io/net-listener.c

   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_main_loop_unref(loop);
 238     g_main_context_unref(ctxt);
 239
 240     if (listener->io_func != NULL) {
 241         for (i = 0; i < listener->nsioc; i++) {
 242             object_ref(OBJECT(listener));
 243             listener->io_tag[i] = qio_channel_add_watch(
 244                 QIO_CHANNEL(listener->sioc[i]), G_IO_IN,
 245                 qio_net_listener_channel_func,
 246                 listener, (GDestroyNotify)object_unref);
 247         }
 248     }
 249
 250     return data.sioc;
 251 }
 252
 253 void qio_net_listener_disconnect(QIONetListener *listener)
 254 {
 255     size_t i;
 256
 257     if (!listener->connected) {
 258         return;
 259     }
 260
 261     for (i = 0; i < listener->nsioc; i++) {
 262         if (listener->io_tag[i]) {
 263             g_source_remove(listener->io_tag[i]);
 264             listener->io_tag[i] = 0;
 265         }
 266         qio_channel_close(QIO_CHANNEL(listener->sioc[i]), NULL);
 267     }
 268     listener->connected = false;
 269 }
 270
 271
 272 bool qio_net_listener_is_connected(QIONetListener *listener)
 273 {
 274     return listener->connected;
 275 }
 276
 277 static void qio_net_listener_finalize(Object *obj)
 278 {
 279     QIONetListener *listener = QIO_NET_LISTENER(obj);
 280     size_t i;
 281
 282     qio_net_listener_disconnect(listener);
 283
 284     for (i = 0; i < listener->nsioc; i++) {
 285         object_unref(OBJECT(listener->sioc[i]));
 286     }
 287     g_free(listener->io_tag);
 288     g_free(listener->sioc);
 289     g_free(listener->name);
 290 }
 291
 292 static const TypeInfo qio_net_listener_info = {
 293     .parent = TYPE_OBJECT,
 294     .name = TYPE_QIO_NET_LISTENER,
 295     .instance_size = sizeof(QIONetListener),
 296     .instance_finalize = qio_net_listener_finalize,
 297     .class_size = sizeof(QIONetListenerClass),
 298 };
 299
 300
 301 static void qio_net_listener_register_types(void)
 302 {
 303     type_register_static(&qio_net_listener_info);
 304 }
 305
 306
 307 type_init(qio_net_listener_register_types);