osmo-bsc: Start adding code for the osmo_bsc..
This adds the unix domain socket rf control protocol into
the new subdirectory.
diff --git a/openbsc/src/bsc/osmo_bsc_rf.c b/openbsc/src/bsc/osmo_bsc_rf.c
new file mode 100644
index 0000000..8cfbb7c
--- /dev/null
+++ b/openbsc/src/bsc/osmo_bsc_rf.c
@@ -0,0 +1,249 @@
+/* RF Ctl handling socket */
+
+/* (C) 2010 by Harald Welte <laforge@gnumonks.org>
+ * (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 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 <openbsc/osmo_bsc_rf.h>
+#include <openbsc/debug.h>
+#include <openbsc/gsm_data.h>
+
+#include <osmocore/talloc.h>
+#include <osmocore/protocol/gsm_12_21.h>
+
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#include <errno.h>
+#include <unistd.h>
+
+#define RF_CMD_QUERY '?'
+#define RF_CMD_OFF '0'
+#define RF_CMD_ON '1'
+
+static int lock_each_trx(struct gsm_network *net, int lock)
+{
+ struct gsm_bts *bts;
+
+ llist_for_each_entry(bts, &net->bts_list, list) {
+ struct gsm_bts_trx *trx;
+ llist_for_each_entry(trx, &bts->trx_list, list) {
+ gsm_trx_lock_rf(trx, lock);
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * Send a '1' when one TRX is online, otherwise send 0
+ */
+static void handle_query(struct osmo_bsc_rf_conn *conn)
+{
+ struct msgb *msg;
+ struct gsm_bts *bts;
+ char send = RF_CMD_OFF;
+
+ llist_for_each_entry(bts, &conn->gsm_network->bts_list, list) {
+ struct gsm_bts_trx *trx;
+ llist_for_each_entry(trx, &bts->trx_list, list) {
+ if (trx->nm_state.availability == NM_AVSTATE_OK &&
+ trx->nm_state.operational != NM_STATE_LOCKED) {
+ send = RF_CMD_ON;
+ break;
+ }
+ }
+ }
+
+ msg = msgb_alloc(10, "RF Query");
+ if (!msg) {
+ LOGP(DINP, LOGL_ERROR, "Failed to allocate response msg.\n");
+ return;
+ }
+
+ msg->l2h = msgb_put(msg, 1);
+ msg->l2h[0] = send;
+
+ if (write_queue_enqueue(&conn->queue, msg) != 0) {
+ LOGP(DINP, LOGL_ERROR, "Failed to enqueue the answer.\n");
+ msgb_free(msg);
+ return;
+ }
+
+ return;
+}
+
+static int rf_read_cmd(struct bsc_fd *fd)
+{
+ struct osmo_bsc_rf_conn *conn = fd->data;
+ char buf[1];
+ int rc;
+
+ rc = read(fd->fd, buf, sizeof(buf));
+ if (rc != sizeof(buf)) {
+ LOGP(DINP, LOGL_ERROR, "Short read %d/%s\n", errno, strerror(errno));
+ bsc_unregister_fd(fd);
+ close(fd->fd);
+ write_queue_clear(&conn->queue);
+ talloc_free(conn);
+ return -1;
+ }
+
+ switch (buf[0]) {
+ case RF_CMD_QUERY:
+ handle_query(conn);
+ break;
+ case RF_CMD_OFF:
+ lock_each_trx(conn->gsm_network, 1);
+ break;
+ case RF_CMD_ON:
+ lock_each_trx(conn->gsm_network, 0);
+ break;
+ default:
+ LOGP(DINP, LOGL_ERROR, "Unknown command %d\n", buf[0]);
+ break;
+ }
+
+ return 0;
+}
+
+static int rf_write_cmd(struct bsc_fd *fd, struct msgb *msg)
+{
+ int rc;
+
+ rc = write(fd->fd, msg->data, msg->len);
+ if (rc != msg->len) {
+ LOGP(DINP, LOGL_ERROR, "Short write %d/%s\n", errno, strerror(errno));
+ return -1;
+ }
+
+ return 0;
+}
+
+static int rf_ctl_accept(struct bsc_fd *bfd, unsigned int what)
+{
+ struct osmo_bsc_rf_conn *conn;
+ struct osmo_bsc_rf *rf = bfd->data;
+ struct sockaddr_un addr;
+ socklen_t len = sizeof(addr);
+ int fd;
+
+ fd = accept(bfd->fd, (struct sockaddr *) &addr, &len);
+ if (fd < 0) {
+ LOGP(DINP, LOGL_ERROR, "Failed to accept. errno: %d/%s\n",
+ errno, strerror(errno));
+ return -1;
+ }
+
+ conn = talloc_zero(rf, struct osmo_bsc_rf_conn);
+ if (!conn) {
+ LOGP(DINP, LOGL_ERROR, "Failed to allocate mem.\n");
+ close(fd);
+ return -1;
+ }
+
+ write_queue_init(&conn->queue, 10);
+ conn->queue.bfd.data = conn;
+ conn->queue.bfd.fd = fd;
+ conn->queue.bfd.when = BSC_FD_READ | BSC_FD_WRITE;
+ conn->queue.read_cb = rf_read_cmd;
+ conn->queue.write_cb = rf_write_cmd;
+ conn->gsm_network = rf->gsm_network;
+
+ if (bsc_register_fd(&conn->queue.bfd) != 0) {
+ close(fd);
+ talloc_free(conn);
+ return -1;
+ }
+
+ return 0;
+}
+
+struct osmo_bsc_rf *osmo_bsc_rf_create(const char *path, struct gsm_network *net)
+{
+ unsigned int namelen;
+ struct sockaddr_un local;
+ struct bsc_fd *bfd;
+ struct osmo_bsc_rf *rf;
+ int rc;
+
+ rf = talloc_zero(NULL, struct osmo_bsc_rf);
+ if (!rf) {
+ LOGP(DINP, LOGL_ERROR, "Failed to create osmo_bsc_rf.\n");
+ return NULL;
+ }
+
+ bfd = &rf->listen;
+ bfd->fd = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (bfd->fd < 0) {
+ LOGP(DINP, LOGL_ERROR, "Can not create socket. %d/%s\n",
+ errno, strerror(errno));
+ return NULL;
+ }
+
+ local.sun_family = AF_UNIX;
+ strncpy(local.sun_path, path, sizeof(local.sun_path));
+ local.sun_path[sizeof(local.sun_path) - 1] = '\0';
+ unlink(local.sun_path);
+
+ /* we use the same magic that X11 uses in Xtranssock.c for
+ * calculating the proper length of the sockaddr */
+#if defined(BSD44SOCKETS) || defined(__UNIXWARE__)
+ local.sun_len = strlen(local.sun_path);
+#endif
+#if defined(BSD44SOCKETS) || defined(SUN_LEN)
+ namelen = SUN_LEN(&local);
+#else
+ namelen = strlen(local.sun_path) +
+ offsetof(struct sockaddr_un, sun_path);
+#endif
+
+ rc = bind(bfd->fd, (struct sockaddr *) &local, namelen);
+ if (rc != 0) {
+ LOGP(DINP, LOGL_ERROR, "Failed to bind '%s' errno: %d/%s\n",
+ local.sun_path, errno, strerror(errno));
+ close(bfd->fd);
+ talloc_free(rf);
+ return NULL;
+ }
+
+ if (listen(bfd->fd, 0) != 0) {
+ LOGP(DINP, LOGL_ERROR, "Failed to listen: %d/%s\n", errno, strerror(errno));
+ close(bfd->fd);
+ talloc_free(rf);
+ return NULL;
+ }
+
+ bfd->when = BSC_FD_READ;
+ bfd->cb = rf_ctl_accept;
+ bfd->data = rf;
+
+ if (bsc_register_fd(bfd) != 0) {
+ LOGP(DINP, LOGL_ERROR, "Failed to register bfd.\n");
+ close(bfd->fd);
+ talloc_free(rf);
+ return NULL;
+ }
+
+ rf->gsm_network = net;
+
+ return rf;
+}
+