Merge tag 'v2.14.1'
[git/raj.git] / daemon.c
blob30747075f0c45942220f63202f8c984e3e0956a7
1 #include "cache.h"
2 #include "config.h"
3 #include "pkt-line.h"
4 #include "run-command.h"
5 #include "strbuf.h"
6 #include "string-list.h"
8 #ifdef NO_INITGROUPS
9 #define initgroups(x, y) (0) /* nothing */
10 #endif
12 static int log_syslog;
13 static int verbose;
14 static int reuseaddr;
15 static int informative_errors;
17 static const char daemon_usage[] =
18 "git daemon [--verbose] [--syslog] [--export-all]\n"
19 " [--timeout=<n>] [--init-timeout=<n>] [--max-connections=<n>]\n"
20 " [--strict-paths] [--base-path=<path>] [--base-path-relaxed]\n"
21 " [--user-path | --user-path=<path>]\n"
22 " [--interpolated-path=<path>]\n"
23 " [--reuseaddr] [--pid-file=<file>]\n"
24 " [--(enable|disable|allow-override|forbid-override)=<service>]\n"
25 " [--access-hook=<path>]\n"
26 " [--inetd | [--listen=<host_or_ipaddr>] [--port=<n>]\n"
27 " [--detach] [--user=<user> [--group=<group>]]\n"
28 " [<directory>...]";
30 /* List of acceptable pathname prefixes */
31 static const char **ok_paths;
32 static int strict_paths;
34 /* If this is set, git-daemon-export-ok is not required */
35 static int export_all_trees;
37 /* Take all paths relative to this one if non-NULL */
38 static const char *base_path;
39 static const char *interpolated_path;
40 static int base_path_relaxed;
42 /* If defined, ~user notation is allowed and the string is inserted
43 * after ~user/. E.g. a request to git://host/~alice/frotz would
44 * go to /home/alice/pub_git/frotz with --user-path=pub_git.
46 static const char *user_path;
48 /* Timeout, and initial timeout */
49 static unsigned int timeout;
50 static unsigned int init_timeout;
52 struct hostinfo {
53 struct strbuf hostname;
54 struct strbuf canon_hostname;
55 struct strbuf ip_address;
56 struct strbuf tcp_port;
57 unsigned int hostname_lookup_done:1;
58 unsigned int saw_extended_args:1;
61 static void lookup_hostname(struct hostinfo *hi);
63 static const char *get_canon_hostname(struct hostinfo *hi)
65 lookup_hostname(hi);
66 return hi->canon_hostname.buf;
69 static const char *get_ip_address(struct hostinfo *hi)
71 lookup_hostname(hi);
72 return hi->ip_address.buf;
75 static void logreport(int priority, const char *err, va_list params)
77 if (log_syslog) {
78 char buf[1024];
79 vsnprintf(buf, sizeof(buf), err, params);
80 syslog(priority, "%s", buf);
81 } else {
83 * Since stderr is set to buffered mode, the
84 * logging of different processes will not overlap
85 * unless they overflow the (rather big) buffers.
87 fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid());
88 vfprintf(stderr, err, params);
89 fputc('\n', stderr);
90 fflush(stderr);
94 __attribute__((format (printf, 1, 2)))
95 static void logerror(const char *err, ...)
97 va_list params;
98 va_start(params, err);
99 logreport(LOG_ERR, err, params);
100 va_end(params);
103 __attribute__((format (printf, 1, 2)))
104 static void loginfo(const char *err, ...)
106 va_list params;
107 if (!verbose)
108 return;
109 va_start(params, err);
110 logreport(LOG_INFO, err, params);
111 va_end(params);
114 static void NORETURN daemon_die(const char *err, va_list params)
116 logreport(LOG_ERR, err, params);
117 exit(1);
120 struct expand_path_context {
121 const char *directory;
122 struct hostinfo *hostinfo;
125 static size_t expand_path(struct strbuf *sb, const char *placeholder, void *ctx)
127 struct expand_path_context *context = ctx;
128 struct hostinfo *hi = context->hostinfo;
130 switch (placeholder[0]) {
131 case 'H':
132 strbuf_addbuf(sb, &hi->hostname);
133 return 1;
134 case 'C':
135 if (placeholder[1] == 'H') {
136 strbuf_addstr(sb, get_canon_hostname(hi));
137 return 2;
139 break;
140 case 'I':
141 if (placeholder[1] == 'P') {
142 strbuf_addstr(sb, get_ip_address(hi));
143 return 2;
145 break;
146 case 'P':
147 strbuf_addbuf(sb, &hi->tcp_port);
148 return 1;
149 case 'D':
150 strbuf_addstr(sb, context->directory);
151 return 1;
153 return 0;
156 static const char *path_ok(const char *directory, struct hostinfo *hi)
158 static char rpath[PATH_MAX];
159 static char interp_path[PATH_MAX];
160 size_t rlen;
161 const char *path;
162 const char *dir;
164 dir = directory;
166 if (daemon_avoid_alias(dir)) {
167 logerror("'%s': aliased", dir);
168 return NULL;
171 if (*dir == '~') {
172 if (!user_path) {
173 logerror("'%s': User-path not allowed", dir);
174 return NULL;
176 if (*user_path) {
177 /* Got either "~alice" or "~alice/foo";
178 * rewrite them to "~alice/%s" or
179 * "~alice/%s/foo".
181 int namlen, restlen = strlen(dir);
182 const char *slash = strchr(dir, '/');
183 if (!slash)
184 slash = dir + restlen;
185 namlen = slash - dir;
186 restlen -= namlen;
187 loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
188 rlen = snprintf(rpath, sizeof(rpath), "%.*s/%s%.*s",
189 namlen, dir, user_path, restlen, slash);
190 if (rlen >= sizeof(rpath)) {
191 logerror("user-path too large: %s", rpath);
192 return NULL;
194 dir = rpath;
197 else if (interpolated_path && hi->saw_extended_args) {
198 struct strbuf expanded_path = STRBUF_INIT;
199 struct expand_path_context context;
201 context.directory = directory;
202 context.hostinfo = hi;
204 if (*dir != '/') {
205 /* Allow only absolute */
206 logerror("'%s': Non-absolute path denied (interpolated-path active)", dir);
207 return NULL;
210 strbuf_expand(&expanded_path, interpolated_path,
211 expand_path, &context);
213 rlen = strlcpy(interp_path, expanded_path.buf,
214 sizeof(interp_path));
215 if (rlen >= sizeof(interp_path)) {
216 logerror("interpolated path too large: %s",
217 interp_path);
218 return NULL;
221 strbuf_release(&expanded_path);
222 loginfo("Interpolated dir '%s'", interp_path);
224 dir = interp_path;
226 else if (base_path) {
227 if (*dir != '/') {
228 /* Allow only absolute */
229 logerror("'%s': Non-absolute path denied (base-path active)", dir);
230 return NULL;
232 rlen = snprintf(rpath, sizeof(rpath), "%s%s", base_path, dir);
233 if (rlen >= sizeof(rpath)) {
234 logerror("base-path too large: %s", rpath);
235 return NULL;
237 dir = rpath;
240 path = enter_repo(dir, strict_paths);
241 if (!path && base_path && base_path_relaxed) {
243 * if we fail and base_path_relaxed is enabled, try without
244 * prefixing the base path
246 dir = directory;
247 path = enter_repo(dir, strict_paths);
250 if (!path) {
251 logerror("'%s' does not appear to be a git repository", dir);
252 return NULL;
255 if ( ok_paths && *ok_paths ) {
256 const char **pp;
257 int pathlen = strlen(path);
259 /* The validation is done on the paths after enter_repo
260 * appends optional {.git,.git/.git} and friends, but
261 * it does not use getcwd(). So if your /pub is
262 * a symlink to /mnt/pub, you can whitelist /pub and
263 * do not have to say /mnt/pub.
264 * Do not say /pub/.
266 for ( pp = ok_paths ; *pp ; pp++ ) {
267 int len = strlen(*pp);
268 if (len <= pathlen &&
269 !memcmp(*pp, path, len) &&
270 (path[len] == '\0' ||
271 (!strict_paths && path[len] == '/')))
272 return path;
275 else {
276 /* be backwards compatible */
277 if (!strict_paths)
278 return path;
281 logerror("'%s': not in whitelist", path);
282 return NULL; /* Fallthrough. Deny by default */
285 typedef int (*daemon_service_fn)(void);
286 struct daemon_service {
287 const char *name;
288 const char *config_name;
289 daemon_service_fn fn;
290 int enabled;
291 int overridable;
294 static int daemon_error(const char *dir, const char *msg)
296 if (!informative_errors)
297 msg = "access denied or repository not exported";
298 packet_write_fmt(1, "ERR %s: %s", msg, dir);
299 return -1;
302 static const char *access_hook;
304 static int run_access_hook(struct daemon_service *service, const char *dir,
305 const char *path, struct hostinfo *hi)
307 struct child_process child = CHILD_PROCESS_INIT;
308 struct strbuf buf = STRBUF_INIT;
309 const char *argv[8];
310 const char **arg = argv;
311 char *eol;
312 int seen_errors = 0;
314 *arg++ = access_hook;
315 *arg++ = service->name;
316 *arg++ = path;
317 *arg++ = hi->hostname.buf;
318 *arg++ = get_canon_hostname(hi);
319 *arg++ = get_ip_address(hi);
320 *arg++ = hi->tcp_port.buf;
321 *arg = NULL;
323 child.use_shell = 1;
324 child.argv = argv;
325 child.no_stdin = 1;
326 child.no_stderr = 1;
327 child.out = -1;
328 if (start_command(&child)) {
329 logerror("daemon access hook '%s' failed to start",
330 access_hook);
331 goto error_return;
333 if (strbuf_read(&buf, child.out, 0) < 0) {
334 logerror("failed to read from pipe to daemon access hook '%s'",
335 access_hook);
336 strbuf_reset(&buf);
337 seen_errors = 1;
339 if (close(child.out) < 0) {
340 logerror("failed to close pipe to daemon access hook '%s'",
341 access_hook);
342 seen_errors = 1;
344 if (finish_command(&child))
345 seen_errors = 1;
347 if (!seen_errors) {
348 strbuf_release(&buf);
349 return 0;
352 error_return:
353 strbuf_ltrim(&buf);
354 if (!buf.len)
355 strbuf_addstr(&buf, "service rejected");
356 eol = strchr(buf.buf, '\n');
357 if (eol)
358 *eol = '\0';
359 errno = EACCES;
360 daemon_error(dir, buf.buf);
361 strbuf_release(&buf);
362 return -1;
365 static int run_service(const char *dir, struct daemon_service *service,
366 struct hostinfo *hi)
368 const char *path;
369 int enabled = service->enabled;
370 struct strbuf var = STRBUF_INIT;
372 loginfo("Request %s for '%s'", service->name, dir);
374 if (!enabled && !service->overridable) {
375 logerror("'%s': service not enabled.", service->name);
376 errno = EACCES;
377 return daemon_error(dir, "service not enabled");
380 if (!(path = path_ok(dir, hi)))
381 return daemon_error(dir, "no such repository");
384 * Security on the cheap.
386 * We want a readable HEAD, usable "objects" directory, and
387 * a "git-daemon-export-ok" flag that says that the other side
388 * is ok with us doing this.
390 * path_ok() uses enter_repo() and does whitelist checking.
391 * We only need to make sure the repository is exported.
394 if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
395 logerror("'%s': repository not exported.", path);
396 errno = EACCES;
397 return daemon_error(dir, "repository not exported");
400 if (service->overridable) {
401 strbuf_addf(&var, "daemon.%s", service->config_name);
402 git_config_get_bool(var.buf, &enabled);
403 strbuf_release(&var);
405 if (!enabled) {
406 logerror("'%s': service not enabled for '%s'",
407 service->name, path);
408 errno = EACCES;
409 return daemon_error(dir, "service not enabled");
413 * Optionally, a hook can choose to deny access to the
414 * repository depending on the phase of the moon.
416 if (access_hook && run_access_hook(service, dir, path, hi))
417 return -1;
420 * We'll ignore SIGTERM from now on, we have a
421 * good client.
423 signal(SIGTERM, SIG_IGN);
425 return service->fn();
428 static void copy_to_log(int fd)
430 struct strbuf line = STRBUF_INIT;
431 FILE *fp;
433 fp = fdopen(fd, "r");
434 if (fp == NULL) {
435 logerror("fdopen of error channel failed");
436 close(fd);
437 return;
440 while (strbuf_getline_lf(&line, fp) != EOF) {
441 logerror("%s", line.buf);
442 strbuf_setlen(&line, 0);
445 strbuf_release(&line);
446 fclose(fp);
449 static int run_service_command(struct child_process *cld)
451 argv_array_push(&cld->args, ".");
452 cld->git_cmd = 1;
453 cld->err = -1;
454 if (start_command(cld))
455 return -1;
457 close(0);
458 close(1);
460 copy_to_log(cld->err);
462 return finish_command(cld);
465 static int upload_pack(void)
467 struct child_process cld = CHILD_PROCESS_INIT;
468 argv_array_pushl(&cld.args, "upload-pack", "--strict", NULL);
469 argv_array_pushf(&cld.args, "--timeout=%u", timeout);
470 return run_service_command(&cld);
473 static int upload_archive(void)
475 struct child_process cld = CHILD_PROCESS_INIT;
476 argv_array_push(&cld.args, "upload-archive");
477 return run_service_command(&cld);
480 static int receive_pack(void)
482 struct child_process cld = CHILD_PROCESS_INIT;
483 argv_array_push(&cld.args, "receive-pack");
484 return run_service_command(&cld);
487 static struct daemon_service daemon_service[] = {
488 { "upload-archive", "uploadarch", upload_archive, 0, 1 },
489 { "upload-pack", "uploadpack", upload_pack, 1, 1 },
490 { "receive-pack", "receivepack", receive_pack, 0, 1 },
493 static void enable_service(const char *name, int ena)
495 int i;
496 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
497 if (!strcmp(daemon_service[i].name, name)) {
498 daemon_service[i].enabled = ena;
499 return;
502 die("No such service %s", name);
505 static void make_service_overridable(const char *name, int ena)
507 int i;
508 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
509 if (!strcmp(daemon_service[i].name, name)) {
510 daemon_service[i].overridable = ena;
511 return;
514 die("No such service %s", name);
517 static void parse_host_and_port(char *hostport, char **host,
518 char **port)
520 if (*hostport == '[') {
521 char *end;
523 end = strchr(hostport, ']');
524 if (!end)
525 die("Invalid request ('[' without ']')");
526 *end = '\0';
527 *host = hostport + 1;
528 if (!end[1])
529 *port = NULL;
530 else if (end[1] == ':')
531 *port = end + 2;
532 else
533 die("Garbage after end of host part");
534 } else {
535 *host = hostport;
536 *port = strrchr(hostport, ':');
537 if (*port) {
538 **port = '\0';
539 ++*port;
545 * Sanitize a string from the client so that it's OK to be inserted into a
546 * filesystem path. Specifically, we disallow slashes, runs of "..", and
547 * trailing and leading dots, which means that the client cannot escape
548 * our base path via ".." traversal.
550 static void sanitize_client(struct strbuf *out, const char *in)
552 for (; *in; in++) {
553 if (*in == '/')
554 continue;
555 if (*in == '.' && (!out->len || out->buf[out->len - 1] == '.'))
556 continue;
557 strbuf_addch(out, *in);
560 while (out->len && out->buf[out->len - 1] == '.')
561 strbuf_setlen(out, out->len - 1);
565 * Like sanitize_client, but we also perform any canonicalization
566 * to make life easier on the admin.
568 static void canonicalize_client(struct strbuf *out, const char *in)
570 sanitize_client(out, in);
571 strbuf_tolower(out);
575 * Read the host as supplied by the client connection.
577 static void parse_host_arg(struct hostinfo *hi, char *extra_args, int buflen)
579 char *val;
580 int vallen;
581 char *end = extra_args + buflen;
583 if (extra_args < end && *extra_args) {
584 hi->saw_extended_args = 1;
585 if (strncasecmp("host=", extra_args, 5) == 0) {
586 val = extra_args + 5;
587 vallen = strlen(val) + 1;
588 if (*val) {
589 /* Split <host>:<port> at colon. */
590 char *host;
591 char *port;
592 parse_host_and_port(val, &host, &port);
593 if (port)
594 sanitize_client(&hi->tcp_port, port);
595 canonicalize_client(&hi->hostname, host);
596 hi->hostname_lookup_done = 0;
599 /* On to the next one */
600 extra_args = val + vallen;
602 if (extra_args < end && *extra_args)
603 die("Invalid request");
608 * Locate canonical hostname and its IP address.
610 static void lookup_hostname(struct hostinfo *hi)
612 if (!hi->hostname_lookup_done && hi->hostname.len) {
613 #ifndef NO_IPV6
614 struct addrinfo hints;
615 struct addrinfo *ai;
616 int gai;
617 static char addrbuf[HOST_NAME_MAX + 1];
619 memset(&hints, 0, sizeof(hints));
620 hints.ai_flags = AI_CANONNAME;
622 gai = getaddrinfo(hi->hostname.buf, NULL, &hints, &ai);
623 if (!gai) {
624 struct sockaddr_in *sin_addr = (void *)ai->ai_addr;
626 inet_ntop(AF_INET, &sin_addr->sin_addr,
627 addrbuf, sizeof(addrbuf));
628 strbuf_addstr(&hi->ip_address, addrbuf);
630 if (ai->ai_canonname)
631 sanitize_client(&hi->canon_hostname,
632 ai->ai_canonname);
633 else
634 strbuf_addbuf(&hi->canon_hostname,
635 &hi->ip_address);
637 freeaddrinfo(ai);
639 #else
640 struct hostent *hent;
641 struct sockaddr_in sa;
642 char **ap;
643 static char addrbuf[HOST_NAME_MAX + 1];
645 hent = gethostbyname(hi->hostname.buf);
646 if (hent) {
647 ap = hent->h_addr_list;
648 memset(&sa, 0, sizeof sa);
649 sa.sin_family = hent->h_addrtype;
650 sa.sin_port = htons(0);
651 memcpy(&sa.sin_addr, *ap, hent->h_length);
653 inet_ntop(hent->h_addrtype, &sa.sin_addr,
654 addrbuf, sizeof(addrbuf));
656 sanitize_client(&hi->canon_hostname, hent->h_name);
657 strbuf_addstr(&hi->ip_address, addrbuf);
659 #endif
660 hi->hostname_lookup_done = 1;
664 static void hostinfo_init(struct hostinfo *hi)
666 memset(hi, 0, sizeof(*hi));
667 strbuf_init(&hi->hostname, 0);
668 strbuf_init(&hi->canon_hostname, 0);
669 strbuf_init(&hi->ip_address, 0);
670 strbuf_init(&hi->tcp_port, 0);
673 static void hostinfo_clear(struct hostinfo *hi)
675 strbuf_release(&hi->hostname);
676 strbuf_release(&hi->canon_hostname);
677 strbuf_release(&hi->ip_address);
678 strbuf_release(&hi->tcp_port);
681 static void set_keep_alive(int sockfd)
683 int ka = 1;
685 if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0) {
686 if (errno != ENOTSOCK)
687 logerror("unable to set SO_KEEPALIVE on socket: %s",
688 strerror(errno));
692 static int execute(void)
694 char *line = packet_buffer;
695 int pktlen, len, i;
696 char *addr = getenv("REMOTE_ADDR"), *port = getenv("REMOTE_PORT");
697 struct hostinfo hi;
699 hostinfo_init(&hi);
701 if (addr)
702 loginfo("Connection from %s:%s", addr, port);
704 set_keep_alive(0);
705 alarm(init_timeout ? init_timeout : timeout);
706 pktlen = packet_read(0, NULL, NULL, packet_buffer, sizeof(packet_buffer), 0);
707 alarm(0);
709 len = strlen(line);
710 if (pktlen != len)
711 loginfo("Extended attributes (%d bytes) exist <%.*s>",
712 (int) pktlen - len,
713 (int) pktlen - len, line + len + 1);
714 if (len && line[len-1] == '\n') {
715 line[--len] = 0;
716 pktlen--;
719 if (len != pktlen)
720 parse_host_arg(&hi, line + len + 1, pktlen - len - 1);
722 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
723 struct daemon_service *s = &(daemon_service[i]);
724 const char *arg;
726 if (skip_prefix(line, "git-", &arg) &&
727 skip_prefix(arg, s->name, &arg) &&
728 *arg++ == ' ') {
730 * Note: The directory here is probably context sensitive,
731 * and might depend on the actual service being performed.
733 int rc = run_service(arg, s, &hi);
734 hostinfo_clear(&hi);
735 return rc;
739 hostinfo_clear(&hi);
740 logerror("Protocol error: '%s'", line);
741 return -1;
744 static int addrcmp(const struct sockaddr_storage *s1,
745 const struct sockaddr_storage *s2)
747 const struct sockaddr *sa1 = (const struct sockaddr*) s1;
748 const struct sockaddr *sa2 = (const struct sockaddr*) s2;
750 if (sa1->sa_family != sa2->sa_family)
751 return sa1->sa_family - sa2->sa_family;
752 if (sa1->sa_family == AF_INET)
753 return memcmp(&((struct sockaddr_in *)s1)->sin_addr,
754 &((struct sockaddr_in *)s2)->sin_addr,
755 sizeof(struct in_addr));
756 #ifndef NO_IPV6
757 if (sa1->sa_family == AF_INET6)
758 return memcmp(&((struct sockaddr_in6 *)s1)->sin6_addr,
759 &((struct sockaddr_in6 *)s2)->sin6_addr,
760 sizeof(struct in6_addr));
761 #endif
762 return 0;
765 static int max_connections = 32;
767 static unsigned int live_children;
769 static struct child {
770 struct child *next;
771 struct child_process cld;
772 struct sockaddr_storage address;
773 } *firstborn;
775 static void add_child(struct child_process *cld, struct sockaddr *addr, socklen_t addrlen)
777 struct child *newborn, **cradle;
779 newborn = xcalloc(1, sizeof(*newborn));
780 live_children++;
781 memcpy(&newborn->cld, cld, sizeof(*cld));
782 memcpy(&newborn->address, addr, addrlen);
783 for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next)
784 if (!addrcmp(&(*cradle)->address, &newborn->address))
785 break;
786 newborn->next = *cradle;
787 *cradle = newborn;
791 * This gets called if the number of connections grows
792 * past "max_connections".
794 * We kill the newest connection from a duplicate IP.
796 static void kill_some_child(void)
798 const struct child *blanket, *next;
800 if (!(blanket = firstborn))
801 return;
803 for (; (next = blanket->next); blanket = next)
804 if (!addrcmp(&blanket->address, &next->address)) {
805 kill(blanket->cld.pid, SIGTERM);
806 break;
810 static void check_dead_children(void)
812 int status;
813 pid_t pid;
815 struct child **cradle, *blanket;
816 for (cradle = &firstborn; (blanket = *cradle);)
817 if ((pid = waitpid(blanket->cld.pid, &status, WNOHANG)) > 1) {
818 const char *dead = "";
819 if (status)
820 dead = " (with error)";
821 loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead);
823 /* remove the child */
824 *cradle = blanket->next;
825 live_children--;
826 child_process_clear(&blanket->cld);
827 free(blanket);
828 } else
829 cradle = &blanket->next;
832 static struct argv_array cld_argv = ARGV_ARRAY_INIT;
833 static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen)
835 struct child_process cld = CHILD_PROCESS_INIT;
837 if (max_connections && live_children >= max_connections) {
838 kill_some_child();
839 sleep(1); /* give it some time to die */
840 check_dead_children();
841 if (live_children >= max_connections) {
842 close(incoming);
843 logerror("Too many children, dropping connection");
844 return;
848 if (addr->sa_family == AF_INET) {
849 char buf[128] = "";
850 struct sockaddr_in *sin_addr = (void *) addr;
851 inet_ntop(addr->sa_family, &sin_addr->sin_addr, buf, sizeof(buf));
852 argv_array_pushf(&cld.env_array, "REMOTE_ADDR=%s", buf);
853 argv_array_pushf(&cld.env_array, "REMOTE_PORT=%d",
854 ntohs(sin_addr->sin_port));
855 #ifndef NO_IPV6
856 } else if (addr->sa_family == AF_INET6) {
857 char buf[128] = "";
858 struct sockaddr_in6 *sin6_addr = (void *) addr;
859 inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(buf));
860 argv_array_pushf(&cld.env_array, "REMOTE_ADDR=[%s]", buf);
861 argv_array_pushf(&cld.env_array, "REMOTE_PORT=%d",
862 ntohs(sin6_addr->sin6_port));
863 #endif
866 cld.argv = cld_argv.argv;
867 cld.in = incoming;
868 cld.out = dup(incoming);
870 if (start_command(&cld))
871 logerror("unable to fork");
872 else
873 add_child(&cld, addr, addrlen);
876 static void child_handler(int signo)
879 * Otherwise empty handler because systemcalls will get interrupted
880 * upon signal receipt
881 * SysV needs the handler to be rearmed
883 signal(SIGCHLD, child_handler);
886 static int set_reuse_addr(int sockfd)
888 int on = 1;
890 if (!reuseaddr)
891 return 0;
892 return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
893 &on, sizeof(on));
896 struct socketlist {
897 int *list;
898 size_t nr;
899 size_t alloc;
902 static const char *ip2str(int family, struct sockaddr *sin, socklen_t len)
904 #ifdef NO_IPV6
905 static char ip[INET_ADDRSTRLEN];
906 #else
907 static char ip[INET6_ADDRSTRLEN];
908 #endif
910 switch (family) {
911 #ifndef NO_IPV6
912 case AF_INET6:
913 inet_ntop(family, &((struct sockaddr_in6*)sin)->sin6_addr, ip, len);
914 break;
915 #endif
916 case AF_INET:
917 inet_ntop(family, &((struct sockaddr_in*)sin)->sin_addr, ip, len);
918 break;
919 default:
920 xsnprintf(ip, sizeof(ip), "<unknown>");
922 return ip;
925 #ifndef NO_IPV6
927 static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
929 int socknum = 0;
930 char pbuf[NI_MAXSERV];
931 struct addrinfo hints, *ai0, *ai;
932 int gai;
933 long flags;
935 xsnprintf(pbuf, sizeof(pbuf), "%d", listen_port);
936 memset(&hints, 0, sizeof(hints));
937 hints.ai_family = AF_UNSPEC;
938 hints.ai_socktype = SOCK_STREAM;
939 hints.ai_protocol = IPPROTO_TCP;
940 hints.ai_flags = AI_PASSIVE;
942 gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0);
943 if (gai) {
944 logerror("getaddrinfo() for %s failed: %s", listen_addr, gai_strerror(gai));
945 return 0;
948 for (ai = ai0; ai; ai = ai->ai_next) {
949 int sockfd;
951 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
952 if (sockfd < 0)
953 continue;
954 if (sockfd >= FD_SETSIZE) {
955 logerror("Socket descriptor too large");
956 close(sockfd);
957 continue;
960 #ifdef IPV6_V6ONLY
961 if (ai->ai_family == AF_INET6) {
962 int on = 1;
963 setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
964 &on, sizeof(on));
965 /* Note: error is not fatal */
967 #endif
969 if (set_reuse_addr(sockfd)) {
970 logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
971 close(sockfd);
972 continue;
975 set_keep_alive(sockfd);
977 if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
978 logerror("Could not bind to %s: %s",
979 ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
980 strerror(errno));
981 close(sockfd);
982 continue; /* not fatal */
984 if (listen(sockfd, 5) < 0) {
985 logerror("Could not listen to %s: %s",
986 ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
987 strerror(errno));
988 close(sockfd);
989 continue; /* not fatal */
992 flags = fcntl(sockfd, F_GETFD, 0);
993 if (flags >= 0)
994 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
996 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
997 socklist->list[socklist->nr++] = sockfd;
998 socknum++;
1001 freeaddrinfo(ai0);
1003 return socknum;
1006 #else /* NO_IPV6 */
1008 static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
1010 struct sockaddr_in sin;
1011 int sockfd;
1012 long flags;
1014 memset(&sin, 0, sizeof sin);
1015 sin.sin_family = AF_INET;
1016 sin.sin_port = htons(listen_port);
1018 if (listen_addr) {
1019 /* Well, host better be an IP address here. */
1020 if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0)
1021 return 0;
1022 } else {
1023 sin.sin_addr.s_addr = htonl(INADDR_ANY);
1026 sockfd = socket(AF_INET, SOCK_STREAM, 0);
1027 if (sockfd < 0)
1028 return 0;
1030 if (set_reuse_addr(sockfd)) {
1031 logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
1032 close(sockfd);
1033 return 0;
1036 set_keep_alive(sockfd);
1038 if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
1039 logerror("Could not bind to %s: %s",
1040 ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
1041 strerror(errno));
1042 close(sockfd);
1043 return 0;
1046 if (listen(sockfd, 5) < 0) {
1047 logerror("Could not listen to %s: %s",
1048 ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
1049 strerror(errno));
1050 close(sockfd);
1051 return 0;
1054 flags = fcntl(sockfd, F_GETFD, 0);
1055 if (flags >= 0)
1056 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
1058 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
1059 socklist->list[socklist->nr++] = sockfd;
1060 return 1;
1063 #endif
1065 static void socksetup(struct string_list *listen_addr, int listen_port, struct socketlist *socklist)
1067 if (!listen_addr->nr)
1068 setup_named_sock(NULL, listen_port, socklist);
1069 else {
1070 int i, socknum;
1071 for (i = 0; i < listen_addr->nr; i++) {
1072 socknum = setup_named_sock(listen_addr->items[i].string,
1073 listen_port, socklist);
1075 if (socknum == 0)
1076 logerror("unable to allocate any listen sockets for host %s on port %u",
1077 listen_addr->items[i].string, listen_port);
1082 static int service_loop(struct socketlist *socklist)
1084 struct pollfd *pfd;
1085 int i;
1087 pfd = xcalloc(socklist->nr, sizeof(struct pollfd));
1089 for (i = 0; i < socklist->nr; i++) {
1090 pfd[i].fd = socklist->list[i];
1091 pfd[i].events = POLLIN;
1094 signal(SIGCHLD, child_handler);
1096 for (;;) {
1097 int i;
1099 check_dead_children();
1101 if (poll(pfd, socklist->nr, -1) < 0) {
1102 if (errno != EINTR) {
1103 logerror("Poll failed, resuming: %s",
1104 strerror(errno));
1105 sleep(1);
1107 continue;
1110 for (i = 0; i < socklist->nr; i++) {
1111 if (pfd[i].revents & POLLIN) {
1112 union {
1113 struct sockaddr sa;
1114 struct sockaddr_in sai;
1115 #ifndef NO_IPV6
1116 struct sockaddr_in6 sai6;
1117 #endif
1118 } ss;
1119 socklen_t sslen = sizeof(ss);
1120 int incoming = accept(pfd[i].fd, &ss.sa, &sslen);
1121 if (incoming < 0) {
1122 switch (errno) {
1123 case EAGAIN:
1124 case EINTR:
1125 case ECONNABORTED:
1126 continue;
1127 default:
1128 die_errno("accept returned");
1131 handle(incoming, &ss.sa, sslen);
1137 #ifdef NO_POSIX_GOODIES
1139 struct credentials;
1141 static void drop_privileges(struct credentials *cred)
1143 /* nothing */
1146 static struct credentials *prepare_credentials(const char *user_name,
1147 const char *group_name)
1149 die("--user not supported on this platform");
1152 #else
1154 struct credentials {
1155 struct passwd *pass;
1156 gid_t gid;
1159 static void drop_privileges(struct credentials *cred)
1161 if (cred && (initgroups(cred->pass->pw_name, cred->gid) ||
1162 setgid (cred->gid) || setuid(cred->pass->pw_uid)))
1163 die("cannot drop privileges");
1166 static struct credentials *prepare_credentials(const char *user_name,
1167 const char *group_name)
1169 static struct credentials c;
1171 c.pass = getpwnam(user_name);
1172 if (!c.pass)
1173 die("user not found - %s", user_name);
1175 if (!group_name)
1176 c.gid = c.pass->pw_gid;
1177 else {
1178 struct group *group = getgrnam(group_name);
1179 if (!group)
1180 die("group not found - %s", group_name);
1182 c.gid = group->gr_gid;
1185 return &c;
1187 #endif
1189 static int serve(struct string_list *listen_addr, int listen_port,
1190 struct credentials *cred)
1192 struct socketlist socklist = { NULL, 0, 0 };
1194 socksetup(listen_addr, listen_port, &socklist);
1195 if (socklist.nr == 0)
1196 die("unable to allocate any listen sockets on port %u",
1197 listen_port);
1199 drop_privileges(cred);
1201 loginfo("Ready to rumble");
1203 return service_loop(&socklist);
1206 int cmd_main(int argc, const char **argv)
1208 int listen_port = 0;
1209 struct string_list listen_addr = STRING_LIST_INIT_NODUP;
1210 int serve_mode = 0, inetd_mode = 0;
1211 const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
1212 int detach = 0;
1213 struct credentials *cred = NULL;
1214 int i;
1216 for (i = 1; i < argc; i++) {
1217 const char *arg = argv[i];
1218 const char *v;
1220 if (skip_prefix(arg, "--listen=", &v)) {
1221 string_list_append(&listen_addr, xstrdup_tolower(v));
1222 continue;
1224 if (skip_prefix(arg, "--port=", &v)) {
1225 char *end;
1226 unsigned long n;
1227 n = strtoul(v, &end, 0);
1228 if (*v && !*end) {
1229 listen_port = n;
1230 continue;
1233 if (!strcmp(arg, "--serve")) {
1234 serve_mode = 1;
1235 continue;
1237 if (!strcmp(arg, "--inetd")) {
1238 inetd_mode = 1;
1239 log_syslog = 1;
1240 continue;
1242 if (!strcmp(arg, "--verbose")) {
1243 verbose = 1;
1244 continue;
1246 if (!strcmp(arg, "--syslog")) {
1247 log_syslog = 1;
1248 continue;
1250 if (!strcmp(arg, "--export-all")) {
1251 export_all_trees = 1;
1252 continue;
1254 if (skip_prefix(arg, "--access-hook=", &v)) {
1255 access_hook = v;
1256 continue;
1258 if (skip_prefix(arg, "--timeout=", &v)) {
1259 timeout = atoi(v);
1260 continue;
1262 if (skip_prefix(arg, "--init-timeout=", &v)) {
1263 init_timeout = atoi(v);
1264 continue;
1266 if (skip_prefix(arg, "--max-connections=", &v)) {
1267 max_connections = atoi(v);
1268 if (max_connections < 0)
1269 max_connections = 0; /* unlimited */
1270 continue;
1272 if (!strcmp(arg, "--strict-paths")) {
1273 strict_paths = 1;
1274 continue;
1276 if (skip_prefix(arg, "--base-path=", &v)) {
1277 base_path = v;
1278 continue;
1280 if (!strcmp(arg, "--base-path-relaxed")) {
1281 base_path_relaxed = 1;
1282 continue;
1284 if (skip_prefix(arg, "--interpolated-path=", &v)) {
1285 interpolated_path = v;
1286 continue;
1288 if (!strcmp(arg, "--reuseaddr")) {
1289 reuseaddr = 1;
1290 continue;
1292 if (!strcmp(arg, "--user-path")) {
1293 user_path = "";
1294 continue;
1296 if (skip_prefix(arg, "--user-path=", &v)) {
1297 user_path = v;
1298 continue;
1300 if (skip_prefix(arg, "--pid-file=", &v)) {
1301 pid_file = v;
1302 continue;
1304 if (!strcmp(arg, "--detach")) {
1305 detach = 1;
1306 log_syslog = 1;
1307 continue;
1309 if (skip_prefix(arg, "--user=", &v)) {
1310 user_name = v;
1311 continue;
1313 if (skip_prefix(arg, "--group=", &v)) {
1314 group_name = v;
1315 continue;
1317 if (skip_prefix(arg, "--enable=", &v)) {
1318 enable_service(v, 1);
1319 continue;
1321 if (skip_prefix(arg, "--disable=", &v)) {
1322 enable_service(v, 0);
1323 continue;
1325 if (skip_prefix(arg, "--allow-override=", &v)) {
1326 make_service_overridable(v, 1);
1327 continue;
1329 if (skip_prefix(arg, "--forbid-override=", &v)) {
1330 make_service_overridable(v, 0);
1331 continue;
1333 if (!strcmp(arg, "--informative-errors")) {
1334 informative_errors = 1;
1335 continue;
1337 if (!strcmp(arg, "--no-informative-errors")) {
1338 informative_errors = 0;
1339 continue;
1341 if (!strcmp(arg, "--")) {
1342 ok_paths = &argv[i+1];
1343 break;
1344 } else if (arg[0] != '-') {
1345 ok_paths = &argv[i];
1346 break;
1349 usage(daemon_usage);
1352 if (log_syslog) {
1353 openlog("git-daemon", LOG_PID, LOG_DAEMON);
1354 set_die_routine(daemon_die);
1355 } else
1356 /* avoid splitting a message in the middle */
1357 setvbuf(stderr, NULL, _IOFBF, 4096);
1359 if (inetd_mode && (detach || group_name || user_name))
1360 die("--detach, --user and --group are incompatible with --inetd");
1362 if (inetd_mode && (listen_port || (listen_addr.nr > 0)))
1363 die("--listen= and --port= are incompatible with --inetd");
1364 else if (listen_port == 0)
1365 listen_port = DEFAULT_GIT_PORT;
1367 if (group_name && !user_name)
1368 die("--group supplied without --user");
1370 if (user_name)
1371 cred = prepare_credentials(user_name, group_name);
1373 if (strict_paths && (!ok_paths || !*ok_paths))
1374 die("option --strict-paths requires a whitelist");
1376 if (base_path && !is_directory(base_path))
1377 die("base-path '%s' does not exist or is not a directory",
1378 base_path);
1380 if (inetd_mode) {
1381 if (!freopen("/dev/null", "w", stderr))
1382 die_errno("failed to redirect stderr to /dev/null");
1385 if (inetd_mode || serve_mode)
1386 return execute();
1388 if (detach) {
1389 if (daemonize())
1390 die("--detach not supported on this platform");
1393 if (pid_file)
1394 write_file(pid_file, "%"PRIuMAX, (uintmax_t) getpid());
1396 /* prepare argv for serving-processes */
1397 argv_array_push(&cld_argv, argv[0]); /* git-daemon */
1398 argv_array_push(&cld_argv, "--serve");
1399 for (i = 1; i < argc; ++i)
1400 argv_array_push(&cld_argv, argv[i]);
1402 return serve(&listen_addr, listen_port, cred);