pkt-line: share buffer/descriptor reading implementation
[git/git.git] / daemon.c
CommitLineData
979e32fa 1#include "cache.h"
85023577 2#include "pkt-line.h"
77cb17e9 3#include "exec_cmd.h"
5d87dd4f
JS
4#include "run-command.h"
5#include "strbuf.h"
3a3a29c1 6#include "string-list.h"
f8ff0c06 7
695dffe2
JS
8#ifndef HOST_NAME_MAX
9#define HOST_NAME_MAX 256
10#endif
11
415e7b87
PW
12#ifndef NI_MAXSERV
13#define NI_MAXSERV 32
14#endif
15
2844923d
MD
16#ifdef NO_INITGROUPS
17#define initgroups(x, y) (0) /* nothing */
18#endif
19
9048fe1c 20static int log_syslog;
f8ff0c06 21static int verbose;
1955fabf 22static int reuseaddr;
d5570f4d 23static int informative_errors;
f8ff0c06 24
960deccb 25static const char daemon_usage[] =
1b1dd23f 26"git daemon [--verbose] [--syslog] [--export-all]\n"
62b4698e
ŠN
27" [--timeout=<n>] [--init-timeout=<n>] [--max-connections=<n>]\n"
28" [--strict-paths] [--base-path=<path>] [--base-path-relaxed]\n"
29" [--user-path | --user-path=<path>]\n"
30" [--interpolated-path=<path>]\n"
9cddf56e 31" [--reuseaddr] [--pid-file=<file>]\n"
62b4698e 32" [--(enable|disable|allow-override|forbid-override)=<service>]\n"
93741e4a 33" [--access-hook=<path>]\n"
62b4698e 34" [--inetd | [--listen=<host_or_ipaddr>] [--port=<n>]\n"
9cddf56e 35" [--detach] [--user=<user> [--group=<group>]]\n"
62b4698e 36" [<directory>...]";
4ae95682
PA
37
38/* List of acceptable pathname prefixes */
96f1e58f
DR
39static char **ok_paths;
40static int strict_paths;
4ae95682
PA
41
42/* If this is set, git-daemon-export-ok is not required */
96f1e58f 43static int export_all_trees;
f8ff0c06 44
b21c31c9 45/* Take all paths relative to this one if non-NULL */
96f1e58f 46static char *base_path;
49ba83fb 47static char *interpolated_path;
73a7a656 48static int base_path_relaxed;
49ba83fb
JL
49
50/* Flag indicating client sent extra args. */
51static int saw_extended_args;
b21c31c9 52
603968d2
JH
53/* If defined, ~user notation is allowed and the string is inserted
54 * after ~user/. E.g. a request to git://host/~alice/frotz would
55 * go to /home/alice/pub_git/frotz with --user-path=pub_git.
56 */
96f1e58f 57static const char *user_path;
603968d2 58
960deccb 59/* Timeout, and initial timeout */
96f1e58f
DR
60static unsigned int timeout;
61static unsigned int init_timeout;
f8ff0c06 62
9d7ca667
RS
63static char *hostname;
64static char *canon_hostname;
65static char *ip_address;
66static char *tcp_port;
49ba83fb 67
9048fe1c 68static void logreport(int priority, const char *err, va_list params)
f8ff0c06 69{
9048fe1c 70 if (log_syslog) {
6a992e9e
SB
71 char buf[1024];
72 vsnprintf(buf, sizeof(buf), err, params);
9048fe1c 73 syslog(priority, "%s", buf);
460c2010
JH
74 } else {
75 /*
48cfaea1 76 * Since stderr is set to buffered mode, the
6a992e9e 77 * logging of different processes will not overlap
48cfaea1 78 * unless they overflow the (rather big) buffers.
6a992e9e 79 */
85e72830 80 fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid());
6a992e9e
SB
81 vfprintf(stderr, err, params);
82 fputc('\n', stderr);
48cfaea1 83 fflush(stderr);
6a992e9e 84 }
f8ff0c06
PB
85}
86
28bea9e5 87__attribute__((format (printf, 1, 2)))
cdda4745 88static void logerror(const char *err, ...)
f8ff0c06
PB
89{
90 va_list params;
91 va_start(params, err);
9048fe1c 92 logreport(LOG_ERR, err, params);
f8ff0c06
PB
93 va_end(params);
94}
95
28bea9e5 96__attribute__((format (printf, 1, 2)))
cdda4745 97static void loginfo(const char *err, ...)
f8ff0c06
PB
98{
99 va_list params;
100 if (!verbose)
101 return;
102 va_start(params, err);
9048fe1c 103 logreport(LOG_INFO, err, params);
f8ff0c06
PB
104 va_end(params);
105}
a87e8be2 106
ad8b4f56
ML
107static void NORETURN daemon_die(const char *err, va_list params)
108{
109 logreport(LOG_ERR, err, params);
110 exit(1);
111}
112
1c64b48e 113static const char *path_ok(char *directory)
4ae95682 114{
603968d2 115 static char rpath[PATH_MAX];
49ba83fb 116 static char interp_path[PATH_MAX];
1c64b48e 117 const char *path;
49ba83fb
JL
118 char *dir;
119
9d7ca667 120 dir = directory;
d79374c7 121
34b6cb8b 122 if (daemon_avoid_alias(dir)) {
d79374c7
JH
123 logerror("'%s': aliased", dir);
124 return NULL;
125 }
126
603968d2
JH
127 if (*dir == '~') {
128 if (!user_path) {
129 logerror("'%s': User-path not allowed", dir);
130 return NULL;
131 }
132 if (*user_path) {
133 /* Got either "~alice" or "~alice/foo";
134 * rewrite them to "~alice/%s" or
135 * "~alice/%s/foo".
136 */
137 int namlen, restlen = strlen(dir);
138 char *slash = strchr(dir, '/');
139 if (!slash)
140 slash = dir + restlen;
141 namlen = slash - dir;
142 restlen -= namlen;
143 loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
144 snprintf(rpath, PATH_MAX, "%.*s/%s%.*s",
145 namlen, dir, user_path, restlen, slash);
146 dir = rpath;
147 }
148 }
49ba83fb 149 else if (interpolated_path && saw_extended_args) {
9d7ca667 150 struct strbuf expanded_path = STRBUF_INIT;
66dbfd55
GV
151 struct strbuf_expand_dict_entry dict[6];
152
153 dict[0].placeholder = "H"; dict[0].value = hostname;
154 dict[1].placeholder = "CH"; dict[1].value = canon_hostname;
155 dict[2].placeholder = "IP"; dict[2].value = ip_address;
156 dict[3].placeholder = "P"; dict[3].value = tcp_port;
157 dict[4].placeholder = "D"; dict[4].value = directory;
158 dict[5].placeholder = NULL; dict[5].value = NULL;
49ba83fb
JL
159 if (*dir != '/') {
160 /* Allow only absolute */
161 logerror("'%s': Non-absolute path denied (interpolated-path active)", dir);
162 return NULL;
163 }
164
9d7ca667
RS
165 strbuf_expand(&expanded_path, interpolated_path,
166 strbuf_expand_dict_cb, &dict);
167 strlcpy(interp_path, expanded_path.buf, PATH_MAX);
168 strbuf_release(&expanded_path);
49ba83fb
JL
169 loginfo("Interpolated dir '%s'", interp_path);
170
171 dir = interp_path;
172 }
603968d2
JH
173 else if (base_path) {
174 if (*dir != '/') {
175 /* Allow only absolute */
1fda3d55 176 logerror("'%s': Non-absolute path denied (base-path active)", dir);
b21c31c9
PB
177 return NULL;
178 }
49ba83fb
JL
179 snprintf(rpath, PATH_MAX, "%s%s", base_path, dir);
180 dir = rpath;
b21c31c9
PB
181 }
182
a583971f
RS
183 path = enter_repo(dir, strict_paths);
184 if (!path && base_path && base_path_relaxed) {
73a7a656
JA
185 /*
186 * if we fail and base_path_relaxed is enabled, try without
187 * prefixing the base path
188 */
a583971f
RS
189 dir = directory;
190 path = enter_repo(dir, strict_paths);
191 }
3e04c62d 192
4dbd1352 193 if (!path) {
05ac6b34 194 logerror("'%s' does not appear to be a git repository", dir);
4dbd1352 195 return NULL;
4ae95682
PA
196 }
197
198 if ( ok_paths && *ok_paths ) {
ce335fe0 199 char **pp;
4dbd1352 200 int pathlen = strlen(path);
4ae95682 201
ce335fe0 202 /* The validation is done on the paths after enter_repo
a6080a0a 203 * appends optional {.git,.git/.git} and friends, but
d79374c7
JH
204 * it does not use getcwd(). So if your /pub is
205 * a symlink to /mnt/pub, you can whitelist /pub and
206 * do not have to say /mnt/pub.
207 * Do not say /pub/.
ce335fe0 208 */
4ae95682
PA
209 for ( pp = ok_paths ; *pp ; pp++ ) {
210 int len = strlen(*pp);
ce335fe0
JH
211 if (len <= pathlen &&
212 !memcmp(*pp, path, len) &&
213 (path[len] == '\0' ||
214 (!strict_paths && path[len] == '/')))
215 return path;
4ae95682 216 }
4dbd1352
AE
217 }
218 else {
219 /* be backwards compatible */
220 if (!strict_paths)
221 return path;
4ae95682
PA
222 }
223
4dbd1352
AE
224 logerror("'%s': not in whitelist", path);
225 return NULL; /* Fallthrough. Deny by default */
4ae95682 226}
a87e8be2 227
d819e4e6
JH
228typedef int (*daemon_service_fn)(void);
229struct daemon_service {
230 const char *name;
231 const char *config_name;
232 daemon_service_fn fn;
233 int enabled;
234 int overridable;
235};
236
237static struct daemon_service *service_looking_at;
238static int service_enabled;
239
ef90d6d4 240static int git_daemon_config(const char *var, const char *value, void *cb)
d819e4e6 241{
cc44c765 242 if (!prefixcmp(var, "daemon.") &&
d819e4e6
JH
243 !strcmp(var + 7, service_looking_at->config_name)) {
244 service_enabled = git_config_bool(var, value);
245 return 0;
246 }
247
248 /* we are not interested in parsing any other configuration here */
249 return 0;
250}
251
d5570f4d
JK
252static int daemon_error(const char *dir, const char *msg)
253{
254 if (!informative_errors)
255 msg = "access denied or repository not exported";
256 packet_write(1, "ERR %s: %s", msg, dir);
257 return -1;
258}
259
93741e4a
JH
260static char *access_hook;
261
262static int run_access_hook(struct daemon_service *service, const char *dir, const char *path)
263{
264 struct child_process child;
265 struct strbuf buf = STRBUF_INIT;
266 const char *argv[8];
267 const char **arg = argv;
268 char *eol;
269 int seen_errors = 0;
270
271#define STRARG(x) ((x) ? (x) : "")
272 *arg++ = access_hook;
273 *arg++ = service->name;
274 *arg++ = path;
275 *arg++ = STRARG(hostname);
276 *arg++ = STRARG(canon_hostname);
277 *arg++ = STRARG(ip_address);
278 *arg++ = STRARG(tcp_port);
279 *arg = NULL;
280#undef STRARG
281
282 memset(&child, 0, sizeof(child));
283 child.use_shell = 1;
284 child.argv = argv;
285 child.no_stdin = 1;
286 child.no_stderr = 1;
287 child.out = -1;
288 if (start_command(&child)) {
289 logerror("daemon access hook '%s' failed to start",
290 access_hook);
291 goto error_return;
292 }
293 if (strbuf_read(&buf, child.out, 0) < 0) {
294 logerror("failed to read from pipe to daemon access hook '%s'",
295 access_hook);
296 strbuf_reset(&buf);
297 seen_errors = 1;
298 }
299 if (close(child.out) < 0) {
300 logerror("failed to close pipe to daemon access hook '%s'",
301 access_hook);
302 seen_errors = 1;
303 }
304 if (finish_command(&child))
305 seen_errors = 1;
306
307 if (!seen_errors) {
308 strbuf_release(&buf);
309 return 0;
310 }
311
312error_return:
313 strbuf_ltrim(&buf);
314 if (!buf.len)
315 strbuf_addstr(&buf, "service rejected");
316 eol = strchr(buf.buf, '\n');
317 if (eol)
318 *eol = '\0';
319 errno = EACCES;
320 daemon_error(dir, buf.buf);
321 strbuf_release(&buf);
322 return -1;
323}
324
a47551c3 325static int run_service(char *dir, struct daemon_service *service)
a87e8be2 326{
4dbd1352 327 const char *path;
d819e4e6
JH
328 int enabled = service->enabled;
329
a47551c3 330 loginfo("Request %s for '%s'", service->name, dir);
4dbd1352 331
d819e4e6
JH
332 if (!enabled && !service->overridable) {
333 logerror("'%s': service not enabled.", service->name);
334 errno = EACCES;
d5570f4d 335 return daemon_error(dir, "service not enabled");
d819e4e6 336 }
4ae95682 337
a47551c3 338 if (!(path = path_ok(dir)))
d5570f4d 339 return daemon_error(dir, "no such repository");
47888f0f 340
a87e8be2
LT
341 /*
342 * Security on the cheap.
343 *
a935c397 344 * We want a readable HEAD, usable "objects" directory, and
a87e8be2
LT
345 * a "git-daemon-export-ok" flag that says that the other side
346 * is ok with us doing this.
4dbd1352
AE
347 *
348 * path_ok() uses enter_repo() and does whitelist checking.
349 * We only need to make sure the repository is exported.
a87e8be2 350 */
4dbd1352 351
3e04c62d 352 if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
4dbd1352 353 logerror("'%s': repository not exported.", path);
3e04c62d 354 errno = EACCES;
d5570f4d 355 return daemon_error(dir, "repository not exported");
3e04c62d
PA
356 }
357
d819e4e6
JH
358 if (service->overridable) {
359 service_looking_at = service;
360 service_enabled = -1;
ef90d6d4 361 git_config(git_daemon_config, NULL);
d819e4e6
JH
362 if (0 <= service_enabled)
363 enabled = service_enabled;
364 }
365 if (!enabled) {
366 logerror("'%s': service not enabled for '%s'",
367 service->name, path);
368 errno = EACCES;
d5570f4d 369 return daemon_error(dir, "service not enabled");
d819e4e6
JH
370 }
371
93741e4a
JH
372 /*
373 * Optionally, a hook can choose to deny access to the
374 * repository depending on the phase of the moon.
375 */
376 if (access_hook && run_access_hook(service, dir, path))
377 return -1;
378
02d57da4
LT
379 /*
380 * We'll ignore SIGTERM from now on, we have a
381 * good client.
382 */
383 signal(SIGTERM, SIG_IGN);
384
d819e4e6
JH
385 return service->fn();
386}
387
5d87dd4f
JS
388static void copy_to_log(int fd)
389{
390 struct strbuf line = STRBUF_INIT;
391 FILE *fp;
392
393 fp = fdopen(fd, "r");
394 if (fp == NULL) {
395 logerror("fdopen of error channel failed");
396 close(fd);
397 return;
398 }
399
400 while (strbuf_getline(&line, fp, '\n') != EOF) {
401 logerror("%s", line.buf);
402 strbuf_setlen(&line, 0);
403 }
404
405 strbuf_release(&line);
406 fclose(fp);
407}
408
409static int run_service_command(const char **argv)
410{
411 struct child_process cld;
412
413 memset(&cld, 0, sizeof(cld));
414 cld.argv = argv;
415 cld.git_cmd = 1;
416 cld.err = -1;
417 if (start_command(&cld))
418 return -1;
419
420 close(0);
421 close(1);
422
423 copy_to_log(cld.err);
424
425 return finish_command(&cld);
426}
427
d819e4e6
JH
428static int upload_pack(void)
429{
430 /* Timeout as string */
431 char timeout_buf[64];
66dbfd55
GV
432 const char *argv[] = { "upload-pack", "--strict", NULL, ".", NULL };
433
434 argv[2] = timeout_buf;
d819e4e6 435
960deccb 436 snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout);
5d87dd4f 437 return run_service_command(argv);
a87e8be2
LT
438}
439
39345a21
FBH
440static int upload_archive(void)
441{
5d87dd4f
JS
442 static const char *argv[] = { "upload-archive", ".", NULL };
443 return run_service_command(argv);
39345a21
FBH
444}
445
4b3b1e1e
LT
446static int receive_pack(void)
447{
5d87dd4f
JS
448 static const char *argv[] = { "receive-pack", ".", NULL };
449 return run_service_command(argv);
4b3b1e1e
LT
450}
451
d819e4e6 452static struct daemon_service daemon_service[] = {
39345a21 453 { "upload-archive", "uploadarch", upload_archive, 0, 1 },
d819e4e6 454 { "upload-pack", "uploadpack", upload_pack, 1, 1 },
4b3b1e1e 455 { "receive-pack", "receivepack", receive_pack, 0, 1 },
d819e4e6
JH
456};
457
f3fa1838
JH
458static void enable_service(const char *name, int ena)
459{
d819e4e6
JH
460 int i;
461 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
462 if (!strcmp(daemon_service[i].name, name)) {
463 daemon_service[i].enabled = ena;
464 return;
465 }
466 }
467 die("No such service %s", name);
468}
469
f3fa1838
JH
470static void make_service_overridable(const char *name, int ena)
471{
d819e4e6
JH
472 int i;
473 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
474 if (!strcmp(daemon_service[i].name, name)) {
475 daemon_service[i].overridable = ena;
476 return;
477 }
478 }
479 die("No such service %s", name);
480}
481
6720e95b
RS
482static char *xstrdup_tolower(const char *str)
483{
484 char *p, *dup = xstrdup(str);
485 for (p = dup; *p; p++)
486 *p = tolower(*p);
487 return dup;
488}
489
e8dbd76d
IL
490static void parse_host_and_port(char *hostport, char **host,
491 char **port)
492{
493 if (*hostport == '[') {
494 char *end;
495
496 end = strchr(hostport, ']');
497 if (!end)
9517e6b8 498 die("Invalid request ('[' without ']')");
e8dbd76d
IL
499 *end = '\0';
500 *host = hostport + 1;
501 if (!end[1])
502 *port = NULL;
503 else if (end[1] == ':')
504 *port = end + 2;
505 else
506 die("Garbage after end of host part");
507 } else {
508 *host = hostport;
509 *port = strrchr(hostport, ':');
510 if (*port) {
e9bd3235 511 **port = '\0';
e8dbd76d
IL
512 ++*port;
513 }
514 }
515}
516
eb30aed7 517/*
73bb33a9 518 * Read the host as supplied by the client connection.
eb30aed7 519 */
73bb33a9 520static void parse_host_arg(char *extra_args, int buflen)
49ba83fb
JL
521{
522 char *val;
523 int vallen;
524 char *end = extra_args + buflen;
525
73bb33a9 526 if (extra_args < end && *extra_args) {
49ba83fb
JL
527 saw_extended_args = 1;
528 if (strncasecmp("host=", extra_args, 5) == 0) {
529 val = extra_args + 5;
530 vallen = strlen(val) + 1;
531 if (*val) {
eb30aed7 532 /* Split <host>:<port> at colon. */
e8dbd76d
IL
533 char *host;
534 char *port;
535 parse_host_and_port(val, &host, &port);
dd467629 536 if (port) {
9d7ca667
RS
537 free(tcp_port);
538 tcp_port = xstrdup(port);
dd467629 539 }
9d7ca667 540 free(hostname);
6720e95b 541 hostname = xstrdup_tolower(host);
49ba83fb 542 }
eb30aed7 543
49ba83fb
JL
544 /* On to the next one */
545 extra_args = val + vallen;
546 }
73bb33a9
SP
547 if (extra_args < end && *extra_args)
548 die("Invalid request");
49ba83fb 549 }
dd467629 550
dd467629
JL
551 /*
552 * Locate canonical hostname and its IP address.
553 */
6720e95b 554 if (hostname) {
dd467629 555#ifndef NO_IPV6
dd467629 556 struct addrinfo hints;
3e8a00ae 557 struct addrinfo *ai;
dd467629
JL
558 int gai;
559 static char addrbuf[HOST_NAME_MAX + 1];
560
561 memset(&hints, 0, sizeof(hints));
562 hints.ai_flags = AI_CANONNAME;
563
2af202be 564 gai = getaddrinfo(hostname, NULL, &hints, &ai);
dd467629 565 if (!gai) {
3e8a00ae
BK
566 struct sockaddr_in *sin_addr = (void *)ai->ai_addr;
567
568 inet_ntop(AF_INET, &sin_addr->sin_addr,
569 addrbuf, sizeof(addrbuf));
570 free(ip_address);
571 ip_address = xstrdup(addrbuf);
572
573 free(canon_hostname);
574 canon_hostname = xstrdup(ai->ai_canonname ?
575 ai->ai_canonname : ip_address);
576
577 freeaddrinfo(ai);
dd467629 578 }
dd467629 579#else
dd467629
JL
580 struct hostent *hent;
581 struct sockaddr_in sa;
582 char **ap;
583 static char addrbuf[HOST_NAME_MAX + 1];
584
9d7ca667 585 hent = gethostbyname(hostname);
dd467629
JL
586
587 ap = hent->h_addr_list;
588 memset(&sa, 0, sizeof sa);
589 sa.sin_family = hent->h_addrtype;
590 sa.sin_port = htons(0);
591 memcpy(&sa.sin_addr, *ap, hent->h_length);
592
593 inet_ntop(hent->h_addrtype, &sa.sin_addr,
594 addrbuf, sizeof(addrbuf));
eb30aed7 595
9d7ca667
RS
596 free(canon_hostname);
597 canon_hostname = xstrdup(hent->h_name);
598 free(ip_address);
599 ip_address = xstrdup(addrbuf);
dd467629 600#endif
6720e95b 601 }
dd467629
JL
602}
603
604
f9c87be6 605static int execute(void)
a87e8be2 606{
74543a04 607 char *line = packet_buffer;
d819e4e6 608 int pktlen, len, i;
f9c87be6 609 char *addr = getenv("REMOTE_ADDR"), *port = getenv("REMOTE_PORT");
7d80694a 610
f9c87be6
EFL
611 if (addr)
612 loginfo("Connection from %s:%s", addr, port);
5b276ee4 613
960deccb 614 alarm(init_timeout ? init_timeout : timeout);
4981fe75 615 pktlen = packet_read(0, NULL, NULL, packet_buffer, sizeof(packet_buffer), 0);
960deccb 616 alarm(0);
7d80694a 617
5ad312be
JL
618 len = strlen(line);
619 if (pktlen != len)
620 loginfo("Extended attributes (%d bytes) exist <%.*s>",
621 (int) pktlen - len,
622 (int) pktlen - len, line + len + 1);
83543a24 623 if (len && line[len-1] == '\n') {
7d80694a 624 line[--len] = 0;
83543a24
JH
625 pktlen--;
626 }
7d80694a 627
9d7ca667
RS
628 free(hostname);
629 free(canon_hostname);
630 free(ip_address);
631 free(tcp_port);
a47551c3 632 hostname = canon_hostname = ip_address = tcp_port = NULL;
eb30aed7 633
d433ed0b 634 if (len != pktlen)
73bb33a9 635 parse_host_arg(line + len + 1, pktlen - len - 1);
49ba83fb 636
d819e4e6
JH
637 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
638 struct daemon_service *s = &(daemon_service[i]);
639 int namelen = strlen(s->name);
599065a3 640 if (!prefixcmp(line, "git-") &&
d819e4e6 641 !strncmp(s->name, line + 4, namelen) &&
49ba83fb 642 line[namelen + 4] == ' ') {
eb30aed7
JL
643 /*
644 * Note: The directory here is probably context sensitive,
645 * and might depend on the actual service being performed.
646 */
a47551c3 647 return run_service(line + namelen + 5, s);
49ba83fb 648 }
d819e4e6 649 }
a87e8be2 650
f8ff0c06 651 logerror("Protocol error: '%s'", line);
a87e8be2
LT
652 return -1;
653}
654
15515b73
EFL
655static int addrcmp(const struct sockaddr_storage *s1,
656 const struct sockaddr_storage *s2)
657{
3aff874a
BC
658 const struct sockaddr *sa1 = (const struct sockaddr*) s1;
659 const struct sockaddr *sa2 = (const struct sockaddr*) s2;
660
661 if (sa1->sa_family != sa2->sa_family)
662 return sa1->sa_family - sa2->sa_family;
663 if (sa1->sa_family == AF_INET)
15515b73
EFL
664 return memcmp(&((struct sockaddr_in *)s1)->sin_addr,
665 &((struct sockaddr_in *)s2)->sin_addr,
666 sizeof(struct in_addr));
667#ifndef NO_IPV6
3aff874a 668 if (sa1->sa_family == AF_INET6)
15515b73
EFL
669 return memcmp(&((struct sockaddr_in6 *)s1)->sin6_addr,
670 &((struct sockaddr_in6 *)s2)->sin6_addr,
671 sizeof(struct in6_addr));
672#endif
673 return 0;
674}
675
3bd62c21 676static int max_connections = 32;
66e631de 677
3bd62c21 678static unsigned int live_children;
66e631de 679
4d8fa916 680static struct child {
3bd62c21 681 struct child *next;
30e15602 682 struct child_process cld;
df076bdb 683 struct sockaddr_storage address;
3bd62c21 684} *firstborn;
66e631de 685
c295cf06 686static void add_child(struct child_process *cld, struct sockaddr *addr, socklen_t addrlen)
66e631de 687{
460c2010
JH
688 struct child *newborn, **cradle;
689
460c2010
JH
690 newborn = xcalloc(1, sizeof(*newborn));
691 live_children++;
30e15602 692 memcpy(&newborn->cld, cld, sizeof(*cld));
460c2010
JH
693 memcpy(&newborn->address, addr, addrlen);
694 for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next)
15515b73 695 if (!addrcmp(&(*cradle)->address, &newborn->address))
460c2010
JH
696 break;
697 newborn->next = *cradle;
698 *cradle = newborn;
66e631de
LT
699}
700
66e631de
LT
701/*
702 * This gets called if the number of connections grows
703 * past "max_connections".
704 *
3bd62c21 705 * We kill the newest connection from a duplicate IP.
66e631de 706 */
3bd62c21 707static void kill_some_child(void)
66e631de 708{
460c2010 709 const struct child *blanket, *next;
66e631de 710
460c2010
JH
711 if (!(blanket = firstborn))
712 return;
695605b5 713
460c2010 714 for (; (next = blanket->next); blanket = next)
15515b73 715 if (!addrcmp(&blanket->address, &next->address)) {
30e15602 716 kill(blanket->cld.pid, SIGTERM);
460c2010
JH
717 break;
718 }
a5a9126b
JS
719}
720
3bd62c21 721static void check_dead_children(void)
a87e8be2 722{
3bd62c21
SB
723 int status;
724 pid_t pid;
02d57da4 725
30e15602
EFL
726 struct child **cradle, *blanket;
727 for (cradle = &firstborn; (blanket = *cradle);)
728 if ((pid = waitpid(blanket->cld.pid, &status, WNOHANG)) > 1) {
729 const char *dead = "";
730 if (status)
731 dead = " (with error)";
732 loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead);
733
734 /* remove the child */
735 *cradle = blanket->next;
736 live_children--;
737 free(blanket);
738 } else
739 cradle = &blanket->next;
02d57da4
LT
740}
741
30e15602 742static char **cld_argv;
c295cf06 743static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen)
02d57da4 744{
c2e86add 745 struct child_process cld = { NULL };
f9c87be6
EFL
746 char addrbuf[300] = "REMOTE_ADDR=", portbuf[300];
747 char *env[] = { addrbuf, portbuf, NULL };
02d57da4 748
3bd62c21
SB
749 if (max_connections && live_children >= max_connections) {
750 kill_some_child();
460c2010 751 sleep(1); /* give it some time to die */
3bd62c21
SB
752 check_dead_children();
753 if (live_children >= max_connections) {
754 close(incoming);
755 logerror("Too many children, dropping connection");
756 return;
757 }
758 }
02d57da4 759
f9c87be6
EFL
760 if (addr->sa_family == AF_INET) {
761 struct sockaddr_in *sin_addr = (void *) addr;
762 inet_ntop(addr->sa_family, &sin_addr->sin_addr, addrbuf + 12,
763 sizeof(addrbuf) - 12);
764 snprintf(portbuf, sizeof(portbuf), "REMOTE_PORT=%d",
765 ntohs(sin_addr->sin_port));
766#ifndef NO_IPV6
767 } else if (addr && addr->sa_family == AF_INET6) {
768 struct sockaddr_in6 *sin6_addr = (void *) addr;
769
770 char *buf = addrbuf + 12;
771 *buf++ = '['; *buf = '\0'; /* stpcpy() is cool */
772 inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf,
773 sizeof(addrbuf) - 13);
774 strcat(buf, "]");
775
776 snprintf(portbuf, sizeof(portbuf), "REMOTE_PORT=%d",
777 ntohs(sin6_addr->sin6_port));
778#endif
779 }
780
781 cld.env = (const char **)env;
30e15602
EFL
782 cld.argv = (const char **)cld_argv;
783 cld.in = incoming;
784 cld.out = dup(incoming);
a87e8be2 785
30e15602
EFL
786 if (start_command(&cld))
787 logerror("unable to fork");
788 else
789 add_child(&cld, addr, addrlen);
a87e8be2 790 close(incoming);
a87e8be2
LT
791}
792
eaa94919
LT
793static void child_handler(int signo)
794{
460c2010
JH
795 /*
796 * Otherwise empty handler because systemcalls will get interrupted
695605b5
SB
797 * upon signal receipt
798 * SysV needs the handler to be rearmed
799 */
bd7b371e 800 signal(SIGCHLD, child_handler);
eaa94919
LT
801}
802
1955fabf
MW
803static int set_reuse_addr(int sockfd)
804{
805 int on = 1;
806
807 if (!reuseaddr)
808 return 0;
809 return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
810 &on, sizeof(on));
811}
812
2caa3215
AS
813struct socketlist {
814 int *list;
815 size_t nr;
816 size_t alloc;
817};
818
089d82e8
NTND
819static const char *ip2str(int family, struct sockaddr *sin, socklen_t len)
820{
821#ifdef NO_IPV6
822 static char ip[INET_ADDRSTRLEN];
823#else
824 static char ip[INET6_ADDRSTRLEN];
825#endif
826
827 switch (family) {
828#ifndef NO_IPV6
829 case AF_INET6:
830 inet_ntop(family, &((struct sockaddr_in6*)sin)->sin6_addr, ip, len);
831 break;
832#endif
833 case AF_INET:
834 inet_ntop(family, &((struct sockaddr_in*)sin)->sin_addr, ip, len);
835 break;
836 default:
837 strcpy(ip, "<unknown>");
838 }
839 return ip;
840}
841
6573faff
PA
842#ifndef NO_IPV6
843
2caa3215 844static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
a87e8be2 845{
2caa3215 846 int socknum = 0;
df076bdb 847 int maxfd = -1;
df076bdb 848 char pbuf[NI_MAXSERV];
6573faff
PA
849 struct addrinfo hints, *ai0, *ai;
850 int gai;
20276889 851 long flags;
df076bdb 852
dd467629 853 sprintf(pbuf, "%d", listen_port);
df076bdb
YH
854 memset(&hints, 0, sizeof(hints));
855 hints.ai_family = AF_UNSPEC;
856 hints.ai_socktype = SOCK_STREAM;
857 hints.ai_protocol = IPPROTO_TCP;
858 hints.ai_flags = AI_PASSIVE;
859
dd467629 860 gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0);
2caa3215
AS
861 if (gai) {
862 logerror("getaddrinfo() for %s failed: %s", listen_addr, gai_strerror(gai));
863 return 0;
864 }
df076bdb 865
df076bdb
YH
866 for (ai = ai0; ai; ai = ai->ai_next) {
867 int sockfd;
df076bdb
YH
868
869 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
870 if (sockfd < 0)
871 continue;
872 if (sockfd >= FD_SETSIZE) {
df0daf8a 873 logerror("Socket descriptor too large");
df076bdb
YH
874 close(sockfd);
875 continue;
876 }
877
878#ifdef IPV6_V6ONLY
879 if (ai->ai_family == AF_INET6) {
880 int on = 1;
881 setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
882 &on, sizeof(on));
883 /* Note: error is not fatal */
884 }
885#endif
886
1955fabf 887 if (set_reuse_addr(sockfd)) {
089d82e8 888 logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
1955fabf 889 close(sockfd);
0032d548 890 continue;
1955fabf
MW
891 }
892
df076bdb 893 if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
089d82e8
NTND
894 logerror("Could not bind to %s: %s",
895 ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
896 strerror(errno));
df076bdb
YH
897 close(sockfd);
898 continue; /* not fatal */
899 }
900 if (listen(sockfd, 5) < 0) {
089d82e8
NTND
901 logerror("Could not listen to %s: %s",
902 ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
903 strerror(errno));
df076bdb
YH
904 close(sockfd);
905 continue; /* not fatal */
906 }
907
20276889
AJ
908 flags = fcntl(sockfd, F_GETFD, 0);
909 if (flags >= 0)
910 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
911
2caa3215
AS
912 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
913 socklist->list[socklist->nr++] = sockfd;
914 socknum++;
df076bdb 915
df076bdb
YH
916 if (maxfd < sockfd)
917 maxfd = sockfd;
918 }
919
920 freeaddrinfo(ai0);
921
6573faff
PA
922 return socknum;
923}
924
925#else /* NO_IPV6 */
926
2caa3215 927static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
6573faff
PA
928{
929 struct sockaddr_in sin;
930 int sockfd;
20276889 931 long flags;
6573faff 932
dd467629
JL
933 memset(&sin, 0, sizeof sin);
934 sin.sin_family = AF_INET;
935 sin.sin_port = htons(listen_port);
936
937 if (listen_addr) {
938 /* Well, host better be an IP address here. */
939 if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0)
940 return 0;
941 } else {
942 sin.sin_addr.s_addr = htonl(INADDR_ANY);
943 }
944
6573faff
PA
945 sockfd = socket(AF_INET, SOCK_STREAM, 0);
946 if (sockfd < 0)
947 return 0;
948
1955fabf 949 if (set_reuse_addr(sockfd)) {
089d82e8 950 logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
1955fabf
MW
951 close(sockfd);
952 return 0;
953 }
954
6573faff 955 if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
089d82e8
NTND
956 logerror("Could not listen to %s: %s",
957 ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
958 strerror(errno));
6573faff
PA
959 close(sockfd);
960 return 0;
961 }
a87e8be2 962
f35230fb 963 if (listen(sockfd, 5) < 0) {
089d82e8
NTND
964 logerror("Could not listen to %s: %s",
965 ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
966 strerror(errno));
f35230fb
PS
967 close(sockfd);
968 return 0;
969 }
970
20276889
AJ
971 flags = fcntl(sockfd, F_GETFD, 0);
972 if (flags >= 0)
973 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
974
2caa3215
AS
975 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
976 socklist->list[socklist->nr++] = sockfd;
f35230fb 977 return 1;
6573faff
PA
978}
979
980#endif
981
3a3a29c1 982static void socksetup(struct string_list *listen_addr, int listen_port, struct socketlist *socklist)
2caa3215 983{
3a3a29c1
AS
984 if (!listen_addr->nr)
985 setup_named_sock(NULL, listen_port, socklist);
986 else {
987 int i, socknum;
988 for (i = 0; i < listen_addr->nr; i++) {
989 socknum = setup_named_sock(listen_addr->items[i].string,
990 listen_port, socklist);
991
992 if (socknum == 0)
993 logerror("unable to allocate any listen sockets for host %s on port %u",
994 listen_addr->items[i].string, listen_port);
995 }
996 }
2caa3215
AS
997}
998
999static int service_loop(struct socketlist *socklist)
6573faff
PA
1000{
1001 struct pollfd *pfd;
1002 int i;
1003
2caa3215 1004 pfd = xcalloc(socklist->nr, sizeof(struct pollfd));
6573faff 1005
2caa3215
AS
1006 for (i = 0; i < socklist->nr; i++) {
1007 pfd[i].fd = socklist->list[i];
6573faff
PA
1008 pfd[i].events = POLLIN;
1009 }
9220282a
PA
1010
1011 signal(SIGCHLD, child_handler);
a87e8be2
LT
1012
1013 for (;;) {
df076bdb 1014 int i;
6573faff 1015
695605b5
SB
1016 check_dead_children();
1017
2caa3215 1018 if (poll(pfd, socklist->nr, -1) < 0) {
1eef0b33 1019 if (errno != EINTR) {
df0daf8a 1020 logerror("Poll failed, resuming: %s",
1eef0b33
JH
1021 strerror(errno));
1022 sleep(1);
1023 }
df076bdb
YH
1024 continue;
1025 }
1026
2caa3215 1027 for (i = 0; i < socklist->nr; i++) {
6573faff 1028 if (pfd[i].revents & POLLIN) {
f9c87be6
EFL
1029 union {
1030 struct sockaddr sa;
1031 struct sockaddr_in sai;
1032#ifndef NO_IPV6
1033 struct sockaddr_in6 sai6;
1034#endif
1035 } ss;
c295cf06 1036 socklen_t sslen = sizeof(ss);
f9c87be6 1037 int incoming = accept(pfd[i].fd, &ss.sa, &sslen);
df076bdb
YH
1038 if (incoming < 0) {
1039 switch (errno) {
1040 case EAGAIN:
1041 case EINTR:
1042 case ECONNABORTED:
1043 continue;
1044 default:
d824cbba 1045 die_errno("accept returned");
df076bdb
YH
1046 }
1047 }
f9c87be6 1048 handle(incoming, &ss.sa, sslen);
a87e8be2
LT
1049 }
1050 }
a87e8be2
LT
1051 }
1052}
1053
258e93a1
ML
1054/* if any standard file descriptor is missing open it to /dev/null */
1055static void sanitize_stdfds(void)
1056{
1057 int fd = open("/dev/null", O_RDWR, 0);
1058 while (fd != -1 && fd < 2)
1059 fd = dup(fd);
1060 if (fd == -1)
d824cbba 1061 die_errno("open /dev/null or dup failed");
258e93a1
ML
1062 if (fd > 2)
1063 close(fd);
1064}
1065
a666b472
EFL
1066#ifdef NO_POSIX_GOODIES
1067
1068struct credentials;
1069
1070static void drop_privileges(struct credentials *cred)
1071{
1072 /* nothing */
1073}
1074
1075static void daemonize(void)
1076{
1077 die("--detach not supported on this platform");
1078}
1079
1080static struct credentials *prepare_credentials(const char *user_name,
1081 const char *group_name)
1082{
1083 die("--user not supported on this platform");
1084}
1085
1086#else
1087
1088struct credentials {
1089 struct passwd *pass;
1090 gid_t gid;
1091};
1092
1093static void drop_privileges(struct credentials *cred)
1094{
1095 if (cred && (initgroups(cred->pass->pw_name, cred->gid) ||
1096 setgid (cred->gid) || setuid(cred->pass->pw_uid)))
1097 die("cannot drop privileges");
1098}
1099
1100static struct credentials *prepare_credentials(const char *user_name,
1101 const char *group_name)
1102{
1103 static struct credentials c;
1104
1105 c.pass = getpwnam(user_name);
1106 if (!c.pass)
1107 die("user not found - %s", user_name);
1108
1109 if (!group_name)
1110 c.gid = c.pass->pw_gid;
1111 else {
1112 struct group *group = getgrnam(group_name);
1113 if (!group)
1114 die("group not found - %s", group_name);
1115
1116 c.gid = group->gr_gid;
1117 }
1118
1119 return &c;
1120}
1121
a5262768
ML
1122static void daemonize(void)
1123{
1124 switch (fork()) {
1125 case 0:
1126 break;
1127 case -1:
d824cbba 1128 die_errno("fork failed");
a5262768
ML
1129 default:
1130 exit(0);
1131 }
1132 if (setsid() == -1)
d824cbba 1133 die_errno("setsid failed");
a5262768
ML
1134 close(0);
1135 close(1);
1136 close(2);
1137 sanitize_stdfds();
1138}
a666b472 1139#endif
a5262768 1140
45ed5d7f
ML
1141static void store_pid(const char *path)
1142{
1143 FILE *f = fopen(path, "w");
1144 if (!f)
d824cbba 1145 die_errno("cannot open pid file '%s'", path);
85e72830 1146 if (fprintf(f, "%"PRIuMAX"\n", (uintmax_t) getpid()) < 0 || fclose(f) != 0)
d824cbba 1147 die_errno("failed to write pid file '%s'", path);
45ed5d7f
ML
1148}
1149
a666b472
EFL
1150static int serve(struct string_list *listen_addr, int listen_port,
1151 struct credentials *cred)
6573faff 1152{
2caa3215 1153 struct socketlist socklist = { NULL, 0, 0 };
4ae22d96 1154
2caa3215
AS
1155 socksetup(listen_addr, listen_port, &socklist);
1156 if (socklist.nr == 0)
3a3a29c1
AS
1157 die("unable to allocate any listen sockets on port %u",
1158 listen_port);
4ae22d96 1159
a666b472 1160 drop_privileges(cred);
678dac6b 1161
f6a34cfb
CB
1162 loginfo("Ready to rumble");
1163
2caa3215 1164 return service_loop(&socklist);
4ae22d96 1165}
6573faff 1166
a87e8be2
LT
1167int main(int argc, char **argv)
1168{
dd467629 1169 int listen_port = 0;
3a3a29c1 1170 struct string_list listen_addr = STRING_LIST_INIT_NODUP;
30e15602 1171 int serve_mode = 0, inetd_mode = 0;
678dac6b 1172 const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
a5262768 1173 int detach = 0;
a666b472 1174 struct credentials *cred = NULL;
a87e8be2
LT
1175 int i;
1176
5e9637c6
ÆAB
1177 git_setup_gettext();
1178
2fb3f6db
SP
1179 git_extract_argv0_path(argv[0]);
1180
a87e8be2
LT
1181 for (i = 1; i < argc; i++) {
1182 char *arg = argv[i];
1183
cc44c765 1184 if (!prefixcmp(arg, "--listen=")) {
3a3a29c1 1185 string_list_append(&listen_addr, xstrdup_tolower(arg + 9));
6720e95b 1186 continue;
dd467629 1187 }
cc44c765 1188 if (!prefixcmp(arg, "--port=")) {
a87e8be2
LT
1189 char *end;
1190 unsigned long n;
1191 n = strtoul(arg+7, &end, 0);
1192 if (arg[7] && !*end) {
dd467629 1193 listen_port = n;
a87e8be2
LT
1194 continue;
1195 }
1196 }
30e15602
EFL
1197 if (!strcmp(arg, "--serve")) {
1198 serve_mode = 1;
1199 continue;
1200 }
e64e1b79
LT
1201 if (!strcmp(arg, "--inetd")) {
1202 inetd_mode = 1;
a8883288 1203 log_syslog = 1;
e64e1b79
LT
1204 continue;
1205 }
f8ff0c06
PB
1206 if (!strcmp(arg, "--verbose")) {
1207 verbose = 1;
1208 continue;
1209 }
9048fe1c
PB
1210 if (!strcmp(arg, "--syslog")) {
1211 log_syslog = 1;
9048fe1c
PB
1212 continue;
1213 }
4ae95682
PA
1214 if (!strcmp(arg, "--export-all")) {
1215 export_all_trees = 1;
1216 continue;
1217 }
93741e4a
JH
1218 if (!prefixcmp(arg, "--access-hook=")) {
1219 access_hook = arg + 14;
1220 continue;
1221 }
cc44c765 1222 if (!prefixcmp(arg, "--timeout=")) {
960deccb 1223 timeout = atoi(arg+10);
a8883288 1224 continue;
960deccb 1225 }
cc44c765 1226 if (!prefixcmp(arg, "--init-timeout=")) {
960deccb 1227 init_timeout = atoi(arg+15);
a8883288 1228 continue;
960deccb 1229 }
3bd62c21
SB
1230 if (!prefixcmp(arg, "--max-connections=")) {
1231 max_connections = atoi(arg+18);
1232 if (max_connections < 0)
1233 max_connections = 0; /* unlimited */
1234 continue;
1235 }
4dbd1352
AE
1236 if (!strcmp(arg, "--strict-paths")) {
1237 strict_paths = 1;
1238 continue;
1239 }
cc44c765 1240 if (!prefixcmp(arg, "--base-path=")) {
b21c31c9
PB
1241 base_path = arg+12;
1242 continue;
1243 }
73a7a656
JA
1244 if (!strcmp(arg, "--base-path-relaxed")) {
1245 base_path_relaxed = 1;
1246 continue;
1247 }
cc44c765 1248 if (!prefixcmp(arg, "--interpolated-path=")) {
49ba83fb
JL
1249 interpolated_path = arg+20;
1250 continue;
1251 }
1955fabf
MW
1252 if (!strcmp(arg, "--reuseaddr")) {
1253 reuseaddr = 1;
1254 continue;
1255 }
603968d2
JH
1256 if (!strcmp(arg, "--user-path")) {
1257 user_path = "";
1258 continue;
1259 }
cc44c765 1260 if (!prefixcmp(arg, "--user-path=")) {
603968d2
JH
1261 user_path = arg + 12;
1262 continue;
1263 }
cc44c765 1264 if (!prefixcmp(arg, "--pid-file=")) {
45ed5d7f
ML
1265 pid_file = arg + 11;
1266 continue;
1267 }
a5262768
ML
1268 if (!strcmp(arg, "--detach")) {
1269 detach = 1;
1270 log_syslog = 1;
1271 continue;
1272 }
cc44c765 1273 if (!prefixcmp(arg, "--user=")) {
678dac6b
TS
1274 user_name = arg + 7;
1275 continue;
1276 }
cc44c765 1277 if (!prefixcmp(arg, "--group=")) {
678dac6b
TS
1278 group_name = arg + 8;
1279 continue;
1280 }
cc44c765 1281 if (!prefixcmp(arg, "--enable=")) {
d819e4e6
JH
1282 enable_service(arg + 9, 1);
1283 continue;
1284 }
cc44c765 1285 if (!prefixcmp(arg, "--disable=")) {
d819e4e6
JH
1286 enable_service(arg + 10, 0);
1287 continue;
1288 }
cc44c765 1289 if (!prefixcmp(arg, "--allow-override=")) {
74c0cc21 1290 make_service_overridable(arg + 17, 1);
d819e4e6
JH
1291 continue;
1292 }
cc44c765 1293 if (!prefixcmp(arg, "--forbid-override=")) {
74c0cc21 1294 make_service_overridable(arg + 18, 0);
d819e4e6
JH
1295 continue;
1296 }
d5570f4d
JK
1297 if (!prefixcmp(arg, "--informative-errors")) {
1298 informative_errors = 1;
1299 continue;
1300 }
1301 if (!prefixcmp(arg, "--no-informative-errors")) {
1302 informative_errors = 0;
1303 continue;
1304 }
4ae95682
PA
1305 if (!strcmp(arg, "--")) {
1306 ok_paths = &argv[i+1];
1307 break;
1308 } else if (arg[0] != '-') {
1309 ok_paths = &argv[i];
1310 break;
1311 }
e64e1b79 1312
a87e8be2
LT
1313 usage(daemon_usage);
1314 }
1315
22665bba 1316 if (log_syslog) {
6a992e9e 1317 openlog("git-daemon", LOG_PID, LOG_DAEMON);
22665bba 1318 set_die_routine(daemon_die);
460c2010 1319 } else
48196afd 1320 /* avoid splitting a message in the middle */
48cfaea1 1321 setvbuf(stderr, NULL, _IOFBF, 4096);
22665bba 1322
9cddf56e
EFL
1323 if (inetd_mode && (detach || group_name || user_name))
1324 die("--detach, --user and --group are incompatible with --inetd");
678dac6b 1325
3a3a29c1 1326 if (inetd_mode && (listen_port || (listen_addr.nr > 0)))
dd467629
JL
1327 die("--listen= and --port= are incompatible with --inetd");
1328 else if (listen_port == 0)
1329 listen_port = DEFAULT_GIT_PORT;
1330
678dac6b
TS
1331 if (group_name && !user_name)
1332 die("--group supplied without --user");
1333
a666b472
EFL
1334 if (user_name)
1335 cred = prepare_credentials(user_name, group_name);
678dac6b 1336
ad8b4f56
ML
1337 if (strict_paths && (!ok_paths || !*ok_paths))
1338 die("option --strict-paths requires a whitelist");
1339
90b4a71c
JH
1340 if (base_path && !is_directory(base_path))
1341 die("base-path '%s' does not exist or is not a directory",
1342 base_path);
20632071 1343
7c3693f1 1344 if (inetd_mode) {
30e15602
EFL
1345 if (!freopen("/dev/null", "w", stderr))
1346 die_errno("failed to redirect stderr to /dev/null");
1347 }
1348
f9c87be6
EFL
1349 if (inetd_mode || serve_mode)
1350 return execute();
bce8230d 1351
f6a34cfb 1352 if (detach)
a5262768
ML
1353 daemonize();
1354 else
1355 sanitize_stdfds();
258e93a1 1356
45ed5d7f
ML
1357 if (pid_file)
1358 store_pid(pid_file);
1359
30e15602
EFL
1360 /* prepare argv for serving-processes */
1361 cld_argv = xmalloc(sizeof (char *) * (argc + 2));
081f84ee
JN
1362 cld_argv[0] = argv[0]; /* git-daemon */
1363 cld_argv[1] = "--serve";
1364 for (i = 1; i < argc; ++i)
1365 cld_argv[i+1] = argv[i];
30e15602
EFL
1366 cld_argv[argc+1] = NULL;
1367
a666b472 1368 return serve(&listen_addr, listen_port, cred);
a87e8be2 1369}