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Commit | Line | Data |
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eaa94919 LT |
1 | #include <signal.h> |
2 | #include <sys/wait.h> | |
a87e8be2 | 3 | #include <sys/socket.h> |
3cd6ecda | 4 | #include <sys/time.h> |
6573faff | 5 | #include <sys/poll.h> |
df076bdb | 6 | #include <netdb.h> |
a87e8be2 | 7 | #include <netinet/in.h> |
f8ff0c06 | 8 | #include <arpa/inet.h> |
9048fe1c | 9 | #include <syslog.h> |
979e32fa RS |
10 | #include "pkt-line.h" |
11 | #include "cache.h" | |
77cb17e9 | 12 | #include "exec_cmd.h" |
f8ff0c06 | 13 | |
9048fe1c | 14 | static int log_syslog; |
f8ff0c06 | 15 | static int verbose; |
1955fabf | 16 | static int reuseaddr; |
f8ff0c06 | 17 | |
960deccb PA |
18 | static const char daemon_usage[] = |
19 | "git-daemon [--verbose] [--syslog] [--inetd | --port=n] [--export-all]\n" | |
b21c31c9 | 20 | " [--timeout=n] [--init-timeout=n] [--strict-paths]\n" |
603968d2 | 21 | " [--base-path=path] [--user-path | --user-path=path]\n" |
6c35119a | 22 | " [--reuseaddr] [--detach] [--pid-file=file] [directory...]"; |
4ae95682 PA |
23 | |
24 | /* List of acceptable pathname prefixes */ | |
25 | static char **ok_paths = NULL; | |
4dbd1352 | 26 | static int strict_paths = 0; |
4ae95682 PA |
27 | |
28 | /* If this is set, git-daemon-export-ok is not required */ | |
29 | static int export_all_trees = 0; | |
f8ff0c06 | 30 | |
b21c31c9 PB |
31 | /* Take all paths relative to this one if non-NULL */ |
32 | static char *base_path = NULL; | |
33 | ||
603968d2 JH |
34 | /* If defined, ~user notation is allowed and the string is inserted |
35 | * after ~user/. E.g. a request to git://host/~alice/frotz would | |
36 | * go to /home/alice/pub_git/frotz with --user-path=pub_git. | |
37 | */ | |
554fe20d | 38 | static const char *user_path = NULL; |
603968d2 | 39 | |
960deccb PA |
40 | /* Timeout, and initial timeout */ |
41 | static unsigned int timeout = 0; | |
42 | static unsigned int init_timeout = 0; | |
f8ff0c06 | 43 | |
9048fe1c | 44 | static void logreport(int priority, const char *err, va_list params) |
f8ff0c06 PB |
45 | { |
46 | /* We should do a single write so that it is atomic and output | |
47 | * of several processes do not get intermingled. */ | |
48 | char buf[1024]; | |
49 | int buflen; | |
50 | int maxlen, msglen; | |
51 | ||
52 | /* sizeof(buf) should be big enough for "[pid] \n" */ | |
1bedd4ca | 53 | buflen = snprintf(buf, sizeof(buf), "[%ld] ", (long) getpid()); |
f8ff0c06 PB |
54 | |
55 | maxlen = sizeof(buf) - buflen - 1; /* -1 for our own LF */ | |
56 | msglen = vsnprintf(buf + buflen, maxlen, err, params); | |
57 | ||
9048fe1c PB |
58 | if (log_syslog) { |
59 | syslog(priority, "%s", buf); | |
60 | return; | |
61 | } | |
62 | ||
f8ff0c06 PB |
63 | /* maxlen counted our own LF but also counts space given to |
64 | * vsnprintf for the terminating NUL. We want to make sure that | |
65 | * we have space for our own LF and NUL after the "meat" of the | |
66 | * message, so truncate it at maxlen - 1. | |
67 | */ | |
68 | if (msglen > maxlen - 1) | |
69 | msglen = maxlen - 1; | |
70 | else if (msglen < 0) | |
71 | msglen = 0; /* Protect against weird return values. */ | |
72 | buflen += msglen; | |
73 | ||
74 | buf[buflen++] = '\n'; | |
75 | buf[buflen] = '\0'; | |
76 | ||
77 | write(2, buf, buflen); | |
78 | } | |
79 | ||
cdda4745 | 80 | static void logerror(const char *err, ...) |
f8ff0c06 PB |
81 | { |
82 | va_list params; | |
83 | va_start(params, err); | |
9048fe1c | 84 | logreport(LOG_ERR, err, params); |
f8ff0c06 PB |
85 | va_end(params); |
86 | } | |
87 | ||
cdda4745 | 88 | static void loginfo(const char *err, ...) |
f8ff0c06 PB |
89 | { |
90 | va_list params; | |
91 | if (!verbose) | |
92 | return; | |
93 | va_start(params, err); | |
9048fe1c | 94 | logreport(LOG_INFO, err, params); |
f8ff0c06 PB |
95 | va_end(params); |
96 | } | |
a87e8be2 | 97 | |
ad8b4f56 ML |
98 | static void NORETURN daemon_die(const char *err, va_list params) |
99 | { | |
100 | logreport(LOG_ERR, err, params); | |
101 | exit(1); | |
102 | } | |
103 | ||
d79374c7 JH |
104 | static int avoid_alias(char *p) |
105 | { | |
106 | int sl, ndot; | |
107 | ||
108 | /* | |
109 | * This resurrects the belts and suspenders paranoia check by HPA | |
110 | * done in <435560F7.4080006@zytor.com> thread, now enter_repo() | |
111 | * does not do getcwd() based path canonicalizations. | |
112 | * | |
113 | * sl becomes true immediately after seeing '/' and continues to | |
114 | * be true as long as dots continue after that without intervening | |
115 | * non-dot character. | |
116 | */ | |
117 | if (!p || (*p != '/' && *p != '~')) | |
118 | return -1; | |
119 | sl = 1; ndot = 0; | |
120 | p++; | |
121 | ||
122 | while (1) { | |
123 | char ch = *p++; | |
124 | if (sl) { | |
125 | if (ch == '.') | |
126 | ndot++; | |
127 | else if (ch == '/') { | |
128 | if (ndot < 3) | |
129 | /* reject //, /./ and /../ */ | |
130 | return -1; | |
131 | ndot = 0; | |
132 | } | |
133 | else if (ch == 0) { | |
134 | if (0 < ndot && ndot < 3) | |
135 | /* reject /.$ and /..$ */ | |
136 | return -1; | |
137 | return 0; | |
138 | } | |
139 | else | |
140 | sl = ndot = 0; | |
141 | } | |
142 | else if (ch == 0) | |
143 | return 0; | |
144 | else if (ch == '/') { | |
145 | sl = 1; | |
146 | ndot = 0; | |
147 | } | |
148 | } | |
149 | } | |
150 | ||
4dbd1352 | 151 | static char *path_ok(char *dir) |
4ae95682 | 152 | { |
603968d2 | 153 | static char rpath[PATH_MAX]; |
d79374c7 JH |
154 | char *path; |
155 | ||
156 | if (avoid_alias(dir)) { | |
157 | logerror("'%s': aliased", dir); | |
158 | return NULL; | |
159 | } | |
160 | ||
603968d2 JH |
161 | if (*dir == '~') { |
162 | if (!user_path) { | |
163 | logerror("'%s': User-path not allowed", dir); | |
164 | return NULL; | |
165 | } | |
166 | if (*user_path) { | |
167 | /* Got either "~alice" or "~alice/foo"; | |
168 | * rewrite them to "~alice/%s" or | |
169 | * "~alice/%s/foo". | |
170 | */ | |
171 | int namlen, restlen = strlen(dir); | |
172 | char *slash = strchr(dir, '/'); | |
173 | if (!slash) | |
174 | slash = dir + restlen; | |
175 | namlen = slash - dir; | |
176 | restlen -= namlen; | |
177 | loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash); | |
178 | snprintf(rpath, PATH_MAX, "%.*s/%s%.*s", | |
179 | namlen, dir, user_path, restlen, slash); | |
180 | dir = rpath; | |
181 | } | |
182 | } | |
183 | else if (base_path) { | |
184 | if (*dir != '/') { | |
185 | /* Allow only absolute */ | |
1fda3d55 | 186 | logerror("'%s': Non-absolute path denied (base-path active)", dir); |
b21c31c9 PB |
187 | return NULL; |
188 | } | |
363f24c9 JH |
189 | else { |
190 | snprintf(rpath, PATH_MAX, "%s%s", base_path, dir); | |
191 | dir = rpath; | |
192 | } | |
b21c31c9 PB |
193 | } |
194 | ||
d79374c7 | 195 | path = enter_repo(dir, strict_paths); |
3e04c62d | 196 | |
4dbd1352 AE |
197 | if (!path) { |
198 | logerror("'%s': unable to chdir or not a git archive", dir); | |
199 | return NULL; | |
4ae95682 PA |
200 | } |
201 | ||
202 | if ( ok_paths && *ok_paths ) { | |
ce335fe0 | 203 | char **pp; |
4dbd1352 | 204 | int pathlen = strlen(path); |
4ae95682 | 205 | |
ce335fe0 | 206 | /* The validation is done on the paths after enter_repo |
d79374c7 JH |
207 | * appends optional {.git,.git/.git} and friends, but |
208 | * it does not use getcwd(). So if your /pub is | |
209 | * a symlink to /mnt/pub, you can whitelist /pub and | |
210 | * do not have to say /mnt/pub. | |
211 | * Do not say /pub/. | |
ce335fe0 | 212 | */ |
4ae95682 PA |
213 | for ( pp = ok_paths ; *pp ; pp++ ) { |
214 | int len = strlen(*pp); | |
ce335fe0 JH |
215 | if (len <= pathlen && |
216 | !memcmp(*pp, path, len) && | |
217 | (path[len] == '\0' || | |
218 | (!strict_paths && path[len] == '/'))) | |
219 | return path; | |
4ae95682 | 220 | } |
4dbd1352 AE |
221 | } |
222 | else { | |
223 | /* be backwards compatible */ | |
224 | if (!strict_paths) | |
225 | return path; | |
4ae95682 PA |
226 | } |
227 | ||
4dbd1352 AE |
228 | logerror("'%s': not in whitelist", path); |
229 | return NULL; /* Fallthrough. Deny by default */ | |
4ae95682 | 230 | } |
a87e8be2 | 231 | |
4dbd1352 | 232 | static int upload(char *dir) |
a87e8be2 | 233 | { |
4dbd1352 AE |
234 | /* Timeout as string */ |
235 | char timeout_buf[64]; | |
236 | const char *path; | |
237 | ||
238 | loginfo("Request for '%s'", dir); | |
4ae95682 | 239 | |
4dbd1352 | 240 | if (!(path = path_ok(dir))) |
a87e8be2 | 241 | return -1; |
47888f0f | 242 | |
a87e8be2 LT |
243 | /* |
244 | * Security on the cheap. | |
245 | * | |
a935c397 | 246 | * We want a readable HEAD, usable "objects" directory, and |
a87e8be2 LT |
247 | * a "git-daemon-export-ok" flag that says that the other side |
248 | * is ok with us doing this. | |
4dbd1352 AE |
249 | * |
250 | * path_ok() uses enter_repo() and does whitelist checking. | |
251 | * We only need to make sure the repository is exported. | |
a87e8be2 | 252 | */ |
4dbd1352 | 253 | |
3e04c62d | 254 | if (!export_all_trees && access("git-daemon-export-ok", F_OK)) { |
4dbd1352 | 255 | logerror("'%s': repository not exported.", path); |
3e04c62d PA |
256 | errno = EACCES; |
257 | return -1; | |
258 | } | |
259 | ||
02d57da4 LT |
260 | /* |
261 | * We'll ignore SIGTERM from now on, we have a | |
262 | * good client. | |
263 | */ | |
264 | signal(SIGTERM, SIG_IGN); | |
265 | ||
960deccb PA |
266 | snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout); |
267 | ||
a87e8be2 | 268 | /* git-upload-pack only ever reads stuff, so this is safe */ |
77cb17e9 | 269 | execl_git_cmd("upload-pack", "--strict", timeout_buf, ".", NULL); |
a87e8be2 LT |
270 | return -1; |
271 | } | |
272 | ||
5b276ee4 | 273 | static int execute(struct sockaddr *addr) |
a87e8be2 | 274 | { |
7d80694a | 275 | static char line[1000]; |
5ad312be | 276 | int pktlen, len; |
7d80694a | 277 | |
5b276ee4 DW |
278 | if (addr) { |
279 | char addrbuf[256] = ""; | |
280 | int port = -1; | |
281 | ||
282 | if (addr->sa_family == AF_INET) { | |
283 | struct sockaddr_in *sin_addr = (void *) addr; | |
284 | inet_ntop(addr->sa_family, &sin_addr->sin_addr, addrbuf, sizeof(addrbuf)); | |
285 | port = sin_addr->sin_port; | |
286 | #ifndef NO_IPV6 | |
287 | } else if (addr && addr->sa_family == AF_INET6) { | |
288 | struct sockaddr_in6 *sin6_addr = (void *) addr; | |
289 | ||
290 | char *buf = addrbuf; | |
291 | *buf++ = '['; *buf = '\0'; /* stpcpy() is cool */ | |
292 | inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(addrbuf) - 1); | |
293 | strcat(buf, "]"); | |
294 | ||
295 | port = sin6_addr->sin6_port; | |
296 | #endif | |
297 | } | |
298 | loginfo("Connection from %s:%d", addrbuf, port); | |
299 | } | |
300 | ||
960deccb | 301 | alarm(init_timeout ? init_timeout : timeout); |
5ad312be | 302 | pktlen = packet_read_line(0, line, sizeof(line)); |
960deccb | 303 | alarm(0); |
7d80694a | 304 | |
5ad312be JL |
305 | len = strlen(line); |
306 | if (pktlen != len) | |
307 | loginfo("Extended attributes (%d bytes) exist <%.*s>", | |
308 | (int) pktlen - len, | |
309 | (int) pktlen - len, line + len + 1); | |
7d80694a LT |
310 | if (len && line[len-1] == '\n') |
311 | line[--len] = 0; | |
312 | ||
4dbd1352 | 313 | if (!strncmp("git-upload-pack ", line, 16)) |
3e04c62d | 314 | return upload(line+16); |
a87e8be2 | 315 | |
f8ff0c06 | 316 | logerror("Protocol error: '%s'", line); |
a87e8be2 LT |
317 | return -1; |
318 | } | |
319 | ||
66e631de LT |
320 | |
321 | /* | |
322 | * We count spawned/reaped separately, just to avoid any | |
323 | * races when updating them from signals. The SIGCHLD handler | |
324 | * will only update children_reaped, and the fork logic will | |
325 | * only update children_spawned. | |
326 | * | |
327 | * MAX_CHILDREN should be a power-of-two to make the modulus | |
328 | * operation cheap. It should also be at least twice | |
329 | * the maximum number of connections we will ever allow. | |
330 | */ | |
331 | #define MAX_CHILDREN 128 | |
332 | ||
333 | static int max_connections = 25; | |
334 | ||
335 | /* These are updated by the signal handler */ | |
336 | static volatile unsigned int children_reaped = 0; | |
4d8fa916 | 337 | static pid_t dead_child[MAX_CHILDREN]; |
66e631de LT |
338 | |
339 | /* These are updated by the main loop */ | |
340 | static unsigned int children_spawned = 0; | |
341 | static unsigned int children_deleted = 0; | |
342 | ||
4d8fa916 | 343 | static struct child { |
66e631de | 344 | pid_t pid; |
7fa09084 | 345 | int addrlen; |
df076bdb | 346 | struct sockaddr_storage address; |
66e631de LT |
347 | } live_child[MAX_CHILDREN]; |
348 | ||
7fa09084 | 349 | static void add_child(int idx, pid_t pid, struct sockaddr *addr, int addrlen) |
66e631de LT |
350 | { |
351 | live_child[idx].pid = pid; | |
352 | live_child[idx].addrlen = addrlen; | |
df076bdb | 353 | memcpy(&live_child[idx].address, addr, addrlen); |
66e631de LT |
354 | } |
355 | ||
356 | /* | |
357 | * Walk from "deleted" to "spawned", and remove child "pid". | |
358 | * | |
359 | * We move everything up by one, since the new "deleted" will | |
360 | * be one higher. | |
361 | */ | |
362 | static void remove_child(pid_t pid, unsigned deleted, unsigned spawned) | |
363 | { | |
364 | struct child n; | |
365 | ||
366 | deleted %= MAX_CHILDREN; | |
367 | spawned %= MAX_CHILDREN; | |
368 | if (live_child[deleted].pid == pid) { | |
369 | live_child[deleted].pid = -1; | |
370 | return; | |
371 | } | |
372 | n = live_child[deleted]; | |
373 | for (;;) { | |
374 | struct child m; | |
375 | deleted = (deleted + 1) % MAX_CHILDREN; | |
376 | if (deleted == spawned) | |
377 | die("could not find dead child %d\n", pid); | |
378 | m = live_child[deleted]; | |
379 | live_child[deleted] = n; | |
380 | if (m.pid == pid) | |
381 | return; | |
382 | n = m; | |
383 | } | |
384 | } | |
385 | ||
386 | /* | |
387 | * This gets called if the number of connections grows | |
388 | * past "max_connections". | |
389 | * | |
390 | * We _should_ start off by searching for connections | |
391 | * from the same IP, and if there is some address wth | |
392 | * multiple connections, we should kill that first. | |
393 | * | |
394 | * As it is, we just "randomly" kill 25% of the connections, | |
395 | * and our pseudo-random generator sucks too. I have no | |
396 | * shame. | |
397 | * | |
398 | * Really, this is just a place-holder for a _real_ algorithm. | |
399 | */ | |
02d57da4 | 400 | static void kill_some_children(int signo, unsigned start, unsigned stop) |
66e631de LT |
401 | { |
402 | start %= MAX_CHILDREN; | |
403 | stop %= MAX_CHILDREN; | |
404 | while (start != stop) { | |
405 | if (!(start & 3)) | |
02d57da4 | 406 | kill(live_child[start].pid, signo); |
66e631de LT |
407 | start = (start + 1) % MAX_CHILDREN; |
408 | } | |
409 | } | |
410 | ||
02d57da4 | 411 | static void check_max_connections(void) |
a87e8be2 | 412 | { |
02d57da4 | 413 | for (;;) { |
eaa94919 | 414 | int active; |
66e631de | 415 | unsigned spawned, reaped, deleted; |
eaa94919 | 416 | |
66e631de | 417 | spawned = children_spawned; |
66e631de LT |
418 | reaped = children_reaped; |
419 | deleted = children_deleted; | |
420 | ||
421 | while (deleted < reaped) { | |
422 | pid_t pid = dead_child[deleted % MAX_CHILDREN]; | |
423 | remove_child(pid, deleted, spawned); | |
424 | deleted++; | |
425 | } | |
426 | children_deleted = deleted; | |
427 | ||
428 | active = spawned - deleted; | |
02d57da4 LT |
429 | if (active <= max_connections) |
430 | break; | |
66e631de | 431 | |
02d57da4 LT |
432 | /* Kill some unstarted connections with SIGTERM */ |
433 | kill_some_children(SIGTERM, deleted, spawned); | |
434 | if (active <= max_connections << 1) | |
435 | break; | |
436 | ||
437 | /* If the SIGTERM thing isn't helping use SIGKILL */ | |
438 | kill_some_children(SIGKILL, deleted, spawned); | |
439 | sleep(1); | |
440 | } | |
441 | } | |
442 | ||
7fa09084 | 443 | static void handle(int incoming, struct sockaddr *addr, int addrlen) |
02d57da4 LT |
444 | { |
445 | pid_t pid = fork(); | |
446 | ||
447 | if (pid) { | |
448 | unsigned idx; | |
449 | ||
450 | close(incoming); | |
451 | if (pid < 0) | |
452 | return; | |
453 | ||
454 | idx = children_spawned % MAX_CHILDREN; | |
455 | children_spawned++; | |
456 | add_child(idx, pid, addr, addrlen); | |
66e631de | 457 | |
02d57da4 | 458 | check_max_connections(); |
a87e8be2 LT |
459 | return; |
460 | } | |
461 | ||
462 | dup2(incoming, 0); | |
463 | dup2(incoming, 1); | |
464 | close(incoming); | |
f8ff0c06 | 465 | |
5b276ee4 | 466 | exit(execute(addr)); |
a87e8be2 LT |
467 | } |
468 | ||
eaa94919 LT |
469 | static void child_handler(int signo) |
470 | { | |
471 | for (;;) { | |
9048fe1c PB |
472 | int status; |
473 | pid_t pid = waitpid(-1, &status, WNOHANG); | |
66e631de LT |
474 | |
475 | if (pid > 0) { | |
476 | unsigned reaped = children_reaped; | |
477 | dead_child[reaped % MAX_CHILDREN] = pid; | |
478 | children_reaped = reaped + 1; | |
f8ff0c06 | 479 | /* XXX: Custom logging, since we don't wanna getpid() */ |
9048fe1c | 480 | if (verbose) { |
554fe20d | 481 | const char *dead = ""; |
9048fe1c PB |
482 | if (!WIFEXITED(status) || WEXITSTATUS(status) > 0) |
483 | dead = " (with error)"; | |
484 | if (log_syslog) | |
485 | syslog(LOG_INFO, "[%d] Disconnected%s", pid, dead); | |
486 | else | |
487 | fprintf(stderr, "[%d] Disconnected%s\n", pid, dead); | |
488 | } | |
eaa94919 LT |
489 | continue; |
490 | } | |
491 | break; | |
492 | } | |
493 | } | |
494 | ||
1955fabf MW |
495 | static int set_reuse_addr(int sockfd) |
496 | { | |
497 | int on = 1; | |
498 | ||
499 | if (!reuseaddr) | |
500 | return 0; | |
501 | return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, | |
502 | &on, sizeof(on)); | |
503 | } | |
504 | ||
6573faff PA |
505 | #ifndef NO_IPV6 |
506 | ||
507 | static int socksetup(int port, int **socklist_p) | |
a87e8be2 | 508 | { |
df076bdb YH |
509 | int socknum = 0, *socklist = NULL; |
510 | int maxfd = -1; | |
df076bdb | 511 | char pbuf[NI_MAXSERV]; |
a87e8be2 | 512 | |
6573faff PA |
513 | struct addrinfo hints, *ai0, *ai; |
514 | int gai; | |
df076bdb YH |
515 | |
516 | sprintf(pbuf, "%d", port); | |
517 | memset(&hints, 0, sizeof(hints)); | |
518 | hints.ai_family = AF_UNSPEC; | |
519 | hints.ai_socktype = SOCK_STREAM; | |
520 | hints.ai_protocol = IPPROTO_TCP; | |
521 | hints.ai_flags = AI_PASSIVE; | |
522 | ||
523 | gai = getaddrinfo(NULL, pbuf, &hints, &ai0); | |
524 | if (gai) | |
525 | die("getaddrinfo() failed: %s\n", gai_strerror(gai)); | |
526 | ||
df076bdb YH |
527 | for (ai = ai0; ai; ai = ai->ai_next) { |
528 | int sockfd; | |
529 | int *newlist; | |
530 | ||
531 | sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); | |
532 | if (sockfd < 0) | |
533 | continue; | |
534 | if (sockfd >= FD_SETSIZE) { | |
535 | error("too large socket descriptor."); | |
536 | close(sockfd); | |
537 | continue; | |
538 | } | |
539 | ||
540 | #ifdef IPV6_V6ONLY | |
541 | if (ai->ai_family == AF_INET6) { | |
542 | int on = 1; | |
543 | setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY, | |
544 | &on, sizeof(on)); | |
545 | /* Note: error is not fatal */ | |
546 | } | |
547 | #endif | |
548 | ||
1955fabf MW |
549 | if (set_reuse_addr(sockfd)) { |
550 | close(sockfd); | |
0032d548 | 551 | continue; |
1955fabf MW |
552 | } |
553 | ||
df076bdb YH |
554 | if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) { |
555 | close(sockfd); | |
556 | continue; /* not fatal */ | |
557 | } | |
558 | if (listen(sockfd, 5) < 0) { | |
559 | close(sockfd); | |
560 | continue; /* not fatal */ | |
561 | } | |
562 | ||
563 | newlist = realloc(socklist, sizeof(int) * (socknum + 1)); | |
564 | if (!newlist) | |
565 | die("memory allocation failed: %s", strerror(errno)); | |
566 | ||
567 | socklist = newlist; | |
568 | socklist[socknum++] = sockfd; | |
569 | ||
df076bdb YH |
570 | if (maxfd < sockfd) |
571 | maxfd = sockfd; | |
572 | } | |
573 | ||
574 | freeaddrinfo(ai0); | |
575 | ||
6573faff PA |
576 | *socklist_p = socklist; |
577 | return socknum; | |
578 | } | |
579 | ||
580 | #else /* NO_IPV6 */ | |
581 | ||
582 | static int socksetup(int port, int **socklist_p) | |
583 | { | |
584 | struct sockaddr_in sin; | |
585 | int sockfd; | |
586 | ||
587 | sockfd = socket(AF_INET, SOCK_STREAM, 0); | |
588 | if (sockfd < 0) | |
589 | return 0; | |
590 | ||
591 | memset(&sin, 0, sizeof sin); | |
592 | sin.sin_family = AF_INET; | |
593 | sin.sin_addr.s_addr = htonl(INADDR_ANY); | |
594 | sin.sin_port = htons(port); | |
595 | ||
1955fabf MW |
596 | if (set_reuse_addr(sockfd)) { |
597 | close(sockfd); | |
598 | return 0; | |
599 | } | |
600 | ||
6573faff PA |
601 | if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) { |
602 | close(sockfd); | |
603 | return 0; | |
604 | } | |
a87e8be2 | 605 | |
f35230fb PS |
606 | if (listen(sockfd, 5) < 0) { |
607 | close(sockfd); | |
608 | return 0; | |
609 | } | |
610 | ||
1b4713fb | 611 | *socklist_p = xmalloc(sizeof(int)); |
6573faff | 612 | **socklist_p = sockfd; |
f35230fb | 613 | return 1; |
6573faff PA |
614 | } |
615 | ||
616 | #endif | |
617 | ||
618 | static int service_loop(int socknum, int *socklist) | |
619 | { | |
620 | struct pollfd *pfd; | |
621 | int i; | |
622 | ||
1b4713fb | 623 | pfd = xcalloc(socknum, sizeof(struct pollfd)); |
6573faff PA |
624 | |
625 | for (i = 0; i < socknum; i++) { | |
626 | pfd[i].fd = socklist[i]; | |
627 | pfd[i].events = POLLIN; | |
628 | } | |
9220282a PA |
629 | |
630 | signal(SIGCHLD, child_handler); | |
a87e8be2 LT |
631 | |
632 | for (;;) { | |
df076bdb | 633 | int i; |
6573faff | 634 | |
7872e055 | 635 | if (poll(pfd, socknum, -1) < 0) { |
1eef0b33 | 636 | if (errno != EINTR) { |
6573faff | 637 | error("poll failed, resuming: %s", |
1eef0b33 JH |
638 | strerror(errno)); |
639 | sleep(1); | |
640 | } | |
df076bdb YH |
641 | continue; |
642 | } | |
643 | ||
644 | for (i = 0; i < socknum; i++) { | |
6573faff | 645 | if (pfd[i].revents & POLLIN) { |
df076bdb | 646 | struct sockaddr_storage ss; |
7626e49e | 647 | unsigned int sslen = sizeof(ss); |
6573faff | 648 | int incoming = accept(pfd[i].fd, (struct sockaddr *)&ss, &sslen); |
df076bdb YH |
649 | if (incoming < 0) { |
650 | switch (errno) { | |
651 | case EAGAIN: | |
652 | case EINTR: | |
653 | case ECONNABORTED: | |
654 | continue; | |
655 | default: | |
656 | die("accept returned %s", strerror(errno)); | |
657 | } | |
658 | } | |
659 | handle(incoming, (struct sockaddr *)&ss, sslen); | |
a87e8be2 LT |
660 | } |
661 | } | |
a87e8be2 LT |
662 | } |
663 | } | |
664 | ||
258e93a1 ML |
665 | /* if any standard file descriptor is missing open it to /dev/null */ |
666 | static void sanitize_stdfds(void) | |
667 | { | |
668 | int fd = open("/dev/null", O_RDWR, 0); | |
669 | while (fd != -1 && fd < 2) | |
670 | fd = dup(fd); | |
671 | if (fd == -1) | |
672 | die("open /dev/null or dup failed: %s", strerror(errno)); | |
673 | if (fd > 2) | |
674 | close(fd); | |
675 | } | |
676 | ||
a5262768 ML |
677 | static void daemonize(void) |
678 | { | |
679 | switch (fork()) { | |
680 | case 0: | |
681 | break; | |
682 | case -1: | |
683 | die("fork failed: %s", strerror(errno)); | |
684 | default: | |
685 | exit(0); | |
686 | } | |
687 | if (setsid() == -1) | |
688 | die("setsid failed: %s", strerror(errno)); | |
689 | close(0); | |
690 | close(1); | |
691 | close(2); | |
692 | sanitize_stdfds(); | |
693 | } | |
694 | ||
45ed5d7f ML |
695 | static void store_pid(const char *path) |
696 | { | |
697 | FILE *f = fopen(path, "w"); | |
698 | if (!f) | |
699 | die("cannot open pid file %s: %s", path, strerror(errno)); | |
700 | fprintf(f, "%d\n", getpid()); | |
701 | fclose(f); | |
702 | } | |
703 | ||
6573faff PA |
704 | static int serve(int port) |
705 | { | |
706 | int socknum, *socklist; | |
4ae22d96 | 707 | |
6573faff PA |
708 | socknum = socksetup(port, &socklist); |
709 | if (socknum == 0) | |
710 | die("unable to allocate any listen sockets on port %u", port); | |
4ae22d96 | 711 | |
6573faff | 712 | return service_loop(socknum, socklist); |
4ae22d96 | 713 | } |
6573faff | 714 | |
a87e8be2 LT |
715 | int main(int argc, char **argv) |
716 | { | |
717 | int port = DEFAULT_GIT_PORT; | |
e64e1b79 | 718 | int inetd_mode = 0; |
45ed5d7f | 719 | const char *pid_file = NULL; |
a5262768 | 720 | int detach = 0; |
a87e8be2 LT |
721 | int i; |
722 | ||
f0b7367c JH |
723 | /* Without this we cannot rely on waitpid() to tell |
724 | * what happened to our children. | |
725 | */ | |
726 | signal(SIGCHLD, SIG_DFL); | |
727 | ||
a87e8be2 LT |
728 | for (i = 1; i < argc; i++) { |
729 | char *arg = argv[i]; | |
730 | ||
731 | if (!strncmp(arg, "--port=", 7)) { | |
732 | char *end; | |
733 | unsigned long n; | |
734 | n = strtoul(arg+7, &end, 0); | |
735 | if (arg[7] && !*end) { | |
736 | port = n; | |
737 | continue; | |
738 | } | |
739 | } | |
e64e1b79 LT |
740 | if (!strcmp(arg, "--inetd")) { |
741 | inetd_mode = 1; | |
a8883288 | 742 | log_syslog = 1; |
e64e1b79 LT |
743 | continue; |
744 | } | |
f8ff0c06 PB |
745 | if (!strcmp(arg, "--verbose")) { |
746 | verbose = 1; | |
747 | continue; | |
748 | } | |
9048fe1c PB |
749 | if (!strcmp(arg, "--syslog")) { |
750 | log_syslog = 1; | |
9048fe1c PB |
751 | continue; |
752 | } | |
4ae95682 PA |
753 | if (!strcmp(arg, "--export-all")) { |
754 | export_all_trees = 1; | |
755 | continue; | |
756 | } | |
960deccb PA |
757 | if (!strncmp(arg, "--timeout=", 10)) { |
758 | timeout = atoi(arg+10); | |
a8883288 | 759 | continue; |
960deccb | 760 | } |
54e31a20 | 761 | if (!strncmp(arg, "--init-timeout=", 15)) { |
960deccb | 762 | init_timeout = atoi(arg+15); |
a8883288 | 763 | continue; |
960deccb | 764 | } |
4dbd1352 AE |
765 | if (!strcmp(arg, "--strict-paths")) { |
766 | strict_paths = 1; | |
767 | continue; | |
768 | } | |
b21c31c9 PB |
769 | if (!strncmp(arg, "--base-path=", 12)) { |
770 | base_path = arg+12; | |
771 | continue; | |
772 | } | |
1955fabf MW |
773 | if (!strcmp(arg, "--reuseaddr")) { |
774 | reuseaddr = 1; | |
775 | continue; | |
776 | } | |
603968d2 JH |
777 | if (!strcmp(arg, "--user-path")) { |
778 | user_path = ""; | |
779 | continue; | |
780 | } | |
781 | if (!strncmp(arg, "--user-path=", 12)) { | |
782 | user_path = arg + 12; | |
783 | continue; | |
784 | } | |
45ed5d7f ML |
785 | if (!strncmp(arg, "--pid-file=", 11)) { |
786 | pid_file = arg + 11; | |
787 | continue; | |
788 | } | |
a5262768 ML |
789 | if (!strcmp(arg, "--detach")) { |
790 | detach = 1; | |
791 | log_syslog = 1; | |
792 | continue; | |
793 | } | |
4ae95682 PA |
794 | if (!strcmp(arg, "--")) { |
795 | ok_paths = &argv[i+1]; | |
796 | break; | |
797 | } else if (arg[0] != '-') { | |
798 | ok_paths = &argv[i]; | |
799 | break; | |
800 | } | |
e64e1b79 | 801 | |
a87e8be2 LT |
802 | usage(daemon_usage); |
803 | } | |
804 | ||
ad8b4f56 | 805 | if (log_syslog) { |
a8883288 | 806 | openlog("git-daemon", 0, LOG_DAEMON); |
ad8b4f56 | 807 | set_die_routine(daemon_die); |
4dbd1352 AE |
808 | } |
809 | ||
ad8b4f56 ML |
810 | if (strict_paths && (!ok_paths || !*ok_paths)) |
811 | die("option --strict-paths requires a whitelist"); | |
812 | ||
7c3693f1 | 813 | if (inetd_mode) { |
5b276ee4 DW |
814 | struct sockaddr_storage ss; |
815 | struct sockaddr *peer = (struct sockaddr *)&ss; | |
816 | socklen_t slen = sizeof(ss); | |
817 | ||
ba0012c3 | 818 | freopen("/dev/null", "w", stderr); |
5b276ee4 DW |
819 | |
820 | if (getpeername(0, peer, &slen)) | |
821 | peer = NULL; | |
822 | ||
823 | return execute(peer); | |
7c3693f1 | 824 | } |
bce8230d | 825 | |
a5262768 ML |
826 | if (detach) |
827 | daemonize(); | |
828 | else | |
829 | sanitize_stdfds(); | |
258e93a1 | 830 | |
45ed5d7f ML |
831 | if (pid_file) |
832 | store_pid(pid_file); | |
833 | ||
bce8230d | 834 | return serve(port); |
a87e8be2 | 835 | } |