object-store: move packed_git and packed_git_mru to object store
[git/git.git] / http-backend.c
1 #include "cache.h"
2 #include "config.h"
3 #include "repository.h"
4 #include "refs.h"
5 #include "pkt-line.h"
6 #include "object.h"
7 #include "tag.h"
8 #include "exec_cmd.h"
9 #include "run-command.h"
10 #include "string-list.h"
11 #include "url.h"
12 #include "argv-array.h"
13 #include "packfile.h"
14 #include "object-store.h"
15
16 static const char content_type[] = "Content-Type";
17 static const char content_length[] = "Content-Length";
18 static const char last_modified[] = "Last-Modified";
19 static int getanyfile = 1;
20 static unsigned long max_request_buffer = 10 * 1024 * 1024;
21
22 static struct string_list *query_params;
23
24 struct rpc_service {
25 const char *name;
26 const char *config_name;
27 unsigned buffer_input : 1;
28 signed enabled : 2;
29 };
30
31 static struct rpc_service rpc_service[] = {
32 { "upload-pack", "uploadpack", 1, 1 },
33 { "receive-pack", "receivepack", 0, -1 },
34 };
35
36 static struct string_list *get_parameters(void)
37 {
38 if (!query_params) {
39 const char *query = getenv("QUERY_STRING");
40
41 query_params = xcalloc(1, sizeof(*query_params));
42 while (query && *query) {
43 char *name = url_decode_parameter_name(&query);
44 char *value = url_decode_parameter_value(&query);
45 struct string_list_item *i;
46
47 i = string_list_lookup(query_params, name);
48 if (!i)
49 i = string_list_insert(query_params, name);
50 else
51 free(i->util);
52 i->util = value;
53 }
54 }
55 return query_params;
56 }
57
58 static const char *get_parameter(const char *name)
59 {
60 struct string_list_item *i;
61 i = string_list_lookup(get_parameters(), name);
62 return i ? i->util : NULL;
63 }
64
65 __attribute__((format (printf, 2, 3)))
66 static void format_write(int fd, const char *fmt, ...)
67 {
68 static char buffer[1024];
69
70 va_list args;
71 unsigned n;
72
73 va_start(args, fmt);
74 n = vsnprintf(buffer, sizeof(buffer), fmt, args);
75 va_end(args);
76 if (n >= sizeof(buffer))
77 die("protocol error: impossibly long line");
78
79 write_or_die(fd, buffer, n);
80 }
81
82 static void http_status(struct strbuf *hdr, unsigned code, const char *msg)
83 {
84 strbuf_addf(hdr, "Status: %u %s\r\n", code, msg);
85 }
86
87 static void hdr_str(struct strbuf *hdr, const char *name, const char *value)
88 {
89 strbuf_addf(hdr, "%s: %s\r\n", name, value);
90 }
91
92 static void hdr_int(struct strbuf *hdr, const char *name, uintmax_t value)
93 {
94 strbuf_addf(hdr, "%s: %" PRIuMAX "\r\n", name, value);
95 }
96
97 static void hdr_date(struct strbuf *hdr, const char *name, timestamp_t when)
98 {
99 const char *value = show_date(when, 0, DATE_MODE(RFC2822));
100 hdr_str(hdr, name, value);
101 }
102
103 static void hdr_nocache(struct strbuf *hdr)
104 {
105 hdr_str(hdr, "Expires", "Fri, 01 Jan 1980 00:00:00 GMT");
106 hdr_str(hdr, "Pragma", "no-cache");
107 hdr_str(hdr, "Cache-Control", "no-cache, max-age=0, must-revalidate");
108 }
109
110 static void hdr_cache_forever(struct strbuf *hdr)
111 {
112 timestamp_t now = time(NULL);
113 hdr_date(hdr, "Date", now);
114 hdr_date(hdr, "Expires", now + 31536000);
115 hdr_str(hdr, "Cache-Control", "public, max-age=31536000");
116 }
117
118 static void end_headers(struct strbuf *hdr)
119 {
120 strbuf_add(hdr, "\r\n", 2);
121 write_or_die(1, hdr->buf, hdr->len);
122 strbuf_release(hdr);
123 }
124
125 __attribute__((format (printf, 2, 3)))
126 static NORETURN void not_found(struct strbuf *hdr, const char *err, ...)
127 {
128 va_list params;
129
130 http_status(hdr, 404, "Not Found");
131 hdr_nocache(hdr);
132 end_headers(hdr);
133
134 va_start(params, err);
135 if (err && *err)
136 vfprintf(stderr, err, params);
137 va_end(params);
138 exit(0);
139 }
140
141 __attribute__((format (printf, 2, 3)))
142 static NORETURN void forbidden(struct strbuf *hdr, const char *err, ...)
143 {
144 va_list params;
145
146 http_status(hdr, 403, "Forbidden");
147 hdr_nocache(hdr);
148 end_headers(hdr);
149
150 va_start(params, err);
151 if (err && *err)
152 vfprintf(stderr, err, params);
153 va_end(params);
154 exit(0);
155 }
156
157 static void select_getanyfile(struct strbuf *hdr)
158 {
159 if (!getanyfile)
160 forbidden(hdr, "Unsupported service: getanyfile");
161 }
162
163 static void send_strbuf(struct strbuf *hdr,
164 const char *type, struct strbuf *buf)
165 {
166 hdr_int(hdr, content_length, buf->len);
167 hdr_str(hdr, content_type, type);
168 end_headers(hdr);
169 write_or_die(1, buf->buf, buf->len);
170 }
171
172 static void send_local_file(struct strbuf *hdr, const char *the_type,
173 const char *name)
174 {
175 char *p = git_pathdup("%s", name);
176 size_t buf_alloc = 8192;
177 char *buf = xmalloc(buf_alloc);
178 int fd;
179 struct stat sb;
180
181 fd = open(p, O_RDONLY);
182 if (fd < 0)
183 not_found(hdr, "Cannot open '%s': %s", p, strerror(errno));
184 if (fstat(fd, &sb) < 0)
185 die_errno("Cannot stat '%s'", p);
186
187 hdr_int(hdr, content_length, sb.st_size);
188 hdr_str(hdr, content_type, the_type);
189 hdr_date(hdr, last_modified, sb.st_mtime);
190 end_headers(hdr);
191
192 for (;;) {
193 ssize_t n = xread(fd, buf, buf_alloc);
194 if (n < 0)
195 die_errno("Cannot read '%s'", p);
196 if (!n)
197 break;
198 write_or_die(1, buf, n);
199 }
200 close(fd);
201 free(buf);
202 free(p);
203 }
204
205 static void get_text_file(struct strbuf *hdr, char *name)
206 {
207 select_getanyfile(hdr);
208 hdr_nocache(hdr);
209 send_local_file(hdr, "text/plain", name);
210 }
211
212 static void get_loose_object(struct strbuf *hdr, char *name)
213 {
214 select_getanyfile(hdr);
215 hdr_cache_forever(hdr);
216 send_local_file(hdr, "application/x-git-loose-object", name);
217 }
218
219 static void get_pack_file(struct strbuf *hdr, char *name)
220 {
221 select_getanyfile(hdr);
222 hdr_cache_forever(hdr);
223 send_local_file(hdr, "application/x-git-packed-objects", name);
224 }
225
226 static void get_idx_file(struct strbuf *hdr, char *name)
227 {
228 select_getanyfile(hdr);
229 hdr_cache_forever(hdr);
230 send_local_file(hdr, "application/x-git-packed-objects-toc", name);
231 }
232
233 static void http_config(void)
234 {
235 int i, value = 0;
236 struct strbuf var = STRBUF_INIT;
237
238 git_config_get_bool("http.getanyfile", &getanyfile);
239 git_config_get_ulong("http.maxrequestbuffer", &max_request_buffer);
240
241 for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
242 struct rpc_service *svc = &rpc_service[i];
243 strbuf_addf(&var, "http.%s", svc->config_name);
244 if (!git_config_get_bool(var.buf, &value))
245 svc->enabled = value;
246 strbuf_reset(&var);
247 }
248
249 strbuf_release(&var);
250 }
251
252 static struct rpc_service *select_service(struct strbuf *hdr, const char *name)
253 {
254 const char *svc_name;
255 struct rpc_service *svc = NULL;
256 int i;
257
258 if (!skip_prefix(name, "git-", &svc_name))
259 forbidden(hdr, "Unsupported service: '%s'", name);
260
261 for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
262 struct rpc_service *s = &rpc_service[i];
263 if (!strcmp(s->name, svc_name)) {
264 svc = s;
265 break;
266 }
267 }
268
269 if (!svc)
270 forbidden(hdr, "Unsupported service: '%s'", name);
271
272 if (svc->enabled < 0) {
273 const char *user = getenv("REMOTE_USER");
274 svc->enabled = (user && *user) ? 1 : 0;
275 }
276 if (!svc->enabled)
277 forbidden(hdr, "Service not enabled: '%s'", svc->name);
278 return svc;
279 }
280
281 /*
282 * This is basically strbuf_read(), except that if we
283 * hit max_request_buffer we die (we'd rather reject a
284 * maliciously large request than chew up infinite memory).
285 */
286 static ssize_t read_request(int fd, unsigned char **out)
287 {
288 size_t len = 0, alloc = 8192;
289 unsigned char *buf = xmalloc(alloc);
290
291 if (max_request_buffer < alloc)
292 max_request_buffer = alloc;
293
294 while (1) {
295 ssize_t cnt;
296
297 cnt = read_in_full(fd, buf + len, alloc - len);
298 if (cnt < 0) {
299 free(buf);
300 return -1;
301 }
302
303 /* partial read from read_in_full means we hit EOF */
304 len += cnt;
305 if (len < alloc) {
306 *out = buf;
307 return len;
308 }
309
310 /* otherwise, grow and try again (if we can) */
311 if (alloc == max_request_buffer)
312 die("request was larger than our maximum size (%lu);"
313 " try setting GIT_HTTP_MAX_REQUEST_BUFFER",
314 max_request_buffer);
315
316 alloc = alloc_nr(alloc);
317 if (alloc > max_request_buffer)
318 alloc = max_request_buffer;
319 REALLOC_ARRAY(buf, alloc);
320 }
321 }
322
323 static void inflate_request(const char *prog_name, int out, int buffer_input)
324 {
325 git_zstream stream;
326 unsigned char *full_request = NULL;
327 unsigned char in_buf[8192];
328 unsigned char out_buf[8192];
329 unsigned long cnt = 0;
330
331 memset(&stream, 0, sizeof(stream));
332 git_inflate_init_gzip_only(&stream);
333
334 while (1) {
335 ssize_t n;
336
337 if (buffer_input) {
338 if (full_request)
339 n = 0; /* nothing left to read */
340 else
341 n = read_request(0, &full_request);
342 stream.next_in = full_request;
343 } else {
344 n = xread(0, in_buf, sizeof(in_buf));
345 stream.next_in = in_buf;
346 }
347
348 if (n <= 0)
349 die("request ended in the middle of the gzip stream");
350 stream.avail_in = n;
351
352 while (0 < stream.avail_in) {
353 int ret;
354
355 stream.next_out = out_buf;
356 stream.avail_out = sizeof(out_buf);
357
358 ret = git_inflate(&stream, Z_NO_FLUSH);
359 if (ret != Z_OK && ret != Z_STREAM_END)
360 die("zlib error inflating request, result %d", ret);
361
362 n = stream.total_out - cnt;
363 if (write_in_full(out, out_buf, n) < 0)
364 die("%s aborted reading request", prog_name);
365 cnt += n;
366
367 if (ret == Z_STREAM_END)
368 goto done;
369 }
370 }
371
372 done:
373 git_inflate_end(&stream);
374 close(out);
375 free(full_request);
376 }
377
378 static void copy_request(const char *prog_name, int out)
379 {
380 unsigned char *buf;
381 ssize_t n = read_request(0, &buf);
382 if (n < 0)
383 die_errno("error reading request body");
384 if (write_in_full(out, buf, n) < 0)
385 die("%s aborted reading request", prog_name);
386 close(out);
387 free(buf);
388 }
389
390 static void run_service(const char **argv, int buffer_input)
391 {
392 const char *encoding = getenv("HTTP_CONTENT_ENCODING");
393 const char *user = getenv("REMOTE_USER");
394 const char *host = getenv("REMOTE_ADDR");
395 int gzipped_request = 0;
396 struct child_process cld = CHILD_PROCESS_INIT;
397
398 if (encoding && !strcmp(encoding, "gzip"))
399 gzipped_request = 1;
400 else if (encoding && !strcmp(encoding, "x-gzip"))
401 gzipped_request = 1;
402
403 if (!user || !*user)
404 user = "anonymous";
405 if (!host || !*host)
406 host = "(none)";
407
408 if (!getenv("GIT_COMMITTER_NAME"))
409 argv_array_pushf(&cld.env_array, "GIT_COMMITTER_NAME=%s", user);
410 if (!getenv("GIT_COMMITTER_EMAIL"))
411 argv_array_pushf(&cld.env_array,
412 "GIT_COMMITTER_EMAIL=%s@http.%s", user, host);
413
414 cld.argv = argv;
415 if (buffer_input || gzipped_request)
416 cld.in = -1;
417 cld.git_cmd = 1;
418 if (start_command(&cld))
419 exit(1);
420
421 close(1);
422 if (gzipped_request)
423 inflate_request(argv[0], cld.in, buffer_input);
424 else if (buffer_input)
425 copy_request(argv[0], cld.in);
426 else
427 close(0);
428
429 if (finish_command(&cld))
430 exit(1);
431 }
432
433 static int show_text_ref(const char *name, const struct object_id *oid,
434 int flag, void *cb_data)
435 {
436 const char *name_nons = strip_namespace(name);
437 struct strbuf *buf = cb_data;
438 struct object *o = parse_object(oid);
439 if (!o)
440 return 0;
441
442 strbuf_addf(buf, "%s\t%s\n", oid_to_hex(oid), name_nons);
443 if (o->type == OBJ_TAG) {
444 o = deref_tag(o, name, 0);
445 if (!o)
446 return 0;
447 strbuf_addf(buf, "%s\t%s^{}\n", oid_to_hex(&o->oid),
448 name_nons);
449 }
450 return 0;
451 }
452
453 static void get_info_refs(struct strbuf *hdr, char *arg)
454 {
455 const char *service_name = get_parameter("service");
456 struct strbuf buf = STRBUF_INIT;
457
458 hdr_nocache(hdr);
459
460 if (service_name) {
461 const char *argv[] = {NULL /* service name */,
462 "--stateless-rpc", "--advertise-refs",
463 ".", NULL};
464 struct rpc_service *svc = select_service(hdr, service_name);
465
466 strbuf_addf(&buf, "application/x-git-%s-advertisement",
467 svc->name);
468 hdr_str(hdr, content_type, buf.buf);
469 end_headers(hdr);
470
471 packet_write_fmt(1, "# service=git-%s\n", svc->name);
472 packet_flush(1);
473
474 argv[0] = svc->name;
475 run_service(argv, 0);
476
477 } else {
478 select_getanyfile(hdr);
479 for_each_namespaced_ref(show_text_ref, &buf);
480 send_strbuf(hdr, "text/plain", &buf);
481 }
482 strbuf_release(&buf);
483 }
484
485 static int show_head_ref(const char *refname, const struct object_id *oid,
486 int flag, void *cb_data)
487 {
488 struct strbuf *buf = cb_data;
489
490 if (flag & REF_ISSYMREF) {
491 const char *target = resolve_ref_unsafe(refname,
492 RESOLVE_REF_READING,
493 NULL, NULL);
494
495 if (target)
496 strbuf_addf(buf, "ref: %s\n", strip_namespace(target));
497 } else {
498 strbuf_addf(buf, "%s\n", oid_to_hex(oid));
499 }
500
501 return 0;
502 }
503
504 static void get_head(struct strbuf *hdr, char *arg)
505 {
506 struct strbuf buf = STRBUF_INIT;
507
508 select_getanyfile(hdr);
509 head_ref_namespaced(show_head_ref, &buf);
510 send_strbuf(hdr, "text/plain", &buf);
511 strbuf_release(&buf);
512 }
513
514 static void get_info_packs(struct strbuf *hdr, char *arg)
515 {
516 size_t objdirlen = strlen(get_object_directory());
517 struct strbuf buf = STRBUF_INIT;
518 struct packed_git *p;
519 size_t cnt = 0;
520
521 select_getanyfile(hdr);
522 prepare_packed_git();
523 for (p = get_packed_git(the_repository); p; p = p->next) {
524 if (p->pack_local)
525 cnt++;
526 }
527
528 strbuf_grow(&buf, cnt * 53 + 2);
529 for (p = get_packed_git(the_repository); p; p = p->next) {
530 if (p->pack_local)
531 strbuf_addf(&buf, "P %s\n", p->pack_name + objdirlen + 6);
532 }
533 strbuf_addch(&buf, '\n');
534
535 hdr_nocache(hdr);
536 send_strbuf(hdr, "text/plain; charset=utf-8", &buf);
537 strbuf_release(&buf);
538 }
539
540 static void check_content_type(struct strbuf *hdr, const char *accepted_type)
541 {
542 const char *actual_type = getenv("CONTENT_TYPE");
543
544 if (!actual_type)
545 actual_type = "";
546
547 if (strcmp(actual_type, accepted_type)) {
548 http_status(hdr, 415, "Unsupported Media Type");
549 hdr_nocache(hdr);
550 end_headers(hdr);
551 format_write(1,
552 "Expected POST with Content-Type '%s',"
553 " but received '%s' instead.\n",
554 accepted_type, actual_type);
555 exit(0);
556 }
557 }
558
559 static void service_rpc(struct strbuf *hdr, char *service_name)
560 {
561 const char *argv[] = {NULL, "--stateless-rpc", ".", NULL};
562 struct rpc_service *svc = select_service(hdr, service_name);
563 struct strbuf buf = STRBUF_INIT;
564
565 strbuf_reset(&buf);
566 strbuf_addf(&buf, "application/x-git-%s-request", svc->name);
567 check_content_type(hdr, buf.buf);
568
569 hdr_nocache(hdr);
570
571 strbuf_reset(&buf);
572 strbuf_addf(&buf, "application/x-git-%s-result", svc->name);
573 hdr_str(hdr, content_type, buf.buf);
574
575 end_headers(hdr);
576
577 argv[0] = svc->name;
578 run_service(argv, svc->buffer_input);
579 strbuf_release(&buf);
580 }
581
582 static int dead;
583 static NORETURN void die_webcgi(const char *err, va_list params)
584 {
585 if (dead <= 1) {
586 struct strbuf hdr = STRBUF_INIT;
587
588 vreportf("fatal: ", err, params);
589
590 http_status(&hdr, 500, "Internal Server Error");
591 hdr_nocache(&hdr);
592 end_headers(&hdr);
593 }
594 exit(0); /* we successfully reported a failure ;-) */
595 }
596
597 static int die_webcgi_recursing(void)
598 {
599 return dead++ > 1;
600 }
601
602 static char* getdir(void)
603 {
604 struct strbuf buf = STRBUF_INIT;
605 char *pathinfo = getenv("PATH_INFO");
606 char *root = getenv("GIT_PROJECT_ROOT");
607 char *path = getenv("PATH_TRANSLATED");
608
609 if (root && *root) {
610 if (!pathinfo || !*pathinfo)
611 die("GIT_PROJECT_ROOT is set but PATH_INFO is not");
612 if (daemon_avoid_alias(pathinfo))
613 die("'%s': aliased", pathinfo);
614 end_url_with_slash(&buf, root);
615 if (pathinfo[0] == '/')
616 pathinfo++;
617 strbuf_addstr(&buf, pathinfo);
618 return strbuf_detach(&buf, NULL);
619 } else if (path && *path) {
620 return xstrdup(path);
621 } else
622 die("No GIT_PROJECT_ROOT or PATH_TRANSLATED from server");
623 return NULL;
624 }
625
626 static struct service_cmd {
627 const char *method;
628 const char *pattern;
629 void (*imp)(struct strbuf *, char *);
630 } services[] = {
631 {"GET", "/HEAD$", get_head},
632 {"GET", "/info/refs$", get_info_refs},
633 {"GET", "/objects/info/alternates$", get_text_file},
634 {"GET", "/objects/info/http-alternates$", get_text_file},
635 {"GET", "/objects/info/packs$", get_info_packs},
636 {"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{38}$", get_loose_object},
637 {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.pack$", get_pack_file},
638 {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.idx$", get_idx_file},
639
640 {"POST", "/git-upload-pack$", service_rpc},
641 {"POST", "/git-receive-pack$", service_rpc}
642 };
643
644 static int bad_request(struct strbuf *hdr, const struct service_cmd *c)
645 {
646 const char *proto = getenv("SERVER_PROTOCOL");
647
648 if (proto && !strcmp(proto, "HTTP/1.1")) {
649 http_status(hdr, 405, "Method Not Allowed");
650 hdr_str(hdr, "Allow",
651 !strcmp(c->method, "GET") ? "GET, HEAD" : c->method);
652 } else
653 http_status(hdr, 400, "Bad Request");
654 hdr_nocache(hdr);
655 end_headers(hdr);
656 return 0;
657 }
658
659 int cmd_main(int argc, const char **argv)
660 {
661 char *method = getenv("REQUEST_METHOD");
662 char *dir;
663 struct service_cmd *cmd = NULL;
664 char *cmd_arg = NULL;
665 int i;
666 struct strbuf hdr = STRBUF_INIT;
667
668 set_die_routine(die_webcgi);
669 set_die_is_recursing_routine(die_webcgi_recursing);
670
671 if (!method)
672 die("No REQUEST_METHOD from server");
673 if (!strcmp(method, "HEAD"))
674 method = "GET";
675 dir = getdir();
676
677 for (i = 0; i < ARRAY_SIZE(services); i++) {
678 struct service_cmd *c = &services[i];
679 regex_t re;
680 regmatch_t out[1];
681
682 if (regcomp(&re, c->pattern, REG_EXTENDED))
683 die("Bogus regex in service table: %s", c->pattern);
684 if (!regexec(&re, dir, 1, out, 0)) {
685 size_t n;
686
687 if (strcmp(method, c->method))
688 return bad_request(&hdr, c);
689
690 cmd = c;
691 n = out[0].rm_eo - out[0].rm_so;
692 cmd_arg = xmemdupz(dir + out[0].rm_so + 1, n - 1);
693 dir[out[0].rm_so] = 0;
694 break;
695 }
696 regfree(&re);
697 }
698
699 if (!cmd)
700 not_found(&hdr, "Request not supported: '%s'", dir);
701
702 setup_path();
703 if (!enter_repo(dir, 0))
704 not_found(&hdr, "Not a git repository: '%s'", dir);
705 if (!getenv("GIT_HTTP_EXPORT_ALL") &&
706 access("git-daemon-export-ok", F_OK) )
707 not_found(&hdr, "Repository not exported: '%s'", dir);
708
709 http_config();
710 max_request_buffer = git_env_ulong("GIT_HTTP_MAX_REQUEST_BUFFER",
711 max_request_buffer);
712
713 cmd->imp(&hdr, cmd_arg);
714 return 0;
715 }