[tripe] / server / tripe.c

/* -*-c-*-
 *
 * $Id$
 *
 * 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.
 */

/*----- 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.
 */

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

/* --- @mystrieq@ --- *
 *
 * Arguments:	@const char *x, *y@ = two strings
 *
 * Returns:	True if @x@ and @y are equal, up to case.
 */

int mystrieq(const char *x, const char *y)
{
  for (;;) {
    if (!*x && !*y) return (1);
    if (tolower((unsigned char)*x) != tolower((unsigned char)*y))
      return (0);
    x++; y++;
  }
}

/* --- @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] [-b ADDR] [-p PORT] [-n TUNNEL]\n\
	[-U USER] [-G GROUP] [-a SOCKET] [-T TRACE-OPTS]\n\
	[-k PRIV-KEYRING] [-K PUB-KEYRING] [-t KEY-TAG]\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\
    --tunnels		Display IP tunnel drivers and exit.\n\
\n\
-D, --daemon		Run in the background.\n\
-d, --directory=DIR	Switch to directory DIR [default " CONFIGDIR "].\n\
-b, --bind-address=ADDR	Bind UDP socket to this IP ADDR.\n\
-p, --port=PORT		Select UDP port to listen to.\n\
-n, --tunnel=TUNNEL	Seelect default tunnel driver.\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 = SOCKETDIR "/tripesock";
  const char *dir = CONFIGDIR;
  const char *p;
  unsigned port = 0;
  struct in_addr baddr = { INADDR_ANY };
  unsigned f = 0;
  int i;
  int selerr = 0;
  struct timeval tv;
  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;
  tun_default = tunnels[0];

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

      { "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' },
      { "tunnel",	OPTF_ARGREQ,	0,	'n' },
      { "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 }
    };

    i = mdwopt(argc, argv, "hvuDU: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 'n': {
	int i;
	for (i = 0;; i++) {
	  if (!tunnels[i])
	    die(EXIT_FAILURE, "unknown tunnel `%s'", optarg);
	  if (mystrieq(optarg, tunnels[i]->name))
	    break;
	}
	tun_default = tunnels[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
      case '0': {
	int i;
	for (i = 0; tunnels[i]; i++)
	  puts(tunnels[i]->name);
	exit(0);
      } break;
      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, MAXHASHSZ);
  signal(SIGPIPE, SIG_IGN);
  for (i = 0; tunnels[i]; i++)
    tunnels[i]->init();
  p_init(baddr, port);
  if (!(f & f_daemon)) {
#ifndef NTRACE
    a_create(STDIN_FILENO, STDOUT_FILENO, AF_TRACE | AF_WARN);
#else
    a_create(STDIN_FILENO, STDOUT_FILENO, AF_WARN);
#endif
  }
  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();
  }

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

  for (;;) {
    if (!sel_select(&sel))
      selerr = 0;
    else if (errno != EINTR && errno != EAGAIN) {
      a_warn("SERVER", "select-error", "?ERRNO", A_END);
      selerr++;
      if (selerr > 8) {
	a_warn("ABORT", "repeated-select-errors", A_END);
	abort();
      }
    }
  }

  return (0);
}

/*----- That's all, folks -------------------------------------------------*/
Commit	Line	Data
410c8acf	1	/* --c--
410c8acf	2	*
2d752320	3	* $Id$
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
410c8acf	29	/----- Header files ------------------------------------------------------/
	30
	31	#include "tripe.h"
	32
	33	/----- Global variables --------------------------------------------------/
	34
	35	sel_state sel;
410c8acf	36
	37	/----- Static variables --------------------------------------------------/
	38
	39	static sel_timer it;
	40	#define T_INTERVAL MIN(1)
	41
	42	/----- Main code ---------------------------------------------------------/
	43
	44	/* --- @interval@ --- *
	45	*
	46	* Arguments: @struct timeval *tv@ = time when called
	47	* @void *v@ = boring pointer
	48	*
	49	* Returns: ---
	50	*
	51	* Use: Called periodically to do housekeeping tasks.
	52	*/
	53
42da2a58	54	static void interval(struct timeval tv, void v)
410c8acf	55	{
	56	struct timeval tvv;
	57	T( trace(T_PEER, "peer: interval timer"); )
b5c45da1	58	rand_seed(RAND_GLOBAL, MAXHASHSZ);
410c8acf	59	p_interval();
	60	tvv = *tv;
	61	tvv.tv_sec += T_INTERVAL;
	62	sel_addtimer(&sel, &it, &tvv, interval, v);
	63	}
	64
42da2a58	65	/* --- @mystrieq@ --- *
	66	*
	67	* Arguments: @const char x, y@ = two strings
	68	*
	69	* Returns: True if @x@ and @y are equal, up to case.
	70	*/
	71
	72	int mystrieq(const char x, const char y)
	73	{
	74	for (;;) {
	75	if (!x && !y) return (1);
	76	if (tolower((unsigned char)x) != tolower((unsigned char)y))
	77	return (0);
	78	x++; y++;
	79	}
	80	}
	81
410c8acf	82	/* --- @main@ --- *
	83	*
	84	* Arguments: @int argc@ = number of command line arguments
	85	* @char *argv[]@ = vector of arguments
	86	*
	87	* Returns: Zero if OK, nonzero on error.
	88	*
	89	* Use: Main program. Provides a simple VPN.
	90	*/
	91
	92	static void usage(FILE *fp)
	93	{
42da2a58	94	pquis(fp, "Usage: $ [-D] [-d DIR] [-b ADDR] [-p PORT] [-n TUNNEL]\n\
2d752320	95	[-U USER] [-G GROUP] [-a SOCKET] [-T TRACE-OPTS]\n\
2d752320	96	[-k PRIV-KEYRING] [-K PUB-KEYRING] [-t KEY-TAG]\n");
410c8acf	97	}
	98
	99	static void version(FILE *fp)
	100	{
	101	pquis(fp, "$, version " VERSION "\n");
	102	}
	103
	104	static void help(FILE *fp)
	105	{
	106	version(fp);
	107	fputc('\n', fp);
	108	usage(fp);
	109	fputs("\n\
	110	Options:\n\
	111	\n\
	112	-h, --help Display this help text.\n\
	113	-v, --version Display version number.\n\
	114	-u, --usage Display pointless usage message.\n\
42da2a58	115	--tunnels Display IP tunnel drivers and exit.\n\
410c8acf	116	\n\
410c8acf	117	-D, --daemon Run in the background.\n\
ef4a1ab7	118	-d, --directory=DIR Switch to directory DIR [default " CONFIGDIR "].\n\
d13e5724	119	-b, --bind-address=ADDR Bind UDP socket to this IP ADDR.\n\
410c8acf	120	-p, --port=PORT Select UDP port to listen to.\n\
42da2a58	121	-n, --tunnel=TUNNEL Seelect default tunnel driver.\n\
d13e5724	122	-U, --setuid=USER Set uid to USER after initialization.\n\
d13e5724	123	-G, --setgid=GROUP Set gid to GROUP after initialization.\n\
410c8acf	124	-k, --priv-keyring=FILE Get private key from FILE.\n\
	125	-K, --pub-keyring=FILE Get public keys from FILE.\n\
	126	-t, --tag=KEYTAG Use private key labelled TAG.\n\
	127	-a, --admin-socket=FILE Use FILE as the adminstration socket.\n\
c5a2ea9b	128	" T( "\
410c8acf	129	-T, --trace=OPTIONS Turn on tracing options.\n\
c5a2ea9b	130	" ) "\
410c8acf	131	", fp);
	132	}
	133
	134	int main(int argc, char *argv[])
	135	{
	136	const char kr_priv = "keyring", kr_pub = "keyring.pub";
	137	const char *tag_priv = "tripe-dh";
ef4a1ab7	138	const char *csock = SOCKETDIR "/tripesock";
ef4a1ab7	139	const char *dir = CONFIGDIR;
410c8acf	140	const char *p;
410c8acf	141	unsigned port = 0;
767b36e2	142	struct in_addr baddr = { INADDR_ANY };
410c8acf	143	unsigned f = 0;
42da2a58	144	int i;
	145	int selerr = 0;
	146	struct timeval tv;
410c8acf	147	uid_t u = -1;
	148	gid_t g = -1;
	149
	150	#define f_bogus 1u
	151	#define f_daemon 2u
	152
	153	ego(argv[0]);
d360f042	154	T( trace_on(stderr, 0); )
410c8acf	155
	156	if ((p = getenv("TRIPEDIR")) != 0)
	157	dir = p;
42da2a58	158	tun_default = tunnels[0];
410c8acf	159
	160	for (;;) {
	161	static const struct option opts[] = {
	162	{ "help", 0, 0, 'h' },
	163	{ "version", 0, 0, 'v' },
	164	{ "usage", 0, 0, 'u' },
42da2a58	165	{ "tunnels", 0, 0, '0' },
410c8acf	166
	167	{ "daemon", 0, 0, 'D' },
	168	{ "uid", OPTF_ARGREQ, 0, 'U' },
	169	{ "setuid", OPTF_ARGREQ, 0, 'U' },
	170	{ "gid", OPTF_ARGREQ, 0, 'G' },
	171	{ "setgid", OPTF_ARGREQ, 0, 'G' },
767b36e2	172	{ "bind-address", OPTF_ARGREQ, 0, 'b' },
42da2a58	173	{ "tunnel", OPTF_ARGREQ, 0, 'n' },
410c8acf	174	{ "port", OPTF_ARGREQ, 0, 'p' },
	175	{ "directory", OPTF_ARGREQ, 0, 'd' },
	176	{ "priv-keyring", OPTF_ARGREQ, 0, 'k' },
	177	{ "pub-keyring", OPTF_ARGREQ, 0, 'K' },
	178	{ "tag", OPTF_ARGREQ, 0, 't' },
	179	{ "admin-socket", OPTF_ARGREQ, 0, 'a' },
	180	#ifndef NTRACE
	181	{ "trace", OPTF_ARGREQ, 0, 'T' },
	182	#endif
	183
	184	{ 0, 0, 0, 0 }
	185	};
	186
42da2a58	187	i = mdwopt(argc, argv, "hvuDU:G:b:p:d:k:K:t:a:" T("T:"),
42da2a58	188	opts, 0, 0, 0);
410c8acf	189	if (i < 0)
	190	break;
	191	switch (i) {
	192	case 'h':
	193	help(stdout);
	194	exit(0);
	195	case 'v':
	196	version(stdout);
	197	exit(0);
	198	case 'u':
	199	usage(stdout);
	200	exit(0);
	201
	202	case 'D':
	203	f \|= f_daemon;
	204	break;
	205	case 'U': {
b303b584	206	struct passwd *pw;
410c8acf	207	char *p;
	208	unsigned long i = strtoul(optarg, &p, 0);
	209	if (!*p)
b303b584	210	pw = getpwuid(i);
	211	else
	212	pw = getpwnam(optarg);
	213	if (!pw)
	214	die(EXIT_FAILURE, "user `%s' not found", optarg);
	215	u = pw->pw_uid;
	216	if (g == -1)
	217	g = pw->pw_gid;
410c8acf	218	} break;
410c8acf	219	case 'G': {
b303b584	220	struct group *gr;
410c8acf	221	char *p;
	222	unsigned long i = strtoul(optarg, &p, 0);
	223	if (!*p)
b303b584	224	gr = getgrgid(i);
	225	else
	226	gr = getgrnam(optarg);
	227	if (!gr)
	228	die(EXIT_FAILURE, "group `%s' not found", optarg);
	229	g = gr->gr_gid;
410c8acf	230	} break;
767b36e2	231
	232	case 'b': {
	233	struct hostent *h = gethostbyname(optarg);
	234	if (!h)
	235	die(EXIT_FAILURE, "unknown host name `%s'", optarg);
	236	memcpy(&baddr, h->h_addr, sizeof(struct in_addr));
	237	} break;
410c8acf	238	case 'p': {
	239	char *p;
	240	unsigned long i = strtoul(optarg, &p, 0);
	241	if (*p) {
	242	struct servent *s = getservbyname(optarg, "udp");
	243	if (!s)
	244	die(EXIT_FAILURE, "unknown service name `%s'", optarg);
	245	i = ntohs(s->s_port);
	246	}
	247	if (i == 0 \|\| i >= 65536)
	248	die(EXIT_FAILURE, "bad port number %lu", i);
	249	port = i;
	250	} break;
42da2a58	251	case 'n': {
	252	int i;
	253	for (i = 0;; i++) {
	254	if (!tunnels[i])
	255	die(EXIT_FAILURE, "unknown tunnel `%s'", optarg);
	256	if (mystrieq(optarg, tunnels[i]->name))
	257	break;
	258	}
	259	tun_default = tunnels[i];
	260	} break;
410c8acf	261	case 'd':
	262	dir = optarg;
	263	break;
	264	case 'k':
	265	kr_priv = optarg;
	266	break;
	267	case 'K':
	268	kr_pub = optarg;
	269	break;
	270	case 'a':
	271	csock = optarg;
	272	break;
	273	case 't':
	274	tag_priv = optarg;
	275	break;
	276	#ifndef NTRACE
	277	case 'T':
	278	tr_flags = traceopt(tr_opts, optarg, tr_flags, 0);
	279	trace_level(tr_flags);
	280	break;
	281	#endif
ef4a1ab7	282	case '0': {
42da2a58	283	int i;
	284	for (i = 0; tunnels[i]; i++)
	285	puts(tunnels[i]->name);
ef4a1ab7	286	exit(0);
ef4a1ab7	287	} break;
410c8acf	288	default:
	289	f \|= f_bogus;
	290	break;
	291	}
	292	}
	293
	294	if (optind < argc \|\| (f & f_bogus)) {
	295	usage(stderr);
	296	exit(EXIT_FAILURE);
	297	}
	298
	299	if (chdir(dir)) {
	300	die(EXIT_FAILURE, "can't set current directory to `%s': %s",
	301	dir, strerror(errno));
	302	}
	303
	304	sel_init(&sel);
	305	sig_init(&sel);
	306	rand_noisesrc(RAND_GLOBAL, &noise_source);
b5c45da1	307	rand_seed(RAND_GLOBAL, MAXHASHSZ);
410c8acf	308	signal(SIGPIPE, SIG_IGN);
42da2a58	309	for (i = 0; tunnels[i]; i++)
42da2a58	310	tunnels[i]->init();
767b36e2	311	p_init(baddr, port);
3cdc3f3a	312	if (!(f & f_daemon)) {
	313	#ifndef NTRACE
	314	a_create(STDIN_FILENO, STDOUT_FILENO, AF_TRACE \| AF_WARN);
	315	#else
	316	a_create(STDIN_FILENO, STDOUT_FILENO, AF_WARN);
	317	#endif
	318	}
b303b584	319	if (g != (gid_t)-1) {
b303b584	320	if (setgid(g) \|\| (getuid() == 0 && setgroups(1, &g))) {
410c8acf	321	die(EXIT_FAILURE, "couldn't setgid to %u: %s",
	322	(unsigned)g, strerror(errno));
	323	}
	324	}
b303b584	325	if (u != (uid_t)-1) {
410c8acf	326	if (setuid(u)) {
	327	die(EXIT_FAILURE, "couldn't setuid to %u: %s",
	328	(unsigned)u, strerror(errno));
	329	}
	330	}
	331	km_init(kr_priv, kr_pub, tag_priv);
	332	a_init(csock);
	333	if (f & f_daemon) {
37852359	334	if (u_daemon())
410c8acf	335	die(EXIT_FAILURE, "couldn't become a daemon: %s", strerror(errno));
	336	a_daemon();
	337	}
	338
42da2a58	339	tv.tv_sec = time(0) + T_INTERVAL;
	340	tv.tv_usec = 0;
	341	sel_addtimer(&sel, &it, &tv, interval, 0);
410c8acf	342
42da2a58	343	for (;;) {
	344	if (!sel_select(&sel))
	345	selerr = 0;
	346	else if (errno != EINTR && errno != EAGAIN) {
f43df819	347	a_warn("SERVER", "select-error", "?ERRNO", A_END);
42da2a58	348	selerr++;
42da2a58	349	if (selerr > 8) {
f43df819	350	a_warn("ABORT", "repeated-select-errors", A_END);
42da2a58	351	abort();
410c8acf	352	}
	353	}
	354	}
	355
	356	return (0);
	357	}
	358
	359	/----- That's all, folks -------------------------------------------------/