http-backend: respect CONTENT_LENGTH as specified by rfc3875
[git/git.git] / http-backend.c
CommitLineData
2f4038ab 1#include "cache.h"
b2141fc1 2#include "config.h"
a80d72db 3#include "repository.h"
2f4038ab
SP
4#include "refs.h"
5#include "pkt-line.h"
6#include "object.h"
7#include "tag.h"
d807c4a0 8#include "exec-cmd.h"
556cfa3b
SP
9#include "run-command.h"
10#include "string-list.h"
638794cd 11#include "url.h"
e32a4581 12#include "argv-array.h"
0abe14f6 13#include "packfile.h"
a80d72db 14#include "object-store.h"
237ffedd 15#include "protocol.h"
2f4038ab
SP
16
17static const char content_type[] = "Content-Type";
18static const char content_length[] = "Content-Length";
19static const char last_modified[] = "Last-Modified";
5abb013b 20static int getanyfile = 1;
6bc0cb51 21static unsigned long max_request_buffer = 10 * 1024 * 1024;
2f4038ab 22
556cfa3b
SP
23static struct string_list *query_params;
24
25struct rpc_service {
26 const char *name;
27 const char *config_name;
6bc0cb51 28 unsigned buffer_input : 1;
556cfa3b
SP
29 signed enabled : 2;
30};
31
32static struct rpc_service rpc_service[] = {
6bc0cb51
JK
33 { "upload-pack", "uploadpack", 1, 1 },
34 { "receive-pack", "receivepack", 0, -1 },
556cfa3b
SP
35};
36
556cfa3b
SP
37static 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) {
638794cd
JK
44 char *name = url_decode_parameter_name(&query);
45 char *value = url_decode_parameter_value(&query);
556cfa3b
SP
46 struct string_list_item *i;
47
e8c8b713 48 i = string_list_lookup(query_params, name);
556cfa3b 49 if (!i)
78a395d3 50 i = string_list_insert(query_params, name);
556cfa3b
SP
51 else
52 free(i->util);
53 i->util = value;
54 }
55 }
56 return query_params;
57}
58
59static const char *get_parameter(const char *name)
60{
61 struct string_list_item *i;
e8c8b713 62 i = string_list_lookup(get_parameters(), name);
556cfa3b
SP
63 return i ? i->util : NULL;
64}
65
35487017 66__attribute__((format (printf, 2, 3)))
2f4038ab
SP
67static 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
cdf4fb8e 80 write_or_die(fd, buffer, n);
2f4038ab
SP
81}
82
b36045c1 83static void http_status(struct strbuf *hdr, unsigned code, const char *msg)
2f4038ab 84{
b36045c1 85 strbuf_addf(hdr, "Status: %u %s\r\n", code, msg);
2f4038ab
SP
86}
87
b36045c1 88static void hdr_str(struct strbuf *hdr, const char *name, const char *value)
2f4038ab 89{
b36045c1 90 strbuf_addf(hdr, "%s: %s\r\n", name, value);
2f4038ab
SP
91}
92
b36045c1 93static void hdr_int(struct strbuf *hdr, const char *name, uintmax_t value)
2f4038ab 94{
b36045c1 95 strbuf_addf(hdr, "%s: %" PRIuMAX "\r\n", name, value);
2f4038ab
SP
96}
97
dddbad72 98static void hdr_date(struct strbuf *hdr, const char *name, timestamp_t when)
2f4038ab 99{
a5481a6c 100 const char *value = show_date(when, 0, DATE_MODE(RFC2822));
b36045c1 101 hdr_str(hdr, name, value);
2f4038ab
SP
102}
103
b36045c1 104static void hdr_nocache(struct strbuf *hdr)
2f4038ab 105{
b36045c1
EW
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");
2f4038ab
SP
109}
110
b36045c1 111static void hdr_cache_forever(struct strbuf *hdr)
2f4038ab 112{
dddbad72 113 timestamp_t now = time(NULL);
b36045c1
EW
114 hdr_date(hdr, "Date", now);
115 hdr_date(hdr, "Expires", now + 31536000);
116 hdr_str(hdr, "Cache-Control", "public, max-age=31536000");
2f4038ab
SP
117}
118
b36045c1 119static void end_headers(struct strbuf *hdr)
2f4038ab 120{
b36045c1
EW
121 strbuf_add(hdr, "\r\n", 2);
122 write_or_die(1, hdr->buf, hdr->len);
123 strbuf_release(hdr);
2f4038ab
SP
124}
125
b36045c1
EW
126__attribute__((format (printf, 2, 3)))
127static NORETURN void not_found(struct strbuf *hdr, const char *err, ...)
2f4038ab
SP
128{
129 va_list params;
130
b36045c1
EW
131 http_status(hdr, 404, "Not Found");
132 hdr_nocache(hdr);
133 end_headers(hdr);
2f4038ab
SP
134
135 va_start(params, err);
136 if (err && *err)
137 vfprintf(stderr, err, params);
138 va_end(params);
139 exit(0);
140}
141
b36045c1
EW
142__attribute__((format (printf, 2, 3)))
143static NORETURN void forbidden(struct strbuf *hdr, const char *err, ...)
556cfa3b
SP
144{
145 va_list params;
146
b36045c1
EW
147 http_status(hdr, 403, "Forbidden");
148 hdr_nocache(hdr);
149 end_headers(hdr);
556cfa3b
SP
150
151 va_start(params, err);
152 if (err && *err)
153 vfprintf(stderr, err, params);
154 va_end(params);
155 exit(0);
156}
157
b36045c1 158static void select_getanyfile(struct strbuf *hdr)
5abb013b
SP
159{
160 if (!getanyfile)
b36045c1 161 forbidden(hdr, "Unsupported service: getanyfile");
5abb013b
SP
162}
163
b36045c1
EW
164static void send_strbuf(struct strbuf *hdr,
165 const char *type, struct strbuf *buf)
2f4038ab 166{
b36045c1
EW
167 hdr_int(hdr, content_length, buf->len);
168 hdr_str(hdr, content_type, type);
169 end_headers(hdr);
cdf4fb8e 170 write_or_die(1, buf->buf, buf->len);
2f4038ab
SP
171}
172
b36045c1
EW
173static void send_local_file(struct strbuf *hdr, const char *the_type,
174 const char *name)
2f4038ab 175{
fcd12db6 176 char *p = git_pathdup("%s", name);
2f4038ab
SP
177 size_t buf_alloc = 8192;
178 char *buf = xmalloc(buf_alloc);
179 int fd;
180 struct stat sb;
2f4038ab
SP
181
182 fd = open(p, O_RDONLY);
183 if (fd < 0)
b36045c1 184 not_found(hdr, "Cannot open '%s': %s", p, strerror(errno));
2f4038ab
SP
185 if (fstat(fd, &sb) < 0)
186 die_errno("Cannot stat '%s'", p);
187
b36045c1
EW
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);
2f4038ab 192
4a5328d6 193 for (;;) {
2f4038ab
SP
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;
cdf4fb8e 199 write_or_die(1, buf, n);
2f4038ab
SP
200 }
201 close(fd);
202 free(buf);
fcd12db6 203 free(p);
2f4038ab
SP
204}
205
b36045c1 206static void get_text_file(struct strbuf *hdr, char *name)
2f4038ab 207{
b36045c1
EW
208 select_getanyfile(hdr);
209 hdr_nocache(hdr);
210 send_local_file(hdr, "text/plain", name);
2f4038ab
SP
211}
212
b36045c1 213static void get_loose_object(struct strbuf *hdr, char *name)
2f4038ab 214{
b36045c1
EW
215 select_getanyfile(hdr);
216 hdr_cache_forever(hdr);
217 send_local_file(hdr, "application/x-git-loose-object", name);
2f4038ab
SP
218}
219
b36045c1 220static void get_pack_file(struct strbuf *hdr, char *name)
2f4038ab 221{
b36045c1
EW
222 select_getanyfile(hdr);
223 hdr_cache_forever(hdr);
224 send_local_file(hdr, "application/x-git-packed-objects", name);
2f4038ab
SP
225}
226
b36045c1 227static void get_idx_file(struct strbuf *hdr, char *name)
2f4038ab 228{
b36045c1
EW
229 select_getanyfile(hdr);
230 hdr_cache_forever(hdr);
231 send_local_file(hdr, "application/x-git-packed-objects-toc", name);
2f4038ab
SP
232}
233
6881f0cc 234static void http_config(void)
556cfa3b 235{
6881f0cc
TA
236 int i, value = 0;
237 struct strbuf var = STRBUF_INIT;
ae021d87 238
6881f0cc 239 git_config_get_bool("http.getanyfile", &getanyfile);
6bc0cb51 240 git_config_get_ulong("http.maxrequestbuffer", &max_request_buffer);
556cfa3b 241
6881f0cc
TA
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);
5abb013b
SP
248 }
249
6881f0cc 250 strbuf_release(&var);
556cfa3b
SP
251}
252
b36045c1 253static struct rpc_service *select_service(struct strbuf *hdr, const char *name)
556cfa3b 254{
ae021d87 255 const char *svc_name;
556cfa3b
SP
256 struct rpc_service *svc = NULL;
257 int i;
258
ae021d87 259 if (!skip_prefix(name, "git-", &svc_name))
b36045c1 260 forbidden(hdr, "Unsupported service: '%s'", name);
556cfa3b
SP
261
262 for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
263 struct rpc_service *s = &rpc_service[i];
ae021d87 264 if (!strcmp(s->name, svc_name)) {
556cfa3b
SP
265 svc = s;
266 break;
267 }
268 }
269
270 if (!svc)
b36045c1 271 forbidden(hdr, "Unsupported service: '%s'", name);
556cfa3b 272
556cfa3b
SP
273 if (svc->enabled < 0) {
274 const char *user = getenv("REMOTE_USER");
275 svc->enabled = (user && *user) ? 1 : 0;
276 }
277 if (!svc->enabled)
b36045c1 278 forbidden(hdr, "Service not enabled: '%s'", svc->name);
556cfa3b
SP
279 return svc;
280}
281
6b1fae1d
MK
282static 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
6bc0cb51
JK
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 */
c79edf73 293static ssize_t read_request_eof(int fd, unsigned char **out)
6bc0cb51
JK
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
c79edf73
MK
330static 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
351static ssize_t get_content_length(void)
352{
353 ssize_t val = -1;
354 const char *str = getenv("CONTENT_LENGTH");
355
356 if (str && !git_parse_ssize_t(str, &val))
357 die("failed to parse CONTENT_LENGTH: %s", str);
358 return val;
359}
360
361static 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
369static void inflate_request(const char *prog_name, int out, int buffer_input, ssize_t req_len)
556cfa3b 370{
ef49a7a0 371 git_zstream stream;
6bc0cb51 372 unsigned char *full_request = NULL;
556cfa3b
SP
373 unsigned char in_buf[8192];
374 unsigned char out_buf[8192];
375 unsigned long cnt = 0;
556cfa3b
SP
376
377 memset(&stream, 0, sizeof(stream));
5e86c1fb 378 git_inflate_init_gzip_only(&stream);
556cfa3b
SP
379
380 while (1) {
6bc0cb51
JK
381 ssize_t n;
382
383 if (buffer_input) {
384 if (full_request)
385 n = 0; /* nothing left to read */
386 else
c79edf73 387 n = read_request(0, &full_request, req_len);
6bc0cb51
JK
388 stream.next_in = full_request;
389 } else {
390 n = xread(0, in_buf, sizeof(in_buf));
391 stream.next_in = in_buf;
392 }
393
556cfa3b
SP
394 if (n <= 0)
395 die("request ended in the middle of the gzip stream");
556cfa3b
SP
396 stream.avail_in = n;
397
398 while (0 < stream.avail_in) {
399 int ret;
400
401 stream.next_out = out_buf;
402 stream.avail_out = sizeof(out_buf);
403
9e7e5ca3 404 ret = git_inflate(&stream, Z_NO_FLUSH);
556cfa3b
SP
405 if (ret != Z_OK && ret != Z_STREAM_END)
406 die("zlib error inflating request, result %d", ret);
407
408 n = stream.total_out - cnt;
6b1fae1d
MK
409 write_to_child(out, out_buf, stream.total_out - cnt, prog_name);
410 cnt = stream.total_out;
556cfa3b
SP
411
412 if (ret == Z_STREAM_END)
413 goto done;
414 }
415 }
416
417done:
9e7e5ca3 418 git_inflate_end(&stream);
556cfa3b 419 close(out);
6bc0cb51
JK
420 free(full_request);
421}
422
c79edf73 423static void copy_request(const char *prog_name, int out, ssize_t req_len)
6bc0cb51
JK
424{
425 unsigned char *buf;
c79edf73 426 ssize_t n = read_request(0, &buf, req_len);
6bc0cb51
JK
427 if (n < 0)
428 die_errno("error reading request body");
6b1fae1d 429 write_to_child(out, buf, n, prog_name);
6bc0cb51
JK
430 close(out);
431 free(buf);
556cfa3b
SP
432}
433
6bc0cb51 434static void run_service(const char **argv, int buffer_input)
556cfa3b
SP
435{
436 const char *encoding = getenv("HTTP_CONTENT_ENCODING");
437 const char *user = getenv("REMOTE_USER");
438 const char *host = getenv("REMOTE_ADDR");
556cfa3b 439 int gzipped_request = 0;
d3180279 440 struct child_process cld = CHILD_PROCESS_INIT;
c79edf73 441 ssize_t req_len = get_content_length();
556cfa3b
SP
442
443 if (encoding && !strcmp(encoding, "gzip"))
444 gzipped_request = 1;
445 else if (encoding && !strcmp(encoding, "x-gzip"))
446 gzipped_request = 1;
447
448 if (!user || !*user)
449 user = "anonymous";
450 if (!host || !*host)
451 host = "(none)";
452
e32a4581 453 if (!getenv("GIT_COMMITTER_NAME"))
a9154590 454 argv_array_pushf(&cld.env_array, "GIT_COMMITTER_NAME=%s", user);
e32a4581 455 if (!getenv("GIT_COMMITTER_EMAIL"))
a9154590
RS
456 argv_array_pushf(&cld.env_array,
457 "GIT_COMMITTER_EMAIL=%s@http.%s", user, host);
556cfa3b 458
556cfa3b 459 cld.argv = argv;
6bc0cb51 460 if (buffer_input || gzipped_request)
556cfa3b
SP
461 cld.in = -1;
462 cld.git_cmd = 1;
463 if (start_command(&cld))
464 exit(1);
465
466 close(1);
467 if (gzipped_request)
c79edf73 468 inflate_request(argv[0], cld.in, buffer_input, req_len);
6bc0cb51 469 else if (buffer_input)
c79edf73 470 copy_request(argv[0], cld.in, req_len);
556cfa3b
SP
471 else
472 close(0);
473
474 if (finish_command(&cld))
475 exit(1);
556cfa3b
SP
476}
477
f72f5421
MH
478static int show_text_ref(const char *name, const struct object_id *oid,
479 int flag, void *cb_data)
2f4038ab 480{
6130f86d 481 const char *name_nons = strip_namespace(name);
2f4038ab 482 struct strbuf *buf = cb_data;
c251c83d 483 struct object *o = parse_object(oid);
2f4038ab
SP
484 if (!o)
485 return 0;
486
f72f5421 487 strbuf_addf(buf, "%s\t%s\n", oid_to_hex(oid), name_nons);
2f4038ab
SP
488 if (o->type == OBJ_TAG) {
489 o = deref_tag(o, name, 0);
490 if (!o)
491 return 0;
f2fd0760 492 strbuf_addf(buf, "%s\t%s^{}\n", oid_to_hex(&o->oid),
6130f86d 493 name_nons);
2f4038ab
SP
494 }
495 return 0;
496}
497
b36045c1 498static void get_info_refs(struct strbuf *hdr, char *arg)
2f4038ab 499{
556cfa3b 500 const char *service_name = get_parameter("service");
2f4038ab
SP
501 struct strbuf buf = STRBUF_INIT;
502
b36045c1 503 hdr_nocache(hdr);
556cfa3b
SP
504
505 if (service_name) {
506 const char *argv[] = {NULL /* service name */,
507 "--stateless-rpc", "--advertise-refs",
508 ".", NULL};
b36045c1 509 struct rpc_service *svc = select_service(hdr, service_name);
556cfa3b
SP
510
511 strbuf_addf(&buf, "application/x-git-%s-advertisement",
512 svc->name);
b36045c1
EW
513 hdr_str(hdr, content_type, buf.buf);
514 end_headers(hdr);
556cfa3b 515
237ffedd
BW
516
517 if (determine_protocol_version_server() != protocol_v2) {
518 packet_write_fmt(1, "# service=git-%s\n", svc->name);
519 packet_flush(1);
520 }
556cfa3b
SP
521
522 argv[0] = svc->name;
6bc0cb51 523 run_service(argv, 0);
556cfa3b
SP
524
525 } else {
b36045c1 526 select_getanyfile(hdr);
6130f86d 527 for_each_namespaced_ref(show_text_ref, &buf);
b36045c1 528 send_strbuf(hdr, "text/plain", &buf);
556cfa3b 529 }
2f4038ab
SP
530 strbuf_release(&buf);
531}
532
f72f5421
MH
533static int show_head_ref(const char *refname, const struct object_id *oid,
534 int flag, void *cb_data)
6130f86d
JK
535{
536 struct strbuf *buf = cb_data;
537
538 if (flag & REF_ISSYMREF) {
7695d118
RS
539 const char *target = resolve_ref_unsafe(refname,
540 RESOLVE_REF_READING,
744c040b 541 NULL, NULL);
6130f86d 542
7fd12bfb
MH
543 if (target)
544 strbuf_addf(buf, "ref: %s\n", strip_namespace(target));
6130f86d 545 } else {
f72f5421 546 strbuf_addf(buf, "%s\n", oid_to_hex(oid));
6130f86d
JK
547 }
548
549 return 0;
550}
551
b36045c1 552static void get_head(struct strbuf *hdr, char *arg)
6130f86d
JK
553{
554 struct strbuf buf = STRBUF_INIT;
555
b36045c1 556 select_getanyfile(hdr);
6130f86d 557 head_ref_namespaced(show_head_ref, &buf);
b36045c1 558 send_strbuf(hdr, "text/plain", &buf);
6130f86d
JK
559 strbuf_release(&buf);
560}
561
b36045c1 562static void get_info_packs(struct strbuf *hdr, char *arg)
2f4038ab
SP
563{
564 size_t objdirlen = strlen(get_object_directory());
565 struct strbuf buf = STRBUF_INIT;
566 struct packed_git *p;
567 size_t cnt = 0;
568
b36045c1 569 select_getanyfile(hdr);
a80d72db 570 for (p = get_packed_git(the_repository); p; p = p->next) {
2f4038ab
SP
571 if (p->pack_local)
572 cnt++;
573 }
574
575 strbuf_grow(&buf, cnt * 53 + 2);
a80d72db 576 for (p = get_packed_git(the_repository); p; p = p->next) {
2f4038ab
SP
577 if (p->pack_local)
578 strbuf_addf(&buf, "P %s\n", p->pack_name + objdirlen + 6);
579 }
580 strbuf_addch(&buf, '\n');
581
b36045c1
EW
582 hdr_nocache(hdr);
583 send_strbuf(hdr, "text/plain; charset=utf-8", &buf);
2f4038ab
SP
584 strbuf_release(&buf);
585}
586
b36045c1 587static void check_content_type(struct strbuf *hdr, const char *accepted_type)
556cfa3b
SP
588{
589 const char *actual_type = getenv("CONTENT_TYPE");
590
591 if (!actual_type)
592 actual_type = "";
593
594 if (strcmp(actual_type, accepted_type)) {
b36045c1
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595 http_status(hdr, 415, "Unsupported Media Type");
596 hdr_nocache(hdr);
597 end_headers(hdr);
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598 format_write(1,
599 "Expected POST with Content-Type '%s',"
600 " but received '%s' instead.\n",
601 accepted_type, actual_type);
602 exit(0);
603 }
604}
605
b36045c1 606static void service_rpc(struct strbuf *hdr, char *service_name)
556cfa3b
SP
607{
608 const char *argv[] = {NULL, "--stateless-rpc", ".", NULL};
b36045c1 609 struct rpc_service *svc = select_service(hdr, service_name);
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610 struct strbuf buf = STRBUF_INIT;
611
612 strbuf_reset(&buf);
613 strbuf_addf(&buf, "application/x-git-%s-request", svc->name);
b36045c1 614 check_content_type(hdr, buf.buf);
556cfa3b 615
b36045c1 616 hdr_nocache(hdr);
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617
618 strbuf_reset(&buf);
619 strbuf_addf(&buf, "application/x-git-%s-result", svc->name);
b36045c1 620 hdr_str(hdr, content_type, buf.buf);
556cfa3b 621
b36045c1 622 end_headers(hdr);
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623
624 argv[0] = svc->name;
6bc0cb51 625 run_service(argv, svc->buffer_input);
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626 strbuf_release(&buf);
627}
628
7253a023 629static int dead;
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630static NORETURN void die_webcgi(const char *err, va_list params)
631{
7253a023 632 if (dead <= 1) {
b36045c1
EW
633 struct strbuf hdr = STRBUF_INIT;
634
7253a023 635 vreportf("fatal: ", err, params);
2f4038ab 636
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637 http_status(&hdr, 500, "Internal Server Error");
638 hdr_nocache(&hdr);
639 end_headers(&hdr);
5856b5f5
SP
640 }
641 exit(0); /* we successfully reported a failure ;-) */
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642}
643
7253a023
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644static int die_webcgi_recursing(void)
645{
646 return dead++ > 1;
647}
648
917adc03
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649static char* getdir(void)
650{
651 struct strbuf buf = STRBUF_INIT;
652 char *pathinfo = getenv("PATH_INFO");
653 char *root = getenv("GIT_PROJECT_ROOT");
654 char *path = getenv("PATH_TRANSLATED");
655
656 if (root && *root) {
657 if (!pathinfo || !*pathinfo)
658 die("GIT_PROJECT_ROOT is set but PATH_INFO is not");
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659 if (daemon_avoid_alias(pathinfo))
660 die("'%s': aliased", pathinfo);
cf688cc2 661 end_url_with_slash(&buf, root);
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662 if (pathinfo[0] == '/')
663 pathinfo++;
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664 strbuf_addstr(&buf, pathinfo);
665 return strbuf_detach(&buf, NULL);
666 } else if (path && *path) {
667 return xstrdup(path);
668 } else
669 die("No GIT_PROJECT_ROOT or PATH_TRANSLATED from server");
670 return NULL;
671}
672
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673static struct service_cmd {
674 const char *method;
675 const char *pattern;
b36045c1 676 void (*imp)(struct strbuf *, char *);
2f4038ab 677} services[] = {
6130f86d 678 {"GET", "/HEAD$", get_head},
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679 {"GET", "/info/refs$", get_info_refs},
680 {"GET", "/objects/info/alternates$", get_text_file},
681 {"GET", "/objects/info/http-alternates$", get_text_file},
682 {"GET", "/objects/info/packs$", get_info_packs},
683 {"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{38}$", get_loose_object},
684 {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.pack$", get_pack_file},
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SP
685 {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.idx$", get_idx_file},
686
687 {"POST", "/git-upload-pack$", service_rpc},
688 {"POST", "/git-receive-pack$", service_rpc}
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689};
690
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691static int bad_request(struct strbuf *hdr, const struct service_cmd *c)
692{
693 const char *proto = getenv("SERVER_PROTOCOL");
694
695 if (proto && !strcmp(proto, "HTTP/1.1")) {
696 http_status(hdr, 405, "Method Not Allowed");
697 hdr_str(hdr, "Allow",
698 !strcmp(c->method, "GET") ? "GET, HEAD" : c->method);
699 } else
700 http_status(hdr, 400, "Bad Request");
701 hdr_nocache(hdr);
702 end_headers(hdr);
703 return 0;
704}
705
3f2e2297 706int cmd_main(int argc, const char **argv)
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SP
707{
708 char *method = getenv("REQUEST_METHOD");
917adc03 709 char *dir;
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SP
710 struct service_cmd *cmd = NULL;
711 char *cmd_arg = NULL;
712 int i;
b36045c1 713 struct strbuf hdr = STRBUF_INIT;
2f4038ab 714
2f4038ab 715 set_die_routine(die_webcgi);
7253a023 716 set_die_is_recursing_routine(die_webcgi_recursing);
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717
718 if (!method)
719 die("No REQUEST_METHOD from server");
720 if (!strcmp(method, "HEAD"))
721 method = "GET";
917adc03 722 dir = getdir();
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723
724 for (i = 0; i < ARRAY_SIZE(services); i++) {
725 struct service_cmd *c = &services[i];
726 regex_t re;
727 regmatch_t out[1];
728
729 if (regcomp(&re, c->pattern, REG_EXTENDED))
730 die("Bogus regex in service table: %s", c->pattern);
731 if (!regexec(&re, dir, 1, out, 0)) {
48aec1b1 732 size_t n;
2f4038ab 733
b36045c1
EW
734 if (strcmp(method, c->method))
735 return bad_request(&hdr, c);
2f4038ab
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736
737 cmd = c;
48aec1b1 738 n = out[0].rm_eo - out[0].rm_so;
5c0b13f8 739 cmd_arg = xmemdupz(dir + out[0].rm_so + 1, n - 1);
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SP
740 dir[out[0].rm_so] = 0;
741 break;
742 }
743 regfree(&re);
744 }
745
746 if (!cmd)
b36045c1 747 not_found(&hdr, "Request not supported: '%s'", dir);
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748
749 setup_path();
750 if (!enter_repo(dir, 0))
b36045c1 751 not_found(&hdr, "Not a git repository: '%s'", dir);
8b2bd7cd
TC
752 if (!getenv("GIT_HTTP_EXPORT_ALL") &&
753 access("git-daemon-export-ok", F_OK) )
b36045c1 754 not_found(&hdr, "Repository not exported: '%s'", dir);
2f4038ab 755
6881f0cc 756 http_config();
6bc0cb51
JK
757 max_request_buffer = git_env_ulong("GIT_HTTP_MAX_REQUEST_BUFFER",
758 max_request_buffer);
759
b36045c1 760 cmd->imp(&hdr, cmd_arg);
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761 return 0;
762}