Merge remote-tracking branch 'remotes/dgilbert/tags/pull-migration-20200925a' into...
[qemu.git] / io / dns-resolver.c
1 /*
2 * QEMU DNS resolver
3 *
4 * Copyright (c) 2016 Red Hat, Inc.
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
18 *
19 */
20
21 #include "qemu/osdep.h"
22 #include "io/dns-resolver.h"
23 #include "qapi/clone-visitor.h"
24 #include "qapi/qapi-visit-sockets.h"
25 #include "qemu/sockets.h"
26 #include "qapi/error.h"
27 #include "qemu/cutils.h"
28 #include "qemu/module.h"
29
30 #ifndef AI_NUMERICSERV
31 # define AI_NUMERICSERV 0
32 #endif
33
34 static QIODNSResolver *instance;
35 static GOnce instance_init = G_ONCE_INIT;
36
37 static gpointer qio_dns_resolve_init_instance(gpointer unused G_GNUC_UNUSED)
38 {
39 instance = QIO_DNS_RESOLVER(object_new(TYPE_QIO_DNS_RESOLVER));
40 return NULL;
41 }
42
43 QIODNSResolver *qio_dns_resolver_get_instance(void)
44 {
45 g_once(&instance_init, qio_dns_resolve_init_instance, NULL);
46 return instance;
47 }
48
49 static int qio_dns_resolver_lookup_sync_inet(QIODNSResolver *resolver,
50 SocketAddress *addr,
51 size_t *naddrs,
52 SocketAddress ***addrs,
53 Error **errp)
54 {
55 struct addrinfo ai, *res, *e;
56 InetSocketAddress *iaddr = &addr->u.inet;
57 char port[33];
58 char uaddr[INET6_ADDRSTRLEN + 1];
59 char uport[33];
60 int rc;
61 Error *err = NULL;
62 size_t i;
63
64 *naddrs = 0;
65 *addrs = NULL;
66
67 memset(&ai, 0, sizeof(ai));
68 ai.ai_flags = AI_PASSIVE;
69 if (iaddr->has_numeric && iaddr->numeric) {
70 ai.ai_flags |= AI_NUMERICHOST | AI_NUMERICSERV;
71 }
72 ai.ai_family = inet_ai_family_from_address(iaddr, &err);
73 ai.ai_socktype = SOCK_STREAM;
74
75 if (err) {
76 error_propagate(errp, err);
77 return -1;
78 }
79
80 if (iaddr->host == NULL) {
81 error_setg(errp, "host not specified");
82 return -1;
83 }
84 if (iaddr->port != NULL) {
85 pstrcpy(port, sizeof(port), iaddr->port);
86 } else {
87 port[0] = '\0';
88 }
89
90 rc = getaddrinfo(strlen(iaddr->host) ? iaddr->host : NULL,
91 strlen(port) ? port : NULL, &ai, &res);
92 if (rc != 0) {
93 error_setg(errp, "address resolution failed for %s:%s: %s",
94 iaddr->host, port, gai_strerror(rc));
95 return -1;
96 }
97
98 for (e = res; e != NULL; e = e->ai_next) {
99 (*naddrs)++;
100 }
101
102 *addrs = g_new0(SocketAddress *, *naddrs);
103
104 /* create socket + bind */
105 for (i = 0, e = res; e != NULL; i++, e = e->ai_next) {
106 SocketAddress *newaddr = g_new0(SocketAddress, 1);
107
108 newaddr->type = SOCKET_ADDRESS_TYPE_INET;
109
110 getnameinfo((struct sockaddr *)e->ai_addr, e->ai_addrlen,
111 uaddr, INET6_ADDRSTRLEN, uport, 32,
112 NI_NUMERICHOST | NI_NUMERICSERV);
113
114 newaddr->u.inet = (InetSocketAddress){
115 .host = g_strdup(uaddr),
116 .port = g_strdup(uport),
117 .has_numeric = true,
118 .numeric = true,
119 .has_to = iaddr->has_to,
120 .to = iaddr->to,
121 .has_ipv4 = iaddr->has_ipv4,
122 .ipv4 = iaddr->ipv4,
123 .has_ipv6 = iaddr->has_ipv6,
124 .ipv6 = iaddr->ipv6,
125 };
126
127 (*addrs)[i] = newaddr;
128 }
129 freeaddrinfo(res);
130 return 0;
131 }
132
133
134 static int qio_dns_resolver_lookup_sync_nop(QIODNSResolver *resolver,
135 SocketAddress *addr,
136 size_t *naddrs,
137 SocketAddress ***addrs,
138 Error **errp)
139 {
140 *naddrs = 1;
141 *addrs = g_new0(SocketAddress *, 1);
142 (*addrs)[0] = QAPI_CLONE(SocketAddress, addr);
143
144 return 0;
145 }
146
147
148 int qio_dns_resolver_lookup_sync(QIODNSResolver *resolver,
149 SocketAddress *addr,
150 size_t *naddrs,
151 SocketAddress ***addrs,
152 Error **errp)
153 {
154 switch (addr->type) {
155 case SOCKET_ADDRESS_TYPE_INET:
156 return qio_dns_resolver_lookup_sync_inet(resolver,
157 addr,
158 naddrs,
159 addrs,
160 errp);
161
162 case SOCKET_ADDRESS_TYPE_UNIX:
163 case SOCKET_ADDRESS_TYPE_VSOCK:
164 case SOCKET_ADDRESS_TYPE_FD:
165 return qio_dns_resolver_lookup_sync_nop(resolver,
166 addr,
167 naddrs,
168 addrs,
169 errp);
170
171 default:
172 abort();
173 }
174 }
175
176
177 struct QIODNSResolverLookupData {
178 SocketAddress *addr;
179 SocketAddress **addrs;
180 size_t naddrs;
181 };
182
183
184 static void qio_dns_resolver_lookup_data_free(gpointer opaque)
185 {
186 struct QIODNSResolverLookupData *data = opaque;
187 size_t i;
188
189 qapi_free_SocketAddress(data->addr);
190 for (i = 0; i < data->naddrs; i++) {
191 qapi_free_SocketAddress(data->addrs[i]);
192 }
193
194 g_free(data->addrs);
195 g_free(data);
196 }
197
198
199 static void qio_dns_resolver_lookup_worker(QIOTask *task,
200 gpointer opaque)
201 {
202 QIODNSResolver *resolver = QIO_DNS_RESOLVER(qio_task_get_source(task));
203 struct QIODNSResolverLookupData *data = opaque;
204 Error *err = NULL;
205
206 qio_dns_resolver_lookup_sync(resolver,
207 data->addr,
208 &data->naddrs,
209 &data->addrs,
210 &err);
211 if (err) {
212 qio_task_set_error(task, err);
213 } else {
214 qio_task_set_result_pointer(task, opaque, NULL);
215 }
216
217 object_unref(OBJECT(resolver));
218 }
219
220
221 void qio_dns_resolver_lookup_async(QIODNSResolver *resolver,
222 SocketAddress *addr,
223 QIOTaskFunc func,
224 gpointer opaque,
225 GDestroyNotify notify)
226 {
227 QIOTask *task;
228 struct QIODNSResolverLookupData *data =
229 g_new0(struct QIODNSResolverLookupData, 1);
230
231 data->addr = QAPI_CLONE(SocketAddress, addr);
232
233 task = qio_task_new(OBJECT(resolver), func, opaque, notify);
234
235 qio_task_run_in_thread(task,
236 qio_dns_resolver_lookup_worker,
237 data,
238 qio_dns_resolver_lookup_data_free,
239 NULL);
240 }
241
242
243 void qio_dns_resolver_lookup_result(QIODNSResolver *resolver,
244 QIOTask *task,
245 size_t *naddrs,
246 SocketAddress ***addrs)
247 {
248 struct QIODNSResolverLookupData *data =
249 qio_task_get_result_pointer(task);
250 size_t i;
251
252 *naddrs = 0;
253 *addrs = NULL;
254 if (!data) {
255 return;
256 }
257
258 *naddrs = data->naddrs;
259 *addrs = g_new0(SocketAddress *, data->naddrs);
260 for (i = 0; i < data->naddrs; i++) {
261 (*addrs)[i] = QAPI_CLONE(SocketAddress, data->addrs[i]);
262 }
263 }
264
265
266 static const TypeInfo qio_dns_resolver_info = {
267 .parent = TYPE_OBJECT,
268 .name = TYPE_QIO_DNS_RESOLVER,
269 .instance_size = sizeof(QIODNSResolver),
270 .class_size = sizeof(QIODNSResolverClass),
271 };
272
273
274 static void qio_dns_resolver_register_types(void)
275 {
276 type_register_static(&qio_dns_resolver_info);
277 }
278
279
280 type_init(qio_dns_resolver_register_types);