#include <config.h>

#include <isc/base64.h>

#include <isc/buffer.h>

#include <isc/condition.h>

#include <isc/commandline.h>

#include <isc/entropy.h>

#include <isc/lex.h>

#include <isc/mem.h>

#include <isc/mutex.h>

#include <isc/region.h>

#include <isc/sockaddr.h>

#include <isc/socket.h>

#include <isc/string.h>

#include <isc/task.h>

#include <isc/timer.h>

#include <isc/types.h>

#include <isc/util.h>

#include <dns/callbacks.h>

#include <dns/dispatch.h>

#include <dns/events.h>

#include <dns/message.h>

#include <dns/name.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/request.h>

#include <dns/result.h>

#include <dns/tsig.h>

#include <dst/dst.h>

#include <lwres/lwres.h>

#include <lwres/net.h>

#include <ctype.h>

#include <netdb.h>

#include <stdlib.h>

#include <unistd.h>

#define MXNAME 256

#define MAXPNAME 1025

#define MAXCMD 1024

#define NAMEBUF 512

#define WORDLEN 512

#define PACKETSIZE 2048

#define MSGTEXT 4096

#define FIND_TIMEOUT 5

#define DNSDEFAULTPORT 53

#define RESOLV_CONF "/etc/resolv.conf"

static isc_boolean_t busy = ISC_FALSE;

static isc_boolean_t debugging = ISC_FALSE, ddebugging = ISC_FALSE;

static isc_boolean_t have_ipv6 = ISC_FALSE;

static isc_boolean_t is_dst_up = ISC_FALSE;

static isc_boolean_t usevc = ISC_FALSE;

static isc_mutex_t lock;

static isc_condition_t cond;

static isc_taskmgr_t *taskmgr = NULL;

static isc_task_t *global_task = NULL;

static isc_mem_t *mctx = NULL;

static dns_dispatchmgr_t *dispatchmgr = NULL;

static dns_requestmgr_t *requestmgr = NULL;

static isc_socketmgr_t *socketmgr = NULL;

static isc_timermgr_t *timermgr = NULL;

static dns_dispatch_t *dispatchv4 = NULL;

static dns_message_t *updatemsg = NULL;

static dns_fixedname_t resolvdomain; /* from resolv.conf's domain line */

static dns_name_t *origin; /* Points to one of above, or dns_rootname */

static dns_fixedname_t fuserzone;

static dns_name_t *userzone = NULL;

static dns_tsigkey_t *key = NULL;

static lwres_context_t *lwctx = NULL;

static lwres_conf_t *lwconf;

static isc_sockaddr_t *servers;

static int ns_inuse = 0;

static int ns_total = 0;

static isc_sockaddr_t *userserver = NULL;

static char *keystr = NULL, *keyfile = NULL;

static isc_entropy_t *entp = NULL;

typedef struct nsu_requestinfo {

dns_message_t *msg;

isc_sockaddr_t *addr;

} nsu_requestinfo_t;

static void sendrequest(isc_sockaddr_t *address, dns_message_t *msg,

dns_request_t **request);

#define STATUS_MORE 0

#define STATUS_SEND 1

#define STATUS_QUIT 2

#define STATUS_SYNTAX 3

static void

fatal(const char *format, ...) {

va_list args;

va_start(args, format);

vfprintf(stderr, format, args);

va_end(args);

fprintf(stderr, "\n");

exit(1);

}

static void

debug(const char *format, ...) {

va_list args;

if (debugging) {

va_start(args, format);

vfprintf(stderr, format, args);

va_end(args);

fprintf(stderr, "\n");

}

}

static void

ddebug(const char *format, ...) {

va_list args;

if (ddebugging) {

va_start(args, format);

vfprintf(stderr, format, args);

va_end(args);

fprintf(stderr, "\n");

}

}

static inline void

check_result(isc_result_t result, const char *msg) {

if (result != ISC_R_SUCCESS)

fatal("%s: %s", msg, isc_result_totext(result));

}

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);

}

static char *

nsu_strsep(char **stringp, const char *delim) {

char *string = *stringp;

char *s;

const char *d;

char sc, dc;

if (string == NULL)

return (NULL);

for (; *string != '\0'; string++) {

sc = *string;

for (d = delim; (dc = *d) != '\0'; d++) {

if (sc == dc)

break;

}

if (dc == 0)

break;

}

for (s = string; *s != '\0'; s++) {

sc = *s;

for (d = delim; (dc = *d) != '\0'; d++) {

if (sc == dc) {

*s++ = '\0';

*stringp = s;

return (string);

}

}

}

*stringp = NULL;

return (string);

}

static unsigned int

count_dots(char *s, isc_boolean_t *last_was_dot) {

int i = 0;

*last_was_dot = ISC_FALSE;

while (*s != 0) {

if (*s++ == '.') {

i++;

*last_was_dot = ISC_TRUE;

} else

*last_was_dot = ISC_FALSE;

}

return (i);

}

static void

reset_system(void) {

isc_result_t result;

ddebug("reset_system()");

/* If the update message is still around, destroy it */

if (updatemsg != NULL)

dns_message_reset(updatemsg, DNS_MESSAGE_INTENTRENDER);

else {

result = dns_message_create(mctx, DNS_MESSAGE_INTENTRENDER,

&updatemsg);

check_result(result, "dns_message_create");

}

updatemsg->opcode = dns_opcode_update;

}

static void

setup_key() {

unsigned char *secret = NULL;

int secretlen;

isc_buffer_t secretbuf;

isc_result_t result;

dns_fixedname_t fkeyname;

dns_name_t *keyname;

if (keystr != NULL) {

isc_buffer_t keynamesrc;

char *secretstr;

char *s;

debug("Creating key...");

s = strchr(keystr, ':');

if (s == NULL || s == keystr || *s == 0)

fatal("key option must specify keyname:secret\n");

secretstr = s + 1;

dns_fixedname_init(&fkeyname);

keyname = dns_fixedname_name(&fkeyname);

isc_buffer_init(&keynamesrc, keystr, s - keystr);

isc_buffer_add(&keynamesrc, s - keystr);

debug("namefromtext");

result = dns_name_fromtext(keyname, &keynamesrc, dns_rootname,

ISC_FALSE, NULL);

check_result(result, "dns_name_fromtext");

secretlen = strlen(secretstr) * 3 / 4;

secret = isc_mem_allocate(mctx, secretlen);

if (secret == NULL)

fatal("out of memory");

isc_buffer_init(&secretbuf, secret, secretlen);

result = isc_base64_decodestring(mctx, secretstr, &secretbuf);

if (result != ISC_R_SUCCESS) {

fprintf(stderr, "Couldn't create key from %s: %s\n",

keystr, isc_result_totext(result));

goto failure;

}

secretlen = isc_buffer_usedlength(&secretbuf);

debug("close");

} else {

dst_key_t *dstkey = NULL;

result = dst_key_fromnamedfile(keyfile, DST_TYPE_PRIVATE,

mctx, &dstkey);

if (result != ISC_R_SUCCESS) {

fprintf(stderr, "Couldn't read key from %s: %s\n",

keyfile, isc_result_totext(result));

goto failure;

}

secretlen = (dst_key_size(dstkey) + 7) >> 3;

secret = isc_mem_allocate(mctx, secretlen);

if (secret == NULL)

fatal("out of memory");

isc_buffer_init(&secretbuf, secret, secretlen);

result = dst_key_tobuffer(dstkey, &secretbuf);

if (result != ISC_R_SUCCESS) {

fprintf(stderr, "Couldn't read key from %s: %s\n",

keyfile, isc_result_totext(result));

goto failure;

}

keyname = dst_key_name(dstkey);

}

debug("keycreate");

result = dns_tsigkey_create(keyname, dns_tsig_hmacmd5_name,

secret, secretlen, ISC_TRUE, NULL, 0, 0,

mctx, NULL, &key);

if (result != ISC_R_SUCCESS) {

char *str;

if (keystr != NULL)

str = keystr;

else

str = keyfile;

fprintf(stderr, "Couldn't create key from %s: %s\n",

str, dns_result_totext(result));

}

isc_mem_free(mctx, secret);

return;

failure:

if (secret != NULL)

isc_mem_free(mctx, secret);

}

static void

setup_system(void) {

isc_result_t result;

isc_sockaddr_t bind_any;

isc_buffer_t buf;

lwres_result_t lwresult;

int i;

ddebug("setup_system()");

result = isc_net_probeipv4();

check_result(result, "isc_net_probeipv4");

/* XXXMWS There isn't any actual V6 support in the code yet */

result = isc_net_probeipv6();

if (result == ISC_R_SUCCESS)

have_ipv6=ISC_TRUE;

result = isc_mem_create(0, 0, &mctx);

check_result(result, "isc_mem_create");

lwresult = lwres_context_create(&lwctx, mctx, mem_alloc, mem_free, 1);

if (lwresult != LWRES_R_SUCCESS)

fatal("lwres_context_create failed");

lwresult = lwres_conf_parse(lwctx, RESOLV_CONF);

if (lwresult != LWRES_R_SUCCESS)

fprintf(stderr,

"An error was encountered in /etc/resolv.conf\n");

lwconf = lwres_conf_get(lwctx);

ns_total = lwconf->nsnext;

if (ns_total <= 0)

fatal("no valid servers found");

servers = isc_mem_get(mctx, ns_total * sizeof(isc_sockaddr_t));

if (servers == NULL)

fatal("out of memory");

for (i = 0; i < ns_total; i++) {

if (lwconf->nameservers[i].family == LWRES_ADDRTYPE_V4) {

struct in_addr in4;

memcpy(&in4, lwconf->nameservers[i].address, 4);

isc_sockaddr_fromin(&servers[i], &in4, DNSDEFAULTPORT);

} else {

struct in6_addr in6;

memcpy(&in6, lwconf->nameservers[i].address, 16);

isc_sockaddr_fromin6(&servers[i], &in6,

DNSDEFAULTPORT);

}

}

result = dns_dispatchmgr_create(mctx, NULL, &dispatchmgr);

check_result(result, "dns_dispatchmgr_create");

result = isc_socketmgr_create(mctx, &socketmgr);

check_result(result, "dns_socketmgr_create");

result = isc_timermgr_create(mctx, &timermgr);

check_result(result, "dns_timermgr_create");

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");

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;

isc_sockaddr_any(&bind_any);

result = dns_dispatch_getudp(dispatchmgr, socketmgr, taskmgr,

&bind_any, PACKETSIZE, 4, 2, 3, 5,

DNS_DISPATCHATTR_UDP |

DNS_DISPATCHATTR_IPV4 |

DNS_DISPATCHATTR_MAKEQUERY, 0,

&dispatchv4);

check_result(result, "dns_dispatch_getudp");

result = dns_requestmgr_create(mctx, timermgr,

socketmgr, taskmgr, dispatchmgr,

dispatchv4, NULL, &requestmgr);

check_result(result, "dns_requestmgr_create");

if (lwconf->domainname != NULL) {

dns_fixedname_init(&resolvdomain);

isc_buffer_init(&buf, lwconf->domainname,

strlen(lwconf->domainname));

isc_buffer_add(&buf, strlen(lwconf->domainname));

result = dns_name_fromtext(dns_fixedname_name(&resolvdomain),

&buf, dns_rootname, ISC_FALSE,

NULL);

check_result(result, "dns_name_fromtext");

origin = dns_fixedname_name(&resolvdomain);

}

else

origin = dns_rootname;

if (keystr != NULL || keyfile != NULL)

setup_key();

}

static void

get_address(char *host, in_port_t port, isc_sockaddr_t *sockaddr) {

struct in_addr in4;

struct in6_addr in6;

struct hostent *he;

ddebug("get_address()");

if (have_ipv6 && inet_pton(AF_INET6, host, &in6) == 1)

isc_sockaddr_fromin6(sockaddr, &in6, port);

else if (inet_pton(AF_INET, host, &in4) == 1)

isc_sockaddr_fromin(sockaddr, &in4, port);

else {

he = gethostbyname(host);

if (he == NULL)

fatal("Couldn't look up your server host %s. errno=%d",

host, h_errno);

INSIST(he->h_addrtype == AF_INET);

isc_sockaddr_fromin(sockaddr,

(struct in_addr *)(he->h_addr_list[0]),

port);

}

}

static void

parse_args(int argc, char **argv) {

int ch;

debug("parse_args");

while ((ch = isc_commandline_parse(argc, argv, "dDMy:vk:")) != -1) {

switch (ch) {

case 'd':

debugging = ISC_TRUE;

break;

case 'D': /* was -dd */

debugging = ISC_TRUE;

ddebugging = ISC_TRUE;

break;

case 'M': /* was -dm */

debugging = ISC_TRUE;

ddebugging = ISC_TRUE;

isc_mem_debugging = ISC_TRUE;

break;

case 'y':

keystr = isc_commandline_argument;

break;

case 'v':

usevc = ISC_TRUE;

break;

case 'k':

keyfile = isc_commandline_argument;

break;

default:

fprintf(stderr, "%s: invalid argument -%c\n",

argv[0], ch);

fprintf(stderr, "usage: nsupdate [-d] "

"[-y keyname:secret | -k keyfile] [-v]\n");

exit(1);

}

}

if (keyfile != NULL && keystr != NULL) {

fprintf(stderr, "%s: cannot specify both -k and -y\n",

argv[0]);

exit(1);

}

}

static isc_uint16_t

parse_name(char **cmdlinep, dns_message_t *msg, dns_name_t **namep) {

isc_result_t result;

char *word;

isc_buffer_t *namebuf = NULL;

isc_buffer_t source;

unsigned int dots;

isc_boolean_t last;

dns_name_t *rn;

word = nsu_strsep(cmdlinep, " \t\r\n");

if (*word == 0) {

fprintf(stderr, "failed to read owner name\n");

return (STATUS_SYNTAX);

}

result = dns_message_gettempname(msg, namep);

check_result(result, "dns_message_gettempname");

result = isc_buffer_allocate(mctx, &namebuf, NAMEBUF);

check_result(result, "isc_buffer_allocate");

dns_name_init(*namep, NULL);

dns_name_setbuffer(*namep, namebuf);

dns_message_takebuffer(msg, &namebuf);

isc_buffer_init(&source, word, strlen(word));

isc_buffer_add(&source, strlen(word));

dots = count_dots(word, &last);

if (dots > lwconf->ndots || last)

rn = dns_rootname;

else if (userzone != NULL)

rn = userzone;

else

rn = origin;

result = dns_name_fromtext(*namep, &source, rn,

ISC_FALSE, NULL);

check_result(result, "dns_name_fromtext");

isc_buffer_invalidate(&source);

return (STATUS_MORE);

}

static isc_uint16_t

parse_rdata(char **cmdlinep, dns_rdataclass_t rdataclass,

dns_rdatatype_t rdatatype, dns_message_t *msg,

dns_rdata_t **rdatap)

{

char *cmdline = *cmdlinep;

isc_buffer_t source, *buf = NULL;

isc_lex_t *lex = NULL;

dns_rdatacallbacks_t callbacks;

isc_result_t result;

dns_name_t *rn;

while (*cmdline != 0 && isspace((unsigned char)*cmdline))

cmdline++;

if (*cmdline != 0) {

result = isc_lex_create(mctx, WORDLEN, &lex);

check_result(result, "isc_lex_create");

isc_buffer_init(&source, cmdline, strlen(cmdline));

isc_buffer_add(&source, strlen(cmdline));

result = isc_lex_openbuffer(lex, &source);

check_result(result, "isc_lex_openbuffer");

result = isc_buffer_allocate(mctx, &buf, MXNAME);

check_result(result, "isc_buffer_allocate");

dns_rdatacallbacks_init_stdio(&callbacks);

if (userzone != NULL)

rn = userzone;

else

rn = origin;

result = dns_rdata_fromtext(*rdatap, rdataclass, rdatatype,

lex, rn, ISC_FALSE, buf,

&callbacks);

dns_message_takebuffer(msg, &buf);

isc_lex_destroy(&lex);

if (result != ISC_R_SUCCESS)

return (STATUS_MORE);

}

*cmdlinep = cmdline;

return (STATUS_MORE);

}

static isc_uint16_t

make_prereq(char *cmdline, isc_boolean_t ispositive, isc_boolean_t isrrset) {

isc_result_t result;

char *word;

dns_name_t *name = NULL;

isc_textregion_t region;

dns_rdataset_t *rdataset = NULL;

dns_rdatalist_t *rdatalist = NULL;

dns_rdataclass_t rdataclass;

dns_rdatatype_t rdatatype;

dns_rdata_t *rdata = NULL;

isc_uint16_t retval;

ddebug("make_prereq()");

/*

retval = parse_name(&cmdline, updatemsg, &name);

if (retval != STATUS_MORE)

return (retval);

/*

if (isrrset) {

word = nsu_strsep(&cmdline, " \t\r\n");

if (*word == 0) {

fprintf(stderr, "failed to read class or type\n");

dns_message_puttempname(updatemsg, &name);

return (STATUS_SYNTAX);

}

region.base = word;

region.length = strlen(word);

result = dns_rdataclass_fromtext(&rdataclass, &region);

if (result == ISC_R_SUCCESS) {

/*

word = nsu_strsep(&cmdline, " \t\r\n");

if (*word == 0) {

fprintf(stderr, "failed to read type\n");

dns_message_puttempname(updatemsg, &name);

return (STATUS_SYNTAX);

}

region.base = word;

region.length = strlen(word);

result = dns_rdatatype_fromtext(&rdatatype, &region);

check_result(result, "dns_rdatatype_fromtext");

} else {

rdataclass = dns_rdataclass_in;

result = dns_rdatatype_fromtext(&rdatatype, &region);

check_result(result, "dns_rdatatype_fromtext");

}

} else

rdatatype = dns_rdatatype_any;

result = dns_message_gettemprdata(updatemsg, &rdata);

check_result(result, "dns_message_gettemprdata");

rdata->data = NULL;

rdata->length = 0;

if (isrrset && ispositive) {

retval = parse_rdata(&cmdline, rdataclass, rdatatype,

updatemsg, &rdata);

if (retval != STATUS_MORE)

return (retval);

}

result = dns_message_gettemprdatalist(updatemsg, &rdatalist);

check_result(result, "dns_message_gettemprdatalist");

result = dns_message_gettemprdataset(updatemsg, &rdataset);

check_result(result, "dns_message_gettemprdataset");

dns_rdatalist_init(rdatalist);

rdatalist->type = rdatatype;

if (ispositive) {

if (isrrset && rdata->data != NULL)

rdatalist->rdclass = rdataclass;

else

rdatalist->rdclass = dns_rdataclass_any;

} else

rdatalist->rdclass = dns_rdataclass_none;

rdatalist->covers = 0;

rdatalist->ttl = 0;

rdata->rdclass = rdatalist->rdclass;

rdata->type = rdatatype;

ISC_LIST_INIT(rdatalist->rdata);

ISC_LIST_APPEND(rdatalist->rdata, rdata, link);

dns_rdataset_init(rdataset);

dns_rdatalist_tordataset(rdatalist, rdataset);

ISC_LIST_INIT(name->list);

ISC_LIST_APPEND(name->list, rdataset, link);

dns_message_addname(updatemsg, name, DNS_SECTION_PREREQUISITE);

return (STATUS_MORE);

}

static isc_uint16_t

evaluate_prereq(char *cmdline) {

char *word;

isc_boolean_t ispositive, isrrset;

ddebug("evaluate_prereq()");

word = nsu_strsep(&cmdline, " \t\r\n");

if (*word == 0) {

fprintf(stderr, "failed to read operation code\n");

return (STATUS_SYNTAX);

}

if (strcasecmp(word, "nxdomain") == 0) {

ispositive = ISC_FALSE;

isrrset = ISC_FALSE;

} else if (strcasecmp(word, "yxdomain") == 0) {

ispositive = ISC_TRUE;

isrrset = ISC_FALSE;

} else if (strcasecmp(word, "nxrrset") == 0) {

ispositive = ISC_FALSE;

isrrset = ISC_TRUE;

} else if (strcasecmp(word, "yxrrset") == 0) {

ispositive = ISC_TRUE;

isrrset = ISC_TRUE;

} else {

fprintf(stderr, "incorrect operation code: %s\n", word);

return (STATUS_SYNTAX);

}

return (make_prereq(cmdline, ispositive, isrrset));

}

static isc_uint16_t

evaluate_server(char *cmdline) {

char *word, *server;

in_port_t port;

word = nsu_strsep(&cmdline, " \t\r\n");

if (*word == 0) {

fprintf(stderr, "failed to read server name\n");

return (STATUS_SYNTAX);

}

server = word;

word = nsu_strsep(&cmdline, " \t\r\n");

if (*word == 0)

port = DNSDEFAULTPORT;

else {

char *endp;

port = strtol(word, &endp, 10);

if (*endp != 0) {

fprintf(stderr, "port '%s' is not numeric\n", word);

return (STATUS_SYNTAX);

}

}

if (userserver == NULL) {

userserver = isc_mem_get(mctx, sizeof(isc_sockaddr_t));

if (userserver == NULL)

fatal("out of memory");

}

get_address(server, port, userserver);

return (STATUS_MORE);

}

static isc_uint16_t

evaluate_zone(char *cmdline) {

char *word;

isc_buffer_t b;

isc_result_t result;

word = nsu_strsep(&cmdline, " \t\r\n");

if (*word == 0) {

fprintf(stderr, "failed to read zone name\n");

return (STATUS_SYNTAX);

}

dns_fixedname_init(&fuserzone);

userzone = dns_fixedname_name(&fuserzone);

isc_buffer_init(&b, word, strlen(word));

isc_buffer_add(&b, strlen(word));

result = dns_name_fromtext(userzone, &b, dns_rootname, ISC_FALSE,

NULL);

if (result != ISC_R_SUCCESS) {

fprintf(stderr, "failed to parse zone name\n");

return (STATUS_SYNTAX);

}

return (STATUS_MORE);

}

static isc_uint16_t

update_addordelete(char *cmdline, isc_boolean_t isdelete) {

isc_result_t result;

dns_name_t *name = NULL;

isc_uint16_t ttl;

char *word;

dns_rdataclass_t rdataclass;

dns_rdatatype_t rdatatype;

dns_rdata_t *rdata = NULL;

dns_rdatalist_t *rdatalist = NULL;

dns_rdataset_t *rdataset = NULL;

isc_textregion_t region;

char *endp;

isc_uint16_t retval;

ddebug("update_addordelete()");

/*

retval = parse_name(&cmdline, updatemsg, &name);

if (retval != STATUS_MORE)

return (retval);

result = dns_message_gettemprdata(updatemsg, &rdata);

check_result(result, "dns_message_gettemprdata");

rdata->rdclass = 0;

rdata->type = 0;

rdata->data = NULL;

rdata->length = 0;

/*

if (!isdelete) {

word = nsu_strsep(&cmdline, " \t\r\n");

if (*word == 0) {

fprintf(stderr, "failed to read owner ttl\n");

goto failure;

}

ttl = strtol(word, &endp, 0);

if (*endp != 0) {

fprintf(stderr, "ttl '%s' is not numeric\n", word);

goto failure;

}

} else

ttl = 0;

/*

word = nsu_strsep(&cmdline, " \t\r\n");

if (*word == 0) {

if (isdelete) {

rdataclass = dns_rdataclass_any;

rdatatype = dns_rdatatype_any;

goto doneparsing;

} else {

fprintf(stderr, "failed to read class or type\n");

goto failure;

}

}

region.base = word;

region.length = strlen(word);

result = dns_rdataclass_fromtext(&rdataclass, &region);

if (result == ISC_R_SUCCESS) {

/*

word = nsu_strsep(&cmdline, " \t\r\n");

if (*word == 0) {

if (isdelete) {

rdataclass = dns_rdataclass_any;

rdatatype = dns_rdatatype_any;

goto doneparsing;

} else {

fprintf(stderr, "failed to read type\n");

goto failure;

}

}

region.base = word;

region.length = strlen(word);

result = dns_rdatatype_fromtext(&rdatatype, &region);

check_result(result, "dns_rdatatype_fromtext");

} else {

rdataclass = dns_rdataclass_in;

result = dns_rdatatype_fromtext(&rdatatype, &region);

check_result(result, "dns_rdatatype_fromtext");

}

retval = parse_rdata(&cmdline, rdataclass, rdatatype, updatemsg,

&rdata);

if (retval != STATUS_MORE)

goto failure;

if (isdelete) {

if (rdata->length == 0)

rdataclass = dns_rdataclass_any;

else

rdataclass = dns_rdataclass_none;

} else {

if (rdata->length == 0) {

fprintf(stderr, "failed to read rdata\n");

goto failure;

}

}

doneparsing:

result = dns_message_gettemprdatalist(updatemsg, &rdatalist);

check_result(result, "dns_message_gettemprdatalist");

result = dns_message_gettemprdataset(updatemsg, &rdataset);

check_result(result, "dns_message_gettemprdataset");

dns_rdatalist_init(rdatalist);

rdatalist->type = rdatatype;

rdatalist->rdclass = rdataclass;

rdatalist->covers = rdatatype;

rdatalist->ttl = ttl;

ISC_LIST_INIT(rdatalist->rdata);

ISC_LIST_APPEND(rdatalist->rdata, rdata, link);

dns_rdataset_init(rdataset);

dns_rdatalist_tordataset(rdatalist, rdataset);

ISC_LIST_INIT(name->list);

ISC_LIST_APPEND(name->list, rdataset, link);

dns_message_addname(updatemsg, name, DNS_SECTION_UPDATE);

return (STATUS_MORE);

failure:

if (name != NULL)

dns_message_puttempname(updatemsg, &name);

if (rdata != NULL)

dns_message_puttemprdata(updatemsg, &rdata);

return (STATUS_SYNTAX);

}

static isc_uint16_t

evaluate_update(char *cmdline) {

char *word;

isc_boolean_t isdelete;

ddebug("evaluate_update()");

word = nsu_strsep(&cmdline, " \t\r\n");

if (*word == 0) {

fprintf(stderr, "failed to read operation code\n");

return (STATUS_SYNTAX);

}

if (strcasecmp(word, "delete") == 0)

isdelete = ISC_TRUE;

else if (strcasecmp(word, "add") == 0)

isdelete = ISC_FALSE;

else {

fprintf(stderr, "incorrect operation code: %s\n", word);

return (STATUS_SYNTAX);

}

return (update_addordelete(cmdline, isdelete));

}

static void

show_message(void) {

isc_result_t result;

char store[MSGTEXT];

isc_buffer_t buf;

ddebug("show_message()");

isc_buffer_init(&buf, store, MSGTEXT);

result = dns_message_totext(updatemsg, 0, &buf);

if (result != ISC_R_SUCCESS) {

fprintf(stderr, "Failed to concert message to text format.\n");

return;

}

printf("Outgoing update query:\n%.*s",

(int)isc_buffer_usedlength(&buf),

(char*)isc_buffer_base(&buf));

}

static isc_uint16_t

get_next_command(void) {

char cmdlinebuf[MAXCMD];

char *cmdline;

char *word;

ddebug("get_next_command()");

fprintf(stdout, "> ");

fgets (cmdlinebuf, MAXCMD, stdin);

cmdline = cmdlinebuf;

word = nsu_strsep(&cmdline, " \t\r\n");

if (feof(stdin))

return (STATUS_QUIT);

if (*word == 0)

return (STATUS_SEND);

if (strcasecmp(word, "quit") == 0)

return (STATUS_QUIT);

if (strcasecmp(word, "prereq") == 0)

return (evaluate_prereq(cmdline));

if (strcasecmp(word, "update") == 0)

return (evaluate_update(cmdline));

if (strcasecmp(word, "server") == 0)

return (evaluate_server(cmdline));

if (strcasecmp(word, "zone") == 0)

return (evaluate_zone(cmdline));

if (strcasecmp(word, "send") == 0)

return (STATUS_SEND);

if (strcasecmp(word, "show") == 0) {

show_message();

return (STATUS_MORE);

}

fprintf(stderr, "incorrect section name: %s\n", word);

return (STATUS_SYNTAX);

}

static isc_boolean_t

user_interaction(void) {

isc_uint16_t result = STATUS_MORE;

ddebug("user_interaction()");

while ((result == STATUS_MORE) || (result == STATUS_SYNTAX))

result = get_next_command();

if (result == STATUS_SEND)

return (ISC_TRUE);

return (ISC_FALSE);

}

static void

done_update(isc_boolean_t acquirelock) {

if (acquirelock)

LOCK(&lock);

busy = ISC_FALSE;

SIGNAL(&cond);

if (acquirelock)

UNLOCK(&lock);

}

static void

update_completed(isc_task_t *task, isc_event_t *event) {

dns_requestevent_t *reqev = NULL;

isc_result_t result;

isc_buffer_t buf;

dns_message_t *rcvmsg = NULL;

char bufstore[MSGTEXT];

UNUSED(task);

ddebug("updated_completed()");

REQUIRE(event->ev_type == DNS_EVENT_REQUESTDONE);

reqev = (dns_requestevent_t *)event;

if (reqev->result != ISC_R_SUCCESS) {

fprintf(stderr, "; Communication with server failed: %s\n",

isc_result_totext(reqev->result));

goto done;

}

result = dns_message_create(mctx, DNS_MESSAGE_INTENTPARSE, &rcvmsg);

check_result(result, "dns_message_create");

result = dns_request_getresponse(reqev->request, rcvmsg, ISC_TRUE);

check_result(result, "dns_request_getresponse");

if (debugging) {

isc_buffer_init(&buf, bufstore, MSGTEXT);

result = dns_message_totext(rcvmsg, 0, &buf);

check_result(result, "dns_message_totext");

fprintf(stderr, "\nReply from update query:\n%.*s\n",

(int)isc_buffer_usedlength(&buf),

(char*)isc_buffer_base(&buf));

}

dns_message_destroy(&rcvmsg);

done:

dns_request_destroy(&reqev->request);

isc_event_free(&event);

done_update(ISC_TRUE);

}

static void

send_update(dns_name_t *zonename, isc_sockaddr_t *master) {

isc_result_t result;

dns_request_t *request = NULL;

dns_name_t *name = NULL;

dns_rdataset_t *rdataset = NULL;

unsigned int options = 0;

ddebug("send_update()");

result = dns_message_gettempname(updatemsg, &name);

check_result(result, "dns_message_gettempname");

dns_name_init(name, NULL);

dns_name_clone(zonename, name);

result = dns_message_gettemprdataset(updatemsg, &rdataset);

check_result(result, "dns_message_gettemprdataset");

dns_rdataset_makequestion(rdataset, dns_rdataclass_in,

dns_rdatatype_soa);

ISC_LIST_INIT(name->list);

ISC_LIST_APPEND(name->list, rdataset, link);

dns_message_addname(updatemsg, name, DNS_SECTION_ZONE);

if (usevc)

options |= DNS_REQUESTOPT_TCP;

result = dns_request_create(requestmgr, updatemsg, master,

options, key,

FIND_TIMEOUT, global_task,

update_completed, NULL, &request);

check_result(result, "dns_request_create");

}

static void

recvsoa(isc_task_t *task, isc_event_t *event) {

dns_requestevent_t *reqev = NULL;

dns_request_t *request = NULL;

isc_result_t result, eresult;

dns_message_t *rcvmsg = NULL;

dns_section_t section;

dns_name_t *name = NULL;

dns_rdataset_t *soaset = NULL;

dns_rdata_soa_t soa;

dns_rdata_t soarr;

int pass = 0;

dns_name_t master;

isc_sockaddr_t *serveraddr, tempaddr;

dns_name_t *zonename;

nsu_requestinfo_t *reqinfo;

dns_message_t *soaquery = NULL;

isc_sockaddr_t *addr;

UNUSED(task);

ddebug("recvsoa()");

REQUIRE(event->ev_type == DNS_EVENT_REQUESTDONE);

reqev = (dns_requestevent_t *)event;

request = reqev->request;

eresult = reqev->result;

reqinfo = reqev->ev_arg;

soaquery = reqinfo->msg;

addr = reqinfo->addr;

isc_event_free(&event);

reqev = NULL;

if (eresult != ISC_R_SUCCESS) {

char addrbuf[ISC_SOCKADDR_FORMATSIZE];

isc_sockaddr_format(addr, addrbuf, sizeof(addrbuf));

fprintf(stderr, "; Communication with %s failed: %s\n",

addrbuf, isc_result_totext(eresult));

if (userserver != NULL)

fatal("Couldn't talk to specified nameserver.");

else if (ns_inuse++ >= lwconf->nsnext)

fatal("Couldn't talk to any default nameserver.");

ddebug("Destroying request [%lx]", request);

dns_request_destroy(&request);

sendrequest(&servers[ns_inuse], soaquery, &request);

isc_mem_put(mctx, reqinfo, sizeof(nsu_requestinfo_t));

return;

}

dns_message_destroy(&soaquery);

isc_mem_put(mctx, reqinfo, sizeof(nsu_requestinfo_t));

ddebug("About to create rcvmsg");

result = dns_message_create(mctx, DNS_MESSAGE_INTENTPARSE, &rcvmsg);

check_result(result, "dns_message_create");

result = dns_request_getresponse(request, rcvmsg, ISC_TRUE);

check_result(result, "dns_request_getresponse");

section = DNS_SECTION_ANSWER;

if (debugging) {

isc_buffer_t buf;

char bufstore[MSGTEXT];

isc_buffer_init(&buf, bufstore, MSGTEXT);

result = dns_message_totext(rcvmsg, 0, &buf);

check_result(result, "dns_message_totext");

fprintf(stderr, "Reply from SOA query:\n%.*s\n",

(int)isc_buffer_usedlength(&buf),

(char*)isc_buffer_base(&buf));

}

if (rcvmsg->rcode != dns_rcode_noerror &&

rcvmsg->rcode != dns_rcode_nxdomain)

fatal("response to SOA query was unsuccessful");

lookforsoa:

if (pass == 0)

section = DNS_SECTION_ANSWER;

else if (pass == 1)

section = DNS_SECTION_AUTHORITY;

else

fatal("response to SOA query didn't contain an SOA");

result = dns_message_firstname(rcvmsg, section);

if (result != ISC_R_SUCCESS) {

pass++;

goto lookforsoa;

}

while (result == ISC_R_SUCCESS) {

name = NULL;

dns_message_currentname(rcvmsg, section, &name);

soaset = NULL;

result = dns_message_findtype(name, dns_rdatatype_soa, 0,

&soaset);

if (result == ISC_R_SUCCESS)

break;

result = dns_message_nextname(rcvmsg, section);

}

if (soaset == NULL) {

pass++;

goto lookforsoa;

}

if (debugging) {

char namestr[MAXPNAME];

dns_name_format(name, namestr, sizeof(namestr));

fprintf(stderr, "Found zone name: %s\n", namestr);

}

result = dns_rdataset_first(soaset);

check_result(result, "dns_rdataset_first");

dns_rdata_init(&soarr);

dns_rdataset_current(soaset, &soarr);

result = dns_rdata_tostruct(&soarr, &soa, NULL);

check_result(result, "dns_rdata_tostruct");

dns_name_init(&master, NULL);

dns_name_clone(&soa.origin, &master);

if (userzone != NULL)

zonename = userzone;

else

zonename = name;

if (debugging) {

char namestr[MAXPNAME];

dns_name_format(&master, namestr, sizeof(namestr));

fprintf(stderr, "The master is: %s\n", namestr);

}

if (userserver != NULL)

serveraddr = userserver;

else {

char serverstr[MXNAME];

isc_buffer_t buf;

isc_buffer_init(&buf, serverstr, sizeof(serverstr));

result = dns_name_totext(&master, ISC_TRUE, &buf);

check_result(result, "dns_name_totext");

serverstr[isc_buffer_usedlength(&buf)] = 0;

get_address(serverstr, DNSDEFAULTPORT, &tempaddr);

serveraddr = &tempaddr;

}

send_update(zonename, serveraddr);

dns_rdata_freestruct(&soa);

dns_message_destroy(&rcvmsg);

dns_request_destroy(&request);

ddebug("Out of recvsoa");

}

static void

sendrequest(isc_sockaddr_t *address, dns_message_t *msg,

dns_request_t **request)

{

isc_result_t result;

nsu_requestinfo_t *reqinfo;

reqinfo = isc_mem_get(mctx, sizeof(nsu_requestinfo_t));

if (reqinfo == NULL)

fatal("out of memory");

reqinfo->msg = msg;

reqinfo->addr = address;

result = dns_request_create(requestmgr, msg, address,

0, NULL, FIND_TIMEOUT, global_task,

recvsoa, reqinfo, request);

check_result(result, "dns_request_create");

}

static void

start_update(void) {

isc_result_t result;

dns_rdataset_t *rdataset = NULL;

dns_name_t *name = NULL;

dns_request_t *request = NULL;

dns_message_t *soaquery = NULL;

dns_name_t *firstname;

ddebug("start_update()");

if (userzone != NULL && userserver != NULL) {

send_update(userzone, userserver);

return;

}

result = dns_message_firstname(updatemsg, DNS_SECTION_UPDATE);

if (result != ISC_R_SUCCESS) {

done_update(ISC_FALSE);

return;

}

result = dns_message_create(mctx, DNS_MESSAGE_INTENTRENDER,

&soaquery);

check_result(result, "dns_message_create");

soaquery->flags |= DNS_MESSAGEFLAG_RD;

result = dns_message_gettempname(soaquery, &name);

check_result(result, "dns_message_gettempname");

result = dns_message_gettemprdataset(soaquery, &rdataset);

check_result(result, "dns_message_gettemprdataset");

dns_rdataset_makequestion(rdataset, dns_rdataclass_in,

dns_rdatatype_soa);

firstname = NULL;

dns_message_currentname(updatemsg, DNS_SECTION_UPDATE, &firstname);

dns_name_init(name, NULL);

dns_name_clone(firstname, name);

ISC_LIST_INIT(name->list);

ISC_LIST_APPEND(name->list, rdataset, link);

dns_message_addname(soaquery, name, DNS_SECTION_QUESTION);

if (userserver != NULL)

sendrequest(userserver, soaquery, &request);

else {

ns_inuse = 0;

sendrequest(&servers[ns_inuse], soaquery, &request);

}

}

static void

cleanup(void) {

ddebug("cleanup()");

if (userserver != NULL)

isc_mem_put(mctx, userserver, sizeof(isc_sockaddr_t));

if (key != NULL) {

debug("Freeing key");

dns_tsigkey_detach(&key);

}

if (updatemsg != NULL)

dns_message_destroy(&updatemsg);

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);

}

lwres_conf_clear(lwctx);

lwres_context_destroy(&lwctx);

isc_mem_put(mctx, servers, ns_total * sizeof(isc_sockaddr_t));

ddebug("Shutting down request manager");

dns_requestmgr_shutdown(requestmgr);

dns_requestmgr_detach(&requestmgr);

ddebug("Freeing the dispatcher");

dns_dispatch_detach(&dispatchv4);

ddebug("Shutting down dispatch manager");

dns_dispatchmgr_destroy(&dispatchmgr);

ddebug("Ending task");

isc_task_detach(&global_task);

ddebug("Shutting down task manager");

isc_taskmgr_destroy(&taskmgr);

ddebug("Shutting down socket manager");

isc_socketmgr_destroy(&socketmgr);

ddebug("Shutting down timer manager");

isc_timermgr_destroy(&timermgr);

ddebug("Destroying memory context");

if (isc_mem_debugging)

isc_mem_stats(mctx, stderr);

isc_mem_destroy(&mctx);

}

main(int argc, char **argv) {

isc_result_t result;

parse_args(argc, argv);

setup_system();

result = isc_mutex_init(&lock);

check_result(result, "isc_mutex_init");

result = isc_condition_init(&cond);

check_result(result, "isc_condition_init");

LOCK(&lock);

while (ISC_TRUE) {

reset_system();

if (!user_interaction())

break;

busy = ISC_TRUE;

start_update();

while (busy)

WAIT(&cond, &lock);

}

fprintf(stdout, "\n");

isc_mutex_destroy(&lock);

isc_condition_destroy(&cond);

cleanup();

return (0);

}