Merge branch 'jk/show-index'
[git] / daemon.c
1 #include "cache.h"
2 #include "config.h"
3 #include "pkt-line.h"
4 #include "run-command.h"
5 #include "strbuf.h"
6 #include "string-list.h"
7
8 #ifdef NO_INITGROUPS
9 #define initgroups(x, y) (0) /* nothing */
10 #endif
11
12 static enum log_destination {
13         LOG_DESTINATION_UNSET = -1,
14         LOG_DESTINATION_NONE = 0,
15         LOG_DESTINATION_STDERR = 1,
16         LOG_DESTINATION_SYSLOG = 2,
17 } log_destination = LOG_DESTINATION_UNSET;
18 static int verbose;
19 static int reuseaddr;
20 static int informative_errors;
21
22 static const char daemon_usage[] =
23 "git daemon [--verbose] [--syslog] [--export-all]\n"
24 "           [--timeout=<n>] [--init-timeout=<n>] [--max-connections=<n>]\n"
25 "           [--strict-paths] [--base-path=<path>] [--base-path-relaxed]\n"
26 "           [--user-path | --user-path=<path>]\n"
27 "           [--interpolated-path=<path>]\n"
28 "           [--reuseaddr] [--pid-file=<file>]\n"
29 "           [--(enable|disable|allow-override|forbid-override)=<service>]\n"
30 "           [--access-hook=<path>]\n"
31 "           [--inetd | [--listen=<host_or_ipaddr>] [--port=<n>]\n"
32 "                      [--detach] [--user=<user> [--group=<group>]]\n"
33 "           [--log-destination=(stderr|syslog|none)]\n"
34 "           [<directory>...]";
35
36 /* List of acceptable pathname prefixes */
37 static const char **ok_paths;
38 static int strict_paths;
39
40 /* If this is set, git-daemon-export-ok is not required */
41 static int export_all_trees;
42
43 /* Take all paths relative to this one if non-NULL */
44 static const char *base_path;
45 static const char *interpolated_path;
46 static int base_path_relaxed;
47
48 /* If defined, ~user notation is allowed and the string is inserted
49  * after ~user/.  E.g. a request to git://host/~alice/frotz would
50  * go to /home/alice/pub_git/frotz with --user-path=pub_git.
51  */
52 static const char *user_path;
53
54 /* Timeout, and initial timeout */
55 static unsigned int timeout;
56 static unsigned int init_timeout;
57
58 struct hostinfo {
59         struct strbuf hostname;
60         struct strbuf canon_hostname;
61         struct strbuf ip_address;
62         struct strbuf tcp_port;
63         unsigned int hostname_lookup_done:1;
64         unsigned int saw_extended_args:1;
65 };
66
67 static void lookup_hostname(struct hostinfo *hi);
68
69 static const char *get_canon_hostname(struct hostinfo *hi)
70 {
71         lookup_hostname(hi);
72         return hi->canon_hostname.buf;
73 }
74
75 static const char *get_ip_address(struct hostinfo *hi)
76 {
77         lookup_hostname(hi);
78         return hi->ip_address.buf;
79 }
80
81 static void logreport(int priority, const char *err, va_list params)
82 {
83         switch (log_destination) {
84         case LOG_DESTINATION_SYSLOG: {
85                 char buf[1024];
86                 vsnprintf(buf, sizeof(buf), err, params);
87                 syslog(priority, "%s", buf);
88                 break;
89         }
90         case LOG_DESTINATION_STDERR:
91                 /*
92                  * Since stderr is set to buffered mode, the
93                  * logging of different processes will not overlap
94                  * unless they overflow the (rather big) buffers.
95                  */
96                 fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid());
97                 vfprintf(stderr, err, params);
98                 fputc('\n', stderr);
99                 fflush(stderr);
100                 break;
101         case LOG_DESTINATION_NONE:
102                 break;
103         case LOG_DESTINATION_UNSET:
104                 BUG("log destination not initialized correctly");
105         }
106 }
107
108 __attribute__((format (printf, 1, 2)))
109 static void logerror(const char *err, ...)
110 {
111         va_list params;
112         va_start(params, err);
113         logreport(LOG_ERR, err, params);
114         va_end(params);
115 }
116
117 __attribute__((format (printf, 1, 2)))
118 static void loginfo(const char *err, ...)
119 {
120         va_list params;
121         if (!verbose)
122                 return;
123         va_start(params, err);
124         logreport(LOG_INFO, err, params);
125         va_end(params);
126 }
127
128 static void NORETURN daemon_die(const char *err, va_list params)
129 {
130         logreport(LOG_ERR, err, params);
131         exit(1);
132 }
133
134 struct expand_path_context {
135         const char *directory;
136         struct hostinfo *hostinfo;
137 };
138
139 static size_t expand_path(struct strbuf *sb, const char *placeholder, void *ctx)
140 {
141         struct expand_path_context *context = ctx;
142         struct hostinfo *hi = context->hostinfo;
143
144         switch (placeholder[0]) {
145         case 'H':
146                 strbuf_addbuf(sb, &hi->hostname);
147                 return 1;
148         case 'C':
149                 if (placeholder[1] == 'H') {
150                         strbuf_addstr(sb, get_canon_hostname(hi));
151                         return 2;
152                 }
153                 break;
154         case 'I':
155                 if (placeholder[1] == 'P') {
156                         strbuf_addstr(sb, get_ip_address(hi));
157                         return 2;
158                 }
159                 break;
160         case 'P':
161                 strbuf_addbuf(sb, &hi->tcp_port);
162                 return 1;
163         case 'D':
164                 strbuf_addstr(sb, context->directory);
165                 return 1;
166         }
167         return 0;
168 }
169
170 static const char *path_ok(const char *directory, struct hostinfo *hi)
171 {
172         static char rpath[PATH_MAX];
173         static char interp_path[PATH_MAX];
174         size_t rlen;
175         const char *path;
176         const char *dir;
177
178         dir = directory;
179
180         if (daemon_avoid_alias(dir)) {
181                 logerror("'%s': aliased", dir);
182                 return NULL;
183         }
184
185         if (*dir == '~') {
186                 if (!user_path) {
187                         logerror("'%s': User-path not allowed", dir);
188                         return NULL;
189                 }
190                 if (*user_path) {
191                         /* Got either "~alice" or "~alice/foo";
192                          * rewrite them to "~alice/%s" or
193                          * "~alice/%s/foo".
194                          */
195                         int namlen, restlen = strlen(dir);
196                         const char *slash = strchr(dir, '/');
197                         if (!slash)
198                                 slash = dir + restlen;
199                         namlen = slash - dir;
200                         restlen -= namlen;
201                         loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
202                         rlen = snprintf(rpath, sizeof(rpath), "%.*s/%s%.*s",
203                                         namlen, dir, user_path, restlen, slash);
204                         if (rlen >= sizeof(rpath)) {
205                                 logerror("user-path too large: %s", rpath);
206                                 return NULL;
207                         }
208                         dir = rpath;
209                 }
210         }
211         else if (interpolated_path && hi->saw_extended_args) {
212                 struct strbuf expanded_path = STRBUF_INIT;
213                 struct expand_path_context context;
214
215                 context.directory = directory;
216                 context.hostinfo = hi;
217
218                 if (*dir != '/') {
219                         /* Allow only absolute */
220                         logerror("'%s': Non-absolute path denied (interpolated-path active)", dir);
221                         return NULL;
222                 }
223
224                 strbuf_expand(&expanded_path, interpolated_path,
225                               expand_path, &context);
226
227                 rlen = strlcpy(interp_path, expanded_path.buf,
228                                sizeof(interp_path));
229                 if (rlen >= sizeof(interp_path)) {
230                         logerror("interpolated path too large: %s",
231                                  interp_path);
232                         return NULL;
233                 }
234
235                 strbuf_release(&expanded_path);
236                 loginfo("Interpolated dir '%s'", interp_path);
237
238                 dir = interp_path;
239         }
240         else if (base_path) {
241                 if (*dir != '/') {
242                         /* Allow only absolute */
243                         logerror("'%s': Non-absolute path denied (base-path active)", dir);
244                         return NULL;
245                 }
246                 rlen = snprintf(rpath, sizeof(rpath), "%s%s", base_path, dir);
247                 if (rlen >= sizeof(rpath)) {
248                         logerror("base-path too large: %s", rpath);
249                         return NULL;
250                 }
251                 dir = rpath;
252         }
253
254         path = enter_repo(dir, strict_paths);
255         if (!path && base_path && base_path_relaxed) {
256                 /*
257                  * if we fail and base_path_relaxed is enabled, try without
258                  * prefixing the base path
259                  */
260                 dir = directory;
261                 path = enter_repo(dir, strict_paths);
262         }
263
264         if (!path) {
265                 logerror("'%s' does not appear to be a git repository", dir);
266                 return NULL;
267         }
268
269         if ( ok_paths && *ok_paths ) {
270                 const char **pp;
271                 int pathlen = strlen(path);
272
273                 /* The validation is done on the paths after enter_repo
274                  * appends optional {.git,.git/.git} and friends, but
275                  * it does not use getcwd().  So if your /pub is
276                  * a symlink to /mnt/pub, you can whitelist /pub and
277                  * do not have to say /mnt/pub.
278                  * Do not say /pub/.
279                  */
280                 for ( pp = ok_paths ; *pp ; pp++ ) {
281                         int len = strlen(*pp);
282                         if (len <= pathlen &&
283                             !memcmp(*pp, path, len) &&
284                             (path[len] == '\0' ||
285                              (!strict_paths && path[len] == '/')))
286                                 return path;
287                 }
288         }
289         else {
290                 /* be backwards compatible */
291                 if (!strict_paths)
292                         return path;
293         }
294
295         logerror("'%s': not in whitelist", path);
296         return NULL;            /* Fallthrough. Deny by default */
297 }
298
299 typedef int (*daemon_service_fn)(const struct argv_array *env);
300 struct daemon_service {
301         const char *name;
302         const char *config_name;
303         daemon_service_fn fn;
304         int enabled;
305         int overridable;
306 };
307
308 static int daemon_error(const char *dir, const char *msg)
309 {
310         if (!informative_errors)
311                 msg = "access denied or repository not exported";
312         packet_write_fmt(1, "ERR %s: %s", msg, dir);
313         return -1;
314 }
315
316 static const char *access_hook;
317
318 static int run_access_hook(struct daemon_service *service, const char *dir,
319                            const char *path, struct hostinfo *hi)
320 {
321         struct child_process child = CHILD_PROCESS_INIT;
322         struct strbuf buf = STRBUF_INIT;
323         const char *argv[8];
324         const char **arg = argv;
325         char *eol;
326         int seen_errors = 0;
327
328         *arg++ = access_hook;
329         *arg++ = service->name;
330         *arg++ = path;
331         *arg++ = hi->hostname.buf;
332         *arg++ = get_canon_hostname(hi);
333         *arg++ = get_ip_address(hi);
334         *arg++ = hi->tcp_port.buf;
335         *arg = NULL;
336
337         child.use_shell = 1;
338         child.argv = argv;
339         child.no_stdin = 1;
340         child.no_stderr = 1;
341         child.out = -1;
342         if (start_command(&child)) {
343                 logerror("daemon access hook '%s' failed to start",
344                          access_hook);
345                 goto error_return;
346         }
347         if (strbuf_read(&buf, child.out, 0) < 0) {
348                 logerror("failed to read from pipe to daemon access hook '%s'",
349                          access_hook);
350                 strbuf_reset(&buf);
351                 seen_errors = 1;
352         }
353         if (close(child.out) < 0) {
354                 logerror("failed to close pipe to daemon access hook '%s'",
355                          access_hook);
356                 seen_errors = 1;
357         }
358         if (finish_command(&child))
359                 seen_errors = 1;
360
361         if (!seen_errors) {
362                 strbuf_release(&buf);
363                 return 0;
364         }
365
366 error_return:
367         strbuf_ltrim(&buf);
368         if (!buf.len)
369                 strbuf_addstr(&buf, "service rejected");
370         eol = strchr(buf.buf, '\n');
371         if (eol)
372                 *eol = '\0';
373         errno = EACCES;
374         daemon_error(dir, buf.buf);
375         strbuf_release(&buf);
376         return -1;
377 }
378
379 static int run_service(const char *dir, struct daemon_service *service,
380                        struct hostinfo *hi, const struct argv_array *env)
381 {
382         const char *path;
383         int enabled = service->enabled;
384         struct strbuf var = STRBUF_INIT;
385
386         loginfo("Request %s for '%s'", service->name, dir);
387
388         if (!enabled && !service->overridable) {
389                 logerror("'%s': service not enabled.", service->name);
390                 errno = EACCES;
391                 return daemon_error(dir, "service not enabled");
392         }
393
394         if (!(path = path_ok(dir, hi)))
395                 return daemon_error(dir, "no such repository");
396
397         /*
398          * Security on the cheap.
399          *
400          * We want a readable HEAD, usable "objects" directory, and
401          * a "git-daemon-export-ok" flag that says that the other side
402          * is ok with us doing this.
403          *
404          * path_ok() uses enter_repo() and does whitelist checking.
405          * We only need to make sure the repository is exported.
406          */
407
408         if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
409                 logerror("'%s': repository not exported.", path);
410                 errno = EACCES;
411                 return daemon_error(dir, "repository not exported");
412         }
413
414         if (service->overridable) {
415                 strbuf_addf(&var, "daemon.%s", service->config_name);
416                 git_config_get_bool(var.buf, &enabled);
417                 strbuf_release(&var);
418         }
419         if (!enabled) {
420                 logerror("'%s': service not enabled for '%s'",
421                          service->name, path);
422                 errno = EACCES;
423                 return daemon_error(dir, "service not enabled");
424         }
425
426         /*
427          * Optionally, a hook can choose to deny access to the
428          * repository depending on the phase of the moon.
429          */
430         if (access_hook && run_access_hook(service, dir, path, hi))
431                 return -1;
432
433         /*
434          * We'll ignore SIGTERM from now on, we have a
435          * good client.
436          */
437         signal(SIGTERM, SIG_IGN);
438
439         return service->fn(env);
440 }
441
442 static void copy_to_log(int fd)
443 {
444         struct strbuf line = STRBUF_INIT;
445         FILE *fp;
446
447         fp = fdopen(fd, "r");
448         if (fp == NULL) {
449                 logerror("fdopen of error channel failed");
450                 close(fd);
451                 return;
452         }
453
454         while (strbuf_getline_lf(&line, fp) != EOF) {
455                 logerror("%s", line.buf);
456                 strbuf_setlen(&line, 0);
457         }
458
459         strbuf_release(&line);
460         fclose(fp);
461 }
462
463 static int run_service_command(struct child_process *cld)
464 {
465         argv_array_push(&cld->args, ".");
466         cld->git_cmd = 1;
467         cld->err = -1;
468         if (start_command(cld))
469                 return -1;
470
471         close(0);
472         close(1);
473
474         copy_to_log(cld->err);
475
476         return finish_command(cld);
477 }
478
479 static int upload_pack(const struct argv_array *env)
480 {
481         struct child_process cld = CHILD_PROCESS_INIT;
482         argv_array_pushl(&cld.args, "upload-pack", "--strict", NULL);
483         argv_array_pushf(&cld.args, "--timeout=%u", timeout);
484
485         argv_array_pushv(&cld.env_array, env->argv);
486
487         return run_service_command(&cld);
488 }
489
490 static int upload_archive(const struct argv_array *env)
491 {
492         struct child_process cld = CHILD_PROCESS_INIT;
493         argv_array_push(&cld.args, "upload-archive");
494
495         argv_array_pushv(&cld.env_array, env->argv);
496
497         return run_service_command(&cld);
498 }
499
500 static int receive_pack(const struct argv_array *env)
501 {
502         struct child_process cld = CHILD_PROCESS_INIT;
503         argv_array_push(&cld.args, "receive-pack");
504
505         argv_array_pushv(&cld.env_array, env->argv);
506
507         return run_service_command(&cld);
508 }
509
510 static struct daemon_service daemon_service[] = {
511         { "upload-archive", "uploadarch", upload_archive, 0, 1 },
512         { "upload-pack", "uploadpack", upload_pack, 1, 1 },
513         { "receive-pack", "receivepack", receive_pack, 0, 1 },
514 };
515
516 static void enable_service(const char *name, int ena)
517 {
518         int i;
519         for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
520                 if (!strcmp(daemon_service[i].name, name)) {
521                         daemon_service[i].enabled = ena;
522                         return;
523                 }
524         }
525         die("No such service %s", name);
526 }
527
528 static void make_service_overridable(const char *name, int ena)
529 {
530         int i;
531         for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
532                 if (!strcmp(daemon_service[i].name, name)) {
533                         daemon_service[i].overridable = ena;
534                         return;
535                 }
536         }
537         die("No such service %s", name);
538 }
539
540 static void parse_host_and_port(char *hostport, char **host,
541         char **port)
542 {
543         if (*hostport == '[') {
544                 char *end;
545
546                 end = strchr(hostport, ']');
547                 if (!end)
548                         die("Invalid request ('[' without ']')");
549                 *end = '\0';
550                 *host = hostport + 1;
551                 if (!end[1])
552                         *port = NULL;
553                 else if (end[1] == ':')
554                         *port = end + 2;
555                 else
556                         die("Garbage after end of host part");
557         } else {
558                 *host = hostport;
559                 *port = strrchr(hostport, ':');
560                 if (*port) {
561                         **port = '\0';
562                         ++*port;
563                 }
564         }
565 }
566
567 /*
568  * Sanitize a string from the client so that it's OK to be inserted into a
569  * filesystem path. Specifically, we disallow slashes, runs of "..", and
570  * trailing and leading dots, which means that the client cannot escape
571  * our base path via ".." traversal.
572  */
573 static void sanitize_client(struct strbuf *out, const char *in)
574 {
575         for (; *in; in++) {
576                 if (*in == '/')
577                         continue;
578                 if (*in == '.' && (!out->len || out->buf[out->len - 1] == '.'))
579                         continue;
580                 strbuf_addch(out, *in);
581         }
582
583         while (out->len && out->buf[out->len - 1] == '.')
584                 strbuf_setlen(out, out->len - 1);
585 }
586
587 /*
588  * Like sanitize_client, but we also perform any canonicalization
589  * to make life easier on the admin.
590  */
591 static void canonicalize_client(struct strbuf *out, const char *in)
592 {
593         sanitize_client(out, in);
594         strbuf_tolower(out);
595 }
596
597 /*
598  * Read the host as supplied by the client connection.
599  *
600  * Returns a pointer to the character after the NUL byte terminating the host
601  * arguemnt, or 'extra_args' if there is no host arguemnt.
602  */
603 static char *parse_host_arg(struct hostinfo *hi, char *extra_args, int buflen)
604 {
605         char *val;
606         int vallen;
607         char *end = extra_args + buflen;
608
609         if (extra_args < end && *extra_args) {
610                 hi->saw_extended_args = 1;
611                 if (strncasecmp("host=", extra_args, 5) == 0) {
612                         val = extra_args + 5;
613                         vallen = strlen(val) + 1;
614                         loginfo("Extended attribute \"host\": %s", val);
615                         if (*val) {
616                                 /* Split <host>:<port> at colon. */
617                                 char *host;
618                                 char *port;
619                                 parse_host_and_port(val, &host, &port);
620                                 if (port)
621                                         sanitize_client(&hi->tcp_port, port);
622                                 canonicalize_client(&hi->hostname, host);
623                                 hi->hostname_lookup_done = 0;
624                         }
625
626                         /* On to the next one */
627                         extra_args = val + vallen;
628                 }
629                 if (extra_args < end && *extra_args)
630                         die("Invalid request");
631         }
632
633         return extra_args;
634 }
635
636 static void parse_extra_args(struct hostinfo *hi, struct argv_array *env,
637                              char *extra_args, int buflen)
638 {
639         const char *end = extra_args + buflen;
640         struct strbuf git_protocol = STRBUF_INIT;
641
642         /* First look for the host argument */
643         extra_args = parse_host_arg(hi, extra_args, buflen);
644
645         /* Look for additional arguments places after a second NUL byte */
646         for (; extra_args < end; extra_args += strlen(extra_args) + 1) {
647                 const char *arg = extra_args;
648
649                 /*
650                  * Parse the extra arguments, adding most to 'git_protocol'
651                  * which will be used to set the 'GIT_PROTOCOL' envvar in the
652                  * service that will be run.
653                  *
654                  * If there ends up being a particular arg in the future that
655                  * git-daemon needs to parse specificly (like the 'host' arg)
656                  * then it can be parsed here and not added to 'git_protocol'.
657                  */
658                 if (*arg) {
659                         if (git_protocol.len > 0)
660                                 strbuf_addch(&git_protocol, ':');
661                         strbuf_addstr(&git_protocol, arg);
662                 }
663         }
664
665         if (git_protocol.len > 0) {
666                 loginfo("Extended attribute \"protocol\": %s", git_protocol.buf);
667                 argv_array_pushf(env, GIT_PROTOCOL_ENVIRONMENT "=%s",
668                                  git_protocol.buf);
669         }
670         strbuf_release(&git_protocol);
671 }
672
673 /*
674  * Locate canonical hostname and its IP address.
675  */
676 static void lookup_hostname(struct hostinfo *hi)
677 {
678         if (!hi->hostname_lookup_done && hi->hostname.len) {
679 #ifndef NO_IPV6
680                 struct addrinfo hints;
681                 struct addrinfo *ai;
682                 int gai;
683                 static char addrbuf[HOST_NAME_MAX + 1];
684
685                 memset(&hints, 0, sizeof(hints));
686                 hints.ai_flags = AI_CANONNAME;
687
688                 gai = getaddrinfo(hi->hostname.buf, NULL, &hints, &ai);
689                 if (!gai) {
690                         struct sockaddr_in *sin_addr = (void *)ai->ai_addr;
691
692                         inet_ntop(AF_INET, &sin_addr->sin_addr,
693                                   addrbuf, sizeof(addrbuf));
694                         strbuf_addstr(&hi->ip_address, addrbuf);
695
696                         if (ai->ai_canonname)
697                                 sanitize_client(&hi->canon_hostname,
698                                                 ai->ai_canonname);
699                         else
700                                 strbuf_addbuf(&hi->canon_hostname,
701                                               &hi->ip_address);
702
703                         freeaddrinfo(ai);
704                 }
705 #else
706                 struct hostent *hent;
707                 struct sockaddr_in sa;
708                 char **ap;
709                 static char addrbuf[HOST_NAME_MAX + 1];
710
711                 hent = gethostbyname(hi->hostname.buf);
712                 if (hent) {
713                         ap = hent->h_addr_list;
714                         memset(&sa, 0, sizeof sa);
715                         sa.sin_family = hent->h_addrtype;
716                         sa.sin_port = htons(0);
717                         memcpy(&sa.sin_addr, *ap, hent->h_length);
718
719                         inet_ntop(hent->h_addrtype, &sa.sin_addr,
720                                   addrbuf, sizeof(addrbuf));
721
722                         sanitize_client(&hi->canon_hostname, hent->h_name);
723                         strbuf_addstr(&hi->ip_address, addrbuf);
724                 }
725 #endif
726                 hi->hostname_lookup_done = 1;
727         }
728 }
729
730 static void hostinfo_init(struct hostinfo *hi)
731 {
732         memset(hi, 0, sizeof(*hi));
733         strbuf_init(&hi->hostname, 0);
734         strbuf_init(&hi->canon_hostname, 0);
735         strbuf_init(&hi->ip_address, 0);
736         strbuf_init(&hi->tcp_port, 0);
737 }
738
739 static void hostinfo_clear(struct hostinfo *hi)
740 {
741         strbuf_release(&hi->hostname);
742         strbuf_release(&hi->canon_hostname);
743         strbuf_release(&hi->ip_address);
744         strbuf_release(&hi->tcp_port);
745 }
746
747 static void set_keep_alive(int sockfd)
748 {
749         int ka = 1;
750
751         if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0) {
752                 if (errno != ENOTSOCK)
753                         logerror("unable to set SO_KEEPALIVE on socket: %s",
754                                 strerror(errno));
755         }
756 }
757
758 static int execute(void)
759 {
760         char *line = packet_buffer;
761         int pktlen, len, i;
762         char *addr = getenv("REMOTE_ADDR"), *port = getenv("REMOTE_PORT");
763         struct hostinfo hi;
764         struct argv_array env = ARGV_ARRAY_INIT;
765
766         hostinfo_init(&hi);
767
768         if (addr)
769                 loginfo("Connection from %s:%s", addr, port);
770
771         set_keep_alive(0);
772         alarm(init_timeout ? init_timeout : timeout);
773         pktlen = packet_read(0, NULL, NULL, packet_buffer, sizeof(packet_buffer), 0);
774         alarm(0);
775
776         len = strlen(line);
777         if (len && line[len-1] == '\n')
778                 line[len-1] = 0;
779
780         /* parse additional args hidden behind a NUL byte */
781         if (len != pktlen)
782                 parse_extra_args(&hi, &env, line + len + 1, pktlen - len - 1);
783
784         for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
785                 struct daemon_service *s = &(daemon_service[i]);
786                 const char *arg;
787
788                 if (skip_prefix(line, "git-", &arg) &&
789                     skip_prefix(arg, s->name, &arg) &&
790                     *arg++ == ' ') {
791                         /*
792                          * Note: The directory here is probably context sensitive,
793                          * and might depend on the actual service being performed.
794                          */
795                         int rc = run_service(arg, s, &hi, &env);
796                         hostinfo_clear(&hi);
797                         argv_array_clear(&env);
798                         return rc;
799                 }
800         }
801
802         hostinfo_clear(&hi);
803         argv_array_clear(&env);
804         logerror("Protocol error: '%s'", line);
805         return -1;
806 }
807
808 static int addrcmp(const struct sockaddr_storage *s1,
809     const struct sockaddr_storage *s2)
810 {
811         const struct sockaddr *sa1 = (const struct sockaddr*) s1;
812         const struct sockaddr *sa2 = (const struct sockaddr*) s2;
813
814         if (sa1->sa_family != sa2->sa_family)
815                 return sa1->sa_family - sa2->sa_family;
816         if (sa1->sa_family == AF_INET)
817                 return memcmp(&((struct sockaddr_in *)s1)->sin_addr,
818                     &((struct sockaddr_in *)s2)->sin_addr,
819                     sizeof(struct in_addr));
820 #ifndef NO_IPV6
821         if (sa1->sa_family == AF_INET6)
822                 return memcmp(&((struct sockaddr_in6 *)s1)->sin6_addr,
823                     &((struct sockaddr_in6 *)s2)->sin6_addr,
824                     sizeof(struct in6_addr));
825 #endif
826         return 0;
827 }
828
829 static int max_connections = 32;
830
831 static unsigned int live_children;
832
833 static struct child {
834         struct child *next;
835         struct child_process cld;
836         struct sockaddr_storage address;
837 } *firstborn;
838
839 static void add_child(struct child_process *cld, struct sockaddr *addr, socklen_t addrlen)
840 {
841         struct child *newborn, **cradle;
842
843         newborn = xcalloc(1, sizeof(*newborn));
844         live_children++;
845         memcpy(&newborn->cld, cld, sizeof(*cld));
846         memcpy(&newborn->address, addr, addrlen);
847         for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next)
848                 if (!addrcmp(&(*cradle)->address, &newborn->address))
849                         break;
850         newborn->next = *cradle;
851         *cradle = newborn;
852 }
853
854 /*
855  * This gets called if the number of connections grows
856  * past "max_connections".
857  *
858  * We kill the newest connection from a duplicate IP.
859  */
860 static void kill_some_child(void)
861 {
862         const struct child *blanket, *next;
863
864         if (!(blanket = firstborn))
865                 return;
866
867         for (; (next = blanket->next); blanket = next)
868                 if (!addrcmp(&blanket->address, &next->address)) {
869                         kill(blanket->cld.pid, SIGTERM);
870                         break;
871                 }
872 }
873
874 static void check_dead_children(void)
875 {
876         int status;
877         pid_t pid;
878
879         struct child **cradle, *blanket;
880         for (cradle = &firstborn; (blanket = *cradle);)
881                 if ((pid = waitpid(blanket->cld.pid, &status, WNOHANG)) > 1) {
882                         const char *dead = "";
883                         if (status)
884                                 dead = " (with error)";
885                         loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead);
886
887                         /* remove the child */
888                         *cradle = blanket->next;
889                         live_children--;
890                         child_process_clear(&blanket->cld);
891                         free(blanket);
892                 } else
893                         cradle = &blanket->next;
894 }
895
896 static struct argv_array cld_argv = ARGV_ARRAY_INIT;
897 static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen)
898 {
899         struct child_process cld = CHILD_PROCESS_INIT;
900
901         if (max_connections && live_children >= max_connections) {
902                 kill_some_child();
903                 sleep(1);  /* give it some time to die */
904                 check_dead_children();
905                 if (live_children >= max_connections) {
906                         close(incoming);
907                         logerror("Too many children, dropping connection");
908                         return;
909                 }
910         }
911
912         if (addr->sa_family == AF_INET) {
913                 char buf[128] = "";
914                 struct sockaddr_in *sin_addr = (void *) addr;
915                 inet_ntop(addr->sa_family, &sin_addr->sin_addr, buf, sizeof(buf));
916                 argv_array_pushf(&cld.env_array, "REMOTE_ADDR=%s", buf);
917                 argv_array_pushf(&cld.env_array, "REMOTE_PORT=%d",
918                                  ntohs(sin_addr->sin_port));
919 #ifndef NO_IPV6
920         } else if (addr->sa_family == AF_INET6) {
921                 char buf[128] = "";
922                 struct sockaddr_in6 *sin6_addr = (void *) addr;
923                 inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(buf));
924                 argv_array_pushf(&cld.env_array, "REMOTE_ADDR=[%s]", buf);
925                 argv_array_pushf(&cld.env_array, "REMOTE_PORT=%d",
926                                  ntohs(sin6_addr->sin6_port));
927 #endif
928         }
929
930         cld.argv = cld_argv.argv;
931         cld.in = incoming;
932         cld.out = dup(incoming);
933
934         if (start_command(&cld))
935                 logerror("unable to fork");
936         else
937                 add_child(&cld, addr, addrlen);
938 }
939
940 static void child_handler(int signo)
941 {
942         /*
943          * Otherwise empty handler because systemcalls will get interrupted
944          * upon signal receipt
945          * SysV needs the handler to be rearmed
946          */
947         signal(SIGCHLD, child_handler);
948 }
949
950 static int set_reuse_addr(int sockfd)
951 {
952         int on = 1;
953
954         if (!reuseaddr)
955                 return 0;
956         return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
957                           &on, sizeof(on));
958 }
959
960 struct socketlist {
961         int *list;
962         size_t nr;
963         size_t alloc;
964 };
965
966 static const char *ip2str(int family, struct sockaddr *sin, socklen_t len)
967 {
968 #ifdef NO_IPV6
969         static char ip[INET_ADDRSTRLEN];
970 #else
971         static char ip[INET6_ADDRSTRLEN];
972 #endif
973
974         switch (family) {
975 #ifndef NO_IPV6
976         case AF_INET6:
977                 inet_ntop(family, &((struct sockaddr_in6*)sin)->sin6_addr, ip, len);
978                 break;
979 #endif
980         case AF_INET:
981                 inet_ntop(family, &((struct sockaddr_in*)sin)->sin_addr, ip, len);
982                 break;
983         default:
984                 xsnprintf(ip, sizeof(ip), "<unknown>");
985         }
986         return ip;
987 }
988
989 #ifndef NO_IPV6
990
991 static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
992 {
993         int socknum = 0;
994         char pbuf[NI_MAXSERV];
995         struct addrinfo hints, *ai0, *ai;
996         int gai;
997         long flags;
998
999         xsnprintf(pbuf, sizeof(pbuf), "%d", listen_port);
1000         memset(&hints, 0, sizeof(hints));
1001         hints.ai_family = AF_UNSPEC;
1002         hints.ai_socktype = SOCK_STREAM;
1003         hints.ai_protocol = IPPROTO_TCP;
1004         hints.ai_flags = AI_PASSIVE;
1005
1006         gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0);
1007         if (gai) {
1008                 logerror("getaddrinfo() for %s failed: %s", listen_addr, gai_strerror(gai));
1009                 return 0;
1010         }
1011
1012         for (ai = ai0; ai; ai = ai->ai_next) {
1013                 int sockfd;
1014
1015                 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1016                 if (sockfd < 0)
1017                         continue;
1018                 if (sockfd >= FD_SETSIZE) {
1019                         logerror("Socket descriptor too large");
1020                         close(sockfd);
1021                         continue;
1022                 }
1023
1024 #ifdef IPV6_V6ONLY
1025                 if (ai->ai_family == AF_INET6) {
1026                         int on = 1;
1027                         setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
1028                                    &on, sizeof(on));
1029                         /* Note: error is not fatal */
1030                 }
1031 #endif
1032
1033                 if (set_reuse_addr(sockfd)) {
1034                         logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
1035                         close(sockfd);
1036                         continue;
1037                 }
1038
1039                 set_keep_alive(sockfd);
1040
1041                 if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
1042                         logerror("Could not bind to %s: %s",
1043                                  ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
1044                                  strerror(errno));
1045                         close(sockfd);
1046                         continue;       /* not fatal */
1047                 }
1048                 if (listen(sockfd, 5) < 0) {
1049                         logerror("Could not listen to %s: %s",
1050                                  ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
1051                                  strerror(errno));
1052                         close(sockfd);
1053                         continue;       /* not fatal */
1054                 }
1055
1056                 flags = fcntl(sockfd, F_GETFD, 0);
1057                 if (flags >= 0)
1058                         fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
1059
1060                 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
1061                 socklist->list[socklist->nr++] = sockfd;
1062                 socknum++;
1063         }
1064
1065         freeaddrinfo(ai0);
1066
1067         return socknum;
1068 }
1069
1070 #else /* NO_IPV6 */
1071
1072 static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
1073 {
1074         struct sockaddr_in sin;
1075         int sockfd;
1076         long flags;
1077
1078         memset(&sin, 0, sizeof sin);
1079         sin.sin_family = AF_INET;
1080         sin.sin_port = htons(listen_port);
1081
1082         if (listen_addr) {
1083                 /* Well, host better be an IP address here. */
1084                 if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0)
1085                         return 0;
1086         } else {
1087                 sin.sin_addr.s_addr = htonl(INADDR_ANY);
1088         }
1089
1090         sockfd = socket(AF_INET, SOCK_STREAM, 0);
1091         if (sockfd < 0)
1092                 return 0;
1093
1094         if (set_reuse_addr(sockfd)) {
1095                 logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
1096                 close(sockfd);
1097                 return 0;
1098         }
1099
1100         set_keep_alive(sockfd);
1101
1102         if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
1103                 logerror("Could not bind to %s: %s",
1104                          ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
1105                          strerror(errno));
1106                 close(sockfd);
1107                 return 0;
1108         }
1109
1110         if (listen(sockfd, 5) < 0) {
1111                 logerror("Could not listen to %s: %s",
1112                          ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
1113                          strerror(errno));
1114                 close(sockfd);
1115                 return 0;
1116         }
1117
1118         flags = fcntl(sockfd, F_GETFD, 0);
1119         if (flags >= 0)
1120                 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
1121
1122         ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
1123         socklist->list[socklist->nr++] = sockfd;
1124         return 1;
1125 }
1126
1127 #endif
1128
1129 static void socksetup(struct string_list *listen_addr, int listen_port, struct socketlist *socklist)
1130 {
1131         if (!listen_addr->nr)
1132                 setup_named_sock(NULL, listen_port, socklist);
1133         else {
1134                 int i, socknum;
1135                 for (i = 0; i < listen_addr->nr; i++) {
1136                         socknum = setup_named_sock(listen_addr->items[i].string,
1137                                                    listen_port, socklist);
1138
1139                         if (socknum == 0)
1140                                 logerror("unable to allocate any listen sockets for host %s on port %u",
1141                                          listen_addr->items[i].string, listen_port);
1142                 }
1143         }
1144 }
1145
1146 static int service_loop(struct socketlist *socklist)
1147 {
1148         struct pollfd *pfd;
1149         int i;
1150
1151         pfd = xcalloc(socklist->nr, sizeof(struct pollfd));
1152
1153         for (i = 0; i < socklist->nr; i++) {
1154                 pfd[i].fd = socklist->list[i];
1155                 pfd[i].events = POLLIN;
1156         }
1157
1158         signal(SIGCHLD, child_handler);
1159
1160         for (;;) {
1161                 int i;
1162
1163                 check_dead_children();
1164
1165                 if (poll(pfd, socklist->nr, -1) < 0) {
1166                         if (errno != EINTR) {
1167                                 logerror("Poll failed, resuming: %s",
1168                                       strerror(errno));
1169                                 sleep(1);
1170                         }
1171                         continue;
1172                 }
1173
1174                 for (i = 0; i < socklist->nr; i++) {
1175                         if (pfd[i].revents & POLLIN) {
1176                                 union {
1177                                         struct sockaddr sa;
1178                                         struct sockaddr_in sai;
1179 #ifndef NO_IPV6
1180                                         struct sockaddr_in6 sai6;
1181 #endif
1182                                 } ss;
1183                                 socklen_t sslen = sizeof(ss);
1184                                 int incoming = accept(pfd[i].fd, &ss.sa, &sslen);
1185                                 if (incoming < 0) {
1186                                         switch (errno) {
1187                                         case EAGAIN:
1188                                         case EINTR:
1189                                         case ECONNABORTED:
1190                                                 continue;
1191                                         default:
1192                                                 die_errno("accept returned");
1193                                         }
1194                                 }
1195                                 handle(incoming, &ss.sa, sslen);
1196                         }
1197                 }
1198         }
1199 }
1200
1201 #ifdef NO_POSIX_GOODIES
1202
1203 struct credentials;
1204
1205 static void drop_privileges(struct credentials *cred)
1206 {
1207         /* nothing */
1208 }
1209
1210 static struct credentials *prepare_credentials(const char *user_name,
1211     const char *group_name)
1212 {
1213         die("--user not supported on this platform");
1214 }
1215
1216 #else
1217
1218 struct credentials {
1219         struct passwd *pass;
1220         gid_t gid;
1221 };
1222
1223 static void drop_privileges(struct credentials *cred)
1224 {
1225         if (cred && (initgroups(cred->pass->pw_name, cred->gid) ||
1226             setgid (cred->gid) || setuid(cred->pass->pw_uid)))
1227                 die("cannot drop privileges");
1228 }
1229
1230 static struct credentials *prepare_credentials(const char *user_name,
1231     const char *group_name)
1232 {
1233         static struct credentials c;
1234
1235         c.pass = getpwnam(user_name);
1236         if (!c.pass)
1237                 die("user not found - %s", user_name);
1238
1239         if (!group_name)
1240                 c.gid = c.pass->pw_gid;
1241         else {
1242                 struct group *group = getgrnam(group_name);
1243                 if (!group)
1244                         die("group not found - %s", group_name);
1245
1246                 c.gid = group->gr_gid;
1247         }
1248
1249         return &c;
1250 }
1251 #endif
1252
1253 static int serve(struct string_list *listen_addr, int listen_port,
1254     struct credentials *cred)
1255 {
1256         struct socketlist socklist = { NULL, 0, 0 };
1257
1258         socksetup(listen_addr, listen_port, &socklist);
1259         if (socklist.nr == 0)
1260                 die("unable to allocate any listen sockets on port %u",
1261                     listen_port);
1262
1263         drop_privileges(cred);
1264
1265         loginfo("Ready to rumble");
1266
1267         return service_loop(&socklist);
1268 }
1269
1270 int cmd_main(int argc, const char **argv)
1271 {
1272         int listen_port = 0;
1273         struct string_list listen_addr = STRING_LIST_INIT_NODUP;
1274         int serve_mode = 0, inetd_mode = 0;
1275         const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
1276         int detach = 0;
1277         struct credentials *cred = NULL;
1278         int i;
1279
1280         for (i = 1; i < argc; i++) {
1281                 const char *arg = argv[i];
1282                 const char *v;
1283
1284                 if (skip_prefix(arg, "--listen=", &v)) {
1285                         string_list_append(&listen_addr, xstrdup_tolower(v));
1286                         continue;
1287                 }
1288                 if (skip_prefix(arg, "--port=", &v)) {
1289                         char *end;
1290                         unsigned long n;
1291                         n = strtoul(v, &end, 0);
1292                         if (*v && !*end) {
1293                                 listen_port = n;
1294                                 continue;
1295                         }
1296                 }
1297                 if (!strcmp(arg, "--serve")) {
1298                         serve_mode = 1;
1299                         continue;
1300                 }
1301                 if (!strcmp(arg, "--inetd")) {
1302                         inetd_mode = 1;
1303                         continue;
1304                 }
1305                 if (!strcmp(arg, "--verbose")) {
1306                         verbose = 1;
1307                         continue;
1308                 }
1309                 if (!strcmp(arg, "--syslog")) {
1310                         log_destination = LOG_DESTINATION_SYSLOG;
1311                         continue;
1312                 }
1313                 if (skip_prefix(arg, "--log-destination=", &v)) {
1314                         if (!strcmp(v, "syslog")) {
1315                                 log_destination = LOG_DESTINATION_SYSLOG;
1316                                 continue;
1317                         } else if (!strcmp(v, "stderr")) {
1318                                 log_destination = LOG_DESTINATION_STDERR;
1319                                 continue;
1320                         } else if (!strcmp(v, "none")) {
1321                                 log_destination = LOG_DESTINATION_NONE;
1322                                 continue;
1323                         } else
1324                                 die("unknown log destination '%s'", v);
1325                 }
1326                 if (!strcmp(arg, "--export-all")) {
1327                         export_all_trees = 1;
1328                         continue;
1329                 }
1330                 if (skip_prefix(arg, "--access-hook=", &v)) {
1331                         access_hook = v;
1332                         continue;
1333                 }
1334                 if (skip_prefix(arg, "--timeout=", &v)) {
1335                         timeout = atoi(v);
1336                         continue;
1337                 }
1338                 if (skip_prefix(arg, "--init-timeout=", &v)) {
1339                         init_timeout = atoi(v);
1340                         continue;
1341                 }
1342                 if (skip_prefix(arg, "--max-connections=", &v)) {
1343                         max_connections = atoi(v);
1344                         if (max_connections < 0)
1345                                 max_connections = 0;            /* unlimited */
1346                         continue;
1347                 }
1348                 if (!strcmp(arg, "--strict-paths")) {
1349                         strict_paths = 1;
1350                         continue;
1351                 }
1352                 if (skip_prefix(arg, "--base-path=", &v)) {
1353                         base_path = v;
1354                         continue;
1355                 }
1356                 if (!strcmp(arg, "--base-path-relaxed")) {
1357                         base_path_relaxed = 1;
1358                         continue;
1359                 }
1360                 if (skip_prefix(arg, "--interpolated-path=", &v)) {
1361                         interpolated_path = v;
1362                         continue;
1363                 }
1364                 if (!strcmp(arg, "--reuseaddr")) {
1365                         reuseaddr = 1;
1366                         continue;
1367                 }
1368                 if (!strcmp(arg, "--user-path")) {
1369                         user_path = "";
1370                         continue;
1371                 }
1372                 if (skip_prefix(arg, "--user-path=", &v)) {
1373                         user_path = v;
1374                         continue;
1375                 }
1376                 if (skip_prefix(arg, "--pid-file=", &v)) {
1377                         pid_file = v;
1378                         continue;
1379                 }
1380                 if (!strcmp(arg, "--detach")) {
1381                         detach = 1;
1382                         continue;
1383                 }
1384                 if (skip_prefix(arg, "--user=", &v)) {
1385                         user_name = v;
1386                         continue;
1387                 }
1388                 if (skip_prefix(arg, "--group=", &v)) {
1389                         group_name = v;
1390                         continue;
1391                 }
1392                 if (skip_prefix(arg, "--enable=", &v)) {
1393                         enable_service(v, 1);
1394                         continue;
1395                 }
1396                 if (skip_prefix(arg, "--disable=", &v)) {
1397                         enable_service(v, 0);
1398                         continue;
1399                 }
1400                 if (skip_prefix(arg, "--allow-override=", &v)) {
1401                         make_service_overridable(v, 1);
1402                         continue;
1403                 }
1404                 if (skip_prefix(arg, "--forbid-override=", &v)) {
1405                         make_service_overridable(v, 0);
1406                         continue;
1407                 }
1408                 if (!strcmp(arg, "--informative-errors")) {
1409                         informative_errors = 1;
1410                         continue;
1411                 }
1412                 if (!strcmp(arg, "--no-informative-errors")) {
1413                         informative_errors = 0;
1414                         continue;
1415                 }
1416                 if (!strcmp(arg, "--")) {
1417                         ok_paths = &argv[i+1];
1418                         break;
1419                 } else if (arg[0] != '-') {
1420                         ok_paths = &argv[i];
1421                         break;
1422                 }
1423
1424                 usage(daemon_usage);
1425         }
1426
1427         if (log_destination == LOG_DESTINATION_UNSET) {
1428                 if (inetd_mode || detach)
1429                         log_destination = LOG_DESTINATION_SYSLOG;
1430                 else
1431                         log_destination = LOG_DESTINATION_STDERR;
1432         }
1433
1434         if (log_destination == LOG_DESTINATION_SYSLOG) {
1435                 openlog("git-daemon", LOG_PID, LOG_DAEMON);
1436                 set_die_routine(daemon_die);
1437         } else
1438                 /* avoid splitting a message in the middle */
1439                 setvbuf(stderr, NULL, _IOFBF, 4096);
1440
1441         if (inetd_mode && (detach || group_name || user_name))
1442                 die("--detach, --user and --group are incompatible with --inetd");
1443
1444         if (inetd_mode && (listen_port || (listen_addr.nr > 0)))
1445                 die("--listen= and --port= are incompatible with --inetd");
1446         else if (listen_port == 0)
1447                 listen_port = DEFAULT_GIT_PORT;
1448
1449         if (group_name && !user_name)
1450                 die("--group supplied without --user");
1451
1452         if (user_name)
1453                 cred = prepare_credentials(user_name, group_name);
1454
1455         if (strict_paths && (!ok_paths || !*ok_paths))
1456                 die("option --strict-paths requires a whitelist");
1457
1458         if (base_path && !is_directory(base_path))
1459                 die("base-path '%s' does not exist or is not a directory",
1460                     base_path);
1461
1462         if (log_destination != LOG_DESTINATION_STDERR) {
1463                 if (!freopen("/dev/null", "w", stderr))
1464                         die_errno("failed to redirect stderr to /dev/null");
1465         }
1466
1467         if (inetd_mode || serve_mode)
1468                 return execute();
1469
1470         if (detach) {
1471                 if (daemonize())
1472                         die("--detach not supported on this platform");
1473         }
1474
1475         if (pid_file)
1476                 write_file(pid_file, "%"PRIuMAX, (uintmax_t) getpid());
1477
1478         /* prepare argv for serving-processes */
1479         argv_array_push(&cld_argv, argv[0]); /* git-daemon */
1480         argv_array_push(&cld_argv, "--serve");
1481         for (i = 1; i < argc; ++i)
1482                 argv_array_push(&cld_argv, argv[i]);
1483
1484         return serve(&listen_addr, listen_port, cred);
1485 }