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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 | ||
2844923d MD |
12 | #ifdef NO_INITGROUPS |
13 | #define initgroups(x, y) (0) /* nothing */ | |
14 | #endif | |
15 | ||
9048fe1c | 16 | static int log_syslog; |
f8ff0c06 | 17 | static int verbose; |
1955fabf | 18 | static int reuseaddr; |
d5570f4d | 19 | static int informative_errors; |
f8ff0c06 | 20 | |
960deccb | 21 | static const char daemon_usage[] = |
1b1dd23f | 22 | "git daemon [--verbose] [--syslog] [--export-all]\n" |
62b4698e ŠN |
23 | " [--timeout=<n>] [--init-timeout=<n>] [--max-connections=<n>]\n" |
24 | " [--strict-paths] [--base-path=<path>] [--base-path-relaxed]\n" | |
25 | " [--user-path | --user-path=<path>]\n" | |
26 | " [--interpolated-path=<path>]\n" | |
9cddf56e | 27 | " [--reuseaddr] [--pid-file=<file>]\n" |
62b4698e | 28 | " [--(enable|disable|allow-override|forbid-override)=<service>]\n" |
93741e4a | 29 | " [--access-hook=<path>]\n" |
62b4698e | 30 | " [--inetd | [--listen=<host_or_ipaddr>] [--port=<n>]\n" |
9cddf56e | 31 | " [--detach] [--user=<user> [--group=<group>]]\n" |
62b4698e | 32 | " [<directory>...]"; |
4ae95682 PA |
33 | |
34 | /* List of acceptable pathname prefixes */ | |
96f1e58f DR |
35 | static char **ok_paths; |
36 | static int strict_paths; | |
4ae95682 PA |
37 | |
38 | /* If this is set, git-daemon-export-ok is not required */ | |
96f1e58f | 39 | static int export_all_trees; |
f8ff0c06 | 40 | |
b21c31c9 | 41 | /* Take all paths relative to this one if non-NULL */ |
1055a890 JK |
42 | static const char *base_path; |
43 | static const char *interpolated_path; | |
73a7a656 | 44 | static int base_path_relaxed; |
49ba83fb JL |
45 | |
46 | /* Flag indicating client sent extra args. */ | |
47 | static int saw_extended_args; | |
b21c31c9 | 48 | |
603968d2 JH |
49 | /* If defined, ~user notation is allowed and the string is inserted |
50 | * after ~user/. E.g. a request to git://host/~alice/frotz would | |
51 | * go to /home/alice/pub_git/frotz with --user-path=pub_git. | |
52 | */ | |
96f1e58f | 53 | static const char *user_path; |
603968d2 | 54 | |
960deccb | 55 | /* Timeout, and initial timeout */ |
96f1e58f DR |
56 | static unsigned int timeout; |
57 | static unsigned int init_timeout; | |
f8ff0c06 | 58 | |
7a646cec RS |
59 | static struct strbuf hostname = STRBUF_INIT; |
60 | static struct strbuf canon_hostname = STRBUF_INIT; | |
61 | static struct strbuf ip_address = STRBUF_INIT; | |
62 | static struct strbuf tcp_port = STRBUF_INIT; | |
49ba83fb | 63 | |
edef953e RS |
64 | static int hostname_lookup_done; |
65 | ||
66 | static void lookup_hostname(void); | |
67 | ||
68 | static const char *get_canon_hostname(void) | |
69 | { | |
70 | lookup_hostname(); | |
7a646cec | 71 | return canon_hostname.buf; |
edef953e RS |
72 | } |
73 | ||
74 | static const char *get_ip_address(void) | |
75 | { | |
76 | lookup_hostname(); | |
7a646cec | 77 | return ip_address.buf; |
edef953e RS |
78 | } |
79 | ||
9048fe1c | 80 | static void logreport(int priority, const char *err, va_list params) |
f8ff0c06 | 81 | { |
9048fe1c | 82 | if (log_syslog) { |
6a992e9e SB |
83 | char buf[1024]; |
84 | vsnprintf(buf, sizeof(buf), err, params); | |
9048fe1c | 85 | syslog(priority, "%s", buf); |
460c2010 JH |
86 | } else { |
87 | /* | |
48cfaea1 | 88 | * Since stderr is set to buffered mode, the |
6a992e9e | 89 | * logging of different processes will not overlap |
48cfaea1 | 90 | * unless they overflow the (rather big) buffers. |
6a992e9e | 91 | */ |
85e72830 | 92 | fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid()); |
6a992e9e SB |
93 | vfprintf(stderr, err, params); |
94 | fputc('\n', stderr); | |
48cfaea1 | 95 | fflush(stderr); |
6a992e9e | 96 | } |
f8ff0c06 PB |
97 | } |
98 | ||
28bea9e5 | 99 | __attribute__((format (printf, 1, 2))) |
cdda4745 | 100 | static void logerror(const char *err, ...) |
f8ff0c06 PB |
101 | { |
102 | va_list params; | |
103 | va_start(params, err); | |
9048fe1c | 104 | logreport(LOG_ERR, err, params); |
f8ff0c06 PB |
105 | va_end(params); |
106 | } | |
107 | ||
28bea9e5 | 108 | __attribute__((format (printf, 1, 2))) |
cdda4745 | 109 | static void loginfo(const char *err, ...) |
f8ff0c06 PB |
110 | { |
111 | va_list params; | |
112 | if (!verbose) | |
113 | return; | |
114 | va_start(params, err); | |
9048fe1c | 115 | logreport(LOG_INFO, err, params); |
f8ff0c06 PB |
116 | va_end(params); |
117 | } | |
a87e8be2 | 118 | |
ad8b4f56 ML |
119 | static void NORETURN daemon_die(const char *err, va_list params) |
120 | { | |
121 | logreport(LOG_ERR, err, params); | |
122 | exit(1); | |
123 | } | |
124 | ||
dc8edc8f RS |
125 | struct expand_path_context { |
126 | const char *directory; | |
127 | }; | |
128 | ||
129 | static size_t expand_path(struct strbuf *sb, const char *placeholder, void *ctx) | |
130 | { | |
131 | struct expand_path_context *context = ctx; | |
132 | ||
133 | switch (placeholder[0]) { | |
134 | case 'H': | |
7a646cec | 135 | strbuf_addbuf(sb, &hostname); |
dc8edc8f RS |
136 | return 1; |
137 | case 'C': | |
138 | if (placeholder[1] == 'H') { | |
7a646cec | 139 | strbuf_addstr(sb, get_canon_hostname()); |
dc8edc8f RS |
140 | return 2; |
141 | } | |
142 | break; | |
143 | case 'I': | |
144 | if (placeholder[1] == 'P') { | |
7a646cec | 145 | strbuf_addstr(sb, get_ip_address()); |
dc8edc8f RS |
146 | return 2; |
147 | } | |
148 | break; | |
149 | case 'P': | |
7a646cec | 150 | strbuf_addbuf(sb, &tcp_port); |
dc8edc8f RS |
151 | return 1; |
152 | case 'D': | |
153 | strbuf_addstr(sb, context->directory); | |
154 | return 1; | |
155 | } | |
156 | return 0; | |
157 | } | |
158 | ||
1055a890 | 159 | static const char *path_ok(const char *directory) |
4ae95682 | 160 | { |
603968d2 | 161 | static char rpath[PATH_MAX]; |
49ba83fb | 162 | static char interp_path[PATH_MAX]; |
1c64b48e | 163 | const char *path; |
1055a890 | 164 | const char *dir; |
49ba83fb | 165 | |
9d7ca667 | 166 | dir = directory; |
d79374c7 | 167 | |
34b6cb8b | 168 | if (daemon_avoid_alias(dir)) { |
d79374c7 JH |
169 | logerror("'%s': aliased", dir); |
170 | return NULL; | |
171 | } | |
172 | ||
603968d2 JH |
173 | if (*dir == '~') { |
174 | if (!user_path) { | |
175 | logerror("'%s': User-path not allowed", dir); | |
176 | return NULL; | |
177 | } | |
178 | if (*user_path) { | |
179 | /* Got either "~alice" or "~alice/foo"; | |
180 | * rewrite them to "~alice/%s" or | |
181 | * "~alice/%s/foo". | |
182 | */ | |
183 | int namlen, restlen = strlen(dir); | |
1055a890 | 184 | const char *slash = strchr(dir, '/'); |
603968d2 JH |
185 | if (!slash) |
186 | slash = dir + restlen; | |
187 | namlen = slash - dir; | |
188 | restlen -= namlen; | |
189 | loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash); | |
190 | snprintf(rpath, PATH_MAX, "%.*s/%s%.*s", | |
191 | namlen, dir, user_path, restlen, slash); | |
192 | dir = rpath; | |
193 | } | |
194 | } | |
49ba83fb | 195 | else if (interpolated_path && saw_extended_args) { |
9d7ca667 | 196 | struct strbuf expanded_path = STRBUF_INIT; |
dc8edc8f RS |
197 | struct expand_path_context context; |
198 | ||
199 | context.directory = directory; | |
200 | ||
49ba83fb JL |
201 | if (*dir != '/') { |
202 | /* Allow only absolute */ | |
203 | logerror("'%s': Non-absolute path denied (interpolated-path active)", dir); | |
204 | return NULL; | |
205 | } | |
206 | ||
9d7ca667 | 207 | strbuf_expand(&expanded_path, interpolated_path, |
dc8edc8f | 208 | expand_path, &context); |
9d7ca667 RS |
209 | strlcpy(interp_path, expanded_path.buf, PATH_MAX); |
210 | strbuf_release(&expanded_path); | |
49ba83fb JL |
211 | loginfo("Interpolated dir '%s'", interp_path); |
212 | ||
213 | dir = interp_path; | |
214 | } | |
603968d2 JH |
215 | else if (base_path) { |
216 | if (*dir != '/') { | |
217 | /* Allow only absolute */ | |
1fda3d55 | 218 | logerror("'%s': Non-absolute path denied (base-path active)", dir); |
b21c31c9 PB |
219 | return NULL; |
220 | } | |
49ba83fb JL |
221 | snprintf(rpath, PATH_MAX, "%s%s", base_path, dir); |
222 | dir = rpath; | |
b21c31c9 PB |
223 | } |
224 | ||
a583971f RS |
225 | path = enter_repo(dir, strict_paths); |
226 | if (!path && base_path && base_path_relaxed) { | |
73a7a656 JA |
227 | /* |
228 | * if we fail and base_path_relaxed is enabled, try without | |
229 | * prefixing the base path | |
230 | */ | |
a583971f RS |
231 | dir = directory; |
232 | path = enter_repo(dir, strict_paths); | |
233 | } | |
3e04c62d | 234 | |
4dbd1352 | 235 | if (!path) { |
05ac6b34 | 236 | logerror("'%s' does not appear to be a git repository", dir); |
4dbd1352 | 237 | return NULL; |
4ae95682 PA |
238 | } |
239 | ||
240 | if ( ok_paths && *ok_paths ) { | |
ce335fe0 | 241 | char **pp; |
4dbd1352 | 242 | int pathlen = strlen(path); |
4ae95682 | 243 | |
ce335fe0 | 244 | /* The validation is done on the paths after enter_repo |
a6080a0a | 245 | * appends optional {.git,.git/.git} and friends, but |
d79374c7 JH |
246 | * it does not use getcwd(). So if your /pub is |
247 | * a symlink to /mnt/pub, you can whitelist /pub and | |
248 | * do not have to say /mnt/pub. | |
249 | * Do not say /pub/. | |
ce335fe0 | 250 | */ |
4ae95682 PA |
251 | for ( pp = ok_paths ; *pp ; pp++ ) { |
252 | int len = strlen(*pp); | |
ce335fe0 JH |
253 | if (len <= pathlen && |
254 | !memcmp(*pp, path, len) && | |
255 | (path[len] == '\0' || | |
256 | (!strict_paths && path[len] == '/'))) | |
257 | return path; | |
4ae95682 | 258 | } |
4dbd1352 AE |
259 | } |
260 | else { | |
261 | /* be backwards compatible */ | |
262 | if (!strict_paths) | |
263 | return path; | |
4ae95682 PA |
264 | } |
265 | ||
4dbd1352 AE |
266 | logerror("'%s': not in whitelist", path); |
267 | return NULL; /* Fallthrough. Deny by default */ | |
4ae95682 | 268 | } |
a87e8be2 | 269 | |
d819e4e6 JH |
270 | typedef int (*daemon_service_fn)(void); |
271 | struct daemon_service { | |
272 | const char *name; | |
273 | const char *config_name; | |
274 | daemon_service_fn fn; | |
275 | int enabled; | |
276 | int overridable; | |
277 | }; | |
278 | ||
d5570f4d JK |
279 | static int daemon_error(const char *dir, const char *msg) |
280 | { | |
281 | if (!informative_errors) | |
282 | msg = "access denied or repository not exported"; | |
283 | packet_write(1, "ERR %s: %s", msg, dir); | |
284 | return -1; | |
285 | } | |
286 | ||
1055a890 | 287 | static const char *access_hook; |
93741e4a JH |
288 | |
289 | static int run_access_hook(struct daemon_service *service, const char *dir, const char *path) | |
290 | { | |
d3180279 | 291 | struct child_process child = CHILD_PROCESS_INIT; |
93741e4a JH |
292 | struct strbuf buf = STRBUF_INIT; |
293 | const char *argv[8]; | |
294 | const char **arg = argv; | |
295 | char *eol; | |
296 | int seen_errors = 0; | |
297 | ||
93741e4a JH |
298 | *arg++ = access_hook; |
299 | *arg++ = service->name; | |
300 | *arg++ = path; | |
7a646cec RS |
301 | *arg++ = hostname.buf; |
302 | *arg++ = get_canon_hostname(); | |
303 | *arg++ = get_ip_address(); | |
304 | *arg++ = tcp_port.buf; | |
93741e4a | 305 | *arg = NULL; |
93741e4a | 306 | |
93741e4a JH |
307 | child.use_shell = 1; |
308 | child.argv = argv; | |
309 | child.no_stdin = 1; | |
310 | child.no_stderr = 1; | |
311 | child.out = -1; | |
312 | if (start_command(&child)) { | |
313 | logerror("daemon access hook '%s' failed to start", | |
314 | access_hook); | |
315 | goto error_return; | |
316 | } | |
317 | if (strbuf_read(&buf, child.out, 0) < 0) { | |
318 | logerror("failed to read from pipe to daemon access hook '%s'", | |
319 | access_hook); | |
320 | strbuf_reset(&buf); | |
321 | seen_errors = 1; | |
322 | } | |
323 | if (close(child.out) < 0) { | |
324 | logerror("failed to close pipe to daemon access hook '%s'", | |
325 | access_hook); | |
326 | seen_errors = 1; | |
327 | } | |
328 | if (finish_command(&child)) | |
329 | seen_errors = 1; | |
330 | ||
331 | if (!seen_errors) { | |
332 | strbuf_release(&buf); | |
333 | return 0; | |
334 | } | |
335 | ||
336 | error_return: | |
337 | strbuf_ltrim(&buf); | |
338 | if (!buf.len) | |
339 | strbuf_addstr(&buf, "service rejected"); | |
340 | eol = strchr(buf.buf, '\n'); | |
341 | if (eol) | |
342 | *eol = '\0'; | |
343 | errno = EACCES; | |
344 | daemon_error(dir, buf.buf); | |
345 | strbuf_release(&buf); | |
346 | return -1; | |
347 | } | |
348 | ||
1055a890 | 349 | static int run_service(const char *dir, struct daemon_service *service) |
a87e8be2 | 350 | { |
4dbd1352 | 351 | const char *path; |
d819e4e6 | 352 | int enabled = service->enabled; |
8939d32d | 353 | struct strbuf var = STRBUF_INIT; |
d819e4e6 | 354 | |
a47551c3 | 355 | loginfo("Request %s for '%s'", service->name, dir); |
4dbd1352 | 356 | |
d819e4e6 JH |
357 | if (!enabled && !service->overridable) { |
358 | logerror("'%s': service not enabled.", service->name); | |
359 | errno = EACCES; | |
d5570f4d | 360 | return daemon_error(dir, "service not enabled"); |
d819e4e6 | 361 | } |
4ae95682 | 362 | |
a47551c3 | 363 | if (!(path = path_ok(dir))) |
d5570f4d | 364 | return daemon_error(dir, "no such repository"); |
47888f0f | 365 | |
a87e8be2 LT |
366 | /* |
367 | * Security on the cheap. | |
368 | * | |
a935c397 | 369 | * We want a readable HEAD, usable "objects" directory, and |
a87e8be2 LT |
370 | * a "git-daemon-export-ok" flag that says that the other side |
371 | * is ok with us doing this. | |
4dbd1352 AE |
372 | * |
373 | * path_ok() uses enter_repo() and does whitelist checking. | |
374 | * We only need to make sure the repository is exported. | |
a87e8be2 | 375 | */ |
4dbd1352 | 376 | |
3e04c62d | 377 | if (!export_all_trees && access("git-daemon-export-ok", F_OK)) { |
4dbd1352 | 378 | logerror("'%s': repository not exported.", path); |
3e04c62d | 379 | errno = EACCES; |
d5570f4d | 380 | return daemon_error(dir, "repository not exported"); |
3e04c62d PA |
381 | } |
382 | ||
d819e4e6 | 383 | if (service->overridable) { |
8939d32d TA |
384 | strbuf_addf(&var, "daemon.%s", service->config_name); |
385 | git_config_get_bool(var.buf, &enabled); | |
386 | strbuf_release(&var); | |
d819e4e6 JH |
387 | } |
388 | if (!enabled) { | |
389 | logerror("'%s': service not enabled for '%s'", | |
390 | service->name, path); | |
391 | errno = EACCES; | |
d5570f4d | 392 | return daemon_error(dir, "service not enabled"); |
d819e4e6 JH |
393 | } |
394 | ||
93741e4a JH |
395 | /* |
396 | * Optionally, a hook can choose to deny access to the | |
397 | * repository depending on the phase of the moon. | |
398 | */ | |
399 | if (access_hook && run_access_hook(service, dir, path)) | |
400 | return -1; | |
401 | ||
02d57da4 LT |
402 | /* |
403 | * We'll ignore SIGTERM from now on, we have a | |
404 | * good client. | |
405 | */ | |
406 | signal(SIGTERM, SIG_IGN); | |
407 | ||
d819e4e6 JH |
408 | return service->fn(); |
409 | } | |
410 | ||
5d87dd4f JS |
411 | static void copy_to_log(int fd) |
412 | { | |
413 | struct strbuf line = STRBUF_INIT; | |
414 | FILE *fp; | |
415 | ||
416 | fp = fdopen(fd, "r"); | |
417 | if (fp == NULL) { | |
418 | logerror("fdopen of error channel failed"); | |
419 | close(fd); | |
420 | return; | |
421 | } | |
422 | ||
423 | while (strbuf_getline(&line, fp, '\n') != EOF) { | |
424 | logerror("%s", line.buf); | |
425 | strbuf_setlen(&line, 0); | |
426 | } | |
427 | ||
428 | strbuf_release(&line); | |
429 | fclose(fp); | |
430 | } | |
431 | ||
432 | static int run_service_command(const char **argv) | |
433 | { | |
d3180279 | 434 | struct child_process cld = CHILD_PROCESS_INIT; |
5d87dd4f | 435 | |
5d87dd4f JS |
436 | cld.argv = argv; |
437 | cld.git_cmd = 1; | |
438 | cld.err = -1; | |
439 | if (start_command(&cld)) | |
440 | return -1; | |
441 | ||
442 | close(0); | |
443 | close(1); | |
444 | ||
445 | copy_to_log(cld.err); | |
446 | ||
447 | return finish_command(&cld); | |
448 | } | |
449 | ||
d819e4e6 JH |
450 | static int upload_pack(void) |
451 | { | |
452 | /* Timeout as string */ | |
453 | char timeout_buf[64]; | |
66dbfd55 GV |
454 | const char *argv[] = { "upload-pack", "--strict", NULL, ".", NULL }; |
455 | ||
456 | argv[2] = timeout_buf; | |
d819e4e6 | 457 | |
960deccb | 458 | snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout); |
5d87dd4f | 459 | return run_service_command(argv); |
a87e8be2 LT |
460 | } |
461 | ||
39345a21 FBH |
462 | static int upload_archive(void) |
463 | { | |
5d87dd4f JS |
464 | static const char *argv[] = { "upload-archive", ".", NULL }; |
465 | return run_service_command(argv); | |
39345a21 FBH |
466 | } |
467 | ||
4b3b1e1e LT |
468 | static int receive_pack(void) |
469 | { | |
5d87dd4f JS |
470 | static const char *argv[] = { "receive-pack", ".", NULL }; |
471 | return run_service_command(argv); | |
4b3b1e1e LT |
472 | } |
473 | ||
d819e4e6 | 474 | static struct daemon_service daemon_service[] = { |
39345a21 | 475 | { "upload-archive", "uploadarch", upload_archive, 0, 1 }, |
d819e4e6 | 476 | { "upload-pack", "uploadpack", upload_pack, 1, 1 }, |
4b3b1e1e | 477 | { "receive-pack", "receivepack", receive_pack, 0, 1 }, |
d819e4e6 JH |
478 | }; |
479 | ||
f3fa1838 JH |
480 | static void enable_service(const char *name, int ena) |
481 | { | |
d819e4e6 JH |
482 | int i; |
483 | for (i = 0; i < ARRAY_SIZE(daemon_service); i++) { | |
484 | if (!strcmp(daemon_service[i].name, name)) { | |
485 | daemon_service[i].enabled = ena; | |
486 | return; | |
487 | } | |
488 | } | |
489 | die("No such service %s", name); | |
490 | } | |
491 | ||
f3fa1838 JH |
492 | static void make_service_overridable(const char *name, int ena) |
493 | { | |
d819e4e6 JH |
494 | int i; |
495 | for (i = 0; i < ARRAY_SIZE(daemon_service); i++) { | |
496 | if (!strcmp(daemon_service[i].name, name)) { | |
497 | daemon_service[i].overridable = ena; | |
498 | return; | |
499 | } | |
500 | } | |
501 | die("No such service %s", name); | |
502 | } | |
503 | ||
e8dbd76d IL |
504 | static void parse_host_and_port(char *hostport, char **host, |
505 | char **port) | |
506 | { | |
507 | if (*hostport == '[') { | |
508 | char *end; | |
509 | ||
510 | end = strchr(hostport, ']'); | |
511 | if (!end) | |
9517e6b8 | 512 | die("Invalid request ('[' without ']')"); |
e8dbd76d IL |
513 | *end = '\0'; |
514 | *host = hostport + 1; | |
515 | if (!end[1]) | |
516 | *port = NULL; | |
517 | else if (end[1] == ':') | |
518 | *port = end + 2; | |
519 | else | |
520 | die("Garbage after end of host part"); | |
521 | } else { | |
522 | *host = hostport; | |
523 | *port = strrchr(hostport, ':'); | |
524 | if (*port) { | |
e9bd3235 | 525 | **port = '\0'; |
e8dbd76d IL |
526 | ++*port; |
527 | } | |
528 | } | |
529 | } | |
530 | ||
b4853730 JK |
531 | /* |
532 | * Sanitize a string from the client so that it's OK to be inserted into a | |
533 | * filesystem path. Specifically, we disallow slashes, runs of "..", and | |
534 | * trailing and leading dots, which means that the client cannot escape | |
535 | * our base path via ".." traversal. | |
536 | */ | |
7a646cec | 537 | static void sanitize_client(struct strbuf *out, const char *in) |
b4853730 JK |
538 | { |
539 | for (; *in; in++) { | |
540 | if (*in == '/') | |
541 | continue; | |
542 | if (*in == '.' && (!out->len || out->buf[out->len - 1] == '.')) | |
543 | continue; | |
544 | strbuf_addch(out, *in); | |
545 | } | |
546 | ||
547 | while (out->len && out->buf[out->len - 1] == '.') | |
548 | strbuf_setlen(out, out->len - 1); | |
549 | } | |
550 | ||
b4853730 JK |
551 | /* |
552 | * Like sanitize_client, but we also perform any canonicalization | |
553 | * to make life easier on the admin. | |
554 | */ | |
7a646cec | 555 | static void canonicalize_client(struct strbuf *out, const char *in) |
b4853730 | 556 | { |
7a646cec RS |
557 | sanitize_client(out, in); |
558 | strbuf_tolower(out); | |
b4853730 JK |
559 | } |
560 | ||
eb30aed7 | 561 | /* |
73bb33a9 | 562 | * Read the host as supplied by the client connection. |
eb30aed7 | 563 | */ |
73bb33a9 | 564 | static void parse_host_arg(char *extra_args, int buflen) |
49ba83fb JL |
565 | { |
566 | char *val; | |
567 | int vallen; | |
568 | char *end = extra_args + buflen; | |
569 | ||
73bb33a9 | 570 | if (extra_args < end && *extra_args) { |
49ba83fb JL |
571 | saw_extended_args = 1; |
572 | if (strncasecmp("host=", extra_args, 5) == 0) { | |
573 | val = extra_args + 5; | |
574 | vallen = strlen(val) + 1; | |
575 | if (*val) { | |
eb30aed7 | 576 | /* Split <host>:<port> at colon. */ |
e8dbd76d IL |
577 | char *host; |
578 | char *port; | |
579 | parse_host_and_port(val, &host, &port); | |
dd467629 | 580 | if (port) { |
7a646cec RS |
581 | strbuf_reset(&tcp_port); |
582 | sanitize_client(&tcp_port, port); | |
dd467629 | 583 | } |
7a646cec RS |
584 | strbuf_reset(&hostname); |
585 | canonicalize_client(&hostname, host); | |
edef953e | 586 | hostname_lookup_done = 0; |
49ba83fb | 587 | } |
eb30aed7 | 588 | |
49ba83fb JL |
589 | /* On to the next one */ |
590 | extra_args = val + vallen; | |
591 | } | |
73bb33a9 SP |
592 | if (extra_args < end && *extra_args) |
593 | die("Invalid request"); | |
49ba83fb | 594 | } |
edef953e | 595 | } |
dd467629 | 596 | |
edef953e RS |
597 | /* |
598 | * Locate canonical hostname and its IP address. | |
599 | */ | |
600 | static void lookup_hostname(void) | |
601 | { | |
7a646cec | 602 | if (!hostname_lookup_done && hostname.len) { |
dd467629 | 603 | #ifndef NO_IPV6 |
dd467629 | 604 | struct addrinfo hints; |
3e8a00ae | 605 | struct addrinfo *ai; |
dd467629 JL |
606 | int gai; |
607 | static char addrbuf[HOST_NAME_MAX + 1]; | |
608 | ||
609 | memset(&hints, 0, sizeof(hints)); | |
610 | hints.ai_flags = AI_CANONNAME; | |
611 | ||
7a646cec | 612 | gai = getaddrinfo(hostname.buf, NULL, &hints, &ai); |
dd467629 | 613 | if (!gai) { |
3e8a00ae BK |
614 | struct sockaddr_in *sin_addr = (void *)ai->ai_addr; |
615 | ||
616 | inet_ntop(AF_INET, &sin_addr->sin_addr, | |
617 | addrbuf, sizeof(addrbuf)); | |
7a646cec RS |
618 | strbuf_reset(&ip_address); |
619 | strbuf_addstr(&ip_address, addrbuf); | |
3e8a00ae | 620 | |
7a646cec RS |
621 | strbuf_reset(&canon_hostname); |
622 | if (ai->ai_canonname) | |
623 | sanitize_client(&canon_hostname, | |
624 | ai->ai_canonname); | |
625 | else | |
626 | strbuf_addbuf(&canon_hostname, &ip_address); | |
3e8a00ae BK |
627 | |
628 | freeaddrinfo(ai); | |
dd467629 | 629 | } |
dd467629 | 630 | #else |
dd467629 JL |
631 | struct hostent *hent; |
632 | struct sockaddr_in sa; | |
633 | char **ap; | |
634 | static char addrbuf[HOST_NAME_MAX + 1]; | |
635 | ||
7a646cec | 636 | hent = gethostbyname(hostname.buf); |
eb6c4035 RS |
637 | if (hent) { |
638 | ap = hent->h_addr_list; | |
639 | memset(&sa, 0, sizeof sa); | |
640 | sa.sin_family = hent->h_addrtype; | |
641 | sa.sin_port = htons(0); | |
642 | memcpy(&sa.sin_addr, *ap, hent->h_length); | |
643 | ||
644 | inet_ntop(hent->h_addrtype, &sa.sin_addr, | |
645 | addrbuf, sizeof(addrbuf)); | |
dd467629 | 646 | |
7a646cec RS |
647 | strbuf_reset(&canon_hostname); |
648 | sanitize_client(&canon_hostname, hent->h_name); | |
649 | strbuf_reset(&ip_address); | |
650 | strbuf_addstr(&ip_address, addrbuf); | |
eb6c4035 | 651 | } |
dd467629 | 652 | #endif |
edef953e | 653 | hostname_lookup_done = 1; |
6720e95b | 654 | } |
dd467629 JL |
655 | } |
656 | ||
657 | ||
f9c87be6 | 658 | static int execute(void) |
a87e8be2 | 659 | { |
74543a04 | 660 | char *line = packet_buffer; |
d819e4e6 | 661 | int pktlen, len, i; |
f9c87be6 | 662 | char *addr = getenv("REMOTE_ADDR"), *port = getenv("REMOTE_PORT"); |
7d80694a | 663 | |
f9c87be6 EFL |
664 | if (addr) |
665 | loginfo("Connection from %s:%s", addr, port); | |
5b276ee4 | 666 | |
960deccb | 667 | alarm(init_timeout ? init_timeout : timeout); |
4981fe75 | 668 | pktlen = packet_read(0, NULL, NULL, packet_buffer, sizeof(packet_buffer), 0); |
960deccb | 669 | alarm(0); |
7d80694a | 670 | |
5ad312be JL |
671 | len = strlen(line); |
672 | if (pktlen != len) | |
673 | loginfo("Extended attributes (%d bytes) exist <%.*s>", | |
674 | (int) pktlen - len, | |
675 | (int) pktlen - len, line + len + 1); | |
83543a24 | 676 | if (len && line[len-1] == '\n') { |
7d80694a | 677 | line[--len] = 0; |
83543a24 JH |
678 | pktlen--; |
679 | } | |
7d80694a | 680 | |
7a646cec RS |
681 | strbuf_release(&hostname); |
682 | strbuf_release(&canon_hostname); | |
683 | strbuf_release(&ip_address); | |
684 | strbuf_release(&tcp_port); | |
eb30aed7 | 685 | |
d433ed0b | 686 | if (len != pktlen) |
73bb33a9 | 687 | parse_host_arg(line + len + 1, pktlen - len - 1); |
49ba83fb | 688 | |
d819e4e6 JH |
689 | for (i = 0; i < ARRAY_SIZE(daemon_service); i++) { |
690 | struct daemon_service *s = &(daemon_service[i]); | |
d12c24d2 JK |
691 | const char *arg; |
692 | ||
693 | if (skip_prefix(line, "git-", &arg) && | |
694 | skip_prefix(arg, s->name, &arg) && | |
695 | *arg++ == ' ') { | |
eb30aed7 JL |
696 | /* |
697 | * Note: The directory here is probably context sensitive, | |
698 | * and might depend on the actual service being performed. | |
699 | */ | |
d12c24d2 | 700 | return run_service(arg, s); |
49ba83fb | 701 | } |
d819e4e6 | 702 | } |
a87e8be2 | 703 | |
f8ff0c06 | 704 | logerror("Protocol error: '%s'", line); |
a87e8be2 LT |
705 | return -1; |
706 | } | |
707 | ||
15515b73 EFL |
708 | static int addrcmp(const struct sockaddr_storage *s1, |
709 | const struct sockaddr_storage *s2) | |
710 | { | |
3aff874a BC |
711 | const struct sockaddr *sa1 = (const struct sockaddr*) s1; |
712 | const struct sockaddr *sa2 = (const struct sockaddr*) s2; | |
713 | ||
714 | if (sa1->sa_family != sa2->sa_family) | |
715 | return sa1->sa_family - sa2->sa_family; | |
716 | if (sa1->sa_family == AF_INET) | |
15515b73 EFL |
717 | return memcmp(&((struct sockaddr_in *)s1)->sin_addr, |
718 | &((struct sockaddr_in *)s2)->sin_addr, | |
719 | sizeof(struct in_addr)); | |
720 | #ifndef NO_IPV6 | |
3aff874a | 721 | if (sa1->sa_family == AF_INET6) |
15515b73 EFL |
722 | return memcmp(&((struct sockaddr_in6 *)s1)->sin6_addr, |
723 | &((struct sockaddr_in6 *)s2)->sin6_addr, | |
724 | sizeof(struct in6_addr)); | |
725 | #endif | |
726 | return 0; | |
727 | } | |
728 | ||
3bd62c21 | 729 | static int max_connections = 32; |
66e631de | 730 | |
3bd62c21 | 731 | static unsigned int live_children; |
66e631de | 732 | |
4d8fa916 | 733 | static struct child { |
3bd62c21 | 734 | struct child *next; |
30e15602 | 735 | struct child_process cld; |
df076bdb | 736 | struct sockaddr_storage address; |
3bd62c21 | 737 | } *firstborn; |
66e631de | 738 | |
c295cf06 | 739 | static void add_child(struct child_process *cld, struct sockaddr *addr, socklen_t addrlen) |
66e631de | 740 | { |
460c2010 JH |
741 | struct child *newborn, **cradle; |
742 | ||
460c2010 JH |
743 | newborn = xcalloc(1, sizeof(*newborn)); |
744 | live_children++; | |
30e15602 | 745 | memcpy(&newborn->cld, cld, sizeof(*cld)); |
460c2010 JH |
746 | memcpy(&newborn->address, addr, addrlen); |
747 | for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next) | |
15515b73 | 748 | if (!addrcmp(&(*cradle)->address, &newborn->address)) |
460c2010 JH |
749 | break; |
750 | newborn->next = *cradle; | |
751 | *cradle = newborn; | |
66e631de LT |
752 | } |
753 | ||
66e631de LT |
754 | /* |
755 | * This gets called if the number of connections grows | |
756 | * past "max_connections". | |
757 | * | |
3bd62c21 | 758 | * We kill the newest connection from a duplicate IP. |
66e631de | 759 | */ |
3bd62c21 | 760 | static void kill_some_child(void) |
66e631de | 761 | { |
460c2010 | 762 | const struct child *blanket, *next; |
66e631de | 763 | |
460c2010 JH |
764 | if (!(blanket = firstborn)) |
765 | return; | |
695605b5 | 766 | |
460c2010 | 767 | for (; (next = blanket->next); blanket = next) |
15515b73 | 768 | if (!addrcmp(&blanket->address, &next->address)) { |
30e15602 | 769 | kill(blanket->cld.pid, SIGTERM); |
460c2010 JH |
770 | break; |
771 | } | |
a5a9126b JS |
772 | } |
773 | ||
3bd62c21 | 774 | static void check_dead_children(void) |
a87e8be2 | 775 | { |
3bd62c21 SB |
776 | int status; |
777 | pid_t pid; | |
02d57da4 | 778 | |
30e15602 EFL |
779 | struct child **cradle, *blanket; |
780 | for (cradle = &firstborn; (blanket = *cradle);) | |
781 | if ((pid = waitpid(blanket->cld.pid, &status, WNOHANG)) > 1) { | |
782 | const char *dead = ""; | |
783 | if (status) | |
784 | dead = " (with error)"; | |
785 | loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead); | |
786 | ||
787 | /* remove the child */ | |
788 | *cradle = blanket->next; | |
789 | live_children--; | |
790 | free(blanket); | |
791 | } else | |
792 | cradle = &blanket->next; | |
02d57da4 LT |
793 | } |
794 | ||
30e15602 | 795 | static char **cld_argv; |
c295cf06 | 796 | static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen) |
02d57da4 | 797 | { |
d3180279 | 798 | struct child_process cld = CHILD_PROCESS_INIT; |
f9c87be6 EFL |
799 | char addrbuf[300] = "REMOTE_ADDR=", portbuf[300]; |
800 | char *env[] = { addrbuf, portbuf, NULL }; | |
02d57da4 | 801 | |
3bd62c21 SB |
802 | if (max_connections && live_children >= max_connections) { |
803 | kill_some_child(); | |
460c2010 | 804 | sleep(1); /* give it some time to die */ |
3bd62c21 SB |
805 | check_dead_children(); |
806 | if (live_children >= max_connections) { | |
807 | close(incoming); | |
808 | logerror("Too many children, dropping connection"); | |
809 | return; | |
810 | } | |
811 | } | |
02d57da4 | 812 | |
f9c87be6 EFL |
813 | if (addr->sa_family == AF_INET) { |
814 | struct sockaddr_in *sin_addr = (void *) addr; | |
815 | inet_ntop(addr->sa_family, &sin_addr->sin_addr, addrbuf + 12, | |
816 | sizeof(addrbuf) - 12); | |
817 | snprintf(portbuf, sizeof(portbuf), "REMOTE_PORT=%d", | |
818 | ntohs(sin_addr->sin_port)); | |
819 | #ifndef NO_IPV6 | |
5d9cfa29 | 820 | } else if (addr->sa_family == AF_INET6) { |
f9c87be6 EFL |
821 | struct sockaddr_in6 *sin6_addr = (void *) addr; |
822 | ||
823 | char *buf = addrbuf + 12; | |
824 | *buf++ = '['; *buf = '\0'; /* stpcpy() is cool */ | |
825 | inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, | |
826 | sizeof(addrbuf) - 13); | |
827 | strcat(buf, "]"); | |
828 | ||
829 | snprintf(portbuf, sizeof(portbuf), "REMOTE_PORT=%d", | |
830 | ntohs(sin6_addr->sin6_port)); | |
831 | #endif | |
832 | } | |
833 | ||
834 | cld.env = (const char **)env; | |
30e15602 EFL |
835 | cld.argv = (const char **)cld_argv; |
836 | cld.in = incoming; | |
837 | cld.out = dup(incoming); | |
a87e8be2 | 838 | |
30e15602 EFL |
839 | if (start_command(&cld)) |
840 | logerror("unable to fork"); | |
841 | else | |
842 | add_child(&cld, addr, addrlen); | |
a87e8be2 LT |
843 | } |
844 | ||
eaa94919 LT |
845 | static void child_handler(int signo) |
846 | { | |
460c2010 JH |
847 | /* |
848 | * Otherwise empty handler because systemcalls will get interrupted | |
695605b5 SB |
849 | * upon signal receipt |
850 | * SysV needs the handler to be rearmed | |
851 | */ | |
bd7b371e | 852 | signal(SIGCHLD, child_handler); |
eaa94919 LT |
853 | } |
854 | ||
1955fabf MW |
855 | static int set_reuse_addr(int sockfd) |
856 | { | |
857 | int on = 1; | |
858 | ||
859 | if (!reuseaddr) | |
860 | return 0; | |
861 | return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, | |
862 | &on, sizeof(on)); | |
863 | } | |
864 | ||
2caa3215 AS |
865 | struct socketlist { |
866 | int *list; | |
867 | size_t nr; | |
868 | size_t alloc; | |
869 | }; | |
870 | ||
089d82e8 NTND |
871 | static const char *ip2str(int family, struct sockaddr *sin, socklen_t len) |
872 | { | |
873 | #ifdef NO_IPV6 | |
874 | static char ip[INET_ADDRSTRLEN]; | |
875 | #else | |
876 | static char ip[INET6_ADDRSTRLEN]; | |
877 | #endif | |
878 | ||
879 | switch (family) { | |
880 | #ifndef NO_IPV6 | |
881 | case AF_INET6: | |
882 | inet_ntop(family, &((struct sockaddr_in6*)sin)->sin6_addr, ip, len); | |
883 | break; | |
884 | #endif | |
885 | case AF_INET: | |
886 | inet_ntop(family, &((struct sockaddr_in*)sin)->sin_addr, ip, len); | |
887 | break; | |
888 | default: | |
889 | strcpy(ip, "<unknown>"); | |
890 | } | |
891 | return ip; | |
892 | } | |
893 | ||
6573faff PA |
894 | #ifndef NO_IPV6 |
895 | ||
2caa3215 | 896 | static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist) |
a87e8be2 | 897 | { |
2caa3215 | 898 | int socknum = 0; |
df076bdb | 899 | char pbuf[NI_MAXSERV]; |
6573faff PA |
900 | struct addrinfo hints, *ai0, *ai; |
901 | int gai; | |
20276889 | 902 | long flags; |
df076bdb | 903 | |
dd467629 | 904 | sprintf(pbuf, "%d", listen_port); |
df076bdb YH |
905 | memset(&hints, 0, sizeof(hints)); |
906 | hints.ai_family = AF_UNSPEC; | |
907 | hints.ai_socktype = SOCK_STREAM; | |
908 | hints.ai_protocol = IPPROTO_TCP; | |
909 | hints.ai_flags = AI_PASSIVE; | |
910 | ||
dd467629 | 911 | gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0); |
2caa3215 AS |
912 | if (gai) { |
913 | logerror("getaddrinfo() for %s failed: %s", listen_addr, gai_strerror(gai)); | |
914 | return 0; | |
915 | } | |
df076bdb | 916 | |
df076bdb YH |
917 | for (ai = ai0; ai; ai = ai->ai_next) { |
918 | int sockfd; | |
df076bdb YH |
919 | |
920 | sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); | |
921 | if (sockfd < 0) | |
922 | continue; | |
923 | if (sockfd >= FD_SETSIZE) { | |
df0daf8a | 924 | logerror("Socket descriptor too large"); |
df076bdb YH |
925 | close(sockfd); |
926 | continue; | |
927 | } | |
928 | ||
929 | #ifdef IPV6_V6ONLY | |
930 | if (ai->ai_family == AF_INET6) { | |
931 | int on = 1; | |
932 | setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY, | |
933 | &on, sizeof(on)); | |
934 | /* Note: error is not fatal */ | |
935 | } | |
936 | #endif | |
937 | ||
1955fabf | 938 | if (set_reuse_addr(sockfd)) { |
089d82e8 | 939 | logerror("Could not set SO_REUSEADDR: %s", strerror(errno)); |
1955fabf | 940 | close(sockfd); |
0032d548 | 941 | continue; |
1955fabf MW |
942 | } |
943 | ||
df076bdb | 944 | if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) { |
089d82e8 NTND |
945 | logerror("Could not bind to %s: %s", |
946 | ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen), | |
947 | strerror(errno)); | |
df076bdb YH |
948 | close(sockfd); |
949 | continue; /* not fatal */ | |
950 | } | |
951 | if (listen(sockfd, 5) < 0) { | |
089d82e8 NTND |
952 | logerror("Could not listen to %s: %s", |
953 | ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen), | |
954 | strerror(errno)); | |
df076bdb YH |
955 | close(sockfd); |
956 | continue; /* not fatal */ | |
957 | } | |
958 | ||
20276889 AJ |
959 | flags = fcntl(sockfd, F_GETFD, 0); |
960 | if (flags >= 0) | |
961 | fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC); | |
962 | ||
2caa3215 AS |
963 | ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc); |
964 | socklist->list[socklist->nr++] = sockfd; | |
965 | socknum++; | |
df076bdb YH |
966 | } |
967 | ||
968 | freeaddrinfo(ai0); | |
969 | ||
6573faff PA |
970 | return socknum; |
971 | } | |
972 | ||
973 | #else /* NO_IPV6 */ | |
974 | ||
2caa3215 | 975 | static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist) |
6573faff PA |
976 | { |
977 | struct sockaddr_in sin; | |
978 | int sockfd; | |
20276889 | 979 | long flags; |
6573faff | 980 | |
dd467629 JL |
981 | memset(&sin, 0, sizeof sin); |
982 | sin.sin_family = AF_INET; | |
983 | sin.sin_port = htons(listen_port); | |
984 | ||
985 | if (listen_addr) { | |
986 | /* Well, host better be an IP address here. */ | |
987 | if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0) | |
988 | return 0; | |
989 | } else { | |
990 | sin.sin_addr.s_addr = htonl(INADDR_ANY); | |
991 | } | |
992 | ||
6573faff PA |
993 | sockfd = socket(AF_INET, SOCK_STREAM, 0); |
994 | if (sockfd < 0) | |
995 | return 0; | |
996 | ||
1955fabf | 997 | if (set_reuse_addr(sockfd)) { |
089d82e8 | 998 | logerror("Could not set SO_REUSEADDR: %s", strerror(errno)); |
1955fabf MW |
999 | close(sockfd); |
1000 | return 0; | |
1001 | } | |
1002 | ||
6573faff | 1003 | if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) { |
9d1b9aa9 | 1004 | logerror("Could not bind to %s: %s", |
089d82e8 NTND |
1005 | ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)), |
1006 | strerror(errno)); | |
6573faff PA |
1007 | close(sockfd); |
1008 | return 0; | |
1009 | } | |
a87e8be2 | 1010 | |
f35230fb | 1011 | if (listen(sockfd, 5) < 0) { |
089d82e8 NTND |
1012 | logerror("Could not listen to %s: %s", |
1013 | ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)), | |
1014 | strerror(errno)); | |
f35230fb PS |
1015 | close(sockfd); |
1016 | return 0; | |
1017 | } | |
1018 | ||
20276889 AJ |
1019 | flags = fcntl(sockfd, F_GETFD, 0); |
1020 | if (flags >= 0) | |
1021 | fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC); | |
1022 | ||
2caa3215 AS |
1023 | ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc); |
1024 | socklist->list[socklist->nr++] = sockfd; | |
f35230fb | 1025 | return 1; |
6573faff PA |
1026 | } |
1027 | ||
1028 | #endif | |
1029 | ||
3a3a29c1 | 1030 | static void socksetup(struct string_list *listen_addr, int listen_port, struct socketlist *socklist) |
2caa3215 | 1031 | { |
3a3a29c1 AS |
1032 | if (!listen_addr->nr) |
1033 | setup_named_sock(NULL, listen_port, socklist); | |
1034 | else { | |
1035 | int i, socknum; | |
1036 | for (i = 0; i < listen_addr->nr; i++) { | |
1037 | socknum = setup_named_sock(listen_addr->items[i].string, | |
1038 | listen_port, socklist); | |
1039 | ||
1040 | if (socknum == 0) | |
1041 | logerror("unable to allocate any listen sockets for host %s on port %u", | |
1042 | listen_addr->items[i].string, listen_port); | |
1043 | } | |
1044 | } | |
2caa3215 AS |
1045 | } |
1046 | ||
1047 | static int service_loop(struct socketlist *socklist) | |
6573faff PA |
1048 | { |
1049 | struct pollfd *pfd; | |
1050 | int i; | |
1051 | ||
2caa3215 | 1052 | pfd = xcalloc(socklist->nr, sizeof(struct pollfd)); |
6573faff | 1053 | |
2caa3215 AS |
1054 | for (i = 0; i < socklist->nr; i++) { |
1055 | pfd[i].fd = socklist->list[i]; | |
6573faff PA |
1056 | pfd[i].events = POLLIN; |
1057 | } | |
9220282a PA |
1058 | |
1059 | signal(SIGCHLD, child_handler); | |
a87e8be2 LT |
1060 | |
1061 | for (;;) { | |
df076bdb | 1062 | int i; |
6573faff | 1063 | |
695605b5 SB |
1064 | check_dead_children(); |
1065 | ||
2caa3215 | 1066 | if (poll(pfd, socklist->nr, -1) < 0) { |
1eef0b33 | 1067 | if (errno != EINTR) { |
df0daf8a | 1068 | logerror("Poll failed, resuming: %s", |
1eef0b33 JH |
1069 | strerror(errno)); |
1070 | sleep(1); | |
1071 | } | |
df076bdb YH |
1072 | continue; |
1073 | } | |
1074 | ||
2caa3215 | 1075 | for (i = 0; i < socklist->nr; i++) { |
6573faff | 1076 | if (pfd[i].revents & POLLIN) { |
f9c87be6 EFL |
1077 | union { |
1078 | struct sockaddr sa; | |
1079 | struct sockaddr_in sai; | |
1080 | #ifndef NO_IPV6 | |
1081 | struct sockaddr_in6 sai6; | |
1082 | #endif | |
1083 | } ss; | |
c295cf06 | 1084 | socklen_t sslen = sizeof(ss); |
f9c87be6 | 1085 | int incoming = accept(pfd[i].fd, &ss.sa, &sslen); |
df076bdb YH |
1086 | if (incoming < 0) { |
1087 | switch (errno) { | |
1088 | case EAGAIN: | |
1089 | case EINTR: | |
1090 | case ECONNABORTED: | |
1091 | continue; | |
1092 | default: | |
d824cbba | 1093 | die_errno("accept returned"); |
df076bdb YH |
1094 | } |
1095 | } | |
f9c87be6 | 1096 | handle(incoming, &ss.sa, sslen); |
a87e8be2 LT |
1097 | } |
1098 | } | |
a87e8be2 LT |
1099 | } |
1100 | } | |
1101 | ||
a666b472 EFL |
1102 | #ifdef NO_POSIX_GOODIES |
1103 | ||
1104 | struct credentials; | |
1105 | ||
1106 | static void drop_privileges(struct credentials *cred) | |
1107 | { | |
1108 | /* nothing */ | |
1109 | } | |
1110 | ||
a666b472 EFL |
1111 | static struct credentials *prepare_credentials(const char *user_name, |
1112 | const char *group_name) | |
1113 | { | |
1114 | die("--user not supported on this platform"); | |
1115 | } | |
1116 | ||
1117 | #else | |
1118 | ||
1119 | struct credentials { | |
1120 | struct passwd *pass; | |
1121 | gid_t gid; | |
1122 | }; | |
1123 | ||
1124 | static void drop_privileges(struct credentials *cred) | |
1125 | { | |
1126 | if (cred && (initgroups(cred->pass->pw_name, cred->gid) || | |
1127 | setgid (cred->gid) || setuid(cred->pass->pw_uid))) | |
1128 | die("cannot drop privileges"); | |
1129 | } | |
1130 | ||
1131 | static struct credentials *prepare_credentials(const char *user_name, | |
1132 | const char *group_name) | |
1133 | { | |
1134 | static struct credentials c; | |
1135 | ||
1136 | c.pass = getpwnam(user_name); | |
1137 | if (!c.pass) | |
1138 | die("user not found - %s", user_name); | |
1139 | ||
1140 | if (!group_name) | |
1141 | c.gid = c.pass->pw_gid; | |
1142 | else { | |
1143 | struct group *group = getgrnam(group_name); | |
1144 | if (!group) | |
1145 | die("group not found - %s", group_name); | |
1146 | ||
1147 | c.gid = group->gr_gid; | |
1148 | } | |
1149 | ||
1150 | return &c; | |
1151 | } | |
a666b472 | 1152 | #endif |
a5262768 | 1153 | |
45ed5d7f ML |
1154 | static void store_pid(const char *path) |
1155 | { | |
1156 | FILE *f = fopen(path, "w"); | |
1157 | if (!f) | |
d824cbba | 1158 | die_errno("cannot open pid file '%s'", path); |
85e72830 | 1159 | if (fprintf(f, "%"PRIuMAX"\n", (uintmax_t) getpid()) < 0 || fclose(f) != 0) |
d824cbba | 1160 | die_errno("failed to write pid file '%s'", path); |
45ed5d7f ML |
1161 | } |
1162 | ||
a666b472 EFL |
1163 | static int serve(struct string_list *listen_addr, int listen_port, |
1164 | struct credentials *cred) | |
6573faff | 1165 | { |
2caa3215 | 1166 | struct socketlist socklist = { NULL, 0, 0 }; |
4ae22d96 | 1167 | |
2caa3215 AS |
1168 | socksetup(listen_addr, listen_port, &socklist); |
1169 | if (socklist.nr == 0) | |
3a3a29c1 AS |
1170 | die("unable to allocate any listen sockets on port %u", |
1171 | listen_port); | |
4ae22d96 | 1172 | |
a666b472 | 1173 | drop_privileges(cred); |
678dac6b | 1174 | |
f6a34cfb CB |
1175 | loginfo("Ready to rumble"); |
1176 | ||
2caa3215 | 1177 | return service_loop(&socklist); |
4ae22d96 | 1178 | } |
6573faff | 1179 | |
a87e8be2 LT |
1180 | int main(int argc, char **argv) |
1181 | { | |
dd467629 | 1182 | int listen_port = 0; |
3a3a29c1 | 1183 | struct string_list listen_addr = STRING_LIST_INIT_NODUP; |
30e15602 | 1184 | int serve_mode = 0, inetd_mode = 0; |
678dac6b | 1185 | const char *pid_file = NULL, *user_name = NULL, *group_name = NULL; |
a5262768 | 1186 | int detach = 0; |
a666b472 | 1187 | struct credentials *cred = NULL; |
a87e8be2 LT |
1188 | int i; |
1189 | ||
5e9637c6 ÆAB |
1190 | git_setup_gettext(); |
1191 | ||
2fb3f6db SP |
1192 | git_extract_argv0_path(argv[0]); |
1193 | ||
a87e8be2 LT |
1194 | for (i = 1; i < argc; i++) { |
1195 | char *arg = argv[i]; | |
ae021d87 | 1196 | const char *v; |
a87e8be2 | 1197 | |
ae021d87 JK |
1198 | if (skip_prefix(arg, "--listen=", &v)) { |
1199 | string_list_append(&listen_addr, xstrdup_tolower(v)); | |
6720e95b | 1200 | continue; |
dd467629 | 1201 | } |
ae021d87 | 1202 | if (skip_prefix(arg, "--port=", &v)) { |
a87e8be2 LT |
1203 | char *end; |
1204 | unsigned long n; | |
ae021d87 JK |
1205 | n = strtoul(v, &end, 0); |
1206 | if (*v && !*end) { | |
dd467629 | 1207 | listen_port = n; |
a87e8be2 LT |
1208 | continue; |
1209 | } | |
1210 | } | |
30e15602 EFL |
1211 | if (!strcmp(arg, "--serve")) { |
1212 | serve_mode = 1; | |
1213 | continue; | |
1214 | } | |
e64e1b79 LT |
1215 | if (!strcmp(arg, "--inetd")) { |
1216 | inetd_mode = 1; | |
a8883288 | 1217 | log_syslog = 1; |
e64e1b79 LT |
1218 | continue; |
1219 | } | |
f8ff0c06 PB |
1220 | if (!strcmp(arg, "--verbose")) { |
1221 | verbose = 1; | |
1222 | continue; | |
1223 | } | |
9048fe1c PB |
1224 | if (!strcmp(arg, "--syslog")) { |
1225 | log_syslog = 1; | |
9048fe1c PB |
1226 | continue; |
1227 | } | |
4ae95682 PA |
1228 | if (!strcmp(arg, "--export-all")) { |
1229 | export_all_trees = 1; | |
1230 | continue; | |
1231 | } | |
ae021d87 JK |
1232 | if (skip_prefix(arg, "--access-hook=", &v)) { |
1233 | access_hook = v; | |
93741e4a JH |
1234 | continue; |
1235 | } | |
ae021d87 JK |
1236 | if (skip_prefix(arg, "--timeout=", &v)) { |
1237 | timeout = atoi(v); | |
a8883288 | 1238 | continue; |
960deccb | 1239 | } |
ae021d87 JK |
1240 | if (skip_prefix(arg, "--init-timeout=", &v)) { |
1241 | init_timeout = atoi(v); | |
a8883288 | 1242 | continue; |
960deccb | 1243 | } |
ae021d87 JK |
1244 | if (skip_prefix(arg, "--max-connections=", &v)) { |
1245 | max_connections = atoi(v); | |
3bd62c21 SB |
1246 | if (max_connections < 0) |
1247 | max_connections = 0; /* unlimited */ | |
1248 | continue; | |
1249 | } | |
4dbd1352 AE |
1250 | if (!strcmp(arg, "--strict-paths")) { |
1251 | strict_paths = 1; | |
1252 | continue; | |
1253 | } | |
ae021d87 JK |
1254 | if (skip_prefix(arg, "--base-path=", &v)) { |
1255 | base_path = v; | |
b21c31c9 PB |
1256 | continue; |
1257 | } | |
73a7a656 JA |
1258 | if (!strcmp(arg, "--base-path-relaxed")) { |
1259 | base_path_relaxed = 1; | |
1260 | continue; | |
1261 | } | |
ae021d87 JK |
1262 | if (skip_prefix(arg, "--interpolated-path=", &v)) { |
1263 | interpolated_path = v; | |
49ba83fb JL |
1264 | continue; |
1265 | } | |
1955fabf MW |
1266 | if (!strcmp(arg, "--reuseaddr")) { |
1267 | reuseaddr = 1; | |
1268 | continue; | |
1269 | } | |
603968d2 JH |
1270 | if (!strcmp(arg, "--user-path")) { |
1271 | user_path = ""; | |
1272 | continue; | |
1273 | } | |
ae021d87 JK |
1274 | if (skip_prefix(arg, "--user-path=", &v)) { |
1275 | user_path = v; | |
603968d2 JH |
1276 | continue; |
1277 | } | |
ae021d87 JK |
1278 | if (skip_prefix(arg, "--pid-file=", &v)) { |
1279 | pid_file = v; | |
45ed5d7f ML |
1280 | continue; |
1281 | } | |
a5262768 ML |
1282 | if (!strcmp(arg, "--detach")) { |
1283 | detach = 1; | |
1284 | log_syslog = 1; | |
1285 | continue; | |
1286 | } | |
ae021d87 JK |
1287 | if (skip_prefix(arg, "--user=", &v)) { |
1288 | user_name = v; | |
678dac6b TS |
1289 | continue; |
1290 | } | |
ae021d87 JK |
1291 | if (skip_prefix(arg, "--group=", &v)) { |
1292 | group_name = v; | |
678dac6b TS |
1293 | continue; |
1294 | } | |
ae021d87 JK |
1295 | if (skip_prefix(arg, "--enable=", &v)) { |
1296 | enable_service(v, 1); | |
d819e4e6 JH |
1297 | continue; |
1298 | } | |
ae021d87 JK |
1299 | if (skip_prefix(arg, "--disable=", &v)) { |
1300 | enable_service(v, 0); | |
d819e4e6 JH |
1301 | continue; |
1302 | } | |
ae021d87 JK |
1303 | if (skip_prefix(arg, "--allow-override=", &v)) { |
1304 | make_service_overridable(v, 1); | |
d819e4e6 JH |
1305 | continue; |
1306 | } | |
ae021d87 JK |
1307 | if (skip_prefix(arg, "--forbid-override=", &v)) { |
1308 | make_service_overridable(v, 0); | |
d819e4e6 JH |
1309 | continue; |
1310 | } | |
82246b76 | 1311 | if (!strcmp(arg, "--informative-errors")) { |
d5570f4d JK |
1312 | informative_errors = 1; |
1313 | continue; | |
1314 | } | |
82246b76 | 1315 | if (!strcmp(arg, "--no-informative-errors")) { |
d5570f4d JK |
1316 | informative_errors = 0; |
1317 | continue; | |
1318 | } | |
4ae95682 PA |
1319 | if (!strcmp(arg, "--")) { |
1320 | ok_paths = &argv[i+1]; | |
1321 | break; | |
1322 | } else if (arg[0] != '-') { | |
1323 | ok_paths = &argv[i]; | |
1324 | break; | |
1325 | } | |
e64e1b79 | 1326 | |
a87e8be2 LT |
1327 | usage(daemon_usage); |
1328 | } | |
1329 | ||
22665bba | 1330 | if (log_syslog) { |
6a992e9e | 1331 | openlog("git-daemon", LOG_PID, LOG_DAEMON); |
22665bba | 1332 | set_die_routine(daemon_die); |
460c2010 | 1333 | } else |
48196afd | 1334 | /* avoid splitting a message in the middle */ |
48cfaea1 | 1335 | setvbuf(stderr, NULL, _IOFBF, 4096); |
22665bba | 1336 | |
9cddf56e EFL |
1337 | if (inetd_mode && (detach || group_name || user_name)) |
1338 | die("--detach, --user and --group are incompatible with --inetd"); | |
678dac6b | 1339 | |
3a3a29c1 | 1340 | if (inetd_mode && (listen_port || (listen_addr.nr > 0))) |
dd467629 JL |
1341 | die("--listen= and --port= are incompatible with --inetd"); |
1342 | else if (listen_port == 0) | |
1343 | listen_port = DEFAULT_GIT_PORT; | |
1344 | ||
678dac6b TS |
1345 | if (group_name && !user_name) |
1346 | die("--group supplied without --user"); | |
1347 | ||
a666b472 EFL |
1348 | if (user_name) |
1349 | cred = prepare_credentials(user_name, group_name); | |
678dac6b | 1350 | |
ad8b4f56 ML |
1351 | if (strict_paths && (!ok_paths || !*ok_paths)) |
1352 | die("option --strict-paths requires a whitelist"); | |
1353 | ||
90b4a71c JH |
1354 | if (base_path && !is_directory(base_path)) |
1355 | die("base-path '%s' does not exist or is not a directory", | |
1356 | base_path); | |
20632071 | 1357 | |
7c3693f1 | 1358 | if (inetd_mode) { |
30e15602 EFL |
1359 | if (!freopen("/dev/null", "w", stderr)) |
1360 | die_errno("failed to redirect stderr to /dev/null"); | |
1361 | } | |
1362 | ||
f9c87be6 EFL |
1363 | if (inetd_mode || serve_mode) |
1364 | return execute(); | |
bce8230d | 1365 | |
de0957ce NTND |
1366 | if (detach) { |
1367 | if (daemonize()) | |
1368 | die("--detach not supported on this platform"); | |
1369 | } else | |
a5262768 | 1370 | sanitize_stdfds(); |
258e93a1 | 1371 | |
45ed5d7f ML |
1372 | if (pid_file) |
1373 | store_pid(pid_file); | |
1374 | ||
30e15602 EFL |
1375 | /* prepare argv for serving-processes */ |
1376 | cld_argv = xmalloc(sizeof (char *) * (argc + 2)); | |
081f84ee JN |
1377 | cld_argv[0] = argv[0]; /* git-daemon */ |
1378 | cld_argv[1] = "--serve"; | |
1379 | for (i = 1; i < argc; ++i) | |
1380 | cld_argv[i+1] = argv[i]; | |
30e15602 EFL |
1381 | cld_argv[argc+1] = NULL; |
1382 | ||
a666b472 | 1383 | return serve(&listen_addr, listen_port, cred); |
a87e8be2 | 1384 | } |