daemon: use socklen_t
[git/git.git] / daemon.c
CommitLineData
979e32fa 1#include "cache.h"
85023577 2#include "pkt-line.h"
77cb17e9 3#include "exec_cmd.h"
5d87dd4f
JS
4#include "run-command.h"
5#include "strbuf.h"
3a3a29c1 6#include "string-list.h"
f8ff0c06 7
695dffe2
JS
8#ifndef HOST_NAME_MAX
9#define HOST_NAME_MAX 256
10#endif
11
415e7b87
PW
12#ifndef NI_MAXSERV
13#define NI_MAXSERV 32
14#endif
15
9048fe1c 16static int log_syslog;
f8ff0c06 17static int verbose;
1955fabf 18static int reuseaddr;
f8ff0c06 19
960deccb 20static const char daemon_usage[] =
1b1dd23f 21"git daemon [--verbose] [--syslog] [--export-all]\n"
62b4698e
ŠN
22" [--timeout=<n>] [--init-timeout=<n>] [--max-connections=<n>]\n"
23" [--strict-paths] [--base-path=<path>] [--base-path-relaxed]\n"
24" [--user-path | --user-path=<path>]\n"
25" [--interpolated-path=<path>]\n"
26" [--reuseaddr] [--detach] [--pid-file=<file>]\n"
27" [--(enable|disable|allow-override|forbid-override)=<service>]\n"
28" [--inetd | [--listen=<host_or_ipaddr>] [--port=<n>]\n"
29" [--user=<user> [--group=<group>]]\n"
30" [<directory>...]";
4ae95682
PA
31
32/* List of acceptable pathname prefixes */
96f1e58f
DR
33static char **ok_paths;
34static int strict_paths;
4ae95682
PA
35
36/* If this is set, git-daemon-export-ok is not required */
96f1e58f 37static int export_all_trees;
f8ff0c06 38
b21c31c9 39/* Take all paths relative to this one if non-NULL */
96f1e58f 40static char *base_path;
49ba83fb 41static char *interpolated_path;
73a7a656 42static int base_path_relaxed;
49ba83fb
JL
43
44/* Flag indicating client sent extra args. */
45static int saw_extended_args;
b21c31c9 46
603968d2
JH
47/* If defined, ~user notation is allowed and the string is inserted
48 * after ~user/. E.g. a request to git://host/~alice/frotz would
49 * go to /home/alice/pub_git/frotz with --user-path=pub_git.
50 */
96f1e58f 51static const char *user_path;
603968d2 52
960deccb 53/* Timeout, and initial timeout */
96f1e58f
DR
54static unsigned int timeout;
55static unsigned int init_timeout;
f8ff0c06 56
9d7ca667
RS
57static char *hostname;
58static char *canon_hostname;
59static char *ip_address;
60static char *tcp_port;
49ba83fb 61
9048fe1c 62static void logreport(int priority, const char *err, va_list params)
f8ff0c06 63{
9048fe1c 64 if (log_syslog) {
6a992e9e
SB
65 char buf[1024];
66 vsnprintf(buf, sizeof(buf), err, params);
9048fe1c 67 syslog(priority, "%s", buf);
460c2010
JH
68 } else {
69 /*
48cfaea1 70 * Since stderr is set to buffered mode, the
6a992e9e 71 * logging of different processes will not overlap
48cfaea1 72 * unless they overflow the (rather big) buffers.
6a992e9e 73 */
85e72830 74 fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid());
6a992e9e
SB
75 vfprintf(stderr, err, params);
76 fputc('\n', stderr);
48cfaea1 77 fflush(stderr);
6a992e9e 78 }
f8ff0c06
PB
79}
80
28bea9e5 81__attribute__((format (printf, 1, 2)))
cdda4745 82static void logerror(const char *err, ...)
f8ff0c06
PB
83{
84 va_list params;
85 va_start(params, err);
9048fe1c 86 logreport(LOG_ERR, err, params);
f8ff0c06
PB
87 va_end(params);
88}
89
28bea9e5 90__attribute__((format (printf, 1, 2)))
cdda4745 91static void loginfo(const char *err, ...)
f8ff0c06
PB
92{
93 va_list params;
94 if (!verbose)
95 return;
96 va_start(params, err);
9048fe1c 97 logreport(LOG_INFO, err, params);
f8ff0c06
PB
98 va_end(params);
99}
a87e8be2 100
ad8b4f56
ML
101static void NORETURN daemon_die(const char *err, va_list params)
102{
103 logreport(LOG_ERR, err, params);
104 exit(1);
105}
106
a47551c3 107static char *path_ok(char *directory)
4ae95682 108{
603968d2 109 static char rpath[PATH_MAX];
49ba83fb 110 static char interp_path[PATH_MAX];
d79374c7 111 char *path;
49ba83fb
JL
112 char *dir;
113
9d7ca667 114 dir = directory;
d79374c7 115
34b6cb8b 116 if (daemon_avoid_alias(dir)) {
d79374c7
JH
117 logerror("'%s': aliased", dir);
118 return NULL;
119 }
120
603968d2
JH
121 if (*dir == '~') {
122 if (!user_path) {
123 logerror("'%s': User-path not allowed", dir);
124 return NULL;
125 }
126 if (*user_path) {
127 /* Got either "~alice" or "~alice/foo";
128 * rewrite them to "~alice/%s" or
129 * "~alice/%s/foo".
130 */
131 int namlen, restlen = strlen(dir);
132 char *slash = strchr(dir, '/');
133 if (!slash)
134 slash = dir + restlen;
135 namlen = slash - dir;
136 restlen -= namlen;
137 loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
138 snprintf(rpath, PATH_MAX, "%.*s/%s%.*s",
139 namlen, dir, user_path, restlen, slash);
140 dir = rpath;
141 }
142 }
49ba83fb 143 else if (interpolated_path && saw_extended_args) {
9d7ca667 144 struct strbuf expanded_path = STRBUF_INIT;
66dbfd55
GV
145 struct strbuf_expand_dict_entry dict[6];
146
147 dict[0].placeholder = "H"; dict[0].value = hostname;
148 dict[1].placeholder = "CH"; dict[1].value = canon_hostname;
149 dict[2].placeholder = "IP"; dict[2].value = ip_address;
150 dict[3].placeholder = "P"; dict[3].value = tcp_port;
151 dict[4].placeholder = "D"; dict[4].value = directory;
152 dict[5].placeholder = NULL; dict[5].value = NULL;
49ba83fb
JL
153 if (*dir != '/') {
154 /* Allow only absolute */
155 logerror("'%s': Non-absolute path denied (interpolated-path active)", dir);
156 return NULL;
157 }
158
9d7ca667
RS
159 strbuf_expand(&expanded_path, interpolated_path,
160 strbuf_expand_dict_cb, &dict);
161 strlcpy(interp_path, expanded_path.buf, PATH_MAX);
162 strbuf_release(&expanded_path);
49ba83fb
JL
163 loginfo("Interpolated dir '%s'", interp_path);
164
165 dir = interp_path;
166 }
603968d2
JH
167 else if (base_path) {
168 if (*dir != '/') {
169 /* Allow only absolute */
1fda3d55 170 logerror("'%s': Non-absolute path denied (base-path active)", dir);
b21c31c9
PB
171 return NULL;
172 }
49ba83fb
JL
173 snprintf(rpath, PATH_MAX, "%s%s", base_path, dir);
174 dir = rpath;
b21c31c9
PB
175 }
176
a583971f
RS
177 path = enter_repo(dir, strict_paths);
178 if (!path && base_path && base_path_relaxed) {
73a7a656
JA
179 /*
180 * if we fail and base_path_relaxed is enabled, try without
181 * prefixing the base path
182 */
a583971f
RS
183 dir = directory;
184 path = enter_repo(dir, strict_paths);
185 }
3e04c62d 186
4dbd1352 187 if (!path) {
05ac6b34 188 logerror("'%s' does not appear to be a git repository", dir);
4dbd1352 189 return NULL;
4ae95682
PA
190 }
191
192 if ( ok_paths && *ok_paths ) {
ce335fe0 193 char **pp;
4dbd1352 194 int pathlen = strlen(path);
4ae95682 195
ce335fe0 196 /* The validation is done on the paths after enter_repo
a6080a0a 197 * appends optional {.git,.git/.git} and friends, but
d79374c7
JH
198 * it does not use getcwd(). So if your /pub is
199 * a symlink to /mnt/pub, you can whitelist /pub and
200 * do not have to say /mnt/pub.
201 * Do not say /pub/.
ce335fe0 202 */
4ae95682
PA
203 for ( pp = ok_paths ; *pp ; pp++ ) {
204 int len = strlen(*pp);
ce335fe0
JH
205 if (len <= pathlen &&
206 !memcmp(*pp, path, len) &&
207 (path[len] == '\0' ||
208 (!strict_paths && path[len] == '/')))
209 return path;
4ae95682 210 }
4dbd1352
AE
211 }
212 else {
213 /* be backwards compatible */
214 if (!strict_paths)
215 return path;
4ae95682
PA
216 }
217
4dbd1352
AE
218 logerror("'%s': not in whitelist", path);
219 return NULL; /* Fallthrough. Deny by default */
4ae95682 220}
a87e8be2 221
d819e4e6
JH
222typedef int (*daemon_service_fn)(void);
223struct daemon_service {
224 const char *name;
225 const char *config_name;
226 daemon_service_fn fn;
227 int enabled;
228 int overridable;
229};
230
231static struct daemon_service *service_looking_at;
232static int service_enabled;
233
ef90d6d4 234static int git_daemon_config(const char *var, const char *value, void *cb)
d819e4e6 235{
cc44c765 236 if (!prefixcmp(var, "daemon.") &&
d819e4e6
JH
237 !strcmp(var + 7, service_looking_at->config_name)) {
238 service_enabled = git_config_bool(var, value);
239 return 0;
240 }
241
242 /* we are not interested in parsing any other configuration here */
243 return 0;
244}
245
a47551c3 246static int run_service(char *dir, struct daemon_service *service)
a87e8be2 247{
4dbd1352 248 const char *path;
d819e4e6
JH
249 int enabled = service->enabled;
250
a47551c3 251 loginfo("Request %s for '%s'", service->name, dir);
4dbd1352 252
d819e4e6
JH
253 if (!enabled && !service->overridable) {
254 logerror("'%s': service not enabled.", service->name);
255 errno = EACCES;
256 return -1;
257 }
4ae95682 258
a47551c3 259 if (!(path = path_ok(dir)))
a87e8be2 260 return -1;
47888f0f 261
a87e8be2
LT
262 /*
263 * Security on the cheap.
264 *
a935c397 265 * We want a readable HEAD, usable "objects" directory, and
a87e8be2
LT
266 * a "git-daemon-export-ok" flag that says that the other side
267 * is ok with us doing this.
4dbd1352
AE
268 *
269 * path_ok() uses enter_repo() and does whitelist checking.
270 * We only need to make sure the repository is exported.
a87e8be2 271 */
4dbd1352 272
3e04c62d 273 if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
4dbd1352 274 logerror("'%s': repository not exported.", path);
3e04c62d
PA
275 errno = EACCES;
276 return -1;
277 }
278
d819e4e6
JH
279 if (service->overridable) {
280 service_looking_at = service;
281 service_enabled = -1;
ef90d6d4 282 git_config(git_daemon_config, NULL);
d819e4e6
JH
283 if (0 <= service_enabled)
284 enabled = service_enabled;
285 }
286 if (!enabled) {
287 logerror("'%s': service not enabled for '%s'",
288 service->name, path);
289 errno = EACCES;
290 return -1;
291 }
292
02d57da4
LT
293 /*
294 * We'll ignore SIGTERM from now on, we have a
295 * good client.
296 */
297 signal(SIGTERM, SIG_IGN);
298
d819e4e6
JH
299 return service->fn();
300}
301
5d87dd4f
JS
302static void copy_to_log(int fd)
303{
304 struct strbuf line = STRBUF_INIT;
305 FILE *fp;
306
307 fp = fdopen(fd, "r");
308 if (fp == NULL) {
309 logerror("fdopen of error channel failed");
310 close(fd);
311 return;
312 }
313
314 while (strbuf_getline(&line, fp, '\n') != EOF) {
315 logerror("%s", line.buf);
316 strbuf_setlen(&line, 0);
317 }
318
319 strbuf_release(&line);
320 fclose(fp);
321}
322
323static int run_service_command(const char **argv)
324{
325 struct child_process cld;
326
327 memset(&cld, 0, sizeof(cld));
328 cld.argv = argv;
329 cld.git_cmd = 1;
330 cld.err = -1;
331 if (start_command(&cld))
332 return -1;
333
334 close(0);
335 close(1);
336
337 copy_to_log(cld.err);
338
339 return finish_command(&cld);
340}
341
d819e4e6
JH
342static int upload_pack(void)
343{
344 /* Timeout as string */
345 char timeout_buf[64];
66dbfd55
GV
346 const char *argv[] = { "upload-pack", "--strict", NULL, ".", NULL };
347
348 argv[2] = timeout_buf;
d819e4e6 349
960deccb 350 snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout);
5d87dd4f 351 return run_service_command(argv);
a87e8be2
LT
352}
353
39345a21
FBH
354static int upload_archive(void)
355{
5d87dd4f
JS
356 static const char *argv[] = { "upload-archive", ".", NULL };
357 return run_service_command(argv);
39345a21
FBH
358}
359
4b3b1e1e
LT
360static int receive_pack(void)
361{
5d87dd4f
JS
362 static const char *argv[] = { "receive-pack", ".", NULL };
363 return run_service_command(argv);
4b3b1e1e
LT
364}
365
d819e4e6 366static struct daemon_service daemon_service[] = {
39345a21 367 { "upload-archive", "uploadarch", upload_archive, 0, 1 },
d819e4e6 368 { "upload-pack", "uploadpack", upload_pack, 1, 1 },
4b3b1e1e 369 { "receive-pack", "receivepack", receive_pack, 0, 1 },
d819e4e6
JH
370};
371
f3fa1838
JH
372static void enable_service(const char *name, int ena)
373{
d819e4e6
JH
374 int i;
375 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
376 if (!strcmp(daemon_service[i].name, name)) {
377 daemon_service[i].enabled = ena;
378 return;
379 }
380 }
381 die("No such service %s", name);
382}
383
f3fa1838
JH
384static void make_service_overridable(const char *name, int ena)
385{
d819e4e6
JH
386 int i;
387 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
388 if (!strcmp(daemon_service[i].name, name)) {
389 daemon_service[i].overridable = ena;
390 return;
391 }
392 }
393 die("No such service %s", name);
394}
395
6720e95b
RS
396static char *xstrdup_tolower(const char *str)
397{
398 char *p, *dup = xstrdup(str);
399 for (p = dup; *p; p++)
400 *p = tolower(*p);
401 return dup;
402}
403
e8dbd76d
IL
404static void parse_host_and_port(char *hostport, char **host,
405 char **port)
406{
407 if (*hostport == '[') {
408 char *end;
409
410 end = strchr(hostport, ']');
411 if (!end)
9517e6b8 412 die("Invalid request ('[' without ']')");
e8dbd76d
IL
413 *end = '\0';
414 *host = hostport + 1;
415 if (!end[1])
416 *port = NULL;
417 else if (end[1] == ':')
418 *port = end + 2;
419 else
420 die("Garbage after end of host part");
421 } else {
422 *host = hostport;
423 *port = strrchr(hostport, ':');
424 if (*port) {
e9bd3235 425 **port = '\0';
e8dbd76d
IL
426 ++*port;
427 }
428 }
429}
430
eb30aed7 431/*
73bb33a9 432 * Read the host as supplied by the client connection.
eb30aed7 433 */
73bb33a9 434static void parse_host_arg(char *extra_args, int buflen)
49ba83fb
JL
435{
436 char *val;
437 int vallen;
438 char *end = extra_args + buflen;
439
73bb33a9 440 if (extra_args < end && *extra_args) {
49ba83fb
JL
441 saw_extended_args = 1;
442 if (strncasecmp("host=", extra_args, 5) == 0) {
443 val = extra_args + 5;
444 vallen = strlen(val) + 1;
445 if (*val) {
eb30aed7 446 /* Split <host>:<port> at colon. */
e8dbd76d
IL
447 char *host;
448 char *port;
449 parse_host_and_port(val, &host, &port);
dd467629 450 if (port) {
9d7ca667
RS
451 free(tcp_port);
452 tcp_port = xstrdup(port);
dd467629 453 }
9d7ca667 454 free(hostname);
6720e95b 455 hostname = xstrdup_tolower(host);
49ba83fb 456 }
eb30aed7 457
49ba83fb
JL
458 /* On to the next one */
459 extra_args = val + vallen;
460 }
73bb33a9
SP
461 if (extra_args < end && *extra_args)
462 die("Invalid request");
49ba83fb 463 }
dd467629 464
dd467629
JL
465 /*
466 * Locate canonical hostname and its IP address.
467 */
6720e95b 468 if (hostname) {
dd467629 469#ifndef NO_IPV6
dd467629 470 struct addrinfo hints;
3e8a00ae 471 struct addrinfo *ai;
dd467629
JL
472 int gai;
473 static char addrbuf[HOST_NAME_MAX + 1];
474
475 memset(&hints, 0, sizeof(hints));
476 hints.ai_flags = AI_CANONNAME;
477
2af202be 478 gai = getaddrinfo(hostname, NULL, &hints, &ai);
dd467629 479 if (!gai) {
3e8a00ae
BK
480 struct sockaddr_in *sin_addr = (void *)ai->ai_addr;
481
482 inet_ntop(AF_INET, &sin_addr->sin_addr,
483 addrbuf, sizeof(addrbuf));
484 free(ip_address);
485 ip_address = xstrdup(addrbuf);
486
487 free(canon_hostname);
488 canon_hostname = xstrdup(ai->ai_canonname ?
489 ai->ai_canonname : ip_address);
490
491 freeaddrinfo(ai);
dd467629 492 }
dd467629 493#else
dd467629
JL
494 struct hostent *hent;
495 struct sockaddr_in sa;
496 char **ap;
497 static char addrbuf[HOST_NAME_MAX + 1];
498
9d7ca667 499 hent = gethostbyname(hostname);
dd467629
JL
500
501 ap = hent->h_addr_list;
502 memset(&sa, 0, sizeof sa);
503 sa.sin_family = hent->h_addrtype;
504 sa.sin_port = htons(0);
505 memcpy(&sa.sin_addr, *ap, hent->h_length);
506
507 inet_ntop(hent->h_addrtype, &sa.sin_addr,
508 addrbuf, sizeof(addrbuf));
eb30aed7 509
9d7ca667
RS
510 free(canon_hostname);
511 canon_hostname = xstrdup(hent->h_name);
512 free(ip_address);
513 ip_address = xstrdup(addrbuf);
dd467629 514#endif
6720e95b 515 }
dd467629
JL
516}
517
518
f9c87be6 519static int execute(void)
a87e8be2 520{
7d80694a 521 static char line[1000];
d819e4e6 522 int pktlen, len, i;
f9c87be6 523 char *addr = getenv("REMOTE_ADDR"), *port = getenv("REMOTE_PORT");
7d80694a 524
f9c87be6
EFL
525 if (addr)
526 loginfo("Connection from %s:%s", addr, port);
5b276ee4 527
960deccb 528 alarm(init_timeout ? init_timeout : timeout);
5ad312be 529 pktlen = packet_read_line(0, line, sizeof(line));
960deccb 530 alarm(0);
7d80694a 531
5ad312be
JL
532 len = strlen(line);
533 if (pktlen != len)
534 loginfo("Extended attributes (%d bytes) exist <%.*s>",
535 (int) pktlen - len,
536 (int) pktlen - len, line + len + 1);
83543a24 537 if (len && line[len-1] == '\n') {
7d80694a 538 line[--len] = 0;
83543a24
JH
539 pktlen--;
540 }
7d80694a 541
9d7ca667
RS
542 free(hostname);
543 free(canon_hostname);
544 free(ip_address);
545 free(tcp_port);
a47551c3 546 hostname = canon_hostname = ip_address = tcp_port = NULL;
eb30aed7 547
d433ed0b 548 if (len != pktlen)
73bb33a9 549 parse_host_arg(line + len + 1, pktlen - len - 1);
49ba83fb 550
d819e4e6
JH
551 for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
552 struct daemon_service *s = &(daemon_service[i]);
553 int namelen = strlen(s->name);
599065a3 554 if (!prefixcmp(line, "git-") &&
d819e4e6 555 !strncmp(s->name, line + 4, namelen) &&
49ba83fb 556 line[namelen + 4] == ' ') {
eb30aed7
JL
557 /*
558 * Note: The directory here is probably context sensitive,
559 * and might depend on the actual service being performed.
560 */
a47551c3 561 return run_service(line + namelen + 5, s);
49ba83fb 562 }
d819e4e6 563 }
a87e8be2 564
f8ff0c06 565 logerror("Protocol error: '%s'", line);
a87e8be2
LT
566 return -1;
567}
568
15515b73
EFL
569static int addrcmp(const struct sockaddr_storage *s1,
570 const struct sockaddr_storage *s2)
571{
3aff874a
BC
572 const struct sockaddr *sa1 = (const struct sockaddr*) s1;
573 const struct sockaddr *sa2 = (const struct sockaddr*) s2;
574
575 if (sa1->sa_family != sa2->sa_family)
576 return sa1->sa_family - sa2->sa_family;
577 if (sa1->sa_family == AF_INET)
15515b73
EFL
578 return memcmp(&((struct sockaddr_in *)s1)->sin_addr,
579 &((struct sockaddr_in *)s2)->sin_addr,
580 sizeof(struct in_addr));
581#ifndef NO_IPV6
3aff874a 582 if (sa1->sa_family == AF_INET6)
15515b73
EFL
583 return memcmp(&((struct sockaddr_in6 *)s1)->sin6_addr,
584 &((struct sockaddr_in6 *)s2)->sin6_addr,
585 sizeof(struct in6_addr));
586#endif
587 return 0;
588}
589
3bd62c21 590static int max_connections = 32;
66e631de 591
3bd62c21 592static unsigned int live_children;
66e631de 593
4d8fa916 594static struct child {
3bd62c21 595 struct child *next;
30e15602 596 struct child_process cld;
df076bdb 597 struct sockaddr_storage address;
3bd62c21 598} *firstborn;
66e631de 599
c295cf06 600static void add_child(struct child_process *cld, struct sockaddr *addr, socklen_t addrlen)
66e631de 601{
460c2010
JH
602 struct child *newborn, **cradle;
603
460c2010
JH
604 newborn = xcalloc(1, sizeof(*newborn));
605 live_children++;
30e15602 606 memcpy(&newborn->cld, cld, sizeof(*cld));
460c2010
JH
607 memcpy(&newborn->address, addr, addrlen);
608 for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next)
15515b73 609 if (!addrcmp(&(*cradle)->address, &newborn->address))
460c2010
JH
610 break;
611 newborn->next = *cradle;
612 *cradle = newborn;
66e631de
LT
613}
614
66e631de
LT
615/*
616 * This gets called if the number of connections grows
617 * past "max_connections".
618 *
3bd62c21 619 * We kill the newest connection from a duplicate IP.
66e631de 620 */
3bd62c21 621static void kill_some_child(void)
66e631de 622{
460c2010 623 const struct child *blanket, *next;
66e631de 624
460c2010
JH
625 if (!(blanket = firstborn))
626 return;
695605b5 627
460c2010 628 for (; (next = blanket->next); blanket = next)
15515b73 629 if (!addrcmp(&blanket->address, &next->address)) {
30e15602 630 kill(blanket->cld.pid, SIGTERM);
460c2010
JH
631 break;
632 }
a5a9126b
JS
633}
634
3bd62c21 635static void check_dead_children(void)
a87e8be2 636{
3bd62c21
SB
637 int status;
638 pid_t pid;
02d57da4 639
30e15602
EFL
640 struct child **cradle, *blanket;
641 for (cradle = &firstborn; (blanket = *cradle);)
642 if ((pid = waitpid(blanket->cld.pid, &status, WNOHANG)) > 1) {
643 const char *dead = "";
644 if (status)
645 dead = " (with error)";
646 loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead);
647
648 /* remove the child */
649 *cradle = blanket->next;
650 live_children--;
651 free(blanket);
652 } else
653 cradle = &blanket->next;
02d57da4
LT
654}
655
30e15602 656static char **cld_argv;
c295cf06 657static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen)
02d57da4 658{
30e15602 659 struct child_process cld = { 0 };
f9c87be6
EFL
660 char addrbuf[300] = "REMOTE_ADDR=", portbuf[300];
661 char *env[] = { addrbuf, portbuf, NULL };
02d57da4 662
3bd62c21
SB
663 if (max_connections && live_children >= max_connections) {
664 kill_some_child();
460c2010 665 sleep(1); /* give it some time to die */
3bd62c21
SB
666 check_dead_children();
667 if (live_children >= max_connections) {
668 close(incoming);
669 logerror("Too many children, dropping connection");
670 return;
671 }
672 }
02d57da4 673
f9c87be6
EFL
674 if (addr->sa_family == AF_INET) {
675 struct sockaddr_in *sin_addr = (void *) addr;
676 inet_ntop(addr->sa_family, &sin_addr->sin_addr, addrbuf + 12,
677 sizeof(addrbuf) - 12);
678 snprintf(portbuf, sizeof(portbuf), "REMOTE_PORT=%d",
679 ntohs(sin_addr->sin_port));
680#ifndef NO_IPV6
681 } else if (addr && addr->sa_family == AF_INET6) {
682 struct sockaddr_in6 *sin6_addr = (void *) addr;
683
684 char *buf = addrbuf + 12;
685 *buf++ = '['; *buf = '\0'; /* stpcpy() is cool */
686 inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf,
687 sizeof(addrbuf) - 13);
688 strcat(buf, "]");
689
690 snprintf(portbuf, sizeof(portbuf), "REMOTE_PORT=%d",
691 ntohs(sin6_addr->sin6_port));
692#endif
693 }
694
695 cld.env = (const char **)env;
30e15602
EFL
696 cld.argv = (const char **)cld_argv;
697 cld.in = incoming;
698 cld.out = dup(incoming);
a87e8be2 699
30e15602
EFL
700 if (start_command(&cld))
701 logerror("unable to fork");
702 else
703 add_child(&cld, addr, addrlen);
a87e8be2 704 close(incoming);
a87e8be2
LT
705}
706
eaa94919
LT
707static void child_handler(int signo)
708{
460c2010
JH
709 /*
710 * Otherwise empty handler because systemcalls will get interrupted
695605b5
SB
711 * upon signal receipt
712 * SysV needs the handler to be rearmed
713 */
bd7b371e 714 signal(SIGCHLD, child_handler);
eaa94919
LT
715}
716
1955fabf
MW
717static int set_reuse_addr(int sockfd)
718{
719 int on = 1;
720
721 if (!reuseaddr)
722 return 0;
723 return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
724 &on, sizeof(on));
725}
726
2caa3215
AS
727struct socketlist {
728 int *list;
729 size_t nr;
730 size_t alloc;
731};
732
6573faff
PA
733#ifndef NO_IPV6
734
2caa3215 735static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
a87e8be2 736{
2caa3215 737 int socknum = 0;
df076bdb 738 int maxfd = -1;
df076bdb 739 char pbuf[NI_MAXSERV];
6573faff
PA
740 struct addrinfo hints, *ai0, *ai;
741 int gai;
20276889 742 long flags;
df076bdb 743
dd467629 744 sprintf(pbuf, "%d", listen_port);
df076bdb
YH
745 memset(&hints, 0, sizeof(hints));
746 hints.ai_family = AF_UNSPEC;
747 hints.ai_socktype = SOCK_STREAM;
748 hints.ai_protocol = IPPROTO_TCP;
749 hints.ai_flags = AI_PASSIVE;
750
dd467629 751 gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0);
2caa3215
AS
752 if (gai) {
753 logerror("getaddrinfo() for %s failed: %s", listen_addr, gai_strerror(gai));
754 return 0;
755 }
df076bdb 756
df076bdb
YH
757 for (ai = ai0; ai; ai = ai->ai_next) {
758 int sockfd;
df076bdb
YH
759
760 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
761 if (sockfd < 0)
762 continue;
763 if (sockfd >= FD_SETSIZE) {
df0daf8a 764 logerror("Socket descriptor too large");
df076bdb
YH
765 close(sockfd);
766 continue;
767 }
768
769#ifdef IPV6_V6ONLY
770 if (ai->ai_family == AF_INET6) {
771 int on = 1;
772 setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
773 &on, sizeof(on));
774 /* Note: error is not fatal */
775 }
776#endif
777
1955fabf
MW
778 if (set_reuse_addr(sockfd)) {
779 close(sockfd);
0032d548 780 continue;
1955fabf
MW
781 }
782
df076bdb
YH
783 if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
784 close(sockfd);
785 continue; /* not fatal */
786 }
787 if (listen(sockfd, 5) < 0) {
788 close(sockfd);
789 continue; /* not fatal */
790 }
791
20276889
AJ
792 flags = fcntl(sockfd, F_GETFD, 0);
793 if (flags >= 0)
794 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
795
2caa3215
AS
796 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
797 socklist->list[socklist->nr++] = sockfd;
798 socknum++;
df076bdb 799
df076bdb
YH
800 if (maxfd < sockfd)
801 maxfd = sockfd;
802 }
803
804 freeaddrinfo(ai0);
805
6573faff
PA
806 return socknum;
807}
808
809#else /* NO_IPV6 */
810
2caa3215 811static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
6573faff
PA
812{
813 struct sockaddr_in sin;
814 int sockfd;
20276889 815 long flags;
6573faff 816
dd467629
JL
817 memset(&sin, 0, sizeof sin);
818 sin.sin_family = AF_INET;
819 sin.sin_port = htons(listen_port);
820
821 if (listen_addr) {
822 /* Well, host better be an IP address here. */
823 if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0)
824 return 0;
825 } else {
826 sin.sin_addr.s_addr = htonl(INADDR_ANY);
827 }
828
6573faff
PA
829 sockfd = socket(AF_INET, SOCK_STREAM, 0);
830 if (sockfd < 0)
831 return 0;
832
1955fabf
MW
833 if (set_reuse_addr(sockfd)) {
834 close(sockfd);
835 return 0;
836 }
837
6573faff
PA
838 if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
839 close(sockfd);
840 return 0;
841 }
a87e8be2 842
f35230fb
PS
843 if (listen(sockfd, 5) < 0) {
844 close(sockfd);
845 return 0;
846 }
847
20276889
AJ
848 flags = fcntl(sockfd, F_GETFD, 0);
849 if (flags >= 0)
850 fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
851
2caa3215
AS
852 ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
853 socklist->list[socklist->nr++] = sockfd;
f35230fb 854 return 1;
6573faff
PA
855}
856
857#endif
858
3a3a29c1 859static void socksetup(struct string_list *listen_addr, int listen_port, struct socketlist *socklist)
2caa3215 860{
3a3a29c1
AS
861 if (!listen_addr->nr)
862 setup_named_sock(NULL, listen_port, socklist);
863 else {
864 int i, socknum;
865 for (i = 0; i < listen_addr->nr; i++) {
866 socknum = setup_named_sock(listen_addr->items[i].string,
867 listen_port, socklist);
868
869 if (socknum == 0)
870 logerror("unable to allocate any listen sockets for host %s on port %u",
871 listen_addr->items[i].string, listen_port);
872 }
873 }
2caa3215
AS
874}
875
876static int service_loop(struct socketlist *socklist)
6573faff
PA
877{
878 struct pollfd *pfd;
879 int i;
880
2caa3215 881 pfd = xcalloc(socklist->nr, sizeof(struct pollfd));
6573faff 882
2caa3215
AS
883 for (i = 0; i < socklist->nr; i++) {
884 pfd[i].fd = socklist->list[i];
6573faff
PA
885 pfd[i].events = POLLIN;
886 }
9220282a
PA
887
888 signal(SIGCHLD, child_handler);
a87e8be2
LT
889
890 for (;;) {
df076bdb 891 int i;
6573faff 892
695605b5
SB
893 check_dead_children();
894
2caa3215 895 if (poll(pfd, socklist->nr, -1) < 0) {
1eef0b33 896 if (errno != EINTR) {
df0daf8a 897 logerror("Poll failed, resuming: %s",
1eef0b33
JH
898 strerror(errno));
899 sleep(1);
900 }
df076bdb
YH
901 continue;
902 }
903
2caa3215 904 for (i = 0; i < socklist->nr; i++) {
6573faff 905 if (pfd[i].revents & POLLIN) {
f9c87be6
EFL
906 union {
907 struct sockaddr sa;
908 struct sockaddr_in sai;
909#ifndef NO_IPV6
910 struct sockaddr_in6 sai6;
911#endif
912 } ss;
c295cf06 913 socklen_t sslen = sizeof(ss);
f9c87be6 914 int incoming = accept(pfd[i].fd, &ss.sa, &sslen);
df076bdb
YH
915 if (incoming < 0) {
916 switch (errno) {
917 case EAGAIN:
918 case EINTR:
919 case ECONNABORTED:
920 continue;
921 default:
d824cbba 922 die_errno("accept returned");
df076bdb
YH
923 }
924 }
f9c87be6 925 handle(incoming, &ss.sa, sslen);
a87e8be2
LT
926 }
927 }
a87e8be2
LT
928 }
929}
930
258e93a1
ML
931/* if any standard file descriptor is missing open it to /dev/null */
932static void sanitize_stdfds(void)
933{
934 int fd = open("/dev/null", O_RDWR, 0);
935 while (fd != -1 && fd < 2)
936 fd = dup(fd);
937 if (fd == -1)
d824cbba 938 die_errno("open /dev/null or dup failed");
258e93a1
ML
939 if (fd > 2)
940 close(fd);
941}
942
a5262768
ML
943static void daemonize(void)
944{
945 switch (fork()) {
946 case 0:
947 break;
948 case -1:
d824cbba 949 die_errno("fork failed");
a5262768
ML
950 default:
951 exit(0);
952 }
953 if (setsid() == -1)
d824cbba 954 die_errno("setsid failed");
a5262768
ML
955 close(0);
956 close(1);
957 close(2);
958 sanitize_stdfds();
959}
960
45ed5d7f
ML
961static void store_pid(const char *path)
962{
963 FILE *f = fopen(path, "w");
964 if (!f)
d824cbba 965 die_errno("cannot open pid file '%s'", path);
85e72830 966 if (fprintf(f, "%"PRIuMAX"\n", (uintmax_t) getpid()) < 0 || fclose(f) != 0)
d824cbba 967 die_errno("failed to write pid file '%s'", path);
45ed5d7f
ML
968}
969
3a3a29c1 970static int serve(struct string_list *listen_addr, int listen_port, struct passwd *pass, gid_t gid)
6573faff 971{
2caa3215 972 struct socketlist socklist = { NULL, 0, 0 };
4ae22d96 973
2caa3215
AS
974 socksetup(listen_addr, listen_port, &socklist);
975 if (socklist.nr == 0)
3a3a29c1
AS
976 die("unable to allocate any listen sockets on port %u",
977 listen_port);
4ae22d96 978
678dac6b
TS
979 if (pass && gid &&
980 (initgroups(pass->pw_name, gid) || setgid (gid) ||
981 setuid(pass->pw_uid)))
982 die("cannot drop privileges");
983
2caa3215 984 return service_loop(&socklist);
4ae22d96 985}
6573faff 986
a87e8be2
LT
987int main(int argc, char **argv)
988{
dd467629 989 int listen_port = 0;
3a3a29c1 990 struct string_list listen_addr = STRING_LIST_INIT_NODUP;
30e15602 991 int serve_mode = 0, inetd_mode = 0;
678dac6b 992 const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
a5262768 993 int detach = 0;
678dac6b
TS
994 struct passwd *pass = NULL;
995 struct group *group;
996 gid_t gid = 0;
a87e8be2
LT
997 int i;
998
2fb3f6db
SP
999 git_extract_argv0_path(argv[0]);
1000
a87e8be2
LT
1001 for (i = 1; i < argc; i++) {
1002 char *arg = argv[i];
1003
cc44c765 1004 if (!prefixcmp(arg, "--listen=")) {
3a3a29c1 1005 string_list_append(&listen_addr, xstrdup_tolower(arg + 9));
6720e95b 1006 continue;
dd467629 1007 }
cc44c765 1008 if (!prefixcmp(arg, "--port=")) {
a87e8be2
LT
1009 char *end;
1010 unsigned long n;
1011 n = strtoul(arg+7, &end, 0);
1012 if (arg[7] && !*end) {
dd467629 1013 listen_port = n;
a87e8be2
LT
1014 continue;
1015 }
1016 }
30e15602
EFL
1017 if (!strcmp(arg, "--serve")) {
1018 serve_mode = 1;
1019 continue;
1020 }
e64e1b79
LT
1021 if (!strcmp(arg, "--inetd")) {
1022 inetd_mode = 1;
a8883288 1023 log_syslog = 1;
e64e1b79
LT
1024 continue;
1025 }
f8ff0c06
PB
1026 if (!strcmp(arg, "--verbose")) {
1027 verbose = 1;
1028 continue;
1029 }
9048fe1c
PB
1030 if (!strcmp(arg, "--syslog")) {
1031 log_syslog = 1;
9048fe1c
PB
1032 continue;
1033 }
4ae95682
PA
1034 if (!strcmp(arg, "--export-all")) {
1035 export_all_trees = 1;
1036 continue;
1037 }
cc44c765 1038 if (!prefixcmp(arg, "--timeout=")) {
960deccb 1039 timeout = atoi(arg+10);
a8883288 1040 continue;
960deccb 1041 }
cc44c765 1042 if (!prefixcmp(arg, "--init-timeout=")) {
960deccb 1043 init_timeout = atoi(arg+15);
a8883288 1044 continue;
960deccb 1045 }
3bd62c21
SB
1046 if (!prefixcmp(arg, "--max-connections=")) {
1047 max_connections = atoi(arg+18);
1048 if (max_connections < 0)
1049 max_connections = 0; /* unlimited */
1050 continue;
1051 }
4dbd1352
AE
1052 if (!strcmp(arg, "--strict-paths")) {
1053 strict_paths = 1;
1054 continue;
1055 }
cc44c765 1056 if (!prefixcmp(arg, "--base-path=")) {
b21c31c9
PB
1057 base_path = arg+12;
1058 continue;
1059 }
73a7a656
JA
1060 if (!strcmp(arg, "--base-path-relaxed")) {
1061 base_path_relaxed = 1;
1062 continue;
1063 }
cc44c765 1064 if (!prefixcmp(arg, "--interpolated-path=")) {
49ba83fb
JL
1065 interpolated_path = arg+20;
1066 continue;
1067 }
1955fabf
MW
1068 if (!strcmp(arg, "--reuseaddr")) {
1069 reuseaddr = 1;
1070 continue;
1071 }
603968d2
JH
1072 if (!strcmp(arg, "--user-path")) {
1073 user_path = "";
1074 continue;
1075 }
cc44c765 1076 if (!prefixcmp(arg, "--user-path=")) {
603968d2
JH
1077 user_path = arg + 12;
1078 continue;
1079 }
cc44c765 1080 if (!prefixcmp(arg, "--pid-file=")) {
45ed5d7f
ML
1081 pid_file = arg + 11;
1082 continue;
1083 }
a5262768
ML
1084 if (!strcmp(arg, "--detach")) {
1085 detach = 1;
1086 log_syslog = 1;
1087 continue;
1088 }
cc44c765 1089 if (!prefixcmp(arg, "--user=")) {
678dac6b
TS
1090 user_name = arg + 7;
1091 continue;
1092 }
cc44c765 1093 if (!prefixcmp(arg, "--group=")) {
678dac6b
TS
1094 group_name = arg + 8;
1095 continue;
1096 }
cc44c765 1097 if (!prefixcmp(arg, "--enable=")) {
d819e4e6
JH
1098 enable_service(arg + 9, 1);
1099 continue;
1100 }
cc44c765 1101 if (!prefixcmp(arg, "--disable=")) {
d819e4e6
JH
1102 enable_service(arg + 10, 0);
1103 continue;
1104 }
cc44c765 1105 if (!prefixcmp(arg, "--allow-override=")) {
74c0cc21 1106 make_service_overridable(arg + 17, 1);
d819e4e6
JH
1107 continue;
1108 }
cc44c765 1109 if (!prefixcmp(arg, "--forbid-override=")) {
74c0cc21 1110 make_service_overridable(arg + 18, 0);
d819e4e6
JH
1111 continue;
1112 }
4ae95682
PA
1113 if (!strcmp(arg, "--")) {
1114 ok_paths = &argv[i+1];
1115 break;
1116 } else if (arg[0] != '-') {
1117 ok_paths = &argv[i];
1118 break;
1119 }
e64e1b79 1120
a87e8be2
LT
1121 usage(daemon_usage);
1122 }
1123
22665bba 1124 if (log_syslog) {
6a992e9e 1125 openlog("git-daemon", LOG_PID, LOG_DAEMON);
22665bba 1126 set_die_routine(daemon_die);
460c2010 1127 } else
48196afd 1128 /* avoid splitting a message in the middle */
48cfaea1 1129 setvbuf(stderr, NULL, _IOFBF, 4096);
22665bba 1130
678dac6b
TS
1131 if (inetd_mode && (group_name || user_name))
1132 die("--user and --group are incompatible with --inetd");
1133
3a3a29c1 1134 if (inetd_mode && (listen_port || (listen_addr.nr > 0)))
dd467629
JL
1135 die("--listen= and --port= are incompatible with --inetd");
1136 else if (listen_port == 0)
1137 listen_port = DEFAULT_GIT_PORT;
1138
678dac6b
TS
1139 if (group_name && !user_name)
1140 die("--group supplied without --user");
1141
1142 if (user_name) {
1143 pass = getpwnam(user_name);
1144 if (!pass)
1145 die("user not found - %s", user_name);
1146
1147 if (!group_name)
1148 gid = pass->pw_gid;
1149 else {
1150 group = getgrnam(group_name);
1151 if (!group)
1152 die("group not found - %s", group_name);
1153
1154 gid = group->gr_gid;
1155 }
1156 }
1157
ad8b4f56
ML
1158 if (strict_paths && (!ok_paths || !*ok_paths))
1159 die("option --strict-paths requires a whitelist");
1160
90b4a71c
JH
1161 if (base_path && !is_directory(base_path))
1162 die("base-path '%s' does not exist or is not a directory",
1163 base_path);
20632071 1164
7c3693f1 1165 if (inetd_mode) {
30e15602
EFL
1166 if (!freopen("/dev/null", "w", stderr))
1167 die_errno("failed to redirect stderr to /dev/null");
1168 }
1169
f9c87be6
EFL
1170 if (inetd_mode || serve_mode)
1171 return execute();
bce8230d 1172
6a992e9e 1173 if (detach) {
a5262768 1174 daemonize();
6a992e9e
SB
1175 loginfo("Ready to rumble");
1176 }
a5262768
ML
1177 else
1178 sanitize_stdfds();
258e93a1 1179
45ed5d7f
ML
1180 if (pid_file)
1181 store_pid(pid_file);
1182
30e15602
EFL
1183 /* prepare argv for serving-processes */
1184 cld_argv = xmalloc(sizeof (char *) * (argc + 2));
1185 for (i = 0; i < argc; ++i)
1186 cld_argv[i] = argv[i];
1187 cld_argv[argc] = "--serve";
1188 cld_argv[argc+1] = NULL;
1189
3a3a29c1 1190 return serve(&listen_addr, listen_port, pass, gid);
a87e8be2 1191}