daemon: look up client-supplied hostname lazily
[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
2844923d
MD
12#ifdef NO_INITGROUPS
13#define initgroups(x, y) (0) /* nothing */
14#endif
15
9048fe1c 16static int log_syslog;
f8ff0c06 17static int verbose;
1955fabf 18static int reuseaddr;
d5570f4d 19static int informative_errors;
f8ff0c06 20
960deccb 21static const char daemon_usage[] =
1b1dd23f 22"git daemon [--verbose] [--syslog] [--export-all]\n"
62b4698e
ŠN
23" [--timeout=<n>] [--init-timeout=<n>] [--max-connections=<n>]\n"
24" [--strict-paths] [--base-path=<path>] [--base-path-relaxed]\n"
25" [--user-path | --user-path=<path>]\n"
26" [--interpolated-path=<path>]\n"
9cddf56e 27" [--reuseaddr] [--pid-file=<file>]\n"
62b4698e 28" [--(enable|disable|allow-override|forbid-override)=<service>]\n"
93741e4a 29" [--access-hook=<path>]\n"
62b4698e 30" [--inetd | [--listen=<host_or_ipaddr>] [--port=<n>]\n"
9cddf56e 31" [--detach] [--user=<user> [--group=<group>]]\n"
62b4698e 32" [<directory>...]";
4ae95682
PA
33
34/* List of acceptable pathname prefixes */
96f1e58f
DR
35static char **ok_paths;
36static int strict_paths;
4ae95682
PA
37
38/* If this is set, git-daemon-export-ok is not required */
96f1e58f 39static int export_all_trees;
f8ff0c06 40
b21c31c9 41/* Take all paths relative to this one if non-NULL */
1055a890
JK
42static const char *base_path;
43static const char *interpolated_path;
73a7a656 44static int base_path_relaxed;
49ba83fb
JL
45
46/* Flag indicating client sent extra args. */
47static int saw_extended_args;
b21c31c9 48
603968d2
JH
49/* If defined, ~user notation is allowed and the string is inserted
50 * after ~user/. E.g. a request to git://host/~alice/frotz would
51 * go to /home/alice/pub_git/frotz with --user-path=pub_git.
52 */
96f1e58f 53static const char *user_path;
603968d2 54
960deccb 55/* Timeout, and initial timeout */
96f1e58f
DR
56static unsigned int timeout;
57static unsigned int init_timeout;
f8ff0c06 58
9d7ca667
RS
59static char *hostname;
60static char *canon_hostname;
61static char *ip_address;
62static char *tcp_port;
49ba83fb 63
edef953e
RS
64static int hostname_lookup_done;
65
66static void lookup_hostname(void);
67
68static const char *get_canon_hostname(void)
69{
70 lookup_hostname();
71 return canon_hostname;
72}
73
74static const char *get_ip_address(void)
75{
76 lookup_hostname();
77 return ip_address;
78}
79
9048fe1c 80static void logreport(int priority, const char *err, va_list params)
f8ff0c06 81{
9048fe1c 82 if (log_syslog) {
6a992e9e
SB
83 char buf[1024];
84 vsnprintf(buf, sizeof(buf), err, params);
9048fe1c 85 syslog(priority, "%s", buf);
460c2010
JH
86 } else {
87 /*
48cfaea1 88 * Since stderr is set to buffered mode, the
6a992e9e 89 * logging of different processes will not overlap
48cfaea1 90 * unless they overflow the (rather big) buffers.
6a992e9e 91 */
85e72830 92 fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid());
6a992e9e
SB
93 vfprintf(stderr, err, params);
94 fputc('\n', stderr);
48cfaea1 95 fflush(stderr);
6a992e9e 96 }
f8ff0c06
PB
97}
98
28bea9e5 99__attribute__((format (printf, 1, 2)))
cdda4745 100static void logerror(const char *err, ...)
f8ff0c06
PB
101{
102 va_list params;
103 va_start(params, err);
9048fe1c 104 logreport(LOG_ERR, err, params);
f8ff0c06
PB
105 va_end(params);
106}
107
28bea9e5 108__attribute__((format (printf, 1, 2)))
cdda4745 109static void loginfo(const char *err, ...)
f8ff0c06
PB
110{
111 va_list params;
112 if (!verbose)
113 return;
114 va_start(params, err);
9048fe1c 115 logreport(LOG_INFO, err, params);
f8ff0c06
PB
116 va_end(params);
117}
a87e8be2 118
ad8b4f56
ML
119static void NORETURN daemon_die(const char *err, va_list params)
120{
121 logreport(LOG_ERR, err, params);
122 exit(1);
123}
124
1055a890 125static const char *path_ok(const char *directory)
4ae95682 126{
603968d2 127 static char rpath[PATH_MAX];
49ba83fb 128 static char interp_path[PATH_MAX];
1c64b48e 129 const char *path;
1055a890 130 const char *dir;
49ba83fb 131
9d7ca667 132 dir = directory;
d79374c7 133
34b6cb8b 134 if (daemon_avoid_alias(dir)) {
d79374c7
JH
135 logerror("'%s': aliased", dir);
136 return NULL;
137 }
138
603968d2
JH
139 if (*dir == '~') {
140 if (!user_path) {
141 logerror("'%s': User-path not allowed", dir);
142 return NULL;
143 }
144 if (*user_path) {
145 /* Got either "~alice" or "~alice/foo";
146 * rewrite them to "~alice/%s" or
147 * "~alice/%s/foo".
148 */
149 int namlen, restlen = strlen(dir);
1055a890 150 const char *slash = strchr(dir, '/');
603968d2
JH
151 if (!slash)
152 slash = dir + restlen;
153 namlen = slash - dir;
154 restlen -= namlen;
155 loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
156 snprintf(rpath, PATH_MAX, "%.*s/%s%.*s",
157 namlen, dir, user_path, restlen, slash);
158 dir = rpath;
159 }
160 }
49ba83fb 161 else if (interpolated_path && saw_extended_args) {
9d7ca667 162 struct strbuf expanded_path = STRBUF_INIT;
66dbfd55
GV
163 struct strbuf_expand_dict_entry dict[6];
164
165 dict[0].placeholder = "H"; dict[0].value = hostname;
edef953e
RS
166 dict[1].placeholder = "CH"; dict[1].value = get_canon_hostname();
167 dict[2].placeholder = "IP"; dict[2].value = get_ip_address();
66dbfd55
GV
168 dict[3].placeholder = "P"; dict[3].value = tcp_port;
169 dict[4].placeholder = "D"; dict[4].value = directory;
170 dict[5].placeholder = NULL; dict[5].value = NULL;
49ba83fb
JL
171 if (*dir != '/') {
172 /* Allow only absolute */
173 logerror("'%s': Non-absolute path denied (interpolated-path active)", dir);
174 return NULL;
175 }
176
9d7ca667
RS
177 strbuf_expand(&expanded_path, interpolated_path,
178 strbuf_expand_dict_cb, &dict);
179 strlcpy(interp_path, expanded_path.buf, PATH_MAX);
180 strbuf_release(&expanded_path);
49ba83fb
JL
181 loginfo("Interpolated dir '%s'", interp_path);
182
183 dir = interp_path;
184 }
603968d2
JH
185 else if (base_path) {
186 if (*dir != '/') {
187 /* Allow only absolute */
1fda3d55 188 logerror("'%s': Non-absolute path denied (base-path active)", dir);
b21c31c9
PB
189 return NULL;
190 }
49ba83fb
JL
191 snprintf(rpath, PATH_MAX, "%s%s", base_path, dir);
192 dir = rpath;
b21c31c9
PB
193 }
194
a583971f
RS
195 path = enter_repo(dir, strict_paths);
196 if (!path && base_path && base_path_relaxed) {
73a7a656
JA
197 /*
198 * if we fail and base_path_relaxed is enabled, try without
199 * prefixing the base path
200 */
a583971f
RS
201 dir = directory;
202 path = enter_repo(dir, strict_paths);
203 }
3e04c62d 204
4dbd1352 205 if (!path) {
05ac6b34 206 logerror("'%s' does not appear to be a git repository", dir);
4dbd1352 207 return NULL;
4ae95682
PA
208 }
209
210 if ( ok_paths && *ok_paths ) {
ce335fe0 211 char **pp;
4dbd1352 212 int pathlen = strlen(path);
4ae95682 213
ce335fe0 214 /* The validation is done on the paths after enter_repo
a6080a0a 215 * appends optional {.git,.git/.git} and friends, but
d79374c7
JH
216 * it does not use getcwd(). So if your /pub is
217 * a symlink to /mnt/pub, you can whitelist /pub and
218 * do not have to say /mnt/pub.
219 * Do not say /pub/.
ce335fe0 220 */
4ae95682
PA
221 for ( pp = ok_paths ; *pp ; pp++ ) {
222 int len = strlen(*pp);
ce335fe0
JH
223 if (len <= pathlen &&
224 !memcmp(*pp, path, len) &&
225 (path[len] == '\0' ||
226 (!strict_paths && path[len] == '/')))
227 return path;
4ae95682 228 }
4dbd1352
AE
229 }
230 else {
231 /* be backwards compatible */
232 if (!strict_paths)
233 return path;
4ae95682
PA
234 }
235
4dbd1352
AE
236 logerror("'%s': not in whitelist", path);
237 return NULL; /* Fallthrough. Deny by default */
4ae95682 238}
a87e8be2 239
d819e4e6
JH
240typedef int (*daemon_service_fn)(void);
241struct daemon_service {
242 const char *name;
243 const char *config_name;
244 daemon_service_fn fn;
245 int enabled;
246 int overridable;
247};
248
249static struct daemon_service *service_looking_at;
250static int service_enabled;
251
ef90d6d4 252static int git_daemon_config(const char *var, const char *value, void *cb)
d819e4e6 253{
ae021d87
JK
254 const char *service;
255
256 if (skip_prefix(var, "daemon.", &service) &&
257 !strcmp(service, service_looking_at->config_name)) {
d819e4e6
JH
258 service_enabled = git_config_bool(var, value);
259 return 0;
260 }
261
262 /* we are not interested in parsing any other configuration here */
263 return 0;
264}
265
d5570f4d
JK
266static int daemon_error(const char *dir, const char *msg)
267{
268 if (!informative_errors)
269 msg = "access denied or repository not exported";
270 packet_write(1, "ERR %s: %s", msg, dir);
271 return -1;
272}
273
1055a890 274static const char *access_hook;
93741e4a
JH
275
276static int run_access_hook(struct daemon_service *service, const char *dir, const char *path)
277{
278 struct child_process child;
279 struct strbuf buf = STRBUF_INIT;
280 const char *argv[8];
281 const char **arg = argv;
282 char *eol;
283 int seen_errors = 0;
284
285#define STRARG(x) ((x) ? (x) : "")
286 *arg++ = access_hook;
287 *arg++ = service->name;
288 *arg++ = path;
289 *arg++ = STRARG(hostname);
edef953e
RS
290 *arg++ = STRARG(get_canon_hostname());
291 *arg++ = STRARG(get_ip_address());
93741e4a
JH
292 *arg++ = STRARG(tcp_port);
293 *arg = NULL;
294#undef STRARG
295
296 memset(&child, 0, sizeof(child));
297 child.use_shell = 1;
298 child.argv = argv;
299 child.no_stdin = 1;
300 child.no_stderr = 1;
301 child.out = -1;
302 if (start_command(&child)) {
303 logerror("daemon access hook '%s' failed to start",
304 access_hook);
305 goto error_return;
306 }
307 if (strbuf_read(&buf, child.out, 0) < 0) {
308 logerror("failed to read from pipe to daemon access hook '%s'",
309 access_hook);
310 strbuf_reset(&buf);
311 seen_errors = 1;
312 }
313 if (close(child.out) < 0) {
314 logerror("failed to close pipe to daemon access hook '%s'",
315 access_hook);
316 seen_errors = 1;
317 }
318 if (finish_command(&child))
319 seen_errors = 1;
320
321 if (!seen_errors) {
322 strbuf_release(&buf);
323 return 0;
324 }
325
326error_return:
327 strbuf_ltrim(&buf);
328 if (!buf.len)
329 strbuf_addstr(&buf, "service rejected");
330 eol = strchr(buf.buf, '\n');
331 if (eol)
332 *eol = '\0';
333 errno = EACCES;
334 daemon_error(dir, buf.buf);
335 strbuf_release(&buf);
336 return -1;
337}
338
1055a890 339static int run_service(const char *dir, struct daemon_service *service)
a87e8be2 340{
4dbd1352 341 const char *path;
d819e4e6
JH
342 int enabled = service->enabled;
343
a47551c3 344 loginfo("Request %s for '%s'", service->name, dir);
4dbd1352 345
d819e4e6
JH
346 if (!enabled && !service->overridable) {
347 logerror("'%s': service not enabled.", service->name);
348 errno = EACCES;
d5570f4d 349 return daemon_error(dir, "service not enabled");
d819e4e6 350 }
4ae95682 351
a47551c3 352 if (!(path = path_ok(dir)))
d5570f4d 353 return daemon_error(dir, "no such repository");
47888f0f 354
a87e8be2
LT
355 /*
356 * Security on the cheap.
357 *
a935c397 358 * We want a readable HEAD, usable "objects" directory, and
a87e8be2
LT
359 * a "git-daemon-export-ok" flag that says that the other side
360 * is ok with us doing this.
4dbd1352
AE
361 *
362 * path_ok() uses enter_repo() and does whitelist checking.
363 * We only need to make sure the repository is exported.
a87e8be2 364 */
4dbd1352 365
3e04c62d 366 if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
4dbd1352 367 logerror("'%s': repository not exported.", path);
3e04c62d 368 errno = EACCES;
d5570f4d 369 return daemon_error(dir, "repository not exported");
3e04c62d
PA
370 }
371
d819e4e6
JH
372 if (service->overridable) {
373 service_looking_at = service;
374 service_enabled = -1;
ef90d6d4 375 git_config(git_daemon_config, NULL);
d819e4e6
JH
376 if (0 <= service_enabled)
377 enabled = service_enabled;
378 }
379 if (!enabled) {
380 logerror("'%s': service not enabled for '%s'",
381 service->name, path);
382 errno = EACCES;
d5570f4d 383 return daemon_error(dir, "service not enabled");
d819e4e6
JH
384 }
385
93741e4a
JH
386 /*
387 * Optionally, a hook can choose to deny access to the
388 * repository depending on the phase of the moon.
389 */
390 if (access_hook && run_access_hook(service, dir, path))
391 return -1;
392
02d57da4
LT
393 /*
394 * We'll ignore SIGTERM from now on, we have a
395 * good client.
396 */
397 signal(SIGTERM, SIG_IGN);
398
d819e4e6
JH
399 return service->fn();
400}
401
5d87dd4f
JS
402static void copy_to_log(int fd)
403{
404 struct strbuf line = STRBUF_INIT;
405 FILE *fp;
406
407 fp = fdopen(fd, "r");
408 if (fp == NULL) {
409 logerror("fdopen of error channel failed");
410 close(fd);
411 return;
412 }
413
414 while (strbuf_getline(&line, fp, '\n') != EOF) {
415 logerror("%s", line.buf);
416 strbuf_setlen(&line, 0);
417 }
418
419 strbuf_release(&line);
420 fclose(fp);
421}
422
423static int run_service_command(const char **argv)
424{
425 struct child_process cld;
426
427 memset(&cld, 0, sizeof(cld));
428 cld.argv = argv;
429 cld.git_cmd = 1;
430 cld.err = -1;
431 if (start_command(&cld))
432 return -1;
433
434 close(0);
435 close(1);
436
437 copy_to_log(cld.err);
438
439 return finish_command(&cld);
440}
441
d819e4e6
JH
442static int upload_pack(void)
443{
444 /* Timeout as string */
445 char timeout_buf[64];
66dbfd55
GV
446 const char *argv[] = { "upload-pack", "--strict", NULL, ".", NULL };
447
448 argv[2] = timeout_buf;
d819e4e6 449
960deccb 450 snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout);
5d87dd4f 451 return run_service_command(argv);
a87e8be2
LT
452}
453
39345a21
FBH
454static int upload_archive(void)
455{
5d87dd4f
JS
456 static const char *argv[] = { "upload-archive", ".", NULL };
457 return run_service_command(argv);
39345a21
FBH
458}
459
4b3b1e1e
LT
460static int receive_pack(void)
461{
5d87dd4f
JS
462 static const char *argv[] = { "receive-pack", ".", NULL };
463 return run_service_command(argv);
4b3b1e1e
LT
464}
465
d819e4e6 466static struct daemon_service daemon_service[] = {
39345a21 467 { "upload-archive", "uploadarch", upload_archive, 0, 1 },
d819e4e6 468 { "upload-pack", "uploadpack", upload_pack, 1, 1 },
4b3b1e1e 469 { "receive-pack", "receivepack", receive_pack, 0, 1 },
d819e4e6
JH
470};
471
f3fa1838
JH
472static void enable_service(const char *name, int ena)
473{
d819e4e6
JH
474 int i;
475 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
476 if (!strcmp(daemon_service[i].name, name)) {
477 daemon_service[i].enabled = ena;
478 return;
479 }
480 }
481 die("No such service %s", name);
482}
483
f3fa1838
JH
484static void make_service_overridable(const char *name, int ena)
485{
d819e4e6
JH
486 int i;
487 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
488 if (!strcmp(daemon_service[i].name, name)) {
489 daemon_service[i].overridable = ena;
490 return;
491 }
492 }
493 die("No such service %s", name);
494}
495
e8dbd76d
IL
496static void parse_host_and_port(char *hostport, char **host,
497 char **port)
498{
499 if (*hostport == '[') {
500 char *end;
501
502 end = strchr(hostport, ']');
503 if (!end)
9517e6b8 504 die("Invalid request ('[' without ']')");
e8dbd76d
IL
505 *end = '\0';
506 *host = hostport + 1;
507 if (!end[1])
508 *port = NULL;
509 else if (end[1] == ':')
510 *port = end + 2;
511 else
512 die("Garbage after end of host part");
513 } else {
514 *host = hostport;
515 *port = strrchr(hostport, ':');
516 if (*port) {
e9bd3235 517 **port = '\0';
e8dbd76d
IL
518 ++*port;
519 }
520 }
521}
522
eb30aed7 523/*
73bb33a9 524 * Read the host as supplied by the client connection.
eb30aed7 525 */
73bb33a9 526static void parse_host_arg(char *extra_args, int buflen)
49ba83fb
JL
527{
528 char *val;
529 int vallen;
530 char *end = extra_args + buflen;
531
73bb33a9 532 if (extra_args < end && *extra_args) {
49ba83fb
JL
533 saw_extended_args = 1;
534 if (strncasecmp("host=", extra_args, 5) == 0) {
535 val = extra_args + 5;
536 vallen = strlen(val) + 1;
537 if (*val) {
eb30aed7 538 /* Split <host>:<port> at colon. */
e8dbd76d
IL
539 char *host;
540 char *port;
541 parse_host_and_port(val, &host, &port);
dd467629 542 if (port) {
9d7ca667
RS
543 free(tcp_port);
544 tcp_port = xstrdup(port);
dd467629 545 }
9d7ca667 546 free(hostname);
6720e95b 547 hostname = xstrdup_tolower(host);
edef953e 548 hostname_lookup_done = 0;
49ba83fb 549 }
eb30aed7 550
49ba83fb
JL
551 /* On to the next one */
552 extra_args = val + vallen;
553 }
73bb33a9
SP
554 if (extra_args < end && *extra_args)
555 die("Invalid request");
49ba83fb 556 }
edef953e 557}
dd467629 558
edef953e
RS
559/*
560 * Locate canonical hostname and its IP address.
561 */
562static void lookup_hostname(void)
563{
564 if (!hostname_lookup_done && hostname) {
dd467629 565#ifndef NO_IPV6
dd467629 566 struct addrinfo hints;
3e8a00ae 567 struct addrinfo *ai;
dd467629
JL
568 int gai;
569 static char addrbuf[HOST_NAME_MAX + 1];
570
571 memset(&hints, 0, sizeof(hints));
572 hints.ai_flags = AI_CANONNAME;
573
2af202be 574 gai = getaddrinfo(hostname, NULL, &hints, &ai);
dd467629 575 if (!gai) {
3e8a00ae
BK
576 struct sockaddr_in *sin_addr = (void *)ai->ai_addr;
577
578 inet_ntop(AF_INET, &sin_addr->sin_addr,
579 addrbuf, sizeof(addrbuf));
580 free(ip_address);
581 ip_address = xstrdup(addrbuf);
582
583 free(canon_hostname);
584 canon_hostname = xstrdup(ai->ai_canonname ?
585 ai->ai_canonname : ip_address);
586
587 freeaddrinfo(ai);
dd467629 588 }
dd467629 589#else
dd467629
JL
590 struct hostent *hent;
591 struct sockaddr_in sa;
592 char **ap;
593 static char addrbuf[HOST_NAME_MAX + 1];
594
9d7ca667 595 hent = gethostbyname(hostname);
eb6c4035
RS
596 if (hent) {
597 ap = hent->h_addr_list;
598 memset(&sa, 0, sizeof sa);
599 sa.sin_family = hent->h_addrtype;
600 sa.sin_port = htons(0);
601 memcpy(&sa.sin_addr, *ap, hent->h_length);
602
603 inet_ntop(hent->h_addrtype, &sa.sin_addr,
604 addrbuf, sizeof(addrbuf));
dd467629 605
eb6c4035
RS
606 free(canon_hostname);
607 canon_hostname = xstrdup(hent->h_name);
608 free(ip_address);
609 ip_address = xstrdup(addrbuf);
610 }
dd467629 611#endif
edef953e 612 hostname_lookup_done = 1;
6720e95b 613 }
dd467629
JL
614}
615
616
f9c87be6 617static int execute(void)
a87e8be2 618{
74543a04 619 char *line = packet_buffer;
d819e4e6 620 int pktlen, len, i;
f9c87be6 621 char *addr = getenv("REMOTE_ADDR"), *port = getenv("REMOTE_PORT");
7d80694a 622
f9c87be6
EFL
623 if (addr)
624 loginfo("Connection from %s:%s", addr, port);
5b276ee4 625
960deccb 626 alarm(init_timeout ? init_timeout : timeout);
4981fe75 627 pktlen = packet_read(0, NULL, NULL, packet_buffer, sizeof(packet_buffer), 0);
960deccb 628 alarm(0);
7d80694a 629
5ad312be
JL
630 len = strlen(line);
631 if (pktlen != len)
632 loginfo("Extended attributes (%d bytes) exist <%.*s>",
633 (int) pktlen - len,
634 (int) pktlen - len, line + len + 1);
83543a24 635 if (len && line[len-1] == '\n') {
7d80694a 636 line[--len] = 0;
83543a24
JH
637 pktlen--;
638 }
7d80694a 639
9d7ca667
RS
640 free(hostname);
641 free(canon_hostname);
642 free(ip_address);
643 free(tcp_port);
a47551c3 644 hostname = canon_hostname = ip_address = tcp_port = NULL;
eb30aed7 645
d433ed0b 646 if (len != pktlen)
73bb33a9 647 parse_host_arg(line + len + 1, pktlen - len - 1);
49ba83fb 648
d819e4e6
JH
649 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
650 struct daemon_service *s = &(daemon_service[i]);
d12c24d2
JK
651 const char *arg;
652
653 if (skip_prefix(line, "git-", &arg) &&
654 skip_prefix(arg, s->name, &arg) &&
655 *arg++ == ' ') {
eb30aed7
JL
656 /*
657 * Note: The directory here is probably context sensitive,
658 * and might depend on the actual service being performed.
659 */
d12c24d2 660 return run_service(arg, s);
49ba83fb 661 }
d819e4e6 662 }
a87e8be2 663
f8ff0c06 664 logerror("Protocol error: '%s'", line);
a87e8be2
LT
665 return -1;
666}
667
15515b73
EFL
668static int addrcmp(const struct sockaddr_storage *s1,
669 const struct sockaddr_storage *s2)
670{
3aff874a
BC
671 const struct sockaddr *sa1 = (const struct sockaddr*) s1;
672 const struct sockaddr *sa2 = (const struct sockaddr*) s2;
673
674 if (sa1->sa_family != sa2->sa_family)
675 return sa1->sa_family - sa2->sa_family;
676 if (sa1->sa_family == AF_INET)
15515b73
EFL
677 return memcmp(&((struct sockaddr_in *)s1)->sin_addr,
678 &((struct sockaddr_in *)s2)->sin_addr,
679 sizeof(struct in_addr));
680#ifndef NO_IPV6
3aff874a 681 if (sa1->sa_family == AF_INET6)
15515b73
EFL
682 return memcmp(&((struct sockaddr_in6 *)s1)->sin6_addr,
683 &((struct sockaddr_in6 *)s2)->sin6_addr,
684 sizeof(struct in6_addr));
685#endif
686 return 0;
687}
688
3bd62c21 689static int max_connections = 32;
66e631de 690
3bd62c21 691static unsigned int live_children;
66e631de 692
4d8fa916 693static struct child {
3bd62c21 694 struct child *next;
30e15602 695 struct child_process cld;
df076bdb 696 struct sockaddr_storage address;
3bd62c21 697} *firstborn;
66e631de 698
c295cf06 699static void add_child(struct child_process *cld, struct sockaddr *addr, socklen_t addrlen)
66e631de 700{
460c2010
JH
701 struct child *newborn, **cradle;
702
460c2010
JH
703 newborn = xcalloc(1, sizeof(*newborn));
704 live_children++;
30e15602 705 memcpy(&newborn->cld, cld, sizeof(*cld));
460c2010
JH
706 memcpy(&newborn->address, addr, addrlen);
707 for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next)
15515b73 708 if (!addrcmp(&(*cradle)->address, &newborn->address))
460c2010
JH
709 break;
710 newborn->next = *cradle;
711 *cradle = newborn;
66e631de
LT
712}
713
66e631de
LT
714/*
715 * This gets called if the number of connections grows
716 * past "max_connections".
717 *
3bd62c21 718 * We kill the newest connection from a duplicate IP.
66e631de 719 */
3bd62c21 720static void kill_some_child(void)
66e631de 721{
460c2010 722 const struct child *blanket, *next;
66e631de 723
460c2010
JH
724 if (!(blanket = firstborn))
725 return;
695605b5 726
460c2010 727 for (; (next = blanket->next); blanket = next)
15515b73 728 if (!addrcmp(&blanket->address, &next->address)) {
30e15602 729 kill(blanket->cld.pid, SIGTERM);
460c2010
JH
730 break;
731 }
a5a9126b
JS
732}
733
3bd62c21 734static void check_dead_children(void)
a87e8be2 735{
3bd62c21
SB
736 int status;
737 pid_t pid;
02d57da4 738
30e15602
EFL
739 struct child **cradle, *blanket;
740 for (cradle = &firstborn; (blanket = *cradle);)
741 if ((pid = waitpid(blanket->cld.pid, &status, WNOHANG)) > 1) {
742 const char *dead = "";
743 if (status)
744 dead = " (with error)";
745 loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead);
746
747 /* remove the child */
748 *cradle = blanket->next;
749 live_children--;
750 free(blanket);
751 } else
752 cradle = &blanket->next;
02d57da4
LT
753}
754
30e15602 755static char **cld_argv;
c295cf06 756static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen)
02d57da4 757{
c2e86add 758 struct child_process cld = { NULL };
f9c87be6
EFL
759 char addrbuf[300] = "REMOTE_ADDR=", portbuf[300];
760 char *env[] = { addrbuf, portbuf, NULL };
02d57da4 761
3bd62c21
SB
762 if (max_connections && live_children >= max_connections) {
763 kill_some_child();
460c2010 764 sleep(1); /* give it some time to die */
3bd62c21
SB
765 check_dead_children();
766 if (live_children >= max_connections) {
767 close(incoming);
768 logerror("Too many children, dropping connection");
769 return;
770 }
771 }
02d57da4 772
f9c87be6
EFL
773 if (addr->sa_family == AF_INET) {
774 struct sockaddr_in *sin_addr = (void *) addr;
775 inet_ntop(addr->sa_family, &sin_addr->sin_addr, addrbuf + 12,
776 sizeof(addrbuf) - 12);
777 snprintf(portbuf, sizeof(portbuf), "REMOTE_PORT=%d",
778 ntohs(sin_addr->sin_port));
779#ifndef NO_IPV6
5d9cfa29 780 } else if (addr->sa_family == AF_INET6) {
f9c87be6
EFL
781 struct sockaddr_in6 *sin6_addr = (void *) addr;
782
783 char *buf = addrbuf + 12;
784 *buf++ = '['; *buf = '\0'; /* stpcpy() is cool */
785 inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf,
786 sizeof(addrbuf) - 13);
787 strcat(buf, "]");
788
789 snprintf(portbuf, sizeof(portbuf), "REMOTE_PORT=%d",
790 ntohs(sin6_addr->sin6_port));
791#endif
792 }
793
794 cld.env = (const char **)env;
30e15602
EFL
795 cld.argv = (const char **)cld_argv;
796 cld.in = incoming;
797 cld.out = dup(incoming);
a87e8be2 798
30e15602
EFL
799 if (start_command(&cld))
800 logerror("unable to fork");
801 else
802 add_child(&cld, addr, addrlen);
a87e8be2
LT
803}
804
eaa94919
LT
805static void child_handler(int signo)
806{
460c2010
JH
807 /*
808 * Otherwise empty handler because systemcalls will get interrupted
695605b5
SB
809 * upon signal receipt
810 * SysV needs the handler to be rearmed
811 */
bd7b371e 812 signal(SIGCHLD, child_handler);
eaa94919
LT
813}
814
1955fabf
MW
815static int set_reuse_addr(int sockfd)
816{
817 int on = 1;
818
819 if (!reuseaddr)
820 return 0;
821 return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
822 &on, sizeof(on));
823}
824
2caa3215
AS
825struct socketlist {
826 int *list;
827 size_t nr;
828 size_t alloc;
829};
830
089d82e8
NTND
831static const char *ip2str(int family, struct sockaddr *sin, socklen_t len)
832{
833#ifdef NO_IPV6
834 static char ip[INET_ADDRSTRLEN];
835#else
836 static char ip[INET6_ADDRSTRLEN];
837#endif
838
839 switch (family) {
840#ifndef NO_IPV6
841 case AF_INET6:
842 inet_ntop(family, &((struct sockaddr_in6*)sin)->sin6_addr, ip, len);
843 break;
844#endif
845 case AF_INET:
846 inet_ntop(family, &((struct sockaddr_in*)sin)->sin_addr, ip, len);
847 break;
848 default:
849 strcpy(ip, "<unknown>");
850 }
851 return ip;
852}
853
6573faff
PA
854#ifndef NO_IPV6
855
2caa3215 856static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
a87e8be2 857{
2caa3215 858 int socknum = 0;
df076bdb 859 char pbuf[NI_MAXSERV];
6573faff
PA
860 struct addrinfo hints, *ai0, *ai;
861 int gai;
20276889 862 long flags;
df076bdb 863
dd467629 864 sprintf(pbuf, "%d", listen_port);
df076bdb
YH
865 memset(&hints, 0, sizeof(hints));
866 hints.ai_family = AF_UNSPEC;
867 hints.ai_socktype = SOCK_STREAM;
868 hints.ai_protocol = IPPROTO_TCP;
869 hints.ai_flags = AI_PASSIVE;
870
dd467629 871 gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0);
2caa3215
AS
872 if (gai) {
873 logerror("getaddrinfo() for %s failed: %s", listen_addr, gai_strerror(gai));
874 return 0;
875 }
df076bdb 876
df076bdb
YH
877 for (ai = ai0; ai; ai = ai->ai_next) {
878 int sockfd;
df076bdb
YH
879
880 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
881 if (sockfd < 0)
882 continue;
883 if (sockfd >= FD_SETSIZE) {
df0daf8a 884 logerror("Socket descriptor too large");
df076bdb
YH
885 close(sockfd);
886 continue;
887 }
888
889#ifdef IPV6_V6ONLY
890 if (ai->ai_family == AF_INET6) {
891 int on = 1;
892 setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
893 &on, sizeof(on));
894 /* Note: error is not fatal */
895 }
896#endif
897
1955fabf 898 if (set_reuse_addr(sockfd)) {
089d82e8 899 logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
1955fabf 900 close(sockfd);
0032d548 901 continue;
1955fabf
MW
902 }
903
df076bdb 904 if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
089d82e8
NTND
905 logerror("Could not bind to %s: %s",
906 ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
907 strerror(errno));
df076bdb
YH
908 close(sockfd);
909 continue; /* not fatal */
910 }
911 if (listen(sockfd, 5) < 0) {
089d82e8
NTND
912 logerror("Could not listen to %s: %s",
913 ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
914 strerror(errno));
df076bdb
YH
915 close(sockfd);
916 continue; /* not fatal */
917 }
918
20276889
AJ
919 flags = fcntl(sockfd, F_GETFD, 0);
920 if (flags >= 0)
921 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
922
2caa3215
AS
923 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
924 socklist->list[socklist->nr++] = sockfd;
925 socknum++;
df076bdb
YH
926 }
927
928 freeaddrinfo(ai0);
929
6573faff
PA
930 return socknum;
931}
932
933#else /* NO_IPV6 */
934
2caa3215 935static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
6573faff
PA
936{
937 struct sockaddr_in sin;
938 int sockfd;
20276889 939 long flags;
6573faff 940
dd467629
JL
941 memset(&sin, 0, sizeof sin);
942 sin.sin_family = AF_INET;
943 sin.sin_port = htons(listen_port);
944
945 if (listen_addr) {
946 /* Well, host better be an IP address here. */
947 if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0)
948 return 0;
949 } else {
950 sin.sin_addr.s_addr = htonl(INADDR_ANY);
951 }
952
6573faff
PA
953 sockfd = socket(AF_INET, SOCK_STREAM, 0);
954 if (sockfd < 0)
955 return 0;
956
1955fabf 957 if (set_reuse_addr(sockfd)) {
089d82e8 958 logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
1955fabf
MW
959 close(sockfd);
960 return 0;
961 }
962
6573faff 963 if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
9d1b9aa9 964 logerror("Could not bind to %s: %s",
089d82e8
NTND
965 ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
966 strerror(errno));
6573faff
PA
967 close(sockfd);
968 return 0;
969 }
a87e8be2 970
f35230fb 971 if (listen(sockfd, 5) < 0) {
089d82e8
NTND
972 logerror("Could not listen to %s: %s",
973 ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
974 strerror(errno));
f35230fb
PS
975 close(sockfd);
976 return 0;
977 }
978
20276889
AJ
979 flags = fcntl(sockfd, F_GETFD, 0);
980 if (flags >= 0)
981 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
982
2caa3215
AS
983 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
984 socklist->list[socklist->nr++] = sockfd;
f35230fb 985 return 1;
6573faff
PA
986}
987
988#endif
989
3a3a29c1 990static void socksetup(struct string_list *listen_addr, int listen_port, struct socketlist *socklist)
2caa3215 991{
3a3a29c1
AS
992 if (!listen_addr->nr)
993 setup_named_sock(NULL, listen_port, socklist);
994 else {
995 int i, socknum;
996 for (i = 0; i < listen_addr->nr; i++) {
997 socknum = setup_named_sock(listen_addr->items[i].string,
998 listen_port, socklist);
999
1000 if (socknum == 0)
1001 logerror("unable to allocate any listen sockets for host %s on port %u",
1002 listen_addr->items[i].string, listen_port);
1003 }
1004 }
2caa3215
AS
1005}
1006
1007static int service_loop(struct socketlist *socklist)
6573faff
PA
1008{
1009 struct pollfd *pfd;
1010 int i;
1011
2caa3215 1012 pfd = xcalloc(socklist->nr, sizeof(struct pollfd));
6573faff 1013
2caa3215
AS
1014 for (i = 0; i < socklist->nr; i++) {
1015 pfd[i].fd = socklist->list[i];
6573faff
PA
1016 pfd[i].events = POLLIN;
1017 }
9220282a
PA
1018
1019 signal(SIGCHLD, child_handler);
a87e8be2
LT
1020
1021 for (;;) {
df076bdb 1022 int i;
6573faff 1023
695605b5
SB
1024 check_dead_children();
1025
2caa3215 1026 if (poll(pfd, socklist->nr, -1) < 0) {
1eef0b33 1027 if (errno != EINTR) {
df0daf8a 1028 logerror("Poll failed, resuming: %s",
1eef0b33
JH
1029 strerror(errno));
1030 sleep(1);
1031 }
df076bdb
YH
1032 continue;
1033 }
1034
2caa3215 1035 for (i = 0; i < socklist->nr; i++) {
6573faff 1036 if (pfd[i].revents & POLLIN) {
f9c87be6
EFL
1037 union {
1038 struct sockaddr sa;
1039 struct sockaddr_in sai;
1040#ifndef NO_IPV6
1041 struct sockaddr_in6 sai6;
1042#endif
1043 } ss;
c295cf06 1044 socklen_t sslen = sizeof(ss);
f9c87be6 1045 int incoming = accept(pfd[i].fd, &ss.sa, &sslen);
df076bdb
YH
1046 if (incoming < 0) {
1047 switch (errno) {
1048 case EAGAIN:
1049 case EINTR:
1050 case ECONNABORTED:
1051 continue;
1052 default:
d824cbba 1053 die_errno("accept returned");
df076bdb
YH
1054 }
1055 }
f9c87be6 1056 handle(incoming, &ss.sa, sslen);
a87e8be2
LT
1057 }
1058 }
a87e8be2
LT
1059 }
1060}
1061
a666b472
EFL
1062#ifdef NO_POSIX_GOODIES
1063
1064struct credentials;
1065
1066static void drop_privileges(struct credentials *cred)
1067{
1068 /* nothing */
1069}
1070
a666b472
EFL
1071static struct credentials *prepare_credentials(const char *user_name,
1072 const char *group_name)
1073{
1074 die("--user not supported on this platform");
1075}
1076
1077#else
1078
1079struct credentials {
1080 struct passwd *pass;
1081 gid_t gid;
1082};
1083
1084static void drop_privileges(struct credentials *cred)
1085{
1086 if (cred && (initgroups(cred->pass->pw_name, cred->gid) ||
1087 setgid (cred->gid) || setuid(cred->pass->pw_uid)))
1088 die("cannot drop privileges");
1089}
1090
1091static struct credentials *prepare_credentials(const char *user_name,
1092 const char *group_name)
1093{
1094 static struct credentials c;
1095
1096 c.pass = getpwnam(user_name);
1097 if (!c.pass)
1098 die("user not found - %s", user_name);
1099
1100 if (!group_name)
1101 c.gid = c.pass->pw_gid;
1102 else {
1103 struct group *group = getgrnam(group_name);
1104 if (!group)
1105 die("group not found - %s", group_name);
1106
1107 c.gid = group->gr_gid;
1108 }
1109
1110 return &c;
1111}
a666b472 1112#endif
a5262768 1113
45ed5d7f
ML
1114static void store_pid(const char *path)
1115{
1116 FILE *f = fopen(path, "w");
1117 if (!f)
d824cbba 1118 die_errno("cannot open pid file '%s'", path);
85e72830 1119 if (fprintf(f, "%"PRIuMAX"\n", (uintmax_t) getpid()) < 0 || fclose(f) != 0)
d824cbba 1120 die_errno("failed to write pid file '%s'", path);
45ed5d7f
ML
1121}
1122
a666b472
EFL
1123static int serve(struct string_list *listen_addr, int listen_port,
1124 struct credentials *cred)
6573faff 1125{
2caa3215 1126 struct socketlist socklist = { NULL, 0, 0 };
4ae22d96 1127
2caa3215
AS
1128 socksetup(listen_addr, listen_port, &socklist);
1129 if (socklist.nr == 0)
3a3a29c1
AS
1130 die("unable to allocate any listen sockets on port %u",
1131 listen_port);
4ae22d96 1132
a666b472 1133 drop_privileges(cred);
678dac6b 1134
f6a34cfb
CB
1135 loginfo("Ready to rumble");
1136
2caa3215 1137 return service_loop(&socklist);
4ae22d96 1138}
6573faff 1139
a87e8be2
LT
1140int main(int argc, char **argv)
1141{
dd467629 1142 int listen_port = 0;
3a3a29c1 1143 struct string_list listen_addr = STRING_LIST_INIT_NODUP;
30e15602 1144 int serve_mode = 0, inetd_mode = 0;
678dac6b 1145 const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
a5262768 1146 int detach = 0;
a666b472 1147 struct credentials *cred = NULL;
a87e8be2
LT
1148 int i;
1149
5e9637c6
ÆAB
1150 git_setup_gettext();
1151
2fb3f6db
SP
1152 git_extract_argv0_path(argv[0]);
1153
a87e8be2
LT
1154 for (i = 1; i < argc; i++) {
1155 char *arg = argv[i];
ae021d87 1156 const char *v;
a87e8be2 1157
ae021d87
JK
1158 if (skip_prefix(arg, "--listen=", &v)) {
1159 string_list_append(&listen_addr, xstrdup_tolower(v));
6720e95b 1160 continue;
dd467629 1161 }
ae021d87 1162 if (skip_prefix(arg, "--port=", &v)) {
a87e8be2
LT
1163 char *end;
1164 unsigned long n;
ae021d87
JK
1165 n = strtoul(v, &end, 0);
1166 if (*v && !*end) {
dd467629 1167 listen_port = n;
a87e8be2
LT
1168 continue;
1169 }
1170 }
30e15602
EFL
1171 if (!strcmp(arg, "--serve")) {
1172 serve_mode = 1;
1173 continue;
1174 }
e64e1b79
LT
1175 if (!strcmp(arg, "--inetd")) {
1176 inetd_mode = 1;
a8883288 1177 log_syslog = 1;
e64e1b79
LT
1178 continue;
1179 }
f8ff0c06
PB
1180 if (!strcmp(arg, "--verbose")) {
1181 verbose = 1;
1182 continue;
1183 }
9048fe1c
PB
1184 if (!strcmp(arg, "--syslog")) {
1185 log_syslog = 1;
9048fe1c
PB
1186 continue;
1187 }
4ae95682
PA
1188 if (!strcmp(arg, "--export-all")) {
1189 export_all_trees = 1;
1190 continue;
1191 }
ae021d87
JK
1192 if (skip_prefix(arg, "--access-hook=", &v)) {
1193 access_hook = v;
93741e4a
JH
1194 continue;
1195 }
ae021d87
JK
1196 if (skip_prefix(arg, "--timeout=", &v)) {
1197 timeout = atoi(v);
a8883288 1198 continue;
960deccb 1199 }
ae021d87
JK
1200 if (skip_prefix(arg, "--init-timeout=", &v)) {
1201 init_timeout = atoi(v);
a8883288 1202 continue;
960deccb 1203 }
ae021d87
JK
1204 if (skip_prefix(arg, "--max-connections=", &v)) {
1205 max_connections = atoi(v);
3bd62c21
SB
1206 if (max_connections < 0)
1207 max_connections = 0; /* unlimited */
1208 continue;
1209 }
4dbd1352
AE
1210 if (!strcmp(arg, "--strict-paths")) {
1211 strict_paths = 1;
1212 continue;
1213 }
ae021d87
JK
1214 if (skip_prefix(arg, "--base-path=", &v)) {
1215 base_path = v;
b21c31c9
PB
1216 continue;
1217 }
73a7a656
JA
1218 if (!strcmp(arg, "--base-path-relaxed")) {
1219 base_path_relaxed = 1;
1220 continue;
1221 }
ae021d87
JK
1222 if (skip_prefix(arg, "--interpolated-path=", &v)) {
1223 interpolated_path = v;
49ba83fb
JL
1224 continue;
1225 }
1955fabf
MW
1226 if (!strcmp(arg, "--reuseaddr")) {
1227 reuseaddr = 1;
1228 continue;
1229 }
603968d2
JH
1230 if (!strcmp(arg, "--user-path")) {
1231 user_path = "";
1232 continue;
1233 }
ae021d87
JK
1234 if (skip_prefix(arg, "--user-path=", &v)) {
1235 user_path = v;
603968d2
JH
1236 continue;
1237 }
ae021d87
JK
1238 if (skip_prefix(arg, "--pid-file=", &v)) {
1239 pid_file = v;
45ed5d7f
ML
1240 continue;
1241 }
a5262768
ML
1242 if (!strcmp(arg, "--detach")) {
1243 detach = 1;
1244 log_syslog = 1;
1245 continue;
1246 }
ae021d87
JK
1247 if (skip_prefix(arg, "--user=", &v)) {
1248 user_name = v;
678dac6b
TS
1249 continue;
1250 }
ae021d87
JK
1251 if (skip_prefix(arg, "--group=", &v)) {
1252 group_name = v;
678dac6b
TS
1253 continue;
1254 }
ae021d87
JK
1255 if (skip_prefix(arg, "--enable=", &v)) {
1256 enable_service(v, 1);
d819e4e6
JH
1257 continue;
1258 }
ae021d87
JK
1259 if (skip_prefix(arg, "--disable=", &v)) {
1260 enable_service(v, 0);
d819e4e6
JH
1261 continue;
1262 }
ae021d87
JK
1263 if (skip_prefix(arg, "--allow-override=", &v)) {
1264 make_service_overridable(v, 1);
d819e4e6
JH
1265 continue;
1266 }
ae021d87
JK
1267 if (skip_prefix(arg, "--forbid-override=", &v)) {
1268 make_service_overridable(v, 0);
d819e4e6
JH
1269 continue;
1270 }
82246b76 1271 if (!strcmp(arg, "--informative-errors")) {
d5570f4d
JK
1272 informative_errors = 1;
1273 continue;
1274 }
82246b76 1275 if (!strcmp(arg, "--no-informative-errors")) {
d5570f4d
JK
1276 informative_errors = 0;
1277 continue;
1278 }
4ae95682
PA
1279 if (!strcmp(arg, "--")) {
1280 ok_paths = &argv[i+1];
1281 break;
1282 } else if (arg[0] != '-') {
1283 ok_paths = &argv[i];
1284 break;
1285 }
e64e1b79 1286
a87e8be2
LT
1287 usage(daemon_usage);
1288 }
1289
22665bba 1290 if (log_syslog) {
6a992e9e 1291 openlog("git-daemon", LOG_PID, LOG_DAEMON);
22665bba 1292 set_die_routine(daemon_die);
460c2010 1293 } else
48196afd 1294 /* avoid splitting a message in the middle */
48cfaea1 1295 setvbuf(stderr, NULL, _IOFBF, 4096);
22665bba 1296
9cddf56e
EFL
1297 if (inetd_mode && (detach || group_name || user_name))
1298 die("--detach, --user and --group are incompatible with --inetd");
678dac6b 1299
3a3a29c1 1300 if (inetd_mode && (listen_port || (listen_addr.nr > 0)))
dd467629
JL
1301 die("--listen= and --port= are incompatible with --inetd");
1302 else if (listen_port == 0)
1303 listen_port = DEFAULT_GIT_PORT;
1304
678dac6b
TS
1305 if (group_name && !user_name)
1306 die("--group supplied without --user");
1307
a666b472
EFL
1308 if (user_name)
1309 cred = prepare_credentials(user_name, group_name);
678dac6b 1310
ad8b4f56
ML
1311 if (strict_paths && (!ok_paths || !*ok_paths))
1312 die("option --strict-paths requires a whitelist");
1313
90b4a71c
JH
1314 if (base_path && !is_directory(base_path))
1315 die("base-path '%s' does not exist or is not a directory",
1316 base_path);
20632071 1317
7c3693f1 1318 if (inetd_mode) {
30e15602
EFL
1319 if (!freopen("/dev/null", "w", stderr))
1320 die_errno("failed to redirect stderr to /dev/null");
1321 }
1322
f9c87be6
EFL
1323 if (inetd_mode || serve_mode)
1324 return execute();
bce8230d 1325
de0957ce
NTND
1326 if (detach) {
1327 if (daemonize())
1328 die("--detach not supported on this platform");
1329 } else
a5262768 1330 sanitize_stdfds();
258e93a1 1331
45ed5d7f
ML
1332 if (pid_file)
1333 store_pid(pid_file);
1334
30e15602
EFL
1335 /* prepare argv for serving-processes */
1336 cld_argv = xmalloc(sizeof (char *) * (argc + 2));
081f84ee
JN
1337 cld_argv[0] = argv[0]; /* git-daemon */
1338 cld_argv[1] = "--serve";
1339 for (i = 1; i < argc; ++i)
1340 cld_argv[i+1] = argv[i];
30e15602
EFL
1341 cld_argv[argc+1] = NULL;
1342
a666b472 1343 return serve(&listen_addr, listen_port, cred);
a87e8be2 1344}