fbf61ca4d59e73ed918bc5a23b56b6c9f2d3751e
1#include "cache.h"
2#include "pkt-line.h"
3#include "exec_cmd.h"
4#include <syslog.h>
6#ifndef HOST_NAME_MAX
8#define HOST_NAME_MAX 256
9#endif
10#ifndef NI_MAXSERV
12#define NI_MAXSERV 32
13#endif
14static int log_syslog;
16static int verbose;
17static int reuseaddr;
18static const char daemon_usage[] =
20"git daemon [--verbose] [--syslog] [--export-all]\n"
21" [--timeout=n] [--init-timeout=n] [--max-connections=n]\n"
22" [--strict-paths] [--base-path=path] [--base-path-relaxed]\n"
23" [--user-path | --user-path=path]\n"
24" [--interpolated-path=path]\n"
25" [--reuseaddr] [--detach] [--pid-file=file]\n"
26" [--[enable|disable|allow-override|forbid-override]=service]\n"
27" [--inetd | [--listen=host_or_ipaddr] [--port=n]\n"
28" [--user=user [--group=group]]\n"
29" [directory...]";
30/* List of acceptable pathname prefixes */
32static char **ok_paths;
33static int strict_paths;
34/* If this is set, git-daemon-export-ok is not required */
36static int export_all_trees;
37/* Take all paths relative to this one if non-NULL */
39static char *base_path;
40static char *interpolated_path;
41static int base_path_relaxed;
42/* Flag indicating client sent extra args. */
44static int saw_extended_args;
45/* If defined, ~user notation is allowed and the string is inserted
47 * after ~user/. E.g. a request to git://host/~alice/frotz would
48 * go to /home/alice/pub_git/frotz with --user-path=pub_git.
49 */
50static const char *user_path;
51/* Timeout, and initial timeout */
53static unsigned int timeout;
54static unsigned int init_timeout;
55static char *hostname;
57static char *canon_hostname;
58static char *ip_address;
59static char *tcp_port;
60static char *directory;
61static void logreport(int priority, const char *err, va_list params)
63{
64 if (log_syslog) {
65 char buf[1024];
66 vsnprintf(buf, sizeof(buf), err, params);
67 syslog(priority, "%s", buf);
68 } else {
69 /*
70 * Since stderr is set to linebuffered mode, the
71 * logging of different processes will not overlap
72 */
73 fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid());
74 vfprintf(stderr, err, params);
75 fputc('\n', stderr);
76 }
77}
78static void logerror(const char *err, ...)
80{
81 va_list params;
82 va_start(params, err);
83 logreport(LOG_ERR, err, params);
84 va_end(params);
85}
86static void loginfo(const char *err, ...)
88{
89 va_list params;
90 if (!verbose)
91 return;
92 va_start(params, err);
93 logreport(LOG_INFO, err, params);
94 va_end(params);
95}
96static void NORETURN daemon_die(const char *err, va_list params)
98{
99 logreport(LOG_ERR, err, params);
100 exit(1);
101}
102static int avoid_alias(char *p)
104{
105 int sl, ndot;
106 /*
108 * This resurrects the belts and suspenders paranoia check by HPA
109 * done in <435560F7.4080006@zytor.com> thread, now enter_repo()
110 * does not do getcwd() based path canonicalizations.
111 *
112 * sl becomes true immediately after seeing '/' and continues to
113 * be true as long as dots continue after that without intervening
114 * non-dot character.
115 */
116 if (!p || (*p != '/' && *p != '~'))
117 return -1;
118 sl = 1; ndot = 0;
119 p++;
120 while (1) {
122 char ch = *p++;
123 if (sl) {
124 if (ch == '.')
125 ndot++;
126 else if (ch == '/') {
127 if (ndot < 3)
128 /* reject //, /./ and /../ */
129 return -1;
130 ndot = 0;
131 }
132 else if (ch == 0) {
133 if (0 < ndot && ndot < 3)
134 /* reject /.$ and /..$ */
135 return -1;
136 return 0;
137 }
138 else
139 sl = ndot = 0;
140 }
141 else if (ch == 0)
142 return 0;
143 else if (ch == '/') {
144 sl = 1;
145 ndot = 0;
146 }
147 }
148}
149static char *path_ok(void)
151{
152 static char rpath[PATH_MAX];
153 static char interp_path[PATH_MAX];
154 int retried_path = 0;
155 char *path;
156 char *dir;
157 dir = directory;
159 if (avoid_alias(dir)) {
161 logerror("'%s': aliased", dir);
162 return NULL;
163 }
164 if (*dir == '~') {
166 if (!user_path) {
167 logerror("'%s': User-path not allowed", dir);
168 return NULL;
169 }
170 if (*user_path) {
171 /* Got either "~alice" or "~alice/foo";
172 * rewrite them to "~alice/%s" or
173 * "~alice/%s/foo".
174 */
175 int namlen, restlen = strlen(dir);
176 char *slash = strchr(dir, '/');
177 if (!slash)
178 slash = dir + restlen;
179 namlen = slash - dir;
180 restlen -= namlen;
181 loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
182 snprintf(rpath, PATH_MAX, "%.*s/%s%.*s",
183 namlen, dir, user_path, restlen, slash);
184 dir = rpath;
185 }
186 }
187 else if (interpolated_path && saw_extended_args) {
188 struct strbuf expanded_path = STRBUF_INIT;
189 struct strbuf_expand_dict_entry dict[] = {
190 { "H", hostname },
191 { "CH", canon_hostname },
192 { "IP", ip_address },
193 { "P", tcp_port },
194 { "D", directory },
195 { "%", "%" },
196 { NULL }
197 };
198 if (*dir != '/') {
200 /* Allow only absolute */
201 logerror("'%s': Non-absolute path denied (interpolated-path active)", dir);
202 return NULL;
203 }
204 strbuf_expand(&expanded_path, interpolated_path,
206 strbuf_expand_dict_cb, &dict);
207 strlcpy(interp_path, expanded_path.buf, PATH_MAX);
208 strbuf_release(&expanded_path);
209 loginfo("Interpolated dir '%s'", interp_path);
210 dir = interp_path;
212 }
213 else if (base_path) {
214 if (*dir != '/') {
215 /* Allow only absolute */
216 logerror("'%s': Non-absolute path denied (base-path active)", dir);
217 return NULL;
218 }
219 snprintf(rpath, PATH_MAX, "%s%s", base_path, dir);
220 dir = rpath;
221 }
222 do {
224 path = enter_repo(dir, strict_paths);
225 if (path)
226 break;
227 /*
229 * if we fail and base_path_relaxed is enabled, try without
230 * prefixing the base path
231 */
232 if (base_path && base_path_relaxed && !retried_path) {
233 dir = directory;
234 retried_path = 1;
235 continue;
236 }
237 break;
238 } while (1);
239 if (!path) {
241 logerror("'%s': unable to chdir or not a git archive", dir);
242 return NULL;
243 }
244 if ( ok_paths && *ok_paths ) {
246 char **pp;
247 int pathlen = strlen(path);
248 /* The validation is done on the paths after enter_repo
250 * appends optional {.git,.git/.git} and friends, but
251 * it does not use getcwd(). So if your /pub is
252 * a symlink to /mnt/pub, you can whitelist /pub and
253 * do not have to say /mnt/pub.
254 * Do not say /pub/.
255 */
256 for ( pp = ok_paths ; *pp ; pp++ ) {
257 int len = strlen(*pp);
258 if (len <= pathlen &&
259 !memcmp(*pp, path, len) &&
260 (path[len] == '\0' ||
261 (!strict_paths && path[len] == '/')))
262 return path;
263 }
264 }
265 else {
266 /* be backwards compatible */
267 if (!strict_paths)
268 return path;
269 }
270 logerror("'%s': not in whitelist", path);
272 return NULL; /* Fallthrough. Deny by default */
273}
274typedef int (*daemon_service_fn)(void);
276struct daemon_service {
277 const char *name;
278 const char *config_name;
279 daemon_service_fn fn;
280 int enabled;
281 int overridable;
282};
283static struct daemon_service *service_looking_at;
285static int service_enabled;
286static int git_daemon_config(const char *var, const char *value, void *cb)
288{
289 if (!prefixcmp(var, "daemon.") &&
290 !strcmp(var + 7, service_looking_at->config_name)) {
291 service_enabled = git_config_bool(var, value);
292 return 0;
293 }
294 /* we are not interested in parsing any other configuration here */
296 return 0;
297}
298static int run_service(struct daemon_service *service)
300{
301 const char *path;
302 int enabled = service->enabled;
303 loginfo("Request %s for '%s'", service->name, directory);
305 if (!enabled && !service->overridable) {
307 logerror("'%s': service not enabled.", service->name);
308 errno = EACCES;
309 return -1;
310 }
311 if (!(path = path_ok()))
313 return -1;
314 /*
316 * Security on the cheap.
317 *
318 * We want a readable HEAD, usable "objects" directory, and
319 * a "git-daemon-export-ok" flag that says that the other side
320 * is ok with us doing this.
321 *
322 * path_ok() uses enter_repo() and does whitelist checking.
323 * We only need to make sure the repository is exported.
324 */
325 if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
327 logerror("'%s': repository not exported.", path);
328 errno = EACCES;
329 return -1;
330 }
331 if (service->overridable) {
333 service_looking_at = service;
334 service_enabled = -1;
335 git_config(git_daemon_config, NULL);
336 if (0 <= service_enabled)
337 enabled = service_enabled;
338 }
339 if (!enabled) {
340 logerror("'%s': service not enabled for '%s'",
341 service->name, path);
342 errno = EACCES;
343 return -1;
344 }
345 /*
347 * We'll ignore SIGTERM from now on, we have a
348 * good client.
349 */
350 signal(SIGTERM, SIG_IGN);
351 return service->fn();
353}
354static int upload_pack(void)
356{
357 /* Timeout as string */
358 char timeout_buf[64];
359 snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout);
361 /* git-upload-pack only ever reads stuff, so this is safe */
363 execl_git_cmd("upload-pack", "--strict", timeout_buf, ".", NULL);
364 return -1;
365}
366static int upload_archive(void)
368{
369 execl_git_cmd("upload-archive", ".", NULL);
370 return -1;
371}
372static int receive_pack(void)
374{
375 execl_git_cmd("receive-pack", ".", NULL);
376 return -1;
377}
378static struct daemon_service daemon_service[] = {
380 { "upload-archive", "uploadarch", upload_archive, 0, 1 },
381 { "upload-pack", "uploadpack", upload_pack, 1, 1 },
382 { "receive-pack", "receivepack", receive_pack, 0, 1 },
383};
384static void enable_service(const char *name, int ena)
386{
387 int i;
388 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
389 if (!strcmp(daemon_service[i].name, name)) {
390 daemon_service[i].enabled = ena;
391 return;
392 }
393 }
394 die("No such service %s", name);
395}
396static void make_service_overridable(const char *name, int ena)
398{
399 int i;
400 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
401 if (!strcmp(daemon_service[i].name, name)) {
402 daemon_service[i].overridable = ena;
403 return;
404 }
405 }
406 die("No such service %s", name);
407}
408/*
410 * Separate the "extra args" information as supplied by the client connection.
411 */
412static void parse_extra_args(char *extra_args, int buflen)
413{
414 char *val;
415 int vallen;
416 char *end = extra_args + buflen;
417 char *hp;
418 while (extra_args < end && *extra_args) {
420 saw_extended_args = 1;
421 if (strncasecmp("host=", extra_args, 5) == 0) {
422 val = extra_args + 5;
423 vallen = strlen(val) + 1;
424 if (*val) {
425 /* Split <host>:<port> at colon. */
426 char *host = val;
427 char *port = strrchr(host, ':');
428 if (port) {
429 *port = 0;
430 port++;
431 free(tcp_port);
432 tcp_port = xstrdup(port);
433 }
434 free(hostname);
435 hostname = xstrdup(host);
436 }
437 /* On to the next one */
439 extra_args = val + vallen;
440 }
441 }
442 /*
444 * Replace literal host with lowercase-ized hostname.
445 */
446 hp = hostname;
447 if (!hp)
448 return;
449 for ( ; *hp; hp++)
450 *hp = tolower(*hp);
451 /*
453 * Locate canonical hostname and its IP address.
454 */
455#ifndef NO_IPV6
456 {
457 struct addrinfo hints;
458 struct addrinfo *ai, *ai0;
459 int gai;
460 static char addrbuf[HOST_NAME_MAX + 1];
461 memset(&hints, 0, sizeof(hints));
463 hints.ai_flags = AI_CANONNAME;
464 gai = getaddrinfo(hostname, 0, &hints, &ai0);
466 if (!gai) {
467 for (ai = ai0; ai; ai = ai->ai_next) {
468 struct sockaddr_in *sin_addr = (void *)ai->ai_addr;
469 inet_ntop(AF_INET, &sin_addr->sin_addr,
471 addrbuf, sizeof(addrbuf));
472 free(canon_hostname);
473 canon_hostname = xstrdup(ai->ai_canonname);
474 free(ip_address);
475 ip_address = xstrdup(addrbuf);
476 break;
477 }
478 freeaddrinfo(ai0);
479 }
480 }
481#else
482 {
483 struct hostent *hent;
484 struct sockaddr_in sa;
485 char **ap;
486 static char addrbuf[HOST_NAME_MAX + 1];
487 hent = gethostbyname(hostname);
489 ap = hent->h_addr_list;
491 memset(&sa, 0, sizeof sa);
492 sa.sin_family = hent->h_addrtype;
493 sa.sin_port = htons(0);
494 memcpy(&sa.sin_addr, *ap, hent->h_length);
495 inet_ntop(hent->h_addrtype, &sa.sin_addr,
497 addrbuf, sizeof(addrbuf));
498 free(canon_hostname);
500 canon_hostname = xstrdup(hent->h_name);
501 free(ip_address);
502 ip_address = xstrdup(addrbuf);
503 }
504#endif
505}
506static int execute(struct sockaddr *addr)
509{
510 static char line[1000];
511 int pktlen, len, i;
512 if (addr) {
514 char addrbuf[256] = "";
515 int port = -1;
516 if (addr->sa_family == AF_INET) {
518 struct sockaddr_in *sin_addr = (void *) addr;
519 inet_ntop(addr->sa_family, &sin_addr->sin_addr, addrbuf, sizeof(addrbuf));
520 port = ntohs(sin_addr->sin_port);
521#ifndef NO_IPV6
522 } else if (addr && addr->sa_family == AF_INET6) {
523 struct sockaddr_in6 *sin6_addr = (void *) addr;
524 char *buf = addrbuf;
526 *buf++ = '['; *buf = '\0'; /* stpcpy() is cool */
527 inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(addrbuf) - 1);
528 strcat(buf, "]");
529 port = ntohs(sin6_addr->sin6_port);
531#endif
532 }
533 loginfo("Connection from %s:%d", addrbuf, port);
534 setenv("REMOTE_ADDR", addrbuf, 1);
535 }
536 else {
537 unsetenv("REMOTE_ADDR");
538 }
539 alarm(init_timeout ? init_timeout : timeout);
541 pktlen = packet_read_line(0, line, sizeof(line));
542 alarm(0);
543 len = strlen(line);
545 if (pktlen != len)
546 loginfo("Extended attributes (%d bytes) exist <%.*s>",
547 (int) pktlen - len,
548 (int) pktlen - len, line + len + 1);
549 if (len && line[len-1] == '\n') {
550 line[--len] = 0;
551 pktlen--;
552 }
553 free(hostname);
555 free(canon_hostname);
556 free(ip_address);
557 free(tcp_port);
558 free(directory);
559 hostname = canon_hostname = ip_address = tcp_port = directory = NULL;
560 if (len != pktlen)
562 parse_extra_args(line + len + 1, pktlen - len - 1);
563 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
565 struct daemon_service *s = &(daemon_service[i]);
566 int namelen = strlen(s->name);
567 if (!prefixcmp(line, "git-") &&
568 !strncmp(s->name, line + 4, namelen) &&
569 line[namelen + 4] == ' ') {
570 /*
571 * Note: The directory here is probably context sensitive,
572 * and might depend on the actual service being performed.
573 */
574 free(directory);
575 directory = xstrdup(line + namelen + 5);
576 return run_service(s);
577 }
578 }
579 logerror("Protocol error: '%s'", line);
581 return -1;
582}
583static int max_connections = 32;
585static unsigned int live_children;
587static struct child {
589 struct child *next;
590 pid_t pid;
591 struct sockaddr_storage address;
592} *firstborn;
593static void add_child(pid_t pid, struct sockaddr *addr, int addrlen)
595{
596 struct child *newborn, **cradle;
597 /*
599 * This must be xcalloc() -- we'll compare the whole sockaddr_storage
600 * but individual address may be shorter.
601 */
602 newborn = xcalloc(1, sizeof(*newborn));
603 live_children++;
604 newborn->pid = pid;
605 memcpy(&newborn->address, addr, addrlen);
606 for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next)
607 if (!memcmp(&(*cradle)->address, &newborn->address,
608 sizeof(newborn->address)))
609 break;
610 newborn->next = *cradle;
611 *cradle = newborn;
612}
613static void remove_child(pid_t pid)
615{
616 struct child **cradle, *blanket;
617 for (cradle = &firstborn; (blanket = *cradle); cradle = &blanket->next)
619 if (blanket->pid == pid) {
620 *cradle = blanket->next;
621 live_children--;
622 free(blanket);
623 break;
624 }
625}
626/*
628 * This gets called if the number of connections grows
629 * past "max_connections".
630 *
631 * We kill the newest connection from a duplicate IP.
632 */
633static void kill_some_child(void)
634{
635 const struct child *blanket, *next;
636 if (!(blanket = firstborn))
638 return;
639 for (; (next = blanket->next); blanket = next)
641 if (!memcmp(&blanket->address, &next->address,
642 sizeof(next->address))) {
643 kill(blanket->pid, SIGTERM);
644 break;
645 }
646}
647static void check_dead_children(void)
649{
650 int status;
651 pid_t pid;
652 while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
654 const char *dead = "";
655 remove_child(pid);
656 if (!WIFEXITED(status) || (WEXITSTATUS(status) > 0))
657 dead = " (with error)";
658 loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead);
659 }
660}
661static void handle(int incoming, struct sockaddr *addr, int addrlen)
663{
664 pid_t pid;
665 if (max_connections && live_children >= max_connections) {
667 kill_some_child();
668 sleep(1); /* give it some time to die */
669 check_dead_children();
670 if (live_children >= max_connections) {
671 close(incoming);
672 logerror("Too many children, dropping connection");
673 return;
674 }
675 }
676 if ((pid = fork())) {
678 close(incoming);
679 if (pid < 0) {
680 logerror("Couldn't fork %s", strerror(errno));
681 return;
682 }
683 add_child(pid, addr, addrlen);
685 return;
686 }
687 dup2(incoming, 0);
689 dup2(incoming, 1);
690 close(incoming);
691 exit(execute(addr));
693}
694static void child_handler(int signo)
696{
697 /*
698 * Otherwise empty handler because systemcalls will get interrupted
699 * upon signal receipt
700 * SysV needs the handler to be rearmed
701 */
702 signal(SIGCHLD, child_handler);
703}
704static int set_reuse_addr(int sockfd)
706{
707 int on = 1;
708 if (!reuseaddr)
710 return 0;
711 return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
712 &on, sizeof(on));
713}
714#ifndef NO_IPV6
716static int socksetup(char *listen_addr, int listen_port, int **socklist_p)
718{
719 int socknum = 0, *socklist = NULL;
720 int maxfd = -1;
721 char pbuf[NI_MAXSERV];
722 struct addrinfo hints, *ai0, *ai;
723 int gai;
724 long flags;
725 sprintf(pbuf, "%d", listen_port);
727 memset(&hints, 0, sizeof(hints));
728 hints.ai_family = AF_UNSPEC;
729 hints.ai_socktype = SOCK_STREAM;
730 hints.ai_protocol = IPPROTO_TCP;
731 hints.ai_flags = AI_PASSIVE;
732 gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0);
734 if (gai)
735 die("getaddrinfo() failed: %s\n", gai_strerror(gai));
736 for (ai = ai0; ai; ai = ai->ai_next) {
738 int sockfd;
739 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
741 if (sockfd < 0)
742 continue;
743 if (sockfd >= FD_SETSIZE) {
744 logerror("Socket descriptor too large");
745 close(sockfd);
746 continue;
747 }
748#ifdef IPV6_V6ONLY
750 if (ai->ai_family == AF_INET6) {
751 int on = 1;
752 setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
753 &on, sizeof(on));
754 /* Note: error is not fatal */
755 }
756#endif
757 if (set_reuse_addr(sockfd)) {
759 close(sockfd);
760 continue;
761 }
762 if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
764 close(sockfd);
765 continue; /* not fatal */
766 }
767 if (listen(sockfd, 5) < 0) {
768 close(sockfd);
769 continue; /* not fatal */
770 }
771 flags = fcntl(sockfd, F_GETFD, 0);
773 if (flags >= 0)
774 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
775 socklist = xrealloc(socklist, sizeof(int) * (socknum + 1));
777 socklist[socknum++] = sockfd;
778 if (maxfd < sockfd)
780 maxfd = sockfd;
781 }
782 freeaddrinfo(ai0);
784 *socklist_p = socklist;
786 return socknum;
787}
788#else /* NO_IPV6 */
790static int socksetup(char *listen_addr, int listen_port, int **socklist_p)
792{
793 struct sockaddr_in sin;
794 int sockfd;
795 long flags;
796 memset(&sin, 0, sizeof sin);
798 sin.sin_family = AF_INET;
799 sin.sin_port = htons(listen_port);
800 if (listen_addr) {
802 /* Well, host better be an IP address here. */
803 if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0)
804 return 0;
805 } else {
806 sin.sin_addr.s_addr = htonl(INADDR_ANY);
807 }
808 sockfd = socket(AF_INET, SOCK_STREAM, 0);
810 if (sockfd < 0)
811 return 0;
812 if (set_reuse_addr(sockfd)) {
814 close(sockfd);
815 return 0;
816 }
817 if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
819 close(sockfd);
820 return 0;
821 }
822 if (listen(sockfd, 5) < 0) {
824 close(sockfd);
825 return 0;
826 }
827 flags = fcntl(sockfd, F_GETFD, 0);
829 if (flags >= 0)
830 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
831 *socklist_p = xmalloc(sizeof(int));
833 **socklist_p = sockfd;
834 return 1;
835}
836#endif
838static int service_loop(int socknum, int *socklist)
840{
841 struct pollfd *pfd;
842 int i;
843 pfd = xcalloc(socknum, sizeof(struct pollfd));
845 for (i = 0; i < socknum; i++) {
847 pfd[i].fd = socklist[i];
848 pfd[i].events = POLLIN;
849 }
850 signal(SIGCHLD, child_handler);
852 for (;;) {
854 int i;
855 check_dead_children();
857 if (poll(pfd, socknum, -1) < 0) {
859 if (errno != EINTR) {
860 logerror("Poll failed, resuming: %s",
861 strerror(errno));
862 sleep(1);
863 }
864 continue;
865 }
866 for (i = 0; i < socknum; i++) {
868 if (pfd[i].revents & POLLIN) {
869 struct sockaddr_storage ss;
870 unsigned int sslen = sizeof(ss);
871 int incoming = accept(pfd[i].fd, (struct sockaddr *)&ss, &sslen);
872 if (incoming < 0) {
873 switch (errno) {
874 case EAGAIN:
875 case EINTR:
876 case ECONNABORTED:
877 continue;
878 default:
879 die("accept returned %s", strerror(errno));
880 }
881 }
882 handle(incoming, (struct sockaddr *)&ss, sslen);
883 }
884 }
885 }
886}
887/* if any standard file descriptor is missing open it to /dev/null */
889static void sanitize_stdfds(void)
890{
891 int fd = open("/dev/null", O_RDWR, 0);
892 while (fd != -1 && fd < 2)
893 fd = dup(fd);
894 if (fd == -1)
895 die("open /dev/null or dup failed: %s", strerror(errno));
896 if (fd > 2)
897 close(fd);
898}
899static void daemonize(void)
901{
902 switch (fork()) {
903 case 0:
904 break;
905 case -1:
906 die("fork failed: %s", strerror(errno));
907 default:
908 exit(0);
909 }
910 if (setsid() == -1)
911 die("setsid failed: %s", strerror(errno));
912 close(0);
913 close(1);
914 close(2);
915 sanitize_stdfds();
916}
917static void store_pid(const char *path)
919{
920 FILE *f = fopen(path, "w");
921 if (!f)
922 die("cannot open pid file %s: %s", path, strerror(errno));
923 if (fprintf(f, "%"PRIuMAX"\n", (uintmax_t) getpid()) < 0 || fclose(f) != 0)
924 die("failed to write pid file %s: %s", path, strerror(errno));
925}
926static int serve(char *listen_addr, int listen_port, struct passwd *pass, gid_t gid)
928{
929 int socknum, *socklist;
930 socknum = socksetup(listen_addr, listen_port, &socklist);
932 if (socknum == 0)
933 die("unable to allocate any listen sockets on host %s port %u",
934 listen_addr, listen_port);
935 if (pass && gid &&
937 (initgroups(pass->pw_name, gid) || setgid (gid) ||
938 setuid(pass->pw_uid)))
939 die("cannot drop privileges");
940 return service_loop(socknum, socklist);
942}
943int main(int argc, char **argv)
945{
946 int listen_port = 0;
947 char *listen_addr = NULL;
948 int inetd_mode = 0;
949 const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
950 int detach = 0;
951 struct passwd *pass = NULL;
952 struct group *group;
953 gid_t gid = 0;
954 int i;
955 for (i = 1; i < argc; i++) {
957 char *arg = argv[i];
958 if (!prefixcmp(arg, "--listen=")) {
960 char *p = arg + 9;
961 char *ph = listen_addr = xmalloc(strlen(arg + 9) + 1);
962 while (*p)
963 *ph++ = tolower(*p++);
964 *ph = 0;
965 continue;
966 }
967 if (!prefixcmp(arg, "--port=")) {
968 char *end;
969 unsigned long n;
970 n = strtoul(arg+7, &end, 0);
971 if (arg[7] && !*end) {
972 listen_port = n;
973 continue;
974 }
975 }
976 if (!strcmp(arg, "--inetd")) {
977 inetd_mode = 1;
978 log_syslog = 1;
979 continue;
980 }
981 if (!strcmp(arg, "--verbose")) {
982 verbose = 1;
983 continue;
984 }
985 if (!strcmp(arg, "--syslog")) {
986 log_syslog = 1;
987 continue;
988 }
989 if (!strcmp(arg, "--export-all")) {
990 export_all_trees = 1;
991 continue;
992 }
993 if (!prefixcmp(arg, "--timeout=")) {
994 timeout = atoi(arg+10);
995 continue;
996 }
997 if (!prefixcmp(arg, "--init-timeout=")) {
998 init_timeout = atoi(arg+15);
999 continue;
1000 }
1001 if (!prefixcmp(arg, "--max-connections=")) {
1002 max_connections = atoi(arg+18);
1003 if (max_connections < 0)
1004 max_connections = 0; /* unlimited */
1005 continue;
1006 }
1007 if (!strcmp(arg, "--strict-paths")) {
1008 strict_paths = 1;
1009 continue;
1010 }
1011 if (!prefixcmp(arg, "--base-path=")) {
1012 base_path = arg+12;
1013 continue;
1014 }
1015 if (!strcmp(arg, "--base-path-relaxed")) {
1016 base_path_relaxed = 1;
1017 continue;
1018 }
1019 if (!prefixcmp(arg, "--interpolated-path=")) {
1020 interpolated_path = arg+20;
1021 continue;
1022 }
1023 if (!strcmp(arg, "--reuseaddr")) {
1024 reuseaddr = 1;
1025 continue;
1026 }
1027 if (!strcmp(arg, "--user-path")) {
1028 user_path = "";
1029 continue;
1030 }
1031 if (!prefixcmp(arg, "--user-path=")) {
1032 user_path = arg + 12;
1033 continue;
1034 }
1035 if (!prefixcmp(arg, "--pid-file=")) {
1036 pid_file = arg + 11;
1037 continue;
1038 }
1039 if (!strcmp(arg, "--detach")) {
1040 detach = 1;
1041 log_syslog = 1;
1042 continue;
1043 }
1044 if (!prefixcmp(arg, "--user=")) {
1045 user_name = arg + 7;
1046 continue;
1047 }
1048 if (!prefixcmp(arg, "--group=")) {
1049 group_name = arg + 8;
1050 continue;
1051 }
1052 if (!prefixcmp(arg, "--enable=")) {
1053 enable_service(arg + 9, 1);
1054 continue;
1055 }
1056 if (!prefixcmp(arg, "--disable=")) {
1057 enable_service(arg + 10, 0);
1058 continue;
1059 }
1060 if (!prefixcmp(arg, "--allow-override=")) {
1061 make_service_overridable(arg + 17, 1);
1062 continue;
1063 }
1064 if (!prefixcmp(arg, "--forbid-override=")) {
1065 make_service_overridable(arg + 18, 0);
1066 continue;
1067 }
1068 if (!strcmp(arg, "--")) {
1069 ok_paths = &argv[i+1];
1070 break;
1071 } else if (arg[0] != '-') {
1072 ok_paths = &argv[i];
1073 break;
1074 }
1075 usage(daemon_usage);
1077 }
1078 if (log_syslog) {
1080 openlog("git-daemon", LOG_PID, LOG_DAEMON);
1081 set_die_routine(daemon_die);
1082 } else
1083 /* avoid splitting a message in the middle */
1084 setvbuf(stderr, NULL, _IOLBF, 0);
1085 if (inetd_mode && (group_name || user_name))
1087 die("--user and --group are incompatible with --inetd");
1088 if (inetd_mode && (listen_port || listen_addr))
1090 die("--listen= and --port= are incompatible with --inetd");
1091 else if (listen_port == 0)
1092 listen_port = DEFAULT_GIT_PORT;
1093 if (group_name && !user_name)
1095 die("--group supplied without --user");
1096 if (user_name) {
1098 pass = getpwnam(user_name);
1099 if (!pass)
1100 die("user not found - %s", user_name);
1101 if (!group_name)
1103 gid = pass->pw_gid;
1104 else {
1105 group = getgrnam(group_name);
1106 if (!group)
1107 die("group not found - %s", group_name);
1108 gid = group->gr_gid;
1110 }
1111 }
1112 if (strict_paths && (!ok_paths || !*ok_paths))
1114 die("option --strict-paths requires a whitelist");
1115 if (base_path && !is_directory(base_path))
1117 die("base-path '%s' does not exist or is not a directory",
1118 base_path);
1119 if (inetd_mode) {
1121 struct sockaddr_storage ss;
1122 struct sockaddr *peer = (struct sockaddr *)&ss;
1123 socklen_t slen = sizeof(ss);
1124 freopen("/dev/null", "w", stderr);
1126 if (getpeername(0, peer, &slen))
1128 peer = NULL;
1129 return execute(peer);
1131 }
1132 if (detach) {
1134 daemonize();
1135 loginfo("Ready to rumble");
1136 }
1137 else
1138 sanitize_stdfds();
1139 if (pid_file)
1141 store_pid(pid_file);
1142 return serve(listen_addr, listen_port, pass, gid);
1144}