1/*-
2 * Copyright (c) 1998 Brian Somers <brian@Awfulhak.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: src/usr.sbin/ppp/chat.c,v 1.80.26.1 2010/12/21 17:10:29 kensmith Exp $
27 */
28
29#include <sys/param.h>
30#include <netinet/in.h>
31#include <netinet/in_systm.h>
32#include <netinet/ip.h>
33#include <sys/socket.h>
34#include <sys/un.h>
35
36#include <errno.h>
37#include <fcntl.h>
38#include <paths.h>
39#include <stdio.h>
40#include <stdlib.h>
41#include <string.h>
42#include <sys/wait.h>
43#include <termios.h>
44#include <unistd.h>
45
46#include "layer.h"
47#include "mbuf.h"
48#include "log.h"
49#include "defs.h"
50#include "timer.h"
51#include "lqr.h"
52#include "hdlc.h"
53#include "throughput.h"
54#include "fsm.h"
55#include "lcp.h"
56#include "ccp.h"
57#include "link.h"
58#include "async.h"
59#include "descriptor.h"
60#include "physical.h"
61#include "chat.h"
62#include "mp.h"
63#include "auth.h"
64#include "chap.h"
65#include "slcompress.h"
66#include "iplist.h"
67#include "ncpaddr.h"
68#include "ipcp.h"
69#include "filter.h"
70#include "cbcp.h"
71#include "command.h"
72#include "datalink.h"
73#ifndef NORADIUS
74#include "radius.h"
75#endif
76#include "ipv6cp.h"
77#include "ncp.h"
78#include "bundle.h"
79#include "id.h"
80
81#define BUFLEFT(c) (sizeof (c)->buf - ((c)->bufend - (c)->buf))
82
83static void ExecStr(struct physical *, char *, char *, int);
84static char *ExpandString(struct chat *, const char *, char *, int, int);
85
86static void
87chat_PauseTimer(void *v)
88{
89  struct chat *c = (struct chat *)v;
90  timer_Stop(&c->pause);
91  c->pause.load = 0;
92}
93
94static void
95chat_Pause(struct chat *c, u_long load)
96{
97  timer_Stop(&c->pause);
98  c->pause.load += load;
99  c->pause.func = chat_PauseTimer;
100  c->pause.name = "chat pause";
101  c->pause.arg = c;
102  timer_Start(&c->pause);
103}
104
105static void
106chat_TimeoutTimer(void *v)
107{
108  struct chat *c = (struct chat *)v;
109  timer_Stop(&c->timeout);
110  c->TimedOut = 1;
111}
112
113static void
114chat_SetTimeout(struct chat *c)
115{
116  timer_Stop(&c->timeout);
117  if (c->TimeoutSec > 0) {
118    c->timeout.load = SECTICKS * c->TimeoutSec;
119    c->timeout.func = chat_TimeoutTimer;
120    c->timeout.name = "chat timeout";
121    c->timeout.arg = c;
122    timer_Start(&c->timeout);
123  }
124}
125
126static char *
127chat_NextChar(char *ptr, char ch)
128{
129  for (; *ptr; ptr++)
130    if (*ptr == ch)
131      return ptr;
132    else if (*ptr == '\\')
133      if (*++ptr == '\0')
134        return NULL;
135
136  return NULL;
137}
138
139static int
140chat_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
141{
142  struct chat *c = descriptor2chat(d);
143  int special, gotabort, gottimeout, needcr;
144  int TimedOut = c->TimedOut;
145  static char arg_term;		/* An empty string */
146
147  if (c->pause.state == TIMER_RUNNING)
148    return 0;
149
150  if (TimedOut) {
151    log_Printf(LogCHAT, "Expect timeout\n");
152    if (c->nargptr == NULL)
153      c->state = CHAT_FAILED;
154    else {
155      /* c->state = CHAT_EXPECT; */
156      c->argptr = &arg_term;
157    }
158    c->TimedOut = 0;
159  }
160
161  if (c->state != CHAT_EXPECT && c->state != CHAT_SEND)
162    return 0;
163
164  gottimeout = gotabort = 0;
165
166  if (c->arg < c->argc && (c->arg < 0 || *c->argptr == '\0')) {
167    /* Go get the next string */
168    if (c->arg < 0 || c->state == CHAT_SEND)
169      c->state = CHAT_EXPECT;
170    else
171      c->state = CHAT_SEND;
172
173    special = 1;
174    while (special && (c->nargptr || c->arg < c->argc - 1)) {
175      if (c->arg < 0 || (!TimedOut && c->state == CHAT_SEND))
176        c->nargptr = NULL;
177
178      if (c->nargptr != NULL) {
179        /* We're doing expect-send-expect.... */
180        c->argptr = c->nargptr;
181        /* Put the '-' back in case we ever want to rerun our script */
182        c->nargptr[-1] = '-';
183        c->nargptr = chat_NextChar(c->nargptr, '-');
184        if (c->nargptr != NULL)
185          *c->nargptr++ = '\0';
186      } else {
187        int minus;
188
189        if ((c->argptr = c->argv[++c->arg]) == NULL) {
190          /* End of script - all ok */
191          c->state = CHAT_DONE;
192          return 0;
193        }
194
195        if (c->state == CHAT_EXPECT) {
196          /* Look for expect-send-expect sequence */
197          c->nargptr = c->argptr;
198          minus = 0;
199          while ((c->nargptr = chat_NextChar(c->nargptr, '-'))) {
200            c->nargptr++;
201            minus++;
202          }
203
204          if (minus % 2)
205            log_Printf(LogWARN, "chat_UpdateSet: \"%s\": Uneven number of"
206                      " '-' chars, all ignored\n", c->argptr);
207          else if (minus) {
208            c->nargptr = chat_NextChar(c->argptr, '-');
209            *c->nargptr++ = '\0';
210          }
211        }
212      }
213
214      /*
215       * c->argptr now temporarily points into c->script (via c->argv)
216       * If it's an expect-send-expect sequence, we've just got the correct
217       * portion of that sequence.
218       */
219
220      needcr = c->state == CHAT_SEND &&
221               (*c->argptr != '!' || c->argptr[1] == '!');
222
223      /* We leave room for a potential HDLC header in the target string */
224      ExpandString(c, c->argptr, c->exp + 2, sizeof c->exp - 2, needcr);
225
226      /*
227       * Now read our string.  If it's not a special string, we unset
228       * ``special'' to break out of the loop.
229       */
230      if (gotabort) {
231        if (c->abort.num < MAXABORTS) {
232          int len, i;
233
234          len = strlen(c->exp+2);
235          for (i = 0; i < c->abort.num; i++)
236            if (len > c->abort.string[i].len) {
237              int last;
238
239              for (last = c->abort.num; last > i; last--) {
240                c->abort.string[last].data = c->abort.string[last-1].data;
241                c->abort.string[last].len = c->abort.string[last-1].len;
242              }
243              break;
244            }
245          c->abort.string[i].len = len;
246          if ((c->abort.string[i].data = (char *)malloc(len+1)) != NULL) {
247            memcpy(c->abort.string[i].data, c->exp+2, len+1);
248            c->abort.num++;
249	  }
250        } else
251          log_Printf(LogERROR, "chat_UpdateSet: too many abort strings\n");
252        gotabort = 0;
253      } else if (gottimeout) {
254        c->TimeoutSec = atoi(c->exp + 2);
255        if (c->TimeoutSec <= 0)
256          c->TimeoutSec = 30;
257        gottimeout = 0;
258      } else if (c->nargptr == NULL && !strcmp(c->exp+2, "ABORT"))
259        gotabort = 1;
260      else if (c->nargptr == NULL && !strcmp(c->exp+2, "TIMEOUT"))
261        gottimeout = 1;
262      else {
263        if (c->exp[2] == '!' && c->exp[3] != '!')
264          ExecStr(c->physical, c->exp + 3, c->exp + 3, sizeof c->exp - 3);
265
266        if (c->exp[2] == '\0') {
267          /* Empty string, reparse (this may be better as a `goto start') */
268          c->argptr = &arg_term;
269          return chat_UpdateSet(d, r, w, e, n);
270        }
271
272        special = 0;
273      }
274    }
275
276    if (special) {
277      if (gottimeout)
278        log_Printf(LogWARN, "chat_UpdateSet: TIMEOUT: Argument expected\n");
279      else if (gotabort)
280        log_Printf(LogWARN, "chat_UpdateSet: ABORT: Argument expected\n");
281
282      /* End of script - all ok */
283      c->state = CHAT_DONE;
284      return 0;
285    }
286
287    /* set c->argptr to point in the right place */
288    c->argptr = c->exp + (c->exp[2] == '!' ? 3 : 2);
289    c->arglen = strlen(c->argptr);
290
291    if (c->state == CHAT_EXPECT) {
292      /* We must check to see if the string's already been found ! */
293      char *begin, *end;
294
295      end = c->bufend - c->arglen + 1;
296      if (end < c->bufstart)
297        end = c->bufstart;
298      for (begin = c->bufstart; begin < end; begin++)
299        if (!strncmp(begin, c->argptr, c->arglen)) {
300          c->bufstart = begin + c->arglen;
301          c->argptr += c->arglen;
302          c->arglen = 0;
303          /* Continue - we've already read our expect string */
304          return chat_UpdateSet(d, r, w, e, n);
305        }
306
307      log_Printf(LogCHAT, "Expect(%d): %s\n", c->TimeoutSec, c->argptr);
308      chat_SetTimeout(c);
309    }
310  }
311
312  /*
313   * We now have c->argptr pointing at what we want to expect/send and
314   * c->state saying what we want to do... we now know what to put in
315   * the fd_set :-)
316   */
317
318  if (c->state == CHAT_EXPECT)
319    return physical_doUpdateSet(&c->physical->desc, r, NULL, e, n, 1);
320  else
321    return physical_doUpdateSet(&c->physical->desc, NULL, w, e, n, 1);
322}
323
324static int
325chat_IsSet(struct fdescriptor *d, const fd_set *fdset)
326{
327  struct chat *c = descriptor2chat(d);
328  return c->argptr && physical_IsSet(&c->physical->desc, fdset);
329}
330
331static void
332chat_UpdateLog(struct chat *c, int in)
333{
334  if (log_IsKept(LogCHAT) || log_IsKept(LogCONNECT)) {
335    /*
336     * If a linefeed appears in the last `in' characters of `c's input
337     * buffer, output from there, all the way back to the last linefeed.
338     * This is called for every read of `in' bytes.
339     */
340    char *ptr, *end, *stop, ch;
341    int level;
342
343    level = log_IsKept(LogCHAT) ? LogCHAT : LogCONNECT;
344    if (in == -1)
345      end = ptr = c->bufend;
346    else {
347      ptr = c->bufend - in;
348      for (end = c->bufend - 1; end >= ptr; end--)
349        if (*end == '\n')
350          break;
351    }
352
353    if (end >= ptr) {
354      for (ptr = c->bufend - (in == -1 ? 1 : in + 1); ptr >= c->bufstart; ptr--)
355        if (*ptr == '\n')
356          break;
357      ptr++;
358      stop = NULL;
359      while (stop < end) {
360        if ((stop = memchr(ptr, '\n', end - ptr)) == NULL)
361          stop = end;
362        ch = *stop;
363        *stop = '\0';
364        if (level == LogCHAT || strstr(ptr, "CONNECT"))
365          log_Printf(level, "Received: %s\n", ptr);
366        *stop = ch;
367        ptr = stop + 1;
368      }
369    }
370  }
371}
372
373static void
374chat_Read(struct fdescriptor *d, struct bundle *bundle __unused,
375	  const fd_set *fdset __unused)
376{
377  struct chat *c = descriptor2chat(d);
378
379  if (c->state == CHAT_EXPECT) {
380    ssize_t in;
381    char *abegin, *ebegin, *begin, *aend, *eend, *end;
382    int n;
383
384    /*
385     * XXX - should this read only 1 byte to guarantee that we don't
386     * swallow any ppp talk from the peer ?
387     */
388    in = BUFLEFT(c);
389    if (in > (ssize_t)sizeof c->buf / 2)
390      in = sizeof c->buf / 2;
391
392    in = physical_Read(c->physical, c->bufend, in);
393    if (in <= 0)
394      return;
395
396    /* `begin' and `end' delimit where we're going to strncmp() from */
397    ebegin = c->bufend - c->arglen + 1;
398    eend = ebegin + in;
399    if (ebegin < c->bufstart)
400      ebegin = c->bufstart;
401
402    if (c->abort.num) {
403      abegin = c->bufend - c->abort.string[0].len + 1;
404      aend = c->bufend - c->abort.string[c->abort.num-1].len + in + 1;
405      if (abegin < c->bufstart)
406        abegin = c->bufstart;
407    } else {
408      abegin = ebegin;
409      aend = eend;
410    }
411    begin = abegin < ebegin ? abegin : ebegin;
412    end = aend < eend ? eend : aend;
413
414    c->bufend += in;
415
416    chat_UpdateLog(c, in);
417
418    if (c->bufend > c->buf + sizeof c->buf / 2) {
419      /* Shuffle our receive buffer back a bit */
420      int chop;
421
422      for (chop = begin - c->buf; chop; chop--)
423        if (c->buf[chop] == '\n')
424          /* found some already-logged garbage to remove :-) */
425          break;
426
427      if (!chop)
428        chop = begin - c->buf;
429
430      if (chop) {
431        char *from, *to;
432
433        to = c->buf;
434        from = to + chop;
435        while (from < c->bufend)
436          *to++ = *from++;
437        c->bufstart -= chop;
438        c->bufend -= chop;
439        begin -= chop;
440        end -= chop;
441        abegin -= chop;
442        aend -= chop;
443        ebegin -= chop;
444        eend -= chop;
445      }
446    }
447
448    for (; begin < end; begin++)
449      if (begin >= ebegin && begin < eend &&
450          !strncmp(begin, c->argptr, c->arglen)) {
451        /* Got it ! */
452        timer_Stop(&c->timeout);
453        if (memchr(begin + c->arglen - 1, '\n',
454            c->bufend - begin - c->arglen + 1) == NULL) {
455          /* force it into the log */
456          end = c->bufend;
457          c->bufend = begin + c->arglen;
458          chat_UpdateLog(c, -1);
459          c->bufend = end;
460        }
461        c->bufstart = begin + c->arglen;
462        c->argptr += c->arglen;
463        c->arglen = 0;
464        break;
465      } else if (begin >= abegin && begin < aend) {
466        for (n = c->abort.num - 1; n >= 0; n--) {
467          if (begin + c->abort.string[n].len > c->bufend)
468            break;
469          if (!strncmp(begin, c->abort.string[n].data,
470                       c->abort.string[n].len)) {
471            if (memchr(begin + c->abort.string[n].len - 1, '\n',
472                c->bufend - begin - c->abort.string[n].len + 1) == NULL) {
473              /* force it into the log */
474              end = c->bufend;
475              c->bufend = begin + c->abort.string[n].len;
476              chat_UpdateLog(c, -1);
477              c->bufend = end;
478            }
479            c->bufstart = begin + c->abort.string[n].len;
480            c->state = CHAT_FAILED;
481            return;
482          }
483        }
484      }
485  }
486}
487
488static int
489chat_Write(struct fdescriptor *d, struct bundle *bundle __unused,
490	   const fd_set *fdset __unused)
491{
492  struct chat *c = descriptor2chat(d);
493  int result = 0;
494
495  if (c->state == CHAT_SEND) {
496    int wrote;
497
498    if (strstr(c->argv[c->arg], "\\P"))            /* Don't log the password */
499      log_Printf(LogCHAT, "Send: %s\n", c->argv[c->arg]);
500    else {
501      int sz;
502
503      sz = c->arglen - 1;
504      while (sz >= 0 && c->argptr[sz] == '\n')
505        sz--;
506      log_Printf(LogCHAT, "Send: %.*s\n", sz + 1, c->argptr);
507    }
508
509    if (physical_IsSync(c->physical)) {
510      /*
511       * XXX: Fix me
512       * This data should be stuffed down through the link layers
513       */
514      /* There's always room for the HDLC header */
515      c->argptr -= 2;
516      c->arglen += 2;
517      memcpy(c->argptr, "\377\003", 2);	/* Prepend HDLC header */
518    }
519
520    wrote = physical_Write(c->physical, c->argptr, c->arglen);
521    result = wrote > 0 ? 1 : 0;
522    if (wrote == -1) {
523      if (errno != EINTR) {
524        log_Printf(LogWARN, "chat_Write: %s\n", strerror(errno));
525	result = -1;
526      }
527      if (physical_IsSync(c->physical)) {
528        c->argptr += 2;
529        c->arglen -= 2;
530      }
531    } else if (wrote < 2 && physical_IsSync(c->physical)) {
532      /* Oops - didn't even write our HDLC header ! */
533      c->argptr += 2;
534      c->arglen -= 2;
535    } else {
536      c->argptr += wrote;
537      c->arglen -= wrote;
538    }
539  }
540
541  return result;
542}
543
544void
545chat_Init(struct chat *c, struct physical *p)
546{
547  c->desc.type = CHAT_DESCRIPTOR;
548  c->desc.UpdateSet = chat_UpdateSet;
549  c->desc.IsSet = chat_IsSet;
550  c->desc.Read = chat_Read;
551  c->desc.Write = chat_Write;
552  c->physical = p;
553  *c->script = '\0';
554  c->argc = 0;
555  c->arg = -1;
556  c->argptr = NULL;
557  c->nargptr = NULL;
558  c->bufstart = c->bufend = c->buf;
559
560  memset(&c->pause, '\0', sizeof c->pause);
561  memset(&c->timeout, '\0', sizeof c->timeout);
562}
563
564int
565chat_Setup(struct chat *c, const char *data, const char *phone)
566{
567  c->state = CHAT_EXPECT;
568
569  if (data == NULL) {
570    *c->script = '\0';
571    c->argc = 0;
572  } else {
573    strncpy(c->script, data, sizeof c->script - 1);
574    c->script[sizeof c->script - 1] = '\0';
575    c->argc = MakeArgs(c->script, c->argv, VECSIZE(c->argv), PARSE_NOHASH);
576  }
577
578  c->arg = -1;
579  c->argptr = NULL;
580  c->nargptr = NULL;
581
582  c->TimeoutSec = 30;
583  c->TimedOut = 0;
584  c->phone = phone;
585  c->abort.num = 0;
586
587  timer_Stop(&c->pause);
588  timer_Stop(&c->timeout);
589
590  return c->argc >= 0;
591}
592
593void
594chat_Finish(struct chat *c)
595{
596  timer_Stop(&c->pause);
597  timer_Stop(&c->timeout);
598  while (c->abort.num)
599    free(c->abort.string[--c->abort.num].data);
600  c->abort.num = 0;
601}
602
603void
604chat_Destroy(struct chat *c)
605{
606  chat_Finish(c);
607}
608
609/*
610 *  \c	don't add a cr
611 *  \d  Sleep a little (delay 2 seconds
612 *  \n  Line feed character
613 *  \P  Auth Key password
614 *  \p  pause 0.25 sec
615 *  \r	Carrige return character
616 *  \s  Space character
617 *  \T  Telephone number(s) (defined via `set phone')
618 *  \t  Tab character
619 *  \U  Auth User
620 */
621static char *
622ExpandString(struct chat *c, const char *str, char *result, int reslen, int cr)
623{
624  int len;
625
626  result[--reslen] = '\0';
627  while (*str && reslen > 0) {
628    switch (*str) {
629    case '\\':
630      str++;
631      switch (*str) {
632      case 'c':
633	cr = 0;
634	break;
635      case 'd':		/* Delay 2 seconds */
636        chat_Pause(c, 2 * SECTICKS);
637	break;
638      case 'p':
639        chat_Pause(c, SECTICKS / 4);
640	break;		/* Delay 0.25 seconds */
641      case 'n':
642	*result++ = '\n';
643	reslen--;
644	break;
645      case 'r':
646	*result++ = '\r';
647	reslen--;
648	break;
649      case 's':
650	*result++ = ' ';
651	reslen--;
652	break;
653      case 't':
654	*result++ = '\t';
655	reslen--;
656	break;
657      case 'P':
658	strncpy(result, c->physical->dl->bundle->cfg.auth.key, reslen);
659        len = strlen(result);
660	reslen -= len;
661	result += len;
662	break;
663      case 'T':
664        if (c->phone) {
665          strncpy(result, c->phone, reslen);
666          len = strlen(result);
667          reslen -= len;
668          result += len;
669        }
670	break;
671      case 'U':
672	strncpy(result, c->physical->dl->bundle->cfg.auth.name, reslen);
673        len = strlen(result);
674	reslen -= len;
675	result += len;
676	break;
677      default:
678	reslen--;
679	*result++ = *str;
680	break;
681      }
682      if (*str)
683	str++;
684      break;
685    case '^':
686      str++;
687      if (*str) {
688	*result++ = *str++ & 0x1f;
689	reslen--;
690      }
691      break;
692    default:
693      *result++ = *str++;
694      reslen--;
695      break;
696    }
697  }
698  if (--reslen > 0) {
699    if (cr)
700      *result++ = '\r';
701  }
702  if (--reslen > 0)
703    *result++ = '\0';
704  return (result);
705}
706
707static void
708ExecStr(struct physical *physical, char *command, char *out, int olen)
709{
710  pid_t pid;
711  int fids[2];
712  char *argv[MAXARGS], *vector[MAXARGS], *startout, *endout;
713  int stat, nb, argc, i;
714
715  log_Printf(LogCHAT, "Exec: %s\n", command);
716  if ((argc = MakeArgs(command, vector, VECSIZE(vector),
717                       PARSE_REDUCE|PARSE_NOHASH)) <= 0) {
718    if (argc < 0)
719      log_Printf(LogWARN, "Syntax error in exec command\n");
720    *out = '\0';
721    return;
722  }
723
724  if (pipe(fids) < 0) {
725    log_Printf(LogCHAT, "Unable to create pipe in ExecStr: %s\n",
726	      strerror(errno));
727    *out = '\0';
728    return;
729  }
730  if ((pid = fork()) == 0) {
731    command_Expand(argv, argc, (char const *const *)vector,
732                   physical->dl->bundle, 0, getpid());
733    close(fids[0]);
734    timer_TermService();
735    if (fids[1] == STDIN_FILENO)
736      fids[1] = dup(fids[1]);
737    dup2(physical->fd, STDIN_FILENO);
738    dup2(fids[1], STDERR_FILENO);
739    dup2(STDIN_FILENO, STDOUT_FILENO);
740    close(3);
741    if (open(_PATH_TTY, O_RDWR) != 3)
742      open(_PATH_DEVNULL, O_RDWR);	/* Leave it closed if it fails... */
743    for (i = getdtablesize(); i > 3; i--)
744      fcntl(i, F_SETFD, 1);
745#ifndef NOSUID
746    setuid(ID0realuid());
747#endif
748    execvp(argv[0], argv);
749    fprintf(stderr, "execvp: %s: %s\n", argv[0], strerror(errno));
750    _exit(127);
751  } else {
752    char *name = strdup(vector[0]);
753
754    close(fids[1]);
755    endout = out + olen - 1;
756    startout = out;
757    while (out < endout) {
758      nb = read(fids[0], out, 1);
759      if (nb <= 0)
760	break;
761      out++;
762    }
763    *out = '\0';
764    close(fids[0]);
765    close(fids[1]);
766    waitpid(pid, &stat, WNOHANG);
767    if (WIFSIGNALED(stat)) {
768      log_Printf(LogWARN, "%s: signal %d\n", name, WTERMSIG(stat));
769      free(name);
770      *out = '\0';
771      return;
772    } else if (WIFEXITED(stat)) {
773      switch (WEXITSTATUS(stat)) {
774        case 0:
775          free(name);
776          break;
777        case 127:
778          log_Printf(LogWARN, "%s: %s\n", name, startout);
779          free(name);
780          *out = '\0';
781          return;
782          break;
783        default:
784          log_Printf(LogWARN, "%s: exit %d\n", name, WEXITSTATUS(stat));
785          free(name);
786          *out = '\0';
787          return;
788          break;
789      }
790    } else {
791      log_Printf(LogWARN, "%s: Unexpected exit result\n", name);
792      free(name);
793      *out = '\0';
794      return;
795    }
796  }
797}
798