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;
63 if (q->answer_rcode == DNS_RCODE_NXDOMAIN)
64 sd_bus_error_setf(&error, _BUS_ERROR_DNS "NXDOMAIN", "'%s' not found", name);
67 char p[3]; /* the rcode is 4 bits long */
69 rc = dns_rcode_to_string(q->answer_rcode);
71 sprintf(p, "%i", q->answer_rcode);
75 n = strappenda(_BUS_ERROR_DNS, rc);
76 sd_bus_error_setf(&error, n, "Could not resolve '%s', server or network returned error %s", name, rc);
79 return sd_bus_reply_method_error(q->request, &error);
83 case DNS_QUERY_PENDING:
84 case DNS_QUERY_SUCCESS:
86 assert_not_reached("Impossible state");
90 static int append_address(sd_bus_message *reply, DnsResourceRecord *rr, int ifindex) {
96 r = sd_bus_message_open_container(reply, 'r', "iayi");
100 if (rr->key->type == DNS_TYPE_A) {
101 r = sd_bus_message_append(reply, "i", AF_INET);
105 r = sd_bus_message_append_array(reply, 'y', &rr->a.in_addr, sizeof(struct in_addr));
107 } else if (rr->key->type == DNS_TYPE_AAAA) {
108 r = sd_bus_message_append(reply, "i", AF_INET6);
112 r = sd_bus_message_append_array(reply, 'y', &rr->aaaa.in6_addr, sizeof(struct in6_addr));
114 return -EAFNOSUPPORT;
119 r = sd_bus_message_append(reply, "i", ifindex);
123 r = sd_bus_message_close_container(reply);
130 static void bus_method_resolve_hostname_complete(DnsQuery *q) {
131 _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *cname = NULL, *canonical = NULL;
132 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
133 _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL;
134 unsigned added = 0, i;
139 if (q->state != DNS_QUERY_SUCCESS) {
140 r = reply_query_state(q);
144 r = sd_bus_message_new_method_return(q->request, &reply);
148 r = sd_bus_message_open_container(reply, 'a', "(iayi)");
152 ifindex = q->answer_ifindex;
155 answer = dns_answer_ref(q->answer);
157 for (i = 0; i < answer->n_rrs; i++) {
158 r = dns_question_matches_rr(q->question, answer->rrs[i]);
162 /* Hmm, if this is not an address record,
163 maybe it's a cname? If so, remember this */
164 r = dns_question_matches_cname(q->question, answer->rrs[i]);
168 cname = dns_resource_record_ref(answer->rrs[i]);
173 r = append_address(reply, answer->rrs[i], ifindex);
178 canonical = dns_resource_record_ref(answer->rrs[i]);
186 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);
190 /* This has a cname? Then update the query with the
192 r = dns_query_cname_redirect(q, cname->cname.name);
195 r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_CNAME_LOOP, "CNAME loop on '%s'", q->request_hostname);
197 r = sd_bus_reply_method_errno(q->request, -r, NULL);
202 /* Before we restart the query, let's see if any of
203 * the RRs we already got already answers our query */
204 for (i = 0; i < answer->n_rrs; i++) {
205 r = dns_question_matches_rr(q->question, answer->rrs[i]);
211 r = append_address(reply, answer->rrs[i], ifindex);
216 canonical = dns_resource_record_ref(answer->rrs[i]);
221 /* If we didn't find anything, then let's restart the
222 * query, this time with the cname */
226 r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_NAME_SERVERS, "No appropriate name servers or networks for name found");
230 r = sd_bus_reply_method_errno(q->request, -r, NULL);
237 r = sd_bus_message_close_container(reply);
241 /* Return the precise spelling and uppercasing reported by the server */
243 r = sd_bus_message_append(reply, "s", DNS_RESOURCE_KEY_NAME(canonical->key));
247 r = sd_bus_send(q->manager->bus, reply, NULL);
251 r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_INVALID_REPLY, "Received invalid reply");
255 log_error("Failed to send bus reply: %s", strerror(-r));
260 static int bus_method_resolve_hostname(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
261 _cleanup_(dns_question_unrefp) DnsQuestion *question = NULL;
262 Manager *m = userdata;
263 const char *hostname;
272 r = sd_bus_message_read(message, "si", &hostname, &family);
276 if (!IN_SET(family, AF_INET, AF_INET6, AF_UNSPEC))
277 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unknown address family %i", family);
279 if (!hostname_is_valid(hostname))
280 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid hostname '%s'", hostname);
282 question = dns_question_new(family == AF_UNSPEC ? 2 : 1);
286 if (family != AF_INET6) {
287 _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
289 key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_A, hostname);
293 r = dns_question_add(question, key);
298 if (family != AF_INET) {
299 _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
301 key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_AAAA, hostname);
305 r = dns_question_add(question, key);
310 r = dns_query_new(m, &q, question);
314 q->request = sd_bus_message_ref(message);
315 q->request_family = family;
316 q->request_hostname = hostname;
317 q->complete = bus_method_resolve_hostname_complete;
324 sd_bus_error_setf(error, BUS_ERROR_NO_NAME_SERVERS, "No appropriate name servers or networks for name found");
332 static void bus_method_resolve_address_complete(DnsQuery *q) {
333 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
334 _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL;
335 unsigned added = 0, i;
340 if (q->state != DNS_QUERY_SUCCESS) {
341 r = reply_query_state(q);
345 r = sd_bus_message_new_method_return(q->request, &reply);
349 r = sd_bus_message_open_container(reply, 'a', "s");
354 answer = dns_answer_ref(q->answer);
356 for (i = 0; i < answer->n_rrs; i++) {
357 r = dns_question_matches_rr(q->question, answer->rrs[i]);
363 r = sd_bus_message_append(reply, "s", answer->rrs[i]->ptr.name);
372 _cleanup_free_ char *ip = NULL;
374 in_addr_to_string(q->request_family, &q->request_address, &ip);
376 r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "Address '%s' does not have any RR of requested type", ip);
380 r = sd_bus_message_close_container(reply);
384 r = sd_bus_send(q->manager->bus, reply, NULL);
388 r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_INVALID_REPLY, "Received invalid reply");
392 log_error("Failed to send bus reply: %s", strerror(-r));
397 static int bus_method_resolve_address(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
398 _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
399 _cleanup_(dns_question_unrefp) DnsQuestion *question = NULL;
400 _cleanup_free_ char *reverse = NULL;
401 Manager *m = userdata;
412 r = sd_bus_message_read(message, "i", &family);
416 if (!IN_SET(family, AF_INET, AF_INET6))
417 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unknown address family %i", family);
419 r = sd_bus_message_read_array(message, 'y', &d, &sz);
423 if (sz != FAMILY_ADDRESS_SIZE(family))
424 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid address size");
426 r = sd_bus_message_read(message, "i", &ifindex);
430 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid interface index");
432 r = dns_name_reverse(family, d, &reverse);
436 question = dns_question_new(1);
440 key = dns_resource_key_new_consume(DNS_CLASS_IN, DNS_TYPE_PTR, reverse);
446 r = dns_question_add(question, key);
450 r = dns_query_new(m, &q, question);
454 q->request = sd_bus_message_ref(message);
455 q->request_family = family;
456 memcpy(&q->request_address, d, sz);
457 q->complete = bus_method_resolve_address_complete;
464 sd_bus_error_setf(error, BUS_ERROR_NO_NAME_SERVERS, "No appropriate name servers or networks for name found");
472 static const sd_bus_vtable resolve_vtable[] = {
473 SD_BUS_VTABLE_START(0),
474 SD_BUS_METHOD("ResolveHostname", "si", "a(iayi)s", bus_method_resolve_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
475 SD_BUS_METHOD("ResolveAddress", "iayi", "as", bus_method_resolve_address, SD_BUS_VTABLE_UNPRIVILEGED),
479 static int on_bus_retry(sd_event_source *s, usec_t usec, void *userdata) {
480 Manager *m = userdata;
485 m->bus_retry_event_source = sd_event_source_unref(m->bus_retry_event_source);
487 manager_connect_bus(m);
491 int manager_connect_bus(Manager *m) {
499 r = sd_bus_default_system(&m->bus);
501 /* We failed to connect? Yuck, we must be in early
502 * boot. Let's try in 5s again. As soon as we have
503 * kdbus we can stop doing this... */
505 log_debug("Failed to connect to bus, trying again in 5s: %s", strerror(-r));
507 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);
509 log_error("Failed to install bus reconnect time event: %s", strerror(-r));
516 r = sd_bus_add_object_vtable(m->bus, NULL, "/org/freedesktop/resolve1", "org.freedesktop.resolve1.Manager", resolve_vtable, m);
518 log_error("Failed to register object: %s", strerror(-r));
522 r = sd_bus_request_name(m->bus, "org.freedesktop.resolve1", 0);
524 log_error("Failed to register name: %s", strerror(-r));
528 r = sd_bus_attach_event(m->bus, m->event, 0);
530 log_error("Failed to attach bus to event loop: %s", strerror(-r));