[tripe] / client.c

/* -*-c-*-
 *
 * $Id$
 *
 * Client for TrIPE
 *
 * (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 "config.h"

#include <ctype.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#include <sys/types.h>
#include <sys/time.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <syslog.h>

#include <sys/socket.h>
#include <sys/un.h>
#include <arpa/inet.h>
#include <netdb.h>

#include <mLib/alloc.h>
#include <mLib/darray.h>
#include <mLib/dstr.h>
#include <mLib/mdwopt.h>
#include <mLib/quis.h>
#include <mLib/report.h>
#include <mLib/sel.h>
#include <mLib/selbuf.h>
#include <mLib/sig.h>
#include <mLib/str.h>

#include "util.h"

#undef sun

/*----- Data structures ---------------------------------------------------*/

#ifndef STRING_V
#  define STRING_V
   DA_DECL(string_v, char *);
#endif

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

static const char *pidfile = 0;
static const char *logname = 0;
static FILE *logfp = 0;
static unsigned f = 0;
static int fd;

#define f_bogus 1u
#define f_spawn 2u
#define f_daemon 4u
#define f_spawnopts 8u
#define f_syslog 16u
#define f_command 32u
#define f_noinput 64u
#define f_warn 128u
#define f_uclose 256u

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

static void reap(int sig)
{
  int e = errno;
  while (waitpid(-1, 0, WNOHANG) > 0)
    ;
  errno = e;
}

static void writelog(const char *cat, const char *msg)
{
  char buf[256];
  time_t t = time(0);
  struct tm *tm = localtime(&t);
  strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", tm);
  fprintf(logfp, "%s %s: %s\n", buf, cat, msg);
}

static void cline(char *p, size_t len, void *b)
{
  char *q;
  if (!p) {
    if (f & f_command)
      die(EXIT_FAILURE, "server dropped the connection");
    exit(0);
  }
  q = str_getword(&p);
  if (!q)
    return;
  if (strcmp(q, "WARN") == 0) {
    if (f & f_syslog)
      syslog(LOG_WARNING, "%s", p);
    if (logfp)
      writelog("warning", p);
    if (f & f_warn)
      fprintf(stderr, "Warning: %s\n", p);
  } else if (strcmp(q, "TRACE") == 0) {
    if (f & f_syslog)
      syslog(LOG_DEBUG, "%s", p);
    if (logfp)
      writelog("debug", p);
  } else if (!(f & f_command)) {
    if (f & f_syslog)
      syslog(LOG_ERR, "unexpected output `%s %s'", q, p);
    if (logfp) {
      dstr d = DSTR_INIT;
      dstr_putf(&d, "unexpected output `%s %s'", q, p);
      writelog("error", d.buf);
      dstr_destroy(&d);
    }
  } else if (strcmp(q, "FAIL") == 0)
    die(EXIT_FAILURE, "%s", p);
  else if (strcmp(q, "INFO") == 0)
    puts(p);
  else if (strcmp(q, "OK") == 0)
    exit(0);
  else
    die(EXIT_FAILURE, "unexpected output `%s %s'", q, p); 
}

static void sline(char *p, size_t len, void *b)
{
  if (!p) {
    if (!(f & f_uclose))
      moan("server closed the connection");
    exit(0);
  }
  puts(p);
}

static void uline(char *p, size_t len, void *b)
{
  if (!p) {
    selbuf_destroy(b);
    shutdown(fd, 1);
    f |= f_uclose;
  } else {
    p[len] = '\n';
    errno = EIO;
    if (write(fd, p, len + 1) != len + 1)
      moan("write failed: %s", strerror(errno));
  }
}

static void setup(const char *cmd)
{
  dstr d = DSTR_INIT;
  char ch;
  char *p, *q;
  int n;

  dstr_puts(&d, cmd);
  dstr_putc(&d, '\n');
  errno = EIO; /* Relax: be vague */
  if (write(fd, d.buf, d.len) != d.len) {
    die(EXIT_FAILURE, "error sending setup command `%s': %s",
	cmd, strerror(errno));
  }
  dstr_reset(&d);
  for (;;) {
    n = read(fd, &ch, 1);
    if (!n)
      die(EXIT_FAILURE, "unexpected EOF during setup");
    if (n < 0) {
      die(EXIT_FAILURE, "error receiving reply to `%s': %s",
	  cmd, strerror(errno));
    }
    if (d.len < 256)
      dstr_putc(&d, ch);
    if (ch == '\n') {
      p = d.buf;
      q = str_getword(&p);
      if (!q)
	;
      else if (strcmp(q, "OK") == 0)
	return;
      else if (strcmp(q, "FAIL") == 0)
	die(EXIT_FAILURE, "setup command `%s' failed: %s", cmd, p);
      dstr_reset(&d);
    }
  }
}

static void logfile(const char *name)
{
  FILE *fp;

  if ((fp = fopen(name, "a")) != 0) {
    if (logfp)
      fclose(logfp);
    logfp =  fp;
    setvbuf(logfp, 0, _IOLBF, BUFSIZ);
  } else {
    dstr d = DSTR_INIT;
    dstr_putf(&d, "error opening logfile `%s': %s", name, strerror(errno));
    if (logfp)
      writelog("error", d.buf);
    else if (logname)
      die(EXIT_FAILURE, d.buf);
    if (f & f_syslog)
      syslog(LOG_ERR, d.buf);
    dstr_destroy(&d);
  }
}

static void sighup(int sig, void *v)
{
  logfile(logname);
}

static void cleanup(void)
{
  if (pidfile)
    unlink(pidfile);
}

static void sigdie(int sig)
{
  cleanup();
  signal(sig, SIG_DFL);
  raise(sig);
}

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

static void usage(FILE *fp)
{
  pquis(fp, "\
Usage:\n\
	$ [-w] [-OPTIONS] [COMMAND [ARGS]...]\n\
	$ [-Dl] [-f FILE] [-OPTIONS]\n\
Options:\n\
	[-s] [-d DIRECTORY] [-a SOCKET] [-P PIDFILE]\n\
	[-p PROGRAM] [-S ARG,ARG,...]\n\
");
}

static void help(FILE *fp)
{
  version(fp);
  fputc('\n', fp);
  usage(fp);
  fputs("\
\n\
Options in full:\n\
\n\
-h, --help		Show this help text.\n\
-v, --version		Show version number.\n\
-u, --usage		Show brief usage message.\n\
\n\
-D, --daemon		Become a background task after connecting.\n\
-d, --directory=DIR	Select current directory [default " CONFIGDIR "].\n\
-a, --admin-socket=FILE	Select socket to connect to\n\
                          [default " SOCKETDIR "/tripesock].\n\
-P, --pidfile=FILE	Write process-id to FILE.\n\
\n\
-s, --spawn		Start server rather than connecting.\n\
-p, --spawn-path=PATH	Specify path to executable.\n\
-S, --spawn-args=ARGS	Specify comma-separated arguments.\n\
\n\
-l, --syslog		Log messages to system log.\n\
-f, --logfile=FILE	Log messages to FILE.\n\
-w, --warnings		Show warnings when running commands.\n\
", fp);
}

int main(int argc, char *argv[])
{
  const char *dir = CONFIGDIR;
  const char *sock = SOCKETDIR "/tripesock";
  const char *spawnpath = "tripe";
  string_v spawnopts = DA_INIT;
  char *p;
  FILE *pidfp = 0;

  ego(argv[0]);

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

  /* --- Parse the arguments --- */

  for (;;) {
    static const struct option opts[] = {
      { "help",		0,		0,	'h' },
      { "version",	0,		0,	'v' },
      { "usage",	0,		0,	'u' },
      { "daemon",	0,		0,	'D' },
      { "directory",	OPTF_ARGREQ,	0,	'd' },
      { "admin-socket",	OPTF_ARGREQ,	0,	'a' },
      { "spawn",	0,		0,	's' },
      { "spawn-path",	OPTF_ARGREQ,	0,	'p' },
      { "spawn-args",	OPTF_ARGREQ,	0,	'S' },
      { "syslog",	0,		0,	'l' },
      { "logfile",	OPTF_ARGREQ,	0,	'f' },
      { "warnings",	0,		0,	'w' },
      { "pidfile",	OPTF_ARGREQ,	0,	'P' },
      { 0,		0,		0,	0 }
    };

    int i = mdwopt(argc, argv, "+hvuDd:a:sp:S:lwf:nP:", 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 | f_noinput;
	break;
      case 'd':
	dir = optarg;
	break;
      case 'a':
	sock = optarg;
	break;
      case 's':
	f |= f_spawn;
	break;
      case 'p':
	f |= f_spawn;
	spawnpath = optarg;
	break;
      case 'S':
	f |= f_spawn | f_spawnopts;
	for (p = strtok(optarg, ","); p; p = strtok(0, ","))
	  DA_PUSH(&spawnopts, p);
	break;
      case 'l':
	f |= f_syslog | f_noinput;
	break;
      case 'w':
	f |= f_warn;
	break;
      case 'f':
	logname = optarg;
	f |= f_noinput;
	break;
      case 'P':
	pidfile = optarg;
	break;
      default:
	f |= f_bogus;
	break;
    }
  }
  if ((f & f_bogus) || ((f & f_noinput) && optind < argc)) {
    usage(stderr);
    exit(EXIT_FAILURE);
  }

  /* --- Set various things up --- */

  if (chdir(dir)) {
    die(EXIT_FAILURE, "couldn't set `%s' as current directory: %s",
	dir, strerror(errno));
  }
  if (logname)
    logfile(logname);
  if (!pidfile && (f & f_daemon) && ((f & f_syslog) || logname))
    pidfile = "tripectl.pid";
  if (pidfile && (pidfp = fopen(pidfile, "w")) == 0) {
    die(EXIT_FAILURE, "couldn't open `%s' for writing: %s",
	pidfile, strerror(errno));
  }
  signal(SIGINT, sigdie);
  signal(SIGQUIT, sigdie);
  signal(SIGTERM, sigdie);
  atexit(cleanup);

  /* --- Connect to the server --- */

  if (f & f_spawn) {
    int pfd[2];
    pid_t kid;
    struct sigaction sa;
    sigset_t newmask, oldmask;

    sa.sa_handler = reap;
    sigemptyset(&sa.sa_mask);
    sa.sa_flags = SA_NOCLDSTOP;
#ifdef SA_RESTART
    sa.sa_flags |= SA_RESTART;
#endif
    sigaction(SIGCHLD, &sa, 0);

    DA_UNSHIFT(&spawnopts, (char *)sock);
    DA_UNSHIFT(&spawnopts, "-a");
    DA_UNSHIFT(&spawnopts, "-d.");
    DA_UNSHIFT(&spawnopts, (char *)spawnpath);
    DA_PUSH(&spawnopts, 0);
    if (socketpair(PF_UNIX, SOCK_STREAM, 0, pfd))
      die(EXIT_FAILURE, "error from socketpair: %s", strerror(errno));
    sigemptyset(&newmask);
    sigaddset(&newmask, SIGCHLD);
    sigprocmask(SIG_BLOCK, &newmask, &oldmask);
    if ((kid = fork()) < 0)
      die(EXIT_FAILURE, "fork failed: %s", strerror(errno));
    if (!kid) {
      dup2(pfd[1], STDIN_FILENO);
      dup2(pfd[1], STDOUT_FILENO);
      close(pfd[1]);
      close(pfd[0]);
      if (logfp)
	fclose(logfp);
      if (pidfp)
	fclose(pidfp);
      closelog();
      if (f & f_daemon)
	u_detach();
      execvp(DA(&spawnopts)[0], DA(&spawnopts));
      die(127, "couldn't exec `%s': %s", spawnpath, strerror(errno));
    }
    sigprocmask(SIG_SETMASK, &oldmask, 0);
    fd = pfd[0];
    close(pfd[1]);
  } else {
    struct sockaddr_un sun;
    size_t sz = strlen(sock) + 1;
    if (sz > sizeof(sun.sun_path))
      die(EXIT_FAILURE, "socket name `%s' too long", sock);
    memset(&sun, 0, sizeof(sun));
    sun.sun_family = AF_UNIX;
    memcpy(sun.sun_path, sock, sz);
    sz = sz + offsetof(struct sockaddr_un, sun_path);
    if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
      die(EXIT_FAILURE, "error making socket: %s", strerror(errno));
    if (connect(fd, (struct sockaddr *)&sun, sz)) {
      die(EXIT_FAILURE, "error connecting to `%s': %s",
	  sun.sun_path, strerror(errno));
    }
  }

  if (f & f_daemon) {
    if (u_daemon())
      die(EXIT_FAILURE, "error becoming daemon: %s", strerror(errno));
  }
  if (pidfp) {
    fprintf(pidfp, "%li\n", (long)getpid());
    fclose(pidfp);
  }
  signal(SIGPIPE, SIG_IGN);

  /* --- If we're meant to be interactive, do that --- */

  if (optind == argc)
    setup("WATCH -A+tw");
  if (!(f & f_noinput) && optind == argc) {
    sel_state sel;
    selbuf bu, bs;

    sel_init(&sel);
    selbuf_init(&bu, &sel, STDIN_FILENO, uline, &bu);
    selbuf_init(&bs, &sel, fd, sline, &bs);
    for (;;) {
      if (sel_select(&sel) && errno != EINTR && errno != EAGAIN)
	die(EXIT_FAILURE, "select failed: %s", strerror(errno));
    }
  }

  /* --- If there's a command, submit it --- */

  if (optind < argc) {
    dstr d = DSTR_INIT;
    setup((f & f_warn) ? "WATCH -A+w" : "WATCH -A");
    dstr_puts(&d, argv[optind++]);
    while (optind < argc) {
      dstr_putc(&d, ' ');
      dstr_puts(&d, argv[optind++]);
    }
    dstr_putc(&d, '\n');
    errno = EIO;
    if (write(fd, d.buf, d.len) != d.len || shutdown(fd, 1))
      die(EXIT_FAILURE, "write failed: %s", strerror(errno));
    dstr_destroy(&d);
    f |= f_command;
  }

  /* --- Pull everything else out of the box --- */

  {
    sel_state sel;
    selbuf b;
    sig hup;

    sel_init(&sel);
    selbuf_init(&b, &sel, fd, cline, 0);

    if (f & f_syslog)
      openlog(QUIS, 0, LOG_DAEMON);
    if (logfp) {
      sig_init(&sel);
      sig_add(&hup, SIGHUP, sighup, 0);
    }
    for (;;) {
      if (sel_select(&sel) && errno != EINTR && errno != EAGAIN)
	die(EXIT_FAILURE, "select failed: %s", strerror(errno));
    }
  }

  return (0);
}

/*----- That's all, folks -------------------------------------------------*/
Commit	Line	Data
410c8acf	1	/* --c--
410c8acf	2	*
2d752320	3	* $Id$
410c8acf	4	*
	5	* Client for TrIPE
	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 ------------------------------------------------------/
410c8acf	30
73189848	31	#include "config.h"
73189848	32
410c8acf	33	#include <ctype.h>
	34	#include <errno.h>
	35	#include <signal.h>
	36	#include <stdio.h>
	37	#include <stdlib.h>
	38	#include <string.h>
	39	#include <time.h>
	40
	41	#include <sys/types.h>
	42	#include <sys/time.h>
	43	#include <unistd.h>
	44	#include <fcntl.h>
	45	#include <sys/wait.h>
	46	#include <syslog.h>
	47
	48	#include <sys/socket.h>
	49	#include <sys/un.h>
	50	#include <arpa/inet.h>
	51	#include <netdb.h>
	52
	53	#include <mLib/alloc.h>
	54	#include <mLib/darray.h>
	55	#include <mLib/dstr.h>
410c8acf	56	#include <mLib/mdwopt.h>
	57	#include <mLib/quis.h>
	58	#include <mLib/report.h>
	59	#include <mLib/sel.h>
	60	#include <mLib/selbuf.h>
5f5150b1	61	#include <mLib/sig.h>
410c8acf	62	#include <mLib/str.h>
	63
	64	#include "util.h"
	65
	66	#undef sun
	67
	68	/----- Data structures ---------------------------------------------------/
	69
	70	#ifndef STRING_V
	71	# define STRING_V
	72	DA_DECL(string_v, char *);
	73	#endif
	74
	75	/----- Static variables --------------------------------------------------/
	76
06b2a088	77	static const char *pidfile = 0;
06b2a088	78	static const char *logname = 0;
410c8acf	79	static FILE *logfp = 0;
	80	static unsigned f = 0;
	81	static int fd;
	82
	83	#define f_bogus 1u
	84	#define f_spawn 2u
	85	#define f_daemon 4u
	86	#define f_spawnopts 8u
	87	#define f_syslog 16u
	88	#define f_command 32u
	89	#define f_noinput 64u
	90	#define f_warn 128u
	91	#define f_uclose 256u
	92
	93	/----- Main code ---------------------------------------------------------/
	94
	95	static void reap(int sig)
	96	{
410c8acf	97	int e = errno;
06b2a088	98	while (waitpid(-1, 0, WNOHANG) > 0)
410c8acf	99	;
	100	errno = e;
	101	}
	102
	103	static void writelog(const char cat, const char msg)
	104	{
	105	char buf[256];
	106	time_t t = time(0);
	107	struct tm *tm = localtime(&t);
	108	strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", tm);
	109	fprintf(logfp, "%s %s: %s\n", buf, cat, msg);
	110	}
	111
6be88c14	112	static void cline(char p, size_t len, void b)
410c8acf	113	{
	114	char *q;
	115	if (!p) {
	116	if (f & f_command)
	117	die(EXIT_FAILURE, "server dropped the connection");
	118	exit(0);
	119	}
	120	q = str_getword(&p);
	121	if (!q)
	122	return;
	123	if (strcmp(q, "WARN") == 0) {
	124	if (f & f_syslog)
	125	syslog(LOG_WARNING, "%s", p);
	126	if (logfp)
	127	writelog("warning", p);
	128	if (f & f_warn)
	129	fprintf(stderr, "Warning: %s\n", p);
	130	} else if (strcmp(q, "TRACE") == 0) {
	131	if (f & f_syslog)
	132	syslog(LOG_DEBUG, "%s", p);
	133	if (logfp)
	134	writelog("debug", p);
	135	} else if (!(f & f_command)) {
	136	if (f & f_syslog)
	137	syslog(LOG_ERR, "unexpected output `%s %s'", q, p);
	138	if (logfp) {
	139	dstr d = DSTR_INIT;
	140	dstr_putf(&d, "unexpected output `%s %s'", q, p);
	141	writelog("error", d.buf);
	142	dstr_destroy(&d);
	143	}
7fadfa0d	144	} else if (strcmp(q, "FAIL") == 0)
410c8acf	145	die(EXIT_FAILURE, "%s", p);
	146	else if (strcmp(q, "INFO") == 0)
	147	puts(p);
	148	else if (strcmp(q, "OK") == 0)
	149	exit(0);
	150	else
	151	die(EXIT_FAILURE, "unexpected output `%s %s'", q, p);
	152	}
	153
6be88c14	154	static void sline(char p, size_t len, void b)
410c8acf	155	{
	156	if (!p) {
	157	if (!(f & f_uclose))
	158	moan("server closed the connection");
	159	exit(0);
	160	}
	161	puts(p);
	162	}
	163
6be88c14	164	static void uline(char p, size_t len, void b)
410c8acf	165	{
410c8acf	166	if (!p) {
	167	selbuf_destroy(b);
	168	shutdown(fd, 1);
	169	f \|= f_uclose;
	170	} else {
6be88c14	171	p[len] = '\n';
3cdc3f3a	172	errno = EIO;
	173	if (write(fd, p, len + 1) != len + 1)
	174	moan("write failed: %s", strerror(errno));
	175	}
	176	}
	177
	178	static void setup(const char *cmd)
	179	{
	180	dstr d = DSTR_INIT;
	181	char ch;
	182	char p, q;
	183	int n;
	184
	185	dstr_puts(&d, cmd);
	186	dstr_putc(&d, '\n');
	187	errno = EIO; /* Relax: be vague */
	188	if (write(fd, d.buf, d.len) != d.len) {
	189	die(EXIT_FAILURE, "error sending setup command `%s': %s",
	190	cmd, strerror(errno));
	191	}
	192	dstr_reset(&d);
	193	for (;;) {
	194	n = read(fd, &ch, 1);
	195	if (!n)
	196	die(EXIT_FAILURE, "unexpected EOF during setup");
	197	if (n < 0) {
	198	die(EXIT_FAILURE, "error receiving reply to `%s': %s",
	199	cmd, strerror(errno));
	200	}
	201	if (d.len < 256)
	202	dstr_putc(&d, ch);
	203	if (ch == '\n') {
	204	p = d.buf;
	205	q = str_getword(&p);
	206	if (!q)
	207	;
	208	else if (strcmp(q, "OK") == 0)
	209	return;
	210	else if (strcmp(q, "FAIL") == 0)
	211	die(EXIT_FAILURE, "setup command `%s' failed: %s", cmd, p);
	212	dstr_reset(&d);
	213	}
410c8acf	214	}
	215	}
	216
9dd01bc6	217	static void logfile(const char *name)
9dd01bc6	218	{
fa4bef80	219	FILE *fp;
	220
	221	if ((fp = fopen(name, "a")) != 0) {
	222	if (logfp)
	223	fclose(logfp);
	224	logfp = fp;
	225	setvbuf(logfp, 0, _IOLBF, BUFSIZ);
	226	} else {
	227	dstr d = DSTR_INIT;
	228	dstr_putf(&d, "error opening logfile `%s': %s", name, strerror(errno));
	229	if (logfp)
	230	writelog("error", d.buf);
	231	else if (logname)
	232	die(EXIT_FAILURE, d.buf);
	233	if (f & f_syslog)
	234	syslog(LOG_ERR, d.buf);
	235	dstr_destroy(&d);
9dd01bc6	236	}
9dd01bc6	237	}
9dd01bc6	238
5f5150b1	239	static void sighup(int sig, void *v)
	240	{
	241	logfile(logname);
	242	}
	243
06b2a088	244	static void cleanup(void)
	245	{
	246	if (pidfile)
	247	unlink(pidfile);
	248	}
	249
	250	static void sigdie(int sig)
	251	{
	252	cleanup();
	253	signal(sig, SIG_DFL);
	254	raise(sig);
	255	}
	256
410c8acf	257	static void version(FILE *fp)
	258	{
	259	pquis(fp, "$, TrIPE version " VERSION "\n");
	260	}
	261
	262	static void usage(FILE *fp)
	263	{
	264	pquis(fp, "\
	265	Usage:\n\
2d752320	266	$ [-w] [-OPTIONS] [COMMAND [ARGS]...]\n\
2d752320	267	$ [-Dl] [-f FILE] [-OPTIONS]\n\
410c8acf	268	Options:\n\
2d752320	269	[-s] [-d DIRECTORY] [-a SOCKET] [-P PIDFILE]\n\
2d752320	270	[-p PROGRAM] [-S ARG,ARG,...]\n\
410c8acf	271	");
	272	}
	273
	274	static void help(FILE *fp)
	275	{
	276	version(fp);
	277	fputc('\n', fp);
	278	usage(fp);
	279	fputs("\
	280	\n\
	281	Options in full:\n\
	282	\n\
	283	-h, --help Show this help text.\n\
	284	-v, --version Show version number.\n\
	285	-u, --usage Show brief usage message.\n\
	286	\n\
	287	-D, --daemon Become a background task after connecting.\n\
ef4a1ab7	288	-d, --directory=DIR Select current directory [default " CONFIGDIR "].\n\
3cdc3f3a	289	-a, --admin-socket=FILE Select socket to connect to\n\
ef4a1ab7	290	[default " SOCKETDIR "/tripesock].\n\
06b2a088	291	-P, --pidfile=FILE Write process-id to FILE.\n\
410c8acf	292	\n\
	293	-s, --spawn Start server rather than connecting.\n\
	294	-p, --spawn-path=PATH Specify path to executable.\n\
	295	-S, --spawn-args=ARGS Specify comma-separated arguments.\n\
	296	\n\
	297	-l, --syslog Log messages to system log.\n\
	298	-f, --logfile=FILE Log messages to FILE.\n\
	299	-w, --warnings Show warnings when running commands.\n\
	300	", fp);
	301	}
	302
	303	int main(int argc, char *argv[])
	304	{
ef4a1ab7	305	const char *dir = CONFIGDIR;
ef4a1ab7	306	const char *sock = SOCKETDIR "/tripesock";
410c8acf	307	const char *spawnpath = "tripe";
	308	string_v spawnopts = DA_INIT;
	309	char *p;
06b2a088	310	FILE *pidfp = 0;
410c8acf	311
	312	ego(argv[0]);
	313
	314	if ((p = getenv("TRIPEDIR")) != 0)
	315	dir = p;
	316
	317	/* --- Parse the arguments --- */
	318
	319	for (;;) {
	320	static const struct option opts[] = {
	321	{ "help", 0, 0, 'h' },
	322	{ "version", 0, 0, 'v' },
	323	{ "usage", 0, 0, 'u' },
	324	{ "daemon", 0, 0, 'D' },
	325	{ "directory", OPTF_ARGREQ, 0, 'd' },
	326	{ "admin-socket", OPTF_ARGREQ, 0, 'a' },
	327	{ "spawn", 0, 0, 's' },
	328	{ "spawn-path", OPTF_ARGREQ, 0, 'p' },
	329	{ "spawn-args", OPTF_ARGREQ, 0, 'S' },
	330	{ "syslog", 0, 0, 'l' },
	331	{ "logfile", OPTF_ARGREQ, 0, 'f' },
	332	{ "warnings", 0, 0, 'w' },
06b2a088	333	{ "pidfile", OPTF_ARGREQ, 0, 'P' },
410c8acf	334	{ 0, 0, 0, 0 }
	335	};
	336
06b2a088	337	int i = mdwopt(argc, argv, "+hvuDd:a:sp:S:lwf:nP:", opts, 0, 0, 0);
410c8acf	338	if (i < 0)
	339	break;
	340	switch (i) {
	341	case 'h':
	342	help(stdout);
	343	exit(0);
	344	case 'v':
	345	version(stdout);
	346	exit(0);
	347	case 'u':
	348	usage(stdout);
	349	exit(0);
	350	case 'D':
	351	f \|= f_daemon \| f_noinput;
	352	break;
	353	case 'd':
	354	dir = optarg;
	355	break;
	356	case 'a':
	357	sock = optarg;
	358	break;
	359	case 's':
	360	f \|= f_spawn;
	361	break;
	362	case 'p':
	363	f \|= f_spawn;
	364	spawnpath = optarg;
	365	break;
	366	case 'S':
	367	f \|= f_spawn \| f_spawnopts;
	368	for (p = strtok(optarg, ","); p; p = strtok(0, ","))
	369	DA_PUSH(&spawnopts, p);
	370	break;
	371	case 'l':
	372	f \|= f_syslog \| f_noinput;
	373	break;
	374	case 'w':
	375	f \|= f_warn;
	376	break;
	377	case 'f':
9dd01bc6	378	logname = optarg;
410c8acf	379	f \|= f_noinput;
410c8acf	380	break;
06b2a088	381	case 'P':
	382	pidfile = optarg;
	383	break;
410c8acf	384	default:
	385	f \|= f_bogus;
	386	break;
	387	}
	388	}
	389	if ((f & f_bogus) \|\| ((f & f_noinput) && optind < argc)) {
	390	usage(stderr);
	391	exit(EXIT_FAILURE);
	392	}
	393
06b2a088	394	/* --- Set various things up --- */
	395
	396	if (chdir(dir)) {
	397	die(EXIT_FAILURE, "couldn't set `%s' as current directory: %s",
	398	dir, strerror(errno));
	399	}
	400	if (logname)
	401	logfile(logname);
	402	if (!pidfile && (f & f_daemon) && ((f & f_syslog) \|\| logname))
	403	pidfile = "tripectl.pid";
	404	if (pidfile && (pidfp = fopen(pidfile, "w")) == 0) {
	405	die(EXIT_FAILURE, "couldn't open `%s' for writing: %s",
	406	pidfile, strerror(errno));
	407	}
	408	signal(SIGINT, sigdie);
	409	signal(SIGQUIT, sigdie);
	410	signal(SIGTERM, sigdie);
	411	atexit(cleanup);
	412
410c8acf	413	/* --- Connect to the server --- */
	414
	415	if (f & f_spawn) {
	416	int pfd[2];
	417	pid_t kid;
	418	struct sigaction sa;
	419	sigset_t newmask, oldmask;
	420
	421	sa.sa_handler = reap;
	422	sigemptyset(&sa.sa_mask);
	423	sa.sa_flags = SA_NOCLDSTOP;
	424	#ifdef SA_RESTART
	425	sa.sa_flags \|= SA_RESTART;
	426	#endif
	427	sigaction(SIGCHLD, &sa, 0);
	428
06b2a088	429	DA_UNSHIFT(&spawnopts, (char *)sock);
	430	DA_UNSHIFT(&spawnopts, "-a");
	431	DA_UNSHIFT(&spawnopts, "-d.");
d071d798	432	DA_UNSHIFT(&spawnopts, (char *)spawnpath);
410c8acf	433	DA_PUSH(&spawnopts, 0);
	434	if (socketpair(PF_UNIX, SOCK_STREAM, 0, pfd))
	435	die(EXIT_FAILURE, "error from socketpair: %s", strerror(errno));
	436	sigemptyset(&newmask);
	437	sigaddset(&newmask, SIGCHLD);
	438	sigprocmask(SIG_BLOCK, &newmask, &oldmask);
	439	if ((kid = fork()) < 0)
	440	die(EXIT_FAILURE, "fork failed: %s", strerror(errno));
	441	if (!kid) {
	442	dup2(pfd[1], STDIN_FILENO);
	443	dup2(pfd[1], STDOUT_FILENO);
	444	close(pfd[1]);
	445	close(pfd[0]);
9dd01bc6	446	if (logfp)
9dd01bc6	447	fclose(logfp);
7ed14135	448	if (pidfp)
7ed14135	449	fclose(pidfp);
9dd01bc6	450	closelog();
06b2a088	451	if (f & f_daemon)
06b2a088	452	u_detach();
410c8acf	453	execvp(DA(&spawnopts)[0], DA(&spawnopts));
	454	die(127, "couldn't exec `%s': %s", spawnpath, strerror(errno));
	455	}
	456	sigprocmask(SIG_SETMASK, &oldmask, 0);
	457	fd = pfd[0];
	458	close(pfd[1]);
	459	} else {
	460	struct sockaddr_un sun;
	461	size_t sz = strlen(sock) + 1;
06b2a088	462	if (sz > sizeof(sun.sun_path))
410c8acf	463	die(EXIT_FAILURE, "socket name `%s' too long", sock);
	464	memset(&sun, 0, sizeof(sun));
	465	sun.sun_family = AF_UNIX;
06b2a088	466	memcpy(sun.sun_path, sock, sz);
06b2a088	467	sz = sz + offsetof(struct sockaddr_un, sun_path);
410c8acf	468	if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
	469	die(EXIT_FAILURE, "error making socket: %s", strerror(errno));
	470	if (connect(fd, (struct sockaddr *)&sun, sz)) {
	471	die(EXIT_FAILURE, "error connecting to `%s': %s",
9dd01bc6	472	sun.sun_path, strerror(errno));
410c8acf	473	}
	474	}
	475
	476	if (f & f_daemon) {
	477	if (u_daemon())
	478	die(EXIT_FAILURE, "error becoming daemon: %s", strerror(errno));
	479	}
06b2a088	480	if (pidfp) {
a803add7	481	fprintf(pidfp, "%li\n", (long)getpid());
06b2a088	482	fclose(pidfp);
06b2a088	483	}
3cdc3f3a	484	signal(SIGPIPE, SIG_IGN);
410c8acf	485
	486	/* --- If we're meant to be interactive, do that --- */
	487
3cdc3f3a	488	if (optind == argc)
3cdc3f3a	489	setup("WATCH -A+tw");
410c8acf	490	if (!(f & f_noinput) && optind == argc) {
	491	sel_state sel;
	492	selbuf bu, bs;
	493
	494	sel_init(&sel);
	495	selbuf_init(&bu, &sel, STDIN_FILENO, uline, &bu);
	496	selbuf_init(&bs, &sel, fd, sline, &bs);
	497	for (;;) {
5f5150b1	498	if (sel_select(&sel) && errno != EINTR && errno != EAGAIN)
410c8acf	499	die(EXIT_FAILURE, "select failed: %s", strerror(errno));
	500	}
	501	}
	502
	503	/* --- If there's a command, submit it --- */
	504
	505	if (optind < argc) {
	506	dstr d = DSTR_INIT;
3cdc3f3a	507	setup((f & f_warn) ? "WATCH -A+w" : "WATCH -A");
410c8acf	508	dstr_puts(&d, argv[optind++]);
	509	while (optind < argc) {
	510	dstr_putc(&d, ' ');
	511	dstr_puts(&d, argv[optind++]);
	512	}
	513	dstr_putc(&d, '\n');
3cdc3f3a	514	errno = EIO;
	515	if (write(fd, d.buf, d.len) != d.len \|\| shutdown(fd, 1))
	516	die(EXIT_FAILURE, "write failed: %s", strerror(errno));
410c8acf	517	dstr_destroy(&d);
	518	f \|= f_command;
	519	}
	520
	521	/* --- Pull everything else out of the box --- */
	522
	523	{
5f5150b1	524	sel_state sel;
	525	selbuf b;
	526	sig hup;
	527
	528	sel_init(&sel);
	529	selbuf_init(&b, &sel, fd, cline, 0);
	530
410c8acf	531	if (f & f_syslog)
410c8acf	532	openlog(QUIS, 0, LOG_DAEMON);
9dd01bc6	533	if (logfp) {
5f5150b1	534	sig_init(&sel);
5f5150b1	535	sig_add(&hup, SIGHUP, sighup, 0);
9dd01bc6	536	}
410c8acf	537	for (;;) {
5f5150b1	538	if (sel_select(&sel) && errno != EINTR && errno != EAGAIN)
5f5150b1	539	die(EXIT_FAILURE, "select failed: %s", strerror(errno));
410c8acf	540	}
410c8acf	541	}
	542
	543	return (0);
	544	}
	545
	546	/----- That's all, folks -------------------------------------------------/