Add git-zip-tree to .gitignore
[git/git.git] / daemon.c
CommitLineData
eaa94919
LT
1#include <signal.h>
2#include <sys/wait.h>
a87e8be2 3#include <sys/socket.h>
3cd6ecda 4#include <sys/time.h>
6573faff 5#include <sys/poll.h>
df076bdb 6#include <netdb.h>
a87e8be2 7#include <netinet/in.h>
f8ff0c06 8#include <arpa/inet.h>
9048fe1c 9#include <syslog.h>
678dac6b
TS
10#include <pwd.h>
11#include <grp.h>
979e32fa
RS
12#include "pkt-line.h"
13#include "cache.h"
77cb17e9 14#include "exec_cmd.h"
f8ff0c06 15
9048fe1c 16static int log_syslog;
f8ff0c06 17static int verbose;
1955fabf 18static int reuseaddr;
f8ff0c06 19
960deccb
PA
20static const char daemon_usage[] =
21"git-daemon [--verbose] [--syslog] [--inetd | --port=n] [--export-all]\n"
b21c31c9 22" [--timeout=n] [--init-timeout=n] [--strict-paths]\n"
603968d2 23" [--base-path=path] [--user-path | --user-path=path]\n"
678dac6b
TS
24" [--reuseaddr] [--detach] [--pid-file=file]\n"
25" [--user=user [[--group=group]] [directory...]";
4ae95682
PA
26
27/* List of acceptable pathname prefixes */
96f1e58f
DR
28static char **ok_paths;
29static int strict_paths;
4ae95682
PA
30
31/* If this is set, git-daemon-export-ok is not required */
96f1e58f 32static int export_all_trees;
f8ff0c06 33
b21c31c9 34/* Take all paths relative to this one if non-NULL */
96f1e58f 35static char *base_path;
b21c31c9 36
603968d2
JH
37/* If defined, ~user notation is allowed and the string is inserted
38 * after ~user/. E.g. a request to git://host/~alice/frotz would
39 * go to /home/alice/pub_git/frotz with --user-path=pub_git.
40 */
96f1e58f 41static const char *user_path;
603968d2 42
960deccb 43/* Timeout, and initial timeout */
96f1e58f
DR
44static unsigned int timeout;
45static unsigned int init_timeout;
f8ff0c06 46
9048fe1c 47static void logreport(int priority, const char *err, va_list params)
f8ff0c06
PB
48{
49 /* We should do a single write so that it is atomic and output
50 * of several processes do not get intermingled. */
51 char buf[1024];
52 int buflen;
53 int maxlen, msglen;
54
55 /* sizeof(buf) should be big enough for "[pid] \n" */
1bedd4ca 56 buflen = snprintf(buf, sizeof(buf), "[%ld] ", (long) getpid());
f8ff0c06
PB
57
58 maxlen = sizeof(buf) - buflen - 1; /* -1 for our own LF */
59 msglen = vsnprintf(buf + buflen, maxlen, err, params);
60
9048fe1c
PB
61 if (log_syslog) {
62 syslog(priority, "%s", buf);
63 return;
64 }
65
f8ff0c06
PB
66 /* maxlen counted our own LF but also counts space given to
67 * vsnprintf for the terminating NUL. We want to make sure that
68 * we have space for our own LF and NUL after the "meat" of the
69 * message, so truncate it at maxlen - 1.
70 */
71 if (msglen > maxlen - 1)
72 msglen = maxlen - 1;
73 else if (msglen < 0)
74 msglen = 0; /* Protect against weird return values. */
75 buflen += msglen;
76
77 buf[buflen++] = '\n';
78 buf[buflen] = '\0';
79
80 write(2, buf, buflen);
81}
82
cdda4745 83static void logerror(const char *err, ...)
f8ff0c06
PB
84{
85 va_list params;
86 va_start(params, err);
9048fe1c 87 logreport(LOG_ERR, err, params);
f8ff0c06
PB
88 va_end(params);
89}
90
cdda4745 91static void loginfo(const char *err, ...)
f8ff0c06
PB
92{
93 va_list params;
94 if (!verbose)
95 return;
96 va_start(params, err);
9048fe1c 97 logreport(LOG_INFO, err, params);
f8ff0c06
PB
98 va_end(params);
99}
a87e8be2 100
ad8b4f56
ML
101static void NORETURN daemon_die(const char *err, va_list params)
102{
103 logreport(LOG_ERR, err, params);
104 exit(1);
105}
106
d79374c7
JH
107static int avoid_alias(char *p)
108{
109 int sl, ndot;
110
111 /*
112 * This resurrects the belts and suspenders paranoia check by HPA
113 * done in <435560F7.4080006@zytor.com> thread, now enter_repo()
114 * does not do getcwd() based path canonicalizations.
115 *
116 * sl becomes true immediately after seeing '/' and continues to
117 * be true as long as dots continue after that without intervening
118 * non-dot character.
119 */
120 if (!p || (*p != '/' && *p != '~'))
121 return -1;
122 sl = 1; ndot = 0;
123 p++;
124
125 while (1) {
126 char ch = *p++;
127 if (sl) {
128 if (ch == '.')
129 ndot++;
130 else if (ch == '/') {
131 if (ndot < 3)
132 /* reject //, /./ and /../ */
133 return -1;
134 ndot = 0;
135 }
136 else if (ch == 0) {
137 if (0 < ndot && ndot < 3)
138 /* reject /.$ and /..$ */
139 return -1;
140 return 0;
141 }
142 else
143 sl = ndot = 0;
144 }
145 else if (ch == 0)
146 return 0;
147 else if (ch == '/') {
148 sl = 1;
149 ndot = 0;
150 }
151 }
152}
153
4dbd1352 154static char *path_ok(char *dir)
4ae95682 155{
603968d2 156 static char rpath[PATH_MAX];
d79374c7
JH
157 char *path;
158
159 if (avoid_alias(dir)) {
160 logerror("'%s': aliased", dir);
161 return NULL;
162 }
163
603968d2
JH
164 if (*dir == '~') {
165 if (!user_path) {
166 logerror("'%s': User-path not allowed", dir);
167 return NULL;
168 }
169 if (*user_path) {
170 /* Got either "~alice" or "~alice/foo";
171 * rewrite them to "~alice/%s" or
172 * "~alice/%s/foo".
173 */
174 int namlen, restlen = strlen(dir);
175 char *slash = strchr(dir, '/');
176 if (!slash)
177 slash = dir + restlen;
178 namlen = slash - dir;
179 restlen -= namlen;
180 loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
181 snprintf(rpath, PATH_MAX, "%.*s/%s%.*s",
182 namlen, dir, user_path, restlen, slash);
183 dir = rpath;
184 }
185 }
186 else if (base_path) {
187 if (*dir != '/') {
188 /* Allow only absolute */
1fda3d55 189 logerror("'%s': Non-absolute path denied (base-path active)", dir);
b21c31c9
PB
190 return NULL;
191 }
363f24c9
JH
192 else {
193 snprintf(rpath, PATH_MAX, "%s%s", base_path, dir);
194 dir = rpath;
195 }
b21c31c9
PB
196 }
197
d79374c7 198 path = enter_repo(dir, strict_paths);
3e04c62d 199
4dbd1352
AE
200 if (!path) {
201 logerror("'%s': unable to chdir or not a git archive", dir);
202 return NULL;
4ae95682
PA
203 }
204
205 if ( ok_paths && *ok_paths ) {
ce335fe0 206 char **pp;
4dbd1352 207 int pathlen = strlen(path);
4ae95682 208
ce335fe0 209 /* The validation is done on the paths after enter_repo
d79374c7
JH
210 * appends optional {.git,.git/.git} and friends, but
211 * it does not use getcwd(). So if your /pub is
212 * a symlink to /mnt/pub, you can whitelist /pub and
213 * do not have to say /mnt/pub.
214 * Do not say /pub/.
ce335fe0 215 */
4ae95682
PA
216 for ( pp = ok_paths ; *pp ; pp++ ) {
217 int len = strlen(*pp);
ce335fe0
JH
218 if (len <= pathlen &&
219 !memcmp(*pp, path, len) &&
220 (path[len] == '\0' ||
221 (!strict_paths && path[len] == '/')))
222 return path;
4ae95682 223 }
4dbd1352
AE
224 }
225 else {
226 /* be backwards compatible */
227 if (!strict_paths)
228 return path;
4ae95682
PA
229 }
230
4dbd1352
AE
231 logerror("'%s': not in whitelist", path);
232 return NULL; /* Fallthrough. Deny by default */
4ae95682 233}
a87e8be2 234
4dbd1352 235static int upload(char *dir)
a87e8be2 236{
4dbd1352
AE
237 /* Timeout as string */
238 char timeout_buf[64];
239 const char *path;
240
241 loginfo("Request for '%s'", dir);
4ae95682 242
4dbd1352 243 if (!(path = path_ok(dir)))
a87e8be2 244 return -1;
47888f0f 245
a87e8be2
LT
246 /*
247 * Security on the cheap.
248 *
a935c397 249 * We want a readable HEAD, usable "objects" directory, and
a87e8be2
LT
250 * a "git-daemon-export-ok" flag that says that the other side
251 * is ok with us doing this.
4dbd1352
AE
252 *
253 * path_ok() uses enter_repo() and does whitelist checking.
254 * We only need to make sure the repository is exported.
a87e8be2 255 */
4dbd1352 256
3e04c62d 257 if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
4dbd1352 258 logerror("'%s': repository not exported.", path);
3e04c62d
PA
259 errno = EACCES;
260 return -1;
261 }
262
02d57da4
LT
263 /*
264 * We'll ignore SIGTERM from now on, we have a
265 * good client.
266 */
267 signal(SIGTERM, SIG_IGN);
268
960deccb
PA
269 snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout);
270
a87e8be2 271 /* git-upload-pack only ever reads stuff, so this is safe */
77cb17e9 272 execl_git_cmd("upload-pack", "--strict", timeout_buf, ".", NULL);
a87e8be2
LT
273 return -1;
274}
275
5b276ee4 276static int execute(struct sockaddr *addr)
a87e8be2 277{
7d80694a 278 static char line[1000];
5ad312be 279 int pktlen, len;
7d80694a 280
5b276ee4
DW
281 if (addr) {
282 char addrbuf[256] = "";
283 int port = -1;
284
285 if (addr->sa_family == AF_INET) {
286 struct sockaddr_in *sin_addr = (void *) addr;
287 inet_ntop(addr->sa_family, &sin_addr->sin_addr, addrbuf, sizeof(addrbuf));
288 port = sin_addr->sin_port;
289#ifndef NO_IPV6
290 } else if (addr && addr->sa_family == AF_INET6) {
291 struct sockaddr_in6 *sin6_addr = (void *) addr;
292
293 char *buf = addrbuf;
294 *buf++ = '['; *buf = '\0'; /* stpcpy() is cool */
295 inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(addrbuf) - 1);
296 strcat(buf, "]");
297
298 port = sin6_addr->sin6_port;
299#endif
300 }
301 loginfo("Connection from %s:%d", addrbuf, port);
302 }
303
960deccb 304 alarm(init_timeout ? init_timeout : timeout);
5ad312be 305 pktlen = packet_read_line(0, line, sizeof(line));
960deccb 306 alarm(0);
7d80694a 307
5ad312be
JL
308 len = strlen(line);
309 if (pktlen != len)
310 loginfo("Extended attributes (%d bytes) exist <%.*s>",
311 (int) pktlen - len,
312 (int) pktlen - len, line + len + 1);
7d80694a
LT
313 if (len && line[len-1] == '\n')
314 line[--len] = 0;
315
4dbd1352 316 if (!strncmp("git-upload-pack ", line, 16))
3e04c62d 317 return upload(line+16);
a87e8be2 318
f8ff0c06 319 logerror("Protocol error: '%s'", line);
a87e8be2
LT
320 return -1;
321}
322
66e631de
LT
323
324/*
325 * We count spawned/reaped separately, just to avoid any
326 * races when updating them from signals. The SIGCHLD handler
327 * will only update children_reaped, and the fork logic will
328 * only update children_spawned.
329 *
330 * MAX_CHILDREN should be a power-of-two to make the modulus
331 * operation cheap. It should also be at least twice
332 * the maximum number of connections we will ever allow.
333 */
334#define MAX_CHILDREN 128
335
336static int max_connections = 25;
337
338/* These are updated by the signal handler */
96f1e58f 339static volatile unsigned int children_reaped;
4d8fa916 340static pid_t dead_child[MAX_CHILDREN];
66e631de
LT
341
342/* These are updated by the main loop */
96f1e58f
DR
343static unsigned int children_spawned;
344static unsigned int children_deleted;
66e631de 345
4d8fa916 346static struct child {
66e631de 347 pid_t pid;
7fa09084 348 int addrlen;
df076bdb 349 struct sockaddr_storage address;
66e631de
LT
350} live_child[MAX_CHILDREN];
351
7fa09084 352static void add_child(int idx, pid_t pid, struct sockaddr *addr, int addrlen)
66e631de
LT
353{
354 live_child[idx].pid = pid;
355 live_child[idx].addrlen = addrlen;
df076bdb 356 memcpy(&live_child[idx].address, addr, addrlen);
66e631de
LT
357}
358
359/*
360 * Walk from "deleted" to "spawned", and remove child "pid".
361 *
362 * We move everything up by one, since the new "deleted" will
363 * be one higher.
364 */
365static void remove_child(pid_t pid, unsigned deleted, unsigned spawned)
366{
367 struct child n;
368
369 deleted %= MAX_CHILDREN;
370 spawned %= MAX_CHILDREN;
371 if (live_child[deleted].pid == pid) {
372 live_child[deleted].pid = -1;
373 return;
374 }
375 n = live_child[deleted];
376 for (;;) {
377 struct child m;
378 deleted = (deleted + 1) % MAX_CHILDREN;
379 if (deleted == spawned)
380 die("could not find dead child %d\n", pid);
381 m = live_child[deleted];
382 live_child[deleted] = n;
383 if (m.pid == pid)
384 return;
385 n = m;
386 }
387}
388
389/*
390 * This gets called if the number of connections grows
391 * past "max_connections".
392 *
393 * We _should_ start off by searching for connections
394 * from the same IP, and if there is some address wth
395 * multiple connections, we should kill that first.
396 *
397 * As it is, we just "randomly" kill 25% of the connections,
398 * and our pseudo-random generator sucks too. I have no
399 * shame.
400 *
401 * Really, this is just a place-holder for a _real_ algorithm.
402 */
02d57da4 403static void kill_some_children(int signo, unsigned start, unsigned stop)
66e631de
LT
404{
405 start %= MAX_CHILDREN;
406 stop %= MAX_CHILDREN;
407 while (start != stop) {
408 if (!(start & 3))
02d57da4 409 kill(live_child[start].pid, signo);
66e631de
LT
410 start = (start + 1) % MAX_CHILDREN;
411 }
412}
413
02d57da4 414static void check_max_connections(void)
a87e8be2 415{
02d57da4 416 for (;;) {
eaa94919 417 int active;
66e631de 418 unsigned spawned, reaped, deleted;
eaa94919 419
66e631de 420 spawned = children_spawned;
66e631de
LT
421 reaped = children_reaped;
422 deleted = children_deleted;
423
424 while (deleted < reaped) {
425 pid_t pid = dead_child[deleted % MAX_CHILDREN];
426 remove_child(pid, deleted, spawned);
427 deleted++;
428 }
429 children_deleted = deleted;
430
431 active = spawned - deleted;
02d57da4
LT
432 if (active <= max_connections)
433 break;
66e631de 434
02d57da4
LT
435 /* Kill some unstarted connections with SIGTERM */
436 kill_some_children(SIGTERM, deleted, spawned);
437 if (active <= max_connections << 1)
438 break;
439
440 /* If the SIGTERM thing isn't helping use SIGKILL */
441 kill_some_children(SIGKILL, deleted, spawned);
442 sleep(1);
443 }
444}
445
7fa09084 446static void handle(int incoming, struct sockaddr *addr, int addrlen)
02d57da4
LT
447{
448 pid_t pid = fork();
449
450 if (pid) {
451 unsigned idx;
452
453 close(incoming);
454 if (pid < 0)
455 return;
456
457 idx = children_spawned % MAX_CHILDREN;
458 children_spawned++;
459 add_child(idx, pid, addr, addrlen);
66e631de 460
02d57da4 461 check_max_connections();
a87e8be2
LT
462 return;
463 }
464
465 dup2(incoming, 0);
466 dup2(incoming, 1);
467 close(incoming);
f8ff0c06 468
5b276ee4 469 exit(execute(addr));
a87e8be2
LT
470}
471
eaa94919
LT
472static void child_handler(int signo)
473{
474 for (;;) {
9048fe1c
PB
475 int status;
476 pid_t pid = waitpid(-1, &status, WNOHANG);
66e631de
LT
477
478 if (pid > 0) {
479 unsigned reaped = children_reaped;
480 dead_child[reaped % MAX_CHILDREN] = pid;
481 children_reaped = reaped + 1;
f8ff0c06 482 /* XXX: Custom logging, since we don't wanna getpid() */
9048fe1c 483 if (verbose) {
554fe20d 484 const char *dead = "";
9048fe1c
PB
485 if (!WIFEXITED(status) || WEXITSTATUS(status) > 0)
486 dead = " (with error)";
487 if (log_syslog)
488 syslog(LOG_INFO, "[%d] Disconnected%s", pid, dead);
489 else
490 fprintf(stderr, "[%d] Disconnected%s\n", pid, dead);
491 }
eaa94919
LT
492 continue;
493 }
494 break;
495 }
496}
497
1955fabf
MW
498static int set_reuse_addr(int sockfd)
499{
500 int on = 1;
501
502 if (!reuseaddr)
503 return 0;
504 return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
505 &on, sizeof(on));
506}
507
6573faff
PA
508#ifndef NO_IPV6
509
510static int socksetup(int port, int **socklist_p)
a87e8be2 511{
df076bdb
YH
512 int socknum = 0, *socklist = NULL;
513 int maxfd = -1;
df076bdb 514 char pbuf[NI_MAXSERV];
a87e8be2 515
6573faff
PA
516 struct addrinfo hints, *ai0, *ai;
517 int gai;
df076bdb
YH
518
519 sprintf(pbuf, "%d", port);
520 memset(&hints, 0, sizeof(hints));
521 hints.ai_family = AF_UNSPEC;
522 hints.ai_socktype = SOCK_STREAM;
523 hints.ai_protocol = IPPROTO_TCP;
524 hints.ai_flags = AI_PASSIVE;
525
526 gai = getaddrinfo(NULL, pbuf, &hints, &ai0);
527 if (gai)
528 die("getaddrinfo() failed: %s\n", gai_strerror(gai));
529
df076bdb
YH
530 for (ai = ai0; ai; ai = ai->ai_next) {
531 int sockfd;
df076bdb
YH
532
533 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
534 if (sockfd < 0)
535 continue;
536 if (sockfd >= FD_SETSIZE) {
537 error("too large socket descriptor.");
538 close(sockfd);
539 continue;
540 }
541
542#ifdef IPV6_V6ONLY
543 if (ai->ai_family == AF_INET6) {
544 int on = 1;
545 setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
546 &on, sizeof(on));
547 /* Note: error is not fatal */
548 }
549#endif
550
1955fabf
MW
551 if (set_reuse_addr(sockfd)) {
552 close(sockfd);
0032d548 553 continue;
1955fabf
MW
554 }
555
df076bdb
YH
556 if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
557 close(sockfd);
558 continue; /* not fatal */
559 }
560 if (listen(sockfd, 5) < 0) {
561 close(sockfd);
562 continue; /* not fatal */
563 }
564
83572c1a 565 socklist = xrealloc(socklist, sizeof(int) * (socknum + 1));
df076bdb
YH
566 socklist[socknum++] = sockfd;
567
df076bdb
YH
568 if (maxfd < sockfd)
569 maxfd = sockfd;
570 }
571
572 freeaddrinfo(ai0);
573
6573faff
PA
574 *socklist_p = socklist;
575 return socknum;
576}
577
578#else /* NO_IPV6 */
579
580static int socksetup(int port, int **socklist_p)
581{
582 struct sockaddr_in sin;
583 int sockfd;
584
585 sockfd = socket(AF_INET, SOCK_STREAM, 0);
586 if (sockfd < 0)
587 return 0;
588
589 memset(&sin, 0, sizeof sin);
590 sin.sin_family = AF_INET;
591 sin.sin_addr.s_addr = htonl(INADDR_ANY);
592 sin.sin_port = htons(port);
593
1955fabf
MW
594 if (set_reuse_addr(sockfd)) {
595 close(sockfd);
596 return 0;
597 }
598
6573faff
PA
599 if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
600 close(sockfd);
601 return 0;
602 }
a87e8be2 603
f35230fb
PS
604 if (listen(sockfd, 5) < 0) {
605 close(sockfd);
606 return 0;
607 }
608
1b4713fb 609 *socklist_p = xmalloc(sizeof(int));
6573faff 610 **socklist_p = sockfd;
f35230fb 611 return 1;
6573faff
PA
612}
613
614#endif
615
616static int service_loop(int socknum, int *socklist)
617{
618 struct pollfd *pfd;
619 int i;
620
1b4713fb 621 pfd = xcalloc(socknum, sizeof(struct pollfd));
6573faff
PA
622
623 for (i = 0; i < socknum; i++) {
624 pfd[i].fd = socklist[i];
625 pfd[i].events = POLLIN;
626 }
9220282a
PA
627
628 signal(SIGCHLD, child_handler);
a87e8be2
LT
629
630 for (;;) {
df076bdb 631 int i;
6573faff 632
7872e055 633 if (poll(pfd, socknum, -1) < 0) {
1eef0b33 634 if (errno != EINTR) {
6573faff 635 error("poll failed, resuming: %s",
1eef0b33
JH
636 strerror(errno));
637 sleep(1);
638 }
df076bdb
YH
639 continue;
640 }
641
642 for (i = 0; i < socknum; i++) {
6573faff 643 if (pfd[i].revents & POLLIN) {
df076bdb 644 struct sockaddr_storage ss;
7626e49e 645 unsigned int sslen = sizeof(ss);
6573faff 646 int incoming = accept(pfd[i].fd, (struct sockaddr *)&ss, &sslen);
df076bdb
YH
647 if (incoming < 0) {
648 switch (errno) {
649 case EAGAIN:
650 case EINTR:
651 case ECONNABORTED:
652 continue;
653 default:
654 die("accept returned %s", strerror(errno));
655 }
656 }
657 handle(incoming, (struct sockaddr *)&ss, sslen);
a87e8be2
LT
658 }
659 }
a87e8be2
LT
660 }
661}
662
258e93a1
ML
663/* if any standard file descriptor is missing open it to /dev/null */
664static void sanitize_stdfds(void)
665{
666 int fd = open("/dev/null", O_RDWR, 0);
667 while (fd != -1 && fd < 2)
668 fd = dup(fd);
669 if (fd == -1)
670 die("open /dev/null or dup failed: %s", strerror(errno));
671 if (fd > 2)
672 close(fd);
673}
674
a5262768
ML
675static void daemonize(void)
676{
677 switch (fork()) {
678 case 0:
679 break;
680 case -1:
681 die("fork failed: %s", strerror(errno));
682 default:
683 exit(0);
684 }
685 if (setsid() == -1)
686 die("setsid failed: %s", strerror(errno));
687 close(0);
688 close(1);
689 close(2);
690 sanitize_stdfds();
691}
692
45ed5d7f
ML
693static void store_pid(const char *path)
694{
695 FILE *f = fopen(path, "w");
696 if (!f)
697 die("cannot open pid file %s: %s", path, strerror(errno));
698 fprintf(f, "%d\n", getpid());
699 fclose(f);
700}
701
678dac6b 702static int serve(int port, struct passwd *pass, gid_t gid)
6573faff
PA
703{
704 int socknum, *socklist;
4ae22d96 705
6573faff
PA
706 socknum = socksetup(port, &socklist);
707 if (socknum == 0)
708 die("unable to allocate any listen sockets on port %u", port);
4ae22d96 709
678dac6b
TS
710 if (pass && gid &&
711 (initgroups(pass->pw_name, gid) || setgid (gid) ||
712 setuid(pass->pw_uid)))
713 die("cannot drop privileges");
714
6573faff 715 return service_loop(socknum, socklist);
4ae22d96 716}
6573faff 717
a87e8be2
LT
718int main(int argc, char **argv)
719{
720 int port = DEFAULT_GIT_PORT;
e64e1b79 721 int inetd_mode = 0;
678dac6b 722 const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
a5262768 723 int detach = 0;
678dac6b
TS
724 struct passwd *pass = NULL;
725 struct group *group;
726 gid_t gid = 0;
a87e8be2
LT
727 int i;
728
f0b7367c
JH
729 /* Without this we cannot rely on waitpid() to tell
730 * what happened to our children.
731 */
732 signal(SIGCHLD, SIG_DFL);
733
a87e8be2
LT
734 for (i = 1; i < argc; i++) {
735 char *arg = argv[i];
736
737 if (!strncmp(arg, "--port=", 7)) {
738 char *end;
739 unsigned long n;
740 n = strtoul(arg+7, &end, 0);
741 if (arg[7] && !*end) {
742 port = n;
743 continue;
744 }
745 }
e64e1b79
LT
746 if (!strcmp(arg, "--inetd")) {
747 inetd_mode = 1;
a8883288 748 log_syslog = 1;
e64e1b79
LT
749 continue;
750 }
f8ff0c06
PB
751 if (!strcmp(arg, "--verbose")) {
752 verbose = 1;
753 continue;
754 }
9048fe1c
PB
755 if (!strcmp(arg, "--syslog")) {
756 log_syslog = 1;
9048fe1c
PB
757 continue;
758 }
4ae95682
PA
759 if (!strcmp(arg, "--export-all")) {
760 export_all_trees = 1;
761 continue;
762 }
960deccb
PA
763 if (!strncmp(arg, "--timeout=", 10)) {
764 timeout = atoi(arg+10);
a8883288 765 continue;
960deccb 766 }
54e31a20 767 if (!strncmp(arg, "--init-timeout=", 15)) {
960deccb 768 init_timeout = atoi(arg+15);
a8883288 769 continue;
960deccb 770 }
4dbd1352
AE
771 if (!strcmp(arg, "--strict-paths")) {
772 strict_paths = 1;
773 continue;
774 }
b21c31c9
PB
775 if (!strncmp(arg, "--base-path=", 12)) {
776 base_path = arg+12;
777 continue;
778 }
1955fabf
MW
779 if (!strcmp(arg, "--reuseaddr")) {
780 reuseaddr = 1;
781 continue;
782 }
603968d2
JH
783 if (!strcmp(arg, "--user-path")) {
784 user_path = "";
785 continue;
786 }
787 if (!strncmp(arg, "--user-path=", 12)) {
788 user_path = arg + 12;
789 continue;
790 }
45ed5d7f
ML
791 if (!strncmp(arg, "--pid-file=", 11)) {
792 pid_file = arg + 11;
793 continue;
794 }
a5262768
ML
795 if (!strcmp(arg, "--detach")) {
796 detach = 1;
797 log_syslog = 1;
798 continue;
799 }
678dac6b
TS
800 if (!strncmp(arg, "--user=", 7)) {
801 user_name = arg + 7;
802 continue;
803 }
804 if (!strncmp(arg, "--group=", 8)) {
805 group_name = arg + 8;
806 continue;
807 }
4ae95682
PA
808 if (!strcmp(arg, "--")) {
809 ok_paths = &argv[i+1];
810 break;
811 } else if (arg[0] != '-') {
812 ok_paths = &argv[i];
813 break;
814 }
e64e1b79 815
a87e8be2
LT
816 usage(daemon_usage);
817 }
818
678dac6b
TS
819 if (inetd_mode && (group_name || user_name))
820 die("--user and --group are incompatible with --inetd");
821
822 if (group_name && !user_name)
823 die("--group supplied without --user");
824
825 if (user_name) {
826 pass = getpwnam(user_name);
827 if (!pass)
828 die("user not found - %s", user_name);
829
830 if (!group_name)
831 gid = pass->pw_gid;
832 else {
833 group = getgrnam(group_name);
834 if (!group)
835 die("group not found - %s", group_name);
836
837 gid = group->gr_gid;
838 }
839 }
840
ad8b4f56 841 if (log_syslog) {
a8883288 842 openlog("git-daemon", 0, LOG_DAEMON);
ad8b4f56 843 set_die_routine(daemon_die);
4dbd1352
AE
844 }
845
ad8b4f56
ML
846 if (strict_paths && (!ok_paths || !*ok_paths))
847 die("option --strict-paths requires a whitelist");
848
7c3693f1 849 if (inetd_mode) {
5b276ee4
DW
850 struct sockaddr_storage ss;
851 struct sockaddr *peer = (struct sockaddr *)&ss;
852 socklen_t slen = sizeof(ss);
853
ba0012c3 854 freopen("/dev/null", "w", stderr);
5b276ee4
DW
855
856 if (getpeername(0, peer, &slen))
857 peer = NULL;
858
859 return execute(peer);
7c3693f1 860 }
bce8230d 861
a5262768
ML
862 if (detach)
863 daemonize();
864 else
865 sanitize_stdfds();
258e93a1 866
45ed5d7f
ML
867 if (pid_file)
868 store_pid(pid_file);
869
678dac6b 870 return serve(port, pass, gid);
a87e8be2 871}