xref: /freebsd/usr.sbin/ppp/chat.c (revision 6e8394b8baa7d5d9153ab90de6824bcd19b3b4e1) 
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 1.56 1999/05/27 09:50:10 brian 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/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 "layer.h"
46 #include "mbuf.h"
47 #include "log.h"
48 #include "defs.h"
49 #include "timer.h"
50 #include "lqr.h"
51 #include "hdlc.h"
52 #include "throughput.h"
53 #include "fsm.h"
54 #include "lcp.h"
55 #include "ccp.h"
56 #include "link.h"
57 #include "async.h"
58 #include "descriptor.h"
59 #include "physical.h"
60 #include "chat.h"
61 #include "mp.h"
62 #include "auth.h"
63 #include "chap.h"
64 #include "slcompress.h"
65 #include "iplist.h"
66 #include "ipcp.h"
67 #include "filter.h"
68 #include "cbcp.h"
69 #include "command.h"
70 #include "datalink.h"
71 #ifndef NORADIUS
72 #include "radius.h"
73 #endif
74 #include "bundle.h"
75 
76 #define BUFLEFT(c) (sizeof (c)->buf - ((c)->bufend - (c)->buf))
77 
78 static void ExecStr(struct physical *, char *, char *, int);
79 static char *ExpandString(struct chat *, const char *, char *, int, int);
80 
81 static void
82 chat_PauseTimer(void *v)
83 {
84   struct chat *c = (struct chat *)v;
85   timer_Stop(&c->pause);
86   c->pause.load = 0;
87 }
88 
89 static void
90 chat_Pause(struct chat *c, u_long load)
91 {
92   timer_Stop(&c->pause);
93   c->pause.load += load;
94   c->pause.func = chat_PauseTimer;
95   c->pause.name = "chat pause";
96   c->pause.arg = c;
97   timer_Start(&c->pause);
98 }
99 
100 static void
101 chat_TimeoutTimer(void *v)
102 {
103   struct chat *c = (struct chat *)v;
104   timer_Stop(&c->timeout);
105   c->TimedOut = 1;
106 }
107 
108 static void
109 chat_SetTimeout(struct chat *c)
110 {
111   timer_Stop(&c->timeout);
112   if (c->TimeoutSec > 0) {
113     c->timeout.load = SECTICKS * c->TimeoutSec;
114     c->timeout.func = chat_TimeoutTimer;
115     c->timeout.name = "chat timeout";
116     c->timeout.arg = c;
117     timer_Start(&c->timeout);
118   }
119 }
120 
121 static char *
122 chat_NextChar(char *ptr, char ch)
123 {
124   for (; *ptr; ptr++)
125     if (*ptr == ch)
126       return ptr;
127     else if (*ptr == '\\')
128       if (*++ptr == '\0')
129         return NULL;
130 
131   return NULL;
132 }
133 
134 static int
135 chat_UpdateSet(struct descriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
136 {
137   struct chat *c = descriptor2chat(d);
138   int special, gotabort, gottimeout, needcr;
139   int TimedOut = c->TimedOut;
140   static char arg_term;		/* An empty string */
141 
142   if (c->pause.state == TIMER_RUNNING)
143     return 0;
144 
145   if (TimedOut) {
146     log_Printf(LogCHAT, "Expect timeout\n");
147     if (c->nargptr == NULL)
148       c->state = CHAT_FAILED;
149     else {
150       /* c->state = CHAT_EXPECT; */
151       c->argptr = &arg_term;
152     }
153     c->TimedOut = 0;
154   }
155 
156   if (c->state != CHAT_EXPECT && c->state != CHAT_SEND)
157     return 0;
158 
159   gottimeout = gotabort = 0;
160 
161   if (c->arg < c->argc && (c->arg < 0 || *c->argptr == '\0')) {
162     /* Go get the next string */
163     if (c->arg < 0 || c->state == CHAT_SEND)
164       c->state = CHAT_EXPECT;
165     else
166       c->state = CHAT_SEND;
167 
168     special = 1;
169     while (special && (c->nargptr || c->arg < c->argc - 1)) {
170       if (c->arg < 0 || (!TimedOut && c->state == CHAT_SEND))
171         c->nargptr = NULL;
172 
173       if (c->nargptr != NULL) {
174         /* We're doing expect-send-expect.... */
175         c->argptr = c->nargptr;
176         /* Put the '-' back in case we ever want to rerun our script */
177         c->nargptr[-1] = '-';
178         c->nargptr = chat_NextChar(c->nargptr, '-');
179         if (c->nargptr != NULL)
180           *c->nargptr++ = '\0';
181       } else {
182         int minus;
183 
184         c->argptr = c->argv[++c->arg];
185 
186         if (c->state == CHAT_EXPECT) {
187           /* Look for expect-send-expect sequence */
188           c->nargptr = c->argptr;
189           minus = 0;
190           while ((c->nargptr = chat_NextChar(c->nargptr, '-'))) {
191             c->nargptr++;
192             minus++;
193           }
194 
195           if (minus % 2)
196             log_Printf(LogWARN, "chat_UpdateSet: \"%s\": Uneven number of"
197                       " '-' chars, all ignored\n", c->argptr);
198           else if (minus) {
199             c->nargptr = chat_NextChar(c->argptr, '-');
200             *c->nargptr++ = '\0';
201           }
202         }
203       }
204 
205       /*
206        * c->argptr now temporarily points into c->script (via c->argv)
207        * If it's an expect-send-expect sequence, we've just got the correct
208        * portion of that sequence.
209        */
210 
211       needcr = c->state == CHAT_SEND && *c->argptr != '!';
212 
213       /* We leave room for a potential HDLC header in the target string */
214       ExpandString(c, c->argptr, c->exp + 2, sizeof c->exp - 2, needcr);
215 
216       /*
217        * Now read our string.  If it's not a special string, we unset
218        * ``special'' to break out of the loop.
219        */
220       if (gotabort) {
221         if (c->abort.num < MAXABORTS) {
222           int len, i;
223 
224           len = strlen(c->exp+2);
225           for (i = 0; i < c->abort.num; i++)
226             if (len > c->abort.string[i].len) {
227               int last;
228 
229               for (last = c->abort.num; last > i; last--) {
230                 c->abort.string[last].data = c->abort.string[last-1].data;
231                 c->abort.string[last].len = c->abort.string[last-1].len;
232               }
233               break;
234             }
235           c->abort.string[i].len = len;
236           c->abort.string[i].data = (char *)malloc(len+1);
237           memcpy(c->abort.string[i].data, c->exp+2, len+1);
238           c->abort.num++;
239         } else
240           log_Printf(LogERROR, "chat_UpdateSet: too many abort strings\n");
241         gotabort = 0;
242       } else if (gottimeout) {
243         c->TimeoutSec = atoi(c->exp + 2);
244         if (c->TimeoutSec <= 0)
245           c->TimeoutSec = 30;
246         gottimeout = 0;
247       } else if (c->nargptr == NULL && !strcmp(c->exp+2, "ABORT"))
248         gotabort = 1;
249       else if (c->nargptr == NULL && !strcmp(c->exp+2, "TIMEOUT"))
250         gottimeout = 1;
251       else {
252         if (c->exp[2] == '!')
253           ExecStr(c->physical, c->exp + 3, c->exp + 2, sizeof c->exp - 2);
254 
255         if (c->exp[2] == '\0') {
256           /* Empty string, reparse (this may be better as a `goto start') */
257           c->argptr = &arg_term;
258           return chat_UpdateSet(d, r, w, e, n);
259         }
260 
261         special = 0;
262       }
263     }
264 
265     if (special) {
266       if (gottimeout)
267         log_Printf(LogWARN, "chat_UpdateSet: TIMEOUT: Argument expected\n");
268       else if (gotabort)
269         log_Printf(LogWARN, "chat_UpdateSet: ABORT: Argument expected\n");
270 
271       /* End of script - all ok */
272       c->state = CHAT_DONE;
273       return 0;
274     }
275 
276     /* set c->argptr to point in the right place */
277     c->argptr = c->exp + 2;
278     c->arglen = strlen(c->argptr);
279 
280     if (c->state == CHAT_EXPECT) {
281       /* We must check to see if the string's already been found ! */
282       char *begin, *end;
283 
284       end = c->bufend - c->arglen + 1;
285       if (end < c->bufstart)
286         end = c->bufstart;
287       for (begin = c->bufstart; begin < end; begin++)
288         if (!strncmp(begin, c->argptr, c->arglen)) {
289           c->bufstart = begin + c->arglen;
290           c->argptr += c->arglen;
291           c->arglen = 0;
292           /* Continue - we've already read our expect string */
293           return chat_UpdateSet(d, r, w, e, n);
294         }
295 
296       log_Printf(LogCHAT, "Expect(%d): %s\n", c->TimeoutSec, c->argptr);
297       chat_SetTimeout(c);
298     }
299   }
300 
301   /*
302    * We now have c->argptr pointing at what we want to expect/send and
303    * c->state saying what we want to do... we now know what to put in
304    * the fd_set :-)
305    */
306 
307   if (c->state == CHAT_EXPECT)
308     return physical_doUpdateSet(&c->physical->desc, r, NULL, e, n, 1);
309   else
310     return physical_doUpdateSet(&c->physical->desc, NULL, w, e, n, 1);
311 }
312 
313 static int
314 chat_IsSet(struct descriptor *d, const fd_set *fdset)
315 {
316   struct chat *c = descriptor2chat(d);
317   return physical_IsSet(&c->physical->desc, fdset);
318 }
319 
320 static void
321 chat_UpdateLog(struct chat *c, int in)
322 {
323   if (log_IsKept(LogCHAT) || log_IsKept(LogCONNECT)) {
324     /*
325      * If a linefeed appears in the last `in' characters of `c's input
326      * buffer, output from there, all the way back to the last linefeed.
327      * This is called for every read of `in' bytes.
328      */
329     char *ptr, *end, *stop, ch;
330     int level;
331 
332     level = log_IsKept(LogCHAT) ? LogCHAT : LogCONNECT;
333     if (in == -1)
334       end = ptr = c->bufend;
335     else {
336       ptr = c->bufend - in;
337       for (end = c->bufend - 1; end >= ptr; end--)
338         if (*end == '\n')
339           break;
340     }
341 
342     if (end >= ptr) {
343       for (ptr = c->bufend - (in == -1 ? 1 : in + 1); ptr >= c->bufstart; ptr--)
344         if (*ptr == '\n')
345           break;
346       ptr++;
347       stop = NULL;
348       while (stop < end) {
349         if ((stop = memchr(ptr, '\n', end - ptr)) == NULL)
350           stop = end;
351         ch = *stop;
352         *stop = '\0';
353         if (level == LogCHAT || strstr(ptr, "CONNECT"))
354           log_Printf(level, "Received: %s\n", ptr);
355         *stop = ch;
356         ptr = stop + 1;
357       }
358     }
359   }
360 }
361 
362 static void
363 chat_Read(struct descriptor *d, struct bundle *bundle, const fd_set *fdset)
364 {
365   struct chat *c = descriptor2chat(d);
366 
367   if (c->state == CHAT_EXPECT) {
368     ssize_t in;
369     char *abegin, *ebegin, *begin, *aend, *eend, *end;
370     int n;
371 
372     /*
373      * XXX - should this read only 1 byte to guarantee that we don't
374      * swallow any ppp talk from the peer ?
375      */
376     in = BUFLEFT(c);
377     if (in > sizeof c->buf / 2)
378       in = sizeof c->buf / 2;
379 
380     in = physical_Read(c->physical, c->bufend, in);
381     if (in <= 0)
382       return;
383 
384     /* `begin' and `end' delimit where we're going to strncmp() from */
385     ebegin = c->bufend - c->arglen + 1;
386     eend = ebegin + in;
387     if (ebegin < c->bufstart)
388       ebegin = c->bufstart;
389 
390     if (c->abort.num) {
391       abegin = c->bufend - c->abort.string[0].len + 1;
392       aend = c->bufend - c->abort.string[c->abort.num-1].len + in + 1;
393       if (abegin < c->bufstart)
394         abegin = c->bufstart;
395     } else {
396       abegin = ebegin;
397       aend = eend;
398     }
399     begin = abegin < ebegin ? abegin : ebegin;
400     end = aend < eend ? eend : aend;
401 
402     c->bufend += in;
403 
404     chat_UpdateLog(c, in);
405 
406     if (c->bufend > c->buf + sizeof c->buf / 2) {
407       /* Shuffle our receive buffer back a bit */
408       int chop;
409 
410       for (chop = begin - c->buf; chop; chop--)
411         if (c->buf[chop] == '\n')
412           /* found some already-logged garbage to remove :-) */
413           break;
414 
415       if (!chop)
416         chop = begin - c->buf;
417 
418       if (chop) {
419         char *from, *to;
420 
421         to = c->buf;
422         from = to + chop;
423         while (from < c->bufend)
424           *to++ = *from++;
425         c->bufstart -= chop;
426         c->bufend -= chop;
427         begin -= chop;
428         end -= chop;
429         abegin -= chop;
430         aend -= chop;
431         ebegin -= chop;
432         eend -= chop;
433       }
434     }
435 
436     for (; begin < end; begin++)
437       if (begin >= ebegin && begin < eend &&
438           !strncmp(begin, c->argptr, c->arglen)) {
439         /* Got it ! */
440         timer_Stop(&c->timeout);
441         if (memchr(begin + c->arglen - 1, '\n',
442             c->bufend - begin - c->arglen + 1) == NULL) {
443           /* force it into the log */
444           end = c->bufend;
445           c->bufend = begin + c->arglen;
446           chat_UpdateLog(c, -1);
447           c->bufend = end;
448         }
449         c->bufstart = begin + c->arglen;
450         c->argptr += c->arglen;
451         c->arglen = 0;
452         break;
453       } else if (begin >= abegin && begin < aend) {
454         for (n = c->abort.num - 1; n >= 0; n--) {
455           if (begin + c->abort.string[n].len > c->bufend)
456             break;
457           if (!strncmp(begin, c->abort.string[n].data,
458                        c->abort.string[n].len)) {
459             if (memchr(begin + c->abort.string[n].len - 1, '\n',
460                 c->bufend - begin - c->abort.string[n].len + 1) == NULL) {
461               /* force it into the log */
462               end = c->bufend;
463               c->bufend = begin + c->abort.string[n].len;
464               chat_UpdateLog(c, -1);
465               c->bufend = end;
466             }
467             c->bufstart = begin + c->abort.string[n].len;
468             c->state = CHAT_FAILED;
469             return;
470           }
471         }
472       }
473   }
474 }
475 
476 static int
477 chat_Write(struct descriptor *d, struct bundle *bundle, const fd_set *fdset)
478 {
479   struct chat *c = descriptor2chat(d);
480   int result = 0;
481 
482   if (c->state == CHAT_SEND) {
483     int wrote;
484 
485     if (strstr(c->argv[c->arg], "\\P"))            /* Don't log the password */
486       log_Printf(LogCHAT, "Send: %s\n", c->argv[c->arg]);
487     else {
488       int sz;
489 
490       sz = c->arglen - 1;
491       while (sz >= 0 && c->argptr[sz] == '\n')
492         sz--;
493       log_Printf(LogCHAT, "Send: %.*s\n", sz + 1, c->argptr);
494     }
495 
496     if (physical_IsSync(c->physical)) {
497       /*
498        * XXX: Fix me
499        * This data should be stuffed down through the link layers
500        */
501       /* There's always room for the HDLC header */
502       c->argptr -= 2;
503       c->arglen += 2;
504       memcpy(c->argptr, "\377\003", 2);	/* Prepend HDLC header */
505     }
506 
507     wrote = physical_Write(c->physical, c->argptr, c->arglen);
508     result = wrote ? 1 : 0;
509     if (wrote == -1) {
510       if (errno != EINTR)
511         log_Printf(LogERROR, "chat_Write: %s\n", strerror(errno));
512       if (physical_IsSync(c->physical)) {
513         c->argptr += 2;
514         c->arglen -= 2;
515       }
516     } else if (wrote < 2 && physical_IsSync(c->physical)) {
517       /* Oops - didn't even write our HDLC header ! */
518       c->argptr += 2;
519       c->arglen -= 2;
520     } else {
521       c->argptr += wrote;
522       c->arglen -= wrote;
523     }
524   }
525 
526   return result;
527 }
528 
529 void
530 chat_Init(struct chat *c, struct physical *p, const char *data, int emptybuf,
531           const char *phone)
532 {
533   c->desc.type = CHAT_DESCRIPTOR;
534   c->desc.UpdateSet = chat_UpdateSet;
535   c->desc.IsSet = chat_IsSet;
536   c->desc.Read = chat_Read;
537   c->desc.Write = chat_Write;
538   c->physical = p;
539 
540   c->state = CHAT_EXPECT;
541 
542   if (data == NULL) {
543     *c->script = '\0';
544     c->argc = 0;
545   } else {
546     strncpy(c->script, data, sizeof c->script - 1);
547     c->script[sizeof c->script - 1] = '\0';
548     c->argc =  MakeArgs(c->script, c->argv, VECSIZE(c->argv));
549   }
550 
551   c->arg = -1;
552   c->argptr = NULL;
553   c->nargptr = NULL;
554 
555   if (emptybuf)
556     c->bufstart = c->bufend = c->buf;
557 
558   c->TimeoutSec = 30;
559   c->TimedOut = 0;
560   c->phone = phone;
561   c->abort.num = 0;
562 
563   memset(&c->pause, '\0', sizeof c->pause);
564   memset(&c->timeout, '\0', sizeof c->timeout);
565 }
566 
567 void
568 chat_Destroy(struct chat *c)
569 {
570   timer_Stop(&c->pause);
571   timer_Stop(&c->timeout);
572   while (c->abort.num)
573     free(c->abort.string[--c->abort.num].data);
574   c->abort.num = 0;
575 }
576 
577 /*
578  *  \c	don't add a cr
579  *  \d  Sleep a little (delay 2 seconds
580  *  \n  Line feed character
581  *  \P  Auth Key password
582  *  \p  pause 0.25 sec
583  *  \r	Carrige return character
584  *  \s  Space character
585  *  \T  Telephone number(s) (defined via `set phone')
586  *  \t  Tab character
587  *  \U  Auth User
588  */
589 static char *
590 ExpandString(struct chat *c, const char *str, char *result, int reslen, int cr)
591 {
592   int len;
593 
594   result[--reslen] = '\0';
595   while (*str && reslen > 0) {
596     switch (*str) {
597     case '\\':
598       str++;
599       switch (*str) {
600       case 'c':
601 	cr = 0;
602 	break;
603       case 'd':		/* Delay 2 seconds */
604         chat_Pause(c, 2 * SECTICKS);
605 	break;
606       case 'p':
607         chat_Pause(c, SECTICKS / 4);
608 	break;		/* Delay 0.25 seconds */
609       case 'n':
610 	*result++ = '\n';
611 	reslen--;
612 	break;
613       case 'r':
614 	*result++ = '\r';
615 	reslen--;
616 	break;
617       case 's':
618 	*result++ = ' ';
619 	reslen--;
620 	break;
621       case 't':
622 	*result++ = '\t';
623 	reslen--;
624 	break;
625       case 'P':
626 	strncpy(result, c->physical->dl->bundle->cfg.auth.key, reslen);
627         len = strlen(result);
628 	reslen -= len;
629 	result += len;
630 	break;
631       case 'T':
632         if (c->phone) {
633           strncpy(result, c->phone, reslen);
634           len = strlen(result);
635           reslen -= len;
636           result += len;
637         }
638 	break;
639       case 'U':
640 	strncpy(result, c->physical->dl->bundle->cfg.auth.name, reslen);
641         len = strlen(result);
642 	reslen -= len;
643 	result += len;
644 	break;
645       default:
646 	reslen--;
647 	*result++ = *str;
648 	break;
649       }
650       if (*str)
651 	str++;
652       break;
653     case '^':
654       str++;
655       if (*str) {
656 	*result++ = *str++ & 0x1f;
657 	reslen--;
658       }
659       break;
660     default:
661       *result++ = *str++;
662       reslen--;
663       break;
664     }
665   }
666   if (--reslen > 0) {
667     if (cr)
668       *result++ = '\r';
669   }
670   if (--reslen > 0)
671     *result++ = '\0';
672   return (result);
673 }
674 
675 static void
676 ExecStr(struct physical *physical, char *command, char *out, int olen)
677 {
678   pid_t pid;
679   int fids[2];
680   char *argv[MAXARGS], *vector[MAXARGS], *startout, *endout;
681   int stat, nb, argc;
682 
683   log_Printf(LogCHAT, "Exec: %s\n", command);
684   argc = MakeArgs(command, vector, VECSIZE(vector));
685   command_Expand(argv, argc, (char const *const *)vector,
686                  physical->dl->bundle, 0, getpid());
687 
688   if (pipe(fids) < 0) {
689     log_Printf(LogCHAT, "Unable to create pipe in ExecStr: %s\n",
690 	      strerror(errno));
691     *out = '\0';
692     return;
693   }
694   if ((pid = fork()) == 0) {
695     close(fids[0]);
696     timer_TermService();
697     fids[1] = fcntl(fids[1], F_DUPFD, 4);
698     dup2(physical->fd, STDIN_FILENO);
699     dup2(STDIN_FILENO, STDOUT_FILENO);
700     dup2(fids[1], STDERR_FILENO);
701     close(3);
702     if (open(_PATH_TTY, O_RDWR) == 3)
703       fcntl(3, F_SETFD, 0);	/* Clear close-on-exec flag */
704     else
705       fcntl(3, F_SETFD, 1);	/* Set close-on-exec flag */
706     setuid(geteuid());
707     execvp(argv[0], argv);
708     fprintf(stderr, "execvp: %s: %s\n", argv[0], strerror(errno));
709     exit(127);
710   } else {
711     char *name = strdup(vector[0]);
712 
713     close(fids[1]);
714     endout = out + olen - 1;
715     startout = out;
716     while (out < endout) {
717       nb = read(fids[0], out, 1);
718       if (nb <= 0)
719 	break;
720       out++;
721     }
722     *out = '\0';
723     close(fids[0]);
724     close(fids[1]);
725     waitpid(pid, &stat, WNOHANG);
726     if (WIFSIGNALED(stat)) {
727       log_Printf(LogWARN, "%s: signal %d\n", name, WTERMSIG(stat));
728       free(name);
729       *out = '\0';
730       return;
731     } else if (WIFEXITED(stat)) {
732       switch (WEXITSTATUS(stat)) {
733         case 0:
734           free(name);
735           break;
736         case 127:
737           log_Printf(LogWARN, "%s: %s\n", name, startout);
738           free(name);
739           *out = '\0';
740           return;
741           break;
742         default:
743           log_Printf(LogWARN, "%s: exit %d\n", name, WEXITSTATUS(stat));
744           free(name);
745           *out = '\0';
746           return;
747           break;
748       }
749     } else {
750       log_Printf(LogWARN, "%s: Unexpected exit result\n", name);
751       free(name);
752       *out = '\0';
753       return;
754     }
755   }
756 }
757