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/* A Media Gateway Control Protocol Media Gateway: RFC 3435 */
/* The main method to drive it as a standalone process */
/*
* (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
* (C) 2009 by On-Waves
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <limits.h>
#include <unistd.h>
#include <sys/socket.h>
#include <openbsc/debug.h>
#include <osmocore/msgb.h>
#include <osmocore/talloc.h>
#include <openbsc/gsm_data.h>
#include <osmocore/select.h>
#include <openbsc/mgcp.h>
#include <openbsc/telnet_interface.h>
/* this is here for the vty... it will never be called */
void subscr_put() { abort(); }
#define _GNU_SOURCE
#include <getopt.h>
#warning "Make use of the rtp proxy code"
static struct bsc_fd bfd;
static int first_request = 1;
static struct mgcp_config *cfg;
static char *config_file = "mgcp.cfg";
/* used by msgb and mgcp */
void *tall_bsc_ctx = NULL;
static void print_help()
{
printf("Some useful help...\n");
printf(" -h --help is printing this text.\n");
printf(" -c --config-file filename The config file to use.\n");
}
static void handle_options(int argc, char** argv)
{
while (1) {
int option_index = 0, c;
static struct option long_options[] = {
{"help", 0, 0, 'h'},
{"config-file", 1, 0, 'c'},
{0, 0, 0, 0},
};
c = getopt_long(argc, argv, "hc:", long_options, &option_index);
if (c == -1)
break;
switch(c) {
case 'h':
print_help();
exit(0);
break;
case 'c':
config_file = talloc_strdup(tall_bsc_ctx, optarg);
break;
default:
/* ignore */
break;
};
}
}
static int read_call_agent(struct bsc_fd *fd, unsigned int what)
{
struct sockaddr_in addr;
socklen_t slen = sizeof(addr);
struct msgb *msg;
struct msgb *resp;
msg = (struct msgb *) fd->data;
/* read one less so we can use it as a \0 */
int rc = recvfrom(bfd.fd, msg->data, msg->data_len - 1, 0,
(struct sockaddr *) &addr, &slen);
if (rc < 0) {
perror("Gateway failed to read");
return -1;
} else if (slen > sizeof(addr)) {
fprintf(stderr, "Gateway received message from outerspace: %d %d\n",
slen, sizeof(addr));
return -1;
}
if (first_request) {
first_request = 0;
resp = mgcp_create_rsip();
if (resp) {
sendto(bfd.fd, resp->l2h, msgb_l2len(resp), 0,
(struct sockaddr *) &addr, sizeof(addr));
msgb_free(resp);
}
return 0;
}
/* handle message now */
msg->l2h = msgb_put(msg, rc);
resp = mgcp_handle_message(cfg, msg);
msgb_reset(msg);
if (resp) {
sendto(bfd.fd, resp->l2h, msgb_l2len(resp), 0, (struct sockaddr *) &addr, sizeof(addr));
msgb_free(resp);
}
return 0;
}
int main(int argc, char** argv)
{
struct gsm_network dummy_network;
struct sockaddr_in addr;
int on = 1, rc;
struct debug_target *stderr_target;
tall_bsc_ctx = talloc_named_const(NULL, 1, "mgcp-callagent");
debug_init();
stderr_target = debug_target_create_stderr();
debug_add_target(stderr_target);
debug_set_all_filter(stderr_target, 1);
cfg = mgcp_config_alloc();
if (!cfg)
return -1;
handle_options(argc, argv);
telnet_init(&dummy_network, 4243);
rc = mgcp_parse_config(config_file, cfg);
if (rc < 0)
return rc;
/* we need to bind a socket */
if (rc == 0) {
bfd.when = BSC_FD_READ;
bfd.cb = read_call_agent;
bfd.fd = socket(AF_INET, SOCK_DGRAM, 0);
if (bfd.fd < 0) {
perror("Gateway failed to listen");
return -1;
}
setsockopt(bfd.fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(cfg->source_port);
inet_aton(cfg->source_addr, &addr.sin_addr);
if (bind(bfd.fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
perror("Gateway failed to bind");
return -1;
}
bfd.data = msgb_alloc(4096, "mgcp-msg");
if (!bfd.data) {
fprintf(stderr, "Gateway memory error.\n");
return -1;
}
if (bsc_register_fd(&bfd) != 0) {
DEBUGP(DMGCP, "Failed to register the fd\n");
return -1;
}
DEBUGP(DMGCP, "Configured for MGCP.\n");
}
/* initialisation */
srand(time(NULL));
/* main loop */
while (1) {
bsc_select_main(0);
}
return 0;
}
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