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/*
* Copyright (C) 2012 Tobias Brunner
* HSR Hochschule fuer Technik Rapperswil
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#include <stdio.h>
#include <syslog.h>
#include <signal.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <daemon.h>
#include <library.h>
#include <utils/backtrace.h>
#include <threading/thread.h>
#include <nm/nm_backend.h>
/**
* Default user and group
*/
#ifndef IPSEC_USER
#define IPSEC_USER NULL
#endif
#ifndef IPSEC_GROUP
#define IPSEC_GROUP NULL
#endif
/**
* Hook in library for debugging messages
*/
extern void (*dbg) (debug_t group, level_t level, char *fmt, ...);
/**
* Simple logging hook for library logs, using syslog output
*/
static void dbg_syslog(debug_t group, level_t level, char *fmt, ...)
{
if (level <= 1)
{
char buffer[8192], groupstr[4];
va_list args;
va_start(args, fmt);
/* write in memory buffer first */
vsnprintf(buffer, sizeof(buffer), fmt, args);
/* cache group name */
snprintf(groupstr, sizeof(groupstr), "%N", debug_names, group);
syslog(LOG_DAEMON|LOG_INFO, "00[%s] %s", groupstr, buffer);
va_end(args);
}
}
/**
* Run the daemon and handle unix signals
*/
static void run()
{
sigset_t set;
/* handle SIGINT and SIGTERM in this handler */
sigemptyset(&set);
sigaddset(&set, SIGINT);
sigaddset(&set, SIGTERM);
sigprocmask(SIG_BLOCK, &set, NULL);
while (TRUE)
{
int sig;
sig = sigwaitinfo(&set, NULL);
if (sig == -1)
{
if (errno == EINTR)
{ /* ignore signals we didn't wait for */
continue;
}
DBG1(DBG_DMN, "waiting for signal failed: %s", strerror(errno));
return;
}
switch (sig)
{
case SIGINT:
{
DBG1(DBG_DMN, "signal of type SIGINT received. Shutting down");
charon->bus->alert(charon->bus, ALERT_SHUTDOWN_SIGNAL, sig);
return;
}
case SIGTERM:
{
DBG1(DBG_DMN, "signal of type SIGTERM received. Shutting down");
charon->bus->alert(charon->bus, ALERT_SHUTDOWN_SIGNAL, sig);
return;
}
}
}
}
/**
* Handle SIGSEGV/SIGILL signals raised by threads
*/
static void segv_handler(int signal)
{
backtrace_t *backtrace;
DBG1(DBG_DMN, "thread %u received %d", thread_current_id(), signal);
backtrace = backtrace_create(2);
backtrace->log(backtrace, stderr, TRUE);
backtrace->destroy(backtrace);
DBG1(DBG_DMN, "killing ourself, received critical signal");
abort();
}
/**
* Lookup UID and GID
*/
static bool lookup_uid_gid()
{
char *name;
name = lib->settings->get_str(lib->settings, "charon-nm.user",
IPSEC_USER);
if (name && !lib->caps->resolve_uid(lib->caps, name))
{
return FALSE;
}
name = lib->settings->get_str(lib->settings, "charon-nm.group",
IPSEC_GROUP);
if (name && !lib->caps->resolve_gid(lib->caps, name))
{
return FALSE;
}
return TRUE;
}
/**
* Main function, starts NetworkManager backend.
*/
int main(int argc, char *argv[])
{
struct sigaction action;
int status = SS_RC_INITIALIZATION_FAILED;
/* logging for library during initialization, as we have no bus yet */
dbg = dbg_syslog;
/* LD causes a crash probably due to Glib */
setenv("LEAK_DETECTIVE_DISABLE", "1", 1);
/* initialize library */
if (!library_init(NULL, "charon-nm"))
{
library_deinit();
exit(SS_RC_LIBSTRONGSWAN_INTEGRITY);
}
if (lib->integrity &&
!lib->integrity->check_file(lib->integrity, "charon-nm", argv[0]))
{
dbg_syslog(DBG_DMN, 1, "integrity check of charon-nm failed");
library_deinit();
exit(SS_RC_DAEMON_INTEGRITY);
}
if (!libcharon_init())
{
dbg_syslog(DBG_DMN, 1, "initialization failed - aborting charon-nm");
goto deinit;
}
if (!lookup_uid_gid())
{
dbg_syslog(DBG_DMN, 1, "invalid uid/gid - aborting charon-nm");
goto deinit;
}
/* make sure we log to the DAEMON facility by default */
lib->settings->set_int(lib->settings, "charon-nm.syslog.daemon.default",
lib->settings->get_int(lib->settings,
"charon-nm.syslog.daemon.default", 1));
charon->load_loggers(charon);
/* use random ports to avoid conflicts with regular charon */
lib->settings->set_int(lib->settings, "charon-nm.port", 0);
lib->settings->set_int(lib->settings, "charon-nm.port_nat_t", 0);
DBG1(DBG_DMN, "Starting charon NetworkManager backend (strongSwan "VERSION")");
if (lib->integrity)
{
DBG1(DBG_DMN, "integrity tests enabled:");
DBG1(DBG_DMN, "lib 'libstrongswan': passed file and segment integrity tests");
DBG1(DBG_DMN, "lib 'libcharon': passed file and segment integrity tests");
DBG1(DBG_DMN, "daemon 'charon-nm': passed file integrity test");
}
/* register NM backend to be loaded with plugins */
nm_backend_register();
/* initialize daemon */
if (!charon->initialize(charon,
lib->settings->get_str(lib->settings, "charon-nm.load", PLUGINS)))
{
DBG1(DBG_DMN, "initialization failed - aborting charon-nm");
goto deinit;
}
lib->plugins->status(lib->plugins, LEVEL_CTRL);
if (!lib->caps->drop(lib->caps))
{
DBG1(DBG_DMN, "capability dropping failed - aborting charon-nm");
goto deinit;
}
/* add handler for SEGV and ILL,
* INT and TERM are handled by sigwaitinfo() in run() */
action.sa_handler = segv_handler;
action.sa_flags = 0;
sigemptyset(&action.sa_mask);
sigaddset(&action.sa_mask, SIGINT);
sigaddset(&action.sa_mask, SIGTERM);
sigaction(SIGSEGV, &action, NULL);
sigaction(SIGILL, &action, NULL);
sigaction(SIGBUS, &action, NULL);
action.sa_handler = SIG_IGN;
sigaction(SIGPIPE, &action, NULL);
pthread_sigmask(SIG_SETMASK, &action.sa_mask, NULL);
/* start daemon (i.e. the threads in the thread-pool) */
charon->start(charon);
/* main thread goes to run loop */
run();
status = 0;
deinit:
libcharon_deinit();
library_deinit();
return status;
}
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