Merge branch 'jk/disable-commit-graph-during-upload-pack'
[git/git.git] / daemon.c
CommitLineData
979e32fa 1#include "cache.h"
b2141fc1 2#include "config.h"
85023577 3#include "pkt-line.h"
5d87dd4f
JS
4#include "run-command.h"
5#include "strbuf.h"
3a3a29c1 6#include "string-list.h"
f8ff0c06 7
2844923d
MD
8#ifdef NO_INITGROUPS
9#define initgroups(x, y) (0) /* nothing */
10#endif
11
0c591cac
LW
12static enum log_destination {
13 LOG_DESTINATION_UNSET = -1,
14 LOG_DESTINATION_NONE = 0,
15 LOG_DESTINATION_STDERR = 1,
16 LOG_DESTINATION_SYSLOG = 2,
17} log_destination = LOG_DESTINATION_UNSET;
f8ff0c06 18static int verbose;
1955fabf 19static int reuseaddr;
d5570f4d 20static int informative_errors;
f8ff0c06 21
960deccb 22static const char daemon_usage[] =
1b1dd23f 23"git daemon [--verbose] [--syslog] [--export-all]\n"
62b4698e
ŠN
24" [--timeout=<n>] [--init-timeout=<n>] [--max-connections=<n>]\n"
25" [--strict-paths] [--base-path=<path>] [--base-path-relaxed]\n"
26" [--user-path | --user-path=<path>]\n"
27" [--interpolated-path=<path>]\n"
9cddf56e 28" [--reuseaddr] [--pid-file=<file>]\n"
62b4698e 29" [--(enable|disable|allow-override|forbid-override)=<service>]\n"
93741e4a 30" [--access-hook=<path>]\n"
62b4698e 31" [--inetd | [--listen=<host_or_ipaddr>] [--port=<n>]\n"
9cddf56e 32" [--detach] [--user=<user> [--group=<group>]]\n"
0c591cac 33" [--log-destination=(stderr|syslog|none)]\n"
62b4698e 34" [<directory>...]";
4ae95682
PA
35
36/* List of acceptable pathname prefixes */
3f2e2297 37static const char **ok_paths;
96f1e58f 38static int strict_paths;
4ae95682
PA
39
40/* If this is set, git-daemon-export-ok is not required */
96f1e58f 41static int export_all_trees;
f8ff0c06 42
b21c31c9 43/* Take all paths relative to this one if non-NULL */
1055a890
JK
44static const char *base_path;
45static const char *interpolated_path;
73a7a656 46static int base_path_relaxed;
49ba83fb 47
603968d2
JH
48/* If defined, ~user notation is allowed and the string is inserted
49 * after ~user/. E.g. a request to git://host/~alice/frotz would
50 * go to /home/alice/pub_git/frotz with --user-path=pub_git.
51 */
96f1e58f 52static const char *user_path;
603968d2 53
960deccb 54/* Timeout, and initial timeout */
96f1e58f
DR
55static unsigned int timeout;
56static unsigned int init_timeout;
f8ff0c06 57
01cec54e
RS
58struct hostinfo {
59 struct strbuf hostname;
60 struct strbuf canon_hostname;
61 struct strbuf ip_address;
62 struct strbuf tcp_port;
63 unsigned int hostname_lookup_done:1;
64 unsigned int saw_extended_args:1;
65};
edef953e 66
01cec54e 67static void lookup_hostname(struct hostinfo *hi);
edef953e 68
01cec54e 69static const char *get_canon_hostname(struct hostinfo *hi)
edef953e 70{
01cec54e
RS
71 lookup_hostname(hi);
72 return hi->canon_hostname.buf;
edef953e
RS
73}
74
01cec54e 75static const char *get_ip_address(struct hostinfo *hi)
edef953e 76{
01cec54e
RS
77 lookup_hostname(hi);
78 return hi->ip_address.buf;
edef953e
RS
79}
80
9048fe1c 81static void logreport(int priority, const char *err, va_list params)
f8ff0c06 82{
0c591cac
LW
83 switch (log_destination) {
84 case LOG_DESTINATION_SYSLOG: {
6a992e9e
SB
85 char buf[1024];
86 vsnprintf(buf, sizeof(buf), err, params);
9048fe1c 87 syslog(priority, "%s", buf);
0c591cac
LW
88 break;
89 }
90 case LOG_DESTINATION_STDERR:
460c2010 91 /*
48cfaea1 92 * Since stderr is set to buffered mode, the
6a992e9e 93 * logging of different processes will not overlap
48cfaea1 94 * unless they overflow the (rather big) buffers.
6a992e9e 95 */
85e72830 96 fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid());
6a992e9e
SB
97 vfprintf(stderr, err, params);
98 fputc('\n', stderr);
48cfaea1 99 fflush(stderr);
0c591cac
LW
100 break;
101 case LOG_DESTINATION_NONE:
102 break;
103 case LOG_DESTINATION_UNSET:
104 BUG("log destination not initialized correctly");
6a992e9e 105 }
f8ff0c06
PB
106}
107
28bea9e5 108__attribute__((format (printf, 1, 2)))
cdda4745 109static void logerror(const char *err, ...)
f8ff0c06
PB
110{
111 va_list params;
112 va_start(params, err);
9048fe1c 113 logreport(LOG_ERR, err, params);
f8ff0c06
PB
114 va_end(params);
115}
116
28bea9e5 117__attribute__((format (printf, 1, 2)))
cdda4745 118static void loginfo(const char *err, ...)
f8ff0c06
PB
119{
120 va_list params;
121 if (!verbose)
122 return;
123 va_start(params, err);
9048fe1c 124 logreport(LOG_INFO, err, params);
f8ff0c06
PB
125 va_end(params);
126}
a87e8be2 127
ad8b4f56
ML
128static void NORETURN daemon_die(const char *err, va_list params)
129{
130 logreport(LOG_ERR, err, params);
131 exit(1);
132}
133
dc8edc8f
RS
134struct expand_path_context {
135 const char *directory;
01cec54e 136 struct hostinfo *hostinfo;
dc8edc8f
RS
137};
138
139static size_t expand_path(struct strbuf *sb, const char *placeholder, void *ctx)
140{
141 struct expand_path_context *context = ctx;
01cec54e 142 struct hostinfo *hi = context->hostinfo;
dc8edc8f
RS
143
144 switch (placeholder[0]) {
145 case 'H':
01cec54e 146 strbuf_addbuf(sb, &hi->hostname);
dc8edc8f
RS
147 return 1;
148 case 'C':
149 if (placeholder[1] == 'H') {
01cec54e 150 strbuf_addstr(sb, get_canon_hostname(hi));
dc8edc8f
RS
151 return 2;
152 }
153 break;
154 case 'I':
155 if (placeholder[1] == 'P') {
01cec54e 156 strbuf_addstr(sb, get_ip_address(hi));
dc8edc8f
RS
157 return 2;
158 }
159 break;
160 case 'P':
01cec54e 161 strbuf_addbuf(sb, &hi->tcp_port);
dc8edc8f
RS
162 return 1;
163 case 'D':
164 strbuf_addstr(sb, context->directory);
165 return 1;
166 }
167 return 0;
168}
169
01cec54e 170static const char *path_ok(const char *directory, struct hostinfo *hi)
4ae95682 171{
603968d2 172 static char rpath[PATH_MAX];
49ba83fb 173 static char interp_path[PATH_MAX];
6bdb0083 174 size_t rlen;
1c64b48e 175 const char *path;
1055a890 176 const char *dir;
49ba83fb 177
9d7ca667 178 dir = directory;
d79374c7 179
34b6cb8b 180 if (daemon_avoid_alias(dir)) {
d79374c7
JH
181 logerror("'%s': aliased", dir);
182 return NULL;
183 }
184
603968d2
JH
185 if (*dir == '~') {
186 if (!user_path) {
187 logerror("'%s': User-path not allowed", dir);
188 return NULL;
189 }
190 if (*user_path) {
191 /* Got either "~alice" or "~alice/foo";
192 * rewrite them to "~alice/%s" or
193 * "~alice/%s/foo".
194 */
195 int namlen, restlen = strlen(dir);
1055a890 196 const char *slash = strchr(dir, '/');
603968d2
JH
197 if (!slash)
198 slash = dir + restlen;
199 namlen = slash - dir;
200 restlen -= namlen;
201 loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
6bdb0083
JK
202 rlen = snprintf(rpath, sizeof(rpath), "%.*s/%s%.*s",
203 namlen, dir, user_path, restlen, slash);
204 if (rlen >= sizeof(rpath)) {
205 logerror("user-path too large: %s", rpath);
206 return NULL;
207 }
603968d2
JH
208 dir = rpath;
209 }
210 }
01cec54e 211 else if (interpolated_path && hi->saw_extended_args) {
9d7ca667 212 struct strbuf expanded_path = STRBUF_INIT;
dc8edc8f
RS
213 struct expand_path_context context;
214
215 context.directory = directory;
01cec54e 216 context.hostinfo = hi;
dc8edc8f 217
49ba83fb
JL
218 if (*dir != '/') {
219 /* Allow only absolute */
220 logerror("'%s': Non-absolute path denied (interpolated-path active)", dir);
221 return NULL;
222 }
223
9d7ca667 224 strbuf_expand(&expanded_path, interpolated_path,
dc8edc8f 225 expand_path, &context);
6bdb0083
JK
226
227 rlen = strlcpy(interp_path, expanded_path.buf,
228 sizeof(interp_path));
229 if (rlen >= sizeof(interp_path)) {
230 logerror("interpolated path too large: %s",
231 interp_path);
232 return NULL;
233 }
234
9d7ca667 235 strbuf_release(&expanded_path);
49ba83fb
JL
236 loginfo("Interpolated dir '%s'", interp_path);
237
238 dir = interp_path;
239 }
603968d2
JH
240 else if (base_path) {
241 if (*dir != '/') {
242 /* Allow only absolute */
1fda3d55 243 logerror("'%s': Non-absolute path denied (base-path active)", dir);
b21c31c9
PB
244 return NULL;
245 }
6bdb0083
JK
246 rlen = snprintf(rpath, sizeof(rpath), "%s%s", base_path, dir);
247 if (rlen >= sizeof(rpath)) {
248 logerror("base-path too large: %s", rpath);
249 return NULL;
250 }
49ba83fb 251 dir = rpath;
b21c31c9
PB
252 }
253
a583971f
RS
254 path = enter_repo(dir, strict_paths);
255 if (!path && base_path && base_path_relaxed) {
73a7a656
JA
256 /*
257 * if we fail and base_path_relaxed is enabled, try without
258 * prefixing the base path
259 */
a583971f
RS
260 dir = directory;
261 path = enter_repo(dir, strict_paths);
262 }
3e04c62d 263
4dbd1352 264 if (!path) {
05ac6b34 265 logerror("'%s' does not appear to be a git repository", dir);
4dbd1352 266 return NULL;
4ae95682
PA
267 }
268
269 if ( ok_paths && *ok_paths ) {
3f2e2297 270 const char **pp;
4dbd1352 271 int pathlen = strlen(path);
4ae95682 272
ce335fe0 273 /* The validation is done on the paths after enter_repo
a6080a0a 274 * appends optional {.git,.git/.git} and friends, but
d79374c7
JH
275 * it does not use getcwd(). So if your /pub is
276 * a symlink to /mnt/pub, you can whitelist /pub and
277 * do not have to say /mnt/pub.
278 * Do not say /pub/.
ce335fe0 279 */
4ae95682
PA
280 for ( pp = ok_paths ; *pp ; pp++ ) {
281 int len = strlen(*pp);
ce335fe0
JH
282 if (len <= pathlen &&
283 !memcmp(*pp, path, len) &&
284 (path[len] == '\0' ||
285 (!strict_paths && path[len] == '/')))
286 return path;
4ae95682 287 }
4dbd1352
AE
288 }
289 else {
290 /* be backwards compatible */
291 if (!strict_paths)
292 return path;
4ae95682
PA
293 }
294
4dbd1352
AE
295 logerror("'%s': not in whitelist", path);
296 return NULL; /* Fallthrough. Deny by default */
4ae95682 297}
a87e8be2 298
dfe422d0 299typedef int (*daemon_service_fn)(const struct argv_array *env);
d819e4e6
JH
300struct daemon_service {
301 const char *name;
302 const char *config_name;
303 daemon_service_fn fn;
304 int enabled;
305 int overridable;
306};
307
d5570f4d
JK
308static int daemon_error(const char *dir, const char *msg)
309{
310 if (!informative_errors)
311 msg = "access denied or repository not exported";
81c634e9 312 packet_write_fmt(1, "ERR %s: %s", msg, dir);
d5570f4d
JK
313 return -1;
314}
315
1055a890 316static const char *access_hook;
93741e4a 317
01cec54e
RS
318static int run_access_hook(struct daemon_service *service, const char *dir,
319 const char *path, struct hostinfo *hi)
93741e4a 320{
d3180279 321 struct child_process child = CHILD_PROCESS_INIT;
93741e4a
JH
322 struct strbuf buf = STRBUF_INIT;
323 const char *argv[8];
324 const char **arg = argv;
325 char *eol;
326 int seen_errors = 0;
327
93741e4a
JH
328 *arg++ = access_hook;
329 *arg++ = service->name;
330 *arg++ = path;
01cec54e
RS
331 *arg++ = hi->hostname.buf;
332 *arg++ = get_canon_hostname(hi);
333 *arg++ = get_ip_address(hi);
334 *arg++ = hi->tcp_port.buf;
93741e4a 335 *arg = NULL;
93741e4a 336
93741e4a
JH
337 child.use_shell = 1;
338 child.argv = argv;
339 child.no_stdin = 1;
340 child.no_stderr = 1;
341 child.out = -1;
342 if (start_command(&child)) {
343 logerror("daemon access hook '%s' failed to start",
344 access_hook);
345 goto error_return;
346 }
347 if (strbuf_read(&buf, child.out, 0) < 0) {
348 logerror("failed to read from pipe to daemon access hook '%s'",
349 access_hook);
350 strbuf_reset(&buf);
351 seen_errors = 1;
352 }
353 if (close(child.out) < 0) {
354 logerror("failed to close pipe to daemon access hook '%s'",
355 access_hook);
356 seen_errors = 1;
357 }
358 if (finish_command(&child))
359 seen_errors = 1;
360
361 if (!seen_errors) {
362 strbuf_release(&buf);
363 return 0;
364 }
365
366error_return:
367 strbuf_ltrim(&buf);
368 if (!buf.len)
369 strbuf_addstr(&buf, "service rejected");
370 eol = strchr(buf.buf, '\n');
371 if (eol)
372 *eol = '\0';
373 errno = EACCES;
374 daemon_error(dir, buf.buf);
375 strbuf_release(&buf);
376 return -1;
377}
378
01cec54e 379static int run_service(const char *dir, struct daemon_service *service,
dfe422d0 380 struct hostinfo *hi, const struct argv_array *env)
a87e8be2 381{
4dbd1352 382 const char *path;
d819e4e6 383 int enabled = service->enabled;
8939d32d 384 struct strbuf var = STRBUF_INIT;
d819e4e6 385
a47551c3 386 loginfo("Request %s for '%s'", service->name, dir);
4dbd1352 387
d819e4e6
JH
388 if (!enabled && !service->overridable) {
389 logerror("'%s': service not enabled.", service->name);
390 errno = EACCES;
d5570f4d 391 return daemon_error(dir, "service not enabled");
d819e4e6 392 }
4ae95682 393
01cec54e 394 if (!(path = path_ok(dir, hi)))
d5570f4d 395 return daemon_error(dir, "no such repository");
47888f0f 396
a87e8be2
LT
397 /*
398 * Security on the cheap.
399 *
a935c397 400 * We want a readable HEAD, usable "objects" directory, and
a87e8be2
LT
401 * a "git-daemon-export-ok" flag that says that the other side
402 * is ok with us doing this.
4dbd1352
AE
403 *
404 * path_ok() uses enter_repo() and does whitelist checking.
405 * We only need to make sure the repository is exported.
a87e8be2 406 */
4dbd1352 407
3e04c62d 408 if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
4dbd1352 409 logerror("'%s': repository not exported.", path);
3e04c62d 410 errno = EACCES;
d5570f4d 411 return daemon_error(dir, "repository not exported");
3e04c62d
PA
412 }
413
d819e4e6 414 if (service->overridable) {
8939d32d
TA
415 strbuf_addf(&var, "daemon.%s", service->config_name);
416 git_config_get_bool(var.buf, &enabled);
417 strbuf_release(&var);
d819e4e6
JH
418 }
419 if (!enabled) {
420 logerror("'%s': service not enabled for '%s'",
421 service->name, path);
422 errno = EACCES;
d5570f4d 423 return daemon_error(dir, "service not enabled");
d819e4e6
JH
424 }
425
93741e4a
JH
426 /*
427 * Optionally, a hook can choose to deny access to the
428 * repository depending on the phase of the moon.
429 */
01cec54e 430 if (access_hook && run_access_hook(service, dir, path, hi))
93741e4a
JH
431 return -1;
432
02d57da4
LT
433 /*
434 * We'll ignore SIGTERM from now on, we have a
435 * good client.
436 */
437 signal(SIGTERM, SIG_IGN);
438
dfe422d0 439 return service->fn(env);
d819e4e6
JH
440}
441
5d87dd4f
JS
442static void copy_to_log(int fd)
443{
444 struct strbuf line = STRBUF_INIT;
445 FILE *fp;
446
447 fp = fdopen(fd, "r");
448 if (fp == NULL) {
449 logerror("fdopen of error channel failed");
450 close(fd);
451 return;
452 }
453
8f309aeb 454 while (strbuf_getline_lf(&line, fp) != EOF) {
5d87dd4f
JS
455 logerror("%s", line.buf);
456 strbuf_setlen(&line, 0);
457 }
458
459 strbuf_release(&line);
460 fclose(fp);
461}
462
6a97da39 463static int run_service_command(struct child_process *cld)
5d87dd4f 464{
6a97da39
JK
465 argv_array_push(&cld->args, ".");
466 cld->git_cmd = 1;
467 cld->err = -1;
468 if (start_command(cld))
5d87dd4f
JS
469 return -1;
470
471 close(0);
472 close(1);
473
6a97da39 474 copy_to_log(cld->err);
5d87dd4f 475
6a97da39 476 return finish_command(cld);
5d87dd4f
JS
477}
478
dfe422d0 479static int upload_pack(const struct argv_array *env)
d819e4e6 480{
6a97da39
JK
481 struct child_process cld = CHILD_PROCESS_INIT;
482 argv_array_pushl(&cld.args, "upload-pack", "--strict", NULL);
483 argv_array_pushf(&cld.args, "--timeout=%u", timeout);
dfe422d0
BW
484
485 argv_array_pushv(&cld.env_array, env->argv);
486
6a97da39 487 return run_service_command(&cld);
a87e8be2
LT
488}
489
dfe422d0 490static int upload_archive(const struct argv_array *env)
39345a21 491{
6a97da39
JK
492 struct child_process cld = CHILD_PROCESS_INIT;
493 argv_array_push(&cld.args, "upload-archive");
dfe422d0
BW
494
495 argv_array_pushv(&cld.env_array, env->argv);
496
6a97da39 497 return run_service_command(&cld);
39345a21
FBH
498}
499
dfe422d0 500static int receive_pack(const struct argv_array *env)
4b3b1e1e 501{
6a97da39
JK
502 struct child_process cld = CHILD_PROCESS_INIT;
503 argv_array_push(&cld.args, "receive-pack");
dfe422d0
BW
504
505 argv_array_pushv(&cld.env_array, env->argv);
506
6a97da39 507 return run_service_command(&cld);
4b3b1e1e
LT
508}
509
d819e4e6 510static struct daemon_service daemon_service[] = {
39345a21 511 { "upload-archive", "uploadarch", upload_archive, 0, 1 },
d819e4e6 512 { "upload-pack", "uploadpack", upload_pack, 1, 1 },
4b3b1e1e 513 { "receive-pack", "receivepack", receive_pack, 0, 1 },
d819e4e6
JH
514};
515
f3fa1838
JH
516static void enable_service(const char *name, int ena)
517{
d819e4e6
JH
518 int i;
519 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
520 if (!strcmp(daemon_service[i].name, name)) {
521 daemon_service[i].enabled = ena;
522 return;
523 }
524 }
525 die("No such service %s", name);
526}
527
f3fa1838
JH
528static void make_service_overridable(const char *name, int ena)
529{
d819e4e6
JH
530 int i;
531 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
532 if (!strcmp(daemon_service[i].name, name)) {
533 daemon_service[i].overridable = ena;
534 return;
535 }
536 }
537 die("No such service %s", name);
538}
539
e8dbd76d
IL
540static void parse_host_and_port(char *hostport, char **host,
541 char **port)
542{
543 if (*hostport == '[') {
544 char *end;
545
546 end = strchr(hostport, ']');
547 if (!end)
9517e6b8 548 die("Invalid request ('[' without ']')");
e8dbd76d
IL
549 *end = '\0';
550 *host = hostport + 1;
551 if (!end[1])
552 *port = NULL;
553 else if (end[1] == ':')
554 *port = end + 2;
555 else
556 die("Garbage after end of host part");
557 } else {
558 *host = hostport;
559 *port = strrchr(hostport, ':');
560 if (*port) {
e9bd3235 561 **port = '\0';
e8dbd76d
IL
562 ++*port;
563 }
564 }
565}
566
b4853730
JK
567/*
568 * Sanitize a string from the client so that it's OK to be inserted into a
569 * filesystem path. Specifically, we disallow slashes, runs of "..", and
570 * trailing and leading dots, which means that the client cannot escape
571 * our base path via ".." traversal.
572 */
7a646cec 573static void sanitize_client(struct strbuf *out, const char *in)
b4853730
JK
574{
575 for (; *in; in++) {
576 if (*in == '/')
577 continue;
578 if (*in == '.' && (!out->len || out->buf[out->len - 1] == '.'))
579 continue;
580 strbuf_addch(out, *in);
581 }
582
583 while (out->len && out->buf[out->len - 1] == '.')
584 strbuf_setlen(out, out->len - 1);
585}
586
b4853730
JK
587/*
588 * Like sanitize_client, but we also perform any canonicalization
589 * to make life easier on the admin.
590 */
7a646cec 591static void canonicalize_client(struct strbuf *out, const char *in)
b4853730 592{
7a646cec
RS
593 sanitize_client(out, in);
594 strbuf_tolower(out);
b4853730
JK
595}
596
eb30aed7 597/*
73bb33a9 598 * Read the host as supplied by the client connection.
dfe422d0
BW
599 *
600 * Returns a pointer to the character after the NUL byte terminating the host
601 * arguemnt, or 'extra_args' if there is no host arguemnt.
eb30aed7 602 */
dfe422d0 603static char *parse_host_arg(struct hostinfo *hi, char *extra_args, int buflen)
49ba83fb
JL
604{
605 char *val;
606 int vallen;
607 char *end = extra_args + buflen;
608
73bb33a9 609 if (extra_args < end && *extra_args) {
01cec54e 610 hi->saw_extended_args = 1;
49ba83fb
JL
611 if (strncasecmp("host=", extra_args, 5) == 0) {
612 val = extra_args + 5;
613 vallen = strlen(val) + 1;
550fbcad 614 loginfo("Extended attribute \"host\": %s", val);
49ba83fb 615 if (*val) {
eb30aed7 616 /* Split <host>:<port> at colon. */
e8dbd76d
IL
617 char *host;
618 char *port;
619 parse_host_and_port(val, &host, &port);
01cec54e
RS
620 if (port)
621 sanitize_client(&hi->tcp_port, port);
622 canonicalize_client(&hi->hostname, host);
623 hi->hostname_lookup_done = 0;
49ba83fb 624 }
eb30aed7 625
49ba83fb
JL
626 /* On to the next one */
627 extra_args = val + vallen;
628 }
73bb33a9
SP
629 if (extra_args < end && *extra_args)
630 die("Invalid request");
49ba83fb 631 }
dfe422d0
BW
632
633 return extra_args;
634}
635
636static void parse_extra_args(struct hostinfo *hi, struct argv_array *env,
637 char *extra_args, int buflen)
638{
639 const char *end = extra_args + buflen;
640 struct strbuf git_protocol = STRBUF_INIT;
641
642 /* First look for the host argument */
643 extra_args = parse_host_arg(hi, extra_args, buflen);
644
645 /* Look for additional arguments places after a second NUL byte */
646 for (; extra_args < end; extra_args += strlen(extra_args) + 1) {
647 const char *arg = extra_args;
648
649 /*
650 * Parse the extra arguments, adding most to 'git_protocol'
651 * which will be used to set the 'GIT_PROTOCOL' envvar in the
652 * service that will be run.
653 *
654 * If there ends up being a particular arg in the future that
655 * git-daemon needs to parse specificly (like the 'host' arg)
656 * then it can be parsed here and not added to 'git_protocol'.
657 */
658 if (*arg) {
659 if (git_protocol.len > 0)
660 strbuf_addch(&git_protocol, ':');
661 strbuf_addstr(&git_protocol, arg);
662 }
663 }
664
550fbcad
JK
665 if (git_protocol.len > 0) {
666 loginfo("Extended attribute \"protocol\": %s", git_protocol.buf);
dfe422d0
BW
667 argv_array_pushf(env, GIT_PROTOCOL_ENVIRONMENT "=%s",
668 git_protocol.buf);
550fbcad 669 }
dfe422d0 670 strbuf_release(&git_protocol);
edef953e 671}
dd467629 672
edef953e
RS
673/*
674 * Locate canonical hostname and its IP address.
675 */
01cec54e 676static void lookup_hostname(struct hostinfo *hi)
edef953e 677{
01cec54e 678 if (!hi->hostname_lookup_done && hi->hostname.len) {
dd467629 679#ifndef NO_IPV6
dd467629 680 struct addrinfo hints;
3e8a00ae 681 struct addrinfo *ai;
dd467629
JL
682 int gai;
683 static char addrbuf[HOST_NAME_MAX + 1];
684
685 memset(&hints, 0, sizeof(hints));
686 hints.ai_flags = AI_CANONNAME;
687
01cec54e 688 gai = getaddrinfo(hi->hostname.buf, NULL, &hints, &ai);
dd467629 689 if (!gai) {
3e8a00ae
BK
690 struct sockaddr_in *sin_addr = (void *)ai->ai_addr;
691
692 inet_ntop(AF_INET, &sin_addr->sin_addr,
693 addrbuf, sizeof(addrbuf));
01cec54e 694 strbuf_addstr(&hi->ip_address, addrbuf);
3e8a00ae 695
7a646cec 696 if (ai->ai_canonname)
01cec54e 697 sanitize_client(&hi->canon_hostname,
7a646cec
RS
698 ai->ai_canonname);
699 else
01cec54e
RS
700 strbuf_addbuf(&hi->canon_hostname,
701 &hi->ip_address);
3e8a00ae
BK
702
703 freeaddrinfo(ai);
dd467629 704 }
dd467629 705#else
dd467629
JL
706 struct hostent *hent;
707 struct sockaddr_in sa;
708 char **ap;
709 static char addrbuf[HOST_NAME_MAX + 1];
710
d358f771 711 hent = gethostbyname(hi->hostname.buf);
eb6c4035
RS
712 if (hent) {
713 ap = hent->h_addr_list;
714 memset(&sa, 0, sizeof sa);
715 sa.sin_family = hent->h_addrtype;
716 sa.sin_port = htons(0);
717 memcpy(&sa.sin_addr, *ap, hent->h_length);
718
719 inet_ntop(hent->h_addrtype, &sa.sin_addr,
720 addrbuf, sizeof(addrbuf));
dd467629 721
01cec54e
RS
722 sanitize_client(&hi->canon_hostname, hent->h_name);
723 strbuf_addstr(&hi->ip_address, addrbuf);
eb6c4035 724 }
dd467629 725#endif
01cec54e 726 hi->hostname_lookup_done = 1;
6720e95b 727 }
dd467629
JL
728}
729
01cec54e
RS
730static void hostinfo_init(struct hostinfo *hi)
731{
732 memset(hi, 0, sizeof(*hi));
733 strbuf_init(&hi->hostname, 0);
734 strbuf_init(&hi->canon_hostname, 0);
735 strbuf_init(&hi->ip_address, 0);
736 strbuf_init(&hi->tcp_port, 0);
737}
738
739static void hostinfo_clear(struct hostinfo *hi)
740{
741 strbuf_release(&hi->hostname);
742 strbuf_release(&hi->canon_hostname);
743 strbuf_release(&hi->ip_address);
744 strbuf_release(&hi->tcp_port);
745}
dd467629 746
a43b68a1
EW
747static void set_keep_alive(int sockfd)
748{
749 int ka = 1;
750
49c58d86
EW
751 if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0) {
752 if (errno != ENOTSOCK)
753 logerror("unable to set SO_KEEPALIVE on socket: %s",
754 strerror(errno));
755 }
a43b68a1
EW
756}
757
f9c87be6 758static int execute(void)
a87e8be2 759{
74543a04 760 char *line = packet_buffer;
d819e4e6 761 int pktlen, len, i;
f9c87be6 762 char *addr = getenv("REMOTE_ADDR"), *port = getenv("REMOTE_PORT");
01cec54e 763 struct hostinfo hi;
dfe422d0 764 struct argv_array env = ARGV_ARRAY_INIT;
01cec54e
RS
765
766 hostinfo_init(&hi);
7d80694a 767
f9c87be6
EFL
768 if (addr)
769 loginfo("Connection from %s:%s", addr, port);
5b276ee4 770
a43b68a1 771 set_keep_alive(0);
960deccb 772 alarm(init_timeout ? init_timeout : timeout);
4981fe75 773 pktlen = packet_read(0, NULL, NULL, packet_buffer, sizeof(packet_buffer), 0);
960deccb 774 alarm(0);
7d80694a 775
5ad312be 776 len = strlen(line);
ed15e58e
JK
777 if (len && line[len-1] == '\n')
778 line[len-1] = 0;
7d80694a 779
dfe422d0 780 /* parse additional args hidden behind a NUL byte */
d433ed0b 781 if (len != pktlen)
dfe422d0 782 parse_extra_args(&hi, &env, line + len + 1, pktlen - len - 1);
49ba83fb 783
d819e4e6
JH
784 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
785 struct daemon_service *s = &(daemon_service[i]);
d12c24d2
JK
786 const char *arg;
787
788 if (skip_prefix(line, "git-", &arg) &&
789 skip_prefix(arg, s->name, &arg) &&
790 *arg++ == ' ') {
eb30aed7
JL
791 /*
792 * Note: The directory here is probably context sensitive,
793 * and might depend on the actual service being performed.
794 */
dfe422d0 795 int rc = run_service(arg, s, &hi, &env);
01cec54e 796 hostinfo_clear(&hi);
dfe422d0 797 argv_array_clear(&env);
01cec54e 798 return rc;
49ba83fb 799 }
d819e4e6 800 }
a87e8be2 801
01cec54e 802 hostinfo_clear(&hi);
dfe422d0 803 argv_array_clear(&env);
f8ff0c06 804 logerror("Protocol error: '%s'", line);
a87e8be2
LT
805 return -1;
806}
807
15515b73
EFL
808static int addrcmp(const struct sockaddr_storage *s1,
809 const struct sockaddr_storage *s2)
810{
3aff874a
BC
811 const struct sockaddr *sa1 = (const struct sockaddr*) s1;
812 const struct sockaddr *sa2 = (const struct sockaddr*) s2;
813
814 if (sa1->sa_family != sa2->sa_family)
815 return sa1->sa_family - sa2->sa_family;
816 if (sa1->sa_family == AF_INET)
15515b73
EFL
817 return memcmp(&((struct sockaddr_in *)s1)->sin_addr,
818 &((struct sockaddr_in *)s2)->sin_addr,
819 sizeof(struct in_addr));
820#ifndef NO_IPV6
3aff874a 821 if (sa1->sa_family == AF_INET6)
15515b73
EFL
822 return memcmp(&((struct sockaddr_in6 *)s1)->sin6_addr,
823 &((struct sockaddr_in6 *)s2)->sin6_addr,
824 sizeof(struct in6_addr));
825#endif
826 return 0;
827}
828
3bd62c21 829static int max_connections = 32;
66e631de 830
3bd62c21 831static unsigned int live_children;
66e631de 832
4d8fa916 833static struct child {
3bd62c21 834 struct child *next;
30e15602 835 struct child_process cld;
df076bdb 836 struct sockaddr_storage address;
3bd62c21 837} *firstborn;
66e631de 838
c295cf06 839static void add_child(struct child_process *cld, struct sockaddr *addr, socklen_t addrlen)
66e631de 840{
460c2010
JH
841 struct child *newborn, **cradle;
842
460c2010
JH
843 newborn = xcalloc(1, sizeof(*newborn));
844 live_children++;
30e15602 845 memcpy(&newborn->cld, cld, sizeof(*cld));
460c2010
JH
846 memcpy(&newborn->address, addr, addrlen);
847 for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next)
15515b73 848 if (!addrcmp(&(*cradle)->address, &newborn->address))
460c2010
JH
849 break;
850 newborn->next = *cradle;
851 *cradle = newborn;
66e631de
LT
852}
853
66e631de
LT
854/*
855 * This gets called if the number of connections grows
856 * past "max_connections".
857 *
3bd62c21 858 * We kill the newest connection from a duplicate IP.
66e631de 859 */
3bd62c21 860static void kill_some_child(void)
66e631de 861{
460c2010 862 const struct child *blanket, *next;
66e631de 863
460c2010
JH
864 if (!(blanket = firstborn))
865 return;
695605b5 866
460c2010 867 for (; (next = blanket->next); blanket = next)
15515b73 868 if (!addrcmp(&blanket->address, &next->address)) {
30e15602 869 kill(blanket->cld.pid, SIGTERM);
460c2010
JH
870 break;
871 }
a5a9126b
JS
872}
873
3bd62c21 874static void check_dead_children(void)
a87e8be2 875{
3bd62c21
SB
876 int status;
877 pid_t pid;
02d57da4 878
30e15602
EFL
879 struct child **cradle, *blanket;
880 for (cradle = &firstborn; (blanket = *cradle);)
881 if ((pid = waitpid(blanket->cld.pid, &status, WNOHANG)) > 1) {
882 const char *dead = "";
883 if (status)
884 dead = " (with error)";
885 loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead);
886
887 /* remove the child */
888 *cradle = blanket->next;
889 live_children--;
b1b49ff8 890 child_process_clear(&blanket->cld);
30e15602
EFL
891 free(blanket);
892 } else
893 cradle = &blanket->next;
02d57da4
LT
894}
895
850d2fec 896static struct argv_array cld_argv = ARGV_ARRAY_INIT;
c295cf06 897static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen)
02d57da4 898{
d3180279 899 struct child_process cld = CHILD_PROCESS_INIT;
02d57da4 900
3bd62c21
SB
901 if (max_connections && live_children >= max_connections) {
902 kill_some_child();
460c2010 903 sleep(1); /* give it some time to die */
3bd62c21
SB
904 check_dead_children();
905 if (live_children >= max_connections) {
906 close(incoming);
907 logerror("Too many children, dropping connection");
908 return;
909 }
910 }
02d57da4 911
f9c87be6 912 if (addr->sa_family == AF_INET) {
f063d38b 913 char buf[128] = "";
f9c87be6 914 struct sockaddr_in *sin_addr = (void *) addr;
f063d38b
JK
915 inet_ntop(addr->sa_family, &sin_addr->sin_addr, buf, sizeof(buf));
916 argv_array_pushf(&cld.env_array, "REMOTE_ADDR=%s", buf);
917 argv_array_pushf(&cld.env_array, "REMOTE_PORT=%d",
918 ntohs(sin_addr->sin_port));
f9c87be6 919#ifndef NO_IPV6
5d9cfa29 920 } else if (addr->sa_family == AF_INET6) {
f063d38b 921 char buf[128] = "";
f9c87be6 922 struct sockaddr_in6 *sin6_addr = (void *) addr;
f063d38b
JK
923 inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(buf));
924 argv_array_pushf(&cld.env_array, "REMOTE_ADDR=[%s]", buf);
925 argv_array_pushf(&cld.env_array, "REMOTE_PORT=%d",
926 ntohs(sin6_addr->sin6_port));
f9c87be6
EFL
927#endif
928 }
929
850d2fec 930 cld.argv = cld_argv.argv;
30e15602
EFL
931 cld.in = incoming;
932 cld.out = dup(incoming);
a87e8be2 933
30e15602
EFL
934 if (start_command(&cld))
935 logerror("unable to fork");
936 else
937 add_child(&cld, addr, addrlen);
a87e8be2
LT
938}
939
eaa94919
LT
940static void child_handler(int signo)
941{
460c2010
JH
942 /*
943 * Otherwise empty handler because systemcalls will get interrupted
695605b5
SB
944 * upon signal receipt
945 * SysV needs the handler to be rearmed
946 */
bd7b371e 947 signal(SIGCHLD, child_handler);
eaa94919
LT
948}
949
1955fabf
MW
950static int set_reuse_addr(int sockfd)
951{
952 int on = 1;
953
954 if (!reuseaddr)
955 return 0;
956 return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
957 &on, sizeof(on));
958}
959
2caa3215
AS
960struct socketlist {
961 int *list;
962 size_t nr;
963 size_t alloc;
964};
965
089d82e8
NTND
966static const char *ip2str(int family, struct sockaddr *sin, socklen_t len)
967{
968#ifdef NO_IPV6
969 static char ip[INET_ADDRSTRLEN];
970#else
971 static char ip[INET6_ADDRSTRLEN];
972#endif
973
974 switch (family) {
975#ifndef NO_IPV6
976 case AF_INET6:
977 inet_ntop(family, &((struct sockaddr_in6*)sin)->sin6_addr, ip, len);
978 break;
979#endif
980 case AF_INET:
981 inet_ntop(family, &((struct sockaddr_in*)sin)->sin_addr, ip, len);
982 break;
983 default:
5096d490 984 xsnprintf(ip, sizeof(ip), "<unknown>");
089d82e8
NTND
985 }
986 return ip;
987}
988
6573faff
PA
989#ifndef NO_IPV6
990
2caa3215 991static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
a87e8be2 992{
2caa3215 993 int socknum = 0;
df076bdb 994 char pbuf[NI_MAXSERV];
6573faff
PA
995 struct addrinfo hints, *ai0, *ai;
996 int gai;
20276889 997 long flags;
df076bdb 998
5096d490 999 xsnprintf(pbuf, sizeof(pbuf), "%d", listen_port);
df076bdb
YH
1000 memset(&hints, 0, sizeof(hints));
1001 hints.ai_family = AF_UNSPEC;
1002 hints.ai_socktype = SOCK_STREAM;
1003 hints.ai_protocol = IPPROTO_TCP;
1004 hints.ai_flags = AI_PASSIVE;
1005
dd467629 1006 gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0);
2caa3215
AS
1007 if (gai) {
1008 logerror("getaddrinfo() for %s failed: %s", listen_addr, gai_strerror(gai));
1009 return 0;
1010 }
df076bdb 1011
df076bdb
YH
1012 for (ai = ai0; ai; ai = ai->ai_next) {
1013 int sockfd;
df076bdb
YH
1014
1015 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1016 if (sockfd < 0)
1017 continue;
1018 if (sockfd >= FD_SETSIZE) {
df0daf8a 1019 logerror("Socket descriptor too large");
df076bdb
YH
1020 close(sockfd);
1021 continue;
1022 }
1023
1024#ifdef IPV6_V6ONLY
1025 if (ai->ai_family == AF_INET6) {
1026 int on = 1;
1027 setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
1028 &on, sizeof(on));
1029 /* Note: error is not fatal */
1030 }
1031#endif
1032
1955fabf 1033 if (set_reuse_addr(sockfd)) {
089d82e8 1034 logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
1955fabf 1035 close(sockfd);
0032d548 1036 continue;
1955fabf
MW
1037 }
1038
a43b68a1
EW
1039 set_keep_alive(sockfd);
1040
df076bdb 1041 if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
089d82e8
NTND
1042 logerror("Could not bind to %s: %s",
1043 ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
1044 strerror(errno));
df076bdb
YH
1045 close(sockfd);
1046 continue; /* not fatal */
1047 }
1048 if (listen(sockfd, 5) < 0) {
089d82e8
NTND
1049 logerror("Could not listen to %s: %s",
1050 ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
1051 strerror(errno));
df076bdb
YH
1052 close(sockfd);
1053 continue; /* not fatal */
1054 }
1055
20276889
AJ
1056 flags = fcntl(sockfd, F_GETFD, 0);
1057 if (flags >= 0)
1058 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
1059
2caa3215
AS
1060 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
1061 socklist->list[socklist->nr++] = sockfd;
1062 socknum++;
df076bdb
YH
1063 }
1064
1065 freeaddrinfo(ai0);
1066
6573faff
PA
1067 return socknum;
1068}
1069
1070#else /* NO_IPV6 */
1071
2caa3215 1072static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
6573faff
PA
1073{
1074 struct sockaddr_in sin;
1075 int sockfd;
20276889 1076 long flags;
6573faff 1077
dd467629
JL
1078 memset(&sin, 0, sizeof sin);
1079 sin.sin_family = AF_INET;
1080 sin.sin_port = htons(listen_port);
1081
1082 if (listen_addr) {
1083 /* Well, host better be an IP address here. */
1084 if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0)
1085 return 0;
1086 } else {
1087 sin.sin_addr.s_addr = htonl(INADDR_ANY);
1088 }
1089
6573faff
PA
1090 sockfd = socket(AF_INET, SOCK_STREAM, 0);
1091 if (sockfd < 0)
1092 return 0;
1093
1955fabf 1094 if (set_reuse_addr(sockfd)) {
089d82e8 1095 logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
1955fabf
MW
1096 close(sockfd);
1097 return 0;
1098 }
1099
a43b68a1
EW
1100 set_keep_alive(sockfd);
1101
6573faff 1102 if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
9d1b9aa9 1103 logerror("Could not bind to %s: %s",
089d82e8
NTND
1104 ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
1105 strerror(errno));
6573faff
PA
1106 close(sockfd);
1107 return 0;
1108 }
a87e8be2 1109
f35230fb 1110 if (listen(sockfd, 5) < 0) {
089d82e8
NTND
1111 logerror("Could not listen to %s: %s",
1112 ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
1113 strerror(errno));
f35230fb
PS
1114 close(sockfd);
1115 return 0;
1116 }
1117
20276889
AJ
1118 flags = fcntl(sockfd, F_GETFD, 0);
1119 if (flags >= 0)
1120 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
1121
2caa3215
AS
1122 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
1123 socklist->list[socklist->nr++] = sockfd;
f35230fb 1124 return 1;
6573faff
PA
1125}
1126
1127#endif
1128
3a3a29c1 1129static void socksetup(struct string_list *listen_addr, int listen_port, struct socketlist *socklist)
2caa3215 1130{
3a3a29c1
AS
1131 if (!listen_addr->nr)
1132 setup_named_sock(NULL, listen_port, socklist);
1133 else {
1134 int i, socknum;
1135 for (i = 0; i < listen_addr->nr; i++) {
1136 socknum = setup_named_sock(listen_addr->items[i].string,
1137 listen_port, socklist);
1138
1139 if (socknum == 0)
1140 logerror("unable to allocate any listen sockets for host %s on port %u",
1141 listen_addr->items[i].string, listen_port);
1142 }
1143 }
2caa3215
AS
1144}
1145
1146static int service_loop(struct socketlist *socklist)
6573faff
PA
1147{
1148 struct pollfd *pfd;
1149 int i;
1150
2caa3215 1151 pfd = xcalloc(socklist->nr, sizeof(struct pollfd));
6573faff 1152
2caa3215
AS
1153 for (i = 0; i < socklist->nr; i++) {
1154 pfd[i].fd = socklist->list[i];
6573faff
PA
1155 pfd[i].events = POLLIN;
1156 }
9220282a
PA
1157
1158 signal(SIGCHLD, child_handler);
a87e8be2
LT
1159
1160 for (;;) {
df076bdb 1161 int i;
6573faff 1162
695605b5
SB
1163 check_dead_children();
1164
2caa3215 1165 if (poll(pfd, socklist->nr, -1) < 0) {
1eef0b33 1166 if (errno != EINTR) {
df0daf8a 1167 logerror("Poll failed, resuming: %s",
1eef0b33
JH
1168 strerror(errno));
1169 sleep(1);
1170 }
df076bdb
YH
1171 continue;
1172 }
1173
2caa3215 1174 for (i = 0; i < socklist->nr; i++) {
6573faff 1175 if (pfd[i].revents & POLLIN) {
f9c87be6
EFL
1176 union {
1177 struct sockaddr sa;
1178 struct sockaddr_in sai;
1179#ifndef NO_IPV6
1180 struct sockaddr_in6 sai6;
1181#endif
1182 } ss;
c295cf06 1183 socklen_t sslen = sizeof(ss);
f9c87be6 1184 int incoming = accept(pfd[i].fd, &ss.sa, &sslen);
df076bdb
YH
1185 if (incoming < 0) {
1186 switch (errno) {
1187 case EAGAIN:
1188 case EINTR:
1189 case ECONNABORTED:
1190 continue;
1191 default:
d824cbba 1192 die_errno("accept returned");
df076bdb
YH
1193 }
1194 }
f9c87be6 1195 handle(incoming, &ss.sa, sslen);
a87e8be2
LT
1196 }
1197 }
a87e8be2
LT
1198 }
1199}
1200
a666b472
EFL
1201#ifdef NO_POSIX_GOODIES
1202
1203struct credentials;
1204
1205static void drop_privileges(struct credentials *cred)
1206{
1207 /* nothing */
1208}
1209
a666b472
EFL
1210static struct credentials *prepare_credentials(const char *user_name,
1211 const char *group_name)
1212{
1213 die("--user not supported on this platform");
1214}
1215
1216#else
1217
1218struct credentials {
1219 struct passwd *pass;
1220 gid_t gid;
1221};
1222
1223static void drop_privileges(struct credentials *cred)
1224{
1225 if (cred && (initgroups(cred->pass->pw_name, cred->gid) ||
1226 setgid (cred->gid) || setuid(cred->pass->pw_uid)))
1227 die("cannot drop privileges");
1228}
1229
1230static struct credentials *prepare_credentials(const char *user_name,
1231 const char *group_name)
1232{
1233 static struct credentials c;
1234
1235 c.pass = getpwnam(user_name);
1236 if (!c.pass)
1237 die("user not found - %s", user_name);
1238
1239 if (!group_name)
1240 c.gid = c.pass->pw_gid;
1241 else {
1242 struct group *group = getgrnam(group_name);
1243 if (!group)
1244 die("group not found - %s", group_name);
1245
1246 c.gid = group->gr_gid;
1247 }
1248
1249 return &c;
1250}
a666b472 1251#endif
a5262768 1252
a666b472
EFL
1253static int serve(struct string_list *listen_addr, int listen_port,
1254 struct credentials *cred)
6573faff 1255{
2caa3215 1256 struct socketlist socklist = { NULL, 0, 0 };
4ae22d96 1257
2caa3215
AS
1258 socksetup(listen_addr, listen_port, &socklist);
1259 if (socklist.nr == 0)
3a3a29c1
AS
1260 die("unable to allocate any listen sockets on port %u",
1261 listen_port);
4ae22d96 1262
a666b472 1263 drop_privileges(cred);
678dac6b 1264
f6a34cfb
CB
1265 loginfo("Ready to rumble");
1266
2caa3215 1267 return service_loop(&socklist);
4ae22d96 1268}
6573faff 1269
3f2e2297 1270int cmd_main(int argc, const char **argv)
a87e8be2 1271{
dd467629 1272 int listen_port = 0;
3a3a29c1 1273 struct string_list listen_addr = STRING_LIST_INIT_NODUP;
30e15602 1274 int serve_mode = 0, inetd_mode = 0;
678dac6b 1275 const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
a5262768 1276 int detach = 0;
a666b472 1277 struct credentials *cred = NULL;
a87e8be2
LT
1278 int i;
1279
1280 for (i = 1; i < argc; i++) {
3f2e2297 1281 const char *arg = argv[i];
ae021d87 1282 const char *v;
a87e8be2 1283
ae021d87
JK
1284 if (skip_prefix(arg, "--listen=", &v)) {
1285 string_list_append(&listen_addr, xstrdup_tolower(v));
6720e95b 1286 continue;
dd467629 1287 }
ae021d87 1288 if (skip_prefix(arg, "--port=", &v)) {
a87e8be2
LT
1289 char *end;
1290 unsigned long n;
ae021d87
JK
1291 n = strtoul(v, &end, 0);
1292 if (*v && !*end) {
dd467629 1293 listen_port = n;
a87e8be2
LT
1294 continue;
1295 }
1296 }
30e15602
EFL
1297 if (!strcmp(arg, "--serve")) {
1298 serve_mode = 1;
1299 continue;
1300 }
e64e1b79
LT
1301 if (!strcmp(arg, "--inetd")) {
1302 inetd_mode = 1;
1303 continue;
1304 }
f8ff0c06
PB
1305 if (!strcmp(arg, "--verbose")) {
1306 verbose = 1;
1307 continue;
1308 }
9048fe1c 1309 if (!strcmp(arg, "--syslog")) {
0c591cac 1310 log_destination = LOG_DESTINATION_SYSLOG;
9048fe1c
PB
1311 continue;
1312 }
0c591cac
LW
1313 if (skip_prefix(arg, "--log-destination=", &v)) {
1314 if (!strcmp(v, "syslog")) {
1315 log_destination = LOG_DESTINATION_SYSLOG;
1316 continue;
1317 } else if (!strcmp(v, "stderr")) {
1318 log_destination = LOG_DESTINATION_STDERR;
1319 continue;
1320 } else if (!strcmp(v, "none")) {
1321 log_destination = LOG_DESTINATION_NONE;
1322 continue;
1323 } else
1324 die("unknown log destination '%s'", v);
1325 }
4ae95682
PA
1326 if (!strcmp(arg, "--export-all")) {
1327 export_all_trees = 1;
1328 continue;
1329 }
ae021d87
JK
1330 if (skip_prefix(arg, "--access-hook=", &v)) {
1331 access_hook = v;
93741e4a
JH
1332 continue;
1333 }
ae021d87
JK
1334 if (skip_prefix(arg, "--timeout=", &v)) {
1335 timeout = atoi(v);
a8883288 1336 continue;
960deccb 1337 }
ae021d87
JK
1338 if (skip_prefix(arg, "--init-timeout=", &v)) {
1339 init_timeout = atoi(v);
a8883288 1340 continue;
960deccb 1341 }
ae021d87
JK
1342 if (skip_prefix(arg, "--max-connections=", &v)) {
1343 max_connections = atoi(v);
3bd62c21
SB
1344 if (max_connections < 0)
1345 max_connections = 0; /* unlimited */
1346 continue;
1347 }
4dbd1352
AE
1348 if (!strcmp(arg, "--strict-paths")) {
1349 strict_paths = 1;
1350 continue;
1351 }
ae021d87
JK
1352 if (skip_prefix(arg, "--base-path=", &v)) {
1353 base_path = v;
b21c31c9
PB
1354 continue;
1355 }
73a7a656
JA
1356 if (!strcmp(arg, "--base-path-relaxed")) {
1357 base_path_relaxed = 1;
1358 continue;
1359 }
ae021d87
JK
1360 if (skip_prefix(arg, "--interpolated-path=", &v)) {
1361 interpolated_path = v;
49ba83fb
JL
1362 continue;
1363 }
1955fabf
MW
1364 if (!strcmp(arg, "--reuseaddr")) {
1365 reuseaddr = 1;
1366 continue;
1367 }
603968d2
JH
1368 if (!strcmp(arg, "--user-path")) {
1369 user_path = "";
1370 continue;
1371 }
ae021d87
JK
1372 if (skip_prefix(arg, "--user-path=", &v)) {
1373 user_path = v;
603968d2
JH
1374 continue;
1375 }
ae021d87
JK
1376 if (skip_prefix(arg, "--pid-file=", &v)) {
1377 pid_file = v;
45ed5d7f
ML
1378 continue;
1379 }
a5262768
ML
1380 if (!strcmp(arg, "--detach")) {
1381 detach = 1;
a5262768
ML
1382 continue;
1383 }
ae021d87
JK
1384 if (skip_prefix(arg, "--user=", &v)) {
1385 user_name = v;
678dac6b
TS
1386 continue;
1387 }
ae021d87
JK
1388 if (skip_prefix(arg, "--group=", &v)) {
1389 group_name = v;
678dac6b
TS
1390 continue;
1391 }
ae021d87
JK
1392 if (skip_prefix(arg, "--enable=", &v)) {
1393 enable_service(v, 1);
d819e4e6
JH
1394 continue;
1395 }
ae021d87
JK
1396 if (skip_prefix(arg, "--disable=", &v)) {
1397 enable_service(v, 0);
d819e4e6
JH
1398 continue;
1399 }
ae021d87
JK
1400 if (skip_prefix(arg, "--allow-override=", &v)) {
1401 make_service_overridable(v, 1);
d819e4e6
JH
1402 continue;
1403 }
ae021d87
JK
1404 if (skip_prefix(arg, "--forbid-override=", &v)) {
1405 make_service_overridable(v, 0);
d819e4e6
JH
1406 continue;
1407 }
82246b76 1408 if (!strcmp(arg, "--informative-errors")) {
d5570f4d
JK
1409 informative_errors = 1;
1410 continue;
1411 }
82246b76 1412 if (!strcmp(arg, "--no-informative-errors")) {
d5570f4d
JK
1413 informative_errors = 0;
1414 continue;
1415 }
4ae95682
PA
1416 if (!strcmp(arg, "--")) {
1417 ok_paths = &argv[i+1];
1418 break;
1419 } else if (arg[0] != '-') {
1420 ok_paths = &argv[i];
1421 break;
1422 }
e64e1b79 1423
a87e8be2
LT
1424 usage(daemon_usage);
1425 }
1426
0c591cac
LW
1427 if (log_destination == LOG_DESTINATION_UNSET) {
1428 if (inetd_mode || detach)
1429 log_destination = LOG_DESTINATION_SYSLOG;
1430 else
1431 log_destination = LOG_DESTINATION_STDERR;
1432 }
1433
1434 if (log_destination == LOG_DESTINATION_SYSLOG) {
6a992e9e 1435 openlog("git-daemon", LOG_PID, LOG_DAEMON);
22665bba 1436 set_die_routine(daemon_die);
460c2010 1437 } else
48196afd 1438 /* avoid splitting a message in the middle */
48cfaea1 1439 setvbuf(stderr, NULL, _IOFBF, 4096);
22665bba 1440
9cddf56e
EFL
1441 if (inetd_mode && (detach || group_name || user_name))
1442 die("--detach, --user and --group are incompatible with --inetd");
678dac6b 1443
3a3a29c1 1444 if (inetd_mode && (listen_port || (listen_addr.nr > 0)))
dd467629
JL
1445 die("--listen= and --port= are incompatible with --inetd");
1446 else if (listen_port == 0)
1447 listen_port = DEFAULT_GIT_PORT;
1448
678dac6b
TS
1449 if (group_name && !user_name)
1450 die("--group supplied without --user");
1451
a666b472
EFL
1452 if (user_name)
1453 cred = prepare_credentials(user_name, group_name);
678dac6b 1454
ad8b4f56
ML
1455 if (strict_paths && (!ok_paths || !*ok_paths))
1456 die("option --strict-paths requires a whitelist");
1457
90b4a71c
JH
1458 if (base_path && !is_directory(base_path))
1459 die("base-path '%s' does not exist or is not a directory",
1460 base_path);
20632071 1461
e67d906d 1462 if (log_destination != LOG_DESTINATION_STDERR) {
30e15602
EFL
1463 if (!freopen("/dev/null", "w", stderr))
1464 die_errno("failed to redirect stderr to /dev/null");
1465 }
1466
f9c87be6
EFL
1467 if (inetd_mode || serve_mode)
1468 return execute();
bce8230d 1469
de0957ce
NTND
1470 if (detach) {
1471 if (daemonize())
1472 die("--detach not supported on this platform");
57f5d52a 1473 }
258e93a1 1474
45ed5d7f 1475 if (pid_file)
1f76a10b 1476 write_file(pid_file, "%"PRIuMAX, (uintmax_t) getpid());
45ed5d7f 1477
30e15602 1478 /* prepare argv for serving-processes */
850d2fec
JK
1479 argv_array_push(&cld_argv, argv[0]); /* git-daemon */
1480 argv_array_push(&cld_argv, "--serve");
081f84ee 1481 for (i = 1; i < argc; ++i)
850d2fec 1482 argv_array_push(&cld_argv, argv[i]);
30e15602 1483
a666b472 1484 return serve(&listen_addr, listen_port, cred);
a87e8be2 1485}