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strongswan/src/starter/starter.c

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/* strongSwan IPsec starter
* Copyright (C) 2001-2002 Mathieu Lafon - Arkoon Network Security
*
* 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.
*
* RCSID $Id: starter.c,v 1.23 2006/02/15 18:37:46 as Exp $
*/
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <stdio.h>
#include <signal.h>
#include <unistd.h>
#include <sys/time.h>
#include <time.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <freeswan.h>
#include "../pluto/constants.h"
#include "../pluto/defs.h"
#include "../pluto/log.h"
#include "confread.h"
#include "files.h"
#include "starterwhack.h"
#include "starterstroke.h"
#include "invokepluto.h"
#include "invokecharon.h"
#include "netkey.h"
#include "cmp.h"
#include "interfaces.h"
#define FLAG_ACTION_START_PLUTO 0x01
#define FLAG_ACTION_UPDATE 0x02
#define FLAG_ACTION_RELOAD 0x04
#define FLAG_ACTION_QUIT 0x08
#define FLAG_ACTION_LISTEN 0x10
#define FLAG_ACTION_START_CHARON 0x20
static unsigned int _action_ = 0;
static void
fsig(int signal)
{
switch (signal)
{
case SIGCHLD:
{
int status;
pid_t pid;
char *name = NULL;
while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
{
if (pid == starter_pluto_pid())
name = " (Pluto)";
if (pid == starter_charon_pid())
name = " (Charon)";
if (WIFSIGNALED(status))
DBG(DBG_CONTROL,
DBG_log("child %d%s has been killed by sig %d\n",
pid, name?name:"", WTERMSIG(status))
)
else if (WIFSTOPPED(status))
DBG(DBG_CONTROL,
DBG_log("child %d%s has been stopped by sig %d\n",
pid, name?name:"", WSTOPSIG(status))
)
else if (WIFEXITED(status))
DBG(DBG_CONTROL,
DBG_log("child %d%s has quit (exit code %d)\n",
pid, name?name:"", WEXITSTATUS(status))
)
else
DBG(DBG_CONTROL,
DBG_log("child %d%s has quit", pid, name?name:"")
)
if (pid == starter_pluto_pid())
starter_pluto_sigchild(pid);
if (pid == starter_charon_pid())
starter_charon_sigchild(pid);
}
}
break;
case SIGPIPE:
/** ignore **/
break;
case SIGALRM:
_action_ |= FLAG_ACTION_START_PLUTO;
_action_ |= FLAG_ACTION_START_CHARON;
break;
case SIGHUP:
_action_ |= FLAG_ACTION_UPDATE;
break;
case SIGTERM:
case SIGQUIT:
case SIGINT:
_action_ |= FLAG_ACTION_QUIT;
break;
case SIGUSR1:
_action_ |= FLAG_ACTION_RELOAD;
_action_ |= FLAG_ACTION_UPDATE;
break;
default:
plog("fsig(): unknown signal %d -- investigate", signal);
break;
}
}
static void
usage(char *name)
{
fprintf(stderr, "Usage: starter [--nofork] [--auto-update <sec>] "
"[--debug|--debug-more|--debug-all]\n");
exit(1);
}
int main (int argc, char **argv)
{
starter_config_t *cfg = NULL;
starter_config_t *new_cfg;
starter_conn_t *conn, *conn2;
starter_ca_t *ca, *ca2;
struct stat stb;
char *err = NULL;
int i;
int id = 1;
struct timeval tv;
unsigned long auto_update = 0;
time_t last_reload;
bool no_fork = FALSE;
/* global variables defined in log.h */
log_to_stderr = TRUE;
base_debugging = DBG_NONE;
/* parse command line */
for (i = 1; i < argc; i++)
{
if (streq(argv[i], "--debug"))
{
base_debugging |= DBG_CONTROL;
}
else if (streq(argv[i], "--debug-more"))
{
base_debugging |= DBG_CONTROLMORE;
}
else if (streq(argv[i], "--debug-all"))
{
base_debugging |= DBG_ALL;
}
else if (streq(argv[i], "--nofork"))
{
no_fork = TRUE;
}
else if (streq(argv[i], "--auto-update") && i+1 < argc)
{
auto_update = atoi(argv[++i]);
if (!auto_update)
usage(argv[0]);
}
else
{
usage(argv[0]);
}
}
/* Init */
init_log("ipsec_starter");
cur_debugging = base_debugging;
signal(SIGHUP, fsig);
signal(SIGCHLD, fsig);
signal(SIGPIPE, fsig);
signal(SIGINT, fsig);
signal(SIGTERM, fsig);
signal(SIGQUIT, fsig);
signal(SIGALRM, fsig);
signal(SIGUSR1, fsig);
plog("Starting strongSwan %s IPsec [starter]...", ipsec_version_code());
/* verify that we can start */
if (getuid() != 0)
{
plog("permission denied (must be superuser)");
exit(1);
}
if (stat(PLUTO_PID_FILE, &stb) == 0)
{
plog("pluto is already running (%s exists) -- skipping pluto start", PLUTO_PID_FILE);
}
else
{
_action_ |= FLAG_ACTION_START_PLUTO;
}
if (stat(CHARON_PID_FILE, &stb) == 0)
{
plog("charon is already running (%s exists) -- skipping charon start", CHARON_PID_FILE);
}
else
{
_action_ |= FLAG_ACTION_START_CHARON;
}
if (stat(DEV_RANDOM, &stb) != 0)
{
plog("unable to start strongSwan IPsec -- no %s!", DEV_RANDOM);
exit(1);
}
if (stat(DEV_URANDOM, &stb)!= 0)
{
plog("unable to start strongSwan IPsec -- no %s!", DEV_URANDOM);
exit(1);
}
cfg = confread_load(CONFIG_FILE);
if (!cfg)
{
plog("unable to start strongSwan -- errors in config");
exit(1);
}
/* determine if we have a native netkey IPsec stack */
if (!starter_netkey_init())
{
plog("nor netkey IPSec stack detected");
exit(1);
}
last_reload = time(NULL);
if (stat(STARTER_PID_FILE, &stb) == 0)
{
plog("starter is already running (%s exists) -- no fork done", STARTER_PID_FILE);
exit(0);
}
/* fork if we're not debugging stuff */
if (!no_fork)
{
log_to_stderr = FALSE;
switch (fork())
{
case 0:
{
int fnull = open("/dev/null", O_RDWR);
if (fnull >= 0)
{
dup2(fnull, STDIN_FILENO);
dup2(fnull, STDOUT_FILENO);
dup2(fnull, STDERR_FILENO);
close(fnull);
}
}
break;
case -1:
plog("can't fork: %s", strerror(errno));
break;
default:
exit(0);
}
}
/* save pid file in /var/run/starter.pid */
{
FILE *fd = fopen(STARTER_PID_FILE, "w");
if (fd)
{
fprintf(fd, "%u\n", getpid());
fclose(fd);
}
}
for (;;)
{
/*
* Stop pluto/charon (if started) and exit
*/
if (_action_ & FLAG_ACTION_QUIT)
{
if (starter_pluto_pid())
starter_stop_pluto();
if (starter_charon_pid())
starter_stop_charon();
starter_netkey_cleanup();
confread_free(cfg);
unlink(STARTER_PID_FILE);
unlink(INFO_FILE);
#ifdef LEAK_DETECTIVE
report_leaks();
#endif /* LEAK_DETECTIVE */
close_log();
plog("ipsec starter stopped");
exit(0);
}
/*
* Delete all connections. Will be added below
*/
if (_action_ & FLAG_ACTION_RELOAD)
{
if (starter_pluto_pid() || starter_charon_pid())
{
for (conn = cfg->conn_first; conn; conn = conn->next)
{
if (conn->state == STATE_ADDED)
{
if (starter_charon_pid())
{
starter_stroke_del_conn(conn);
}
if (starter_pluto_pid())
{
starter_whack_del_conn(conn);
}
conn->state = STATE_TO_ADD;
}
}
for (ca = cfg->ca_first; ca; ca = ca->next)
{
if (ca->state == STATE_ADDED)
{
if (starter_pluto_pid())
{
starter_whack_del_ca(ca);
ca->state = STATE_TO_ADD;
}
}
}
}
_action_ &= ~FLAG_ACTION_RELOAD;
}
/*
* Update configuration
*/
if (_action_ & FLAG_ACTION_UPDATE)
{
err = NULL;
DBG(DBG_CONTROL,
DBG_log("Reloading config...")
);
new_cfg = confread_load(CONFIG_FILE);
if (new_cfg)
{
/* Switch to new config. New conn will be loaded below */
if (!starter_cmp_defaultroute(&new_cfg->defaultroute
, &cfg->defaultroute))
{
_action_ |= FLAG_ACTION_LISTEN;
}
if (!starter_cmp_pluto(cfg, new_cfg))
{
plog("Pluto has changed");
if (starter_pluto_pid())
starter_stop_pluto();
_action_ &= ~FLAG_ACTION_LISTEN;
_action_ |= FLAG_ACTION_START_PLUTO;
}
else
{
/* Only reload conn and ca sections if pluto is not killed */
/* Look for new connections that are already loaded */
for (conn = cfg->conn_first; conn; conn = conn->next)
{
if (conn->state == STATE_ADDED)
{
for (conn2 = new_cfg->conn_first; conn2; conn2 = conn2->next)
{
if (conn2->state == STATE_TO_ADD && starter_cmp_conn(conn, conn2))
{
conn->state = STATE_REPLACED;
conn2->state = STATE_ADDED;
conn2->id = conn->id;
break;
}
}
}
}
/* Remove conn sections that have become unused */
for (conn = cfg->conn_first; conn; conn = conn->next)
{
if (conn->state == STATE_ADDED)
{
if (starter_charon_pid())
{
starter_stroke_del_conn(conn);
}
if (starter_pluto_pid())
{
starter_whack_del_conn(conn);
}
}
}
/* Look for new ca sections that are already loaded */
for (ca = cfg->ca_first; ca; ca = ca->next)
{
if (ca->state == STATE_ADDED)
{
for (ca2 = new_cfg->ca_first; ca2; ca2 = ca2->next)
{
if (ca2->state == STATE_TO_ADD && starter_cmp_ca(ca, ca2))
{
ca->state = STATE_REPLACED;
ca2->state = STATE_ADDED;
break;
}
}
}
}
/* Remove ca sections that have become unused */
for (ca = cfg->ca_first; ca; ca = ca->next)
{
if (ca->state == STATE_ADDED)
{
if (starter_pluto_pid())
{
starter_whack_del_ca(ca);
}
}
}
}
confread_free(cfg);
cfg = new_cfg;
}
else
{
plog("can't reload config file: %s -- keeping old one");
}
_action_ &= ~FLAG_ACTION_UPDATE;
last_reload = time(NULL);
}
/*
* Start pluto
*/
if (_action_ & FLAG_ACTION_START_PLUTO)
{
if (cfg->setup.plutostart && !starter_pluto_pid())
{
DBG(DBG_CONTROL,
DBG_log("Attempting to start pluto...")
);
if (starter_start_pluto(cfg, no_fork) == 0)
{
starter_whack_listen();
}
else
{
/* schedule next try */
alarm(PLUTO_RESTART_DELAY);
}
}
_action_ &= ~FLAG_ACTION_START_PLUTO;
for (ca = cfg->ca_first; ca; ca = ca->next)
{
if (ca->state == STATE_ADDED)
ca->state = STATE_TO_ADD;
}
for (conn = cfg->conn_first; conn; conn = conn->next)
{
if (conn->state == STATE_ADDED)
conn->state = STATE_TO_ADD;
}
}
/*
* Start charon
*/
if (_action_ & FLAG_ACTION_START_CHARON)
{
if (cfg->setup.charonstart && !starter_charon_pid())
{
DBG(DBG_CONTROL,
DBG_log("Attempting to start charon...")
);
if (starter_start_charon(cfg, no_fork))
{
/* schedule next try */
alarm(PLUTO_RESTART_DELAY);
}
}
_action_ &= ~FLAG_ACTION_START_CHARON;
}
/*
* Tell pluto to reread its interfaces
*/
if (_action_ & FLAG_ACTION_LISTEN)
{
if (starter_pluto_pid())
{
starter_whack_listen();
_action_ &= ~FLAG_ACTION_LISTEN;
}
}
/*
* Add stale conn and ca sections
*/
if (starter_pluto_pid() || starter_charon_pid())
{
for (ca = cfg->ca_first; ca; ca = ca->next)
{
if (ca->state == STATE_TO_ADD)
{
if (starter_pluto_pid())
{
starter_whack_add_ca(ca);
ca->state = STATE_ADDED;
}
}
}
for (conn = cfg->conn_first; conn; conn = conn->next)
{
if (conn->state == STATE_TO_ADD)
{
if (conn->id == 0)
{
/* affect new unique id */
conn->id = id++;
}
if (starter_charon_pid())
{
starter_stroke_add_conn(conn);
}
if (starter_pluto_pid())
{
starter_whack_add_conn(conn);
}
conn->state = STATE_ADDED;
if (conn->startup == STARTUP_START)
{
if (conn->keyexchange == KEY_EXCHANGE_IKEV2)
{
if (starter_charon_pid())
{
starter_stroke_initiate_conn(conn);
}
}
else
{
if (starter_pluto_pid())
{
starter_whack_initiate_conn(conn);
}
}
}
else if (conn->startup == STARTUP_ROUTE)
{
if (conn->keyexchange == KEY_EXCHANGE_IKEV2)
{
if (starter_charon_pid())
{
starter_stroke_route_conn(conn);
}
}
else
{
if (starter_pluto_pid())
{
starter_whack_route_conn(conn);
}
}
}
}
}
}
/*
* If auto_update activated, when to stop select
*/
if (auto_update)
{
time_t now = time(NULL);
tv.tv_sec = (now < last_reload + auto_update)
? (last_reload + auto_update-now) : 0;
tv.tv_usec = 0;
}
/*
* Wait for something to happen
*/
if (select(0, NULL, NULL, NULL, auto_update ? &tv : NULL) == 0)
{
/* timeout -> auto_update */
_action_ |= FLAG_ACTION_UPDATE;
}
}
return 0;
}
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