host.c revision d8dde7c9fb66407ebe3263859f75e3d64164de82
/*
* Copyright (C) 2000, 2001 Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
* INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: host.c,v 1.65 2001/02/15 23:44:06 tamino Exp $ */
#include <config.h>
#include <stdlib.h>
#include <limits.h>
extern int h_errno;
#include <isc/app.h>
#include <isc/commandline.h>
#include <isc/netaddr.h>
#include <isc/string.h>
#include <isc/util.h>
#include <isc/task.h>
#include <dns/byaddr.h>
#include <dns/fixedname.h>
#include <dns/message.h>
#include <dns/name.h>
#include <dns/rdata.h>
#include <dns/rdataclass.h>
#include <dns/rdataset.h>
#include <dns/rdatatype.h>
#include <dig/dig.h>
extern ISC_LIST(dig_lookup_t) lookup_list;
extern ISC_LIST(dig_server_t) server_list;
extern ISC_LIST(dig_searchlist_t) search_list;
extern isc_boolean_t usesearch;
extern isc_boolean_t debugging;
extern unsigned int timeout;
extern isc_mem_t *mctx;
extern int ndots;
extern int tries;
extern char *progname;
extern isc_task_t *global_task;
isc_boolean_t short_form = ISC_TRUE, listed_server = ISC_FALSE;
static const char *opcodetext[] = {
"QUERY",
"IQUERY",
"STATUS",
"RESERVED3",
"NOTIFY",
"UPDATE",
"RESERVED6",
"RESERVED7",
"RESERVED8",
"RESERVED9",
"RESERVED10",
"RESERVED11",
"RESERVED12",
"RESERVED13",
"RESERVED14",
"RESERVED15"
};
static const char *rcodetext[] = {
"NOERROR",
"FORMERR",
"SERVFAIL",
"NXDOMAIN",
"NOTIMPL",
"REFUSED",
"YXDOMAIN",
"YXRRSET",
"NXRRSET",
"NOTAUTH",
"NOTZONE",
"RESERVED11",
"RESERVED12",
"RESERVED13",
"RESERVED14",
"RESERVED15",
"BADVERS"
};
static const char *rtypetext[] = {
"zero", /* 0 */
"has address", /* 1 */
"name server", /* 2 */
"MD", /* 3 */
"MF", /* 4 */
"is an alias for", /* 5 */
"SOA", /* 6 */
"MB", /* 7 */
"MG", /* 8 */
"MR", /* 9 */
"NULL", /* 10 */
"has well known services", /* 11 */
"domain name pointer", /* 12 */
"host information", /* 13 */
"MINFO", /* 14 */
"mail is handled by", /* 15 */
"text", /* 16 */
"RP", /* 17 */
"AFSDB", /* 18 */
"x25 address", /* 19 */
"isdn address", /* 20 */
"RT", /* 21 */
"NSAP", /* 22 */
"NSAP_PTR", /* 23 */
"has signature", /* 24 */
"has key", /* 25 */
"PX", /* 26 */
"GPOS", /* 27 */
"has AAAA address", /* 28 */
"LOC", /* 29 */
"has next record", /* 30 */
"EID", /* 31 */
"NIMLOC", /* 32 */
"SRV", /* 33 */
"ATMA", /* 34 */
"NAPTR", /* 35 */
"KX", /* 36 */
"CERT", /* 37 */
"has v6 address", /* 38 */
"DNAME", /* 39 */
"has optional information", /* 41 */
"has 42 record", /* 42 */
"has 43 record", /* 43 */
"has 44 record", /* 44 */
"has 45 record", /* 45 */
"has 46 record", /* 46 */
"has 47 record", /* 47 */
"has 48 record", /* 48 */
"has 49 record", /* 49 */
"has 50 record", /* 50 */
"has 51 record", /* 51 */
"has 52 record", /* 52 */
"has 53 record", /* 53 */
"has 54 record", /* 54 */
"has 55 record", /* 55 */
"has 56 record", /* 56 */
"has 57 record", /* 57 */
"has 58 record", /* 58 */
"has 59 record", /* 59 */
"has 60 record", /* 60 */
"has 61 record", /* 61 */
"has 62 record", /* 62 */
"has 63 record", /* 63 */
"has 64 record", /* 64 */
"has 65 record", /* 65 */
"has 66 record", /* 66 */
"has 67 record", /* 67 */
"has 68 record", /* 68 */
"has 69 record", /* 69 */
"has 70 record", /* 70 */
"has 71 record", /* 71 */
"has 72 record", /* 72 */
"has 73 record", /* 73 */
"has 74 record", /* 74 */
"has 75 record", /* 75 */
"has 76 record", /* 76 */
"has 77 record", /* 77 */
"has 78 record", /* 78 */
"has 79 record", /* 79 */
"has 80 record", /* 80 */
"has 81 record", /* 81 */
"has 82 record", /* 82 */
"has 83 record", /* 83 */
"has 84 record", /* 84 */
"has 85 record", /* 85 */
"has 86 record", /* 86 */
"has 87 record", /* 87 */
"has 88 record", /* 88 */
"has 89 record", /* 89 */
"has 90 record", /* 90 */
"has 91 record", /* 91 */
"has 92 record", /* 92 */
"has 93 record", /* 93 */
"has 94 record", /* 94 */
"has 95 record", /* 95 */
"has 96 record", /* 96 */
"has 97 record", /* 97 */
"has 98 record", /* 98 */
"has 99 record", /* 99 */
"UINFO", /* 100 */
"UID", /* 101 */
"GID", /* 102 */
"UNSPEC"}; /* 103 */
static void
show_usage(void) {
fputs(
"Usage: host [-aCdlrTwv] [-c class] [-n] [-N ndots] [-t type] [-W time]\n"
" [-R number] hostname [server]\n"
" -a is equivalent to -v -t *\n"
" -c specifies query class for non-IN data\n"
" -C compares SOA records on authorative nameservers\n"
" -d is equivalent to -v\n"
" -l lists all hosts in a domain, using AXFR\n"
" -n Use the nibble form of IPv6 reverse lookup\n"
" -N changes the number of dots allowed before root lookup is done\n"
" -r disables recursive processing\n"
" -R specifies number of retries for UDP packets\n"
" -t specifies the query type\n"
" -T enables TCP/IP mode\n"
" -v enables verbose output\n"
" -w specifies to wait forever for a reply\n"
" -W specifies how long to wait for a reply\n", stderr);
exit(1);
}
void
dighost_shutdown(void) {
isc_app_shutdown();
}
void
received(int bytes, isc_sockaddr_t *from, dig_query_t *query)
{
isc_time_t now;
isc_result_t result;
int diff;
if (!short_form) {
char fromtext[ISC_SOCKADDR_FORMATSIZE];
isc_sockaddr_format(from, fromtext, sizeof(fromtext));
result = isc_time_now(&now);
check_result(result, "isc_time_now");
diff = isc_time_microdiff(&now, &query->time_sent);
printf("Received %u bytes from %s in %d ms\n",
bytes, fromtext, diff/1000);
}
}
void
trying(int frmsize, char *frm, dig_lookup_t *lookup) {
UNUSED(lookup);
if (!short_form)
printf("Trying \"%.*s\"\n", frmsize, frm);
}
static void
say_message(dns_name_t *name, const char *msg, dns_rdata_t *rdata,
dig_query_t *query)
{
isc_buffer_t *b = NULL, *b2 = NULL;
isc_region_t r, r2;
isc_result_t result;
result = isc_buffer_allocate(mctx, &b, BUFSIZE);
check_result(result, "isc_buffer_allocate");
result = isc_buffer_allocate(mctx, &b2, BUFSIZE);
check_result(result, "isc_buffer_allocate");
result = dns_name_totext(name, ISC_FALSE, b);
check_result(result, "dns_name_totext");
isc_buffer_usedregion(b, &r);
result = dns_rdata_totext(rdata, NULL, b2);
check_result(result, "dns_rdata_totext");
isc_buffer_usedregion(b2, &r2);
if (query->lookup->identify_previous_line) {
printf("Nameserver %s:\n\t",
query->servname);
}
printf("%.*s %s %.*s", (int)r.length, (char *)r.base,
msg, (int)r2.length, (char *)r2.base);
if (query->lookup->identify) {
printf(" on server %s", query->servname);
}
printf("\n");
isc_buffer_free(&b);
isc_buffer_free(&b2);
}
static isc_result_t
printsection(dns_message_t *msg, dns_section_t sectionid,
const char *section_name, isc_boolean_t headers,
dig_query_t *query)
{
dns_name_t *name, *print_name;
dns_rdataset_t *rdataset;
dns_rdata_t rdata = DNS_RDATA_INIT;
isc_buffer_t target;
isc_result_t result, loopresult;
isc_region_t r;
dns_name_t empty_name;
char t[4096];
isc_boolean_t first;
isc_boolean_t no_rdata;
const char *rtt;
if (sectionid == DNS_SECTION_QUESTION)
no_rdata = ISC_TRUE;
else
no_rdata = ISC_FALSE;
if (headers)
printf(";; %s SECTION:\n", section_name);
dns_name_init(&empty_name, NULL);
result = dns_message_firstname(msg, sectionid);
if (result == ISC_R_NOMORE)
return (ISC_R_SUCCESS);
else if (result != ISC_R_SUCCESS)
return (result);
for (;;) {
name = NULL;
dns_message_currentname(msg, sectionid, &name);
isc_buffer_init(&target, t, sizeof(t));
first = ISC_TRUE;
print_name = name;
for (rdataset = ISC_LIST_HEAD(name->list);
rdataset != NULL;
rdataset = ISC_LIST_NEXT(rdataset, link)) {
if (!short_form) {
result = dns_rdataset_totext(rdataset,
print_name,
ISC_FALSE,
no_rdata,
&target);
if (result != ISC_R_SUCCESS)
return (result);
#ifdef USEINITALWS
if (first) {
print_name = &empty_name;
first = ISC_FALSE;
}
#else
UNUSED(first); /* Shut up compiler. */
#endif
} else {
loopresult = dns_rdataset_first(rdataset);
while (loopresult == ISC_R_SUCCESS) {
dns_rdataset_current(rdataset, &rdata);
if (rdata.type <= 103)
rtt = rtypetext[rdata.type];
else if (rdata.type == 249)
rtt = "key";
else if (rdata.type == 250)
rtt = "signature";
else
rtt = "unknown";
say_message(print_name, rtt,
&rdata, query);
dns_rdata_reset(&rdata);
loopresult =
dns_rdataset_next(rdataset);
}
}
}
if (!short_form) {
isc_buffer_usedregion(&target, &r);
if (no_rdata)
printf(";%.*s", (int)r.length,
(char *)r.base);
else
printf("%.*s", (int)r.length, (char *)r.base);
}
result = dns_message_nextname(msg, sectionid);
if (result == ISC_R_NOMORE)
break;
else if (result != ISC_R_SUCCESS)
return (result);
}
return (ISC_R_SUCCESS);
}
static isc_result_t
printrdata(dns_message_t *msg, dns_rdataset_t *rdataset, dns_name_t *owner,
const char *set_name, isc_boolean_t headers)
{
isc_buffer_t target;
isc_result_t result;
isc_region_t r;
char t[4096];
UNUSED(msg);
if (headers)
printf(";; %s SECTION:\n", set_name);
isc_buffer_init(&target, t, sizeof(t));
result = dns_rdataset_totext(rdataset, owner, ISC_FALSE, ISC_FALSE,
&target);
if (result != ISC_R_SUCCESS)
return (result);
isc_buffer_usedregion(&target, &r);
printf("%.*s", (int)r.length, (char *)r.base);
return (ISC_R_SUCCESS);
}
isc_result_t
printmessage(dig_query_t *query, dns_message_t *msg, isc_boolean_t headers) {
isc_boolean_t did_flag = ISC_FALSE;
dns_rdataset_t *opt, *tsig = NULL;
dns_name_t *tsigname;
isc_result_t result = ISC_R_SUCCESS;
isc_buffer_t *b = NULL;
isc_region_t r;
UNUSED(headers);
/*
* Special case. If we're doing an ns_search_only query, but we're
* still following pointers, haven't gotten to the real NS records
* yet, don't print anything.
*/
if (query->lookup->ns_search_only && !query->lookup->ns_search_only_leafnode)
return (ISC_R_SUCCESS);
if (listed_server) {
printf("Using domain server:\n");
printf("Name: %s\n", query->servname);
result = isc_buffer_allocate(mctx, &b, MXNAME);
check_result(result, "isc_buffer_allocate");
result = isc_sockaddr_totext(&query->sockaddr, b);
check_result(result, "isc_sockaddr_totext");
printf("Address: %.*s\n",
(int)isc_buffer_usedlength(b),
(char*)isc_buffer_base(b));
isc_buffer_free(&b);
printf("Aliases: \n\n");
}
if (msg->rcode != 0) {
result = isc_buffer_allocate(mctx, &b, MXNAME);
check_result(result, "isc_buffer_allocate");
result = dns_name_totext(query->lookup->name, ISC_FALSE,
b);
check_result(result, "dns_name_totext");
isc_buffer_usedregion(b, &r);
printf("Host %.*s not found: %d(%s)\n",
(int)r.length, (char *)r.base,
msg->rcode, rcodetext[msg->rcode]);
isc_buffer_free(&b);
return (ISC_R_SUCCESS);
}
if (!short_form) {
printf(";; ->>HEADER<<- opcode: %s, status: %s, id: %u\n",
opcodetext[msg->opcode], rcodetext[msg->rcode],
msg->id);
printf(";; flags: ");
if ((msg->flags & DNS_MESSAGEFLAG_QR) != 0) {
printf("qr");
did_flag = ISC_TRUE;
}
if ((msg->flags & DNS_MESSAGEFLAG_AA) != 0) {
printf("%saa", did_flag ? " " : "");
did_flag = ISC_TRUE;
}
if ((msg->flags & DNS_MESSAGEFLAG_TC) != 0) {
printf("%stc", did_flag ? " " : "");
did_flag = ISC_TRUE;
}
if ((msg->flags & DNS_MESSAGEFLAG_RD) != 0) {
printf("%srd", did_flag ? " " : "");
did_flag = ISC_TRUE;
}
if ((msg->flags & DNS_MESSAGEFLAG_RA) != 0) {
printf("%sra", did_flag ? " " : "");
did_flag = ISC_TRUE;
}
if ((msg->flags & DNS_MESSAGEFLAG_AD) != 0) {
printf("%sad", did_flag ? " " : "");
did_flag = ISC_TRUE;
}
if ((msg->flags & DNS_MESSAGEFLAG_CD) != 0) {
printf("%scd", did_flag ? " " : "");
did_flag = ISC_TRUE;
}
printf("; QUERY: %u, ANSWER: %u, "
"AUTHORITY: %u, ADDITIONAL: %u\n",
msg->counts[DNS_SECTION_QUESTION],
msg->counts[DNS_SECTION_ANSWER],
msg->counts[DNS_SECTION_AUTHORITY],
msg->counts[DNS_SECTION_ADDITIONAL]);
opt = dns_message_getopt(msg);
if (opt != NULL)
printf(";; EDNS: version: %u, udp=%u\n",
(unsigned int)((opt->ttl & 0x00ff0000) >> 16),
(unsigned int)opt->rdclass);
tsigname = NULL;
tsig = dns_message_gettsig(msg, &tsigname);
if (tsig != NULL)
printf(";; PSEUDOSECTIONS: TSIG\n");
}
if (! ISC_LIST_EMPTY(msg->sections[DNS_SECTION_QUESTION]) &&
!short_form) {
printf("\n");
result = printsection(msg, DNS_SECTION_QUESTION, "QUESTION",
ISC_TRUE, query);
if (result != ISC_R_SUCCESS)
return (result);
}
if (! ISC_LIST_EMPTY(msg->sections[DNS_SECTION_ANSWER])) {
if (!short_form)
printf("\n");
result = printsection(msg, DNS_SECTION_ANSWER, "ANSWER",
ISC_TF(!short_form), query);
if (result != ISC_R_SUCCESS)
return (result);
}
if (! ISC_LIST_EMPTY(msg->sections[DNS_SECTION_AUTHORITY]) &&
!short_form) {
printf("\n");
result = printsection(msg, DNS_SECTION_AUTHORITY, "AUTHORITY",
ISC_TRUE, query);
if (result != ISC_R_SUCCESS)
return (result);
}
if (! ISC_LIST_EMPTY(msg->sections[DNS_SECTION_ADDITIONAL]) &&
!short_form) {
printf("\n");
result = printsection(msg, DNS_SECTION_ADDITIONAL,
"ADDITIONAL", ISC_TRUE, query);
if (result != ISC_R_SUCCESS)
return (result);
}
if ((tsig != NULL) && !short_form) {
printf("\n");
result = printrdata(msg, tsig, tsigname,
"PSEUDOSECTION TSIG", ISC_TRUE);
if (result != ISC_R_SUCCESS)
return (result);
}
if (!short_form)
printf("\n");
return (result);
}
static void
parse_args(isc_boolean_t is_batchfile, int argc, char **argv) {
char hostname[MXNAME];
dig_server_t *srv;
dig_lookup_t *lookup;
int c;
char store[MXNAME];
isc_textregion_t tr;
isc_result_t result;
dns_rdatatype_t rdtype;
dns_rdataclass_t rdclass;
UNUSED(is_batchfile);
lookup = make_empty_lookup();
while ((c = isc_commandline_parse(argc, argv, "lvwrdt:c:aTCN:R:W:Dn"))
!= EOF) {
switch (c) {
case 'l':
lookup->tcp_mode = ISC_TRUE;
lookup->rdtype = dns_rdatatype_axfr;
lookup->rdtypeset = ISC_TRUE;
break;
case 'v':
case 'd':
short_form = ISC_FALSE;
break;
case 'r':
lookup->recurse = ISC_FALSE;
break;
case 't':
tr.base = isc_commandline_argument;
tr.length = strlen(isc_commandline_argument);
result = dns_rdatatype_fromtext(&rdtype,
(isc_textregion_t *)&tr);
if (result != ISC_R_SUCCESS)
fprintf(stderr,"Warning: invalid type: %s\n",
isc_commandline_argument);
else {
lookup->rdtype = rdtype;
lookup->rdtypeset = ISC_TRUE;
}
break;
case 'c':
tr.base = isc_commandline_argument;
tr.length = strlen(isc_commandline_argument);
result = dns_rdataclass_fromtext(&rdclass,
(isc_textregion_t *)&tr);
if (result != ISC_R_SUCCESS)
fprintf(stderr,"Warning: invalid class: %s\n",
isc_commandline_argument);
else {
lookup->rdclass = rdclass;
lookup->rdclassset = ISC_TRUE;
}
break;
case 'a':
lookup->rdtype = dns_rdatatype_any;
lookup->rdtypeset = ISC_TRUE;
short_form = ISC_FALSE;
break;
case 'n':
lookup->nibble = ISC_TRUE;
break;
case 'w':
/*
* The timer routines are coded such that
* timeout==MAXINT doesn't enable the timer
*/
timeout = INT_MAX;
break;
case 'W':
timeout = atoi(isc_commandline_argument);
if (timeout < 1)
timeout = 1;
break;
case 'R':
tries = atoi(isc_commandline_argument);
if (tries < 1)
tries = 1;
break;
case 'T':
lookup->tcp_mode = ISC_TRUE;
break;
case 'C':
debug("showing all SOAs");
lookup->rdtype = dns_rdatatype_soa;
lookup->rdtypeset = ISC_TRUE;
lookup->rdclass = dns_rdataclass_in;
lookup->rdclassset = ISC_TRUE;
lookup->ns_search_only = ISC_TRUE;
lookup->trace_root = ISC_TRUE;
lookup->identify_previous_line = ISC_TRUE;
break;
case 'N':
debug("setting NDOTS to %s",
isc_commandline_argument);
ndots = atoi(isc_commandline_argument);
break;
case 'D':
debugging = ISC_TRUE;
break;
}
}
if (isc_commandline_index >= argc) {
show_usage();
}
strncpy(hostname, argv[isc_commandline_index], sizeof(hostname));
hostname[sizeof(hostname)-1]=0;
if (argc > isc_commandline_index + 1) {
srv = make_server(argv[isc_commandline_index+1]);
debug("server is %s", srv->servername);
ISC_LIST_APPEND(server_list, srv, link);
listed_server = ISC_TRUE;
}
lookup->pending = ISC_FALSE;
if (get_reverse(store, hostname, lookup->nibble) == ISC_R_SUCCESS) {
strncpy(lookup->textname, store, sizeof(lookup->textname));
lookup->textname[sizeof(lookup->textname)-1] = 0;
lookup->rdtype = dns_rdatatype_ptr;
lookup->rdtypeset = ISC_TRUE;
} else {
strncpy(lookup->textname, hostname, sizeof(lookup->textname));
lookup->textname[sizeof(lookup->textname)-1]=0;
}
lookup->new_search = ISC_TRUE;
ISC_LIST_APPEND(lookup_list, lookup, link);
usesearch = ISC_TRUE;
}
int
main(int argc, char **argv) {
isc_result_t result;
ISC_LIST_INIT(lookup_list);
ISC_LIST_INIT(server_list);
ISC_LIST_INIT(search_list);
debug("main()");
progname = argv[0];
result = isc_app_start();
check_result(result, "isc_app_start");
setup_libs();
parse_args(ISC_FALSE, argc, argv);
setup_system();
result = isc_app_onrun(mctx, global_task, onrun_callback, NULL);
check_result(result, "isc_app_onrun");
isc_app_run();
cancel_all();
destroy_libs();
isc_app_finish();
return (0);
}