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Commit | Line | Data |
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5e3f94df | 1 | #include "git-compat-util.h" |
0b027f6c | 2 | #include "abspath.h" |
b2141fc1 | 3 | #include "config.h" |
32a8f510 | 4 | #include "environment.h" |
d1cbe1e6 | 5 | #include "path.h" |
85023577 | 6 | #include "pkt-line.h" |
331b094e | 7 | #include "protocol.h" |
5d87dd4f | 8 | #include "run-command.h" |
e38da487 | 9 | #include "setup.h" |
5d87dd4f | 10 | #include "strbuf.h" |
3a3a29c1 | 11 | #include "string-list.h" |
f8ff0c06 | 12 | |
2844923d MD |
13 | #ifdef NO_INITGROUPS |
14 | #define initgroups(x, y) (0) /* nothing */ | |
15 | #endif | |
16 | ||
0c591cac LW |
17 | static enum log_destination { |
18 | LOG_DESTINATION_UNSET = -1, | |
19 | LOG_DESTINATION_NONE = 0, | |
20 | LOG_DESTINATION_STDERR = 1, | |
21 | LOG_DESTINATION_SYSLOG = 2, | |
22 | } log_destination = LOG_DESTINATION_UNSET; | |
f8ff0c06 | 23 | static int verbose; |
1955fabf | 24 | static int reuseaddr; |
d5570f4d | 25 | static int informative_errors; |
f8ff0c06 | 26 | |
960deccb | 27 | static const char daemon_usage[] = |
1b1dd23f | 28 | "git daemon [--verbose] [--syslog] [--export-all]\n" |
62b4698e ŠN |
29 | " [--timeout=<n>] [--init-timeout=<n>] [--max-connections=<n>]\n" |
30 | " [--strict-paths] [--base-path=<path>] [--base-path-relaxed]\n" | |
31 | " [--user-path | --user-path=<path>]\n" | |
32 | " [--interpolated-path=<path>]\n" | |
9cddf56e | 33 | " [--reuseaddr] [--pid-file=<file>]\n" |
62b4698e | 34 | " [--(enable|disable|allow-override|forbid-override)=<service>]\n" |
93741e4a | 35 | " [--access-hook=<path>]\n" |
62b4698e | 36 | " [--inetd | [--listen=<host_or_ipaddr>] [--port=<n>]\n" |
9cddf56e | 37 | " [--detach] [--user=<user> [--group=<group>]]\n" |
0c591cac | 38 | " [--log-destination=(stderr|syslog|none)]\n" |
62b4698e | 39 | " [<directory>...]"; |
4ae95682 PA |
40 | |
41 | /* List of acceptable pathname prefixes */ | |
3f2e2297 | 42 | static const char **ok_paths; |
96f1e58f | 43 | static int strict_paths; |
4ae95682 PA |
44 | |
45 | /* If this is set, git-daemon-export-ok is not required */ | |
96f1e58f | 46 | static int export_all_trees; |
f8ff0c06 | 47 | |
b21c31c9 | 48 | /* Take all paths relative to this one if non-NULL */ |
1055a890 JK |
49 | static const char *base_path; |
50 | static const char *interpolated_path; | |
73a7a656 | 51 | static int base_path_relaxed; |
49ba83fb | 52 | |
603968d2 JH |
53 | /* If defined, ~user notation is allowed and the string is inserted |
54 | * after ~user/. E.g. a request to git://host/~alice/frotz would | |
55 | * go to /home/alice/pub_git/frotz with --user-path=pub_git. | |
56 | */ | |
96f1e58f | 57 | static const char *user_path; |
603968d2 | 58 | |
960deccb | 59 | /* Timeout, and initial timeout */ |
96f1e58f DR |
60 | static unsigned int timeout; |
61 | static unsigned int init_timeout; | |
f8ff0c06 | 62 | |
01cec54e RS |
63 | struct hostinfo { |
64 | struct strbuf hostname; | |
65 | struct strbuf canon_hostname; | |
66 | struct strbuf ip_address; | |
67 | struct strbuf tcp_port; | |
68 | unsigned int hostname_lookup_done:1; | |
69 | unsigned int saw_extended_args:1; | |
70 | }; | |
6e54a324 ÆAB |
71 | #define HOSTINFO_INIT { \ |
72 | .hostname = STRBUF_INIT, \ | |
73 | .canon_hostname = STRBUF_INIT, \ | |
74 | .ip_address = STRBUF_INIT, \ | |
75 | .tcp_port = STRBUF_INIT, \ | |
76 | } | |
edef953e | 77 | |
01cec54e | 78 | static void lookup_hostname(struct hostinfo *hi); |
edef953e | 79 | |
01cec54e | 80 | static const char *get_canon_hostname(struct hostinfo *hi) |
edef953e | 81 | { |
01cec54e RS |
82 | lookup_hostname(hi); |
83 | return hi->canon_hostname.buf; | |
edef953e RS |
84 | } |
85 | ||
01cec54e | 86 | static const char *get_ip_address(struct hostinfo *hi) |
edef953e | 87 | { |
01cec54e RS |
88 | lookup_hostname(hi); |
89 | return hi->ip_address.buf; | |
edef953e RS |
90 | } |
91 | ||
9048fe1c | 92 | static void logreport(int priority, const char *err, va_list params) |
f8ff0c06 | 93 | { |
0c591cac LW |
94 | switch (log_destination) { |
95 | case LOG_DESTINATION_SYSLOG: { | |
6a992e9e SB |
96 | char buf[1024]; |
97 | vsnprintf(buf, sizeof(buf), err, params); | |
9048fe1c | 98 | syslog(priority, "%s", buf); |
0c591cac LW |
99 | break; |
100 | } | |
101 | case LOG_DESTINATION_STDERR: | |
460c2010 | 102 | /* |
48cfaea1 | 103 | * Since stderr is set to buffered mode, the |
6a992e9e | 104 | * logging of different processes will not overlap |
48cfaea1 | 105 | * unless they overflow the (rather big) buffers. |
6a992e9e | 106 | */ |
85e72830 | 107 | fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid()); |
6a992e9e SB |
108 | vfprintf(stderr, err, params); |
109 | fputc('\n', stderr); | |
48cfaea1 | 110 | fflush(stderr); |
0c591cac LW |
111 | break; |
112 | case LOG_DESTINATION_NONE: | |
113 | break; | |
114 | case LOG_DESTINATION_UNSET: | |
115 | BUG("log destination not initialized correctly"); | |
6a992e9e | 116 | } |
f8ff0c06 PB |
117 | } |
118 | ||
28bea9e5 | 119 | __attribute__((format (printf, 1, 2))) |
cdda4745 | 120 | static void logerror(const char *err, ...) |
f8ff0c06 PB |
121 | { |
122 | va_list params; | |
123 | va_start(params, err); | |
9048fe1c | 124 | logreport(LOG_ERR, err, params); |
f8ff0c06 PB |
125 | va_end(params); |
126 | } | |
127 | ||
28bea9e5 | 128 | __attribute__((format (printf, 1, 2))) |
cdda4745 | 129 | static void loginfo(const char *err, ...) |
f8ff0c06 PB |
130 | { |
131 | va_list params; | |
132 | if (!verbose) | |
133 | return; | |
134 | va_start(params, err); | |
9048fe1c | 135 | logreport(LOG_INFO, err, params); |
f8ff0c06 PB |
136 | va_end(params); |
137 | } | |
a87e8be2 | 138 | |
ad8b4f56 ML |
139 | static void NORETURN daemon_die(const char *err, va_list params) |
140 | { | |
141 | logreport(LOG_ERR, err, params); | |
142 | exit(1); | |
143 | } | |
144 | ||
01cec54e | 145 | static const char *path_ok(const char *directory, struct hostinfo *hi) |
4ae95682 | 146 | { |
603968d2 | 147 | static char rpath[PATH_MAX]; |
49ba83fb | 148 | static char interp_path[PATH_MAX]; |
6bdb0083 | 149 | size_t rlen; |
1c64b48e | 150 | const char *path; |
1055a890 | 151 | const char *dir; |
49ba83fb | 152 | |
9d7ca667 | 153 | dir = directory; |
d79374c7 | 154 | |
34b6cb8b | 155 | if (daemon_avoid_alias(dir)) { |
d79374c7 JH |
156 | logerror("'%s': aliased", dir); |
157 | return NULL; | |
158 | } | |
159 | ||
603968d2 JH |
160 | if (*dir == '~') { |
161 | if (!user_path) { | |
162 | logerror("'%s': User-path not allowed", dir); | |
163 | return NULL; | |
164 | } | |
165 | if (*user_path) { | |
166 | /* Got either "~alice" or "~alice/foo"; | |
167 | * rewrite them to "~alice/%s" or | |
168 | * "~alice/%s/foo". | |
169 | */ | |
170 | int namlen, restlen = strlen(dir); | |
1055a890 | 171 | const char *slash = strchr(dir, '/'); |
603968d2 JH |
172 | if (!slash) |
173 | slash = dir + restlen; | |
174 | namlen = slash - dir; | |
175 | restlen -= namlen; | |
176 | loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash); | |
6bdb0083 JK |
177 | rlen = snprintf(rpath, sizeof(rpath), "%.*s/%s%.*s", |
178 | namlen, dir, user_path, restlen, slash); | |
179 | if (rlen >= sizeof(rpath)) { | |
180 | logerror("user-path too large: %s", rpath); | |
181 | return NULL; | |
182 | } | |
603968d2 JH |
183 | dir = rpath; |
184 | } | |
185 | } | |
01cec54e | 186 | else if (interpolated_path && hi->saw_extended_args) { |
9d7ca667 | 187 | struct strbuf expanded_path = STRBUF_INIT; |
6f1e2d52 | 188 | const char *format = interpolated_path; |
dc8edc8f | 189 | |
49ba83fb JL |
190 | if (*dir != '/') { |
191 | /* Allow only absolute */ | |
192 | logerror("'%s': Non-absolute path denied (interpolated-path active)", dir); | |
193 | return NULL; | |
194 | } | |
195 | ||
6f1e2d52 RS |
196 | while (strbuf_expand_step(&expanded_path, &format)) { |
197 | if (skip_prefix(format, "%", &format)) | |
198 | strbuf_addch(&expanded_path, '%'); | |
199 | else if (skip_prefix(format, "H", &format)) | |
200 | strbuf_addbuf(&expanded_path, &hi->hostname); | |
201 | else if (skip_prefix(format, "CH", &format)) | |
202 | strbuf_addstr(&expanded_path, | |
203 | get_canon_hostname(hi)); | |
204 | else if (skip_prefix(format, "IP", &format)) | |
205 | strbuf_addstr(&expanded_path, | |
206 | get_ip_address(hi)); | |
207 | else if (skip_prefix(format, "P", &format)) | |
208 | strbuf_addbuf(&expanded_path, &hi->tcp_port); | |
209 | else if (skip_prefix(format, "D", &format)) | |
210 | strbuf_addstr(&expanded_path, directory); | |
211 | else | |
212 | strbuf_addch(&expanded_path, '%'); | |
213 | } | |
6bdb0083 JK |
214 | |
215 | rlen = strlcpy(interp_path, expanded_path.buf, | |
216 | sizeof(interp_path)); | |
999bba3e | 217 | strbuf_release(&expanded_path); |
6bdb0083 JK |
218 | if (rlen >= sizeof(interp_path)) { |
219 | logerror("interpolated path too large: %s", | |
220 | interp_path); | |
221 | return NULL; | |
222 | } | |
223 | ||
49ba83fb JL |
224 | loginfo("Interpolated dir '%s'", interp_path); |
225 | ||
226 | dir = interp_path; | |
227 | } | |
603968d2 JH |
228 | else if (base_path) { |
229 | if (*dir != '/') { | |
230 | /* Allow only absolute */ | |
1fda3d55 | 231 | logerror("'%s': Non-absolute path denied (base-path active)", dir); |
b21c31c9 PB |
232 | return NULL; |
233 | } | |
6bdb0083 JK |
234 | rlen = snprintf(rpath, sizeof(rpath), "%s%s", base_path, dir); |
235 | if (rlen >= sizeof(rpath)) { | |
236 | logerror("base-path too large: %s", rpath); | |
237 | return NULL; | |
238 | } | |
49ba83fb | 239 | dir = rpath; |
b21c31c9 PB |
240 | } |
241 | ||
a583971f RS |
242 | path = enter_repo(dir, strict_paths); |
243 | if (!path && base_path && base_path_relaxed) { | |
73a7a656 JA |
244 | /* |
245 | * if we fail and base_path_relaxed is enabled, try without | |
246 | * prefixing the base path | |
247 | */ | |
a583971f RS |
248 | dir = directory; |
249 | path = enter_repo(dir, strict_paths); | |
250 | } | |
3e04c62d | 251 | |
4dbd1352 | 252 | if (!path) { |
05ac6b34 | 253 | logerror("'%s' does not appear to be a git repository", dir); |
4dbd1352 | 254 | return NULL; |
4ae95682 PA |
255 | } |
256 | ||
257 | if ( ok_paths && *ok_paths ) { | |
3f2e2297 | 258 | const char **pp; |
4dbd1352 | 259 | int pathlen = strlen(path); |
4ae95682 | 260 | |
ce335fe0 | 261 | /* The validation is done on the paths after enter_repo |
a6080a0a | 262 | * appends optional {.git,.git/.git} and friends, but |
d79374c7 | 263 | * it does not use getcwd(). So if your /pub is |
dee8a145 | 264 | * a symlink to /mnt/pub, you can include /pub and |
d79374c7 JH |
265 | * do not have to say /mnt/pub. |
266 | * Do not say /pub/. | |
ce335fe0 | 267 | */ |
4ae95682 PA |
268 | for ( pp = ok_paths ; *pp ; pp++ ) { |
269 | int len = strlen(*pp); | |
ce335fe0 JH |
270 | if (len <= pathlen && |
271 | !memcmp(*pp, path, len) && | |
272 | (path[len] == '\0' || | |
273 | (!strict_paths && path[len] == '/'))) | |
274 | return path; | |
4ae95682 | 275 | } |
4dbd1352 AE |
276 | } |
277 | else { | |
278 | /* be backwards compatible */ | |
279 | if (!strict_paths) | |
280 | return path; | |
4ae95682 PA |
281 | } |
282 | ||
dee8a145 | 283 | logerror("'%s': not in directory list", path); |
4dbd1352 | 284 | return NULL; /* Fallthrough. Deny by default */ |
4ae95682 | 285 | } |
a87e8be2 | 286 | |
ef8d7ac4 | 287 | typedef int (*daemon_service_fn)(const struct strvec *env); |
d819e4e6 JH |
288 | struct daemon_service { |
289 | const char *name; | |
290 | const char *config_name; | |
291 | daemon_service_fn fn; | |
292 | int enabled; | |
293 | int overridable; | |
294 | }; | |
295 | ||
d5570f4d JK |
296 | static int daemon_error(const char *dir, const char *msg) |
297 | { | |
298 | if (!informative_errors) | |
299 | msg = "access denied or repository not exported"; | |
81c634e9 | 300 | packet_write_fmt(1, "ERR %s: %s", msg, dir); |
d5570f4d JK |
301 | return -1; |
302 | } | |
303 | ||
1055a890 | 304 | static const char *access_hook; |
93741e4a | 305 | |
01cec54e RS |
306 | static int run_access_hook(struct daemon_service *service, const char *dir, |
307 | const char *path, struct hostinfo *hi) | |
93741e4a | 308 | { |
d3180279 | 309 | struct child_process child = CHILD_PROCESS_INIT; |
93741e4a | 310 | struct strbuf buf = STRBUF_INIT; |
93741e4a JH |
311 | char *eol; |
312 | int seen_errors = 0; | |
313 | ||
7f14609e ÆAB |
314 | strvec_push(&child.args, access_hook); |
315 | strvec_push(&child.args, service->name); | |
316 | strvec_push(&child.args, path); | |
317 | strvec_push(&child.args, hi->hostname.buf); | |
318 | strvec_push(&child.args, get_canon_hostname(hi)); | |
319 | strvec_push(&child.args, get_ip_address(hi)); | |
320 | strvec_push(&child.args, hi->tcp_port.buf); | |
93741e4a | 321 | |
93741e4a | 322 | child.use_shell = 1; |
93741e4a JH |
323 | child.no_stdin = 1; |
324 | child.no_stderr = 1; | |
325 | child.out = -1; | |
326 | if (start_command(&child)) { | |
327 | logerror("daemon access hook '%s' failed to start", | |
328 | access_hook); | |
329 | goto error_return; | |
330 | } | |
331 | if (strbuf_read(&buf, child.out, 0) < 0) { | |
332 | logerror("failed to read from pipe to daemon access hook '%s'", | |
333 | access_hook); | |
334 | strbuf_reset(&buf); | |
335 | seen_errors = 1; | |
336 | } | |
337 | if (close(child.out) < 0) { | |
338 | logerror("failed to close pipe to daemon access hook '%s'", | |
339 | access_hook); | |
340 | seen_errors = 1; | |
341 | } | |
342 | if (finish_command(&child)) | |
343 | seen_errors = 1; | |
344 | ||
345 | if (!seen_errors) { | |
346 | strbuf_release(&buf); | |
347 | return 0; | |
348 | } | |
349 | ||
350 | error_return: | |
351 | strbuf_ltrim(&buf); | |
352 | if (!buf.len) | |
353 | strbuf_addstr(&buf, "service rejected"); | |
354 | eol = strchr(buf.buf, '\n'); | |
355 | if (eol) | |
356 | *eol = '\0'; | |
357 | errno = EACCES; | |
358 | daemon_error(dir, buf.buf); | |
359 | strbuf_release(&buf); | |
360 | return -1; | |
361 | } | |
362 | ||
01cec54e | 363 | static int run_service(const char *dir, struct daemon_service *service, |
ef8d7ac4 | 364 | struct hostinfo *hi, const struct strvec *env) |
a87e8be2 | 365 | { |
4dbd1352 | 366 | const char *path; |
d819e4e6 | 367 | int enabled = service->enabled; |
8939d32d | 368 | struct strbuf var = STRBUF_INIT; |
d819e4e6 | 369 | |
a47551c3 | 370 | loginfo("Request %s for '%s'", service->name, dir); |
4dbd1352 | 371 | |
d819e4e6 JH |
372 | if (!enabled && !service->overridable) { |
373 | logerror("'%s': service not enabled.", service->name); | |
374 | errno = EACCES; | |
d5570f4d | 375 | return daemon_error(dir, "service not enabled"); |
d819e4e6 | 376 | } |
4ae95682 | 377 | |
01cec54e | 378 | if (!(path = path_ok(dir, hi))) |
d5570f4d | 379 | return daemon_error(dir, "no such repository"); |
47888f0f | 380 | |
a87e8be2 LT |
381 | /* |
382 | * Security on the cheap. | |
383 | * | |
a935c397 | 384 | * We want a readable HEAD, usable "objects" directory, and |
a87e8be2 LT |
385 | * a "git-daemon-export-ok" flag that says that the other side |
386 | * is ok with us doing this. | |
4dbd1352 | 387 | * |
dee8a145 | 388 | * path_ok() uses enter_repo() and checks for included directories. |
4dbd1352 | 389 | * We only need to make sure the repository is exported. |
a87e8be2 | 390 | */ |
4dbd1352 | 391 | |
3e04c62d | 392 | if (!export_all_trees && access("git-daemon-export-ok", F_OK)) { |
4dbd1352 | 393 | logerror("'%s': repository not exported.", path); |
3e04c62d | 394 | errno = EACCES; |
d5570f4d | 395 | return daemon_error(dir, "repository not exported"); |
3e04c62d PA |
396 | } |
397 | ||
d819e4e6 | 398 | if (service->overridable) { |
8939d32d TA |
399 | strbuf_addf(&var, "daemon.%s", service->config_name); |
400 | git_config_get_bool(var.buf, &enabled); | |
401 | strbuf_release(&var); | |
d819e4e6 JH |
402 | } |
403 | if (!enabled) { | |
404 | logerror("'%s': service not enabled for '%s'", | |
405 | service->name, path); | |
406 | errno = EACCES; | |
d5570f4d | 407 | return daemon_error(dir, "service not enabled"); |
d819e4e6 JH |
408 | } |
409 | ||
93741e4a JH |
410 | /* |
411 | * Optionally, a hook can choose to deny access to the | |
412 | * repository depending on the phase of the moon. | |
413 | */ | |
01cec54e | 414 | if (access_hook && run_access_hook(service, dir, path, hi)) |
93741e4a JH |
415 | return -1; |
416 | ||
02d57da4 LT |
417 | /* |
418 | * We'll ignore SIGTERM from now on, we have a | |
419 | * good client. | |
420 | */ | |
421 | signal(SIGTERM, SIG_IGN); | |
422 | ||
dfe422d0 | 423 | return service->fn(env); |
d819e4e6 JH |
424 | } |
425 | ||
5d87dd4f JS |
426 | static void copy_to_log(int fd) |
427 | { | |
428 | struct strbuf line = STRBUF_INIT; | |
429 | FILE *fp; | |
430 | ||
431 | fp = fdopen(fd, "r"); | |
afe8a907 | 432 | if (!fp) { |
5d87dd4f JS |
433 | logerror("fdopen of error channel failed"); |
434 | close(fd); | |
435 | return; | |
436 | } | |
437 | ||
8f309aeb | 438 | while (strbuf_getline_lf(&line, fp) != EOF) { |
5d87dd4f JS |
439 | logerror("%s", line.buf); |
440 | strbuf_setlen(&line, 0); | |
441 | } | |
442 | ||
443 | strbuf_release(&line); | |
444 | fclose(fp); | |
445 | } | |
446 | ||
6a97da39 | 447 | static int run_service_command(struct child_process *cld) |
5d87dd4f | 448 | { |
ef8d7ac4 | 449 | strvec_push(&cld->args, "."); |
6a97da39 JK |
450 | cld->git_cmd = 1; |
451 | cld->err = -1; | |
452 | if (start_command(cld)) | |
5d87dd4f JS |
453 | return -1; |
454 | ||
455 | close(0); | |
456 | close(1); | |
457 | ||
6a97da39 | 458 | copy_to_log(cld->err); |
5d87dd4f | 459 | |
6a97da39 | 460 | return finish_command(cld); |
5d87dd4f JS |
461 | } |
462 | ||
ef8d7ac4 | 463 | static int upload_pack(const struct strvec *env) |
d819e4e6 | 464 | { |
6a97da39 | 465 | struct child_process cld = CHILD_PROCESS_INIT; |
ef8d7ac4 JK |
466 | strvec_pushl(&cld.args, "upload-pack", "--strict", NULL); |
467 | strvec_pushf(&cld.args, "--timeout=%u", timeout); | |
dfe422d0 | 468 | |
29fda24d | 469 | strvec_pushv(&cld.env, env->v); |
dfe422d0 | 470 | |
6a97da39 | 471 | return run_service_command(&cld); |
a87e8be2 LT |
472 | } |
473 | ||
ef8d7ac4 | 474 | static int upload_archive(const struct strvec *env) |
39345a21 | 475 | { |
6a97da39 | 476 | struct child_process cld = CHILD_PROCESS_INIT; |
ef8d7ac4 | 477 | strvec_push(&cld.args, "upload-archive"); |
dfe422d0 | 478 | |
29fda24d | 479 | strvec_pushv(&cld.env, env->v); |
dfe422d0 | 480 | |
6a97da39 | 481 | return run_service_command(&cld); |
39345a21 FBH |
482 | } |
483 | ||
ef8d7ac4 | 484 | static int receive_pack(const struct strvec *env) |
4b3b1e1e | 485 | { |
6a97da39 | 486 | struct child_process cld = CHILD_PROCESS_INIT; |
ef8d7ac4 | 487 | strvec_push(&cld.args, "receive-pack"); |
dfe422d0 | 488 | |
29fda24d | 489 | strvec_pushv(&cld.env, env->v); |
dfe422d0 | 490 | |
6a97da39 | 491 | return run_service_command(&cld); |
4b3b1e1e LT |
492 | } |
493 | ||
d819e4e6 | 494 | static struct daemon_service daemon_service[] = { |
39345a21 | 495 | { "upload-archive", "uploadarch", upload_archive, 0, 1 }, |
d819e4e6 | 496 | { "upload-pack", "uploadpack", upload_pack, 1, 1 }, |
4b3b1e1e | 497 | { "receive-pack", "receivepack", receive_pack, 0, 1 }, |
d819e4e6 JH |
498 | }; |
499 | ||
f3fa1838 JH |
500 | static void enable_service(const char *name, int ena) |
501 | { | |
d819e4e6 JH |
502 | int i; |
503 | for (i = 0; i < ARRAY_SIZE(daemon_service); i++) { | |
504 | if (!strcmp(daemon_service[i].name, name)) { | |
505 | daemon_service[i].enabled = ena; | |
506 | return; | |
507 | } | |
508 | } | |
509 | die("No such service %s", name); | |
510 | } | |
511 | ||
f3fa1838 JH |
512 | static void make_service_overridable(const char *name, int ena) |
513 | { | |
d819e4e6 JH |
514 | int i; |
515 | for (i = 0; i < ARRAY_SIZE(daemon_service); i++) { | |
516 | if (!strcmp(daemon_service[i].name, name)) { | |
517 | daemon_service[i].overridable = ena; | |
518 | return; | |
519 | } | |
520 | } | |
521 | die("No such service %s", name); | |
522 | } | |
523 | ||
e8dbd76d IL |
524 | static void parse_host_and_port(char *hostport, char **host, |
525 | char **port) | |
526 | { | |
527 | if (*hostport == '[') { | |
528 | char *end; | |
529 | ||
530 | end = strchr(hostport, ']'); | |
531 | if (!end) | |
9517e6b8 | 532 | die("Invalid request ('[' without ']')"); |
e8dbd76d IL |
533 | *end = '\0'; |
534 | *host = hostport + 1; | |
535 | if (!end[1]) | |
536 | *port = NULL; | |
537 | else if (end[1] == ':') | |
538 | *port = end + 2; | |
539 | else | |
540 | die("Garbage after end of host part"); | |
541 | } else { | |
542 | *host = hostport; | |
543 | *port = strrchr(hostport, ':'); | |
544 | if (*port) { | |
e9bd3235 | 545 | **port = '\0'; |
e8dbd76d IL |
546 | ++*port; |
547 | } | |
548 | } | |
549 | } | |
550 | ||
b4853730 JK |
551 | /* |
552 | * Sanitize a string from the client so that it's OK to be inserted into a | |
9a7f1ce8 RS |
553 | * filesystem path. Specifically, we disallow directory separators, runs |
554 | * of "..", and trailing and leading dots, which means that the client | |
555 | * cannot escape our base path via ".." traversal. | |
b4853730 | 556 | */ |
7a646cec | 557 | static void sanitize_client(struct strbuf *out, const char *in) |
b4853730 JK |
558 | { |
559 | for (; *in; in++) { | |
9a7f1ce8 | 560 | if (is_dir_sep(*in)) |
b4853730 JK |
561 | continue; |
562 | if (*in == '.' && (!out->len || out->buf[out->len - 1] == '.')) | |
563 | continue; | |
564 | strbuf_addch(out, *in); | |
565 | } | |
566 | ||
567 | while (out->len && out->buf[out->len - 1] == '.') | |
568 | strbuf_setlen(out, out->len - 1); | |
569 | } | |
570 | ||
b4853730 JK |
571 | /* |
572 | * Like sanitize_client, but we also perform any canonicalization | |
573 | * to make life easier on the admin. | |
574 | */ | |
7a646cec | 575 | static void canonicalize_client(struct strbuf *out, const char *in) |
b4853730 | 576 | { |
7a646cec RS |
577 | sanitize_client(out, in); |
578 | strbuf_tolower(out); | |
b4853730 JK |
579 | } |
580 | ||
eb30aed7 | 581 | /* |
73bb33a9 | 582 | * Read the host as supplied by the client connection. |
dfe422d0 BW |
583 | * |
584 | * Returns a pointer to the character after the NUL byte terminating the host | |
15beaaa3 | 585 | * argument, or 'extra_args' if there is no host argument. |
eb30aed7 | 586 | */ |
dfe422d0 | 587 | static char *parse_host_arg(struct hostinfo *hi, char *extra_args, int buflen) |
49ba83fb JL |
588 | { |
589 | char *val; | |
590 | int vallen; | |
591 | char *end = extra_args + buflen; | |
592 | ||
73bb33a9 | 593 | if (extra_args < end && *extra_args) { |
01cec54e | 594 | hi->saw_extended_args = 1; |
49ba83fb JL |
595 | if (strncasecmp("host=", extra_args, 5) == 0) { |
596 | val = extra_args + 5; | |
597 | vallen = strlen(val) + 1; | |
550fbcad | 598 | loginfo("Extended attribute \"host\": %s", val); |
49ba83fb | 599 | if (*val) { |
eb30aed7 | 600 | /* Split <host>:<port> at colon. */ |
e8dbd76d IL |
601 | char *host; |
602 | char *port; | |
603 | parse_host_and_port(val, &host, &port); | |
01cec54e RS |
604 | if (port) |
605 | sanitize_client(&hi->tcp_port, port); | |
606 | canonicalize_client(&hi->hostname, host); | |
607 | hi->hostname_lookup_done = 0; | |
49ba83fb | 608 | } |
eb30aed7 | 609 | |
49ba83fb JL |
610 | /* On to the next one */ |
611 | extra_args = val + vallen; | |
612 | } | |
73bb33a9 SP |
613 | if (extra_args < end && *extra_args) |
614 | die("Invalid request"); | |
49ba83fb | 615 | } |
dfe422d0 BW |
616 | |
617 | return extra_args; | |
618 | } | |
619 | ||
ef8d7ac4 | 620 | static void parse_extra_args(struct hostinfo *hi, struct strvec *env, |
dfe422d0 BW |
621 | char *extra_args, int buflen) |
622 | { | |
623 | const char *end = extra_args + buflen; | |
624 | struct strbuf git_protocol = STRBUF_INIT; | |
625 | ||
626 | /* First look for the host argument */ | |
627 | extra_args = parse_host_arg(hi, extra_args, buflen); | |
628 | ||
629 | /* Look for additional arguments places after a second NUL byte */ | |
630 | for (; extra_args < end; extra_args += strlen(extra_args) + 1) { | |
631 | const char *arg = extra_args; | |
632 | ||
633 | /* | |
634 | * Parse the extra arguments, adding most to 'git_protocol' | |
635 | * which will be used to set the 'GIT_PROTOCOL' envvar in the | |
636 | * service that will be run. | |
637 | * | |
638 | * If there ends up being a particular arg in the future that | |
15beaaa3 | 639 | * git-daemon needs to parse specifically (like the 'host' arg) |
dfe422d0 BW |
640 | * then it can be parsed here and not added to 'git_protocol'. |
641 | */ | |
642 | if (*arg) { | |
643 | if (git_protocol.len > 0) | |
644 | strbuf_addch(&git_protocol, ':'); | |
645 | strbuf_addstr(&git_protocol, arg); | |
646 | } | |
647 | } | |
648 | ||
550fbcad JK |
649 | if (git_protocol.len > 0) { |
650 | loginfo("Extended attribute \"protocol\": %s", git_protocol.buf); | |
ef8d7ac4 | 651 | strvec_pushf(env, GIT_PROTOCOL_ENVIRONMENT "=%s", |
f6d8942b | 652 | git_protocol.buf); |
550fbcad | 653 | } |
dfe422d0 | 654 | strbuf_release(&git_protocol); |
edef953e | 655 | } |
dd467629 | 656 | |
edef953e RS |
657 | /* |
658 | * Locate canonical hostname and its IP address. | |
659 | */ | |
01cec54e | 660 | static void lookup_hostname(struct hostinfo *hi) |
edef953e | 661 | { |
01cec54e | 662 | if (!hi->hostname_lookup_done && hi->hostname.len) { |
dd467629 | 663 | #ifndef NO_IPV6 |
dd467629 | 664 | struct addrinfo hints; |
3e8a00ae | 665 | struct addrinfo *ai; |
dd467629 JL |
666 | int gai; |
667 | static char addrbuf[HOST_NAME_MAX + 1]; | |
668 | ||
669 | memset(&hints, 0, sizeof(hints)); | |
670 | hints.ai_flags = AI_CANONNAME; | |
671 | ||
01cec54e | 672 | gai = getaddrinfo(hi->hostname.buf, NULL, &hints, &ai); |
dd467629 | 673 | if (!gai) { |
3e8a00ae BK |
674 | struct sockaddr_in *sin_addr = (void *)ai->ai_addr; |
675 | ||
676 | inet_ntop(AF_INET, &sin_addr->sin_addr, | |
677 | addrbuf, sizeof(addrbuf)); | |
01cec54e | 678 | strbuf_addstr(&hi->ip_address, addrbuf); |
3e8a00ae | 679 | |
7a646cec | 680 | if (ai->ai_canonname) |
01cec54e | 681 | sanitize_client(&hi->canon_hostname, |
7a646cec RS |
682 | ai->ai_canonname); |
683 | else | |
01cec54e RS |
684 | strbuf_addbuf(&hi->canon_hostname, |
685 | &hi->ip_address); | |
3e8a00ae BK |
686 | |
687 | freeaddrinfo(ai); | |
dd467629 | 688 | } |
dd467629 | 689 | #else |
dd467629 JL |
690 | struct hostent *hent; |
691 | struct sockaddr_in sa; | |
692 | char **ap; | |
693 | static char addrbuf[HOST_NAME_MAX + 1]; | |
694 | ||
d358f771 | 695 | hent = gethostbyname(hi->hostname.buf); |
eb6c4035 RS |
696 | if (hent) { |
697 | ap = hent->h_addr_list; | |
698 | memset(&sa, 0, sizeof sa); | |
699 | sa.sin_family = hent->h_addrtype; | |
700 | sa.sin_port = htons(0); | |
701 | memcpy(&sa.sin_addr, *ap, hent->h_length); | |
702 | ||
703 | inet_ntop(hent->h_addrtype, &sa.sin_addr, | |
704 | addrbuf, sizeof(addrbuf)); | |
dd467629 | 705 | |
01cec54e RS |
706 | sanitize_client(&hi->canon_hostname, hent->h_name); |
707 | strbuf_addstr(&hi->ip_address, addrbuf); | |
eb6c4035 | 708 | } |
dd467629 | 709 | #endif |
01cec54e | 710 | hi->hostname_lookup_done = 1; |
6720e95b | 711 | } |
dd467629 JL |
712 | } |
713 | ||
01cec54e RS |
714 | static void hostinfo_clear(struct hostinfo *hi) |
715 | { | |
716 | strbuf_release(&hi->hostname); | |
717 | strbuf_release(&hi->canon_hostname); | |
718 | strbuf_release(&hi->ip_address); | |
719 | strbuf_release(&hi->tcp_port); | |
720 | } | |
dd467629 | 721 | |
a43b68a1 EW |
722 | static void set_keep_alive(int sockfd) |
723 | { | |
724 | int ka = 1; | |
725 | ||
49c58d86 EW |
726 | if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0) { |
727 | if (errno != ENOTSOCK) | |
728 | logerror("unable to set SO_KEEPALIVE on socket: %s", | |
729 | strerror(errno)); | |
730 | } | |
a43b68a1 EW |
731 | } |
732 | ||
f9c87be6 | 733 | static int execute(void) |
a87e8be2 | 734 | { |
74543a04 | 735 | char *line = packet_buffer; |
d819e4e6 | 736 | int pktlen, len, i; |
f9c87be6 | 737 | char *addr = getenv("REMOTE_ADDR"), *port = getenv("REMOTE_PORT"); |
6e54a324 | 738 | struct hostinfo hi = HOSTINFO_INIT; |
ef8d7ac4 | 739 | struct strvec env = STRVEC_INIT; |
01cec54e | 740 | |
f9c87be6 EFL |
741 | if (addr) |
742 | loginfo("Connection from %s:%s", addr, port); | |
5b276ee4 | 743 | |
a43b68a1 | 744 | set_keep_alive(0); |
960deccb | 745 | alarm(init_timeout ? init_timeout : timeout); |
ec9a37d6 | 746 | pktlen = packet_read(0, packet_buffer, sizeof(packet_buffer), 0); |
960deccb | 747 | alarm(0); |
7d80694a | 748 | |
5ad312be | 749 | len = strlen(line); |
ed15e58e JK |
750 | if (len && line[len-1] == '\n') |
751 | line[len-1] = 0; | |
7d80694a | 752 | |
dfe422d0 | 753 | /* parse additional args hidden behind a NUL byte */ |
d433ed0b | 754 | if (len != pktlen) |
dfe422d0 | 755 | parse_extra_args(&hi, &env, line + len + 1, pktlen - len - 1); |
49ba83fb | 756 | |
d819e4e6 JH |
757 | for (i = 0; i < ARRAY_SIZE(daemon_service); i++) { |
758 | struct daemon_service *s = &(daemon_service[i]); | |
d12c24d2 JK |
759 | const char *arg; |
760 | ||
761 | if (skip_prefix(line, "git-", &arg) && | |
762 | skip_prefix(arg, s->name, &arg) && | |
763 | *arg++ == ' ') { | |
eb30aed7 JL |
764 | /* |
765 | * Note: The directory here is probably context sensitive, | |
766 | * and might depend on the actual service being performed. | |
767 | */ | |
dfe422d0 | 768 | int rc = run_service(arg, s, &hi, &env); |
01cec54e | 769 | hostinfo_clear(&hi); |
ef8d7ac4 | 770 | strvec_clear(&env); |
01cec54e | 771 | return rc; |
49ba83fb | 772 | } |
d819e4e6 | 773 | } |
a87e8be2 | 774 | |
01cec54e | 775 | hostinfo_clear(&hi); |
ef8d7ac4 | 776 | strvec_clear(&env); |
f8ff0c06 | 777 | logerror("Protocol error: '%s'", line); |
a87e8be2 LT |
778 | return -1; |
779 | } | |
780 | ||
15515b73 EFL |
781 | static int addrcmp(const struct sockaddr_storage *s1, |
782 | const struct sockaddr_storage *s2) | |
783 | { | |
3aff874a BC |
784 | const struct sockaddr *sa1 = (const struct sockaddr*) s1; |
785 | const struct sockaddr *sa2 = (const struct sockaddr*) s2; | |
786 | ||
787 | if (sa1->sa_family != sa2->sa_family) | |
788 | return sa1->sa_family - sa2->sa_family; | |
789 | if (sa1->sa_family == AF_INET) | |
15515b73 EFL |
790 | return memcmp(&((struct sockaddr_in *)s1)->sin_addr, |
791 | &((struct sockaddr_in *)s2)->sin_addr, | |
792 | sizeof(struct in_addr)); | |
793 | #ifndef NO_IPV6 | |
3aff874a | 794 | if (sa1->sa_family == AF_INET6) |
15515b73 EFL |
795 | return memcmp(&((struct sockaddr_in6 *)s1)->sin6_addr, |
796 | &((struct sockaddr_in6 *)s2)->sin6_addr, | |
797 | sizeof(struct in6_addr)); | |
798 | #endif | |
799 | return 0; | |
800 | } | |
801 | ||
3bd62c21 | 802 | static int max_connections = 32; |
66e631de | 803 | |
3bd62c21 | 804 | static unsigned int live_children; |
66e631de | 805 | |
4d8fa916 | 806 | static struct child { |
3bd62c21 | 807 | struct child *next; |
30e15602 | 808 | struct child_process cld; |
df076bdb | 809 | struct sockaddr_storage address; |
3bd62c21 | 810 | } *firstborn; |
66e631de | 811 | |
c295cf06 | 812 | static void add_child(struct child_process *cld, struct sockaddr *addr, socklen_t addrlen) |
66e631de | 813 | { |
460c2010 JH |
814 | struct child *newborn, **cradle; |
815 | ||
ca56dadb | 816 | CALLOC_ARRAY(newborn, 1); |
460c2010 | 817 | live_children++; |
30e15602 | 818 | memcpy(&newborn->cld, cld, sizeof(*cld)); |
460c2010 JH |
819 | memcpy(&newborn->address, addr, addrlen); |
820 | for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next) | |
15515b73 | 821 | if (!addrcmp(&(*cradle)->address, &newborn->address)) |
460c2010 JH |
822 | break; |
823 | newborn->next = *cradle; | |
824 | *cradle = newborn; | |
66e631de LT |
825 | } |
826 | ||
66e631de LT |
827 | /* |
828 | * This gets called if the number of connections grows | |
829 | * past "max_connections". | |
830 | * | |
3bd62c21 | 831 | * We kill the newest connection from a duplicate IP. |
66e631de | 832 | */ |
3bd62c21 | 833 | static void kill_some_child(void) |
66e631de | 834 | { |
460c2010 | 835 | const struct child *blanket, *next; |
66e631de | 836 | |
460c2010 JH |
837 | if (!(blanket = firstborn)) |
838 | return; | |
695605b5 | 839 | |
460c2010 | 840 | for (; (next = blanket->next); blanket = next) |
15515b73 | 841 | if (!addrcmp(&blanket->address, &next->address)) { |
30e15602 | 842 | kill(blanket->cld.pid, SIGTERM); |
460c2010 JH |
843 | break; |
844 | } | |
a5a9126b JS |
845 | } |
846 | ||
3bd62c21 | 847 | static void check_dead_children(void) |
a87e8be2 | 848 | { |
3bd62c21 SB |
849 | int status; |
850 | pid_t pid; | |
02d57da4 | 851 | |
30e15602 EFL |
852 | struct child **cradle, *blanket; |
853 | for (cradle = &firstborn; (blanket = *cradle);) | |
854 | if ((pid = waitpid(blanket->cld.pid, &status, WNOHANG)) > 1) { | |
855 | const char *dead = ""; | |
856 | if (status) | |
857 | dead = " (with error)"; | |
858 | loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead); | |
859 | ||
860 | /* remove the child */ | |
861 | *cradle = blanket->next; | |
862 | live_children--; | |
b1b49ff8 | 863 | child_process_clear(&blanket->cld); |
30e15602 EFL |
864 | free(blanket); |
865 | } else | |
866 | cradle = &blanket->next; | |
02d57da4 LT |
867 | } |
868 | ||
ef8d7ac4 | 869 | static struct strvec cld_argv = STRVEC_INIT; |
c295cf06 | 870 | static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen) |
02d57da4 | 871 | { |
d3180279 | 872 | struct child_process cld = CHILD_PROCESS_INIT; |
02d57da4 | 873 | |
3bd62c21 SB |
874 | if (max_connections && live_children >= max_connections) { |
875 | kill_some_child(); | |
460c2010 | 876 | sleep(1); /* give it some time to die */ |
3bd62c21 SB |
877 | check_dead_children(); |
878 | if (live_children >= max_connections) { | |
879 | close(incoming); | |
880 | logerror("Too many children, dropping connection"); | |
881 | return; | |
882 | } | |
883 | } | |
02d57da4 | 884 | |
f9c87be6 | 885 | if (addr->sa_family == AF_INET) { |
f063d38b | 886 | char buf[128] = ""; |
f9c87be6 | 887 | struct sockaddr_in *sin_addr = (void *) addr; |
f063d38b | 888 | inet_ntop(addr->sa_family, &sin_addr->sin_addr, buf, sizeof(buf)); |
29fda24d ÆAB |
889 | strvec_pushf(&cld.env, "REMOTE_ADDR=%s", buf); |
890 | strvec_pushf(&cld.env, "REMOTE_PORT=%d", | |
f6d8942b | 891 | ntohs(sin_addr->sin_port)); |
f9c87be6 | 892 | #ifndef NO_IPV6 |
5d9cfa29 | 893 | } else if (addr->sa_family == AF_INET6) { |
f063d38b | 894 | char buf[128] = ""; |
f9c87be6 | 895 | struct sockaddr_in6 *sin6_addr = (void *) addr; |
f063d38b | 896 | inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(buf)); |
29fda24d ÆAB |
897 | strvec_pushf(&cld.env, "REMOTE_ADDR=[%s]", buf); |
898 | strvec_pushf(&cld.env, "REMOTE_PORT=%d", | |
f6d8942b | 899 | ntohs(sin6_addr->sin6_port)); |
f9c87be6 EFL |
900 | #endif |
901 | } | |
902 | ||
6def0ff8 | 903 | strvec_pushv(&cld.args, cld_argv.v); |
30e15602 EFL |
904 | cld.in = incoming; |
905 | cld.out = dup(incoming); | |
a87e8be2 | 906 | |
30e15602 EFL |
907 | if (start_command(&cld)) |
908 | logerror("unable to fork"); | |
909 | else | |
910 | add_child(&cld, addr, addrlen); | |
a87e8be2 LT |
911 | } |
912 | ||
9ec03b59 | 913 | static void child_handler(int signo UNUSED) |
eaa94919 | 914 | { |
460c2010 JH |
915 | /* |
916 | * Otherwise empty handler because systemcalls will get interrupted | |
695605b5 SB |
917 | * upon signal receipt |
918 | * SysV needs the handler to be rearmed | |
919 | */ | |
bd7b371e | 920 | signal(SIGCHLD, child_handler); |
eaa94919 LT |
921 | } |
922 | ||
1955fabf MW |
923 | static int set_reuse_addr(int sockfd) |
924 | { | |
925 | int on = 1; | |
926 | ||
927 | if (!reuseaddr) | |
928 | return 0; | |
929 | return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, | |
930 | &on, sizeof(on)); | |
931 | } | |
932 | ||
2caa3215 AS |
933 | struct socketlist { |
934 | int *list; | |
935 | size_t nr; | |
936 | size_t alloc; | |
937 | }; | |
938 | ||
089d82e8 NTND |
939 | static const char *ip2str(int family, struct sockaddr *sin, socklen_t len) |
940 | { | |
941 | #ifdef NO_IPV6 | |
942 | static char ip[INET_ADDRSTRLEN]; | |
943 | #else | |
944 | static char ip[INET6_ADDRSTRLEN]; | |
945 | #endif | |
946 | ||
947 | switch (family) { | |
948 | #ifndef NO_IPV6 | |
949 | case AF_INET6: | |
950 | inet_ntop(family, &((struct sockaddr_in6*)sin)->sin6_addr, ip, len); | |
951 | break; | |
952 | #endif | |
953 | case AF_INET: | |
954 | inet_ntop(family, &((struct sockaddr_in*)sin)->sin_addr, ip, len); | |
955 | break; | |
956 | default: | |
5096d490 | 957 | xsnprintf(ip, sizeof(ip), "<unknown>"); |
089d82e8 NTND |
958 | } |
959 | return ip; | |
960 | } | |
961 | ||
6573faff PA |
962 | #ifndef NO_IPV6 |
963 | ||
2caa3215 | 964 | static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist) |
a87e8be2 | 965 | { |
2caa3215 | 966 | int socknum = 0; |
df076bdb | 967 | char pbuf[NI_MAXSERV]; |
6573faff PA |
968 | struct addrinfo hints, *ai0, *ai; |
969 | int gai; | |
20276889 | 970 | long flags; |
df076bdb | 971 | |
5096d490 | 972 | xsnprintf(pbuf, sizeof(pbuf), "%d", listen_port); |
df076bdb YH |
973 | memset(&hints, 0, sizeof(hints)); |
974 | hints.ai_family = AF_UNSPEC; | |
975 | hints.ai_socktype = SOCK_STREAM; | |
976 | hints.ai_protocol = IPPROTO_TCP; | |
977 | hints.ai_flags = AI_PASSIVE; | |
978 | ||
dd467629 | 979 | gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0); |
2caa3215 AS |
980 | if (gai) { |
981 | logerror("getaddrinfo() for %s failed: %s", listen_addr, gai_strerror(gai)); | |
982 | return 0; | |
983 | } | |
df076bdb | 984 | |
df076bdb YH |
985 | for (ai = ai0; ai; ai = ai->ai_next) { |
986 | int sockfd; | |
df076bdb YH |
987 | |
988 | sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); | |
989 | if (sockfd < 0) | |
990 | continue; | |
991 | if (sockfd >= FD_SETSIZE) { | |
df0daf8a | 992 | logerror("Socket descriptor too large"); |
df076bdb YH |
993 | close(sockfd); |
994 | continue; | |
995 | } | |
996 | ||
997 | #ifdef IPV6_V6ONLY | |
998 | if (ai->ai_family == AF_INET6) { | |
999 | int on = 1; | |
1000 | setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY, | |
1001 | &on, sizeof(on)); | |
1002 | /* Note: error is not fatal */ | |
1003 | } | |
1004 | #endif | |
1005 | ||
1955fabf | 1006 | if (set_reuse_addr(sockfd)) { |
089d82e8 | 1007 | logerror("Could not set SO_REUSEADDR: %s", strerror(errno)); |
1955fabf | 1008 | close(sockfd); |
0032d548 | 1009 | continue; |
1955fabf MW |
1010 | } |
1011 | ||
a43b68a1 EW |
1012 | set_keep_alive(sockfd); |
1013 | ||
df076bdb | 1014 | if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) { |
089d82e8 NTND |
1015 | logerror("Could not bind to %s: %s", |
1016 | ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen), | |
1017 | strerror(errno)); | |
df076bdb YH |
1018 | close(sockfd); |
1019 | continue; /* not fatal */ | |
1020 | } | |
1021 | if (listen(sockfd, 5) < 0) { | |
089d82e8 NTND |
1022 | logerror("Could not listen to %s: %s", |
1023 | ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen), | |
1024 | strerror(errno)); | |
df076bdb YH |
1025 | close(sockfd); |
1026 | continue; /* not fatal */ | |
1027 | } | |
1028 | ||
20276889 AJ |
1029 | flags = fcntl(sockfd, F_GETFD, 0); |
1030 | if (flags >= 0) | |
1031 | fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC); | |
1032 | ||
2caa3215 AS |
1033 | ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc); |
1034 | socklist->list[socklist->nr++] = sockfd; | |
1035 | socknum++; | |
df076bdb YH |
1036 | } |
1037 | ||
1038 | freeaddrinfo(ai0); | |
1039 | ||
6573faff PA |
1040 | return socknum; |
1041 | } | |
1042 | ||
1043 | #else /* NO_IPV6 */ | |
1044 | ||
2caa3215 | 1045 | static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist) |
6573faff PA |
1046 | { |
1047 | struct sockaddr_in sin; | |
1048 | int sockfd; | |
20276889 | 1049 | long flags; |
6573faff | 1050 | |
dd467629 JL |
1051 | memset(&sin, 0, sizeof sin); |
1052 | sin.sin_family = AF_INET; | |
1053 | sin.sin_port = htons(listen_port); | |
1054 | ||
1055 | if (listen_addr) { | |
1056 | /* Well, host better be an IP address here. */ | |
1057 | if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0) | |
1058 | return 0; | |
1059 | } else { | |
1060 | sin.sin_addr.s_addr = htonl(INADDR_ANY); | |
1061 | } | |
1062 | ||
6573faff PA |
1063 | sockfd = socket(AF_INET, SOCK_STREAM, 0); |
1064 | if (sockfd < 0) | |
1065 | return 0; | |
1066 | ||
1955fabf | 1067 | if (set_reuse_addr(sockfd)) { |
089d82e8 | 1068 | logerror("Could not set SO_REUSEADDR: %s", strerror(errno)); |
1955fabf MW |
1069 | close(sockfd); |
1070 | return 0; | |
1071 | } | |
1072 | ||
a43b68a1 EW |
1073 | set_keep_alive(sockfd); |
1074 | ||
6573faff | 1075 | if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) { |
9d1b9aa9 | 1076 | logerror("Could not bind to %s: %s", |
089d82e8 NTND |
1077 | ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)), |
1078 | strerror(errno)); | |
6573faff PA |
1079 | close(sockfd); |
1080 | return 0; | |
1081 | } | |
a87e8be2 | 1082 | |
f35230fb | 1083 | if (listen(sockfd, 5) < 0) { |
089d82e8 NTND |
1084 | logerror("Could not listen to %s: %s", |
1085 | ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)), | |
1086 | strerror(errno)); | |
f35230fb PS |
1087 | close(sockfd); |
1088 | return 0; | |
1089 | } | |
1090 | ||
20276889 AJ |
1091 | flags = fcntl(sockfd, F_GETFD, 0); |
1092 | if (flags >= 0) | |
1093 | fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC); | |
1094 | ||
2caa3215 AS |
1095 | ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc); |
1096 | socklist->list[socklist->nr++] = sockfd; | |
f35230fb | 1097 | return 1; |
6573faff PA |
1098 | } |
1099 | ||
1100 | #endif | |
1101 | ||
3a3a29c1 | 1102 | static void socksetup(struct string_list *listen_addr, int listen_port, struct socketlist *socklist) |
2caa3215 | 1103 | { |
3a3a29c1 AS |
1104 | if (!listen_addr->nr) |
1105 | setup_named_sock(NULL, listen_port, socklist); | |
1106 | else { | |
1107 | int i, socknum; | |
1108 | for (i = 0; i < listen_addr->nr; i++) { | |
1109 | socknum = setup_named_sock(listen_addr->items[i].string, | |
1110 | listen_port, socklist); | |
1111 | ||
1112 | if (socknum == 0) | |
1113 | logerror("unable to allocate any listen sockets for host %s on port %u", | |
1114 | listen_addr->items[i].string, listen_port); | |
1115 | } | |
1116 | } | |
2caa3215 AS |
1117 | } |
1118 | ||
1119 | static int service_loop(struct socketlist *socklist) | |
6573faff PA |
1120 | { |
1121 | struct pollfd *pfd; | |
1122 | int i; | |
1123 | ||
ca56dadb | 1124 | CALLOC_ARRAY(pfd, socklist->nr); |
6573faff | 1125 | |
2caa3215 AS |
1126 | for (i = 0; i < socklist->nr; i++) { |
1127 | pfd[i].fd = socklist->list[i]; | |
6573faff PA |
1128 | pfd[i].events = POLLIN; |
1129 | } | |
9220282a PA |
1130 | |
1131 | signal(SIGCHLD, child_handler); | |
a87e8be2 LT |
1132 | |
1133 | for (;;) { | |
df076bdb | 1134 | int i; |
6573faff | 1135 | |
695605b5 SB |
1136 | check_dead_children(); |
1137 | ||
2caa3215 | 1138 | if (poll(pfd, socklist->nr, -1) < 0) { |
1eef0b33 | 1139 | if (errno != EINTR) { |
df0daf8a | 1140 | logerror("Poll failed, resuming: %s", |
1eef0b33 JH |
1141 | strerror(errno)); |
1142 | sleep(1); | |
1143 | } | |
df076bdb YH |
1144 | continue; |
1145 | } | |
1146 | ||
2caa3215 | 1147 | for (i = 0; i < socklist->nr; i++) { |
6573faff | 1148 | if (pfd[i].revents & POLLIN) { |
f9c87be6 EFL |
1149 | union { |
1150 | struct sockaddr sa; | |
1151 | struct sockaddr_in sai; | |
1152 | #ifndef NO_IPV6 | |
1153 | struct sockaddr_in6 sai6; | |
1154 | #endif | |
1155 | } ss; | |
c295cf06 | 1156 | socklen_t sslen = sizeof(ss); |
f9c87be6 | 1157 | int incoming = accept(pfd[i].fd, &ss.sa, &sslen); |
df076bdb YH |
1158 | if (incoming < 0) { |
1159 | switch (errno) { | |
1160 | case EAGAIN: | |
1161 | case EINTR: | |
1162 | case ECONNABORTED: | |
1163 | continue; | |
1164 | default: | |
d824cbba | 1165 | die_errno("accept returned"); |
df076bdb YH |
1166 | } |
1167 | } | |
f9c87be6 | 1168 | handle(incoming, &ss.sa, sslen); |
a87e8be2 LT |
1169 | } |
1170 | } | |
a87e8be2 LT |
1171 | } |
1172 | } | |
1173 | ||
a666b472 EFL |
1174 | #ifdef NO_POSIX_GOODIES |
1175 | ||
1176 | struct credentials; | |
1177 | ||
1178 | static void drop_privileges(struct credentials *cred) | |
1179 | { | |
1180 | /* nothing */ | |
1181 | } | |
1182 | ||
a666b472 EFL |
1183 | static struct credentials *prepare_credentials(const char *user_name, |
1184 | const char *group_name) | |
1185 | { | |
1186 | die("--user not supported on this platform"); | |
1187 | } | |
1188 | ||
1189 | #else | |
1190 | ||
1191 | struct credentials { | |
1192 | struct passwd *pass; | |
1193 | gid_t gid; | |
1194 | }; | |
1195 | ||
1196 | static void drop_privileges(struct credentials *cred) | |
1197 | { | |
1198 | if (cred && (initgroups(cred->pass->pw_name, cred->gid) || | |
1199 | setgid (cred->gid) || setuid(cred->pass->pw_uid))) | |
1200 | die("cannot drop privileges"); | |
1201 | } | |
1202 | ||
1203 | static struct credentials *prepare_credentials(const char *user_name, | |
1204 | const char *group_name) | |
1205 | { | |
1206 | static struct credentials c; | |
1207 | ||
1208 | c.pass = getpwnam(user_name); | |
1209 | if (!c.pass) | |
1210 | die("user not found - %s", user_name); | |
1211 | ||
1212 | if (!group_name) | |
1213 | c.gid = c.pass->pw_gid; | |
1214 | else { | |
1215 | struct group *group = getgrnam(group_name); | |
1216 | if (!group) | |
1217 | die("group not found - %s", group_name); | |
1218 | ||
1219 | c.gid = group->gr_gid; | |
1220 | } | |
1221 | ||
1222 | return &c; | |
1223 | } | |
a666b472 | 1224 | #endif |
a5262768 | 1225 | |
a666b472 EFL |
1226 | static int serve(struct string_list *listen_addr, int listen_port, |
1227 | struct credentials *cred) | |
6573faff | 1228 | { |
2caa3215 | 1229 | struct socketlist socklist = { NULL, 0, 0 }; |
4ae22d96 | 1230 | |
2caa3215 AS |
1231 | socksetup(listen_addr, listen_port, &socklist); |
1232 | if (socklist.nr == 0) | |
3a3a29c1 AS |
1233 | die("unable to allocate any listen sockets on port %u", |
1234 | listen_port); | |
4ae22d96 | 1235 | |
a666b472 | 1236 | drop_privileges(cred); |
678dac6b | 1237 | |
f6a34cfb CB |
1238 | loginfo("Ready to rumble"); |
1239 | ||
2caa3215 | 1240 | return service_loop(&socklist); |
4ae22d96 | 1241 | } |
6573faff | 1242 | |
3f2e2297 | 1243 | int cmd_main(int argc, const char **argv) |
a87e8be2 | 1244 | { |
dd467629 | 1245 | int listen_port = 0; |
badf2fe1 | 1246 | struct string_list listen_addr = STRING_LIST_INIT_DUP; |
30e15602 | 1247 | int serve_mode = 0, inetd_mode = 0; |
678dac6b | 1248 | const char *pid_file = NULL, *user_name = NULL, *group_name = NULL; |
a5262768 | 1249 | int detach = 0; |
a666b472 | 1250 | struct credentials *cred = NULL; |
a87e8be2 | 1251 | int i; |
badf2fe1 | 1252 | int ret; |
a87e8be2 LT |
1253 | |
1254 | for (i = 1; i < argc; i++) { | |
3f2e2297 | 1255 | const char *arg = argv[i]; |
ae021d87 | 1256 | const char *v; |
a87e8be2 | 1257 | |
ae021d87 | 1258 | if (skip_prefix(arg, "--listen=", &v)) { |
badf2fe1 | 1259 | string_list_append_nodup(&listen_addr, xstrdup_tolower(v)); |
6720e95b | 1260 | continue; |
dd467629 | 1261 | } |
ae021d87 | 1262 | if (skip_prefix(arg, "--port=", &v)) { |
a87e8be2 LT |
1263 | char *end; |
1264 | unsigned long n; | |
ae021d87 JK |
1265 | n = strtoul(v, &end, 0); |
1266 | if (*v && !*end) { | |
dd467629 | 1267 | listen_port = n; |
a87e8be2 LT |
1268 | continue; |
1269 | } | |
1270 | } | |
30e15602 EFL |
1271 | if (!strcmp(arg, "--serve")) { |
1272 | serve_mode = 1; | |
1273 | continue; | |
1274 | } | |
e64e1b79 LT |
1275 | if (!strcmp(arg, "--inetd")) { |
1276 | inetd_mode = 1; | |
1277 | continue; | |
1278 | } | |
f8ff0c06 PB |
1279 | if (!strcmp(arg, "--verbose")) { |
1280 | verbose = 1; | |
1281 | continue; | |
1282 | } | |
9048fe1c | 1283 | if (!strcmp(arg, "--syslog")) { |
0c591cac | 1284 | log_destination = LOG_DESTINATION_SYSLOG; |
9048fe1c PB |
1285 | continue; |
1286 | } | |
0c591cac LW |
1287 | if (skip_prefix(arg, "--log-destination=", &v)) { |
1288 | if (!strcmp(v, "syslog")) { | |
1289 | log_destination = LOG_DESTINATION_SYSLOG; | |
1290 | continue; | |
1291 | } else if (!strcmp(v, "stderr")) { | |
1292 | log_destination = LOG_DESTINATION_STDERR; | |
1293 | continue; | |
1294 | } else if (!strcmp(v, "none")) { | |
1295 | log_destination = LOG_DESTINATION_NONE; | |
1296 | continue; | |
1297 | } else | |
1298 | die("unknown log destination '%s'", v); | |
1299 | } | |
4ae95682 PA |
1300 | if (!strcmp(arg, "--export-all")) { |
1301 | export_all_trees = 1; | |
1302 | continue; | |
1303 | } | |
ae021d87 JK |
1304 | if (skip_prefix(arg, "--access-hook=", &v)) { |
1305 | access_hook = v; | |
93741e4a JH |
1306 | continue; |
1307 | } | |
ae021d87 JK |
1308 | if (skip_prefix(arg, "--timeout=", &v)) { |
1309 | timeout = atoi(v); | |
a8883288 | 1310 | continue; |
960deccb | 1311 | } |
ae021d87 JK |
1312 | if (skip_prefix(arg, "--init-timeout=", &v)) { |
1313 | init_timeout = atoi(v); | |
a8883288 | 1314 | continue; |
960deccb | 1315 | } |
ae021d87 JK |
1316 | if (skip_prefix(arg, "--max-connections=", &v)) { |
1317 | max_connections = atoi(v); | |
3bd62c21 SB |
1318 | if (max_connections < 0) |
1319 | max_connections = 0; /* unlimited */ | |
1320 | continue; | |
1321 | } | |
4dbd1352 AE |
1322 | if (!strcmp(arg, "--strict-paths")) { |
1323 | strict_paths = 1; | |
1324 | continue; | |
1325 | } | |
ae021d87 JK |
1326 | if (skip_prefix(arg, "--base-path=", &v)) { |
1327 | base_path = v; | |
b21c31c9 PB |
1328 | continue; |
1329 | } | |
73a7a656 JA |
1330 | if (!strcmp(arg, "--base-path-relaxed")) { |
1331 | base_path_relaxed = 1; | |
1332 | continue; | |
1333 | } | |
ae021d87 JK |
1334 | if (skip_prefix(arg, "--interpolated-path=", &v)) { |
1335 | interpolated_path = v; | |
49ba83fb JL |
1336 | continue; |
1337 | } | |
1955fabf MW |
1338 | if (!strcmp(arg, "--reuseaddr")) { |
1339 | reuseaddr = 1; | |
1340 | continue; | |
1341 | } | |
603968d2 JH |
1342 | if (!strcmp(arg, "--user-path")) { |
1343 | user_path = ""; | |
1344 | continue; | |
1345 | } | |
ae021d87 JK |
1346 | if (skip_prefix(arg, "--user-path=", &v)) { |
1347 | user_path = v; | |
603968d2 JH |
1348 | continue; |
1349 | } | |
ae021d87 JK |
1350 | if (skip_prefix(arg, "--pid-file=", &v)) { |
1351 | pid_file = v; | |
45ed5d7f ML |
1352 | continue; |
1353 | } | |
a5262768 ML |
1354 | if (!strcmp(arg, "--detach")) { |
1355 | detach = 1; | |
a5262768 ML |
1356 | continue; |
1357 | } | |
ae021d87 JK |
1358 | if (skip_prefix(arg, "--user=", &v)) { |
1359 | user_name = v; | |
678dac6b TS |
1360 | continue; |
1361 | } | |
ae021d87 JK |
1362 | if (skip_prefix(arg, "--group=", &v)) { |
1363 | group_name = v; | |
678dac6b TS |
1364 | continue; |
1365 | } | |
ae021d87 JK |
1366 | if (skip_prefix(arg, "--enable=", &v)) { |
1367 | enable_service(v, 1); | |
d819e4e6 JH |
1368 | continue; |
1369 | } | |
ae021d87 JK |
1370 | if (skip_prefix(arg, "--disable=", &v)) { |
1371 | enable_service(v, 0); | |
d819e4e6 JH |
1372 | continue; |
1373 | } | |
ae021d87 JK |
1374 | if (skip_prefix(arg, "--allow-override=", &v)) { |
1375 | make_service_overridable(v, 1); | |
d819e4e6 JH |
1376 | continue; |
1377 | } | |
ae021d87 JK |
1378 | if (skip_prefix(arg, "--forbid-override=", &v)) { |
1379 | make_service_overridable(v, 0); | |
d819e4e6 JH |
1380 | continue; |
1381 | } | |
82246b76 | 1382 | if (!strcmp(arg, "--informative-errors")) { |
d5570f4d JK |
1383 | informative_errors = 1; |
1384 | continue; | |
1385 | } | |
82246b76 | 1386 | if (!strcmp(arg, "--no-informative-errors")) { |
d5570f4d JK |
1387 | informative_errors = 0; |
1388 | continue; | |
1389 | } | |
4ae95682 PA |
1390 | if (!strcmp(arg, "--")) { |
1391 | ok_paths = &argv[i+1]; | |
1392 | break; | |
1393 | } else if (arg[0] != '-') { | |
1394 | ok_paths = &argv[i]; | |
1395 | break; | |
1396 | } | |
e64e1b79 | 1397 | |
a87e8be2 LT |
1398 | usage(daemon_usage); |
1399 | } | |
1400 | ||
0c591cac LW |
1401 | if (log_destination == LOG_DESTINATION_UNSET) { |
1402 | if (inetd_mode || detach) | |
1403 | log_destination = LOG_DESTINATION_SYSLOG; | |
1404 | else | |
1405 | log_destination = LOG_DESTINATION_STDERR; | |
1406 | } | |
1407 | ||
1408 | if (log_destination == LOG_DESTINATION_SYSLOG) { | |
6a992e9e | 1409 | openlog("git-daemon", LOG_PID, LOG_DAEMON); |
22665bba | 1410 | set_die_routine(daemon_die); |
460c2010 | 1411 | } else |
48196afd | 1412 | /* avoid splitting a message in the middle */ |
48cfaea1 | 1413 | setvbuf(stderr, NULL, _IOFBF, 4096); |
22665bba | 1414 | |
9cddf56e EFL |
1415 | if (inetd_mode && (detach || group_name || user_name)) |
1416 | die("--detach, --user and --group are incompatible with --inetd"); | |
678dac6b | 1417 | |
3a3a29c1 | 1418 | if (inetd_mode && (listen_port || (listen_addr.nr > 0))) |
dd467629 JL |
1419 | die("--listen= and --port= are incompatible with --inetd"); |
1420 | else if (listen_port == 0) | |
1421 | listen_port = DEFAULT_GIT_PORT; | |
1422 | ||
678dac6b TS |
1423 | if (group_name && !user_name) |
1424 | die("--group supplied without --user"); | |
1425 | ||
a666b472 EFL |
1426 | if (user_name) |
1427 | cred = prepare_credentials(user_name, group_name); | |
678dac6b | 1428 | |
ad8b4f56 | 1429 | if (strict_paths && (!ok_paths || !*ok_paths)) |
dee8a145 | 1430 | die("option --strict-paths requires '<directory>' arguments"); |
ad8b4f56 | 1431 | |
90b4a71c JH |
1432 | if (base_path && !is_directory(base_path)) |
1433 | die("base-path '%s' does not exist or is not a directory", | |
1434 | base_path); | |
20632071 | 1435 | |
e67d906d | 1436 | if (log_destination != LOG_DESTINATION_STDERR) { |
30e15602 EFL |
1437 | if (!freopen("/dev/null", "w", stderr)) |
1438 | die_errno("failed to redirect stderr to /dev/null"); | |
1439 | } | |
1440 | ||
badf2fe1 JK |
1441 | if (inetd_mode || serve_mode) { |
1442 | ret = execute(); | |
1443 | } else { | |
1444 | if (detach) { | |
1445 | if (daemonize()) | |
1446 | die("--detach not supported on this platform"); | |
1447 | } | |
bce8230d | 1448 | |
badf2fe1 JK |
1449 | if (pid_file) |
1450 | write_file(pid_file, "%"PRIuMAX, (uintmax_t) getpid()); | |
258e93a1 | 1451 | |
badf2fe1 JK |
1452 | /* prepare argv for serving-processes */ |
1453 | strvec_push(&cld_argv, argv[0]); /* git-daemon */ | |
1454 | strvec_push(&cld_argv, "--serve"); | |
1455 | for (i = 1; i < argc; ++i) | |
1456 | strvec_push(&cld_argv, argv[i]); | |
45ed5d7f | 1457 | |
badf2fe1 JK |
1458 | ret = serve(&listen_addr, listen_port, cred); |
1459 | } | |
30e15602 | 1460 | |
badf2fe1 JK |
1461 | string_list_clear(&listen_addr, 0); |
1462 | return ret; | |
a87e8be2 | 1463 | } |