Merge branch 'rs/mailinfo-lib'
[alt-git.git] / daemon.c
blob425aad0507f48ca07b11faa05828ea841bdd302f
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 const char *path;
164 const char *dir;
166 dir = directory;
168 if (daemon_avoid_alias(dir)) {
169 logerror("'%s': aliased", dir);
170 return NULL;
173 if (*dir == '~') {
174 if (!user_path) {
175 logerror("'%s': User-path not allowed", dir);
176 return NULL;
178 if (*user_path) {
179 /* Got either "~alice" or "~alice/foo";
180 * rewrite them to "~alice/%s" or
181 * "~alice/%s/foo".
183 int namlen, restlen = strlen(dir);
184 const char *slash = strchr(dir, '/');
185 if (!slash)
186 slash = dir + restlen;
187 namlen = slash - dir;
188 restlen -= namlen;
189 loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
190 snprintf(rpath, PATH_MAX, "%.*s/%s%.*s",
191 namlen, dir, user_path, restlen, slash);
192 dir = rpath;
195 else if (interpolated_path && hi->saw_extended_args) {
196 struct strbuf expanded_path = STRBUF_INIT;
197 struct expand_path_context context;
199 context.directory = directory;
200 context.hostinfo = hi;
202 if (*dir != '/') {
203 /* Allow only absolute */
204 logerror("'%s': Non-absolute path denied (interpolated-path active)", dir);
205 return NULL;
208 strbuf_expand(&expanded_path, interpolated_path,
209 expand_path, &context);
210 strlcpy(interp_path, expanded_path.buf, PATH_MAX);
211 strbuf_release(&expanded_path);
212 loginfo("Interpolated dir '%s'", interp_path);
214 dir = interp_path;
216 else if (base_path) {
217 if (*dir != '/') {
218 /* Allow only absolute */
219 logerror("'%s': Non-absolute path denied (base-path active)", dir);
220 return NULL;
222 snprintf(rpath, PATH_MAX, "%s%s", base_path, dir);
223 dir = rpath;
226 path = enter_repo(dir, strict_paths);
227 if (!path && base_path && base_path_relaxed) {
229 * if we fail and base_path_relaxed is enabled, try without
230 * prefixing the base path
232 dir = directory;
233 path = enter_repo(dir, strict_paths);
236 if (!path) {
237 logerror("'%s' does not appear to be a git repository", dir);
238 return NULL;
241 if ( ok_paths && *ok_paths ) {
242 const char **pp;
243 int pathlen = strlen(path);
245 /* The validation is done on the paths after enter_repo
246 * appends optional {.git,.git/.git} and friends, but
247 * it does not use getcwd(). So if your /pub is
248 * a symlink to /mnt/pub, you can whitelist /pub and
249 * do not have to say /mnt/pub.
250 * Do not say /pub/.
252 for ( pp = ok_paths ; *pp ; pp++ ) {
253 int len = strlen(*pp);
254 if (len <= pathlen &&
255 !memcmp(*pp, path, len) &&
256 (path[len] == '\0' ||
257 (!strict_paths && path[len] == '/')))
258 return path;
261 else {
262 /* be backwards compatible */
263 if (!strict_paths)
264 return path;
267 logerror("'%s': not in whitelist", path);
268 return NULL; /* Fallthrough. Deny by default */
271 typedef int (*daemon_service_fn)(void);
272 struct daemon_service {
273 const char *name;
274 const char *config_name;
275 daemon_service_fn fn;
276 int enabled;
277 int overridable;
280 static int daemon_error(const char *dir, const char *msg)
282 if (!informative_errors)
283 msg = "access denied or repository not exported";
284 packet_write(1, "ERR %s: %s", msg, dir);
285 return -1;
288 static const char *access_hook;
290 static int run_access_hook(struct daemon_service *service, const char *dir,
291 const char *path, struct hostinfo *hi)
293 struct child_process child = CHILD_PROCESS_INIT;
294 struct strbuf buf = STRBUF_INIT;
295 const char *argv[8];
296 const char **arg = argv;
297 char *eol;
298 int seen_errors = 0;
300 *arg++ = access_hook;
301 *arg++ = service->name;
302 *arg++ = path;
303 *arg++ = hi->hostname.buf;
304 *arg++ = get_canon_hostname(hi);
305 *arg++ = get_ip_address(hi);
306 *arg++ = hi->tcp_port.buf;
307 *arg = NULL;
309 child.use_shell = 1;
310 child.argv = argv;
311 child.no_stdin = 1;
312 child.no_stderr = 1;
313 child.out = -1;
314 if (start_command(&child)) {
315 logerror("daemon access hook '%s' failed to start",
316 access_hook);
317 goto error_return;
319 if (strbuf_read(&buf, child.out, 0) < 0) {
320 logerror("failed to read from pipe to daemon access hook '%s'",
321 access_hook);
322 strbuf_reset(&buf);
323 seen_errors = 1;
325 if (close(child.out) < 0) {
326 logerror("failed to close pipe to daemon access hook '%s'",
327 access_hook);
328 seen_errors = 1;
330 if (finish_command(&child))
331 seen_errors = 1;
333 if (!seen_errors) {
334 strbuf_release(&buf);
335 return 0;
338 error_return:
339 strbuf_ltrim(&buf);
340 if (!buf.len)
341 strbuf_addstr(&buf, "service rejected");
342 eol = strchr(buf.buf, '\n');
343 if (eol)
344 *eol = '\0';
345 errno = EACCES;
346 daemon_error(dir, buf.buf);
347 strbuf_release(&buf);
348 return -1;
351 static int run_service(const char *dir, struct daemon_service *service,
352 struct hostinfo *hi)
354 const char *path;
355 int enabled = service->enabled;
356 struct strbuf var = STRBUF_INIT;
358 loginfo("Request %s for '%s'", service->name, dir);
360 if (!enabled && !service->overridable) {
361 logerror("'%s': service not enabled.", service->name);
362 errno = EACCES;
363 return daemon_error(dir, "service not enabled");
366 if (!(path = path_ok(dir, hi)))
367 return daemon_error(dir, "no such repository");
370 * Security on the cheap.
372 * We want a readable HEAD, usable "objects" directory, and
373 * a "git-daemon-export-ok" flag that says that the other side
374 * is ok with us doing this.
376 * path_ok() uses enter_repo() and does whitelist checking.
377 * We only need to make sure the repository is exported.
380 if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
381 logerror("'%s': repository not exported.", path);
382 errno = EACCES;
383 return daemon_error(dir, "repository not exported");
386 if (service->overridable) {
387 strbuf_addf(&var, "daemon.%s", service->config_name);
388 git_config_get_bool(var.buf, &enabled);
389 strbuf_release(&var);
391 if (!enabled) {
392 logerror("'%s': service not enabled for '%s'",
393 service->name, path);
394 errno = EACCES;
395 return daemon_error(dir, "service not enabled");
399 * Optionally, a hook can choose to deny access to the
400 * repository depending on the phase of the moon.
402 if (access_hook && run_access_hook(service, dir, path, hi))
403 return -1;
406 * We'll ignore SIGTERM from now on, we have a
407 * good client.
409 signal(SIGTERM, SIG_IGN);
411 return service->fn();
414 static void copy_to_log(int fd)
416 struct strbuf line = STRBUF_INIT;
417 FILE *fp;
419 fp = fdopen(fd, "r");
420 if (fp == NULL) {
421 logerror("fdopen of error channel failed");
422 close(fd);
423 return;
426 while (strbuf_getline_lf(&line, fp) != EOF) {
427 logerror("%s", line.buf);
428 strbuf_setlen(&line, 0);
431 strbuf_release(&line);
432 fclose(fp);
435 static int run_service_command(const char **argv)
437 struct child_process cld = CHILD_PROCESS_INIT;
439 cld.argv = argv;
440 cld.git_cmd = 1;
441 cld.err = -1;
442 if (start_command(&cld))
443 return -1;
445 close(0);
446 close(1);
448 copy_to_log(cld.err);
450 return finish_command(&cld);
453 static int upload_pack(void)
455 /* Timeout as string */
456 char timeout_buf[64];
457 const char *argv[] = { "upload-pack", "--strict", NULL, ".", NULL };
459 argv[2] = timeout_buf;
461 snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout);
462 return run_service_command(argv);
465 static int upload_archive(void)
467 static const char *argv[] = { "upload-archive", ".", NULL };
468 return run_service_command(argv);
471 static int receive_pack(void)
473 static const char *argv[] = { "receive-pack", ".", NULL };
474 return run_service_command(argv);
477 static struct daemon_service daemon_service[] = {
478 { "upload-archive", "uploadarch", upload_archive, 0, 1 },
479 { "upload-pack", "uploadpack", upload_pack, 1, 1 },
480 { "receive-pack", "receivepack", receive_pack, 0, 1 },
483 static void enable_service(const char *name, int ena)
485 int i;
486 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
487 if (!strcmp(daemon_service[i].name, name)) {
488 daemon_service[i].enabled = ena;
489 return;
492 die("No such service %s", name);
495 static void make_service_overridable(const char *name, int ena)
497 int i;
498 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
499 if (!strcmp(daemon_service[i].name, name)) {
500 daemon_service[i].overridable = ena;
501 return;
504 die("No such service %s", name);
507 static void parse_host_and_port(char *hostport, char **host,
508 char **port)
510 if (*hostport == '[') {
511 char *end;
513 end = strchr(hostport, ']');
514 if (!end)
515 die("Invalid request ('[' without ']')");
516 *end = '\0';
517 *host = hostport + 1;
518 if (!end[1])
519 *port = NULL;
520 else if (end[1] == ':')
521 *port = end + 2;
522 else
523 die("Garbage after end of host part");
524 } else {
525 *host = hostport;
526 *port = strrchr(hostport, ':');
527 if (*port) {
528 **port = '\0';
529 ++*port;
535 * Sanitize a string from the client so that it's OK to be inserted into a
536 * filesystem path. Specifically, we disallow slashes, runs of "..", and
537 * trailing and leading dots, which means that the client cannot escape
538 * our base path via ".." traversal.
540 static void sanitize_client(struct strbuf *out, const char *in)
542 for (; *in; in++) {
543 if (*in == '/')
544 continue;
545 if (*in == '.' && (!out->len || out->buf[out->len - 1] == '.'))
546 continue;
547 strbuf_addch(out, *in);
550 while (out->len && out->buf[out->len - 1] == '.')
551 strbuf_setlen(out, out->len - 1);
555 * Like sanitize_client, but we also perform any canonicalization
556 * to make life easier on the admin.
558 static void canonicalize_client(struct strbuf *out, const char *in)
560 sanitize_client(out, in);
561 strbuf_tolower(out);
565 * Read the host as supplied by the client connection.
567 static void parse_host_arg(struct hostinfo *hi, char *extra_args, int buflen)
569 char *val;
570 int vallen;
571 char *end = extra_args + buflen;
573 if (extra_args < end && *extra_args) {
574 hi->saw_extended_args = 1;
575 if (strncasecmp("host=", extra_args, 5) == 0) {
576 val = extra_args + 5;
577 vallen = strlen(val) + 1;
578 if (*val) {
579 /* Split <host>:<port> at colon. */
580 char *host;
581 char *port;
582 parse_host_and_port(val, &host, &port);
583 if (port)
584 sanitize_client(&hi->tcp_port, port);
585 canonicalize_client(&hi->hostname, host);
586 hi->hostname_lookup_done = 0;
589 /* On to the next one */
590 extra_args = val + vallen;
592 if (extra_args < end && *extra_args)
593 die("Invalid request");
598 * Locate canonical hostname and its IP address.
600 static void lookup_hostname(struct hostinfo *hi)
602 if (!hi->hostname_lookup_done && hi->hostname.len) {
603 #ifndef NO_IPV6
604 struct addrinfo hints;
605 struct addrinfo *ai;
606 int gai;
607 static char addrbuf[HOST_NAME_MAX + 1];
609 memset(&hints, 0, sizeof(hints));
610 hints.ai_flags = AI_CANONNAME;
612 gai = getaddrinfo(hi->hostname.buf, NULL, &hints, &ai);
613 if (!gai) {
614 struct sockaddr_in *sin_addr = (void *)ai->ai_addr;
616 inet_ntop(AF_INET, &sin_addr->sin_addr,
617 addrbuf, sizeof(addrbuf));
618 strbuf_addstr(&hi->ip_address, addrbuf);
620 if (ai->ai_canonname)
621 sanitize_client(&hi->canon_hostname,
622 ai->ai_canonname);
623 else
624 strbuf_addbuf(&hi->canon_hostname,
625 &hi->ip_address);
627 freeaddrinfo(ai);
629 #else
630 struct hostent *hent;
631 struct sockaddr_in sa;
632 char **ap;
633 static char addrbuf[HOST_NAME_MAX + 1];
635 hent = gethostbyname(hi->hostname.buf);
636 if (hent) {
637 ap = hent->h_addr_list;
638 memset(&sa, 0, sizeof sa);
639 sa.sin_family = hent->h_addrtype;
640 sa.sin_port = htons(0);
641 memcpy(&sa.sin_addr, *ap, hent->h_length);
643 inet_ntop(hent->h_addrtype, &sa.sin_addr,
644 addrbuf, sizeof(addrbuf));
646 sanitize_client(&hi->canon_hostname, hent->h_name);
647 strbuf_addstr(&hi->ip_address, addrbuf);
649 #endif
650 hi->hostname_lookup_done = 1;
654 static void hostinfo_init(struct hostinfo *hi)
656 memset(hi, 0, sizeof(*hi));
657 strbuf_init(&hi->hostname, 0);
658 strbuf_init(&hi->canon_hostname, 0);
659 strbuf_init(&hi->ip_address, 0);
660 strbuf_init(&hi->tcp_port, 0);
663 static void hostinfo_clear(struct hostinfo *hi)
665 strbuf_release(&hi->hostname);
666 strbuf_release(&hi->canon_hostname);
667 strbuf_release(&hi->ip_address);
668 strbuf_release(&hi->tcp_port);
671 static void set_keep_alive(int sockfd)
673 int ka = 1;
675 if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0) {
676 if (errno != ENOTSOCK)
677 logerror("unable to set SO_KEEPALIVE on socket: %s",
678 strerror(errno));
682 static int execute(void)
684 char *line = packet_buffer;
685 int pktlen, len, i;
686 char *addr = getenv("REMOTE_ADDR"), *port = getenv("REMOTE_PORT");
687 struct hostinfo hi;
689 hostinfo_init(&hi);
691 if (addr)
692 loginfo("Connection from %s:%s", addr, port);
694 set_keep_alive(0);
695 alarm(init_timeout ? init_timeout : timeout);
696 pktlen = packet_read(0, NULL, NULL, packet_buffer, sizeof(packet_buffer), 0);
697 alarm(0);
699 len = strlen(line);
700 if (pktlen != len)
701 loginfo("Extended attributes (%d bytes) exist <%.*s>",
702 (int) pktlen - len,
703 (int) pktlen - len, line + len + 1);
704 if (len && line[len-1] == '\n') {
705 line[--len] = 0;
706 pktlen--;
709 if (len != pktlen)
710 parse_host_arg(&hi, line + len + 1, pktlen - len - 1);
712 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
713 struct daemon_service *s = &(daemon_service[i]);
714 const char *arg;
716 if (skip_prefix(line, "git-", &arg) &&
717 skip_prefix(arg, s->name, &arg) &&
718 *arg++ == ' ') {
720 * Note: The directory here is probably context sensitive,
721 * and might depend on the actual service being performed.
723 int rc = run_service(arg, s, &hi);
724 hostinfo_clear(&hi);
725 return rc;
729 hostinfo_clear(&hi);
730 logerror("Protocol error: '%s'", line);
731 return -1;
734 static int addrcmp(const struct sockaddr_storage *s1,
735 const struct sockaddr_storage *s2)
737 const struct sockaddr *sa1 = (const struct sockaddr*) s1;
738 const struct sockaddr *sa2 = (const struct sockaddr*) s2;
740 if (sa1->sa_family != sa2->sa_family)
741 return sa1->sa_family - sa2->sa_family;
742 if (sa1->sa_family == AF_INET)
743 return memcmp(&((struct sockaddr_in *)s1)->sin_addr,
744 &((struct sockaddr_in *)s2)->sin_addr,
745 sizeof(struct in_addr));
746 #ifndef NO_IPV6
747 if (sa1->sa_family == AF_INET6)
748 return memcmp(&((struct sockaddr_in6 *)s1)->sin6_addr,
749 &((struct sockaddr_in6 *)s2)->sin6_addr,
750 sizeof(struct in6_addr));
751 #endif
752 return 0;
755 static int max_connections = 32;
757 static unsigned int live_children;
759 static struct child {
760 struct child *next;
761 struct child_process cld;
762 struct sockaddr_storage address;
763 } *firstborn;
765 static void add_child(struct child_process *cld, struct sockaddr *addr, socklen_t addrlen)
767 struct child *newborn, **cradle;
769 newborn = xcalloc(1, sizeof(*newborn));
770 live_children++;
771 memcpy(&newborn->cld, cld, sizeof(*cld));
772 memcpy(&newborn->address, addr, addrlen);
773 for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next)
774 if (!addrcmp(&(*cradle)->address, &newborn->address))
775 break;
776 newborn->next = *cradle;
777 *cradle = newborn;
781 * This gets called if the number of connections grows
782 * past "max_connections".
784 * We kill the newest connection from a duplicate IP.
786 static void kill_some_child(void)
788 const struct child *blanket, *next;
790 if (!(blanket = firstborn))
791 return;
793 for (; (next = blanket->next); blanket = next)
794 if (!addrcmp(&blanket->address, &next->address)) {
795 kill(blanket->cld.pid, SIGTERM);
796 break;
800 static void check_dead_children(void)
802 int status;
803 pid_t pid;
805 struct child **cradle, *blanket;
806 for (cradle = &firstborn; (blanket = *cradle);)
807 if ((pid = waitpid(blanket->cld.pid, &status, WNOHANG)) > 1) {
808 const char *dead = "";
809 if (status)
810 dead = " (with error)";
811 loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead);
813 /* remove the child */
814 *cradle = blanket->next;
815 live_children--;
816 child_process_clear(&blanket->cld);
817 free(blanket);
818 } else
819 cradle = &blanket->next;
822 static struct argv_array cld_argv = ARGV_ARRAY_INIT;
823 static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen)
825 struct child_process cld = CHILD_PROCESS_INIT;
827 if (max_connections && live_children >= max_connections) {
828 kill_some_child();
829 sleep(1); /* give it some time to die */
830 check_dead_children();
831 if (live_children >= max_connections) {
832 close(incoming);
833 logerror("Too many children, dropping connection");
834 return;
838 if (addr->sa_family == AF_INET) {
839 char buf[128] = "";
840 struct sockaddr_in *sin_addr = (void *) addr;
841 inet_ntop(addr->sa_family, &sin_addr->sin_addr, buf, sizeof(buf));
842 argv_array_pushf(&cld.env_array, "REMOTE_ADDR=%s", buf);
843 argv_array_pushf(&cld.env_array, "REMOTE_PORT=%d",
844 ntohs(sin_addr->sin_port));
845 #ifndef NO_IPV6
846 } else if (addr->sa_family == AF_INET6) {
847 char buf[128] = "";
848 struct sockaddr_in6 *sin6_addr = (void *) addr;
849 inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(buf));
850 argv_array_pushf(&cld.env_array, "REMOTE_ADDR=[%s]", buf);
851 argv_array_pushf(&cld.env_array, "REMOTE_PORT=%d",
852 ntohs(sin6_addr->sin6_port));
853 #endif
856 cld.argv = cld_argv.argv;
857 cld.in = incoming;
858 cld.out = dup(incoming);
860 if (start_command(&cld))
861 logerror("unable to fork");
862 else
863 add_child(&cld, addr, addrlen);
866 static void child_handler(int signo)
869 * Otherwise empty handler because systemcalls will get interrupted
870 * upon signal receipt
871 * SysV needs the handler to be rearmed
873 signal(SIGCHLD, child_handler);
876 static int set_reuse_addr(int sockfd)
878 int on = 1;
880 if (!reuseaddr)
881 return 0;
882 return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
883 &on, sizeof(on));
886 struct socketlist {
887 int *list;
888 size_t nr;
889 size_t alloc;
892 static const char *ip2str(int family, struct sockaddr *sin, socklen_t len)
894 #ifdef NO_IPV6
895 static char ip[INET_ADDRSTRLEN];
896 #else
897 static char ip[INET6_ADDRSTRLEN];
898 #endif
900 switch (family) {
901 #ifndef NO_IPV6
902 case AF_INET6:
903 inet_ntop(family, &((struct sockaddr_in6*)sin)->sin6_addr, ip, len);
904 break;
905 #endif
906 case AF_INET:
907 inet_ntop(family, &((struct sockaddr_in*)sin)->sin_addr, ip, len);
908 break;
909 default:
910 xsnprintf(ip, sizeof(ip), "<unknown>");
912 return ip;
915 #ifndef NO_IPV6
917 static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
919 int socknum = 0;
920 char pbuf[NI_MAXSERV];
921 struct addrinfo hints, *ai0, *ai;
922 int gai;
923 long flags;
925 xsnprintf(pbuf, sizeof(pbuf), "%d", listen_port);
926 memset(&hints, 0, sizeof(hints));
927 hints.ai_family = AF_UNSPEC;
928 hints.ai_socktype = SOCK_STREAM;
929 hints.ai_protocol = IPPROTO_TCP;
930 hints.ai_flags = AI_PASSIVE;
932 gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0);
933 if (gai) {
934 logerror("getaddrinfo() for %s failed: %s", listen_addr, gai_strerror(gai));
935 return 0;
938 for (ai = ai0; ai; ai = ai->ai_next) {
939 int sockfd;
941 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
942 if (sockfd < 0)
943 continue;
944 if (sockfd >= FD_SETSIZE) {
945 logerror("Socket descriptor too large");
946 close(sockfd);
947 continue;
950 #ifdef IPV6_V6ONLY
951 if (ai->ai_family == AF_INET6) {
952 int on = 1;
953 setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
954 &on, sizeof(on));
955 /* Note: error is not fatal */
957 #endif
959 if (set_reuse_addr(sockfd)) {
960 logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
961 close(sockfd);
962 continue;
965 set_keep_alive(sockfd);
967 if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
968 logerror("Could not bind to %s: %s",
969 ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
970 strerror(errno));
971 close(sockfd);
972 continue; /* not fatal */
974 if (listen(sockfd, 5) < 0) {
975 logerror("Could not listen to %s: %s",
976 ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
977 strerror(errno));
978 close(sockfd);
979 continue; /* not fatal */
982 flags = fcntl(sockfd, F_GETFD, 0);
983 if (flags >= 0)
984 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
986 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
987 socklist->list[socklist->nr++] = sockfd;
988 socknum++;
991 freeaddrinfo(ai0);
993 return socknum;
996 #else /* NO_IPV6 */
998 static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
1000 struct sockaddr_in sin;
1001 int sockfd;
1002 long flags;
1004 memset(&sin, 0, sizeof sin);
1005 sin.sin_family = AF_INET;
1006 sin.sin_port = htons(listen_port);
1008 if (listen_addr) {
1009 /* Well, host better be an IP address here. */
1010 if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0)
1011 return 0;
1012 } else {
1013 sin.sin_addr.s_addr = htonl(INADDR_ANY);
1016 sockfd = socket(AF_INET, SOCK_STREAM, 0);
1017 if (sockfd < 0)
1018 return 0;
1020 if (set_reuse_addr(sockfd)) {
1021 logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
1022 close(sockfd);
1023 return 0;
1026 set_keep_alive(sockfd);
1028 if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
1029 logerror("Could not bind to %s: %s",
1030 ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
1031 strerror(errno));
1032 close(sockfd);
1033 return 0;
1036 if (listen(sockfd, 5) < 0) {
1037 logerror("Could not listen to %s: %s",
1038 ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
1039 strerror(errno));
1040 close(sockfd);
1041 return 0;
1044 flags = fcntl(sockfd, F_GETFD, 0);
1045 if (flags >= 0)
1046 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
1048 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
1049 socklist->list[socklist->nr++] = sockfd;
1050 return 1;
1053 #endif
1055 static void socksetup(struct string_list *listen_addr, int listen_port, struct socketlist *socklist)
1057 if (!listen_addr->nr)
1058 setup_named_sock(NULL, listen_port, socklist);
1059 else {
1060 int i, socknum;
1061 for (i = 0; i < listen_addr->nr; i++) {
1062 socknum = setup_named_sock(listen_addr->items[i].string,
1063 listen_port, socklist);
1065 if (socknum == 0)
1066 logerror("unable to allocate any listen sockets for host %s on port %u",
1067 listen_addr->items[i].string, listen_port);
1072 static int service_loop(struct socketlist *socklist)
1074 struct pollfd *pfd;
1075 int i;
1077 pfd = xcalloc(socklist->nr, sizeof(struct pollfd));
1079 for (i = 0; i < socklist->nr; i++) {
1080 pfd[i].fd = socklist->list[i];
1081 pfd[i].events = POLLIN;
1084 signal(SIGCHLD, child_handler);
1086 for (;;) {
1087 int i;
1089 check_dead_children();
1091 if (poll(pfd, socklist->nr, -1) < 0) {
1092 if (errno != EINTR) {
1093 logerror("Poll failed, resuming: %s",
1094 strerror(errno));
1095 sleep(1);
1097 continue;
1100 for (i = 0; i < socklist->nr; i++) {
1101 if (pfd[i].revents & POLLIN) {
1102 union {
1103 struct sockaddr sa;
1104 struct sockaddr_in sai;
1105 #ifndef NO_IPV6
1106 struct sockaddr_in6 sai6;
1107 #endif
1108 } ss;
1109 socklen_t sslen = sizeof(ss);
1110 int incoming = accept(pfd[i].fd, &ss.sa, &sslen);
1111 if (incoming < 0) {
1112 switch (errno) {
1113 case EAGAIN:
1114 case EINTR:
1115 case ECONNABORTED:
1116 continue;
1117 default:
1118 die_errno("accept returned");
1121 handle(incoming, &ss.sa, sslen);
1127 #ifdef NO_POSIX_GOODIES
1129 struct credentials;
1131 static void drop_privileges(struct credentials *cred)
1133 /* nothing */
1136 static struct credentials *prepare_credentials(const char *user_name,
1137 const char *group_name)
1139 die("--user not supported on this platform");
1142 #else
1144 struct credentials {
1145 struct passwd *pass;
1146 gid_t gid;
1149 static void drop_privileges(struct credentials *cred)
1151 if (cred && (initgroups(cred->pass->pw_name, cred->gid) ||
1152 setgid (cred->gid) || setuid(cred->pass->pw_uid)))
1153 die("cannot drop privileges");
1156 static struct credentials *prepare_credentials(const char *user_name,
1157 const char *group_name)
1159 static struct credentials c;
1161 c.pass = getpwnam(user_name);
1162 if (!c.pass)
1163 die("user not found - %s", user_name);
1165 if (!group_name)
1166 c.gid = c.pass->pw_gid;
1167 else {
1168 struct group *group = getgrnam(group_name);
1169 if (!group)
1170 die("group not found - %s", group_name);
1172 c.gid = group->gr_gid;
1175 return &c;
1177 #endif
1179 static int serve(struct string_list *listen_addr, int listen_port,
1180 struct credentials *cred)
1182 struct socketlist socklist = { NULL, 0, 0 };
1184 socksetup(listen_addr, listen_port, &socklist);
1185 if (socklist.nr == 0)
1186 die("unable to allocate any listen sockets on port %u",
1187 listen_port);
1189 drop_privileges(cred);
1191 loginfo("Ready to rumble");
1193 return service_loop(&socklist);
1196 int cmd_main(int argc, const char **argv)
1198 int listen_port = 0;
1199 struct string_list listen_addr = STRING_LIST_INIT_NODUP;
1200 int serve_mode = 0, inetd_mode = 0;
1201 const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
1202 int detach = 0;
1203 struct credentials *cred = NULL;
1204 int i;
1206 for (i = 1; i < argc; i++) {
1207 const char *arg = argv[i];
1208 const char *v;
1210 if (skip_prefix(arg, "--listen=", &v)) {
1211 string_list_append(&listen_addr, xstrdup_tolower(v));
1212 continue;
1214 if (skip_prefix(arg, "--port=", &v)) {
1215 char *end;
1216 unsigned long n;
1217 n = strtoul(v, &end, 0);
1218 if (*v && !*end) {
1219 listen_port = n;
1220 continue;
1223 if (!strcmp(arg, "--serve")) {
1224 serve_mode = 1;
1225 continue;
1227 if (!strcmp(arg, "--inetd")) {
1228 inetd_mode = 1;
1229 log_syslog = 1;
1230 continue;
1232 if (!strcmp(arg, "--verbose")) {
1233 verbose = 1;
1234 continue;
1236 if (!strcmp(arg, "--syslog")) {
1237 log_syslog = 1;
1238 continue;
1240 if (!strcmp(arg, "--export-all")) {
1241 export_all_trees = 1;
1242 continue;
1244 if (skip_prefix(arg, "--access-hook=", &v)) {
1245 access_hook = v;
1246 continue;
1248 if (skip_prefix(arg, "--timeout=", &v)) {
1249 timeout = atoi(v);
1250 continue;
1252 if (skip_prefix(arg, "--init-timeout=", &v)) {
1253 init_timeout = atoi(v);
1254 continue;
1256 if (skip_prefix(arg, "--max-connections=", &v)) {
1257 max_connections = atoi(v);
1258 if (max_connections < 0)
1259 max_connections = 0; /* unlimited */
1260 continue;
1262 if (!strcmp(arg, "--strict-paths")) {
1263 strict_paths = 1;
1264 continue;
1266 if (skip_prefix(arg, "--base-path=", &v)) {
1267 base_path = v;
1268 continue;
1270 if (!strcmp(arg, "--base-path-relaxed")) {
1271 base_path_relaxed = 1;
1272 continue;
1274 if (skip_prefix(arg, "--interpolated-path=", &v)) {
1275 interpolated_path = v;
1276 continue;
1278 if (!strcmp(arg, "--reuseaddr")) {
1279 reuseaddr = 1;
1280 continue;
1282 if (!strcmp(arg, "--user-path")) {
1283 user_path = "";
1284 continue;
1286 if (skip_prefix(arg, "--user-path=", &v)) {
1287 user_path = v;
1288 continue;
1290 if (skip_prefix(arg, "--pid-file=", &v)) {
1291 pid_file = v;
1292 continue;
1294 if (!strcmp(arg, "--detach")) {
1295 detach = 1;
1296 log_syslog = 1;
1297 continue;
1299 if (skip_prefix(arg, "--user=", &v)) {
1300 user_name = v;
1301 continue;
1303 if (skip_prefix(arg, "--group=", &v)) {
1304 group_name = v;
1305 continue;
1307 if (skip_prefix(arg, "--enable=", &v)) {
1308 enable_service(v, 1);
1309 continue;
1311 if (skip_prefix(arg, "--disable=", &v)) {
1312 enable_service(v, 0);
1313 continue;
1315 if (skip_prefix(arg, "--allow-override=", &v)) {
1316 make_service_overridable(v, 1);
1317 continue;
1319 if (skip_prefix(arg, "--forbid-override=", &v)) {
1320 make_service_overridable(v, 0);
1321 continue;
1323 if (!strcmp(arg, "--informative-errors")) {
1324 informative_errors = 1;
1325 continue;
1327 if (!strcmp(arg, "--no-informative-errors")) {
1328 informative_errors = 0;
1329 continue;
1331 if (!strcmp(arg, "--")) {
1332 ok_paths = &argv[i+1];
1333 break;
1334 } else if (arg[0] != '-') {
1335 ok_paths = &argv[i];
1336 break;
1339 usage(daemon_usage);
1342 if (log_syslog) {
1343 openlog("git-daemon", LOG_PID, LOG_DAEMON);
1344 set_die_routine(daemon_die);
1345 } else
1346 /* avoid splitting a message in the middle */
1347 setvbuf(stderr, NULL, _IOFBF, 4096);
1349 if (inetd_mode && (detach || group_name || user_name))
1350 die("--detach, --user and --group are incompatible with --inetd");
1352 if (inetd_mode && (listen_port || (listen_addr.nr > 0)))
1353 die("--listen= and --port= are incompatible with --inetd");
1354 else if (listen_port == 0)
1355 listen_port = DEFAULT_GIT_PORT;
1357 if (group_name && !user_name)
1358 die("--group supplied without --user");
1360 if (user_name)
1361 cred = prepare_credentials(user_name, group_name);
1363 if (strict_paths && (!ok_paths || !*ok_paths))
1364 die("option --strict-paths requires a whitelist");
1366 if (base_path && !is_directory(base_path))
1367 die("base-path '%s' does not exist or is not a directory",
1368 base_path);
1370 if (inetd_mode) {
1371 if (!freopen("/dev/null", "w", stderr))
1372 die_errno("failed to redirect stderr to /dev/null");
1375 if (inetd_mode || serve_mode)
1376 return execute();
1378 if (detach) {
1379 if (daemonize())
1380 die("--detach not supported on this platform");
1383 if (pid_file)
1384 write_file(pid_file, "%"PRIuMAX, (uintmax_t) getpid());
1386 /* prepare argv for serving-processes */
1387 argv_array_push(&cld_argv, argv[0]); /* git-daemon */
1388 argv_array_push(&cld_argv, "--serve");
1389 for (i = 1; i < argc; ++i)
1390 argv_array_push(&cld_argv, argv[i]);
1392 return serve(&listen_addr, listen_port, cred);