229 lines
5.0 KiB
C
229 lines
5.0 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 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2009 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 General Public License as published by
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* the Free Software Foundation; either version 2 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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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 <arpa/inet.h>
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#include <openbsc/debug.h>
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#include <osmocore/msgb.h>
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#include <osmocore/talloc.h>
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#include <openbsc/gsm_data.h>
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#include <osmocore/select.h>
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#include <openbsc/mgcp.h>
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#include <openbsc/telnet_interface.h>
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#include <vty/command.h>
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#include <vty/vty.h>
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/* this is here for the vty... it will never be called */
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void subscr_put() { abort(); }
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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 int source_port = 2427;
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static const char *source_addr = "0.0.0.0";
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static struct bsc_fd bfd;
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static int first_request = 1;
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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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unsigned int rtp_base_port = RTP_PORT_DEFAULT;
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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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}
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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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{0, 0, 0, 0},
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};
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c = getopt_long(argc, argv, "hc:", 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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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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static int read_call_agent(struct bsc_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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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(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: %d %d\n",
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slen, sizeof(addr));
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return -1;
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}
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if (first_request) {
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first_request = 0;
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resp = mgcp_create_rsip();
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if (resp) {
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sendto(bfd.fd, resp->l2h, msgb_l2len(resp), 0,
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(struct sockaddr *) &addr, sizeof(addr));
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msgb_free(resp);
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}
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return 0;
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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(msg);
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msgb_reset(msg);
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if (resp) {
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sendto(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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return 0;
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}
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int bsc_vty_init(struct gsm_network *dummy)
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{
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cmd_init(1);
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vty_init();
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mgcp_vty_init();
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return 0;
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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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struct debug_target *stderr_target;
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tall_bsc_ctx = talloc_named_const(NULL, 1, "mgcp-callagent");
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debug_init();
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stderr_target = debug_target_create_stderr();
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debug_add_target(stderr_target);
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debug_set_all_filter(stderr_target, 1);
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handle_options(argc, argv);
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telnet_init(&dummy_network, 4243);
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rc = mgcp_parse_config(config_file, &dummy_network);
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if (rc < 0)
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return rc;
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/* we need to bind a socket */
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if (rc == 0) {
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bfd.when = BSC_FD_READ;
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bfd.cb = read_call_agent;
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bfd.fd = socket(AF_INET, SOCK_DGRAM, 0);
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if (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(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(source_port);
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inet_aton(source_addr, &addr.sin_addr);
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if (bind(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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bfd.data = msgb_alloc(4096, "mgcp-msg");
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if (!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 (bsc_register_fd(&bfd) != 0) {
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DEBUGP(DMGCP, "Failed to register the fd\n");
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return -1;
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}
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DEBUGP(DMGCP, "Configured for MGCP.\n");
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}
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/* initialisation */
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srand(time(NULL));
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/* main loop */
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while (1) {
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bsc_select_main(0);
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}
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return 0;
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}
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