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