Revert "compat: add strtok_r()"
[git/mingw.git] / daemon.c
blob4602b46a5c39e1d501143ab4e95b55aff5c8f23b
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 #ifdef NO_INITGROUPS
17 #define initgroups(x, y) (0) /* nothing */
18 #endif
20 static int log_syslog;
21 static int verbose;
22 static int reuseaddr;
23 static int informative_errors;
25 static const char daemon_usage[] =
26 "git daemon [--verbose] [--syslog] [--export-all]\n"
27 " [--timeout=<n>] [--init-timeout=<n>] [--max-connections=<n>]\n"
28 " [--strict-paths] [--base-path=<path>] [--base-path-relaxed]\n"
29 " [--user-path | --user-path=<path>]\n"
30 " [--interpolated-path=<path>]\n"
31 " [--reuseaddr] [--pid-file=<file>]\n"
32 " [--(enable|disable|allow-override|forbid-override)=<service>]\n"
33 " [--access-hook=<path>]\n"
34 " [--inetd | [--listen=<host_or_ipaddr>] [--port=<n>]\n"
35 " [--detach] [--user=<user> [--group=<group>]]\n"
36 " [<directory>...]";
38 /* List of acceptable pathname prefixes */
39 static char **ok_paths;
40 static int strict_paths;
42 /* If this is set, git-daemon-export-ok is not required */
43 static int export_all_trees;
45 /* Take all paths relative to this one if non-NULL */
46 static char *base_path;
47 static char *interpolated_path;
48 static int base_path_relaxed;
50 /* Flag indicating client sent extra args. */
51 static int saw_extended_args;
53 /* If defined, ~user notation is allowed and the string is inserted
54 * after ~user/. E.g. a request to git://host/~alice/frotz would
55 * go to /home/alice/pub_git/frotz with --user-path=pub_git.
57 static const char *user_path;
59 /* Timeout, and initial timeout */
60 static unsigned int timeout;
61 static unsigned int init_timeout;
63 static char *hostname;
64 static char *canon_hostname;
65 static char *ip_address;
66 static char *tcp_port;
68 static void logreport(int priority, const char *err, va_list params)
70 if (log_syslog) {
71 char buf[1024];
72 vsnprintf(buf, sizeof(buf), err, params);
73 syslog(priority, "%s", buf);
74 } else {
76 * Since stderr is set to buffered mode, the
77 * logging of different processes will not overlap
78 * unless they overflow the (rather big) buffers.
80 fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid());
81 vfprintf(stderr, err, params);
82 fputc('\n', stderr);
83 fflush(stderr);
87 __attribute__((format (printf, 1, 2)))
88 static void logerror(const char *err, ...)
90 va_list params;
91 va_start(params, err);
92 logreport(LOG_ERR, err, params);
93 va_end(params);
96 __attribute__((format (printf, 1, 2)))
97 static void loginfo(const char *err, ...)
99 va_list params;
100 if (!verbose)
101 return;
102 va_start(params, err);
103 logreport(LOG_INFO, err, params);
104 va_end(params);
107 static void NORETURN daemon_die(const char *err, va_list params)
109 logreport(LOG_ERR, err, params);
110 exit(1);
113 static const char *path_ok(char *directory)
115 static char rpath[PATH_MAX];
116 static char interp_path[PATH_MAX];
117 const char *path;
118 char *dir;
120 dir = directory;
122 if (daemon_avoid_alias(dir)) {
123 logerror("'%s': aliased", dir);
124 return NULL;
127 if (*dir == '~') {
128 if (!user_path) {
129 logerror("'%s': User-path not allowed", dir);
130 return NULL;
132 if (*user_path) {
133 /* Got either "~alice" or "~alice/foo";
134 * rewrite them to "~alice/%s" or
135 * "~alice/%s/foo".
137 int namlen, restlen = strlen(dir);
138 char *slash = strchr(dir, '/');
139 if (!slash)
140 slash = dir + restlen;
141 namlen = slash - dir;
142 restlen -= namlen;
143 loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
144 snprintf(rpath, PATH_MAX, "%.*s/%s%.*s",
145 namlen, dir, user_path, restlen, slash);
146 dir = rpath;
149 else if (interpolated_path && saw_extended_args) {
150 struct strbuf expanded_path = STRBUF_INIT;
151 struct strbuf_expand_dict_entry dict[6];
153 dict[0].placeholder = "H"; dict[0].value = hostname;
154 dict[1].placeholder = "CH"; dict[1].value = canon_hostname;
155 dict[2].placeholder = "IP"; dict[2].value = ip_address;
156 dict[3].placeholder = "P"; dict[3].value = tcp_port;
157 dict[4].placeholder = "D"; dict[4].value = directory;
158 dict[5].placeholder = NULL; dict[5].value = NULL;
159 if (*dir != '/') {
160 /* Allow only absolute */
161 logerror("'%s': Non-absolute path denied (interpolated-path active)", dir);
162 return NULL;
165 strbuf_expand(&expanded_path, interpolated_path,
166 strbuf_expand_dict_cb, &dict);
167 strlcpy(interp_path, expanded_path.buf, PATH_MAX);
168 strbuf_release(&expanded_path);
169 loginfo("Interpolated dir '%s'", interp_path);
171 dir = interp_path;
173 else if (base_path) {
174 if (*dir != '/') {
175 /* Allow only absolute */
176 logerror("'%s': Non-absolute path denied (base-path active)", dir);
177 return NULL;
179 snprintf(rpath, PATH_MAX, "%s%s", base_path, dir);
180 dir = rpath;
183 path = enter_repo(dir, strict_paths);
184 if (!path && base_path && base_path_relaxed) {
186 * if we fail and base_path_relaxed is enabled, try without
187 * prefixing the base path
189 dir = directory;
190 path = enter_repo(dir, strict_paths);
193 if (!path) {
194 logerror("'%s' does not appear to be a git repository", dir);
195 return NULL;
198 if ( ok_paths && *ok_paths ) {
199 char **pp;
200 int pathlen = strlen(path);
202 /* The validation is done on the paths after enter_repo
203 * appends optional {.git,.git/.git} and friends, but
204 * it does not use getcwd(). So if your /pub is
205 * a symlink to /mnt/pub, you can whitelist /pub and
206 * do not have to say /mnt/pub.
207 * Do not say /pub/.
209 for ( pp = ok_paths ; *pp ; pp++ ) {
210 int len = strlen(*pp);
211 if (len <= pathlen &&
212 !memcmp(*pp, path, len) &&
213 (path[len] == '\0' ||
214 (!strict_paths && path[len] == '/')))
215 return path;
218 else {
219 /* be backwards compatible */
220 if (!strict_paths)
221 return path;
224 logerror("'%s': not in whitelist", path);
225 return NULL; /* Fallthrough. Deny by default */
228 typedef int (*daemon_service_fn)(void);
229 struct daemon_service {
230 const char *name;
231 const char *config_name;
232 daemon_service_fn fn;
233 int enabled;
234 int overridable;
237 static struct daemon_service *service_looking_at;
238 static int service_enabled;
240 static int git_daemon_config(const char *var, const char *value, void *cb)
242 if (!prefixcmp(var, "daemon.") &&
243 !strcmp(var + 7, service_looking_at->config_name)) {
244 service_enabled = git_config_bool(var, value);
245 return 0;
248 /* we are not interested in parsing any other configuration here */
249 return 0;
252 static int daemon_error(const char *dir, const char *msg)
254 if (!informative_errors)
255 msg = "access denied or repository not exported";
256 packet_write(1, "ERR %s: %s", msg, dir);
257 return -1;
260 static char *access_hook;
262 static int run_access_hook(struct daemon_service *service, const char *dir, const char *path)
264 struct child_process child;
265 struct strbuf buf = STRBUF_INIT;
266 const char *argv[8];
267 const char **arg = argv;
268 char *eol;
269 int seen_errors = 0;
271 #define STRARG(x) ((x) ? (x) : "")
272 *arg++ = access_hook;
273 *arg++ = service->name;
274 *arg++ = path;
275 *arg++ = STRARG(hostname);
276 *arg++ = STRARG(canon_hostname);
277 *arg++ = STRARG(ip_address);
278 *arg++ = STRARG(tcp_port);
279 *arg = NULL;
280 #undef STRARG
282 memset(&child, 0, sizeof(child));
283 child.use_shell = 1;
284 child.argv = argv;
285 child.no_stdin = 1;
286 child.no_stderr = 1;
287 child.out = -1;
288 if (start_command(&child)) {
289 logerror("daemon access hook '%s' failed to start",
290 access_hook);
291 goto error_return;
293 if (strbuf_read(&buf, child.out, 0) < 0) {
294 logerror("failed to read from pipe to daemon access hook '%s'",
295 access_hook);
296 strbuf_reset(&buf);
297 seen_errors = 1;
299 if (close(child.out) < 0) {
300 logerror("failed to close pipe to daemon access hook '%s'",
301 access_hook);
302 seen_errors = 1;
304 if (finish_command(&child))
305 seen_errors = 1;
307 if (!seen_errors) {
308 strbuf_release(&buf);
309 return 0;
312 error_return:
313 strbuf_ltrim(&buf);
314 if (!buf.len)
315 strbuf_addstr(&buf, "service rejected");
316 eol = strchr(buf.buf, '\n');
317 if (eol)
318 *eol = '\0';
319 errno = EACCES;
320 daemon_error(dir, buf.buf);
321 strbuf_release(&buf);
322 return -1;
325 static int run_service(char *dir, struct daemon_service *service)
327 const char *path;
328 int enabled = service->enabled;
330 loginfo("Request %s for '%s'", service->name, dir);
332 if (!enabled && !service->overridable) {
333 logerror("'%s': service not enabled.", service->name);
334 errno = EACCES;
335 return daemon_error(dir, "service not enabled");
338 if (!(path = path_ok(dir)))
339 return daemon_error(dir, "no such repository");
342 * Security on the cheap.
344 * We want a readable HEAD, usable "objects" directory, and
345 * a "git-daemon-export-ok" flag that says that the other side
346 * is ok with us doing this.
348 * path_ok() uses enter_repo() and does whitelist checking.
349 * We only need to make sure the repository is exported.
352 if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
353 logerror("'%s': repository not exported.", path);
354 errno = EACCES;
355 return daemon_error(dir, "repository not exported");
358 if (service->overridable) {
359 service_looking_at = service;
360 service_enabled = -1;
361 git_config(git_daemon_config, NULL);
362 if (0 <= service_enabled)
363 enabled = service_enabled;
365 if (!enabled) {
366 logerror("'%s': service not enabled for '%s'",
367 service->name, path);
368 errno = EACCES;
369 return daemon_error(dir, "service not enabled");
373 * Optionally, a hook can choose to deny access to the
374 * repository depending on the phase of the moon.
376 if (access_hook && run_access_hook(service, dir, path))
377 return -1;
380 * We'll ignore SIGTERM from now on, we have a
381 * good client.
383 signal(SIGTERM, SIG_IGN);
385 return service->fn();
388 static void copy_to_log(int fd)
390 struct strbuf line = STRBUF_INIT;
391 FILE *fp;
393 fp = fdopen(fd, "r");
394 if (fp == NULL) {
395 logerror("fdopen of error channel failed");
396 close(fd);
397 return;
400 while (strbuf_getline(&line, fp, '\n') != EOF) {
401 logerror("%s", line.buf);
402 strbuf_setlen(&line, 0);
405 strbuf_release(&line);
406 fclose(fp);
409 static int run_service_command(const char **argv)
411 struct child_process cld;
413 memset(&cld, 0, sizeof(cld));
414 cld.argv = argv;
415 cld.git_cmd = 1;
416 cld.err = -1;
417 if (start_command(&cld))
418 return -1;
420 close(0);
421 close(1);
423 copy_to_log(cld.err);
425 return finish_command(&cld);
428 static int upload_pack(void)
430 /* Timeout as string */
431 char timeout_buf[64];
432 const char *argv[] = { "upload-pack", "--strict", NULL, ".", NULL };
434 argv[2] = timeout_buf;
436 snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout);
437 return run_service_command(argv);
440 static int upload_archive(void)
442 static const char *argv[] = { "upload-archive", ".", NULL };
443 return run_service_command(argv);
446 static int receive_pack(void)
448 static const char *argv[] = { "receive-pack", ".", NULL };
449 return run_service_command(argv);
452 static struct daemon_service daemon_service[] = {
453 { "upload-archive", "uploadarch", upload_archive, 0, 1 },
454 { "upload-pack", "uploadpack", upload_pack, 1, 1 },
455 { "receive-pack", "receivepack", receive_pack, 0, 1 },
458 static void enable_service(const char *name, int ena)
460 int i;
461 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
462 if (!strcmp(daemon_service[i].name, name)) {
463 daemon_service[i].enabled = ena;
464 return;
467 die("No such service %s", name);
470 static void make_service_overridable(const char *name, int ena)
472 int i;
473 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
474 if (!strcmp(daemon_service[i].name, name)) {
475 daemon_service[i].overridable = ena;
476 return;
479 die("No such service %s", name);
482 static char *xstrdup_tolower(const char *str)
484 char *p, *dup = xstrdup(str);
485 for (p = dup; *p; p++)
486 *p = tolower(*p);
487 return dup;
490 static void parse_host_and_port(char *hostport, char **host,
491 char **port)
493 if (*hostport == '[') {
494 char *end;
496 end = strchr(hostport, ']');
497 if (!end)
498 die("Invalid request ('[' without ']')");
499 *end = '\0';
500 *host = hostport + 1;
501 if (!end[1])
502 *port = NULL;
503 else if (end[1] == ':')
504 *port = end + 2;
505 else
506 die("Garbage after end of host part");
507 } else {
508 *host = hostport;
509 *port = strrchr(hostport, ':');
510 if (*port) {
511 **port = '\0';
512 ++*port;
518 * Read the host as supplied by the client connection.
520 static void parse_host_arg(char *extra_args, int buflen)
522 char *val;
523 int vallen;
524 char *end = extra_args + buflen;
526 if (extra_args < end && *extra_args) {
527 saw_extended_args = 1;
528 if (strncasecmp("host=", extra_args, 5) == 0) {
529 val = extra_args + 5;
530 vallen = strlen(val) + 1;
531 if (*val) {
532 /* Split <host>:<port> at colon. */
533 char *host;
534 char *port;
535 parse_host_and_port(val, &host, &port);
536 if (port) {
537 free(tcp_port);
538 tcp_port = xstrdup(port);
540 free(hostname);
541 hostname = xstrdup_tolower(host);
544 /* On to the next one */
545 extra_args = val + vallen;
547 if (extra_args < end && *extra_args)
548 die("Invalid request");
552 * Locate canonical hostname and its IP address.
554 if (hostname) {
555 #ifndef NO_IPV6
556 struct addrinfo hints;
557 struct addrinfo *ai;
558 int gai;
559 static char addrbuf[HOST_NAME_MAX + 1];
561 memset(&hints, 0, sizeof(hints));
562 hints.ai_flags = AI_CANONNAME;
564 gai = getaddrinfo(hostname, NULL, &hints, &ai);
565 if (!gai) {
566 struct sockaddr_in *sin_addr = (void *)ai->ai_addr;
568 inet_ntop(AF_INET, &sin_addr->sin_addr,
569 addrbuf, sizeof(addrbuf));
570 free(ip_address);
571 ip_address = xstrdup(addrbuf);
573 free(canon_hostname);
574 canon_hostname = xstrdup(ai->ai_canonname ?
575 ai->ai_canonname : ip_address);
577 freeaddrinfo(ai);
579 #else
580 struct hostent *hent;
581 struct sockaddr_in sa;
582 char **ap;
583 static char addrbuf[HOST_NAME_MAX + 1];
585 hent = gethostbyname(hostname);
587 ap = hent->h_addr_list;
588 memset(&sa, 0, sizeof sa);
589 sa.sin_family = hent->h_addrtype;
590 sa.sin_port = htons(0);
591 memcpy(&sa.sin_addr, *ap, hent->h_length);
593 inet_ntop(hent->h_addrtype, &sa.sin_addr,
594 addrbuf, sizeof(addrbuf));
596 free(canon_hostname);
597 canon_hostname = xstrdup(hent->h_name);
598 free(ip_address);
599 ip_address = xstrdup(addrbuf);
600 #endif
605 static int execute(void)
607 static char line[1000];
608 int pktlen, len, i;
609 char *addr = getenv("REMOTE_ADDR"), *port = getenv("REMOTE_PORT");
611 if (addr)
612 loginfo("Connection from %s:%s", addr, port);
614 alarm(init_timeout ? init_timeout : timeout);
615 pktlen = packet_read_line(0, line, sizeof(line));
616 alarm(0);
618 len = strlen(line);
619 if (pktlen != len)
620 loginfo("Extended attributes (%d bytes) exist <%.*s>",
621 (int) pktlen - len,
622 (int) pktlen - len, line + len + 1);
623 if (len && line[len-1] == '\n') {
624 line[--len] = 0;
625 pktlen--;
628 free(hostname);
629 free(canon_hostname);
630 free(ip_address);
631 free(tcp_port);
632 hostname = canon_hostname = ip_address = tcp_port = NULL;
634 if (len != pktlen)
635 parse_host_arg(line + len + 1, pktlen - len - 1);
637 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
638 struct daemon_service *s = &(daemon_service[i]);
639 int namelen = strlen(s->name);
640 if (!prefixcmp(line, "git-") &&
641 !strncmp(s->name, line + 4, namelen) &&
642 line[namelen + 4] == ' ') {
644 * Note: The directory here is probably context sensitive,
645 * and might depend on the actual service being performed.
647 return run_service(line + namelen + 5, s);
651 logerror("Protocol error: '%s'", line);
652 return -1;
655 static int addrcmp(const struct sockaddr_storage *s1,
656 const struct sockaddr_storage *s2)
658 const struct sockaddr *sa1 = (const struct sockaddr*) s1;
659 const struct sockaddr *sa2 = (const struct sockaddr*) s2;
661 if (sa1->sa_family != sa2->sa_family)
662 return sa1->sa_family - sa2->sa_family;
663 if (sa1->sa_family == AF_INET)
664 return memcmp(&((struct sockaddr_in *)s1)->sin_addr,
665 &((struct sockaddr_in *)s2)->sin_addr,
666 sizeof(struct in_addr));
667 #ifndef NO_IPV6
668 if (sa1->sa_family == AF_INET6)
669 return memcmp(&((struct sockaddr_in6 *)s1)->sin6_addr,
670 &((struct sockaddr_in6 *)s2)->sin6_addr,
671 sizeof(struct in6_addr));
672 #endif
673 return 0;
676 static int max_connections = 32;
678 static unsigned int live_children;
680 static struct child {
681 struct child *next;
682 struct child_process cld;
683 struct sockaddr_storage address;
684 } *firstborn;
686 static void add_child(struct child_process *cld, struct sockaddr *addr, socklen_t addrlen)
688 struct child *newborn, **cradle;
690 newborn = xcalloc(1, sizeof(*newborn));
691 live_children++;
692 memcpy(&newborn->cld, cld, sizeof(*cld));
693 memcpy(&newborn->address, addr, addrlen);
694 for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next)
695 if (!addrcmp(&(*cradle)->address, &newborn->address))
696 break;
697 newborn->next = *cradle;
698 *cradle = newborn;
702 * This gets called if the number of connections grows
703 * past "max_connections".
705 * We kill the newest connection from a duplicate IP.
707 static void kill_some_child(void)
709 const struct child *blanket, *next;
711 if (!(blanket = firstborn))
712 return;
714 for (; (next = blanket->next); blanket = next)
715 if (!addrcmp(&blanket->address, &next->address)) {
716 kill(blanket->cld.pid, SIGTERM);
717 break;
721 static void check_dead_children(void)
723 int status;
724 pid_t pid;
726 struct child **cradle, *blanket;
727 for (cradle = &firstborn; (blanket = *cradle);)
728 if ((pid = waitpid(blanket->cld.pid, &status, WNOHANG)) > 1) {
729 const char *dead = "";
730 if (status)
731 dead = " (with error)";
732 loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead);
734 /* remove the child */
735 *cradle = blanket->next;
736 live_children--;
737 free(blanket);
738 } else
739 cradle = &blanket->next;
742 static char **cld_argv;
743 static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen)
745 struct child_process cld = { NULL };
746 char addrbuf[300] = "REMOTE_ADDR=", portbuf[300];
747 char *env[] = { addrbuf, portbuf, NULL };
749 if (max_connections && live_children >= max_connections) {
750 kill_some_child();
751 sleep(1); /* give it some time to die */
752 check_dead_children();
753 if (live_children >= max_connections) {
754 close(incoming);
755 logerror("Too many children, dropping connection");
756 return;
760 if (addr->sa_family == AF_INET) {
761 struct sockaddr_in *sin_addr = (void *) addr;
762 inet_ntop(addr->sa_family, &sin_addr->sin_addr, addrbuf + 12,
763 sizeof(addrbuf) - 12);
764 snprintf(portbuf, sizeof(portbuf), "REMOTE_PORT=%d",
765 ntohs(sin_addr->sin_port));
766 #ifndef NO_IPV6
767 } else if (addr && addr->sa_family == AF_INET6) {
768 struct sockaddr_in6 *sin6_addr = (void *) addr;
770 char *buf = addrbuf + 12;
771 *buf++ = '['; *buf = '\0'; /* stpcpy() is cool */
772 inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf,
773 sizeof(addrbuf) - 13);
774 strcat(buf, "]");
776 snprintf(portbuf, sizeof(portbuf), "REMOTE_PORT=%d",
777 ntohs(sin6_addr->sin6_port));
778 #endif
781 cld.env = (const char **)env;
782 cld.argv = (const char **)cld_argv;
783 cld.in = incoming;
784 cld.out = dup(incoming);
786 if (start_command(&cld))
787 logerror("unable to fork");
788 else
789 add_child(&cld, addr, addrlen);
790 close(incoming);
793 static void child_handler(int signo)
796 * Otherwise empty handler because systemcalls will get interrupted
797 * upon signal receipt
798 * SysV needs the handler to be rearmed
800 signal(SIGCHLD, child_handler);
803 static int set_reuse_addr(int sockfd)
805 int on = 1;
807 if (!reuseaddr)
808 return 0;
809 return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
810 &on, sizeof(on));
813 struct socketlist {
814 int *list;
815 size_t nr;
816 size_t alloc;
819 static const char *ip2str(int family, struct sockaddr *sin, socklen_t len)
821 #ifdef NO_IPV6
822 static char ip[INET_ADDRSTRLEN];
823 #else
824 static char ip[INET6_ADDRSTRLEN];
825 #endif
827 switch (family) {
828 #ifndef NO_IPV6
829 case AF_INET6:
830 inet_ntop(family, &((struct sockaddr_in6*)sin)->sin6_addr, ip, len);
831 break;
832 #endif
833 case AF_INET:
834 inet_ntop(family, &((struct sockaddr_in*)sin)->sin_addr, ip, len);
835 break;
836 default:
837 strcpy(ip, "<unknown>");
839 return ip;
842 #ifndef NO_IPV6
844 static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
846 int socknum = 0;
847 int maxfd = -1;
848 char pbuf[NI_MAXSERV];
849 struct addrinfo hints, *ai0, *ai;
850 int gai;
851 long flags;
853 sprintf(pbuf, "%d", listen_port);
854 memset(&hints, 0, sizeof(hints));
855 hints.ai_family = AF_UNSPEC;
856 hints.ai_socktype = SOCK_STREAM;
857 hints.ai_protocol = IPPROTO_TCP;
858 hints.ai_flags = AI_PASSIVE;
860 gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0);
861 if (gai) {
862 logerror("getaddrinfo() for %s failed: %s", listen_addr, gai_strerror(gai));
863 return 0;
866 for (ai = ai0; ai; ai = ai->ai_next) {
867 int sockfd;
869 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
870 if (sockfd < 0)
871 continue;
872 if (sockfd >= FD_SETSIZE) {
873 logerror("Socket descriptor too large");
874 close(sockfd);
875 continue;
878 #ifdef IPV6_V6ONLY
879 if (ai->ai_family == AF_INET6) {
880 int on = 1;
881 setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
882 &on, sizeof(on));
883 /* Note: error is not fatal */
885 #endif
887 if (set_reuse_addr(sockfd)) {
888 logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
889 close(sockfd);
890 continue;
893 if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
894 logerror("Could not bind to %s: %s",
895 ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
896 strerror(errno));
897 close(sockfd);
898 continue; /* not fatal */
900 if (listen(sockfd, 5) < 0) {
901 logerror("Could not listen to %s: %s",
902 ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
903 strerror(errno));
904 close(sockfd);
905 continue; /* not fatal */
908 flags = fcntl(sockfd, F_GETFD, 0);
909 if (flags >= 0)
910 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
912 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
913 socklist->list[socklist->nr++] = sockfd;
914 socknum++;
916 if (maxfd < sockfd)
917 maxfd = sockfd;
920 freeaddrinfo(ai0);
922 return socknum;
925 #else /* NO_IPV6 */
927 static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
929 struct sockaddr_in sin;
930 int sockfd;
931 long flags;
933 memset(&sin, 0, sizeof sin);
934 sin.sin_family = AF_INET;
935 sin.sin_port = htons(listen_port);
937 if (listen_addr) {
938 /* Well, host better be an IP address here. */
939 if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0)
940 return 0;
941 } else {
942 sin.sin_addr.s_addr = htonl(INADDR_ANY);
945 sockfd = socket(AF_INET, SOCK_STREAM, 0);
946 if (sockfd < 0)
947 return 0;
949 if (set_reuse_addr(sockfd)) {
950 logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
951 close(sockfd);
952 return 0;
955 if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
956 logerror("Could not listen to %s: %s",
957 ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
958 strerror(errno));
959 close(sockfd);
960 return 0;
963 if (listen(sockfd, 5) < 0) {
964 logerror("Could not listen to %s: %s",
965 ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
966 strerror(errno));
967 close(sockfd);
968 return 0;
971 flags = fcntl(sockfd, F_GETFD, 0);
972 if (flags >= 0)
973 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
975 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
976 socklist->list[socklist->nr++] = sockfd;
977 return 1;
980 #endif
982 static void socksetup(struct string_list *listen_addr, int listen_port, struct socketlist *socklist)
984 if (!listen_addr->nr)
985 setup_named_sock(NULL, listen_port, socklist);
986 else {
987 int i, socknum;
988 for (i = 0; i < listen_addr->nr; i++) {
989 socknum = setup_named_sock(listen_addr->items[i].string,
990 listen_port, socklist);
992 if (socknum == 0)
993 logerror("unable to allocate any listen sockets for host %s on port %u",
994 listen_addr->items[i].string, listen_port);
999 static int service_loop(struct socketlist *socklist)
1001 struct pollfd *pfd;
1002 int i;
1004 pfd = xcalloc(socklist->nr, sizeof(struct pollfd));
1006 for (i = 0; i < socklist->nr; i++) {
1007 pfd[i].fd = socklist->list[i];
1008 pfd[i].events = POLLIN;
1011 signal(SIGCHLD, child_handler);
1013 for (;;) {
1014 int i;
1016 check_dead_children();
1018 if (poll(pfd, socklist->nr, -1) < 0) {
1019 if (errno != EINTR) {
1020 logerror("Poll failed, resuming: %s",
1021 strerror(errno));
1022 sleep(1);
1024 continue;
1027 for (i = 0; i < socklist->nr; i++) {
1028 if (pfd[i].revents & POLLIN) {
1029 union {
1030 struct sockaddr sa;
1031 struct sockaddr_in sai;
1032 #ifndef NO_IPV6
1033 struct sockaddr_in6 sai6;
1034 #endif
1035 } ss;
1036 socklen_t sslen = sizeof(ss);
1037 int incoming = accept(pfd[i].fd, &ss.sa, &sslen);
1038 if (incoming < 0) {
1039 switch (errno) {
1040 case EAGAIN:
1041 case EINTR:
1042 case ECONNABORTED:
1043 continue;
1044 default:
1045 die_errno("accept returned");
1048 handle(incoming, &ss.sa, sslen);
1054 /* if any standard file descriptor is missing open it to /dev/null */
1055 static void sanitize_stdfds(void)
1057 int fd = open("/dev/null", O_RDWR, 0);
1058 while (fd != -1 && fd < 2)
1059 fd = dup(fd);
1060 if (fd == -1)
1061 die_errno("open /dev/null or dup failed");
1062 if (fd > 2)
1063 close(fd);
1066 #ifdef NO_POSIX_GOODIES
1068 struct credentials;
1070 static void drop_privileges(struct credentials *cred)
1072 /* nothing */
1075 static void daemonize(void)
1077 die("--detach not supported on this platform");
1080 static struct credentials *prepare_credentials(const char *user_name,
1081 const char *group_name)
1083 die("--user not supported on this platform");
1086 #else
1088 struct credentials {
1089 struct passwd *pass;
1090 gid_t gid;
1093 static void drop_privileges(struct credentials *cred)
1095 if (cred && (initgroups(cred->pass->pw_name, cred->gid) ||
1096 setgid (cred->gid) || setuid(cred->pass->pw_uid)))
1097 die("cannot drop privileges");
1100 static struct credentials *prepare_credentials(const char *user_name,
1101 const char *group_name)
1103 static struct credentials c;
1105 c.pass = getpwnam(user_name);
1106 if (!c.pass)
1107 die("user not found - %s", user_name);
1109 if (!group_name)
1110 c.gid = c.pass->pw_gid;
1111 else {
1112 struct group *group = getgrnam(group_name);
1113 if (!group)
1114 die("group not found - %s", group_name);
1116 c.gid = group->gr_gid;
1119 return &c;
1122 static void daemonize(void)
1124 switch (fork()) {
1125 case 0:
1126 break;
1127 case -1:
1128 die_errno("fork failed");
1129 default:
1130 exit(0);
1132 if (setsid() == -1)
1133 die_errno("setsid failed");
1134 close(0);
1135 close(1);
1136 close(2);
1137 sanitize_stdfds();
1139 #endif
1141 static void store_pid(const char *path)
1143 FILE *f = fopen(path, "w");
1144 if (!f)
1145 die_errno("cannot open pid file '%s'", path);
1146 if (fprintf(f, "%"PRIuMAX"\n", (uintmax_t) getpid()) < 0 || fclose(f) != 0)
1147 die_errno("failed to write pid file '%s'", path);
1150 static int serve(struct string_list *listen_addr, int listen_port,
1151 struct credentials *cred)
1153 struct socketlist socklist = { NULL, 0, 0 };
1155 socksetup(listen_addr, listen_port, &socklist);
1156 if (socklist.nr == 0)
1157 die("unable to allocate any listen sockets on port %u",
1158 listen_port);
1160 drop_privileges(cred);
1162 loginfo("Ready to rumble");
1164 return service_loop(&socklist);
1167 int main(int argc, char **argv)
1169 int listen_port = 0;
1170 struct string_list listen_addr = STRING_LIST_INIT_NODUP;
1171 int serve_mode = 0, inetd_mode = 0;
1172 const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
1173 int detach = 0;
1174 struct credentials *cred = NULL;
1175 int i;
1177 git_setup_gettext();
1179 git_extract_argv0_path(argv[0]);
1181 for (i = 1; i < argc; i++) {
1182 char *arg = argv[i];
1184 if (!prefixcmp(arg, "--listen=")) {
1185 string_list_append(&listen_addr, xstrdup_tolower(arg + 9));
1186 continue;
1188 if (!prefixcmp(arg, "--port=")) {
1189 char *end;
1190 unsigned long n;
1191 n = strtoul(arg+7, &end, 0);
1192 if (arg[7] && !*end) {
1193 listen_port = n;
1194 continue;
1197 if (!strcmp(arg, "--serve")) {
1198 serve_mode = 1;
1199 continue;
1201 if (!strcmp(arg, "--inetd")) {
1202 inetd_mode = 1;
1203 log_syslog = 1;
1204 continue;
1206 if (!strcmp(arg, "--verbose")) {
1207 verbose = 1;
1208 continue;
1210 if (!strcmp(arg, "--syslog")) {
1211 log_syslog = 1;
1212 continue;
1214 if (!strcmp(arg, "--export-all")) {
1215 export_all_trees = 1;
1216 continue;
1218 if (!prefixcmp(arg, "--access-hook=")) {
1219 access_hook = arg + 14;
1220 continue;
1222 if (!prefixcmp(arg, "--timeout=")) {
1223 timeout = atoi(arg+10);
1224 continue;
1226 if (!prefixcmp(arg, "--init-timeout=")) {
1227 init_timeout = atoi(arg+15);
1228 continue;
1230 if (!prefixcmp(arg, "--max-connections=")) {
1231 max_connections = atoi(arg+18);
1232 if (max_connections < 0)
1233 max_connections = 0; /* unlimited */
1234 continue;
1236 if (!strcmp(arg, "--strict-paths")) {
1237 strict_paths = 1;
1238 continue;
1240 if (!prefixcmp(arg, "--base-path=")) {
1241 base_path = arg+12;
1242 continue;
1244 if (!strcmp(arg, "--base-path-relaxed")) {
1245 base_path_relaxed = 1;
1246 continue;
1248 if (!prefixcmp(arg, "--interpolated-path=")) {
1249 interpolated_path = arg+20;
1250 continue;
1252 if (!strcmp(arg, "--reuseaddr")) {
1253 reuseaddr = 1;
1254 continue;
1256 if (!strcmp(arg, "--user-path")) {
1257 user_path = "";
1258 continue;
1260 if (!prefixcmp(arg, "--user-path=")) {
1261 user_path = arg + 12;
1262 continue;
1264 if (!prefixcmp(arg, "--pid-file=")) {
1265 pid_file = arg + 11;
1266 continue;
1268 if (!strcmp(arg, "--detach")) {
1269 detach = 1;
1270 log_syslog = 1;
1271 continue;
1273 if (!prefixcmp(arg, "--user=")) {
1274 user_name = arg + 7;
1275 continue;
1277 if (!prefixcmp(arg, "--group=")) {
1278 group_name = arg + 8;
1279 continue;
1281 if (!prefixcmp(arg, "--enable=")) {
1282 enable_service(arg + 9, 1);
1283 continue;
1285 if (!prefixcmp(arg, "--disable=")) {
1286 enable_service(arg + 10, 0);
1287 continue;
1289 if (!prefixcmp(arg, "--allow-override=")) {
1290 make_service_overridable(arg + 17, 1);
1291 continue;
1293 if (!prefixcmp(arg, "--forbid-override=")) {
1294 make_service_overridable(arg + 18, 0);
1295 continue;
1297 if (!prefixcmp(arg, "--informative-errors")) {
1298 informative_errors = 1;
1299 continue;
1301 if (!prefixcmp(arg, "--no-informative-errors")) {
1302 informative_errors = 0;
1303 continue;
1305 if (!strcmp(arg, "--")) {
1306 ok_paths = &argv[i+1];
1307 break;
1308 } else if (arg[0] != '-') {
1309 ok_paths = &argv[i];
1310 break;
1313 usage(daemon_usage);
1316 if (log_syslog) {
1317 openlog("git-daemon", LOG_PID, LOG_DAEMON);
1318 set_die_routine(daemon_die);
1319 } else
1320 /* avoid splitting a message in the middle */
1321 setvbuf(stderr, NULL, _IOFBF, 4096);
1323 if (inetd_mode && (detach || group_name || user_name))
1324 die("--detach, --user and --group are incompatible with --inetd");
1326 if (inetd_mode && (listen_port || (listen_addr.nr > 0)))
1327 die("--listen= and --port= are incompatible with --inetd");
1328 else if (listen_port == 0)
1329 listen_port = DEFAULT_GIT_PORT;
1331 if (group_name && !user_name)
1332 die("--group supplied without --user");
1334 if (user_name)
1335 cred = prepare_credentials(user_name, group_name);
1337 if (strict_paths && (!ok_paths || !*ok_paths))
1338 die("option --strict-paths requires a whitelist");
1340 if (base_path && !is_directory(base_path))
1341 die("base-path '%s' does not exist or is not a directory",
1342 base_path);
1344 if (inetd_mode) {
1345 if (!freopen("/dev/null", "w", stderr))
1346 die_errno("failed to redirect stderr to /dev/null");
1349 if (inetd_mode || serve_mode)
1350 return execute();
1352 if (detach)
1353 daemonize();
1354 else
1355 sanitize_stdfds();
1357 if (pid_file)
1358 store_pid(pid_file);
1360 /* prepare argv for serving-processes */
1361 cld_argv = xmalloc(sizeof (char *) * (argc + 2));
1362 cld_argv[0] = argv[0]; /* git-daemon */
1363 cld_argv[1] = "--serve";
1364 for (i = 1; i < argc; ++i)
1365 cld_argv[i+1] = argv[i];
1366 cld_argv[argc+1] = NULL;
1368 return serve(&listen_addr, listen_port, cred);