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tinc/src/tincctl.c
Guus Sliepen 01f47c46af Start of control socket implementation.
2007-05-18 16:52:34 +00:00

337 lines
8.2 KiB
C
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/*
tincctl.c -- Controlling a running tincd
Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
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., 675 Mass Ave, Cambridge, MA 02139, USA.
$Id$
*/
#include "system.h"
#include <sys/un.h>
#include <openssl/rand.h>
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/evp.h>
#include <openssl/engine.h>
#include <getopt.h>
#include "conf.h"
#include "protocol.h"
#include "xalloc.h"
/* The name this program was run with. */
char *program_name = NULL;
/* If nonzero, display usage information and exit. */
bool show_help = false;
/* If nonzero, print the version on standard output and exit. */
bool show_version = false;
/* If nonzero, it will attempt to kill a running tincd and exit. */
int kill_tincd = 0;
/* If nonzero, generate public/private keypair for this host/net. */
int generate_keys = 0;
char *identname = NULL; /* program name for syslog */
char *pidfilename = NULL; /* pid file location */
char *controlfilename = NULL; /* pid file location */
char *confbase = NULL;
char *netname = NULL;
static int status;
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},
{"pidfile", required_argument, NULL, 5},
{NULL, 0, NULL, 0}
};
static void usage(bool status) {
if(status)
fprintf(stderr, _("Try `%s --help\' for more information.\n"),
program_name);
else {
printf(_("Usage: %s [options] command\n\n"), program_name);
printf(_("Valid options are:\n"
" -c, --config=DIR Read configuration options from DIR.\n"
" -n, --net=NETNAME Connect to net NETNAME.\n"
" --pidfile=FILENAME Write PID to FILENAME.\n"
" --help Display this help and exit.\n"
" --version Output version information and exit.\n"
"Valid commands are:\n"
" start Start tincd.\n"
" stop Stop tincd.\n"
" restart Restart tincd.\n"
" reload Reload configuration of running tincd.\n"
" genkey [bits] Generate a new public/private keypair.\n"
" dump Dump a list of one of the following things:\n"
" nodes - all known nodes in the VPN\n"
" edges - all known connections in the VPN\n"
" subnets - all known subnets in the VPN\n"
" connections - all meta connections with ourself\n"
" graph - graph of the VPN in dotty format\n"
"\n"));
printf(_("Report bugs to tinc@tinc-vpn.org.\n"));
}
}
static bool parse_options(int argc, char **argv) {
int r;
int option_index = 0;
while((r = getopt_long(argc, argv, "c:n:", long_options, &option_index)) != EOF) {
switch (r) {
case 0: /* long option */
break;
case 'c': /* config file */
confbase = xstrdup(optarg);
break;
case 'n': /* net name given */
netname = xstrdup(optarg);
break;
case 1: /* show help */
show_help = true;
break;
case 2: /* show version */
show_version = true;
break;
case 5: /* write PID to a file */
pidfilename = xstrdup(optarg);
break;
case '?':
usage(true);
return false;
default:
break;
}
}
return true;
}
/* This function prettyprints the key generation process */
static void indicator(int a, int b, void *p) {
switch (a) {
case 0:
fprintf(stderr, ".");
break;
case 1:
fprintf(stderr, "+");
break;
case 2:
fprintf(stderr, "-");
break;
case 3:
switch (b) {
case 0:
fprintf(stderr, " p\n");
break;
case 1:
fprintf(stderr, " q\n");
break;
default:
fprintf(stderr, "?");
}
break;
default:
fprintf(stderr, "?");
}
}
/*
Generate a public/private RSA keypair, and ask for a file to store
them in.
*/
static bool keygen(int bits) {
RSA *rsa_key;
FILE *f;
char *name = NULL;
char *filename;
fprintf(stderr, _("Generating %d bits keys:\n"), bits);
rsa_key = RSA_generate_key(bits, 0x10001, indicator, NULL);
if(!rsa_key) {
fprintf(stderr, _("Error during key generation!\n"));
return false;
} else
fprintf(stderr, _("Done.\n"));
asprintf(&filename, "%s/rsa_key.priv", confbase);
f = ask_and_open(filename, _("private RSA key"), "a");
if(!f)
return false;
#ifdef HAVE_FCHMOD
/* Make it unreadable for others. */
fchmod(fileno(f), 0600);
#endif
if(ftell(f))
fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
fclose(f);
free(filename);
if(name)
asprintf(&filename, "%s/hosts/%s", confbase, name);
else
asprintf(&filename, "%s/rsa_key.pub", confbase);
f = ask_and_open(filename, _("public RSA key"), "a");
if(!f)
return false;
if(ftell(f))
fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
PEM_write_RSAPublicKey(f, rsa_key);
fclose(f);
free(filename);
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)
asprintf(&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)
asprintf(&logfilename, "%s/log/%s.log", identname);
if(!confbase) {
if(netname)
asprintf(&confbase, "%s/%s", installdir, netname);
else
asprintf(&confbase, "%s", installdir);
}
}
RegCloseKey(key);
if(*installdir)
return;
}
#endif
if(!pidfilename)
asprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
asprintf(&controlfilename, LOCALSTATEDIR "/run/%s.control", identname);
if(netname) {
if(!confbase)
asprintf(&confbase, CONFDIR "/tinc/%s", netname);
else
fprintf(stderr, _("Both netname and configuration directory given, using the latter...\n"));
} else {
if(!confbase)
asprintf(&confbase, CONFDIR "/tinc");
}
}
int main(int argc, char **argv) {
int fd;
struct sockaddr_un addr;
program_name = argv[0];
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
if(!parse_options(argc, argv))
return 1;
make_names();
if(show_version) {
printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE,
VERSION, __DATE__, __TIME__, PROT_CURRENT);
printf(_("Copyright (C) 1998-2007 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;
}
if(strlen(controlfilename) >= sizeof addr.sun_path) {
fprintf(stderr, _("Control socket filename too long!\n"));
return 1;
}
fd = socket(PF_UNIX, SOCK_STREAM, 0);
if(fd < 0) {
fprintf(stderr, _("Cannot create UNIX socket: %s\n"), strerror(errno));
return 1;
}
memset(&addr, 0, sizeof addr);
addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, controlfilename, sizeof addr.sun_path - 1);
if(connect(fd, (struct sockaddr *)&addr, sizeof addr) < 0) {
fprintf(stderr, _("Cannot connect to %s: %s\n"), controlfilename, strerror(errno));
return 1;
}
printf("Connected to %s.\n", controlfilename);
close(fd);
return 0;
}
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