xref: /openbmc/qemu/io/net-listener.c (revision 0c4a94b8) 
1 /*
2  * QEMU network listener
3  *
4  * Copyright (c) 2016-2017 Red Hat, Inc.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program 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
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License along
17  * with this program; if not, see <http://www.gnu.org/licenses/>.
18  *
19  */
20 
21 #include "qemu/osdep.h"
22 #include "io/net-listener.h"
23 #include "io/dns-resolver.h"
24 #include "qapi/error.h"
25 
26 QIONetListener *qio_net_listener_new(void)
27 {
28     QIONetListener *ret;
29 
30     ret = QIO_NET_LISTENER(object_new(TYPE_QIO_NET_LISTENER));
31 
32     return ret;
33 }
34 
35 void qio_net_listener_set_name(QIONetListener *listener,
36                                const char *name)
37 {
38     g_free(listener->name);
39     listener->name = g_strdup(name);
40 }
41 
42 
43 static gboolean qio_net_listener_channel_func(QIOChannel *ioc,
44                                               GIOCondition condition,
45                                               gpointer opaque)
46 {
47     QIONetListener *listener = QIO_NET_LISTENER(opaque);
48     QIOChannelSocket *sioc;
49 
50     sioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc),
51                                      NULL);
52     if (!sioc) {
53         return TRUE;
54     }
55 
56     if (listener->io_func) {
57         listener->io_func(listener, sioc, listener->io_data);
58     }
59 
60     object_unref(OBJECT(sioc));
61 
62     return TRUE;
63 }
64 
65 
66 int qio_net_listener_open_sync(QIONetListener *listener,
67                                SocketAddress *addr,
68                                Error **errp)
69 {
70     QIODNSResolver *resolver = qio_dns_resolver_get_instance();
71     SocketAddress **resaddrs;
72     size_t nresaddrs;
73     size_t i;
74     Error *err = NULL;
75     bool success = false;
76 
77     if (qio_dns_resolver_lookup_sync(resolver,
78                                      addr,
79                                      &nresaddrs,
80                                      &resaddrs,
81                                      errp) < 0) {
82         return -1;
83     }
84 
85     for (i = 0; i < nresaddrs; i++) {
86         QIOChannelSocket *sioc = qio_channel_socket_new();
87 
88         if (qio_channel_socket_listen_sync(sioc, resaddrs[i],
89                                            err ? NULL : &err) == 0) {
90             success = true;
91 
92             qio_net_listener_add(listener, sioc);
93         }
94 
95         qapi_free_SocketAddress(resaddrs[i]);
96         object_unref(OBJECT(sioc));
97     }
98     g_free(resaddrs);
99 
100     if (success) {
101         error_free(err);
102         return 0;
103     } else {
104         error_propagate(errp, err);
105         return -1;
106     }
107 }
108 
109 
110 void qio_net_listener_add(QIONetListener *listener,
111                           QIOChannelSocket *sioc)
112 {
113     if (listener->name) {
114         char *name = g_strdup_printf("%s-listen", listener->name);
115         qio_channel_set_name(QIO_CHANNEL(sioc), name);
116         g_free(name);
117     }
118 
119     listener->sioc = g_renew(QIOChannelSocket *, listener->sioc,
120                              listener->nsioc + 1);
121     listener->io_tag = g_renew(gulong, listener->io_tag, listener->nsioc + 1);
122     listener->sioc[listener->nsioc] = sioc;
123     listener->io_tag[listener->nsioc] = 0;
124 
125     object_ref(OBJECT(sioc));
126     listener->connected = true;
127 
128     if (listener->io_func != NULL) {
129         object_ref(OBJECT(listener));
130         listener->io_tag[listener->nsioc] = qio_channel_add_watch(
131             QIO_CHANNEL(listener->sioc[listener->nsioc]), G_IO_IN,
132             qio_net_listener_channel_func,
133             listener, (GDestroyNotify)object_unref);
134     }
135 
136     listener->nsioc++;
137 }
138 
139 
140 void qio_net_listener_set_client_func(QIONetListener *listener,
141                                       QIONetListenerClientFunc func,
142                                       gpointer data,
143                                       GDestroyNotify notify)
144 {
145     size_t i;
146 
147     if (listener->io_notify) {
148         listener->io_notify(listener->io_data);
149     }
150     listener->io_func = func;
151     listener->io_data = data;
152     listener->io_notify = notify;
153 
154     for (i = 0; i < listener->nsioc; i++) {
155         if (listener->io_tag[i]) {
156             g_source_remove(listener->io_tag[i]);
157             listener->io_tag[i] = 0;
158         }
159     }
160 
161     if (listener->io_func != NULL) {
162         for (i = 0; i < listener->nsioc; i++) {
163             object_ref(OBJECT(listener));
164             listener->io_tag[i] = qio_channel_add_watch(
165                 QIO_CHANNEL(listener->sioc[i]), G_IO_IN,
166                 qio_net_listener_channel_func,
167                 listener, (GDestroyNotify)object_unref);
168         }
169     }
170 }
171 
172 
173 struct QIONetListenerClientWaitData {
174     QIOChannelSocket *sioc;
175     GMainLoop *loop;
176 };
177 
178 
179 static gboolean qio_net_listener_wait_client_func(QIOChannel *ioc,
180                                                   GIOCondition condition,
181                                                   gpointer opaque)
182 {
183     struct QIONetListenerClientWaitData *data = opaque;
184     QIOChannelSocket *sioc;
185 
186     sioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc),
187                                      NULL);
188     if (!sioc) {
189         return TRUE;
190     }
191 
192     if (data->sioc) {
193         object_unref(OBJECT(sioc));
194     } else {
195         data->sioc = sioc;
196         g_main_loop_quit(data->loop);
197     }
198 
199     return TRUE;
200 }
201 
202 QIOChannelSocket *qio_net_listener_wait_client(QIONetListener *listener)
203 {
204     GMainContext *ctxt = g_main_context_new();
205     GMainLoop *loop = g_main_loop_new(ctxt, TRUE);
206     GSource **sources;
207     struct QIONetListenerClientWaitData data = {
208         .sioc = NULL,
209         .loop = loop
210     };
211     size_t i;
212 
213     for (i = 0; i < listener->nsioc; i++) {
214         if (listener->io_tag[i]) {
215             g_source_remove(listener->io_tag[i]);
216             listener->io_tag[i] = 0;
217         }
218     }
219 
220     sources = g_new0(GSource *, listener->nsioc);
221     for (i = 0; i < listener->nsioc; i++) {
222         sources[i] = qio_channel_create_watch(QIO_CHANNEL(listener->sioc[i]),
223                                               G_IO_IN);
224 
225         g_source_set_callback(sources[i],
226                               (GSourceFunc)qio_net_listener_wait_client_func,
227                               &data,
228                               NULL);
229         g_source_attach(sources[i], ctxt);
230     }
231 
232     g_main_loop_run(loop);
233 
234     for (i = 0; i < listener->nsioc; i++) {
235         g_source_unref(sources[i]);
236     }
237     g_free(sources);
238     g_main_loop_unref(loop);
239     g_main_context_unref(ctxt);
240 
241     if (listener->io_func != NULL) {
242         for (i = 0; i < listener->nsioc; i++) {
243             object_ref(OBJECT(listener));
244             listener->io_tag[i] = qio_channel_add_watch(
245                 QIO_CHANNEL(listener->sioc[i]), G_IO_IN,
246                 qio_net_listener_channel_func,
247                 listener, (GDestroyNotify)object_unref);
248         }
249     }
250 
251     return data.sioc;
252 }
253 
254 void qio_net_listener_disconnect(QIONetListener *listener)
255 {
256     size_t i;
257 
258     if (!listener->connected) {
259         return;
260     }
261 
262     for (i = 0; i < listener->nsioc; i++) {
263         if (listener->io_tag[i]) {
264             g_source_remove(listener->io_tag[i]);
265             listener->io_tag[i] = 0;
266         }
267         qio_channel_close(QIO_CHANNEL(listener->sioc[i]), NULL);
268     }
269     listener->connected = false;
270 }
271 
272 
273 bool qio_net_listener_is_connected(QIONetListener *listener)
274 {
275     return listener->connected;
276 }
277 
278 static void qio_net_listener_finalize(Object *obj)
279 {
280     QIONetListener *listener = QIO_NET_LISTENER(obj);
281     size_t i;
282 
283     qio_net_listener_disconnect(listener);
284 
285     for (i = 0; i < listener->nsioc; i++) {
286         object_unref(OBJECT(listener->sioc[i]));
287     }
288     g_free(listener->io_tag);
289     g_free(listener->sioc);
290     g_free(listener->name);
291 }
292 
293 static const TypeInfo qio_net_listener_info = {
294     .parent = TYPE_OBJECT,
295     .name = TYPE_QIO_NET_LISTENER,
296     .instance_size = sizeof(QIONetListener),
297     .instance_finalize = qio_net_listener_finalize,
298     .class_size = sizeof(QIONetListenerClass),
299 };
300 
301 
302 static void qio_net_listener_register_types(void)
303 {
304     type_register_static(&qio_net_listener_info);
305 }
306 
307 
308 type_init(qio_net_listener_register_types);
309