394 lines
9.8 KiB
C
394 lines
9.8 KiB
C
/* NS-over-IP proxy */
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/* (C) 2010 by Harald Welte <laforge@gnumonks.org>
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* (C) 2010 by On-Waves
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <getopt.h>
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#include <errno.h>
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#include <signal.h>
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#include <sys/fcntl.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <osmocom/core/application.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/select.h>
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#include <osmocom/core/rate_ctr.h>
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#include <osmocom/core/stats.h>
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#include <osmocom/gprs/gprs_ns.h>
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#include <osmocom/gprs/gprs_bssgp.h>
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#include <osmocom/sgsn/signal.h>
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#include <osmocom/sgsn/debug.h>
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#include <osmocom/sgsn/vty.h>
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#include <osmocom/sgsn/gb_proxy.h>
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#include <osmocom/ctrl/control_vty.h>
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#include <osmocom/ctrl/control_if.h>
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#include <osmocom/ctrl/ports.h>
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#include <osmocom/vty/command.h>
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#include <osmocom/vty/telnet_interface.h>
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#include <osmocom/vty/logging.h>
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#include <osmocom/vty/stats.h>
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#include <osmocom/vty/ports.h>
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#include <osmocom/vty/misc.h>
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#include "../../bscconfig.h"
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#define _GNU_SOURCE
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#include <getopt.h>
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void *tall_sgsn_ctx;
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const char *openbsc_copyright =
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"Copyright (C) 2010 Harald Welte and On-Waves\r\n"
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"License AGPLv3+: GNU AGPL version 3 or later <http://gnu.org/licenses/agpl-3.0.html>\r\n"
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"This is free software: you are free to change and redistribute it.\r\n"
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"There is NO WARRANTY, to the extent permitted by law.\r\n";
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#define CONFIG_FILE_DEFAULT "osmo-gbproxy.cfg"
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#define CONFIG_FILE_LEGACY "osmo_gbproxy.cfg"
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static char *config_file = NULL;
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struct gbproxy_config *gbcfg;
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static int daemonize = 0;
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/* Pointer to the SGSN peer */
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extern struct gbprox_peer *gbprox_peer_sgsn;
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/* call-back function for the NS protocol */
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static int proxy_ns_cb(enum gprs_ns_evt event, struct gprs_nsvc *nsvc,
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struct msgb *msg, uint16_t bvci)
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{
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int rc = 0;
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switch (event) {
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case GPRS_NS_EVT_UNIT_DATA:
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rc = gbprox_rcvmsg(gbcfg, msg, nsvc->nsei, bvci, nsvc->nsvci);
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break;
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default:
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LOGP(DGPRS, LOGL_ERROR, "SGSN: Unknown event %u from NS\n", event);
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if (msg)
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msgb_free(msg);
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rc = -EIO;
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break;
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}
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return rc;
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}
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static void signal_handler(int signal)
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{
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fprintf(stdout, "signal %u received\n", signal);
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switch (signal) {
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case SIGINT:
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case SIGTERM:
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osmo_signal_dispatch(SS_L_GLOBAL, S_L_GLOBAL_SHUTDOWN, NULL);
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sleep(1);
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exit(0);
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break;
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case SIGABRT:
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/* in case of abort, we want to obtain a talloc report
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* and then return to the caller, who will abort the process */
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case SIGUSR1:
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talloc_report(tall_vty_ctx, stderr);
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talloc_report_full(tall_sgsn_ctx, stderr);
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break;
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case SIGUSR2:
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talloc_report_full(tall_vty_ctx, stderr);
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break;
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default:
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break;
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}
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}
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static void print_usage()
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{
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printf("Usage: bsc_hack\n");
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}
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static void print_help()
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{
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printf(" Some useful help...\n");
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printf(" -h --help this text\n");
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printf(" -d option --debug=DNS:DGPRS,0:0 enable debugging\n");
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printf(" -D --daemonize Fork the process into a background daemon\n");
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printf(" -c --config-file filename The config file to use [%s]\n", CONFIG_FILE_DEFAULT);
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printf(" -s --disable-color\n");
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printf(" -T --timestamp Prefix every log line with a timestamp\n");
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printf(" -V --version. Print the version.\n");
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printf(" -e --log-level number. Set a global loglevel.\n");
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}
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static void handle_options(int argc, char **argv)
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{
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while (1) {
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int option_index = 0, c;
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static struct option long_options[] = {
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{ "help", 0, 0, 'h' },
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{ "debug", 1, 0, 'd' },
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{ "daemonize", 0, 0, 'D' },
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{ "config-file", 1, 0, 'c' },
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{ "disable-color", 0, 0, 's' },
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{ "timestamp", 0, 0, 'T' },
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{ "version", 0, 0, 'V' },
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{ "log-level", 1, 0, 'e' },
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{ 0, 0, 0, 0 }
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};
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c = getopt_long(argc, argv, "hd:Dc:sTVe:",
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long_options, &option_index);
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if (c == -1)
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break;
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switch (c) {
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case 'h':
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print_usage();
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print_help();
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exit(0);
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case 's':
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log_set_use_color(osmo_stderr_target, 0);
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break;
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case 'd':
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log_parse_category_mask(osmo_stderr_target, optarg);
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break;
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case 'D':
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daemonize = 1;
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break;
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case 'c':
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config_file = optarg;
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break;
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case 'T':
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log_set_print_timestamp(osmo_stderr_target, 1);
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break;
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case 'e':
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log_set_log_level(osmo_stderr_target, atoi(optarg));
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break;
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case 'V':
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print_version(1);
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exit(0);
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break;
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default:
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break;
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}
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}
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}
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int gbproxy_vty_is_config_node(struct vty *vty, int node)
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{
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switch (node) {
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/* add items that are not config */
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case CONFIG_NODE:
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return 0;
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default:
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return 1;
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}
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}
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int gbproxy_vty_go_parent(struct vty *vty)
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{
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switch (vty->node) {
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case GBPROXY_NODE:
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default:
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if (gbproxy_vty_is_config_node(vty, vty->node))
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vty->node = CONFIG_NODE;
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else
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vty->node = ENABLE_NODE;
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vty->index = NULL;
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}
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return vty->node;
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}
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static struct vty_app_info vty_info = {
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.name = "OsmoGbProxy",
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.version = PACKAGE_VERSION,
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.go_parent_cb = gbproxy_vty_go_parent,
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.is_config_node = gbproxy_vty_is_config_node,
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};
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/* default categories */
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static struct log_info_cat gprs_categories[] = {
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[DGPRS] = {
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.name = "DGPRS",
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.description = "GPRS Packet Service",
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.enabled = 1, .loglevel = LOGL_DEBUG,
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},
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[DNS] = {
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.name = "DNS",
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.description = "GPRS Network Service (NS)",
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.enabled = 1, .loglevel = LOGL_INFO,
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},
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[DBSSGP] = {
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.name = "DBSSGP",
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.description = "GPRS BSS Gateway Protocol (BSSGP)",
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.enabled = 1, .loglevel = LOGL_DEBUG,
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},
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};
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static const struct log_info gprs_log_info = {
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.filter_fn = gprs_log_filter_fn,
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.cat = gprs_categories,
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.num_cat = ARRAY_SIZE(gprs_categories),
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};
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static bool file_exists(const char *path)
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{
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struct stat sb;
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return stat(path, &sb) ? false : true;
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}
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int main(int argc, char **argv)
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{
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int rc;
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struct ctrl_handle *ctrl;
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tall_sgsn_ctx = talloc_named_const(NULL, 0, "nsip_proxy");
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msgb_talloc_ctx_init(tall_sgsn_ctx, 0);
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vty_info.tall_ctx = tall_sgsn_ctx;
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signal(SIGINT, &signal_handler);
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signal(SIGTERM, &signal_handler);
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signal(SIGABRT, &signal_handler);
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signal(SIGUSR1, &signal_handler);
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signal(SIGUSR2, &signal_handler);
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osmo_init_ignore_signals();
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osmo_init_logging2(tall_sgsn_ctx, &gprs_log_info);
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vty_info.copyright = openbsc_copyright;
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vty_init(&vty_info);
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logging_vty_add_cmds();
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osmo_talloc_vty_add_cmds();
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osmo_stats_vty_add_cmds();
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gbproxy_vty_init();
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handle_options(argc, argv);
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/* Backwards compatibility: for years, the default config file name was
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* osmo_gbproxy.cfg. All other Osmocom programs use osmo-*.cfg with a
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* dash. To be able to use the new config file name without breaking
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* previous setups that might rely on the legacy default config file
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* name, we need to look for the old config file if no -c option was
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* passed AND no file exists with the new default file name. */
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if (!config_file) {
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/* No -c option was passed */
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if (file_exists(CONFIG_FILE_LEGACY)
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&& !file_exists(CONFIG_FILE_DEFAULT))
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config_file = CONFIG_FILE_LEGACY;
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else
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config_file = CONFIG_FILE_DEFAULT;
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}
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rate_ctr_init(tall_sgsn_ctx);
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osmo_stats_init(tall_sgsn_ctx);
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bssgp_nsi = gprs_ns_instantiate(&proxy_ns_cb, tall_sgsn_ctx);
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if (!bssgp_nsi) {
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LOGP(DGPRS, LOGL_ERROR, "Unable to instantiate NS\n");
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exit(1);
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}
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gbcfg = talloc_zero(tall_sgsn_ctx, struct gbproxy_config);
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if (!gbcfg) {
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LOGP(DGPRS, LOGL_FATAL, "Unable to allocate config\n");
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exit(1);
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}
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gbproxy_init_config(gbcfg);
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gbcfg->nsi = bssgp_nsi;
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gprs_ns_vty_init(bssgp_nsi);
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gprs_ns_set_log_ss(DNS);
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bssgp_set_log_ss(DBSSGP);
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osmo_signal_register_handler(SS_L_NS, &gbprox_signal, gbcfg);
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rc = gbproxy_parse_config(config_file, gbcfg);
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if (rc < 0) {
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LOGP(DGPRS, LOGL_FATAL, "Cannot parse config file '%s'\n", config_file);
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exit(2);
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}
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/* start telnet after reading config for vty_get_bind_addr() */
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rc = telnet_init_dynif(tall_sgsn_ctx, NULL,
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vty_get_bind_addr(), OSMO_VTY_PORT_GBPROXY);
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if (rc < 0)
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exit(1);
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/* Start control interface after getting config for
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* ctrl_vty_get_bind_addr() */
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ctrl = ctrl_interface_setup_dynip(gbcfg, ctrl_vty_get_bind_addr(), OSMO_CTRL_PORT_GBPROXY, NULL);
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if (!ctrl) {
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LOGP(DGPRS, LOGL_FATAL, "Failed to create CTRL interface.\n");
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exit(1);
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}
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if (gb_ctrl_cmds_install() != 0) {
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LOGP(DGPRS, LOGL_FATAL, "Failed to install CTRL commands.\n");
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exit(1);
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}
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if (!gprs_nsvc_by_nsei(gbcfg->nsi, gbcfg->nsip_sgsn_nsei)) {
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LOGP(DGPRS, LOGL_FATAL, "You cannot proxy to NSEI %u "
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"without creating that NSEI before\n",
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gbcfg->nsip_sgsn_nsei);
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exit(2);
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}
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rc = gprs_ns_nsip_listen(bssgp_nsi);
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if (rc < 0) {
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LOGP(DGPRS, LOGL_FATAL, "Cannot bind/listen on NSIP socket\n");
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exit(2);
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}
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rc = gprs_ns_frgre_listen(bssgp_nsi);
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if (rc < 0) {
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LOGP(DGPRS, LOGL_FATAL, "Cannot bind/listen GRE "
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"socket. Do you have CAP_NET_RAW?\n");
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exit(2);
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}
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if (daemonize) {
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rc = osmo_daemonize();
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if (rc < 0) {
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perror("Error during daemonize");
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exit(1);
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}
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}
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/* Reset all the persistent NS-VCs that we've read from the config */
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gbprox_reset_persistent_nsvcs(bssgp_nsi);
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while (1) {
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rc = osmo_select_main(0);
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if (rc < 0)
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exit(3);
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}
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exit(0);
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}
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