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/*
* (C) 2010-2012 by Holger Hans Peter Freyther
* (C) 2010-2012 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 Affero General Public License as published by
* the Free Software Foundation, either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <mgcp_callagent.h>
#include <cellmgr_debug.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/tcp.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
static int mgcp_do_write(struct osmo_fd *fd, struct msgb *msg)
{
int ret;
LOGP(DMGCP, LOGL_DEBUG, "Sending msg to MGCP GW size: %u\n", msg->len);
ret = write(fd->fd, msg->data, msg->len);
if (ret != msg->len) {
LOGP(DMGCP, LOGL_ERROR,
"Failed to forward message to MGCP GW (%s).\n",
strerror(errno));
}
return ret;
}
static int mgcp_do_read(struct osmo_fd *fd)
{
struct mgcp_callagent *agent;
struct msgb *mgcp;
int ret;
agent = fd->data;
mgcp = msgb_alloc_headroom(4096, 128, "mgcp_from_gw");
if (!mgcp) {
LOGP(DMGCP, LOGL_ERROR, "Failed to allocate MGCP message.\n");
return -1;
}
ret = read(fd->fd, mgcp->data, 4096 - 128);
if (ret <= 0) {
LOGP(DMGCP, LOGL_ERROR, "Failed to read: %d/%s\n", errno, strerror(errno));
msgb_free(mgcp);
return -1;
} else if (ret > 4096 - 128) {
LOGP(DMGCP, LOGL_ERROR, "Too much data: %d\n", ret);
msgb_free(mgcp);
return -1;
}
mgcp->l2h = msgb_put(mgcp, ret);
agent->read_cb(agent, mgcp);
return 0;
}
int mgcp_create_port(struct mgcp_callagent *agent)
{
int on;
struct sockaddr_in addr;
agent->queue.bfd.fd = socket(AF_INET, SOCK_DGRAM, 0);
if (agent->queue.bfd.fd < 0) {
LOGP(DMGCP, LOGL_FATAL, "Failed to create UDP socket errno: %d\n", errno);
return -1;
}
on = 1;
setsockopt(agent->queue.bfd.fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
/* try to bind the socket */
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
addr.sin_port = 0;
if (bind(agent->queue.bfd.fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
LOGP(DMGCP, LOGL_FATAL, "Failed to bind to any port.\n");
close(agent->queue.bfd.fd);
agent->queue.bfd.fd = -1;
return -1;
}
/* connect to the remote */
addr.sin_port = htons(2427);
if (connect(agent->queue.bfd.fd, (struct sockaddr *) & addr, sizeof(addr)) < 0) {
LOGP(DMGCP, LOGL_FATAL, "Failed to connect to local MGCP GW. %s\n", strerror(errno));
close(agent->queue.bfd.fd);
agent->queue.bfd.fd = -1;
return -1;
}
osmo_wqueue_init(&agent->queue, 10);
agent->queue.bfd.data = agent;
agent->queue.bfd.when = BSC_FD_READ;
agent->queue.read_cb = mgcp_do_read;
agent->queue.write_cb = mgcp_do_write;
if (osmo_fd_register(&agent->queue.bfd) != 0) {
LOGP(DMGCP, LOGL_FATAL, "Failed to register BFD\n");
close(agent->queue.bfd.fd);
agent->queue.bfd.fd = -1;
return -1;
}
return 0;
}
void mgcp_forward(struct mgcp_callagent *agent, const uint8_t *data,
unsigned int length)
{
struct msgb *mgcp;
if (length > 4096) {
LOGP(DMGCP, LOGL_ERROR, "Can not forward too big message.\n");
return;
}
mgcp = msgb_alloc(4096, "mgcp_to_gw");
if (!mgcp) {
LOGP(DMGCP, LOGL_ERROR, "Failed to send message.\n");
return;
}
msgb_put(mgcp, length);
memcpy(mgcp->data, data, mgcp->len);
if (osmo_wqueue_enqueue(&agent->queue, mgcp) != 0) {
LOGP(DMGCP, LOGL_FATAL, "Could not queue message to MGCP GW.\n");
msgb_free(mgcp);
}
}
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