[gprs] Build the SGSN stand-alone and not as part of bsc_hack
Instead of continuing to add more and more functionality to the
bsc_hack binary, we should have the new SGSN code run as a separate
executable.
After this commit we now build a 'osmo_sgsn' executable, using its
own osmo_sgsn.cfg config file.
However, the SGSN is not yet functional, mainly due to the fact that
the BSSGP and GMM code are written with the assumption that there
is a msgb->trx->bts and the according 'sturct gsm_bts' data model
around - which clearly is no longer the case outside of bsc_hack.
diff --git a/openbsc/src/sgsn_main.c b/openbsc/src/sgsn_main.c
new file mode 100644
index 0000000..5c56ca7
--- /dev/null
+++ b/openbsc/src/sgsn_main.c
@@ -0,0 +1,141 @@
+/* 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 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 <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <getopt.h>
+#include <errno.h>
+#include <sys/fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <osmocore/talloc.h>
+#include <osmocore/select.h>
+
+#include <openbsc/signal.h>
+#include <openbsc/debug.h>
+#include <openbsc/telnet_interface.h>
+#include <openbsc/vty.h>
+#include <openbsc/sgsn.h>
+#include <openbsc/gprs_ns.h>
+#include <openbsc/gprs_bssgp.h>
+
+#include "../bscconfig.h"
+
+/* this is here for the vty... it will never be called */
+void subscr_put() { abort(); }
+
+#define _GNU_SOURCE
+#include <getopt.h>
+
+void *tall_bsc_ctx;
+
+struct gprs_ns_inst *sgsn_nsi;
+
+const char *openbsc_version = "Osmocom NSIP Proxy " PACKAGE_VERSION;
+const char *openbsc_copyright =
+ "Copyright (C) 2010 Harald Welte and On-Waves\n"
+ "Contributions by Daniel Willmann, Jan Lübbe, Stefan Schmidt\n"
+ "Dieter Spaar, Andreas Eversberg, Holger Freyther\n\n"
+ "License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>\n"
+ "This is free software: you are free to change and redistribute it.\n"
+ "There is NO WARRANTY, to the extent permitted by law.\n";
+
+static char *config_file = "osmo_sgsn.cfg";
+static struct sgsn_config sgcfg;
+
+/* call-back function for the NS protocol */
+static int sgsn_ns_cb(enum gprs_ns_evt event, struct gprs_nsvc *nsvc,
+ struct msgb *msg, u_int16_t bvci)
+{
+ int rc = 0;
+
+ switch (event) {
+ case GPRS_NS_EVT_UNIT_DATA:
+ /* hand the message into the BSSGP implementation */
+ rc = gprs_bssgp_rcvmsg(msg, bvci);
+ break;
+ default:
+ LOGP(DGPRS, LOGL_ERROR, "SGSN: Unknown event %u from NS\n", event);
+ if (msg)
+ talloc_free(msg);
+ rc = -EIO;
+ break;
+ }
+ return rc;
+}
+
+
+int main(int argc, char **argv)
+{
+ struct gsm_network dummy_network;
+ struct log_target *stderr_target;
+ struct sockaddr_in sin;
+ int rc;
+
+ tall_bsc_ctx = talloc_named_const(NULL, 0, "osmo_sgsn");
+
+ log_init(&log_info);
+ stderr_target = log_target_create_stderr();
+ log_add_target(stderr_target);
+ log_set_all_filter(stderr_target, 1);
+
+ telnet_init(&dummy_network, 4245);
+ rc = sgsn_parse_config(config_file, &sgcfg);
+ if (rc < 0) {
+ LOGP(DGPRS, LOGL_FATAL, "Cannot parse config file\n");
+ exit(2);
+ }
+
+ sgsn_nsi = gprs_ns_instantiate(&sgsn_ns_cb);
+ if (!sgsn_nsi) {
+ LOGP(DGPRS, LOGL_ERROR, "Unable to instantiate NS\n");
+ exit(1);
+ }
+ sgcfg.nsi = sgsn_nsi;
+ nsip_listen(sgsn_nsi, sgcfg.nsip_listen_port);
+
+ while (1) {
+ rc = bsc_select_main(0);
+ if (rc < 0)
+ exit(3);
+ }
+
+ exit(0);
+}
+
+struct gsm_network;
+int bsc_vty_init(struct gsm_network *dummy)
+{
+ cmd_init(1);
+ vty_init();
+
+ openbsc_vty_add_cmds();
+ sgsn_vty_init();
+ return 0;
+}
+