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-rw-r--r--src/mgcp_callagent.c154
1 files changed, 154 insertions, 0 deletions
diff --git a/src/mgcp_callagent.c b/src/mgcp_callagent.c
new file mode 100644
index 0000000..06efb5a
--- /dev/null
+++ b/src/mgcp_callagent.c
@@ -0,0 +1,154 @@
+/*
+ * (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);
+ }
+}
+