git

1
#define USE_THE_REPOSITORY_VARIABLE
2

3
#include "git-compat-util.h"
4
#include "config.h"
5
#include "environment.h"
6
#include "git-zlib.h"
7
#include "hex.h"
8
#include "path.h"
9
#include "repository.h"
10
#include "refs.h"
11
#include "pkt-line.h"
12
#include "object.h"
13
#include "tag.h"
14
#include "exec-cmd.h"
15
#include "run-command.h"
16
#include "string-list.h"
17
#include "url.h"
18
#include "strvec.h"
19
#include "packfile.h"
20
#include "object-store-ll.h"
21
#include "protocol.h"
22
#include "date.h"
23
#include "write-or-die.h"
24

25
static const char content_type[] = "Content-Type";
26
static const char content_length[] = "Content-Length";
27
static const char last_modified[] = "Last-Modified";
28
static int getanyfile = 1;
29
static unsigned long max_request_buffer = 10 * 1024 * 1024;
30

31
static struct string_list *query_params;
32

33
struct rpc_service {
34
	const char *name;
35
	const char *config_name;
36
	unsigned buffer_input : 1;
37
	signed enabled : 2;
38
};
39

40
static struct rpc_service rpc_service[] = {
41
	{ "upload-pack", "uploadpack", 1, 1 },
42
	{ "receive-pack", "receivepack", 0, -1 },
43
	{ "upload-archive", "uploadarchive", 0, -1 },
44
};
45

46
static struct string_list *get_parameters(void)
47
{
48
	if (!query_params) {
49
		const char *query = getenv("QUERY_STRING");
50

51
		CALLOC_ARRAY(query_params, 1);
52
		while (query && *query) {
53
			char *name = url_decode_parameter_name(&query);
54
			char *value = url_decode_parameter_value(&query);
55
			struct string_list_item *i;
56

57
			i = string_list_lookup(query_params, name);
58
			if (!i)
59
				i = string_list_insert(query_params, name);
60
			else
61
				free(i->util);
62
			i->util = value;
63
		}
64
	}
65
	return query_params;
66
}
67

68
static const char *get_parameter(const char *name)
69
{
70
	struct string_list_item *i;
71
	i = string_list_lookup(get_parameters(), name);
72
	return i ? i->util : NULL;
73
}
74

75
__attribute__((format (printf, 2, 3)))
76
static void format_write(int fd, const char *fmt, ...)
77
{
78
	static char buffer[1024];
79

80
	va_list args;
81
	unsigned n;
82

83
	va_start(args, fmt);
84
	n = vsnprintf(buffer, sizeof(buffer), fmt, args);
85
	va_end(args);
86
	if (n >= sizeof(buffer))
87
		die("protocol error: impossibly long line");
88

89
	write_or_die(fd, buffer, n);
90
}
91

92
static void http_status(struct strbuf *hdr, unsigned code, const char *msg)
93
{
94
	strbuf_addf(hdr, "Status: %u %s\r\n", code, msg);
95
}
96

97
static void hdr_str(struct strbuf *hdr, const char *name, const char *value)
98
{
99
	strbuf_addf(hdr, "%s: %s\r\n", name, value);
100
}
101

102
static void hdr_int(struct strbuf *hdr, const char *name, uintmax_t value)
103
{
104
	strbuf_addf(hdr, "%s: %" PRIuMAX "\r\n", name, value);
105
}
106

107
static void hdr_date(struct strbuf *hdr, const char *name, timestamp_t when)
108
{
109
	const char *value = show_date(when, 0, DATE_MODE(RFC2822));
110
	hdr_str(hdr, name, value);
111
}
112

113
static void hdr_nocache(struct strbuf *hdr)
114
{
115
	hdr_str(hdr, "Expires", "Fri, 01 Jan 1980 00:00:00 GMT");
116
	hdr_str(hdr, "Pragma", "no-cache");
117
	hdr_str(hdr, "Cache-Control", "no-cache, max-age=0, must-revalidate");
118
}
119

120
static void hdr_cache_forever(struct strbuf *hdr)
121
{
122
	timestamp_t now = time(NULL);
123
	hdr_date(hdr, "Date", now);
124
	hdr_date(hdr, "Expires", now + 31536000);
125
	hdr_str(hdr, "Cache-Control", "public, max-age=31536000");
126
}
127

128
static void end_headers(struct strbuf *hdr)
129
{
130
	strbuf_add(hdr, "\r\n", 2);
131
	write_or_die(1, hdr->buf, hdr->len);
132
	strbuf_release(hdr);
133
}
134

135
__attribute__((format (printf, 2, 3)))
136
static NORETURN void not_found(struct strbuf *hdr, const char *err, ...)
137
{
138
	va_list params;
139

140
	http_status(hdr, 404, "Not Found");
141
	hdr_nocache(hdr);
142
	end_headers(hdr);
143

144
	va_start(params, err);
145
	if (err && *err)
146
		vfprintf(stderr, err, params);
147
	va_end(params);
148
	exit(0);
149
}
150

151
__attribute__((format (printf, 2, 3)))
152
static NORETURN void forbidden(struct strbuf *hdr, const char *err, ...)
153
{
154
	va_list params;
155

156
	http_status(hdr, 403, "Forbidden");
157
	hdr_nocache(hdr);
158
	end_headers(hdr);
159

160
	va_start(params, err);
161
	if (err && *err)
162
		vfprintf(stderr, err, params);
163
	va_end(params);
164
	exit(0);
165
}
166

167
static void select_getanyfile(struct strbuf *hdr)
168
{
169
	if (!getanyfile)
170
		forbidden(hdr, "Unsupported service: getanyfile");
171
}
172

173
static void send_strbuf(struct strbuf *hdr,
174
			const char *type, struct strbuf *buf)
175
{
176
	hdr_int(hdr, content_length, buf->len);
177
	hdr_str(hdr, content_type, type);
178
	end_headers(hdr);
179
	write_or_die(1, buf->buf, buf->len);
180
}
181

182
static void send_local_file(struct strbuf *hdr, const char *the_type,
183
				const char *name)
184
{
185
	char *p = git_pathdup("%s", name);
186
	size_t buf_alloc = 8192;
187
	char *buf = xmalloc(buf_alloc);
188
	int fd;
189
	struct stat sb;
190

191
	fd = open(p, O_RDONLY);
192
	if (fd < 0)
193
		not_found(hdr, "Cannot open '%s': %s", p, strerror(errno));
194
	if (fstat(fd, &sb) < 0)
195
		die_errno("Cannot stat '%s'", p);
196

197
	hdr_int(hdr, content_length, sb.st_size);
198
	hdr_str(hdr, content_type, the_type);
199
	hdr_date(hdr, last_modified, sb.st_mtime);
200
	end_headers(hdr);
201

202
	for (;;) {
203
		ssize_t n = xread(fd, buf, buf_alloc);
204
		if (n < 0)
205
			die_errno("Cannot read '%s'", p);
206
		if (!n)
207
			break;
208
		write_or_die(1, buf, n);
209
	}
210
	close(fd);
211
	free(buf);
212
	free(p);
213
}
214

215
static void get_text_file(struct strbuf *hdr, char *name)
216
{
217
	select_getanyfile(hdr);
218
	hdr_nocache(hdr);
219
	send_local_file(hdr, "text/plain", name);
220
}
221

222
static void get_loose_object(struct strbuf *hdr, char *name)
223
{
224
	select_getanyfile(hdr);
225
	hdr_cache_forever(hdr);
226
	send_local_file(hdr, "application/x-git-loose-object", name);
227
}
228

229
static void get_pack_file(struct strbuf *hdr, char *name)
230
{
231
	select_getanyfile(hdr);
232
	hdr_cache_forever(hdr);
233
	send_local_file(hdr, "application/x-git-packed-objects", name);
234
}
235

236
static void get_idx_file(struct strbuf *hdr, char *name)
237
{
238
	select_getanyfile(hdr);
239
	hdr_cache_forever(hdr);
240
	send_local_file(hdr, "application/x-git-packed-objects-toc", name);
241
}
242

243
static void http_config(void)
244
{
245
	int i, value = 0;
246
	struct strbuf var = STRBUF_INIT;
247

248
	git_config_get_bool("http.getanyfile", &getanyfile);
249
	git_config_get_ulong("http.maxrequestbuffer", &max_request_buffer);
250

251
	for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
252
		struct rpc_service *svc = &rpc_service[i];
253
		strbuf_addf(&var, "http.%s", svc->config_name);
254
		if (!git_config_get_bool(var.buf, &value))
255
			svc->enabled = value;
256
		strbuf_reset(&var);
257
	}
258

259
	strbuf_release(&var);
260
}
261

262
static struct rpc_service *select_service(struct strbuf *hdr, const char *name)
263
{
264
	const char *svc_name;
265
	struct rpc_service *svc = NULL;
266
	int i;
267

268
	if (!skip_prefix(name, "git-", &svc_name))
269
		forbidden(hdr, "Unsupported service: '%s'", name);
270

271
	for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
272
		struct rpc_service *s = &rpc_service[i];
273
		if (!strcmp(s->name, svc_name)) {
274
			svc = s;
275
			break;
276
		}
277
	}
278

279
	if (!svc)
280
		forbidden(hdr, "Unsupported service: '%s'", name);
281

282
	if (svc->enabled < 0) {
283
		const char *user = getenv("REMOTE_USER");
284
		svc->enabled = (user && *user) ? 1 : 0;
285
	}
286
	if (!svc->enabled)
287
		forbidden(hdr, "Service not enabled: '%s'", svc->name);
288
	return svc;
289
}
290

291
static void write_to_child(int out, const unsigned char *buf, ssize_t len, const char *prog_name)
292
{
293
	if (write_in_full(out, buf, len) < 0)
294
		die("unable to write to '%s'", prog_name);
295
}
296

297
/*
298
 * This is basically strbuf_read(), except that if we
299
 * hit max_request_buffer we die (we'd rather reject a
300
 * maliciously large request than chew up infinite memory).
301
 */
302
static ssize_t read_request_eof(int fd, unsigned char **out)
303
{
304
	size_t len = 0, alloc = 8192;
305
	unsigned char *buf = xmalloc(alloc);
306

307
	if (max_request_buffer < alloc)
308
		max_request_buffer = alloc;
309

310
	while (1) {
311
		ssize_t cnt;
312

313
		cnt = read_in_full(fd, buf + len, alloc - len);
314
		if (cnt < 0) {
315
			free(buf);
316
			return -1;
317
		}
318

319
		/* partial read from read_in_full means we hit EOF */
320
		len += cnt;
321
		if (len < alloc) {
322
			*out = buf;
323
			return len;
324
		}
325

326
		/* otherwise, grow and try again (if we can) */
327
		if (alloc == max_request_buffer)
328
			die("request was larger than our maximum size (%lu);"
329
			    " try setting GIT_HTTP_MAX_REQUEST_BUFFER",
330
			    max_request_buffer);
331

332
		alloc = alloc_nr(alloc);
333
		if (alloc > max_request_buffer)
334
			alloc = max_request_buffer;
335
		REALLOC_ARRAY(buf, alloc);
336
	}
337
}
338

339
static ssize_t read_request_fixed_len(int fd, ssize_t req_len, unsigned char **out)
340
{
341
	unsigned char *buf = NULL;
342
	ssize_t cnt = 0;
343

344
	if (max_request_buffer < req_len) {
345
		die("request was larger than our maximum size (%lu): "
346
		    "%" PRIuMAX "; try setting GIT_HTTP_MAX_REQUEST_BUFFER",
347
		    max_request_buffer, (uintmax_t)req_len);
348
	}
349

350
	buf = xmalloc(req_len);
351
	cnt = read_in_full(fd, buf, req_len);
352
	if (cnt < 0) {
353
		free(buf);
354
		return -1;
355
	}
356
	*out = buf;
357
	return cnt;
358
}
359

360
static ssize_t get_content_length(void)
361
{
362
	ssize_t val = -1;
363
	const char *str = getenv("CONTENT_LENGTH");
364

365
	if (str && *str && !git_parse_ssize_t(str, &val))
366
		die("failed to parse CONTENT_LENGTH: %s", str);
367
	return val;
368
}
369

370
static ssize_t read_request(int fd, unsigned char **out, ssize_t req_len)
371
{
372
	if (req_len < 0)
373
		return read_request_eof(fd, out);
374
	else
375
		return read_request_fixed_len(fd, req_len, out);
376
}
377

378
static void inflate_request(const char *prog_name, int out, int buffer_input, ssize_t req_len)
379
{
380
	git_zstream stream;
381
	unsigned char *full_request = NULL;
382
	unsigned char in_buf[8192];
383
	unsigned char out_buf[8192];
384
	unsigned long cnt = 0;
385
	int req_len_defined = req_len >= 0;
386
	size_t req_remaining_len = req_len;
387

388
	memset(&stream, 0, sizeof(stream));
389
	git_inflate_init_gzip_only(&stream);
390

391
	while (1) {
392
		ssize_t n;
393

394
		if (buffer_input) {
395
			if (full_request)
396
				n = 0; /* nothing left to read */
397
			else
398
				n = read_request(0, &full_request, req_len);
399
			stream.next_in = full_request;
400
		} else {
401
			ssize_t buffer_len;
402
			if (req_len_defined && req_remaining_len <= sizeof(in_buf))
403
				buffer_len = req_remaining_len;
404
			else
405
				buffer_len = sizeof(in_buf);
406
			n = xread(0, in_buf, buffer_len);
407
			stream.next_in = in_buf;
408
			if (req_len_defined && n > 0)
409
				req_remaining_len -= n;
410
		}
411

412
		if (n <= 0)
413
			die("request ended in the middle of the gzip stream");
414
		stream.avail_in = n;
415

416
		while (0 < stream.avail_in) {
417
			int ret;
418

419
			stream.next_out = out_buf;
420
			stream.avail_out = sizeof(out_buf);
421

422
			ret = git_inflate(&stream, Z_NO_FLUSH);
423
			if (ret != Z_OK && ret != Z_STREAM_END)
424
				die("zlib error inflating request, result %d", ret);
425

426
			n = stream.total_out - cnt;
427
			write_to_child(out, out_buf, stream.total_out - cnt, prog_name);
428
			cnt = stream.total_out;
429

430
			if (ret == Z_STREAM_END)
431
				goto done;
432
		}
433
	}
434

435
done:
436
	git_inflate_end(&stream);
437
	close(out);
438
	free(full_request);
439
}
440

441
static void copy_request(const char *prog_name, int out, ssize_t req_len)
442
{
443
	unsigned char *buf;
444
	ssize_t n = read_request(0, &buf, req_len);
445
	if (n < 0)
446
		die_errno("error reading request body");
447
	write_to_child(out, buf, n, prog_name);
448
	close(out);
449
	free(buf);
450
}
451

452
static void pipe_fixed_length(const char *prog_name, int out, size_t req_len)
453
{
454
	unsigned char buf[8192];
455
	size_t remaining_len = req_len;
456

457
	while (remaining_len > 0) {
458
		size_t chunk_length = remaining_len > sizeof(buf) ? sizeof(buf) : remaining_len;
459
		ssize_t n = xread(0, buf, chunk_length);
460
		if (n < 0)
461
			die_errno("Reading request failed");
462
		write_to_child(out, buf, n, prog_name);
463
		remaining_len -= n;
464
	}
465

466
	close(out);
467
}
468

469
static void run_service(const char **argv, int buffer_input)
470
{
471
	const char *encoding = getenv("HTTP_CONTENT_ENCODING");
472
	const char *user = getenv("REMOTE_USER");
473
	const char *host = getenv("REMOTE_ADDR");
474
	int gzipped_request = 0;
475
	struct child_process cld = CHILD_PROCESS_INIT;
476
	ssize_t req_len = get_content_length();
477

478
	if (encoding && (!strcmp(encoding, "gzip") || !strcmp(encoding, "x-gzip")))
479
		gzipped_request = 1;
480

481
	if (!user || !*user)
482
		user = "anonymous";
483
	if (!host || !*host)
484
		host = "(none)";
485

486
	if (!getenv("GIT_COMMITTER_NAME"))
487
		strvec_pushf(&cld.env, "GIT_COMMITTER_NAME=%s", user);
488
	if (!getenv("GIT_COMMITTER_EMAIL"))
489
		strvec_pushf(&cld.env,
490
			     "GIT_COMMITTER_EMAIL=%s@http.%s", user, host);
491

492
	strvec_pushv(&cld.args, argv);
493
	if (buffer_input || gzipped_request || req_len >= 0)
494
		cld.in = -1;
495
	cld.git_cmd = 1;
496
	cld.clean_on_exit = 1;
497
	cld.wait_after_clean = 1;
498
	if (start_command(&cld))
499
		exit(1);
500

501
	close(1);
502
	if (gzipped_request)
503
		inflate_request(argv[0], cld.in, buffer_input, req_len);
504
	else if (buffer_input)
505
		copy_request(argv[0], cld.in, req_len);
506
	else if (req_len >= 0)
507
		pipe_fixed_length(argv[0], cld.in, req_len);
508
	else
509
		close(0);
510

511
	if (finish_command(&cld))
512
		exit(1);
513
}
514

515
static int show_text_ref(const char *name, const char *referent UNUSED, const struct object_id *oid,
516
			 int flag UNUSED, void *cb_data)
517
{
518
	const char *name_nons = strip_namespace(name);
519
	struct strbuf *buf = cb_data;
520
	struct object *o = parse_object(the_repository, oid);
521
	if (!o)
522
		return 0;
523

524
	strbuf_addf(buf, "%s\t%s\n", oid_to_hex(oid), name_nons);
525
	if (o->type == OBJ_TAG) {
526
		o = deref_tag(the_repository, o, name, 0);
527
		if (!o)
528
			return 0;
529
		strbuf_addf(buf, "%s\t%s^{}\n", oid_to_hex(&o->oid),
530
			    name_nons);
531
	}
532
	return 0;
533
}
534

535
static void get_info_refs(struct strbuf *hdr, char *arg UNUSED)
536
{
537
	const char *service_name = get_parameter("service");
538
	struct strbuf buf = STRBUF_INIT;
539

540
	hdr_nocache(hdr);
541

542
	if (service_name) {
543
		const char *argv[] = {NULL /* service name */,
544
			"--http-backend-info-refs",
545
			".", NULL};
546
		struct rpc_service *svc = select_service(hdr, service_name);
547

548
		strbuf_addf(&buf, "application/x-git-%s-advertisement",
549
			svc->name);
550
		hdr_str(hdr, content_type, buf.buf);
551
		end_headers(hdr);
552

553

554
		if (determine_protocol_version_server() != protocol_v2) {
555
			packet_write_fmt(1, "# service=git-%s\n", svc->name);
556
			packet_flush(1);
557
		}
558

559
		argv[0] = svc->name;
560
		run_service(argv, 0);
561

562
	} else {
563
		select_getanyfile(hdr);
564
		refs_for_each_namespaced_ref(get_main_ref_store(the_repository),
565
					     NULL, show_text_ref, &buf);
566
		send_strbuf(hdr, "text/plain", &buf);
567
	}
568
	strbuf_release(&buf);
569
}
570

571
static int show_head_ref(const char *refname, const char *referent UNUSED, const struct object_id *oid,
572
			 int flag, void *cb_data)
573
{
574
	struct strbuf *buf = cb_data;
575

576
	if (flag & REF_ISSYMREF) {
577
		const char *target = refs_resolve_ref_unsafe(get_main_ref_store(the_repository),
578
							     refname,
579
							     RESOLVE_REF_READING,
580
							     NULL, NULL);
581

582
		if (target)
583
			strbuf_addf(buf, "ref: %s\n", strip_namespace(target));
584
	} else {
585
		strbuf_addf(buf, "%s\n", oid_to_hex(oid));
586
	}
587

588
	return 0;
589
}
590

591
static void get_head(struct strbuf *hdr, char *arg UNUSED)
592
{
593
	struct strbuf buf = STRBUF_INIT;
594

595
	select_getanyfile(hdr);
596
	refs_head_ref_namespaced(get_main_ref_store(the_repository),
597
				 show_head_ref, &buf);
598
	send_strbuf(hdr, "text/plain", &buf);
599
	strbuf_release(&buf);
600
}
601

602
static void get_info_packs(struct strbuf *hdr, char *arg UNUSED)
603
{
604
	size_t objdirlen = strlen(get_object_directory());
605
	struct strbuf buf = STRBUF_INIT;
606
	struct packed_git *p;
607
	size_t cnt = 0;
608

609
	select_getanyfile(hdr);
610
	for (p = get_all_packs(the_repository); p; p = p->next) {
611
		if (p->pack_local)
612
			cnt++;
613
	}
614

615
	strbuf_grow(&buf, cnt * 53 + 2);
616
	for (p = get_all_packs(the_repository); p; p = p->next) {
617
		if (p->pack_local)
618
			strbuf_addf(&buf, "P %s\n", p->pack_name + objdirlen + 6);
619
	}
620
	strbuf_addch(&buf, '\n');
621

622
	hdr_nocache(hdr);
623
	send_strbuf(hdr, "text/plain; charset=utf-8", &buf);
624
	strbuf_release(&buf);
625
}
626

627
static void check_content_type(struct strbuf *hdr, const char *accepted_type)
628
{
629
	const char *actual_type = getenv("CONTENT_TYPE");
630

631
	if (!actual_type)
632
		actual_type = "";
633

634
	if (strcmp(actual_type, accepted_type)) {
635
		http_status(hdr, 415, "Unsupported Media Type");
636
		hdr_nocache(hdr);
637
		end_headers(hdr);
638
		format_write(1,
639
			"Expected POST with Content-Type '%s',"
640
			" but received '%s' instead.\n",
641
			accepted_type, actual_type);
642
		exit(0);
643
	}
644
}
645

646
static void service_rpc(struct strbuf *hdr, char *service_name)
647
{
648
	struct strvec argv = STRVEC_INIT;
649
	struct rpc_service *svc = select_service(hdr, service_name);
650
	struct strbuf buf = STRBUF_INIT;
651

652
	strvec_push(&argv, svc->name);
653
	if (strcmp(service_name, "git-upload-archive"))
654
		strvec_push(&argv, "--stateless-rpc");
655
	strvec_push(&argv, ".");
656

657
	strbuf_reset(&buf);
658
	strbuf_addf(&buf, "application/x-git-%s-request", svc->name);
659
	check_content_type(hdr, buf.buf);
660

661
	hdr_nocache(hdr);
662

663
	strbuf_reset(&buf);
664
	strbuf_addf(&buf, "application/x-git-%s-result", svc->name);
665
	hdr_str(hdr, content_type, buf.buf);
666

667
	end_headers(hdr);
668

669
	run_service(argv.v, svc->buffer_input);
670
	strbuf_release(&buf);
671
	strvec_clear(&argv);
672
}
673

674
static int dead;
675
static NORETURN void die_webcgi(const char *err, va_list params)
676
{
677
	if (dead <= 1) {
678
		struct strbuf hdr = STRBUF_INIT;
679
		report_fn die_message_fn = get_die_message_routine();
680

681
		die_message_fn(err, params);
682

683
		http_status(&hdr, 500, "Internal Server Error");
684
		hdr_nocache(&hdr);
685
		end_headers(&hdr);
686
	}
687
	exit(0); /* we successfully reported a failure ;-) */
688
}
689

690
static int die_webcgi_recursing(void)
691
{
692
	return dead++ > 1;
693
}
694

695
static char* getdir(void)
696
{
697
	struct strbuf buf = STRBUF_INIT;
698
	char *pathinfo = getenv("PATH_INFO");
699
	char *root = getenv("GIT_PROJECT_ROOT");
700
	char *path = getenv("PATH_TRANSLATED");
701

702
	if (root && *root) {
703
		if (!pathinfo || !*pathinfo)
704
			die("GIT_PROJECT_ROOT is set but PATH_INFO is not");
705
		if (daemon_avoid_alias(pathinfo))
706
			die("'%s': aliased", pathinfo);
707
		end_url_with_slash(&buf, root);
708
		if (pathinfo[0] == '/')
709
			pathinfo++;
710
		strbuf_addstr(&buf, pathinfo);
711
		return strbuf_detach(&buf, NULL);
712
	} else if (path && *path) {
713
		return xstrdup(path);
714
	} else
715
		die("No GIT_PROJECT_ROOT or PATH_TRANSLATED from server");
716
	return NULL;
717
}
718

719
static struct service_cmd {
720
	const char *method;
721
	const char *pattern;
722
	void (*imp)(struct strbuf *, char *);
723
} services[] = {
724
	{"GET", "/HEAD$", get_head},
725
	{"GET", "/info/refs$", get_info_refs},
726
	{"GET", "/objects/info/alternates$", get_text_file},
727
	{"GET", "/objects/info/http-alternates$", get_text_file},
728
	{"GET", "/objects/info/packs$", get_info_packs},
729
	{"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{38}$", get_loose_object},
730
	{"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{62}$", get_loose_object},
731
	{"GET", "/objects/pack/pack-[0-9a-f]{40}\\.pack$", get_pack_file},
732
	{"GET", "/objects/pack/pack-[0-9a-f]{64}\\.pack$", get_pack_file},
733
	{"GET", "/objects/pack/pack-[0-9a-f]{40}\\.idx$", get_idx_file},
734
	{"GET", "/objects/pack/pack-[0-9a-f]{64}\\.idx$", get_idx_file},
735

736
	{"POST", "/git-upload-pack$", service_rpc},
737
	{"POST", "/git-upload-archive$", service_rpc},
738
	{"POST", "/git-receive-pack$", service_rpc}
739
};
740

741
static int bad_request(struct strbuf *hdr, const struct service_cmd *c)
742
{
743
	const char *proto = getenv("SERVER_PROTOCOL");
744

745
	if (proto && !strcmp(proto, "HTTP/1.1")) {
746
		http_status(hdr, 405, "Method Not Allowed");
747
		hdr_str(hdr, "Allow",
748
			!strcmp(c->method, "GET") ? "GET, HEAD" : c->method);
749
	} else
750
		http_status(hdr, 400, "Bad Request");
751
	hdr_nocache(hdr);
752
	end_headers(hdr);
753
	return 0;
754
}
755

756
int cmd_main(int argc UNUSED, const char **argv UNUSED)
757
{
758
	const char *method = getenv("REQUEST_METHOD");
759
	const char *proto_header;
760
	char *dir;
761
	struct service_cmd *cmd = NULL;
762
	char *cmd_arg = NULL;
763
	int i;
764
	struct strbuf hdr = STRBUF_INIT;
765

766
	set_die_routine(die_webcgi);
767
	set_die_is_recursing_routine(die_webcgi_recursing);
768

769
	if (!method)
770
		die("No REQUEST_METHOD from server");
771
	if (!strcmp(method, "HEAD"))
772
		method = "GET";
773
	dir = getdir();
774

775
	for (i = 0; i < ARRAY_SIZE(services); i++) {
776
		struct service_cmd *c = &services[i];
777
		regex_t re;
778
		regmatch_t out[1];
779
		int ret;
780

781
		if (regcomp(&re, c->pattern, REG_EXTENDED))
782
			die("Bogus regex in service table: %s", c->pattern);
783
		ret = regexec(&re, dir, 1, out, 0);
784
		regfree(&re);
785

786
		if (!ret) {
787
			size_t n;
788

789
			if (strcmp(method, c->method))
790
				return bad_request(&hdr, c);
791

792
			cmd = c;
793
			n = out[0].rm_eo - out[0].rm_so;
794
			cmd_arg = xmemdupz(dir + out[0].rm_so + 1, n - 1);
795
			dir[out[0].rm_so] = 0;
796
			break;
797
		}
798
	}
799

800
	if (!cmd)
801
		not_found(&hdr, "Request not supported: '%s'", dir);
802

803
	setup_path();
804
	if (!enter_repo(dir, 0))
805
		not_found(&hdr, "Not a git repository: '%s'", dir);
806
	if (!getenv("GIT_HTTP_EXPORT_ALL") &&
807
	    access("git-daemon-export-ok", F_OK) )
808
		not_found(&hdr, "Repository not exported: '%s'", dir);
809
	free(dir);
810

811
	http_config();
812
	max_request_buffer = git_env_ulong("GIT_HTTP_MAX_REQUEST_BUFFER",
813
					   max_request_buffer);
814
	proto_header = getenv("HTTP_GIT_PROTOCOL");
815
	if (proto_header)
816
		setenv(GIT_PROTOCOL_ENVIRONMENT, proto_header, 0);
817

818
	cmd->imp(&hdr, cmd_arg);
819
	free(cmd_arg);
820
	return 0;
821
}
822