merge bts-specific main function into common/main.c:bts_main()

This removes a lot of copy+paste duplication between different BTS
models.

1 files changed, 332 insertions, 0 deletions

diff --git a/src/common/main.c b/src/common/main.c
new file mode 100644
index 00000000..d9fa7786
--- /dev/null
+++ b/src/common/main.c
@@ -0,0 +1,332 @@
+/* Main program for Osmocom BTS */
+
+/* (C) 2011-2015 by Harald Welte <laforge@gnumonks.org>
+ *
+ * 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 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 <stdint.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <getopt.h>
+#include <limits.h>
+#include <sys/signal.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sched.h>
+
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/application.h>
+#include <osmocom/vty/telnet_interface.h>
+#include <osmocom/vty/logging.h>
+#include <osmocom/vty/ports.h>
+#include <osmocom/core/gsmtap_util.h>
+#include <osmocom/core/gsmtap.h>
+
+#include <osmo-bts/gsm_data.h>
+#include <osmo-bts/logging.h>
+#include <osmo-bts/abis.h>
+#include <osmo-bts/bts.h>
+#include <osmo-bts/vty.h>
+#include <osmo-bts/l1sap.h>
+#include <osmo-bts/bts_model.h>
+#include <osmo-bts/pcu_if.h>
+#include <osmo-bts/control_if.h>
+
+int quit = 0;
+static const char *config_file = "osmo-bts.cfg";
+static int daemonize = 0;
+static int rt_prio = -1;
+static int trx_num = 1;
+static char *gsmtap_ip = 0;
+
+static void print_help()
+{
+	printf( "Some useful options:\n"
+		"  -h	--help		this text\n"
+		"  -d	--debug MASK	Enable debugging (e.g. -d DRSL:DOML:DLAPDM)\n"
+		"  -D	--daemonize	For the process into a background daemon\n"
+		"  -c	--config-file 	Specify the filename of the config file\n"
+		"  -s	--disable-color	Don't use colors in stderr log output\n"
+		"  -T	--timestamp	Prefix every log line with a timestamp\n"
+		"  -V	--version	Print version information and exit\n"
+		"  -e 	--log-level	Set a global log-level\n"
+		"  -r	--realtime PRIO	Use SCHED_RR with the specified priority\n"
+		"  -i	--gsmtap-ip	The destination IP used for GSMTAP.\n"
+		"  -t	--trx-num	Set number of TRX (default=%d)\n",
+		trx_num
+		);
+	bts_model_print_help();
+}
+
+/* FIXME: finally get some option parsing code into libosmocore */
+static void handle_options(int argc, char **argv)
+{
+	char *argv_out[argc];
+	int argc_out = 0;
+
+	argv_out[argc_out++] = argv[0];
+
+	/* disable generation of error messages on encountering unknown
+	 * options */
+	opterr = 0;
+
+	while (1) {
+		int option_idx = 0, c;
+		static const struct option long_options[] = {
+			/* FIXME: all those are generic Osmocom app options */
+			{ "help", 0, 0, 'h' },
+			{ "debug", 1, 0, 'd' },
+			{ "daemonize", 0, 0, 'D' },
+			{ "config-file", 1, 0, 'c' },
+			{ "disable-color", 0, 0, 's' },
+			{ "timestamp", 0, 0, 'T' },
+			{ "version", 0, 0, 'V' },
+			{ "log-level", 1, 0, 'e' },
+			/* FIXME: generic BTS app options */
+			{ "gsmtap-ip", 1, 0, 'i' },
+			{ "trx-num", 1, 0, 't' },
+			{ "realtime", 1, 0, 'r' },
+			{ 0, 0, 0, 0 }
+		};
+
+		c = getopt_long(argc, argv, "-hc:d:Dc:sTVe:i:t:r:",
+				long_options, &option_idx);
+		if (c == -1)
+			break;
+
+		switch (c) {
+		case 'h':
+			print_help();
+			exit(0);
+			break;
+		case 's':
+			log_set_use_color(osmo_stderr_target, 0);
+			break;
+		case 'd':
+			log_parse_category_mask(osmo_stderr_target, optarg);
+			break;
+		case 'D':
+			daemonize = 1;
+			break;
+		case 'c':
+			config_file = optarg;
+			break;
+		case 'T':
+			log_set_print_timestamp(osmo_stderr_target, 1);
+			break;
+		case 'V':
+			print_version(1);
+			exit(0);
+			break;
+		case 'e':
+			log_set_log_level(osmo_stderr_target, atoi(optarg));
+			break;
+		case 'r':
+			rt_prio = atoi(optarg);
+			break;
+		case 'i':
+			gsmtap_ip = optarg;
+			break;
+		case 't':
+			trx_num = atoi(optarg);
+			if (trx_num < 1)
+				trx_num = 1;
+			break;
+		case '?':
+		case 1:
+			/* prepare argv[] for bts_model */
+			argv_out[argc_out++] = argv[optind-1];
+			break;
+		default:
+			break;
+		}
+	}
+
+	/* re-set opt-ind for new parsig round */
+	optind = 1;
+	/* enable error-checking for the following getopt call */
+	opterr = 1;
+	if (bts_model_handle_options(argc_out, argv_out)) {
+		print_help();
+		exit(1);
+	}
+}
+
+static struct gsm_bts *bts;
+
+static void signal_handler(int signal)
+{
+	fprintf(stderr, "signal %u received\n", signal);
+
+	switch (signal) {
+	case SIGINT:
+		//osmo_signal_dispatch(SS_GLOBAL, S_GLOBAL_SHUTDOWN, NULL);
+		if (!quit)
+			bts_shutdown(bts, "SIGINT");
+		quit++;
+		break;
+	case SIGABRT:
+	case SIGUSR1:
+	case SIGUSR2:
+		talloc_report_full(tall_bts_ctx, stderr);
+		break;
+	default:
+		break;
+	}
+}
+
+static int write_pid_file(char *procname)
+{
+	FILE *outf;
+	char tmp[PATH_MAX+1];
+
+	snprintf(tmp, sizeof(tmp)-1, "/var/run/%s.pid", procname);
+	tmp[PATH_MAX-1] = '\0';
+
+	outf = fopen(tmp, "w");
+	if (!outf)
+		return -1;
+
+	fprintf(outf, "%d\n", getpid());
+
+	fclose(outf);
+
+	return 0;
+}
+
+int bts_main(int argc, char **argv)
+{
+	struct gsm_bts_role_bts *btsb;
+	struct gsm_bts_trx *trx;
+	struct e1inp_line *line;
+	void *tall_msgb_ctx;
+	int rc, i;
+
+	printf("((*))\n  |\n / \\ OsmoBTS\n");
+
+	tall_bts_ctx = talloc_named_const(NULL, 1, "OsmoBTS context");
+	tall_msgb_ctx = talloc_pool(tall_bts_ctx, 100*1024);
+	msgb_set_talloc_ctx(tall_msgb_ctx);
+
+	bts_log_init(NULL);
+
+	handle_options(argc, argv);
+
+	bts = gsm_bts_alloc(tall_bts_ctx);
+	if (!bts) {
+		fprintf(stderr, "Failed to create BTS structure\n");
+		exit(1);
+	}
+	for (i = 1; i < trx_num; i++) {
+		trx = gsm_bts_trx_alloc(bts);
+		if (!trx) {
+			fprintf(stderr, "Failed to create TRX structure\n");
+			exit(1);
+		}
+	}
+	vty_init(&bts_vty_info);
+	e1inp_vty_init();
+	bts_vty_init(bts, &bts_log_info);
+
+	/* enable realtime priority for us */
+	if (rt_prio != -1) {
+		struct sched_param param;
+
+		memset(&param, 0, sizeof(param));
+		param.sched_priority = rt_prio;
+		rc = sched_setscheduler(getpid(), SCHED_RR, &param);
+		if (rc != 0) {
+			fprintf(stderr, "Setting SCHED_RR priority(%d) failed: %s\n",
+				param.sched_priority, strerror(errno));
+			exit(1);
+		}
+	}
+
+        if (gsmtap_ip) {
+		gsmtap = gsmtap_source_init(gsmtap_ip, GSMTAP_UDP_PORT, 1);
+		if (!gsmtap) {
+			fprintf(stderr, "Failed during gsmtap_init()\n");
+			exit(1);
+		}
+		gsmtap_source_add_sink(gsmtap);
+	}
+
+	if (bts_init(bts) < 0) {
+		fprintf(stderr, "unable to open bts\n");
+		exit(1);
+	}
+
+	abis_init(bts);
+
+	rc = vty_read_config_file(config_file, NULL);
+	if (rc < 0) {
+		fprintf(stderr, "Failed to parse the config file: '%s'\n",
+			config_file);
+		exit(1);
+	}
+
+	write_pid_file("osmo-bts");
+
+	bts_controlif_setup(bts);
+
+	rc = telnet_init(tall_bts_ctx, NULL, OSMO_VTY_PORT_BTS);
+	if (rc < 0) {
+		fprintf(stderr, "Error initializing telnet\n");
+		exit(1);
+	}
+
+	if (pcu_sock_init()) {
+		fprintf(stderr, "PCU L1 socket failed\n");
+		exit(1);
+	}
+
+	signal(SIGINT, &signal_handler);
+	//signal(SIGABRT, &signal_handler);
+	signal(SIGUSR1, &signal_handler);
+	signal(SIGUSR2, &signal_handler);
+	osmo_init_ignore_signals();
+
+	btsb = bts_role_bts(bts);
+	if (!btsb->bsc_oml_host) {
+		fprintf(stderr, "Cannot start BTS without knowing BSC OML IP\n");
+		exit(1);
+	}
+
+	line = abis_open(bts, btsb->bsc_oml_host, "sysmoBTS");
+	if (!line) {
+		fprintf(stderr, "unable to connect to BSC\n");
+		exit(2);
+	}
+
+	if (daemonize) {
+		rc = osmo_daemonize();
+		if (rc < 0) {
+			perror("Error during daemonize");
+			exit(1);
+		}
+	}
+
+	while (quit < 2) {
+		log_reset_context();
+		osmo_select_main(0);
+	}
+}