1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2014 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
22 #include "bus-errors.h"
26 #include "resolved-dns-domain.h"
28 static int reply_query_state(DnsQuery *q) {
29 _cleanup_free_ char *ip = NULL;
33 if (q->request_hostname)
34 name = q->request_hostname;
36 r = in_addr_to_string(q->request_family, &q->request_address, &ip);
45 case DNS_QUERY_NO_SERVERS:
46 return sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_NAME_SERVERS, "No appropriate name servers or networks for name found");
48 case DNS_QUERY_TIMEOUT:
49 return sd_bus_reply_method_errorf(q->request, SD_BUS_ERROR_TIMEOUT, "Query timed out");
51 case DNS_QUERY_ATTEMPTS_MAX:
52 return sd_bus_reply_method_errorf(q->request, SD_BUS_ERROR_TIMEOUT, "All attempts to contact name servers or networks failed");
54 case DNS_QUERY_RESOURCES:
55 return sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_RESOURCES, "Not enough resources");
57 case DNS_QUERY_INVALID_REPLY:
58 return sd_bus_reply_method_errorf(q->request, BUS_ERROR_INVALID_REPLY, "Received invalid reply");
60 case DNS_QUERY_FAILURE: {
61 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
64 rcode = dns_query_get_rcode(q);
68 if (rcode == DNS_RCODE_NXDOMAIN)
69 sd_bus_error_setf(&error, _BUS_ERROR_DNS "NXDOMAIN", "'%s' not found", name);
72 char p[3]; /* the rcode is 4 bits long */
74 rc = dns_rcode_to_string(rcode);
76 sprintf(p, "%i", rcode);
80 n = strappenda(_BUS_ERROR_DNS, rc);
81 sd_bus_error_setf(&error, n, "Could not resolve '%s', server or network returned error %s", name, rc);
84 return sd_bus_reply_method_error(q->request, &error);
88 case DNS_QUERY_PENDING:
89 case DNS_QUERY_SUCCESS:
91 assert_not_reached("Impossible state");
95 static int append_address(sd_bus_message *reply, DnsResourceRecord *rr, int ifindex) {
101 r = sd_bus_message_open_container(reply, 'r', "yayi");
105 if (rr->key.type == DNS_TYPE_A) {
106 r = sd_bus_message_append(reply, "y", AF_INET);
110 r = sd_bus_message_append_array(reply, 'y', &rr->a.in_addr, sizeof(struct in_addr));
112 r = sd_bus_message_append(reply, "y", AF_INET6);
116 r = sd_bus_message_append_array(reply, 'y', &rr->aaaa.in6_addr, sizeof(struct in6_addr));
121 r = sd_bus_message_append(reply, "i", ifindex);
125 r = sd_bus_message_close_container(reply);
132 static void bus_method_resolve_hostname_complete(DnsQuery *q) {
133 _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *cname = NULL, *canonical = NULL;
134 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
135 DnsResourceRecord **rrs;
142 if (q->state != DNS_QUERY_SUCCESS) {
143 r = reply_query_state(q);
147 n = dns_query_get_rrs(q, &rrs);
153 r = sd_bus_message_new_method_return(q->request, &reply);
157 r = sd_bus_message_open_container(reply, 'a', "(yayi)");
161 ifindex = dns_query_get_ifindex(q);
165 for (i = 0; i < n; i++) {
166 r = dns_query_matches_rr(q, rrs[i]);
170 /* Hmm, if this is not an address record,
171 maybe it's a cname? If so, remember this */
172 r = dns_query_matches_cname(q, rrs[i]);
176 cname = dns_resource_record_ref(rrs[i]);
181 r = append_address(reply, rrs[i], ifindex);
186 canonical = dns_resource_record_ref(rrs[i]);
193 r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "'%s' does not have any RR of requested type", q->request_hostname);
197 /* This has a cname? Then update the query with the
199 r = dns_query_cname_redirect(q, cname->cname.name);
202 r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_CNAME_LOOP, "CNAME loop on '%s'", q->request_hostname);
204 r = sd_bus_reply_method_errno(q->request, -r, NULL);
209 /* Before we restart the query, let's see if any of
210 * the RRs we already got already answers our query */
211 for (i = 0; i < n; i++) {
212 r = dns_query_matches_rr(q, rrs[i]);
218 r = append_address(reply, rrs[i], ifindex);
223 canonical = dns_resource_record_ref(rrs[i]);
228 /* If we didn't find anything, then let's restart the
229 * query, this time with the cname */
233 r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_NAME_SERVERS, "No appropriate name servers or networks for name found");
237 r = sd_bus_reply_method_errno(q->request, -r, NULL);
244 r = sd_bus_message_close_container(reply);
248 /* Return the precise spelling and uppercasing reported by the server */
250 r = sd_bus_message_append(reply, "s", canonical->key.name);
254 r = sd_bus_send(q->manager->bus, reply, NULL);
258 r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_INVALID_REPLY, "Received invalid reply");
262 log_error("Failed to send bus reply: %s", strerror(-r));
267 static int bus_method_resolve_hostname(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
268 Manager *m = userdata;
269 const char *hostname;
271 DnsResourceKey keys[2];
280 r = sd_bus_message_read(message, "sy", &hostname, &family);
284 if (!IN_SET(family, AF_INET, AF_INET6, AF_UNSPEC))
285 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unknown address family %u", family);
287 if (!hostname_is_valid(hostname))
288 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid hostname '%s'", hostname);
290 if (family != AF_INET6) {
291 keys[n].class = DNS_CLASS_IN;
292 keys[n].type = DNS_TYPE_A;
293 keys[n].name = (char*) hostname;
297 if (family != AF_INET) {
298 keys[n].class = DNS_CLASS_IN;
299 keys[n].type = DNS_TYPE_AAAA;
300 keys[n].name = (char*) hostname;
304 r = dns_query_new(m, &q, keys, n);
308 q->request = sd_bus_message_ref(message);
309 q->request_family = family;
310 q->request_hostname = hostname;
311 q->complete = bus_method_resolve_hostname_complete;
318 sd_bus_error_setf(error, BUS_ERROR_NO_NAME_SERVERS, "No appropriate name servers or networks for name found");
326 static void bus_method_resolve_address_complete(DnsQuery *q) {
327 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
328 DnsResourceRecord **rrs;
334 if (q->state != DNS_QUERY_SUCCESS) {
335 r = reply_query_state(q);
339 n = dns_query_get_rrs(q, &rrs);
345 r = sd_bus_message_new_method_return(q->request, &reply);
349 r = sd_bus_message_open_container(reply, 'a', "s");
353 for (i = 0; i < n; i++) {
354 r = dns_query_matches_rr(q, rrs[i]);
360 r = sd_bus_message_append(reply, "s", rrs[i]->ptr.name);
368 _cleanup_free_ char *ip = NULL;
370 in_addr_to_string(q->request_family, &q->request_address, &ip);
372 r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "Address '%s' does not have any RR of requested type", ip);
376 r = sd_bus_message_close_container(reply);
380 r = sd_bus_send(q->manager->bus, reply, NULL);
384 r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_INVALID_REPLY, "Received invalid reply");
388 log_error("Failed to send bus reply: %s", strerror(-r));
393 static int bus_method_resolve_address(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
394 _cleanup_(dns_resource_key_free) DnsResourceKey key = {};
395 Manager *m = userdata;
407 r = sd_bus_message_read(message, "y", &family);
411 if (!IN_SET(family, AF_INET, AF_INET6))
412 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unknown address family %u", family);
414 r = sd_bus_message_read_array(message, 'y', &d, &sz);
418 if ((family == AF_INET && sz != sizeof(struct in_addr)) ||
419 (family == AF_INET6 && sz != sizeof(struct in6_addr)))
420 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid address size");
422 r = sd_bus_message_read(message, "i", &ifindex);
426 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid interface index");
428 key.class = DNS_CLASS_IN;
429 key.type = DNS_TYPE_PTR;
430 r = dns_name_reverse(family, d, &key.name);
434 r = dns_query_new(m, &q, &key, 1);
438 q->request = sd_bus_message_ref(message);
439 q->request_family = family;
440 memcpy(&q->request_address, d, sz);
441 q->complete = bus_method_resolve_address_complete;
452 static const sd_bus_vtable resolve_vtable[] = {
453 SD_BUS_VTABLE_START(0),
454 SD_BUS_METHOD("ResolveHostname", "sy", "a(yayi)s", bus_method_resolve_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
455 SD_BUS_METHOD("ResolveAddress", "yayi", "as", bus_method_resolve_address, SD_BUS_VTABLE_UNPRIVILEGED),
459 static int on_bus_retry(sd_event_source *s, usec_t usec, void *userdata) {
460 Manager *m = userdata;
465 m->bus_retry_event_source = sd_event_source_unref(m->bus_retry_event_source);
467 manager_connect_bus(m);
471 int manager_connect_bus(Manager *m) {
479 r = sd_bus_default_system(&m->bus);
481 /* We failed to connect? Yuck, we must be in early
482 * boot. Let's try in 5s again. As soon as we have
483 * kdbus we can stop doing this... */
485 log_debug("Failed to connect to bus, trying again in 5s: %s", strerror(-r));
487 r = sd_event_add_time(m->event, &m->bus_retry_event_source, CLOCK_MONOTONIC, now(CLOCK_MONOTONIC) + 5*USEC_PER_SEC, 0, on_bus_retry, m);
489 log_error("Failed to install bus reconnect time event: %s", strerror(-r));
496 r = sd_bus_add_object_vtable(m->bus, NULL, "/org/freedesktop/resolve1", "org.freedesktop.resolve1.Manager", resolve_vtable, m);
498 log_error("Failed to register object: %s", strerror(-r));
502 r = sd_bus_request_name(m->bus, "org.freedesktop.resolve1", 0);
504 log_error("Failed to register name: %s", strerror(-r));
508 r = sd_bus_attach_event(m->bus, m->event, 0);
510 log_error("Failed to attach bus to event loop: %s", strerror(-r));