns = newedns;
n = requeue_lookup(l, ISC_TRUE);
n->origin = query->lookup->origin;
dns_message_destroy(&msg);
isc_event_free(&event);
clear_query(query);
cancel_lookup(l);
check_next_lookup(l);
UNLOCK_LOOKUP;
return;
}
if ((msg->flags & DNS_MESSAGEFLAG_TC) != 0 &&
!l->ignore && !l->tcp_mode) {
if (l->cookie == NULL && l->sendcookie && msg->opt != NULL)
process_opt(l, msg);
if (l->comments)
printf(";; Truncated, retrying in TCP mode.\n");
n = requeue_lookup(l, ISC_TRUE);
n->tcp_mode = ISC_TRUE;
n->origin = query->lookup->origin;
dns_message_destroy(&msg);
isc_event_free(&event);
clear_query(query);
cancel_lookup(l);
check_next_lookup(l);
UNLOCK_LOOKUP;
return;
}
if (msg->rcode == dns_rcode_badcookie && !l->tcp_mode &&
l->sendcookie && l->badcookie) {
process_opt(l, msg);
if (msg->cc_ok) {
if (l->comments)
printf(";; BADCOOKIE, retrying%s.\n",
l->seenbadcookie ? " in TCP mode" : "");
n = requeue_lookup(l, ISC_TRUE);
if (l->seenbadcookie)
n->tcp_mode = ISC_TRUE;
n->seenbadcookie = ISC_TRUE;
n->origin = query->lookup->origin;
dns_message_destroy(&msg);
isc_event_free(&event);
clear_query(query);
cancel_lookup(l);
check_next_lookup(l);
UNLOCK_LOOKUP;
return;
}
}
if ((msg->rcode == dns_rcode_servfail && !l->servfail_stops) ||
(check_ra && (msg->flags & DNS_MESSAGEFLAG_RA) == 0 && l->recurse))
{
dig_query_t *next = ISC_LIST_NEXT(query, link);
if (l->current_query == query)
l->current_query = NULL;
if (next != NULL) {
debug("sending query %p\n", next);
if (l->tcp_mode)
send_tcp_connect(next);
else
send_udp(next);
}
/*
* If our query is at the head of the list and there
* is no next, we're the only one left, so fall
* through to print the message.
*/
if ((ISC_LIST_HEAD(l->q) != query) ||
(ISC_LIST_NEXT(query, link) != NULL)) {
if (l->comments)
printf(";; Got %s from %s, "
"trying next server\n",
msg->rcode == dns_rcode_servfail ?
"SERVFAIL reply" :
"recursion not available",
query->servname);
clear_query(query);
check_next_lookup(l);
dns_message_destroy(&msg);
isc_event_free(&event);
UNLOCK_LOOKUP;
return;
}
}
if (key != NULL) {
result = dns_tsig_verify(&query->recvbuf, msg, NULL, NULL);
if (result != ISC_R_SUCCESS) {
printf(";; Couldn't verify signature: %s\n",
isc_result_totext(result));
validated = ISC_FALSE;
}
l->tsigctx = msg->tsigctx;
msg->tsigctx = NULL;
if (l->querysig != NULL) {
debug("freeing querysig buffer %p", l->querysig);
isc_buffer_free(&l->querysig);
}
result = dns_message_getquerytsig(msg, mctx, &l->querysig);
check_result(result,"dns_message_getquerytsig");
}
extrabytes = isc_buffer_remaininglength(b);
debug("after parse");
if (l->doing_xfr && l->xfr_q == NULL) {
l->xfr_q = query;
/*
* Once we are in the XFR message, increase
* the timeout to much longer, so brief network
* outages won't cause the XFR to abort
*/
if (timeout != INT_MAX && l->timer != NULL) {
unsigned int local_timeout;
if (timeout == 0) {
if (l->tcp_mode)
local_timeout = TCP_TIMEOUT * 4;
else
local_timeout = UDP_TIMEOUT * 4;
} else {
if (timeout < (INT_MAX / 4))
local_timeout = timeout * 4;
else
local_timeout = INT_MAX;
}
debug("have local timeout of %d", local_timeout);
isc_interval_set(&l->interval, local_timeout, 0);
result = isc_timer_reset(l->timer,
isc_timertype_once,
NULL,
&l->interval,
ISC_FALSE);
check_result(result, "isc_timer_reset");
}
}
if (l->cookie != NULL) {
if (msg->opt == NULL)
printf(";; expected opt record in response\n");
else
process_opt(l, msg);
} else if (l->sendcookie && msg->opt != NULL)
process_opt(l, msg);
if (!l->doing_xfr || l->xfr_q == query) {
if (msg->rcode == dns_rcode_nxdomain &&
(l->origin != NULL || l->need_search)) {
if (!next_origin(query->lookup) || showsearch) {
printmessage(query, msg, ISC_TRUE);
received(b->used, &sevent->address, query);
}
} else if (!l->trace && !l->ns_search_only) {
#ifdef DIG_SIGCHASE
if (!do_sigchase)
#endif
printmessage(query, msg, ISC_TRUE);
} else if (l->trace) {
int nl = 0;
int count = msg->counts[DNS_SECTION_ANSWER];
debug("in TRACE code");
if (!l->ns_search_only)
printmessage(query, msg, ISC_TRUE);
l->rdtype = l->qrdtype;
if (l->trace_root || (l->ns_search_only && count > 0)) {
if (!l->trace_root)
l->rdtype = dns_rdatatype_soa;
nl = followup_lookup(msg, query,
DNS_SECTION_ANSWER);
l->trace_root = ISC_FALSE;
} else if (count == 0)
nl = followup_lookup(msg, query,
DNS_SECTION_AUTHORITY);
if (nl == 0)
docancel = ISC_TRUE;
} else {
debug("in NSSEARCH code");
if (l->trace_root) {
/*
* This is the initial NS query.
*/
int nl;
l->rdtype = dns_rdatatype_soa;
nl = followup_lookup(msg, query,
DNS_SECTION_ANSWER);
if (nl == 0)
docancel = ISC_TRUE;
l->trace_root = ISC_FALSE;
usesearch = ISC_FALSE;
} else
#ifdef DIG_SIGCHASE
if (!do_sigchase)
#endif
printmessage(query, msg, ISC_TRUE);
}
#ifdef DIG_SIGCHASE
if (do_sigchase) {
chase_msg = isc_mem_allocate(mctx,
sizeof(dig_message_t));
if (chase_msg == NULL) {
fatal("Memory allocation failure in %s:%d",
__FILE__, __LINE__);
}
ISC_LIST_INITANDAPPEND(chase_message_list, chase_msg,
link);
if (dns_message_create(mctx, DNS_MESSAGE_INTENTPARSE,
&msg_temp) != ISC_R_SUCCESS) {
fatal("dns_message_create in %s:%d",
__FILE__, __LINE__);
}
isc_buffer_usedregion(b, &r);
result = isc_buffer_allocate(mctx, &buf, r.length);
check_result(result, "isc_buffer_allocate");
result = isc_buffer_copyregion(buf, &r);
check_result(result, "isc_buffer_copyregion");
result = dns_message_parse(msg_temp, buf, 0);
isc_buffer_free(&buf);
chase_msg->msg = msg_temp;
chase_msg2 = isc_mem_allocate(mctx,
sizeof(dig_message_t));
if (chase_msg2 == NULL) {
fatal("Memory allocation failure in %s:%d",
__FILE__, __LINE__);
}
ISC_LIST_INITANDAPPEND(chase_message_list2, chase_msg2,
link);
chase_msg2->msg = msg;
}
#endif
}
#ifdef DIG_SIGCHASE
if (l->sigchase && ISC_LIST_EMPTY(lookup_list)) {
sigchase(msg_temp);
}
#endif
if (l->pending)
debug("still pending.");
if (l->doing_xfr) {
if (query != l->xfr_q) {
dns_message_destroy(&msg);
isc_event_free(&event);
query->waiting_connect = ISC_FALSE;
UNLOCK_LOOKUP;
return;
}
if (!docancel)
docancel = check_for_more_data(query, msg, sevent);
if (docancel) {
dns_message_destroy(&msg);
clear_query(query);
cancel_lookup(l);
check_next_lookup(l);
}
} else {
if (msg->rcode == dns_rcode_noerror || l->origin == NULL) {
#ifdef DIG_SIGCHASE
if (!l->sigchase)
#endif
received(b->used, &sevent->address, query);
}
if (!query->lookup->ns_search_only)
query->lookup->pending = ISC_FALSE;
if (!query->lookup->ns_search_only ||
query->lookup->trace_root || docancel) {
#ifdef DIG_SIGCHASE
if (!do_sigchase)
#endif
dns_message_destroy(&msg);
cancel_lookup(l);
}
clear_query(query);
check_next_lookup(l);
}
if (msg != NULL) {
#ifdef DIG_SIGCHASE
if (do_sigchase)
msg = NULL;
else
#endif
dns_message_destroy(&msg);
}
isc_event_free(&event);
UNLOCK_LOOKUP;
return;
udp_mismatch:
isc_buffer_invalidate(&query->recvbuf);
isc_buffer_init(&query->recvbuf, query->recvspace, COMMSIZE);
ISC_LIST_ENQUEUE(query->recvlist, &query->recvbuf, link);
result = isc_socket_recvv(query->sock, &query->recvlist, 1,
global_task, recv_done, query);
check_result(result, "isc_socket_recvv");
recvcount++;
isc_event_free(&event);
UNLOCK_LOOKUP;
return;
}
/*%
* Turn a name into an address, using system-supplied routines. This is
* used in looking up server names, etc... and needs to use system-supplied
* routines, since they may be using a non-DNS system for these lookups.
*/
isc_result_t
get_address(char *host, in_port_t myport, isc_sockaddr_t *sockaddr) {
int count;
isc_result_t result;
isc_boolean_t is_running;
is_running = isc_app_isrunning();
if (is_running)
isc_app_block();
result = bind9_getaddresses(host, myport, sockaddr, 1, &count);
if (is_running)
isc_app_unblock();
if (result != ISC_R_SUCCESS)
return (result);
INSIST(count == 1);
return (ISC_R_SUCCESS);
}
int
getaddresses(dig_lookup_t *lookup, const char *host, isc_result_t *resultp) {
isc_result_t result;
isc_sockaddr_t sockaddrs[DIG_MAX_ADDRESSES];
isc_netaddr_t netaddr;
int count, i;
dig_server_t *srv;
char tmp[ISC_NETADDR_FORMATSIZE];
result = bind9_getaddresses(host, 0, sockaddrs,
DIG_MAX_ADDRESSES, &count);
if (resultp != NULL)
*resultp = result;
if (result != ISC_R_SUCCESS) {
if (resultp == NULL)
fatal("couldn't get address for '%s': %s",
host, isc_result_totext(result));
return 0;
}
for (i = 0; i < count; i++) {
isc_netaddr_fromsockaddr(&netaddr, &sockaddrs[i]);
isc_netaddr_format(&netaddr, tmp, sizeof(tmp));
srv = make_server(tmp, host);
ISC_LIST_APPEND(lookup->my_server_list, srv, link);
}
return count;
}
/*%
* Initiate either a TCP or UDP lookup
*/
void
do_lookup(dig_lookup_t *lookup) {
dig_query_t *query;
REQUIRE(lookup != NULL);
debug("do_lookup()");
lookup->pending = ISC_TRUE;
query = ISC_LIST_HEAD(lookup->q);
if (query != NULL) {
if (lookup->tcp_mode)
send_tcp_connect(query);
else
send_udp(query);
}
}
/*%
* Start everything in action upon task startup.
*/
void
onrun_callback(isc_task_t *task, isc_event_t *event) {
UNUSED(task);
isc_event_free(&event);
LOCK_LOOKUP;
start_lookup();
UNLOCK_LOOKUP;
}
/*%
* Make everything on the lookup queue go away. Mainly used by the
* SIGINT handler.
*/
void
cancel_all(void) {
dig_lookup_t *l, *n;
dig_query_t *q, *nq;
debug("cancel_all()");
LOCK_LOOKUP;
if (free_now) {
UNLOCK_LOOKUP;
return;
}
cancel_now = ISC_TRUE;
if (current_lookup != NULL) {
if (current_lookup->timer != NULL)
isc_timer_detach(&current_lookup->timer);
for (q = ISC_LIST_HEAD(current_lookup->q);
q != NULL;
q = nq)
{
nq = ISC_LIST_NEXT(q, link);
debug("canceling pending query %p, belonging to %p",
q, current_lookup);
if (q->sock != NULL)
isc_socket_cancel(q->sock, NULL,
ISC_SOCKCANCEL_ALL);
else
clear_query(q);
}
for (q = ISC_LIST_HEAD(current_lookup->connecting);
q != NULL;
q = nq)
{
nq = ISC_LIST_NEXT(q, clink);
debug("canceling connecting query %p, belonging to %p",
q, current_lookup);
if (q->sock != NULL)
isc_socket_cancel(q->sock, NULL,
ISC_SOCKCANCEL_ALL);
else
clear_query(q);
}
}
l = ISC_LIST_HEAD(lookup_list);
while (l != NULL) {
n = ISC_LIST_NEXT(l, link);
ISC_LIST_DEQUEUE(lookup_list, l, link);
try_clear_lookup(l);
l = n;
}
UNLOCK_LOOKUP;
}
/*%
* Destroy all of the libs we are using, and get everything ready for a
* clean shutdown.
*/
void
destroy_libs(void) {
#ifdef DIG_SIGCHASE
void * ptr;
dig_message_t *chase_msg;
#endif
#ifdef WITH_IDN
isc_result_t result;
#endif
if (keep != NULL)
isc_socket_detach(&keep);
debug("destroy_libs()");
if (global_task != NULL) {
debug("freeing task");
isc_task_detach(&global_task);
}
/*
* The taskmgr_destroy() call blocks until all events are cleared
* from the task.
*/
if (taskmgr != NULL) {
debug("freeing taskmgr");
isc_taskmgr_destroy(&taskmgr);
}
LOCK_LOOKUP;
REQUIRE(sockcount == 0);
REQUIRE(recvcount == 0);
REQUIRE(sendcount == 0);
INSIST(ISC_LIST_HEAD(lookup_list) == NULL);
INSIST(current_lookup == NULL);
INSIST(!free_now);
free_now = ISC_TRUE;
lwres_conf_clear(lwctx);
lwres_context_destroy(&lwctx);
flush_server_list();
clear_searchlist();
#ifdef WITH_IDN
result = dns_name_settotextfilter(NULL);
check_result(result, "dns_name_settotextfilter");
#endif
dns_name_destroy();
if (commctx != NULL) {
debug("freeing commctx");
isc_mempool_destroy(&commctx);
}
if (socketmgr != NULL) {
debug("freeing socketmgr");
isc_socketmgr_destroy(&socketmgr);
}
if (timermgr != NULL) {
debug("freeing timermgr");
isc_timermgr_destroy(&timermgr);
}
if (key != NULL) {
debug("freeing key %p", key);
dns_tsigkey_detach(&key);
}
if (namebuf != NULL)
isc_buffer_free(&namebuf);
if (is_dst_up) {
debug("destroy DST lib");
dst_lib_destroy();
is_dst_up = ISC_FALSE;
}
if (entp != NULL) {
debug("detach from entropy");
isc_entropy_detach(&entp);
}
UNLOCK_LOOKUP;
DESTROYLOCK(&lookup_lock);
#ifdef DIG_SIGCHASE
debug("Destroy the messages kept for sigchase");
/* Destroy the messages kept for sigchase */
chase_msg = ISC_LIST_HEAD(chase_message_list);
while (chase_msg != NULL) {
INSIST(chase_msg->msg != NULL);
dns_message_destroy(&(chase_msg->msg));
ptr = chase_msg;
chase_msg = ISC_LIST_NEXT(chase_msg, link);
isc_mem_free(mctx, ptr);
}
chase_msg = ISC_LIST_HEAD(chase_message_list2);
while (chase_msg != NULL) {
INSIST(chase_msg->msg != NULL);
dns_message_destroy(&(chase_msg->msg));
ptr = chase_msg;
chase_msg = ISC_LIST_NEXT(chase_msg, link);
isc_mem_free(mctx, ptr);
}
if (dns_name_dynamic(&chase_name))
free_name(&chase_name);
#if DIG_SIGCHASE_TD
if (dns_name_dynamic(&chase_current_name))
free_name(&chase_current_name);
if (dns_name_dynamic(&chase_authority_name))
free_name(&chase_authority_name);
#endif
#if DIG_SIGCHASE_BU
if (dns_name_dynamic(&chase_signame))
free_name(&chase_signame);
#endif
#endif
debug("Removing log context");
isc_log_destroy(&lctx);
while (ednsoptscnt > 0U) {
ednsoptscnt--;
if (ednsopts[ednsoptscnt].value != NULL)
isc_mem_free(mctx, ednsopts[ednsoptscnt].value);
}
debug("Destroy memory");
if (memdebugging != 0)
isc_mem_stats(mctx, stderr);
if (mctx != NULL)
isc_mem_destroy(&mctx);
}
#ifdef WITH_IDN
static void
initialize_idn(void) {
idn_result_t r;
isc_result_t result;
#ifdef HAVE_SETLOCALE
/* Set locale */
(void)setlocale(LC_ALL, "");
#endif
/* Create configuration context. */
r = idn_nameinit(1);
if (r != idn_success)
fatal("idn api initialization failed: %s",
idn_result_tostring(r));
/* Set domain name -> text post-conversion filter. */
result = dns_name_settotextfilter(output_filter);
check_result(result, "dns_name_settotextfilter");
}
static isc_result_t
output_filter(isc_buffer_t *buffer, unsigned int used_org,
isc_boolean_t absolute)
{
char tmp1[MAXDLEN], tmp2[MAXDLEN];
size_t fromlen, tolen;
isc_boolean_t end_with_dot;
/*
* Copy contents of 'buffer' to 'tmp1', supply trailing dot
* if 'absolute' is true, and terminate with NUL.
*/
fromlen = isc_buffer_usedlength(buffer) - used_org;
if (fromlen >= MAXDLEN)
return (ISC_R_SUCCESS);
memmove(tmp1, (char *)isc_buffer_base(buffer) + used_org, fromlen);
end_with_dot = (tmp1[fromlen - 1] == '.') ? ISC_TRUE : ISC_FALSE;
if (absolute && !end_with_dot) {
fromlen++;
if (fromlen >= MAXDLEN)
return (ISC_R_SUCCESS);
tmp1[fromlen - 1] = '.';
}
tmp1[fromlen] = '\0';
/*
* Convert contents of 'tmp1' to local encoding.
*/
if (idn_decodename(IDN_DECODE_APP, tmp1, tmp2, MAXDLEN) != idn_success)
return (ISC_R_SUCCESS);
strcpy(tmp1, tmp2);
/*
* Copy the converted contents in 'tmp1' back to 'buffer'.
* If we have appended trailing dot, remove it.
*/
tolen = strlen(tmp1);
if (absolute && !end_with_dot && tmp1[tolen - 1] == '.')
tolen--;
if (isc_buffer_length(buffer) < used_org + tolen)
return (ISC_R_NOSPACE);
isc_buffer_subtract(buffer, isc_buffer_usedlength(buffer) - used_org);
memmove(isc_buffer_used(buffer), tmp1, tolen);
isc_buffer_add(buffer, (unsigned int)tolen);
return (ISC_R_SUCCESS);
}
static idn_result_t
append_textname(char *name, const char *origin, size_t namesize) {
size_t namelen = strlen(name);
size_t originlen = strlen(origin);
/* Already absolute? */
if (namelen > 0 && name[namelen - 1] == '.')
return idn_success;
/* Append dot and origin */
if (namelen + 1 + originlen >= namesize)
return idn_buffer_overflow;
if (*origin != '.')
name[namelen++] = '.';
(void)strcpy(name + namelen, origin);
return idn_success;
}
static void
idn_check_result(idn_result_t r, const char *msg) {
if (r != idn_success) {
exitcode = 1;
fatal("%s: %s", msg, idn_result_tostring(r));
}
}
#endif /* WITH_IDN */
#ifdef DIG_SIGCHASE
void
print_type(dns_rdatatype_t type)
{
isc_buffer_t * b = NULL;
isc_result_t result;
isc_region_t r;
result = isc_buffer_allocate(mctx, &b, 4000);
check_result(result, "isc_buffer_allocate");
result = dns_rdatatype_totext(type, b);
check_result(result, "print_type");
isc_buffer_usedregion(b, &r);
r.base[r.length] = '\0';
printf("%s", r.base);
isc_buffer_free(&b);
}
void
dump_database_section(dns_message_t *msg, int section)
{
dns_name_t *msg_name=NULL;
dns_rdataset_t *rdataset;
do {
dns_message_currentname(msg, section, &msg_name);
for (rdataset = ISC_LIST_HEAD(msg_name->list); rdataset != NULL;
rdataset = ISC_LIST_NEXT(rdataset, link)) {
dns_name_print(msg_name, stdout);
printf("\n");
print_rdataset(msg_name, rdataset);
printf("end\n");
}
msg_name = NULL;
} while (dns_message_nextname(msg, section) == ISC_R_SUCCESS);
}
void
dump_database(void) {
dig_message_t * msg;
for (msg = ISC_LIST_HEAD(chase_message_list); msg != NULL;
msg = ISC_LIST_NEXT(msg, link)) {
if (dns_message_firstname(msg->msg, DNS_SECTION_ANSWER)
== ISC_R_SUCCESS)
dump_database_section(msg->msg, DNS_SECTION_ANSWER);
if (dns_message_firstname(msg->msg, DNS_SECTION_AUTHORITY)
== ISC_R_SUCCESS)
dump_database_section(msg->msg, DNS_SECTION_AUTHORITY);
if (dns_message_firstname(msg->msg, DNS_SECTION_ADDITIONAL)
== ISC_R_SUCCESS)
dump_database_section(msg->msg, DNS_SECTION_ADDITIONAL);
}
}
dns_rdataset_t *
search_type(dns_name_t *name, dns_rdatatype_t type, dns_rdatatype_t covers) {
dns_rdataset_t *rdataset;
dns_rdata_sig_t siginfo;
dns_rdata_t sigrdata = DNS_RDATA_INIT;
isc_result_t result;
for (rdataset = ISC_LIST_HEAD(name->list); rdataset != NULL;
rdataset = ISC_LIST_NEXT(rdataset, link)) {
if (type == dns_rdatatype_any) {
if (rdataset->type != dns_rdatatype_rrsig)
return (rdataset);
} else if ((type == dns_rdatatype_rrsig) &&
(rdataset->type == dns_rdatatype_rrsig)) {
result = dns_rdataset_first(rdataset);
check_result(result, "empty rdataset");
dns_rdataset_current(rdataset, &sigrdata);
result = dns_rdata_tostruct(&sigrdata, &siginfo, NULL);
check_result(result, "sigrdata tostruct siginfo");
if ((siginfo.covered == covers) ||
(covers == dns_rdatatype_any)) {
dns_rdata_reset(&sigrdata);
dns_rdata_freestruct(&siginfo);
return (rdataset);
}
dns_rdata_reset(&sigrdata);
dns_rdata_freestruct(&siginfo);
} else if (rdataset->type == type)
return (rdataset);
}
return (NULL);
}
dns_rdataset_t *
chase_scanname_section(dns_message_t *msg, dns_name_t *name,
dns_rdatatype_t type, dns_rdatatype_t covers,
int section)
{
dns_rdataset_t *rdataset;
dns_name_t *msg_name = NULL;
if (msg->counts[section] == 0)
return (NULL);
do {
dns_message_currentname(msg, section, &msg_name);
if (dns_name_compare(msg_name, name) == 0) {
rdataset = search_type(msg_name, type, covers);
if (rdataset != NULL)
return (rdataset);
}
msg_name = NULL;
} while (dns_message_nextname(msg, section) == ISC_R_SUCCESS);
return (NULL);
}
dns_rdataset_t *
chase_scanname(dns_name_t *name, dns_rdatatype_t type, dns_rdatatype_t covers)
{
dns_rdataset_t *rdataset = NULL;
dig_message_t * msg;
for (msg = ISC_LIST_HEAD(chase_message_list2); msg != NULL;
msg = ISC_LIST_NEXT(msg, link)) {
if (dns_message_firstname(msg->msg, DNS_SECTION_ANSWER)
== ISC_R_SUCCESS)
rdataset = chase_scanname_section(msg->msg, name,
type, covers,
DNS_SECTION_ANSWER);
if (rdataset != NULL)
return (rdataset);
if (dns_message_firstname(msg->msg, DNS_SECTION_AUTHORITY)
== ISC_R_SUCCESS)
rdataset =
chase_scanname_section(msg->msg, name,
type, covers,
DNS_SECTION_AUTHORITY);
if (rdataset != NULL)
return (rdataset);
if (dns_message_firstname(msg->msg, DNS_SECTION_ADDITIONAL)
== ISC_R_SUCCESS)
rdataset =
chase_scanname_section(msg->msg, name, type,
covers,
DNS_SECTION_ADDITIONAL);
if (rdataset != NULL)
return (rdataset);
}
return (NULL);
}
dns_rdataset_t *
sigchase_scanname(dns_rdatatype_t type, dns_rdatatype_t covers,
isc_boolean_t * lookedup, dns_name_t *rdata_name)
{
dig_lookup_t *lookup;
isc_buffer_t *b = NULL;
isc_region_t r;
isc_result_t result;
dns_rdataset_t * temp;
dns_rdatatype_t querytype;
temp = chase_scanname(rdata_name, type, covers);
if (temp != NULL)
return (temp);
if (*lookedup == ISC_TRUE)
return (NULL);
lookup = clone_lookup(current_lookup, ISC_TRUE);
lookup->trace_root = ISC_FALSE;
lookup->new_search = ISC_TRUE;
result = isc_buffer_allocate(mctx, &b, BUFSIZE);
check_result(result, "isc_buffer_allocate");
result = dns_name_totext(rdata_name, ISC_FALSE, b);
check_result(result, "dns_name_totext");
isc_buffer_usedregion(b, &r);
r.base[r.length] = '\0';
strlcpy(lookup->textname, (char*)r.base, sizeof(lookup->textname));
isc_buffer_free(&b);
if (type == dns_rdatatype_rrsig)
querytype = covers;
else
querytype = type;
if (querytype == 0 || querytype == 255) {
printf("Error in the queried type: %d\n", querytype);
return (NULL);
}
lookup->rdtype = querytype;
lookup->rdtypeset = ISC_TRUE;
lookup->qrdtype = querytype;
*lookedup = ISC_TRUE;
ISC_LIST_APPEND(lookup_list, lookup, link);
printf("\n\nLaunch a query to find a RRset of type ");
print_type(type);
printf(" for zone: %s\n", lookup->textname);
return (NULL);
}
isc_result_t
insert_trustedkey(void *arg, dns_name_t *name, dns_rdataset_t *rdataset)
{
isc_result_t result;
dst_key_t *dstkey;
UNUSED(arg);
if (rdataset == NULL || rdataset->type != dns_rdatatype_dnskey)
return (ISC_R_SUCCESS);
for (result = dns_rdataset_first(rdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(rdataset)) {
dns_rdata_t rdata = DNS_RDATA_INIT;
isc_buffer_t b;
dns_rdataset_current(rdataset, &rdata);
isc_buffer_init(&b, rdata.data, rdata.length);
isc_buffer_add(&b, rdata.length);
if (tk_list.nb_tk >= MAX_TRUSTED_KEY)
return (ISC_R_SUCCESS);
dstkey = NULL;
result = dst_key_fromdns(name, rdata.rdclass, &b, mctx, &dstkey);
if (result != ISC_R_SUCCESS)
continue;
tk_list.key[tk_list.nb_tk++] = dstkey;
}
return (ISC_R_SUCCESS);
}
void
clean_trustedkey()
{
int i = 0;
for (i= 0; i < MAX_TRUSTED_KEY; i++) {
if (tk_list.key[i] != NULL) {
dst_key_free(&tk_list.key[i]);
tk_list.key[i] = NULL;
} else
break;
}
tk_list.nb_tk = 0;
return;
}
char alphnum[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
isc_result_t
removetmpkey(const char *file)
{
char *tempnamekey = NULL;
int tempnamekeylen;
isc_result_t result;
tempnamekeylen = strlen(file)+10;
tempnamekey = isc_mem_allocate(mctx, tempnamekeylen);
if (tempnamekey == NULL)
return (ISC_R_NOMEMORY);
memset(tempnamekey, 0, tempnamekeylen);
strcat(tempnamekey, file);
strcat(tempnamekey,".key");
isc_file_remove(tempnamekey);
result = isc_file_remove(tempnamekey);
isc_mem_free(mctx, tempnamekey);
return (result);
}
isc_result_t
get_trusted_key(void) {
isc_result_t result;
const char *filename = NULL;
dns_rdatacallbacks_t callbacks;
result = isc_file_exists(trustedkey);
if (result != ISC_TRUE) {
result = isc_file_exists("/etc/trusted-key.key");
if (result != ISC_TRUE) {
result = isc_file_exists("./trusted-key.key");
if (result != ISC_TRUE)
return (ISC_R_FAILURE);
else
filename = "./trusted-key.key";
} else
filename = "/etc/trusted-key.key";
} else
filename = trustedkey;
if (filename == NULL) {
printf("No trusted key\n");
return (ISC_R_FAILURE);
}
dns_rdatacallbacks_init_stdio(&callbacks);
callbacks.add = insert_trustedkey;
return (dns_master_loadfile(filename, dns_rootname, dns_rootname,
current_lookup->rdclass, DNS_MASTER_NOTTL,
&callbacks, mctx));
}
static void
nameFromString(const char *str, dns_name_t *p_ret) {
size_t len = strlen(str);
isc_result_t result;
isc_buffer_t buffer;
dns_fixedname_t fixedname;
REQUIRE(p_ret != NULL);
REQUIRE(str != NULL);
isc_buffer_constinit(&buffer, str, len);
isc_buffer_add(&buffer, len);
dns_fixedname_init(&fixedname);
result = dns_name_fromtext(dns_fixedname_name(&fixedname), &buffer,
dns_rootname, DNS_NAME_DOWNCASE, NULL);
check_result(result, "nameFromString");
if (dns_name_dynamic(p_ret))
free_name(p_ret);
result = dns_name_dup(dns_fixedname_name(&fixedname), mctx, p_ret);
check_result(result, "nameFromString");
}
#if DIG_SIGCHASE_TD
isc_result_t
prepare_lookup(dns_name_t *name)
{
isc_result_t result;
dig_lookup_t *lookup = NULL;
dig_server_t *s;
void *ptr;
lookup = clone_lookup(current_lookup, ISC_TRUE);
lookup->trace_root = ISC_FALSE;
lookup->new_search = ISC_TRUE;
lookup->trace_root_sigchase = ISC_FALSE;
strlcpy(lookup->textname, lookup->textnamesigchase, MXNAME);
lookup->rdtype = lookup->rdtype_sigchase;
lookup->rdtypeset = ISC_TRUE;
lookup->qrdtype = lookup->qrdtype_sigchase;
s = ISC_LIST_HEAD(lookup->my_server_list);
while (s != NULL) {
debug("freeing server %p belonging to %p",
s, lookup);
ptr = s;
s = ISC_LIST_NEXT(s, link);
ISC_LIST_DEQUEUE(lookup->my_server_list,
(dig_server_t *)ptr, link);
isc_mem_free(mctx, ptr);
}
for (result = dns_rdataset_first(chase_nsrdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(chase_nsrdataset)) {
char namestr[DNS_NAME_FORMATSIZE];
dns_rdata_ns_t ns;
dns_rdata_t rdata = DNS_RDATA_INIT;
dig_server_t * srv = NULL;
#define __FOLLOW_GLUE__
#ifdef __FOLLOW_GLUE__
isc_buffer_t *b = NULL;
isc_region_t r;
dns_rdataset_t *rdataset = NULL;
isc_boolean_t true = ISC_TRUE;
#endif
memset(namestr, 0, DNS_NAME_FORMATSIZE);
dns_rdataset_current(chase_nsrdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &ns, NULL);
check_result(result, "dns_rdata_tostruct");
#ifdef __FOLLOW_GLUE__
result = advanced_rrsearch(&rdataset, &ns.name,
dns_rdatatype_aaaa,
dns_rdatatype_any, &true);
if (result == ISC_R_SUCCESS) {
for (result = dns_rdataset_first(rdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(rdataset)) {
dns_rdata_t aaaa = DNS_RDATA_INIT;
dns_rdataset_current(rdataset, &aaaa);
result = isc_buffer_allocate(mctx, &b, 80);
check_result(result, "isc_buffer_allocate");
dns_rdata_totext(&aaaa, &ns.name, b);
isc_buffer_usedregion(b, &r);
r.base[r.length] = '\0';
strlcpy(namestr, (char*)r.base,
DNS_NAME_FORMATSIZE);
isc_buffer_free(&b);
dns_rdata_reset(&aaaa);
srv = make_server(namestr, namestr);
ISC_LIST_APPEND(lookup->my_server_list,
srv, link);
}
}
rdataset = NULL;
result = advanced_rrsearch(&rdataset, &ns.name, dns_rdatatype_a,
dns_rdatatype_any, &true);
if (result == ISC_R_SUCCESS) {
for (result = dns_rdataset_first(rdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(rdataset)) {
dns_rdata_t a = DNS_RDATA_INIT;
dns_rdataset_current(rdataset, &a);
result = isc_buffer_allocate(mctx, &b, 80);
check_result(result, "isc_buffer_allocate");
dns_rdata_totext(&a, &ns.name, b);
isc_buffer_usedregion(b, &r);
r.base[r.length] = '\0';
strlcpy(namestr, (char*)r.base,
DNS_NAME_FORMATSIZE);
isc_buffer_free(&b);
dns_rdata_reset(&a);
printf("ns name: %s\n", namestr);
srv = make_server(namestr, namestr);
ISC_LIST_APPEND(lookup->my_server_list,
srv, link);
}
}
#else
dns_name_format(&ns.name, namestr, sizeof(namestr));
printf("ns name: ");
dns_name_print(&ns.name, stdout);
printf("\n");
srv = make_server(namestr, namestr);
ISC_LIST_APPEND(lookup->my_server_list, srv, link);
#endif
dns_rdata_freestruct(&ns);
dns_rdata_reset(&rdata);
}
ISC_LIST_APPEND(lookup_list, lookup, link);
printf("\nLaunch a query to find a RRset of type ");
print_type(lookup->rdtype);
printf(" for zone: %s", lookup->textname);
printf(" with nameservers:");
printf("\n");
print_rdataset(name, chase_nsrdataset);
return (ISC_R_SUCCESS);
}
isc_result_t
child_of_zone(dns_name_t * name, dns_name_t * zone_name,
dns_name_t * child_name)
{
dns_namereln_t name_reln;
int orderp;
unsigned int nlabelsp;
name_reln = dns_name_fullcompare(name, zone_name, &orderp, &nlabelsp);
if (name_reln != dns_namereln_subdomain ||
dns_name_countlabels(name) <= dns_name_countlabels(zone_name) + 1) {
printf("\n;; ERROR : ");
dns_name_print(name, stdout);
printf(" is not a subdomain of: ");
dns_name_print(zone_name, stdout);
printf(" FAILED\n\n");
return (ISC_R_FAILURE);
}
dns_name_getlabelsequence(name,
dns_name_countlabels(name) -
dns_name_countlabels(zone_name) -1,
dns_name_countlabels(zone_name) +1,
child_name);
return (ISC_R_SUCCESS);
}
isc_result_t
grandfather_pb_test(dns_name_t *zone_name, dns_rdataset_t *sigrdataset) {
dns_rdata_sig_t siginfo;
dns_rdataset_t mysigrdataset;
isc_result_t result;
dns_rdataset_init(&mysigrdataset);
dns_rdataset_clone(sigrdataset, &mysigrdataset);
result = dns_rdataset_first(&mysigrdataset);
check_result(result, "empty RRSIG dataset");
do {
dns_rdata_t sigrdata = DNS_RDATA_INIT;
dns_rdataset_current(&mysigrdataset, &sigrdata);
result = dns_rdata_tostruct(&sigrdata, &siginfo, NULL);
check_result(result, "sigrdata tostruct siginfo");
if (dns_name_compare(&siginfo.signer, zone_name) == 0) {
result = ISC_R_SUCCESS;
goto cleanup;
}
} while (dns_rdataset_next(&mysigrdataset) == ISC_R_SUCCESS);
result = ISC_R_FAILURE;
cleanup:
dns_rdataset_disassociate(&mysigrdataset);
return (result);
}
isc_result_t
initialization(dns_name_t *name)
{
isc_result_t result;
isc_boolean_t true = ISC_TRUE;
chase_nsrdataset = NULL;
result = advanced_rrsearch(&chase_nsrdataset, name, dns_rdatatype_ns,
dns_rdatatype_any, &true);
if (result != ISC_R_SUCCESS) {
printf("\n;; NS RRset is missing to continue validation:"
" FAILED\n\n");
return (ISC_R_FAILURE);
}
INSIST(chase_nsrdataset != NULL);
prepare_lookup(name);
dup_name(name, &chase_current_name);
return (ISC_R_SUCCESS);
}
#endif
void
print_rdataset(dns_name_t *name, dns_rdataset_t *rdataset)
{
isc_buffer_t *b = NULL;
isc_result_t result;
isc_region_t r;
result = isc_buffer_allocate(mctx, &b, 9000);
check_result(result, "isc_buffer_allocate");
printrdataset(name, rdataset, b);
isc_buffer_usedregion(b, &r);
r.base[r.length] = '\0';
printf("%s\n", r.base);
isc_buffer_free(&b);
}
void
dup_name(dns_name_t *source, dns_name_t *target) {
isc_result_t result;
if (dns_name_dynamic(target))
free_name(target);
result = dns_name_dup(source, mctx, target);
check_result(result, "dns_name_dup");
}
void
free_name(dns_name_t *name) {
dns_name_free(name, mctx);
dns_name_init(name, NULL);
}
/*
*
* take a DNSKEY RRset and the RRSIG RRset corresponding in parameter
* return ISC_R_SUCCESS if the DNSKEY RRset contains a trusted_key
* and the RRset is valid
* return ISC_R_NOTFOUND if not contains trusted key
or if the RRset isn't valid
* return ISC_R_FAILURE if problem
*
*/
isc_result_t
contains_trusted_key(dns_name_t *name, dns_rdataset_t *rdataset,
dns_rdataset_t *sigrdataset)
{
dns_rdataset_t myrdataset;
dst_key_t *dnsseckey = NULL;
int i;
isc_result_t result;
if (name == NULL || rdataset == NULL)
return (ISC_R_FAILURE);
dns_rdataset_init(&myrdataset);
dns_rdataset_clone(rdataset, &myrdataset);
result = dns_rdataset_first(&myrdataset);
check_result(result, "empty rdataset");
do {
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdataset_current(&myrdataset, &rdata);
INSIST(rdata.type == dns_rdatatype_dnskey);
result = dns_dnssec_keyfromrdata(name, &rdata,
mctx, &dnsseckey);
check_result(result, "dns_dnssec_keyfromrdata");
for (i = 0; i < tk_list.nb_tk; i++) {
if (dst_key_compare(tk_list.key[i], dnsseckey)
== ISC_TRUE) {
dns_rdata_reset(&rdata);
printf(";; Ok, find a Trusted Key in the "
"DNSKEY RRset: %d\n",
dst_key_id(dnsseckey));
result = sigchase_verify_sig_key(name, rdataset,
dnsseckey,
sigrdataset);
if (result == ISC_R_SUCCESS)
goto cleanup;
}
}
dst_key_free(&dnsseckey);
} while (dns_rdataset_next(&myrdataset) == ISC_R_SUCCESS);
result = ISC_R_NOTFOUND;
cleanup:
if (dnsseckey != NULL)
dst_key_free(&dnsseckey);
dns_rdataset_disassociate(&myrdataset);
return (result);
}
isc_result_t
sigchase_verify_sig(dns_name_t *name, dns_rdataset_t *rdataset,
dns_rdataset_t *keyrdataset,
dns_rdataset_t *sigrdataset)
{
dns_rdataset_t mykeyrdataset;
dst_key_t *dnsseckey = NULL;
isc_result_t result;
dns_rdataset_init(&mykeyrdataset);
dns_rdataset_clone(keyrdataset, &mykeyrdataset);
result = dns_rdataset_first(&mykeyrdataset);
check_result(result, "empty DNSKEY dataset");
do {
dns_rdata_t keyrdata = DNS_RDATA_INIT;
dns_rdataset_current(&mykeyrdataset, &keyrdata);
INSIST(keyrdata.type == dns_rdatatype_dnskey);
result = dns_dnssec_keyfromrdata(name, &keyrdata,
mctx, &dnsseckey);
check_result(result, "dns_dnssec_keyfromrdata");
result = sigchase_verify_sig_key(name, rdataset, dnsseckey,
sigrdataset);
if (result == ISC_R_SUCCESS)
goto cleanup;
dst_key_free(&dnsseckey);
} while (dns_rdataset_next(&mykeyrdataset) == ISC_R_SUCCESS);
result = ISC_R_NOTFOUND;
cleanup:
if (dnsseckey != NULL)
dst_key_free(&dnsseckey);
dns_rdataset_disassociate(&mykeyrdataset);
return (result);
}
isc_result_t
sigchase_verify_sig_key(dns_name_t *name, dns_rdataset_t *rdataset,
dst_key_t *dnsseckey, dns_rdataset_t *sigrdataset)
{
dns_rdata_sig_t siginfo;
dns_rdataset_t myrdataset;
dns_rdataset_t mysigrdataset;
isc_result_t result;
dns_rdataset_init(&myrdataset);
dns_rdataset_clone(rdataset, &myrdataset);
dns_rdataset_init(&mysigrdataset);
dns_rdataset_clone(sigrdataset, &mysigrdataset);
result = dns_rdataset_first(&mysigrdataset);
check_result(result, "empty RRSIG dataset");
do {
dns_rdata_t sigrdata = DNS_RDATA_INIT;
dns_rdataset_current(&mysigrdataset, &sigrdata);
result = dns_rdata_tostruct(&sigrdata, &siginfo, NULL);
check_result(result, "sigrdata tostruct siginfo");
/*
* Test if the id of the DNSKEY is
* the id of the DNSKEY signer's
*/
if (siginfo.keyid == dst_key_id(dnsseckey)) {
result = dns_rdataset_first(&myrdataset);
check_result(result, "empty DS dataset");
result = dns_dnssec_verify(name, &myrdataset, dnsseckey,
ISC_FALSE, mctx, &sigrdata);
printf(";; VERIFYING ");
print_type(rdataset->type);
printf(" RRset for ");
dns_name_print(name, stdout);
printf(" with DNSKEY:%d: %s\n", dst_key_id(dnsseckey),
isc_result_totext(result));
if (result == ISC_R_SUCCESS)
goto cleanup;
}
} while (dns_rdataset_next(&mysigrdataset) == ISC_R_SUCCESS);
result = ISC_R_NOTFOUND;
cleanup:
dns_rdataset_disassociate(&myrdataset);
dns_rdataset_disassociate(&mysigrdataset);
return (result);
}
isc_result_t
sigchase_verify_ds(dns_name_t *name, dns_rdataset_t *keyrdataset,
dns_rdataset_t *dsrdataset)
{
dns_rdata_ds_t dsinfo;
dns_rdataset_t mydsrdataset;
dns_rdataset_t mykeyrdataset;
dst_key_t *dnsseckey = NULL;
isc_result_t result;
unsigned char dsbuf[DNS_DS_BUFFERSIZE];
dns_rdataset_init(&mydsrdataset);
dns_rdataset_clone(dsrdataset, &mydsrdataset);
dns_rdataset_init(&mykeyrdataset);
dns_rdataset_clone(keyrdataset, &mykeyrdataset);
result = dns_rdataset_first(&mydsrdataset);
check_result(result, "empty DSset dataset");
do {
dns_rdata_t dsrdata = DNS_RDATA_INIT;
dns_rdataset_current(&mydsrdataset, &dsrdata);
result = dns_rdata_tostruct(&dsrdata, &dsinfo, NULL);
check_result(result, "dns_rdata_tostruct for DS");
result = dns_rdataset_first(&mykeyrdataset);
check_result(result, "empty KEY dataset");
do {
dns_rdata_t keyrdata = DNS_RDATA_INIT;
dns_rdataset_current(&mykeyrdataset, &keyrdata);
INSIST(keyrdata.type == dns_rdatatype_dnskey);
result = dns_dnssec_keyfromrdata(name, &keyrdata,
mctx, &dnsseckey);
check_result(result, "dns_dnssec_keyfromrdata");
/*
* Test if the id of the DNSKEY is the
* id of DNSKEY referenced by the DS
*/
if (dsinfo.key_tag == dst_key_id(dnsseckey)) {
dns_rdata_t newdsrdata = DNS_RDATA_INIT;
result = dns_ds_buildrdata(name, &keyrdata,
dsinfo.digest_type,
dsbuf, &newdsrdata);
dns_rdata_freestruct(&dsinfo);
if (result != ISC_R_SUCCESS) {
printf("Oops: impossible to build"
" new DS rdata\n");
goto cleanup;
}
if (dns_rdata_compare(&dsrdata,
&newdsrdata) == 0) {
printf(";; OK a DS valids a DNSKEY"
" in the RRset\n");
printf(";; Now verify that this"
" DNSKEY validates the "
"DNSKEY RRset\n");
result = sigchase_verify_sig_key(name,
keyrdataset,
dnsseckey,
chase_sigkeyrdataset);
if (result == ISC_R_SUCCESS)
goto cleanup;
} else {
printf(";; This DS is NOT the DS for"
" the chasing KEY: FAILED\n");
}
}
dst_key_free(&dnsseckey);
} while (dns_rdataset_next(&mykeyrdataset) == ISC_R_SUCCESS);
} while (dns_rdataset_next(&mydsrdataset) == ISC_R_SUCCESS);
result = ISC_R_NOTFOUND;
cleanup:
if (dnsseckey != NULL)
dst_key_free(&dnsseckey);
dns_rdataset_disassociate(&mydsrdataset);
dns_rdataset_disassociate(&mykeyrdataset);
return (result);
}
/*
*
* take a pointer on a rdataset in parameter and try to resolv it.
* the searched rrset is a rrset on 'name' with type 'type'
* (and if the type is a rrsig the signature cover 'covers').
* the lookedup is to known if you have already done the query on the net.
* ISC_R_SUCCESS: if we found the rrset
* ISC_R_NOTFOUND: we do not found the rrset in cache
* and we do a query on the net
* ISC_R_FAILURE: rrset not found
*/
isc_result_t
advanced_rrsearch(dns_rdataset_t **rdataset, dns_name_t *name,
dns_rdatatype_t type, dns_rdatatype_t covers,
isc_boolean_t *lookedup)
{
isc_boolean_t tmplookedup;
INSIST(rdataset != NULL);
if (*rdataset != NULL)
return (ISC_R_SUCCESS);
tmplookedup = *lookedup;
if ((*rdataset = sigchase_scanname(type, covers,
lookedup, name)) == NULL) {
if (tmplookedup)
return (ISC_R_FAILURE);
return (ISC_R_NOTFOUND);
}
*lookedup = ISC_FALSE;
return (ISC_R_SUCCESS);
}
#if DIG_SIGCHASE_TD
void
sigchase_td(dns_message_t *msg)
{
isc_result_t result;
dns_name_t *name = NULL;
isc_boolean_t have_answer = ISC_FALSE;
isc_boolean_t true = ISC_TRUE;
if (msg->rcode != dns_rcode_noerror &&
msg->rcode != dns_rcode_nxdomain) {
char buf[20];
isc_buffer_t b;
isc_buffer_init(&b, buf, sizeof(buf));
result = dns_rcode_totext(msg->rcode, &b);
check_result(result, "dns_rcode_totext failed");
printf("error response code %.*s\n",
(int)isc_buffer_usedlength(&b), buf);
error_message = msg;
return;
}
if ((result = dns_message_firstname(msg, DNS_SECTION_ANSWER))
== ISC_R_SUCCESS) {
dns_message_currentname(msg, DNS_SECTION_ANSWER, &name);
if (current_lookup->trace_root_sigchase) {
initialization(name);
return;
}
have_answer = true;
} else {
if (!current_lookup->trace_root_sigchase) {
result = dns_message_firstname(msg,
DNS_SECTION_AUTHORITY);
if (result != ISC_R_SUCCESS) {
printf("no answer or authority section\n");
error_message = msg;
return;
}
dns_message_currentname(msg, DNS_SECTION_AUTHORITY,
&name);
chase_nsrdataset
= chase_scanname_section(msg, name,
dns_rdatatype_ns,
dns_rdatatype_any,
DNS_SECTION_AUTHORITY);
dup_name(name, &chase_authority_name);
if (chase_nsrdataset != NULL) {
have_delegation_ns = ISC_TRUE;
printf("no response but there is a delegation"
" in authority section: ");
dns_name_print(name, stdout);
printf("\n");
} else {
printf("no response and no delegation in "
"authority section but a reference"
" to: ");
dns_name_print(name, stdout);
printf("\n");
error_message = msg;
}
} else {
printf(";; NO ANSWERS: %s\n",
isc_result_totext(result));
free_name(&chase_name);
clean_trustedkey();
return;
}
}
if (have_answer) {
chase_rdataset
= chase_scanname_section(msg, &chase_name,
current_lookup
->rdtype_sigchase,
dns_rdatatype_any,
DNS_SECTION_ANSWER);
if (chase_rdataset != NULL)
have_response = ISC_TRUE;
}
result = advanced_rrsearch(&chase_keyrdataset,
&chase_current_name,
dns_rdatatype_dnskey,
dns_rdatatype_any,
&chase_keylookedup);
if (result == ISC_R_FAILURE) {
printf("\n;; DNSKEY is missing to continue validation:"
" FAILED\n\n");
goto cleanandgo;
}
if (result == ISC_R_NOTFOUND)
return;
INSIST(chase_keyrdataset != NULL);
printf("\n;; DNSKEYset:\n");
print_rdataset(&chase_current_name , chase_keyrdataset);
result = advanced_rrsearch(&chase_sigkeyrdataset,
&chase_current_name,
dns_rdatatype_rrsig,
dns_rdatatype_dnskey,
&chase_sigkeylookedup);
if (result == ISC_R_FAILURE) {
printf("\n;; RRSIG of DNSKEY is missing to continue validation:"
" FAILED\n\n");
goto cleanandgo;
}
if (result == ISC_R_NOTFOUND)
return;
INSIST(chase_sigkeyrdataset != NULL);
printf("\n;; RRSIG of the DNSKEYset:\n");
print_rdataset(&chase_current_name , chase_sigkeyrdataset);
if (!chase_dslookedup && !chase_nslookedup) {
if (!delegation_follow) {
result = contains_trusted_key(&chase_current_name,
chase_keyrdataset,
chase_sigkeyrdataset);
} else {
INSIST(chase_dsrdataset != NULL);
INSIST(chase_sigdsrdataset != NULL);
result = sigchase_verify_ds(&chase_current_name,
chase_keyrdataset,
chase_dsrdataset);
}
if (result != ISC_R_SUCCESS) {
printf("\n;; chain of trust can't be validated:"
" FAILED\n\n");
goto cleanandgo;
} else {
chase_dsrdataset = NULL;
chase_sigdsrdataset = NULL;
}
}
if (have_response || (!have_delegation_ns && !have_response)) {
/* test if it's a grand father case */
if (have_response) {
result = advanced_rrsearch(&chase_sigrdataset,
&chase_name,
dns_rdatatype_rrsig,
current_lookup
->rdtype_sigchase,
&true);
if (result == ISC_R_FAILURE) {
printf("\n;; RRset is missing to continue"
" validation SHOULD NOT APPEND:"
" FAILED\n\n");
goto cleanandgo;
}
} else {
result = advanced_rrsearch(&chase_sigrdataset,
&chase_authority_name,
dns_rdatatype_rrsig,
dns_rdatatype_any,
&true);
if (result == ISC_R_FAILURE) {
printf("\n;; RRSIG is missing to continue"
" validation SHOULD NOT APPEND:"
" FAILED\n\n");
goto cleanandgo;
}
}
result = grandfather_pb_test(&chase_current_name,
chase_sigrdataset);
if (result != ISC_R_SUCCESS) {
dns_name_t tmp_name;
printf("\n;; We are in a Grand Father Problem:"
" See 2.2.1 in RFC 3658\n");
chase_rdataset = NULL;
chase_sigrdataset = NULL;
have_response = ISC_FALSE;
have_delegation_ns = ISC_FALSE;
dns_name_init(&tmp_name, NULL);
result = child_of_zone(&chase_name, &chase_current_name,
&tmp_name);
if (dns_name_dynamic(&chase_authority_name))
free_name(&chase_authority_name);
dup_name(&tmp_name, &chase_authority_name);
printf(";; and we try to continue chain of trust"
" validation of the zone: ");
dns_name_print(&chase_authority_name, stdout);
printf("\n");
have_delegation_ns = ISC_TRUE;
} else {
if (have_response)
goto finalstep;
else
chase_sigrdataset = NULL;
}
}
if (have_delegation_ns) {
chase_nsrdataset = NULL;
result = advanced_rrsearch(&chase_nsrdataset,
&chase_authority_name,
dns_rdatatype_ns,
dns_rdatatype_any,
&chase_nslookedup);
if (result == ISC_R_FAILURE) {
printf("\n;;NSset is missing to continue validation:"
" FAILED\n\n");
goto cleanandgo;
}
if (result == ISC_R_NOTFOUND) {
return;
}
INSIST(chase_nsrdataset != NULL);
result = advanced_rrsearch(&chase_dsrdataset,
&chase_authority_name,
dns_rdatatype_ds,
dns_rdatatype_any,
&chase_dslookedup);
if (result == ISC_R_FAILURE) {
printf("\n;; DSset is missing to continue validation:"
" FAILED\n\n");
goto cleanandgo;
}
if (result == ISC_R_NOTFOUND)
return;
INSIST(chase_dsrdataset != NULL);
printf("\n;; DSset:\n");
print_rdataset(&chase_authority_name , chase_dsrdataset);
result = advanced_rrsearch(&chase_sigdsrdataset,
&chase_authority_name,
dns_rdatatype_rrsig,
dns_rdatatype_ds,
&true);
if (result != ISC_R_SUCCESS) {
printf("\n;; DSset is missing to continue validation:"
" FAILED\n\n");
goto cleanandgo;
}
printf("\n;; RRSIGset of DSset\n");
print_rdataset(&chase_authority_name, chase_sigdsrdataset);
INSIST(chase_sigdsrdataset != NULL);
result = sigchase_verify_sig(&chase_authority_name,
chase_dsrdataset,
chase_keyrdataset,
chase_sigdsrdataset);
if (result != ISC_R_SUCCESS) {
printf("\n;; Impossible to verify the DSset:"
" FAILED\n\n");
goto cleanandgo;
}
chase_keyrdataset = NULL;
chase_sigkeyrdataset = NULL;
prepare_lookup(&chase_authority_name);
have_response = ISC_FALSE;
have_delegation_ns = ISC_FALSE;
delegation_follow = ISC_TRUE;
error_message = NULL;
dup_name(&chase_authority_name, &chase_current_name);
free_name(&chase_authority_name);
return;
}
if (error_message != NULL) {
dns_rdataset_t *rdataset;
dns_rdataset_t *sigrdataset;
dns_name_t rdata_name;
isc_result_t ret = ISC_R_FAILURE;
dns_name_init(&rdata_name, NULL);
result = prove_nx(error_message, &chase_name,
current_lookup->rdclass_sigchase,
current_lookup->rdtype_sigchase, &rdata_name,
&rdataset, &sigrdataset);
if (rdataset == NULL || sigrdataset == NULL ||
dns_name_countlabels(&rdata_name) == 0) {
printf("\n;; Impossible to verify the non-existence,"
" the NSEC RRset can't be validated:"
" FAILED\n\n");
goto cleanandgo;
}
ret = sigchase_verify_sig(&rdata_name, rdataset,
chase_keyrdataset,
sigrdataset);
if (ret != ISC_R_SUCCESS) {
free_name(&rdata_name);
printf("\n;; Impossible to verify the NSEC RR to prove"
" the non-existence : FAILED\n\n");
goto cleanandgo;
}
free_name(&rdata_name);
if (result != ISC_R_SUCCESS) {
printf("\n;; Impossible to verify the non-existence:"
" FAILED\n\n");
goto cleanandgo;
} else {
printf("\n;; OK the query doesn't have response but"
" we have validate this fact : SUCCESS\n\n");
goto cleanandgo;
}
}
cleanandgo:
printf(";; cleanandgo \n");
if (dns_name_dynamic(&chase_current_name))
free_name(&chase_current_name);
if (dns_name_dynamic(&chase_authority_name))
free_name(&chase_authority_name);
clean_trustedkey();
return;
finalstep :
result = advanced_rrsearch(&chase_rdataset, &chase_name,
current_lookup->rdtype_sigchase,
dns_rdatatype_any ,
&true);
if (result == ISC_R_FAILURE) {
printf("\n;; RRsig of RRset is missing to continue validation"
" SHOULD NOT APPEND: FAILED\n\n");
goto cleanandgo;
}
result = sigchase_verify_sig(&chase_name, chase_rdataset,
chase_keyrdataset,
chase_sigrdataset);
if (result != ISC_R_SUCCESS) {
printf("\n;; Impossible to verify the RRset : FAILED\n\n");
/*
printf("RRset:\n");
print_rdataset(&chase_name , chase_rdataset);
printf("DNSKEYset:\n");
print_rdataset(&chase_name , chase_keyrdataset);
printf("RRSIG of RRset:\n");
print_rdataset(&chase_name , chase_sigrdataset);
printf("\n");
*/
goto cleanandgo;
} else {
printf("\n;; The Answer:\n");
print_rdataset(&chase_name , chase_rdataset);
printf("\n;; FINISH : we have validate the DNSSEC chain"
" of trust: SUCCESS\n\n");
goto cleanandgo;
}
}
#endif
#if DIG_SIGCHASE_BU
isc_result_t
getneededrr(dns_message_t *msg)
{
isc_result_t result;
dns_name_t *name = NULL;
dns_rdata_t sigrdata = DNS_RDATA_INIT;
dns_rdata_sig_t siginfo;
isc_boolean_t true = ISC_TRUE;
if ((result = dns_message_firstname(msg, DNS_SECTION_ANSWER))
!= ISC_R_SUCCESS) {
printf(";; NO ANSWERS: %s\n", isc_result_totext(result));
if (chase_name.ndata == NULL)
return (ISC_R_ADDRNOTAVAIL);
} else {
dns_message_currentname(msg, DNS_SECTION_ANSWER, &name);
}
/* What do we chase? */
if (chase_rdataset == NULL) {
result = advanced_rrsearch(&chase_rdataset, name,
dns_rdatatype_any,
dns_rdatatype_any, &true);
if (result != ISC_R_SUCCESS) {
printf("\n;; No Answers: Validation FAILED\n\n");
return (ISC_R_NOTFOUND);
}
dup_name(name, &chase_name);
printf(";; RRset to chase:\n");
print_rdataset(&chase_name, chase_rdataset);
}
INSIST(chase_rdataset != NULL);
if (chase_sigrdataset == NULL) {
result = advanced_rrsearch(&chase_sigrdataset, name,
dns_rdatatype_rrsig,
chase_rdataset->type,
&chase_siglookedup);
if (result == ISC_R_FAILURE) {
printf("\n;; RRSIG is missing for continue validation:"
" FAILED\n\n");
if (dns_name_dynamic(&chase_name))
free_name(&chase_name);
return (ISC_R_NOTFOUND);
}
if (result == ISC_R_NOTFOUND) {
return (ISC_R_NOTFOUND);
}
printf("\n;; RRSIG of the RRset to chase:\n");
print_rdataset(&chase_name, chase_sigrdataset);
}
INSIST(chase_sigrdataset != NULL);
/* first find the DNSKEY name */
result = dns_rdataset_first(chase_sigrdataset);
check_result(result, "empty RRSIG dataset");
dns_rdataset_current(chase_sigrdataset, &sigrdata);
result = dns_rdata_tostruct(&sigrdata, &siginfo, NULL);
check_result(result, "sigrdata tostruct siginfo");
dup_name(&siginfo.signer, &chase_signame);
dns_rdata_freestruct(&siginfo);
dns_rdata_reset(&sigrdata);
/* Do we have a key? */
if (chase_keyrdataset == NULL) {
result = advanced_rrsearch(&chase_keyrdataset,
&chase_signame,
dns_rdatatype_dnskey,
dns_rdatatype_any,
&chase_keylookedup);
if (result == ISC_R_FAILURE) {
printf("\n;; DNSKEY is missing to continue validation:"
" FAILED\n\n");
free_name(&chase_signame);
if (dns_name_dynamic(&chase_name))
free_name(&chase_name);
return (ISC_R_NOTFOUND);
}
if (result == ISC_R_NOTFOUND) {
free_name(&chase_signame);
return (ISC_R_NOTFOUND);
}
printf("\n;; DNSKEYset that signs the RRset to chase:\n");
print_rdataset(&chase_signame, chase_keyrdataset);
}
INSIST(chase_keyrdataset != NULL);
if (chase_sigkeyrdataset == NULL) {
result = advanced_rrsearch(&chase_sigkeyrdataset,
&chase_signame,
dns_rdatatype_rrsig,
dns_rdatatype_dnskey,
&chase_sigkeylookedup);
if (result == ISC_R_FAILURE) {
printf("\n;; RRSIG for DNSKEY is missing to continue"
" validation : FAILED\n\n");
free_name(&chase_signame);
if (dns_name_dynamic(&chase_name))
free_name(&chase_name);
return (ISC_R_NOTFOUND);
}
if (result == ISC_R_NOTFOUND) {
free_name(&chase_signame);
return (ISC_R_NOTFOUND);
}
printf("\n;; RRSIG of the DNSKEYset that signs the "
"RRset to chase:\n");
print_rdataset(&chase_signame, chase_sigkeyrdataset);
}
INSIST(chase_sigkeyrdataset != NULL);
if (chase_dsrdataset == NULL) {
result = advanced_rrsearch(&chase_dsrdataset, &chase_signame,
dns_rdatatype_ds, dns_rdatatype_any,
&chase_dslookedup);
if (result == ISC_R_FAILURE) {
printf("\n;; WARNING There is no DS for the zone: ");
dns_name_print(&chase_signame, stdout);
printf("\n");
}
if (result == ISC_R_NOTFOUND) {
free_name(&chase_signame);
return (ISC_R_NOTFOUND);
}
if (chase_dsrdataset != NULL) {
printf("\n;; DSset of the DNSKEYset\n");
print_rdataset(&chase_signame, chase_dsrdataset);
}
}
if (chase_dsrdataset != NULL) {
/*
* if there is no RRSIG of DS,
* we don't want to search on the network
*/
result = advanced_rrsearch(&chase_sigdsrdataset,
&chase_signame,
dns_rdatatype_rrsig,
dns_rdatatype_ds, &true);
if (result == ISC_R_FAILURE) {
printf(";; WARNING : NO RRSIG DS : RRSIG DS"
" should come with DS\n");
/*
* We continue even the DS couldn't be validated,
* because the DNSKEY could be a Trusted Key.
*/
chase_dsrdataset = NULL;
} else {
printf("\n;; RRSIG of the DSset of the DNSKEYset\n");
print_rdataset(&chase_signame, chase_sigdsrdataset);
}
}
return (1);
}
void
sigchase_bu(dns_message_t *msg)
{
isc_result_t result;
int ret;
if (tk_list.nb_tk == 0) {
result = get_trusted_key();
if (result != ISC_R_SUCCESS) {
printf("No trusted keys present\n");
return;
}
}
ret = getneededrr(msg);
if (ret == ISC_R_NOTFOUND)
return;
if (ret == ISC_R_ADDRNOTAVAIL) {
/* We have no response */
dns_rdataset_t *rdataset;
dns_rdataset_t *sigrdataset;
dns_name_t rdata_name;
dns_name_t query_name;
dns_name_init(&query_name, NULL);
dns_name_init(&rdata_name, NULL);
nameFromString(current_lookup->textname, &query_name);
result = prove_nx(msg, &query_name, current_lookup->rdclass,
current_lookup->rdtype, &rdata_name,
&rdataset, &sigrdataset);
free_name(&query_name);
if (rdataset == NULL || sigrdataset == NULL ||
dns_name_countlabels(&rdata_name) == 0) {
printf("\n;; Impossible to verify the Non-existence,"
" the NSEC RRset can't be validated: "
"FAILED\n\n");
clean_trustedkey();
return;
}
if (result != ISC_R_SUCCESS) {
printf("\n No Answers and impossible to prove the"
" unsecurity : Validation FAILED\n\n");
clean_trustedkey();
return;
}
printf(";; An NSEC prove the non-existence of a answers,"
" Now we want validate this NSEC\n");
dup_name(&rdata_name, &chase_name);
free_name(&rdata_name);
chase_rdataset = rdataset;
chase_sigrdataset = sigrdataset;
chase_keyrdataset = NULL;
chase_sigkeyrdataset = NULL;
chase_dsrdataset = NULL;
chase_sigdsrdataset = NULL;
chase_siglookedup = ISC_FALSE;
chase_keylookedup = ISC_FALSE;
chase_dslookedup = ISC_FALSE;
chase_sigdslookedup = ISC_FALSE;
sigchase(msg);
clean_trustedkey();
return;
}
printf("\n\n\n;; WE HAVE MATERIAL, WE NOW DO VALIDATION\n");
result = sigchase_verify_sig(&chase_name, chase_rdataset,
chase_keyrdataset,
chase_sigrdataset);
if (result != ISC_R_SUCCESS) {
free_name(&chase_name);
free_name(&chase_signame);
printf(";; No DNSKEY is valid to check the RRSIG"
" of the RRset: FAILED\n");
clean_trustedkey();
return;
}
printf(";; OK We found DNSKEY (or more) to validate the RRset\n");
result = contains_trusted_key(&chase_signame, chase_keyrdataset,
chase_sigkeyrdataset);
if (result == ISC_R_SUCCESS) {
free_name(&chase_name);
free_name(&chase_signame);
printf("\n;; Ok this DNSKEY is a Trusted Key,"
" DNSSEC validation is ok: SUCCESS\n\n");
clean_trustedkey();
return;
}
printf(";; Now, we are going to validate this DNSKEY by the DS\n");
if (chase_dsrdataset == NULL) {
free_name(&chase_name);
free_name(&chase_signame);
printf(";; the DNSKEY isn't trusted-key and there isn't"
" DS to validate the DNSKEY: FAILED\n");
clean_trustedkey();
return;
}
result = sigchase_verify_ds(&chase_signame, chase_keyrdataset,
chase_dsrdataset);
if (result != ISC_R_SUCCESS) {
free_name(&chase_signame);
free_name(&chase_name);
printf(";; ERROR no DS validates a DNSKEY in the"
" DNSKEY RRset: FAILED\n");
clean_trustedkey();
return;
} else
printf(";; OK this DNSKEY (validated by the DS) validates"
" the RRset of the DNSKEYs, thus the DNSKEY validates"
" the RRset\n");
INSIST(chase_sigdsrdataset != NULL);
dup_name(&chase_signame, &chase_name);
free_name(&chase_signame);
chase_rdataset = chase_dsrdataset;
chase_sigrdataset = chase_sigdsrdataset;
chase_keyrdataset = NULL;
chase_sigkeyrdataset = NULL;
chase_dsrdataset = NULL;
chase_sigdsrdataset = NULL;
chase_siglookedup = chase_keylookedup = ISC_FALSE;
chase_dslookedup = chase_sigdslookedup = ISC_FALSE;
printf(";; Now, we want to validate the DS : recursive call\n");
sigchase(msg);
return;
}
#endif
void
sigchase(dns_message_t *msg) {
#if DIG_SIGCHASE_TD
if (current_lookup->do_topdown) {
sigchase_td(msg);
return;
}
#endif
#if DIG_SIGCHASE_BU
sigchase_bu(msg);
return;
#endif
}
/*
* return 1 if name1 < name2
* 0 if name1 == name2
* -1 if name1 > name2
* and -2 if problem
*/
int
inf_name(dns_name_t *name1, dns_name_t *name2)
{
dns_label_t label1;
dns_label_t label2;
unsigned int nblabel1;
unsigned int nblabel2;
int min_lum_label;
int i;
int ret = -2;
nblabel1 = dns_name_countlabels(name1);
nblabel2 = dns_name_countlabels(name2);
if (nblabel1 >= nblabel2)
min_lum_label = nblabel2;
else
min_lum_label = nblabel1;
for (i=1 ; i < min_lum_label; i++) {
dns_name_getlabel(name1, nblabel1 -1 - i, &label1);
dns_name_getlabel(name2, nblabel2 -1 - i, &label2);
if ((ret = isc_region_compare(&label1, &label2)) != 0) {
if (ret < 0)
return (-1);
else if (ret > 0)
return (1);
}
}
if (nblabel1 == nblabel2)
return (0);
if (nblabel1 < nblabel2)
return (-1);
else
return (1);
}
/**
*
*
*
*/
isc_result_t
prove_nx_domain(dns_message_t *msg,
dns_name_t *name,
dns_name_t *rdata_name,
dns_rdataset_t **rdataset,
dns_rdataset_t **sigrdataset)
{
isc_result_t ret = ISC_R_FAILURE;
isc_result_t result = ISC_R_NOTFOUND;
dns_rdataset_t *nsecset = NULL;
dns_rdataset_t *signsecset = NULL ;
dns_rdata_t nsec = DNS_RDATA_INIT;
dns_name_t *nsecname;
dns_rdata_nsec_t nsecstruct;
if ((result = dns_message_firstname(msg, DNS_SECTION_AUTHORITY))
!= ISC_R_SUCCESS) {
printf(";; nothing in authority section : impossible to"
" validate the non-existence : FAILED\n");
return (ISC_R_FAILURE);
}
do {
nsecname = NULL;
dns_message_currentname(msg, DNS_SECTION_AUTHORITY, &nsecname);
nsecset = search_type(nsecname, dns_rdatatype_nsec,
dns_rdatatype_any);
if (nsecset == NULL)
continue;
printf("There is a NSEC for this zone in the"
" AUTHORITY section:\n");
print_rdataset(nsecname, nsecset);
for (result = dns_rdataset_first(nsecset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(nsecset)) {
dns_rdataset_current(nsecset, &nsec);
signsecset
= chase_scanname_section(msg, nsecname,
dns_rdatatype_rrsig,
dns_rdatatype_nsec,
DNS_SECTION_AUTHORITY);
if (signsecset == NULL) {
printf(";; no RRSIG NSEC in authority section:"
" impossible to validate the "
"non-existence: FAILED\n");
return (ISC_R_FAILURE);
}
ret = dns_rdata_tostruct(&nsec, &nsecstruct, NULL);
check_result(ret,"dns_rdata_tostruct");
if ((inf_name(nsecname, &nsecstruct.next) == 1 &&
inf_name(name, &nsecstruct.next) == 1) ||
(inf_name(name, nsecname) == 1 &&
inf_name(&nsecstruct.next, name) == 1)) {
dns_rdata_freestruct(&nsecstruct);
*rdataset = nsecset;
*sigrdataset = signsecset;
dup_name(nsecname, rdata_name);
return (ISC_R_SUCCESS);
}
dns_rdata_freestruct(&nsecstruct);
dns_rdata_reset(&nsec);
}
} while (dns_message_nextname(msg, DNS_SECTION_AUTHORITY)
== ISC_R_SUCCESS);
*rdataset = NULL;
*sigrdataset = NULL;
rdata_name = NULL;
return (ISC_R_FAILURE);
}
/**
*
*
*
*
*
*/
isc_result_t
prove_nx_type(dns_message_t *msg, dns_name_t *name, dns_rdataset_t *nsecset,
dns_rdataclass_t class, dns_rdatatype_t type,
dns_name_t *rdata_name, dns_rdataset_t **rdataset,
dns_rdataset_t **sigrdataset)
{
isc_result_t ret;
dns_rdataset_t *signsecset;
dns_rdata_t nsec = DNS_RDATA_INIT;
UNUSED(class);
ret = dns_rdataset_first(nsecset);
check_result(ret,"dns_rdataset_first");
dns_rdataset_current(nsecset, &nsec);
ret = dns_nsec_typepresent(&nsec, type);
if (ret == ISC_R_SUCCESS)
printf("OK the NSEC said that the type doesn't exist \n");
signsecset = chase_scanname_section(msg, name,
dns_rdatatype_rrsig,
dns_rdatatype_nsec,
DNS_SECTION_AUTHORITY);
if (signsecset == NULL) {
printf("There isn't RRSIG NSEC for the zone \n");
return (ISC_R_FAILURE);
}
dup_name(name, rdata_name);
*rdataset = nsecset;
*sigrdataset = signsecset;
return (ret);
}
/**
*
*
*
*
*/
isc_result_t
prove_nx(dns_message_t *msg, dns_name_t *name, dns_rdataclass_t class,
dns_rdatatype_t type, dns_name_t *rdata_name,
dns_rdataset_t **rdataset, dns_rdataset_t **sigrdataset)
{
isc_result_t ret;
dns_rdataset_t *nsecset = NULL;
printf("We want to prove the non-existence of a type of rdata %d"
" or of the zone: \n", type);
if ((ret = dns_message_firstname(msg, DNS_SECTION_AUTHORITY))
!= ISC_R_SUCCESS) {
printf(";; nothing in authority section : impossible to"
" validate the non-existence : FAILED\n");
return (ISC_R_FAILURE);
}
nsecset = chase_scanname_section(msg, name, dns_rdatatype_nsec,
dns_rdatatype_any,
DNS_SECTION_AUTHORITY);
if (nsecset != NULL) {
printf("We have a NSEC for this zone :OK\n");
ret = prove_nx_type(msg, name, nsecset, class,
type, rdata_name, rdataset,
sigrdataset);
if (ret != ISC_R_SUCCESS) {
printf("prove_nx: ERROR type exist\n");
return (ret);
} else {
printf("prove_nx: OK type does not exist\n");
return (ISC_R_SUCCESS);
}
} else {
printf("there is no NSEC for this zone: validating "
"that the zone doesn't exist\n");
ret = prove_nx_domain(msg, name, rdata_name,
rdataset, sigrdataset);
return (ret);
}
/* Never get here */
}
#endif