Merge branch 'cb/maint-orphan-merge-noclobber'
[git/kirr.git] / daemon.c
blob13435b46674a3a7b123597ab11751459173f3325
1 #include "cache.h"
2 #include "pkt-line.h"
3 #include "exec_cmd.h"
4 #include "run-command.h"
5 #include "strbuf.h"
6 #include "string-list.h"
8 #ifndef HOST_NAME_MAX
9 #define HOST_NAME_MAX 256
10 #endif
12 #ifndef NI_MAXSERV
13 #define NI_MAXSERV 32
14 #endif
16 static int log_syslog;
17 static int verbose;
18 static int reuseaddr;
20 static const char daemon_usage[] =
21 "git daemon [--verbose] [--syslog] [--export-all]\n"
22 " [--timeout=<n>] [--init-timeout=<n>] [--max-connections=<n>]\n"
23 " [--strict-paths] [--base-path=<path>] [--base-path-relaxed]\n"
24 " [--user-path | --user-path=<path>]\n"
25 " [--interpolated-path=<path>]\n"
26 " [--reuseaddr] [--pid-file=<file>]\n"
27 " [--(enable|disable|allow-override|forbid-override)=<service>]\n"
28 " [--inetd | [--listen=<host_or_ipaddr>] [--port=<n>]\n"
29 " [--detach] [--user=<user> [--group=<group>]]\n"
30 " [<directory>...]";
32 /* List of acceptable pathname prefixes */
33 static char **ok_paths;
34 static int strict_paths;
36 /* If this is set, git-daemon-export-ok is not required */
37 static int export_all_trees;
39 /* Take all paths relative to this one if non-NULL */
40 static char *base_path;
41 static char *interpolated_path;
42 static int base_path_relaxed;
44 /* Flag indicating client sent extra args. */
45 static int saw_extended_args;
47 /* If defined, ~user notation is allowed and the string is inserted
48 * after ~user/. E.g. a request to git://host/~alice/frotz would
49 * go to /home/alice/pub_git/frotz with --user-path=pub_git.
51 static const char *user_path;
53 /* Timeout, and initial timeout */
54 static unsigned int timeout;
55 static unsigned int init_timeout;
57 static char *hostname;
58 static char *canon_hostname;
59 static char *ip_address;
60 static char *tcp_port;
62 static void logreport(int priority, const char *err, va_list params)
64 if (log_syslog) {
65 char buf[1024];
66 vsnprintf(buf, sizeof(buf), err, params);
67 syslog(priority, "%s", buf);
68 } else {
70 * Since stderr is set to buffered mode, the
71 * logging of different processes will not overlap
72 * unless they overflow the (rather big) buffers.
74 fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid());
75 vfprintf(stderr, err, params);
76 fputc('\n', stderr);
77 fflush(stderr);
81 __attribute__((format (printf, 1, 2)))
82 static void logerror(const char *err, ...)
84 va_list params;
85 va_start(params, err);
86 logreport(LOG_ERR, err, params);
87 va_end(params);
90 __attribute__((format (printf, 1, 2)))
91 static void loginfo(const char *err, ...)
93 va_list params;
94 if (!verbose)
95 return;
96 va_start(params, err);
97 logreport(LOG_INFO, err, params);
98 va_end(params);
101 static void NORETURN daemon_die(const char *err, va_list params)
103 logreport(LOG_ERR, err, params);
104 exit(1);
107 static char *path_ok(char *directory)
109 static char rpath[PATH_MAX];
110 static char interp_path[PATH_MAX];
111 char *path;
112 char *dir;
114 dir = directory;
116 if (daemon_avoid_alias(dir)) {
117 logerror("'%s': aliased", dir);
118 return NULL;
121 if (*dir == '~') {
122 if (!user_path) {
123 logerror("'%s': User-path not allowed", dir);
124 return NULL;
126 if (*user_path) {
127 /* Got either "~alice" or "~alice/foo";
128 * rewrite them to "~alice/%s" or
129 * "~alice/%s/foo".
131 int namlen, restlen = strlen(dir);
132 char *slash = strchr(dir, '/');
133 if (!slash)
134 slash = dir + restlen;
135 namlen = slash - dir;
136 restlen -= namlen;
137 loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
138 snprintf(rpath, PATH_MAX, "%.*s/%s%.*s",
139 namlen, dir, user_path, restlen, slash);
140 dir = rpath;
143 else if (interpolated_path && saw_extended_args) {
144 struct strbuf expanded_path = STRBUF_INIT;
145 struct strbuf_expand_dict_entry dict[6];
147 dict[0].placeholder = "H"; dict[0].value = hostname;
148 dict[1].placeholder = "CH"; dict[1].value = canon_hostname;
149 dict[2].placeholder = "IP"; dict[2].value = ip_address;
150 dict[3].placeholder = "P"; dict[3].value = tcp_port;
151 dict[4].placeholder = "D"; dict[4].value = directory;
152 dict[5].placeholder = NULL; dict[5].value = 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", NULL, ".", NULL };
348 argv[2] = timeout_buf;
350 snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout);
351 return run_service_command(argv);
354 static int upload_archive(void)
356 static const char *argv[] = { "upload-archive", ".", NULL };
357 return run_service_command(argv);
360 static int receive_pack(void)
362 static const char *argv[] = { "receive-pack", ".", NULL };
363 return run_service_command(argv);
366 static struct daemon_service daemon_service[] = {
367 { "upload-archive", "uploadarch", upload_archive, 0, 1 },
368 { "upload-pack", "uploadpack", upload_pack, 1, 1 },
369 { "receive-pack", "receivepack", receive_pack, 0, 1 },
372 static void enable_service(const char *name, int ena)
374 int i;
375 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
376 if (!strcmp(daemon_service[i].name, name)) {
377 daemon_service[i].enabled = ena;
378 return;
381 die("No such service %s", name);
384 static void make_service_overridable(const char *name, int ena)
386 int i;
387 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
388 if (!strcmp(daemon_service[i].name, name)) {
389 daemon_service[i].overridable = ena;
390 return;
393 die("No such service %s", name);
396 static char *xstrdup_tolower(const char *str)
398 char *p, *dup = xstrdup(str);
399 for (p = dup; *p; p++)
400 *p = tolower(*p);
401 return dup;
404 static void parse_host_and_port(char *hostport, char **host,
405 char **port)
407 if (*hostport == '[') {
408 char *end;
410 end = strchr(hostport, ']');
411 if (!end)
412 die("Invalid request ('[' without ']')");
413 *end = '\0';
414 *host = hostport + 1;
415 if (!end[1])
416 *port = NULL;
417 else if (end[1] == ':')
418 *port = end + 2;
419 else
420 die("Garbage after end of host part");
421 } else {
422 *host = hostport;
423 *port = strrchr(hostport, ':');
424 if (*port) {
425 **port = '\0';
426 ++*port;
432 * Read the host as supplied by the client connection.
434 static void parse_host_arg(char *extra_args, int buflen)
436 char *val;
437 int vallen;
438 char *end = extra_args + buflen;
440 if (extra_args < end && *extra_args) {
441 saw_extended_args = 1;
442 if (strncasecmp("host=", extra_args, 5) == 0) {
443 val = extra_args + 5;
444 vallen = strlen(val) + 1;
445 if (*val) {
446 /* Split <host>:<port> at colon. */
447 char *host;
448 char *port;
449 parse_host_and_port(val, &host, &port);
450 if (port) {
451 free(tcp_port);
452 tcp_port = xstrdup(port);
454 free(hostname);
455 hostname = xstrdup_tolower(host);
458 /* On to the next one */
459 extra_args = val + vallen;
461 if (extra_args < end && *extra_args)
462 die("Invalid request");
466 * Locate canonical hostname and its IP address.
468 if (hostname) {
469 #ifndef NO_IPV6
470 struct addrinfo hints;
471 struct addrinfo *ai;
472 int gai;
473 static char addrbuf[HOST_NAME_MAX + 1];
475 memset(&hints, 0, sizeof(hints));
476 hints.ai_flags = AI_CANONNAME;
478 gai = getaddrinfo(hostname, NULL, &hints, &ai);
479 if (!gai) {
480 struct sockaddr_in *sin_addr = (void *)ai->ai_addr;
482 inet_ntop(AF_INET, &sin_addr->sin_addr,
483 addrbuf, sizeof(addrbuf));
484 free(ip_address);
485 ip_address = xstrdup(addrbuf);
487 free(canon_hostname);
488 canon_hostname = xstrdup(ai->ai_canonname ?
489 ai->ai_canonname : ip_address);
491 freeaddrinfo(ai);
493 #else
494 struct hostent *hent;
495 struct sockaddr_in sa;
496 char **ap;
497 static char addrbuf[HOST_NAME_MAX + 1];
499 hent = gethostbyname(hostname);
501 ap = hent->h_addr_list;
502 memset(&sa, 0, sizeof sa);
503 sa.sin_family = hent->h_addrtype;
504 sa.sin_port = htons(0);
505 memcpy(&sa.sin_addr, *ap, hent->h_length);
507 inet_ntop(hent->h_addrtype, &sa.sin_addr,
508 addrbuf, sizeof(addrbuf));
510 free(canon_hostname);
511 canon_hostname = xstrdup(hent->h_name);
512 free(ip_address);
513 ip_address = xstrdup(addrbuf);
514 #endif
519 static int execute(void)
521 static char line[1000];
522 int pktlen, len, i;
523 char *addr = getenv("REMOTE_ADDR"), *port = getenv("REMOTE_PORT");
525 if (addr)
526 loginfo("Connection from %s:%s", addr, port);
528 alarm(init_timeout ? init_timeout : timeout);
529 pktlen = packet_read_line(0, line, sizeof(line));
530 alarm(0);
532 len = strlen(line);
533 if (pktlen != len)
534 loginfo("Extended attributes (%d bytes) exist <%.*s>",
535 (int) pktlen - len,
536 (int) pktlen - len, line + len + 1);
537 if (len && line[len-1] == '\n') {
538 line[--len] = 0;
539 pktlen--;
542 free(hostname);
543 free(canon_hostname);
544 free(ip_address);
545 free(tcp_port);
546 hostname = canon_hostname = ip_address = tcp_port = NULL;
548 if (len != pktlen)
549 parse_host_arg(line + len + 1, pktlen - len - 1);
551 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
552 struct daemon_service *s = &(daemon_service[i]);
553 int namelen = strlen(s->name);
554 if (!prefixcmp(line, "git-") &&
555 !strncmp(s->name, line + 4, namelen) &&
556 line[namelen + 4] == ' ') {
558 * Note: The directory here is probably context sensitive,
559 * and might depend on the actual service being performed.
561 return run_service(line + namelen + 5, s);
565 logerror("Protocol error: '%s'", line);
566 return -1;
569 static int addrcmp(const struct sockaddr_storage *s1,
570 const struct sockaddr_storage *s2)
572 const struct sockaddr *sa1 = (const struct sockaddr*) s1;
573 const struct sockaddr *sa2 = (const struct sockaddr*) s2;
575 if (sa1->sa_family != sa2->sa_family)
576 return sa1->sa_family - sa2->sa_family;
577 if (sa1->sa_family == AF_INET)
578 return memcmp(&((struct sockaddr_in *)s1)->sin_addr,
579 &((struct sockaddr_in *)s2)->sin_addr,
580 sizeof(struct in_addr));
581 #ifndef NO_IPV6
582 if (sa1->sa_family == AF_INET6)
583 return memcmp(&((struct sockaddr_in6 *)s1)->sin6_addr,
584 &((struct sockaddr_in6 *)s2)->sin6_addr,
585 sizeof(struct in6_addr));
586 #endif
587 return 0;
590 static int max_connections = 32;
592 static unsigned int live_children;
594 static struct child {
595 struct child *next;
596 struct child_process cld;
597 struct sockaddr_storage address;
598 } *firstborn;
600 static void add_child(struct child_process *cld, struct sockaddr *addr, socklen_t addrlen)
602 struct child *newborn, **cradle;
604 newborn = xcalloc(1, sizeof(*newborn));
605 live_children++;
606 memcpy(&newborn->cld, cld, sizeof(*cld));
607 memcpy(&newborn->address, addr, addrlen);
608 for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next)
609 if (!addrcmp(&(*cradle)->address, &newborn->address))
610 break;
611 newborn->next = *cradle;
612 *cradle = newborn;
616 * This gets called if the number of connections grows
617 * past "max_connections".
619 * We kill the newest connection from a duplicate IP.
621 static void kill_some_child(void)
623 const struct child *blanket, *next;
625 if (!(blanket = firstborn))
626 return;
628 for (; (next = blanket->next); blanket = next)
629 if (!addrcmp(&blanket->address, &next->address)) {
630 kill(blanket->cld.pid, SIGTERM);
631 break;
635 static void check_dead_children(void)
637 int status;
638 pid_t pid;
640 struct child **cradle, *blanket;
641 for (cradle = &firstborn; (blanket = *cradle);)
642 if ((pid = waitpid(blanket->cld.pid, &status, WNOHANG)) > 1) {
643 const char *dead = "";
644 if (status)
645 dead = " (with error)";
646 loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead);
648 /* remove the child */
649 *cradle = blanket->next;
650 live_children--;
651 free(blanket);
652 } else
653 cradle = &blanket->next;
656 static char **cld_argv;
657 static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen)
659 struct child_process cld = { 0 };
660 char addrbuf[300] = "REMOTE_ADDR=", portbuf[300];
661 char *env[] = { addrbuf, portbuf, NULL };
663 if (max_connections && live_children >= max_connections) {
664 kill_some_child();
665 sleep(1); /* give it some time to die */
666 check_dead_children();
667 if (live_children >= max_connections) {
668 close(incoming);
669 logerror("Too many children, dropping connection");
670 return;
674 if (addr->sa_family == AF_INET) {
675 struct sockaddr_in *sin_addr = (void *) addr;
676 inet_ntop(addr->sa_family, &sin_addr->sin_addr, addrbuf + 12,
677 sizeof(addrbuf) - 12);
678 snprintf(portbuf, sizeof(portbuf), "REMOTE_PORT=%d",
679 ntohs(sin_addr->sin_port));
680 #ifndef NO_IPV6
681 } else if (addr && addr->sa_family == AF_INET6) {
682 struct sockaddr_in6 *sin6_addr = (void *) addr;
684 char *buf = addrbuf + 12;
685 *buf++ = '['; *buf = '\0'; /* stpcpy() is cool */
686 inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf,
687 sizeof(addrbuf) - 13);
688 strcat(buf, "]");
690 snprintf(portbuf, sizeof(portbuf), "REMOTE_PORT=%d",
691 ntohs(sin6_addr->sin6_port));
692 #endif
695 cld.env = (const char **)env;
696 cld.argv = (const char **)cld_argv;
697 cld.in = incoming;
698 cld.out = dup(incoming);
700 if (start_command(&cld))
701 logerror("unable to fork");
702 else
703 add_child(&cld, addr, addrlen);
704 close(incoming);
707 static void child_handler(int signo)
710 * Otherwise empty handler because systemcalls will get interrupted
711 * upon signal receipt
712 * SysV needs the handler to be rearmed
714 signal(SIGCHLD, child_handler);
717 static int set_reuse_addr(int sockfd)
719 int on = 1;
721 if (!reuseaddr)
722 return 0;
723 return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
724 &on, sizeof(on));
727 struct socketlist {
728 int *list;
729 size_t nr;
730 size_t alloc;
733 #ifndef NO_IPV6
735 static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
737 int socknum = 0;
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 logerror("getaddrinfo() for %s failed: %s", listen_addr, gai_strerror(gai));
754 return 0;
757 for (ai = ai0; ai; ai = ai->ai_next) {
758 int sockfd;
760 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
761 if (sockfd < 0)
762 continue;
763 if (sockfd >= FD_SETSIZE) {
764 logerror("Socket descriptor too large");
765 close(sockfd);
766 continue;
769 #ifdef IPV6_V6ONLY
770 if (ai->ai_family == AF_INET6) {
771 int on = 1;
772 setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
773 &on, sizeof(on));
774 /* Note: error is not fatal */
776 #endif
778 if (set_reuse_addr(sockfd)) {
779 close(sockfd);
780 continue;
783 if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
784 close(sockfd);
785 continue; /* not fatal */
787 if (listen(sockfd, 5) < 0) {
788 close(sockfd);
789 continue; /* not fatal */
792 flags = fcntl(sockfd, F_GETFD, 0);
793 if (flags >= 0)
794 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
796 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
797 socklist->list[socklist->nr++] = sockfd;
798 socknum++;
800 if (maxfd < sockfd)
801 maxfd = sockfd;
804 freeaddrinfo(ai0);
806 return socknum;
809 #else /* NO_IPV6 */
811 static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
813 struct sockaddr_in sin;
814 int sockfd;
815 long flags;
817 memset(&sin, 0, sizeof sin);
818 sin.sin_family = AF_INET;
819 sin.sin_port = htons(listen_port);
821 if (listen_addr) {
822 /* Well, host better be an IP address here. */
823 if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0)
824 return 0;
825 } else {
826 sin.sin_addr.s_addr = htonl(INADDR_ANY);
829 sockfd = socket(AF_INET, SOCK_STREAM, 0);
830 if (sockfd < 0)
831 return 0;
833 if (set_reuse_addr(sockfd)) {
834 close(sockfd);
835 return 0;
838 if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
839 close(sockfd);
840 return 0;
843 if (listen(sockfd, 5) < 0) {
844 close(sockfd);
845 return 0;
848 flags = fcntl(sockfd, F_GETFD, 0);
849 if (flags >= 0)
850 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
852 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
853 socklist->list[socklist->nr++] = sockfd;
854 return 1;
857 #endif
859 static void socksetup(struct string_list *listen_addr, int listen_port, struct socketlist *socklist)
861 if (!listen_addr->nr)
862 setup_named_sock(NULL, listen_port, socklist);
863 else {
864 int i, socknum;
865 for (i = 0; i < listen_addr->nr; i++) {
866 socknum = setup_named_sock(listen_addr->items[i].string,
867 listen_port, socklist);
869 if (socknum == 0)
870 logerror("unable to allocate any listen sockets for host %s on port %u",
871 listen_addr->items[i].string, listen_port);
876 static int service_loop(struct socketlist *socklist)
878 struct pollfd *pfd;
879 int i;
881 pfd = xcalloc(socklist->nr, sizeof(struct pollfd));
883 for (i = 0; i < socklist->nr; i++) {
884 pfd[i].fd = socklist->list[i];
885 pfd[i].events = POLLIN;
888 signal(SIGCHLD, child_handler);
890 for (;;) {
891 int i;
893 check_dead_children();
895 if (poll(pfd, socklist->nr, -1) < 0) {
896 if (errno != EINTR) {
897 logerror("Poll failed, resuming: %s",
898 strerror(errno));
899 sleep(1);
901 continue;
904 for (i = 0; i < socklist->nr; i++) {
905 if (pfd[i].revents & POLLIN) {
906 union {
907 struct sockaddr sa;
908 struct sockaddr_in sai;
909 #ifndef NO_IPV6
910 struct sockaddr_in6 sai6;
911 #endif
912 } ss;
913 socklen_t sslen = sizeof(ss);
914 int incoming = accept(pfd[i].fd, &ss.sa, &sslen);
915 if (incoming < 0) {
916 switch (errno) {
917 case EAGAIN:
918 case EINTR:
919 case ECONNABORTED:
920 continue;
921 default:
922 die_errno("accept returned");
925 handle(incoming, &ss.sa, sslen);
931 /* if any standard file descriptor is missing open it to /dev/null */
932 static void sanitize_stdfds(void)
934 int fd = open("/dev/null", O_RDWR, 0);
935 while (fd != -1 && fd < 2)
936 fd = dup(fd);
937 if (fd == -1)
938 die_errno("open /dev/null or dup failed");
939 if (fd > 2)
940 close(fd);
943 #ifdef NO_POSIX_GOODIES
945 struct credentials;
947 static void drop_privileges(struct credentials *cred)
949 /* nothing */
952 static void daemonize(void)
954 die("--detach not supported on this platform");
957 static struct credentials *prepare_credentials(const char *user_name,
958 const char *group_name)
960 die("--user not supported on this platform");
963 #else
965 struct credentials {
966 struct passwd *pass;
967 gid_t gid;
970 static void drop_privileges(struct credentials *cred)
972 if (cred && (initgroups(cred->pass->pw_name, cred->gid) ||
973 setgid (cred->gid) || setuid(cred->pass->pw_uid)))
974 die("cannot drop privileges");
977 static struct credentials *prepare_credentials(const char *user_name,
978 const char *group_name)
980 static struct credentials c;
982 c.pass = getpwnam(user_name);
983 if (!c.pass)
984 die("user not found - %s", user_name);
986 if (!group_name)
987 c.gid = c.pass->pw_gid;
988 else {
989 struct group *group = getgrnam(group_name);
990 if (!group)
991 die("group not found - %s", group_name);
993 c.gid = group->gr_gid;
996 return &c;
999 static void daemonize(void)
1001 switch (fork()) {
1002 case 0:
1003 break;
1004 case -1:
1005 die_errno("fork failed");
1006 default:
1007 exit(0);
1009 if (setsid() == -1)
1010 die_errno("setsid failed");
1011 close(0);
1012 close(1);
1013 close(2);
1014 sanitize_stdfds();
1016 #endif
1018 static void store_pid(const char *path)
1020 FILE *f = fopen(path, "w");
1021 if (!f)
1022 die_errno("cannot open pid file '%s'", path);
1023 if (fprintf(f, "%"PRIuMAX"\n", (uintmax_t) getpid()) < 0 || fclose(f) != 0)
1024 die_errno("failed to write pid file '%s'", path);
1027 static int serve(struct string_list *listen_addr, int listen_port,
1028 struct credentials *cred)
1030 struct socketlist socklist = { NULL, 0, 0 };
1032 socksetup(listen_addr, listen_port, &socklist);
1033 if (socklist.nr == 0)
1034 die("unable to allocate any listen sockets on port %u",
1035 listen_port);
1037 drop_privileges(cred);
1039 return service_loop(&socklist);
1042 int main(int argc, char **argv)
1044 int listen_port = 0;
1045 struct string_list listen_addr = STRING_LIST_INIT_NODUP;
1046 int serve_mode = 0, inetd_mode = 0;
1047 const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
1048 int detach = 0;
1049 struct credentials *cred = NULL;
1050 int i;
1052 git_extract_argv0_path(argv[0]);
1054 for (i = 1; i < argc; i++) {
1055 char *arg = argv[i];
1057 if (!prefixcmp(arg, "--listen=")) {
1058 string_list_append(&listen_addr, xstrdup_tolower(arg + 9));
1059 continue;
1061 if (!prefixcmp(arg, "--port=")) {
1062 char *end;
1063 unsigned long n;
1064 n = strtoul(arg+7, &end, 0);
1065 if (arg[7] && !*end) {
1066 listen_port = n;
1067 continue;
1070 if (!strcmp(arg, "--serve")) {
1071 serve_mode = 1;
1072 continue;
1074 if (!strcmp(arg, "--inetd")) {
1075 inetd_mode = 1;
1076 log_syslog = 1;
1077 continue;
1079 if (!strcmp(arg, "--verbose")) {
1080 verbose = 1;
1081 continue;
1083 if (!strcmp(arg, "--syslog")) {
1084 log_syslog = 1;
1085 continue;
1087 if (!strcmp(arg, "--export-all")) {
1088 export_all_trees = 1;
1089 continue;
1091 if (!prefixcmp(arg, "--timeout=")) {
1092 timeout = atoi(arg+10);
1093 continue;
1095 if (!prefixcmp(arg, "--init-timeout=")) {
1096 init_timeout = atoi(arg+15);
1097 continue;
1099 if (!prefixcmp(arg, "--max-connections=")) {
1100 max_connections = atoi(arg+18);
1101 if (max_connections < 0)
1102 max_connections = 0; /* unlimited */
1103 continue;
1105 if (!strcmp(arg, "--strict-paths")) {
1106 strict_paths = 1;
1107 continue;
1109 if (!prefixcmp(arg, "--base-path=")) {
1110 base_path = arg+12;
1111 continue;
1113 if (!strcmp(arg, "--base-path-relaxed")) {
1114 base_path_relaxed = 1;
1115 continue;
1117 if (!prefixcmp(arg, "--interpolated-path=")) {
1118 interpolated_path = arg+20;
1119 continue;
1121 if (!strcmp(arg, "--reuseaddr")) {
1122 reuseaddr = 1;
1123 continue;
1125 if (!strcmp(arg, "--user-path")) {
1126 user_path = "";
1127 continue;
1129 if (!prefixcmp(arg, "--user-path=")) {
1130 user_path = arg + 12;
1131 continue;
1133 if (!prefixcmp(arg, "--pid-file=")) {
1134 pid_file = arg + 11;
1135 continue;
1137 if (!strcmp(arg, "--detach")) {
1138 detach = 1;
1139 log_syslog = 1;
1140 continue;
1142 if (!prefixcmp(arg, "--user=")) {
1143 user_name = arg + 7;
1144 continue;
1146 if (!prefixcmp(arg, "--group=")) {
1147 group_name = arg + 8;
1148 continue;
1150 if (!prefixcmp(arg, "--enable=")) {
1151 enable_service(arg + 9, 1);
1152 continue;
1154 if (!prefixcmp(arg, "--disable=")) {
1155 enable_service(arg + 10, 0);
1156 continue;
1158 if (!prefixcmp(arg, "--allow-override=")) {
1159 make_service_overridable(arg + 17, 1);
1160 continue;
1162 if (!prefixcmp(arg, "--forbid-override=")) {
1163 make_service_overridable(arg + 18, 0);
1164 continue;
1166 if (!strcmp(arg, "--")) {
1167 ok_paths = &argv[i+1];
1168 break;
1169 } else if (arg[0] != '-') {
1170 ok_paths = &argv[i];
1171 break;
1174 usage(daemon_usage);
1177 if (log_syslog) {
1178 openlog("git-daemon", LOG_PID, LOG_DAEMON);
1179 set_die_routine(daemon_die);
1180 } else
1181 /* avoid splitting a message in the middle */
1182 setvbuf(stderr, NULL, _IOFBF, 4096);
1184 if (inetd_mode && (detach || group_name || user_name))
1185 die("--detach, --user and --group are incompatible with --inetd");
1187 if (inetd_mode && (listen_port || (listen_addr.nr > 0)))
1188 die("--listen= and --port= are incompatible with --inetd");
1189 else if (listen_port == 0)
1190 listen_port = DEFAULT_GIT_PORT;
1192 if (group_name && !user_name)
1193 die("--group supplied without --user");
1195 if (user_name)
1196 cred = prepare_credentials(user_name, group_name);
1198 if (strict_paths && (!ok_paths || !*ok_paths))
1199 die("option --strict-paths requires a whitelist");
1201 if (base_path && !is_directory(base_path))
1202 die("base-path '%s' does not exist or is not a directory",
1203 base_path);
1205 if (inetd_mode) {
1206 if (!freopen("/dev/null", "w", stderr))
1207 die_errno("failed to redirect stderr to /dev/null");
1210 if (inetd_mode || serve_mode)
1211 return execute();
1213 if (detach) {
1214 daemonize();
1215 loginfo("Ready to rumble");
1217 else
1218 sanitize_stdfds();
1220 if (pid_file)
1221 store_pid(pid_file);
1223 /* prepare argv for serving-processes */
1224 cld_argv = xmalloc(sizeof (char *) * (argc + 2));
1225 for (i = 0; i < argc; ++i)
1226 cld_argv[i] = argv[i];
1227 cld_argv[argc] = "--serve";
1228 cld_argv[argc+1] = NULL;
1230 return serve(&listen_addr, listen_port, cred);