mir/bind
2
0
Fork 0
mirror of https://gitlab.isc.org/isc-projects/bind9 synced 2025-08-23 02:28:55 +00:00
Code Issues Releases Wiki Activity
bind/bin/dig/dig.c
Michael Sawyer ae72c54ef1 Fixed bug introduced when TCP mode added. 
Now supports AXFR.
2000-04-20 20:55:45 +00:00

1027 lines
26 KiB
C
Raw Blame History

/*
* Copyright (C) 1999, 2000 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.
*/
#include <config.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
extern int h_errno;
#include <isc/types.h>
#include <isc/app.h>
#include <isc/assertions.h>
#include <isc/error.h>
#include <isc/mem.h>
#include <isc/net.h>
#include <isc/netdb.h>
#include <isc/result.h>
#include <isc/sockaddr.h>
#include <isc/socket.h>
#include <isc/task.h>
#include <isc/timer.h>
#include <isc/time.h>
#include <isc/buffer.h>
#include <isc/list.h>
#include <isc/util.h>
#include <dns/types.h>
#include <dns/message.h>
#include <dns/name.h>
#include <dns/fixedname.h>
#include <dns/rdata.h>
#include <dns/rdatalist.h>
#include <dns/rdataset.h>
#include <dns/rdataclass.h>
#include <dns/rdatatype.h>
#include <dns/result.h>
#include <dig/dig.h>
#include <dig/printmsg.h>
ISC_LIST(dig_lookup_t) lookup_list;
ISC_LIST(dig_server_t) server_list;
isc_boolean_t tcp_mode=ISC_FALSE,
recurse=ISC_TRUE,
have_ipv6=ISC_FALSE;
in_port_t port;
unsigned int timeout;
isc_mem_t *mctx=NULL;
isc_taskmgr_t *taskmgr=NULL;
isc_task_t *task=NULL;
isc_timermgr_t *timermgr=NULL;
isc_socketmgr_t *socketmgr=NULL;
dns_messageid_t id;
dns_name_t rootorg;
char *rootspace[BUFSIZE];
isc_buffer_t rootbuf;
int sendcount=0;
static void
free_lists();
static void
hex_dump(isc_buffer_t *b)
{
unsigned int len;
isc_region_t r;
isc_buffer_remaining(b, &r);
printf ("Printing a buffer with length %d\n",r.length);
for (len = 0 ; len < r.length ; len++) {
printf("%02x ", r.base[len]);
if (len != 0 && len % 16 == 0)
printf("\n");
}
if (len % 16 != 0)
printf("\n");
}
static void
fatal(char *format, ...) {
va_list args;
va_start(args, format);
vfprintf(stderr, format, args);
va_end(args);
fprintf(stderr, "\n");
free_lists();
exit(1);
}
static inline void
check_result(isc_result_t result, char *msg) {
if (result != ISC_R_SUCCESS)
fatal("%s: %s", msg, isc_result_totext(result));
}
static isc_boolean_t
isclass(char *text) {
/* Tests if a field is a class, without needing isc libs
initialized. This list will have to be manually kept in
sync with what the libs support. */
static const char *classlist[] = {"in", "hs", "any"};
static const int numclasses = 3;
int i;
for (i=0;i<numclasses;i++) {
if (strcasecmp(text, classlist[i]) == 0)
return ISC_TRUE;
}
return ISC_FALSE;
}
static isc_boolean_t
istype(char *text) {
/* Tests if a field is a type, without needing isc libs
initialized. This list will have to be manually kept in
sync with what the libs support. */
static const char *typelist[] = {"a", "ns", "md", "mf", "cname",
"soa", "mb", "mg", "mr", "null",
"wks", "ptr", "hinfo", "minfo",
"mx", "txt", "rp", "afsdb",
"x25", "isdn", "rt", "nsap",
"nsap_ptr", "sig", "key", "px",
"gpos", "aaaa", "loc", "nxt",
"srv", "naptr", "kx", "cert",
"a6", "dname", "opt", "unspec",
"tkey", "tsig", "axfr"};
static const int numtypes = 41;
int i;
for (i=0;i<numtypes;i++) {
if (strcasecmp(text, typelist[i]) == 0)
return ISC_TRUE;
}
return ISC_FALSE;
}
static void
parse_args(isc_boolean_t is_batchfile, int argc, char **argv) {
isc_boolean_t have_host=ISC_FALSE;
dig_server_t *srv=NULL;
dig_lookup_t *lookup=NULL;
char *batchname=NULL;
char batchline[MXNAME];
FILE *fp=NULL;
int bargc;
char bargv[8][MXNAME];
for (argc--, argv++; argc > 0; argc--, argv++) {
if ((strncmp(argv[0],"@",1) == 0)
&& (!is_batchfile)) {
srv=isc_mem_allocate(mctx, sizeof(struct dig_server));
if (srv == NULL)
fatal ("Memory allocation failure.");
strncpy(srv->servername,&argv[0][1],MXNAME-1);
ISC_LIST_APPEND(server_list, srv, link);
} else if ((strcmp(argv[0],"+vc") == 0)
&& (!is_batchfile)) {
tcp_mode = ISC_TRUE;
} else if (strcmp(argv[0],"+norecurs") == 0) {
recurse = ISC_FALSE;
} else if (strcmp(argv[0],"-f") == 0) {
batchname=argv[1];
argv++;
argc--;
} else {
if (have_host) {
ENSURE ( lookup != NULL );
if (isclass(argv[0])) {
strncpy (lookup->rctext,argv[0],
MXRD);
continue;
} else if (istype(argv[0])) {
strncpy (lookup->rttext,argv[0],
MXRD);
continue;
}
}
lookup = isc_mem_allocate (mctx,
sizeof(struct dig_lookup));
if (lookup == NULL)
fatal ("Memory allocation failure.");
lookup->pending = ISC_FALSE;
strncpy (lookup->textname,argv[0], MXNAME-1);
lookup->rttext[0]=0;
lookup->rctext[0]=0;
lookup->namespace[0]=0;
lookup->sendspace[0]=0;
lookup->sendmsg=NULL;
lookup->name=NULL;
lookup->timer = NULL;
lookup->xfr_q = NULL;
lookup->doing_xfr = ISC_FALSE;
ISC_LIST_INIT(lookup->q);
ISC_LIST_APPEND(lookup_list, lookup, link);
have_host = ISC_TRUE;
}
}
if (batchname != NULL) {
fp = fopen (batchname, "r");
if (fp == NULL) {
perror (batchname);
fatal ("Couldn't open specified batch file.");
}
while (fgets (batchline, MXNAME, fp) != 0) {
bargc = sscanf ("%s %s %s %s %s %s %s",
bargv[1], bargv[2], bargv[3],
bargv[4], bargv[5], bargv[6],
bargv[7]);
bargc++;
strcpy (bargv[0], "dig");
parse_args(ISC_TRUE, bargc, (char**)bargv);
}
}
if (lookup_list.head == NULL) {
lookup = isc_mem_allocate (mctx,
sizeof(struct dig_lookup));
if (lookup == NULL)
fatal ("Memory allocation failure.");
lookup->pending = ISC_FALSE;
lookup->rctext[0]=0;
lookup->namespace[0]=0;
lookup->sendspace[0]=0;
lookup->sendmsg=NULL;
lookup->name=NULL;
lookup->timer = NULL;
lookup->xfr_q = NULL;
lookup->doing_xfr = ISC_FALSE;
ISC_LIST_INIT(lookup->q);
strcpy (lookup->textname,".");
strcpy (lookup->rttext, "NS");
lookup->rctext[0]=0;
ISC_LIST_APPEND(lookup_list, lookup, link);
}
}
static void
setup_system() {
char rcinput[MXNAME];
FILE *fp;
char *ptr;
dig_server_t *srv;
port = 53;
timeout = 10;
id = getpid()<<8;
if (server_list.head == NULL) {
fp = fopen (RESOLVCONF, "r");
if (fp != NULL) {
while (fgets(rcinput, MXNAME, fp) != 0) {
ptr = strtok (rcinput, " \t");
if (ptr != NULL) {
if (strcasecmp(ptr,"nameserver")
== 0) {
ptr = strtok (NULL, " \t");
if (ptr != NULL) {
srv=isc_mem_allocate (mctx, sizeof(struct dig_server));
if (srv == NULL)
fatal ("Memory allocation failure.");
strncpy(srv->servername, ptr,MXNAME-1);
ISC_LIST_APPEND(server_list, srv, link);
}
}
}
}
fclose (fp);
}
}
if (server_list.head == NULL) {
srv = isc_mem_allocate(mctx, sizeof(dig_server_t));
if (srv == NULL)
fatal ("Memory allocation failure");
strcpy (srv->servername, "127.0.0.1");
ISC_LIST_APPEND(server_list, srv, link);
}
}
static void
setup_libs() {
isc_result_t result;
isc_buffer_t b;
result = isc_app_start();
check_result (result, "isc_app_start");
result = isc_net_probeipv4();
check_result (result, "isc_net_probeipv4");
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");
result = isc_taskmgr_create (mctx, 1, 0, &taskmgr);
check_result (result, "isc_taskmgr_create");
result = isc_task_create (taskmgr, 0, &task);
check_result (result, "isc_task_create");
result = isc_timermgr_create (mctx, &timermgr);
check_result (result, "isc_timermgr_create");
result = isc_socketmgr_create (mctx, &socketmgr);
check_result (result, "isc_socketmgr_create");
isc_buffer_init (&b, ".", 1, ISC_BUFFERTYPE_TEXT);
isc_buffer_add (&b, 1);
dns_name_init (&rootorg, NULL);
isc_buffer_init (&rootbuf, rootspace, BUFSIZE,
ISC_BUFFERTYPE_BINARY);
result = dns_name_fromtext (&rootorg, &b, NULL,
ISC_FALSE, &rootbuf);
check_result (result, "dns_name_fromtext");
}
static void
add_type(dns_message_t *message, dns_name_t *name, dns_rdataclass_t rdclass,
dns_rdatatype_t rdtype)
{
dns_rdataset_t *rdataset;
isc_result_t result;
rdataset = NULL;
result = dns_message_gettemprdataset(message, &rdataset);
check_result(result, "dns_message_gettemprdataset()");
dns_rdataset_init(rdataset);
dns_rdataset_makequestion(rdataset, rdclass, rdtype);
ISC_LIST_APPEND(name->list, rdataset, link);
}
static void
setup_lookup(dig_lookup_t *lookup) {
isc_result_t result;
int len;
dns_rdatatype_t rdtype;
dns_rdataclass_t rdclass;
dig_server_t *serv;
dig_query_t *query;
isc_textregion_t r;
isc_buffer_t b;
#ifdef DEBUG
printf ("Setting up for looking up %s\n",lookup->textname);
#endif
len=strlen(lookup->textname);
isc_buffer_init (&b, lookup->textname, len,
ISC_BUFFERTYPE_TEXT);
isc_buffer_add (&b, len);
result = dns_message_create(mctx, DNS_MESSAGE_INTENTRENDER,
&lookup->sendmsg);
check_result (result, "dns_message_create");
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, BUFSIZE,
ISC_BUFFERTYPE_BINARY);
result = dns_name_fromtext (lookup->name, &b, &rootorg,
ISC_FALSE, &lookup->namebuf);
check_result (result, "dns_name_fromtext");
if (lookup->rctext[0] == 0)
strcpy (lookup->rctext, "IN");
if (lookup->rttext[0] == 0)
strcpy (lookup->rttext, "A");
lookup->sendmsg->id = id++;
lookup->sendmsg->opcode = dns_opcode_query;
if (recurse)
lookup->sendmsg->flags |= DNS_MESSAGEFLAG_RD;
dns_message_addname(lookup->sendmsg, lookup->name,
DNS_SECTION_QUESTION);
r.base=lookup->rttext;
r.length=strlen(lookup->rttext);
result = dns_rdatatype_fromtext(&rdtype, &r);
check_result (result, "dns_rdatatype_fromtext");
if (rdtype == dns_rdatatype_axfr)
lookup->doing_xfr = ISC_TRUE;
r.base=lookup->rctext;
r.length=strlen(lookup->rctext);
result = dns_rdataclass_fromtext(&rdclass, &r);
check_result (result, "dns_rdataclass_fromtext");
add_type(lookup->sendmsg, lookup->name, rdclass, rdtype);
isc_buffer_init (&lookup->sendbuf, lookup->sendspace, COMMSIZE,
ISC_BUFFERTYPE_BINARY);
result = dns_message_renderbegin(lookup->sendmsg, &lookup->sendbuf);
check_result (result, "dns_message_renderbegin");
result = dns_message_rendersection(lookup->sendmsg,
DNS_SECTION_QUESTION,0);
check_result (result, "dns_message_rendersection");
result = dns_message_renderend(lookup->sendmsg);
check_result (result, "dns_message_renderend");
lookup->pending = ISC_FALSE;
for (serv = ISC_LIST_HEAD(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.");
query->lookup = lookup;
query->working = ISC_FALSE;
query->waiting_connect = ISC_FALSE;
query->first_pass = ISC_TRUE;
query->first_soa_rcvd = ISC_FALSE;
query->servname = serv->servername;
ISC_LIST_INIT (query->sendlist);
ISC_LIST_INIT (query->recvlist);
ISC_LIST_INIT (query->lengthlist);
query->sock = NULL;
isc_buffer_init (&query->recvbuf, query->recvspace,
COMMSIZE, ISC_BUFFERTYPE_BINARY);
isc_buffer_init (&query->lengthbuf, query->lengthspace,
2, ISC_BUFFERTYPE_BINARY);
isc_buffer_init (&query->slbuf, query->slspace,
2, ISC_BUFFERTYPE_BINARY);
ISC_LIST_ENQUEUE (lookup->q, query, link);
}
}
static void
send_done (isc_task_t *task, isc_event_t *event) {
UNUSED (task);
isc_event_free (&event);
}
static void
cancel_lookup (dig_lookup_t *lookup) {
dig_query_t *query;
#ifdef DEBUG
puts ("Cancelling all queries");
#endif
if (!lookup->pending)
return;
lookup->pending = ISC_FALSE;
for (query = ISC_LIST_HEAD(lookup->q);
query != NULL;
query = ISC_LIST_NEXT(query, link)) {
if (query->working) {
isc_socket_cancel (query->sock, task,
ISC_SOCKCANCEL_ALL);
}
}
}
static void
do_lookup_udp (dig_lookup_t *lookup);
static void
check_next_lookup (dig_lookup_t *lookup) {
dig_lookup_t *next;
dig_query_t *query;
isc_boolean_t still_working=ISC_FALSE;
#ifdef DEBUG
puts ("In check_next_lookup");
#endif
for (query = ISC_LIST_HEAD(lookup->q);
query != NULL;
query = ISC_LIST_NEXT(query, link)) {
if (query->working) {
#ifdef DEBUG
puts ("Still have a worker.");
#endif
still_working=ISC_TRUE;
}
}
if (still_working)
return;
next = ISC_LIST_NEXT (lookup, link);
if (next == NULL) {
#ifdef DEBUG
puts ("Shutting Down.");
#endif
isc_app_shutdown();
return;
}
setup_lookup(next);
#ifdef NEVER
if (tcp_mode)
do_lookup_tcp(next);
else
#endif
do_lookup_udp(next);
}
/* connect_timeout is used for both UDP recieves and TCP connects. */
static void
connect_timeout (isc_task_t *task, isc_event_t *event) {
dig_lookup_t *lookup;
dig_query_t *q=NULL;
isc_result_t result;
isc_buffer_t *b;
isc_region_t r;
lookup=event->ev_arg;
REQUIRE (event->ev_type == ISC_TIMEREVENT_IDLE);
result = isc_buffer_allocate(mctx, &b, 256, ISC_BUFFERTYPE_TEXT);
check_result (result, "isc_buffer_allocate");
for (q = ISC_LIST_HEAD(lookup->q);
q != NULL;
q = ISC_LIST_NEXT(q, link)) {
if (q->working) {
isc_buffer_clear (b);
result = isc_sockaddr_totext(&q->sockaddr, b);
check_result (result, "isc_sockaddr_totext");
isc_buffer_used(b, &r);
printf (";; Connection to server %.*s for %s failed: Connection timed out.\n",
(int)r.length, r.base, q->lookup->textname);
isc_socket_cancel(q->sock, task, ISC_SOCKCANCEL_ALL);
}
}
ENSURE (lookup->timer != NULL);
isc_timer_detach (&lookup->timer);
isc_buffer_free (&b);
isc_event_free (&event);
}
static void
recv_done (isc_task_t *task, isc_event_t *event) ;
static void
tcp_length_done (isc_task_t *task, isc_event_t *event) {
isc_socketevent_t *sevent;
isc_buffer_t *b=NULL;
isc_region_t r;
isc_result_t result;
dig_query_t *query=NULL;
isc_uint16_t length;
UNUSED (task);
#ifdef DEBUG
puts ("In tcp_length_done");
#endif
REQUIRE (event->ev_type == ISC_SOCKEVENT_RECVDONE);
sevent = (isc_socketevent_t *)event;
query = event->ev_arg;
if (sevent->result == ISC_R_CANCELED) {
query->working = ISC_FALSE;
isc_socket_detach (&query->sock);
check_next_lookup(query->lookup);
isc_event_free (&event);
return;
}
if (sevent->result != ISC_R_SUCCESS) {
result = isc_buffer_allocate(mctx, &b, 256,
ISC_BUFFERTYPE_TEXT);
check_result (result, "isc_buffer_allocate");
result = isc_sockaddr_totext(&query->sockaddr, b);
check_result (result, "isc_sockaddr_totext");
isc_buffer_used(b, &r);
printf ("%.*s: %s\n",(int)r.length, r.base,
isc_result_totext(sevent->result));
isc_buffer_free (&b);
query->working = ISC_FALSE;
isc_socket_detach (&query->sock);
check_next_lookup(query->lookup);
isc_event_free (&event);
return;
}
b = ISC_LIST_HEAD(sevent->bufferlist);
ISC_LIST_DEQUEUE (sevent->bufferlist, &query->lengthbuf, link);
length = isc_buffer_getuint16(b);
if (length > COMMSIZE)
fatal ("Length was longer than I can handle!");
/* XXXMWS Fix the above. */
/* 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, ISC_BUFFERTYPE_BINARY);
ENSURE (ISC_LIST_EMPTY (query->recvlist));
ISC_LIST_ENQUEUE (query->recvlist, &query->recvbuf, link);
result = isc_socket_recvv (query->sock, &query->recvlist,
length, task, recv_done,
query);
check_result (result, "isc_socket_recvv");
#ifdef DEBUG
printf ("Resubmitted recv request with length %d\n",length);
#endif
isc_event_free (&event);
}
static void
launch_next_query(dig_query_t *query, isc_boolean_t include_question) {
isc_result_t result;
if (!query->lookup->pending) {
#ifdef DEBUG
puts ("Ignoring launch_next_query because !pending.");
#endif
isc_socket_detach (&query->sock);
query->working = ISC_FALSE;
query->waiting_connect = ISC_FALSE;
check_next_lookup (query->lookup);
return;
}
isc_buffer_clear(&query->slbuf);
isc_buffer_clear(&query->lengthbuf);
isc_buffer_putuint16(&query->slbuf, query->lookup->sendbuf.used);
ISC_LIST_ENQUEUE(query->sendlist, &query->slbuf, link);
if (include_question)
ISC_LIST_ENQUEUE(query->sendlist, &query->lookup->sendbuf,
link);
ISC_LIST_ENQUEUE(query->lengthlist, &query->lengthbuf, link);
result = isc_socket_recvv(query->sock, &query->lengthlist, 0, task,
tcp_length_done, query);
check_result (result, "isc_socket_recvv");
sendcount++;
#ifdef DEBUG
puts ("Sending a request.");
#endif
result = isc_socket_sendv(query->sock, &query->sendlist, task,
send_done, query);
check_result (result, "isc_socket_recvv");
query->waiting_connect = ISC_FALSE;
check_next_lookup(query->lookup);
return;
}
static void
connect_done (isc_task_t *task, isc_event_t *event) {
isc_result_t result;
isc_socketevent_t *sevent;
dig_query_t *query;
isc_buffer_t *b;
isc_region_t r;
UNUSED (task);
REQUIRE (event->ev_type == ISC_SOCKEVENT_CONNECT);
sevent = (isc_socketevent_t *)event;
query = sevent->ev_arg;
REQUIRE (query->waiting_connect);
query->waiting_connect = ISC_FALSE;
#ifdef DEBUG
puts ("In connect_done.");
#endif
if (sevent->result != ISC_R_SUCCESS) {
result = isc_buffer_allocate(mctx, &b, 256,
ISC_BUFFERTYPE_TEXT);
check_result (result, "isc_buffer_allocate");
result = isc_sockaddr_totext(&query->sockaddr, b);
check_result (result, "isc_sockaddr_totext");
isc_buffer_used(b, &r);
printf (";; Connection to server %.*s for %s failed: %s.\n",
(int)r.length, r.base, query->lookup->textname,
isc_result_totext(sevent->result));
isc_buffer_free(&b);
query->working = ISC_FALSE;
query->waiting_connect = ISC_FALSE;
check_next_lookup(query->lookup);
isc_event_free (&event);
return;
}
isc_event_free (&event);
launch_next_query (query, ISC_TRUE);
}
static isc_boolean_t
msg_contains_soa(dns_message_t *msg, dig_query_t *query) {
isc_result_t result;
dns_name_t *name=NULL;
result = dns_message_findname (msg, DNS_SECTION_ANSWER,
query->lookup->name, dns_rdatatype_soa,
0, &name, NULL);
if (result == ISC_R_SUCCESS) {
#ifdef DEBUG
puts ("Found SOA");
#endif
return (ISC_TRUE);
} else {
#ifdef DEBUG
printf ("Didn't find SOA, result=%d:%s\n",
result, dns_result_totext(result));
#endif
return (ISC_FALSE);
}
}
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;
isc_result_t result;
isc_buffer_t ab;
char abspace[MXNAME];
isc_region_t r;
UNUSED (task);
sendcount--;
#ifdef DEBUG
printf ("In recv_done, counter down to %d\n",sendcount);
#endif
REQUIRE (event->ev_type == ISC_SOCKEVENT_RECVDONE);
sevent = (isc_socketevent_t *)event;
query = event->ev_arg;
if (!query->lookup->pending) {
#ifdef DEBUG
printf ("No longer pending. Got %s\n",
isc_result_totext (sevent->result));
#endif
query->working = ISC_FALSE;
query->waiting_connect = ISC_FALSE;
cancel_lookup (query->lookup);
check_next_lookup(query->lookup);
isc_event_free (&event);
return;
}
if (sevent->result == ISC_R_SUCCESS) {
b = ISC_LIST_HEAD(sevent->bufferlist);
ISC_LIST_DEQUEUE(sevent->bufferlist, &query->recvbuf, link);
result = dns_message_create(mctx, DNS_MESSAGE_INTENTPARSE,
&msg);
check_result (result, "dns_message_create");
result = dns_message_parse(msg, b, ISC_TRUE);
if (result != ISC_R_SUCCESS)
hex_dump (b);
check_result (result, "dns_message_parse");
if (query->lookup->xfr_q == NULL)
query->lookup->xfr_q = query;
if (query->lookup->xfr_q == query) {
if (query->first_soa_rcvd &&
query->lookup->doing_xfr)
printmessage(msg, ISC_FALSE);
else
printmessage (msg, ISC_TRUE);
}
#ifdef DEBUG
if (query->lookup->pending)
puts ("Still pending.");
#endif
if (query->lookup->doing_xfr) {
if (!query->first_soa_rcvd) {
if (!msg_contains_soa(msg,query)) {
puts ("; Transfer failed. Didn't start with SOA answer.");
query->working = ISC_FALSE;
check_next_lookup (query->lookup);
isc_event_free (&event);
return;
}
else {
query->first_soa_rcvd = ISC_TRUE;
launch_next_query (query, ISC_FALSE);
}
}
else {
if (msg_contains_soa(msg, query)) {
cancel_lookup (query->lookup);
query->working = ISC_FALSE;
check_next_lookup (query->lookup);
isc_event_free (&event);
return;
}
else {
launch_next_query (query, ISC_FALSE);
}
}
}
else {
query->working = ISC_FALSE;
cancel_lookup (query->lookup);
}
if (!query->lookup->pending) {
isc_buffer_init (&ab, abspace, MXNAME,
ISC_BUFFERTYPE_TEXT);
check_result (result,"isc_buffer_init");
result = isc_sockaddr_totext (&sevent->address, &ab);
check_result (result, "isc_sockaddr_totext");
isc_buffer_used (&ab, &r);
printf ("; Received %u bytes from %s\n",
b->used, r.base);
check_next_lookup (query->lookup);
}
dns_message_destroy (&msg);
isc_event_free (&event);
return;
}
/* In truth, we should never get into the CANCELED routine, since
the cancel_lookup() routine clears the pending flag. */
if (sevent->result == ISC_R_CANCELED) {
query->working = ISC_FALSE;
query->waiting_connect = ISC_FALSE;
check_next_lookup(query->lookup);
isc_event_free (&event);
return;
}
fatal ("recv_done got result %s",isc_result_totext(sevent->result));
}
static void
get_address(char *hostname, in_port_t port, isc_sockaddr_t *sockaddr) {
struct in_addr in4;
struct in6_addr in6;
struct hostent *he;
if (have_ipv6 && inet_pton(AF_INET6, hostname, &in6) == 1)
isc_sockaddr_fromin6(sockaddr, &in6, port);
else if (inet_pton(AF_INET, hostname, &in4) == 1)
isc_sockaddr_fromin(sockaddr, &in4, port);
else {
he = gethostbyname(hostname);
if (he == NULL)
fatal("gethostbyname() failed, h_errno = %d",
h_errno);
INSIST(he->h_addrtype == AF_INET);
isc_sockaddr_fromin(sockaddr,
(struct in_addr *)(he->h_addr_list[0]),
port);
}
}
static void
do_lookup_tcp (dig_lookup_t *lookup) {
dig_query_t *query;
isc_result_t result;
#ifdef DEBUG
puts ("Starting a TCP lookup");
#endif
lookup->pending = ISC_TRUE;
isc_interval_set (&lookup->interval, timeout, 0);
result = isc_timer_create (timermgr, isc_timertype_once,
NULL, &lookup->interval, task,
connect_timeout, lookup,
&lookup->timer);
check_result (result, "isc_timer_create");
for (query = ISC_LIST_HEAD(lookup->q);
query != NULL;
query = ISC_LIST_NEXT(query, link)) {
query->working = ISC_TRUE;
query->waiting_connect = ISC_TRUE;
get_address(query->servname, port, &query->sockaddr);
result = isc_socket_create (socketmgr,
isc_sockaddr_pf(&query->sockaddr),
isc_sockettype_tcp,
&query->sock) ;
check_result (result, "isc_socket_create");
result = isc_socket_connect (query->sock,
&query->sockaddr, task,
connect_done, query);
check_result (result, "isc_socket_connect");
}
}
static void
do_lookup_udp (dig_lookup_t *lookup) {
dig_query_t *query;
isc_result_t result;
#ifdef DEBUG
puts ("Starting a UDP lookup.");
#endif
lookup->pending = ISC_TRUE;
isc_interval_set (&lookup->interval, timeout, 0);
result = isc_timer_create (timermgr, isc_timertype_once,
NULL, &lookup->interval, task,
connect_timeout, lookup,
&lookup->timer);
check_result (result, "isc_timer_create");
for (query = ISC_LIST_HEAD(lookup->q);
query != NULL;
query = ISC_LIST_NEXT(query, link)) {
query->working = ISC_TRUE;
query->waiting_connect = ISC_FALSE;
get_address(query->servname, port, &query->sockaddr);
result = isc_socket_create (socketmgr,
isc_sockaddr_pf(&query->sockaddr),
isc_sockettype_udp,
&query->sock) ;
check_result (result, "isc_socket_create");
ISC_LIST_ENQUEUE (query->recvlist, &query->recvbuf, link);
result = isc_socket_recvv (query->sock, &query->recvlist,
1, task, recv_done, query);
check_result (result, "isc_socket_recvv");
sendcount++;
#ifdef DEBUG
printf ("Sent count number %d\n",sendcount);
#endif
ISC_LIST_ENQUEUE (query->sendlist, &lookup->sendbuf, link);
result = isc_socket_sendtov(query->sock, &query->sendlist,
task, send_done, query,
&query->sockaddr, NULL);
check_result (result, "isc_socket_sendtov");
}
}
static void
free_lists() {
void *ptr;
dig_lookup_t *l;
dig_query_t *q;
dig_server_t *s;
l = ISC_LIST_HEAD(lookup_list);
while (l != NULL) {
q = ISC_LIST_HEAD(l->q);
while (q != NULL) {
if (q->sock != NULL)
isc_socket_detach (&q->sock);
if (ISC_LINK_LINKED (&q->recvbuf, link))
ISC_LIST_DEQUEUE (q->recvlist,
&q->recvbuf, link);
if (ISC_LINK_LINKED (&q->lengthbuf, link))
ISC_LIST_DEQUEUE (q->lengthlist,
&q->lengthbuf, link);
isc_buffer_invalidate (&q->recvbuf);
isc_buffer_invalidate (&q->lengthbuf);
ptr = q;
q = ISC_LIST_NEXT(q, link);
isc_mem_free (mctx, ptr);
}
if (l->sendmsg != NULL)
dns_message_destroy (&l->sendmsg);
if (l->timer != NULL)
isc_timer_detach (&l->timer);
ptr = l;
l = ISC_LIST_NEXT(l, link);
isc_mem_free (mctx, ptr);
}
s = ISC_LIST_HEAD(server_list);
while (s != NULL) {
ptr = s;
s = ISC_LIST_NEXT(s, link);
isc_mem_free (mctx, ptr);
}
dns_name_invalidate (&rootorg);
if (socketmgr != NULL)
isc_socketmgr_destroy (&socketmgr);
if (timermgr != NULL)
isc_timermgr_destroy (&timermgr);
if (task != NULL)
isc_task_detach (&task);
if (taskmgr != NULL)
isc_taskmgr_destroy (&taskmgr);
}
int
main (int argc, char **argv) {
dig_lookup_t *lookup = NULL;
ISC_LIST_INIT(lookup_list);
ISC_LIST_INIT(server_list);
setup_libs();
parse_args(ISC_FALSE, argc, argv);
setup_system();
lookup = ISC_LIST_HEAD(lookup_list);
setup_lookup(lookup);
if (tcp_mode)
do_lookup_tcp(lookup);
else
do_lookup_udp(lookup);
isc_app_run();
free_lists();
#ifdef MEMDEBUG
isc_mem_stats(mctx, stderr);
#endif
isc_app_finish();
return (0);
}
Reference in New Issue View Git Blame Copy Permalink