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lookup SRV-records to find a kdc for a realm

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git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@5928 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Johan Danielsson
1999-04-11 00:37:44 +00:00
parent 4ea526ace0
commit 20ed3440e0
1 changed files with 87 additions and 10 deletions
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97
lib/krb5/krbhst.c
View File

@@ -37,9 +37,74 @@
*/
#include "krb5_locl.h"
#include <resolve.h>
RCSID("$Id$");
static int
add_string(char ***res, int *count, const char *string)
{
char **tmp = realloc(*res, (*count + 1) * sizeof(**res));
if(tmp == NULL)
return ENOMEM;
*res = tmp;
if(string) {
tmp[*count] = strdup(string);
if(tmp[*count] == NULL)
return ENOMEM;
} else
tmp[*count] = NULL;
(*count)++;
return 0;
}
static krb5_error_code
srv_find_realm(krb5_context context, char ***res, int *count,
const char *realm, const char *proto, const char *service)
{
char domain[1024];
char alt_domain[1024];
krb5_error_code ret;
struct dns_reply *r;
struct resource_record *rr;
snprintf(domain, sizeof(domain), "_%s._%s.%s.", service, proto, realm);
r = dns_lookup(domain, "srv");
if(r == NULL && context->srv_try_rfc2052) {
snprintf(alt_domain, sizeof(alt_domain), "%s.%s.%s.",
service, proto, realm);
r = dns_lookup(alt_domain, "srv");
}
if(r == NULL && context->srv_try_txt)
r = dns_lookup(domain, "txt");
if(r == NULL && context->srv_try_rfc2052 && context->srv_try_txt)
r = dns_lookup(alt_domain, "txt");
if(r == NULL)
return 0;
for(rr = r->head; rr; rr = rr->next){
if(rr->type == T_SRV){
char buf[1024];
*res = realloc(*res, (*count + 1) * sizeof(**res));
snprintf (buf, sizeof(buf),
"%s/%s:%u",
proto,
rr->u.srv->target,
rr->u.srv->port);
ret = add_string(res, count, buf);
if(ret)
return ret;
}else if(rr->type == T_TXT) {
ret = add_string(res, count, rr->u.txt);
if(ret)
return ret;
}
}
dns_free_data(r);
return 0;
}
static krb5_error_code
get_krbhst (krb5_context context,
const krb5_realm *realm,
@@ -48,21 +113,33 @@ get_krbhst (krb5_context context,
{
char **res, **r;
int count;
krb5_error_code ret;
res = krb5_config_get_strings(context, NULL,
"realms", *realm, conf_string, NULL);
for(r = res, count = 0; r && *r; r++, count++);
r = realloc(res, (count + 2) * sizeof(*res));
if(r == NULL){
krb5_config_free_strings(res);
return ENOMEM;
if(context->srv_lookup) {
char *s[] = { "udp", "tcp", "http" }, **q;
for(q = s; q < s + sizeof(s) / sizeof(s[0]); q++) {
ret = srv_find_realm(context, &res, &count, *realm, *q, "kerberos");
if(ret) {
krb5_config_free_strings(res);
return ret;
}
}
}
res = r;
asprintf(&res[count], "kerberos.%s", *realm);
if(res[count] == NULL){
krb5_config_free_strings(res);
return ENOMEM;
if(count == 0) {
char buf[1024];
snprintf(buf, sizeof(buf), "kerberos.%s", *realm);
ret = add_string(&res, &count, buf);
if(ret) {
krb5_config_free_strings(res);
return ret;
}
}
res[count + 1] = NULL;
add_string(&res, &count, NULL);
*hostlist = res;
return 0;
}