Osmocom Packet control Unit (PCU): Network-side GPRS (RLC/MAC); BTS- or BSC-colocated https://osmocom.org/projects/osmopcu
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/* pcu_main.cpp
*
* Copyright (C) 2012 Ivan Klyuchnikov
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <pcu_l1_if.h>
#include <gprs_rlcmac.h>
#include <gprs_debug.h>
#include <unistd.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <getopt.h>
#include <signal.h>
#include <sched.h>
#include <bts.h>
#include <osmocom/pcu/pcuif_proto.h>
#include "gprs_bssgp_pcu.h"
extern "C" {
#include "pcu_vty.h"
#include "coding_scheme.h"
#include <osmocom/gprs/gprs_bssgp.h>
#include <osmocom/gprs/gprs_ns2.h>
#include <osmocom/vty/telnet_interface.h>
#include <osmocom/vty/command.h>
#include <osmocom/vty/vty.h>
#include <osmocom/vty/ports.h>
#include <osmocom/vty/logging.h>
#include <osmocom/vty/cpu_sched_vty.h>
#include <osmocom/core/rate_ctr.h>
#include <osmocom/core/select.h>
#include <osmocom/core/application.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/stats.h>
#include <osmocom/core/gsmtap.h>
#include <osmocom/core/gsmtap_util.h>
}
extern struct gprs_nsvc *nsvc;
uint16_t spoof_mcc = 0, spoof_mnc = 0;
bool spoof_mnc_3_digits = false;
static int config_given = 0;
static char *config_file = strdup("osmo-pcu.cfg");
extern struct vty_app_info pcu_vty_info;
void *tall_pcu_ctx = NULL;
extern void *bv_tall_ctx;
static int quit = 0;
static int rt_prio = -1;
static bool daemonize = false;
static const char *gsmtap_addr;
static void print_help()
{
printf( "Some useful options:\n"
" -h --help This text\n"
" -c --config-file Specify the filename of the config file\n"
" -m --mcc MCC Use given MCC instead of value provided by BTS\n"
" -n --mnc MNC Use given MNC instead of value provided by BTS\n"
" -V --version Print version\n"
" -D --daemonize Fork the process into a background daemon\n"
"\nVTY reference generation:\n"
" --vty-ref-mode MODE VTY reference generation mode (e.g. 'expert').\n"
" --vty-ref-xml Generate the VTY reference XML output and exit.\n"
);
}
static void handle_long_options(const char *prog_name, const int long_option)
{
static int vty_ref_mode = VTY_REF_GEN_MODE_DEFAULT;
switch (long_option) {
case 1:
vty_ref_mode = get_string_value(vty_ref_gen_mode_names, optarg);
if (vty_ref_mode < 0) {
fprintf(stderr, "%s: Unknown VTY reference generation "
"mode '%s'\n", prog_name, optarg);
exit(2);
}
break;
case 2:
fprintf(stderr, "Generating the VTY reference in mode '%s' (%s)\n",
get_value_string(vty_ref_gen_mode_names, vty_ref_mode),
get_value_string(vty_ref_gen_mode_desc, vty_ref_mode));
vty_dump_xml_ref_mode(stdout, (enum vty_ref_gen_mode) vty_ref_mode);
exit(0);
default:
fprintf(stderr, "%s: error parsing cmdline options\n", prog_name);
exit(2);
}
}
/* FIXME: finally get some option parsing code into libosmocore */
static void handle_options(int argc, char **argv)
{
while (1) {
int option_idx = 0, c;
static int long_option = 0;
static const struct option long_options[] = {
{ "help", 0, 0, 'h' },
{ "config-file", 1, 0, 'c' },
{ "mcc", 1, 0, 'm' },
{ "mnc", 1, 0, 'n' },
{ "version", 0, 0, 'V' },
{ "realtime", 1, 0, 'r' },
{ "daemonize", 0, 0, 'D' },
{ "exit", 0, 0, 'e' },
{ "gsmtap-ip", 1, 0, 'i' },
{ "vty-ref-mode", 1, &long_option, 1 },
{ "vty-ref-xml", 0, &long_option, 2 },
{ 0, 0, 0, 0 }
};
c = getopt_long(argc, argv, "hc:m:n:Vr:De:i:",
long_options, &option_idx);
if (c == -1)
break;
switch (c) {
case 'h':
print_help();
exit(0);
break;
case 0:
handle_long_options(argv[0], long_option);
break;
case 'c':
free(config_file);
config_file = strdup(optarg);
config_given = 1;
break;
case 'm':
spoof_mcc = atoi(optarg);
break;
case 'n':
if (osmo_mnc_from_str(optarg, &spoof_mnc, &spoof_mnc_3_digits)) {
fprintf(stderr, "Error decoding MNC '%s'\n", optarg);
exit(1);
}
break;
case 'V':
print_version(1);
exit(0);
break;
case 'i':
gsmtap_addr = optarg;
fprintf(stderr, "Command line argument '-i' is deprecated, use VTY "
"parameter 'gsmtap-remote-host %s' instead.\n", gsmtap_addr);
break;
case 'r':
rt_prio = atoi(optarg);
fprintf(stderr, "Command line argument '-r' is deprecated, use VTY "
"cpu-sched node setting 'policy rr %d' instead.\n", rt_prio);
break;
case 'D':
daemonize = true;
break;
case 'e':
fprintf(stderr, "Warning: Option '-e' is deprecated!\n");
break;
default:
fprintf(stderr, "Unknown option '%c'\n", c);
exit(0);
break;
}
}
}
void sighandler(int sigset)
{
if (sigset == SIGPIPE)
return;
fprintf(stderr, "Signal %d received.\n", sigset);
switch (sigset) {
case SIGINT:
case SIGTERM:
/* If another signal is received afterwards, the program
* is terminated without finishing shutdown process.
*/
signal(SIGINT, SIG_DFL);
signal(SIGTERM, SIG_DFL);
signal(SIGPIPE, SIG_DFL);
signal(SIGABRT, SIG_DFL);
signal(SIGUSR1, SIG_DFL);
signal(SIGUSR2, SIG_DFL);
quit = 1;
break;
case SIGABRT:
/* in case of abort, we want to obtain a talloc report and
* then run default SIGABRT handler, who will generate coredump
* and abort the process. abort() should do this for us after we
* return, but program wouldn't exit if an external SIGABRT is
* received.
*/
talloc_report_full(tall_pcu_ctx, stderr);
signal(SIGABRT, SIG_DFL);
raise(SIGABRT);
break;
case SIGUSR1:
case SIGUSR2:
talloc_report_full(tall_pcu_ctx, stderr);
break;
}
}
int main(int argc, char *argv[])
{
struct sched_param param;
struct gprs_pcu *pcu;
int rc;
/* tall_pcu_ctx may already have been initialized in bts.cpp during early_init(). */
if (!tall_pcu_ctx) {
tall_pcu_ctx = talloc_named_const(NULL, 1, "Osmo-PCU context");
if (!tall_pcu_ctx)
return -ENOMEM;
osmo_init_logging2(tall_pcu_ctx, &gprs_log_info);
}
pcu = gprs_pcu_alloc(tall_pcu_ctx);
the_pcu = pcu; /* globally avaialable object */
pcu->pcu_sock_path = talloc_strdup(tall_pcu_ctx, PCU_SOCK_DEFAULT);
msgb_talloc_ctx_init(tall_pcu_ctx, 0);
osmo_stats_init(tall_pcu_ctx);
rate_ctr_init(tall_pcu_ctx);
pcu_vty_info.tall_ctx = tall_pcu_ctx;
vty_init(&pcu_vty_info);
pcu_vty_init();
osmo_cpu_sched_vty_init(tall_pcu_ctx);
logging_vty_add_deprecated_subsys(tall_pcu_ctx, "bssgp");
handle_options(argc, argv);
if ((!!spoof_mcc) + (!!spoof_mnc) == 1) {
fprintf(stderr, "--mcc and --mnc must be specified "
"together.\n");
exit(0);
}
pcu->nsi = gprs_ns2_instantiate(tall_pcu_ctx, gprs_ns_prim_cb, NULL);
if (!pcu->nsi) {
LOGP(DBSSGP, LOGL_ERROR, "Failed to create NS instance\n");
exit(1);
}
bssgp_set_bssgp_callback(gprs_gp_send_cb, pcu->nsi);
gprs_ns2_vty_init(pcu->nsi);
rc = vty_read_config_file(config_file, NULL);
if (rc < 0 && config_given) {
fprintf(stderr, "Failed to parse the config file: '%s'\n",
config_file);
exit(1);
}
if (rc < 0)
fprintf(stderr, "No config file: '%s' Using default config.\n",
config_file);
/* Accept a GSMTAP host from VTY config, but a commandline option overrides that. */
if (gsmtap_addr) {
if (pcu->gsmtap_remote_host != NULL) {
LOGP(DLGLOBAL, LOGL_NOTICE,
"Command line argument '-i %s' overrides "
"'gsmtap-remote-host %s' from the config file\n",
gsmtap_addr, pcu->gsmtap_remote_host);
talloc_free(pcu->gsmtap_remote_host);
}
pcu->gsmtap_remote_host = talloc_strdup(pcu, gsmtap_addr);
}
if (pcu->gsmtap_remote_host) {
LOGP(DLGLOBAL, LOGL_NOTICE,
"Setting up GSMTAP Um forwarding to '%s:%u'\n",
pcu->gsmtap_remote_host, GSMTAP_UDP_PORT);
pcu->gsmtap = gsmtap_source_init(pcu->gsmtap_remote_host,
GSMTAP_UDP_PORT, 1);
if (pcu->gsmtap == NULL) {
fprintf(stderr, "Failed during gsmtap_source_init()\n");
exit(1);
}
gsmtap_source_add_sink(pcu->gsmtap);
}
rc = telnet_init_dynif(tall_pcu_ctx, NULL, vty_get_bind_addr(),
OSMO_VTY_PORT_PCU);
if (rc < 0) {
fprintf(stderr, "Error initializing telnet\n");
exit(1);
}
if (!pcu->alloc_algorithm)
pcu->alloc_algorithm = alloc_algorithm_dynamic;
rc = pcu_l1if_open();
if (rc < 0)
return rc;
signal(SIGINT, sighandler);
signal(SIGTERM, sighandler);
signal(SIGPIPE, sighandler);
signal(SIGABRT, sighandler);
signal(SIGUSR1, sighandler);
signal(SIGUSR2, sighandler);
osmo_init_ignore_signals();
/* enable realtime priority for us */
if (rt_prio != -1) {
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 (daemonize) {
rc = osmo_daemonize();
if (rc < 0) {
perror("Error during daemonize");
exit(1);
}
}
while (!quit) {
osmo_select_main(0);
}
telnet_exit();
pcu_l1if_close();
TALLOC_FREE(the_pcu);
talloc_report_full(tall_pcu_ctx, stderr);
talloc_free(tall_pcu_ctx);
return 0;
}