941c095df4530b700858afeb9a30187725dda4d3
1#include "cache.h"
2#include "pkt-line.h"
3#include "exec_cmd.h"
4#include "run-command.h"
5#include "strbuf.h"
6#include "string-list.h"
7#ifndef HOST_NAME_MAX
9#define HOST_NAME_MAX 256
10#endif
11#ifndef NI_MAXSERV
13#define NI_MAXSERV 32
14#endif
15static int log_syslog;
17static int verbose;
18static int reuseaddr;
19static 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] [--detach] [--pid-file=<file>]\n"
27" [--(enable|disable|allow-override|forbid-override)=<service>]\n"
28" [--inetd | [--listen=<host_or_ipaddr>] [--port=<n>]\n"
29" [--user=<user> [--group=<group>]]\n"
30" [<directory>...]";
31/* List of acceptable pathname prefixes */
33static char **ok_paths;
34static int strict_paths;
35/* If this is set, git-daemon-export-ok is not required */
37static int export_all_trees;
38/* Take all paths relative to this one if non-NULL */
40static char *base_path;
41static char *interpolated_path;
42static int base_path_relaxed;
43/* Flag indicating client sent extra args. */
45static int saw_extended_args;
46/* If defined, ~user notation is allowed and the string is inserted
48 * after ~user/. E.g. a request to git://host/~alice/frotz would
49 * go to /home/alice/pub_git/frotz with --user-path=pub_git.
50 */
51static const char *user_path;
52/* Timeout, and initial timeout */
54static unsigned int timeout;
55static unsigned int init_timeout;
56static char *hostname;
58static char *canon_hostname;
59static char *ip_address;
60static char *tcp_port;
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 buffered mode, the
71 * logging of different processes will not overlap
72 * unless they overflow the (rather big) buffers.
73 */
74 fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid());
75 vfprintf(stderr, err, params);
76 fputc('\n', stderr);
77 fflush(stderr);
78 }
79}
80__attribute__((format (printf, 1, 2)))
82static void logerror(const char *err, ...)
83{
84 va_list params;
85 va_start(params, err);
86 logreport(LOG_ERR, err, params);
87 va_end(params);
88}
89__attribute__((format (printf, 1, 2)))
91static void loginfo(const char *err, ...)
92{
93 va_list params;
94 if (!verbose)
95 return;
96 va_start(params, err);
97 logreport(LOG_INFO, err, params);
98 va_end(params);
99}
100static void NORETURN daemon_die(const char *err, va_list params)
102{
103 logreport(LOG_ERR, err, params);
104 exit(1);
105}
106static char *path_ok(char *directory)
108{
109 static char rpath[PATH_MAX];
110 static char interp_path[PATH_MAX];
111 char *path;
112 char *dir;
113 dir = directory;
115 if (daemon_avoid_alias(dir)) {
117 logerror("'%s': aliased", dir);
118 return NULL;
119 }
120 if (*dir == '~') {
122 if (!user_path) {
123 logerror("'%s': User-path not allowed", dir);
124 return NULL;
125 }
126 if (*user_path) {
127 /* Got either "~alice" or "~alice/foo";
128 * rewrite them to "~alice/%s" or
129 * "~alice/%s/foo".
130 */
131 int namlen, restlen = strlen(dir);
132 char *slash = strchr(dir, '/');
133 if (!slash)
134 slash = dir + restlen;
135 namlen = slash - dir;
136 restlen -= namlen;
137 loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
138 snprintf(rpath, PATH_MAX, "%.*s/%s%.*s",
139 namlen, dir, user_path, restlen, slash);
140 dir = rpath;
141 }
142 }
143 else if (interpolated_path && saw_extended_args) {
144 struct strbuf expanded_path = STRBUF_INIT;
145 struct strbuf_expand_dict_entry dict[6];
146 dict[0].placeholder = "H"; dict[0].value = hostname;
148 dict[1].placeholder = "CH"; dict[1].value = canon_hostname;
149 dict[2].placeholder = "IP"; dict[2].value = ip_address;
150 dict[3].placeholder = "P"; dict[3].value = tcp_port;
151 dict[4].placeholder = "D"; dict[4].value = directory;
152 dict[5].placeholder = NULL; dict[5].value = NULL;
153 if (*dir != '/') {
154 /* Allow only absolute */
155 logerror("'%s': Non-absolute path denied (interpolated-path active)", dir);
156 return NULL;
157 }
158 strbuf_expand(&expanded_path, interpolated_path,
160 strbuf_expand_dict_cb, &dict);
161 strlcpy(interp_path, expanded_path.buf, PATH_MAX);
162 strbuf_release(&expanded_path);
163 loginfo("Interpolated dir '%s'", interp_path);
164 dir = interp_path;
166 }
167 else if (base_path) {
168 if (*dir != '/') {
169 /* Allow only absolute */
170 logerror("'%s': Non-absolute path denied (base-path active)", dir);
171 return NULL;
172 }
173 snprintf(rpath, PATH_MAX, "%s%s", base_path, dir);
174 dir = rpath;
175 }
176 path = enter_repo(dir, strict_paths);
178 if (!path && base_path && base_path_relaxed) {
179 /*
180 * if we fail and base_path_relaxed is enabled, try without
181 * prefixing the base path
182 */
183 dir = directory;
184 path = enter_repo(dir, strict_paths);
185 }
186 if (!path) {
188 logerror("'%s' does not appear to be a git repository", dir);
189 return NULL;
190 }
191 if ( ok_paths && *ok_paths ) {
193 char **pp;
194 int pathlen = strlen(path);
195 /* The validation is done on the paths after enter_repo
197 * appends optional {.git,.git/.git} and friends, but
198 * it does not use getcwd(). So if your /pub is
199 * a symlink to /mnt/pub, you can whitelist /pub and
200 * do not have to say /mnt/pub.
201 * Do not say /pub/.
202 */
203 for ( pp = ok_paths ; *pp ; pp++ ) {
204 int len = strlen(*pp);
205 if (len <= pathlen &&
206 !memcmp(*pp, path, len) &&
207 (path[len] == '\0' ||
208 (!strict_paths && path[len] == '/')))
209 return path;
210 }
211 }
212 else {
213 /* be backwards compatible */
214 if (!strict_paths)
215 return path;
216 }
217 logerror("'%s': not in whitelist", path);
219 return NULL; /* Fallthrough. Deny by default */
220}
221typedef int (*daemon_service_fn)(void);
223struct daemon_service {
224 const char *name;
225 const char *config_name;
226 daemon_service_fn fn;
227 int enabled;
228 int overridable;
229};
230static struct daemon_service *service_looking_at;
232static int service_enabled;
233static int git_daemon_config(const char *var, const char *value, void *cb)
235{
236 if (!prefixcmp(var, "daemon.") &&
237 !strcmp(var + 7, service_looking_at->config_name)) {
238 service_enabled = git_config_bool(var, value);
239 return 0;
240 }
241 /* we are not interested in parsing any other configuration here */
243 return 0;
244}
245static int run_service(char *dir, struct daemon_service *service)
247{
248 const char *path;
249 int enabled = service->enabled;
250 loginfo("Request %s for '%s'", service->name, dir);
252 if (!enabled && !service->overridable) {
254 logerror("'%s': service not enabled.", service->name);
255 errno = EACCES;
256 return -1;
257 }
258 if (!(path = path_ok(dir)))
260 return -1;
261 /*
263 * Security on the cheap.
264 *
265 * We want a readable HEAD, usable "objects" directory, and
266 * a "git-daemon-export-ok" flag that says that the other side
267 * is ok with us doing this.
268 *
269 * path_ok() uses enter_repo() and does whitelist checking.
270 * We only need to make sure the repository is exported.
271 */
272 if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
274 logerror("'%s': repository not exported.", path);
275 errno = EACCES;
276 return -1;
277 }
278 if (service->overridable) {
280 service_looking_at = service;
281 service_enabled = -1;
282 git_config(git_daemon_config, NULL);
283 if (0 <= service_enabled)
284 enabled = service_enabled;
285 }
286 if (!enabled) {
287 logerror("'%s': service not enabled for '%s'",
288 service->name, path);
289 errno = EACCES;
290 return -1;
291 }
292 /*
294 * We'll ignore SIGTERM from now on, we have a
295 * good client.
296 */
297 signal(SIGTERM, SIG_IGN);
298 return service->fn();
300}
301static void copy_to_log(int fd)
303{
304 struct strbuf line = STRBUF_INIT;
305 FILE *fp;
306 fp = fdopen(fd, "r");
308 if (fp == NULL) {
309 logerror("fdopen of error channel failed");
310 close(fd);
311 return;
312 }
313 while (strbuf_getline(&line, fp, '\n') != EOF) {
315 logerror("%s", line.buf);
316 strbuf_setlen(&line, 0);
317 }
318 strbuf_release(&line);
320 fclose(fp);
321}
322static int run_service_command(const char **argv)
324{
325 struct child_process cld;
326 memset(&cld, 0, sizeof(cld));
328 cld.argv = argv;
329 cld.git_cmd = 1;
330 cld.err = -1;
331 if (start_command(&cld))
332 return -1;
333 close(0);
335 close(1);
336 copy_to_log(cld.err);
338 return finish_command(&cld);
340}
341static int upload_pack(void)
343{
344 /* Timeout as string */
345 char timeout_buf[64];
346 const char *argv[] = { "upload-pack", "--strict", NULL, ".", NULL };
347 argv[2] = timeout_buf;
349 snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout);
351 return run_service_command(argv);
352}
353static int upload_archive(void)
355{
356 static const char *argv[] = { "upload-archive", ".", NULL };
357 return run_service_command(argv);
358}
359static int receive_pack(void)
361{
362 static const char *argv[] = { "receive-pack", ".", NULL };
363 return run_service_command(argv);
364}
365static struct daemon_service daemon_service[] = {
367 { "upload-archive", "uploadarch", upload_archive, 0, 1 },
368 { "upload-pack", "uploadpack", upload_pack, 1, 1 },
369 { "receive-pack", "receivepack", receive_pack, 0, 1 },
370};
371static void enable_service(const char *name, int ena)
373{
374 int i;
375 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
376 if (!strcmp(daemon_service[i].name, name)) {
377 daemon_service[i].enabled = ena;
378 return;
379 }
380 }
381 die("No such service %s", name);
382}
383static void make_service_overridable(const char *name, int ena)
385{
386 int i;
387 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
388 if (!strcmp(daemon_service[i].name, name)) {
389 daemon_service[i].overridable = ena;
390 return;
391 }
392 }
393 die("No such service %s", name);
394}
395static char *xstrdup_tolower(const char *str)
397{
398 char *p, *dup = xstrdup(str);
399 for (p = dup; *p; p++)
400 *p = tolower(*p);
401 return dup;
402}
403static void parse_host_and_port(char *hostport, char **host,
405 char **port)
406{
407 if (*hostport == '[') {
408 char *end;
409 end = strchr(hostport, ']');
411 if (!end)
412 die("Invalid request ('[' without ']')");
413 *end = '\0';
414 *host = hostport + 1;
415 if (!end[1])
416 *port = NULL;
417 else if (end[1] == ':')
418 *port = end + 2;
419 else
420 die("Garbage after end of host part");
421 } else {
422 *host = hostport;
423 *port = strrchr(hostport, ':');
424 if (*port) {
425 **port = '\0';
426 ++*port;
427 }
428 }
429}
430/*
432 * Read the host as supplied by the client connection.
433 */
434static void parse_host_arg(char *extra_args, int buflen)
435{
436 char *val;
437 int vallen;
438 char *end = extra_args + buflen;
439 if (extra_args < end && *extra_args) {
441 saw_extended_args = 1;
442 if (strncasecmp("host=", extra_args, 5) == 0) {
443 val = extra_args + 5;
444 vallen = strlen(val) + 1;
445 if (*val) {
446 /* Split <host>:<port> at colon. */
447 char *host;
448 char *port;
449 parse_host_and_port(val, &host, &port);
450 if (port) {
451 free(tcp_port);
452 tcp_port = xstrdup(port);
453 }
454 free(hostname);
455 hostname = xstrdup_tolower(host);
456 }
457 /* On to the next one */
459 extra_args = val + vallen;
460 }
461 if (extra_args < end && *extra_args)
462 die("Invalid request");
463 }
464 /*
466 * Locate canonical hostname and its IP address.
467 */
468 if (hostname) {
469#ifndef NO_IPV6
470 struct addrinfo hints;
471 struct addrinfo *ai;
472 int gai;
473 static char addrbuf[HOST_NAME_MAX + 1];
474 memset(&hints, 0, sizeof(hints));
476 hints.ai_flags = AI_CANONNAME;
477 gai = getaddrinfo(hostname, NULL, &hints, &ai);
479 if (!gai) {
480 struct sockaddr_in *sin_addr = (void *)ai->ai_addr;
481 inet_ntop(AF_INET, &sin_addr->sin_addr,
483 addrbuf, sizeof(addrbuf));
484 free(ip_address);
485 ip_address = xstrdup(addrbuf);
486 free(canon_hostname);
488 canon_hostname = xstrdup(ai->ai_canonname ?
489 ai->ai_canonname : ip_address);
490 freeaddrinfo(ai);
492 }
493#else
494 struct hostent *hent;
495 struct sockaddr_in sa;
496 char **ap;
497 static char addrbuf[HOST_NAME_MAX + 1];
498 hent = gethostbyname(hostname);
500 ap = hent->h_addr_list;
502 memset(&sa, 0, sizeof sa);
503 sa.sin_family = hent->h_addrtype;
504 sa.sin_port = htons(0);
505 memcpy(&sa.sin_addr, *ap, hent->h_length);
506 inet_ntop(hent->h_addrtype, &sa.sin_addr,
508 addrbuf, sizeof(addrbuf));
509 free(canon_hostname);
511 canon_hostname = xstrdup(hent->h_name);
512 free(ip_address);
513 ip_address = xstrdup(addrbuf);
514#endif
515 }
516}
517static int execute(struct sockaddr *addr)
520{
521 static char line[1000];
522 int pktlen, len, i;
523 if (addr) {
525 char addrbuf[256] = "";
526 int port = -1;
527 if (addr->sa_family == AF_INET) {
529 struct sockaddr_in *sin_addr = (void *) addr;
530 inet_ntop(addr->sa_family, &sin_addr->sin_addr, addrbuf, sizeof(addrbuf));
531 port = ntohs(sin_addr->sin_port);
532#ifndef NO_IPV6
533 } else if (addr && addr->sa_family == AF_INET6) {
534 struct sockaddr_in6 *sin6_addr = (void *) addr;
535 char *buf = addrbuf;
537 *buf++ = '['; *buf = '\0'; /* stpcpy() is cool */
538 inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(addrbuf) - 1);
539 strcat(buf, "]");
540 port = ntohs(sin6_addr->sin6_port);
542#endif
543 }
544 loginfo("Connection from %s:%d", addrbuf, port);
545 setenv("REMOTE_ADDR", addrbuf, 1);
546 }
547 else {
548 unsetenv("REMOTE_ADDR");
549 }
550 alarm(init_timeout ? init_timeout : timeout);
552 pktlen = packet_read_line(0, line, sizeof(line));
553 alarm(0);
554 len = strlen(line);
556 if (pktlen != len)
557 loginfo("Extended attributes (%d bytes) exist <%.*s>",
558 (int) pktlen - len,
559 (int) pktlen - len, line + len + 1);
560 if (len && line[len-1] == '\n') {
561 line[--len] = 0;
562 pktlen--;
563 }
564 free(hostname);
566 free(canon_hostname);
567 free(ip_address);
568 free(tcp_port);
569 hostname = canon_hostname = ip_address = tcp_port = NULL;
570 if (len != pktlen)
572 parse_host_arg(line + len + 1, pktlen - len - 1);
573 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
575 struct daemon_service *s = &(daemon_service[i]);
576 int namelen = strlen(s->name);
577 if (!prefixcmp(line, "git-") &&
578 !strncmp(s->name, line + 4, namelen) &&
579 line[namelen + 4] == ' ') {
580 /*
581 * Note: The directory here is probably context sensitive,
582 * and might depend on the actual service being performed.
583 */
584 return run_service(line + namelen + 5, s);
585 }
586 }
587 logerror("Protocol error: '%s'", line);
589 return -1;
590}
591static int addrcmp(const struct sockaddr_storage *s1,
593 const struct sockaddr_storage *s2)
594{
595 const struct sockaddr *sa1 = (const struct sockaddr*) s1;
596 const struct sockaddr *sa2 = (const struct sockaddr*) s2;
597 if (sa1->sa_family != sa2->sa_family)
599 return sa1->sa_family - sa2->sa_family;
600 if (sa1->sa_family == AF_INET)
601 return memcmp(&((struct sockaddr_in *)s1)->sin_addr,
602 &((struct sockaddr_in *)s2)->sin_addr,
603 sizeof(struct in_addr));
604#ifndef NO_IPV6
605 if (sa1->sa_family == AF_INET6)
606 return memcmp(&((struct sockaddr_in6 *)s1)->sin6_addr,
607 &((struct sockaddr_in6 *)s2)->sin6_addr,
608 sizeof(struct in6_addr));
609#endif
610 return 0;
611}
612static int max_connections = 32;
614static unsigned int live_children;
616static struct child {
618 struct child *next;
619 struct child_process cld;
620 struct sockaddr_storage address;
621} *firstborn;
622static void add_child(struct child_process *cld, struct sockaddr *addr, int addrlen)
624{
625 struct child *newborn, **cradle;
626 newborn = xcalloc(1, sizeof(*newborn));
628 live_children++;
629 memcpy(&newborn->cld, cld, sizeof(*cld));
630 memcpy(&newborn->address, addr, addrlen);
631 for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next)
632 if (!addrcmp(&(*cradle)->address, &newborn->address))
633 break;
634 newborn->next = *cradle;
635 *cradle = newborn;
636}
637/*
639 * This gets called if the number of connections grows
640 * past "max_connections".
641 *
642 * We kill the newest connection from a duplicate IP.
643 */
644static void kill_some_child(void)
645{
646 const struct child *blanket, *next;
647 if (!(blanket = firstborn))
649 return;
650 for (; (next = blanket->next); blanket = next)
652 if (!addrcmp(&blanket->address, &next->address)) {
653 kill(blanket->cld.pid, SIGTERM);
654 break;
655 }
656}
657static void check_dead_children(void)
659{
660 int status;
661 pid_t pid;
662 struct child **cradle, *blanket;
664 for (cradle = &firstborn; (blanket = *cradle);)
665 if ((pid = waitpid(blanket->cld.pid, &status, WNOHANG)) > 1) {
666 const char *dead = "";
667 if (status)
668 dead = " (with error)";
669 loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead);
670 /* remove the child */
672 *cradle = blanket->next;
673 live_children--;
674 free(blanket);
675 } else
676 cradle = &blanket->next;
677}
678static char **cld_argv;
680static void handle(int incoming, struct sockaddr *addr, int addrlen)
681{
682 struct child_process cld = { 0 };
683 if (max_connections && live_children >= max_connections) {
685 kill_some_child();
686 sleep(1); /* give it some time to die */
687 check_dead_children();
688 if (live_children >= max_connections) {
689 close(incoming);
690 logerror("Too many children, dropping connection");
691 return;
692 }
693 }
694 cld.argv = (const char **)cld_argv;
696 cld.in = incoming;
697 cld.out = dup(incoming);
698 if (start_command(&cld))
700 logerror("unable to fork");
701 else
702 add_child(&cld, addr, addrlen);
703 close(incoming);
704}
705static void child_handler(int signo)
707{
708 /*
709 * Otherwise empty handler because systemcalls will get interrupted
710 * upon signal receipt
711 * SysV needs the handler to be rearmed
712 */
713 signal(SIGCHLD, child_handler);
714}
715static int set_reuse_addr(int sockfd)
717{
718 int on = 1;
719 if (!reuseaddr)
721 return 0;
722 return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
723 &on, sizeof(on));
724}
725struct socketlist {
727 int *list;
728 size_t nr;
729 size_t alloc;
730};
731#ifndef NO_IPV6
733static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
735{
736 int socknum = 0;
737 int maxfd = -1;
738 char pbuf[NI_MAXSERV];
739 struct addrinfo hints, *ai0, *ai;
740 int gai;
741 long flags;
742 sprintf(pbuf, "%d", listen_port);
744 memset(&hints, 0, sizeof(hints));
745 hints.ai_family = AF_UNSPEC;
746 hints.ai_socktype = SOCK_STREAM;
747 hints.ai_protocol = IPPROTO_TCP;
748 hints.ai_flags = AI_PASSIVE;
749 gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0);
751 if (gai) {
752 logerror("getaddrinfo() for %s failed: %s", listen_addr, gai_strerror(gai));
753 return 0;
754 }
755 for (ai = ai0; ai; ai = ai->ai_next) {
757 int sockfd;
758 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
760 if (sockfd < 0)
761 continue;
762 if (sockfd >= FD_SETSIZE) {
763 logerror("Socket descriptor too large");
764 close(sockfd);
765 continue;
766 }
767#ifdef IPV6_V6ONLY
769 if (ai->ai_family == AF_INET6) {
770 int on = 1;
771 setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
772 &on, sizeof(on));
773 /* Note: error is not fatal */
774 }
775#endif
776 if (set_reuse_addr(sockfd)) {
778 close(sockfd);
779 continue;
780 }
781 if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
783 close(sockfd);
784 continue; /* not fatal */
785 }
786 if (listen(sockfd, 5) < 0) {
787 close(sockfd);
788 continue; /* not fatal */
789 }
790 flags = fcntl(sockfd, F_GETFD, 0);
792 if (flags >= 0)
793 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
794 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
796 socklist->list[socklist->nr++] = sockfd;
797 socknum++;
798 if (maxfd < sockfd)
800 maxfd = sockfd;
801 }
802 freeaddrinfo(ai0);
804 return socknum;
806}
807#else /* NO_IPV6 */
809static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
811{
812 struct sockaddr_in sin;
813 int sockfd;
814 long flags;
815 memset(&sin, 0, sizeof sin);
817 sin.sin_family = AF_INET;
818 sin.sin_port = htons(listen_port);
819 if (listen_addr) {
821 /* Well, host better be an IP address here. */
822 if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0)
823 return 0;
824 } else {
825 sin.sin_addr.s_addr = htonl(INADDR_ANY);
826 }
827 sockfd = socket(AF_INET, SOCK_STREAM, 0);
829 if (sockfd < 0)
830 return 0;
831 if (set_reuse_addr(sockfd)) {
833 close(sockfd);
834 return 0;
835 }
836 if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
838 close(sockfd);
839 return 0;
840 }
841 if (listen(sockfd, 5) < 0) {
843 close(sockfd);
844 return 0;
845 }
846 flags = fcntl(sockfd, F_GETFD, 0);
848 if (flags >= 0)
849 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
850 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
852 socklist->list[socklist->nr++] = sockfd;
853 return 1;
854}
855#endif
857static void socksetup(struct string_list *listen_addr, int listen_port, struct socketlist *socklist)
859{
860 if (!listen_addr->nr)
861 setup_named_sock(NULL, listen_port, socklist);
862 else {
863 int i, socknum;
864 for (i = 0; i < listen_addr->nr; i++) {
865 socknum = setup_named_sock(listen_addr->items[i].string,
866 listen_port, socklist);
867 if (socknum == 0)
869 logerror("unable to allocate any listen sockets for host %s on port %u",
870 listen_addr->items[i].string, listen_port);
871 }
872 }
873}
874static int service_loop(struct socketlist *socklist)
876{
877 struct pollfd *pfd;
878 int i;
879 pfd = xcalloc(socklist->nr, sizeof(struct pollfd));
881 for (i = 0; i < socklist->nr; i++) {
883 pfd[i].fd = socklist->list[i];
884 pfd[i].events = POLLIN;
885 }
886 signal(SIGCHLD, child_handler);
888 for (;;) {
890 int i;
891 check_dead_children();
893 if (poll(pfd, socklist->nr, -1) < 0) {
895 if (errno != EINTR) {
896 logerror("Poll failed, resuming: %s",
897 strerror(errno));
898 sleep(1);
899 }
900 continue;
901 }
902 for (i = 0; i < socklist->nr; i++) {
904 if (pfd[i].revents & POLLIN) {
905 struct sockaddr_storage ss;
906 unsigned int sslen = sizeof(ss);
907 int incoming = accept(pfd[i].fd, (struct sockaddr *)&ss, &sslen);
908 if (incoming < 0) {
909 switch (errno) {
910 case EAGAIN:
911 case EINTR:
912 case ECONNABORTED:
913 continue;
914 default:
915 die_errno("accept returned");
916 }
917 }
918 handle(incoming, (struct sockaddr *)&ss, sslen);
919 }
920 }
921 }
922}
923/* if any standard file descriptor is missing open it to /dev/null */
925static void sanitize_stdfds(void)
926{
927 int fd = open("/dev/null", O_RDWR, 0);
928 while (fd != -1 && fd < 2)
929 fd = dup(fd);
930 if (fd == -1)
931 die_errno("open /dev/null or dup failed");
932 if (fd > 2)
933 close(fd);
934}
935static void daemonize(void)
937{
938 switch (fork()) {
939 case 0:
940 break;
941 case -1:
942 die_errno("fork failed");
943 default:
944 exit(0);
945 }
946 if (setsid() == -1)
947 die_errno("setsid failed");
948 close(0);
949 close(1);
950 close(2);
951 sanitize_stdfds();
952}
953static void store_pid(const char *path)
955{
956 FILE *f = fopen(path, "w");
957 if (!f)
958 die_errno("cannot open pid file '%s'", path);
959 if (fprintf(f, "%"PRIuMAX"\n", (uintmax_t) getpid()) < 0 || fclose(f) != 0)
960 die_errno("failed to write pid file '%s'", path);
961}
962static int serve(struct string_list *listen_addr, int listen_port, struct passwd *pass, gid_t gid)
964{
965 struct socketlist socklist = { NULL, 0, 0 };
966 socksetup(listen_addr, listen_port, &socklist);
968 if (socklist.nr == 0)
969 die("unable to allocate any listen sockets on port %u",
970 listen_port);
971 if (pass && gid &&
973 (initgroups(pass->pw_name, gid) || setgid (gid) ||
974 setuid(pass->pw_uid)))
975 die("cannot drop privileges");
976 return service_loop(&socklist);
978}
979int main(int argc, char **argv)
981{
982 int listen_port = 0;
983 struct string_list listen_addr = STRING_LIST_INIT_NODUP;
984 int serve_mode = 0, inetd_mode = 0;
985 const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
986 int detach = 0;
987 struct passwd *pass = NULL;
988 struct group *group;
989 gid_t gid = 0;
990 int i;
991 git_extract_argv0_path(argv[0]);
993 for (i = 1; i < argc; i++) {
995 char *arg = argv[i];
996 if (!prefixcmp(arg, "--listen=")) {
998 string_list_append(&listen_addr, xstrdup_tolower(arg + 9));
999 continue;
1000 }
1001 if (!prefixcmp(arg, "--port=")) {
1002 char *end;
1003 unsigned long n;
1004 n = strtoul(arg+7, &end, 0);
1005 if (arg[7] && !*end) {
1006 listen_port = n;
1007 continue;
1008 }
1009 }
1010 if (!strcmp(arg, "--serve")) {
1011 serve_mode = 1;
1012 continue;
1013 }
1014 if (!strcmp(arg, "--inetd")) {
1015 inetd_mode = 1;
1016 log_syslog = 1;
1017 continue;
1018 }
1019 if (!strcmp(arg, "--verbose")) {
1020 verbose = 1;
1021 continue;
1022 }
1023 if (!strcmp(arg, "--syslog")) {
1024 log_syslog = 1;
1025 continue;
1026 }
1027 if (!strcmp(arg, "--export-all")) {
1028 export_all_trees = 1;
1029 continue;
1030 }
1031 if (!prefixcmp(arg, "--timeout=")) {
1032 timeout = atoi(arg+10);
1033 continue;
1034 }
1035 if (!prefixcmp(arg, "--init-timeout=")) {
1036 init_timeout = atoi(arg+15);
1037 continue;
1038 }
1039 if (!prefixcmp(arg, "--max-connections=")) {
1040 max_connections = atoi(arg+18);
1041 if (max_connections < 0)
1042 max_connections = 0; /* unlimited */
1043 continue;
1044 }
1045 if (!strcmp(arg, "--strict-paths")) {
1046 strict_paths = 1;
1047 continue;
1048 }
1049 if (!prefixcmp(arg, "--base-path=")) {
1050 base_path = arg+12;
1051 continue;
1052 }
1053 if (!strcmp(arg, "--base-path-relaxed")) {
1054 base_path_relaxed = 1;
1055 continue;
1056 }
1057 if (!prefixcmp(arg, "--interpolated-path=")) {
1058 interpolated_path = arg+20;
1059 continue;
1060 }
1061 if (!strcmp(arg, "--reuseaddr")) {
1062 reuseaddr = 1;
1063 continue;
1064 }
1065 if (!strcmp(arg, "--user-path")) {
1066 user_path = "";
1067 continue;
1068 }
1069 if (!prefixcmp(arg, "--user-path=")) {
1070 user_path = arg + 12;
1071 continue;
1072 }
1073 if (!prefixcmp(arg, "--pid-file=")) {
1074 pid_file = arg + 11;
1075 continue;
1076 }
1077 if (!strcmp(arg, "--detach")) {
1078 detach = 1;
1079 log_syslog = 1;
1080 continue;
1081 }
1082 if (!prefixcmp(arg, "--user=")) {
1083 user_name = arg + 7;
1084 continue;
1085 }
1086 if (!prefixcmp(arg, "--group=")) {
1087 group_name = arg + 8;
1088 continue;
1089 }
1090 if (!prefixcmp(arg, "--enable=")) {
1091 enable_service(arg + 9, 1);
1092 continue;
1093 }
1094 if (!prefixcmp(arg, "--disable=")) {
1095 enable_service(arg + 10, 0);
1096 continue;
1097 }
1098 if (!prefixcmp(arg, "--allow-override=")) {
1099 make_service_overridable(arg + 17, 1);
1100 continue;
1101 }
1102 if (!prefixcmp(arg, "--forbid-override=")) {
1103 make_service_overridable(arg + 18, 0);
1104 continue;
1105 }
1106 if (!strcmp(arg, "--")) {
1107 ok_paths = &argv[i+1];
1108 break;
1109 } else if (arg[0] != '-') {
1110 ok_paths = &argv[i];
1111 break;
1112 }
1113 usage(daemon_usage);
1115 }
1116 if (log_syslog) {
1118 openlog("git-daemon", LOG_PID, LOG_DAEMON);
1119 set_die_routine(daemon_die);
1120 } else
1121 /* avoid splitting a message in the middle */
1122 setvbuf(stderr, NULL, _IOFBF, 4096);
1123 if (inetd_mode && (group_name || user_name))
1125 die("--user and --group are incompatible with --inetd");
1126 if (inetd_mode && (listen_port || (listen_addr.nr > 0)))
1128 die("--listen= and --port= are incompatible with --inetd");
1129 else if (listen_port == 0)
1130 listen_port = DEFAULT_GIT_PORT;
1131 if (group_name && !user_name)
1133 die("--group supplied without --user");
1134 if (user_name) {
1136 pass = getpwnam(user_name);
1137 if (!pass)
1138 die("user not found - %s", user_name);
1139 if (!group_name)
1141 gid = pass->pw_gid;
1142 else {
1143 group = getgrnam(group_name);
1144 if (!group)
1145 die("group not found - %s", group_name);
1146 gid = group->gr_gid;
1148 }
1149 }
1150 if (strict_paths && (!ok_paths || !*ok_paths))
1152 die("option --strict-paths requires a whitelist");
1153 if (base_path && !is_directory(base_path))
1155 die("base-path '%s' does not exist or is not a directory",
1156 base_path);
1157 if (inetd_mode) {
1159 if (!freopen("/dev/null", "w", stderr))
1160 die_errno("failed to redirect stderr to /dev/null");
1161 }
1162 if (inetd_mode || serve_mode) {
1164 struct sockaddr_storage ss;
1165 struct sockaddr *peer = (struct sockaddr *)&ss;
1166 socklen_t slen = sizeof(ss);
1167 if (getpeername(0, peer, &slen))
1169 return execute(NULL);
1170 else
1171 return execute(peer);
1172 }
1173 if (detach) {
1175 daemonize();
1176 loginfo("Ready to rumble");
1177 }
1178 else
1179 sanitize_stdfds();
1180 if (pid_file)
1182 store_pid(pid_file);
1183 /* prepare argv for serving-processes */
1185 cld_argv = xmalloc(sizeof (char *) * (argc + 2));
1186 for (i = 0; i < argc; ++i)
1187 cld_argv[i] = argv[i];
1188 cld_argv[argc] = "--serve";
1189 cld_argv[argc+1] = NULL;
1190 return serve(&listen_addr, listen_port, pass, gid);
1192}