[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/macros.h>
#include <mLib/mdup.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 sel_state sel;
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
#define f_losing 512u
#define f_nostamp 1024u

/*----- 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);
  if (f & f_nostamp) buf[0] = 0;
  else 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 PRINTF_LIKE(2, 3) dolog(int prio, const char *msg, ...)
{
  va_list ap;
  dstr d = DSTR_INIT;
  const char *cat;

  va_start(ap, msg);
  dstr_vputf(&d, msg, &ap);
  va_end(ap);
  if (f & f_syslog) syslog(prio, "%s", d.buf);
  if (logfp) {
    switch (prio) {
      case LOG_WARNING: cat = "warning"; break;
      case LOG_DEBUG: cat = "debug"; break;
      case LOG_ERR: cat = "error"; break;
      default: cat = "message"; break;
    }
    writelog(cat, d.buf);
  }
  if (prio == LOG_WARNING && (f & f_warn))
    fprintf(stderr, "Warning: %s\n", d.buf);
  dstr_destroy(&d);
}

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");
    f &= ~f_losing;
    exit(0);
  }
  q = str_getword(&p);
  if (!q)
    return;
  if (strcmp(q, "WARN") == 0)
    dolog(LOG_WARNING, "%s", p);
  else if (strcmp(q, "TRACE") == 0)
    dolog(LOG_DEBUG, "%s", p);
  else if (!(f & f_command))
    dolog(LOG_ERR, "unexpected output `%s %s'", q, p);
  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 eline(char *p, size_t len, void *b)
{
  if (p)
    dolog(LOG_WARNING, "(stderr): %s", p);
  else {
    selbuf_destroy(b);
    close(fd);
  }
}

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 (strcmp(name, "-") == 0)
    logfp = stdout;
  else if (strcmp(name, "!") == 0)
    logfp = stderr;
  else 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, "%s", d.buf);
    if (f & f_syslog)
      syslog(LOG_ERR, "%s", 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 PRINTF_LIKE(2, 3) 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\
-t, --no-timestamp	When logging to a file, don't emit timestamps.\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;
  int i;
  size_t sz;
  uid_t u = -1;
  gid_t g = -1;
  int pfd[2], efd[2];
  mdup_fd md[3];
  pid_t kid;
  struct sigaction sa;
  sigset_t newmask, oldmask;
  struct sockaddr_un sun;
  selbuf bu, bs, be;
  dstr d = DSTR_INIT;
  sig hup;

  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' },
      { "no-timestamp",	0,		0,	't' },
      { "warnings",	0,		0,	'w' },
      { "pidfile",	OPTF_ARGREQ,	0,	'P' },
      { 0,		0,		0,	0 }
    };

    i = mdwopt(argc, argv, "+hvuDU:G:d:a:sp:S:lwf:nP: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 | 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 't':
	f |= f_nostamp;
	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 (!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));
  }
  sel_init(&sel);
  sig_init(&sel);
  signal(SIGINT, sigdie);
  signal(SIGQUIT, sigdie);
  signal(SIGTERM, sigdie);
  atexit(cleanup);

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

  if (f & f_spawn) {
    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) || pipe(efd))
      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) {
      close(pfd[0]); close(efd[0]);
      sigprocmask(SIG_SETMASK, &oldmask, 0);
      md[0].cur = pfd[1]; md[0].want = STDIN_FILENO;
      md[1].cur = pfd[1]; md[1].want = STDOUT_FILENO;
      md[2].cur = efd[1]; md[2].want = STDERR_FILENO;
      mdup(md, 3);
      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]); close(efd[1]);
    selbuf_init(&be, &sel, efd[0], eline, &be);
  } else {
    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));
    }
  }

  f |= f_losing; /* pessimism */
  u_setugid(u, g);
  if (logname)
    logfile(logname);
  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) {
    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) {
    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 --- */

  selbuf_init(&bs, &sel, fd, cline, 0);

  if (f & f_syslog)
    openlog(QUIS, 0, LOG_DAEMON);
  if (logfp)
    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>
ddb384f1	55	#include <mLib/macros.h>
b9537f3b	56	#include <mLib/mdup.h>
410c8acf	57	#include <mLib/mdwopt.h>
	58	#include <mLib/quis.h>
	59	#include <mLib/report.h>
	60	#include <mLib/sel.h>
	61	#include <mLib/selbuf.h>
5f5150b1	62	#include <mLib/sig.h>
410c8acf	63	#include <mLib/str.h>
19dd2531	64	#include <mLib/versioncmp.h>
410c8acf	65
	66	#include "util.h"
	67
	68	#undef sun
	69
	70	/----- Data structures ---------------------------------------------------/
	71
	72	#ifndef STRING_V
	73	# define STRING_V
	74	DA_DECL(string_v, char *);
	75	#endif
	76
	77	/----- Static variables --------------------------------------------------/
	78
8efdf64b	79	static sel_state sel;
06b2a088	80	static const char *pidfile = 0;
06b2a088	81	static const char *logname = 0;
410c8acf	82	static FILE *logfp = 0;
	83	static unsigned f = 0;
	84	static int fd;
de014da6	85	static const char *bgtag = 0;
410c8acf	86
	87	#define f_bogus 1u
	88	#define f_spawn 2u
	89	#define f_daemon 4u
	90	#define f_spawnopts 8u
	91	#define f_syslog 16u
	92	#define f_command 32u
	93	#define f_noinput 64u
	94	#define f_warn 128u
	95	#define f_uclose 256u
1a372224	96	#define f_losing 512u
ae8928d2	97	#define f_nostamp 1024u
410c8acf	98
	99	/----- Main code ---------------------------------------------------------/
	100
	101	static void reap(int sig)
	102	{
410c8acf	103	int e = errno;
06b2a088	104	while (waitpid(-1, 0, WNOHANG) > 0)
410c8acf	105	;
	106	errno = e;
	107	}
	108
	109	static void writelog(const char cat, const char msg)
	110	{
	111	char buf[256];
	112	time_t t = time(0);
	113	struct tm *tm = localtime(&t);
ae8928d2 MW	114	if (f & f_nostamp) buf[0] = 0;
	115	else strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S ", tm);
	116	fprintf(logfp, "%s%s: %s\n", buf, cat, msg);
410c8acf	117	}
410c8acf	118
de014da6	119	static void checkbg(char **p)
	120	{
	121	char *q = str_getword(p);
	122	if (!q)
	123	die(EXIT_FAILURE, "missing background tag");
	124	if (!bgtag \|\| strcmp(bgtag, q) != 0)
	125	die(EXIT_FAILURE, "unexpected background tag `%s'", q);
	126	}
	127
ddb384f1	128	static void PRINTF_LIKE(2, 3) dolog(int prio, const char *msg, ...)
2b3ef395 MW	129	{
	130	va_list ap;
	131	dstr d = DSTR_INIT;
	132	const char *cat;
	133
	134	va_start(ap, msg);
	135	dstr_vputf(&d, msg, &ap);
	136	va_end(ap);
	137	if (f & f_syslog) syslog(prio, "%s", d.buf);
	138	if (logfp) {
	139	switch (prio) {
155a970a	140	case LOG_WARNING: cat = "warning"; break;
2b3ef395 MW	141	case LOG_DEBUG: cat = "debug"; break;
	142	case LOG_ERR: cat = "error"; break;
	143	default: cat = "message"; break;
	144	}
	145	writelog(cat, d.buf);
	146	}
155a970a	147	if (prio == LOG_WARNING && (f & f_warn))
2b3ef395 MW	148	fprintf(stderr, "Warning: %s\n", d.buf);
	149	dstr_destroy(&d);
	150	}
	151
de014da6	152	static void checkfg(void)
6047fbac	153	{ if (bgtag) die(EXIT_FAILURE, "unexpected foreground response"); }
de014da6	154
6be88c14	155	static void cline(char p, size_t len, void b)
410c8acf	156	{
	157	char *q;
	158	if (!p) {
	159	if (f & f_command)
	160	die(EXIT_FAILURE, "server dropped the connection");
1a372224	161	f &= ~f_losing;
410c8acf	162	exit(0);
	163	}
	164	q = str_getword(&p);
	165	if (!q)
	166	return;
2b3ef395	167	if (strcmp(q, "WARN") == 0)
f7a19d39	168	dolog(LOG_WARNING, "%s", p);
2b3ef395	169	else if (strcmp(q, "TRACE") == 0)
f7a19d39	170	dolog(LOG_DEBUG, "%s", p);
2b3ef395 MW	171	else if (!(f & f_command))
	172	dolog(LOG_ERR, "unexpected output `%s %s'", q, p);
	173	else if (strcmp(q, "FAIL") == 0) {
de014da6	174	checkfg();
410c8acf	175	die(EXIT_FAILURE, "%s", p);
de014da6	176	} else if (strcmp(q, "INFO") == 0) {
de014da6	177	checkfg();
410c8acf	178	puts(p);
5136c31e	179	fflush(stdout);
de014da6	180	} else if (strcmp(q, "OK") == 0) {
	181	checkfg();
	182	exit(0);
	183	} else if (strcmp(q, "BGDETACH") == 0) {
	184	if (bgtag)
	185	die(EXIT_FAILURE, "repeat detach");
	186	bgtag = xstrdup(p);
	187	} else if (strcmp(q, "BGOK") == 0) {
	188	checkbg(&p);
410c8acf	189	exit(0);
de014da6	190	} else if (strcmp(q, "BGINFO") == 0) {
	191	checkbg(&p);
	192	puts(p);
5136c31e	193	fflush(stdout);
de014da6	194	} else if (strcmp(q, "BGFAIL") == 0) {
	195	checkbg(&p);
	196	die(EXIT_FAILURE, "%s", p);
	197	} else
e04c2d50	198	die(EXIT_FAILURE, "unexpected output `%s %s'", q, p);
410c8acf	199	}
410c8acf	200
6be88c14	201	static void sline(char p, size_t len, void b)
410c8acf	202	{
	203	if (!p) {
	204	if (!(f & f_uclose))
	205	moan("server closed the connection");
	206	exit(0);
	207	}
	208	puts(p);
5136c31e	209	fflush(stdout);
410c8acf	210	}
410c8acf	211
6be88c14	212	static void uline(char p, size_t len, void b)
410c8acf	213	{
410c8acf	214	if (!p) {
	215	selbuf_destroy(b);
	216	shutdown(fd, 1);
	217	f \|= f_uclose;
	218	} else {
6be88c14	219	p[len] = '\n';
3cdc3f3a	220	errno = EIO;
	221	if (write(fd, p, len + 1) != len + 1)
	222	moan("write failed: %s", strerror(errno));
	223	}
	224	}
	225
155a970a MW	226	static void eline(char p, size_t len, void b)
	227	{
	228	if (p)
	229	dolog(LOG_WARNING, "(stderr): %s", p);
	230	else {
	231	selbuf_destroy(b);
	232	close(fd);
	233	}
	234	}
	235
3cdc3f3a	236	static void setup(const char *cmd)
	237	{
	238	dstr d = DSTR_INIT;
	239	char ch;
	240	char p, q;
	241	int n;
	242
	243	dstr_puts(&d, cmd);
	244	dstr_putc(&d, '\n');
	245	errno = EIO; /* Relax: be vague */
	246	if (write(fd, d.buf, d.len) != d.len) {
	247	die(EXIT_FAILURE, "error sending setup command `%s': %s",
	248	cmd, strerror(errno));
	249	}
	250	dstr_reset(&d);
	251	for (;;) {
	252	n = read(fd, &ch, 1);
	253	if (!n)
	254	die(EXIT_FAILURE, "unexpected EOF during setup");
	255	if (n < 0) {
	256	die(EXIT_FAILURE, "error receiving reply to `%s': %s",
	257	cmd, strerror(errno));
	258	}
	259	if (d.len < 256)
	260	dstr_putc(&d, ch);
	261	if (ch == '\n') {
	262	p = d.buf;
	263	q = str_getword(&p);
	264	if (!q)
	265	;
	266	else if (strcmp(q, "OK") == 0)
	267	return;
	268	else if (strcmp(q, "FAIL") == 0)
	269	die(EXIT_FAILURE, "setup command `%s' failed: %s", cmd, p);
	270	dstr_reset(&d);
	271	}
410c8acf	272	}
	273	}
	274
9dd01bc6	275	static void logfile(const char *name)
9dd01bc6	276	{
fa4bef80	277	FILE *fp;
fa4bef80	278
ae8928d2 MW	279	if (strcmp(name, "-") == 0)
	280	logfp = stdout;
	281	else if (strcmp(name, "!") == 0)
	282	logfp = stderr;
	283	else if ((fp = fopen(name, "a")) != 0) {
fa4bef80	284	if (logfp)
	285	fclose(logfp);
	286	logfp = fp;
	287	setvbuf(logfp, 0, _IOLBF, BUFSIZ);
	288	} else {
	289	dstr d = DSTR_INIT;
	290	dstr_putf(&d, "error opening logfile `%s': %s", name, strerror(errno));
	291	if (logfp)
	292	writelog("error", d.buf);
	293	else if (logname)
f7a19d39	294	die(EXIT_FAILURE, "%s", d.buf);
fa4bef80	295	if (f & f_syslog)
92e57abc	296	syslog(LOG_ERR, "%s", d.buf);
fa4bef80	297	dstr_destroy(&d);
9dd01bc6	298	}
9dd01bc6	299	}
9dd01bc6	300
f98df549	301	static void sighup(int sig, void *v) { logfile(logname); }
5f5150b1	302
6047fbac	303	static void cleanup(void) { if (pidfile) unlink(pidfile); }
06b2a088	304
06b2a088	305	static void sigdie(int sig)
6047fbac	306	{ cleanup(); signal(sig, SIG_DFL); raise(sig); }
06b2a088	307
ddb384f1	308	static void PRINTF_LIKE(2, 3) putarg(string_v av, const char fmt, ...)
f685e692 MW	309	{
	310	va_list ap;
	311	dstr d = DSTR_INIT;
	312
	313	va_start(ap, fmt);
	314	dstr_vputf(&d, fmt, &ap);
	315	dstr_putz(&d);
	316	va_end(ap);
	317	DA_UNSHIFT(av, xstrdup(d.buf));
	318	dstr_destroy(&d);
	319	}
	320
410c8acf	321	static void version(FILE *fp)
f98df549	322	{ pquis(fp, "$, TrIPE version " VERSION "\n"); }
410c8acf	323
	324	static void usage(FILE *fp)
	325	{
	326	pquis(fp, "\
	327	Usage:\n\
2d752320	328	$ [-w] [-OPTIONS] [COMMAND [ARGS]...]\n\
2d752320	329	$ [-Dl] [-f FILE] [-OPTIONS]\n\
410c8acf	330	Options:\n\
2d752320	331	[-s] [-d DIRECTORY] [-a SOCKET] [-P PIDFILE]\n\
2d752320	332	[-p PROGRAM] [-S ARG,ARG,...]\n\
410c8acf	333	");
	334	}
	335
	336	static void help(FILE *fp)
	337	{
	338	version(fp);
	339	fputc('\n', fp);
	340	usage(fp);
	341	fputs("\
	342	\n\
	343	Options in full:\n\
	344	\n\
	345	-h, --help Show this help text.\n\
	346	-v, --version Show version number.\n\
	347	-u, --usage Show brief usage message.\n\
	348	\n\
	349	-D, --daemon Become a background task after connecting.\n\
ef4a1ab7	350	-d, --directory=DIR Select current directory [default " CONFIGDIR "].\n\
ab46a787 MW	351	-U, --setuid=USER Set uid to USER after initialization.\n\
ab46a787 MW	352	-G, --setgid=GROUP Set gid to GROUP after initialization.\n\
3cdc3f3a	353	-a, --admin-socket=FILE Select socket to connect to\n\
e04c2d50	354	[default " SOCKETDIR "/tripesock].\n\
06b2a088	355	-P, --pidfile=FILE Write process-id to FILE.\n\
410c8acf	356	\n\
	357	-s, --spawn Start server rather than connecting.\n\
	358	-p, --spawn-path=PATH Specify path to executable.\n\
	359	-S, --spawn-args=ARGS Specify comma-separated arguments.\n\
	360	\n\
	361	-l, --syslog Log messages to system log.\n\
	362	-f, --logfile=FILE Log messages to FILE.\n\
ae8928d2	363	-t, --no-timestamp When logging to a file, don't emit timestamps.\n\
410c8acf	364	-w, --warnings Show warnings when running commands.\n\
	365	", fp);
	366	}
	367
	368	int main(int argc, char *argv[])
	369	{
ef4a1ab7	370	const char *dir = CONFIGDIR;
ef4a1ab7	371	const char *sock = SOCKETDIR "/tripesock";
410c8acf	372	const char *spawnpath = "tripe";
	373	string_v spawnopts = DA_INIT;
	374	char *p;
06b2a088	375	FILE *pidfp = 0;
8efdf64b MW	376	int i;
8efdf64b MW	377	size_t sz;
ab46a787 MW	378	uid_t u = -1;
ab46a787 MW	379	gid_t g = -1;
155a970a	380	int pfd[2], efd[2];
b9537f3b	381	mdup_fd md[3];
8efdf64b MW	382	pid_t kid;
	383	struct sigaction sa;
	384	sigset_t newmask, oldmask;
	385	struct sockaddr_un sun;
155a970a	386	selbuf bu, bs, be;
8efdf64b MW	387	dstr d = DSTR_INIT;
8efdf64b MW	388	sig hup;
410c8acf	389
	390	ego(argv[0]);
	391
	392	if ((p = getenv("TRIPEDIR")) != 0)
	393	dir = p;
797cf76b MW	394	if ((p = getenv("TRIPESOCK")) != 0)
797cf76b MW	395	sock = p;
410c8acf	396
	397	/* --- Parse the arguments --- */
	398
	399	for (;;) {
	400	static const struct option opts[] = {
	401	{ "help", 0, 0, 'h' },
	402	{ "version", 0, 0, 'v' },
	403	{ "usage", 0, 0, 'u' },
	404	{ "daemon", 0, 0, 'D' },
ab46a787 MW	405	{ "uid", OPTF_ARGREQ, 0, 'U' },
	406	{ "setuid", OPTF_ARGREQ, 0, 'U' },
	407	{ "gid", OPTF_ARGREQ, 0, 'G' },
	408	{ "setgid", OPTF_ARGREQ, 0, 'G' },
410c8acf	409	{ "directory", OPTF_ARGREQ, 0, 'd' },
	410	{ "admin-socket", OPTF_ARGREQ, 0, 'a' },
	411	{ "spawn", 0, 0, 's' },
	412	{ "spawn-path", OPTF_ARGREQ, 0, 'p' },
	413	{ "spawn-args", OPTF_ARGREQ, 0, 'S' },
	414	{ "syslog", 0, 0, 'l' },
	415	{ "logfile", OPTF_ARGREQ, 0, 'f' },
ae8928d2	416	{ "no-timestamp", 0, 0, 't' },
410c8acf	417	{ "warnings", 0, 0, 'w' },
06b2a088	418	{ "pidfile", OPTF_ARGREQ, 0, 'P' },
410c8acf	419	{ 0, 0, 0, 0 }
	420	};
	421
ae8928d2	422	i = mdwopt(argc, argv, "+hvuDU:G:d:a:sp:S:lwf:nP:t", opts, 0, 0, 0);
410c8acf	423	if (i < 0)
	424	break;
	425	switch (i) {
	426	case 'h':
	427	help(stdout);
	428	exit(0);
	429	case 'v':
	430	version(stdout);
	431	exit(0);
	432	case 'u':
	433	usage(stdout);
	434	exit(0);
	435	case 'D':
	436	f \|= f_daemon \| f_noinput;
	437	break;
ab46a787 MW	438	case 'U':
	439	u = u_getuser(optarg, &g);
	440	break;
	441	case 'G':
	442	g = u_getgroup(optarg);
	443	break;
410c8acf	444	case 'd':
	445	dir = optarg;
	446	break;
	447	case 'a':
	448	sock = optarg;
	449	break;
	450	case 's':
	451	f \|= f_spawn;
	452	break;
	453	case 'p':
	454	f \|= f_spawn;
	455	spawnpath = optarg;
	456	break;
	457	case 'S':
	458	f \|= f_spawn \| f_spawnopts;
	459	for (p = strtok(optarg, ","); p; p = strtok(0, ","))
	460	DA_PUSH(&spawnopts, p);
	461	break;
	462	case 'l':
	463	f \|= f_syslog \| f_noinput;
	464	break;
	465	case 'w':
	466	f \|= f_warn;
	467	break;
	468	case 'f':
9dd01bc6	469	logname = optarg;
410c8acf	470	f \|= f_noinput;
410c8acf	471	break;
ae8928d2 MW	472	case 't':
	473	f \|= f_nostamp;
	474	break;
06b2a088	475	case 'P':
	476	pidfile = optarg;
	477	break;
410c8acf	478	default:
	479	f \|= f_bogus;
	480	break;
	481	}
	482	}
	483	if ((f & f_bogus) \|\| ((f & f_noinput) && optind < argc)) {
	484	usage(stderr);
	485	exit(EXIT_FAILURE);
	486	}
	487
06b2a088	488	/* --- Set various things up --- */
	489
	490	if (chdir(dir)) {
	491	die(EXIT_FAILURE, "couldn't set `%s' as current directory: %s",
	492	dir, strerror(errno));
	493	}
06b2a088	494	if (!pidfile && (f & f_daemon) && ((f & f_syslog) \|\| logname))
	495	pidfile = "tripectl.pid";
	496	if (pidfile && (pidfp = fopen(pidfile, "w")) == 0) {
	497	die(EXIT_FAILURE, "couldn't open `%s' for writing: %s",
	498	pidfile, strerror(errno));
	499	}
8efdf64b MW	500	sel_init(&sel);
8efdf64b MW	501	sig_init(&sel);
06b2a088	502	signal(SIGINT, sigdie);
	503	signal(SIGQUIT, sigdie);
	504	signal(SIGTERM, sigdie);
	505	atexit(cleanup);
	506
410c8acf	507	/* --- Connect to the server --- */
	508
	509	if (f & f_spawn) {
410c8acf	510	sa.sa_handler = reap;
	511	sigemptyset(&sa.sa_mask);
	512	sa.sa_flags = SA_NOCLDSTOP;
	513	#ifdef SA_RESTART
	514	sa.sa_flags \|= SA_RESTART;
	515	#endif
	516	sigaction(SIGCHLD, &sa, 0);
	517
410c8acf	518	DA_PUSH(&spawnopts, 0);
ab46a787 MW	519	if (g != (gid_t)-1) putarg(&spawnopts, "-G%lu", (unsigned long)g);
ab46a787 MW	520	if (u != (uid_t)-1) putarg(&spawnopts, "-U%lu", (unsigned long)u);
f685e692 MW	521	putarg(&spawnopts, "-a%s", sock);
	522	putarg(&spawnopts, "-d.");
	523	putarg(&spawnopts, "-F");
	524	putarg(&spawnopts, "%s", spawnpath);
155a970a	525	if (socketpair(PF_UNIX, SOCK_STREAM, 0, pfd) \|\| pipe(efd))
410c8acf	526	die(EXIT_FAILURE, "error from socketpair: %s", strerror(errno));
	527	sigemptyset(&newmask);
	528	sigaddset(&newmask, SIGCHLD);
	529	sigprocmask(SIG_BLOCK, &newmask, &oldmask);
	530	if ((kid = fork()) < 0)
	531	die(EXIT_FAILURE, "fork failed: %s", strerror(errno));
	532	if (!kid) {
b9537f3b	533	close(pfd[0]); close(efd[0]);
0dba5cb9	534	sigprocmask(SIG_SETMASK, &oldmask, 0);
b9537f3b MW	535	md[0].cur = pfd[1]; md[0].want = STDIN_FILENO;
	536	md[1].cur = pfd[1]; md[1].want = STDOUT_FILENO;
	537	md[2].cur = efd[1]; md[2].want = STDERR_FILENO;
	538	mdup(md, 3);
6047fbac	539	if (pidfp) fclose(pidfp);
9dd01bc6	540	closelog();
6047fbac	541	if (f & f_daemon) detachtty();
410c8acf	542	execvp(DA(&spawnopts)[0], DA(&spawnopts));
	543	die(127, "couldn't exec `%s': %s", spawnpath, strerror(errno));
	544	}
	545	sigprocmask(SIG_SETMASK, &oldmask, 0);
	546	fd = pfd[0];
155a970a MW	547	close(pfd[1]); close(efd[1]);
155a970a MW	548	selbuf_init(&be, &sel, efd[0], eline, &be);
410c8acf	549	} else {
8efdf64b	550	sz = strlen(sock) + 1;
06b2a088	551	if (sz > sizeof(sun.sun_path))
410c8acf	552	die(EXIT_FAILURE, "socket name `%s' too long", sock);
	553	memset(&sun, 0, sizeof(sun));
	554	sun.sun_family = AF_UNIX;
06b2a088	555	memcpy(sun.sun_path, sock, sz);
06b2a088	556	sz = sz + offsetof(struct sockaddr_un, sun_path);
410c8acf	557	if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
	558	die(EXIT_FAILURE, "error making socket: %s", strerror(errno));
	559	if (connect(fd, (struct sockaddr *)&sun, sz)) {
	560	die(EXIT_FAILURE, "error connecting to `%s': %s",
9dd01bc6	561	sun.sun_path, strerror(errno));
410c8acf	562	}
	563	}
	564
1a372224	565	f \|= f_losing; /* pessimism */
ab46a787	566	u_setugid(u, g);
1a372224 MW	567	if (logname)
1a372224 MW	568	logfile(logname);
410c8acf	569	if (f & f_daemon) {
19dd2531	570	if (daemonize())
410c8acf	571	die(EXIT_FAILURE, "error becoming daemon: %s", strerror(errno));
410c8acf	572	}
06b2a088	573	if (pidfp) {
a803add7	574	fprintf(pidfp, "%li\n", (long)getpid());
06b2a088	575	fclose(pidfp);
06b2a088	576	}
3cdc3f3a	577	signal(SIGPIPE, SIG_IGN);
410c8acf	578
	579	/* --- If we're meant to be interactive, do that --- */
	580
3cdc3f3a	581	if (optind == argc)
3cdc3f3a	582	setup("WATCH -A+tw");
410c8acf	583	if (!(f & f_noinput) && optind == argc) {
410c8acf	584	selbuf_init(&bu, &sel, STDIN_FILENO, uline, &bu);
	585	selbuf_init(&bs, &sel, fd, sline, &bs);
	586	for (;;) {
5f5150b1	587	if (sel_select(&sel) && errno != EINTR && errno != EAGAIN)
410c8acf	588	die(EXIT_FAILURE, "select failed: %s", strerror(errno));
	589	}
	590	}
	591
	592	/* --- If there's a command, submit it --- */
	593
	594	if (optind < argc) {
3cdc3f3a	595	setup((f & f_warn) ? "WATCH -A+w" : "WATCH -A");
0ed0735f MW	596	while (optind < argc)
0ed0735f MW	597	u_quotify(&d, argv[optind++]);
410c8acf	598	dstr_putc(&d, '\n');
3cdc3f3a	599	errno = EIO;
	600	if (write(fd, d.buf, d.len) != d.len \|\| shutdown(fd, 1))
	601	die(EXIT_FAILURE, "write failed: %s", strerror(errno));
410c8acf	602	dstr_destroy(&d);
	603	f \|= f_command;
	604	}
	605
	606	/* --- Pull everything else out of the box --- */
	607
8efdf64b	608	selbuf_init(&bs, &sel, fd, cline, 0);
5f5150b1	609
8efdf64b MW	610	if (f & f_syslog)
	611	openlog(QUIS, 0, LOG_DAEMON);
	612	if (logfp)
	613	sig_add(&hup, SIGHUP, sighup, 0);
	614	for (;;) {
	615	if (sel_select(&sel) && errno != EINTR && errno != EAGAIN)
	616	die(EXIT_FAILURE, "select failed: %s", strerror(errno));
410c8acf	617	}
	618
	619	return (0);
	620	}
	621
	622	/----- That's all, folks -------------------------------------------------/