aboutsummaryrefslogtreecommitdiffstats
path: root/apps/app_transfer.c
blob: aaff52be0d9b640303db4c64a1e83e20b56e4bca (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005, Digium, Inc.
 *
 * Mark Spencer <markster@digium.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*! \file
 *
 * \brief Transfer a caller
 * 
 * Requires transfer support from channel driver
 *
 * \ingroup applications
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision$")

#include "asterisk/lock.h"
#include "asterisk/file.h"
#include "asterisk/logger.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/module.h"
#include "asterisk/options.h"
#include "asterisk/app.h"

STANDARD_LOCAL_USER;

LOCAL_USER_DECL;

static const char *tdesc = "Transfer";

static const char *app = "Transfer";

static const char *synopsis = "Transfer caller to remote extension";

static const char *descrip = 
"  Transfer([Tech/]dest[|options]):  Requests the remote caller be transferred\n"
"to a given destination. If TECH (SIP, IAX2, LOCAL etc) is used, only\n"
"an incoming call with the same channel technology will be transfered.\n"
"Note that for SIP, if you transfer before call is setup, a 302 redirect\n"
"SIP message will be returned to the caller.\n"
"\nThe result of the application will be reported in the TRANSFERSTATUS\n"
"channel variable:\n"
"       SUCCESS      Transfer succeeded\n"
"       FAILURE      Transfer failed\n"
"       UNSUPPORTED  Transfer unsupported by channel driver\n"
"The option string many contain the following character:\n"
"'j' -- jump to n+101 priority if the channel transfer attempt\n"
"       fails\n";

static int transfer_exec(struct ast_channel *chan, void *data)
{
	int res;
	int len;
	struct localuser *u;
	char *slash;
	char *tech = NULL;
	char *dest = NULL;
	char *status;
	char *parse;
	int priority_jump = 0;
	AST_DECLARE_APP_ARGS(args,
		AST_APP_ARG(dest);
		AST_APP_ARG(options);
	);

	LOCAL_USER_ADD(u);

	if (ast_strlen_zero((char *)data)) {
		ast_log(LOG_WARNING, "Transfer requires an argument ([Tech/]destination[|options])\n");
		LOCAL_USER_REMOVE(u);
		pbx_builtin_setvar_helper(chan, "TRANSFERSTATUS", "FAILURE");
		return 0;
	} else {
		parse = ast_strdupa(data);
		if (!parse) {
			ast_log(LOG_ERROR, "Out of memory!\n");
			LOCAL_USER_REMOVE(u);
			return -1;
		}
	}

	AST_STANDARD_APP_ARGS(args, parse);

	if (args.options) {
		if (strchr(args.options, 'j'))
			priority_jump = 1;
	}

	dest = args.dest;

	if ((slash = strchr(dest, '/')) && (len = (slash - dest))) {
		tech = dest;
		dest = slash + 1;
		/* Allow execution only if the Tech/destination agrees with the type of the channel */
		if (strncasecmp(chan->type, tech, len)) {
			pbx_builtin_setvar_helper(chan, "TRANSFERSTATUS", "FAILURE");
			LOCAL_USER_REMOVE(u);
			return 0;
		}
	}

	/* Check if the channel supports transfer before we try it */
	if (!chan->tech->transfer) {
		pbx_builtin_setvar_helper(chan, "TRANSFERSTATUS", "UNSUPPORTED");
		LOCAL_USER_REMOVE(u);
		return 0;
	}

	res = ast_transfer(chan, dest);

	if (res < 0) {
		status = "FAILURE";
		if (priority_jump || option_priority_jumping)
			ast_goto_if_exists(chan, chan->context, chan->exten, chan->priority + 101);
		res = 0;
	} else {
		status = "SUCCESS";
		res = 0;
	}

	pbx_builtin_setvar_helper(chan, "TRANSFERSTATUS", status);

	LOCAL_USER_REMOVE(u);

	return res;
}

int unload_module(void)
{
	int res;

	res = ast_unregister_application(app);

	STANDARD_HANGUP_LOCALUSERS;

	return res;	
}

int load_module(void)
{
	return ast_register_application(app, transfer_exec, synopsis, descrip);
}

char *description(void)
{
	return (char *) tdesc;
}

int usecount(void)
{
	int res;

	STANDARD_USECOUNT(res);

	return res;
}

char *key()
{
	return ASTERISK_GPL_KEY;
}