1 /* GStreamer
2 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
3 * Copyright (C) 2020 Huawei Technologies Co., Ltd.
4 * @Author: Stéphane Cerveau <scerveau@collabora.com>
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 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 * Library General Public License for more details.
15 *
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
20 */
21
22 #ifdef HAVE_CONFIG_H
23 #include "config.h"
24 #endif
25
26 #include "gsttcpelements.h"
27
28 GST_DEBUG_CATEGORY (tcp_debug);
29 #define GST_CAT_DEFAULT tcp_debug
30
31 void
tcp_element_init(GstPlugin * plugin)32 tcp_element_init (GstPlugin * plugin)
33 {
34 static gsize res = FALSE;
35 if (g_once_init_enter (&res)) {
36 GST_DEBUG_CATEGORY_INIT (tcp_debug, "tcp", 0, "TCP calls");
37 g_once_init_leave (&res, TRUE);
38 }
39 }
40
41 GList *
tcp_get_addresses(GstElement * obj,const char * host,GCancellable * cancellable,GError ** err)42 tcp_get_addresses (GstElement * obj, const char *host,
43 GCancellable * cancellable, GError ** err)
44 {
45 GList *addrs = NULL;
46 GInetAddress *addr;
47
48 g_return_val_if_fail (GST_IS_ELEMENT (obj), NULL);
49 g_return_val_if_fail (host != NULL, NULL);
50 g_return_val_if_fail (err == NULL || *err == NULL, NULL);
51
52 /* look up name if we need to */
53 addr = g_inet_address_new_from_string (host);
54 if (addr) {
55 addrs = g_list_append (addrs, addr);
56 } else {
57 GResolver *resolver = g_resolver_get_default ();
58
59 GST_DEBUG_OBJECT (obj, "Looking up IP address(es) for host '%s'", host);
60 addrs = g_resolver_lookup_by_name (resolver, host, cancellable, err);
61 g_object_unref (resolver);
62 }
63
64 return addrs;
65 }
66
67 /*
68 * Loops over available addresses until successfully creates a socket
69 *
70 * iter: updated to contain current list position or NULL if finished
71 * saddr: contains current address is successful
72 */
73 GSocket *
tcp_create_socket(GstElement * obj,GList ** iter,guint16 port,GSocketAddress ** saddr,GError ** err)74 tcp_create_socket (GstElement * obj, GList ** iter, guint16 port,
75 GSocketAddress ** saddr, GError ** err)
76 {
77 GSocket *sock = NULL;
78
79 g_return_val_if_fail (GST_IS_ELEMENT (obj), NULL);
80 g_return_val_if_fail (iter != NULL, NULL);
81 g_return_val_if_fail (saddr != NULL, NULL);
82 g_return_val_if_fail (err == NULL || *err == NULL, NULL);
83
84 *saddr = NULL;
85 while (*iter) {
86 GInetAddress *addr = G_INET_ADDRESS ((*iter)->data);
87
88 #ifndef GST_DISABLE_GST_DEBUG
89 {
90 gchar *ip = g_inet_address_to_string (addr);
91 GST_DEBUG_OBJECT (obj, "Trying IP address %s", ip);
92 g_free (ip);
93 }
94 #endif
95 /* clean up from possible previous iterations */
96 g_clear_error (err);
97 /* update iter in case we get called again */
98 *iter = (*iter)->next;
99
100 *saddr = g_inet_socket_address_new (addr, port);
101 sock =
102 g_socket_new (g_socket_address_get_family (*saddr),
103 G_SOCKET_TYPE_STREAM, G_SOCKET_PROTOCOL_TCP, err);
104 if (sock)
105 break;
106
107 /* release and try next... */
108 g_clear_object (saddr);
109 }
110
111 return sock;
112 }
113