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00034 #include "asterisk.h"
00035
00036 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 385683 $")
00037
00038 #include <fcntl.h>
00039 #include <sys/signal.h>
00040
00041 #include "asterisk/lock.h"
00042 #include "asterisk/channel.h"
00043 #include "asterisk/config.h"
00044 #include "asterisk/module.h"
00045 #include "asterisk/pbx.h"
00046 #include "asterisk/sched.h"
00047 #include "asterisk/io.h"
00048 #include "asterisk/acl.h"
00049 #include "asterisk/callerid.h"
00050 #include "asterisk/file.h"
00051 #include "asterisk/cli.h"
00052 #include "asterisk/app.h"
00053 #include "asterisk/rtp_engine.h"
00054 #include "asterisk/causes.h"
00055
00056 static const char tdesc[] = "Multicast RTP Paging Channel Driver";
00057
00058
00059 static struct ast_channel *multicast_rtp_request(const char *type, format_t format, const struct ast_channel *requestor, void *data, int *cause);
00060 static int multicast_rtp_call(struct ast_channel *ast, char *dest, int timeout);
00061 static int multicast_rtp_hangup(struct ast_channel *ast);
00062 static struct ast_frame *multicast_rtp_read(struct ast_channel *ast);
00063 static int multicast_rtp_write(struct ast_channel *ast, struct ast_frame *f);
00064
00065
00066 static const struct ast_channel_tech multicast_rtp_tech = {
00067 .type = "MulticastRTP",
00068 .description = tdesc,
00069 .capabilities = -1,
00070 .requester = multicast_rtp_request,
00071 .call = multicast_rtp_call,
00072 .hangup = multicast_rtp_hangup,
00073 .read = multicast_rtp_read,
00074 .write = multicast_rtp_write,
00075 };
00076
00077
00078 static struct ast_frame *multicast_rtp_read(struct ast_channel *ast)
00079 {
00080 return &ast_null_frame;
00081 }
00082
00083
00084 static int multicast_rtp_write(struct ast_channel *ast, struct ast_frame *f)
00085 {
00086 struct ast_rtp_instance *instance = ast->tech_pvt;
00087
00088 return ast_rtp_instance_write(instance, f);
00089 }
00090
00091
00092 static int multicast_rtp_call(struct ast_channel *ast, char *dest, int timeout)
00093 {
00094 struct ast_rtp_instance *instance = ast->tech_pvt;
00095
00096 ast_queue_control(ast, AST_CONTROL_ANSWER);
00097
00098 return ast_rtp_instance_activate(instance);
00099 }
00100
00101
00102 static int multicast_rtp_hangup(struct ast_channel *ast)
00103 {
00104 struct ast_rtp_instance *instance = ast->tech_pvt;
00105
00106 ast_rtp_instance_destroy(instance);
00107
00108 ast->tech_pvt = NULL;
00109
00110 return 0;
00111 }
00112
00113
00114 static struct ast_channel *multicast_rtp_request(const char *type, format_t format, const struct ast_channel *requestor, void *data, int *cause)
00115 {
00116 char *tmp = ast_strdupa(data), *multicast_type = tmp, *destination, *control;
00117 struct ast_rtp_instance *instance;
00118 struct ast_sockaddr control_address;
00119 struct ast_sockaddr destination_address;
00120 struct ast_channel *chan;
00121 format_t fmt = ast_best_codec(format);
00122
00123 ast_sockaddr_setnull(&control_address);
00124
00125
00126 if (ast_strlen_zero(multicast_type)) {
00127 goto failure;
00128 }
00129
00130 if (!(destination = strchr(tmp, '/'))) {
00131 goto failure;
00132 }
00133 *destination++ = '\0';
00134
00135 if ((control = strchr(destination, '/'))) {
00136 *control++ = '\0';
00137 if (!ast_sockaddr_parse(&control_address, control,
00138 PARSE_PORT_REQUIRE)) {
00139 goto failure;
00140 }
00141 }
00142
00143 if (!ast_sockaddr_parse(&destination_address, destination,
00144 PARSE_PORT_REQUIRE)) {
00145 goto failure;
00146 }
00147
00148 if (!(instance = ast_rtp_instance_new("multicast", NULL, &control_address, multicast_type))) {
00149 goto failure;
00150 }
00151
00152 if (!(chan = ast_channel_alloc(1, AST_STATE_DOWN, "", "", "", "", "", requestor ? requestor->linkedid : "", 0, "MulticastRTP/%p", instance))) {
00153 ast_rtp_instance_destroy(instance);
00154 goto failure;
00155 }
00156
00157 ast_rtp_instance_set_remote_address(instance, &destination_address);
00158
00159 chan->tech = &multicast_rtp_tech;
00160 chan->nativeformats = fmt;
00161 chan->writeformat = fmt;
00162 chan->readformat = fmt;
00163 chan->rawwriteformat = fmt;
00164 chan->rawreadformat = fmt;
00165 chan->tech_pvt = instance;
00166
00167 return chan;
00168
00169 failure:
00170 *cause = AST_CAUSE_FAILURE;
00171 return NULL;
00172 }
00173
00174
00175 static int load_module(void)
00176 {
00177 if (ast_channel_register(&multicast_rtp_tech)) {
00178 ast_log(LOG_ERROR, "Unable to register channel class 'MulticastRTP'\n");
00179 return AST_MODULE_LOAD_DECLINE;
00180 }
00181
00182 return AST_MODULE_LOAD_SUCCESS;
00183 }
00184
00185
00186 static int unload_module(void)
00187 {
00188 ast_channel_unregister(&multicast_rtp_tech);
00189
00190 return 0;
00191 }
00192
00193 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Multicast RTP Paging Channel",
00194 .load = load_module,
00195 .unload = unload_module,
00196 .load_pri = AST_MODPRI_CHANNEL_DRIVER,
00197 );