From 530473924d57fd26ba9779c8702574db4df829d3 Mon Sep 17 00:00:00 2001 From: "Daniel P. Berrange" Date: Tue, 19 Jul 2016 13:37:51 +0100 Subject: io: introduce a network socket listener API The existing QIOChannelSocket class provides the ability to listen on a single socket at a time. This patch introduces a QIONetListener class that provides a higher level API concept around listening for network services, allowing for listening on multiple sockets. Reviewed-by: Eric Blake Signed-off-by: Daniel P. Berrange --- io/Makefile.objs | 1 + io/net-listener.c | 307 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 308 insertions(+) create mode 100644 io/net-listener.c (limited to 'io') diff --git a/io/Makefile.objs b/io/Makefile.objs index 12983cca79..9a20fce4ed 100644 --- a/io/Makefile.objs +++ b/io/Makefile.objs @@ -8,4 +8,5 @@ io-obj-y += channel-watch.o io-obj-y += channel-websock.o io-obj-y += channel-util.o io-obj-y += dns-resolver.o +io-obj-y += net-listener.o io-obj-y += task.o diff --git a/io/net-listener.c b/io/net-listener.c new file mode 100644 index 0000000000..77a4e2831c --- /dev/null +++ b/io/net-listener.c @@ -0,0 +1,307 @@ +/* + * QEMU network listener + * + * Copyright (c) 2016-2017 Red Hat, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, see . + * + */ + +#include "qemu/osdep.h" +#include "io/net-listener.h" +#include "io/dns-resolver.h" +#include "qapi/error.h" + +QIONetListener *qio_net_listener_new(void) +{ + QIONetListener *ret; + + ret = QIO_NET_LISTENER(object_new(TYPE_QIO_NET_LISTENER)); + + return ret; +} + +void qio_net_listener_set_name(QIONetListener *listener, + const char *name) +{ + g_free(listener->name); + listener->name = g_strdup(name); +} + + +static gboolean qio_net_listener_channel_func(QIOChannel *ioc, + GIOCondition condition, + gpointer opaque) +{ + QIONetListener *listener = QIO_NET_LISTENER(opaque); + QIOChannelSocket *sioc; + + sioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc), + NULL); + if (!sioc) { + return TRUE; + } + + if (listener->io_func) { + listener->io_func(listener, sioc, listener->io_data); + } + + object_unref(OBJECT(sioc)); + + return TRUE; +} + + +int qio_net_listener_open_sync(QIONetListener *listener, + SocketAddress *addr, + Error **errp) +{ + QIODNSResolver *resolver = qio_dns_resolver_get_instance(); + SocketAddress **resaddrs; + size_t nresaddrs; + size_t i; + Error *err = NULL; + bool success = false; + + if (qio_dns_resolver_lookup_sync(resolver, + addr, + &nresaddrs, + &resaddrs, + errp) < 0) { + return -1; + } + + for (i = 0; i < nresaddrs; i++) { + QIOChannelSocket *sioc = qio_channel_socket_new(); + + if (qio_channel_socket_listen_sync(sioc, resaddrs[i], + err ? NULL : &err) == 0) { + success = true; + + qio_net_listener_add(listener, sioc); + } + + qapi_free_SocketAddress(resaddrs[i]); + object_unref(OBJECT(sioc)); + } + g_free(resaddrs); + + if (success) { + error_free(err); + return 0; + } else { + error_propagate(errp, err); + return -1; + } +} + + +void qio_net_listener_add(QIONetListener *listener, + QIOChannelSocket *sioc) +{ + if (listener->name) { + char *name = g_strdup_printf("%s-listen", listener->name); + qio_channel_set_name(QIO_CHANNEL(sioc), name); + g_free(name); + } + + listener->sioc = g_renew(QIOChannelSocket *, listener->sioc, + listener->nsioc + 1); + listener->io_tag = g_renew(gulong, listener->io_tag, listener->nsioc + 1); + listener->sioc[listener->nsioc] = sioc; + listener->io_tag[listener->nsioc] = 0; + + object_ref(OBJECT(sioc)); + listener->connected = true; + + if (listener->io_func != NULL) { + object_ref(OBJECT(listener)); + listener->io_tag[listener->nsioc] = qio_channel_add_watch( + QIO_CHANNEL(listener->sioc[listener->nsioc]), G_IO_IN, + qio_net_listener_channel_func, + listener, (GDestroyNotify)object_unref); + } + + listener->nsioc++; +} + + +void qio_net_listener_set_client_func(QIONetListener *listener, + QIONetListenerClientFunc func, + gpointer data, + GDestroyNotify notify) +{ + size_t i; + + if (listener->io_notify) { + listener->io_notify(listener->io_data); + } + listener->io_func = func; + listener->io_data = data; + listener->io_notify = notify; + + for (i = 0; i < listener->nsioc; i++) { + if (listener->io_tag[i]) { + g_source_remove(listener->io_tag[i]); + listener->io_tag[i] = 0; + } + } + + if (listener->io_func != NULL) { + for (i = 0; i < listener->nsioc; i++) { + object_ref(OBJECT(listener)); + listener->io_tag[i] = qio_channel_add_watch( + QIO_CHANNEL(listener->sioc[i]), G_IO_IN, + qio_net_listener_channel_func, + listener, (GDestroyNotify)object_unref); + } + } +} + + +struct QIONetListenerClientWaitData { + QIOChannelSocket *sioc; + GMainLoop *loop; +}; + + +static gboolean qio_net_listener_wait_client_func(QIOChannel *ioc, + GIOCondition condition, + gpointer opaque) +{ + struct QIONetListenerClientWaitData *data = opaque; + QIOChannelSocket *sioc; + + sioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc), + NULL); + if (!sioc) { + return TRUE; + } + + if (data->sioc) { + object_unref(OBJECT(sioc)); + } else { + data->sioc = sioc; + g_main_loop_quit(data->loop); + } + + return TRUE; +} + +QIOChannelSocket *qio_net_listener_wait_client(QIONetListener *listener) +{ + GMainContext *ctxt = g_main_context_new(); + GMainLoop *loop = g_main_loop_new(ctxt, TRUE); + GSource **sources; + struct QIONetListenerClientWaitData data = { + .sioc = NULL, + .loop = loop + }; + size_t i; + + for (i = 0; i < listener->nsioc; i++) { + if (listener->io_tag[i]) { + g_source_remove(listener->io_tag[i]); + listener->io_tag[i] = 0; + } + } + + sources = g_new0(GSource *, listener->nsioc); + for (i = 0; i < listener->nsioc; i++) { + sources[i] = qio_channel_create_watch(QIO_CHANNEL(listener->sioc[i]), + G_IO_IN); + + g_source_set_callback(sources[i], + (GSourceFunc)qio_net_listener_wait_client_func, + &data, + NULL); + g_source_attach(sources[i], ctxt); + } + + g_main_loop_run(loop); + + for (i = 0; i < listener->nsioc; i++) { + g_source_unref(sources[i]); + } + g_main_loop_unref(loop); + g_main_context_unref(ctxt); + + if (listener->io_func != NULL) { + for (i = 0; i < listener->nsioc; i++) { + object_ref(OBJECT(listener)); + listener->io_tag[i] = qio_channel_add_watch( + QIO_CHANNEL(listener->sioc[i]), G_IO_IN, + qio_net_listener_channel_func, + listener, (GDestroyNotify)object_unref); + } + } + + return data.sioc; +} + +void qio_net_listener_disconnect(QIONetListener *listener) +{ + size_t i; + + if (!listener->connected) { + return; + } + + for (i = 0; i < listener->nsioc; i++) { + if (listener->io_tag[i]) { + g_source_remove(listener->io_tag[i]); + listener->io_tag[i] = 0; + } + qio_channel_close(QIO_CHANNEL(listener->sioc[i]), NULL); + } + listener->connected = false; +} + + +bool qio_net_listener_is_connected(QIONetListener *listener) +{ + return listener->connected; +} + +static void qio_net_listener_finalize(Object *obj) +{ + QIONetListener *listener = QIO_NET_LISTENER(obj); + size_t i; + + qio_net_listener_disconnect(listener); + + for (i = 0; i < listener->nsioc; i++) { + object_unref(OBJECT(listener->sioc[i])); + } + g_free(listener->io_tag); + g_free(listener->sioc); + g_free(listener->name); +} + +static const TypeInfo qio_net_listener_info = { + .parent = TYPE_OBJECT, + .name = TYPE_QIO_NET_LISTENER, + .instance_size = sizeof(QIONetListener), + .instance_finalize = qio_net_listener_finalize, + .class_size = sizeof(QIONetListenerClass), +}; + + +static void qio_net_listener_register_types(void) +{ + type_register_static(&qio_net_listener_info); +} + + +type_init(qio_net_listener_register_types); -- cgit v1.2.1