[tripe] / client / tripectl.c

/* -*-c-*-
 *
 * 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/daemonize.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 <mLib/versioncmp.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;
static const char *bgtag = 0;

#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 checkbg(char **p)
{
  char *q = str_getword(p);
  if (!q)
    die(EXIT_FAILURE, "missing background tag");
  if (!bgtag || strcmp(bgtag, q) != 0)
    die(EXIT_FAILURE, "unexpected background tag `%s'", q);
}

static void checkfg(void)
  { if (bgtag) die(EXIT_FAILURE, "unexpected foreground response"); }

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) {
    checkfg();
    die(EXIT_FAILURE, "%s", p);
  } else if (strcmp(q, "INFO") == 0) {
    checkfg();
    puts(p);
    fflush(stdout);
  } else if (strcmp(q, "OK") == 0) {
    checkfg();
    exit(0);
  } else if (strcmp(q, "BGDETACH") == 0) {
    if (bgtag)
      die(EXIT_FAILURE, "repeat detach");
    bgtag = xstrdup(p);
  } else if (strcmp(q, "BGOK") == 0) {
    checkbg(&p);
    exit(0);
  } else if (strcmp(q, "BGINFO") == 0) {
    checkbg(&p);
    puts(p);
    fflush(stdout);
  } else if (strcmp(q, "BGFAIL") == 0) {
    checkbg(&p);
    die(EXIT_FAILURE, "%s", p);
  } 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);
  fflush(stdout);
}

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 putarg(string_v *av, const char *fmt, ...)
{
  va_list ap;
  dstr d = DSTR_INIT;

  va_start(ap, fmt);
  dstr_vputf(&d, fmt, &ap);
  dstr_putz(&d);
  va_end(ap);
  DA_UNSHIFT(av, xstrdup(d.buf));
  dstr_destroy(&d);
}

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\
-U, --setuid=USER	Set uid to USER after initialization.\n\
-G, --setgid=GROUP	Set gid to GROUP after initialization.\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;
  uid_t u = -1;
  gid_t g = -1;

  ego(argv[0]);

  if ((p = getenv("TRIPEDIR")) != 0)
    dir = p;
  if ((p = getenv("TRIPESOCK")) != 0)
    sock = 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' },
      { "uid",		OPTF_ARGREQ,	0,	'U' },
      { "setuid",	OPTF_ARGREQ,	0,	'U' },
      { "gid",		OPTF_ARGREQ,	0,	'G' },
      { "setgid",	OPTF_ARGREQ,	0,	'G' },
      { "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, "+hvuDU:G:d: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 'U':
	u = u_getuser(optarg, &g);
	break;
      case 'G':
	g = u_getgroup(optarg);
	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_PUSH(&spawnopts, 0);
    if (g != (gid_t)-1) putarg(&spawnopts, "-G%lu", (unsigned long)g);
    if (u != (uid_t)-1) putarg(&spawnopts, "-U%lu", (unsigned long)u);
    putarg(&spawnopts, "-a%s", sock);
    putarg(&spawnopts, "-d.");
    putarg(&spawnopts, "-F");
    putarg(&spawnopts, "%s", spawnpath);
    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[0]);
      close(pfd[1]);
      if (logfp) fclose(logfp);
      if (pidfp) fclose(pidfp);
      closelog();
      if (f & f_daemon) detachtty();
      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));
    }
  }

  u_setugid(u, g);
  if (f & f_daemon) {
    if (daemonize())
      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");
    while (optind < argc)
      u_quotify(&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	*
	3	* Client for TrIPE
	4	*
	5	* (c) 2001 Straylight/Edgeware
	6	*/
	7
e04c2d50	8	/----- Licensing notice --------------------------------------------------
410c8acf	9	*
	10	* This file is part of Trivial IP Encryption (TrIPE).
	11	*
	12	* TrIPE is free software; you can redistribute it and/or modify
	13	* it under the terms of the GNU General Public License as published by
	14	* the Free Software Foundation; either version 2 of the License, or
	15	* (at your option) any later version.
e04c2d50	16	*
410c8acf	17	* TrIPE is distributed in the hope that it will be useful,
	18	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	20	* GNU General Public License for more details.
e04c2d50	21	*
410c8acf	22	* You should have received a copy of the GNU General Public License
	23	* along with TrIPE; if not, write to the Free Software Foundation,
	24	* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	25	*/
	26
410c8acf	27	/----- Header files ------------------------------------------------------/
410c8acf	28
73189848	29	#include "config.h"
73189848	30
410c8acf	31	#include <ctype.h>
	32	#include <errno.h>
	33	#include <signal.h>
	34	#include <stdio.h>
	35	#include <stdlib.h>
	36	#include <string.h>
	37	#include <time.h>
	38
	39	#include <sys/types.h>
	40	#include <sys/time.h>
	41	#include <unistd.h>
	42	#include <fcntl.h>
	43	#include <sys/wait.h>
	44	#include <syslog.h>
	45
	46	#include <sys/socket.h>
	47	#include <sys/un.h>
	48	#include <arpa/inet.h>
	49	#include <netdb.h>
	50
	51	#include <mLib/alloc.h>
19dd2531	52	#include <mLib/daemonize.h>
410c8acf	53	#include <mLib/darray.h>
410c8acf	54	#include <mLib/dstr.h>
410c8acf	55	#include <mLib/mdwopt.h>
	56	#include <mLib/quis.h>
	57	#include <mLib/report.h>
	58	#include <mLib/sel.h>
	59	#include <mLib/selbuf.h>
5f5150b1	60	#include <mLib/sig.h>
410c8acf	61	#include <mLib/str.h>
19dd2531	62	#include <mLib/versioncmp.h>
410c8acf	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;
de014da6	82	static const char *bgtag = 0;
410c8acf	83
	84	#define f_bogus 1u
	85	#define f_spawn 2u
	86	#define f_daemon 4u
	87	#define f_spawnopts 8u
	88	#define f_syslog 16u
	89	#define f_command 32u
	90	#define f_noinput 64u
	91	#define f_warn 128u
	92	#define f_uclose 256u
	93
	94	/----- Main code ---------------------------------------------------------/
	95
	96	static void reap(int sig)
	97	{
410c8acf	98	int e = errno;
06b2a088	99	while (waitpid(-1, 0, WNOHANG) > 0)
410c8acf	100	;
	101	errno = e;
	102	}
	103
	104	static void writelog(const char cat, const char msg)
	105	{
	106	char buf[256];
	107	time_t t = time(0);
	108	struct tm *tm = localtime(&t);
	109	strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", tm);
	110	fprintf(logfp, "%s %s: %s\n", buf, cat, msg);
	111	}
	112
de014da6	113	static void checkbg(char **p)
	114	{
	115	char *q = str_getword(p);
	116	if (!q)
	117	die(EXIT_FAILURE, "missing background tag");
	118	if (!bgtag \|\| strcmp(bgtag, q) != 0)
	119	die(EXIT_FAILURE, "unexpected background tag `%s'", q);
	120	}
	121
	122	static void checkfg(void)
6047fbac	123	{ if (bgtag) die(EXIT_FAILURE, "unexpected foreground response"); }
de014da6	124
6be88c14	125	static void cline(char p, size_t len, void b)
410c8acf	126	{
	127	char *q;
	128	if (!p) {
	129	if (f & f_command)
	130	die(EXIT_FAILURE, "server dropped the connection");
	131	exit(0);
	132	}
	133	q = str_getword(&p);
	134	if (!q)
	135	return;
	136	if (strcmp(q, "WARN") == 0) {
	137	if (f & f_syslog)
	138	syslog(LOG_WARNING, "%s", p);
	139	if (logfp)
	140	writelog("warning", p);
	141	if (f & f_warn)
	142	fprintf(stderr, "Warning: %s\n", p);
	143	} else if (strcmp(q, "TRACE") == 0) {
	144	if (f & f_syslog)
	145	syslog(LOG_DEBUG, "%s", p);
	146	if (logfp)
	147	writelog("debug", p);
	148	} else if (!(f & f_command)) {
	149	if (f & f_syslog)
	150	syslog(LOG_ERR, "unexpected output `%s %s'", q, p);
	151	if (logfp) {
	152	dstr d = DSTR_INIT;
	153	dstr_putf(&d, "unexpected output `%s %s'", q, p);
	154	writelog("error", d.buf);
	155	dstr_destroy(&d);
	156	}
de014da6	157	} else if (strcmp(q, "FAIL") == 0) {
de014da6	158	checkfg();
410c8acf	159	die(EXIT_FAILURE, "%s", p);
de014da6	160	} else if (strcmp(q, "INFO") == 0) {
de014da6	161	checkfg();
410c8acf	162	puts(p);
5136c31e	163	fflush(stdout);
de014da6	164	} else if (strcmp(q, "OK") == 0) {
	165	checkfg();
	166	exit(0);
	167	} else if (strcmp(q, "BGDETACH") == 0) {
	168	if (bgtag)
	169	die(EXIT_FAILURE, "repeat detach");
	170	bgtag = xstrdup(p);
	171	} else if (strcmp(q, "BGOK") == 0) {
	172	checkbg(&p);
410c8acf	173	exit(0);
de014da6	174	} else if (strcmp(q, "BGINFO") == 0) {
	175	checkbg(&p);
	176	puts(p);
5136c31e	177	fflush(stdout);
de014da6	178	} else if (strcmp(q, "BGFAIL") == 0) {
	179	checkbg(&p);
	180	die(EXIT_FAILURE, "%s", p);
	181	} else
e04c2d50	182	die(EXIT_FAILURE, "unexpected output `%s %s'", q, p);
410c8acf	183	}
410c8acf	184
6be88c14	185	static void sline(char p, size_t len, void b)
410c8acf	186	{
	187	if (!p) {
	188	if (!(f & f_uclose))
	189	moan("server closed the connection");
	190	exit(0);
	191	}
	192	puts(p);
5136c31e	193	fflush(stdout);
410c8acf	194	}
410c8acf	195
6be88c14	196	static void uline(char p, size_t len, void b)
410c8acf	197	{
410c8acf	198	if (!p) {
	199	selbuf_destroy(b);
	200	shutdown(fd, 1);
	201	f \|= f_uclose;
	202	} else {
6be88c14	203	p[len] = '\n';
3cdc3f3a	204	errno = EIO;
	205	if (write(fd, p, len + 1) != len + 1)
	206	moan("write failed: %s", strerror(errno));
	207	}
	208	}
	209
	210	static void setup(const char *cmd)
	211	{
	212	dstr d = DSTR_INIT;
	213	char ch;
	214	char p, q;
	215	int n;
	216
	217	dstr_puts(&d, cmd);
	218	dstr_putc(&d, '\n');
	219	errno = EIO; /* Relax: be vague */
	220	if (write(fd, d.buf, d.len) != d.len) {
	221	die(EXIT_FAILURE, "error sending setup command `%s': %s",
	222	cmd, strerror(errno));
	223	}
	224	dstr_reset(&d);
	225	for (;;) {
	226	n = read(fd, &ch, 1);
	227	if (!n)
	228	die(EXIT_FAILURE, "unexpected EOF during setup");
	229	if (n < 0) {
	230	die(EXIT_FAILURE, "error receiving reply to `%s': %s",
	231	cmd, strerror(errno));
	232	}
	233	if (d.len < 256)
	234	dstr_putc(&d, ch);
	235	if (ch == '\n') {
	236	p = d.buf;
	237	q = str_getword(&p);
	238	if (!q)
	239	;
	240	else if (strcmp(q, "OK") == 0)
	241	return;
	242	else if (strcmp(q, "FAIL") == 0)
	243	die(EXIT_FAILURE, "setup command `%s' failed: %s", cmd, p);
	244	dstr_reset(&d);
	245	}
410c8acf	246	}
	247	}
	248
9dd01bc6	249	static void logfile(const char *name)
9dd01bc6	250	{
fa4bef80	251	FILE *fp;
	252
	253	if ((fp = fopen(name, "a")) != 0) {
	254	if (logfp)
	255	fclose(logfp);
	256	logfp = fp;
	257	setvbuf(logfp, 0, _IOLBF, BUFSIZ);
	258	} else {
	259	dstr d = DSTR_INIT;
	260	dstr_putf(&d, "error opening logfile `%s': %s", name, strerror(errno));
	261	if (logfp)
	262	writelog("error", d.buf);
	263	else if (logname)
	264	die(EXIT_FAILURE, d.buf);
	265	if (f & f_syslog)
	266	syslog(LOG_ERR, d.buf);
	267	dstr_destroy(&d);
9dd01bc6	268	}
9dd01bc6	269	}
9dd01bc6	270
f98df549	271	static void sighup(int sig, void *v) { logfile(logname); }
5f5150b1	272
6047fbac	273	static void cleanup(void) { if (pidfile) unlink(pidfile); }
06b2a088	274
06b2a088	275	static void sigdie(int sig)
6047fbac	276	{ cleanup(); signal(sig, SIG_DFL); raise(sig); }
06b2a088	277
f685e692 MW	278	static void putarg(string_v av, const char fmt, ...)
	279	{
	280	va_list ap;
	281	dstr d = DSTR_INIT;
	282
	283	va_start(ap, fmt);
	284	dstr_vputf(&d, fmt, &ap);
	285	dstr_putz(&d);
	286	va_end(ap);
	287	DA_UNSHIFT(av, xstrdup(d.buf));
	288	dstr_destroy(&d);
	289	}
	290
410c8acf	291	static void version(FILE *fp)
f98df549	292	{ pquis(fp, "$, TrIPE version " VERSION "\n"); }
410c8acf	293
	294	static void usage(FILE *fp)
	295	{
	296	pquis(fp, "\
	297	Usage:\n\
2d752320	298	$ [-w] [-OPTIONS] [COMMAND [ARGS]...]\n\
2d752320	299	$ [-Dl] [-f FILE] [-OPTIONS]\n\
410c8acf	300	Options:\n\
2d752320	301	[-s] [-d DIRECTORY] [-a SOCKET] [-P PIDFILE]\n\
2d752320	302	[-p PROGRAM] [-S ARG,ARG,...]\n\
410c8acf	303	");
	304	}
	305
	306	static void help(FILE *fp)
	307	{
	308	version(fp);
	309	fputc('\n', fp);
	310	usage(fp);
	311	fputs("\
	312	\n\
	313	Options in full:\n\
	314	\n\
	315	-h, --help Show this help text.\n\
	316	-v, --version Show version number.\n\
	317	-u, --usage Show brief usage message.\n\
	318	\n\
	319	-D, --daemon Become a background task after connecting.\n\
ef4a1ab7	320	-d, --directory=DIR Select current directory [default " CONFIGDIR "].\n\
ab46a787 MW	321	-U, --setuid=USER Set uid to USER after initialization.\n\
ab46a787 MW	322	-G, --setgid=GROUP Set gid to GROUP after initialization.\n\
3cdc3f3a	323	-a, --admin-socket=FILE Select socket to connect to\n\
e04c2d50	324	[default " SOCKETDIR "/tripesock].\n\
06b2a088	325	-P, --pidfile=FILE Write process-id to FILE.\n\
410c8acf	326	\n\
	327	-s, --spawn Start server rather than connecting.\n\
	328	-p, --spawn-path=PATH Specify path to executable.\n\
	329	-S, --spawn-args=ARGS Specify comma-separated arguments.\n\
	330	\n\
	331	-l, --syslog Log messages to system log.\n\
	332	-f, --logfile=FILE Log messages to FILE.\n\
	333	-w, --warnings Show warnings when running commands.\n\
	334	", fp);
	335	}
	336
	337	int main(int argc, char *argv[])
	338	{
ef4a1ab7	339	const char *dir = CONFIGDIR;
ef4a1ab7	340	const char *sock = SOCKETDIR "/tripesock";
410c8acf	341	const char *spawnpath = "tripe";
	342	string_v spawnopts = DA_INIT;
	343	char *p;
06b2a088	344	FILE *pidfp = 0;
ab46a787 MW	345	uid_t u = -1;
ab46a787 MW	346	gid_t g = -1;
410c8acf	347
	348	ego(argv[0]);
	349
	350	if ((p = getenv("TRIPEDIR")) != 0)
	351	dir = p;
797cf76b MW	352	if ((p = getenv("TRIPESOCK")) != 0)
797cf76b MW	353	sock = p;
410c8acf	354
	355	/* --- Parse the arguments --- */
	356
	357	for (;;) {
	358	static const struct option opts[] = {
	359	{ "help", 0, 0, 'h' },
	360	{ "version", 0, 0, 'v' },
	361	{ "usage", 0, 0, 'u' },
	362	{ "daemon", 0, 0, 'D' },
ab46a787 MW	363	{ "uid", OPTF_ARGREQ, 0, 'U' },
	364	{ "setuid", OPTF_ARGREQ, 0, 'U' },
	365	{ "gid", OPTF_ARGREQ, 0, 'G' },
	366	{ "setgid", OPTF_ARGREQ, 0, 'G' },
410c8acf	367	{ "directory", OPTF_ARGREQ, 0, 'd' },
	368	{ "admin-socket", OPTF_ARGREQ, 0, 'a' },
	369	{ "spawn", 0, 0, 's' },
	370	{ "spawn-path", OPTF_ARGREQ, 0, 'p' },
	371	{ "spawn-args", OPTF_ARGREQ, 0, 'S' },
	372	{ "syslog", 0, 0, 'l' },
	373	{ "logfile", OPTF_ARGREQ, 0, 'f' },
	374	{ "warnings", 0, 0, 'w' },
06b2a088	375	{ "pidfile", OPTF_ARGREQ, 0, 'P' },
410c8acf	376	{ 0, 0, 0, 0 }
	377	};
	378
ab46a787	379	int i = mdwopt(argc, argv, "+hvuDU:G:d:a:sp:S:lwf:nP:", opts, 0, 0, 0);
410c8acf	380	if (i < 0)
	381	break;
	382	switch (i) {
	383	case 'h':
	384	help(stdout);
	385	exit(0);
	386	case 'v':
	387	version(stdout);
	388	exit(0);
	389	case 'u':
	390	usage(stdout);
	391	exit(0);
	392	case 'D':
	393	f \|= f_daemon \| f_noinput;
	394	break;
ab46a787 MW	395	case 'U':
	396	u = u_getuser(optarg, &g);
	397	break;
	398	case 'G':
	399	g = u_getgroup(optarg);
	400	break;
410c8acf	401	case 'd':
	402	dir = optarg;
	403	break;
	404	case 'a':
	405	sock = optarg;
	406	break;
	407	case 's':
	408	f \|= f_spawn;
	409	break;
	410	case 'p':
	411	f \|= f_spawn;
	412	spawnpath = optarg;
	413	break;
	414	case 'S':
	415	f \|= f_spawn \| f_spawnopts;
	416	for (p = strtok(optarg, ","); p; p = strtok(0, ","))
	417	DA_PUSH(&spawnopts, p);
	418	break;
	419	case 'l':
	420	f \|= f_syslog \| f_noinput;
	421	break;
	422	case 'w':
	423	f \|= f_warn;
	424	break;
	425	case 'f':
9dd01bc6	426	logname = optarg;
410c8acf	427	f \|= f_noinput;
410c8acf	428	break;
06b2a088	429	case 'P':
	430	pidfile = optarg;
	431	break;
410c8acf	432	default:
	433	f \|= f_bogus;
	434	break;
	435	}
	436	}
	437	if ((f & f_bogus) \|\| ((f & f_noinput) && optind < argc)) {
	438	usage(stderr);
	439	exit(EXIT_FAILURE);
	440	}
	441
06b2a088	442	/* --- Set various things up --- */
	443
	444	if (chdir(dir)) {
	445	die(EXIT_FAILURE, "couldn't set `%s' as current directory: %s",
	446	dir, strerror(errno));
	447	}
	448	if (logname)
	449	logfile(logname);
	450	if (!pidfile && (f & f_daemon) && ((f & f_syslog) \|\| logname))
	451	pidfile = "tripectl.pid";
	452	if (pidfile && (pidfp = fopen(pidfile, "w")) == 0) {
	453	die(EXIT_FAILURE, "couldn't open `%s' for writing: %s",
	454	pidfile, strerror(errno));
	455	}
	456	signal(SIGINT, sigdie);
	457	signal(SIGQUIT, sigdie);
	458	signal(SIGTERM, sigdie);
	459	atexit(cleanup);
	460
410c8acf	461	/* --- Connect to the server --- */
	462
	463	if (f & f_spawn) {
	464	int pfd[2];
	465	pid_t kid;
	466	struct sigaction sa;
	467	sigset_t newmask, oldmask;
	468
	469	sa.sa_handler = reap;
	470	sigemptyset(&sa.sa_mask);
	471	sa.sa_flags = SA_NOCLDSTOP;
	472	#ifdef SA_RESTART
	473	sa.sa_flags \|= SA_RESTART;
	474	#endif
	475	sigaction(SIGCHLD, &sa, 0);
	476
410c8acf	477	DA_PUSH(&spawnopts, 0);
ab46a787 MW	478	if (g != (gid_t)-1) putarg(&spawnopts, "-G%lu", (unsigned long)g);
ab46a787 MW	479	if (u != (uid_t)-1) putarg(&spawnopts, "-U%lu", (unsigned long)u);
f685e692 MW	480	putarg(&spawnopts, "-a%s", sock);
	481	putarg(&spawnopts, "-d.");
	482	putarg(&spawnopts, "-F");
	483	putarg(&spawnopts, "%s", spawnpath);
410c8acf	484	if (socketpair(PF_UNIX, SOCK_STREAM, 0, pfd))
	485	die(EXIT_FAILURE, "error from socketpair: %s", strerror(errno));
	486	sigemptyset(&newmask);
	487	sigaddset(&newmask, SIGCHLD);
	488	sigprocmask(SIG_BLOCK, &newmask, &oldmask);
	489	if ((kid = fork()) < 0)
	490	die(EXIT_FAILURE, "fork failed: %s", strerror(errno));
	491	if (!kid) {
	492	dup2(pfd[1], STDIN_FILENO);
	493	dup2(pfd[1], STDOUT_FILENO);
410c8acf	494	close(pfd[0]);
6047fbac MW	495	close(pfd[1]);
	496	if (logfp) fclose(logfp);
	497	if (pidfp) fclose(pidfp);
9dd01bc6	498	closelog();
6047fbac	499	if (f & f_daemon) detachtty();
410c8acf	500	execvp(DA(&spawnopts)[0], DA(&spawnopts));
	501	die(127, "couldn't exec `%s': %s", spawnpath, strerror(errno));
	502	}
	503	sigprocmask(SIG_SETMASK, &oldmask, 0);
	504	fd = pfd[0];
	505	close(pfd[1]);
	506	} else {
	507	struct sockaddr_un sun;
	508	size_t sz = strlen(sock) + 1;
06b2a088	509	if (sz > sizeof(sun.sun_path))
410c8acf	510	die(EXIT_FAILURE, "socket name `%s' too long", sock);
	511	memset(&sun, 0, sizeof(sun));
	512	sun.sun_family = AF_UNIX;
06b2a088	513	memcpy(sun.sun_path, sock, sz);
06b2a088	514	sz = sz + offsetof(struct sockaddr_un, sun_path);
410c8acf	515	if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
	516	die(EXIT_FAILURE, "error making socket: %s", strerror(errno));
	517	if (connect(fd, (struct sockaddr *)&sun, sz)) {
	518	die(EXIT_FAILURE, "error connecting to `%s': %s",
9dd01bc6	519	sun.sun_path, strerror(errno));
410c8acf	520	}
	521	}
	522
ab46a787	523	u_setugid(u, g);
410c8acf	524	if (f & f_daemon) {
19dd2531	525	if (daemonize())
410c8acf	526	die(EXIT_FAILURE, "error becoming daemon: %s", strerror(errno));
410c8acf	527	}
06b2a088	528	if (pidfp) {
a803add7	529	fprintf(pidfp, "%li\n", (long)getpid());
06b2a088	530	fclose(pidfp);
06b2a088	531	}
3cdc3f3a	532	signal(SIGPIPE, SIG_IGN);
410c8acf	533
	534	/* --- If we're meant to be interactive, do that --- */
	535
3cdc3f3a	536	if (optind == argc)
3cdc3f3a	537	setup("WATCH -A+tw");
410c8acf	538	if (!(f & f_noinput) && optind == argc) {
	539	sel_state sel;
	540	selbuf bu, bs;
	541
	542	sel_init(&sel);
	543	selbuf_init(&bu, &sel, STDIN_FILENO, uline, &bu);
	544	selbuf_init(&bs, &sel, fd, sline, &bs);
	545	for (;;) {
5f5150b1	546	if (sel_select(&sel) && errno != EINTR && errno != EAGAIN)
410c8acf	547	die(EXIT_FAILURE, "select failed: %s", strerror(errno));
	548	}
	549	}
	550
	551	/* --- If there's a command, submit it --- */
	552
	553	if (optind < argc) {
	554	dstr d = DSTR_INIT;
3cdc3f3a	555	setup((f & f_warn) ? "WATCH -A+w" : "WATCH -A");
0ed0735f MW	556	while (optind < argc)
0ed0735f MW	557	u_quotify(&d, argv[optind++]);
410c8acf	558	dstr_putc(&d, '\n');
3cdc3f3a	559	errno = EIO;
	560	if (write(fd, d.buf, d.len) != d.len \|\| shutdown(fd, 1))
	561	die(EXIT_FAILURE, "write failed: %s", strerror(errno));
410c8acf	562	dstr_destroy(&d);
	563	f \|= f_command;
	564	}
	565
	566	/* --- Pull everything else out of the box --- */
	567
	568	{
5f5150b1	569	sel_state sel;
	570	selbuf b;
	571	sig hup;
	572
	573	sel_init(&sel);
	574	selbuf_init(&b, &sel, fd, cline, 0);
	575
410c8acf	576	if (f & f_syslog)
410c8acf	577	openlog(QUIS, 0, LOG_DAEMON);
9dd01bc6	578	if (logfp) {
5f5150b1	579	sig_init(&sel);
5f5150b1	580	sig_add(&hup, SIGHUP, sighup, 0);
9dd01bc6	581	}
410c8acf	582	for (;;) {
5f5150b1	583	if (sel_select(&sel) && errno != EINTR && errno != EAGAIN)
5f5150b1	584	die(EXIT_FAILURE, "select failed: %s", strerror(errno));
410c8acf	585	}
410c8acf	586	}
	587
	588	return (0);
	589	}
	590
	591	/----- That's all, folks -------------------------------------------------/