Move out sgsn to its own subdir

Change-Id: I16fccc0eadf588599b9e5578d0f4dbaf9df81737

1 files changed, 536 insertions, 0 deletions

diff --git a/src/sgsn/sgsn_main.c b/src/sgsn/sgsn_main.c
new file mode 100644
index 000000000..eef5f8f22
--- /dev/null
+++ b/src/sgsn/sgsn_main.c
@@ -0,0 +1,536 @@
+/* GPRS SGSN Implementation */
+
+/* (C) 2010 by Harald Welte <laforge@gnumonks.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 <unistd.h>
+#include <stdio.h>
+#include <time.h>
+#include <stdlib.h>
+#include <string.h>
+#include <getopt.h>
+#include <errno.h>
+#include <signal.h>
+#include <sys/fcntl.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <osmocom/core/application.h>
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/select.h>
+#include <osmocom/core/rate_ctr.h>
+#include <osmocom/core/logging.h>
+#include <osmocom/core/stats.h>
+
+#include <osmocom/gprs/gprs_ns.h>
+#include <osmocom/gprs/gprs_bssgp.h>
+
+#include <osmocom/vty/telnet_interface.h>
+#include <osmocom/vty/logging.h>
+#include <osmocom/vty/stats.h>
+#include <osmocom/vty/ports.h>
+#include <osmocom/vty/misc.h>
+
+#include <osmocom/ctrl/control_vty.h>
+
+#include <osmocom/sgsn/signal.h>
+#include <osmocom/sgsn/debug.h>
+#include <osmocom/sgsn/vty.h>
+#include <osmocom/sgsn/sgsn.h>
+#include <osmocom/sgsn/gprs_llc.h>
+#include <osmocom/sgsn/gprs_gmm.h>
+#include <osmocom/sgsn/gprs_ranap.h>
+
+#include <osmocom/ctrl/control_if.h>
+#include <osmocom/ctrl/ports.h>
+
+#include <gtp.h>
+
+#include "../../bscconfig.h"
+
+#if BUILD_IU
+#include <osmocom/sigtran/osmo_ss7.h>
+#include <osmocom/sigtran/protocol/m3ua.h>
+#include <osmocom/ranap/iu_client.h>
+#endif
+
+#define _GNU_SOURCE
+#include <getopt.h>
+
+void *tall_sgsn_ctx;
+struct ctrl_handle *g_ctrlh;
+
+struct gprs_ns_inst *sgsn_nsi;
+static int daemonize = 0;
+const char *openbsc_copyright =
+	"Copyright (C) 2010 Harald Welte and On-Waves\r\n"
+	"License AGPLv3+: GNU AGPL version 3 or later <http://gnu.org/licenses/agpl-3.0.html>\r\n"
+	"This is free software: you are free to change and redistribute it.\r\n"
+	"There is NO WARRANTY, to the extent permitted by law.\r\n";
+
+#define CONFIG_FILE_DEFAULT "osmo-sgsn.cfg"
+#define CONFIG_FILE_LEGACY "osmo_sgsn.cfg"
+
+
+struct sgsn_instance *sgsn;
+
+/* call-back function for the NS protocol */
+static int sgsn_ns_cb(enum gprs_ns_evt event, struct gprs_nsvc *nsvc,
+		      struct msgb *msg, uint16_t bvci)
+{
+	int rc = 0;
+
+	switch (event) {
+	case GPRS_NS_EVT_UNIT_DATA:
+		/* hand the message into the BSSGP implementation */
+		rc = bssgp_rcvmsg(msg);
+		break;
+	default:
+		LOGP(DGPRS, LOGL_ERROR, "SGSN: Unknown event %u from NS\n", event);
+		if (msg)
+			msgb_free(msg);
+		rc = -EIO;
+		break;
+	}
+	return rc;
+}
+
+/* call-back function for the BSSGP protocol */
+int bssgp_prim_cb(struct osmo_prim_hdr *oph, void *ctx)
+{
+	struct osmo_bssgp_prim *bp;
+	bp = container_of(oph, struct osmo_bssgp_prim, oph);
+
+	switch (oph->sap) {
+	case SAP_BSSGP_LL:
+		switch (oph->primitive) {
+		case PRIM_BSSGP_UL_UD:
+			return gprs_llc_rcvmsg(oph->msg, bp->tp);
+		}
+		break;
+	case SAP_BSSGP_GMM:
+		switch (oph->primitive) {
+		case PRIM_BSSGP_GMM_SUSPEND:
+			return gprs_gmm_rx_suspend(bp->ra_id, bp->tlli);
+		case PRIM_BSSGP_GMM_RESUME:
+			return gprs_gmm_rx_resume(bp->ra_id, bp->tlli,
+						  bp->u.resume.suspend_ref);
+		}
+		break;
+	case SAP_BSSGP_NM:
+		break;
+	}
+	return 0;
+}
+
+static void signal_handler(int signal)
+{
+	fprintf(stdout, "signal %u received\n", signal);
+
+	switch (signal) {
+	case SIGINT:
+	case SIGTERM:
+		osmo_signal_dispatch(SS_L_GLOBAL, S_L_GLOBAL_SHUTDOWN, NULL);
+		sleep(1);
+		exit(0);
+		break;
+	case SIGABRT:
+		/* in case of abort, we want to obtain a talloc report
+		 * and then return to the caller, who will abort the process */
+	case SIGUSR1:
+		talloc_report(tall_vty_ctx, stderr);
+		talloc_report_full(tall_sgsn_ctx, stderr);
+		break;
+	case SIGUSR2:
+		talloc_report_full(tall_vty_ctx, stderr);
+		break;
+	default:
+		break;
+	}
+}
+
+/* NSI that BSSGP uses when transmitting on NS */
+extern struct gprs_ns_inst *bssgp_nsi;
+
+int sgsn_vty_is_config_node(struct vty *vty, int node)
+{
+	/* So far the SGSN has no nested nodes that need parent node
+	 * declaration, except for the ss7 vty nodes. */
+	switch (node) {
+	case SGSN_NODE:
+		return 1;
+	default:
+#if BUILD_IU
+		return osmo_ss7_is_config_node(vty, node);
+#else
+		return 0;
+#endif
+	}
+}
+
+int sgsn_vty_go_parent(struct vty *vty)
+{
+	/* So far the SGSN has no nested nodes that need parent node
+	 * declaration, except for the ss7 vty nodes. */
+#if BUILD_IU
+	return osmo_ss7_vty_go_parent(vty);
+#else
+	vty->node = CONFIG_NODE;
+	vty->index = NULL;
+	return 0;
+#endif
+}
+
+static struct vty_app_info vty_info = {
+	.name 		= "OsmoSGSN",
+	.version	= PACKAGE_VERSION,
+	.go_parent_cb	= sgsn_vty_go_parent,
+	.is_config_node	= sgsn_vty_is_config_node,
+};
+
+static void print_help(void)
+{
+	printf("Some useful help...\n");
+	printf("  -h --help\tthis text\n");
+	printf("  -V --version\tPrint the version\n");
+	printf("  -D --daemonize\tFork the process into a background daemon\n");
+	printf("  -d option --debug\tenable Debugging\n");
+	printf("  -s --disable-color\n");
+	printf("  -c --config-file\tThe config file to use [%s]\n", CONFIG_FILE_DEFAULT);
+	printf("  -e --log-level number\tSet a global log level\n");
+}
+
+static void handle_options(int argc, char **argv)
+{
+	while (1) {
+		int option_index = 0, c;
+		static struct option long_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'},
+			{NULL, 0, 0, 0}
+		};
+
+		c = getopt_long(argc, argv, "hd:Dc:sTVe:",
+				long_options, &option_index);
+		if (c == -1)
+			break;
+
+		switch (c) {
+		case 'h':
+			//print_usage();
+			print_help();
+			exit(0);
+		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':
+			osmo_talloc_replace_string(sgsn, &sgsn->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;
+		default:
+			/* ignore */
+			break;
+		}
+	}
+}
+
+/* default categories */
+static struct log_info_cat gprs_categories[] = {
+	[DMM] = {
+		.name = "DMM",
+		.description = "Layer3 Mobility Management (MM)",
+		.color = "\033[1;33m",
+		.enabled = 1, .loglevel = LOGL_NOTICE,
+	},
+	[DPAG]	= {
+		.name = "DPAG",
+		.description = "Paging Subsystem",
+		.color = "\033[1;38m",
+		.enabled = 1, .loglevel = LOGL_NOTICE,
+	},
+	[DMEAS] = {
+		.name = "DMEAS",
+		.description = "Radio Measurement Processing",
+		.enabled = 0, .loglevel = LOGL_NOTICE,
+	},
+	[DREF] = {
+		.name = "DREF",
+		.description = "Reference Counting",
+		.enabled = 0, .loglevel = LOGL_NOTICE,
+	},
+	[DGPRS] = {
+		.name = "DGPRS",
+		.description = "GPRS Packet Service",
+		.enabled = 1, .loglevel = LOGL_NOTICE,
+	},
+	[DNS] = {
+		.name = "DNS",
+		.description = "GPRS Network Service (NS)",
+		.enabled = 1, .loglevel = LOGL_NOTICE,
+	},
+	[DBSSGP] = {
+		.name = "DBSSGP",
+		.description = "GPRS BSS Gateway Protocol (BSSGP)",
+		.enabled = 1, .loglevel = LOGL_NOTICE,
+	},
+	[DLLC] = {
+		.name = "DLLC",
+		.description = "GPRS Logical Link Control Protocol (LLC)",
+		.enabled = 1, .loglevel = LOGL_NOTICE,
+	},
+	[DSNDCP] = {
+		.name = "DSNDCP",
+		.description = "GPRS Sub-Network Dependent Control Protocol (SNDCP)",
+		.enabled = 1, .loglevel = LOGL_NOTICE,
+	},
+	[DRANAP] = {
+		.name = "DRANAP",
+		.description = "RAN Application Part (RANAP)",
+		.enabled = 1, .loglevel = LOGL_NOTICE,
+	},
+	[DSUA] = {
+		.name = "DSUA",
+		.description = "SCCP User Adaptation (SUA)",
+		.enabled = 1, .loglevel = LOGL_NOTICE,
+	},
+	[DSLHC] = {
+		.name = "DSLHC",
+		.description = "RFC1144 TCP/IP Header compression (SLHC)",
+		.enabled = 1, .loglevel = LOGL_NOTICE,
+	},
+	[DV42BIS] = {
+		.name = "DV42BIS",
+		.description = "V.42bis data compression (SNDCP)",
+		.enabled = 1, .loglevel = LOGL_NOTICE,
+	},
+	[DGTP] = {
+		.name = "DGTP",
+		.description = "GPRS Tunnelling Protocol (GTP)",
+		.enabled = 1, .loglevel = LOGL_NOTICE,
+	},
+};
+
+static const struct log_info gprs_log_info = {
+	.filter_fn = gprs_log_filter_fn,
+	.cat = gprs_categories,
+	.num_cat = ARRAY_SIZE(gprs_categories),
+};
+
+static bool file_exists(const char *path)
+{
+	struct stat sb;
+	return stat(path, &sb) ? false : true;
+}
+
+int main(int argc, char **argv)
+{
+	int rc;
+#if BUILD_IU
+	struct osmo_sccp_instance *sccp;
+#endif
+
+	srand(time(NULL));
+	tall_sgsn_ctx = talloc_named_const(NULL, 0, "osmo_sgsn");
+	sgsn = sgsn_instance_alloc(tall_sgsn_ctx);
+	msgb_talloc_ctx_init(tall_sgsn_ctx, 0);
+	vty_info.tall_ctx = tall_sgsn_ctx;
+
+	signal(SIGINT, &signal_handler);
+	signal(SIGTERM, &signal_handler);
+	signal(SIGABRT, &signal_handler);
+	signal(SIGUSR1, &signal_handler);
+	signal(SIGUSR2, &signal_handler);
+
+	osmo_init_ignore_signals();
+	osmo_init_logging2(tall_sgsn_ctx, &gprs_log_info);
+	osmo_stats_init(tall_sgsn_ctx);
+
+	vty_info.copyright = openbsc_copyright;
+	vty_init(&vty_info);
+	logging_vty_add_cmds();
+	osmo_talloc_vty_add_cmds();
+	osmo_stats_vty_add_cmds();
+	sgsn_vty_init(&sgsn->cfg);
+	ctrl_vty_init(tall_sgsn_ctx);
+
+#if BUILD_IU
+	osmo_ss7_init();
+	osmo_ss7_vty_init_asp(tall_sgsn_ctx);
+	osmo_sccp_vty_init();
+#endif
+
+	handle_options(argc, argv);
+
+	/* Backwards compatibility: for years, the default config file name was
+	 * osmo_sgsn.cfg. All other Osmocom programs use osmo-*.cfg with a
+	 * dash. To be able to use the new config file name without breaking
+	 * previous setups that might rely on the legacy default config file
+	 * name, we need to look for the old config file if no -c option was
+	 * passed AND no file exists with the new default file name. */
+	if (!sgsn->config_file) {
+		/* No -c option was passed */
+		if (file_exists(CONFIG_FILE_LEGACY)
+		    && !file_exists(CONFIG_FILE_DEFAULT))
+			osmo_talloc_replace_string(sgsn, &sgsn->config_file, CONFIG_FILE_LEGACY);
+		else
+			osmo_talloc_replace_string(sgsn, &sgsn->config_file, CONFIG_FILE_DEFAULT);
+	}
+
+	rate_ctr_init(tall_sgsn_ctx);
+
+	gprs_ns_set_log_ss(DNS);
+	bssgp_set_log_ss(DBSSGP);
+
+	sgsn_nsi = gprs_ns_instantiate(&sgsn_ns_cb, tall_sgsn_ctx);
+	if (!sgsn_nsi) {
+		LOGP(DGPRS, LOGL_ERROR, "Unable to instantiate NS\n");
+		exit(1);
+	}
+	bssgp_nsi = sgsn->cfg.nsi = sgsn_nsi;
+
+	gprs_llc_init("/usr/local/lib/osmocom/crypt/");
+	sgsn_rate_ctr_init();
+	sgsn_inst_init(sgsn);
+
+	gprs_ns_vty_init(bssgp_nsi);
+	bssgp_vty_init();
+	gprs_llc_vty_init();
+	gprs_sndcp_vty_init();
+	sgsn_auth_init(sgsn);
+	sgsn_cdr_init(sgsn);
+	/* FIXME: register signal handler for SS_L_NS */
+
+	rc = sgsn_parse_config(sgsn->config_file);
+	if (rc < 0) {
+		LOGP(DGPRS, LOGL_FATAL, "Error in config file\n");
+		exit(2);
+	}
+
+	/* start telnet after reading config for vty_get_bind_addr() */
+	rc = telnet_init_dynif(tall_sgsn_ctx, NULL,
+			       vty_get_bind_addr(), OSMO_VTY_PORT_SGSN);
+	if (rc < 0)
+		exit(1);
+
+	/* start control interface after reading config for
+	 * ctrl_vty_get_bind_addr() */
+	g_ctrlh = ctrl_interface_setup_dynip(NULL, ctrl_vty_get_bind_addr(),
+				    OSMO_CTRL_PORT_SGSN, NULL);
+	if (!g_ctrlh) {
+		LOGP(DGPRS, LOGL_ERROR, "Failed to create CTRL interface.\n");
+		exit(1);
+	}
+
+	if (sgsn_ctrl_cmds_install() != 0) {
+		LOGP(DGPRS, LOGL_ERROR, "Failed to install CTRL commands.\n");
+		exit(1);
+	}
+
+
+	rc = sgsn_gtp_init(sgsn);
+	if (rc) {
+		LOGP(DGPRS, LOGL_FATAL, "Cannot bind/listen on GTP socket\n");
+		exit(2);
+	} else
+		LOGP(DGPRS, LOGL_NOTICE, "libGTP v%s initialized\n", gtp_version());
+
+	rc = gprs_subscr_init(sgsn);
+	if (rc < 0) {
+		LOGP(DGPRS, LOGL_FATAL, "Cannot set up subscriber management\n");
+		exit(2);
+	}
+
+	rc = gprs_ns_nsip_listen(sgsn_nsi);
+	if (rc < 0) {
+		LOGP(DGPRS, LOGL_FATAL, "Cannot bind/listen on NSIP socket\n");
+		exit(2);
+	}
+
+	rc = gprs_ns_frgre_listen(sgsn_nsi);
+	if (rc < 0) {
+		LOGP(DGPRS, LOGL_FATAL, "Cannot bind/listen GRE "
+			"socket. Do you have CAP_NET_RAW?\n");
+		exit(2);
+	}
+
+	if (sgsn->cfg.dynamic_lookup) {
+		if (sgsn_ares_init(sgsn) != 0) {
+			LOGP(DGPRS, LOGL_FATAL,
+				"Failed to initialize c-ares(%d)\n", rc);
+			exit(4);
+		}
+	}
+
+#if BUILD_IU
+	/* Note that these are mostly defaults and can be overriden from the VTY */
+	sccp = osmo_sccp_simple_client_on_ss7_id(tall_sgsn_ctx,
+						 sgsn->cfg.iu.cs7_instance,
+						 "OsmoSGSN",
+						 (23 << 3) + 4,
+						 OSMO_SS7_ASP_PROT_M3UA,
+						 0, NULL,
+						 0, "127.0.0.1");
+	if (!sccp) {
+		printf("Setting up SCCP client failed.\n");
+		return 8;
+	}
+
+	ranap_iu_init(tall_sgsn_ctx, DRANAP, "OsmoSGSN-IuPS", sccp, gsm0408_gprs_rcvmsg_iu, sgsn_ranap_iu_event);
+#endif
+
+	if (daemonize) {
+		rc = osmo_daemonize();
+		if (rc < 0) {
+			perror("Error during daemonize");
+			exit(1);
+		}
+	}
+
+	while (1) {
+		rc = osmo_select_main(0);
+		if (rc < 0)
+			exit(3);
+	}
+
+	/* not reached */
+	exit(0);
+}