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-rw-r--r--src/libbsc/bsc_msc.c259
1 files changed, 259 insertions, 0 deletions
diff --git a/src/libbsc/bsc_msc.c b/src/libbsc/bsc_msc.c
new file mode 100644
index 00000000..508697ab
--- /dev/null
+++ b/src/libbsc/bsc_msc.c
@@ -0,0 +1,259 @@
+/* Routines to talk to the MSC using the IPA Protocol */
+/*
+ * (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
+ * (C) 2010 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 <openbsc/bsc_msc.h>
+#include <openbsc/debug.h>
+#include <openbsc/ipaccess.h>
+
+#include <osmocore/write_queue.h>
+#include <osmocore/talloc.h>
+
+#include <arpa/inet.h>
+#include <sys/socket.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+static void connection_loss(struct bsc_msc_connection *con)
+{
+ struct bsc_fd *fd;
+
+ fd = &con->write_queue.bfd;
+
+ close(fd->fd);
+ fd->fd = -1;
+ fd->cb = write_queue_bfd_cb;
+ fd->when = 0;
+
+ con->is_connected = 0;
+ con->first_contact = 0;
+ con->connection_loss(con);
+}
+
+static void msc_con_timeout(void *_con)
+{
+ struct bsc_msc_connection *con = _con;
+
+ LOGP(DMSC, LOGL_ERROR, "MSC Connection timeout.\n");
+ bsc_msc_lost(con);
+}
+
+/* called in the case of a non blocking connect */
+static int msc_connection_connect(struct bsc_fd *fd, unsigned int what)
+{
+ int rc;
+ int val;
+ struct bsc_msc_connection *con;
+ struct write_queue *queue;
+
+ socklen_t len = sizeof(val);
+
+ if ((what & BSC_FD_WRITE) == 0) {
+ LOGP(DMSC, LOGL_ERROR, "Callback but not writable.\n");
+ return -1;
+ }
+
+ queue = container_of(fd, struct write_queue, bfd);
+ con = container_of(queue, struct bsc_msc_connection, write_queue);
+
+ /* From here on we will either be connected or reconnect */
+ bsc_del_timer(&con->timeout_timer);
+
+ /* check the socket state */
+ rc = getsockopt(fd->fd, SOL_SOCKET, SO_ERROR, &val, &len);
+ if (rc != 0) {
+ LOGP(DMSC, LOGL_ERROR, "getsockopt for the MSC socket failed.\n");
+ goto error;
+ }
+ if (val != 0) {
+ LOGP(DMSC, LOGL_ERROR, "Not connected to the MSC: %d\n", val);
+ goto error;
+ }
+
+
+ /* go to full operation */
+ fd->cb = write_queue_bfd_cb;
+ fd->when = BSC_FD_READ | BSC_FD_EXCEPT;
+
+ con->is_connected = 1;
+ LOGP(DMSC, LOGL_NOTICE, "(Re)Connected to the MSC.\n");
+ if (con->connected)
+ con->connected(con);
+ return 0;
+
+error:
+ bsc_unregister_fd(fd);
+ connection_loss(con);
+ return -1;
+}
+static void setnonblocking(struct bsc_fd *fd)
+{
+ int flags;
+
+ flags = fcntl(fd->fd, F_GETFL);
+ if (flags < 0) {
+ perror("fcntl get failed");
+ close(fd->fd);
+ fd->fd = -1;
+ return;
+ }
+
+ flags |= O_NONBLOCK;
+ flags = fcntl(fd->fd, F_SETFL, flags);
+ if (flags < 0) {
+ perror("fcntl get failed");
+ close(fd->fd);
+ fd->fd = -1;
+ return;
+ }
+}
+
+int bsc_msc_connect(struct bsc_msc_connection *con)
+{
+ struct bsc_fd *fd;
+ struct sockaddr_in sin;
+ int on = 1, ret;
+
+ LOGP(DMSC, LOGL_NOTICE, "Attempting to connect MSC at %s:%d\n", con->ip, con->port);
+
+ con->is_connected = 0;
+
+ fd = &con->write_queue.bfd;
+ fd->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+ fd->priv_nr = 1;
+
+ if (fd->fd < 0) {
+ perror("Creating TCP socket failed");
+ return fd->fd;
+ }
+
+ /* make it non blocking */
+ setnonblocking(fd);
+
+ /* set the socket priority */
+ ret = setsockopt(fd->fd, IPPROTO_IP, IP_TOS,
+ &con->prio, sizeof(con->prio));
+ if (ret != 0)
+ LOGP(DMSC, LOGL_ERROR, "Failed to set prio to %d. %s\n",
+ con->prio, strerror(errno));
+
+ memset(&sin, 0, sizeof(sin));
+ sin.sin_family = AF_INET;
+ sin.sin_port = htons(con->port);
+ inet_aton(con->ip, &sin.sin_addr);
+
+ setsockopt(fd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
+ ret = connect(fd->fd, (struct sockaddr *) &sin, sizeof(sin));
+
+ if (ret == -1 && errno == EINPROGRESS) {
+ LOGP(DMSC, LOGL_ERROR, "MSC Connection in progress\n");
+ fd->when = BSC_FD_WRITE;
+ fd->cb = msc_connection_connect;
+ con->timeout_timer.cb = msc_con_timeout;
+ con->timeout_timer.data = con;
+ bsc_schedule_timer(&con->timeout_timer, 20, 0);
+ } else if (ret < 0) {
+ perror("Connection failed");
+ connection_loss(con);
+ return ret;
+ } else {
+ fd->when = BSC_FD_READ | BSC_FD_EXCEPT;
+ fd->cb = write_queue_bfd_cb;
+ con->is_connected = 1;
+ if (con->connected)
+ con->connected(con);
+ }
+
+ ret = bsc_register_fd(fd);
+ if (ret < 0) {
+ perror("Registering the fd failed");
+ close(fd->fd);
+ return ret;
+ }
+
+ return ret;
+}
+
+struct bsc_msc_connection *bsc_msc_create(const char *ip, int port, int prio)
+{
+ struct bsc_msc_connection *con;
+
+ con = talloc_zero(NULL, struct bsc_msc_connection);
+ if (!con) {
+ LOGP(DMSC, LOGL_FATAL, "Failed to create the MSC connection.\n");
+ return NULL;
+ }
+
+ con->ip = ip;
+ con->port = port;
+ con->prio = prio;
+ write_queue_init(&con->write_queue, 100);
+ return con;
+}
+
+void bsc_msc_lost(struct bsc_msc_connection *con)
+{
+ write_queue_clear(&con->write_queue);
+ bsc_del_timer(&con->timeout_timer);
+
+ if (con->write_queue.bfd.fd >= 0)
+ bsc_unregister_fd(&con->write_queue.bfd);
+ connection_loss(con);
+}
+
+static void reconnect_msc(void *_msc)
+{
+ struct bsc_msc_connection *con = _msc;
+
+ LOGP(DMSC, LOGL_NOTICE, "Attempting to reconnect to the MSC.\n");
+ bsc_msc_connect(con);
+}
+
+void bsc_msc_schedule_connect(struct bsc_msc_connection *con)
+{
+ LOGP(DMSC, LOGL_NOTICE, "Attempting to reconnect to the MSC.\n");
+ con->reconnect_timer.cb = reconnect_msc;
+ con->reconnect_timer.data = con;
+ bsc_schedule_timer(&con->reconnect_timer, 5, 0);
+}
+
+struct msgb *bsc_msc_id_get_resp(const char *token)
+{
+ struct msgb *msg;
+
+ if (!token) {
+ LOGP(DMSC, LOGL_ERROR, "No token specified.\n");
+ return NULL;
+ }
+
+ msg = msgb_alloc_headroom(4096, 128, "id resp");
+ if (!msg) {
+ LOGP(DMSC, LOGL_ERROR, "Failed to create the message.\n");
+ return NULL;
+ }
+
+ msg->l2h = msgb_v_put(msg, IPAC_MSGT_ID_RESP);
+ msgb_l16tv_put(msg, strlen(token) + 1,
+ IPAC_IDTAG_UNITNAME, (u_int8_t *) token);
+ return msg;
+}