[bsc_msc_ip] Implement a simple RF lock command interface

Right now this is using unix domain sockets and it only
supports query, on and off as commands. In the future we
want to have a vty<->snmp bridge or at least more status
exposed via snmp.

openbsc/include/openbsc/Makefile.am

@@ -6,7 +6,7 @@ noinst_HEADERS = abis_nm.h abis_rsl.h db.h gsm_04_08.h gsm_data.h \
 		 bsc_rll.h mncc.h transaction.h ussd.h gsm_04_80.h \
 		 silent_call.h mgcp.h meas_rep.h rest_octets.h \
 		 system_information.h handover.h mgcp_internal.h \
-		 vty.h bssap.h bsc_msc.h bsc_nat.h
+		 vty.h bssap.h bsc_msc.h bsc_nat.h bsc_msc_rf.h
 
 openbsc_HEADERS = gsm_04_08.h meas_rep.h bsc_api.h
 openbscdir = $(includedir)/openbsc

openbsc/include/openbsc/bsc_msc_rf.h

@@ -0,0 +1,20 @@
+#ifndef BSC_MSC_RF
+#define BSC_MSC_RF
+
+#include <osmocore/write_queue.h>
+
+struct gsm_network;
+
+struct bsc_msc_rf {
+	struct bsc_fd listen;
+	struct gsm_network *gsm_network;
+};
+
+struct bsc_msc_rf_conn {
+	struct write_queue queue;
+	struct gsm_network *gsm_network;
+};
+
+struct bsc_msc_rf *bsc_msc_rf_create(const char *path, struct gsm_network *net);
+
+#endif

openbsc/src/Makefile.am

@@ -35,7 +35,7 @@ bsc_hack_LDADD = libmsc.a libbsc.a libmsc.a libvty.a -ldl -ldbi $(LIBCRYPT)
 bs11_config_SOURCES = bs11_config.c abis_nm.c gsm_data.c debug.c \
 		      rs232.c bts_siemens_bs11.c
 bsc_msc_ip_SOURCES = bssap.c bsc_msc_ip.c bsc_init.c vty_interface.c vty_interface_bsc.c \
-		bsc_msc.c
+		bsc_msc.c bsc_msc_rf.c
 bsc_msc_ip_LDADD = libbsc.a libvty.a libsccp.a
 
 

openbsc/src/bsc_msc_ip.c

@@ -44,6 +44,7 @@
 #include <openbsc/chan_alloc.h>
 #include <openbsc/bsc_msc.h>
 #include <openbsc/bsc_nat.h>
+#include <openbsc/bsc_msc_rf.h>
 
 #include <osmocore/select.h>
 #include <osmocore/talloc.h>
@@ -63,6 +64,7 @@ static struct bsc_msc_connection *msc_con;
 static struct in_addr local_addr;
 static LLIST_HEAD(active_connections);
 static struct write_queue mgcp_agent;
+static const char *rf_ctl = NULL;
 extern int ipacc_rtp_direct;
 
 extern int bsc_bootstrap_network(int (*layer4)(struct gsm_network *, int, void *), const char *cfg_file);
@@ -890,6 +892,7 @@ static void print_help()
 	printf("  -m --msc=IP. The address of the MSC.\n");
 	printf("  -l --local=IP. The local address of the MGCP.\n");
 	printf("  -e --log-level number. Set a global loglevel.\n");
+	printf("  -r --rf-ctl NAME. A unix domain socket to listen for cmds.\n");
 }
 
 static void handle_options(int argc, char** argv)
@@ -905,10 +908,11 @@ static void handle_options(int argc, char** argv)
 			{"msc", 1, 0, 'm'},
 			{"local", 1, 0, 'l'},
 			{"log-level", 1, 0, 'e'},
+			{"rf-ctl", 1, 0, 'r'},
 			{0, 0, 0, 0}
 		};
 
-		c = getopt_long(argc, argv, "hd:sTc:m:l:e:",
+		c = getopt_long(argc, argv, "hd:sTc:m:l:e:r:",
 				long_options, &option_index);
 		if (c == -1)
 			break;
@@ -942,6 +946,9 @@ static void handle_options(int argc, char** argv)
 		case 'e':
 			log_set_log_level(stderr_target, atoi(optarg));
 			break;
+		case 'r':
+			rf_ctl = optarg;
+			break;
 		default:
 			/* ignore */
 			break;
@@ -1084,6 +1091,15 @@ int main(int argc, char **argv)
 		exit(1);
 	}
 
+	if (rf_ctl) {
+		struct bsc_msc_rf *rf;
+		rf = bsc_msc_rf_create(rf_ctl, bsc_gsmnet);
+		if (!rf) {
+			fprintf(stderr, "Failed to create the RF service.\n");
+			exit(1);
+		}
+	}
+
 	while (1) {
 		bsc_select_main(0);
 	}

openbsc/src/bsc_msc_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/bsc_msc_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 bsc_msc_rf_conn *conn)
+{
+	struct msgb *msg;
+	struct gsm_bts *bts;
+	char send = '0';
+
+	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 = '1';
+					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 bsc_msc_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 bsc_msc_rf_conn *conn;
+	struct bsc_msc_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 bsc_msc_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 bsc_msc_rf *bsc_msc_rf_create(const char *path, struct gsm_network *net)
+{
+	unsigned int namelen;
+	struct sockaddr_un local;
+	struct bsc_fd *bfd;
+	struct bsc_msc_rf *rf;
+	int rc;
+
+	rf = talloc_zero(NULL, struct bsc_msc_rf);
+	if (!rf) {
+		LOGP(DINP, LOGL_ERROR, "Failed to create bsc_msc_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;
+}
+