Merge branch 'jk/tag-sort'
[git.git] / http-backend.c
blob80790bbaef95a56ac737c7763e48035e3e0754ee
1 #include "cache.h"
2 #include "refs.h"
3 #include "pkt-line.h"
4 #include "object.h"
5 #include "tag.h"
6 #include "exec_cmd.h"
7 #include "run-command.h"
8 #include "string-list.h"
9 #include "url.h"
10 #include "argv-array.h"
12 static const char content_type[] = "Content-Type";
13 static const char content_length[] = "Content-Length";
14 static const char last_modified[] = "Last-Modified";
15 static int getanyfile = 1;
17 static struct string_list *query_params;
19 struct rpc_service {
20 const char *name;
21 const char *config_name;
22 signed enabled : 2;
25 static struct rpc_service rpc_service[] = {
26 { "upload-pack", "uploadpack", 1 },
27 { "receive-pack", "receivepack", -1 },
30 static struct string_list *get_parameters(void)
32 if (!query_params) {
33 const char *query = getenv("QUERY_STRING");
35 query_params = xcalloc(1, sizeof(*query_params));
36 while (query && *query) {
37 char *name = url_decode_parameter_name(&query);
38 char *value = url_decode_parameter_value(&query);
39 struct string_list_item *i;
41 i = string_list_lookup(query_params, name);
42 if (!i)
43 i = string_list_insert(query_params, name);
44 else
45 free(i->util);
46 i->util = value;
49 return query_params;
52 static const char *get_parameter(const char *name)
54 struct string_list_item *i;
55 i = string_list_lookup(get_parameters(), name);
56 return i ? i->util : NULL;
59 __attribute__((format (printf, 2, 3)))
60 static void format_write(int fd, const char *fmt, ...)
62 static char buffer[1024];
64 va_list args;
65 unsigned n;
67 va_start(args, fmt);
68 n = vsnprintf(buffer, sizeof(buffer), fmt, args);
69 va_end(args);
70 if (n >= sizeof(buffer))
71 die("protocol error: impossibly long line");
73 write_or_die(fd, buffer, n);
76 static void http_status(unsigned code, const char *msg)
78 format_write(1, "Status: %u %s\r\n", code, msg);
81 static void hdr_str(const char *name, const char *value)
83 format_write(1, "%s: %s\r\n", name, value);
86 static void hdr_int(const char *name, uintmax_t value)
88 format_write(1, "%s: %" PRIuMAX "\r\n", name, value);
91 static void hdr_date(const char *name, unsigned long when)
93 const char *value = show_date(when, 0, DATE_RFC2822);
94 hdr_str(name, value);
97 static void hdr_nocache(void)
99 hdr_str("Expires", "Fri, 01 Jan 1980 00:00:00 GMT");
100 hdr_str("Pragma", "no-cache");
101 hdr_str("Cache-Control", "no-cache, max-age=0, must-revalidate");
104 static void hdr_cache_forever(void)
106 unsigned long now = time(NULL);
107 hdr_date("Date", now);
108 hdr_date("Expires", now + 31536000);
109 hdr_str("Cache-Control", "public, max-age=31536000");
112 static void end_headers(void)
114 write_or_die(1, "\r\n", 2);
117 __attribute__((format (printf, 1, 2)))
118 static NORETURN void not_found(const char *err, ...)
120 va_list params;
122 http_status(404, "Not Found");
123 hdr_nocache();
124 end_headers();
126 va_start(params, err);
127 if (err && *err)
128 vfprintf(stderr, err, params);
129 va_end(params);
130 exit(0);
133 __attribute__((format (printf, 1, 2)))
134 static NORETURN void forbidden(const char *err, ...)
136 va_list params;
138 http_status(403, "Forbidden");
139 hdr_nocache();
140 end_headers();
142 va_start(params, err);
143 if (err && *err)
144 vfprintf(stderr, err, params);
145 va_end(params);
146 exit(0);
149 static void select_getanyfile(void)
151 if (!getanyfile)
152 forbidden("Unsupported service: getanyfile");
155 static void send_strbuf(const char *type, struct strbuf *buf)
157 hdr_int(content_length, buf->len);
158 hdr_str(content_type, type);
159 end_headers();
160 write_or_die(1, buf->buf, buf->len);
163 static void send_local_file(const char *the_type, const char *name)
165 const char *p = git_path("%s", name);
166 size_t buf_alloc = 8192;
167 char *buf = xmalloc(buf_alloc);
168 int fd;
169 struct stat sb;
171 fd = open(p, O_RDONLY);
172 if (fd < 0)
173 not_found("Cannot open '%s': %s", p, strerror(errno));
174 if (fstat(fd, &sb) < 0)
175 die_errno("Cannot stat '%s'", p);
177 hdr_int(content_length, sb.st_size);
178 hdr_str(content_type, the_type);
179 hdr_date(last_modified, sb.st_mtime);
180 end_headers();
182 for (;;) {
183 ssize_t n = xread(fd, buf, buf_alloc);
184 if (n < 0)
185 die_errno("Cannot read '%s'", p);
186 if (!n)
187 break;
188 write_or_die(1, buf, n);
190 close(fd);
191 free(buf);
194 static void get_text_file(char *name)
196 select_getanyfile();
197 hdr_nocache();
198 send_local_file("text/plain", name);
201 static void get_loose_object(char *name)
203 select_getanyfile();
204 hdr_cache_forever();
205 send_local_file("application/x-git-loose-object", name);
208 static void get_pack_file(char *name)
210 select_getanyfile();
211 hdr_cache_forever();
212 send_local_file("application/x-git-packed-objects", name);
215 static void get_idx_file(char *name)
217 select_getanyfile();
218 hdr_cache_forever();
219 send_local_file("application/x-git-packed-objects-toc", name);
222 static int http_config(const char *var, const char *value, void *cb)
224 const char *p;
226 if (!strcmp(var, "http.getanyfile")) {
227 getanyfile = git_config_bool(var, value);
228 return 0;
231 if (skip_prefix(var, "http.", &p)) {
232 int i;
234 for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
235 struct rpc_service *svc = &rpc_service[i];
236 if (!strcmp(p, svc->config_name)) {
237 svc->enabled = git_config_bool(var, value);
238 return 0;
243 /* we are not interested in parsing any other configuration here */
244 return 0;
247 static struct rpc_service *select_service(const char *name)
249 const char *svc_name;
250 struct rpc_service *svc = NULL;
251 int i;
253 if (!skip_prefix(name, "git-", &svc_name))
254 forbidden("Unsupported service: '%s'", name);
256 for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
257 struct rpc_service *s = &rpc_service[i];
258 if (!strcmp(s->name, svc_name)) {
259 svc = s;
260 break;
264 if (!svc)
265 forbidden("Unsupported service: '%s'", name);
267 if (svc->enabled < 0) {
268 const char *user = getenv("REMOTE_USER");
269 svc->enabled = (user && *user) ? 1 : 0;
271 if (!svc->enabled)
272 forbidden("Service not enabled: '%s'", svc->name);
273 return svc;
276 static void inflate_request(const char *prog_name, int out)
278 git_zstream stream;
279 unsigned char in_buf[8192];
280 unsigned char out_buf[8192];
281 unsigned long cnt = 0;
283 memset(&stream, 0, sizeof(stream));
284 git_inflate_init_gzip_only(&stream);
286 while (1) {
287 ssize_t n = xread(0, in_buf, sizeof(in_buf));
288 if (n <= 0)
289 die("request ended in the middle of the gzip stream");
291 stream.next_in = in_buf;
292 stream.avail_in = n;
294 while (0 < stream.avail_in) {
295 int ret;
297 stream.next_out = out_buf;
298 stream.avail_out = sizeof(out_buf);
300 ret = git_inflate(&stream, Z_NO_FLUSH);
301 if (ret != Z_OK && ret != Z_STREAM_END)
302 die("zlib error inflating request, result %d", ret);
304 n = stream.total_out - cnt;
305 if (write_in_full(out, out_buf, n) != n)
306 die("%s aborted reading request", prog_name);
307 cnt += n;
309 if (ret == Z_STREAM_END)
310 goto done;
314 done:
315 git_inflate_end(&stream);
316 close(out);
319 static void run_service(const char **argv)
321 const char *encoding = getenv("HTTP_CONTENT_ENCODING");
322 const char *user = getenv("REMOTE_USER");
323 const char *host = getenv("REMOTE_ADDR");
324 struct argv_array env = ARGV_ARRAY_INIT;
325 int gzipped_request = 0;
326 struct child_process cld;
328 if (encoding && !strcmp(encoding, "gzip"))
329 gzipped_request = 1;
330 else if (encoding && !strcmp(encoding, "x-gzip"))
331 gzipped_request = 1;
333 if (!user || !*user)
334 user = "anonymous";
335 if (!host || !*host)
336 host = "(none)";
338 if (!getenv("GIT_COMMITTER_NAME"))
339 argv_array_pushf(&env, "GIT_COMMITTER_NAME=%s", user);
340 if (!getenv("GIT_COMMITTER_EMAIL"))
341 argv_array_pushf(&env, "GIT_COMMITTER_EMAIL=%s@http.%s",
342 user, host);
344 memset(&cld, 0, sizeof(cld));
345 cld.argv = argv;
346 cld.env = env.argv;
347 if (gzipped_request)
348 cld.in = -1;
349 cld.git_cmd = 1;
350 if (start_command(&cld))
351 exit(1);
353 close(1);
354 if (gzipped_request)
355 inflate_request(argv[0], cld.in);
356 else
357 close(0);
359 if (finish_command(&cld))
360 exit(1);
361 argv_array_clear(&env);
364 static int show_text_ref(const char *name, const unsigned char *sha1,
365 int flag, void *cb_data)
367 const char *name_nons = strip_namespace(name);
368 struct strbuf *buf = cb_data;
369 struct object *o = parse_object(sha1);
370 if (!o)
371 return 0;
373 strbuf_addf(buf, "%s\t%s\n", sha1_to_hex(sha1), name_nons);
374 if (o->type == OBJ_TAG) {
375 o = deref_tag(o, name, 0);
376 if (!o)
377 return 0;
378 strbuf_addf(buf, "%s\t%s^{}\n", sha1_to_hex(o->sha1),
379 name_nons);
381 return 0;
384 static void get_info_refs(char *arg)
386 const char *service_name = get_parameter("service");
387 struct strbuf buf = STRBUF_INIT;
389 hdr_nocache();
391 if (service_name) {
392 const char *argv[] = {NULL /* service name */,
393 "--stateless-rpc", "--advertise-refs",
394 ".", NULL};
395 struct rpc_service *svc = select_service(service_name);
397 strbuf_addf(&buf, "application/x-git-%s-advertisement",
398 svc->name);
399 hdr_str(content_type, buf.buf);
400 end_headers();
402 packet_write(1, "# service=git-%s\n", svc->name);
403 packet_flush(1);
405 argv[0] = svc->name;
406 run_service(argv);
408 } else {
409 select_getanyfile();
410 for_each_namespaced_ref(show_text_ref, &buf);
411 send_strbuf("text/plain", &buf);
413 strbuf_release(&buf);
416 static int show_head_ref(const char *refname, const unsigned char *sha1,
417 int flag, void *cb_data)
419 struct strbuf *buf = cb_data;
421 if (flag & REF_ISSYMREF) {
422 unsigned char unused[20];
423 const char *target = resolve_ref_unsafe(refname, unused, 1, NULL);
424 const char *target_nons = strip_namespace(target);
426 strbuf_addf(buf, "ref: %s\n", target_nons);
427 } else {
428 strbuf_addf(buf, "%s\n", sha1_to_hex(sha1));
431 return 0;
434 static void get_head(char *arg)
436 struct strbuf buf = STRBUF_INIT;
438 select_getanyfile();
439 head_ref_namespaced(show_head_ref, &buf);
440 send_strbuf("text/plain", &buf);
441 strbuf_release(&buf);
444 static void get_info_packs(char *arg)
446 size_t objdirlen = strlen(get_object_directory());
447 struct strbuf buf = STRBUF_INIT;
448 struct packed_git *p;
449 size_t cnt = 0;
451 select_getanyfile();
452 prepare_packed_git();
453 for (p = packed_git; p; p = p->next) {
454 if (p->pack_local)
455 cnt++;
458 strbuf_grow(&buf, cnt * 53 + 2);
459 for (p = packed_git; p; p = p->next) {
460 if (p->pack_local)
461 strbuf_addf(&buf, "P %s\n", p->pack_name + objdirlen + 6);
463 strbuf_addch(&buf, '\n');
465 hdr_nocache();
466 send_strbuf("text/plain; charset=utf-8", &buf);
467 strbuf_release(&buf);
470 static void check_content_type(const char *accepted_type)
472 const char *actual_type = getenv("CONTENT_TYPE");
474 if (!actual_type)
475 actual_type = "";
477 if (strcmp(actual_type, accepted_type)) {
478 http_status(415, "Unsupported Media Type");
479 hdr_nocache();
480 end_headers();
481 format_write(1,
482 "Expected POST with Content-Type '%s',"
483 " but received '%s' instead.\n",
484 accepted_type, actual_type);
485 exit(0);
489 static void service_rpc(char *service_name)
491 const char *argv[] = {NULL, "--stateless-rpc", ".", NULL};
492 struct rpc_service *svc = select_service(service_name);
493 struct strbuf buf = STRBUF_INIT;
495 strbuf_reset(&buf);
496 strbuf_addf(&buf, "application/x-git-%s-request", svc->name);
497 check_content_type(buf.buf);
499 hdr_nocache();
501 strbuf_reset(&buf);
502 strbuf_addf(&buf, "application/x-git-%s-result", svc->name);
503 hdr_str(content_type, buf.buf);
505 end_headers();
507 argv[0] = svc->name;
508 run_service(argv);
509 strbuf_release(&buf);
512 static NORETURN void die_webcgi(const char *err, va_list params)
514 static int dead;
516 if (!dead) {
517 dead = 1;
518 http_status(500, "Internal Server Error");
519 hdr_nocache();
520 end_headers();
522 vreportf("fatal: ", err, params);
524 exit(0); /* we successfully reported a failure ;-) */
527 static char* getdir(void)
529 struct strbuf buf = STRBUF_INIT;
530 char *pathinfo = getenv("PATH_INFO");
531 char *root = getenv("GIT_PROJECT_ROOT");
532 char *path = getenv("PATH_TRANSLATED");
534 if (root && *root) {
535 if (!pathinfo || !*pathinfo)
536 die("GIT_PROJECT_ROOT is set but PATH_INFO is not");
537 if (daemon_avoid_alias(pathinfo))
538 die("'%s': aliased", pathinfo);
539 end_url_with_slash(&buf, root);
540 if (pathinfo[0] == '/')
541 pathinfo++;
542 strbuf_addstr(&buf, pathinfo);
543 return strbuf_detach(&buf, NULL);
544 } else if (path && *path) {
545 return xstrdup(path);
546 } else
547 die("No GIT_PROJECT_ROOT or PATH_TRANSLATED from server");
548 return NULL;
551 static struct service_cmd {
552 const char *method;
553 const char *pattern;
554 void (*imp)(char *);
555 } services[] = {
556 {"GET", "/HEAD$", get_head},
557 {"GET", "/info/refs$", get_info_refs},
558 {"GET", "/objects/info/alternates$", get_text_file},
559 {"GET", "/objects/info/http-alternates$", get_text_file},
560 {"GET", "/objects/info/packs$", get_info_packs},
561 {"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{38}$", get_loose_object},
562 {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.pack$", get_pack_file},
563 {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.idx$", get_idx_file},
565 {"POST", "/git-upload-pack$", service_rpc},
566 {"POST", "/git-receive-pack$", service_rpc}
569 int main(int argc, char **argv)
571 char *method = getenv("REQUEST_METHOD");
572 char *dir;
573 struct service_cmd *cmd = NULL;
574 char *cmd_arg = NULL;
575 int i;
577 git_setup_gettext();
579 git_extract_argv0_path(argv[0]);
580 set_die_routine(die_webcgi);
582 if (!method)
583 die("No REQUEST_METHOD from server");
584 if (!strcmp(method, "HEAD"))
585 method = "GET";
586 dir = getdir();
588 for (i = 0; i < ARRAY_SIZE(services); i++) {
589 struct service_cmd *c = &services[i];
590 regex_t re;
591 regmatch_t out[1];
593 if (regcomp(&re, c->pattern, REG_EXTENDED))
594 die("Bogus regex in service table: %s", c->pattern);
595 if (!regexec(&re, dir, 1, out, 0)) {
596 size_t n;
598 if (strcmp(method, c->method)) {
599 const char *proto = getenv("SERVER_PROTOCOL");
600 if (proto && !strcmp(proto, "HTTP/1.1")) {
601 http_status(405, "Method Not Allowed");
602 hdr_str("Allow", !strcmp(c->method, "GET") ?
603 "GET, HEAD" : c->method);
604 } else
605 http_status(400, "Bad Request");
606 hdr_nocache();
607 end_headers();
608 return 0;
611 cmd = c;
612 n = out[0].rm_eo - out[0].rm_so;
613 cmd_arg = xmemdupz(dir + out[0].rm_so + 1, n - 1);
614 dir[out[0].rm_so] = 0;
615 break;
617 regfree(&re);
620 if (!cmd)
621 not_found("Request not supported: '%s'", dir);
623 setup_path();
624 if (!enter_repo(dir, 0))
625 not_found("Not a git repository: '%s'", dir);
626 if (!getenv("GIT_HTTP_EXPORT_ALL") &&
627 access("git-daemon-export-ok", F_OK) )
628 not_found("Repository not exported: '%s'", dir);
630 git_config(http_config, NULL);
631 cmd->imp(cmd_arg);
632 return 0;