stash: teach 'push' (and 'create_stash') to honor pathspec
[git.git] / daemon.c
blob473e6b6b63c42e59d5a89985b2573ab5c2815157
1 #include "cache.h"
2 #include "pkt-line.h"
3 #include "run-command.h"
4 #include "strbuf.h"
5 #include "string-list.h"
7 #ifndef HOST_NAME_MAX
8 #define HOST_NAME_MAX 256
9 #endif
11 #ifdef NO_INITGROUPS
12 #define initgroups(x, y) (0) /* nothing */
13 #endif
15 static int log_syslog;
16 static int verbose;
17 static int reuseaddr;
18 static int informative_errors;
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 " [--access-hook=<path>]\n"
29 " [--inetd | [--listen=<host_or_ipaddr>] [--port=<n>]\n"
30 " [--detach] [--user=<user> [--group=<group>]]\n"
31 " [<directory>...]";
33 /* List of acceptable pathname prefixes */
34 static const 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 const char *base_path;
42 static const char *interpolated_path;
43 static int base_path_relaxed;
45 /* If defined, ~user notation is allowed and the string is inserted
46 * after ~user/. E.g. a request to git://host/~alice/frotz would
47 * go to /home/alice/pub_git/frotz with --user-path=pub_git.
49 static const char *user_path;
51 /* Timeout, and initial timeout */
52 static unsigned int timeout;
53 static unsigned int init_timeout;
55 struct hostinfo {
56 struct strbuf hostname;
57 struct strbuf canon_hostname;
58 struct strbuf ip_address;
59 struct strbuf tcp_port;
60 unsigned int hostname_lookup_done:1;
61 unsigned int saw_extended_args:1;
64 static void lookup_hostname(struct hostinfo *hi);
66 static const char *get_canon_hostname(struct hostinfo *hi)
68 lookup_hostname(hi);
69 return hi->canon_hostname.buf;
72 static const char *get_ip_address(struct hostinfo *hi)
74 lookup_hostname(hi);
75 return hi->ip_address.buf;
78 static void logreport(int priority, const char *err, va_list params)
80 if (log_syslog) {
81 char buf[1024];
82 vsnprintf(buf, sizeof(buf), err, params);
83 syslog(priority, "%s", buf);
84 } else {
86 * Since stderr is set to buffered mode, the
87 * logging of different processes will not overlap
88 * unless they overflow the (rather big) buffers.
90 fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid());
91 vfprintf(stderr, err, params);
92 fputc('\n', stderr);
93 fflush(stderr);
97 __attribute__((format (printf, 1, 2)))
98 static void logerror(const char *err, ...)
100 va_list params;
101 va_start(params, err);
102 logreport(LOG_ERR, err, params);
103 va_end(params);
106 __attribute__((format (printf, 1, 2)))
107 static void loginfo(const char *err, ...)
109 va_list params;
110 if (!verbose)
111 return;
112 va_start(params, err);
113 logreport(LOG_INFO, err, params);
114 va_end(params);
117 static void NORETURN daemon_die(const char *err, va_list params)
119 logreport(LOG_ERR, err, params);
120 exit(1);
123 struct expand_path_context {
124 const char *directory;
125 struct hostinfo *hostinfo;
128 static size_t expand_path(struct strbuf *sb, const char *placeholder, void *ctx)
130 struct expand_path_context *context = ctx;
131 struct hostinfo *hi = context->hostinfo;
133 switch (placeholder[0]) {
134 case 'H':
135 strbuf_addbuf(sb, &hi->hostname);
136 return 1;
137 case 'C':
138 if (placeholder[1] == 'H') {
139 strbuf_addstr(sb, get_canon_hostname(hi));
140 return 2;
142 break;
143 case 'I':
144 if (placeholder[1] == 'P') {
145 strbuf_addstr(sb, get_ip_address(hi));
146 return 2;
148 break;
149 case 'P':
150 strbuf_addbuf(sb, &hi->tcp_port);
151 return 1;
152 case 'D':
153 strbuf_addstr(sb, context->directory);
154 return 1;
156 return 0;
159 static const char *path_ok(const char *directory, struct hostinfo *hi)
161 static char rpath[PATH_MAX];
162 static char interp_path[PATH_MAX];
163 size_t rlen;
164 const char *path;
165 const char *dir;
167 dir = directory;
169 if (daemon_avoid_alias(dir)) {
170 logerror("'%s': aliased", dir);
171 return NULL;
174 if (*dir == '~') {
175 if (!user_path) {
176 logerror("'%s': User-path not allowed", dir);
177 return NULL;
179 if (*user_path) {
180 /* Got either "~alice" or "~alice/foo";
181 * rewrite them to "~alice/%s" or
182 * "~alice/%s/foo".
184 int namlen, restlen = strlen(dir);
185 const char *slash = strchr(dir, '/');
186 if (!slash)
187 slash = dir + restlen;
188 namlen = slash - dir;
189 restlen -= namlen;
190 loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
191 rlen = snprintf(rpath, sizeof(rpath), "%.*s/%s%.*s",
192 namlen, dir, user_path, restlen, slash);
193 if (rlen >= sizeof(rpath)) {
194 logerror("user-path too large: %s", rpath);
195 return NULL;
197 dir = rpath;
200 else if (interpolated_path && hi->saw_extended_args) {
201 struct strbuf expanded_path = STRBUF_INIT;
202 struct expand_path_context context;
204 context.directory = directory;
205 context.hostinfo = hi;
207 if (*dir != '/') {
208 /* Allow only absolute */
209 logerror("'%s': Non-absolute path denied (interpolated-path active)", dir);
210 return NULL;
213 strbuf_expand(&expanded_path, interpolated_path,
214 expand_path, &context);
216 rlen = strlcpy(interp_path, expanded_path.buf,
217 sizeof(interp_path));
218 if (rlen >= sizeof(interp_path)) {
219 logerror("interpolated path too large: %s",
220 interp_path);
221 return NULL;
224 strbuf_release(&expanded_path);
225 loginfo("Interpolated dir '%s'", interp_path);
227 dir = interp_path;
229 else if (base_path) {
230 if (*dir != '/') {
231 /* Allow only absolute */
232 logerror("'%s': Non-absolute path denied (base-path active)", dir);
233 return NULL;
235 rlen = snprintf(rpath, sizeof(rpath), "%s%s", base_path, dir);
236 if (rlen >= sizeof(rpath)) {
237 logerror("base-path too large: %s", rpath);
238 return NULL;
240 dir = rpath;
243 path = enter_repo(dir, strict_paths);
244 if (!path && base_path && base_path_relaxed) {
246 * if we fail and base_path_relaxed is enabled, try without
247 * prefixing the base path
249 dir = directory;
250 path = enter_repo(dir, strict_paths);
253 if (!path) {
254 logerror("'%s' does not appear to be a git repository", dir);
255 return NULL;
258 if ( ok_paths && *ok_paths ) {
259 const char **pp;
260 int pathlen = strlen(path);
262 /* The validation is done on the paths after enter_repo
263 * appends optional {.git,.git/.git} and friends, but
264 * it does not use getcwd(). So if your /pub is
265 * a symlink to /mnt/pub, you can whitelist /pub and
266 * do not have to say /mnt/pub.
267 * Do not say /pub/.
269 for ( pp = ok_paths ; *pp ; pp++ ) {
270 int len = strlen(*pp);
271 if (len <= pathlen &&
272 !memcmp(*pp, path, len) &&
273 (path[len] == '\0' ||
274 (!strict_paths && path[len] == '/')))
275 return path;
278 else {
279 /* be backwards compatible */
280 if (!strict_paths)
281 return path;
284 logerror("'%s': not in whitelist", path);
285 return NULL; /* Fallthrough. Deny by default */
288 typedef int (*daemon_service_fn)(void);
289 struct daemon_service {
290 const char *name;
291 const char *config_name;
292 daemon_service_fn fn;
293 int enabled;
294 int overridable;
297 static int daemon_error(const char *dir, const char *msg)
299 if (!informative_errors)
300 msg = "access denied or repository not exported";
301 packet_write_fmt(1, "ERR %s: %s", msg, dir);
302 return -1;
305 static const char *access_hook;
307 static int run_access_hook(struct daemon_service *service, const char *dir,
308 const char *path, struct hostinfo *hi)
310 struct child_process child = CHILD_PROCESS_INIT;
311 struct strbuf buf = STRBUF_INIT;
312 const char *argv[8];
313 const char **arg = argv;
314 char *eol;
315 int seen_errors = 0;
317 *arg++ = access_hook;
318 *arg++ = service->name;
319 *arg++ = path;
320 *arg++ = hi->hostname.buf;
321 *arg++ = get_canon_hostname(hi);
322 *arg++ = get_ip_address(hi);
323 *arg++ = hi->tcp_port.buf;
324 *arg = NULL;
326 child.use_shell = 1;
327 child.argv = argv;
328 child.no_stdin = 1;
329 child.no_stderr = 1;
330 child.out = -1;
331 if (start_command(&child)) {
332 logerror("daemon access hook '%s' failed to start",
333 access_hook);
334 goto error_return;
336 if (strbuf_read(&buf, child.out, 0) < 0) {
337 logerror("failed to read from pipe to daemon access hook '%s'",
338 access_hook);
339 strbuf_reset(&buf);
340 seen_errors = 1;
342 if (close(child.out) < 0) {
343 logerror("failed to close pipe to daemon access hook '%s'",
344 access_hook);
345 seen_errors = 1;
347 if (finish_command(&child))
348 seen_errors = 1;
350 if (!seen_errors) {
351 strbuf_release(&buf);
352 return 0;
355 error_return:
356 strbuf_ltrim(&buf);
357 if (!buf.len)
358 strbuf_addstr(&buf, "service rejected");
359 eol = strchr(buf.buf, '\n');
360 if (eol)
361 *eol = '\0';
362 errno = EACCES;
363 daemon_error(dir, buf.buf);
364 strbuf_release(&buf);
365 return -1;
368 static int run_service(const char *dir, struct daemon_service *service,
369 struct hostinfo *hi)
371 const char *path;
372 int enabled = service->enabled;
373 struct strbuf var = STRBUF_INIT;
375 loginfo("Request %s for '%s'", service->name, dir);
377 if (!enabled && !service->overridable) {
378 logerror("'%s': service not enabled.", service->name);
379 errno = EACCES;
380 return daemon_error(dir, "service not enabled");
383 if (!(path = path_ok(dir, hi)))
384 return daemon_error(dir, "no such repository");
387 * Security on the cheap.
389 * We want a readable HEAD, usable "objects" directory, and
390 * a "git-daemon-export-ok" flag that says that the other side
391 * is ok with us doing this.
393 * path_ok() uses enter_repo() and does whitelist checking.
394 * We only need to make sure the repository is exported.
397 if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
398 logerror("'%s': repository not exported.", path);
399 errno = EACCES;
400 return daemon_error(dir, "repository not exported");
403 if (service->overridable) {
404 strbuf_addf(&var, "daemon.%s", service->config_name);
405 git_config_get_bool(var.buf, &enabled);
406 strbuf_release(&var);
408 if (!enabled) {
409 logerror("'%s': service not enabled for '%s'",
410 service->name, path);
411 errno = EACCES;
412 return daemon_error(dir, "service not enabled");
416 * Optionally, a hook can choose to deny access to the
417 * repository depending on the phase of the moon.
419 if (access_hook && run_access_hook(service, dir, path, hi))
420 return -1;
423 * We'll ignore SIGTERM from now on, we have a
424 * good client.
426 signal(SIGTERM, SIG_IGN);
428 return service->fn();
431 static void copy_to_log(int fd)
433 struct strbuf line = STRBUF_INIT;
434 FILE *fp;
436 fp = fdopen(fd, "r");
437 if (fp == NULL) {
438 logerror("fdopen of error channel failed");
439 close(fd);
440 return;
443 while (strbuf_getline_lf(&line, fp) != EOF) {
444 logerror("%s", line.buf);
445 strbuf_setlen(&line, 0);
448 strbuf_release(&line);
449 fclose(fp);
452 static int run_service_command(const char **argv)
454 struct child_process cld = CHILD_PROCESS_INIT;
456 cld.argv = argv;
457 cld.git_cmd = 1;
458 cld.err = -1;
459 if (start_command(&cld))
460 return -1;
462 close(0);
463 close(1);
465 copy_to_log(cld.err);
467 return finish_command(&cld);
470 static int upload_pack(void)
472 /* Timeout as string */
473 char timeout_buf[64];
474 const char *argv[] = { "upload-pack", "--strict", NULL, ".", NULL };
476 argv[2] = timeout_buf;
478 snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout);
479 return run_service_command(argv);
482 static int upload_archive(void)
484 static const char *argv[] = { "upload-archive", ".", NULL };
485 return run_service_command(argv);
488 static int receive_pack(void)
490 static const char *argv[] = { "receive-pack", ".", NULL };
491 return run_service_command(argv);
494 static struct daemon_service daemon_service[] = {
495 { "upload-archive", "uploadarch", upload_archive, 0, 1 },
496 { "upload-pack", "uploadpack", upload_pack, 1, 1 },
497 { "receive-pack", "receivepack", receive_pack, 0, 1 },
500 static void enable_service(const char *name, int ena)
502 int i;
503 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
504 if (!strcmp(daemon_service[i].name, name)) {
505 daemon_service[i].enabled = ena;
506 return;
509 die("No such service %s", name);
512 static void make_service_overridable(const char *name, int ena)
514 int i;
515 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
516 if (!strcmp(daemon_service[i].name, name)) {
517 daemon_service[i].overridable = ena;
518 return;
521 die("No such service %s", name);
524 static void parse_host_and_port(char *hostport, char **host,
525 char **port)
527 if (*hostport == '[') {
528 char *end;
530 end = strchr(hostport, ']');
531 if (!end)
532 die("Invalid request ('[' without ']')");
533 *end = '\0';
534 *host = hostport + 1;
535 if (!end[1])
536 *port = NULL;
537 else if (end[1] == ':')
538 *port = end + 2;
539 else
540 die("Garbage after end of host part");
541 } else {
542 *host = hostport;
543 *port = strrchr(hostport, ':');
544 if (*port) {
545 **port = '\0';
546 ++*port;
552 * Sanitize a string from the client so that it's OK to be inserted into a
553 * filesystem path. Specifically, we disallow slashes, runs of "..", and
554 * trailing and leading dots, which means that the client cannot escape
555 * our base path via ".." traversal.
557 static void sanitize_client(struct strbuf *out, const char *in)
559 for (; *in; in++) {
560 if (*in == '/')
561 continue;
562 if (*in == '.' && (!out->len || out->buf[out->len - 1] == '.'))
563 continue;
564 strbuf_addch(out, *in);
567 while (out->len && out->buf[out->len - 1] == '.')
568 strbuf_setlen(out, out->len - 1);
572 * Like sanitize_client, but we also perform any canonicalization
573 * to make life easier on the admin.
575 static void canonicalize_client(struct strbuf *out, const char *in)
577 sanitize_client(out, in);
578 strbuf_tolower(out);
582 * Read the host as supplied by the client connection.
584 static void parse_host_arg(struct hostinfo *hi, char *extra_args, int buflen)
586 char *val;
587 int vallen;
588 char *end = extra_args + buflen;
590 if (extra_args < end && *extra_args) {
591 hi->saw_extended_args = 1;
592 if (strncasecmp("host=", extra_args, 5) == 0) {
593 val = extra_args + 5;
594 vallen = strlen(val) + 1;
595 if (*val) {
596 /* Split <host>:<port> at colon. */
597 char *host;
598 char *port;
599 parse_host_and_port(val, &host, &port);
600 if (port)
601 sanitize_client(&hi->tcp_port, port);
602 canonicalize_client(&hi->hostname, host);
603 hi->hostname_lookup_done = 0;
606 /* On to the next one */
607 extra_args = val + vallen;
609 if (extra_args < end && *extra_args)
610 die("Invalid request");
615 * Locate canonical hostname and its IP address.
617 static void lookup_hostname(struct hostinfo *hi)
619 if (!hi->hostname_lookup_done && hi->hostname.len) {
620 #ifndef NO_IPV6
621 struct addrinfo hints;
622 struct addrinfo *ai;
623 int gai;
624 static char addrbuf[HOST_NAME_MAX + 1];
626 memset(&hints, 0, sizeof(hints));
627 hints.ai_flags = AI_CANONNAME;
629 gai = getaddrinfo(hi->hostname.buf, NULL, &hints, &ai);
630 if (!gai) {
631 struct sockaddr_in *sin_addr = (void *)ai->ai_addr;
633 inet_ntop(AF_INET, &sin_addr->sin_addr,
634 addrbuf, sizeof(addrbuf));
635 strbuf_addstr(&hi->ip_address, addrbuf);
637 if (ai->ai_canonname)
638 sanitize_client(&hi->canon_hostname,
639 ai->ai_canonname);
640 else
641 strbuf_addbuf(&hi->canon_hostname,
642 &hi->ip_address);
644 freeaddrinfo(ai);
646 #else
647 struct hostent *hent;
648 struct sockaddr_in sa;
649 char **ap;
650 static char addrbuf[HOST_NAME_MAX + 1];
652 hent = gethostbyname(hi->hostname.buf);
653 if (hent) {
654 ap = hent->h_addr_list;
655 memset(&sa, 0, sizeof sa);
656 sa.sin_family = hent->h_addrtype;
657 sa.sin_port = htons(0);
658 memcpy(&sa.sin_addr, *ap, hent->h_length);
660 inet_ntop(hent->h_addrtype, &sa.sin_addr,
661 addrbuf, sizeof(addrbuf));
663 sanitize_client(&hi->canon_hostname, hent->h_name);
664 strbuf_addstr(&hi->ip_address, addrbuf);
666 #endif
667 hi->hostname_lookup_done = 1;
671 static void hostinfo_init(struct hostinfo *hi)
673 memset(hi, 0, sizeof(*hi));
674 strbuf_init(&hi->hostname, 0);
675 strbuf_init(&hi->canon_hostname, 0);
676 strbuf_init(&hi->ip_address, 0);
677 strbuf_init(&hi->tcp_port, 0);
680 static void hostinfo_clear(struct hostinfo *hi)
682 strbuf_release(&hi->hostname);
683 strbuf_release(&hi->canon_hostname);
684 strbuf_release(&hi->ip_address);
685 strbuf_release(&hi->tcp_port);
688 static void set_keep_alive(int sockfd)
690 int ka = 1;
692 if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0) {
693 if (errno != ENOTSOCK)
694 logerror("unable to set SO_KEEPALIVE on socket: %s",
695 strerror(errno));
699 static int execute(void)
701 char *line = packet_buffer;
702 int pktlen, len, i;
703 char *addr = getenv("REMOTE_ADDR"), *port = getenv("REMOTE_PORT");
704 struct hostinfo hi;
706 hostinfo_init(&hi);
708 if (addr)
709 loginfo("Connection from %s:%s", addr, port);
711 set_keep_alive(0);
712 alarm(init_timeout ? init_timeout : timeout);
713 pktlen = packet_read(0, NULL, NULL, packet_buffer, sizeof(packet_buffer), 0);
714 alarm(0);
716 len = strlen(line);
717 if (pktlen != len)
718 loginfo("Extended attributes (%d bytes) exist <%.*s>",
719 (int) pktlen - len,
720 (int) pktlen - len, line + len + 1);
721 if (len && line[len-1] == '\n') {
722 line[--len] = 0;
723 pktlen--;
726 if (len != pktlen)
727 parse_host_arg(&hi, line + len + 1, pktlen - len - 1);
729 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
730 struct daemon_service *s = &(daemon_service[i]);
731 const char *arg;
733 if (skip_prefix(line, "git-", &arg) &&
734 skip_prefix(arg, s->name, &arg) &&
735 *arg++ == ' ') {
737 * Note: The directory here is probably context sensitive,
738 * and might depend on the actual service being performed.
740 int rc = run_service(arg, s, &hi);
741 hostinfo_clear(&hi);
742 return rc;
746 hostinfo_clear(&hi);
747 logerror("Protocol error: '%s'", line);
748 return -1;
751 static int addrcmp(const struct sockaddr_storage *s1,
752 const struct sockaddr_storage *s2)
754 const struct sockaddr *sa1 = (const struct sockaddr*) s1;
755 const struct sockaddr *sa2 = (const struct sockaddr*) s2;
757 if (sa1->sa_family != sa2->sa_family)
758 return sa1->sa_family - sa2->sa_family;
759 if (sa1->sa_family == AF_INET)
760 return memcmp(&((struct sockaddr_in *)s1)->sin_addr,
761 &((struct sockaddr_in *)s2)->sin_addr,
762 sizeof(struct in_addr));
763 #ifndef NO_IPV6
764 if (sa1->sa_family == AF_INET6)
765 return memcmp(&((struct sockaddr_in6 *)s1)->sin6_addr,
766 &((struct sockaddr_in6 *)s2)->sin6_addr,
767 sizeof(struct in6_addr));
768 #endif
769 return 0;
772 static int max_connections = 32;
774 static unsigned int live_children;
776 static struct child {
777 struct child *next;
778 struct child_process cld;
779 struct sockaddr_storage address;
780 } *firstborn;
782 static void add_child(struct child_process *cld, struct sockaddr *addr, socklen_t addrlen)
784 struct child *newborn, **cradle;
786 newborn = xcalloc(1, sizeof(*newborn));
787 live_children++;
788 memcpy(&newborn->cld, cld, sizeof(*cld));
789 memcpy(&newborn->address, addr, addrlen);
790 for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next)
791 if (!addrcmp(&(*cradle)->address, &newborn->address))
792 break;
793 newborn->next = *cradle;
794 *cradle = newborn;
798 * This gets called if the number of connections grows
799 * past "max_connections".
801 * We kill the newest connection from a duplicate IP.
803 static void kill_some_child(void)
805 const struct child *blanket, *next;
807 if (!(blanket = firstborn))
808 return;
810 for (; (next = blanket->next); blanket = next)
811 if (!addrcmp(&blanket->address, &next->address)) {
812 kill(blanket->cld.pid, SIGTERM);
813 break;
817 static void check_dead_children(void)
819 int status;
820 pid_t pid;
822 struct child **cradle, *blanket;
823 for (cradle = &firstborn; (blanket = *cradle);)
824 if ((pid = waitpid(blanket->cld.pid, &status, WNOHANG)) > 1) {
825 const char *dead = "";
826 if (status)
827 dead = " (with error)";
828 loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead);
830 /* remove the child */
831 *cradle = blanket->next;
832 live_children--;
833 child_process_clear(&blanket->cld);
834 free(blanket);
835 } else
836 cradle = &blanket->next;
839 static struct argv_array cld_argv = ARGV_ARRAY_INIT;
840 static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen)
842 struct child_process cld = CHILD_PROCESS_INIT;
844 if (max_connections && live_children >= max_connections) {
845 kill_some_child();
846 sleep(1); /* give it some time to die */
847 check_dead_children();
848 if (live_children >= max_connections) {
849 close(incoming);
850 logerror("Too many children, dropping connection");
851 return;
855 if (addr->sa_family == AF_INET) {
856 char buf[128] = "";
857 struct sockaddr_in *sin_addr = (void *) addr;
858 inet_ntop(addr->sa_family, &sin_addr->sin_addr, buf, sizeof(buf));
859 argv_array_pushf(&cld.env_array, "REMOTE_ADDR=%s", buf);
860 argv_array_pushf(&cld.env_array, "REMOTE_PORT=%d",
861 ntohs(sin_addr->sin_port));
862 #ifndef NO_IPV6
863 } else if (addr->sa_family == AF_INET6) {
864 char buf[128] = "";
865 struct sockaddr_in6 *sin6_addr = (void *) addr;
866 inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(buf));
867 argv_array_pushf(&cld.env_array, "REMOTE_ADDR=[%s]", buf);
868 argv_array_pushf(&cld.env_array, "REMOTE_PORT=%d",
869 ntohs(sin6_addr->sin6_port));
870 #endif
873 cld.argv = cld_argv.argv;
874 cld.in = incoming;
875 cld.out = dup(incoming);
877 if (start_command(&cld))
878 logerror("unable to fork");
879 else
880 add_child(&cld, addr, addrlen);
883 static void child_handler(int signo)
886 * Otherwise empty handler because systemcalls will get interrupted
887 * upon signal receipt
888 * SysV needs the handler to be rearmed
890 signal(SIGCHLD, child_handler);
893 static int set_reuse_addr(int sockfd)
895 int on = 1;
897 if (!reuseaddr)
898 return 0;
899 return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
900 &on, sizeof(on));
903 struct socketlist {
904 int *list;
905 size_t nr;
906 size_t alloc;
909 static const char *ip2str(int family, struct sockaddr *sin, socklen_t len)
911 #ifdef NO_IPV6
912 static char ip[INET_ADDRSTRLEN];
913 #else
914 static char ip[INET6_ADDRSTRLEN];
915 #endif
917 switch (family) {
918 #ifndef NO_IPV6
919 case AF_INET6:
920 inet_ntop(family, &((struct sockaddr_in6*)sin)->sin6_addr, ip, len);
921 break;
922 #endif
923 case AF_INET:
924 inet_ntop(family, &((struct sockaddr_in*)sin)->sin_addr, ip, len);
925 break;
926 default:
927 xsnprintf(ip, sizeof(ip), "<unknown>");
929 return ip;
932 #ifndef NO_IPV6
934 static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
936 int socknum = 0;
937 char pbuf[NI_MAXSERV];
938 struct addrinfo hints, *ai0, *ai;
939 int gai;
940 long flags;
942 xsnprintf(pbuf, sizeof(pbuf), "%d", listen_port);
943 memset(&hints, 0, sizeof(hints));
944 hints.ai_family = AF_UNSPEC;
945 hints.ai_socktype = SOCK_STREAM;
946 hints.ai_protocol = IPPROTO_TCP;
947 hints.ai_flags = AI_PASSIVE;
949 gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0);
950 if (gai) {
951 logerror("getaddrinfo() for %s failed: %s", listen_addr, gai_strerror(gai));
952 return 0;
955 for (ai = ai0; ai; ai = ai->ai_next) {
956 int sockfd;
958 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
959 if (sockfd < 0)
960 continue;
961 if (sockfd >= FD_SETSIZE) {
962 logerror("Socket descriptor too large");
963 close(sockfd);
964 continue;
967 #ifdef IPV6_V6ONLY
968 if (ai->ai_family == AF_INET6) {
969 int on = 1;
970 setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
971 &on, sizeof(on));
972 /* Note: error is not fatal */
974 #endif
976 if (set_reuse_addr(sockfd)) {
977 logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
978 close(sockfd);
979 continue;
982 set_keep_alive(sockfd);
984 if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
985 logerror("Could not bind to %s: %s",
986 ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
987 strerror(errno));
988 close(sockfd);
989 continue; /* not fatal */
991 if (listen(sockfd, 5) < 0) {
992 logerror("Could not listen to %s: %s",
993 ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
994 strerror(errno));
995 close(sockfd);
996 continue; /* not fatal */
999 flags = fcntl(sockfd, F_GETFD, 0);
1000 if (flags >= 0)
1001 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
1003 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
1004 socklist->list[socklist->nr++] = sockfd;
1005 socknum++;
1008 freeaddrinfo(ai0);
1010 return socknum;
1013 #else /* NO_IPV6 */
1015 static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
1017 struct sockaddr_in sin;
1018 int sockfd;
1019 long flags;
1021 memset(&sin, 0, sizeof sin);
1022 sin.sin_family = AF_INET;
1023 sin.sin_port = htons(listen_port);
1025 if (listen_addr) {
1026 /* Well, host better be an IP address here. */
1027 if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0)
1028 return 0;
1029 } else {
1030 sin.sin_addr.s_addr = htonl(INADDR_ANY);
1033 sockfd = socket(AF_INET, SOCK_STREAM, 0);
1034 if (sockfd < 0)
1035 return 0;
1037 if (set_reuse_addr(sockfd)) {
1038 logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
1039 close(sockfd);
1040 return 0;
1043 set_keep_alive(sockfd);
1045 if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
1046 logerror("Could not bind to %s: %s",
1047 ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
1048 strerror(errno));
1049 close(sockfd);
1050 return 0;
1053 if (listen(sockfd, 5) < 0) {
1054 logerror("Could not listen to %s: %s",
1055 ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
1056 strerror(errno));
1057 close(sockfd);
1058 return 0;
1061 flags = fcntl(sockfd, F_GETFD, 0);
1062 if (flags >= 0)
1063 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
1065 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
1066 socklist->list[socklist->nr++] = sockfd;
1067 return 1;
1070 #endif
1072 static void socksetup(struct string_list *listen_addr, int listen_port, struct socketlist *socklist)
1074 if (!listen_addr->nr)
1075 setup_named_sock(NULL, listen_port, socklist);
1076 else {
1077 int i, socknum;
1078 for (i = 0; i < listen_addr->nr; i++) {
1079 socknum = setup_named_sock(listen_addr->items[i].string,
1080 listen_port, socklist);
1082 if (socknum == 0)
1083 logerror("unable to allocate any listen sockets for host %s on port %u",
1084 listen_addr->items[i].string, listen_port);
1089 static int service_loop(struct socketlist *socklist)
1091 struct pollfd *pfd;
1092 int i;
1094 pfd = xcalloc(socklist->nr, sizeof(struct pollfd));
1096 for (i = 0; i < socklist->nr; i++) {
1097 pfd[i].fd = socklist->list[i];
1098 pfd[i].events = POLLIN;
1101 signal(SIGCHLD, child_handler);
1103 for (;;) {
1104 int i;
1106 check_dead_children();
1108 if (poll(pfd, socklist->nr, -1) < 0) {
1109 if (errno != EINTR) {
1110 logerror("Poll failed, resuming: %s",
1111 strerror(errno));
1112 sleep(1);
1114 continue;
1117 for (i = 0; i < socklist->nr; i++) {
1118 if (pfd[i].revents & POLLIN) {
1119 union {
1120 struct sockaddr sa;
1121 struct sockaddr_in sai;
1122 #ifndef NO_IPV6
1123 struct sockaddr_in6 sai6;
1124 #endif
1125 } ss;
1126 socklen_t sslen = sizeof(ss);
1127 int incoming = accept(pfd[i].fd, &ss.sa, &sslen);
1128 if (incoming < 0) {
1129 switch (errno) {
1130 case EAGAIN:
1131 case EINTR:
1132 case ECONNABORTED:
1133 continue;
1134 default:
1135 die_errno("accept returned");
1138 handle(incoming, &ss.sa, sslen);
1144 #ifdef NO_POSIX_GOODIES
1146 struct credentials;
1148 static void drop_privileges(struct credentials *cred)
1150 /* nothing */
1153 static struct credentials *prepare_credentials(const char *user_name,
1154 const char *group_name)
1156 die("--user not supported on this platform");
1159 #else
1161 struct credentials {
1162 struct passwd *pass;
1163 gid_t gid;
1166 static void drop_privileges(struct credentials *cred)
1168 if (cred && (initgroups(cred->pass->pw_name, cred->gid) ||
1169 setgid (cred->gid) || setuid(cred->pass->pw_uid)))
1170 die("cannot drop privileges");
1173 static struct credentials *prepare_credentials(const char *user_name,
1174 const char *group_name)
1176 static struct credentials c;
1178 c.pass = getpwnam(user_name);
1179 if (!c.pass)
1180 die("user not found - %s", user_name);
1182 if (!group_name)
1183 c.gid = c.pass->pw_gid;
1184 else {
1185 struct group *group = getgrnam(group_name);
1186 if (!group)
1187 die("group not found - %s", group_name);
1189 c.gid = group->gr_gid;
1192 return &c;
1194 #endif
1196 static int serve(struct string_list *listen_addr, int listen_port,
1197 struct credentials *cred)
1199 struct socketlist socklist = { NULL, 0, 0 };
1201 socksetup(listen_addr, listen_port, &socklist);
1202 if (socklist.nr == 0)
1203 die("unable to allocate any listen sockets on port %u",
1204 listen_port);
1206 drop_privileges(cred);
1208 loginfo("Ready to rumble");
1210 return service_loop(&socklist);
1213 int cmd_main(int argc, const char **argv)
1215 int listen_port = 0;
1216 struct string_list listen_addr = STRING_LIST_INIT_NODUP;
1217 int serve_mode = 0, inetd_mode = 0;
1218 const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
1219 int detach = 0;
1220 struct credentials *cred = NULL;
1221 int i;
1223 for (i = 1; i < argc; i++) {
1224 const char *arg = argv[i];
1225 const char *v;
1227 if (skip_prefix(arg, "--listen=", &v)) {
1228 string_list_append(&listen_addr, xstrdup_tolower(v));
1229 continue;
1231 if (skip_prefix(arg, "--port=", &v)) {
1232 char *end;
1233 unsigned long n;
1234 n = strtoul(v, &end, 0);
1235 if (*v && !*end) {
1236 listen_port = n;
1237 continue;
1240 if (!strcmp(arg, "--serve")) {
1241 serve_mode = 1;
1242 continue;
1244 if (!strcmp(arg, "--inetd")) {
1245 inetd_mode = 1;
1246 log_syslog = 1;
1247 continue;
1249 if (!strcmp(arg, "--verbose")) {
1250 verbose = 1;
1251 continue;
1253 if (!strcmp(arg, "--syslog")) {
1254 log_syslog = 1;
1255 continue;
1257 if (!strcmp(arg, "--export-all")) {
1258 export_all_trees = 1;
1259 continue;
1261 if (skip_prefix(arg, "--access-hook=", &v)) {
1262 access_hook = v;
1263 continue;
1265 if (skip_prefix(arg, "--timeout=", &v)) {
1266 timeout = atoi(v);
1267 continue;
1269 if (skip_prefix(arg, "--init-timeout=", &v)) {
1270 init_timeout = atoi(v);
1271 continue;
1273 if (skip_prefix(arg, "--max-connections=", &v)) {
1274 max_connections = atoi(v);
1275 if (max_connections < 0)
1276 max_connections = 0; /* unlimited */
1277 continue;
1279 if (!strcmp(arg, "--strict-paths")) {
1280 strict_paths = 1;
1281 continue;
1283 if (skip_prefix(arg, "--base-path=", &v)) {
1284 base_path = v;
1285 continue;
1287 if (!strcmp(arg, "--base-path-relaxed")) {
1288 base_path_relaxed = 1;
1289 continue;
1291 if (skip_prefix(arg, "--interpolated-path=", &v)) {
1292 interpolated_path = v;
1293 continue;
1295 if (!strcmp(arg, "--reuseaddr")) {
1296 reuseaddr = 1;
1297 continue;
1299 if (!strcmp(arg, "--user-path")) {
1300 user_path = "";
1301 continue;
1303 if (skip_prefix(arg, "--user-path=", &v)) {
1304 user_path = v;
1305 continue;
1307 if (skip_prefix(arg, "--pid-file=", &v)) {
1308 pid_file = v;
1309 continue;
1311 if (!strcmp(arg, "--detach")) {
1312 detach = 1;
1313 log_syslog = 1;
1314 continue;
1316 if (skip_prefix(arg, "--user=", &v)) {
1317 user_name = v;
1318 continue;
1320 if (skip_prefix(arg, "--group=", &v)) {
1321 group_name = v;
1322 continue;
1324 if (skip_prefix(arg, "--enable=", &v)) {
1325 enable_service(v, 1);
1326 continue;
1328 if (skip_prefix(arg, "--disable=", &v)) {
1329 enable_service(v, 0);
1330 continue;
1332 if (skip_prefix(arg, "--allow-override=", &v)) {
1333 make_service_overridable(v, 1);
1334 continue;
1336 if (skip_prefix(arg, "--forbid-override=", &v)) {
1337 make_service_overridable(v, 0);
1338 continue;
1340 if (!strcmp(arg, "--informative-errors")) {
1341 informative_errors = 1;
1342 continue;
1344 if (!strcmp(arg, "--no-informative-errors")) {
1345 informative_errors = 0;
1346 continue;
1348 if (!strcmp(arg, "--")) {
1349 ok_paths = &argv[i+1];
1350 break;
1351 } else if (arg[0] != '-') {
1352 ok_paths = &argv[i];
1353 break;
1356 usage(daemon_usage);
1359 if (log_syslog) {
1360 openlog("git-daemon", LOG_PID, LOG_DAEMON);
1361 set_die_routine(daemon_die);
1362 } else
1363 /* avoid splitting a message in the middle */
1364 setvbuf(stderr, NULL, _IOFBF, 4096);
1366 if (inetd_mode && (detach || group_name || user_name))
1367 die("--detach, --user and --group are incompatible with --inetd");
1369 if (inetd_mode && (listen_port || (listen_addr.nr > 0)))
1370 die("--listen= and --port= are incompatible with --inetd");
1371 else if (listen_port == 0)
1372 listen_port = DEFAULT_GIT_PORT;
1374 if (group_name && !user_name)
1375 die("--group supplied without --user");
1377 if (user_name)
1378 cred = prepare_credentials(user_name, group_name);
1380 if (strict_paths && (!ok_paths || !*ok_paths))
1381 die("option --strict-paths requires a whitelist");
1383 if (base_path && !is_directory(base_path))
1384 die("base-path '%s' does not exist or is not a directory",
1385 base_path);
1387 if (inetd_mode) {
1388 if (!freopen("/dev/null", "w", stderr))
1389 die_errno("failed to redirect stderr to /dev/null");
1392 if (inetd_mode || serve_mode)
1393 return execute();
1395 if (detach) {
1396 if (daemonize())
1397 die("--detach not supported on this platform");
1400 if (pid_file)
1401 write_file(pid_file, "%"PRIuMAX, (uintmax_t) getpid());
1403 /* prepare argv for serving-processes */
1404 argv_array_push(&cld_argv, argv[0]); /* git-daemon */
1405 argv_array_push(&cld_argv, "--serve");
1406 for (i = 1; i < argc; ++i)
1407 argv_array_push(&cld_argv, argv[i]);
1409 return serve(&listen_addr, listen_port, cred);