protocol: introduce protocol extension mechanisms
[git/git.git] / daemon.c
CommitLineData
979e32fa 1#include "cache.h"
b2141fc1 2#include "config.h"
85023577 3#include "pkt-line.h"
5d87dd4f
JS
4#include "run-command.h"
5#include "strbuf.h"
3a3a29c1 6#include "string-list.h"
f8ff0c06 7
2844923d
MD
8#ifdef NO_INITGROUPS
9#define initgroups(x, y) (0) /* nothing */
10#endif
11
9048fe1c 12static int log_syslog;
f8ff0c06 13static int verbose;
1955fabf 14static int reuseaddr;
d5570f4d 15static int informative_errors;
f8ff0c06 16
960deccb 17static const char daemon_usage[] =
1b1dd23f 18"git daemon [--verbose] [--syslog] [--export-all]\n"
62b4698e
ŠN
19" [--timeout=<n>] [--init-timeout=<n>] [--max-connections=<n>]\n"
20" [--strict-paths] [--base-path=<path>] [--base-path-relaxed]\n"
21" [--user-path | --user-path=<path>]\n"
22" [--interpolated-path=<path>]\n"
9cddf56e 23" [--reuseaddr] [--pid-file=<file>]\n"
62b4698e 24" [--(enable|disable|allow-override|forbid-override)=<service>]\n"
93741e4a 25" [--access-hook=<path>]\n"
62b4698e 26" [--inetd | [--listen=<host_or_ipaddr>] [--port=<n>]\n"
9cddf56e 27" [--detach] [--user=<user> [--group=<group>]]\n"
62b4698e 28" [<directory>...]";
4ae95682
PA
29
30/* List of acceptable pathname prefixes */
3f2e2297 31static const char **ok_paths;
96f1e58f 32static int strict_paths;
4ae95682
PA
33
34/* If this is set, git-daemon-export-ok is not required */
96f1e58f 35static int export_all_trees;
f8ff0c06 36
b21c31c9 37/* Take all paths relative to this one if non-NULL */
1055a890
JK
38static const char *base_path;
39static const char *interpolated_path;
73a7a656 40static int base_path_relaxed;
49ba83fb 41
603968d2
JH
42/* If defined, ~user notation is allowed and the string is inserted
43 * after ~user/. E.g. a request to git://host/~alice/frotz would
44 * go to /home/alice/pub_git/frotz with --user-path=pub_git.
45 */
96f1e58f 46static const char *user_path;
603968d2 47
960deccb 48/* Timeout, and initial timeout */
96f1e58f
DR
49static unsigned int timeout;
50static unsigned int init_timeout;
f8ff0c06 51
01cec54e
RS
52struct hostinfo {
53 struct strbuf hostname;
54 struct strbuf canon_hostname;
55 struct strbuf ip_address;
56 struct strbuf tcp_port;
57 unsigned int hostname_lookup_done:1;
58 unsigned int saw_extended_args:1;
59};
edef953e 60
01cec54e 61static void lookup_hostname(struct hostinfo *hi);
edef953e 62
01cec54e 63static const char *get_canon_hostname(struct hostinfo *hi)
edef953e 64{
01cec54e
RS
65 lookup_hostname(hi);
66 return hi->canon_hostname.buf;
edef953e
RS
67}
68
01cec54e 69static const char *get_ip_address(struct hostinfo *hi)
edef953e 70{
01cec54e
RS
71 lookup_hostname(hi);
72 return hi->ip_address.buf;
edef953e
RS
73}
74
9048fe1c 75static void logreport(int priority, const char *err, va_list params)
f8ff0c06 76{
9048fe1c 77 if (log_syslog) {
6a992e9e
SB
78 char buf[1024];
79 vsnprintf(buf, sizeof(buf), err, params);
9048fe1c 80 syslog(priority, "%s", buf);
460c2010
JH
81 } else {
82 /*
48cfaea1 83 * Since stderr is set to buffered mode, the
6a992e9e 84 * logging of different processes will not overlap
48cfaea1 85 * unless they overflow the (rather big) buffers.
6a992e9e 86 */
85e72830 87 fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid());
6a992e9e
SB
88 vfprintf(stderr, err, params);
89 fputc('\n', stderr);
48cfaea1 90 fflush(stderr);
6a992e9e 91 }
f8ff0c06
PB
92}
93
28bea9e5 94__attribute__((format (printf, 1, 2)))
cdda4745 95static void logerror(const char *err, ...)
f8ff0c06
PB
96{
97 va_list params;
98 va_start(params, err);
9048fe1c 99 logreport(LOG_ERR, err, params);
f8ff0c06
PB
100 va_end(params);
101}
102
28bea9e5 103__attribute__((format (printf, 1, 2)))
cdda4745 104static void loginfo(const char *err, ...)
f8ff0c06
PB
105{
106 va_list params;
107 if (!verbose)
108 return;
109 va_start(params, err);
9048fe1c 110 logreport(LOG_INFO, err, params);
f8ff0c06
PB
111 va_end(params);
112}
a87e8be2 113
ad8b4f56
ML
114static void NORETURN daemon_die(const char *err, va_list params)
115{
116 logreport(LOG_ERR, err, params);
117 exit(1);
118}
119
dc8edc8f
RS
120struct expand_path_context {
121 const char *directory;
01cec54e 122 struct hostinfo *hostinfo;
dc8edc8f
RS
123};
124
125static size_t expand_path(struct strbuf *sb, const char *placeholder, void *ctx)
126{
127 struct expand_path_context *context = ctx;
01cec54e 128 struct hostinfo *hi = context->hostinfo;
dc8edc8f
RS
129
130 switch (placeholder[0]) {
131 case 'H':
01cec54e 132 strbuf_addbuf(sb, &hi->hostname);
dc8edc8f
RS
133 return 1;
134 case 'C':
135 if (placeholder[1] == 'H') {
01cec54e 136 strbuf_addstr(sb, get_canon_hostname(hi));
dc8edc8f
RS
137 return 2;
138 }
139 break;
140 case 'I':
141 if (placeholder[1] == 'P') {
01cec54e 142 strbuf_addstr(sb, get_ip_address(hi));
dc8edc8f
RS
143 return 2;
144 }
145 break;
146 case 'P':
01cec54e 147 strbuf_addbuf(sb, &hi->tcp_port);
dc8edc8f
RS
148 return 1;
149 case 'D':
150 strbuf_addstr(sb, context->directory);
151 return 1;
152 }
153 return 0;
154}
155
01cec54e 156static const char *path_ok(const char *directory, struct hostinfo *hi)
4ae95682 157{
603968d2 158 static char rpath[PATH_MAX];
49ba83fb 159 static char interp_path[PATH_MAX];
6bdb0083 160 size_t rlen;
1c64b48e 161 const char *path;
1055a890 162 const char *dir;
49ba83fb 163
9d7ca667 164 dir = directory;
d79374c7 165
34b6cb8b 166 if (daemon_avoid_alias(dir)) {
d79374c7
JH
167 logerror("'%s': aliased", dir);
168 return NULL;
169 }
170
603968d2
JH
171 if (*dir == '~') {
172 if (!user_path) {
173 logerror("'%s': User-path not allowed", dir);
174 return NULL;
175 }
176 if (*user_path) {
177 /* Got either "~alice" or "~alice/foo";
178 * rewrite them to "~alice/%s" or
179 * "~alice/%s/foo".
180 */
181 int namlen, restlen = strlen(dir);
1055a890 182 const char *slash = strchr(dir, '/');
603968d2
JH
183 if (!slash)
184 slash = dir + restlen;
185 namlen = slash - dir;
186 restlen -= namlen;
187 loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
6bdb0083
JK
188 rlen = snprintf(rpath, sizeof(rpath), "%.*s/%s%.*s",
189 namlen, dir, user_path, restlen, slash);
190 if (rlen >= sizeof(rpath)) {
191 logerror("user-path too large: %s", rpath);
192 return NULL;
193 }
603968d2
JH
194 dir = rpath;
195 }
196 }
01cec54e 197 else if (interpolated_path && hi->saw_extended_args) {
9d7ca667 198 struct strbuf expanded_path = STRBUF_INIT;
dc8edc8f
RS
199 struct expand_path_context context;
200
201 context.directory = directory;
01cec54e 202 context.hostinfo = hi;
dc8edc8f 203
49ba83fb
JL
204 if (*dir != '/') {
205 /* Allow only absolute */
206 logerror("'%s': Non-absolute path denied (interpolated-path active)", dir);
207 return NULL;
208 }
209
9d7ca667 210 strbuf_expand(&expanded_path, interpolated_path,
dc8edc8f 211 expand_path, &context);
6bdb0083
JK
212
213 rlen = strlcpy(interp_path, expanded_path.buf,
214 sizeof(interp_path));
215 if (rlen >= sizeof(interp_path)) {
216 logerror("interpolated path too large: %s",
217 interp_path);
218 return NULL;
219 }
220
9d7ca667 221 strbuf_release(&expanded_path);
49ba83fb
JL
222 loginfo("Interpolated dir '%s'", interp_path);
223
224 dir = interp_path;
225 }
603968d2
JH
226 else if (base_path) {
227 if (*dir != '/') {
228 /* Allow only absolute */
1fda3d55 229 logerror("'%s': Non-absolute path denied (base-path active)", dir);
b21c31c9
PB
230 return NULL;
231 }
6bdb0083
JK
232 rlen = snprintf(rpath, sizeof(rpath), "%s%s", base_path, dir);
233 if (rlen >= sizeof(rpath)) {
234 logerror("base-path too large: %s", rpath);
235 return NULL;
236 }
49ba83fb 237 dir = rpath;
b21c31c9
PB
238 }
239
a583971f
RS
240 path = enter_repo(dir, strict_paths);
241 if (!path && base_path && base_path_relaxed) {
73a7a656
JA
242 /*
243 * if we fail and base_path_relaxed is enabled, try without
244 * prefixing the base path
245 */
a583971f
RS
246 dir = directory;
247 path = enter_repo(dir, strict_paths);
248 }
3e04c62d 249
4dbd1352 250 if (!path) {
05ac6b34 251 logerror("'%s' does not appear to be a git repository", dir);
4dbd1352 252 return NULL;
4ae95682
PA
253 }
254
255 if ( ok_paths && *ok_paths ) {
3f2e2297 256 const char **pp;
4dbd1352 257 int pathlen = strlen(path);
4ae95682 258
ce335fe0 259 /* The validation is done on the paths after enter_repo
a6080a0a 260 * appends optional {.git,.git/.git} and friends, but
d79374c7
JH
261 * it does not use getcwd(). So if your /pub is
262 * a symlink to /mnt/pub, you can whitelist /pub and
263 * do not have to say /mnt/pub.
264 * Do not say /pub/.
ce335fe0 265 */
4ae95682
PA
266 for ( pp = ok_paths ; *pp ; pp++ ) {
267 int len = strlen(*pp);
ce335fe0
JH
268 if (len <= pathlen &&
269 !memcmp(*pp, path, len) &&
270 (path[len] == '\0' ||
271 (!strict_paths && path[len] == '/')))
272 return path;
4ae95682 273 }
4dbd1352
AE
274 }
275 else {
276 /* be backwards compatible */
277 if (!strict_paths)
278 return path;
4ae95682
PA
279 }
280
4dbd1352
AE
281 logerror("'%s': not in whitelist", path);
282 return NULL; /* Fallthrough. Deny by default */
4ae95682 283}
a87e8be2 284
d819e4e6
JH
285typedef int (*daemon_service_fn)(void);
286struct daemon_service {
287 const char *name;
288 const char *config_name;
289 daemon_service_fn fn;
290 int enabled;
291 int overridable;
292};
293
d5570f4d
JK
294static int daemon_error(const char *dir, const char *msg)
295{
296 if (!informative_errors)
297 msg = "access denied or repository not exported";
81c634e9 298 packet_write_fmt(1, "ERR %s: %s", msg, dir);
d5570f4d
JK
299 return -1;
300}
301
1055a890 302static const char *access_hook;
93741e4a 303
01cec54e
RS
304static int run_access_hook(struct daemon_service *service, const char *dir,
305 const char *path, struct hostinfo *hi)
93741e4a 306{
d3180279 307 struct child_process child = CHILD_PROCESS_INIT;
93741e4a
JH
308 struct strbuf buf = STRBUF_INIT;
309 const char *argv[8];
310 const char **arg = argv;
311 char *eol;
312 int seen_errors = 0;
313
93741e4a
JH
314 *arg++ = access_hook;
315 *arg++ = service->name;
316 *arg++ = path;
01cec54e
RS
317 *arg++ = hi->hostname.buf;
318 *arg++ = get_canon_hostname(hi);
319 *arg++ = get_ip_address(hi);
320 *arg++ = hi->tcp_port.buf;
93741e4a 321 *arg = NULL;
93741e4a 322
93741e4a
JH
323 child.use_shell = 1;
324 child.argv = argv;
325 child.no_stdin = 1;
326 child.no_stderr = 1;
327 child.out = -1;
328 if (start_command(&child)) {
329 logerror("daemon access hook '%s' failed to start",
330 access_hook);
331 goto error_return;
332 }
333 if (strbuf_read(&buf, child.out, 0) < 0) {
334 logerror("failed to read from pipe to daemon access hook '%s'",
335 access_hook);
336 strbuf_reset(&buf);
337 seen_errors = 1;
338 }
339 if (close(child.out) < 0) {
340 logerror("failed to close pipe to daemon access hook '%s'",
341 access_hook);
342 seen_errors = 1;
343 }
344 if (finish_command(&child))
345 seen_errors = 1;
346
347 if (!seen_errors) {
348 strbuf_release(&buf);
349 return 0;
350 }
351
352error_return:
353 strbuf_ltrim(&buf);
354 if (!buf.len)
355 strbuf_addstr(&buf, "service rejected");
356 eol = strchr(buf.buf, '\n');
357 if (eol)
358 *eol = '\0';
359 errno = EACCES;
360 daemon_error(dir, buf.buf);
361 strbuf_release(&buf);
362 return -1;
363}
364
01cec54e
RS
365static int run_service(const char *dir, struct daemon_service *service,
366 struct hostinfo *hi)
a87e8be2 367{
4dbd1352 368 const char *path;
d819e4e6 369 int enabled = service->enabled;
8939d32d 370 struct strbuf var = STRBUF_INIT;
d819e4e6 371
a47551c3 372 loginfo("Request %s for '%s'", service->name, dir);
4dbd1352 373
d819e4e6
JH
374 if (!enabled && !service->overridable) {
375 logerror("'%s': service not enabled.", service->name);
376 errno = EACCES;
d5570f4d 377 return daemon_error(dir, "service not enabled");
d819e4e6 378 }
4ae95682 379
01cec54e 380 if (!(path = path_ok(dir, hi)))
d5570f4d 381 return daemon_error(dir, "no such repository");
47888f0f 382
a87e8be2
LT
383 /*
384 * Security on the cheap.
385 *
a935c397 386 * We want a readable HEAD, usable "objects" directory, and
a87e8be2
LT
387 * a "git-daemon-export-ok" flag that says that the other side
388 * is ok with us doing this.
4dbd1352
AE
389 *
390 * path_ok() uses enter_repo() and does whitelist checking.
391 * We only need to make sure the repository is exported.
a87e8be2 392 */
4dbd1352 393
3e04c62d 394 if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
4dbd1352 395 logerror("'%s': repository not exported.", path);
3e04c62d 396 errno = EACCES;
d5570f4d 397 return daemon_error(dir, "repository not exported");
3e04c62d
PA
398 }
399
d819e4e6 400 if (service->overridable) {
8939d32d
TA
401 strbuf_addf(&var, "daemon.%s", service->config_name);
402 git_config_get_bool(var.buf, &enabled);
403 strbuf_release(&var);
d819e4e6
JH
404 }
405 if (!enabled) {
406 logerror("'%s': service not enabled for '%s'",
407 service->name, path);
408 errno = EACCES;
d5570f4d 409 return daemon_error(dir, "service not enabled");
d819e4e6
JH
410 }
411
93741e4a
JH
412 /*
413 * Optionally, a hook can choose to deny access to the
414 * repository depending on the phase of the moon.
415 */
01cec54e 416 if (access_hook && run_access_hook(service, dir, path, hi))
93741e4a
JH
417 return -1;
418
02d57da4
LT
419 /*
420 * We'll ignore SIGTERM from now on, we have a
421 * good client.
422 */
423 signal(SIGTERM, SIG_IGN);
424
d819e4e6
JH
425 return service->fn();
426}
427
5d87dd4f
JS
428static void copy_to_log(int fd)
429{
430 struct strbuf line = STRBUF_INIT;
431 FILE *fp;
432
433 fp = fdopen(fd, "r");
434 if (fp == NULL) {
435 logerror("fdopen of error channel failed");
436 close(fd);
437 return;
438 }
439
8f309aeb 440 while (strbuf_getline_lf(&line, fp) != EOF) {
5d87dd4f
JS
441 logerror("%s", line.buf);
442 strbuf_setlen(&line, 0);
443 }
444
445 strbuf_release(&line);
446 fclose(fp);
447}
448
6a97da39 449static int run_service_command(struct child_process *cld)
5d87dd4f 450{
6a97da39
JK
451 argv_array_push(&cld->args, ".");
452 cld->git_cmd = 1;
453 cld->err = -1;
454 if (start_command(cld))
5d87dd4f
JS
455 return -1;
456
457 close(0);
458 close(1);
459
6a97da39 460 copy_to_log(cld->err);
5d87dd4f 461
6a97da39 462 return finish_command(cld);
5d87dd4f
JS
463}
464
d819e4e6
JH
465static int upload_pack(void)
466{
6a97da39
JK
467 struct child_process cld = CHILD_PROCESS_INIT;
468 argv_array_pushl(&cld.args, "upload-pack", "--strict", NULL);
469 argv_array_pushf(&cld.args, "--timeout=%u", timeout);
470 return run_service_command(&cld);
a87e8be2
LT
471}
472
39345a21
FBH
473static int upload_archive(void)
474{
6a97da39
JK
475 struct child_process cld = CHILD_PROCESS_INIT;
476 argv_array_push(&cld.args, "upload-archive");
477 return run_service_command(&cld);
39345a21
FBH
478}
479
4b3b1e1e
LT
480static int receive_pack(void)
481{
6a97da39
JK
482 struct child_process cld = CHILD_PROCESS_INIT;
483 argv_array_push(&cld.args, "receive-pack");
484 return run_service_command(&cld);
4b3b1e1e
LT
485}
486
d819e4e6 487static struct daemon_service daemon_service[] = {
39345a21 488 { "upload-archive", "uploadarch", upload_archive, 0, 1 },
d819e4e6 489 { "upload-pack", "uploadpack", upload_pack, 1, 1 },
4b3b1e1e 490 { "receive-pack", "receivepack", receive_pack, 0, 1 },
d819e4e6
JH
491};
492
f3fa1838
JH
493static void enable_service(const char *name, int ena)
494{
d819e4e6
JH
495 int i;
496 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
497 if (!strcmp(daemon_service[i].name, name)) {
498 daemon_service[i].enabled = ena;
499 return;
500 }
501 }
502 die("No such service %s", name);
503}
504
f3fa1838
JH
505static void make_service_overridable(const char *name, int ena)
506{
d819e4e6
JH
507 int i;
508 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
509 if (!strcmp(daemon_service[i].name, name)) {
510 daemon_service[i].overridable = ena;
511 return;
512 }
513 }
514 die("No such service %s", name);
515}
516
e8dbd76d
IL
517static void parse_host_and_port(char *hostport, char **host,
518 char **port)
519{
520 if (*hostport == '[') {
521 char *end;
522
523 end = strchr(hostport, ']');
524 if (!end)
9517e6b8 525 die("Invalid request ('[' without ']')");
e8dbd76d
IL
526 *end = '\0';
527 *host = hostport + 1;
528 if (!end[1])
529 *port = NULL;
530 else if (end[1] == ':')
531 *port = end + 2;
532 else
533 die("Garbage after end of host part");
534 } else {
535 *host = hostport;
536 *port = strrchr(hostport, ':');
537 if (*port) {
e9bd3235 538 **port = '\0';
e8dbd76d
IL
539 ++*port;
540 }
541 }
542}
543
b4853730
JK
544/*
545 * Sanitize a string from the client so that it's OK to be inserted into a
546 * filesystem path. Specifically, we disallow slashes, runs of "..", and
547 * trailing and leading dots, which means that the client cannot escape
548 * our base path via ".." traversal.
549 */
7a646cec 550static void sanitize_client(struct strbuf *out, const char *in)
b4853730
JK
551{
552 for (; *in; in++) {
553 if (*in == '/')
554 continue;
555 if (*in == '.' && (!out->len || out->buf[out->len - 1] == '.'))
556 continue;
557 strbuf_addch(out, *in);
558 }
559
560 while (out->len && out->buf[out->len - 1] == '.')
561 strbuf_setlen(out, out->len - 1);
562}
563
b4853730
JK
564/*
565 * Like sanitize_client, but we also perform any canonicalization
566 * to make life easier on the admin.
567 */
7a646cec 568static void canonicalize_client(struct strbuf *out, const char *in)
b4853730 569{
7a646cec
RS
570 sanitize_client(out, in);
571 strbuf_tolower(out);
b4853730
JK
572}
573
eb30aed7 574/*
73bb33a9 575 * Read the host as supplied by the client connection.
eb30aed7 576 */
01cec54e 577static void parse_host_arg(struct hostinfo *hi, char *extra_args, int buflen)
49ba83fb
JL
578{
579 char *val;
580 int vallen;
581 char *end = extra_args + buflen;
582
73bb33a9 583 if (extra_args < end && *extra_args) {
01cec54e 584 hi->saw_extended_args = 1;
49ba83fb
JL
585 if (strncasecmp("host=", extra_args, 5) == 0) {
586 val = extra_args + 5;
587 vallen = strlen(val) + 1;
588 if (*val) {
eb30aed7 589 /* Split <host>:<port> at colon. */
e8dbd76d
IL
590 char *host;
591 char *port;
592 parse_host_and_port(val, &host, &port);
01cec54e
RS
593 if (port)
594 sanitize_client(&hi->tcp_port, port);
595 canonicalize_client(&hi->hostname, host);
596 hi->hostname_lookup_done = 0;
49ba83fb 597 }
eb30aed7 598
49ba83fb
JL
599 /* On to the next one */
600 extra_args = val + vallen;
601 }
73bb33a9
SP
602 if (extra_args < end && *extra_args)
603 die("Invalid request");
49ba83fb 604 }
edef953e 605}
dd467629 606
edef953e
RS
607/*
608 * Locate canonical hostname and its IP address.
609 */
01cec54e 610static void lookup_hostname(struct hostinfo *hi)
edef953e 611{
01cec54e 612 if (!hi->hostname_lookup_done && hi->hostname.len) {
dd467629 613#ifndef NO_IPV6
dd467629 614 struct addrinfo hints;
3e8a00ae 615 struct addrinfo *ai;
dd467629
JL
616 int gai;
617 static char addrbuf[HOST_NAME_MAX + 1];
618
619 memset(&hints, 0, sizeof(hints));
620 hints.ai_flags = AI_CANONNAME;
621
01cec54e 622 gai = getaddrinfo(hi->hostname.buf, NULL, &hints, &ai);
dd467629 623 if (!gai) {
3e8a00ae
BK
624 struct sockaddr_in *sin_addr = (void *)ai->ai_addr;
625
626 inet_ntop(AF_INET, &sin_addr->sin_addr,
627 addrbuf, sizeof(addrbuf));
01cec54e 628 strbuf_addstr(&hi->ip_address, addrbuf);
3e8a00ae 629
7a646cec 630 if (ai->ai_canonname)
01cec54e 631 sanitize_client(&hi->canon_hostname,
7a646cec
RS
632 ai->ai_canonname);
633 else
01cec54e
RS
634 strbuf_addbuf(&hi->canon_hostname,
635 &hi->ip_address);
3e8a00ae
BK
636
637 freeaddrinfo(ai);
dd467629 638 }
dd467629 639#else
dd467629
JL
640 struct hostent *hent;
641 struct sockaddr_in sa;
642 char **ap;
643 static char addrbuf[HOST_NAME_MAX + 1];
644
d358f771 645 hent = gethostbyname(hi->hostname.buf);
eb6c4035
RS
646 if (hent) {
647 ap = hent->h_addr_list;
648 memset(&sa, 0, sizeof sa);
649 sa.sin_family = hent->h_addrtype;
650 sa.sin_port = htons(0);
651 memcpy(&sa.sin_addr, *ap, hent->h_length);
652
653 inet_ntop(hent->h_addrtype, &sa.sin_addr,
654 addrbuf, sizeof(addrbuf));
dd467629 655
01cec54e
RS
656 sanitize_client(&hi->canon_hostname, hent->h_name);
657 strbuf_addstr(&hi->ip_address, addrbuf);
eb6c4035 658 }
dd467629 659#endif
01cec54e 660 hi->hostname_lookup_done = 1;
6720e95b 661 }
dd467629
JL
662}
663
01cec54e
RS
664static void hostinfo_init(struct hostinfo *hi)
665{
666 memset(hi, 0, sizeof(*hi));
667 strbuf_init(&hi->hostname, 0);
668 strbuf_init(&hi->canon_hostname, 0);
669 strbuf_init(&hi->ip_address, 0);
670 strbuf_init(&hi->tcp_port, 0);
671}
672
673static void hostinfo_clear(struct hostinfo *hi)
674{
675 strbuf_release(&hi->hostname);
676 strbuf_release(&hi->canon_hostname);
677 strbuf_release(&hi->ip_address);
678 strbuf_release(&hi->tcp_port);
679}
dd467629 680
a43b68a1
EW
681static void set_keep_alive(int sockfd)
682{
683 int ka = 1;
684
49c58d86
EW
685 if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0) {
686 if (errno != ENOTSOCK)
687 logerror("unable to set SO_KEEPALIVE on socket: %s",
688 strerror(errno));
689 }
a43b68a1
EW
690}
691
f9c87be6 692static int execute(void)
a87e8be2 693{
74543a04 694 char *line = packet_buffer;
d819e4e6 695 int pktlen, len, i;
f9c87be6 696 char *addr = getenv("REMOTE_ADDR"), *port = getenv("REMOTE_PORT");
01cec54e
RS
697 struct hostinfo hi;
698
699 hostinfo_init(&hi);
7d80694a 700
f9c87be6
EFL
701 if (addr)
702 loginfo("Connection from %s:%s", addr, port);
5b276ee4 703
a43b68a1 704 set_keep_alive(0);
960deccb 705 alarm(init_timeout ? init_timeout : timeout);
4981fe75 706 pktlen = packet_read(0, NULL, NULL, packet_buffer, sizeof(packet_buffer), 0);
960deccb 707 alarm(0);
7d80694a 708
5ad312be
JL
709 len = strlen(line);
710 if (pktlen != len)
711 loginfo("Extended attributes (%d bytes) exist <%.*s>",
712 (int) pktlen - len,
713 (int) pktlen - len, line + len + 1);
83543a24 714 if (len && line[len-1] == '\n') {
7d80694a 715 line[--len] = 0;
83543a24
JH
716 pktlen--;
717 }
7d80694a 718
d433ed0b 719 if (len != pktlen)
01cec54e 720 parse_host_arg(&hi, line + len + 1, pktlen - len - 1);
49ba83fb 721
d819e4e6
JH
722 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
723 struct daemon_service *s = &(daemon_service[i]);
d12c24d2
JK
724 const char *arg;
725
726 if (skip_prefix(line, "git-", &arg) &&
727 skip_prefix(arg, s->name, &arg) &&
728 *arg++ == ' ') {
eb30aed7
JL
729 /*
730 * Note: The directory here is probably context sensitive,
731 * and might depend on the actual service being performed.
732 */
01cec54e
RS
733 int rc = run_service(arg, s, &hi);
734 hostinfo_clear(&hi);
735 return rc;
49ba83fb 736 }
d819e4e6 737 }
a87e8be2 738
01cec54e 739 hostinfo_clear(&hi);
f8ff0c06 740 logerror("Protocol error: '%s'", line);
a87e8be2
LT
741 return -1;
742}
743
15515b73
EFL
744static int addrcmp(const struct sockaddr_storage *s1,
745 const struct sockaddr_storage *s2)
746{
3aff874a
BC
747 const struct sockaddr *sa1 = (const struct sockaddr*) s1;
748 const struct sockaddr *sa2 = (const struct sockaddr*) s2;
749
750 if (sa1->sa_family != sa2->sa_family)
751 return sa1->sa_family - sa2->sa_family;
752 if (sa1->sa_family == AF_INET)
15515b73
EFL
753 return memcmp(&((struct sockaddr_in *)s1)->sin_addr,
754 &((struct sockaddr_in *)s2)->sin_addr,
755 sizeof(struct in_addr));
756#ifndef NO_IPV6
3aff874a 757 if (sa1->sa_family == AF_INET6)
15515b73
EFL
758 return memcmp(&((struct sockaddr_in6 *)s1)->sin6_addr,
759 &((struct sockaddr_in6 *)s2)->sin6_addr,
760 sizeof(struct in6_addr));
761#endif
762 return 0;
763}
764
3bd62c21 765static int max_connections = 32;
66e631de 766
3bd62c21 767static unsigned int live_children;
66e631de 768
4d8fa916 769static struct child {
3bd62c21 770 struct child *next;
30e15602 771 struct child_process cld;
df076bdb 772 struct sockaddr_storage address;
3bd62c21 773} *firstborn;
66e631de 774
c295cf06 775static void add_child(struct child_process *cld, struct sockaddr *addr, socklen_t addrlen)
66e631de 776{
460c2010
JH
777 struct child *newborn, **cradle;
778
460c2010
JH
779 newborn = xcalloc(1, sizeof(*newborn));
780 live_children++;
30e15602 781 memcpy(&newborn->cld, cld, sizeof(*cld));
460c2010
JH
782 memcpy(&newborn->address, addr, addrlen);
783 for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next)
15515b73 784 if (!addrcmp(&(*cradle)->address, &newborn->address))
460c2010
JH
785 break;
786 newborn->next = *cradle;
787 *cradle = newborn;
66e631de
LT
788}
789
66e631de
LT
790/*
791 * This gets called if the number of connections grows
792 * past "max_connections".
793 *
3bd62c21 794 * We kill the newest connection from a duplicate IP.
66e631de 795 */
3bd62c21 796static void kill_some_child(void)
66e631de 797{
460c2010 798 const struct child *blanket, *next;
66e631de 799
460c2010
JH
800 if (!(blanket = firstborn))
801 return;
695605b5 802
460c2010 803 for (; (next = blanket->next); blanket = next)
15515b73 804 if (!addrcmp(&blanket->address, &next->address)) {
30e15602 805 kill(blanket->cld.pid, SIGTERM);
460c2010
JH
806 break;
807 }
a5a9126b
JS
808}
809
3bd62c21 810static void check_dead_children(void)
a87e8be2 811{
3bd62c21
SB
812 int status;
813 pid_t pid;
02d57da4 814
30e15602
EFL
815 struct child **cradle, *blanket;
816 for (cradle = &firstborn; (blanket = *cradle);)
817 if ((pid = waitpid(blanket->cld.pid, &status, WNOHANG)) > 1) {
818 const char *dead = "";
819 if (status)
820 dead = " (with error)";
821 loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead);
822
823 /* remove the child */
824 *cradle = blanket->next;
825 live_children--;
b1b49ff8 826 child_process_clear(&blanket->cld);
30e15602
EFL
827 free(blanket);
828 } else
829 cradle = &blanket->next;
02d57da4
LT
830}
831
850d2fec 832static struct argv_array cld_argv = ARGV_ARRAY_INIT;
c295cf06 833static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen)
02d57da4 834{
d3180279 835 struct child_process cld = CHILD_PROCESS_INIT;
02d57da4 836
3bd62c21
SB
837 if (max_connections && live_children >= max_connections) {
838 kill_some_child();
460c2010 839 sleep(1); /* give it some time to die */
3bd62c21
SB
840 check_dead_children();
841 if (live_children >= max_connections) {
842 close(incoming);
843 logerror("Too many children, dropping connection");
844 return;
845 }
846 }
02d57da4 847
f9c87be6 848 if (addr->sa_family == AF_INET) {
f063d38b 849 char buf[128] = "";
f9c87be6 850 struct sockaddr_in *sin_addr = (void *) addr;
f063d38b
JK
851 inet_ntop(addr->sa_family, &sin_addr->sin_addr, buf, sizeof(buf));
852 argv_array_pushf(&cld.env_array, "REMOTE_ADDR=%s", buf);
853 argv_array_pushf(&cld.env_array, "REMOTE_PORT=%d",
854 ntohs(sin_addr->sin_port));
f9c87be6 855#ifndef NO_IPV6
5d9cfa29 856 } else if (addr->sa_family == AF_INET6) {
f063d38b 857 char buf[128] = "";
f9c87be6 858 struct sockaddr_in6 *sin6_addr = (void *) addr;
f063d38b
JK
859 inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(buf));
860 argv_array_pushf(&cld.env_array, "REMOTE_ADDR=[%s]", buf);
861 argv_array_pushf(&cld.env_array, "REMOTE_PORT=%d",
862 ntohs(sin6_addr->sin6_port));
f9c87be6
EFL
863#endif
864 }
865
850d2fec 866 cld.argv = cld_argv.argv;
30e15602
EFL
867 cld.in = incoming;
868 cld.out = dup(incoming);
a87e8be2 869
30e15602
EFL
870 if (start_command(&cld))
871 logerror("unable to fork");
872 else
873 add_child(&cld, addr, addrlen);
a87e8be2
LT
874}
875
eaa94919
LT
876static void child_handler(int signo)
877{
460c2010
JH
878 /*
879 * Otherwise empty handler because systemcalls will get interrupted
695605b5
SB
880 * upon signal receipt
881 * SysV needs the handler to be rearmed
882 */
bd7b371e 883 signal(SIGCHLD, child_handler);
eaa94919
LT
884}
885
1955fabf
MW
886static int set_reuse_addr(int sockfd)
887{
888 int on = 1;
889
890 if (!reuseaddr)
891 return 0;
892 return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
893 &on, sizeof(on));
894}
895
2caa3215
AS
896struct socketlist {
897 int *list;
898 size_t nr;
899 size_t alloc;
900};
901
089d82e8
NTND
902static const char *ip2str(int family, struct sockaddr *sin, socklen_t len)
903{
904#ifdef NO_IPV6
905 static char ip[INET_ADDRSTRLEN];
906#else
907 static char ip[INET6_ADDRSTRLEN];
908#endif
909
910 switch (family) {
911#ifndef NO_IPV6
912 case AF_INET6:
913 inet_ntop(family, &((struct sockaddr_in6*)sin)->sin6_addr, ip, len);
914 break;
915#endif
916 case AF_INET:
917 inet_ntop(family, &((struct sockaddr_in*)sin)->sin_addr, ip, len);
918 break;
919 default:
5096d490 920 xsnprintf(ip, sizeof(ip), "<unknown>");
089d82e8
NTND
921 }
922 return ip;
923}
924
6573faff
PA
925#ifndef NO_IPV6
926
2caa3215 927static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
a87e8be2 928{
2caa3215 929 int socknum = 0;
df076bdb 930 char pbuf[NI_MAXSERV];
6573faff
PA
931 struct addrinfo hints, *ai0, *ai;
932 int gai;
20276889 933 long flags;
df076bdb 934
5096d490 935 xsnprintf(pbuf, sizeof(pbuf), "%d", listen_port);
df076bdb
YH
936 memset(&hints, 0, sizeof(hints));
937 hints.ai_family = AF_UNSPEC;
938 hints.ai_socktype = SOCK_STREAM;
939 hints.ai_protocol = IPPROTO_TCP;
940 hints.ai_flags = AI_PASSIVE;
941
dd467629 942 gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0);
2caa3215
AS
943 if (gai) {
944 logerror("getaddrinfo() for %s failed: %s", listen_addr, gai_strerror(gai));
945 return 0;
946 }
df076bdb 947
df076bdb
YH
948 for (ai = ai0; ai; ai = ai->ai_next) {
949 int sockfd;
df076bdb
YH
950
951 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
952 if (sockfd < 0)
953 continue;
954 if (sockfd >= FD_SETSIZE) {
df0daf8a 955 logerror("Socket descriptor too large");
df076bdb
YH
956 close(sockfd);
957 continue;
958 }
959
960#ifdef IPV6_V6ONLY
961 if (ai->ai_family == AF_INET6) {
962 int on = 1;
963 setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
964 &on, sizeof(on));
965 /* Note: error is not fatal */
966 }
967#endif
968
1955fabf 969 if (set_reuse_addr(sockfd)) {
089d82e8 970 logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
1955fabf 971 close(sockfd);
0032d548 972 continue;
1955fabf
MW
973 }
974
a43b68a1
EW
975 set_keep_alive(sockfd);
976
df076bdb 977 if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
089d82e8
NTND
978 logerror("Could not bind to %s: %s",
979 ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
980 strerror(errno));
df076bdb
YH
981 close(sockfd);
982 continue; /* not fatal */
983 }
984 if (listen(sockfd, 5) < 0) {
089d82e8
NTND
985 logerror("Could not listen to %s: %s",
986 ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
987 strerror(errno));
df076bdb
YH
988 close(sockfd);
989 continue; /* not fatal */
990 }
991
20276889
AJ
992 flags = fcntl(sockfd, F_GETFD, 0);
993 if (flags >= 0)
994 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
995
2caa3215
AS
996 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
997 socklist->list[socklist->nr++] = sockfd;
998 socknum++;
df076bdb
YH
999 }
1000
1001 freeaddrinfo(ai0);
1002
6573faff
PA
1003 return socknum;
1004}
1005
1006#else /* NO_IPV6 */
1007
2caa3215 1008static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
6573faff
PA
1009{
1010 struct sockaddr_in sin;
1011 int sockfd;
20276889 1012 long flags;
6573faff 1013
dd467629
JL
1014 memset(&sin, 0, sizeof sin);
1015 sin.sin_family = AF_INET;
1016 sin.sin_port = htons(listen_port);
1017
1018 if (listen_addr) {
1019 /* Well, host better be an IP address here. */
1020 if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0)
1021 return 0;
1022 } else {
1023 sin.sin_addr.s_addr = htonl(INADDR_ANY);
1024 }
1025
6573faff
PA
1026 sockfd = socket(AF_INET, SOCK_STREAM, 0);
1027 if (sockfd < 0)
1028 return 0;
1029
1955fabf 1030 if (set_reuse_addr(sockfd)) {
089d82e8 1031 logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
1955fabf
MW
1032 close(sockfd);
1033 return 0;
1034 }
1035
a43b68a1
EW
1036 set_keep_alive(sockfd);
1037
6573faff 1038 if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
9d1b9aa9 1039 logerror("Could not bind to %s: %s",
089d82e8
NTND
1040 ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
1041 strerror(errno));
6573faff
PA
1042 close(sockfd);
1043 return 0;
1044 }
a87e8be2 1045
f35230fb 1046 if (listen(sockfd, 5) < 0) {
089d82e8
NTND
1047 logerror("Could not listen to %s: %s",
1048 ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
1049 strerror(errno));
f35230fb
PS
1050 close(sockfd);
1051 return 0;
1052 }
1053
20276889
AJ
1054 flags = fcntl(sockfd, F_GETFD, 0);
1055 if (flags >= 0)
1056 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
1057
2caa3215
AS
1058 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
1059 socklist->list[socklist->nr++] = sockfd;
f35230fb 1060 return 1;
6573faff
PA
1061}
1062
1063#endif
1064
3a3a29c1 1065static void socksetup(struct string_list *listen_addr, int listen_port, struct socketlist *socklist)
2caa3215 1066{
3a3a29c1
AS
1067 if (!listen_addr->nr)
1068 setup_named_sock(NULL, listen_port, socklist);
1069 else {
1070 int i, socknum;
1071 for (i = 0; i < listen_addr->nr; i++) {
1072 socknum = setup_named_sock(listen_addr->items[i].string,
1073 listen_port, socklist);
1074
1075 if (socknum == 0)
1076 logerror("unable to allocate any listen sockets for host %s on port %u",
1077 listen_addr->items[i].string, listen_port);
1078 }
1079 }
2caa3215
AS
1080}
1081
1082static int service_loop(struct socketlist *socklist)
6573faff
PA
1083{
1084 struct pollfd *pfd;
1085 int i;
1086
2caa3215 1087 pfd = xcalloc(socklist->nr, sizeof(struct pollfd));
6573faff 1088
2caa3215
AS
1089 for (i = 0; i < socklist->nr; i++) {
1090 pfd[i].fd = socklist->list[i];
6573faff
PA
1091 pfd[i].events = POLLIN;
1092 }
9220282a
PA
1093
1094 signal(SIGCHLD, child_handler);
a87e8be2
LT
1095
1096 for (;;) {
df076bdb 1097 int i;
6573faff 1098
695605b5
SB
1099 check_dead_children();
1100
2caa3215 1101 if (poll(pfd, socklist->nr, -1) < 0) {
1eef0b33 1102 if (errno != EINTR) {
df0daf8a 1103 logerror("Poll failed, resuming: %s",
1eef0b33
JH
1104 strerror(errno));
1105 sleep(1);
1106 }
df076bdb
YH
1107 continue;
1108 }
1109
2caa3215 1110 for (i = 0; i < socklist->nr; i++) {
6573faff 1111 if (pfd[i].revents & POLLIN) {
f9c87be6
EFL
1112 union {
1113 struct sockaddr sa;
1114 struct sockaddr_in sai;
1115#ifndef NO_IPV6
1116 struct sockaddr_in6 sai6;
1117#endif
1118 } ss;
c295cf06 1119 socklen_t sslen = sizeof(ss);
f9c87be6 1120 int incoming = accept(pfd[i].fd, &ss.sa, &sslen);
df076bdb
YH
1121 if (incoming < 0) {
1122 switch (errno) {
1123 case EAGAIN:
1124 case EINTR:
1125 case ECONNABORTED:
1126 continue;
1127 default:
d824cbba 1128 die_errno("accept returned");
df076bdb
YH
1129 }
1130 }
f9c87be6 1131 handle(incoming, &ss.sa, sslen);
a87e8be2
LT
1132 }
1133 }
a87e8be2
LT
1134 }
1135}
1136
a666b472
EFL
1137#ifdef NO_POSIX_GOODIES
1138
1139struct credentials;
1140
1141static void drop_privileges(struct credentials *cred)
1142{
1143 /* nothing */
1144}
1145
a666b472
EFL
1146static struct credentials *prepare_credentials(const char *user_name,
1147 const char *group_name)
1148{
1149 die("--user not supported on this platform");
1150}
1151
1152#else
1153
1154struct credentials {
1155 struct passwd *pass;
1156 gid_t gid;
1157};
1158
1159static void drop_privileges(struct credentials *cred)
1160{
1161 if (cred && (initgroups(cred->pass->pw_name, cred->gid) ||
1162 setgid (cred->gid) || setuid(cred->pass->pw_uid)))
1163 die("cannot drop privileges");
1164}
1165
1166static struct credentials *prepare_credentials(const char *user_name,
1167 const char *group_name)
1168{
1169 static struct credentials c;
1170
1171 c.pass = getpwnam(user_name);
1172 if (!c.pass)
1173 die("user not found - %s", user_name);
1174
1175 if (!group_name)
1176 c.gid = c.pass->pw_gid;
1177 else {
1178 struct group *group = getgrnam(group_name);
1179 if (!group)
1180 die("group not found - %s", group_name);
1181
1182 c.gid = group->gr_gid;
1183 }
1184
1185 return &c;
1186}
a666b472 1187#endif
a5262768 1188
a666b472
EFL
1189static int serve(struct string_list *listen_addr, int listen_port,
1190 struct credentials *cred)
6573faff 1191{
2caa3215 1192 struct socketlist socklist = { NULL, 0, 0 };
4ae22d96 1193
2caa3215
AS
1194 socksetup(listen_addr, listen_port, &socklist);
1195 if (socklist.nr == 0)
3a3a29c1
AS
1196 die("unable to allocate any listen sockets on port %u",
1197 listen_port);
4ae22d96 1198
a666b472 1199 drop_privileges(cred);
678dac6b 1200
f6a34cfb
CB
1201 loginfo("Ready to rumble");
1202
2caa3215 1203 return service_loop(&socklist);
4ae22d96 1204}
6573faff 1205
3f2e2297 1206int cmd_main(int argc, const char **argv)
a87e8be2 1207{
dd467629 1208 int listen_port = 0;
3a3a29c1 1209 struct string_list listen_addr = STRING_LIST_INIT_NODUP;
30e15602 1210 int serve_mode = 0, inetd_mode = 0;
678dac6b 1211 const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
a5262768 1212 int detach = 0;
a666b472 1213 struct credentials *cred = NULL;
a87e8be2
LT
1214 int i;
1215
1216 for (i = 1; i < argc; i++) {
3f2e2297 1217 const char *arg = argv[i];
ae021d87 1218 const char *v;
a87e8be2 1219
ae021d87
JK
1220 if (skip_prefix(arg, "--listen=", &v)) {
1221 string_list_append(&listen_addr, xstrdup_tolower(v));
6720e95b 1222 continue;
dd467629 1223 }
ae021d87 1224 if (skip_prefix(arg, "--port=", &v)) {
a87e8be2
LT
1225 char *end;
1226 unsigned long n;
ae021d87
JK
1227 n = strtoul(v, &end, 0);
1228 if (*v && !*end) {
dd467629 1229 listen_port = n;
a87e8be2
LT
1230 continue;
1231 }
1232 }
30e15602
EFL
1233 if (!strcmp(arg, "--serve")) {
1234 serve_mode = 1;
1235 continue;
1236 }
e64e1b79
LT
1237 if (!strcmp(arg, "--inetd")) {
1238 inetd_mode = 1;
a8883288 1239 log_syslog = 1;
e64e1b79
LT
1240 continue;
1241 }
f8ff0c06
PB
1242 if (!strcmp(arg, "--verbose")) {
1243 verbose = 1;
1244 continue;
1245 }
9048fe1c
PB
1246 if (!strcmp(arg, "--syslog")) {
1247 log_syslog = 1;
9048fe1c
PB
1248 continue;
1249 }
4ae95682
PA
1250 if (!strcmp(arg, "--export-all")) {
1251 export_all_trees = 1;
1252 continue;
1253 }
ae021d87
JK
1254 if (skip_prefix(arg, "--access-hook=", &v)) {
1255 access_hook = v;
93741e4a
JH
1256 continue;
1257 }
ae021d87
JK
1258 if (skip_prefix(arg, "--timeout=", &v)) {
1259 timeout = atoi(v);
a8883288 1260 continue;
960deccb 1261 }
ae021d87
JK
1262 if (skip_prefix(arg, "--init-timeout=", &v)) {
1263 init_timeout = atoi(v);
a8883288 1264 continue;
960deccb 1265 }
ae021d87
JK
1266 if (skip_prefix(arg, "--max-connections=", &v)) {
1267 max_connections = atoi(v);
3bd62c21
SB
1268 if (max_connections < 0)
1269 max_connections = 0; /* unlimited */
1270 continue;
1271 }
4dbd1352
AE
1272 if (!strcmp(arg, "--strict-paths")) {
1273 strict_paths = 1;
1274 continue;
1275 }
ae021d87
JK
1276 if (skip_prefix(arg, "--base-path=", &v)) {
1277 base_path = v;
b21c31c9
PB
1278 continue;
1279 }
73a7a656
JA
1280 if (!strcmp(arg, "--base-path-relaxed")) {
1281 base_path_relaxed = 1;
1282 continue;
1283 }
ae021d87
JK
1284 if (skip_prefix(arg, "--interpolated-path=", &v)) {
1285 interpolated_path = v;
49ba83fb
JL
1286 continue;
1287 }
1955fabf
MW
1288 if (!strcmp(arg, "--reuseaddr")) {
1289 reuseaddr = 1;
1290 continue;
1291 }
603968d2
JH
1292 if (!strcmp(arg, "--user-path")) {
1293 user_path = "";
1294 continue;
1295 }
ae021d87
JK
1296 if (skip_prefix(arg, "--user-path=", &v)) {
1297 user_path = v;
603968d2
JH
1298 continue;
1299 }
ae021d87
JK
1300 if (skip_prefix(arg, "--pid-file=", &v)) {
1301 pid_file = v;
45ed5d7f
ML
1302 continue;
1303 }
a5262768
ML
1304 if (!strcmp(arg, "--detach")) {
1305 detach = 1;
1306 log_syslog = 1;
1307 continue;
1308 }
ae021d87
JK
1309 if (skip_prefix(arg, "--user=", &v)) {
1310 user_name = v;
678dac6b
TS
1311 continue;
1312 }
ae021d87
JK
1313 if (skip_prefix(arg, "--group=", &v)) {
1314 group_name = v;
678dac6b
TS
1315 continue;
1316 }
ae021d87
JK
1317 if (skip_prefix(arg, "--enable=", &v)) {
1318 enable_service(v, 1);
d819e4e6
JH
1319 continue;
1320 }
ae021d87
JK
1321 if (skip_prefix(arg, "--disable=", &v)) {
1322 enable_service(v, 0);
d819e4e6
JH
1323 continue;
1324 }
ae021d87
JK
1325 if (skip_prefix(arg, "--allow-override=", &v)) {
1326 make_service_overridable(v, 1);
d819e4e6
JH
1327 continue;
1328 }
ae021d87
JK
1329 if (skip_prefix(arg, "--forbid-override=", &v)) {
1330 make_service_overridable(v, 0);
d819e4e6
JH
1331 continue;
1332 }
82246b76 1333 if (!strcmp(arg, "--informative-errors")) {
d5570f4d
JK
1334 informative_errors = 1;
1335 continue;
1336 }
82246b76 1337 if (!strcmp(arg, "--no-informative-errors")) {
d5570f4d
JK
1338 informative_errors = 0;
1339 continue;
1340 }
4ae95682
PA
1341 if (!strcmp(arg, "--")) {
1342 ok_paths = &argv[i+1];
1343 break;
1344 } else if (arg[0] != '-') {
1345 ok_paths = &argv[i];
1346 break;
1347 }
e64e1b79 1348
a87e8be2
LT
1349 usage(daemon_usage);
1350 }
1351
22665bba 1352 if (log_syslog) {
6a992e9e 1353 openlog("git-daemon", LOG_PID, LOG_DAEMON);
22665bba 1354 set_die_routine(daemon_die);
460c2010 1355 } else
48196afd 1356 /* avoid splitting a message in the middle */
48cfaea1 1357 setvbuf(stderr, NULL, _IOFBF, 4096);
22665bba 1358
9cddf56e
EFL
1359 if (inetd_mode && (detach || group_name || user_name))
1360 die("--detach, --user and --group are incompatible with --inetd");
678dac6b 1361
3a3a29c1 1362 if (inetd_mode && (listen_port || (listen_addr.nr > 0)))
dd467629
JL
1363 die("--listen= and --port= are incompatible with --inetd");
1364 else if (listen_port == 0)
1365 listen_port = DEFAULT_GIT_PORT;
1366
678dac6b
TS
1367 if (group_name && !user_name)
1368 die("--group supplied without --user");
1369
a666b472
EFL
1370 if (user_name)
1371 cred = prepare_credentials(user_name, group_name);
678dac6b 1372
ad8b4f56
ML
1373 if (strict_paths && (!ok_paths || !*ok_paths))
1374 die("option --strict-paths requires a whitelist");
1375
90b4a71c
JH
1376 if (base_path && !is_directory(base_path))
1377 die("base-path '%s' does not exist or is not a directory",
1378 base_path);
20632071 1379
7c3693f1 1380 if (inetd_mode) {
30e15602
EFL
1381 if (!freopen("/dev/null", "w", stderr))
1382 die_errno("failed to redirect stderr to /dev/null");
1383 }
1384
f9c87be6
EFL
1385 if (inetd_mode || serve_mode)
1386 return execute();
bce8230d 1387
de0957ce
NTND
1388 if (detach) {
1389 if (daemonize())
1390 die("--detach not supported on this platform");
57f5d52a 1391 }
258e93a1 1392
45ed5d7f 1393 if (pid_file)
1f76a10b 1394 write_file(pid_file, "%"PRIuMAX, (uintmax_t) getpid());
45ed5d7f 1395
30e15602 1396 /* prepare argv for serving-processes */
850d2fec
JK
1397 argv_array_push(&cld_argv, argv[0]); /* git-daemon */
1398 argv_array_push(&cld_argv, "--serve");
081f84ee 1399 for (i = 1; i < argc; ++i)
850d2fec 1400 argv_array_push(&cld_argv, argv[i]);
30e15602 1401
a666b472 1402 return serve(&listen_addr, listen_port, cred);
a87e8be2 1403}