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);
238 r = sd_bus_message_close_container(reply);
242 /* Return the precise spelling and uppercasing reported by the server */
244 r = sd_bus_message_append(reply, "s", DNS_RESOURCE_KEY_NAME(canonical->key));
248 r = sd_bus_send(q->manager->bus, reply, NULL);
252 log_error("Failed to send hostname reply: %s", strerror(-r));
253 sd_bus_reply_method_errno(q->request, -r, NULL);
259 static int bus_method_resolve_hostname(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
260 _cleanup_(dns_question_unrefp) DnsQuestion *question = NULL;
261 Manager *m = userdata;
262 const char *hostname;
271 r = sd_bus_message_read(message, "si", &hostname, &family);
275 if (!IN_SET(family, AF_INET, AF_INET6, AF_UNSPEC))
276 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unknown address family %i", family);
278 if (!hostname_is_valid(hostname))
279 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid hostname '%s'", hostname);
281 question = dns_question_new(family == AF_UNSPEC ? 2 : 1);
285 if (family != AF_INET6) {
286 _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
288 key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_A, hostname);
292 r = dns_question_add(question, key);
297 if (family != AF_INET) {
298 _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
300 key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_AAAA, hostname);
304 r = dns_question_add(question, key);
309 r = dns_query_new(m, &q, question);
313 q->request = sd_bus_message_ref(message);
314 q->request_family = family;
315 q->request_hostname = hostname;
316 q->complete = bus_method_resolve_hostname_complete;
323 sd_bus_error_setf(error, BUS_ERROR_NO_NAME_SERVERS, "No appropriate name servers or networks for name found");
331 static void bus_method_resolve_address_complete(DnsQuery *q) {
332 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
333 _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL;
334 unsigned added = 0, i;
339 if (q->state != DNS_QUERY_SUCCESS) {
340 r = reply_query_state(q);
344 r = sd_bus_message_new_method_return(q->request, &reply);
348 r = sd_bus_message_open_container(reply, 'a', "s");
353 answer = dns_answer_ref(q->answer);
355 for (i = 0; i < answer->n_rrs; i++) {
356 r = dns_question_matches_rr(q->question, answer->rrs[i]);
362 r = sd_bus_message_append(reply, "s", answer->rrs[i]->ptr.name);
371 _cleanup_free_ char *ip = NULL;
373 in_addr_to_string(q->request_family, &q->request_address, &ip);
375 r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "Address '%s' does not have any RR of requested type", ip);
379 r = sd_bus_message_close_container(reply);
383 r = sd_bus_send(q->manager->bus, reply, NULL);
387 log_error("Failed to send address reply: %s", strerror(-r));
388 sd_bus_reply_method_errno(q->request, -r, NULL);
394 static int bus_method_resolve_address(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
395 _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
396 _cleanup_(dns_question_unrefp) DnsQuestion *question = NULL;
397 _cleanup_free_ char *reverse = NULL;
398 Manager *m = userdata;
409 r = sd_bus_message_read(message, "i", &family);
413 if (!IN_SET(family, AF_INET, AF_INET6))
414 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unknown address family %i", family);
416 r = sd_bus_message_read_array(message, 'y', &d, &sz);
420 if (sz != FAMILY_ADDRESS_SIZE(family))
421 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid address size");
423 r = sd_bus_message_read(message, "i", &ifindex);
427 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid interface index");
429 r = dns_name_reverse(family, d, &reverse);
433 question = dns_question_new(1);
437 key = dns_resource_key_new_consume(DNS_CLASS_IN, DNS_TYPE_PTR, reverse);
443 r = dns_question_add(question, key);
447 r = dns_query_new(m, &q, question);
451 q->request = sd_bus_message_ref(message);
452 q->request_family = family;
453 memcpy(&q->request_address, d, sz);
454 q->complete = bus_method_resolve_address_complete;
461 sd_bus_error_setf(error, BUS_ERROR_NO_NAME_SERVERS, "No appropriate name servers or networks for name found");
469 static void bus_method_resolve_record_complete(DnsQuery *q) {
470 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
471 _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL;
472 unsigned added = 0, i;
477 if (q->state != DNS_QUERY_SUCCESS) {
478 r = reply_query_state(q);
482 r = sd_bus_message_new_method_return(q->request, &reply);
486 r = sd_bus_message_open_container(reply, 'a', "(qqay)");
491 answer = dns_answer_ref(q->answer);
493 for (i = 0; i < answer->n_rrs; i++) {
494 _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
497 r = dns_question_matches_rr(q->question, answer->rrs[i]);
503 r = dns_packet_new(&p, DNS_PROTOCOL_DNS, 0);
507 r = dns_packet_append_rr(p, answer->rrs[i], &start);
511 r = sd_bus_message_open_container(reply, 'r', "qqay");
515 r = sd_bus_message_append(reply, "qq", answer->rrs[i]->key->class, answer->rrs[i]->key->type);
519 r = sd_bus_message_append_array(reply, 'y', DNS_PACKET_DATA(p) + start, p->size - start);
523 r = sd_bus_message_close_container(reply);
532 r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "Name '%s' does not have any RR of the requested type", q->request_hostname);
536 r = sd_bus_message_close_container(reply);
540 r = sd_bus_send(q->manager->bus, reply, NULL);
544 log_error("Failed to send record reply: %s", strerror(-r));
545 sd_bus_reply_method_errno(q->request, -r, NULL);
551 static int bus_method_resolve_record(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
552 _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
553 _cleanup_(dns_question_unrefp) DnsQuestion *question = NULL;
554 _cleanup_free_ char *reverse = NULL;
555 Manager *m = userdata;
558 uint16_t class, type;
565 r = sd_bus_message_read(message, "sqq", &name, &class, &type);
569 question = dns_question_new(1);
573 key = dns_resource_key_new(class, type, name);
577 r = dns_question_add(question, key);
581 r = dns_query_new(m, &q, question);
585 q->request = sd_bus_message_ref(message);
586 q->request_hostname = name;
587 q->complete = bus_method_resolve_record_complete;
594 sd_bus_error_setf(error, BUS_ERROR_NO_NAME_SERVERS, "No appropriate name servers or networks for name found");
602 static const sd_bus_vtable resolve_vtable[] = {
603 SD_BUS_VTABLE_START(0),
604 SD_BUS_METHOD("ResolveHostname", "si", "a(iayi)s", bus_method_resolve_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
605 SD_BUS_METHOD("ResolveAddress", "iayi", "as", bus_method_resolve_address, SD_BUS_VTABLE_UNPRIVILEGED),
606 SD_BUS_METHOD("ResolveRecord", "sqq", "a(qqay)", bus_method_resolve_record, SD_BUS_VTABLE_UNPRIVILEGED),
610 static int on_bus_retry(sd_event_source *s, usec_t usec, void *userdata) {
611 Manager *m = userdata;
616 m->bus_retry_event_source = sd_event_source_unref(m->bus_retry_event_source);
618 manager_connect_bus(m);
622 int manager_connect_bus(Manager *m) {
630 r = sd_bus_default_system(&m->bus);
632 /* We failed to connect? Yuck, we must be in early
633 * boot. Let's try in 5s again. As soon as we have
634 * kdbus we can stop doing this... */
636 log_debug("Failed to connect to bus, trying again in 5s: %s", strerror(-r));
638 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);
640 log_error("Failed to install bus reconnect time event: %s", strerror(-r));
647 r = sd_bus_add_object_vtable(m->bus, NULL, "/org/freedesktop/resolve1", "org.freedesktop.resolve1.Manager", resolve_vtable, m);
649 log_error("Failed to register object: %s", strerror(-r));
653 r = sd_bus_request_name(m->bus, "org.freedesktop.resolve1", 0);
655 log_error("Failed to register name: %s", strerror(-r));
659 r = sd_bus_attach_event(m->bus, m->event, 0);
661 log_error("Failed to attach bus to event loop: %s", strerror(-r));