oysteikt/heimdal
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(dns_lookup_int): grow the answer buffer to the size the server send

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to us if the answer buffer was too small (limited to the dns protocol
max packet size)


git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@14212 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Love Hörnquist Åstrand
2004-09-11 20:38:55 +00:00
parent 2218eea060
commit 15b169c7a5
1 changed files with 48 additions and 103 deletions
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151
lib/roken/resolve.c
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 1995 - 2002 Kungliga Tekniska H<>gskolan
* Copyright (c) 1995 - 2004 Kungliga Tekniska H<>gskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
@@ -465,7 +465,9 @@ parse_reply(const unsigned char *data, size_t len)
static struct dns_reply *
dns_lookup_int(const char *domain, int rr_class, int rr_type)
{
unsigned char reply[1024];
struct dns_reply *r;
unsigned char *reply = NULL;
int size;
int len;
#ifdef HAVE_RES_NSEARCH
struct __res_state stat;
@@ -476,37 +478,60 @@ dns_lookup_int(const char *domain, int rr_class, int rr_type)
u_long old_options = 0;
#endif
if (_resolve_debug) {
size = 0;
len = 1000;
do {
if (reply) {
free(reply);
reply = NULL;
}
if (size <= len)
size = len;
if (_resolve_debug) {
#ifdef HAVE_RES_NSEARCH
stat.options |= RES_DEBUG;
stat.options |= RES_DEBUG;
#elif defined(HAVE__RES)
old_options = _res.options;
_res.options |= RES_DEBUG;
old_options = _res.options;
_res.options |= RES_DEBUG;
#endif
fprintf(stderr, "dns_lookup(%s, %d, %s)\n", domain,
rr_class, dns_type_to_string(rr_type));
}
fprintf(stderr, "dns_lookup(%s, %d, %s), buffer size %d\n", domain,
rr_class, dns_type_to_string(rr_type), size);
}
reply = malloc(size);
if (reply == NULL) {
#ifdef HAVE_RES_NSEARCH
len = res_nsearch(&stat, domain, rr_class, rr_type, reply, sizeof(reply));
res_nclose(&stat);
#endif
return NULL;
}
#ifdef HAVE_RES_NSEARCH
len = res_nsearch(&stat, domain, rr_class, rr_type, reply, size);
#else
len = res_search(domain, rr_class, rr_type, reply, sizeof(reply));
len = res_search(domain, rr_class, rr_type, reply, size);
#endif
if (_resolve_debug) {
if (_resolve_debug) {
#if defined(HAVE__RES) && !defined(HAVE_RES_NSEARCH)
_res.options = old_options;
_res.options = old_options;
#endif
fprintf(stderr, "dns_lookup(%s, %d, %s) --> %d\n",
domain, rr_class, dns_type_to_string(rr_type), len);
}
fprintf(stderr, "dns_lookup(%s, %d, %s) --> %d\n",
domain, rr_class, dns_type_to_string(rr_type), len);
}
if (len < 0) {
#ifdef HAVE_RES_NSEARCH
res_nclose(&stat);
#endif
free(reply);
return NULL;
}
} while (size < len && len < rk_DNS_MAX_PACKET_SIZE);
#ifdef HAVE_RES_NSEARCH
res_nclose(&stat);
#endif
if(len < 0) {
return NULL;
} else {
len = min(len, sizeof(reply));
return parse_reply(reply, len);
}
#endif
len = min(len, size);
r = parse_reply(reply, len);
free(reply);
return r;
}
struct dns_reply *
@@ -647,83 +672,3 @@ dns_srv_order(struct dns_reply *r)
}
#endif
#ifdef TEST
int
main(int argc, char **argv)
{
struct dns_reply *r;
struct resource_record *rr;
r = dns_lookup(argv[1], argv[2]);
if(r == NULL){
printf("No reply.\n");
return 1;
}
if(r->q.type == rk_ns_t_srv)
dns_srv_order(r);
for(rr = r->head; rr;rr=rr->next){
printf("%-30s %-5s %-6d ", rr->domain, dns_type_to_string(rr->type), rr->ttl);
switch(rr->type){
case rk_ns_t_ns:
case rk_ns_t_cname:
case rk_ns_t_ptr:
printf("%s\n", (char*)rr->u.data);
break;
case rk_ns_t_a:
printf("%s\n", inet_ntoa(*rr->u.a));
break;
case rk_ns_t_mx:
case rk_ns_t_afsdb:{
printf("%d %s\n", rr->u.mx->preference, rr->u.mx->domain);
break;
}
case rk_ns_t_srv:{
struct srv_record *srv = rr->u.srv;
printf("%d %d %d %s\n", srv->priority, srv->weight,
srv->port, srv->target);
break;
}
case rk_ns_t_txt: {
printf("%s\n", rr->u.txt);
break;
}
case rk_ns_t_sig : {
struct sig_record *sig = rr->u.sig;
const char *type_string = dns_type_to_string (sig->type);
printf ("type %u (%s), algorithm %u, labels %u, orig_ttl %u, sig_expiration %u, sig_inception %u, key_tag %u, signer %s\n",
sig->type, type_string ? type_string : "",
sig->algorithm, sig->labels, sig->orig_ttl,
sig->sig_expiration, sig->sig_inception, sig->key_tag,
sig->signer);
break;
}
case rk_ns_t_key : {
struct key_record *key = rr->u.key;
printf ("flags %u, protocol %u, algorithm %u\n",
key->flags, key->protocol, key->algorithm);
break;
}
case rk_ns_t_sshfp : {
struct sshfp_record *sshfp = rr->u.sshfp;
int i;
printf ("alg %u type %u length %u data ",
sshfp->algorithm, sshfp->type, sshfp->sshfp_len);
for (i = 0; i < sshfp->sshfp_len; i++)
printf("%02X", sshfp->sshfp_data[i]);
printf("\n");
break;
}
default:
printf("\n");
break;
}
}
return 0;
}
#endif