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1 | #include "cache.h" | |
2 | #include "config.h" | |
3 | #include "pkt-line.h" | |
4 | #include "run-command.h" | |
5 | #include "strbuf.h" | |
6 | #include "string-list.h" | |
7 | ||
8 | #ifdef NO_INITGROUPS | |
9 | #define initgroups(x, y) (0) /* nothing */ | |
10 | #endif | |
11 | ||
12 | static int log_syslog; | |
13 | static int verbose; | |
14 | static int reuseaddr; | |
15 | static int informative_errors; | |
16 | ||
17 | static const char daemon_usage[] = | |
18 | "git daemon [--verbose] [--syslog] [--export-all]\n" | |
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" | |
23 | " [--reuseaddr] [--pid-file=<file>]\n" | |
24 | " [--(enable|disable|allow-override|forbid-override)=<service>]\n" | |
25 | " [--access-hook=<path>]\n" | |
26 | " [--inetd | [--listen=<host_or_ipaddr>] [--port=<n>]\n" | |
27 | " [--detach] [--user=<user> [--group=<group>]]\n" | |
28 | " [<directory>...]"; | |
29 | ||
30 | /* List of acceptable pathname prefixes */ | |
31 | static const char **ok_paths; | |
32 | static int strict_paths; | |
33 | ||
34 | /* If this is set, git-daemon-export-ok is not required */ | |
35 | static int export_all_trees; | |
36 | ||
37 | /* Take all paths relative to this one if non-NULL */ | |
38 | static const char *base_path; | |
39 | static const char *interpolated_path; | |
40 | static int base_path_relaxed; | |
41 | ||
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 | */ | |
46 | static const char *user_path; | |
47 | ||
48 | /* Timeout, and initial timeout */ | |
49 | static unsigned int timeout; | |
50 | static unsigned int init_timeout; | |
51 | ||
52 | struct 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 | }; | |
60 | ||
61 | static void lookup_hostname(struct hostinfo *hi); | |
62 | ||
63 | static const char *get_canon_hostname(struct hostinfo *hi) | |
64 | { | |
65 | lookup_hostname(hi); | |
66 | return hi->canon_hostname.buf; | |
67 | } | |
68 | ||
69 | static const char *get_ip_address(struct hostinfo *hi) | |
70 | { | |
71 | lookup_hostname(hi); | |
72 | return hi->ip_address.buf; | |
73 | } | |
74 | ||
75 | static void logreport(int priority, const char *err, va_list params) | |
76 | { | |
77 | if (log_syslog) { | |
78 | char buf[1024]; | |
79 | vsnprintf(buf, sizeof(buf), err, params); | |
80 | syslog(priority, "%s", buf); | |
81 | } else { | |
82 | /* | |
83 | * Since stderr is set to buffered mode, the | |
84 | * logging of different processes will not overlap | |
85 | * unless they overflow the (rather big) buffers. | |
86 | */ | |
87 | fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid()); | |
88 | vfprintf(stderr, err, params); | |
89 | fputc('\n', stderr); | |
90 | fflush(stderr); | |
91 | } | |
92 | } | |
93 | ||
94 | __attribute__((format (printf, 1, 2))) | |
95 | static void logerror(const char *err, ...) | |
96 | { | |
97 | va_list params; | |
98 | va_start(params, err); | |
99 | logreport(LOG_ERR, err, params); | |
100 | va_end(params); | |
101 | } | |
102 | ||
103 | __attribute__((format (printf, 1, 2))) | |
104 | static void loginfo(const char *err, ...) | |
105 | { | |
106 | va_list params; | |
107 | if (!verbose) | |
108 | return; | |
109 | va_start(params, err); | |
110 | logreport(LOG_INFO, err, params); | |
111 | va_end(params); | |
112 | } | |
113 | ||
114 | static void NORETURN daemon_die(const char *err, va_list params) | |
115 | { | |
116 | logreport(LOG_ERR, err, params); | |
117 | exit(1); | |
118 | } | |
119 | ||
120 | struct expand_path_context { | |
121 | const char *directory; | |
122 | struct hostinfo *hostinfo; | |
123 | }; | |
124 | ||
125 | static size_t expand_path(struct strbuf *sb, const char *placeholder, void *ctx) | |
126 | { | |
127 | struct expand_path_context *context = ctx; | |
128 | struct hostinfo *hi = context->hostinfo; | |
129 | ||
130 | switch (placeholder[0]) { | |
131 | case 'H': | |
132 | strbuf_addbuf(sb, &hi->hostname); | |
133 | return 1; | |
134 | case 'C': | |
135 | if (placeholder[1] == 'H') { | |
136 | strbuf_addstr(sb, get_canon_hostname(hi)); | |
137 | return 2; | |
138 | } | |
139 | break; | |
140 | case 'I': | |
141 | if (placeholder[1] == 'P') { | |
142 | strbuf_addstr(sb, get_ip_address(hi)); | |
143 | return 2; | |
144 | } | |
145 | break; | |
146 | case 'P': | |
147 | strbuf_addbuf(sb, &hi->tcp_port); | |
148 | return 1; | |
149 | case 'D': | |
150 | strbuf_addstr(sb, context->directory); | |
151 | return 1; | |
152 | } | |
153 | return 0; | |
154 | } | |
155 | ||
156 | static const char *path_ok(const char *directory, struct hostinfo *hi) | |
157 | { | |
158 | static char rpath[PATH_MAX]; | |
159 | static char interp_path[PATH_MAX]; | |
160 | size_t rlen; | |
161 | const char *path; | |
162 | const char *dir; | |
163 | ||
164 | dir = directory; | |
165 | ||
166 | if (daemon_avoid_alias(dir)) { | |
167 | logerror("'%s': aliased", dir); | |
168 | return NULL; | |
169 | } | |
170 | ||
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); | |
182 | const char *slash = strchr(dir, '/'); | |
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); | |
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 | } | |
194 | dir = rpath; | |
195 | } | |
196 | } | |
197 | else if (interpolated_path && hi->saw_extended_args) { | |
198 | struct strbuf expanded_path = STRBUF_INIT; | |
199 | struct expand_path_context context; | |
200 | ||
201 | context.directory = directory; | |
202 | context.hostinfo = hi; | |
203 | ||
204 | if (*dir != '/') { | |
205 | /* Allow only absolute */ | |
206 | logerror("'%s': Non-absolute path denied (interpolated-path active)", dir); | |
207 | return NULL; | |
208 | } | |
209 | ||
210 | strbuf_expand(&expanded_path, interpolated_path, | |
211 | expand_path, &context); | |
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 | ||
221 | strbuf_release(&expanded_path); | |
222 | loginfo("Interpolated dir '%s'", interp_path); | |
223 | ||
224 | dir = interp_path; | |
225 | } | |
226 | else if (base_path) { | |
227 | if (*dir != '/') { | |
228 | /* Allow only absolute */ | |
229 | logerror("'%s': Non-absolute path denied (base-path active)", dir); | |
230 | return NULL; | |
231 | } | |
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 | } | |
237 | dir = rpath; | |
238 | } | |
239 | ||
240 | path = enter_repo(dir, strict_paths); | |
241 | if (!path && base_path && base_path_relaxed) { | |
242 | /* | |
243 | * if we fail and base_path_relaxed is enabled, try without | |
244 | * prefixing the base path | |
245 | */ | |
246 | dir = directory; | |
247 | path = enter_repo(dir, strict_paths); | |
248 | } | |
249 | ||
250 | if (!path) { | |
251 | logerror("'%s' does not appear to be a git repository", dir); | |
252 | return NULL; | |
253 | } | |
254 | ||
255 | if ( ok_paths && *ok_paths ) { | |
256 | const char **pp; | |
257 | int pathlen = strlen(path); | |
258 | ||
259 | /* The validation is done on the paths after enter_repo | |
260 | * appends optional {.git,.git/.git} and friends, but | |
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/. | |
265 | */ | |
266 | for ( pp = ok_paths ; *pp ; pp++ ) { | |
267 | int len = strlen(*pp); | |
268 | if (len <= pathlen && | |
269 | !memcmp(*pp, path, len) && | |
270 | (path[len] == '\0' || | |
271 | (!strict_paths && path[len] == '/'))) | |
272 | return path; | |
273 | } | |
274 | } | |
275 | else { | |
276 | /* be backwards compatible */ | |
277 | if (!strict_paths) | |
278 | return path; | |
279 | } | |
280 | ||
281 | logerror("'%s': not in whitelist", path); | |
282 | return NULL; /* Fallthrough. Deny by default */ | |
283 | } | |
284 | ||
285 | typedef int (*daemon_service_fn)(void); | |
286 | struct daemon_service { | |
287 | const char *name; | |
288 | const char *config_name; | |
289 | daemon_service_fn fn; | |
290 | int enabled; | |
291 | int overridable; | |
292 | }; | |
293 | ||
294 | static int daemon_error(const char *dir, const char *msg) | |
295 | { | |
296 | if (!informative_errors) | |
297 | msg = "access denied or repository not exported"; | |
298 | packet_write_fmt(1, "ERR %s: %s", msg, dir); | |
299 | return -1; | |
300 | } | |
301 | ||
302 | static const char *access_hook; | |
303 | ||
304 | static int run_access_hook(struct daemon_service *service, const char *dir, | |
305 | const char *path, struct hostinfo *hi) | |
306 | { | |
307 | struct child_process child = CHILD_PROCESS_INIT; | |
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 | ||
314 | *arg++ = access_hook; | |
315 | *arg++ = service->name; | |
316 | *arg++ = path; | |
317 | *arg++ = hi->hostname.buf; | |
318 | *arg++ = get_canon_hostname(hi); | |
319 | *arg++ = get_ip_address(hi); | |
320 | *arg++ = hi->tcp_port.buf; | |
321 | *arg = NULL; | |
322 | ||
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 | ||
352 | error_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 | ||
365 | static int run_service(const char *dir, struct daemon_service *service, | |
366 | struct hostinfo *hi) | |
367 | { | |
368 | const char *path; | |
369 | int enabled = service->enabled; | |
370 | struct strbuf var = STRBUF_INIT; | |
371 | ||
372 | loginfo("Request %s for '%s'", service->name, dir); | |
373 | ||
374 | if (!enabled && !service->overridable) { | |
375 | logerror("'%s': service not enabled.", service->name); | |
376 | errno = EACCES; | |
377 | return daemon_error(dir, "service not enabled"); | |
378 | } | |
379 | ||
380 | if (!(path = path_ok(dir, hi))) | |
381 | return daemon_error(dir, "no such repository"); | |
382 | ||
383 | /* | |
384 | * Security on the cheap. | |
385 | * | |
386 | * We want a readable HEAD, usable "objects" directory, and | |
387 | * a "git-daemon-export-ok" flag that says that the other side | |
388 | * is ok with us doing this. | |
389 | * | |
390 | * path_ok() uses enter_repo() and does whitelist checking. | |
391 | * We only need to make sure the repository is exported. | |
392 | */ | |
393 | ||
394 | if (!export_all_trees && access("git-daemon-export-ok", F_OK)) { | |
395 | logerror("'%s': repository not exported.", path); | |
396 | errno = EACCES; | |
397 | return daemon_error(dir, "repository not exported"); | |
398 | } | |
399 | ||
400 | if (service->overridable) { | |
401 | strbuf_addf(&var, "daemon.%s", service->config_name); | |
402 | git_config_get_bool(var.buf, &enabled); | |
403 | strbuf_release(&var); | |
404 | } | |
405 | if (!enabled) { | |
406 | logerror("'%s': service not enabled for '%s'", | |
407 | service->name, path); | |
408 | errno = EACCES; | |
409 | return daemon_error(dir, "service not enabled"); | |
410 | } | |
411 | ||
412 | /* | |
413 | * Optionally, a hook can choose to deny access to the | |
414 | * repository depending on the phase of the moon. | |
415 | */ | |
416 | if (access_hook && run_access_hook(service, dir, path, hi)) | |
417 | return -1; | |
418 | ||
419 | /* | |
420 | * We'll ignore SIGTERM from now on, we have a | |
421 | * good client. | |
422 | */ | |
423 | signal(SIGTERM, SIG_IGN); | |
424 | ||
425 | return service->fn(); | |
426 | } | |
427 | ||
428 | static 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 | ||
440 | while (strbuf_getline_lf(&line, fp) != EOF) { | |
441 | logerror("%s", line.buf); | |
442 | strbuf_setlen(&line, 0); | |
443 | } | |
444 | ||
445 | strbuf_release(&line); | |
446 | fclose(fp); | |
447 | } | |
448 | ||
449 | static int run_service_command(struct child_process *cld) | |
450 | { | |
451 | argv_array_push(&cld->args, "."); | |
452 | cld->git_cmd = 1; | |
453 | cld->err = -1; | |
454 | if (start_command(cld)) | |
455 | return -1; | |
456 | ||
457 | close(0); | |
458 | close(1); | |
459 | ||
460 | copy_to_log(cld->err); | |
461 | ||
462 | return finish_command(cld); | |
463 | } | |
464 | ||
465 | static int upload_pack(void) | |
466 | { | |
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); | |
471 | } | |
472 | ||
473 | static int upload_archive(void) | |
474 | { | |
475 | struct child_process cld = CHILD_PROCESS_INIT; | |
476 | argv_array_push(&cld.args, "upload-archive"); | |
477 | return run_service_command(&cld); | |
478 | } | |
479 | ||
480 | static int receive_pack(void) | |
481 | { | |
482 | struct child_process cld = CHILD_PROCESS_INIT; | |
483 | argv_array_push(&cld.args, "receive-pack"); | |
484 | return run_service_command(&cld); | |
485 | } | |
486 | ||
487 | static struct daemon_service daemon_service[] = { | |
488 | { "upload-archive", "uploadarch", upload_archive, 0, 1 }, | |
489 | { "upload-pack", "uploadpack", upload_pack, 1, 1 }, | |
490 | { "receive-pack", "receivepack", receive_pack, 0, 1 }, | |
491 | }; | |
492 | ||
493 | static void enable_service(const char *name, int ena) | |
494 | { | |
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 | ||
505 | static void make_service_overridable(const char *name, int ena) | |
506 | { | |
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 | ||
517 | static 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) | |
525 | die("Invalid request ('[' without ']')"); | |
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) { | |
538 | **port = '\0'; | |
539 | ++*port; | |
540 | } | |
541 | } | |
542 | } | |
543 | ||
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 | */ | |
550 | static void sanitize_client(struct strbuf *out, const char *in) | |
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 | ||
564 | /* | |
565 | * Like sanitize_client, but we also perform any canonicalization | |
566 | * to make life easier on the admin. | |
567 | */ | |
568 | static void canonicalize_client(struct strbuf *out, const char *in) | |
569 | { | |
570 | sanitize_client(out, in); | |
571 | strbuf_tolower(out); | |
572 | } | |
573 | ||
574 | /* | |
575 | * Read the host as supplied by the client connection. | |
576 | */ | |
577 | static void parse_host_arg(struct hostinfo *hi, char *extra_args, int buflen) | |
578 | { | |
579 | char *val; | |
580 | int vallen; | |
581 | char *end = extra_args + buflen; | |
582 | ||
583 | if (extra_args < end && *extra_args) { | |
584 | hi->saw_extended_args = 1; | |
585 | if (strncasecmp("host=", extra_args, 5) == 0) { | |
586 | val = extra_args + 5; | |
587 | vallen = strlen(val) + 1; | |
588 | if (*val) { | |
589 | /* Split <host>:<port> at colon. */ | |
590 | char *host; | |
591 | char *port; | |
592 | parse_host_and_port(val, &host, &port); | |
593 | if (port) | |
594 | sanitize_client(&hi->tcp_port, port); | |
595 | canonicalize_client(&hi->hostname, host); | |
596 | hi->hostname_lookup_done = 0; | |
597 | } | |
598 | ||
599 | /* On to the next one */ | |
600 | extra_args = val + vallen; | |
601 | } | |
602 | if (extra_args < end && *extra_args) | |
603 | die("Invalid request"); | |
604 | } | |
605 | } | |
606 | ||
607 | /* | |
608 | * Locate canonical hostname and its IP address. | |
609 | */ | |
610 | static void lookup_hostname(struct hostinfo *hi) | |
611 | { | |
612 | if (!hi->hostname_lookup_done && hi->hostname.len) { | |
613 | #ifndef NO_IPV6 | |
614 | struct addrinfo hints; | |
615 | struct addrinfo *ai; | |
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 | ||
622 | gai = getaddrinfo(hi->hostname.buf, NULL, &hints, &ai); | |
623 | if (!gai) { | |
624 | struct sockaddr_in *sin_addr = (void *)ai->ai_addr; | |
625 | ||
626 | inet_ntop(AF_INET, &sin_addr->sin_addr, | |
627 | addrbuf, sizeof(addrbuf)); | |
628 | strbuf_addstr(&hi->ip_address, addrbuf); | |
629 | ||
630 | if (ai->ai_canonname) | |
631 | sanitize_client(&hi->canon_hostname, | |
632 | ai->ai_canonname); | |
633 | else | |
634 | strbuf_addbuf(&hi->canon_hostname, | |
635 | &hi->ip_address); | |
636 | ||
637 | freeaddrinfo(ai); | |
638 | } | |
639 | #else | |
640 | struct hostent *hent; | |
641 | struct sockaddr_in sa; | |
642 | char **ap; | |
643 | static char addrbuf[HOST_NAME_MAX + 1]; | |
644 | ||
645 | hent = gethostbyname(hi->hostname.buf); | |
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)); | |
655 | ||
656 | sanitize_client(&hi->canon_hostname, hent->h_name); | |
657 | strbuf_addstr(&hi->ip_address, addrbuf); | |
658 | } | |
659 | #endif | |
660 | hi->hostname_lookup_done = 1; | |
661 | } | |
662 | } | |
663 | ||
664 | static 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 | ||
673 | static 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 | } | |
680 | ||
681 | static void set_keep_alive(int sockfd) | |
682 | { | |
683 | int ka = 1; | |
684 | ||
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 | } | |
690 | } | |
691 | ||
692 | static int execute(void) | |
693 | { | |
694 | char *line = packet_buffer; | |
695 | int pktlen, len, i; | |
696 | char *addr = getenv("REMOTE_ADDR"), *port = getenv("REMOTE_PORT"); | |
697 | struct hostinfo hi; | |
698 | ||
699 | hostinfo_init(&hi); | |
700 | ||
701 | if (addr) | |
702 | loginfo("Connection from %s:%s", addr, port); | |
703 | ||
704 | set_keep_alive(0); | |
705 | alarm(init_timeout ? init_timeout : timeout); | |
706 | pktlen = packet_read(0, NULL, NULL, packet_buffer, sizeof(packet_buffer), 0); | |
707 | alarm(0); | |
708 | ||
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); | |
714 | if (len && line[len-1] == '\n') { | |
715 | line[--len] = 0; | |
716 | pktlen--; | |
717 | } | |
718 | ||
719 | if (len != pktlen) | |
720 | parse_host_arg(&hi, line + len + 1, pktlen - len - 1); | |
721 | ||
722 | for (i = 0; i < ARRAY_SIZE(daemon_service); i++) { | |
723 | struct daemon_service *s = &(daemon_service[i]); | |
724 | const char *arg; | |
725 | ||
726 | if (skip_prefix(line, "git-", &arg) && | |
727 | skip_prefix(arg, s->name, &arg) && | |
728 | *arg++ == ' ') { | |
729 | /* | |
730 | * Note: The directory here is probably context sensitive, | |
731 | * and might depend on the actual service being performed. | |
732 | */ | |
733 | int rc = run_service(arg, s, &hi); | |
734 | hostinfo_clear(&hi); | |
735 | return rc; | |
736 | } | |
737 | } | |
738 | ||
739 | hostinfo_clear(&hi); | |
740 | logerror("Protocol error: '%s'", line); | |
741 | return -1; | |
742 | } | |
743 | ||
744 | static int addrcmp(const struct sockaddr_storage *s1, | |
745 | const struct sockaddr_storage *s2) | |
746 | { | |
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) | |
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 | |
757 | if (sa1->sa_family == AF_INET6) | |
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 | ||
765 | static int max_connections = 32; | |
766 | ||
767 | static unsigned int live_children; | |
768 | ||
769 | static struct child { | |
770 | struct child *next; | |
771 | struct child_process cld; | |
772 | struct sockaddr_storage address; | |
773 | } *firstborn; | |
774 | ||
775 | static void add_child(struct child_process *cld, struct sockaddr *addr, socklen_t addrlen) | |
776 | { | |
777 | struct child *newborn, **cradle; | |
778 | ||
779 | newborn = xcalloc(1, sizeof(*newborn)); | |
780 | live_children++; | |
781 | memcpy(&newborn->cld, cld, sizeof(*cld)); | |
782 | memcpy(&newborn->address, addr, addrlen); | |
783 | for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next) | |
784 | if (!addrcmp(&(*cradle)->address, &newborn->address)) | |
785 | break; | |
786 | newborn->next = *cradle; | |
787 | *cradle = newborn; | |
788 | } | |
789 | ||
790 | /* | |
791 | * This gets called if the number of connections grows | |
792 | * past "max_connections". | |
793 | * | |
794 | * We kill the newest connection from a duplicate IP. | |
795 | */ | |
796 | static void kill_some_child(void) | |
797 | { | |
798 | const struct child *blanket, *next; | |
799 | ||
800 | if (!(blanket = firstborn)) | |
801 | return; | |
802 | ||
803 | for (; (next = blanket->next); blanket = next) | |
804 | if (!addrcmp(&blanket->address, &next->address)) { | |
805 | kill(blanket->cld.pid, SIGTERM); | |
806 | break; | |
807 | } | |
808 | } | |
809 | ||
810 | static void check_dead_children(void) | |
811 | { | |
812 | int status; | |
813 | pid_t pid; | |
814 | ||
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--; | |
826 | child_process_clear(&blanket->cld); | |
827 | free(blanket); | |
828 | } else | |
829 | cradle = &blanket->next; | |
830 | } | |
831 | ||
832 | static struct argv_array cld_argv = ARGV_ARRAY_INIT; | |
833 | static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen) | |
834 | { | |
835 | struct child_process cld = CHILD_PROCESS_INIT; | |
836 | ||
837 | if (max_connections && live_children >= max_connections) { | |
838 | kill_some_child(); | |
839 | sleep(1); /* give it some time to die */ | |
840 | check_dead_children(); | |
841 | if (live_children >= max_connections) { | |
842 | close(incoming); | |
843 | logerror("Too many children, dropping connection"); | |
844 | return; | |
845 | } | |
846 | } | |
847 | ||
848 | if (addr->sa_family == AF_INET) { | |
849 | char buf[128] = ""; | |
850 | struct sockaddr_in *sin_addr = (void *) addr; | |
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)); | |
855 | #ifndef NO_IPV6 | |
856 | } else if (addr->sa_family == AF_INET6) { | |
857 | char buf[128] = ""; | |
858 | struct sockaddr_in6 *sin6_addr = (void *) addr; | |
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)); | |
863 | #endif | |
864 | } | |
865 | ||
866 | cld.argv = cld_argv.argv; | |
867 | cld.in = incoming; | |
868 | cld.out = dup(incoming); | |
869 | ||
870 | if (start_command(&cld)) | |
871 | logerror("unable to fork"); | |
872 | else | |
873 | add_child(&cld, addr, addrlen); | |
874 | } | |
875 | ||
876 | static void child_handler(int signo) | |
877 | { | |
878 | /* | |
879 | * Otherwise empty handler because systemcalls will get interrupted | |
880 | * upon signal receipt | |
881 | * SysV needs the handler to be rearmed | |
882 | */ | |
883 | signal(SIGCHLD, child_handler); | |
884 | } | |
885 | ||
886 | static 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 | ||
896 | struct socketlist { | |
897 | int *list; | |
898 | size_t nr; | |
899 | size_t alloc; | |
900 | }; | |
901 | ||
902 | static 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: | |
920 | xsnprintf(ip, sizeof(ip), "<unknown>"); | |
921 | } | |
922 | return ip; | |
923 | } | |
924 | ||
925 | #ifndef NO_IPV6 | |
926 | ||
927 | static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist) | |
928 | { | |
929 | int socknum = 0; | |
930 | char pbuf[NI_MAXSERV]; | |
931 | struct addrinfo hints, *ai0, *ai; | |
932 | int gai; | |
933 | long flags; | |
934 | ||
935 | xsnprintf(pbuf, sizeof(pbuf), "%d", listen_port); | |
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 | ||
942 | gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0); | |
943 | if (gai) { | |
944 | logerror("getaddrinfo() for %s failed: %s", listen_addr, gai_strerror(gai)); | |
945 | return 0; | |
946 | } | |
947 | ||
948 | for (ai = ai0; ai; ai = ai->ai_next) { | |
949 | int sockfd; | |
950 | ||
951 | sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); | |
952 | if (sockfd < 0) | |
953 | continue; | |
954 | if (sockfd >= FD_SETSIZE) { | |
955 | logerror("Socket descriptor too large"); | |
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 | ||
969 | if (set_reuse_addr(sockfd)) { | |
970 | logerror("Could not set SO_REUSEADDR: %s", strerror(errno)); | |
971 | close(sockfd); | |
972 | continue; | |
973 | } | |
974 | ||
975 | set_keep_alive(sockfd); | |
976 | ||
977 | if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) { | |
978 | logerror("Could not bind to %s: %s", | |
979 | ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen), | |
980 | strerror(errno)); | |
981 | close(sockfd); | |
982 | continue; /* not fatal */ | |
983 | } | |
984 | if (listen(sockfd, 5) < 0) { | |
985 | logerror("Could not listen to %s: %s", | |
986 | ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen), | |
987 | strerror(errno)); | |
988 | close(sockfd); | |
989 | continue; /* not fatal */ | |
990 | } | |
991 | ||
992 | flags = fcntl(sockfd, F_GETFD, 0); | |
993 | if (flags >= 0) | |
994 | fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC); | |
995 | ||
996 | ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc); | |
997 | socklist->list[socklist->nr++] = sockfd; | |
998 | socknum++; | |
999 | } | |
1000 | ||
1001 | freeaddrinfo(ai0); | |
1002 | ||
1003 | return socknum; | |
1004 | } | |
1005 | ||
1006 | #else /* NO_IPV6 */ | |
1007 | ||
1008 | static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist) | |
1009 | { | |
1010 | struct sockaddr_in sin; | |
1011 | int sockfd; | |
1012 | long flags; | |
1013 | ||
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 | ||
1026 | sockfd = socket(AF_INET, SOCK_STREAM, 0); | |
1027 | if (sockfd < 0) | |
1028 | return 0; | |
1029 | ||
1030 | if (set_reuse_addr(sockfd)) { | |
1031 | logerror("Could not set SO_REUSEADDR: %s", strerror(errno)); | |
1032 | close(sockfd); | |
1033 | return 0; | |
1034 | } | |
1035 | ||
1036 | set_keep_alive(sockfd); | |
1037 | ||
1038 | if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) { | |
1039 | logerror("Could not bind to %s: %s", | |
1040 | ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)), | |
1041 | strerror(errno)); | |
1042 | close(sockfd); | |
1043 | return 0; | |
1044 | } | |
1045 | ||
1046 | if (listen(sockfd, 5) < 0) { | |
1047 | logerror("Could not listen to %s: %s", | |
1048 | ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)), | |
1049 | strerror(errno)); | |
1050 | close(sockfd); | |
1051 | return 0; | |
1052 | } | |
1053 | ||
1054 | flags = fcntl(sockfd, F_GETFD, 0); | |
1055 | if (flags >= 0) | |
1056 | fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC); | |
1057 | ||
1058 | ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc); | |
1059 | socklist->list[socklist->nr++] = sockfd; | |
1060 | return 1; | |
1061 | } | |
1062 | ||
1063 | #endif | |
1064 | ||
1065 | static void socksetup(struct string_list *listen_addr, int listen_port, struct socketlist *socklist) | |
1066 | { | |
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 | } | |
1080 | } | |
1081 | ||
1082 | static int service_loop(struct socketlist *socklist) | |
1083 | { | |
1084 | struct pollfd *pfd; | |
1085 | int i; | |
1086 | ||
1087 | pfd = xcalloc(socklist->nr, sizeof(struct pollfd)); | |
1088 | ||
1089 | for (i = 0; i < socklist->nr; i++) { | |
1090 | pfd[i].fd = socklist->list[i]; | |
1091 | pfd[i].events = POLLIN; | |
1092 | } | |
1093 | ||
1094 | signal(SIGCHLD, child_handler); | |
1095 | ||
1096 | for (;;) { | |
1097 | int i; | |
1098 | ||
1099 | check_dead_children(); | |
1100 | ||
1101 | if (poll(pfd, socklist->nr, -1) < 0) { | |
1102 | if (errno != EINTR) { | |
1103 | logerror("Poll failed, resuming: %s", | |
1104 | strerror(errno)); | |
1105 | sleep(1); | |
1106 | } | |
1107 | continue; | |
1108 | } | |
1109 | ||
1110 | for (i = 0; i < socklist->nr; i++) { | |
1111 | if (pfd[i].revents & POLLIN) { | |
1112 | union { | |
1113 | struct sockaddr sa; | |
1114 | struct sockaddr_in sai; | |
1115 | #ifndef NO_IPV6 | |
1116 | struct sockaddr_in6 sai6; | |
1117 | #endif | |
1118 | } ss; | |
1119 | socklen_t sslen = sizeof(ss); | |
1120 | int incoming = accept(pfd[i].fd, &ss.sa, &sslen); | |
1121 | if (incoming < 0) { | |
1122 | switch (errno) { | |
1123 | case EAGAIN: | |
1124 | case EINTR: | |
1125 | case ECONNABORTED: | |
1126 | continue; | |
1127 | default: | |
1128 | die_errno("accept returned"); | |
1129 | } | |
1130 | } | |
1131 | handle(incoming, &ss.sa, sslen); | |
1132 | } | |
1133 | } | |
1134 | } | |
1135 | } | |
1136 | ||
1137 | #ifdef NO_POSIX_GOODIES | |
1138 | ||
1139 | struct credentials; | |
1140 | ||
1141 | static void drop_privileges(struct credentials *cred) | |
1142 | { | |
1143 | /* nothing */ | |
1144 | } | |
1145 | ||
1146 | static 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 | ||
1154 | struct credentials { | |
1155 | struct passwd *pass; | |
1156 | gid_t gid; | |
1157 | }; | |
1158 | ||
1159 | static 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 | ||
1166 | static 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 | } | |
1187 | #endif | |
1188 | ||
1189 | static int serve(struct string_list *listen_addr, int listen_port, | |
1190 | struct credentials *cred) | |
1191 | { | |
1192 | struct socketlist socklist = { NULL, 0, 0 }; | |
1193 | ||
1194 | socksetup(listen_addr, listen_port, &socklist); | |
1195 | if (socklist.nr == 0) | |
1196 | die("unable to allocate any listen sockets on port %u", | |
1197 | listen_port); | |
1198 | ||
1199 | drop_privileges(cred); | |
1200 | ||
1201 | loginfo("Ready to rumble"); | |
1202 | ||
1203 | return service_loop(&socklist); | |
1204 | } | |
1205 | ||
1206 | int cmd_main(int argc, const char **argv) | |
1207 | { | |
1208 | int listen_port = 0; | |
1209 | struct string_list listen_addr = STRING_LIST_INIT_NODUP; | |
1210 | int serve_mode = 0, inetd_mode = 0; | |
1211 | const char *pid_file = NULL, *user_name = NULL, *group_name = NULL; | |
1212 | int detach = 0; | |
1213 | struct credentials *cred = NULL; | |
1214 | int i; | |
1215 | ||
1216 | for (i = 1; i < argc; i++) { | |
1217 | const char *arg = argv[i]; | |
1218 | const char *v; | |
1219 | ||
1220 | if (skip_prefix(arg, "--listen=", &v)) { | |
1221 | string_list_append(&listen_addr, xstrdup_tolower(v)); | |
1222 | continue; | |
1223 | } | |
1224 | if (skip_prefix(arg, "--port=", &v)) { | |
1225 | char *end; | |
1226 | unsigned long n; | |
1227 | n = strtoul(v, &end, 0); | |
1228 | if (*v && !*end) { | |
1229 | listen_port = n; | |
1230 | continue; | |
1231 | } | |
1232 | } | |
1233 | if (!strcmp(arg, "--serve")) { | |
1234 | serve_mode = 1; | |
1235 | continue; | |
1236 | } | |
1237 | if (!strcmp(arg, "--inetd")) { | |
1238 | inetd_mode = 1; | |
1239 | log_syslog = 1; | |
1240 | continue; | |
1241 | } | |
1242 | if (!strcmp(arg, "--verbose")) { | |
1243 | verbose = 1; | |
1244 | continue; | |
1245 | } | |
1246 | if (!strcmp(arg, "--syslog")) { | |
1247 | log_syslog = 1; | |
1248 | continue; | |
1249 | } | |
1250 | if (!strcmp(arg, "--export-all")) { | |
1251 | export_all_trees = 1; | |
1252 | continue; | |
1253 | } | |
1254 | if (skip_prefix(arg, "--access-hook=", &v)) { | |
1255 | access_hook = v; | |
1256 | continue; | |
1257 | } | |
1258 | if (skip_prefix(arg, "--timeout=", &v)) { | |
1259 | timeout = atoi(v); | |
1260 | continue; | |
1261 | } | |
1262 | if (skip_prefix(arg, "--init-timeout=", &v)) { | |
1263 | init_timeout = atoi(v); | |
1264 | continue; | |
1265 | } | |
1266 | if (skip_prefix(arg, "--max-connections=", &v)) { | |
1267 | max_connections = atoi(v); | |
1268 | if (max_connections < 0) | |
1269 | max_connections = 0; /* unlimited */ | |
1270 | continue; | |
1271 | } | |
1272 | if (!strcmp(arg, "--strict-paths")) { | |
1273 | strict_paths = 1; | |
1274 | continue; | |
1275 | } | |
1276 | if (skip_prefix(arg, "--base-path=", &v)) { | |
1277 | base_path = v; | |
1278 | continue; | |
1279 | } | |
1280 | if (!strcmp(arg, "--base-path-relaxed")) { | |
1281 | base_path_relaxed = 1; | |
1282 | continue; | |
1283 | } | |
1284 | if (skip_prefix(arg, "--interpolated-path=", &v)) { | |
1285 | interpolated_path = v; | |
1286 | continue; | |
1287 | } | |
1288 | if (!strcmp(arg, "--reuseaddr")) { | |
1289 | reuseaddr = 1; | |
1290 | continue; | |
1291 | } | |
1292 | if (!strcmp(arg, "--user-path")) { | |
1293 | user_path = ""; | |
1294 | continue; | |
1295 | } | |
1296 | if (skip_prefix(arg, "--user-path=", &v)) { | |
1297 | user_path = v; | |
1298 | continue; | |
1299 | } | |
1300 | if (skip_prefix(arg, "--pid-file=", &v)) { | |
1301 | pid_file = v; | |
1302 | continue; | |
1303 | } | |
1304 | if (!strcmp(arg, "--detach")) { | |
1305 | detach = 1; | |
1306 | log_syslog = 1; | |
1307 | continue; | |
1308 | } | |
1309 | if (skip_prefix(arg, "--user=", &v)) { | |
1310 | user_name = v; | |
1311 | continue; | |
1312 | } | |
1313 | if (skip_prefix(arg, "--group=", &v)) { | |
1314 | group_name = v; | |
1315 | continue; | |
1316 | } | |
1317 | if (skip_prefix(arg, "--enable=", &v)) { | |
1318 | enable_service(v, 1); | |
1319 | continue; | |
1320 | } | |
1321 | if (skip_prefix(arg, "--disable=", &v)) { | |
1322 | enable_service(v, 0); | |
1323 | continue; | |
1324 | } | |
1325 | if (skip_prefix(arg, "--allow-override=", &v)) { | |
1326 | make_service_overridable(v, 1); | |
1327 | continue; | |
1328 | } | |
1329 | if (skip_prefix(arg, "--forbid-override=", &v)) { | |
1330 | make_service_overridable(v, 0); | |
1331 | continue; | |
1332 | } | |
1333 | if (!strcmp(arg, "--informative-errors")) { | |
1334 | informative_errors = 1; | |
1335 | continue; | |
1336 | } | |
1337 | if (!strcmp(arg, "--no-informative-errors")) { | |
1338 | informative_errors = 0; | |
1339 | continue; | |
1340 | } | |
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 | } | |
1348 | ||
1349 | usage(daemon_usage); | |
1350 | } | |
1351 | ||
1352 | if (log_syslog) { | |
1353 | openlog("git-daemon", LOG_PID, LOG_DAEMON); | |
1354 | set_die_routine(daemon_die); | |
1355 | } else | |
1356 | /* avoid splitting a message in the middle */ | |
1357 | setvbuf(stderr, NULL, _IOFBF, 4096); | |
1358 | ||
1359 | if (inetd_mode && (detach || group_name || user_name)) | |
1360 | die("--detach, --user and --group are incompatible with --inetd"); | |
1361 | ||
1362 | if (inetd_mode && (listen_port || (listen_addr.nr > 0))) | |
1363 | die("--listen= and --port= are incompatible with --inetd"); | |
1364 | else if (listen_port == 0) | |
1365 | listen_port = DEFAULT_GIT_PORT; | |
1366 | ||
1367 | if (group_name && !user_name) | |
1368 | die("--group supplied without --user"); | |
1369 | ||
1370 | if (user_name) | |
1371 | cred = prepare_credentials(user_name, group_name); | |
1372 | ||
1373 | if (strict_paths && (!ok_paths || !*ok_paths)) | |
1374 | die("option --strict-paths requires a whitelist"); | |
1375 | ||
1376 | if (base_path && !is_directory(base_path)) | |
1377 | die("base-path '%s' does not exist or is not a directory", | |
1378 | base_path); | |
1379 | ||
1380 | if (inetd_mode) { | |
1381 | if (!freopen("/dev/null", "w", stderr)) | |
1382 | die_errno("failed to redirect stderr to /dev/null"); | |
1383 | } | |
1384 | ||
1385 | if (inetd_mode || serve_mode) | |
1386 | return execute(); | |
1387 | ||
1388 | if (detach) { | |
1389 | if (daemonize()) | |
1390 | die("--detach not supported on this platform"); | |
1391 | } | |
1392 | ||
1393 | if (pid_file) | |
1394 | write_file(pid_file, "%"PRIuMAX, (uintmax_t) getpid()); | |
1395 | ||
1396 | /* prepare argv for serving-processes */ | |
1397 | argv_array_push(&cld_argv, argv[0]); /* git-daemon */ | |
1398 | argv_array_push(&cld_argv, "--serve"); | |
1399 | for (i = 1; i < argc; ++i) | |
1400 | argv_array_push(&cld_argv, argv[i]); | |
1401 | ||
1402 | return serve(&listen_addr, listen_port, cred); | |
1403 | } |