gstreamer/subprojects/gst-plugins-base/gst/tcp/gsttcpelements.c

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) 2020 Huawei Technologies Co., Ltd.
* @Author: Stéphane Cerveau <scerveau@collabora.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gsttcpelements.h"
GST_DEBUG_CATEGORY (tcp_debug);
#define GST_CAT_DEFAULT tcp_debug
void
tcp_element_init (GstPlugin * plugin)
{
static gsize res = FALSE;
if (g_once_init_enter (&res)) {
GST_DEBUG_CATEGORY_INIT (tcp_debug, "tcp", 0, "TCP calls");
g_once_init_leave (&res, TRUE);
}
}
GList *
tcp_get_addresses (GstElement * obj, const char *host,
GCancellable * cancellable, GError ** err)
{
GList *addrs = NULL;
GInetAddress *addr;
g_return_val_if_fail (GST_IS_ELEMENT (obj), NULL);
g_return_val_if_fail (host != NULL, NULL);
g_return_val_if_fail (err == NULL || *err == NULL, NULL);
/* look up name if we need to */
addr = g_inet_address_new_from_string (host);
if (addr) {
addrs = g_list_append (addrs, addr);
} else {
GResolver *resolver = g_resolver_get_default ();
GST_DEBUG_OBJECT (obj, "Looking up IP address(es) for host '%s'", host);
addrs = g_resolver_lookup_by_name (resolver, host, cancellable, err);
g_object_unref (resolver);
}
return addrs;
}
/*
* Loops over available addresses until successfully creates a socket
*
* iter: updated to contain current list position or NULL if finished
* saddr: contains current address is successful
*/
GSocket *
tcp_create_socket (GstElement * obj, GList ** iter, guint16 port,
GSocketAddress ** saddr, GError ** err)
{
GSocket *sock = NULL;
g_return_val_if_fail (GST_IS_ELEMENT (obj), NULL);
g_return_val_if_fail (iter != NULL, NULL);
g_return_val_if_fail (saddr != NULL, NULL);
g_return_val_if_fail (err == NULL || *err == NULL, NULL);
*saddr = NULL;
while (*iter) {
GInetAddress *addr = G_INET_ADDRESS ((*iter)->data);
#ifndef GST_DISABLE_GST_DEBUG
{
gchar *ip = g_inet_address_to_string (addr);
GST_DEBUG_OBJECT (obj, "Trying IP address %s", ip);
g_free (ip);
}
#endif
/* clean up from possible previous iterations */
g_clear_error (err);
/* update iter in case we get called again */
*iter = (*iter)->next;
*saddr = g_inet_socket_address_new (addr, port);
sock =
g_socket_new (g_socket_address_get_family (*saddr),
G_SOCKET_TYPE_STREAM, G_SOCKET_PROTOCOL_TCP, err);
if (sock)
break;
/* release and try next... */
g_clear_object (saddr);
}
return sock;
}