155 lines
3.9 KiB
C
155 lines
3.9 KiB
C
/*
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* (C) 2010-2012 by Holger Hans Peter Freyther
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* (C) 2010-2012 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 <mgcp_callagent.h>
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#include <cellmgr_debug.h>
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#include <netinet/tcp.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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static int mgcp_do_write(struct osmo_fd *fd, struct msgb *msg)
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{
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int ret;
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LOGP(DMGCP, LOGL_DEBUG, "Sending msg to MGCP GW size: %u\n", msg->len);
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ret = write(fd->fd, msg->data, msg->len);
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if (ret != msg->len) {
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LOGP(DMGCP, LOGL_ERROR,
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"Failed to forward message to MGCP GW (%s).\n",
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strerror(errno));
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}
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return ret;
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}
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static int mgcp_do_read(struct osmo_fd *fd)
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{
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struct mgcp_callagent *agent;
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struct msgb *mgcp;
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int ret;
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agent = fd->data;
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mgcp = msgb_alloc_headroom(4096, 128, "mgcp_from_gw");
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if (!mgcp) {
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LOGP(DMGCP, LOGL_ERROR, "Failed to allocate MGCP message.\n");
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return -1;
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}
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ret = read(fd->fd, mgcp->data, 4096 - 128);
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if (ret <= 0) {
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LOGP(DMGCP, LOGL_ERROR, "Failed to read: %d/%s\n", errno, strerror(errno));
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msgb_free(mgcp);
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return -1;
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} else if (ret > 4096 - 128) {
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LOGP(DMGCP, LOGL_ERROR, "Too much data: %d\n", ret);
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msgb_free(mgcp);
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return -1;
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}
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mgcp->l2h = msgb_put(mgcp, ret);
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agent->read_cb(agent, mgcp);
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return 0;
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}
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int mgcp_create_port(struct mgcp_callagent *agent)
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{
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int on;
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struct sockaddr_in addr;
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agent->queue.bfd.fd = socket(AF_INET, SOCK_DGRAM, 0);
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if (agent->queue.bfd.fd < 0) {
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LOGP(DMGCP, LOGL_FATAL, "Failed to create UDP socket errno: %d\n", errno);
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return -1;
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}
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on = 1;
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setsockopt(agent->queue.bfd.fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
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/* try to bind the socket */
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memset(&addr, 0, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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addr.sin_port = 0;
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if (bind(agent->queue.bfd.fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
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LOGP(DMGCP, LOGL_FATAL, "Failed to bind to any port.\n");
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close(agent->queue.bfd.fd);
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agent->queue.bfd.fd = -1;
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return -1;
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}
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/* connect to the remote */
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addr.sin_port = htons(2427);
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if (connect(agent->queue.bfd.fd, (struct sockaddr *) & addr, sizeof(addr)) < 0) {
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LOGP(DMGCP, LOGL_FATAL, "Failed to connect to local MGCP GW. %s\n", strerror(errno));
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close(agent->queue.bfd.fd);
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agent->queue.bfd.fd = -1;
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return -1;
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}
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osmo_wqueue_init(&agent->queue, 10);
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agent->queue.bfd.data = agent;
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agent->queue.bfd.when = BSC_FD_READ;
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agent->queue.read_cb = mgcp_do_read;
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agent->queue.write_cb = mgcp_do_write;
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if (osmo_fd_register(&agent->queue.bfd) != 0) {
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LOGP(DMGCP, LOGL_FATAL, "Failed to register BFD\n");
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close(agent->queue.bfd.fd);
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agent->queue.bfd.fd = -1;
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return -1;
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}
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return 0;
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}
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void mgcp_forward(struct mgcp_callagent *agent, const uint8_t *data,
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unsigned int length)
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{
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struct msgb *mgcp;
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if (length > 4096) {
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LOGP(DMGCP, LOGL_ERROR, "Can not forward too big message.\n");
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return;
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}
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mgcp = msgb_alloc(4096, "mgcp_to_gw");
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if (!mgcp) {
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LOGP(DMGCP, LOGL_ERROR, "Failed to send message.\n");
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return;
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}
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msgb_put(mgcp, length);
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memcpy(mgcp->data, data, mgcp->len);
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if (osmo_wqueue_enqueue(&agent->queue, mgcp) != 0) {
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LOGP(DMGCP, LOGL_FATAL, "Could not queue message to MGCP GW.\n");
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msgb_free(mgcp);
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}
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}
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