[tripe] / tripe.c

/* -*-c-*-
 *
 * $Id: tripe.c,v 1.10 2003/05/16 12:09:03 mdw Exp $
 *
 * Main program
 *
 * (c) 2001 Straylight/Edgeware
 */

/*----- Licensing notice --------------------------------------------------* 
 *
 * This file is part of Trivial IP Encryption (TrIPE).
 *
 * TrIPE 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.
 * 
 * TrIPE 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 TrIPE; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*----- Revision history --------------------------------------------------* 
 *
 * $Log: tripe.c,v $
 * Revision 1.10  2003/05/16 12:09:03  mdw
 * Allow binding to a chosen address.
 *
 * Revision 1.9  2003/04/15 14:11:09  mdw
 * Rationalize the behaviour of the `-G' and `-U' options.
 *
 * Revision 1.8  2002/01/13 17:28:29  mdw
 * Don't turn tracing on if tracing is turned off (!).
 *
 * Revision 1.7  2002/01/13 17:14:05  mdw
 * Don't include the tracing option in the help if not compiled in.
 *
 * Revision 1.6  2001/06/19 22:08:37  mdw
 * Moved buffers to peer.c.
 *
 * Revision 1.5  2001/02/16 21:43:12  mdw
 * Provide a more helpful usage message.
 *
 * Revision 1.4  2001/02/16 21:41:31  mdw
 * Add a new buffer.
 *
 * Revision 1.3  2001/02/04 17:10:40  mdw
 * Remove a debugging @abort@ call.
 *
 * Revision 1.2  2001/02/03 22:33:00  mdw
 * Stuff more randomness into the pool in the interval timer.
 *
 * Revision 1.1  2001/02/03 20:26:37  mdw
 * Initial checkin.
 *
 */

/*----- Header files ------------------------------------------------------*/

#include "tripe.h"

/*----- Global variables --------------------------------------------------*/

sel_state sel;

/*----- Static variables --------------------------------------------------*/

static sel_timer it;
#define T_INTERVAL MIN(1)

/*----- Main code ---------------------------------------------------------*/

/* --- @interval@ --- *
 *
 * Arguments:	@struct timeval *tv@ = time when called
 *		@void *v@ = boring pointer
 *
 * Returns:	---
 *
 * Use:		Called periodically to do housekeeping tasks.
 */

void interval(struct timeval *tv, void *v)
{
  struct timeval tvv;
  T( trace(T_PEER, "peer: interval timer"); )
  rand_seed(RAND_GLOBAL, HASHSZ);
  p_interval();
  tvv = *tv;
  tvv.tv_sec += T_INTERVAL;
  sel_addtimer(&sel, &it, &tvv, interval, v);
}

/* --- @main@ --- *
 *
 * Arguments:	@int argc@ = number of command line arguments
 *		@char *argv[]@ = vector of arguments
 *
 * Returns:	Zero if OK, nonzero on error.
 *
 * Use:		Main program.  Provides a simple VPN.
 */

static void usage(FILE *fp)
{
  pquis(fp, "Usage: $ [-D] [-d dir] [-p port] [-U user] [-G group]\n\
	[-k priv-keyring] [-K pub-keyring] [-t key-tag]\n\
	[-a socket] [-T trace-opts]\n");
}

static void version(FILE *fp)
{
  pquis(fp, "$, version " VERSION "\n");
}

static void help(FILE *fp)
{
  version(fp);
  fputc('\n', fp);
  usage(fp);
  fputs("\n\
Options:\n\
\n\
-h, --help		Display this help text.\n\
-v, --version		Display version number.\n\
-u, --usage		Display pointless usage message.\n\
\n\
-D, --daemon		Run in the background.\n\
-d, --directory=DIR	Switch to directory DIR (default $TRIPEDIR).\n\
-p, --port=PORT		Select UDP port to listen to.\n\
-u, --setuid=USER	Set uid to USER after initialization.\n\
-g, --setgid=GROUP	Set gid to GROUP after initialization.\n\
-k, --priv-keyring=FILE	Get private key from FILE.\n\
-K, --pub-keyring=FILE	Get public keys from FILE.\n\
-t, --tag=KEYTAG	Use private key labelled TAG.\n\
-a, --admin-socket=FILE	Use FILE as the adminstration socket.\n\
" T( "\
-T, --trace=OPTIONS	Turn on tracing options.\n\
" ) "\
", fp);
}

int main(int argc, char *argv[])
{
  const char *kr_priv = "keyring", *kr_pub = "keyring.pub";
  const char *tag_priv = "tripe-dh";
  const char *csock = "tripesock";
  const char *dir = "/var/lib/tripe";
  const char *p;
  unsigned port = 0;
  struct in_addr baddr = { INADDR_ANY };
  unsigned f = 0;
  uid_t u = -1;
  gid_t g = -1;

#define f_bogus 1u
#define f_daemon 2u

  ego(argv[0]);
  T( trace_on(stderr, 0); )

  if ((p = getenv("TRIPEDIR")) != 0)
    dir = p;

  for (;;) {
    static const struct option opts[] = {
      { "help",		0,		0,	'h' },
      { "version",	0,		0,	'v' },
      { "usage",	0,		0,	'u' },

      { "daemon",	0,		0,	'D' },
      { "uid",		OPTF_ARGREQ,	0,	'U' },
      { "setuid",	OPTF_ARGREQ,	0,	'U' },
      { "gid",		OPTF_ARGREQ,	0,	'G' },
      { "setgid",	OPTF_ARGREQ,	0,	'G' },
      { "bind-address",	OPTF_ARGREQ,	0,	'b' },
      { "port",		OPTF_ARGREQ,	0,	'p' },
      { "directory",	OPTF_ARGREQ,	0,	'd' },
      { "priv-keyring",	OPTF_ARGREQ,	0,	'k' },
      { "pub-keyring",	OPTF_ARGREQ,	0,	'K' },
      { "tag",		OPTF_ARGREQ,	0,	't' },
      { "admin-socket", OPTF_ARGREQ,	0,	'a' },
#ifndef NTRACE
      { "trace",	OPTF_ARGREQ,	0,	'T' },
#endif

      { 0,		0,		0,	0 }
    };

    int i = mdwopt(argc, argv, "hvu DU:G: b:p:d:k:K:t:a:" T("T:"),
		   opts, 0, 0, 0);
    if (i < 0)
      break;
    switch (i) {
      case 'h':
	help(stdout);
	exit(0);
      case 'v':
	version(stdout);
	exit(0);
      case 'u':
	usage(stdout);
	exit(0);

      case 'D':
	f |= f_daemon;
	break;
      case 'U': {
	struct passwd *pw;
	char *p;
	unsigned long i = strtoul(optarg, &p, 0);
	if (!*p)
	  pw = getpwuid(i);
	else
	  pw = getpwnam(optarg);
	if (!pw)
	  die(EXIT_FAILURE, "user `%s' not found", optarg);
	u = pw->pw_uid;
	if (g == -1)
	  g = pw->pw_gid;
      } break;
      case 'G': {
	struct group *gr;
	char *p;
	unsigned long i = strtoul(optarg, &p, 0);
	if (!*p)
	  gr = getgrgid(i);
	else
	  gr = getgrnam(optarg);
	if (!gr)
	  die(EXIT_FAILURE, "group `%s' not found", optarg);
	g = gr->gr_gid;
      } break;

      case 'b': {
	struct hostent *h = gethostbyname(optarg);
	if (!h)
	  die(EXIT_FAILURE, "unknown host name `%s'", optarg);
	memcpy(&baddr, h->h_addr, sizeof(struct in_addr));
      } break;
      case 'p': {
	char *p;
	unsigned long i = strtoul(optarg, &p, 0);
	if (*p) {
	  struct servent *s = getservbyname(optarg, "udp");
	  if (!s)
	    die(EXIT_FAILURE, "unknown service name `%s'", optarg);
	  i = ntohs(s->s_port);
	}
	if (i == 0 || i >= 65536)
	  die(EXIT_FAILURE, "bad port number %lu", i);
	port = i;
      } break;
      case 'd':
	dir = optarg;
	break;
      case 'k':
	kr_priv = optarg;
	break;
      case 'K':
	kr_pub = optarg;
	break;
      case 'a':
	csock = optarg;
	break;
      case 't':
	tag_priv = optarg;
	break;
#ifndef NTRACE
      case 'T':
	tr_flags = traceopt(tr_opts, optarg, tr_flags, 0);
	trace_level(tr_flags);
	break;
#endif
      default:
	f |= f_bogus;
	break;
    }
  }

  if (optind < argc || (f & f_bogus)) {
    usage(stderr);
    exit(EXIT_FAILURE);
  }

  if (chdir(dir)) {
    die(EXIT_FAILURE, "can't set current directory to `%s': %s",
	dir, strerror(errno));
  }

  sel_init(&sel);
  sig_init(&sel);
  rand_noisesrc(RAND_GLOBAL, &noise_source);
  rand_seed(RAND_GLOBAL, RMD160_HASHSZ);
  signal(SIGPIPE, SIG_IGN);
  tun_init();
  p_init(baddr, port);
  if (!(f & f_daemon))
    a_create(STDIN_FILENO, STDOUT_FILENO);
  if (g != (gid_t)-1) {
    if (setgid(g) || (getuid() == 0 && setgroups(1, &g))) {
      die(EXIT_FAILURE, "couldn't setgid to %u: %s",
	  (unsigned)g, strerror(errno));
    }
  }
  if (u != (uid_t)-1) {
    if (setuid(u)) {
      die(EXIT_FAILURE, "couldn't setuid to %u: %s",
	  (unsigned)u, strerror(errno));
    }
  }
  km_init(kr_priv, kr_pub, tag_priv);
  a_init(csock);
  if (f & f_daemon) {
    if (u_daemon())
      die(EXIT_FAILURE, "couldn't become a daemon: %s", strerror(errno));
    a_daemon();
  }

  {
    struct timeval tv;
    tv.tv_sec = time(0) + T_INTERVAL;
    tv.tv_usec = 0;
    sel_addtimer(&sel, &it, &tv, interval, 0);
  }

  {
    int selerr = 0;
    for (;;) {
      if (!sel_select(&sel))
        selerr = 0;
      else if (errno != EINTR && errno != EAGAIN) {
	a_warn("select failed: %s", strerror(errno));
	selerr++;
	if (selerr > 8) {
	  a_warn("too many select errors: bailing out");
	  a_quit();
	}
      }
    }
  }

  return (0);
}

/*----- That's all, folks -------------------------------------------------*/
Commit	Line	Data
410c8acf	1	/* --c--
410c8acf	2	*
767b36e2	3	* $Id: tripe.c,v 1.10 2003/05/16 12:09:03 mdw Exp $
410c8acf	4	*
	5	* Main program
	6	*
	7	* (c) 2001 Straylight/Edgeware
	8	*/
	9
	10	/----- Licensing notice --------------------------------------------------
	11	*
	12	* This file is part of Trivial IP Encryption (TrIPE).
	13	*
	14	* TrIPE is free software; you can redistribute it and/or modify
	15	* it under the terms of the GNU General Public License as published by
	16	* the Free Software Foundation; either version 2 of the License, or
	17	* (at your option) any later version.
	18	*
	19	* TrIPE is distributed in the hope that it will be useful,
	20	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	21	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	22	* GNU General Public License for more details.
	23	*
	24	* You should have received a copy of the GNU General Public License
	25	* along with TrIPE; if not, write to the Free Software Foundation,
	26	* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	27	*/
	28
	29	/----- Revision history --------------------------------------------------
	30	*
	31	* $Log: tripe.c,v $
767b36e2	32	* Revision 1.10 2003/05/16 12:09:03 mdw
	33	* Allow binding to a chosen address.
	34	*
b303b584	35	* Revision 1.9 2003/04/15 14:11:09 mdw
	36	* Rationalize the behaviour of the `-G' and `-U' options.
	37	*
d360f042	38	* Revision 1.8 2002/01/13 17:28:29 mdw
	39	* Don't turn tracing on if tracing is turned off (!).
	40	*
c5a2ea9b	41	* Revision 1.7 2002/01/13 17:14:05 mdw
	42	* Don't include the tracing option in the help if not compiled in.
	43	*
2666d7dd	44	* Revision 1.6 2001/06/19 22:08:37 mdw
	45	* Moved buffers to peer.c.
	46	*
680bfcf4	47	* Revision 1.5 2001/02/16 21:43:12 mdw
	48	* Provide a more helpful usage message.
	49	*
37852359	50	* Revision 1.4 2001/02/16 21:41:31 mdw
	51	* Add a new buffer.
	52	*
efd6c9e3	53	* Revision 1.3 2001/02/04 17:10:40 mdw
	54	* Remove a debugging @abort@ call.
	55	*
e31c0b14	56	* Revision 1.2 2001/02/03 22:33:00 mdw
	57	* Stuff more randomness into the pool in the interval timer.
	58	*
410c8acf	59	* Revision 1.1 2001/02/03 20:26:37 mdw
	60	* Initial checkin.
	61	*
	62	*/
	63
	64	/----- Header files ------------------------------------------------------/
	65
	66	#include "tripe.h"
	67
	68	/----- Global variables --------------------------------------------------/
	69
	70	sel_state sel;
410c8acf	71
	72	/----- Static variables --------------------------------------------------/
	73
	74	static sel_timer it;
	75	#define T_INTERVAL MIN(1)
	76
	77	/----- Main code ---------------------------------------------------------/
	78
	79	/* --- @interval@ --- *
	80	*
	81	* Arguments: @struct timeval *tv@ = time when called
	82	* @void *v@ = boring pointer
	83	*
	84	* Returns: ---
	85	*
	86	* Use: Called periodically to do housekeeping tasks.
	87	*/
	88
	89	void interval(struct timeval tv, void v)
	90	{
	91	struct timeval tvv;
	92	T( trace(T_PEER, "peer: interval timer"); )
37852359	93	rand_seed(RAND_GLOBAL, HASHSZ);
410c8acf	94	p_interval();
	95	tvv = *tv;
	96	tvv.tv_sec += T_INTERVAL;
	97	sel_addtimer(&sel, &it, &tvv, interval, v);
	98	}
	99
	100	/* --- @main@ --- *
	101	*
	102	* Arguments: @int argc@ = number of command line arguments
	103	* @char *argv[]@ = vector of arguments
	104	*
	105	* Returns: Zero if OK, nonzero on error.
	106	*
	107	* Use: Main program. Provides a simple VPN.
	108	*/
	109
	110	static void usage(FILE *fp)
	111	{
b303b584	112	pquis(fp, "Usage: $ [-D] [-d dir] [-p port] [-U user] [-G group]\n\
	113	[-k priv-keyring] [-K pub-keyring] [-t key-tag]\n\
	114	[-a socket] [-T trace-opts]\n");
410c8acf	115	}
	116
	117	static void version(FILE *fp)
	118	{
	119	pquis(fp, "$, version " VERSION "\n");
	120	}
	121
	122	static void help(FILE *fp)
	123	{
	124	version(fp);
	125	fputc('\n', fp);
	126	usage(fp);
	127	fputs("\n\
	128	Options:\n\
	129	\n\
	130	-h, --help Display this help text.\n\
	131	-v, --version Display version number.\n\
	132	-u, --usage Display pointless usage message.\n\
	133	\n\
	134	-D, --daemon Run in the background.\n\
	135	-d, --directory=DIR Switch to directory DIR (default $TRIPEDIR).\n\
	136	-p, --port=PORT Select UDP port to listen to.\n\
b303b584	137	-u, --setuid=USER Set uid to USER after initialization.\n\
b303b584	138	-g, --setgid=GROUP Set gid to GROUP after initialization.\n\
410c8acf	139	-k, --priv-keyring=FILE Get private key from FILE.\n\
	140	-K, --pub-keyring=FILE Get public keys from FILE.\n\
	141	-t, --tag=KEYTAG Use private key labelled TAG.\n\
	142	-a, --admin-socket=FILE Use FILE as the adminstration socket.\n\
c5a2ea9b	143	" T( "\
410c8acf	144	-T, --trace=OPTIONS Turn on tracing options.\n\
c5a2ea9b	145	" ) "\
410c8acf	146	", fp);
	147	}
	148
	149	int main(int argc, char *argv[])
	150	{
	151	const char kr_priv = "keyring", kr_pub = "keyring.pub";
	152	const char *tag_priv = "tripe-dh";
	153	const char *csock = "tripesock";
	154	const char *dir = "/var/lib/tripe";
	155	const char *p;
	156	unsigned port = 0;
767b36e2	157	struct in_addr baddr = { INADDR_ANY };
410c8acf	158	unsigned f = 0;
	159	uid_t u = -1;
	160	gid_t g = -1;
	161
	162	#define f_bogus 1u
	163	#define f_daemon 2u
	164
	165	ego(argv[0]);
d360f042	166	T( trace_on(stderr, 0); )
410c8acf	167
	168	if ((p = getenv("TRIPEDIR")) != 0)
	169	dir = p;
	170
	171	for (;;) {
	172	static const struct option opts[] = {
	173	{ "help", 0, 0, 'h' },
	174	{ "version", 0, 0, 'v' },
	175	{ "usage", 0, 0, 'u' },
	176
	177	{ "daemon", 0, 0, 'D' },
	178	{ "uid", OPTF_ARGREQ, 0, 'U' },
	179	{ "setuid", OPTF_ARGREQ, 0, 'U' },
	180	{ "gid", OPTF_ARGREQ, 0, 'G' },
	181	{ "setgid", OPTF_ARGREQ, 0, 'G' },
767b36e2	182	{ "bind-address", OPTF_ARGREQ, 0, 'b' },
410c8acf	183	{ "port", OPTF_ARGREQ, 0, 'p' },
	184	{ "directory", OPTF_ARGREQ, 0, 'd' },
	185	{ "priv-keyring", OPTF_ARGREQ, 0, 'k' },
	186	{ "pub-keyring", OPTF_ARGREQ, 0, 'K' },
	187	{ "tag", OPTF_ARGREQ, 0, 't' },
	188	{ "admin-socket", OPTF_ARGREQ, 0, 'a' },
	189	#ifndef NTRACE
	190	{ "trace", OPTF_ARGREQ, 0, 'T' },
	191	#endif
	192
	193	{ 0, 0, 0, 0 }
	194	};
	195
767b36e2	196	int i = mdwopt(argc, argv, "hvu DU:G: b:p:d:k:K:t:a:" T("T:"),
410c8acf	197	opts, 0, 0, 0);
	198	if (i < 0)
	199	break;
	200	switch (i) {
	201	case 'h':
	202	help(stdout);
	203	exit(0);
	204	case 'v':
	205	version(stdout);
	206	exit(0);
	207	case 'u':
	208	usage(stdout);
	209	exit(0);
	210
	211	case 'D':
	212	f \|= f_daemon;
	213	break;
	214	case 'U': {
b303b584	215	struct passwd *pw;
410c8acf	216	char *p;
	217	unsigned long i = strtoul(optarg, &p, 0);
	218	if (!*p)
b303b584	219	pw = getpwuid(i);
	220	else
	221	pw = getpwnam(optarg);
	222	if (!pw)
	223	die(EXIT_FAILURE, "user `%s' not found", optarg);
	224	u = pw->pw_uid;
	225	if (g == -1)
	226	g = pw->pw_gid;
410c8acf	227	} break;
410c8acf	228	case 'G': {
b303b584	229	struct group *gr;
410c8acf	230	char *p;
	231	unsigned long i = strtoul(optarg, &p, 0);
	232	if (!*p)
b303b584	233	gr = getgrgid(i);
	234	else
	235	gr = getgrnam(optarg);
	236	if (!gr)
	237	die(EXIT_FAILURE, "group `%s' not found", optarg);
	238	g = gr->gr_gid;
410c8acf	239	} break;
767b36e2	240
	241	case 'b': {
	242	struct hostent *h = gethostbyname(optarg);
	243	if (!h)
	244	die(EXIT_FAILURE, "unknown host name `%s'", optarg);
	245	memcpy(&baddr, h->h_addr, sizeof(struct in_addr));
	246	} break;
410c8acf	247	case 'p': {
	248	char *p;
	249	unsigned long i = strtoul(optarg, &p, 0);
	250	if (*p) {
	251	struct servent *s = getservbyname(optarg, "udp");
	252	if (!s)
	253	die(EXIT_FAILURE, "unknown service name `%s'", optarg);
	254	i = ntohs(s->s_port);
	255	}
	256	if (i == 0 \|\| i >= 65536)
	257	die(EXIT_FAILURE, "bad port number %lu", i);
	258	port = i;
	259	} break;
	260	case 'd':
	261	dir = optarg;
	262	break;
	263	case 'k':
	264	kr_priv = optarg;
	265	break;
	266	case 'K':
	267	kr_pub = optarg;
	268	break;
	269	case 'a':
	270	csock = optarg;
	271	break;
	272	case 't':
	273	tag_priv = optarg;
	274	break;
	275	#ifndef NTRACE
	276	case 'T':
	277	tr_flags = traceopt(tr_opts, optarg, tr_flags, 0);
	278	trace_level(tr_flags);
	279	break;
	280	#endif
	281	default:
	282	f \|= f_bogus;
	283	break;
	284	}
	285	}
	286
	287	if (optind < argc \|\| (f & f_bogus)) {
	288	usage(stderr);
	289	exit(EXIT_FAILURE);
	290	}
	291
	292	if (chdir(dir)) {
	293	die(EXIT_FAILURE, "can't set current directory to `%s': %s",
	294	dir, strerror(errno));
	295	}
	296
	297	sel_init(&sel);
	298	sig_init(&sel);
	299	rand_noisesrc(RAND_GLOBAL, &noise_source);
	300	rand_seed(RAND_GLOBAL, RMD160_HASHSZ);
	301	signal(SIGPIPE, SIG_IGN);
	302	tun_init();
767b36e2	303	p_init(baddr, port);
410c8acf	304	if (!(f & f_daemon))
410c8acf	305	a_create(STDIN_FILENO, STDOUT_FILENO);
b303b584	306	if (g != (gid_t)-1) {
b303b584	307	if (setgid(g) \|\| (getuid() == 0 && setgroups(1, &g))) {
410c8acf	308	die(EXIT_FAILURE, "couldn't setgid to %u: %s",
	309	(unsigned)g, strerror(errno));
	310	}
	311	}
b303b584	312	if (u != (uid_t)-1) {
410c8acf	313	if (setuid(u)) {
	314	die(EXIT_FAILURE, "couldn't setuid to %u: %s",
	315	(unsigned)u, strerror(errno));
	316	}
	317	}
	318	km_init(kr_priv, kr_pub, tag_priv);
	319	a_init(csock);
	320	if (f & f_daemon) {
37852359	321	if (u_daemon())
410c8acf	322	die(EXIT_FAILURE, "couldn't become a daemon: %s", strerror(errno));
	323	a_daemon();
	324	}
	325
	326	{
	327	struct timeval tv;
	328	tv.tv_sec = time(0) + T_INTERVAL;
	329	tv.tv_usec = 0;
	330	sel_addtimer(&sel, &it, &tv, interval, 0);
	331	}
	332
	333	{
	334	int selerr = 0;
	335	for (;;) {
	336	if (!sel_select(&sel))
	337	selerr = 0;
	338	else if (errno != EINTR && errno != EAGAIN) {
	339	a_warn("select failed: %s", strerror(errno));
410c8acf	340	selerr++;
	341	if (selerr > 8) {
	342	a_warn("too many select errors: bailing out");
	343	a_quit();
	344	}
	345	}
	346	}
	347	}
	348
	349	return (0);
	350	}
	351
	352	/----- That's all, folks -------------------------------------------------/