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Commit | Line | Data |
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979e32fa | 1 | #include "cache.h" |
85023577 | 2 | #include "pkt-line.h" |
5d87dd4f JS |
3 | #include "run-command.h" |
4 | #include "strbuf.h" | |
3a3a29c1 | 5 | #include "string-list.h" |
f8ff0c06 | 6 | |
695dffe2 JS |
7 | #ifndef HOST_NAME_MAX |
8 | #define HOST_NAME_MAX 256 | |
9 | #endif | |
10 | ||
2844923d MD |
11 | #ifdef NO_INITGROUPS |
12 | #define initgroups(x, y) (0) /* nothing */ | |
13 | #endif | |
14 | ||
9048fe1c | 15 | static int log_syslog; |
f8ff0c06 | 16 | static int verbose; |
1955fabf | 17 | static int reuseaddr; |
d5570f4d | 18 | static int informative_errors; |
f8ff0c06 | 19 | |
960deccb | 20 | static const char daemon_usage[] = |
1b1dd23f | 21 | "git daemon [--verbose] [--syslog] [--export-all]\n" |
62b4698e ŠN |
22 | " [--timeout=<n>] [--init-timeout=<n>] [--max-connections=<n>]\n" |
23 | " [--strict-paths] [--base-path=<path>] [--base-path-relaxed]\n" | |
24 | " [--user-path | --user-path=<path>]\n" | |
25 | " [--interpolated-path=<path>]\n" | |
9cddf56e | 26 | " [--reuseaddr] [--pid-file=<file>]\n" |
62b4698e | 27 | " [--(enable|disable|allow-override|forbid-override)=<service>]\n" |
93741e4a | 28 | " [--access-hook=<path>]\n" |
62b4698e | 29 | " [--inetd | [--listen=<host_or_ipaddr>] [--port=<n>]\n" |
9cddf56e | 30 | " [--detach] [--user=<user> [--group=<group>]]\n" |
62b4698e | 31 | " [<directory>...]"; |
4ae95682 PA |
32 | |
33 | /* List of acceptable pathname prefixes */ | |
3f2e2297 | 34 | static const char **ok_paths; |
96f1e58f | 35 | static int strict_paths; |
4ae95682 PA |
36 | |
37 | /* If this is set, git-daemon-export-ok is not required */ | |
96f1e58f | 38 | static int export_all_trees; |
f8ff0c06 | 39 | |
b21c31c9 | 40 | /* Take all paths relative to this one if non-NULL */ |
1055a890 JK |
41 | static const char *base_path; |
42 | static const char *interpolated_path; | |
73a7a656 | 43 | static int base_path_relaxed; |
49ba83fb | 44 | |
603968d2 JH |
45 | /* If defined, ~user notation is allowed and the string is inserted |
46 | * after ~user/. E.g. a request to git://host/~alice/frotz would | |
47 | * go to /home/alice/pub_git/frotz with --user-path=pub_git. | |
48 | */ | |
96f1e58f | 49 | static const char *user_path; |
603968d2 | 50 | |
960deccb | 51 | /* Timeout, and initial timeout */ |
96f1e58f DR |
52 | static unsigned int timeout; |
53 | static unsigned int init_timeout; | |
f8ff0c06 | 54 | |
01cec54e RS |
55 | struct hostinfo { |
56 | struct strbuf hostname; | |
57 | struct strbuf canon_hostname; | |
58 | struct strbuf ip_address; | |
59 | struct strbuf tcp_port; | |
60 | unsigned int hostname_lookup_done:1; | |
61 | unsigned int saw_extended_args:1; | |
62 | }; | |
edef953e | 63 | |
01cec54e | 64 | static void lookup_hostname(struct hostinfo *hi); |
edef953e | 65 | |
01cec54e | 66 | static const char *get_canon_hostname(struct hostinfo *hi) |
edef953e | 67 | { |
01cec54e RS |
68 | lookup_hostname(hi); |
69 | return hi->canon_hostname.buf; | |
edef953e RS |
70 | } |
71 | ||
01cec54e | 72 | static const char *get_ip_address(struct hostinfo *hi) |
edef953e | 73 | { |
01cec54e RS |
74 | lookup_hostname(hi); |
75 | return hi->ip_address.buf; | |
edef953e RS |
76 | } |
77 | ||
9048fe1c | 78 | static void logreport(int priority, const char *err, va_list params) |
f8ff0c06 | 79 | { |
9048fe1c | 80 | if (log_syslog) { |
6a992e9e SB |
81 | char buf[1024]; |
82 | vsnprintf(buf, sizeof(buf), err, params); | |
9048fe1c | 83 | syslog(priority, "%s", buf); |
460c2010 JH |
84 | } else { |
85 | /* | |
48cfaea1 | 86 | * Since stderr is set to buffered mode, the |
6a992e9e | 87 | * logging of different processes will not overlap |
48cfaea1 | 88 | * unless they overflow the (rather big) buffers. |
6a992e9e | 89 | */ |
85e72830 | 90 | fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid()); |
6a992e9e SB |
91 | vfprintf(stderr, err, params); |
92 | fputc('\n', stderr); | |
48cfaea1 | 93 | fflush(stderr); |
6a992e9e | 94 | } |
f8ff0c06 PB |
95 | } |
96 | ||
28bea9e5 | 97 | __attribute__((format (printf, 1, 2))) |
cdda4745 | 98 | static void logerror(const char *err, ...) |
f8ff0c06 PB |
99 | { |
100 | va_list params; | |
101 | va_start(params, err); | |
9048fe1c | 102 | logreport(LOG_ERR, err, params); |
f8ff0c06 PB |
103 | va_end(params); |
104 | } | |
105 | ||
28bea9e5 | 106 | __attribute__((format (printf, 1, 2))) |
cdda4745 | 107 | static void loginfo(const char *err, ...) |
f8ff0c06 PB |
108 | { |
109 | va_list params; | |
110 | if (!verbose) | |
111 | return; | |
112 | va_start(params, err); | |
9048fe1c | 113 | logreport(LOG_INFO, err, params); |
f8ff0c06 PB |
114 | va_end(params); |
115 | } | |
a87e8be2 | 116 | |
ad8b4f56 ML |
117 | static void NORETURN daemon_die(const char *err, va_list params) |
118 | { | |
119 | logreport(LOG_ERR, err, params); | |
120 | exit(1); | |
121 | } | |
122 | ||
dc8edc8f RS |
123 | struct expand_path_context { |
124 | const char *directory; | |
01cec54e | 125 | struct hostinfo *hostinfo; |
dc8edc8f RS |
126 | }; |
127 | ||
128 | static size_t expand_path(struct strbuf *sb, const char *placeholder, void *ctx) | |
129 | { | |
130 | struct expand_path_context *context = ctx; | |
01cec54e | 131 | struct hostinfo *hi = context->hostinfo; |
dc8edc8f RS |
132 | |
133 | switch (placeholder[0]) { | |
134 | case 'H': | |
01cec54e | 135 | strbuf_addbuf(sb, &hi->hostname); |
dc8edc8f RS |
136 | return 1; |
137 | case 'C': | |
138 | if (placeholder[1] == 'H') { | |
01cec54e | 139 | strbuf_addstr(sb, get_canon_hostname(hi)); |
dc8edc8f RS |
140 | return 2; |
141 | } | |
142 | break; | |
143 | case 'I': | |
144 | if (placeholder[1] == 'P') { | |
01cec54e | 145 | strbuf_addstr(sb, get_ip_address(hi)); |
dc8edc8f RS |
146 | return 2; |
147 | } | |
148 | break; | |
149 | case 'P': | |
01cec54e | 150 | strbuf_addbuf(sb, &hi->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 | ||
01cec54e | 159 | static const char *path_ok(const char *directory, struct hostinfo *hi) |
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 | } | |
01cec54e | 195 | else if (interpolated_path && hi->saw_extended_args) { |
9d7ca667 | 196 | struct strbuf expanded_path = STRBUF_INIT; |
dc8edc8f RS |
197 | struct expand_path_context context; |
198 | ||
199 | context.directory = directory; | |
01cec54e | 200 | context.hostinfo = hi; |
dc8edc8f | 201 | |
49ba83fb JL |
202 | if (*dir != '/') { |
203 | /* Allow only absolute */ | |
204 | logerror("'%s': Non-absolute path denied (interpolated-path active)", dir); | |
205 | return NULL; | |
206 | } | |
207 | ||
9d7ca667 | 208 | strbuf_expand(&expanded_path, interpolated_path, |
dc8edc8f | 209 | expand_path, &context); |
9d7ca667 RS |
210 | strlcpy(interp_path, expanded_path.buf, PATH_MAX); |
211 | strbuf_release(&expanded_path); | |
49ba83fb JL |
212 | loginfo("Interpolated dir '%s'", interp_path); |
213 | ||
214 | dir = interp_path; | |
215 | } | |
603968d2 JH |
216 | else if (base_path) { |
217 | if (*dir != '/') { | |
218 | /* Allow only absolute */ | |
1fda3d55 | 219 | logerror("'%s': Non-absolute path denied (base-path active)", dir); |
b21c31c9 PB |
220 | return NULL; |
221 | } | |
49ba83fb JL |
222 | snprintf(rpath, PATH_MAX, "%s%s", base_path, dir); |
223 | dir = rpath; | |
b21c31c9 PB |
224 | } |
225 | ||
a583971f RS |
226 | path = enter_repo(dir, strict_paths); |
227 | if (!path && base_path && base_path_relaxed) { | |
73a7a656 JA |
228 | /* |
229 | * if we fail and base_path_relaxed is enabled, try without | |
230 | * prefixing the base path | |
231 | */ | |
a583971f RS |
232 | dir = directory; |
233 | path = enter_repo(dir, strict_paths); | |
234 | } | |
3e04c62d | 235 | |
4dbd1352 | 236 | if (!path) { |
05ac6b34 | 237 | logerror("'%s' does not appear to be a git repository", dir); |
4dbd1352 | 238 | return NULL; |
4ae95682 PA |
239 | } |
240 | ||
241 | if ( ok_paths && *ok_paths ) { | |
3f2e2297 | 242 | const char **pp; |
4dbd1352 | 243 | int pathlen = strlen(path); |
4ae95682 | 244 | |
ce335fe0 | 245 | /* The validation is done on the paths after enter_repo |
a6080a0a | 246 | * appends optional {.git,.git/.git} and friends, but |
d79374c7 JH |
247 | * it does not use getcwd(). So if your /pub is |
248 | * a symlink to /mnt/pub, you can whitelist /pub and | |
249 | * do not have to say /mnt/pub. | |
250 | * Do not say /pub/. | |
ce335fe0 | 251 | */ |
4ae95682 PA |
252 | for ( pp = ok_paths ; *pp ; pp++ ) { |
253 | int len = strlen(*pp); | |
ce335fe0 JH |
254 | if (len <= pathlen && |
255 | !memcmp(*pp, path, len) && | |
256 | (path[len] == '\0' || | |
257 | (!strict_paths && path[len] == '/'))) | |
258 | return path; | |
4ae95682 | 259 | } |
4dbd1352 AE |
260 | } |
261 | else { | |
262 | /* be backwards compatible */ | |
263 | if (!strict_paths) | |
264 | return path; | |
4ae95682 PA |
265 | } |
266 | ||
4dbd1352 AE |
267 | logerror("'%s': not in whitelist", path); |
268 | return NULL; /* Fallthrough. Deny by default */ | |
4ae95682 | 269 | } |
a87e8be2 | 270 | |
d819e4e6 JH |
271 | typedef int (*daemon_service_fn)(void); |
272 | struct daemon_service { | |
273 | const char *name; | |
274 | const char *config_name; | |
275 | daemon_service_fn fn; | |
276 | int enabled; | |
277 | int overridable; | |
278 | }; | |
279 | ||
d5570f4d JK |
280 | static int daemon_error(const char *dir, const char *msg) |
281 | { | |
282 | if (!informative_errors) | |
283 | msg = "access denied or repository not exported"; | |
284 | packet_write(1, "ERR %s: %s", msg, dir); | |
285 | return -1; | |
286 | } | |
287 | ||
1055a890 | 288 | static const char *access_hook; |
93741e4a | 289 | |
01cec54e RS |
290 | static int run_access_hook(struct daemon_service *service, const char *dir, |
291 | const char *path, struct hostinfo *hi) | |
93741e4a | 292 | { |
d3180279 | 293 | struct child_process child = CHILD_PROCESS_INIT; |
93741e4a JH |
294 | struct strbuf buf = STRBUF_INIT; |
295 | const char *argv[8]; | |
296 | const char **arg = argv; | |
297 | char *eol; | |
298 | int seen_errors = 0; | |
299 | ||
93741e4a JH |
300 | *arg++ = access_hook; |
301 | *arg++ = service->name; | |
302 | *arg++ = path; | |
01cec54e RS |
303 | *arg++ = hi->hostname.buf; |
304 | *arg++ = get_canon_hostname(hi); | |
305 | *arg++ = get_ip_address(hi); | |
306 | *arg++ = hi->tcp_port.buf; | |
93741e4a | 307 | *arg = NULL; |
93741e4a | 308 | |
93741e4a JH |
309 | child.use_shell = 1; |
310 | child.argv = argv; | |
311 | child.no_stdin = 1; | |
312 | child.no_stderr = 1; | |
313 | child.out = -1; | |
314 | if (start_command(&child)) { | |
315 | logerror("daemon access hook '%s' failed to start", | |
316 | access_hook); | |
317 | goto error_return; | |
318 | } | |
319 | if (strbuf_read(&buf, child.out, 0) < 0) { | |
320 | logerror("failed to read from pipe to daemon access hook '%s'", | |
321 | access_hook); | |
322 | strbuf_reset(&buf); | |
323 | seen_errors = 1; | |
324 | } | |
325 | if (close(child.out) < 0) { | |
326 | logerror("failed to close pipe to daemon access hook '%s'", | |
327 | access_hook); | |
328 | seen_errors = 1; | |
329 | } | |
330 | if (finish_command(&child)) | |
331 | seen_errors = 1; | |
332 | ||
333 | if (!seen_errors) { | |
334 | strbuf_release(&buf); | |
335 | return 0; | |
336 | } | |
337 | ||
338 | error_return: | |
339 | strbuf_ltrim(&buf); | |
340 | if (!buf.len) | |
341 | strbuf_addstr(&buf, "service rejected"); | |
342 | eol = strchr(buf.buf, '\n'); | |
343 | if (eol) | |
344 | *eol = '\0'; | |
345 | errno = EACCES; | |
346 | daemon_error(dir, buf.buf); | |
347 | strbuf_release(&buf); | |
348 | return -1; | |
349 | } | |
350 | ||
01cec54e RS |
351 | static int run_service(const char *dir, struct daemon_service *service, |
352 | struct hostinfo *hi) | |
a87e8be2 | 353 | { |
4dbd1352 | 354 | const char *path; |
d819e4e6 | 355 | int enabled = service->enabled; |
8939d32d | 356 | struct strbuf var = STRBUF_INIT; |
d819e4e6 | 357 | |
a47551c3 | 358 | loginfo("Request %s for '%s'", service->name, dir); |
4dbd1352 | 359 | |
d819e4e6 JH |
360 | if (!enabled && !service->overridable) { |
361 | logerror("'%s': service not enabled.", service->name); | |
362 | errno = EACCES; | |
d5570f4d | 363 | return daemon_error(dir, "service not enabled"); |
d819e4e6 | 364 | } |
4ae95682 | 365 | |
01cec54e | 366 | if (!(path = path_ok(dir, hi))) |
d5570f4d | 367 | return daemon_error(dir, "no such repository"); |
47888f0f | 368 | |
a87e8be2 LT |
369 | /* |
370 | * Security on the cheap. | |
371 | * | |
a935c397 | 372 | * We want a readable HEAD, usable "objects" directory, and |
a87e8be2 LT |
373 | * a "git-daemon-export-ok" flag that says that the other side |
374 | * is ok with us doing this. | |
4dbd1352 AE |
375 | * |
376 | * path_ok() uses enter_repo() and does whitelist checking. | |
377 | * We only need to make sure the repository is exported. | |
a87e8be2 | 378 | */ |
4dbd1352 | 379 | |
3e04c62d | 380 | if (!export_all_trees && access("git-daemon-export-ok", F_OK)) { |
4dbd1352 | 381 | logerror("'%s': repository not exported.", path); |
3e04c62d | 382 | errno = EACCES; |
d5570f4d | 383 | return daemon_error(dir, "repository not exported"); |
3e04c62d PA |
384 | } |
385 | ||
d819e4e6 | 386 | if (service->overridable) { |
8939d32d TA |
387 | strbuf_addf(&var, "daemon.%s", service->config_name); |
388 | git_config_get_bool(var.buf, &enabled); | |
389 | strbuf_release(&var); | |
d819e4e6 JH |
390 | } |
391 | if (!enabled) { | |
392 | logerror("'%s': service not enabled for '%s'", | |
393 | service->name, path); | |
394 | errno = EACCES; | |
d5570f4d | 395 | return daemon_error(dir, "service not enabled"); |
d819e4e6 JH |
396 | } |
397 | ||
93741e4a JH |
398 | /* |
399 | * Optionally, a hook can choose to deny access to the | |
400 | * repository depending on the phase of the moon. | |
401 | */ | |
01cec54e | 402 | if (access_hook && run_access_hook(service, dir, path, hi)) |
93741e4a JH |
403 | return -1; |
404 | ||
02d57da4 LT |
405 | /* |
406 | * We'll ignore SIGTERM from now on, we have a | |
407 | * good client. | |
408 | */ | |
409 | signal(SIGTERM, SIG_IGN); | |
410 | ||
d819e4e6 JH |
411 | return service->fn(); |
412 | } | |
413 | ||
5d87dd4f JS |
414 | static void copy_to_log(int fd) |
415 | { | |
416 | struct strbuf line = STRBUF_INIT; | |
417 | FILE *fp; | |
418 | ||
419 | fp = fdopen(fd, "r"); | |
420 | if (fp == NULL) { | |
421 | logerror("fdopen of error channel failed"); | |
422 | close(fd); | |
423 | return; | |
424 | } | |
425 | ||
8f309aeb | 426 | while (strbuf_getline_lf(&line, fp) != EOF) { |
5d87dd4f JS |
427 | logerror("%s", line.buf); |
428 | strbuf_setlen(&line, 0); | |
429 | } | |
430 | ||
431 | strbuf_release(&line); | |
432 | fclose(fp); | |
433 | } | |
434 | ||
435 | static int run_service_command(const char **argv) | |
436 | { | |
d3180279 | 437 | struct child_process cld = CHILD_PROCESS_INIT; |
5d87dd4f | 438 | |
5d87dd4f JS |
439 | cld.argv = argv; |
440 | cld.git_cmd = 1; | |
441 | cld.err = -1; | |
442 | if (start_command(&cld)) | |
443 | return -1; | |
444 | ||
445 | close(0); | |
446 | close(1); | |
447 | ||
448 | copy_to_log(cld.err); | |
449 | ||
450 | return finish_command(&cld); | |
451 | } | |
452 | ||
d819e4e6 JH |
453 | static int upload_pack(void) |
454 | { | |
455 | /* Timeout as string */ | |
456 | char timeout_buf[64]; | |
66dbfd55 GV |
457 | const char *argv[] = { "upload-pack", "--strict", NULL, ".", NULL }; |
458 | ||
459 | argv[2] = timeout_buf; | |
d819e4e6 | 460 | |
960deccb | 461 | snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout); |
5d87dd4f | 462 | return run_service_command(argv); |
a87e8be2 LT |
463 | } |
464 | ||
39345a21 FBH |
465 | static int upload_archive(void) |
466 | { | |
5d87dd4f JS |
467 | static const char *argv[] = { "upload-archive", ".", NULL }; |
468 | return run_service_command(argv); | |
39345a21 FBH |
469 | } |
470 | ||
4b3b1e1e LT |
471 | static int receive_pack(void) |
472 | { | |
5d87dd4f JS |
473 | static const char *argv[] = { "receive-pack", ".", NULL }; |
474 | return run_service_command(argv); | |
4b3b1e1e LT |
475 | } |
476 | ||
d819e4e6 | 477 | static struct daemon_service daemon_service[] = { |
39345a21 | 478 | { "upload-archive", "uploadarch", upload_archive, 0, 1 }, |
d819e4e6 | 479 | { "upload-pack", "uploadpack", upload_pack, 1, 1 }, |
4b3b1e1e | 480 | { "receive-pack", "receivepack", receive_pack, 0, 1 }, |
d819e4e6 JH |
481 | }; |
482 | ||
f3fa1838 JH |
483 | static void enable_service(const char *name, int ena) |
484 | { | |
d819e4e6 JH |
485 | int i; |
486 | for (i = 0; i < ARRAY_SIZE(daemon_service); i++) { | |
487 | if (!strcmp(daemon_service[i].name, name)) { | |
488 | daemon_service[i].enabled = ena; | |
489 | return; | |
490 | } | |
491 | } | |
492 | die("No such service %s", name); | |
493 | } | |
494 | ||
f3fa1838 JH |
495 | static void make_service_overridable(const char *name, int ena) |
496 | { | |
d819e4e6 JH |
497 | int i; |
498 | for (i = 0; i < ARRAY_SIZE(daemon_service); i++) { | |
499 | if (!strcmp(daemon_service[i].name, name)) { | |
500 | daemon_service[i].overridable = ena; | |
501 | return; | |
502 | } | |
503 | } | |
504 | die("No such service %s", name); | |
505 | } | |
506 | ||
e8dbd76d IL |
507 | static void parse_host_and_port(char *hostport, char **host, |
508 | char **port) | |
509 | { | |
510 | if (*hostport == '[') { | |
511 | char *end; | |
512 | ||
513 | end = strchr(hostport, ']'); | |
514 | if (!end) | |
9517e6b8 | 515 | die("Invalid request ('[' without ']')"); |
e8dbd76d IL |
516 | *end = '\0'; |
517 | *host = hostport + 1; | |
518 | if (!end[1]) | |
519 | *port = NULL; | |
520 | else if (end[1] == ':') | |
521 | *port = end + 2; | |
522 | else | |
523 | die("Garbage after end of host part"); | |
524 | } else { | |
525 | *host = hostport; | |
526 | *port = strrchr(hostport, ':'); | |
527 | if (*port) { | |
e9bd3235 | 528 | **port = '\0'; |
e8dbd76d IL |
529 | ++*port; |
530 | } | |
531 | } | |
532 | } | |
533 | ||
b4853730 JK |
534 | /* |
535 | * Sanitize a string from the client so that it's OK to be inserted into a | |
536 | * filesystem path. Specifically, we disallow slashes, runs of "..", and | |
537 | * trailing and leading dots, which means that the client cannot escape | |
538 | * our base path via ".." traversal. | |
539 | */ | |
7a646cec | 540 | static void sanitize_client(struct strbuf *out, const char *in) |
b4853730 JK |
541 | { |
542 | for (; *in; in++) { | |
543 | if (*in == '/') | |
544 | continue; | |
545 | if (*in == '.' && (!out->len || out->buf[out->len - 1] == '.')) | |
546 | continue; | |
547 | strbuf_addch(out, *in); | |
548 | } | |
549 | ||
550 | while (out->len && out->buf[out->len - 1] == '.') | |
551 | strbuf_setlen(out, out->len - 1); | |
552 | } | |
553 | ||
b4853730 JK |
554 | /* |
555 | * Like sanitize_client, but we also perform any canonicalization | |
556 | * to make life easier on the admin. | |
557 | */ | |
7a646cec | 558 | static void canonicalize_client(struct strbuf *out, const char *in) |
b4853730 | 559 | { |
7a646cec RS |
560 | sanitize_client(out, in); |
561 | strbuf_tolower(out); | |
b4853730 JK |
562 | } |
563 | ||
eb30aed7 | 564 | /* |
73bb33a9 | 565 | * Read the host as supplied by the client connection. |
eb30aed7 | 566 | */ |
01cec54e | 567 | static void parse_host_arg(struct hostinfo *hi, char *extra_args, int buflen) |
49ba83fb JL |
568 | { |
569 | char *val; | |
570 | int vallen; | |
571 | char *end = extra_args + buflen; | |
572 | ||
73bb33a9 | 573 | if (extra_args < end && *extra_args) { |
01cec54e | 574 | hi->saw_extended_args = 1; |
49ba83fb JL |
575 | if (strncasecmp("host=", extra_args, 5) == 0) { |
576 | val = extra_args + 5; | |
577 | vallen = strlen(val) + 1; | |
578 | if (*val) { | |
eb30aed7 | 579 | /* Split <host>:<port> at colon. */ |
e8dbd76d IL |
580 | char *host; |
581 | char *port; | |
582 | parse_host_and_port(val, &host, &port); | |
01cec54e RS |
583 | if (port) |
584 | sanitize_client(&hi->tcp_port, port); | |
585 | canonicalize_client(&hi->hostname, host); | |
586 | hi->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 | */ | |
01cec54e | 600 | static void lookup_hostname(struct hostinfo *hi) |
edef953e | 601 | { |
01cec54e | 602 | if (!hi->hostname_lookup_done && hi->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 | ||
01cec54e | 612 | gai = getaddrinfo(hi->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)); | |
01cec54e | 618 | strbuf_addstr(&hi->ip_address, addrbuf); |
3e8a00ae | 619 | |
7a646cec | 620 | if (ai->ai_canonname) |
01cec54e | 621 | sanitize_client(&hi->canon_hostname, |
7a646cec RS |
622 | ai->ai_canonname); |
623 | else | |
01cec54e RS |
624 | strbuf_addbuf(&hi->canon_hostname, |
625 | &hi->ip_address); | |
3e8a00ae BK |
626 | |
627 | freeaddrinfo(ai); | |
dd467629 | 628 | } |
dd467629 | 629 | #else |
dd467629 JL |
630 | struct hostent *hent; |
631 | struct sockaddr_in sa; | |
632 | char **ap; | |
633 | static char addrbuf[HOST_NAME_MAX + 1]; | |
634 | ||
d358f771 | 635 | hent = gethostbyname(hi->hostname.buf); |
eb6c4035 RS |
636 | if (hent) { |
637 | ap = hent->h_addr_list; | |
638 | memset(&sa, 0, sizeof sa); | |
639 | sa.sin_family = hent->h_addrtype; | |
640 | sa.sin_port = htons(0); | |
641 | memcpy(&sa.sin_addr, *ap, hent->h_length); | |
642 | ||
643 | inet_ntop(hent->h_addrtype, &sa.sin_addr, | |
644 | addrbuf, sizeof(addrbuf)); | |
dd467629 | 645 | |
01cec54e RS |
646 | sanitize_client(&hi->canon_hostname, hent->h_name); |
647 | strbuf_addstr(&hi->ip_address, addrbuf); | |
eb6c4035 | 648 | } |
dd467629 | 649 | #endif |
01cec54e | 650 | hi->hostname_lookup_done = 1; |
6720e95b | 651 | } |
dd467629 JL |
652 | } |
653 | ||
01cec54e RS |
654 | static void hostinfo_init(struct hostinfo *hi) |
655 | { | |
656 | memset(hi, 0, sizeof(*hi)); | |
657 | strbuf_init(&hi->hostname, 0); | |
658 | strbuf_init(&hi->canon_hostname, 0); | |
659 | strbuf_init(&hi->ip_address, 0); | |
660 | strbuf_init(&hi->tcp_port, 0); | |
661 | } | |
662 | ||
663 | static void hostinfo_clear(struct hostinfo *hi) | |
664 | { | |
665 | strbuf_release(&hi->hostname); | |
666 | strbuf_release(&hi->canon_hostname); | |
667 | strbuf_release(&hi->ip_address); | |
668 | strbuf_release(&hi->tcp_port); | |
669 | } | |
dd467629 | 670 | |
a43b68a1 EW |
671 | static void set_keep_alive(int sockfd) |
672 | { | |
673 | int ka = 1; | |
674 | ||
49c58d86 EW |
675 | if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0) { |
676 | if (errno != ENOTSOCK) | |
677 | logerror("unable to set SO_KEEPALIVE on socket: %s", | |
678 | strerror(errno)); | |
679 | } | |
a43b68a1 EW |
680 | } |
681 | ||
f9c87be6 | 682 | static int execute(void) |
a87e8be2 | 683 | { |
74543a04 | 684 | char *line = packet_buffer; |
d819e4e6 | 685 | int pktlen, len, i; |
f9c87be6 | 686 | char *addr = getenv("REMOTE_ADDR"), *port = getenv("REMOTE_PORT"); |
01cec54e RS |
687 | struct hostinfo hi; |
688 | ||
689 | hostinfo_init(&hi); | |
7d80694a | 690 | |
f9c87be6 EFL |
691 | if (addr) |
692 | loginfo("Connection from %s:%s", addr, port); | |
5b276ee4 | 693 | |
a43b68a1 | 694 | set_keep_alive(0); |
960deccb | 695 | alarm(init_timeout ? init_timeout : timeout); |
4981fe75 | 696 | pktlen = packet_read(0, NULL, NULL, packet_buffer, sizeof(packet_buffer), 0); |
960deccb | 697 | alarm(0); |
7d80694a | 698 | |
5ad312be JL |
699 | len = strlen(line); |
700 | if (pktlen != len) | |
701 | loginfo("Extended attributes (%d bytes) exist <%.*s>", | |
702 | (int) pktlen - len, | |
703 | (int) pktlen - len, line + len + 1); | |
83543a24 | 704 | if (len && line[len-1] == '\n') { |
7d80694a | 705 | line[--len] = 0; |
83543a24 JH |
706 | pktlen--; |
707 | } | |
7d80694a | 708 | |
d433ed0b | 709 | if (len != pktlen) |
01cec54e | 710 | parse_host_arg(&hi, line + len + 1, pktlen - len - 1); |
49ba83fb | 711 | |
d819e4e6 JH |
712 | for (i = 0; i < ARRAY_SIZE(daemon_service); i++) { |
713 | struct daemon_service *s = &(daemon_service[i]); | |
d12c24d2 JK |
714 | const char *arg; |
715 | ||
716 | if (skip_prefix(line, "git-", &arg) && | |
717 | skip_prefix(arg, s->name, &arg) && | |
718 | *arg++ == ' ') { | |
eb30aed7 JL |
719 | /* |
720 | * Note: The directory here is probably context sensitive, | |
721 | * and might depend on the actual service being performed. | |
722 | */ | |
01cec54e RS |
723 | int rc = run_service(arg, s, &hi); |
724 | hostinfo_clear(&hi); | |
725 | return rc; | |
49ba83fb | 726 | } |
d819e4e6 | 727 | } |
a87e8be2 | 728 | |
01cec54e | 729 | hostinfo_clear(&hi); |
f8ff0c06 | 730 | logerror("Protocol error: '%s'", line); |
a87e8be2 LT |
731 | return -1; |
732 | } | |
733 | ||
15515b73 EFL |
734 | static int addrcmp(const struct sockaddr_storage *s1, |
735 | const struct sockaddr_storage *s2) | |
736 | { | |
3aff874a BC |
737 | const struct sockaddr *sa1 = (const struct sockaddr*) s1; |
738 | const struct sockaddr *sa2 = (const struct sockaddr*) s2; | |
739 | ||
740 | if (sa1->sa_family != sa2->sa_family) | |
741 | return sa1->sa_family - sa2->sa_family; | |
742 | if (sa1->sa_family == AF_INET) | |
15515b73 EFL |
743 | return memcmp(&((struct sockaddr_in *)s1)->sin_addr, |
744 | &((struct sockaddr_in *)s2)->sin_addr, | |
745 | sizeof(struct in_addr)); | |
746 | #ifndef NO_IPV6 | |
3aff874a | 747 | if (sa1->sa_family == AF_INET6) |
15515b73 EFL |
748 | return memcmp(&((struct sockaddr_in6 *)s1)->sin6_addr, |
749 | &((struct sockaddr_in6 *)s2)->sin6_addr, | |
750 | sizeof(struct in6_addr)); | |
751 | #endif | |
752 | return 0; | |
753 | } | |
754 | ||
3bd62c21 | 755 | static int max_connections = 32; |
66e631de | 756 | |
3bd62c21 | 757 | static unsigned int live_children; |
66e631de | 758 | |
4d8fa916 | 759 | static struct child { |
3bd62c21 | 760 | struct child *next; |
30e15602 | 761 | struct child_process cld; |
df076bdb | 762 | struct sockaddr_storage address; |
3bd62c21 | 763 | } *firstborn; |
66e631de | 764 | |
c295cf06 | 765 | static void add_child(struct child_process *cld, struct sockaddr *addr, socklen_t addrlen) |
66e631de | 766 | { |
460c2010 JH |
767 | struct child *newborn, **cradle; |
768 | ||
460c2010 JH |
769 | newborn = xcalloc(1, sizeof(*newborn)); |
770 | live_children++; | |
30e15602 | 771 | memcpy(&newborn->cld, cld, sizeof(*cld)); |
460c2010 JH |
772 | memcpy(&newborn->address, addr, addrlen); |
773 | for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next) | |
15515b73 | 774 | if (!addrcmp(&(*cradle)->address, &newborn->address)) |
460c2010 JH |
775 | break; |
776 | newborn->next = *cradle; | |
777 | *cradle = newborn; | |
66e631de LT |
778 | } |
779 | ||
66e631de LT |
780 | /* |
781 | * This gets called if the number of connections grows | |
782 | * past "max_connections". | |
783 | * | |
3bd62c21 | 784 | * We kill the newest connection from a duplicate IP. |
66e631de | 785 | */ |
3bd62c21 | 786 | static void kill_some_child(void) |
66e631de | 787 | { |
460c2010 | 788 | const struct child *blanket, *next; |
66e631de | 789 | |
460c2010 JH |
790 | if (!(blanket = firstborn)) |
791 | return; | |
695605b5 | 792 | |
460c2010 | 793 | for (; (next = blanket->next); blanket = next) |
15515b73 | 794 | if (!addrcmp(&blanket->address, &next->address)) { |
30e15602 | 795 | kill(blanket->cld.pid, SIGTERM); |
460c2010 JH |
796 | break; |
797 | } | |
a5a9126b JS |
798 | } |
799 | ||
3bd62c21 | 800 | static void check_dead_children(void) |
a87e8be2 | 801 | { |
3bd62c21 SB |
802 | int status; |
803 | pid_t pid; | |
02d57da4 | 804 | |
30e15602 EFL |
805 | struct child **cradle, *blanket; |
806 | for (cradle = &firstborn; (blanket = *cradle);) | |
807 | if ((pid = waitpid(blanket->cld.pid, &status, WNOHANG)) > 1) { | |
808 | const char *dead = ""; | |
809 | if (status) | |
810 | dead = " (with error)"; | |
811 | loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead); | |
812 | ||
813 | /* remove the child */ | |
814 | *cradle = blanket->next; | |
815 | live_children--; | |
b1b49ff8 | 816 | child_process_clear(&blanket->cld); |
30e15602 EFL |
817 | free(blanket); |
818 | } else | |
819 | cradle = &blanket->next; | |
02d57da4 LT |
820 | } |
821 | ||
850d2fec | 822 | static struct argv_array cld_argv = ARGV_ARRAY_INIT; |
c295cf06 | 823 | static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen) |
02d57da4 | 824 | { |
d3180279 | 825 | struct child_process cld = CHILD_PROCESS_INIT; |
02d57da4 | 826 | |
3bd62c21 SB |
827 | if (max_connections && live_children >= max_connections) { |
828 | kill_some_child(); | |
460c2010 | 829 | sleep(1); /* give it some time to die */ |
3bd62c21 SB |
830 | check_dead_children(); |
831 | if (live_children >= max_connections) { | |
832 | close(incoming); | |
833 | logerror("Too many children, dropping connection"); | |
834 | return; | |
835 | } | |
836 | } | |
02d57da4 | 837 | |
f9c87be6 | 838 | if (addr->sa_family == AF_INET) { |
f063d38b | 839 | char buf[128] = ""; |
f9c87be6 | 840 | struct sockaddr_in *sin_addr = (void *) addr; |
f063d38b JK |
841 | inet_ntop(addr->sa_family, &sin_addr->sin_addr, buf, sizeof(buf)); |
842 | argv_array_pushf(&cld.env_array, "REMOTE_ADDR=%s", buf); | |
843 | argv_array_pushf(&cld.env_array, "REMOTE_PORT=%d", | |
844 | ntohs(sin_addr->sin_port)); | |
f9c87be6 | 845 | #ifndef NO_IPV6 |
5d9cfa29 | 846 | } else if (addr->sa_family == AF_INET6) { |
f063d38b | 847 | char buf[128] = ""; |
f9c87be6 | 848 | struct sockaddr_in6 *sin6_addr = (void *) addr; |
f063d38b JK |
849 | inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(buf)); |
850 | argv_array_pushf(&cld.env_array, "REMOTE_ADDR=[%s]", buf); | |
851 | argv_array_pushf(&cld.env_array, "REMOTE_PORT=%d", | |
852 | ntohs(sin6_addr->sin6_port)); | |
f9c87be6 EFL |
853 | #endif |
854 | } | |
855 | ||
850d2fec | 856 | cld.argv = cld_argv.argv; |
30e15602 EFL |
857 | cld.in = incoming; |
858 | cld.out = dup(incoming); | |
a87e8be2 | 859 | |
30e15602 EFL |
860 | if (start_command(&cld)) |
861 | logerror("unable to fork"); | |
862 | else | |
863 | add_child(&cld, addr, addrlen); | |
a87e8be2 LT |
864 | } |
865 | ||
eaa94919 LT |
866 | static void child_handler(int signo) |
867 | { | |
460c2010 JH |
868 | /* |
869 | * Otherwise empty handler because systemcalls will get interrupted | |
695605b5 SB |
870 | * upon signal receipt |
871 | * SysV needs the handler to be rearmed | |
872 | */ | |
bd7b371e | 873 | signal(SIGCHLD, child_handler); |
eaa94919 LT |
874 | } |
875 | ||
1955fabf MW |
876 | static int set_reuse_addr(int sockfd) |
877 | { | |
878 | int on = 1; | |
879 | ||
880 | if (!reuseaddr) | |
881 | return 0; | |
882 | return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, | |
883 | &on, sizeof(on)); | |
884 | } | |
885 | ||
2caa3215 AS |
886 | struct socketlist { |
887 | int *list; | |
888 | size_t nr; | |
889 | size_t alloc; | |
890 | }; | |
891 | ||
089d82e8 NTND |
892 | static const char *ip2str(int family, struct sockaddr *sin, socklen_t len) |
893 | { | |
894 | #ifdef NO_IPV6 | |
895 | static char ip[INET_ADDRSTRLEN]; | |
896 | #else | |
897 | static char ip[INET6_ADDRSTRLEN]; | |
898 | #endif | |
899 | ||
900 | switch (family) { | |
901 | #ifndef NO_IPV6 | |
902 | case AF_INET6: | |
903 | inet_ntop(family, &((struct sockaddr_in6*)sin)->sin6_addr, ip, len); | |
904 | break; | |
905 | #endif | |
906 | case AF_INET: | |
907 | inet_ntop(family, &((struct sockaddr_in*)sin)->sin_addr, ip, len); | |
908 | break; | |
909 | default: | |
5096d490 | 910 | xsnprintf(ip, sizeof(ip), "<unknown>"); |
089d82e8 NTND |
911 | } |
912 | return ip; | |
913 | } | |
914 | ||
6573faff PA |
915 | #ifndef NO_IPV6 |
916 | ||
2caa3215 | 917 | static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist) |
a87e8be2 | 918 | { |
2caa3215 | 919 | int socknum = 0; |
df076bdb | 920 | char pbuf[NI_MAXSERV]; |
6573faff PA |
921 | struct addrinfo hints, *ai0, *ai; |
922 | int gai; | |
20276889 | 923 | long flags; |
df076bdb | 924 | |
5096d490 | 925 | xsnprintf(pbuf, sizeof(pbuf), "%d", listen_port); |
df076bdb YH |
926 | memset(&hints, 0, sizeof(hints)); |
927 | hints.ai_family = AF_UNSPEC; | |
928 | hints.ai_socktype = SOCK_STREAM; | |
929 | hints.ai_protocol = IPPROTO_TCP; | |
930 | hints.ai_flags = AI_PASSIVE; | |
931 | ||
dd467629 | 932 | gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0); |
2caa3215 AS |
933 | if (gai) { |
934 | logerror("getaddrinfo() for %s failed: %s", listen_addr, gai_strerror(gai)); | |
935 | return 0; | |
936 | } | |
df076bdb | 937 | |
df076bdb YH |
938 | for (ai = ai0; ai; ai = ai->ai_next) { |
939 | int sockfd; | |
df076bdb YH |
940 | |
941 | sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); | |
942 | if (sockfd < 0) | |
943 | continue; | |
944 | if (sockfd >= FD_SETSIZE) { | |
df0daf8a | 945 | logerror("Socket descriptor too large"); |
df076bdb YH |
946 | close(sockfd); |
947 | continue; | |
948 | } | |
949 | ||
950 | #ifdef IPV6_V6ONLY | |
951 | if (ai->ai_family == AF_INET6) { | |
952 | int on = 1; | |
953 | setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY, | |
954 | &on, sizeof(on)); | |
955 | /* Note: error is not fatal */ | |
956 | } | |
957 | #endif | |
958 | ||
1955fabf | 959 | if (set_reuse_addr(sockfd)) { |
089d82e8 | 960 | logerror("Could not set SO_REUSEADDR: %s", strerror(errno)); |
1955fabf | 961 | close(sockfd); |
0032d548 | 962 | continue; |
1955fabf MW |
963 | } |
964 | ||
a43b68a1 EW |
965 | set_keep_alive(sockfd); |
966 | ||
df076bdb | 967 | if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) { |
089d82e8 NTND |
968 | logerror("Could not bind to %s: %s", |
969 | ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen), | |
970 | strerror(errno)); | |
df076bdb YH |
971 | close(sockfd); |
972 | continue; /* not fatal */ | |
973 | } | |
974 | if (listen(sockfd, 5) < 0) { | |
089d82e8 NTND |
975 | logerror("Could not listen to %s: %s", |
976 | ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen), | |
977 | strerror(errno)); | |
df076bdb YH |
978 | close(sockfd); |
979 | continue; /* not fatal */ | |
980 | } | |
981 | ||
20276889 AJ |
982 | flags = fcntl(sockfd, F_GETFD, 0); |
983 | if (flags >= 0) | |
984 | fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC); | |
985 | ||
2caa3215 AS |
986 | ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc); |
987 | socklist->list[socklist->nr++] = sockfd; | |
988 | socknum++; | |
df076bdb YH |
989 | } |
990 | ||
991 | freeaddrinfo(ai0); | |
992 | ||
6573faff PA |
993 | return socknum; |
994 | } | |
995 | ||
996 | #else /* NO_IPV6 */ | |
997 | ||
2caa3215 | 998 | static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist) |
6573faff PA |
999 | { |
1000 | struct sockaddr_in sin; | |
1001 | int sockfd; | |
20276889 | 1002 | long flags; |
6573faff | 1003 | |
dd467629 JL |
1004 | memset(&sin, 0, sizeof sin); |
1005 | sin.sin_family = AF_INET; | |
1006 | sin.sin_port = htons(listen_port); | |
1007 | ||
1008 | if (listen_addr) { | |
1009 | /* Well, host better be an IP address here. */ | |
1010 | if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0) | |
1011 | return 0; | |
1012 | } else { | |
1013 | sin.sin_addr.s_addr = htonl(INADDR_ANY); | |
1014 | } | |
1015 | ||
6573faff PA |
1016 | sockfd = socket(AF_INET, SOCK_STREAM, 0); |
1017 | if (sockfd < 0) | |
1018 | return 0; | |
1019 | ||
1955fabf | 1020 | if (set_reuse_addr(sockfd)) { |
089d82e8 | 1021 | logerror("Could not set SO_REUSEADDR: %s", strerror(errno)); |
1955fabf MW |
1022 | close(sockfd); |
1023 | return 0; | |
1024 | } | |
1025 | ||
a43b68a1 EW |
1026 | set_keep_alive(sockfd); |
1027 | ||
6573faff | 1028 | if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) { |
9d1b9aa9 | 1029 | logerror("Could not bind to %s: %s", |
089d82e8 NTND |
1030 | ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)), |
1031 | strerror(errno)); | |
6573faff PA |
1032 | close(sockfd); |
1033 | return 0; | |
1034 | } | |
a87e8be2 | 1035 | |
f35230fb | 1036 | if (listen(sockfd, 5) < 0) { |
089d82e8 NTND |
1037 | logerror("Could not listen to %s: %s", |
1038 | ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)), | |
1039 | strerror(errno)); | |
f35230fb PS |
1040 | close(sockfd); |
1041 | return 0; | |
1042 | } | |
1043 | ||
20276889 AJ |
1044 | flags = fcntl(sockfd, F_GETFD, 0); |
1045 | if (flags >= 0) | |
1046 | fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC); | |
1047 | ||
2caa3215 AS |
1048 | ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc); |
1049 | socklist->list[socklist->nr++] = sockfd; | |
f35230fb | 1050 | return 1; |
6573faff PA |
1051 | } |
1052 | ||
1053 | #endif | |
1054 | ||
3a3a29c1 | 1055 | static void socksetup(struct string_list *listen_addr, int listen_port, struct socketlist *socklist) |
2caa3215 | 1056 | { |
3a3a29c1 AS |
1057 | if (!listen_addr->nr) |
1058 | setup_named_sock(NULL, listen_port, socklist); | |
1059 | else { | |
1060 | int i, socknum; | |
1061 | for (i = 0; i < listen_addr->nr; i++) { | |
1062 | socknum = setup_named_sock(listen_addr->items[i].string, | |
1063 | listen_port, socklist); | |
1064 | ||
1065 | if (socknum == 0) | |
1066 | logerror("unable to allocate any listen sockets for host %s on port %u", | |
1067 | listen_addr->items[i].string, listen_port); | |
1068 | } | |
1069 | } | |
2caa3215 AS |
1070 | } |
1071 | ||
1072 | static int service_loop(struct socketlist *socklist) | |
6573faff PA |
1073 | { |
1074 | struct pollfd *pfd; | |
1075 | int i; | |
1076 | ||
2caa3215 | 1077 | pfd = xcalloc(socklist->nr, sizeof(struct pollfd)); |
6573faff | 1078 | |
2caa3215 AS |
1079 | for (i = 0; i < socklist->nr; i++) { |
1080 | pfd[i].fd = socklist->list[i]; | |
6573faff PA |
1081 | pfd[i].events = POLLIN; |
1082 | } | |
9220282a PA |
1083 | |
1084 | signal(SIGCHLD, child_handler); | |
a87e8be2 LT |
1085 | |
1086 | for (;;) { | |
df076bdb | 1087 | int i; |
6573faff | 1088 | |
695605b5 SB |
1089 | check_dead_children(); |
1090 | ||
2caa3215 | 1091 | if (poll(pfd, socklist->nr, -1) < 0) { |
1eef0b33 | 1092 | if (errno != EINTR) { |
df0daf8a | 1093 | logerror("Poll failed, resuming: %s", |
1eef0b33 JH |
1094 | strerror(errno)); |
1095 | sleep(1); | |
1096 | } | |
df076bdb YH |
1097 | continue; |
1098 | } | |
1099 | ||
2caa3215 | 1100 | for (i = 0; i < socklist->nr; i++) { |
6573faff | 1101 | if (pfd[i].revents & POLLIN) { |
f9c87be6 EFL |
1102 | union { |
1103 | struct sockaddr sa; | |
1104 | struct sockaddr_in sai; | |
1105 | #ifndef NO_IPV6 | |
1106 | struct sockaddr_in6 sai6; | |
1107 | #endif | |
1108 | } ss; | |
c295cf06 | 1109 | socklen_t sslen = sizeof(ss); |
f9c87be6 | 1110 | int incoming = accept(pfd[i].fd, &ss.sa, &sslen); |
df076bdb YH |
1111 | if (incoming < 0) { |
1112 | switch (errno) { | |
1113 | case EAGAIN: | |
1114 | case EINTR: | |
1115 | case ECONNABORTED: | |
1116 | continue; | |
1117 | default: | |
d824cbba | 1118 | die_errno("accept returned"); |
df076bdb YH |
1119 | } |
1120 | } | |
f9c87be6 | 1121 | handle(incoming, &ss.sa, sslen); |
a87e8be2 LT |
1122 | } |
1123 | } | |
a87e8be2 LT |
1124 | } |
1125 | } | |
1126 | ||
a666b472 EFL |
1127 | #ifdef NO_POSIX_GOODIES |
1128 | ||
1129 | struct credentials; | |
1130 | ||
1131 | static void drop_privileges(struct credentials *cred) | |
1132 | { | |
1133 | /* nothing */ | |
1134 | } | |
1135 | ||
a666b472 EFL |
1136 | static struct credentials *prepare_credentials(const char *user_name, |
1137 | const char *group_name) | |
1138 | { | |
1139 | die("--user not supported on this platform"); | |
1140 | } | |
1141 | ||
1142 | #else | |
1143 | ||
1144 | struct credentials { | |
1145 | struct passwd *pass; | |
1146 | gid_t gid; | |
1147 | }; | |
1148 | ||
1149 | static void drop_privileges(struct credentials *cred) | |
1150 | { | |
1151 | if (cred && (initgroups(cred->pass->pw_name, cred->gid) || | |
1152 | setgid (cred->gid) || setuid(cred->pass->pw_uid))) | |
1153 | die("cannot drop privileges"); | |
1154 | } | |
1155 | ||
1156 | static struct credentials *prepare_credentials(const char *user_name, | |
1157 | const char *group_name) | |
1158 | { | |
1159 | static struct credentials c; | |
1160 | ||
1161 | c.pass = getpwnam(user_name); | |
1162 | if (!c.pass) | |
1163 | die("user not found - %s", user_name); | |
1164 | ||
1165 | if (!group_name) | |
1166 | c.gid = c.pass->pw_gid; | |
1167 | else { | |
1168 | struct group *group = getgrnam(group_name); | |
1169 | if (!group) | |
1170 | die("group not found - %s", group_name); | |
1171 | ||
1172 | c.gid = group->gr_gid; | |
1173 | } | |
1174 | ||
1175 | return &c; | |
1176 | } | |
a666b472 | 1177 | #endif |
a5262768 | 1178 | |
a666b472 EFL |
1179 | static int serve(struct string_list *listen_addr, int listen_port, |
1180 | struct credentials *cred) | |
6573faff | 1181 | { |
2caa3215 | 1182 | struct socketlist socklist = { NULL, 0, 0 }; |
4ae22d96 | 1183 | |
2caa3215 AS |
1184 | socksetup(listen_addr, listen_port, &socklist); |
1185 | if (socklist.nr == 0) | |
3a3a29c1 AS |
1186 | die("unable to allocate any listen sockets on port %u", |
1187 | listen_port); | |
4ae22d96 | 1188 | |
a666b472 | 1189 | drop_privileges(cred); |
678dac6b | 1190 | |
f6a34cfb CB |
1191 | loginfo("Ready to rumble"); |
1192 | ||
2caa3215 | 1193 | return service_loop(&socklist); |
4ae22d96 | 1194 | } |
6573faff | 1195 | |
3f2e2297 | 1196 | int cmd_main(int argc, const char **argv) |
a87e8be2 | 1197 | { |
dd467629 | 1198 | int listen_port = 0; |
3a3a29c1 | 1199 | struct string_list listen_addr = STRING_LIST_INIT_NODUP; |
30e15602 | 1200 | int serve_mode = 0, inetd_mode = 0; |
678dac6b | 1201 | const char *pid_file = NULL, *user_name = NULL, *group_name = NULL; |
a5262768 | 1202 | int detach = 0; |
a666b472 | 1203 | struct credentials *cred = NULL; |
a87e8be2 LT |
1204 | int i; |
1205 | ||
1206 | for (i = 1; i < argc; i++) { | |
3f2e2297 | 1207 | const char *arg = argv[i]; |
ae021d87 | 1208 | const char *v; |
a87e8be2 | 1209 | |
ae021d87 JK |
1210 | if (skip_prefix(arg, "--listen=", &v)) { |
1211 | string_list_append(&listen_addr, xstrdup_tolower(v)); | |
6720e95b | 1212 | continue; |
dd467629 | 1213 | } |
ae021d87 | 1214 | if (skip_prefix(arg, "--port=", &v)) { |
a87e8be2 LT |
1215 | char *end; |
1216 | unsigned long n; | |
ae021d87 JK |
1217 | n = strtoul(v, &end, 0); |
1218 | if (*v && !*end) { | |
dd467629 | 1219 | listen_port = n; |
a87e8be2 LT |
1220 | continue; |
1221 | } | |
1222 | } | |
30e15602 EFL |
1223 | if (!strcmp(arg, "--serve")) { |
1224 | serve_mode = 1; | |
1225 | continue; | |
1226 | } | |
e64e1b79 LT |
1227 | if (!strcmp(arg, "--inetd")) { |
1228 | inetd_mode = 1; | |
a8883288 | 1229 | log_syslog = 1; |
e64e1b79 LT |
1230 | continue; |
1231 | } | |
f8ff0c06 PB |
1232 | if (!strcmp(arg, "--verbose")) { |
1233 | verbose = 1; | |
1234 | continue; | |
1235 | } | |
9048fe1c PB |
1236 | if (!strcmp(arg, "--syslog")) { |
1237 | log_syslog = 1; | |
9048fe1c PB |
1238 | continue; |
1239 | } | |
4ae95682 PA |
1240 | if (!strcmp(arg, "--export-all")) { |
1241 | export_all_trees = 1; | |
1242 | continue; | |
1243 | } | |
ae021d87 JK |
1244 | if (skip_prefix(arg, "--access-hook=", &v)) { |
1245 | access_hook = v; | |
93741e4a JH |
1246 | continue; |
1247 | } | |
ae021d87 JK |
1248 | if (skip_prefix(arg, "--timeout=", &v)) { |
1249 | timeout = atoi(v); | |
a8883288 | 1250 | continue; |
960deccb | 1251 | } |
ae021d87 JK |
1252 | if (skip_prefix(arg, "--init-timeout=", &v)) { |
1253 | init_timeout = atoi(v); | |
a8883288 | 1254 | continue; |
960deccb | 1255 | } |
ae021d87 JK |
1256 | if (skip_prefix(arg, "--max-connections=", &v)) { |
1257 | max_connections = atoi(v); | |
3bd62c21 SB |
1258 | if (max_connections < 0) |
1259 | max_connections = 0; /* unlimited */ | |
1260 | continue; | |
1261 | } | |
4dbd1352 AE |
1262 | if (!strcmp(arg, "--strict-paths")) { |
1263 | strict_paths = 1; | |
1264 | continue; | |
1265 | } | |
ae021d87 JK |
1266 | if (skip_prefix(arg, "--base-path=", &v)) { |
1267 | base_path = v; | |
b21c31c9 PB |
1268 | continue; |
1269 | } | |
73a7a656 JA |
1270 | if (!strcmp(arg, "--base-path-relaxed")) { |
1271 | base_path_relaxed = 1; | |
1272 | continue; | |
1273 | } | |
ae021d87 JK |
1274 | if (skip_prefix(arg, "--interpolated-path=", &v)) { |
1275 | interpolated_path = v; | |
49ba83fb JL |
1276 | continue; |
1277 | } | |
1955fabf MW |
1278 | if (!strcmp(arg, "--reuseaddr")) { |
1279 | reuseaddr = 1; | |
1280 | continue; | |
1281 | } | |
603968d2 JH |
1282 | if (!strcmp(arg, "--user-path")) { |
1283 | user_path = ""; | |
1284 | continue; | |
1285 | } | |
ae021d87 JK |
1286 | if (skip_prefix(arg, "--user-path=", &v)) { |
1287 | user_path = v; | |
603968d2 JH |
1288 | continue; |
1289 | } | |
ae021d87 JK |
1290 | if (skip_prefix(arg, "--pid-file=", &v)) { |
1291 | pid_file = v; | |
45ed5d7f ML |
1292 | continue; |
1293 | } | |
a5262768 ML |
1294 | if (!strcmp(arg, "--detach")) { |
1295 | detach = 1; | |
1296 | log_syslog = 1; | |
1297 | continue; | |
1298 | } | |
ae021d87 JK |
1299 | if (skip_prefix(arg, "--user=", &v)) { |
1300 | user_name = v; | |
678dac6b TS |
1301 | continue; |
1302 | } | |
ae021d87 JK |
1303 | if (skip_prefix(arg, "--group=", &v)) { |
1304 | group_name = v; | |
678dac6b TS |
1305 | continue; |
1306 | } | |
ae021d87 JK |
1307 | if (skip_prefix(arg, "--enable=", &v)) { |
1308 | enable_service(v, 1); | |
d819e4e6 JH |
1309 | continue; |
1310 | } | |
ae021d87 JK |
1311 | if (skip_prefix(arg, "--disable=", &v)) { |
1312 | enable_service(v, 0); | |
d819e4e6 JH |
1313 | continue; |
1314 | } | |
ae021d87 JK |
1315 | if (skip_prefix(arg, "--allow-override=", &v)) { |
1316 | make_service_overridable(v, 1); | |
d819e4e6 JH |
1317 | continue; |
1318 | } | |
ae021d87 JK |
1319 | if (skip_prefix(arg, "--forbid-override=", &v)) { |
1320 | make_service_overridable(v, 0); | |
d819e4e6 JH |
1321 | continue; |
1322 | } | |
82246b76 | 1323 | if (!strcmp(arg, "--informative-errors")) { |
d5570f4d JK |
1324 | informative_errors = 1; |
1325 | continue; | |
1326 | } | |
82246b76 | 1327 | if (!strcmp(arg, "--no-informative-errors")) { |
d5570f4d JK |
1328 | informative_errors = 0; |
1329 | continue; | |
1330 | } | |
4ae95682 PA |
1331 | if (!strcmp(arg, "--")) { |
1332 | ok_paths = &argv[i+1]; | |
1333 | break; | |
1334 | } else if (arg[0] != '-') { | |
1335 | ok_paths = &argv[i]; | |
1336 | break; | |
1337 | } | |
e64e1b79 | 1338 | |
a87e8be2 LT |
1339 | usage(daemon_usage); |
1340 | } | |
1341 | ||
22665bba | 1342 | if (log_syslog) { |
6a992e9e | 1343 | openlog("git-daemon", LOG_PID, LOG_DAEMON); |
22665bba | 1344 | set_die_routine(daemon_die); |
460c2010 | 1345 | } else |
48196afd | 1346 | /* avoid splitting a message in the middle */ |
48cfaea1 | 1347 | setvbuf(stderr, NULL, _IOFBF, 4096); |
22665bba | 1348 | |
9cddf56e EFL |
1349 | if (inetd_mode && (detach || group_name || user_name)) |
1350 | die("--detach, --user and --group are incompatible with --inetd"); | |
678dac6b | 1351 | |
3a3a29c1 | 1352 | if (inetd_mode && (listen_port || (listen_addr.nr > 0))) |
dd467629 JL |
1353 | die("--listen= and --port= are incompatible with --inetd"); |
1354 | else if (listen_port == 0) | |
1355 | listen_port = DEFAULT_GIT_PORT; | |
1356 | ||
678dac6b TS |
1357 | if (group_name && !user_name) |
1358 | die("--group supplied without --user"); | |
1359 | ||
a666b472 EFL |
1360 | if (user_name) |
1361 | cred = prepare_credentials(user_name, group_name); | |
678dac6b | 1362 | |
ad8b4f56 ML |
1363 | if (strict_paths && (!ok_paths || !*ok_paths)) |
1364 | die("option --strict-paths requires a whitelist"); | |
1365 | ||
90b4a71c JH |
1366 | if (base_path && !is_directory(base_path)) |
1367 | die("base-path '%s' does not exist or is not a directory", | |
1368 | base_path); | |
20632071 | 1369 | |
7c3693f1 | 1370 | if (inetd_mode) { |
30e15602 EFL |
1371 | if (!freopen("/dev/null", "w", stderr)) |
1372 | die_errno("failed to redirect stderr to /dev/null"); | |
1373 | } | |
1374 | ||
f9c87be6 EFL |
1375 | if (inetd_mode || serve_mode) |
1376 | return execute(); | |
bce8230d | 1377 | |
de0957ce NTND |
1378 | if (detach) { |
1379 | if (daemonize()) | |
1380 | die("--detach not supported on this platform"); | |
57f5d52a | 1381 | } |
258e93a1 | 1382 | |
45ed5d7f | 1383 | if (pid_file) |
1f76a10b | 1384 | write_file(pid_file, "%"PRIuMAX, (uintmax_t) getpid()); |
45ed5d7f | 1385 | |
30e15602 | 1386 | /* prepare argv for serving-processes */ |
850d2fec JK |
1387 | argv_array_push(&cld_argv, argv[0]); /* git-daemon */ |
1388 | argv_array_push(&cld_argv, "--serve"); | |
081f84ee | 1389 | for (i = 1; i < argc; ++i) |
850d2fec | 1390 | argv_array_push(&cld_argv, argv[i]); |
30e15602 | 1391 | |
a666b472 | 1392 | return serve(&listen_addr, listen_port, cred); |
a87e8be2 | 1393 | } |