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tinc/src/tincd.c
Guus Sliepen 6396f42d74 Stricter checks for netname and node names. 
- Node names should not be empty.
- Net names should not contain slashes or start with a dot, because they are
  used in pathnames.
2012-08-01 16:51:59 +02:00

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/*
tincd.c -- the main file for tincd
Copyright (C) 1998-2005 Ivo Timmermans
2000-2012 Guus Sliepen <guus@tinc-vpn.org>
2008 Max Rijevski <maksuf@gmail.com>
2009 Michael Tokarev <mjt@tls.msk.ru>
2010 Julien Muchembled <jm@jmuchemb.eu>
2010 Timothy Redaelli <timothy@redaelli.eu>
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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "system.h"
/* Darwin (MacOS/X) needs the following definition... */
#ifndef _P1003_1B_VISIBLE
#define _P1003_1B_VISIBLE
#endif
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#include <openssl/rand.h>
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/evp.h>
#include <openssl/engine.h>
#ifdef HAVE_LZO
#include LZO1X_H
#endif
#ifndef HAVE_MINGW
#include <pwd.h>
#include <grp.h>
#include <time.h>
#endif
#include <getopt.h>
#include "conf.h"
#include "control.h"
#include "crypto.h"
#include "device.h"
#include "logger.h"
#include "net.h"
#include "netutl.h"
#include "process.h"
#include "protocol.h"
#include "utils.h"
#include "xalloc.h"
/* The name this program was run with. */
char *program_name = NULL;
/* If nonzero, display usage information and exit. */
static bool show_help = false;
/* If nonzero, print the version on standard output and exit. */
static bool show_version = false;
/* If nonzero, use null ciphers and skip all key exchanges. */
bool bypass_security = false;
/* If nonzero, disable swapping for this process. */
static bool do_mlock = false;
/* If nonzero, chroot to netdir after startup. */
static bool do_chroot = false;
/* If !NULL, do setuid to given user after startup */
static const char *switchuser = NULL;
/* If nonzero, write log entries to a separate file. */
bool use_logfile = false;
char *identname = NULL; /* program name for syslog */
char *logfilename = NULL; /* log file location */
char *pidfilename = NULL;
char **g_argv; /* a copy of the cmdline arguments */
static int status = 1;
static struct option const long_options[] = {
{"config", required_argument, NULL, 'c'},
{"net", required_argument, NULL, 'n'},
{"help", no_argument, NULL, 1},
{"version", no_argument, NULL, 2},
{"no-detach", no_argument, NULL, 'D'},
{"debug", optional_argument, NULL, 'd'},
{"bypass-security", no_argument, NULL, 3},
{"mlock", no_argument, NULL, 'L'},
{"chroot", no_argument, NULL, 'R'},
{"user", required_argument, NULL, 'U'},
{"logfile", optional_argument, NULL, 4},
{"pidfile", required_argument, NULL, 5},
{"option", required_argument, NULL, 'o'},
{NULL, 0, NULL, 0}
};
#ifdef HAVE_MINGW
static struct WSAData wsa_state;
CRITICAL_SECTION mutex;
int main2(int argc, char **argv);
#endif
static void usage(bool status) {
if(status)
fprintf(stderr, "Try `%s --help\' for more information.\n",
program_name);
else {
printf("Usage: %s [option]...\n\n", program_name);
printf( " -c, --config=DIR Read configuration options from DIR.\n"
" -D, --no-detach Don't fork and detach.\n"
" -d, --debug[=LEVEL] Increase debug level or set it to LEVEL.\n"
" -n, --net=NETNAME Connect to net NETNAME.\n"
" -L, --mlock Lock tinc into main memory.\n"
" --logfile[=FILENAME] Write log entries to a logfile.\n"
" --pidfile=FILENAME Write PID and control socket cookie to FILENAME.\n"
" --bypass-security Disables meta protocol security, for debugging.\n"
" -o, --option[HOST.]KEY=VALUE Set global/host configuration value.\n"
" -R, --chroot chroot to NET dir at startup.\n"
" -U, --user=USER setuid to given USER at startup.\n" " --help Display this help and exit.\n"
" --version Output version information and exit.\n\n");
printf("Report bugs to tinc@tinc-vpn.org.\n");
}
}
static bool parse_options(int argc, char **argv) {
config_t *cfg;
int r;
int option_index = 0;
int lineno = 0;
cmdline_conf = list_alloc((list_action_t)free_config);
while((r = getopt_long(argc, argv, "c:DLd::n:o:RU:", long_options, &option_index)) != EOF) {
switch (r) {
case 0: /* long option */
break;
case 'c': /* config file */
confbase = xstrdup(optarg);
break;
case 'D': /* no detach */
do_detach = false;
break;
case 'L': /* no detach */
#ifndef HAVE_MLOCKALL
logger(DEBUG_ALWAYS, LOG_ERR, "%s not supported on this platform", "mlockall()");
return false;
#else
do_mlock = true;
break;
#endif
case 'd': /* inc debug level */
if(optarg)
debug_level = atoi(optarg);
else
debug_level++;
break;
case 'n': /* net name given */
netname = xstrdup(optarg);
break;
case 'o': /* option */
cfg = parse_config_line(optarg, NULL, ++lineno);
if (!cfg)
return false;
list_insert_tail(cmdline_conf, cfg);
break;
case 'R': /* chroot to NETNAME dir */
do_chroot = true;
break;
case 'U': /* setuid to USER */
switchuser = optarg;
break;
case 1: /* show help */
show_help = true;
break;
case 2: /* show version */
show_version = true;
break;
case 3: /* bypass security */
bypass_security = true;
break;
case 4: /* write log entries to a file */
use_logfile = true;
if(optarg)
logfilename = xstrdup(optarg);
break;
case 5: /* open control socket here */
pidfilename = xstrdup(optarg);
break;
case '?':
usage(true);
return false;
default:
break;
}
}
if(!netname && (netname = getenv("NETNAME")))
netname = xstrdup(netname);
/* netname "." is special: a "top-level name" */
if(netname && (!*netname || !strcmp(netname, "."))) {
free(netname);
netname = NULL;
}
if(netname && (strpbrk(netname, "\\/") || *netname == '.')) {
fprintf(stderr, "Invalid character in netname!\n");
return false;
}
return true;
}
/*
Set all files and paths according to netname
*/
static void make_names(void) {
#ifdef HAVE_MINGW
HKEY key;
char installdir[1024] = "";
long len = sizeof installdir;
#endif
if(netname)
xasprintf(&identname, "tinc.%s", netname);
else
identname = xstrdup("tinc");
#ifdef HAVE_MINGW
if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
if(!logfilename)
xasprintf(&logfilename, "%s" SLASH "log" SLASH "%s.log", identname);
if(!confbase) {
if(netname)
xasprintf(&confbase, "%s" SLASH "%s", installdir, netname);
else
xasprintf(&confbase, "%s", installdir);
}
if(!pidfilename)
xasprintf(&pidfilename, "%s" SLASH "pid", confbase);
}
RegCloseKey(key);
if(*installdir)
return;
}
#endif
if(!logfilename)
xasprintf(&logfilename, LOCALSTATEDIR SLASH "log" SLASH "%s.log", identname);
if(!pidfilename)
xasprintf(&pidfilename, LOCALSTATEDIR SLASH "run" SLASH "%s.pid", identname);
if(netname) {
if(!confbase)
xasprintf(&confbase, CONFDIR SLASH "tinc" SLASH "%s", netname);
else
logger(DEBUG_ALWAYS, LOG_INFO, "Both netname and configuration directory given, using the latter...");
} else {
if(!confbase)
xasprintf(&confbase, CONFDIR SLASH "tinc");
}
}
static void free_names(void) {
if (identname) free(identname);
if (netname) free(netname);
if (pidfilename) free(pidfilename);
if (logfilename) free(logfilename);
if (confbase) free(confbase);
}
static bool drop_privs(void) {
#ifdef HAVE_MINGW
if (switchuser) {
logger(DEBUG_ALWAYS, LOG_ERR, "%s not supported on this platform", "-U");
return false;
}
if (do_chroot) {
logger(DEBUG_ALWAYS, LOG_ERR, "%s not supported on this platform", "-R");
return false;
}
#else
uid_t uid = 0;
if (switchuser) {
struct passwd *pw = getpwnam(switchuser);
if (!pw) {
logger(DEBUG_ALWAYS, LOG_ERR, "unknown user `%s'", switchuser);
return false;
}
uid = pw->pw_uid;
if (initgroups(switchuser, pw->pw_gid) != 0 ||
setgid(pw->pw_gid) != 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
"initgroups", strerror(errno));
return false;
}
endgrent();
endpwent();
}
if (do_chroot) {
tzset(); /* for proper timestamps in logs */
if (chroot(confbase) != 0 || chdir("/") != 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
"chroot", strerror(errno));
return false;
}
free(confbase);
confbase = xstrdup("");
}
if (switchuser)
if (setuid(uid) != 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
"setuid", strerror(errno));
return false;
}
#endif
return true;
}
#ifdef HAVE_MINGW
# define setpriority(level) !SetPriorityClass(GetCurrentProcess(), (level))
#else
# define NORMAL_PRIORITY_CLASS 0
# define BELOW_NORMAL_PRIORITY_CLASS 10
# define HIGH_PRIORITY_CLASS -10
# define setpriority(level) (setpriority(PRIO_PROCESS, 0, (level)))
#endif
int main(int argc, char **argv) {
program_name = argv[0];
if(!parse_options(argc, argv))
return 1;
make_names();
if(show_version) {
printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
VERSION, __DATE__, __TIME__, PROT_MAJOR, PROT_MINOR);
printf("Copyright (C) 1998-2012 Ivo Timmermans, Guus Sliepen and others.\n"
"See the AUTHORS file for a complete list.\n\n"
"tinc comes with ABSOLUTELY NO WARRANTY. This is free software,\n"
"and you are welcome to redistribute it under certain conditions;\n"
"see the file COPYING for details.\n");
return 0;
}
if(show_help) {
usage(false);
return 0;
}
#ifdef HAVE_MINGW
if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
return 1;
}
#endif
openlogger("tinc", use_logfile?LOGMODE_FILE:LOGMODE_STDERR);
g_argv = argv;
if(getenv("LISTEN_PID") && atoi(getenv("LISTEN_PID")) == getpid())
do_detach = false;
#ifdef HAVE_UNSETENV
unsetenv("LISTEN_PID");
#endif
init_configuration(&config_tree);
/* Slllluuuuuuurrrrp! */
srand(time(NULL));
crypto_init();
if(!read_server_config())
return 1;
#ifdef HAVE_LZO
if(lzo_init() != LZO_E_OK) {
logger(DEBUG_ALWAYS, LOG_ERR, "Error initializing LZO compressor!");
return 1;
}
#endif
#ifdef HAVE_MINGW
if(!do_detach || !init_service())
return main2(argc, argv);
else
return 1;
}
int main2(int argc, char **argv) {
InitializeCriticalSection(&mutex);
EnterCriticalSection(&mutex);
#endif
char *priority = NULL;
if(!detach())
return 1;
#ifdef HAVE_MLOCKALL
/* Lock all pages into memory if requested.
* This has to be done after daemon()/fork() so it works for child.
* No need to do that in parent as it's very short-lived. */
if(do_mlock && mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "mlockall",
strerror(errno));
return 1;
}
#endif
if(!event_init()) {
logger(DEBUG_ALWAYS, LOG_ERR, "Error initializing libevent!");
return 1;
}
/* Setup sockets and open device. */
if(!setup_network())
goto end_nonet;
if(!init_control())
goto end_nonet;
/* Initiate all outgoing connections. */
try_outgoing_connections();
/* Change process priority */
if(get_config_string(lookup_config(config_tree, "ProcessPriority"), &priority)) {
if(!strcasecmp(priority, "Normal")) {
if (setpriority(NORMAL_PRIORITY_CLASS) != 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
"setpriority", strerror(errno));
goto end;
}
} else if(!strcasecmp(priority, "Low")) {
if (setpriority(BELOW_NORMAL_PRIORITY_CLASS) != 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
"setpriority", strerror(errno));
goto end;
}
} else if(!strcasecmp(priority, "High")) {
if (setpriority(HIGH_PRIORITY_CLASS) != 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s",
"setpriority", strerror(errno));
goto end;
}
} else {
logger(DEBUG_ALWAYS, LOG_ERR, "Invalid priority `%s`!", priority);
goto end;
}
}
/* drop privileges */
if (!drop_privs())
goto end;
/* Start main loop. It only exits when tinc is killed. */
status = main_loop();
/* Shutdown properly. */
if(debug_level >= DEBUG_CONNECTIONS)
devops.dump_stats();
close_network_connections();
end:
exit_control();
end_nonet:
logger(DEBUG_ALWAYS, LOG_NOTICE, "Terminating");
free(priority);
crypto_exit();
exit_configuration(&config_tree);
free(cmdline_conf);
free_names();
return status;
}
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