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Commit | Line | Data |
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2f4038ab SP |
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" | |
556cfa3b SP |
7 | #include "run-command.h" |
8 | #include "string-list.h" | |
2f4038ab SP |
9 | |
10 | static const char content_type[] = "Content-Type"; | |
11 | static const char content_length[] = "Content-Length"; | |
12 | static const char last_modified[] = "Last-Modified"; | |
13 | ||
556cfa3b SP |
14 | static struct string_list *query_params; |
15 | ||
16 | struct rpc_service { | |
17 | const char *name; | |
18 | const char *config_name; | |
19 | signed enabled : 2; | |
20 | }; | |
21 | ||
22 | static struct rpc_service rpc_service[] = { | |
23 | { "upload-pack", "uploadpack", 1 }, | |
24 | { "receive-pack", "receivepack", -1 }, | |
25 | }; | |
26 | ||
27 | static int decode_char(const char *q) | |
28 | { | |
29 | int i; | |
30 | unsigned char val = 0; | |
31 | for (i = 0; i < 2; i++) { | |
32 | unsigned char c = *q++; | |
33 | val <<= 4; | |
34 | if (c >= '0' && c <= '9') | |
35 | val += c - '0'; | |
36 | else if (c >= 'a' && c <= 'f') | |
37 | val += c - 'a' + 10; | |
38 | else if (c >= 'A' && c <= 'F') | |
39 | val += c - 'A' + 10; | |
40 | else | |
41 | return -1; | |
42 | } | |
43 | return val; | |
44 | } | |
45 | ||
46 | static char *decode_parameter(const char **query, int is_name) | |
47 | { | |
48 | const char *q = *query; | |
49 | struct strbuf out; | |
50 | ||
51 | strbuf_init(&out, 16); | |
52 | do { | |
53 | unsigned char c = *q; | |
54 | ||
55 | if (!c) | |
56 | break; | |
57 | if (c == '&' || (is_name && c == '=')) { | |
58 | q++; | |
59 | break; | |
60 | } | |
61 | ||
62 | if (c == '%') { | |
63 | int val = decode_char(q + 1); | |
64 | if (0 <= val) { | |
65 | strbuf_addch(&out, val); | |
66 | q += 3; | |
67 | continue; | |
68 | } | |
69 | } | |
70 | ||
71 | if (c == '+') | |
72 | strbuf_addch(&out, ' '); | |
73 | else | |
74 | strbuf_addch(&out, c); | |
75 | q++; | |
76 | } while (1); | |
77 | *query = q; | |
78 | return strbuf_detach(&out, NULL); | |
79 | } | |
80 | ||
81 | static struct string_list *get_parameters(void) | |
82 | { | |
83 | if (!query_params) { | |
84 | const char *query = getenv("QUERY_STRING"); | |
85 | ||
86 | query_params = xcalloc(1, sizeof(*query_params)); | |
87 | while (query && *query) { | |
88 | char *name = decode_parameter(&query, 1); | |
89 | char *value = decode_parameter(&query, 0); | |
90 | struct string_list_item *i; | |
91 | ||
92 | i = string_list_lookup(name, query_params); | |
93 | if (!i) | |
94 | i = string_list_insert(name, query_params); | |
95 | else | |
96 | free(i->util); | |
97 | i->util = value; | |
98 | } | |
99 | } | |
100 | return query_params; | |
101 | } | |
102 | ||
103 | static const char *get_parameter(const char *name) | |
104 | { | |
105 | struct string_list_item *i; | |
106 | i = string_list_lookup(name, get_parameters()); | |
107 | return i ? i->util : NULL; | |
108 | } | |
109 | ||
2f4038ab SP |
110 | static void format_write(int fd, const char *fmt, ...) |
111 | { | |
112 | static char buffer[1024]; | |
113 | ||
114 | va_list args; | |
115 | unsigned n; | |
116 | ||
117 | va_start(args, fmt); | |
118 | n = vsnprintf(buffer, sizeof(buffer), fmt, args); | |
119 | va_end(args); | |
120 | if (n >= sizeof(buffer)) | |
121 | die("protocol error: impossibly long line"); | |
122 | ||
123 | safe_write(fd, buffer, n); | |
124 | } | |
125 | ||
126 | static void http_status(unsigned code, const char *msg) | |
127 | { | |
128 | format_write(1, "Status: %u %s\r\n", code, msg); | |
129 | } | |
130 | ||
131 | static void hdr_str(const char *name, const char *value) | |
132 | { | |
133 | format_write(1, "%s: %s\r\n", name, value); | |
134 | } | |
135 | ||
136 | static void hdr_int(const char *name, size_t value) | |
137 | { | |
138 | format_write(1, "%s: %" PRIuMAX "\r\n", name, value); | |
139 | } | |
140 | ||
141 | static void hdr_date(const char *name, unsigned long when) | |
142 | { | |
143 | const char *value = show_date(when, 0, DATE_RFC2822); | |
144 | hdr_str(name, value); | |
145 | } | |
146 | ||
147 | static void hdr_nocache(void) | |
148 | { | |
149 | hdr_str("Expires", "Fri, 01 Jan 1980 00:00:00 GMT"); | |
150 | hdr_str("Pragma", "no-cache"); | |
151 | hdr_str("Cache-Control", "no-cache, max-age=0, must-revalidate"); | |
152 | } | |
153 | ||
154 | static void hdr_cache_forever(void) | |
155 | { | |
156 | unsigned long now = time(NULL); | |
157 | hdr_date("Date", now); | |
158 | hdr_date("Expires", now + 31536000); | |
159 | hdr_str("Cache-Control", "public, max-age=31536000"); | |
160 | } | |
161 | ||
162 | static void end_headers(void) | |
163 | { | |
164 | safe_write(1, "\r\n", 2); | |
165 | } | |
166 | ||
167 | static NORETURN void not_found(const char *err, ...) | |
168 | { | |
169 | va_list params; | |
170 | ||
171 | http_status(404, "Not Found"); | |
172 | hdr_nocache(); | |
173 | end_headers(); | |
174 | ||
175 | va_start(params, err); | |
176 | if (err && *err) | |
177 | vfprintf(stderr, err, params); | |
178 | va_end(params); | |
179 | exit(0); | |
180 | } | |
181 | ||
556cfa3b SP |
182 | static NORETURN void forbidden(const char *err, ...) |
183 | { | |
184 | va_list params; | |
185 | ||
186 | http_status(403, "Forbidden"); | |
187 | hdr_nocache(); | |
188 | end_headers(); | |
189 | ||
190 | va_start(params, err); | |
191 | if (err && *err) | |
192 | vfprintf(stderr, err, params); | |
193 | va_end(params); | |
194 | exit(0); | |
195 | } | |
196 | ||
2f4038ab SP |
197 | static void send_strbuf(const char *type, struct strbuf *buf) |
198 | { | |
199 | hdr_int(content_length, buf->len); | |
200 | hdr_str(content_type, type); | |
201 | end_headers(); | |
202 | safe_write(1, buf->buf, buf->len); | |
203 | } | |
204 | ||
205 | static void send_file(const char *the_type, const char *name) | |
206 | { | |
207 | const char *p = git_path("%s", name); | |
208 | size_t buf_alloc = 8192; | |
209 | char *buf = xmalloc(buf_alloc); | |
210 | int fd; | |
211 | struct stat sb; | |
212 | size_t size; | |
213 | ||
214 | fd = open(p, O_RDONLY); | |
215 | if (fd < 0) | |
216 | not_found("Cannot open '%s': %s", p, strerror(errno)); | |
217 | if (fstat(fd, &sb) < 0) | |
218 | die_errno("Cannot stat '%s'", p); | |
219 | ||
220 | size = xsize_t(sb.st_size); | |
221 | ||
222 | hdr_int(content_length, size); | |
223 | hdr_str(content_type, the_type); | |
224 | hdr_date(last_modified, sb.st_mtime); | |
225 | end_headers(); | |
226 | ||
227 | while (size) { | |
228 | ssize_t n = xread(fd, buf, buf_alloc); | |
229 | if (n < 0) | |
230 | die_errno("Cannot read '%s'", p); | |
231 | if (!n) | |
232 | break; | |
233 | safe_write(1, buf, n); | |
234 | } | |
235 | close(fd); | |
236 | free(buf); | |
237 | } | |
238 | ||
239 | static void get_text_file(char *name) | |
240 | { | |
241 | hdr_nocache(); | |
242 | send_file("text/plain", name); | |
243 | } | |
244 | ||
245 | static void get_loose_object(char *name) | |
246 | { | |
247 | hdr_cache_forever(); | |
248 | send_file("application/x-git-loose-object", name); | |
249 | } | |
250 | ||
251 | static void get_pack_file(char *name) | |
252 | { | |
253 | hdr_cache_forever(); | |
254 | send_file("application/x-git-packed-objects", name); | |
255 | } | |
256 | ||
257 | static void get_idx_file(char *name) | |
258 | { | |
259 | hdr_cache_forever(); | |
260 | send_file("application/x-git-packed-objects-toc", name); | |
261 | } | |
262 | ||
556cfa3b SP |
263 | static int http_config(const char *var, const char *value, void *cb) |
264 | { | |
265 | struct rpc_service *svc = cb; | |
266 | ||
267 | if (!prefixcmp(var, "http.") && | |
268 | !strcmp(var + 5, svc->config_name)) { | |
269 | svc->enabled = git_config_bool(var, value); | |
270 | return 0; | |
271 | } | |
272 | ||
273 | /* we are not interested in parsing any other configuration here */ | |
274 | return 0; | |
275 | } | |
276 | ||
277 | static struct rpc_service *select_service(const char *name) | |
278 | { | |
279 | struct rpc_service *svc = NULL; | |
280 | int i; | |
281 | ||
282 | if (prefixcmp(name, "git-")) | |
283 | forbidden("Unsupported service: '%s'", name); | |
284 | ||
285 | for (i = 0; i < ARRAY_SIZE(rpc_service); i++) { | |
286 | struct rpc_service *s = &rpc_service[i]; | |
287 | if (!strcmp(s->name, name + 4)) { | |
288 | svc = s; | |
289 | break; | |
290 | } | |
291 | } | |
292 | ||
293 | if (!svc) | |
294 | forbidden("Unsupported service: '%s'", name); | |
295 | ||
296 | git_config(http_config, svc); | |
297 | if (svc->enabled < 0) { | |
298 | const char *user = getenv("REMOTE_USER"); | |
299 | svc->enabled = (user && *user) ? 1 : 0; | |
300 | } | |
301 | if (!svc->enabled) | |
302 | forbidden("Service not enabled: '%s'", svc->name); | |
303 | return svc; | |
304 | } | |
305 | ||
306 | static void inflate_request(const char *prog_name, int out) | |
307 | { | |
308 | z_stream stream; | |
309 | unsigned char in_buf[8192]; | |
310 | unsigned char out_buf[8192]; | |
311 | unsigned long cnt = 0; | |
312 | int ret; | |
313 | ||
314 | memset(&stream, 0, sizeof(stream)); | |
315 | ret = inflateInit2(&stream, (15 + 16)); | |
316 | if (ret != Z_OK) | |
317 | die("cannot start zlib inflater, zlib err %d", ret); | |
318 | ||
319 | while (1) { | |
320 | ssize_t n = xread(0, in_buf, sizeof(in_buf)); | |
321 | if (n <= 0) | |
322 | die("request ended in the middle of the gzip stream"); | |
323 | ||
324 | stream.next_in = in_buf; | |
325 | stream.avail_in = n; | |
326 | ||
327 | while (0 < stream.avail_in) { | |
328 | int ret; | |
329 | ||
330 | stream.next_out = out_buf; | |
331 | stream.avail_out = sizeof(out_buf); | |
332 | ||
333 | ret = inflate(&stream, Z_NO_FLUSH); | |
334 | if (ret != Z_OK && ret != Z_STREAM_END) | |
335 | die("zlib error inflating request, result %d", ret); | |
336 | ||
337 | n = stream.total_out - cnt; | |
338 | if (write_in_full(out, out_buf, n) != n) | |
339 | die("%s aborted reading request", prog_name); | |
340 | cnt += n; | |
341 | ||
342 | if (ret == Z_STREAM_END) | |
343 | goto done; | |
344 | } | |
345 | } | |
346 | ||
347 | done: | |
348 | inflateEnd(&stream); | |
349 | close(out); | |
350 | } | |
351 | ||
352 | static void run_service(const char **argv) | |
353 | { | |
354 | const char *encoding = getenv("HTTP_CONTENT_ENCODING"); | |
355 | const char *user = getenv("REMOTE_USER"); | |
356 | const char *host = getenv("REMOTE_ADDR"); | |
357 | char *env[3]; | |
358 | struct strbuf buf = STRBUF_INIT; | |
359 | int gzipped_request = 0; | |
360 | struct child_process cld; | |
361 | ||
362 | if (encoding && !strcmp(encoding, "gzip")) | |
363 | gzipped_request = 1; | |
364 | else if (encoding && !strcmp(encoding, "x-gzip")) | |
365 | gzipped_request = 1; | |
366 | ||
367 | if (!user || !*user) | |
368 | user = "anonymous"; | |
369 | if (!host || !*host) | |
370 | host = "(none)"; | |
371 | ||
372 | memset(&env, 0, sizeof(env)); | |
373 | strbuf_addf(&buf, "GIT_COMMITTER_NAME=%s", user); | |
374 | env[0] = strbuf_detach(&buf, NULL); | |
375 | ||
376 | strbuf_addf(&buf, "GIT_COMMITTER_EMAIL=%s@http.%s", user, host); | |
377 | env[1] = strbuf_detach(&buf, NULL); | |
378 | env[2] = NULL; | |
379 | ||
380 | memset(&cld, 0, sizeof(cld)); | |
381 | cld.argv = argv; | |
382 | cld.env = (const char *const *)env; | |
383 | if (gzipped_request) | |
384 | cld.in = -1; | |
385 | cld.git_cmd = 1; | |
386 | if (start_command(&cld)) | |
387 | exit(1); | |
388 | ||
389 | close(1); | |
390 | if (gzipped_request) | |
391 | inflate_request(argv[0], cld.in); | |
392 | else | |
393 | close(0); | |
394 | ||
395 | if (finish_command(&cld)) | |
396 | exit(1); | |
397 | free(env[0]); | |
398 | free(env[1]); | |
399 | strbuf_release(&buf); | |
400 | } | |
401 | ||
2f4038ab SP |
402 | static int show_text_ref(const char *name, const unsigned char *sha1, |
403 | int flag, void *cb_data) | |
404 | { | |
405 | struct strbuf *buf = cb_data; | |
406 | struct object *o = parse_object(sha1); | |
407 | if (!o) | |
408 | return 0; | |
409 | ||
410 | strbuf_addf(buf, "%s\t%s\n", sha1_to_hex(sha1), name); | |
411 | if (o->type == OBJ_TAG) { | |
412 | o = deref_tag(o, name, 0); | |
413 | if (!o) | |
414 | return 0; | |
415 | strbuf_addf(buf, "%s\t%s^{}\n", sha1_to_hex(o->sha1), name); | |
416 | } | |
417 | return 0; | |
418 | } | |
419 | ||
420 | static void get_info_refs(char *arg) | |
421 | { | |
556cfa3b | 422 | const char *service_name = get_parameter("service"); |
2f4038ab SP |
423 | struct strbuf buf = STRBUF_INIT; |
424 | ||
2f4038ab | 425 | hdr_nocache(); |
556cfa3b SP |
426 | |
427 | if (service_name) { | |
428 | const char *argv[] = {NULL /* service name */, | |
429 | "--stateless-rpc", "--advertise-refs", | |
430 | ".", NULL}; | |
431 | struct rpc_service *svc = select_service(service_name); | |
432 | ||
433 | strbuf_addf(&buf, "application/x-git-%s-advertisement", | |
434 | svc->name); | |
435 | hdr_str(content_type, buf.buf); | |
436 | end_headers(); | |
437 | ||
438 | packet_write(1, "# service=git-%s\n", svc->name); | |
439 | packet_flush(1); | |
440 | ||
441 | argv[0] = svc->name; | |
442 | run_service(argv); | |
443 | ||
444 | } else { | |
445 | for_each_ref(show_text_ref, &buf); | |
446 | send_strbuf("text/plain", &buf); | |
447 | } | |
2f4038ab SP |
448 | strbuf_release(&buf); |
449 | } | |
450 | ||
451 | static void get_info_packs(char *arg) | |
452 | { | |
453 | size_t objdirlen = strlen(get_object_directory()); | |
454 | struct strbuf buf = STRBUF_INIT; | |
455 | struct packed_git *p; | |
456 | size_t cnt = 0; | |
457 | ||
458 | prepare_packed_git(); | |
459 | for (p = packed_git; p; p = p->next) { | |
460 | if (p->pack_local) | |
461 | cnt++; | |
462 | } | |
463 | ||
464 | strbuf_grow(&buf, cnt * 53 + 2); | |
465 | for (p = packed_git; p; p = p->next) { | |
466 | if (p->pack_local) | |
467 | strbuf_addf(&buf, "P %s\n", p->pack_name + objdirlen + 6); | |
468 | } | |
469 | strbuf_addch(&buf, '\n'); | |
470 | ||
471 | hdr_nocache(); | |
472 | send_strbuf("text/plain; charset=utf-8", &buf); | |
473 | strbuf_release(&buf); | |
474 | } | |
475 | ||
556cfa3b SP |
476 | static void check_content_type(const char *accepted_type) |
477 | { | |
478 | const char *actual_type = getenv("CONTENT_TYPE"); | |
479 | ||
480 | if (!actual_type) | |
481 | actual_type = ""; | |
482 | ||
483 | if (strcmp(actual_type, accepted_type)) { | |
484 | http_status(415, "Unsupported Media Type"); | |
485 | hdr_nocache(); | |
486 | end_headers(); | |
487 | format_write(1, | |
488 | "Expected POST with Content-Type '%s'," | |
489 | " but received '%s' instead.\n", | |
490 | accepted_type, actual_type); | |
491 | exit(0); | |
492 | } | |
493 | } | |
494 | ||
495 | static void service_rpc(char *service_name) | |
496 | { | |
497 | const char *argv[] = {NULL, "--stateless-rpc", ".", NULL}; | |
498 | struct rpc_service *svc = select_service(service_name); | |
499 | struct strbuf buf = STRBUF_INIT; | |
500 | ||
501 | strbuf_reset(&buf); | |
502 | strbuf_addf(&buf, "application/x-git-%s-request", svc->name); | |
503 | check_content_type(buf.buf); | |
504 | ||
505 | hdr_nocache(); | |
506 | ||
507 | strbuf_reset(&buf); | |
508 | strbuf_addf(&buf, "application/x-git-%s-result", svc->name); | |
509 | hdr_str(content_type, buf.buf); | |
510 | ||
511 | end_headers(); | |
512 | ||
513 | argv[0] = svc->name; | |
514 | run_service(argv); | |
515 | strbuf_release(&buf); | |
516 | } | |
517 | ||
2f4038ab SP |
518 | static NORETURN void die_webcgi(const char *err, va_list params) |
519 | { | |
520 | char buffer[1000]; | |
521 | ||
522 | http_status(500, "Internal Server Error"); | |
523 | hdr_nocache(); | |
524 | end_headers(); | |
525 | ||
526 | vsnprintf(buffer, sizeof(buffer), err, params); | |
527 | fprintf(stderr, "fatal: %s\n", buffer); | |
528 | exit(0); | |
529 | } | |
530 | ||
917adc03 ML |
531 | static char* getdir(void) |
532 | { | |
533 | struct strbuf buf = STRBUF_INIT; | |
534 | char *pathinfo = getenv("PATH_INFO"); | |
535 | char *root = getenv("GIT_PROJECT_ROOT"); | |
536 | char *path = getenv("PATH_TRANSLATED"); | |
537 | ||
538 | if (root && *root) { | |
539 | if (!pathinfo || !*pathinfo) | |
540 | die("GIT_PROJECT_ROOT is set but PATH_INFO is not"); | |
541 | strbuf_addstr(&buf, root); | |
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; | |
549 | } | |
550 | ||
2f4038ab SP |
551 | static struct service_cmd { |
552 | const char *method; | |
553 | const char *pattern; | |
554 | void (*imp)(char *); | |
555 | } services[] = { | |
556 | {"GET", "/HEAD$", get_text_file}, | |
557 | {"GET", "/info/refs$", 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$", get_pack_file}, | |
556cfa3b SP |
563 | {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.idx$", get_idx_file}, |
564 | ||
565 | {"POST", "/git-upload-pack$", service_rpc}, | |
566 | {"POST", "/git-receive-pack$", service_rpc} | |
2f4038ab SP |
567 | }; |
568 | ||
569 | int main(int argc, char **argv) | |
570 | { | |
571 | char *method = getenv("REQUEST_METHOD"); | |
917adc03 | 572 | char *dir; |
2f4038ab SP |
573 | struct service_cmd *cmd = NULL; |
574 | char *cmd_arg = NULL; | |
575 | int i; | |
576 | ||
577 | git_extract_argv0_path(argv[0]); | |
578 | set_die_routine(die_webcgi); | |
579 | ||
580 | if (!method) | |
581 | die("No REQUEST_METHOD from server"); | |
582 | if (!strcmp(method, "HEAD")) | |
583 | method = "GET"; | |
917adc03 | 584 | dir = getdir(); |
2f4038ab SP |
585 | |
586 | for (i = 0; i < ARRAY_SIZE(services); i++) { | |
587 | struct service_cmd *c = &services[i]; | |
588 | regex_t re; | |
589 | regmatch_t out[1]; | |
590 | ||
591 | if (regcomp(&re, c->pattern, REG_EXTENDED)) | |
592 | die("Bogus regex in service table: %s", c->pattern); | |
593 | if (!regexec(&re, dir, 1, out, 0)) { | |
594 | size_t n = out[0].rm_eo - out[0].rm_so; | |
595 | ||
596 | if (strcmp(method, c->method)) { | |
597 | const char *proto = getenv("SERVER_PROTOCOL"); | |
598 | if (proto && !strcmp(proto, "HTTP/1.1")) | |
599 | http_status(405, "Method Not Allowed"); | |
600 | else | |
601 | http_status(400, "Bad Request"); | |
602 | hdr_nocache(); | |
603 | end_headers(); | |
604 | return 0; | |
605 | } | |
606 | ||
607 | cmd = c; | |
608 | cmd_arg = xmalloc(n); | |
609 | strncpy(cmd_arg, dir + out[0].rm_so + 1, n); | |
610 | cmd_arg[n] = '\0'; | |
611 | dir[out[0].rm_so] = 0; | |
612 | break; | |
613 | } | |
614 | regfree(&re); | |
615 | } | |
616 | ||
617 | if (!cmd) | |
618 | not_found("Request not supported: '%s'", dir); | |
619 | ||
620 | setup_path(); | |
621 | if (!enter_repo(dir, 0)) | |
622 | not_found("Not a git repository: '%s'", dir); | |
623 | ||
624 | cmd->imp(cmd_arg); | |
625 | return 0; | |
626 | } |