commit: show interesting ident information in summary
[git/jnareb-git.git] / daemon.c
blob51d9d6b8acfeb445ea9854e9ce8dcff23050d20e
1 #include "cache.h"
2 #include "pkt-line.h"
3 #include "exec_cmd.h"
4 #include "run-command.h"
5 #include "strbuf.h"
7 #include <syslog.h>
9 #ifndef HOST_NAME_MAX
10 #define HOST_NAME_MAX 256
11 #endif
13 #ifndef NI_MAXSERV
14 #define NI_MAXSERV 32
15 #endif
17 static int log_syslog;
18 static int verbose;
19 static int reuseaddr;
21 static const char daemon_usage[] =
22 "git daemon [--verbose] [--syslog] [--export-all]\n"
23 " [--timeout=n] [--init-timeout=n] [--max-connections=n]\n"
24 " [--strict-paths] [--base-path=path] [--base-path-relaxed]\n"
25 " [--user-path | --user-path=path]\n"
26 " [--interpolated-path=path]\n"
27 " [--reuseaddr] [--detach] [--pid-file=file]\n"
28 " [--[enable|disable|allow-override|forbid-override]=service]\n"
29 " [--inetd | [--listen=host_or_ipaddr] [--port=n]\n"
30 " [--user=user [--group=group]]\n"
31 " [directory...]";
33 /* List of acceptable pathname prefixes */
34 static char **ok_paths;
35 static int strict_paths;
37 /* If this is set, git-daemon-export-ok is not required */
38 static int export_all_trees;
40 /* Take all paths relative to this one if non-NULL */
41 static char *base_path;
42 static char *interpolated_path;
43 static int base_path_relaxed;
45 /* Flag indicating client sent extra args. */
46 static int saw_extended_args;
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.
52 static const char *user_path;
54 /* Timeout, and initial timeout */
55 static unsigned int timeout;
56 static unsigned int init_timeout;
58 static char *hostname;
59 static char *canon_hostname;
60 static char *ip_address;
61 static char *tcp_port;
63 static void logreport(int priority, const char *err, va_list params)
65 if (log_syslog) {
66 char buf[1024];
67 vsnprintf(buf, sizeof(buf), err, params);
68 syslog(priority, "%s", buf);
69 } else {
71 * Since stderr is set to linebuffered mode, the
72 * logging of different processes will not overlap
74 fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid());
75 vfprintf(stderr, err, params);
76 fputc('\n', stderr);
80 __attribute__((format (printf, 1, 2)))
81 static void logerror(const char *err, ...)
83 va_list params;
84 va_start(params, err);
85 logreport(LOG_ERR, err, params);
86 va_end(params);
89 __attribute__((format (printf, 1, 2)))
90 static void loginfo(const char *err, ...)
92 va_list params;
93 if (!verbose)
94 return;
95 va_start(params, err);
96 logreport(LOG_INFO, err, params);
97 va_end(params);
100 static void NORETURN daemon_die(const char *err, va_list params)
102 logreport(LOG_ERR, err, params);
103 exit(1);
106 static char *path_ok(char *directory)
108 static char rpath[PATH_MAX];
109 static char interp_path[PATH_MAX];
110 char *path;
111 char *dir;
113 dir = directory;
115 if (daemon_avoid_alias(dir)) {
116 logerror("'%s': aliased", dir);
117 return NULL;
120 if (*dir == '~') {
121 if (!user_path) {
122 logerror("'%s': User-path not allowed", dir);
123 return NULL;
125 if (*user_path) {
126 /* Got either "~alice" or "~alice/foo";
127 * rewrite them to "~alice/%s" or
128 * "~alice/%s/foo".
130 int namlen, restlen = strlen(dir);
131 char *slash = strchr(dir, '/');
132 if (!slash)
133 slash = dir + restlen;
134 namlen = slash - dir;
135 restlen -= namlen;
136 loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
137 snprintf(rpath, PATH_MAX, "%.*s/%s%.*s",
138 namlen, dir, user_path, restlen, slash);
139 dir = rpath;
142 else if (interpolated_path && saw_extended_args) {
143 struct strbuf expanded_path = STRBUF_INIT;
144 struct strbuf_expand_dict_entry dict[] = {
145 { "H", hostname },
146 { "CH", canon_hostname },
147 { "IP", ip_address },
148 { "P", tcp_port },
149 { "D", directory },
150 { NULL }
153 if (*dir != '/') {
154 /* Allow only absolute */
155 logerror("'%s': Non-absolute path denied (interpolated-path active)", dir);
156 return NULL;
159 strbuf_expand(&expanded_path, interpolated_path,
160 strbuf_expand_dict_cb, &dict);
161 strlcpy(interp_path, expanded_path.buf, PATH_MAX);
162 strbuf_release(&expanded_path);
163 loginfo("Interpolated dir '%s'", interp_path);
165 dir = interp_path;
167 else if (base_path) {
168 if (*dir != '/') {
169 /* Allow only absolute */
170 logerror("'%s': Non-absolute path denied (base-path active)", dir);
171 return NULL;
173 snprintf(rpath, PATH_MAX, "%s%s", base_path, dir);
174 dir = rpath;
177 path = enter_repo(dir, strict_paths);
178 if (!path && base_path && base_path_relaxed) {
180 * if we fail and base_path_relaxed is enabled, try without
181 * prefixing the base path
183 dir = directory;
184 path = enter_repo(dir, strict_paths);
187 if (!path) {
188 logerror("'%s' does not appear to be a git repository", dir);
189 return NULL;
192 if ( ok_paths && *ok_paths ) {
193 char **pp;
194 int pathlen = strlen(path);
196 /* The validation is done on the paths after enter_repo
197 * appends optional {.git,.git/.git} and friends, but
198 * it does not use getcwd(). So if your /pub is
199 * a symlink to /mnt/pub, you can whitelist /pub and
200 * do not have to say /mnt/pub.
201 * Do not say /pub/.
203 for ( pp = ok_paths ; *pp ; pp++ ) {
204 int len = strlen(*pp);
205 if (len <= pathlen &&
206 !memcmp(*pp, path, len) &&
207 (path[len] == '\0' ||
208 (!strict_paths && path[len] == '/')))
209 return path;
212 else {
213 /* be backwards compatible */
214 if (!strict_paths)
215 return path;
218 logerror("'%s': not in whitelist", path);
219 return NULL; /* Fallthrough. Deny by default */
222 typedef int (*daemon_service_fn)(void);
223 struct daemon_service {
224 const char *name;
225 const char *config_name;
226 daemon_service_fn fn;
227 int enabled;
228 int overridable;
231 static struct daemon_service *service_looking_at;
232 static int service_enabled;
234 static int git_daemon_config(const char *var, const char *value, void *cb)
236 if (!prefixcmp(var, "daemon.") &&
237 !strcmp(var + 7, service_looking_at->config_name)) {
238 service_enabled = git_config_bool(var, value);
239 return 0;
242 /* we are not interested in parsing any other configuration here */
243 return 0;
246 static int run_service(char *dir, struct daemon_service *service)
248 const char *path;
249 int enabled = service->enabled;
251 loginfo("Request %s for '%s'", service->name, dir);
253 if (!enabled && !service->overridable) {
254 logerror("'%s': service not enabled.", service->name);
255 errno = EACCES;
256 return -1;
259 if (!(path = path_ok(dir)))
260 return -1;
263 * Security on the cheap.
265 * We want a readable HEAD, usable "objects" directory, and
266 * a "git-daemon-export-ok" flag that says that the other side
267 * is ok with us doing this.
269 * path_ok() uses enter_repo() and does whitelist checking.
270 * We only need to make sure the repository is exported.
273 if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
274 logerror("'%s': repository not exported.", path);
275 errno = EACCES;
276 return -1;
279 if (service->overridable) {
280 service_looking_at = service;
281 service_enabled = -1;
282 git_config(git_daemon_config, NULL);
283 if (0 <= service_enabled)
284 enabled = service_enabled;
286 if (!enabled) {
287 logerror("'%s': service not enabled for '%s'",
288 service->name, path);
289 errno = EACCES;
290 return -1;
294 * We'll ignore SIGTERM from now on, we have a
295 * good client.
297 signal(SIGTERM, SIG_IGN);
299 return service->fn();
302 static void copy_to_log(int fd)
304 struct strbuf line = STRBUF_INIT;
305 FILE *fp;
307 fp = fdopen(fd, "r");
308 if (fp == NULL) {
309 logerror("fdopen of error channel failed");
310 close(fd);
311 return;
314 while (strbuf_getline(&line, fp, '\n') != EOF) {
315 logerror("%s", line.buf);
316 strbuf_setlen(&line, 0);
319 strbuf_release(&line);
320 fclose(fp);
323 static int run_service_command(const char **argv)
325 struct child_process cld;
327 memset(&cld, 0, sizeof(cld));
328 cld.argv = argv;
329 cld.git_cmd = 1;
330 cld.err = -1;
331 if (start_command(&cld))
332 return -1;
334 close(0);
335 close(1);
337 copy_to_log(cld.err);
339 return finish_command(&cld);
342 static int upload_pack(void)
344 /* Timeout as string */
345 char timeout_buf[64];
346 const char *argv[] = { "upload-pack", "--strict", timeout_buf, ".", NULL };
348 snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout);
349 return run_service_command(argv);
352 static int upload_archive(void)
354 static const char *argv[] = { "upload-archive", ".", NULL };
355 return run_service_command(argv);
358 static int receive_pack(void)
360 static const char *argv[] = { "receive-pack", ".", NULL };
361 return run_service_command(argv);
364 static struct daemon_service daemon_service[] = {
365 { "upload-archive", "uploadarch", upload_archive, 0, 1 },
366 { "upload-pack", "uploadpack", upload_pack, 1, 1 },
367 { "receive-pack", "receivepack", receive_pack, 0, 1 },
370 static void enable_service(const char *name, int ena)
372 int i;
373 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
374 if (!strcmp(daemon_service[i].name, name)) {
375 daemon_service[i].enabled = ena;
376 return;
379 die("No such service %s", name);
382 static void make_service_overridable(const char *name, int ena)
384 int i;
385 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
386 if (!strcmp(daemon_service[i].name, name)) {
387 daemon_service[i].overridable = ena;
388 return;
391 die("No such service %s", name);
394 static char *xstrdup_tolower(const char *str)
396 char *p, *dup = xstrdup(str);
397 for (p = dup; *p; p++)
398 *p = tolower(*p);
399 return dup;
403 * Read the host as supplied by the client connection.
405 static void parse_host_arg(char *extra_args, int buflen)
407 char *val;
408 int vallen;
409 char *end = extra_args + buflen;
411 if (extra_args < end && *extra_args) {
412 saw_extended_args = 1;
413 if (strncasecmp("host=", extra_args, 5) == 0) {
414 val = extra_args + 5;
415 vallen = strlen(val) + 1;
416 if (*val) {
417 /* Split <host>:<port> at colon. */
418 char *host = val;
419 char *port = strrchr(host, ':');
420 if (port) {
421 *port = 0;
422 port++;
423 free(tcp_port);
424 tcp_port = xstrdup(port);
426 free(hostname);
427 hostname = xstrdup_tolower(host);
430 /* On to the next one */
431 extra_args = val + vallen;
433 if (extra_args < end && *extra_args)
434 die("Invalid request");
438 * Locate canonical hostname and its IP address.
440 if (hostname) {
441 #ifndef NO_IPV6
442 struct addrinfo hints;
443 struct addrinfo *ai;
444 int gai;
445 static char addrbuf[HOST_NAME_MAX + 1];
447 memset(&hints, 0, sizeof(hints));
448 hints.ai_flags = AI_CANONNAME;
450 gai = getaddrinfo(hostname, NULL, &hints, &ai);
451 if (!gai) {
452 struct sockaddr_in *sin_addr = (void *)ai->ai_addr;
454 inet_ntop(AF_INET, &sin_addr->sin_addr,
455 addrbuf, sizeof(addrbuf));
456 free(ip_address);
457 ip_address = xstrdup(addrbuf);
459 free(canon_hostname);
460 canon_hostname = xstrdup(ai->ai_canonname ?
461 ai->ai_canonname : ip_address);
463 freeaddrinfo(ai);
465 #else
466 struct hostent *hent;
467 struct sockaddr_in sa;
468 char **ap;
469 static char addrbuf[HOST_NAME_MAX + 1];
471 hent = gethostbyname(hostname);
473 ap = hent->h_addr_list;
474 memset(&sa, 0, sizeof sa);
475 sa.sin_family = hent->h_addrtype;
476 sa.sin_port = htons(0);
477 memcpy(&sa.sin_addr, *ap, hent->h_length);
479 inet_ntop(hent->h_addrtype, &sa.sin_addr,
480 addrbuf, sizeof(addrbuf));
482 free(canon_hostname);
483 canon_hostname = xstrdup(hent->h_name);
484 free(ip_address);
485 ip_address = xstrdup(addrbuf);
486 #endif
491 static int execute(struct sockaddr *addr)
493 static char line[1000];
494 int pktlen, len, i;
496 if (addr) {
497 char addrbuf[256] = "";
498 int port = -1;
500 if (addr->sa_family == AF_INET) {
501 struct sockaddr_in *sin_addr = (void *) addr;
502 inet_ntop(addr->sa_family, &sin_addr->sin_addr, addrbuf, sizeof(addrbuf));
503 port = ntohs(sin_addr->sin_port);
504 #ifndef NO_IPV6
505 } else if (addr && addr->sa_family == AF_INET6) {
506 struct sockaddr_in6 *sin6_addr = (void *) addr;
508 char *buf = addrbuf;
509 *buf++ = '['; *buf = '\0'; /* stpcpy() is cool */
510 inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(addrbuf) - 1);
511 strcat(buf, "]");
513 port = ntohs(sin6_addr->sin6_port);
514 #endif
516 loginfo("Connection from %s:%d", addrbuf, port);
517 setenv("REMOTE_ADDR", addrbuf, 1);
519 else {
520 unsetenv("REMOTE_ADDR");
523 alarm(init_timeout ? init_timeout : timeout);
524 pktlen = packet_read_line(0, line, sizeof(line));
525 alarm(0);
527 len = strlen(line);
528 if (pktlen != len)
529 loginfo("Extended attributes (%d bytes) exist <%.*s>",
530 (int) pktlen - len,
531 (int) pktlen - len, line + len + 1);
532 if (len && line[len-1] == '\n') {
533 line[--len] = 0;
534 pktlen--;
537 free(hostname);
538 free(canon_hostname);
539 free(ip_address);
540 free(tcp_port);
541 hostname = canon_hostname = ip_address = tcp_port = NULL;
543 if (len != pktlen)
544 parse_host_arg(line + len + 1, pktlen - len - 1);
546 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
547 struct daemon_service *s = &(daemon_service[i]);
548 int namelen = strlen(s->name);
549 if (!prefixcmp(line, "git-") &&
550 !strncmp(s->name, line + 4, namelen) &&
551 line[namelen + 4] == ' ') {
553 * Note: The directory here is probably context sensitive,
554 * and might depend on the actual service being performed.
556 return run_service(line + namelen + 5, s);
560 logerror("Protocol error: '%s'", line);
561 return -1;
564 static int max_connections = 32;
566 static unsigned int live_children;
568 static struct child {
569 struct child *next;
570 pid_t pid;
571 struct sockaddr_storage address;
572 } *firstborn;
574 static void add_child(pid_t pid, struct sockaddr *addr, int addrlen)
576 struct child *newborn, **cradle;
579 * This must be xcalloc() -- we'll compare the whole sockaddr_storage
580 * but individual address may be shorter.
582 newborn = xcalloc(1, sizeof(*newborn));
583 live_children++;
584 newborn->pid = pid;
585 memcpy(&newborn->address, addr, addrlen);
586 for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next)
587 if (!memcmp(&(*cradle)->address, &newborn->address,
588 sizeof(newborn->address)))
589 break;
590 newborn->next = *cradle;
591 *cradle = newborn;
594 static void remove_child(pid_t pid)
596 struct child **cradle, *blanket;
598 for (cradle = &firstborn; (blanket = *cradle); cradle = &blanket->next)
599 if (blanket->pid == pid) {
600 *cradle = blanket->next;
601 live_children--;
602 free(blanket);
603 break;
608 * This gets called if the number of connections grows
609 * past "max_connections".
611 * We kill the newest connection from a duplicate IP.
613 static void kill_some_child(void)
615 const struct child *blanket, *next;
617 if (!(blanket = firstborn))
618 return;
620 for (; (next = blanket->next); blanket = next)
621 if (!memcmp(&blanket->address, &next->address,
622 sizeof(next->address))) {
623 kill(blanket->pid, SIGTERM);
624 break;
628 static void check_dead_children(void)
630 int status;
631 pid_t pid;
633 while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
634 const char *dead = "";
635 remove_child(pid);
636 if (!WIFEXITED(status) || (WEXITSTATUS(status) > 0))
637 dead = " (with error)";
638 loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead);
642 static void handle(int incoming, struct sockaddr *addr, int addrlen)
644 pid_t pid;
646 if (max_connections && live_children >= max_connections) {
647 kill_some_child();
648 sleep(1); /* give it some time to die */
649 check_dead_children();
650 if (live_children >= max_connections) {
651 close(incoming);
652 logerror("Too many children, dropping connection");
653 return;
657 if ((pid = fork())) {
658 close(incoming);
659 if (pid < 0) {
660 logerror("Couldn't fork %s", strerror(errno));
661 return;
664 add_child(pid, addr, addrlen);
665 return;
668 dup2(incoming, 0);
669 dup2(incoming, 1);
670 close(incoming);
672 exit(execute(addr));
675 static void child_handler(int signo)
678 * Otherwise empty handler because systemcalls will get interrupted
679 * upon signal receipt
680 * SysV needs the handler to be rearmed
682 signal(SIGCHLD, child_handler);
685 static int set_reuse_addr(int sockfd)
687 int on = 1;
689 if (!reuseaddr)
690 return 0;
691 return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
692 &on, sizeof(on));
695 #ifndef NO_IPV6
697 static int socksetup(char *listen_addr, int listen_port, int **socklist_p)
699 int socknum = 0, *socklist = NULL;
700 int maxfd = -1;
701 char pbuf[NI_MAXSERV];
702 struct addrinfo hints, *ai0, *ai;
703 int gai;
704 long flags;
706 sprintf(pbuf, "%d", listen_port);
707 memset(&hints, 0, sizeof(hints));
708 hints.ai_family = AF_UNSPEC;
709 hints.ai_socktype = SOCK_STREAM;
710 hints.ai_protocol = IPPROTO_TCP;
711 hints.ai_flags = AI_PASSIVE;
713 gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0);
714 if (gai)
715 die("getaddrinfo() failed: %s", gai_strerror(gai));
717 for (ai = ai0; ai; ai = ai->ai_next) {
718 int sockfd;
720 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
721 if (sockfd < 0)
722 continue;
723 if (sockfd >= FD_SETSIZE) {
724 logerror("Socket descriptor too large");
725 close(sockfd);
726 continue;
729 #ifdef IPV6_V6ONLY
730 if (ai->ai_family == AF_INET6) {
731 int on = 1;
732 setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
733 &on, sizeof(on));
734 /* Note: error is not fatal */
736 #endif
738 if (set_reuse_addr(sockfd)) {
739 close(sockfd);
740 continue;
743 if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
744 close(sockfd);
745 continue; /* not fatal */
747 if (listen(sockfd, 5) < 0) {
748 close(sockfd);
749 continue; /* not fatal */
752 flags = fcntl(sockfd, F_GETFD, 0);
753 if (flags >= 0)
754 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
756 socklist = xrealloc(socklist, sizeof(int) * (socknum + 1));
757 socklist[socknum++] = sockfd;
759 if (maxfd < sockfd)
760 maxfd = sockfd;
763 freeaddrinfo(ai0);
765 *socklist_p = socklist;
766 return socknum;
769 #else /* NO_IPV6 */
771 static int socksetup(char *listen_addr, int listen_port, int **socklist_p)
773 struct sockaddr_in sin;
774 int sockfd;
775 long flags;
777 memset(&sin, 0, sizeof sin);
778 sin.sin_family = AF_INET;
779 sin.sin_port = htons(listen_port);
781 if (listen_addr) {
782 /* Well, host better be an IP address here. */
783 if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0)
784 return 0;
785 } else {
786 sin.sin_addr.s_addr = htonl(INADDR_ANY);
789 sockfd = socket(AF_INET, SOCK_STREAM, 0);
790 if (sockfd < 0)
791 return 0;
793 if (set_reuse_addr(sockfd)) {
794 close(sockfd);
795 return 0;
798 if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
799 close(sockfd);
800 return 0;
803 if (listen(sockfd, 5) < 0) {
804 close(sockfd);
805 return 0;
808 flags = fcntl(sockfd, F_GETFD, 0);
809 if (flags >= 0)
810 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
812 *socklist_p = xmalloc(sizeof(int));
813 **socklist_p = sockfd;
814 return 1;
817 #endif
819 static int service_loop(int socknum, int *socklist)
821 struct pollfd *pfd;
822 int i;
824 pfd = xcalloc(socknum, sizeof(struct pollfd));
826 for (i = 0; i < socknum; i++) {
827 pfd[i].fd = socklist[i];
828 pfd[i].events = POLLIN;
831 signal(SIGCHLD, child_handler);
833 for (;;) {
834 int i;
836 check_dead_children();
838 if (poll(pfd, socknum, -1) < 0) {
839 if (errno != EINTR) {
840 logerror("Poll failed, resuming: %s",
841 strerror(errno));
842 sleep(1);
844 continue;
847 for (i = 0; i < socknum; i++) {
848 if (pfd[i].revents & POLLIN) {
849 struct sockaddr_storage ss;
850 unsigned int sslen = sizeof(ss);
851 int incoming = accept(pfd[i].fd, (struct sockaddr *)&ss, &sslen);
852 if (incoming < 0) {
853 switch (errno) {
854 case EAGAIN:
855 case EINTR:
856 case ECONNABORTED:
857 continue;
858 default:
859 die_errno("accept returned");
862 handle(incoming, (struct sockaddr *)&ss, sslen);
868 /* if any standard file descriptor is missing open it to /dev/null */
869 static void sanitize_stdfds(void)
871 int fd = open("/dev/null", O_RDWR, 0);
872 while (fd != -1 && fd < 2)
873 fd = dup(fd);
874 if (fd == -1)
875 die_errno("open /dev/null or dup failed");
876 if (fd > 2)
877 close(fd);
880 static void daemonize(void)
882 switch (fork()) {
883 case 0:
884 break;
885 case -1:
886 die_errno("fork failed");
887 default:
888 exit(0);
890 if (setsid() == -1)
891 die_errno("setsid failed");
892 close(0);
893 close(1);
894 close(2);
895 sanitize_stdfds();
898 static void store_pid(const char *path)
900 FILE *f = fopen(path, "w");
901 if (!f)
902 die_errno("cannot open pid file '%s'", path);
903 if (fprintf(f, "%"PRIuMAX"\n", (uintmax_t) getpid()) < 0 || fclose(f) != 0)
904 die_errno("failed to write pid file '%s'", path);
907 static int serve(char *listen_addr, int listen_port, struct passwd *pass, gid_t gid)
909 int socknum, *socklist;
911 socknum = socksetup(listen_addr, listen_port, &socklist);
912 if (socknum == 0)
913 die("unable to allocate any listen sockets on host %s port %u",
914 listen_addr, listen_port);
916 if (pass && gid &&
917 (initgroups(pass->pw_name, gid) || setgid (gid) ||
918 setuid(pass->pw_uid)))
919 die("cannot drop privileges");
921 return service_loop(socknum, socklist);
924 int main(int argc, char **argv)
926 int listen_port = 0;
927 char *listen_addr = NULL;
928 int inetd_mode = 0;
929 const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
930 int detach = 0;
931 struct passwd *pass = NULL;
932 struct group *group;
933 gid_t gid = 0;
934 int i;
936 git_extract_argv0_path(argv[0]);
938 for (i = 1; i < argc; i++) {
939 char *arg = argv[i];
941 if (!prefixcmp(arg, "--listen=")) {
942 listen_addr = xstrdup_tolower(arg + 9);
943 continue;
945 if (!prefixcmp(arg, "--port=")) {
946 char *end;
947 unsigned long n;
948 n = strtoul(arg+7, &end, 0);
949 if (arg[7] && !*end) {
950 listen_port = n;
951 continue;
954 if (!strcmp(arg, "--inetd")) {
955 inetd_mode = 1;
956 log_syslog = 1;
957 continue;
959 if (!strcmp(arg, "--verbose")) {
960 verbose = 1;
961 continue;
963 if (!strcmp(arg, "--syslog")) {
964 log_syslog = 1;
965 continue;
967 if (!strcmp(arg, "--export-all")) {
968 export_all_trees = 1;
969 continue;
971 if (!prefixcmp(arg, "--timeout=")) {
972 timeout = atoi(arg+10);
973 continue;
975 if (!prefixcmp(arg, "--init-timeout=")) {
976 init_timeout = atoi(arg+15);
977 continue;
979 if (!prefixcmp(arg, "--max-connections=")) {
980 max_connections = atoi(arg+18);
981 if (max_connections < 0)
982 max_connections = 0; /* unlimited */
983 continue;
985 if (!strcmp(arg, "--strict-paths")) {
986 strict_paths = 1;
987 continue;
989 if (!prefixcmp(arg, "--base-path=")) {
990 base_path = arg+12;
991 continue;
993 if (!strcmp(arg, "--base-path-relaxed")) {
994 base_path_relaxed = 1;
995 continue;
997 if (!prefixcmp(arg, "--interpolated-path=")) {
998 interpolated_path = arg+20;
999 continue;
1001 if (!strcmp(arg, "--reuseaddr")) {
1002 reuseaddr = 1;
1003 continue;
1005 if (!strcmp(arg, "--user-path")) {
1006 user_path = "";
1007 continue;
1009 if (!prefixcmp(arg, "--user-path=")) {
1010 user_path = arg + 12;
1011 continue;
1013 if (!prefixcmp(arg, "--pid-file=")) {
1014 pid_file = arg + 11;
1015 continue;
1017 if (!strcmp(arg, "--detach")) {
1018 detach = 1;
1019 log_syslog = 1;
1020 continue;
1022 if (!prefixcmp(arg, "--user=")) {
1023 user_name = arg + 7;
1024 continue;
1026 if (!prefixcmp(arg, "--group=")) {
1027 group_name = arg + 8;
1028 continue;
1030 if (!prefixcmp(arg, "--enable=")) {
1031 enable_service(arg + 9, 1);
1032 continue;
1034 if (!prefixcmp(arg, "--disable=")) {
1035 enable_service(arg + 10, 0);
1036 continue;
1038 if (!prefixcmp(arg, "--allow-override=")) {
1039 make_service_overridable(arg + 17, 1);
1040 continue;
1042 if (!prefixcmp(arg, "--forbid-override=")) {
1043 make_service_overridable(arg + 18, 0);
1044 continue;
1046 if (!strcmp(arg, "--")) {
1047 ok_paths = &argv[i+1];
1048 break;
1049 } else if (arg[0] != '-') {
1050 ok_paths = &argv[i];
1051 break;
1054 usage(daemon_usage);
1057 if (log_syslog) {
1058 openlog("git-daemon", LOG_PID, LOG_DAEMON);
1059 set_die_routine(daemon_die);
1060 } else
1061 /* avoid splitting a message in the middle */
1062 setvbuf(stderr, NULL, _IOLBF, 0);
1064 if (inetd_mode && (group_name || user_name))
1065 die("--user and --group are incompatible with --inetd");
1067 if (inetd_mode && (listen_port || listen_addr))
1068 die("--listen= and --port= are incompatible with --inetd");
1069 else if (listen_port == 0)
1070 listen_port = DEFAULT_GIT_PORT;
1072 if (group_name && !user_name)
1073 die("--group supplied without --user");
1075 if (user_name) {
1076 pass = getpwnam(user_name);
1077 if (!pass)
1078 die("user not found - %s", user_name);
1080 if (!group_name)
1081 gid = pass->pw_gid;
1082 else {
1083 group = getgrnam(group_name);
1084 if (!group)
1085 die("group not found - %s", group_name);
1087 gid = group->gr_gid;
1091 if (strict_paths && (!ok_paths || !*ok_paths))
1092 die("option --strict-paths requires a whitelist");
1094 if (base_path && !is_directory(base_path))
1095 die("base-path '%s' does not exist or is not a directory",
1096 base_path);
1098 if (inetd_mode) {
1099 struct sockaddr_storage ss;
1100 struct sockaddr *peer = (struct sockaddr *)&ss;
1101 socklen_t slen = sizeof(ss);
1103 if (!freopen("/dev/null", "w", stderr))
1104 die_errno("failed to redirect stderr to /dev/null");
1106 if (getpeername(0, peer, &slen))
1107 peer = NULL;
1109 return execute(peer);
1112 if (detach) {
1113 daemonize();
1114 loginfo("Ready to rumble");
1116 else
1117 sanitize_stdfds();
1119 if (pid_file)
1120 store_pid(pid_file);
1122 return serve(listen_addr, listen_port, pass, gid);