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/* strongSwan charon launcher
* Copyright (C) 2001-2002 Mathieu Lafon - Arkoon Network Security
* Copyright (C) 2006 Martin Willi - Hochschule fuer Technik Rapperswil
*
* Ported from invokepluto.c to fit charons needs.
*
* 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 <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <signal.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <library.h>
#include <debug.h>
#include "confread.h"
#include "invokecharon.h"
#include "files.h"
static int _charon_pid = 0;
static int _stop_requested;
pid_t starter_charon_pid(void)
{
return _charon_pid;
}
void starter_charon_sigchild(pid_t pid, int status)
{
if (pid == _charon_pid)
{
_charon_pid = 0;
if (status == SS_RC_LIBSTRONGSWAN_INTEGRITY ||
status == SS_RC_DAEMON_INTEGRITY)
{
DBG1(DBG_APP, "charon has quit: integrity test of %s failed",
(status == 64) ? "libstrongswan" : "charon");
_stop_requested = 1;
}
else if (status == SS_RC_INITIALIZATION_FAILED)
{
DBG1(DBG_APP, "charon has quit: initialization failed");
_stop_requested = 1;
}
if (!_stop_requested)
{
DBG1(DBG_APP, "charon has died -- restart scheduled (%dsec)",
CHARON_RESTART_DELAY);
alarm(CHARON_RESTART_DELAY); // restart in 5 sec
}
unlink(CHARON_PID_FILE);
}
}
int starter_stop_charon (void)
{
int i;
pid_t pid = _charon_pid;
if (pid)
{
_stop_requested = 1;
/* be more and more aggressive */
for (i = 0; i < 50 && (pid = _charon_pid) != 0; i++)
{
if (i == 0)
{
kill(pid, SIGINT);
}
else if (i < 40)
{
kill(pid, SIGTERM);
}
else if (i == 40)
{
kill(pid, SIGKILL);
DBG1(DBG_APP, "starter_stop_charon(): charon does not respond, sending KILL");
}
else
{
kill(pid, SIGKILL);
}
usleep(200000); /* sleep for 200 ms */
}
if (_charon_pid == 0)
{
DBG1(DBG_APP, "charon stopped after %d ms", 200*i);
return 0;
}
DBG1(DBG_APP, "starter_stop_charon(): can't stop charon !!!");
return -1;
}
else
{
DBG1(DBG_APP, "stater_stop_charon(): charon was not started...");
}
return -1;
}
int starter_start_charon (starter_config_t *cfg, bool no_fork, bool attach_gdb)
{
struct stat stb;
int pid, i;
char buffer[BUF_LEN];
int argc = 1;
char *arg[] = {
CHARON_CMD, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
};
if (attach_gdb)
{
argc = 0;
arg[argc++] = "/usr/bin/gdb";
arg[argc++] = "--args";
arg[argc++] = CHARON_CMD;
}
if (!no_fork)
{
arg[argc++] = "--use-syslog";
}
/* parse debug string */
{
int level;
char type[4];
char *pos = cfg->setup.charondebug;
char *buf_pos = buffer;
while (pos && sscanf(pos, "%3s %d,", type, &level) == 2)
{
snprintf(buf_pos, buffer + sizeof(buffer) - buf_pos, "--debug-%s", type);
arg[argc++] = buf_pos;
buf_pos += strlen(buf_pos) + 1;
if (buf_pos >= buffer + sizeof(buffer))
{
break;
}
snprintf(buf_pos, buffer + sizeof(buffer) - buf_pos, "%d", level);
arg[argc++] = buf_pos;
buf_pos += strlen(buf_pos) + 1;
if (buf_pos >= buffer + sizeof(buffer))
{
break;
}
/* get next */
pos = strchr(pos, ',');
if (pos)
{
pos++;
}
}
}
if (_charon_pid)
{
DBG1(DBG_APP, "starter_start_charon(): charon already started...");
return -1;
}
else
{
unlink(CHARON_CTL_FILE);
_stop_requested = 0;
pid = fork();
switch (pid)
{
case -1:
DBG1(DBG_APP, "can't fork(): %s", strerror(errno));
return -1;
case 0:
/* child */
setsid();
closefrom(3);
sigprocmask(SIG_SETMASK, 0, NULL);
/* disable glibc's malloc checker, conflicts with leak detective */
setenv("MALLOC_CHECK_", "0", 1);
execv(arg[0], arg);
DBG1(DBG_APP, "can't execv(%s,...): %s", arg[0], strerror(errno));
exit(1);
default:
/* father */
_charon_pid = pid;
for (i = 0; i < 500 && _charon_pid; i++)
{
/* wait for charon for a maximum of 500 x 20 ms = 10 s */
usleep(20000);
if (stat(CHARON_PID_FILE, &stb) == 0)
{
DBG1(DBG_APP, "charon (%d) started after %d ms",
_charon_pid, 20*(i+1));
return 0;
}
}
if (_charon_pid)
{
/* If charon is started but with no ctl file, stop it */
DBG1(DBG_APP, "charon too long to start... - kill kill");
for (i = 0; i < 20 && (pid = _charon_pid) != 0; i++)
{
if (i == 0)
{
kill(pid, SIGINT);
}
else if (i < 10)
{
kill(pid, SIGTERM);
}
else
{
kill(pid, SIGKILL);
}
usleep(20000); /* sleep for 20 ms */
}
}
else
{
DBG1(DBG_APP, "charon refused to be started");
}
return -1;
}
}
return -1;
}
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