Merge tag 'pull-target-arm-20220812' of https://git.linaro.org/people/pmaydell/qemu...
[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 2.1 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 #ifdef HAVE_IPPROTO_MPTCP
126 .has_mptcp = iaddr->has_mptcp,
127 .mptcp = iaddr->mptcp,
128 #endif
129 };
130
131 (*addrs)[i] = newaddr;
132 }
133 freeaddrinfo(res);
134 return 0;
135 }
136
137
138 static int qio_dns_resolver_lookup_sync_nop(QIODNSResolver *resolver,
139 SocketAddress *addr,
140 size_t *naddrs,
141 SocketAddress ***addrs,
142 Error **errp)
143 {
144 *naddrs = 1;
145 *addrs = g_new0(SocketAddress *, 1);
146 (*addrs)[0] = QAPI_CLONE(SocketAddress, addr);
147
148 return 0;
149 }
150
151
152 int qio_dns_resolver_lookup_sync(QIODNSResolver *resolver,
153 SocketAddress *addr,
154 size_t *naddrs,
155 SocketAddress ***addrs,
156 Error **errp)
157 {
158 switch (addr->type) {
159 case SOCKET_ADDRESS_TYPE_INET:
160 return qio_dns_resolver_lookup_sync_inet(resolver,
161 addr,
162 naddrs,
163 addrs,
164 errp);
165
166 case SOCKET_ADDRESS_TYPE_UNIX:
167 case SOCKET_ADDRESS_TYPE_VSOCK:
168 case SOCKET_ADDRESS_TYPE_FD:
169 return qio_dns_resolver_lookup_sync_nop(resolver,
170 addr,
171 naddrs,
172 addrs,
173 errp);
174
175 default:
176 abort();
177 }
178 }
179
180
181 struct QIODNSResolverLookupData {
182 SocketAddress *addr;
183 SocketAddress **addrs;
184 size_t naddrs;
185 };
186
187
188 static void qio_dns_resolver_lookup_data_free(gpointer opaque)
189 {
190 struct QIODNSResolverLookupData *data = opaque;
191 size_t i;
192
193 qapi_free_SocketAddress(data->addr);
194 for (i = 0; i < data->naddrs; i++) {
195 qapi_free_SocketAddress(data->addrs[i]);
196 }
197
198 g_free(data->addrs);
199 g_free(data);
200 }
201
202
203 static void qio_dns_resolver_lookup_worker(QIOTask *task,
204 gpointer opaque)
205 {
206 QIODNSResolver *resolver = QIO_DNS_RESOLVER(qio_task_get_source(task));
207 struct QIODNSResolverLookupData *data = opaque;
208 Error *err = NULL;
209
210 qio_dns_resolver_lookup_sync(resolver,
211 data->addr,
212 &data->naddrs,
213 &data->addrs,
214 &err);
215 if (err) {
216 qio_task_set_error(task, err);
217 } else {
218 qio_task_set_result_pointer(task, opaque, NULL);
219 }
220
221 object_unref(OBJECT(resolver));
222 }
223
224
225 void qio_dns_resolver_lookup_async(QIODNSResolver *resolver,
226 SocketAddress *addr,
227 QIOTaskFunc func,
228 gpointer opaque,
229 GDestroyNotify notify)
230 {
231 QIOTask *task;
232 struct QIODNSResolverLookupData *data =
233 g_new0(struct QIODNSResolverLookupData, 1);
234
235 data->addr = QAPI_CLONE(SocketAddress, addr);
236
237 task = qio_task_new(OBJECT(resolver), func, opaque, notify);
238
239 qio_task_run_in_thread(task,
240 qio_dns_resolver_lookup_worker,
241 data,
242 qio_dns_resolver_lookup_data_free,
243 NULL);
244 }
245
246
247 void qio_dns_resolver_lookup_result(QIODNSResolver *resolver,
248 QIOTask *task,
249 size_t *naddrs,
250 SocketAddress ***addrs)
251 {
252 struct QIODNSResolverLookupData *data =
253 qio_task_get_result_pointer(task);
254 size_t i;
255
256 *naddrs = 0;
257 *addrs = NULL;
258 if (!data) {
259 return;
260 }
261
262 *naddrs = data->naddrs;
263 *addrs = g_new0(SocketAddress *, data->naddrs);
264 for (i = 0; i < data->naddrs; i++) {
265 (*addrs)[i] = QAPI_CLONE(SocketAddress, data->addrs[i]);
266 }
267 }
268
269
270 static const TypeInfo qio_dns_resolver_info = {
271 .parent = TYPE_OBJECT,
272 .name = TYPE_QIO_DNS_RESOLVER,
273 .instance_size = sizeof(QIODNSResolver),
274 };
275
276
277 static void qio_dns_resolver_register_types(void)
278 {
279 type_register_static(&qio_dns_resolver_info);
280 }
281
282
283 type_init(qio_dns_resolver_register_types);