312 lines
7.7 KiB
C
312 lines
7.7 KiB
C
/* A Media Gateway Control Protocol Media Gateway: RFC 3435 */
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/* The main method to drive it as a standalone process */
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/*
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* (C) 2009-2011 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2009-2011 by On-Waves
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <ctype.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <limits.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <openbsc/debug.h>
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#include <openbsc/gsm_data.h>
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#include <openbsc/mgcp.h>
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#include <openbsc/mgcp_internal.h>
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#include <openbsc/vty.h>
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#include <osmocom/core/application.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/select.h>
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#include <osmocom/core/stats.h>
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#include <osmocom/core/rate_ctr.h>
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#include <osmocom/vty/telnet_interface.h>
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#include <osmocom/vty/logging.h>
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#include <osmocom/vty/ports.h>
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#include <osmocom/vty/command.h>
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#include <osmocom/vty/stats.h>
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#include "../../bscconfig.h"
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#ifdef BUILD_MGCP_TRANSCODING
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#include "openbsc/mgcp_transcode.h"
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#endif
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#define _GNU_SOURCE
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#include <getopt.h>
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#warning "Make use of the rtp proxy code"
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static struct mgcp_config *cfg;
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static struct mgcp_trunk_config *reset_trunk;
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static int reset_endpoints = 0;
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static int daemonize = 0;
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const char *openbsc_copyright =
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"Copyright (C) 2009-2010 Holger Freyther and On-Waves\r\n"
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"Contributions by Daniel Willmann, Jan Lübbe, Stefan Schmidt\r\n"
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"Dieter Spaar, Andreas Eversberg, Harald Welte\r\n\r\n"
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"License AGPLv3+: GNU AGPL version 3 or later <http://gnu.org/licenses/agpl-3.0.html>\r\n"
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"This is free software: you are free to change and redistribute it.\r\n"
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"There is NO WARRANTY, to the extent permitted by law.\r\n";
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static char *config_file = "mgcp.cfg";
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/* used by msgb and mgcp */
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void *tall_bsc_ctx = NULL;
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static void print_help()
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{
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printf("Some useful help...\n");
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printf(" -h --help is printing this text.\n");
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printf(" -c --config-file filename The config file to use.\n");
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printf(" -s --disable-color\n");
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printf(" -D --daemonize Fork the process into a background daemon\n");
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printf(" -V --version Print the version number\n");
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}
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static void handle_options(int argc, char **argv)
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{
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while (1) {
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int option_index = 0, c;
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static struct option long_options[] = {
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{"help", 0, 0, 'h'},
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{"config-file", 1, 0, 'c'},
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{"daemonize", 0, 0, 'D'},
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{"version", 0, 0, 'V'},
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{"disable-color", 0, 0, 's'},
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{0, 0, 0, 0},
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};
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c = getopt_long(argc, argv, "hc:VD", long_options, &option_index);
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if (c == -1)
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break;
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switch(c) {
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case 'h':
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print_help();
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exit(0);
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break;
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case 'c':
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config_file = talloc_strdup(tall_bsc_ctx, optarg);
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break;
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case 's':
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log_set_use_color(osmo_stderr_target, 0);
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break;
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case 'V':
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print_version(1);
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exit(0);
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break;
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case 'D':
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daemonize = 1;
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break;
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default:
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/* ignore */
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break;
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};
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}
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}
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/* simply remember this */
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static int mgcp_rsip_cb(struct mgcp_trunk_config *tcfg)
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{
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reset_endpoints = 1;
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reset_trunk = tcfg;
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return 0;
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}
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static int read_call_agent(struct osmo_fd *fd, unsigned int what)
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{
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struct sockaddr_in addr;
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socklen_t slen = sizeof(addr);
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struct msgb *msg;
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struct msgb *resp;
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int i;
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msg = (struct msgb *) fd->data;
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/* read one less so we can use it as a \0 */
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int rc = recvfrom(cfg->gw_fd.bfd.fd, msg->data, msg->data_len - 1, 0,
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(struct sockaddr *) &addr, &slen);
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if (rc < 0) {
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perror("Gateway failed to read");
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return -1;
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} else if (slen > sizeof(addr)) {
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fprintf(stderr, "Gateway received message from outerspace: %zu %zu\n",
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(size_t) slen, sizeof(addr));
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return -1;
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}
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/* handle message now */
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msg->l2h = msgb_put(msg, rc);
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resp = mgcp_handle_message(cfg, msg);
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msgb_reset(msg);
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if (resp) {
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sendto(cfg->gw_fd.bfd.fd, resp->l2h, msgb_l2len(resp), 0, (struct sockaddr *) &addr, sizeof(addr));
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msgb_free(resp);
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}
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if (reset_endpoints) {
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LOGP(DMGCP, LOGL_NOTICE,
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"Asked to reset endpoints: %d/%d\n",
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reset_trunk->trunk_nr, reset_trunk->trunk_type);
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reset_endpoints = 0;
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/* is checking in_addr.s_addr == INADDR_LOOPBACK making it more secure? */
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for (i = 1; i < reset_trunk->number_endpoints; ++i)
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mgcp_release_endp(&reset_trunk->endpoints[i]);
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}
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return 0;
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}
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extern int bsc_vty_go_parent(struct vty *vty);
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static struct vty_app_info vty_info = {
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.name = "OpenBSC MGCP",
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.version = PACKAGE_VERSION,
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.go_parent_cb = bsc_vty_go_parent,
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.is_config_node = bsc_vty_is_config_node,
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};
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int main(int argc, char **argv)
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{
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struct gsm_network dummy_network;
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struct sockaddr_in addr;
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int on = 1, rc;
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tall_bsc_ctx = talloc_named_const(NULL, 1, "mgcp-callagent");
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msgb_talloc_ctx_init(tall_bsc_ctx, 0);
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osmo_init_ignore_signals();
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osmo_init_logging(&log_info);
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cfg = mgcp_config_alloc();
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if (!cfg)
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return -1;
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#ifdef BUILD_MGCP_TRANSCODING
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cfg->setup_rtp_processing_cb = &mgcp_transcoding_setup;
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cfg->rtp_processing_cb = &mgcp_transcoding_process_rtp;
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cfg->get_net_downlink_format_cb = &mgcp_transcoding_net_downlink_format;
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#endif
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vty_info.copyright = openbsc_copyright;
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vty_init(&vty_info);
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logging_vty_add_cmds(&log_info);
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osmo_stats_vty_add_cmds(&log_info);
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mgcp_vty_init();
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handle_options(argc, argv);
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rate_ctr_init(tall_bsc_ctx);
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osmo_stats_init(tall_bsc_ctx);
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rc = mgcp_parse_config(config_file, cfg, MGCP_BSC);
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if (rc < 0)
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return rc;
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/* start telnet after reading config for vty_get_bind_addr() */
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rc = telnet_init_dynif(tall_bsc_ctx, &dummy_network,
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vty_get_bind_addr(), OSMO_VTY_PORT_BSC_MGCP);
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if (rc < 0)
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return rc;
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/* set some callbacks */
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cfg->reset_cb = mgcp_rsip_cb;
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/* we need to bind a socket */
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if (rc == 0) {
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cfg->gw_fd.bfd.when = BSC_FD_READ;
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cfg->gw_fd.bfd.cb = read_call_agent;
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cfg->gw_fd.bfd.fd = socket(AF_INET, SOCK_DGRAM, 0);
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if (cfg->gw_fd.bfd.fd < 0) {
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perror("Gateway failed to listen");
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return -1;
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}
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setsockopt(cfg->gw_fd.bfd.fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
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memset(&addr, 0, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_port = htons(cfg->source_port);
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inet_aton(cfg->source_addr, &addr.sin_addr);
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if (bind(cfg->gw_fd.bfd.fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
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perror("Gateway failed to bind");
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return -1;
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}
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cfg->gw_fd.bfd.data = msgb_alloc(4096, "mgcp-msg");
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if (!cfg->gw_fd.bfd.data) {
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fprintf(stderr, "Gateway memory error.\n");
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return -1;
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}
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if (cfg->call_agent_addr) {
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addr.sin_port = htons(2727);
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inet_aton(cfg->call_agent_addr, &addr.sin_addr);
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if (connect(cfg->gw_fd.bfd.fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
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LOGP(DMGCP, LOGL_ERROR, "Failed to connect to: '%s'. errno: %d\n",
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cfg->call_agent_addr, errno);
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close(cfg->gw_fd.bfd.fd);
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cfg->gw_fd.bfd.fd = -1;
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return -1;
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}
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}
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if (osmo_fd_register(&cfg->gw_fd.bfd) != 0) {
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LOGP(DMGCP, LOGL_FATAL, "Failed to register the fd\n");
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return -1;
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}
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LOGP(DMGCP, LOGL_NOTICE, "Configured for MGCP.\n");
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}
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/* initialisation */
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srand(time(NULL));
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if (daemonize) {
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rc = osmo_daemonize();
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if (rc < 0) {
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perror("Error during daemonize");
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exit(1);
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}
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}
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/* main loop */
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while (1) {
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osmo_select_main(0);
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}
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return 0;
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}
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