docs: clarify "branch -l"
[git/jnareb-git.git] / daemon.c
blob7d9e1c03e88d7785f4ff0d534563ba5778fbc244
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;
402 static void parse_host_and_port(char *hostport, char **host,
403 char **port)
405 if (*hostport == '[') {
406 char *end;
408 end = strchr(hostport, ']');
409 if (!end)
410 die("Invalid request ('[' without ']')");
411 *end = '\0';
412 *host = hostport + 1;
413 if (!end[1])
414 *port = NULL;
415 else if (end[1] == ':')
416 *port = end + 2;
417 else
418 die("Garbage after end of host part");
419 } else {
420 *host = hostport;
421 *port = strrchr(hostport, ':');
422 if (*port) {
423 **port = '\0';
424 ++*port;
430 * Read the host as supplied by the client connection.
432 static void parse_host_arg(char *extra_args, int buflen)
434 char *val;
435 int vallen;
436 char *end = extra_args + buflen;
438 if (extra_args < end && *extra_args) {
439 saw_extended_args = 1;
440 if (strncasecmp("host=", extra_args, 5) == 0) {
441 val = extra_args + 5;
442 vallen = strlen(val) + 1;
443 if (*val) {
444 /* Split <host>:<port> at colon. */
445 char *host;
446 char *port;
447 parse_host_and_port(val, &host, &port);
448 if (port) {
449 free(tcp_port);
450 tcp_port = xstrdup(port);
452 free(hostname);
453 hostname = xstrdup_tolower(host);
456 /* On to the next one */
457 extra_args = val + vallen;
459 if (extra_args < end && *extra_args)
460 die("Invalid request");
464 * Locate canonical hostname and its IP address.
466 if (hostname) {
467 #ifndef NO_IPV6
468 struct addrinfo hints;
469 struct addrinfo *ai;
470 int gai;
471 static char addrbuf[HOST_NAME_MAX + 1];
473 memset(&hints, 0, sizeof(hints));
474 hints.ai_flags = AI_CANONNAME;
476 gai = getaddrinfo(hostname, NULL, &hints, &ai);
477 if (!gai) {
478 struct sockaddr_in *sin_addr = (void *)ai->ai_addr;
480 inet_ntop(AF_INET, &sin_addr->sin_addr,
481 addrbuf, sizeof(addrbuf));
482 free(ip_address);
483 ip_address = xstrdup(addrbuf);
485 free(canon_hostname);
486 canon_hostname = xstrdup(ai->ai_canonname ?
487 ai->ai_canonname : ip_address);
489 freeaddrinfo(ai);
491 #else
492 struct hostent *hent;
493 struct sockaddr_in sa;
494 char **ap;
495 static char addrbuf[HOST_NAME_MAX + 1];
497 hent = gethostbyname(hostname);
499 ap = hent->h_addr_list;
500 memset(&sa, 0, sizeof sa);
501 sa.sin_family = hent->h_addrtype;
502 sa.sin_port = htons(0);
503 memcpy(&sa.sin_addr, *ap, hent->h_length);
505 inet_ntop(hent->h_addrtype, &sa.sin_addr,
506 addrbuf, sizeof(addrbuf));
508 free(canon_hostname);
509 canon_hostname = xstrdup(hent->h_name);
510 free(ip_address);
511 ip_address = xstrdup(addrbuf);
512 #endif
517 static int execute(struct sockaddr *addr)
519 static char line[1000];
520 int pktlen, len, i;
522 if (addr) {
523 char addrbuf[256] = "";
524 int port = -1;
526 if (addr->sa_family == AF_INET) {
527 struct sockaddr_in *sin_addr = (void *) addr;
528 inet_ntop(addr->sa_family, &sin_addr->sin_addr, addrbuf, sizeof(addrbuf));
529 port = ntohs(sin_addr->sin_port);
530 #ifndef NO_IPV6
531 } else if (addr && addr->sa_family == AF_INET6) {
532 struct sockaddr_in6 *sin6_addr = (void *) addr;
534 char *buf = addrbuf;
535 *buf++ = '['; *buf = '\0'; /* stpcpy() is cool */
536 inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(addrbuf) - 1);
537 strcat(buf, "]");
539 port = ntohs(sin6_addr->sin6_port);
540 #endif
542 loginfo("Connection from %s:%d", addrbuf, port);
543 setenv("REMOTE_ADDR", addrbuf, 1);
545 else {
546 unsetenv("REMOTE_ADDR");
549 alarm(init_timeout ? init_timeout : timeout);
550 pktlen = packet_read_line(0, line, sizeof(line));
551 alarm(0);
553 len = strlen(line);
554 if (pktlen != len)
555 loginfo("Extended attributes (%d bytes) exist <%.*s>",
556 (int) pktlen - len,
557 (int) pktlen - len, line + len + 1);
558 if (len && line[len-1] == '\n') {
559 line[--len] = 0;
560 pktlen--;
563 free(hostname);
564 free(canon_hostname);
565 free(ip_address);
566 free(tcp_port);
567 hostname = canon_hostname = ip_address = tcp_port = NULL;
569 if (len != pktlen)
570 parse_host_arg(line + len + 1, pktlen - len - 1);
572 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
573 struct daemon_service *s = &(daemon_service[i]);
574 int namelen = strlen(s->name);
575 if (!prefixcmp(line, "git-") &&
576 !strncmp(s->name, line + 4, namelen) &&
577 line[namelen + 4] == ' ') {
579 * Note: The directory here is probably context sensitive,
580 * and might depend on the actual service being performed.
582 return run_service(line + namelen + 5, s);
586 logerror("Protocol error: '%s'", line);
587 return -1;
590 static int addrcmp(const struct sockaddr_storage *s1,
591 const struct sockaddr_storage *s2)
593 if (s1->ss_family != s2->ss_family)
594 return s1->ss_family - s2->ss_family;
595 if (s1->ss_family == AF_INET)
596 return memcmp(&((struct sockaddr_in *)s1)->sin_addr,
597 &((struct sockaddr_in *)s2)->sin_addr,
598 sizeof(struct in_addr));
599 #ifndef NO_IPV6
600 if (s1->ss_family == AF_INET6)
601 return memcmp(&((struct sockaddr_in6 *)s1)->sin6_addr,
602 &((struct sockaddr_in6 *)s2)->sin6_addr,
603 sizeof(struct in6_addr));
604 #endif
605 return 0;
608 static int max_connections = 32;
610 static unsigned int live_children;
612 static struct child {
613 struct child *next;
614 pid_t pid;
615 struct sockaddr_storage address;
616 } *firstborn;
618 static void add_child(pid_t pid, struct sockaddr *addr, int addrlen)
620 struct child *newborn, **cradle;
622 newborn = xcalloc(1, sizeof(*newborn));
623 live_children++;
624 newborn->pid = pid;
625 memcpy(&newborn->address, addr, addrlen);
626 for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next)
627 if (!addrcmp(&(*cradle)->address, &newborn->address))
628 break;
629 newborn->next = *cradle;
630 *cradle = newborn;
633 static void remove_child(pid_t pid)
635 struct child **cradle, *blanket;
637 for (cradle = &firstborn; (blanket = *cradle); cradle = &blanket->next)
638 if (blanket->pid == pid) {
639 *cradle = blanket->next;
640 live_children--;
641 free(blanket);
642 break;
647 * This gets called if the number of connections grows
648 * past "max_connections".
650 * We kill the newest connection from a duplicate IP.
652 static void kill_some_child(void)
654 const struct child *blanket, *next;
656 if (!(blanket = firstborn))
657 return;
659 for (; (next = blanket->next); blanket = next)
660 if (!addrcmp(&blanket->address, &next->address)) {
661 kill(blanket->pid, SIGTERM);
662 break;
666 static void check_dead_children(void)
668 int status;
669 pid_t pid;
671 while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
672 const char *dead = "";
673 remove_child(pid);
674 if (!WIFEXITED(status) || (WEXITSTATUS(status) > 0))
675 dead = " (with error)";
676 loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead);
680 static void handle(int incoming, struct sockaddr *addr, int addrlen)
682 pid_t pid;
684 if (max_connections && live_children >= max_connections) {
685 kill_some_child();
686 sleep(1); /* give it some time to die */
687 check_dead_children();
688 if (live_children >= max_connections) {
689 close(incoming);
690 logerror("Too many children, dropping connection");
691 return;
695 if ((pid = fork())) {
696 close(incoming);
697 if (pid < 0) {
698 logerror("Couldn't fork %s", strerror(errno));
699 return;
702 add_child(pid, addr, addrlen);
703 return;
706 dup2(incoming, 0);
707 dup2(incoming, 1);
708 close(incoming);
710 exit(execute(addr));
713 static void child_handler(int signo)
716 * Otherwise empty handler because systemcalls will get interrupted
717 * upon signal receipt
718 * SysV needs the handler to be rearmed
720 signal(SIGCHLD, child_handler);
723 static int set_reuse_addr(int sockfd)
725 int on = 1;
727 if (!reuseaddr)
728 return 0;
729 return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
730 &on, sizeof(on));
733 #ifndef NO_IPV6
735 static int socksetup(char *listen_addr, int listen_port, int **socklist_p)
737 int socknum = 0, *socklist = NULL;
738 int maxfd = -1;
739 char pbuf[NI_MAXSERV];
740 struct addrinfo hints, *ai0, *ai;
741 int gai;
742 long flags;
744 sprintf(pbuf, "%d", listen_port);
745 memset(&hints, 0, sizeof(hints));
746 hints.ai_family = AF_UNSPEC;
747 hints.ai_socktype = SOCK_STREAM;
748 hints.ai_protocol = IPPROTO_TCP;
749 hints.ai_flags = AI_PASSIVE;
751 gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0);
752 if (gai)
753 die("getaddrinfo() failed: %s", gai_strerror(gai));
755 for (ai = ai0; ai; ai = ai->ai_next) {
756 int sockfd;
758 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
759 if (sockfd < 0)
760 continue;
761 if (sockfd >= FD_SETSIZE) {
762 logerror("Socket descriptor too large");
763 close(sockfd);
764 continue;
767 #ifdef IPV6_V6ONLY
768 if (ai->ai_family == AF_INET6) {
769 int on = 1;
770 setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
771 &on, sizeof(on));
772 /* Note: error is not fatal */
774 #endif
776 if (set_reuse_addr(sockfd)) {
777 close(sockfd);
778 continue;
781 if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
782 close(sockfd);
783 continue; /* not fatal */
785 if (listen(sockfd, 5) < 0) {
786 close(sockfd);
787 continue; /* not fatal */
790 flags = fcntl(sockfd, F_GETFD, 0);
791 if (flags >= 0)
792 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
794 socklist = xrealloc(socklist, sizeof(int) * (socknum + 1));
795 socklist[socknum++] = sockfd;
797 if (maxfd < sockfd)
798 maxfd = sockfd;
801 freeaddrinfo(ai0);
803 *socklist_p = socklist;
804 return socknum;
807 #else /* NO_IPV6 */
809 static int socksetup(char *listen_addr, int listen_port, int **socklist_p)
811 struct sockaddr_in sin;
812 int sockfd;
813 long flags;
815 memset(&sin, 0, sizeof sin);
816 sin.sin_family = AF_INET;
817 sin.sin_port = htons(listen_port);
819 if (listen_addr) {
820 /* Well, host better be an IP address here. */
821 if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0)
822 return 0;
823 } else {
824 sin.sin_addr.s_addr = htonl(INADDR_ANY);
827 sockfd = socket(AF_INET, SOCK_STREAM, 0);
828 if (sockfd < 0)
829 return 0;
831 if (set_reuse_addr(sockfd)) {
832 close(sockfd);
833 return 0;
836 if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
837 close(sockfd);
838 return 0;
841 if (listen(sockfd, 5) < 0) {
842 close(sockfd);
843 return 0;
846 flags = fcntl(sockfd, F_GETFD, 0);
847 if (flags >= 0)
848 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
850 *socklist_p = xmalloc(sizeof(int));
851 **socklist_p = sockfd;
852 return 1;
855 #endif
857 static int service_loop(int socknum, int *socklist)
859 struct pollfd *pfd;
860 int i;
862 pfd = xcalloc(socknum, sizeof(struct pollfd));
864 for (i = 0; i < socknum; i++) {
865 pfd[i].fd = socklist[i];
866 pfd[i].events = POLLIN;
869 signal(SIGCHLD, child_handler);
871 for (;;) {
872 int i;
874 check_dead_children();
876 if (poll(pfd, socknum, -1) < 0) {
877 if (errno != EINTR) {
878 logerror("Poll failed, resuming: %s",
879 strerror(errno));
880 sleep(1);
882 continue;
885 for (i = 0; i < socknum; i++) {
886 if (pfd[i].revents & POLLIN) {
887 struct sockaddr_storage ss;
888 unsigned int sslen = sizeof(ss);
889 int incoming = accept(pfd[i].fd, (struct sockaddr *)&ss, &sslen);
890 if (incoming < 0) {
891 switch (errno) {
892 case EAGAIN:
893 case EINTR:
894 case ECONNABORTED:
895 continue;
896 default:
897 die_errno("accept returned");
900 handle(incoming, (struct sockaddr *)&ss, sslen);
906 /* if any standard file descriptor is missing open it to /dev/null */
907 static void sanitize_stdfds(void)
909 int fd = open("/dev/null", O_RDWR, 0);
910 while (fd != -1 && fd < 2)
911 fd = dup(fd);
912 if (fd == -1)
913 die_errno("open /dev/null or dup failed");
914 if (fd > 2)
915 close(fd);
918 static void daemonize(void)
920 switch (fork()) {
921 case 0:
922 break;
923 case -1:
924 die_errno("fork failed");
925 default:
926 exit(0);
928 if (setsid() == -1)
929 die_errno("setsid failed");
930 close(0);
931 close(1);
932 close(2);
933 sanitize_stdfds();
936 static void store_pid(const char *path)
938 FILE *f = fopen(path, "w");
939 if (!f)
940 die_errno("cannot open pid file '%s'", path);
941 if (fprintf(f, "%"PRIuMAX"\n", (uintmax_t) getpid()) < 0 || fclose(f) != 0)
942 die_errno("failed to write pid file '%s'", path);
945 static int serve(char *listen_addr, int listen_port, struct passwd *pass, gid_t gid)
947 int socknum, *socklist;
949 socknum = socksetup(listen_addr, listen_port, &socklist);
950 if (socknum == 0)
951 die("unable to allocate any listen sockets on host %s port %u",
952 listen_addr, listen_port);
954 if (pass && gid &&
955 (initgroups(pass->pw_name, gid) || setgid (gid) ||
956 setuid(pass->pw_uid)))
957 die("cannot drop privileges");
959 return service_loop(socknum, socklist);
962 int main(int argc, char **argv)
964 int listen_port = 0;
965 char *listen_addr = NULL;
966 int inetd_mode = 0;
967 const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
968 int detach = 0;
969 struct passwd *pass = NULL;
970 struct group *group;
971 gid_t gid = 0;
972 int i;
974 git_extract_argv0_path(argv[0]);
976 for (i = 1; i < argc; i++) {
977 char *arg = argv[i];
979 if (!prefixcmp(arg, "--listen=")) {
980 listen_addr = xstrdup_tolower(arg + 9);
981 continue;
983 if (!prefixcmp(arg, "--port=")) {
984 char *end;
985 unsigned long n;
986 n = strtoul(arg+7, &end, 0);
987 if (arg[7] && !*end) {
988 listen_port = n;
989 continue;
992 if (!strcmp(arg, "--inetd")) {
993 inetd_mode = 1;
994 log_syslog = 1;
995 continue;
997 if (!strcmp(arg, "--verbose")) {
998 verbose = 1;
999 continue;
1001 if (!strcmp(arg, "--syslog")) {
1002 log_syslog = 1;
1003 continue;
1005 if (!strcmp(arg, "--export-all")) {
1006 export_all_trees = 1;
1007 continue;
1009 if (!prefixcmp(arg, "--timeout=")) {
1010 timeout = atoi(arg+10);
1011 continue;
1013 if (!prefixcmp(arg, "--init-timeout=")) {
1014 init_timeout = atoi(arg+15);
1015 continue;
1017 if (!prefixcmp(arg, "--max-connections=")) {
1018 max_connections = atoi(arg+18);
1019 if (max_connections < 0)
1020 max_connections = 0; /* unlimited */
1021 continue;
1023 if (!strcmp(arg, "--strict-paths")) {
1024 strict_paths = 1;
1025 continue;
1027 if (!prefixcmp(arg, "--base-path=")) {
1028 base_path = arg+12;
1029 continue;
1031 if (!strcmp(arg, "--base-path-relaxed")) {
1032 base_path_relaxed = 1;
1033 continue;
1035 if (!prefixcmp(arg, "--interpolated-path=")) {
1036 interpolated_path = arg+20;
1037 continue;
1039 if (!strcmp(arg, "--reuseaddr")) {
1040 reuseaddr = 1;
1041 continue;
1043 if (!strcmp(arg, "--user-path")) {
1044 user_path = "";
1045 continue;
1047 if (!prefixcmp(arg, "--user-path=")) {
1048 user_path = arg + 12;
1049 continue;
1051 if (!prefixcmp(arg, "--pid-file=")) {
1052 pid_file = arg + 11;
1053 continue;
1055 if (!strcmp(arg, "--detach")) {
1056 detach = 1;
1057 log_syslog = 1;
1058 continue;
1060 if (!prefixcmp(arg, "--user=")) {
1061 user_name = arg + 7;
1062 continue;
1064 if (!prefixcmp(arg, "--group=")) {
1065 group_name = arg + 8;
1066 continue;
1068 if (!prefixcmp(arg, "--enable=")) {
1069 enable_service(arg + 9, 1);
1070 continue;
1072 if (!prefixcmp(arg, "--disable=")) {
1073 enable_service(arg + 10, 0);
1074 continue;
1076 if (!prefixcmp(arg, "--allow-override=")) {
1077 make_service_overridable(arg + 17, 1);
1078 continue;
1080 if (!prefixcmp(arg, "--forbid-override=")) {
1081 make_service_overridable(arg + 18, 0);
1082 continue;
1084 if (!strcmp(arg, "--")) {
1085 ok_paths = &argv[i+1];
1086 break;
1087 } else if (arg[0] != '-') {
1088 ok_paths = &argv[i];
1089 break;
1092 usage(daemon_usage);
1095 if (log_syslog) {
1096 openlog("git-daemon", LOG_PID, LOG_DAEMON);
1097 set_die_routine(daemon_die);
1098 } else
1099 /* avoid splitting a message in the middle */
1100 setvbuf(stderr, NULL, _IOLBF, 0);
1102 if (inetd_mode && (group_name || user_name))
1103 die("--user and --group are incompatible with --inetd");
1105 if (inetd_mode && (listen_port || listen_addr))
1106 die("--listen= and --port= are incompatible with --inetd");
1107 else if (listen_port == 0)
1108 listen_port = DEFAULT_GIT_PORT;
1110 if (group_name && !user_name)
1111 die("--group supplied without --user");
1113 if (user_name) {
1114 pass = getpwnam(user_name);
1115 if (!pass)
1116 die("user not found - %s", user_name);
1118 if (!group_name)
1119 gid = pass->pw_gid;
1120 else {
1121 group = getgrnam(group_name);
1122 if (!group)
1123 die("group not found - %s", group_name);
1125 gid = group->gr_gid;
1129 if (strict_paths && (!ok_paths || !*ok_paths))
1130 die("option --strict-paths requires a whitelist");
1132 if (base_path && !is_directory(base_path))
1133 die("base-path '%s' does not exist or is not a directory",
1134 base_path);
1136 if (inetd_mode) {
1137 struct sockaddr_storage ss;
1138 struct sockaddr *peer = (struct sockaddr *)&ss;
1139 socklen_t slen = sizeof(ss);
1141 if (!freopen("/dev/null", "w", stderr))
1142 die_errno("failed to redirect stderr to /dev/null");
1144 if (getpeername(0, peer, &slen))
1145 peer = NULL;
1147 return execute(peer);
1150 if (detach) {
1151 daemonize();
1152 loginfo("Ready to rumble");
1154 else
1155 sanitize_stdfds();
1157 if (pid_file)
1158 store_pid(pid_file);
1160 return serve(listen_addr, listen_port, pass, gid);