chat.c revision 37192 
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 *	$Id: chat.c,v 1.49 1998/06/24 19:33:31 brian Exp $
27 */
28
29#include <sys/types.h>
30#include <netinet/in.h>
31#include <netinet/in_systm.h>
32#include <netinet/ip.h>
33#include <sys/un.h>
34
35#include <errno.h>
36#include <fcntl.h>
37#include <paths.h>
38#include <stdio.h>
39#include <stdlib.h>
40#include <string.h>
41#include <sys/wait.h>
42#include <termios.h>
43#include <unistd.h>
44
45#include "mbuf.h"
46#include "log.h"
47#include "defs.h"
48#include "timer.h"
49#include "lqr.h"
50#include "hdlc.h"
51#include "throughput.h"
52#include "fsm.h"
53#include "lcp.h"
54#include "ccp.h"
55#include "link.h"
56#include "async.h"
57#include "descriptor.h"
58#include "physical.h"
59#include "chat.h"
60#include "mp.h"
61#include "auth.h"
62#include "chap.h"
63#include "slcompress.h"
64#include "iplist.h"
65#include "ipcp.h"
66#include "filter.h"
67#include "datalink.h"
68#include "bundle.h"
69
70#define BUFLEFT(c) (sizeof (c)->buf - ((c)->bufend - (c)->buf))
71#define	issep(c)	((c) == '\t' || (c) == ' ')
72
73static void ExecStr(struct physical *, char *, char *, int);
74static char *ExpandString(struct chat *, const char *, char *, int, int);
75
76static void
77chat_PauseTimer(void *v)
78{
79  struct chat *c = (struct chat *)v;
80  timer_Stop(&c->pause);
81  c->pause.load = 0;
82}
83
84static void
85chat_Pause(struct chat *c, u_long load)
86{
87  timer_Stop(&c->pause);
88  c->pause.load += load;
89  c->pause.func = chat_PauseTimer;
90  c->pause.name = "chat pause";
91  c->pause.arg = c;
92  timer_Start(&c->pause);
93}
94
95static void
96chat_TimeoutTimer(void *v)
97{
98  struct chat *c = (struct chat *)v;
99  timer_Stop(&c->timeout);
100  c->TimedOut = 1;
101}
102
103static void
104chat_SetTimeout(struct chat *c)
105{
106  timer_Stop(&c->timeout);
107  if (c->TimeoutSec > 0) {
108    c->timeout.load = SECTICKS * c->TimeoutSec;
109    c->timeout.func = chat_TimeoutTimer;
110    c->timeout.name = "chat timeout";
111    c->timeout.arg = c;
112    timer_Start(&c->timeout);
113  }
114}
115
116static char *
117chat_NextChar(char *ptr, char ch)
118{
119  for (; *ptr; ptr++)
120    if (*ptr == ch)
121      return ptr;
122    else if (*ptr == '\\')
123      if (*++ptr == '\0')
124        return NULL;
125
126  return NULL;
127}
128
129static int
130chat_UpdateSet(struct descriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
131{
132  struct chat *c = descriptor2chat(d);
133  int special, gotabort, gottimeout, needcr;
134  int TimedOut = c->TimedOut;
135  static char arg_term;		/* An empty string */
136
137  if (c->pause.state == TIMER_RUNNING)
138    return 0;
139
140  if (TimedOut) {
141    log_Printf(LogCHAT, "Expect timeout\n");
142    if (c->nargptr == NULL)
143      c->state = CHAT_FAILED;
144    else {
145      /* c->state = CHAT_EXPECT; */
146      c->argptr = &arg_term;
147    }
148    c->TimedOut = 0;
149  }
150
151  if (c->state != CHAT_EXPECT && c->state != CHAT_SEND)
152    return 0;
153
154  gottimeout = gotabort = 0;
155
156  if (c->arg < c->argc && (c->arg < 0 || *c->argptr == '\0')) {
157    /* Go get the next string */
158    if (c->arg < 0 || c->state == CHAT_SEND)
159      c->state = CHAT_EXPECT;
160    else
161      c->state = CHAT_SEND;
162
163    special = 1;
164    while (special && (c->nargptr || c->arg < c->argc - 1)) {
165      if (c->arg < 0 || (!TimedOut && c->state == CHAT_SEND))
166        c->nargptr = NULL;
167
168      if (c->nargptr != NULL) {
169        /* We're doing expect-send-expect.... */
170        c->argptr = c->nargptr;
171        /* Put the '-' back in case we ever want to rerun our script */
172        c->nargptr[-1] = '-';
173        c->nargptr = chat_NextChar(c->nargptr, '-');
174        if (c->nargptr != NULL)
175          *c->nargptr++ = '\0';
176      } else {
177        int minus;
178
179        c->argptr = c->argv[++c->arg];
180
181        if (c->state == CHAT_EXPECT) {
182          /* Look for expect-send-expect sequence */
183          c->nargptr = c->argptr;
184          minus = 0;
185          while ((c->nargptr = chat_NextChar(c->nargptr, '-'))) {
186            c->nargptr++;
187            minus++;
188          }
189
190          if (minus % 2)
191            log_Printf(LogWARN, "chat_UpdateSet: \"%s\": Uneven number of"
192                      " '-' chars, all ignored\n", c->argptr);
193          else if (minus) {
194            c->nargptr = chat_NextChar(c->argptr, '-');
195            *c->nargptr++ = '\0';
196          }
197        }
198      }
199
200      /*
201       * c->argptr now temporarily points into c->script (via c->argv)
202       * If it's an expect-send-expect sequence, we've just got the correct
203       * portion of that sequence.
204       */
205
206      needcr = c->state == CHAT_SEND && *c->argptr != '!';
207
208      /* We leave room for a potential HDLC header in the target string */
209      ExpandString(c, c->argptr, c->exp + 2, sizeof c->exp - 2, needcr);
210
211      if (gotabort) {
212        if (c->abort.num < MAXABORTS) {
213          int len, i;
214
215          len = strlen(c->exp+2);
216          for (i = 0; i < c->abort.num; i++)
217            if (len > c->abort.string[i].len) {
218              int last;
219
220              for (last = c->abort.num; last > i; last--) {
221                c->abort.string[last].data = c->abort.string[last-1].data;
222                c->abort.string[last].len = c->abort.string[last-1].len;
223              }
224              break;
225            }
226          c->abort.string[i].len = len;
227          c->abort.string[i].data = (char *)malloc(len+1);
228          memcpy(c->abort.string[i].data, c->exp+2, len+1);
229          c->abort.num++;
230        } else
231          log_Printf(LogERROR, "chat_UpdateSet: too many abort strings\n");
232        gotabort = 0;
233      } else if (gottimeout) {
234        c->TimeoutSec = atoi(c->exp + 2);
235        if (c->TimeoutSec <= 0)
236          c->TimeoutSec = 30;
237        gottimeout = 0;
238      } else if (c->nargptr == NULL && !strcmp(c->exp+2, "ABORT"))
239        gotabort = 1;
240      else if (c->nargptr == NULL && !strcmp(c->exp+2, "TIMEOUT"))
241        gottimeout = 1;
242      else {
243        if (c->exp[2] == '!')
244          ExecStr(c->physical, c->exp + 3, c->exp + 2, sizeof c->exp - 2);
245
246        if (c->exp[2] == '\0') {
247          /* Empty string, reparse (this may be better as a `goto start') */
248          c->argptr = &arg_term;
249          return chat_UpdateSet(d, r, w, e, n);
250        }
251
252        special = 0;
253      }
254    }
255
256    if (special) {
257      if (gottimeout)
258        log_Printf(LogWARN, "chat_UpdateSet: TIMEOUT: Argument expected\n");
259      else if (gotabort)
260        log_Printf(LogWARN, "chat_UpdateSet: ABORT: Argument expected\n");
261
262      /* End of script - all ok */
263      c->state = CHAT_DONE;
264      return 0;
265    }
266
267    /* set c->argptr to point in the right place */
268    c->argptr = c->exp + 2;
269    c->arglen = strlen(c->argptr);
270
271    if (c->state == CHAT_EXPECT) {
272      /* We must check to see if the string's already been found ! */
273      char *begin, *end;
274
275      end = c->bufend - c->arglen + 1;
276      if (end < c->bufstart)
277        end = c->bufstart;
278      for (begin = c->bufstart; begin < end; begin++)
279        if (!strncmp(begin, c->argptr, c->arglen)) {
280          c->bufstart = begin + c->arglen;
281          c->argptr += c->arglen;
282          c->arglen = 0;
283          /* Continue - we've already read our expect string */
284          return chat_UpdateSet(d, r, w, e, n);
285        }
286
287      log_Printf(LogCHAT, "Expect(%d): %s\n", c->TimeoutSec, c->argptr);
288      chat_SetTimeout(c);
289    }
290  }
291
292  /*
293   * We now have c->argptr pointing at what we want to expect/send and
294   * c->state saying what we want to do... we now know what to put in
295   * the fd_set :-)
296   */
297
298  if (c->state == CHAT_EXPECT)
299    return physical_UpdateSet(&c->physical->desc, r, NULL, e, n, 1);
300  else
301    return physical_UpdateSet(&c->physical->desc, NULL, w, e, n, 1);
302}
303
304static int
305chat_IsSet(struct descriptor *d, const fd_set *fdset)
306{
307  struct chat *c = descriptor2chat(d);
308  return physical_IsSet(&c->physical->desc, fdset);
309}
310
311static void
312chat_UpdateLog(struct chat *c, int in)
313{
314  if (log_IsKept(LogCHAT) || log_IsKept(LogCONNECT)) {
315    /*
316     * If a linefeed appears in the last `in' characters of `c's input
317     * buffer, output from there, all the way back to the last linefeed.
318     * This is called for every read of `in' bytes.
319     */
320    char *ptr, *end, *stop, ch;
321    int level;
322
323    level = log_IsKept(LogCHAT) ? LogCHAT : LogCONNECT;
324    if (in == -1)
325      end = ptr = c->bufend;
326    else {
327      ptr = c->bufend - in;
328      for (end = c->bufend - 1; end >= ptr; end--)
329        if (*end == '\n')
330          break;
331    }
332
333    if (end >= ptr) {
334      for (ptr = c->bufend - (in == -1 ? 1 : in + 1); ptr >= c->bufstart; ptr--)
335        if (*ptr == '\n')
336          break;
337      ptr++;
338      stop = NULL;
339      while (stop < end) {
340        if ((stop = memchr(ptr, '\n', end - ptr)) == NULL)
341          stop = end;
342        ch = *stop;
343        *stop = '\0';
344        if (level == LogCHAT || strstr(ptr, "CONNECT"))
345          log_Printf(level, "Received: %s\n", ptr);
346        *stop = ch;
347        ptr = stop + 1;
348      }
349    }
350  }
351}
352
353static void
354chat_Read(struct descriptor *d, struct bundle *bundle, const fd_set *fdset)
355{
356  struct chat *c = descriptor2chat(d);
357
358  if (c->state == CHAT_EXPECT) {
359    ssize_t in;
360    char *abegin, *ebegin, *begin, *aend, *eend, *end;
361    int n;
362
363    /*
364     * XXX - should this read only 1 byte to guarantee that we don't
365     * swallow any ppp talk from the peer ?
366     */
367    in = BUFLEFT(c);
368    if (in > sizeof c->buf / 2)
369      in = sizeof c->buf / 2;
370
371    in = physical_Read(c->physical, c->bufend, in);
372    if (in <= 0)
373      return;
374
375    /* `begin' and `end' delimit where we're going to strncmp() from */
376    ebegin = c->bufend - c->arglen + 1;
377    eend = ebegin + in;
378    if (ebegin < c->bufstart)
379      ebegin = c->bufstart;
380
381    if (c->abort.num) {
382      abegin = c->bufend - c->abort.string[0].len + 1;
383      aend = c->bufend - c->abort.string[c->abort.num-1].len + in + 1;
384      if (abegin < c->bufstart)
385        abegin = c->bufstart;
386    } else {
387      abegin = ebegin;
388      aend = eend;
389    }
390    begin = abegin < ebegin ? abegin : ebegin;
391    end = aend < eend ? eend : aend;
392
393    c->bufend += in;
394
395    chat_UpdateLog(c, in);
396
397    if (c->bufend > c->buf + sizeof c->buf / 2) {
398      /* Shuffle our receive buffer back a bit */
399      int chop;
400
401      for (chop = begin - c->buf; chop; chop--)
402        if (c->buf[chop] == '\n')
403          /* found some already-logged garbage to remove :-) */
404          break;
405
406      if (!chop)
407        chop = begin - c->buf;
408
409      if (chop) {
410        char *from, *to;
411
412        to = c->buf;
413        from = to + chop;
414        while (from < c->bufend)
415          *to++ = *from++;
416        c->bufstart -= chop;
417        c->bufend -= chop;
418        begin -= chop;
419        end -= chop;
420        abegin -= chop;
421        aend -= chop;
422        ebegin -= chop;
423        eend -= chop;
424      }
425    }
426
427    for (; begin < end; begin++)
428      if (begin >= ebegin && begin < eend &&
429          !strncmp(begin, c->argptr, c->arglen)) {
430        /* Got it ! */
431        if (memchr(begin + c->arglen - 1, '\n',
432            c->bufend - begin - c->arglen + 1) == NULL) {
433          /* force it into the log */
434          end = c->bufend;
435          c->bufend = begin + c->arglen;
436          chat_UpdateLog(c, -1);
437          c->bufend = end;
438        }
439        c->bufstart = begin + c->arglen;
440        c->argptr += c->arglen;
441        c->arglen = 0;
442        break;
443      } else if (begin >= abegin && begin < aend) {
444        for (n = c->abort.num - 1; n >= 0; n--) {
445          if (begin + c->abort.string[n].len > c->bufend)
446            break;
447          if (!strncmp(begin, c->abort.string[n].data,
448                       c->abort.string[n].len)) {
449            if (memchr(begin + c->abort.string[n].len - 1, '\n',
450                c->bufend - begin - c->abort.string[n].len + 1) == NULL) {
451              /* force it into the log */
452              end = c->bufend;
453              c->bufend = begin + c->abort.string[n].len;
454              chat_UpdateLog(c, -1);
455              c->bufend = end;
456            }
457            c->bufstart = begin + c->abort.string[n].len;
458            c->state = CHAT_FAILED;
459            return;
460          }
461        }
462      }
463  }
464}
465
466static int
467chat_Write(struct descriptor *d, struct bundle *bundle, const fd_set *fdset)
468{
469  struct chat *c = descriptor2chat(d);
470  int result = 0;
471
472  if (c->state == CHAT_SEND) {
473    int wrote;
474
475    if (strstr(c->argv[c->arg], "\\P"))            /* Don't log the password */
476      log_Printf(LogCHAT, "Send: %s\n", c->argv[c->arg]);
477    else {
478      int sz;
479
480      sz = c->arglen - 1;
481      while (sz >= 0 && c->argptr[sz] == '\n')
482        sz--;
483      log_Printf(LogCHAT, "Send: %.*s\n", sz + 1, c->argptr);
484    }
485
486    if (physical_IsSync(c->physical)) {
487      /* There's always room for the HDLC header */
488      c->argptr -= 2;
489      c->arglen += 2;
490      memcpy(c->argptr, "\377\003", 2);	/* Prepend HDLC header */
491    }
492
493    wrote = physical_Write(c->physical, c->argptr, c->arglen);
494    result = wrote ? 1 : 0;
495    if (wrote == -1) {
496      if (errno != EINTR)
497        log_Printf(LogERROR, "chat_Write: %s\n", strerror(errno));
498      if (physical_IsSync(c->physical)) {
499        c->argptr += 2;
500        c->arglen -= 2;
501      }
502    } else if (wrote < 2 && physical_IsSync(c->physical)) {
503      /* Oops - didn't even write our HDLC header ! */
504      c->argptr += 2;
505      c->arglen -= 2;
506    } else {
507      c->argptr += wrote;
508      c->arglen -= wrote;
509    }
510  }
511
512  return result;
513}
514
515void
516chat_Init(struct chat *c, struct physical *p, const char *data, int emptybuf,
517          const char *phone)
518{
519  c->desc.type = CHAT_DESCRIPTOR;
520  c->desc.UpdateSet = chat_UpdateSet;
521  c->desc.IsSet = chat_IsSet;
522  c->desc.Read = chat_Read;
523  c->desc.Write = chat_Write;
524  c->physical = p;
525
526  c->state = CHAT_EXPECT;
527
528  if (data == NULL) {
529    *c->script = '\0';
530    c->argc = 0;
531  } else {
532    strncpy(c->script, data, sizeof c->script - 1);
533    c->script[sizeof c->script - 1] = '\0';
534    c->argc =  MakeArgs(c->script, c->argv, VECSIZE(c->argv));
535  }
536
537  c->arg = -1;
538  c->argptr = NULL;
539  c->nargptr = NULL;
540
541  if (emptybuf)
542    c->bufstart = c->bufend = c->buf;
543
544  c->TimeoutSec = 30;
545  c->TimedOut = 0;
546  c->phone = phone;
547  c->abort.num = 0;
548
549  memset(&c->pause, '\0', sizeof c->pause);
550  memset(&c->timeout, '\0', sizeof c->timeout);
551}
552
553void
554chat_Destroy(struct chat *c)
555{
556  timer_Stop(&c->pause);
557  timer_Stop(&c->timeout);
558  while (c->abort.num)
559    free(c->abort.string[--c->abort.num].data);
560  c->abort.num = 0;
561}
562
563static char *
564findblank(char *p, int instring)
565{
566  if (instring) {
567    while (*p) {
568      if (*p == '\\') {
569	strcpy(p, p + 1);
570	if (!*p)
571	  break;
572      } else if (*p == '"')
573	return (p);
574      p++;
575    }
576  } else {
577    while (*p) {
578      if (issep(*p))
579	return (p);
580      p++;
581    }
582  }
583  return p;
584}
585
586int
587MakeArgs(char *script, char **pvect, int maxargs)
588{
589  int nargs, nb;
590  int instring;
591
592  nargs = 0;
593  while (*script) {
594    nb = strspn(script, " \t");
595    script += nb;
596    if (*script) {
597      if (*script == '"') {
598	instring = 1;
599	script++;
600	if (*script == '\0')
601	  break;		/* Shouldn't return here. Need to null
602				 * terminate below */
603      } else
604	instring = 0;
605      if (nargs >= maxargs - 1)
606	break;
607      *pvect++ = script;
608      nargs++;
609      script = findblank(script, instring);
610      if (*script)
611	*script++ = '\0';
612    }
613  }
614  *pvect = NULL;
615  return nargs;
616}
617
618/*
619 *  \c	don't add a cr
620 *  \d  Sleep a little (delay 2 seconds
621 *  \n  Line feed character
622 *  \P  Auth Key password
623 *  \p  pause 0.25 sec
624 *  \r	Carrige return character
625 *  \s  Space character
626 *  \T  Telephone number(s) (defined via `set phone')
627 *  \t  Tab character
628 *  \U  Auth User
629 */
630static char *
631ExpandString(struct chat *c, const char *str, char *result, int reslen,
632                  int sendmode)
633{
634  int addcr = 0;
635
636  result[--reslen] = '\0';
637  if (sendmode)
638    addcr = 1;
639  while (*str && reslen > 0) {
640    switch (*str) {
641    case '\\':
642      str++;
643      switch (*str) {
644      case 'c':
645	if (sendmode)
646	  addcr = 0;
647	break;
648      case 'd':		/* Delay 2 seconds */
649        chat_Pause(c, 2 * SECTICKS);
650	break;
651      case 'p':
652        chat_Pause(c, SECTICKS / 4);
653	break;			/* Pause 0.25 sec */
654      case 'n':
655	*result++ = '\n';
656	reslen--;
657	break;
658      case 'r':
659	*result++ = '\r';
660	reslen--;
661	break;
662      case 's':
663	*result++ = ' ';
664	reslen--;
665	break;
666      case 't':
667	*result++ = '\t';
668	reslen--;
669	break;
670      case 'P':
671	strncpy(result, c->physical->dl->bundle->cfg.auth.key, reslen);
672	reslen -= strlen(result);
673	result += strlen(result);
674	break;
675      case 'T':
676        strncpy(result, c->phone, reslen);
677        reslen -= strlen(result);
678        result += strlen(result);
679	break;
680      case 'U':
681	strncpy(result, c->physical->dl->bundle->cfg.auth.name, reslen);
682	reslen -= strlen(result);
683	result += strlen(result);
684	break;
685      default:
686	reslen--;
687	*result++ = *str;
688	break;
689      }
690      if (*str)
691	str++;
692      break;
693    case '^':
694      str++;
695      if (*str) {
696	*result++ = *str++ & 0x1f;
697	reslen--;
698      }
699      break;
700    default:
701      *result++ = *str++;
702      reslen--;
703      break;
704    }
705  }
706  if (--reslen > 0) {
707    if (addcr)
708      *result++ = '\r';
709  }
710  if (--reslen > 0)
711    *result++ = '\0';
712  return (result);
713}
714
715static void
716ExecStr(struct physical *physical, char *command, char *out, int olen)
717{
718  pid_t pid;
719  int fids[2];
720  char *vector[MAXARGS], *startout, *endout;
721  int stat, nb;
722
723  log_Printf(LogCHAT, "Exec: %s\n", command);
724  MakeArgs(command, vector, VECSIZE(vector));
725
726  if (pipe(fids) < 0) {
727    log_Printf(LogCHAT, "Unable to create pipe in ExecStr: %s\n",
728	      strerror(errno));
729    *out = '\0';
730    return;
731  }
732  if ((pid = fork()) == 0) {
733    close(fids[0]);
734    timer_TermService();
735    fids[1] = fcntl(fids[1], F_DUPFD, 4);
736    dup2(physical_GetFD(physical), STDIN_FILENO);
737    dup2(STDIN_FILENO, STDOUT_FILENO);
738    dup2(fids[1], STDERR_FILENO);
739    close(3);
740    if (open(_PATH_TTY, O_RDWR) == 3)
741      fcntl(3, F_SETFD, 0);	/* Clear close-on-exec flag */
742    else
743      fcntl(3, F_SETFD, 1);	/* Set close-on-exec flag */
744    setuid(geteuid());
745    execvp(vector[0], vector);
746    fprintf(stderr, "execvp failed: %s: %s\n", vector[0], strerror(errno));
747    exit(127);
748  } else {
749    char *name = strdup(vector[0]);
750
751    close(fids[1]);
752    endout = out + olen - 1;
753    startout = out;
754    while (out < endout) {
755      nb = read(fids[0], out, 1);
756      if (nb <= 0)
757	break;
758      out++;
759    }
760    *out = '\0';
761    close(fids[0]);
762    close(fids[1]);
763    waitpid(pid, &stat, WNOHANG);
764    if (WIFSIGNALED(stat)) {
765      log_Printf(LogWARN, "%s: signal %d\n", name, WTERMSIG(stat));
766      free(name);
767      *out = '\0';
768      return;
769    } else if (WIFEXITED(stat)) {
770      switch (WEXITSTATUS(stat)) {
771        case 0:
772          free(name);
773          break;
774        case 127:
775          log_Printf(LogWARN, "%s: %s\n", name, startout);
776          free(name);
777          *out = '\0';
778          return;
779          break;
780        default:
781          log_Printf(LogWARN, "%s: exit %d\n", name, WEXITSTATUS(stat));
782          free(name);
783          *out = '\0';
784          return;
785          break;
786      }
787    } else {
788      log_Printf(LogWARN, "%s: Unexpected exit result\n", name);
789      free(name);
790      *out = '\0';
791      return;
792    }
793  }
794}
795