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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 | #include "protocol.h" | |
16 | ||
17 | static const char content_type[] = "Content-Type"; | |
18 | static const char content_length[] = "Content-Length"; | |
19 | static const char last_modified[] = "Last-Modified"; | |
20 | static int getanyfile = 1; | |
21 | static unsigned long max_request_buffer = 10 * 1024 * 1024; | |
22 | ||
23 | static struct string_list *query_params; | |
24 | ||
25 | struct rpc_service { | |
26 | const char *name; | |
27 | const char *config_name; | |
28 | unsigned buffer_input : 1; | |
29 | signed enabled : 2; | |
30 | }; | |
31 | ||
32 | static struct rpc_service rpc_service[] = { | |
33 | { "upload-pack", "uploadpack", 1, 1 }, | |
34 | { "receive-pack", "receivepack", 0, -1 }, | |
35 | }; | |
36 | ||
37 | static struct string_list *get_parameters(void) | |
38 | { | |
39 | if (!query_params) { | |
40 | const char *query = getenv("QUERY_STRING"); | |
41 | ||
42 | query_params = xcalloc(1, sizeof(*query_params)); | |
43 | while (query && *query) { | |
44 | char *name = url_decode_parameter_name(&query); | |
45 | char *value = url_decode_parameter_value(&query); | |
46 | struct string_list_item *i; | |
47 | ||
48 | i = string_list_lookup(query_params, name); | |
49 | if (!i) | |
50 | i = string_list_insert(query_params, name); | |
51 | else | |
52 | free(i->util); | |
53 | i->util = value; | |
54 | } | |
55 | } | |
56 | return query_params; | |
57 | } | |
58 | ||
59 | static const char *get_parameter(const char *name) | |
60 | { | |
61 | struct string_list_item *i; | |
62 | i = string_list_lookup(get_parameters(), name); | |
63 | return i ? i->util : NULL; | |
64 | } | |
65 | ||
66 | __attribute__((format (printf, 2, 3))) | |
67 | static void format_write(int fd, const char *fmt, ...) | |
68 | { | |
69 | static char buffer[1024]; | |
70 | ||
71 | va_list args; | |
72 | unsigned n; | |
73 | ||
74 | va_start(args, fmt); | |
75 | n = vsnprintf(buffer, sizeof(buffer), fmt, args); | |
76 | va_end(args); | |
77 | if (n >= sizeof(buffer)) | |
78 | die("protocol error: impossibly long line"); | |
79 | ||
80 | write_or_die(fd, buffer, n); | |
81 | } | |
82 | ||
83 | static void http_status(struct strbuf *hdr, unsigned code, const char *msg) | |
84 | { | |
85 | strbuf_addf(hdr, "Status: %u %s\r\n", code, msg); | |
86 | } | |
87 | ||
88 | static void hdr_str(struct strbuf *hdr, const char *name, const char *value) | |
89 | { | |
90 | strbuf_addf(hdr, "%s: %s\r\n", name, value); | |
91 | } | |
92 | ||
93 | static void hdr_int(struct strbuf *hdr, const char *name, uintmax_t value) | |
94 | { | |
95 | strbuf_addf(hdr, "%s: %" PRIuMAX "\r\n", name, value); | |
96 | } | |
97 | ||
98 | static void hdr_date(struct strbuf *hdr, const char *name, timestamp_t when) | |
99 | { | |
100 | const char *value = show_date(when, 0, DATE_MODE(RFC2822)); | |
101 | hdr_str(hdr, name, value); | |
102 | } | |
103 | ||
104 | static void hdr_nocache(struct strbuf *hdr) | |
105 | { | |
106 | hdr_str(hdr, "Expires", "Fri, 01 Jan 1980 00:00:00 GMT"); | |
107 | hdr_str(hdr, "Pragma", "no-cache"); | |
108 | hdr_str(hdr, "Cache-Control", "no-cache, max-age=0, must-revalidate"); | |
109 | } | |
110 | ||
111 | static void hdr_cache_forever(struct strbuf *hdr) | |
112 | { | |
113 | timestamp_t now = time(NULL); | |
114 | hdr_date(hdr, "Date", now); | |
115 | hdr_date(hdr, "Expires", now + 31536000); | |
116 | hdr_str(hdr, "Cache-Control", "public, max-age=31536000"); | |
117 | } | |
118 | ||
119 | static void end_headers(struct strbuf *hdr) | |
120 | { | |
121 | strbuf_add(hdr, "\r\n", 2); | |
122 | write_or_die(1, hdr->buf, hdr->len); | |
123 | strbuf_release(hdr); | |
124 | } | |
125 | ||
126 | __attribute__((format (printf, 2, 3))) | |
127 | static NORETURN void not_found(struct strbuf *hdr, const char *err, ...) | |
128 | { | |
129 | va_list params; | |
130 | ||
131 | http_status(hdr, 404, "Not Found"); | |
132 | hdr_nocache(hdr); | |
133 | end_headers(hdr); | |
134 | ||
135 | va_start(params, err); | |
136 | if (err && *err) | |
137 | vfprintf(stderr, err, params); | |
138 | va_end(params); | |
139 | exit(0); | |
140 | } | |
141 | ||
142 | __attribute__((format (printf, 2, 3))) | |
143 | static NORETURN void forbidden(struct strbuf *hdr, const char *err, ...) | |
144 | { | |
145 | va_list params; | |
146 | ||
147 | http_status(hdr, 403, "Forbidden"); | |
148 | hdr_nocache(hdr); | |
149 | end_headers(hdr); | |
150 | ||
151 | va_start(params, err); | |
152 | if (err && *err) | |
153 | vfprintf(stderr, err, params); | |
154 | va_end(params); | |
155 | exit(0); | |
156 | } | |
157 | ||
158 | static void select_getanyfile(struct strbuf *hdr) | |
159 | { | |
160 | if (!getanyfile) | |
161 | forbidden(hdr, "Unsupported service: getanyfile"); | |
162 | } | |
163 | ||
164 | static void send_strbuf(struct strbuf *hdr, | |
165 | const char *type, struct strbuf *buf) | |
166 | { | |
167 | hdr_int(hdr, content_length, buf->len); | |
168 | hdr_str(hdr, content_type, type); | |
169 | end_headers(hdr); | |
170 | write_or_die(1, buf->buf, buf->len); | |
171 | } | |
172 | ||
173 | static void send_local_file(struct strbuf *hdr, const char *the_type, | |
174 | const char *name) | |
175 | { | |
176 | char *p = git_pathdup("%s", name); | |
177 | size_t buf_alloc = 8192; | |
178 | char *buf = xmalloc(buf_alloc); | |
179 | int fd; | |
180 | struct stat sb; | |
181 | ||
182 | fd = open(p, O_RDONLY); | |
183 | if (fd < 0) | |
184 | not_found(hdr, "Cannot open '%s': %s", p, strerror(errno)); | |
185 | if (fstat(fd, &sb) < 0) | |
186 | die_errno("Cannot stat '%s'", p); | |
187 | ||
188 | hdr_int(hdr, content_length, sb.st_size); | |
189 | hdr_str(hdr, content_type, the_type); | |
190 | hdr_date(hdr, last_modified, sb.st_mtime); | |
191 | end_headers(hdr); | |
192 | ||
193 | for (;;) { | |
194 | ssize_t n = xread(fd, buf, buf_alloc); | |
195 | if (n < 0) | |
196 | die_errno("Cannot read '%s'", p); | |
197 | if (!n) | |
198 | break; | |
199 | write_or_die(1, buf, n); | |
200 | } | |
201 | close(fd); | |
202 | free(buf); | |
203 | free(p); | |
204 | } | |
205 | ||
206 | static void get_text_file(struct strbuf *hdr, char *name) | |
207 | { | |
208 | select_getanyfile(hdr); | |
209 | hdr_nocache(hdr); | |
210 | send_local_file(hdr, "text/plain", name); | |
211 | } | |
212 | ||
213 | static void get_loose_object(struct strbuf *hdr, char *name) | |
214 | { | |
215 | select_getanyfile(hdr); | |
216 | hdr_cache_forever(hdr); | |
217 | send_local_file(hdr, "application/x-git-loose-object", name); | |
218 | } | |
219 | ||
220 | static void get_pack_file(struct strbuf *hdr, char *name) | |
221 | { | |
222 | select_getanyfile(hdr); | |
223 | hdr_cache_forever(hdr); | |
224 | send_local_file(hdr, "application/x-git-packed-objects", name); | |
225 | } | |
226 | ||
227 | static void get_idx_file(struct strbuf *hdr, char *name) | |
228 | { | |
229 | select_getanyfile(hdr); | |
230 | hdr_cache_forever(hdr); | |
231 | send_local_file(hdr, "application/x-git-packed-objects-toc", name); | |
232 | } | |
233 | ||
234 | static void http_config(void) | |
235 | { | |
236 | int i, value = 0; | |
237 | struct strbuf var = STRBUF_INIT; | |
238 | ||
239 | git_config_get_bool("http.getanyfile", &getanyfile); | |
240 | git_config_get_ulong("http.maxrequestbuffer", &max_request_buffer); | |
241 | ||
242 | for (i = 0; i < ARRAY_SIZE(rpc_service); i++) { | |
243 | struct rpc_service *svc = &rpc_service[i]; | |
244 | strbuf_addf(&var, "http.%s", svc->config_name); | |
245 | if (!git_config_get_bool(var.buf, &value)) | |
246 | svc->enabled = value; | |
247 | strbuf_reset(&var); | |
248 | } | |
249 | ||
250 | strbuf_release(&var); | |
251 | } | |
252 | ||
253 | static struct rpc_service *select_service(struct strbuf *hdr, const char *name) | |
254 | { | |
255 | const char *svc_name; | |
256 | struct rpc_service *svc = NULL; | |
257 | int i; | |
258 | ||
259 | if (!skip_prefix(name, "git-", &svc_name)) | |
260 | forbidden(hdr, "Unsupported service: '%s'", name); | |
261 | ||
262 | for (i = 0; i < ARRAY_SIZE(rpc_service); i++) { | |
263 | struct rpc_service *s = &rpc_service[i]; | |
264 | if (!strcmp(s->name, svc_name)) { | |
265 | svc = s; | |
266 | break; | |
267 | } | |
268 | } | |
269 | ||
270 | if (!svc) | |
271 | forbidden(hdr, "Unsupported service: '%s'", name); | |
272 | ||
273 | if (svc->enabled < 0) { | |
274 | const char *user = getenv("REMOTE_USER"); | |
275 | svc->enabled = (user && *user) ? 1 : 0; | |
276 | } | |
277 | if (!svc->enabled) | |
278 | forbidden(hdr, "Service not enabled: '%s'", svc->name); | |
279 | return svc; | |
280 | } | |
281 | ||
282 | static void write_to_child(int out, const unsigned char *buf, ssize_t len, const char *prog_name) | |
283 | { | |
284 | if (write_in_full(out, buf, len) < 0) | |
285 | die("unable to write to '%s'", prog_name); | |
286 | } | |
287 | ||
288 | /* | |
289 | * This is basically strbuf_read(), except that if we | |
290 | * hit max_request_buffer we die (we'd rather reject a | |
291 | * maliciously large request than chew up infinite memory). | |
292 | */ | |
293 | static ssize_t read_request_eof(int fd, unsigned char **out) | |
294 | { | |
295 | size_t len = 0, alloc = 8192; | |
296 | unsigned char *buf = xmalloc(alloc); | |
297 | ||
298 | if (max_request_buffer < alloc) | |
299 | max_request_buffer = alloc; | |
300 | ||
301 | while (1) { | |
302 | ssize_t cnt; | |
303 | ||
304 | cnt = read_in_full(fd, buf + len, alloc - len); | |
305 | if (cnt < 0) { | |
306 | free(buf); | |
307 | return -1; | |
308 | } | |
309 | ||
310 | /* partial read from read_in_full means we hit EOF */ | |
311 | len += cnt; | |
312 | if (len < alloc) { | |
313 | *out = buf; | |
314 | return len; | |
315 | } | |
316 | ||
317 | /* otherwise, grow and try again (if we can) */ | |
318 | if (alloc == max_request_buffer) | |
319 | die("request was larger than our maximum size (%lu);" | |
320 | " try setting GIT_HTTP_MAX_REQUEST_BUFFER", | |
321 | max_request_buffer); | |
322 | ||
323 | alloc = alloc_nr(alloc); | |
324 | if (alloc > max_request_buffer) | |
325 | alloc = max_request_buffer; | |
326 | REALLOC_ARRAY(buf, alloc); | |
327 | } | |
328 | } | |
329 | ||
330 | static ssize_t read_request_fixed_len(int fd, ssize_t req_len, unsigned char **out) | |
331 | { | |
332 | unsigned char *buf = NULL; | |
333 | ssize_t cnt = 0; | |
334 | ||
335 | if (max_request_buffer < req_len) { | |
336 | die("request was larger than our maximum size (%lu): " | |
337 | "%" PRIuMAX "; try setting GIT_HTTP_MAX_REQUEST_BUFFER", | |
338 | max_request_buffer, (uintmax_t)req_len); | |
339 | } | |
340 | ||
341 | buf = xmalloc(req_len); | |
342 | cnt = read_in_full(fd, buf, req_len); | |
343 | if (cnt < 0) { | |
344 | free(buf); | |
345 | return -1; | |
346 | } | |
347 | *out = buf; | |
348 | return cnt; | |
349 | } | |
350 | ||
351 | static ssize_t get_content_length(void) | |
352 | { | |
353 | ssize_t val = -1; | |
354 | const char *str = getenv("CONTENT_LENGTH"); | |
355 | ||
356 | if (str && *str && !git_parse_ssize_t(str, &val)) | |
357 | die("failed to parse CONTENT_LENGTH: %s", str); | |
358 | return val; | |
359 | } | |
360 | ||
361 | static ssize_t read_request(int fd, unsigned char **out, ssize_t req_len) | |
362 | { | |
363 | if (req_len < 0) | |
364 | return read_request_eof(fd, out); | |
365 | else | |
366 | return read_request_fixed_len(fd, req_len, out); | |
367 | } | |
368 | ||
369 | static void inflate_request(const char *prog_name, int out, int buffer_input, ssize_t req_len) | |
370 | { | |
371 | git_zstream stream; | |
372 | unsigned char *full_request = NULL; | |
373 | unsigned char in_buf[8192]; | |
374 | unsigned char out_buf[8192]; | |
375 | unsigned long cnt = 0; | |
376 | int req_len_defined = req_len >= 0; | |
377 | size_t req_remaining_len = req_len; | |
378 | ||
379 | memset(&stream, 0, sizeof(stream)); | |
380 | git_inflate_init_gzip_only(&stream); | |
381 | ||
382 | while (1) { | |
383 | ssize_t n; | |
384 | ||
385 | if (buffer_input) { | |
386 | if (full_request) | |
387 | n = 0; /* nothing left to read */ | |
388 | else | |
389 | n = read_request(0, &full_request, req_len); | |
390 | stream.next_in = full_request; | |
391 | } else { | |
392 | ssize_t buffer_len; | |
393 | if (req_len_defined && req_remaining_len <= sizeof(in_buf)) | |
394 | buffer_len = req_remaining_len; | |
395 | else | |
396 | buffer_len = sizeof(in_buf); | |
397 | n = xread(0, in_buf, buffer_len); | |
398 | stream.next_in = in_buf; | |
399 | if (req_len_defined && n > 0) | |
400 | req_remaining_len -= n; | |
401 | } | |
402 | ||
403 | if (n <= 0) | |
404 | die("request ended in the middle of the gzip stream"); | |
405 | stream.avail_in = n; | |
406 | ||
407 | while (0 < stream.avail_in) { | |
408 | int ret; | |
409 | ||
410 | stream.next_out = out_buf; | |
411 | stream.avail_out = sizeof(out_buf); | |
412 | ||
413 | ret = git_inflate(&stream, Z_NO_FLUSH); | |
414 | if (ret != Z_OK && ret != Z_STREAM_END) | |
415 | die("zlib error inflating request, result %d", ret); | |
416 | ||
417 | n = stream.total_out - cnt; | |
418 | write_to_child(out, out_buf, stream.total_out - cnt, prog_name); | |
419 | cnt = stream.total_out; | |
420 | ||
421 | if (ret == Z_STREAM_END) | |
422 | goto done; | |
423 | } | |
424 | } | |
425 | ||
426 | done: | |
427 | git_inflate_end(&stream); | |
428 | close(out); | |
429 | free(full_request); | |
430 | } | |
431 | ||
432 | static void copy_request(const char *prog_name, int out, ssize_t req_len) | |
433 | { | |
434 | unsigned char *buf; | |
435 | ssize_t n = read_request(0, &buf, req_len); | |
436 | if (n < 0) | |
437 | die_errno("error reading request body"); | |
438 | write_to_child(out, buf, n, prog_name); | |
439 | close(out); | |
440 | free(buf); | |
441 | } | |
442 | ||
443 | static void pipe_fixed_length(const char *prog_name, int out, size_t req_len) | |
444 | { | |
445 | unsigned char buf[8192]; | |
446 | size_t remaining_len = req_len; | |
447 | ||
448 | while (remaining_len > 0) { | |
449 | size_t chunk_length = remaining_len > sizeof(buf) ? sizeof(buf) : remaining_len; | |
450 | ssize_t n = xread(0, buf, chunk_length); | |
451 | if (n < 0) | |
452 | die_errno("Reading request failed"); | |
453 | write_to_child(out, buf, n, prog_name); | |
454 | remaining_len -= n; | |
455 | } | |
456 | ||
457 | close(out); | |
458 | } | |
459 | ||
460 | static void run_service(const char **argv, int buffer_input) | |
461 | { | |
462 | const char *encoding = getenv("HTTP_CONTENT_ENCODING"); | |
463 | const char *user = getenv("REMOTE_USER"); | |
464 | const char *host = getenv("REMOTE_ADDR"); | |
465 | int gzipped_request = 0; | |
466 | struct child_process cld = CHILD_PROCESS_INIT; | |
467 | ssize_t req_len = get_content_length(); | |
468 | ||
469 | if (encoding && !strcmp(encoding, "gzip")) | |
470 | gzipped_request = 1; | |
471 | else if (encoding && !strcmp(encoding, "x-gzip")) | |
472 | gzipped_request = 1; | |
473 | ||
474 | if (!user || !*user) | |
475 | user = "anonymous"; | |
476 | if (!host || !*host) | |
477 | host = "(none)"; | |
478 | ||
479 | if (!getenv("GIT_COMMITTER_NAME")) | |
480 | argv_array_pushf(&cld.env_array, "GIT_COMMITTER_NAME=%s", user); | |
481 | if (!getenv("GIT_COMMITTER_EMAIL")) | |
482 | argv_array_pushf(&cld.env_array, | |
483 | "GIT_COMMITTER_EMAIL=%s@http.%s", user, host); | |
484 | ||
485 | cld.argv = argv; | |
486 | if (buffer_input || gzipped_request || req_len >= 0) | |
487 | cld.in = -1; | |
488 | cld.git_cmd = 1; | |
489 | cld.clean_on_exit = 1; | |
490 | cld.wait_after_clean = 1; | |
491 | if (start_command(&cld)) | |
492 | exit(1); | |
493 | ||
494 | close(1); | |
495 | if (gzipped_request) | |
496 | inflate_request(argv[0], cld.in, buffer_input, req_len); | |
497 | else if (buffer_input) | |
498 | copy_request(argv[0], cld.in, req_len); | |
499 | else if (req_len >= 0) | |
500 | pipe_fixed_length(argv[0], cld.in, req_len); | |
501 | else | |
502 | close(0); | |
503 | ||
504 | if (finish_command(&cld)) | |
505 | exit(1); | |
506 | } | |
507 | ||
508 | static int show_text_ref(const char *name, const struct object_id *oid, | |
509 | int flag, void *cb_data) | |
510 | { | |
511 | const char *name_nons = strip_namespace(name); | |
512 | struct strbuf *buf = cb_data; | |
513 | struct object *o = parse_object(the_repository, oid); | |
514 | if (!o) | |
515 | return 0; | |
516 | ||
517 | strbuf_addf(buf, "%s\t%s\n", oid_to_hex(oid), name_nons); | |
518 | if (o->type == OBJ_TAG) { | |
519 | o = deref_tag(the_repository, o, name, 0); | |
520 | if (!o) | |
521 | return 0; | |
522 | strbuf_addf(buf, "%s\t%s^{}\n", oid_to_hex(&o->oid), | |
523 | name_nons); | |
524 | } | |
525 | return 0; | |
526 | } | |
527 | ||
528 | static void get_info_refs(struct strbuf *hdr, char *arg) | |
529 | { | |
530 | const char *service_name = get_parameter("service"); | |
531 | struct strbuf buf = STRBUF_INIT; | |
532 | ||
533 | hdr_nocache(hdr); | |
534 | ||
535 | if (service_name) { | |
536 | const char *argv[] = {NULL /* service name */, | |
537 | "--stateless-rpc", "--advertise-refs", | |
538 | ".", NULL}; | |
539 | struct rpc_service *svc = select_service(hdr, service_name); | |
540 | ||
541 | strbuf_addf(&buf, "application/x-git-%s-advertisement", | |
542 | svc->name); | |
543 | hdr_str(hdr, content_type, buf.buf); | |
544 | end_headers(hdr); | |
545 | ||
546 | ||
547 | if (determine_protocol_version_server() != protocol_v2) { | |
548 | packet_write_fmt(1, "# service=git-%s\n", svc->name); | |
549 | packet_flush(1); | |
550 | } | |
551 | ||
552 | argv[0] = svc->name; | |
553 | run_service(argv, 0); | |
554 | ||
555 | } else { | |
556 | select_getanyfile(hdr); | |
557 | for_each_namespaced_ref(show_text_ref, &buf); | |
558 | send_strbuf(hdr, "text/plain", &buf); | |
559 | } | |
560 | strbuf_release(&buf); | |
561 | } | |
562 | ||
563 | static int show_head_ref(const char *refname, const struct object_id *oid, | |
564 | int flag, void *cb_data) | |
565 | { | |
566 | struct strbuf *buf = cb_data; | |
567 | ||
568 | if (flag & REF_ISSYMREF) { | |
569 | const char *target = resolve_ref_unsafe(refname, | |
570 | RESOLVE_REF_READING, | |
571 | NULL, NULL); | |
572 | ||
573 | if (target) | |
574 | strbuf_addf(buf, "ref: %s\n", strip_namespace(target)); | |
575 | } else { | |
576 | strbuf_addf(buf, "%s\n", oid_to_hex(oid)); | |
577 | } | |
578 | ||
579 | return 0; | |
580 | } | |
581 | ||
582 | static void get_head(struct strbuf *hdr, char *arg) | |
583 | { | |
584 | struct strbuf buf = STRBUF_INIT; | |
585 | ||
586 | select_getanyfile(hdr); | |
587 | head_ref_namespaced(show_head_ref, &buf); | |
588 | send_strbuf(hdr, "text/plain", &buf); | |
589 | strbuf_release(&buf); | |
590 | } | |
591 | ||
592 | static void get_info_packs(struct strbuf *hdr, char *arg) | |
593 | { | |
594 | size_t objdirlen = strlen(get_object_directory()); | |
595 | struct strbuf buf = STRBUF_INIT; | |
596 | struct packed_git *p; | |
597 | size_t cnt = 0; | |
598 | ||
599 | select_getanyfile(hdr); | |
600 | for (p = get_all_packs(the_repository); p; p = p->next) { | |
601 | if (p->pack_local) | |
602 | cnt++; | |
603 | } | |
604 | ||
605 | strbuf_grow(&buf, cnt * 53 + 2); | |
606 | for (p = get_all_packs(the_repository); p; p = p->next) { | |
607 | if (p->pack_local) | |
608 | strbuf_addf(&buf, "P %s\n", p->pack_name + objdirlen + 6); | |
609 | } | |
610 | strbuf_addch(&buf, '\n'); | |
611 | ||
612 | hdr_nocache(hdr); | |
613 | send_strbuf(hdr, "text/plain; charset=utf-8", &buf); | |
614 | strbuf_release(&buf); | |
615 | } | |
616 | ||
617 | static void check_content_type(struct strbuf *hdr, const char *accepted_type) | |
618 | { | |
619 | const char *actual_type = getenv("CONTENT_TYPE"); | |
620 | ||
621 | if (!actual_type) | |
622 | actual_type = ""; | |
623 | ||
624 | if (strcmp(actual_type, accepted_type)) { | |
625 | http_status(hdr, 415, "Unsupported Media Type"); | |
626 | hdr_nocache(hdr); | |
627 | end_headers(hdr); | |
628 | format_write(1, | |
629 | "Expected POST with Content-Type '%s'," | |
630 | " but received '%s' instead.\n", | |
631 | accepted_type, actual_type); | |
632 | exit(0); | |
633 | } | |
634 | } | |
635 | ||
636 | static void service_rpc(struct strbuf *hdr, char *service_name) | |
637 | { | |
638 | const char *argv[] = {NULL, "--stateless-rpc", ".", NULL}; | |
639 | struct rpc_service *svc = select_service(hdr, service_name); | |
640 | struct strbuf buf = STRBUF_INIT; | |
641 | ||
642 | strbuf_reset(&buf); | |
643 | strbuf_addf(&buf, "application/x-git-%s-request", svc->name); | |
644 | check_content_type(hdr, buf.buf); | |
645 | ||
646 | hdr_nocache(hdr); | |
647 | ||
648 | strbuf_reset(&buf); | |
649 | strbuf_addf(&buf, "application/x-git-%s-result", svc->name); | |
650 | hdr_str(hdr, content_type, buf.buf); | |
651 | ||
652 | end_headers(hdr); | |
653 | ||
654 | argv[0] = svc->name; | |
655 | run_service(argv, svc->buffer_input); | |
656 | strbuf_release(&buf); | |
657 | } | |
658 | ||
659 | static int dead; | |
660 | static NORETURN void die_webcgi(const char *err, va_list params) | |
661 | { | |
662 | if (dead <= 1) { | |
663 | struct strbuf hdr = STRBUF_INIT; | |
664 | ||
665 | vreportf("fatal: ", err, params); | |
666 | ||
667 | http_status(&hdr, 500, "Internal Server Error"); | |
668 | hdr_nocache(&hdr); | |
669 | end_headers(&hdr); | |
670 | } | |
671 | exit(0); /* we successfully reported a failure ;-) */ | |
672 | } | |
673 | ||
674 | static int die_webcgi_recursing(void) | |
675 | { | |
676 | return dead++ > 1; | |
677 | } | |
678 | ||
679 | static char* getdir(void) | |
680 | { | |
681 | struct strbuf buf = STRBUF_INIT; | |
682 | char *pathinfo = getenv("PATH_INFO"); | |
683 | char *root = getenv("GIT_PROJECT_ROOT"); | |
684 | char *path = getenv("PATH_TRANSLATED"); | |
685 | ||
686 | if (root && *root) { | |
687 | if (!pathinfo || !*pathinfo) | |
688 | die("GIT_PROJECT_ROOT is set but PATH_INFO is not"); | |
689 | if (daemon_avoid_alias(pathinfo)) | |
690 | die("'%s': aliased", pathinfo); | |
691 | end_url_with_slash(&buf, root); | |
692 | if (pathinfo[0] == '/') | |
693 | pathinfo++; | |
694 | strbuf_addstr(&buf, pathinfo); | |
695 | return strbuf_detach(&buf, NULL); | |
696 | } else if (path && *path) { | |
697 | return xstrdup(path); | |
698 | } else | |
699 | die("No GIT_PROJECT_ROOT or PATH_TRANSLATED from server"); | |
700 | return NULL; | |
701 | } | |
702 | ||
703 | static struct service_cmd { | |
704 | const char *method; | |
705 | const char *pattern; | |
706 | void (*imp)(struct strbuf *, char *); | |
707 | } services[] = { | |
708 | {"GET", "/HEAD$", get_head}, | |
709 | {"GET", "/info/refs$", get_info_refs}, | |
710 | {"GET", "/objects/info/alternates$", get_text_file}, | |
711 | {"GET", "/objects/info/http-alternates$", get_text_file}, | |
712 | {"GET", "/objects/info/packs$", get_info_packs}, | |
713 | {"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{38}$", get_loose_object}, | |
714 | {"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{62}$", get_loose_object}, | |
715 | {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.pack$", get_pack_file}, | |
716 | {"GET", "/objects/pack/pack-[0-9a-f]{64}\\.pack$", get_pack_file}, | |
717 | {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.idx$", get_idx_file}, | |
718 | {"GET", "/objects/pack/pack-[0-9a-f]{64}\\.idx$", get_idx_file}, | |
719 | ||
720 | {"POST", "/git-upload-pack$", service_rpc}, | |
721 | {"POST", "/git-receive-pack$", service_rpc} | |
722 | }; | |
723 | ||
724 | static int bad_request(struct strbuf *hdr, const struct service_cmd *c) | |
725 | { | |
726 | const char *proto = getenv("SERVER_PROTOCOL"); | |
727 | ||
728 | if (proto && !strcmp(proto, "HTTP/1.1")) { | |
729 | http_status(hdr, 405, "Method Not Allowed"); | |
730 | hdr_str(hdr, "Allow", | |
731 | !strcmp(c->method, "GET") ? "GET, HEAD" : c->method); | |
732 | } else | |
733 | http_status(hdr, 400, "Bad Request"); | |
734 | hdr_nocache(hdr); | |
735 | end_headers(hdr); | |
736 | return 0; | |
737 | } | |
738 | ||
739 | int cmd_main(int argc, const char **argv) | |
740 | { | |
741 | char *method = getenv("REQUEST_METHOD"); | |
742 | char *dir; | |
743 | struct service_cmd *cmd = NULL; | |
744 | char *cmd_arg = NULL; | |
745 | int i; | |
746 | struct strbuf hdr = STRBUF_INIT; | |
747 | ||
748 | set_die_routine(die_webcgi); | |
749 | set_die_is_recursing_routine(die_webcgi_recursing); | |
750 | ||
751 | if (!method) | |
752 | die("No REQUEST_METHOD from server"); | |
753 | if (!strcmp(method, "HEAD")) | |
754 | method = "GET"; | |
755 | dir = getdir(); | |
756 | ||
757 | for (i = 0; i < ARRAY_SIZE(services); i++) { | |
758 | struct service_cmd *c = &services[i]; | |
759 | regex_t re; | |
760 | regmatch_t out[1]; | |
761 | ||
762 | if (regcomp(&re, c->pattern, REG_EXTENDED)) | |
763 | die("Bogus regex in service table: %s", c->pattern); | |
764 | if (!regexec(&re, dir, 1, out, 0)) { | |
765 | size_t n; | |
766 | ||
767 | if (strcmp(method, c->method)) | |
768 | return bad_request(&hdr, c); | |
769 | ||
770 | cmd = c; | |
771 | n = out[0].rm_eo - out[0].rm_so; | |
772 | cmd_arg = xmemdupz(dir + out[0].rm_so + 1, n - 1); | |
773 | dir[out[0].rm_so] = 0; | |
774 | break; | |
775 | } | |
776 | regfree(&re); | |
777 | } | |
778 | ||
779 | if (!cmd) | |
780 | not_found(&hdr, "Request not supported: '%s'", dir); | |
781 | ||
782 | setup_path(); | |
783 | if (!enter_repo(dir, 0)) | |
784 | not_found(&hdr, "Not a git repository: '%s'", dir); | |
785 | if (!getenv("GIT_HTTP_EXPORT_ALL") && | |
786 | access("git-daemon-export-ok", F_OK) ) | |
787 | not_found(&hdr, "Repository not exported: '%s'", dir); | |
788 | ||
789 | http_config(); | |
790 | max_request_buffer = git_env_ulong("GIT_HTTP_MAX_REQUEST_BUFFER", | |
791 | max_request_buffer); | |
792 | ||
793 | cmd->imp(&hdr, cmd_arg); | |
794 | return 0; | |
795 | } |