tinc-vpn.org Git - tinc/blob - src/tincctl.c

   1 /*
   2     tincctl.c -- Controlling a running tincd
   3     Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program; if not, write to the Free Software
  17     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18
  19     $Id$
  20 */
  21
  22 #include "system.h"
  23
  24 #include <sys/un.h>
  25 #include <openssl/rand.h>
  26 #include <openssl/rsa.h>
  27 #include <openssl/pem.h>
  28 #include <openssl/evp.h>
  29 #include <openssl/engine.h>
  30
  31 #include <getopt.h>
  32
  33 #include "conf.h"
  34 #include "protocol.h"
  35 #include "xalloc.h"
  36
  37 /* The name this program was run with. */
  38 char *program_name = NULL;
  39
  40 /* If nonzero, display usage information and exit. */
  41 bool show_help = false;
  42
  43 /* If nonzero, print the version on standard output and exit.  */
  44 bool show_version = false;
  45
  46 /* If nonzero, it will attempt to kill a running tincd and exit. */
  47 int kill_tincd = 0;
  48
  49 /* If nonzero, generate public/private keypair for this host/net. */
  50 int generate_keys = 0;
  51
  52 char *identname = NULL;                         /* program name for syslog */
  53 char *pidfilename = NULL;                       /* pid file location */
  54 char *controlfilename = NULL;                   /* pid file location */
  55 char *confbase = NULL;
  56 char *netname = NULL;
  57
  58 static int status;
  59
  60 static struct option const long_options[] = {
  61         {"config", required_argument, NULL, 'c'},
  62         {"net", required_argument, NULL, 'n'},
  63         {"help", no_argument, NULL, 1},
  64         {"version", no_argument, NULL, 2},
  65         {"pidfile", required_argument, NULL, 5},
  66         {NULL, 0, NULL, 0}
  67 };
  68
  69 static void usage(bool status) {
  70         if(status)
  71                 fprintf(stderr, _("Try `%s --help\' for more information.\n"),
  72                                 program_name);
  73         else {
  74                 printf(_("Usage: %s [options] command\n\n"), program_name);
  75                 printf(_("Valid options are:\n"
  76                                 "  -c, --config=DIR           Read configuration options from DIR.\n"
  77                                 "  -n, --net=NETNAME          Connect to net NETNAME.\n"
  78                                 "      --pidfile=FILENAME     Write PID to FILENAME.\n"
  79                                 "      --help                 Display this help and exit.\n"
  80                                 "      --version              Output version information and exit.\n"
  81                                 "Valid commands are:\n"
  82                                 "  start                      Start tincd.\n"
  83                                 "  stop                       Stop tincd.\n"
  84                                 "  restart                    Restart tincd.\n"
  85                                 "  reload                     Reload configuration of running tincd.\n"
  86                                 "  genkey [bits]              Generate a new public/private keypair.\n"
  87                                 "  dump                       Dump a list of one of the following things:\n"
  88                                 "    nodes                    - all known nodes in the VPN\n"
  89                                 "    edges                    - all known connections in the VPN\n"
  90                                 "    subnets                  - all known subnets in the VPN\n"
  91                                 "    connections              - all meta connections with ourself\n"
  92                                 "    graph                    - graph of the VPN in dotty format\n"
  93                                 "\n"));
  94                 printf(_("Report bugs to tinc@tinc-vpn.org.\n"));
  95         }
  96 }
  97
  98 static bool parse_options(int argc, char **argv) {
  99         int r;
 100         int option_index = 0;
 101
 102         while((r = getopt_long(argc, argv, "c:n:", long_options, &option_index)) != EOF) {
 103                 switch (r) {
 104                         case 0:                         /* long option */
 105                                 break;
 106
 107                         case 'c':                               /* config file */
 108                                 confbase = xstrdup(optarg);
 109                                 break;
 110
 111                         case 'n':                               /* net name given */
 112                                 netname = xstrdup(optarg);
 113                                 break;
 114
 115                         case 1:                                 /* show help */
 116                                 show_help = true;
 117                                 break;
 118
 119                         case 2:                                 /* show version */
 120                                 show_version = true;
 121                                 break;
 122
 123                         case 5:                                 /* write PID to a file */
 124                                 pidfilename = xstrdup(optarg);
 125                                 break;
 126
 127                         case '?':
 128                                 usage(true);
 129                                 return false;
 130
 131                         default:
 132                                 break;
 133                 }
 134         }
 135
 136         return true;
 137 }
 138
 139 /* This function prettyprints the key generation process */
 140
 141 static void indicator(int a, int b, void *p) {
 142         switch (a) {
 143                 case 0:
 144                         fprintf(stderr, ".");
 145                         break;
 146
 147                 case 1:
 148                         fprintf(stderr, "+");
 149                         break;
 150
 151                 case 2:
 152                         fprintf(stderr, "-");
 153                         break;
 154
 155                 case 3:
 156                         switch (b) {
 157                                 case 0:
 158                                         fprintf(stderr, " p\n");
 159                                         break;
 160
 161                                 case 1:
 162                                         fprintf(stderr, " q\n");
 163                                         break;
 164
 165                                 default:
 166                                         fprintf(stderr, "?");
 167                         }
 168                         break;
 169
 170                 default:
 171                         fprintf(stderr, "?");
 172         }
 173 }
 174
 175 /*
 176   Generate a public/private RSA keypair, and ask for a file to store
 177   them in.
 178 */
 179 static bool keygen(int bits) {
 180         RSA *rsa_key;
 181         FILE *f;
 182         char *name = NULL;
 183         char *filename;
 184
 185         fprintf(stderr, _("Generating %d bits keys:\n"), bits);
 186         rsa_key = RSA_generate_key(bits, 0x10001, indicator, NULL);
 187
 188         if(!rsa_key) {
 189                 fprintf(stderr, _("Error during key generation!\n"));
 190                 return false;
 191         } else
 192                 fprintf(stderr, _("Done.\n"));
 193
 194         asprintf(&filename, "%s/rsa_key.priv", confbase);
 195         f = ask_and_open(filename, _("private RSA key"), "a");
 196
 197         if(!f)
 198                 return false;
 199
 200 #ifdef HAVE_FCHMOD
 201         /* Make it unreadable for others. */
 202         fchmod(fileno(f), 0600);
 203 #endif
 204
 205         if(ftell(f))
 206                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 207
 208         PEM_write_RSAPrivateKey(f, rsa_key, NULL, NULL, 0, NULL, NULL);
 209         fclose(f);
 210         free(filename);
 211
 212         if(name)
 213                 asprintf(&filename, "%s/hosts/%s", confbase, name);
 214         else
 215                 asprintf(&filename, "%s/rsa_key.pub", confbase);
 216
 217         f = ask_and_open(filename, _("public RSA key"), "a");
 218
 219         if(!f)
 220                 return false;
 221
 222         if(ftell(f))
 223                 fprintf(stderr, _("Appending key to existing contents.\nMake sure only one key is stored in the file.\n"));
 224
 225         PEM_write_RSAPublicKey(f, rsa_key);
 226         fclose(f);
 227         free(filename);
 228
 229         return true;
 230 }
 231
 232 /*
 233   Set all files and paths according to netname
 234 */
 235 static void make_names(void) {
 236 #ifdef HAVE_MINGW
 237         HKEY key;
 238         char installdir[1024] = "";
 239         long len = sizeof(installdir);
 240 #endif
 241
 242         if(netname)
 243                 asprintf(&identname, "tinc.%s", netname);
 244         else
 245                 identname = xstrdup("tinc");
 246
 247 #ifdef HAVE_MINGW
 248         if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
 249                 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
 250                         if(!logfilename)
 251                                 asprintf(&logfilename, "%s/log/%s.log", identname);
 252                         if(!confbase) {
 253                                 if(netname)
 254                                         asprintf(&confbase, "%s/%s", installdir, netname);
 255                                 else
 256                                         asprintf(&confbase, "%s", installdir);
 257                         }
 258                 }
 259                 RegCloseKey(key);
 260                 if(*installdir)
 261                         return;
 262         }
 263 #endif
 264
 265         if(!pidfilename)
 266                 asprintf(&pidfilename, LOCALSTATEDIR "/run/%s.pid", identname);
 267
 268         asprintf(&controlfilename, LOCALSTATEDIR "/run/%s.control", identname);
 269
 270         if(netname) {
 271                 if(!confbase)
 272                         asprintf(&confbase, CONFDIR "/tinc/%s", netname);
 273                 else
 274                         fprintf(stderr, _("Both netname and configuration directory given, using the latter...\n"));
 275         } else {
 276                 if(!confbase)
 277                         asprintf(&confbase, CONFDIR "/tinc");
 278         }
 279 }
 280
 281 int main(int argc, char **argv) {
 282         int fd;
 283         struct sockaddr_un addr;
 284         program_name = argv[0];
 285
 286         setlocale(LC_ALL, "");
 287         bindtextdomain(PACKAGE, LOCALEDIR);
 288         textdomain(PACKAGE);
 289
 290         if(!parse_options(argc, argv))
 291                 return 1;
 292
 293         make_names();
 294
 295         if(show_version) {
 296                 printf(_("%s version %s (built %s %s, protocol %d)\n"), PACKAGE,
 297                            VERSION, __DATE__, __TIME__, PROT_CURRENT);
 298                 printf(_("Copyright (C) 1998-2007 Ivo Timmermans, Guus Sliepen and others.\n"
 299                                 "See the AUTHORS file for a complete list.\n\n"
 300                                 "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
 301                                 "and you are welcome to redistribute it under certain conditions;\n"
 302                                 "see the file COPYING for details.\n"));
 303
 304                 return 0;
 305         }
 306
 307         if(show_help) {
 308                 usage(false);
 309                 return 0;
 310         }
 311
 312         if(strlen(controlfilename) >= sizeof addr.sun_path) {
 313                 fprintf(stderr, _("Control socket filename too long!\n"));
 314                 return 1;
 315         }
 316
 317         fd = socket(PF_UNIX, SOCK_STREAM, 0);
 318         if(fd < 0) {
 319                 fprintf(stderr, _("Cannot create UNIX socket: %s\n"), strerror(errno));
 320                 return 1;
 321         }
 322
 323         memset(&addr, 0, sizeof addr);
 324         addr.sun_family = AF_UNIX;
 325         strncpy(addr.sun_path, controlfilename, sizeof addr.sun_path - 1);
 326
 327         if(connect(fd, (struct sockaddr *)&addr, sizeof addr) < 0) {
 328                 fprintf(stderr, _("Cannot connect to %s: %s\n"), controlfilename, strerror(errno));
 329                 return 1;
 330         }
 331
 332         printf("Connected to %s.\n", controlfilename);
 333
 334         close(fd);
 335
 336         return 0;
 337 }