Copyright (C) Andrew Tridgell 2005
Copyright (C) Stefan Metzmacher 2008
+ Copyright (C) Matthieu Patou 2011
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
return 0;
}
-/*
- the blocking child
-*/
-static void run_child_dns_lookup(struct dns_ex_state *state, int fd)
+static uint32_t count_dns_rr(struct rk_resource_record *head, unsigned record_type)
{
- struct rk_dns_reply *reply;
- struct rk_resource_record *rr;
uint32_t count = 0;
- uint32_t srv_valid = 0;
- struct rk_resource_record **srv_rr;
- uint32_t addrs_valid = 0;
- struct rk_resource_record **addrs_rr;
- struct rk_dns_reply **srv_replies = NULL;
- char *addrs;
- bool first;
- uint32_t i;
- bool do_srv = (state->flags & RESOLVE_NAME_FLAG_DNS_SRV);
+ struct rk_resource_record *rr;
- if (strchr(state->name.name, '.') && state->name.name[strlen(state->name.name)-1] != '.') {
- /* we are asking for a fully qualified name, but the
- name doesn't end in a '.'. We need to prevent the
- DNS library trying the search domains configured in
- resolv.conf */
- state->name.name = talloc_strdup_append(discard_const_p(char, state->name.name),
- ".");
+ for (rr=head; rr; rr=rr->next) {
+
+ /* we are only interested in the IN class */
+ if (rr->class != rk_ns_c_in) {
+ continue;
+ }
+
+ /* we are only interested by requested record */
+ if (rr->type != record_type) {
+ continue;
+ }
+
+ switch(record_type) {
+ case rk_ns_t_srv:
+
+ /* verify we actually have a SRV record here */
+ if (!rr->u.srv) {
+ continue;
+ }
+
+ /* Verify we got a port */
+ if (rr->u.srv->port == 0) {
+ continue;
+ }
+ count++;
+ break;
+ case rk_ns_t_a:
+ case rk_ns_t_aaaa:
+ /* verify we actually have a record here */
+ if (!rr->u.data) {
+ continue;
+ }
+ count++;
+ break;
+ default:
+ count++;
+ break;
+ }
+ }
+
+ return count;
+}
+
+struct dns_records_container {
+ char **list;
+ uint32_t count;
+};
+
+static char* rr_to_string(TALLOC_CTX *mem_ctx,
+ struct rk_resource_record *rr,
+ uint16_t port)
+{
+ char addrstr[INET6_ADDRSTRLEN];
+ char *addr;
+
+ switch (rr->type) {
+ case rk_ns_t_a:
+ if (inet_ntop(AF_INET, rr->u.a,
+ addrstr, sizeof(addrstr)) == NULL) {
+ return NULL;
+ }
+ break;
+#ifdef HAVE_IPV6
+ case rk_ns_t_aaaa:
+ if (inet_ntop(AF_INET6, (struct in6_addr *)rr->u.data,
+ addrstr, sizeof(addrstr)) == NULL) {
+ return NULL;
+ }
+ break;
+#endif
+ default:
+ return NULL;
}
+ addr = talloc_asprintf(mem_ctx, "%s@%u/%s", addrstr,
+ port, rr->domain);
+
+ return addr;
+}
+
+static struct dns_records_container get_a_aaaa_records(TALLOC_CTX *mem_ctx,
+ const char* name,
+ int port)
+{
+ struct rk_dns_reply *reply, *reply2, *rep, *tmp[3];
+ struct rk_resource_record *rr;
+ struct dns_records_container ret;
+ char **addrs = NULL;
+ uint32_t count, count2, total;
+ uint32_t i;
+
+ memset(&ret, 0, sizeof(struct dns_records_container));
/* this is the blocking call we are going to lots of trouble
- to avoid in the parent */
- reply = rk_dns_lookup(state->name.name, do_srv?"SRV":"A");
+ to avoid them in the parent */
+ reply = rk_dns_lookup(name, "AAAA");
+
if (!reply) {
- goto done;
+ return ret;
}
- if (do_srv) {
- rk_dns_srv_order(reply);
- }
+ count = count_dns_rr(reply->head, rk_ns_t_aaaa);
+ count2 = count_dns_rr(reply->head, rk_ns_t_a);
- /* Loop over all returned records and pick the "srv" records */
- for (rr=reply->head; rr; rr=rr->next) {
- /* we are only interested in the IN class */
- if (rr->class != rk_ns_c_in) {
- continue;
+ if (!count2) {
+ /*
+ * DNS server didn't returned A when asked for AAAA records.
+ * Most of the server do it, let's ask for A specificaly.
+ */
+ reply2 = rk_dns_lookup(name, "A");
+
+ if (!reply2) {
+ return ret;
}
- if (do_srv) {
- /* we are only interested in SRV records */
- if (rr->type != rk_ns_t_srv) {
- continue;
- }
+ count2 = count_dns_rr(reply2->head, rk_ns_t_a);
+ } else {
+ reply2 = NULL;
+ }
- /* verify we actually have a SRV record here */
- if (!rr->u.srv) {
- continue;
- }
+ count += count2;
- /* Verify we got a port */
- if (rr->u.srv->port == 0) {
+ if (count == 0) {
+ goto done;
+ }
+
+ addrs = talloc_zero_array(mem_ctx, char*, count);
+ total = 0;
+
+ tmp[0] = reply;
+ tmp[1] = reply2;
+ tmp[2] = NULL;
+
+ /* Loop over all returned records and pick the records */
+ for (i=0; tmp[i] != NULL; i++) {
+ rep = tmp[i];
+ for (rr=rep->head; rr; rr=rr->next) {
+ /* we are only interested in the IN class */
+ if (rr->class != rk_ns_c_in) {
continue;
}
- } else {
- /* we are only interested in A or AAAA records */
+
+ /* we are only interested in A and AAAA records */
if (rr->type != rk_ns_t_a && rr->type != rk_ns_t_aaaa) {
continue;
}
if (!rr->u.data) {
continue;
}
+ rr_to_string(mem_ctx, rr, port);
+ addrs[total] = rr_to_string(mem_ctx, rr, port);
+ if (addrs[total]) {
+ total++;
+ }
}
- count++;
}
-
- if (count == 0) {
- goto done;
+ if (total) {
+ ret.count = total;
+ ret.list = addrs;
}
- srv_rr = talloc_zero_array(state,
- struct rk_resource_record *,
- count);
- if (!srv_rr) {
- goto done;
- }
+done:
+ if (reply != NULL)
+ rk_dns_free_data(reply);
- addrs_rr = talloc_zero_array(state,
- struct rk_resource_record *,
- count);
- if (!addrs_rr) {
- goto done;
+ if (reply2 != NULL)
+ rk_dns_free_data(reply2);
+
+ return ret;
+}
+
+static struct dns_records_container get_srv_records(TALLOC_CTX *mem_ctx,
+ const char* name)
+{
+ struct rk_dns_reply *reply;
+ struct rk_resource_record *rr;
+ struct dns_records_container ret;
+ char **addrs = NULL;
+ uint32_t count, total;
+
+ memset(&ret, 0, sizeof(struct dns_records_container));
+ /* this is the blocking call we are going to lots of trouble
+ to avoid them in the parent */
+ reply = rk_dns_lookup(name, "SRV");
+
+ if (!reply) {
+ return ret;
}
- srv_replies = talloc_zero_array(state,
- struct rk_dns_reply *,
- count);
- if (!srv_replies) {
+ rk_dns_srv_order(reply);
+ count = count_dns_rr(reply->head, rk_ns_t_srv);
+
+ total = 0;
+ if (count == 0) {
goto done;
}
/* Loop over all returned records and pick the records */
- for (rr=reply->head;rr;rr=rr->next) {
+ for (rr=reply->head; rr; rr=rr->next) {
+ struct dns_records_container c;
+ char* tmp_str;
/* we are only interested in the IN class */
if (rr->class != rk_ns_c_in) {
continue;
}
- if (do_srv) {
- /* we are only interested in SRV records */
- if (rr->type != rk_ns_t_srv) {
- continue;
- }
+ /* we are only interested in SRV records */
+ if (rr->type != rk_ns_t_srv) {
+ continue;
+ }
- /* verify we actually have a srv record here */
- if (!rr->u.srv) {
- continue;
- }
+ /* verify we actually have a srv record here */
+ if (!rr->u.srv) {
+ continue;
+ }
- /* Verify we got a port */
- if (rr->u.srv->port == 0) {
- continue;
- }
+ /* Verify we got a port */
+ if (rr->u.srv->port == 0) {
+ continue;
+ }
+
+ tmp_str = rr->u.srv->target;
+ if (strchr(tmp_str, '.') && tmp_str[strlen(tmp_str)-1] != '.') {
+ /* we are asking for a fully qualified name, but the
+ name doesn't end in a '.'. We need to prevent the
+ DNS library trying the search domains configured in
+ resolv.conf */
+ tmp_str = talloc_asprintf(mem_ctx, "%s.", tmp_str);
+ }
- srv_rr[srv_valid] = rr;
- srv_valid++;
+ c = get_a_aaaa_records(mem_ctx, tmp_str, rr->u.srv->port);
+ total += c.count;
+ if (addrs == NULL) {
+ addrs = c.list;
} else {
- /* we are only interested in A or AAAA records */
- if (rr->type != rk_ns_t_a && rr->type != rk_ns_t_aaaa) {
- continue;
- }
+ unsigned j;
- /* verify we actually have a record record here */
- if (!rr->u.data) {
- continue;
+ addrs = talloc_realloc(mem_ctx, addrs, char*, total);
+ for (j=0; j < c.count; j++) {
+ addrs[total - j] = talloc_steal(addrs, c.list[j]);
}
-
- addrs_rr[addrs_valid] = rr;
- addrs_valid++;
}
}
- for (i=0; i < srv_valid; i++) {
- srv_replies[i] = rk_dns_lookup(srv_rr[i]->u.srv->target, "A");
- if (srv_replies[i] == NULL)
- continue;
+ if (total) {
+ ret.count = total;
+ ret.list = addrs;
+ }
- /* Add first A record to addrs_rr */
- for (rr=srv_replies[i]->head;rr;rr=rr->next) {
- if (rr->class != rk_ns_c_in) {
- continue;
- }
- /* we are only interested in A or AAAA records */
- if (rr->type != rk_ns_t_a && rr->type != rk_ns_t_aaaa) {
- continue;
- }
+done:
+ if (reply != NULL)
+ rk_dns_free_data(reply);
- /* verify we actually have a record here */
- if (!rr->u.data) {
- continue;
- }
+ return ret;
+}
+/*
+ the blocking child
+*/
+static void run_child_dns_lookup(struct dns_ex_state *state, int fd)
+{
+ bool first;
+ bool do_srv = (state->flags & RESOLVE_NAME_FLAG_DNS_SRV);
+ struct dns_records_container c;
+ char* addrs = NULL;
+ unsigned int i;
- addrs_rr[i] = rr;
- addrs_valid++;
- break;
- }
+ if (strchr(state->name.name, '.') && state->name.name[strlen(state->name.name)-1] != '.') {
+ /* we are asking for a fully qualified name, but the
+ name doesn't end in a '.'. We need to prevent the
+ DNS library trying the search domains configured in
+ resolv.conf */
+ state->name.name = talloc_strdup_append(discard_const_p(char, state->name.name),
+ ".");
}
- if (addrs_valid == 0) {
- goto done;
+
+ if (do_srv) {
+ c = get_srv_records(state, state->name.name);
+ } else {
+ c = get_a_aaaa_records(state, state->name.name, state->port);
}
addrs = talloc_strdup(state, "");
goto done;
}
first = true;
- for (i=0; i < addrs_valid; i++) {
- uint16_t port;
- char addrstr[INET6_ADDRSTRLEN];
-
- if (!addrs_rr[i]) {
- continue;
- }
-
- if (srv_rr[i] &&
- (state->flags & RESOLVE_NAME_FLAG_OVERWRITE_PORT)) {
- port = srv_rr[i]->u.srv->port;
- } else {
- port = state->port;
- }
- switch (addrs_rr[i]->type) {
- case rk_ns_t_a:
- if (inet_ntop(AF_INET, addrs_rr[i]->u.a,
- addrstr, sizeof(addrstr)) == NULL) {
- continue;
- }
- break;
-#ifdef HAVE_IPV6
- case rk_ns_t_aaaa:
- if (inet_ntop(AF_INET6, (struct in6_addr *)addrs_rr[i]->u.data,
- addrstr, sizeof(addrstr)) == NULL) {
- continue;
- }
- break;
-#endif
- default:
- continue;
- }
-
- addrs = talloc_asprintf_append_buffer(addrs, "%s%s@%u/%s",
- first?"":",",
- addrstr,
- port,
- addrs_rr[i]->domain);
- if (!addrs) {
- goto done;
- }
+ for (i=0; i < c.count; i++) {
+ addrs = talloc_asprintf_append_buffer(addrs, "%s%s",
+ first?"":",",
+ c.list[i]);
first = false;
}
if (addrs) {
+ DEBUG(11, ("Addrs = %s\n", addrs));
write(fd, addrs, talloc_get_size(addrs));
}
done:
- if (reply != NULL)
- rk_dns_free_data(reply);
- for (i=0; i < srv_valid; i++) {
- if (srv_replies[i] != NULL)
- rk_dns_free_data(srv_replies[i]);
- }
close(fd);
}
git.samba.org / sfrench / samba-autobuild / .git / commitdiff