dd3915a07ab63621a55f7c9404659c1039d336cd
1 #include <signal.h>
2 #include <sys/wait.h>
3 #include <sys/socket.h>
4 #include <sys/time.h>
5 #include <sys/poll.h>
6 #include <netdb.h>
7 #include <netinet/in.h>
8 #include <arpa/inet.h>
9 #include <syslog.h>
10 #include <pwd.h>
11 #include <grp.h>
12 #include "pkt-line.h"
13 #include "cache.h"
14 #include "exec_cmd.h"
16 static int log_syslog;
17 static int verbose;
18 static int reuseaddr;
20 static const char daemon_usage[] =
21 "git-daemon [--verbose] [--syslog] [--inetd | --port=n] [--export-all]\n"
22 " [--timeout=n] [--init-timeout=n] [--strict-paths]\n"
23 " [--base-path=path] [--user-path | --user-path=path]\n"
24 " [--reuseaddr] [--detach] [--pid-file=file]\n"
25 " [--user=user [[--group=group]] [directory...]";
27 /* List of acceptable pathname prefixes */
28 static char **ok_paths;
29 static int strict_paths;
31 /* If this is set, git-daemon-export-ok is not required */
32 static int export_all_trees;
34 /* Take all paths relative to this one if non-NULL */
35 static char *base_path;
37 /* If defined, ~user notation is allowed and the string is inserted
38 * after ~user/. E.g. a request to git://host/~alice/frotz would
39 * go to /home/alice/pub_git/frotz with --user-path=pub_git.
40 */
41 static const char *user_path;
43 /* Timeout, and initial timeout */
44 static unsigned int timeout;
45 static unsigned int init_timeout;
47 static void logreport(int priority, const char *err, va_list params)
48 {
49 /* We should do a single write so that it is atomic and output
50 * of several processes do not get intermingled. */
51 char buf[1024];
52 int buflen;
53 int maxlen, msglen;
55 /* sizeof(buf) should be big enough for "[pid] \n" */
56 buflen = snprintf(buf, sizeof(buf), "[%ld] ", (long) getpid());
58 maxlen = sizeof(buf) - buflen - 1; /* -1 for our own LF */
59 msglen = vsnprintf(buf + buflen, maxlen, err, params);
61 if (log_syslog) {
62 syslog(priority, "%s", buf);
63 return;
64 }
66 /* maxlen counted our own LF but also counts space given to
67 * vsnprintf for the terminating NUL. We want to make sure that
68 * we have space for our own LF and NUL after the "meat" of the
69 * message, so truncate it at maxlen - 1.
70 */
71 if (msglen > maxlen - 1)
72 msglen = maxlen - 1;
73 else if (msglen < 0)
74 msglen = 0; /* Protect against weird return values. */
75 buflen += msglen;
77 buf[buflen++] = '\n';
78 buf[buflen] = '\0';
80 write(2, buf, buflen);
81 }
83 static void logerror(const char *err, ...)
84 {
85 va_list params;
86 va_start(params, err);
87 logreport(LOG_ERR, err, params);
88 va_end(params);
89 }
91 static void loginfo(const char *err, ...)
92 {
93 va_list params;
94 if (!verbose)
95 return;
96 va_start(params, err);
97 logreport(LOG_INFO, err, params);
98 va_end(params);
99 }
101 static void NORETURN daemon_die(const char *err, va_list params)
102 {
103 logreport(LOG_ERR, err, params);
104 exit(1);
105 }
107 static int avoid_alias(char *p)
108 {
109 int sl, ndot;
111 /*
112 * This resurrects the belts and suspenders paranoia check by HPA
113 * done in <435560F7.4080006@zytor.com> thread, now enter_repo()
114 * does not do getcwd() based path canonicalizations.
115 *
116 * sl becomes true immediately after seeing '/' and continues to
117 * be true as long as dots continue after that without intervening
118 * non-dot character.
119 */
120 if (!p || (*p != '/' && *p != '~'))
121 return -1;
122 sl = 1; ndot = 0;
123 p++;
125 while (1) {
126 char ch = *p++;
127 if (sl) {
128 if (ch == '.')
129 ndot++;
130 else if (ch == '/') {
131 if (ndot < 3)
132 /* reject //, /./ and /../ */
133 return -1;
134 ndot = 0;
135 }
136 else if (ch == 0) {
137 if (0 < ndot && ndot < 3)
138 /* reject /.$ and /..$ */
139 return -1;
140 return 0;
141 }
142 else
143 sl = ndot = 0;
144 }
145 else if (ch == 0)
146 return 0;
147 else if (ch == '/') {
148 sl = 1;
149 ndot = 0;
150 }
151 }
152 }
154 static char *path_ok(char *dir)
155 {
156 static char rpath[PATH_MAX];
157 char *path;
159 if (avoid_alias(dir)) {
160 logerror("'%s': aliased", dir);
161 return NULL;
162 }
164 if (*dir == '~') {
165 if (!user_path) {
166 logerror("'%s': User-path not allowed", dir);
167 return NULL;
168 }
169 if (*user_path) {
170 /* Got either "~alice" or "~alice/foo";
171 * rewrite them to "~alice/%s" or
172 * "~alice/%s/foo".
173 */
174 int namlen, restlen = strlen(dir);
175 char *slash = strchr(dir, '/');
176 if (!slash)
177 slash = dir + restlen;
178 namlen = slash - dir;
179 restlen -= namlen;
180 loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
181 snprintf(rpath, PATH_MAX, "%.*s/%s%.*s",
182 namlen, dir, user_path, restlen, slash);
183 dir = rpath;
184 }
185 }
186 else if (base_path) {
187 if (*dir != '/') {
188 /* Allow only absolute */
189 logerror("'%s': Non-absolute path denied (base-path active)", dir);
190 return NULL;
191 }
192 else {
193 snprintf(rpath, PATH_MAX, "%s%s", base_path, dir);
194 dir = rpath;
195 }
196 }
198 path = enter_repo(dir, strict_paths);
200 if (!path) {
201 logerror("'%s': unable to chdir or not a git archive", dir);
202 return NULL;
203 }
205 if ( ok_paths && *ok_paths ) {
206 char **pp;
207 int pathlen = strlen(path);
209 /* The validation is done on the paths after enter_repo
210 * appends optional {.git,.git/.git} and friends, but
211 * it does not use getcwd(). So if your /pub is
212 * a symlink to /mnt/pub, you can whitelist /pub and
213 * do not have to say /mnt/pub.
214 * Do not say /pub/.
215 */
216 for ( pp = ok_paths ; *pp ; pp++ ) {
217 int len = strlen(*pp);
218 if (len <= pathlen &&
219 !memcmp(*pp, path, len) &&
220 (path[len] == '\0' ||
221 (!strict_paths && path[len] == '/')))
222 return path;
223 }
224 }
225 else {
226 /* be backwards compatible */
227 if (!strict_paths)
228 return path;
229 }
231 logerror("'%s': not in whitelist", path);
232 return NULL; /* Fallthrough. Deny by default */
233 }
235 static int upload(char *dir)
236 {
237 /* Timeout as string */
238 char timeout_buf[64];
239 const char *path;
241 loginfo("Request for '%s'", dir);
243 if (!(path = path_ok(dir)))
244 return -1;
246 /*
247 * Security on the cheap.
248 *
249 * We want a readable HEAD, usable "objects" directory, and
250 * a "git-daemon-export-ok" flag that says that the other side
251 * is ok with us doing this.
252 *
253 * path_ok() uses enter_repo() and does whitelist checking.
254 * We only need to make sure the repository is exported.
255 */
257 if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
258 logerror("'%s': repository not exported.", path);
259 errno = EACCES;
260 return -1;
261 }
263 /*
264 * We'll ignore SIGTERM from now on, we have a
265 * good client.
266 */
267 signal(SIGTERM, SIG_IGN);
269 snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout);
271 /* git-upload-pack only ever reads stuff, so this is safe */
272 execl_git_cmd("upload-pack", "--strict", timeout_buf, ".", NULL);
273 return -1;
274 }
276 static int execute(struct sockaddr *addr)
277 {
278 static char line[1000];
279 int pktlen, len;
281 if (addr) {
282 char addrbuf[256] = "";
283 int port = -1;
285 if (addr->sa_family == AF_INET) {
286 struct sockaddr_in *sin_addr = (void *) addr;
287 inet_ntop(addr->sa_family, &sin_addr->sin_addr, addrbuf, sizeof(addrbuf));
288 port = sin_addr->sin_port;
289 #ifndef NO_IPV6
290 } else if (addr && addr->sa_family == AF_INET6) {
291 struct sockaddr_in6 *sin6_addr = (void *) addr;
293 char *buf = addrbuf;
294 *buf++ = '['; *buf = '\0'; /* stpcpy() is cool */
295 inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(addrbuf) - 1);
296 strcat(buf, "]");
298 port = sin6_addr->sin6_port;
299 #endif
300 }
301 loginfo("Connection from %s:%d", addrbuf, port);
302 }
304 alarm(init_timeout ? init_timeout : timeout);
305 pktlen = packet_read_line(0, line, sizeof(line));
306 alarm(0);
308 len = strlen(line);
309 if (pktlen != len)
310 loginfo("Extended attributes (%d bytes) exist <%.*s>",
311 (int) pktlen - len,
312 (int) pktlen - len, line + len + 1);
313 if (len && line[len-1] == '\n')
314 line[--len] = 0;
316 if (!strncmp("git-upload-pack ", line, 16))
317 return upload(line+16);
319 logerror("Protocol error: '%s'", line);
320 return -1;
321 }
324 /*
325 * We count spawned/reaped separately, just to avoid any
326 * races when updating them from signals. The SIGCHLD handler
327 * will only update children_reaped, and the fork logic will
328 * only update children_spawned.
329 *
330 * MAX_CHILDREN should be a power-of-two to make the modulus
331 * operation cheap. It should also be at least twice
332 * the maximum number of connections we will ever allow.
333 */
334 #define MAX_CHILDREN 128
336 static int max_connections = 25;
338 /* These are updated by the signal handler */
339 static volatile unsigned int children_reaped;
340 static pid_t dead_child[MAX_CHILDREN];
342 /* These are updated by the main loop */
343 static unsigned int children_spawned;
344 static unsigned int children_deleted;
346 static struct child {
347 pid_t pid;
348 int addrlen;
349 struct sockaddr_storage address;
350 } live_child[MAX_CHILDREN];
352 static void add_child(int idx, pid_t pid, struct sockaddr *addr, int addrlen)
353 {
354 live_child[idx].pid = pid;
355 live_child[idx].addrlen = addrlen;
356 memcpy(&live_child[idx].address, addr, addrlen);
357 }
359 /*
360 * Walk from "deleted" to "spawned", and remove child "pid".
361 *
362 * We move everything up by one, since the new "deleted" will
363 * be one higher.
364 */
365 static void remove_child(pid_t pid, unsigned deleted, unsigned spawned)
366 {
367 struct child n;
369 deleted %= MAX_CHILDREN;
370 spawned %= MAX_CHILDREN;
371 if (live_child[deleted].pid == pid) {
372 live_child[deleted].pid = -1;
373 return;
374 }
375 n = live_child[deleted];
376 for (;;) {
377 struct child m;
378 deleted = (deleted + 1) % MAX_CHILDREN;
379 if (deleted == spawned)
380 die("could not find dead child %d\n", pid);
381 m = live_child[deleted];
382 live_child[deleted] = n;
383 if (m.pid == pid)
384 return;
385 n = m;
386 }
387 }
389 /*
390 * This gets called if the number of connections grows
391 * past "max_connections".
392 *
393 * We _should_ start off by searching for connections
394 * from the same IP, and if there is some address wth
395 * multiple connections, we should kill that first.
396 *
397 * As it is, we just "randomly" kill 25% of the connections,
398 * and our pseudo-random generator sucks too. I have no
399 * shame.
400 *
401 * Really, this is just a place-holder for a _real_ algorithm.
402 */
403 static void kill_some_children(int signo, unsigned start, unsigned stop)
404 {
405 start %= MAX_CHILDREN;
406 stop %= MAX_CHILDREN;
407 while (start != stop) {
408 if (!(start & 3))
409 kill(live_child[start].pid, signo);
410 start = (start + 1) % MAX_CHILDREN;
411 }
412 }
414 static void check_max_connections(void)
415 {
416 for (;;) {
417 int active;
418 unsigned spawned, reaped, deleted;
420 spawned = children_spawned;
421 reaped = children_reaped;
422 deleted = children_deleted;
424 while (deleted < reaped) {
425 pid_t pid = dead_child[deleted % MAX_CHILDREN];
426 remove_child(pid, deleted, spawned);
427 deleted++;
428 }
429 children_deleted = deleted;
431 active = spawned - deleted;
432 if (active <= max_connections)
433 break;
435 /* Kill some unstarted connections with SIGTERM */
436 kill_some_children(SIGTERM, deleted, spawned);
437 if (active <= max_connections << 1)
438 break;
440 /* If the SIGTERM thing isn't helping use SIGKILL */
441 kill_some_children(SIGKILL, deleted, spawned);
442 sleep(1);
443 }
444 }
446 static void handle(int incoming, struct sockaddr *addr, int addrlen)
447 {
448 pid_t pid = fork();
450 if (pid) {
451 unsigned idx;
453 close(incoming);
454 if (pid < 0)
455 return;
457 idx = children_spawned % MAX_CHILDREN;
458 children_spawned++;
459 add_child(idx, pid, addr, addrlen);
461 check_max_connections();
462 return;
463 }
465 dup2(incoming, 0);
466 dup2(incoming, 1);
467 close(incoming);
469 exit(execute(addr));
470 }
472 static void child_handler(int signo)
473 {
474 for (;;) {
475 int status;
476 pid_t pid = waitpid(-1, &status, WNOHANG);
478 if (pid > 0) {
479 unsigned reaped = children_reaped;
480 dead_child[reaped % MAX_CHILDREN] = pid;
481 children_reaped = reaped + 1;
482 /* XXX: Custom logging, since we don't wanna getpid() */
483 if (verbose) {
484 const char *dead = "";
485 if (!WIFEXITED(status) || WEXITSTATUS(status) > 0)
486 dead = " (with error)";
487 if (log_syslog)
488 syslog(LOG_INFO, "[%d] Disconnected%s", pid, dead);
489 else
490 fprintf(stderr, "[%d] Disconnected%s\n", pid, dead);
491 }
492 continue;
493 }
494 break;
495 }
496 }
498 static int set_reuse_addr(int sockfd)
499 {
500 int on = 1;
502 if (!reuseaddr)
503 return 0;
504 return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
505 &on, sizeof(on));
506 }
508 #ifndef NO_IPV6
510 static int socksetup(int port, int **socklist_p)
511 {
512 int socknum = 0, *socklist = NULL;
513 int maxfd = -1;
514 char pbuf[NI_MAXSERV];
516 struct addrinfo hints, *ai0, *ai;
517 int gai;
519 sprintf(pbuf, "%d", port);
520 memset(&hints, 0, sizeof(hints));
521 hints.ai_family = AF_UNSPEC;
522 hints.ai_socktype = SOCK_STREAM;
523 hints.ai_protocol = IPPROTO_TCP;
524 hints.ai_flags = AI_PASSIVE;
526 gai = getaddrinfo(NULL, pbuf, &hints, &ai0);
527 if (gai)
528 die("getaddrinfo() failed: %s\n", gai_strerror(gai));
530 for (ai = ai0; ai; ai = ai->ai_next) {
531 int sockfd;
532 int *newlist;
534 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
535 if (sockfd < 0)
536 continue;
537 if (sockfd >= FD_SETSIZE) {
538 error("too large socket descriptor.");
539 close(sockfd);
540 continue;
541 }
543 #ifdef IPV6_V6ONLY
544 if (ai->ai_family == AF_INET6) {
545 int on = 1;
546 setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
547 &on, sizeof(on));
548 /* Note: error is not fatal */
549 }
550 #endif
552 if (set_reuse_addr(sockfd)) {
553 close(sockfd);
554 continue;
555 }
557 if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
558 close(sockfd);
559 continue; /* not fatal */
560 }
561 if (listen(sockfd, 5) < 0) {
562 close(sockfd);
563 continue; /* not fatal */
564 }
566 newlist = realloc(socklist, sizeof(int) * (socknum + 1));
567 if (!newlist)
568 die("memory allocation failed: %s", strerror(errno));
570 socklist = newlist;
571 socklist[socknum++] = sockfd;
573 if (maxfd < sockfd)
574 maxfd = sockfd;
575 }
577 freeaddrinfo(ai0);
579 *socklist_p = socklist;
580 return socknum;
581 }
583 #else /* NO_IPV6 */
585 static int socksetup(int port, int **socklist_p)
586 {
587 struct sockaddr_in sin;
588 int sockfd;
590 sockfd = socket(AF_INET, SOCK_STREAM, 0);
591 if (sockfd < 0)
592 return 0;
594 memset(&sin, 0, sizeof sin);
595 sin.sin_family = AF_INET;
596 sin.sin_addr.s_addr = htonl(INADDR_ANY);
597 sin.sin_port = htons(port);
599 if (set_reuse_addr(sockfd)) {
600 close(sockfd);
601 return 0;
602 }
604 if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
605 close(sockfd);
606 return 0;
607 }
609 if (listen(sockfd, 5) < 0) {
610 close(sockfd);
611 return 0;
612 }
614 *socklist_p = xmalloc(sizeof(int));
615 **socklist_p = sockfd;
616 return 1;
617 }
619 #endif
621 static int service_loop(int socknum, int *socklist)
622 {
623 struct pollfd *pfd;
624 int i;
626 pfd = xcalloc(socknum, sizeof(struct pollfd));
628 for (i = 0; i < socknum; i++) {
629 pfd[i].fd = socklist[i];
630 pfd[i].events = POLLIN;
631 }
633 signal(SIGCHLD, child_handler);
635 for (;;) {
636 int i;
638 if (poll(pfd, socknum, -1) < 0) {
639 if (errno != EINTR) {
640 error("poll failed, resuming: %s",
641 strerror(errno));
642 sleep(1);
643 }
644 continue;
645 }
647 for (i = 0; i < socknum; i++) {
648 if (pfd[i].revents & POLLIN) {
649 struct sockaddr_storage ss;
650 unsigned int sslen = sizeof(ss);
651 int incoming = accept(pfd[i].fd, (struct sockaddr *)&ss, &sslen);
652 if (incoming < 0) {
653 switch (errno) {
654 case EAGAIN:
655 case EINTR:
656 case ECONNABORTED:
657 continue;
658 default:
659 die("accept returned %s", strerror(errno));
660 }
661 }
662 handle(incoming, (struct sockaddr *)&ss, sslen);
663 }
664 }
665 }
666 }
668 /* if any standard file descriptor is missing open it to /dev/null */
669 static void sanitize_stdfds(void)
670 {
671 int fd = open("/dev/null", O_RDWR, 0);
672 while (fd != -1 && fd < 2)
673 fd = dup(fd);
674 if (fd == -1)
675 die("open /dev/null or dup failed: %s", strerror(errno));
676 if (fd > 2)
677 close(fd);
678 }
680 static void daemonize(void)
681 {
682 switch (fork()) {
683 case 0:
684 break;
685 case -1:
686 die("fork failed: %s", strerror(errno));
687 default:
688 exit(0);
689 }
690 if (setsid() == -1)
691 die("setsid failed: %s", strerror(errno));
692 close(0);
693 close(1);
694 close(2);
695 sanitize_stdfds();
696 }
698 static void store_pid(const char *path)
699 {
700 FILE *f = fopen(path, "w");
701 if (!f)
702 die("cannot open pid file %s: %s", path, strerror(errno));
703 fprintf(f, "%d\n", getpid());
704 fclose(f);
705 }
707 static int serve(int port, struct passwd *pass, gid_t gid)
708 {
709 int socknum, *socklist;
711 socknum = socksetup(port, &socklist);
712 if (socknum == 0)
713 die("unable to allocate any listen sockets on port %u", port);
715 if (pass && gid &&
716 (initgroups(pass->pw_name, gid) || setgid (gid) ||
717 setuid(pass->pw_uid)))
718 die("cannot drop privileges");
720 return service_loop(socknum, socklist);
721 }
723 int main(int argc, char **argv)
724 {
725 int port = DEFAULT_GIT_PORT;
726 int inetd_mode = 0;
727 const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
728 int detach = 0;
729 struct passwd *pass = NULL;
730 struct group *group;
731 gid_t gid = 0;
732 int i;
734 /* Without this we cannot rely on waitpid() to tell
735 * what happened to our children.
736 */
737 signal(SIGCHLD, SIG_DFL);
739 for (i = 1; i < argc; i++) {
740 char *arg = argv[i];
742 if (!strncmp(arg, "--port=", 7)) {
743 char *end;
744 unsigned long n;
745 n = strtoul(arg+7, &end, 0);
746 if (arg[7] && !*end) {
747 port = n;
748 continue;
749 }
750 }
751 if (!strcmp(arg, "--inetd")) {
752 inetd_mode = 1;
753 log_syslog = 1;
754 continue;
755 }
756 if (!strcmp(arg, "--verbose")) {
757 verbose = 1;
758 continue;
759 }
760 if (!strcmp(arg, "--syslog")) {
761 log_syslog = 1;
762 continue;
763 }
764 if (!strcmp(arg, "--export-all")) {
765 export_all_trees = 1;
766 continue;
767 }
768 if (!strncmp(arg, "--timeout=", 10)) {
769 timeout = atoi(arg+10);
770 continue;
771 }
772 if (!strncmp(arg, "--init-timeout=", 15)) {
773 init_timeout = atoi(arg+15);
774 continue;
775 }
776 if (!strcmp(arg, "--strict-paths")) {
777 strict_paths = 1;
778 continue;
779 }
780 if (!strncmp(arg, "--base-path=", 12)) {
781 base_path = arg+12;
782 continue;
783 }
784 if (!strcmp(arg, "--reuseaddr")) {
785 reuseaddr = 1;
786 continue;
787 }
788 if (!strcmp(arg, "--user-path")) {
789 user_path = "";
790 continue;
791 }
792 if (!strncmp(arg, "--user-path=", 12)) {
793 user_path = arg + 12;
794 continue;
795 }
796 if (!strncmp(arg, "--pid-file=", 11)) {
797 pid_file = arg + 11;
798 continue;
799 }
800 if (!strcmp(arg, "--detach")) {
801 detach = 1;
802 log_syslog = 1;
803 continue;
804 }
805 if (!strncmp(arg, "--user=", 7)) {
806 user_name = arg + 7;
807 continue;
808 }
809 if (!strncmp(arg, "--group=", 8)) {
810 group_name = arg + 8;
811 continue;
812 }
813 if (!strcmp(arg, "--")) {
814 ok_paths = &argv[i+1];
815 break;
816 } else if (arg[0] != '-') {
817 ok_paths = &argv[i];
818 break;
819 }
821 usage(daemon_usage);
822 }
824 if (inetd_mode && (group_name || user_name))
825 die("--user and --group are incompatible with --inetd");
827 if (group_name && !user_name)
828 die("--group supplied without --user");
830 if (user_name) {
831 pass = getpwnam(user_name);
832 if (!pass)
833 die("user not found - %s", user_name);
835 if (!group_name)
836 gid = pass->pw_gid;
837 else {
838 group = getgrnam(group_name);
839 if (!group)
840 die("group not found - %s", group_name);
842 gid = group->gr_gid;
843 }
844 }
846 if (log_syslog) {
847 openlog("git-daemon", 0, LOG_DAEMON);
848 set_die_routine(daemon_die);
849 }
851 if (strict_paths && (!ok_paths || !*ok_paths))
852 die("option --strict-paths requires a whitelist");
854 if (inetd_mode) {
855 struct sockaddr_storage ss;
856 struct sockaddr *peer = (struct sockaddr *)&ss;
857 socklen_t slen = sizeof(ss);
859 freopen("/dev/null", "w", stderr);
861 if (getpeername(0, peer, &slen))
862 peer = NULL;
864 return execute(peer);
865 }
867 if (detach)
868 daemonize();
869 else
870 sanitize_stdfds();
872 if (pid_file)
873 store_pid(pid_file);
875 return serve(port, pass, gid);
876 }