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;
65 if (DNS_PACKET_RCODE(q->received) == DNS_RCODE_NXDOMAIN)
66 sd_bus_error_setf(&error, _BUS_ERROR_DNS "NXDOMAIN", "'%s' not found", name);
69 char p[3]; /* the rcode is 4 bits long */
71 rc = dns_rcode_to_string(DNS_PACKET_RCODE(q->received));
73 sprintf(p, "%i", DNS_PACKET_RCODE(q->received));
77 n = strappenda(_BUS_ERROR_DNS, rc);
78 sd_bus_error_setf(&error, n, "Could not resolve '%s', server or network returned error %s", name, rc);
81 return sd_bus_reply_method_error(q->request, &error);
85 case DNS_QUERY_PENDING:
86 case DNS_QUERY_SUCCESS:
88 assert_not_reached("Impossible state");
92 static int append_address(sd_bus_message *reply, DnsResourceRecord *rr, int ifindex) {
98 r = sd_bus_message_open_container(reply, 'r', "yayi");
102 if (rr->key.type == DNS_TYPE_A) {
103 r = sd_bus_message_append(reply, "y", AF_INET);
107 r = sd_bus_message_append_array(reply, 'y', &rr->a.in_addr, sizeof(struct in_addr));
109 r = sd_bus_message_append(reply, "y", AF_INET6);
113 r = sd_bus_message_append_array(reply, 'y', &rr->aaaa.in6_addr, sizeof(struct in6_addr));
118 r = sd_bus_message_append(reply, "i", ifindex);
122 r = sd_bus_message_close_container(reply);
129 static void bus_method_resolve_hostname_complete(DnsQuery *q) {
130 _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *cname = NULL, *canonical = NULL;
131 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
132 unsigned i, n, added = 0;
133 size_t answer_rindex;
138 if (q->state != DNS_QUERY_SUCCESS) {
139 r = reply_query_state(q);
145 r = dns_packet_skip_question(q->received);
149 answer_rindex = q->received->rindex;
151 r = sd_bus_message_new_method_return(q->request, &reply);
155 r = sd_bus_message_open_container(reply, 'a', "(yayi)");
159 n = DNS_PACKET_ANCOUNT(q->received) +
160 DNS_PACKET_NSCOUNT(q->received) +
161 DNS_PACKET_ARCOUNT(q->received);
163 for (i = 0; i < n; i++) {
164 _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
166 r = dns_packet_read_rr(q->received, &rr, NULL);
170 r = dns_query_matches_rr(q, rr);
174 /* Hmm, if this is not an address record,
175 maybe it's a cname? If so, remember this */
176 r = dns_query_matches_cname(q, rr);
180 cname = dns_resource_record_ref(rr);
185 r = append_address(reply, rr, q->received->ifindex);
190 canonical = dns_resource_record_ref(rr);
197 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);
201 /* This has a cname? Then update the query with the
203 r = dns_query_follow_cname(q, cname->cname.name);
206 r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_CNAME_LOOP, "CNAME loop on '%s'", q->request_hostname);
208 r = sd_bus_reply_method_errno(q->request, -r, NULL);
213 /* Before we restart the query, let's see if any of
214 * the RRs we already got already answers our query */
215 dns_packet_rewind(q->received, answer_rindex);
216 for (i = 0; i < n; i++) {
217 _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
219 r = dns_packet_read_rr(q->received, &rr, NULL);
223 r = dns_query_matches_rr(q, rr);
229 r = append_address(reply, rr, q->received->ifindex);
234 canonical = dns_resource_record_ref(rr);
239 /* If we didn't find anything, then let's restart the
240 * query, this time with the cname */
242 r = dns_query_start(q);
244 r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_NAME_SERVERS, "No appropriate name servers or networks for name found");
248 r = sd_bus_reply_method_errno(q->request, -r, NULL);
255 r = sd_bus_message_close_container(reply);
259 /* Return the precise spelling and uppercasing reported by the server */
261 r = sd_bus_message_append(reply, "s", canonical->key.name);
265 r = sd_bus_send(q->manager->bus, reply, NULL);
269 r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_INVALID_REPLY, "Received invalid reply");
273 log_error("Failed to send bus reply: %s", strerror(-r));
278 static int bus_method_resolve_hostname(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
279 Manager *m = userdata;
280 const char *hostname;
282 DnsResourceKey keys[2];
291 r = sd_bus_message_read(message, "sy", &hostname, &family);
295 if (!IN_SET(family, AF_INET, AF_INET6, AF_UNSPEC))
296 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unknown address family %u", family);
298 if (!hostname_is_valid(hostname))
299 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid hostname '%s'", hostname);
301 if (family != AF_INET6) {
302 keys[n].class = DNS_CLASS_IN;
303 keys[n].type = DNS_TYPE_A;
304 keys[n].name = (char*) hostname;
308 if (family != AF_INET) {
309 keys[n].class = DNS_CLASS_IN;
310 keys[n].type = DNS_TYPE_AAAA;
311 keys[n].name = (char*) hostname;
315 r = dns_query_new(m, &q, keys, n);
319 q->request = sd_bus_message_ref(message);
320 q->request_family = family;
321 q->request_hostname = hostname;
322 q->complete = bus_method_resolve_hostname_complete;
324 r = dns_query_start(q);
329 sd_bus_error_setf(error, BUS_ERROR_NO_NAME_SERVERS, "No appropriate name servers or networks for name found");
337 static void bus_method_resolve_address_complete(DnsQuery *q) {
338 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
339 unsigned i, n, added = 0;
344 if (q->state != DNS_QUERY_SUCCESS) {
345 r = reply_query_state(q);
351 r = dns_packet_skip_question(q->received);
355 r = sd_bus_message_new_method_return(q->request, &reply);
359 r = sd_bus_message_open_container(reply, 'a', "s");
363 n = DNS_PACKET_ANCOUNT(q->received) +
364 DNS_PACKET_NSCOUNT(q->received) +
365 DNS_PACKET_ARCOUNT(q->received);
367 for (i = 0; i < n; i++) {
368 _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
370 r = dns_packet_read_rr(q->received, &rr, NULL);
374 r = dns_query_matches_rr(q, rr);
380 r = sd_bus_message_append(reply, "s", rr->ptr.name);
388 _cleanup_free_ char *ip = NULL;
390 in_addr_to_string(q->request_family, &q->request_address, &ip);
392 r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "Address '%s' does not have any RR of requested type", ip);
396 r = sd_bus_message_close_container(reply);
400 r = sd_bus_send(q->manager->bus, reply, NULL);
404 r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_INVALID_REPLY, "Received invalid reply");
408 log_error("Failed to send bus reply: %s", strerror(-r));
413 static int bus_method_resolve_address(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
414 _cleanup_(dns_resource_key_free) DnsResourceKey key = {};
415 Manager *m = userdata;
427 r = sd_bus_message_read(message, "y", &family);
431 if (!IN_SET(family, AF_INET, AF_INET6))
432 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unknown address family %u", family);
434 r = sd_bus_message_read_array(message, 'y', &d, &sz);
438 if ((family == AF_INET && sz != sizeof(struct in_addr)) ||
439 (family == AF_INET6 && sz != sizeof(struct in6_addr)))
440 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid address size");
442 r = sd_bus_message_read(message, "i", &ifindex);
446 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid interface index");
448 key.class = DNS_CLASS_IN;
449 key.type = DNS_TYPE_PTR;
450 r = dns_name_reverse(family, d, &key.name);
454 r = dns_query_new(m, &q, &key, 1);
458 q->request = sd_bus_message_ref(message);
459 q->request_family = family;
460 memcpy(&q->request_address, d, sz);
461 q->complete = bus_method_resolve_address_complete;
463 r = dns_query_start(q);
472 static const sd_bus_vtable resolve_vtable[] = {
473 SD_BUS_VTABLE_START(0),
474 SD_BUS_METHOD("ResolveHostname", "sy", "a(yayi)s", bus_method_resolve_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
475 SD_BUS_METHOD("ResolveAddress", "yayi", "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));