64f60c431ba1f566a1b292111ae819d49ddc35f0
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 while (extra_args < end && *extra_args) {
419 saw_extended_args = 1;
420 if (strncasecmp("host=", extra_args, 5) == 0) {
421 val = extra_args + 5;
422 vallen = strlen(val) + 1;
423 if (*val) {
424 /* Split <host>:<port> at colon. */
425 char *host = val;
426 char *port = strrchr(host, ':');
427 if (port) {
428 *port = 0;
429 port++;
430 free(tcp_port);
431 tcp_port = xstrdup(port);
432 }
433 free(hostname);
434 hostname = xstrdup(host);
435 }
436 /* On to the next one */
438 extra_args = val + vallen;
439 }
440 }
441}
442static void fill_in_extra_table_entries(void)
444{
445 char *hp;
446 /*
448 * Replace literal host with lowercase-ized hostname.
449 */
450 hp = hostname;
451 if (!hp)
452 return;
453 for ( ; *hp; hp++)
454 *hp = tolower(*hp);
455 /*
457 * Locate canonical hostname and its IP address.
458 */
459#ifndef NO_IPV6
460 {
461 struct addrinfo hints;
462 struct addrinfo *ai, *ai0;
463 int gai;
464 static char addrbuf[HOST_NAME_MAX + 1];
465 memset(&hints, 0, sizeof(hints));
467 hints.ai_flags = AI_CANONNAME;
468 gai = getaddrinfo(hostname, 0, &hints, &ai0);
470 if (!gai) {
471 for (ai = ai0; ai; ai = ai->ai_next) {
472 struct sockaddr_in *sin_addr = (void *)ai->ai_addr;
473 inet_ntop(AF_INET, &sin_addr->sin_addr,
475 addrbuf, sizeof(addrbuf));
476 free(canon_hostname);
477 canon_hostname = xstrdup(ai->ai_canonname);
478 free(ip_address);
479 ip_address = xstrdup(addrbuf);
480 break;
481 }
482 freeaddrinfo(ai0);
483 }
484 }
485#else
486 {
487 struct hostent *hent;
488 struct sockaddr_in sa;
489 char **ap;
490 static char addrbuf[HOST_NAME_MAX + 1];
491 hent = gethostbyname(hostname);
493 ap = hent->h_addr_list;
495 memset(&sa, 0, sizeof sa);
496 sa.sin_family = hent->h_addrtype;
497 sa.sin_port = htons(0);
498 memcpy(&sa.sin_addr, *ap, hent->h_length);
499 inet_ntop(hent->h_addrtype, &sa.sin_addr,
501 addrbuf, sizeof(addrbuf));
502 free(canon_hostname);
504 canon_hostname = xstrdup(hent->h_name);
505 free(ip_address);
506 ip_address = xstrdup(addrbuf);
507 }
508#endif
509}
510static int execute(struct sockaddr *addr)
513{
514 static char line[1000];
515 int pktlen, len, i;
516 if (addr) {
518 char addrbuf[256] = "";
519 int port = -1;
520 if (addr->sa_family == AF_INET) {
522 struct sockaddr_in *sin_addr = (void *) addr;
523 inet_ntop(addr->sa_family, &sin_addr->sin_addr, addrbuf, sizeof(addrbuf));
524 port = ntohs(sin_addr->sin_port);
525#ifndef NO_IPV6
526 } else if (addr && addr->sa_family == AF_INET6) {
527 struct sockaddr_in6 *sin6_addr = (void *) addr;
528 char *buf = addrbuf;
530 *buf++ = '['; *buf = '\0'; /* stpcpy() is cool */
531 inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(addrbuf) - 1);
532 strcat(buf, "]");
533 port = ntohs(sin6_addr->sin6_port);
535#endif
536 }
537 loginfo("Connection from %s:%d", addrbuf, port);
538 setenv("REMOTE_ADDR", addrbuf, 1);
539 }
540 else {
541 unsetenv("REMOTE_ADDR");
542 }
543 alarm(init_timeout ? init_timeout : timeout);
545 pktlen = packet_read_line(0, line, sizeof(line));
546 alarm(0);
547 len = strlen(line);
549 if (pktlen != len)
550 loginfo("Extended attributes (%d bytes) exist <%.*s>",
551 (int) pktlen - len,
552 (int) pktlen - len, line + len + 1);
553 if (len && line[len-1] == '\n') {
554 line[--len] = 0;
555 pktlen--;
556 }
557 free(hostname);
559 free(canon_hostname);
560 free(ip_address);
561 free(tcp_port);
562 free(directory);
563 hostname = canon_hostname = ip_address = tcp_port = directory = NULL;
564 if (len != pktlen) {
566 parse_extra_args(line + len + 1, pktlen - len - 1);
567 fill_in_extra_table_entries();
568 }
569 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
571 struct daemon_service *s = &(daemon_service[i]);
572 int namelen = strlen(s->name);
573 if (!prefixcmp(line, "git-") &&
574 !strncmp(s->name, line + 4, namelen) &&
575 line[namelen + 4] == ' ') {
576 /*
577 * Note: The directory here is probably context sensitive,
578 * and might depend on the actual service being performed.
579 */
580 free(directory);
581 directory = xstrdup(line + namelen + 5);
582 return run_service(s);
583 }
584 }
585 logerror("Protocol error: '%s'", line);
587 return -1;
588}
589static int max_connections = 32;
591static unsigned int live_children;
593static struct child {
595 struct child *next;
596 pid_t pid;
597 struct sockaddr_storage address;
598} *firstborn;
599static void add_child(pid_t pid, struct sockaddr *addr, int addrlen)
601{
602 struct child *newborn, **cradle;
603 /*
605 * This must be xcalloc() -- we'll compare the whole sockaddr_storage
606 * but individual address may be shorter.
607 */
608 newborn = xcalloc(1, sizeof(*newborn));
609 live_children++;
610 newborn->pid = pid;
611 memcpy(&newborn->address, addr, addrlen);
612 for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next)
613 if (!memcmp(&(*cradle)->address, &newborn->address,
614 sizeof(newborn->address)))
615 break;
616 newborn->next = *cradle;
617 *cradle = newborn;
618}
619static void remove_child(pid_t pid)
621{
622 struct child **cradle, *blanket;
623 for (cradle = &firstborn; (blanket = *cradle); cradle = &blanket->next)
625 if (blanket->pid == pid) {
626 *cradle = blanket->next;
627 live_children--;
628 free(blanket);
629 break;
630 }
631}
632/*
634 * This gets called if the number of connections grows
635 * past "max_connections".
636 *
637 * We kill the newest connection from a duplicate IP.
638 */
639static void kill_some_child(void)
640{
641 const struct child *blanket, *next;
642 if (!(blanket = firstborn))
644 return;
645 for (; (next = blanket->next); blanket = next)
647 if (!memcmp(&blanket->address, &next->address,
648 sizeof(next->address))) {
649 kill(blanket->pid, SIGTERM);
650 break;
651 }
652}
653static void check_dead_children(void)
655{
656 int status;
657 pid_t pid;
658 while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
660 const char *dead = "";
661 remove_child(pid);
662 if (!WIFEXITED(status) || (WEXITSTATUS(status) > 0))
663 dead = " (with error)";
664 loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead);
665 }
666}
667static void handle(int incoming, struct sockaddr *addr, int addrlen)
669{
670 pid_t pid;
671 if (max_connections && live_children >= max_connections) {
673 kill_some_child();
674 sleep(1); /* give it some time to die */
675 check_dead_children();
676 if (live_children >= max_connections) {
677 close(incoming);
678 logerror("Too many children, dropping connection");
679 return;
680 }
681 }
682 if ((pid = fork())) {
684 close(incoming);
685 if (pid < 0) {
686 logerror("Couldn't fork %s", strerror(errno));
687 return;
688 }
689 add_child(pid, addr, addrlen);
691 return;
692 }
693 dup2(incoming, 0);
695 dup2(incoming, 1);
696 close(incoming);
697 exit(execute(addr));
699}
700static void child_handler(int signo)
702{
703 /*
704 * Otherwise empty handler because systemcalls will get interrupted
705 * upon signal receipt
706 * SysV needs the handler to be rearmed
707 */
708 signal(SIGCHLD, child_handler);
709}
710static int set_reuse_addr(int sockfd)
712{
713 int on = 1;
714 if (!reuseaddr)
716 return 0;
717 return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
718 &on, sizeof(on));
719}
720#ifndef NO_IPV6
722static int socksetup(char *listen_addr, int listen_port, int **socklist_p)
724{
725 int socknum = 0, *socklist = NULL;
726 int maxfd = -1;
727 char pbuf[NI_MAXSERV];
728 struct addrinfo hints, *ai0, *ai;
729 int gai;
730 long flags;
731 sprintf(pbuf, "%d", listen_port);
733 memset(&hints, 0, sizeof(hints));
734 hints.ai_family = AF_UNSPEC;
735 hints.ai_socktype = SOCK_STREAM;
736 hints.ai_protocol = IPPROTO_TCP;
737 hints.ai_flags = AI_PASSIVE;
738 gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0);
740 if (gai)
741 die("getaddrinfo() failed: %s\n", gai_strerror(gai));
742 for (ai = ai0; ai; ai = ai->ai_next) {
744 int sockfd;
745 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
747 if (sockfd < 0)
748 continue;
749 if (sockfd >= FD_SETSIZE) {
750 logerror("Socket descriptor too large");
751 close(sockfd);
752 continue;
753 }
754#ifdef IPV6_V6ONLY
756 if (ai->ai_family == AF_INET6) {
757 int on = 1;
758 setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
759 &on, sizeof(on));
760 /* Note: error is not fatal */
761 }
762#endif
763 if (set_reuse_addr(sockfd)) {
765 close(sockfd);
766 continue;
767 }
768 if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
770 close(sockfd);
771 continue; /* not fatal */
772 }
773 if (listen(sockfd, 5) < 0) {
774 close(sockfd);
775 continue; /* not fatal */
776 }
777 flags = fcntl(sockfd, F_GETFD, 0);
779 if (flags >= 0)
780 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
781 socklist = xrealloc(socklist, sizeof(int) * (socknum + 1));
783 socklist[socknum++] = sockfd;
784 if (maxfd < sockfd)
786 maxfd = sockfd;
787 }
788 freeaddrinfo(ai0);
790 *socklist_p = socklist;
792 return socknum;
793}
794#else /* NO_IPV6 */
796static int socksetup(char *listen_addr, int listen_port, int **socklist_p)
798{
799 struct sockaddr_in sin;
800 int sockfd;
801 long flags;
802 memset(&sin, 0, sizeof sin);
804 sin.sin_family = AF_INET;
805 sin.sin_port = htons(listen_port);
806 if (listen_addr) {
808 /* Well, host better be an IP address here. */
809 if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0)
810 return 0;
811 } else {
812 sin.sin_addr.s_addr = htonl(INADDR_ANY);
813 }
814 sockfd = socket(AF_INET, SOCK_STREAM, 0);
816 if (sockfd < 0)
817 return 0;
818 if (set_reuse_addr(sockfd)) {
820 close(sockfd);
821 return 0;
822 }
823 if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
825 close(sockfd);
826 return 0;
827 }
828 if (listen(sockfd, 5) < 0) {
830 close(sockfd);
831 return 0;
832 }
833 flags = fcntl(sockfd, F_GETFD, 0);
835 if (flags >= 0)
836 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
837 *socklist_p = xmalloc(sizeof(int));
839 **socklist_p = sockfd;
840 return 1;
841}
842#endif
844static int service_loop(int socknum, int *socklist)
846{
847 struct pollfd *pfd;
848 int i;
849 pfd = xcalloc(socknum, sizeof(struct pollfd));
851 for (i = 0; i < socknum; i++) {
853 pfd[i].fd = socklist[i];
854 pfd[i].events = POLLIN;
855 }
856 signal(SIGCHLD, child_handler);
858 for (;;) {
860 int i;
861 check_dead_children();
863 if (poll(pfd, socknum, -1) < 0) {
865 if (errno != EINTR) {
866 logerror("Poll failed, resuming: %s",
867 strerror(errno));
868 sleep(1);
869 }
870 continue;
871 }
872 for (i = 0; i < socknum; i++) {
874 if (pfd[i].revents & POLLIN) {
875 struct sockaddr_storage ss;
876 unsigned int sslen = sizeof(ss);
877 int incoming = accept(pfd[i].fd, (struct sockaddr *)&ss, &sslen);
878 if (incoming < 0) {
879 switch (errno) {
880 case EAGAIN:
881 case EINTR:
882 case ECONNABORTED:
883 continue;
884 default:
885 die("accept returned %s", strerror(errno));
886 }
887 }
888 handle(incoming, (struct sockaddr *)&ss, sslen);
889 }
890 }
891 }
892}
893/* if any standard file descriptor is missing open it to /dev/null */
895static void sanitize_stdfds(void)
896{
897 int fd = open("/dev/null", O_RDWR, 0);
898 while (fd != -1 && fd < 2)
899 fd = dup(fd);
900 if (fd == -1)
901 die("open /dev/null or dup failed: %s", strerror(errno));
902 if (fd > 2)
903 close(fd);
904}
905static void daemonize(void)
907{
908 switch (fork()) {
909 case 0:
910 break;
911 case -1:
912 die("fork failed: %s", strerror(errno));
913 default:
914 exit(0);
915 }
916 if (setsid() == -1)
917 die("setsid failed: %s", strerror(errno));
918 close(0);
919 close(1);
920 close(2);
921 sanitize_stdfds();
922}
923static void store_pid(const char *path)
925{
926 FILE *f = fopen(path, "w");
927 if (!f)
928 die("cannot open pid file %s: %s", path, strerror(errno));
929 if (fprintf(f, "%"PRIuMAX"\n", (uintmax_t) getpid()) < 0 || fclose(f) != 0)
930 die("failed to write pid file %s: %s", path, strerror(errno));
931}
932static int serve(char *listen_addr, int listen_port, struct passwd *pass, gid_t gid)
934{
935 int socknum, *socklist;
936 socknum = socksetup(listen_addr, listen_port, &socklist);
938 if (socknum == 0)
939 die("unable to allocate any listen sockets on host %s port %u",
940 listen_addr, listen_port);
941 if (pass && gid &&
943 (initgroups(pass->pw_name, gid) || setgid (gid) ||
944 setuid(pass->pw_uid)))
945 die("cannot drop privileges");
946 return service_loop(socknum, socklist);
948}
949int main(int argc, char **argv)
951{
952 int listen_port = 0;
953 char *listen_addr = NULL;
954 int inetd_mode = 0;
955 const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
956 int detach = 0;
957 struct passwd *pass = NULL;
958 struct group *group;
959 gid_t gid = 0;
960 int i;
961 for (i = 1; i < argc; i++) {
963 char *arg = argv[i];
964 if (!prefixcmp(arg, "--listen=")) {
966 char *p = arg + 9;
967 char *ph = listen_addr = xmalloc(strlen(arg + 9) + 1);
968 while (*p)
969 *ph++ = tolower(*p++);
970 *ph = 0;
971 continue;
972 }
973 if (!prefixcmp(arg, "--port=")) {
974 char *end;
975 unsigned long n;
976 n = strtoul(arg+7, &end, 0);
977 if (arg[7] && !*end) {
978 listen_port = n;
979 continue;
980 }
981 }
982 if (!strcmp(arg, "--inetd")) {
983 inetd_mode = 1;
984 log_syslog = 1;
985 continue;
986 }
987 if (!strcmp(arg, "--verbose")) {
988 verbose = 1;
989 continue;
990 }
991 if (!strcmp(arg, "--syslog")) {
992 log_syslog = 1;
993 continue;
994 }
995 if (!strcmp(arg, "--export-all")) {
996 export_all_trees = 1;
997 continue;
998 }
999 if (!prefixcmp(arg, "--timeout=")) {
1000 timeout = atoi(arg+10);
1001 continue;
1002 }
1003 if (!prefixcmp(arg, "--init-timeout=")) {
1004 init_timeout = atoi(arg+15);
1005 continue;
1006 }
1007 if (!prefixcmp(arg, "--max-connections=")) {
1008 max_connections = atoi(arg+18);
1009 if (max_connections < 0)
1010 max_connections = 0; /* unlimited */
1011 continue;
1012 }
1013 if (!strcmp(arg, "--strict-paths")) {
1014 strict_paths = 1;
1015 continue;
1016 }
1017 if (!prefixcmp(arg, "--base-path=")) {
1018 base_path = arg+12;
1019 continue;
1020 }
1021 if (!strcmp(arg, "--base-path-relaxed")) {
1022 base_path_relaxed = 1;
1023 continue;
1024 }
1025 if (!prefixcmp(arg, "--interpolated-path=")) {
1026 interpolated_path = arg+20;
1027 continue;
1028 }
1029 if (!strcmp(arg, "--reuseaddr")) {
1030 reuseaddr = 1;
1031 continue;
1032 }
1033 if (!strcmp(arg, "--user-path")) {
1034 user_path = "";
1035 continue;
1036 }
1037 if (!prefixcmp(arg, "--user-path=")) {
1038 user_path = arg + 12;
1039 continue;
1040 }
1041 if (!prefixcmp(arg, "--pid-file=")) {
1042 pid_file = arg + 11;
1043 continue;
1044 }
1045 if (!strcmp(arg, "--detach")) {
1046 detach = 1;
1047 log_syslog = 1;
1048 continue;
1049 }
1050 if (!prefixcmp(arg, "--user=")) {
1051 user_name = arg + 7;
1052 continue;
1053 }
1054 if (!prefixcmp(arg, "--group=")) {
1055 group_name = arg + 8;
1056 continue;
1057 }
1058 if (!prefixcmp(arg, "--enable=")) {
1059 enable_service(arg + 9, 1);
1060 continue;
1061 }
1062 if (!prefixcmp(arg, "--disable=")) {
1063 enable_service(arg + 10, 0);
1064 continue;
1065 }
1066 if (!prefixcmp(arg, "--allow-override=")) {
1067 make_service_overridable(arg + 17, 1);
1068 continue;
1069 }
1070 if (!prefixcmp(arg, "--forbid-override=")) {
1071 make_service_overridable(arg + 18, 0);
1072 continue;
1073 }
1074 if (!strcmp(arg, "--")) {
1075 ok_paths = &argv[i+1];
1076 break;
1077 } else if (arg[0] != '-') {
1078 ok_paths = &argv[i];
1079 break;
1080 }
1081 usage(daemon_usage);
1083 }
1084 if (log_syslog) {
1086 openlog("git-daemon", LOG_PID, LOG_DAEMON);
1087 set_die_routine(daemon_die);
1088 } else
1089 /* avoid splitting a message in the middle */
1090 setvbuf(stderr, NULL, _IOLBF, 0);
1091 if (inetd_mode && (group_name || user_name))
1093 die("--user and --group are incompatible with --inetd");
1094 if (inetd_mode && (listen_port || listen_addr))
1096 die("--listen= and --port= are incompatible with --inetd");
1097 else if (listen_port == 0)
1098 listen_port = DEFAULT_GIT_PORT;
1099 if (group_name && !user_name)
1101 die("--group supplied without --user");
1102 if (user_name) {
1104 pass = getpwnam(user_name);
1105 if (!pass)
1106 die("user not found - %s", user_name);
1107 if (!group_name)
1109 gid = pass->pw_gid;
1110 else {
1111 group = getgrnam(group_name);
1112 if (!group)
1113 die("group not found - %s", group_name);
1114 gid = group->gr_gid;
1116 }
1117 }
1118 if (strict_paths && (!ok_paths || !*ok_paths))
1120 die("option --strict-paths requires a whitelist");
1121 if (base_path && !is_directory(base_path))
1123 die("base-path '%s' does not exist or is not a directory",
1124 base_path);
1125 if (inetd_mode) {
1127 struct sockaddr_storage ss;
1128 struct sockaddr *peer = (struct sockaddr *)&ss;
1129 socklen_t slen = sizeof(ss);
1130 freopen("/dev/null", "w", stderr);
1132 if (getpeername(0, peer, &slen))
1134 peer = NULL;
1135 return execute(peer);
1137 }
1138 if (detach) {
1140 daemonize();
1141 loginfo("Ready to rumble");
1142 }
1143 else
1144 sanitize_stdfds();
1145 if (pid_file)
1147 store_pid(pid_file);
1148 return serve(listen_addr, listen_port, pass, gid);
1150}