Convert struct object to object_id
[git/git.git] / http-backend.c
CommitLineData
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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"
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SP
7#include "run-command.h"
8#include "string-list.h"
638794cd 9#include "url.h"
e32a4581 10#include "argv-array.h"
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11
12static const char content_type[] = "Content-Type";
13static const char content_length[] = "Content-Length";
14static const char last_modified[] = "Last-Modified";
5abb013b 15static int getanyfile = 1;
6bc0cb51 16static unsigned long max_request_buffer = 10 * 1024 * 1024;
2f4038ab 17
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18static struct string_list *query_params;
19
20struct rpc_service {
21 const char *name;
22 const char *config_name;
6bc0cb51 23 unsigned buffer_input : 1;
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24 signed enabled : 2;
25};
26
27static struct rpc_service rpc_service[] = {
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28 { "upload-pack", "uploadpack", 1, 1 },
29 { "receive-pack", "receivepack", 0, -1 },
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SP
30};
31
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32static struct string_list *get_parameters(void)
33{
34 if (!query_params) {
35 const char *query = getenv("QUERY_STRING");
36
37 query_params = xcalloc(1, sizeof(*query_params));
38 while (query && *query) {
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JK
39 char *name = url_decode_parameter_name(&query);
40 char *value = url_decode_parameter_value(&query);
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SP
41 struct string_list_item *i;
42
e8c8b713 43 i = string_list_lookup(query_params, name);
556cfa3b 44 if (!i)
78a395d3 45 i = string_list_insert(query_params, name);
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SP
46 else
47 free(i->util);
48 i->util = value;
49 }
50 }
51 return query_params;
52}
53
54static const char *get_parameter(const char *name)
55{
56 struct string_list_item *i;
e8c8b713 57 i = string_list_lookup(get_parameters(), name);
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SP
58 return i ? i->util : NULL;
59}
60
35487017 61__attribute__((format (printf, 2, 3)))
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62static void format_write(int fd, const char *fmt, ...)
63{
64 static char buffer[1024];
65
66 va_list args;
67 unsigned n;
68
69 va_start(args, fmt);
70 n = vsnprintf(buffer, sizeof(buffer), fmt, args);
71 va_end(args);
72 if (n >= sizeof(buffer))
73 die("protocol error: impossibly long line");
74
cdf4fb8e 75 write_or_die(fd, buffer, n);
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76}
77
78static void http_status(unsigned code, const char *msg)
79{
80 format_write(1, "Status: %u %s\r\n", code, msg);
81}
82
83static void hdr_str(const char *name, const char *value)
84{
85 format_write(1, "%s: %s\r\n", name, value);
86}
87
4a5328d6 88static void hdr_int(const char *name, uintmax_t value)
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SP
89{
90 format_write(1, "%s: %" PRIuMAX "\r\n", name, value);
91}
92
93static void hdr_date(const char *name, unsigned long when)
94{
a5481a6c 95 const char *value = show_date(when, 0, DATE_MODE(RFC2822));
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96 hdr_str(name, value);
97}
98
99static void hdr_nocache(void)
100{
101 hdr_str("Expires", "Fri, 01 Jan 1980 00:00:00 GMT");
102 hdr_str("Pragma", "no-cache");
103 hdr_str("Cache-Control", "no-cache, max-age=0, must-revalidate");
104}
105
106static void hdr_cache_forever(void)
107{
108 unsigned long now = time(NULL);
109 hdr_date("Date", now);
110 hdr_date("Expires", now + 31536000);
111 hdr_str("Cache-Control", "public, max-age=31536000");
112}
113
114static void end_headers(void)
115{
cdf4fb8e 116 write_or_die(1, "\r\n", 2);
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117}
118
35487017 119__attribute__((format (printf, 1, 2)))
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120static NORETURN void not_found(const char *err, ...)
121{
122 va_list params;
123
124 http_status(404, "Not Found");
125 hdr_nocache();
126 end_headers();
127
128 va_start(params, err);
129 if (err && *err)
130 vfprintf(stderr, err, params);
131 va_end(params);
132 exit(0);
133}
134
35487017 135__attribute__((format (printf, 1, 2)))
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SP
136static NORETURN void forbidden(const char *err, ...)
137{
138 va_list params;
139
140 http_status(403, "Forbidden");
141 hdr_nocache();
142 end_headers();
143
144 va_start(params, err);
145 if (err && *err)
146 vfprintf(stderr, err, params);
147 va_end(params);
148 exit(0);
149}
150
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SP
151static void select_getanyfile(void)
152{
153 if (!getanyfile)
154 forbidden("Unsupported service: getanyfile");
155}
156
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157static void send_strbuf(const char *type, struct strbuf *buf)
158{
159 hdr_int(content_length, buf->len);
160 hdr_str(content_type, type);
161 end_headers();
cdf4fb8e 162 write_or_die(1, buf->buf, buf->len);
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SP
163}
164
92815b33 165static void send_local_file(const char *the_type, const char *name)
2f4038ab 166{
fcd12db6 167 char *p = git_pathdup("%s", name);
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168 size_t buf_alloc = 8192;
169 char *buf = xmalloc(buf_alloc);
170 int fd;
171 struct stat sb;
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172
173 fd = open(p, O_RDONLY);
174 if (fd < 0)
175 not_found("Cannot open '%s': %s", p, strerror(errno));
176 if (fstat(fd, &sb) < 0)
177 die_errno("Cannot stat '%s'", p);
178
4a5328d6 179 hdr_int(content_length, sb.st_size);
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SP
180 hdr_str(content_type, the_type);
181 hdr_date(last_modified, sb.st_mtime);
182 end_headers();
183
4a5328d6 184 for (;;) {
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185 ssize_t n = xread(fd, buf, buf_alloc);
186 if (n < 0)
187 die_errno("Cannot read '%s'", p);
188 if (!n)
189 break;
cdf4fb8e 190 write_or_die(1, buf, n);
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SP
191 }
192 close(fd);
193 free(buf);
fcd12db6 194 free(p);
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195}
196
197static void get_text_file(char *name)
198{
5abb013b 199 select_getanyfile();
2f4038ab 200 hdr_nocache();
92815b33 201 send_local_file("text/plain", name);
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SP
202}
203
204static void get_loose_object(char *name)
205{
5abb013b 206 select_getanyfile();
2f4038ab 207 hdr_cache_forever();
92815b33 208 send_local_file("application/x-git-loose-object", name);
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209}
210
211static void get_pack_file(char *name)
212{
5abb013b 213 select_getanyfile();
2f4038ab 214 hdr_cache_forever();
92815b33 215 send_local_file("application/x-git-packed-objects", name);
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SP
216}
217
218static void get_idx_file(char *name)
219{
5abb013b 220 select_getanyfile();
2f4038ab 221 hdr_cache_forever();
92815b33 222 send_local_file("application/x-git-packed-objects-toc", name);
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SP
223}
224
6881f0cc 225static void http_config(void)
556cfa3b 226{
6881f0cc
TA
227 int i, value = 0;
228 struct strbuf var = STRBUF_INIT;
ae021d87 229
6881f0cc 230 git_config_get_bool("http.getanyfile", &getanyfile);
6bc0cb51 231 git_config_get_ulong("http.maxrequestbuffer", &max_request_buffer);
556cfa3b 232
6881f0cc
TA
233 for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
234 struct rpc_service *svc = &rpc_service[i];
235 strbuf_addf(&var, "http.%s", svc->config_name);
236 if (!git_config_get_bool(var.buf, &value))
237 svc->enabled = value;
238 strbuf_reset(&var);
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SP
239 }
240
6881f0cc 241 strbuf_release(&var);
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242}
243
244static struct rpc_service *select_service(const char *name)
245{
ae021d87 246 const char *svc_name;
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247 struct rpc_service *svc = NULL;
248 int i;
249
ae021d87 250 if (!skip_prefix(name, "git-", &svc_name))
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251 forbidden("Unsupported service: '%s'", name);
252
253 for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
254 struct rpc_service *s = &rpc_service[i];
ae021d87 255 if (!strcmp(s->name, svc_name)) {
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256 svc = s;
257 break;
258 }
259 }
260
261 if (!svc)
262 forbidden("Unsupported service: '%s'", name);
263
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SP
264 if (svc->enabled < 0) {
265 const char *user = getenv("REMOTE_USER");
266 svc->enabled = (user && *user) ? 1 : 0;
267 }
268 if (!svc->enabled)
269 forbidden("Service not enabled: '%s'", svc->name);
270 return svc;
271}
272
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JK
273/*
274 * This is basically strbuf_read(), except that if we
275 * hit max_request_buffer we die (we'd rather reject a
276 * maliciously large request than chew up infinite memory).
277 */
278static ssize_t read_request(int fd, unsigned char **out)
279{
280 size_t len = 0, alloc = 8192;
281 unsigned char *buf = xmalloc(alloc);
282
283 if (max_request_buffer < alloc)
284 max_request_buffer = alloc;
285
286 while (1) {
287 ssize_t cnt;
288
289 cnt = read_in_full(fd, buf + len, alloc - len);
290 if (cnt < 0) {
291 free(buf);
292 return -1;
293 }
294
295 /* partial read from read_in_full means we hit EOF */
296 len += cnt;
297 if (len < alloc) {
298 *out = buf;
299 return len;
300 }
301
302 /* otherwise, grow and try again (if we can) */
303 if (alloc == max_request_buffer)
304 die("request was larger than our maximum size (%lu);"
305 " try setting GIT_HTTP_MAX_REQUEST_BUFFER",
306 max_request_buffer);
307
308 alloc = alloc_nr(alloc);
309 if (alloc > max_request_buffer)
310 alloc = max_request_buffer;
311 REALLOC_ARRAY(buf, alloc);
312 }
313}
314
315static void inflate_request(const char *prog_name, int out, int buffer_input)
556cfa3b 316{
ef49a7a0 317 git_zstream stream;
6bc0cb51 318 unsigned char *full_request = NULL;
556cfa3b
SP
319 unsigned char in_buf[8192];
320 unsigned char out_buf[8192];
321 unsigned long cnt = 0;
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SP
322
323 memset(&stream, 0, sizeof(stream));
5e86c1fb 324 git_inflate_init_gzip_only(&stream);
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SP
325
326 while (1) {
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JK
327 ssize_t n;
328
329 if (buffer_input) {
330 if (full_request)
331 n = 0; /* nothing left to read */
332 else
333 n = read_request(0, &full_request);
334 stream.next_in = full_request;
335 } else {
336 n = xread(0, in_buf, sizeof(in_buf));
337 stream.next_in = in_buf;
338 }
339
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SP
340 if (n <= 0)
341 die("request ended in the middle of the gzip stream");
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SP
342 stream.avail_in = n;
343
344 while (0 < stream.avail_in) {
345 int ret;
346
347 stream.next_out = out_buf;
348 stream.avail_out = sizeof(out_buf);
349
9e7e5ca3 350 ret = git_inflate(&stream, Z_NO_FLUSH);
556cfa3b
SP
351 if (ret != Z_OK && ret != Z_STREAM_END)
352 die("zlib error inflating request, result %d", ret);
353
354 n = stream.total_out - cnt;
355 if (write_in_full(out, out_buf, n) != n)
356 die("%s aborted reading request", prog_name);
357 cnt += n;
358
359 if (ret == Z_STREAM_END)
360 goto done;
361 }
362 }
363
364done:
9e7e5ca3 365 git_inflate_end(&stream);
556cfa3b 366 close(out);
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JK
367 free(full_request);
368}
369
370static void copy_request(const char *prog_name, int out)
371{
372 unsigned char *buf;
373 ssize_t n = read_request(0, &buf);
374 if (n < 0)
375 die_errno("error reading request body");
376 if (write_in_full(out, buf, n) != n)
377 die("%s aborted reading request", prog_name);
378 close(out);
379 free(buf);
556cfa3b
SP
380}
381
6bc0cb51 382static void run_service(const char **argv, int buffer_input)
556cfa3b
SP
383{
384 const char *encoding = getenv("HTTP_CONTENT_ENCODING");
385 const char *user = getenv("REMOTE_USER");
386 const char *host = getenv("REMOTE_ADDR");
556cfa3b 387 int gzipped_request = 0;
d3180279 388 struct child_process cld = CHILD_PROCESS_INIT;
556cfa3b
SP
389
390 if (encoding && !strcmp(encoding, "gzip"))
391 gzipped_request = 1;
392 else if (encoding && !strcmp(encoding, "x-gzip"))
393 gzipped_request = 1;
394
395 if (!user || !*user)
396 user = "anonymous";
397 if (!host || !*host)
398 host = "(none)";
399
e32a4581 400 if (!getenv("GIT_COMMITTER_NAME"))
a9154590 401 argv_array_pushf(&cld.env_array, "GIT_COMMITTER_NAME=%s", user);
e32a4581 402 if (!getenv("GIT_COMMITTER_EMAIL"))
a9154590
RS
403 argv_array_pushf(&cld.env_array,
404 "GIT_COMMITTER_EMAIL=%s@http.%s", user, host);
556cfa3b 405
556cfa3b 406 cld.argv = argv;
6bc0cb51 407 if (buffer_input || gzipped_request)
556cfa3b
SP
408 cld.in = -1;
409 cld.git_cmd = 1;
410 if (start_command(&cld))
411 exit(1);
412
413 close(1);
414 if (gzipped_request)
6bc0cb51
JK
415 inflate_request(argv[0], cld.in, buffer_input);
416 else if (buffer_input)
417 copy_request(argv[0], cld.in);
556cfa3b
SP
418 else
419 close(0);
420
421 if (finish_command(&cld))
422 exit(1);
556cfa3b
SP
423}
424
f72f5421
MH
425static int show_text_ref(const char *name, const struct object_id *oid,
426 int flag, void *cb_data)
2f4038ab 427{
6130f86d 428 const char *name_nons = strip_namespace(name);
2f4038ab 429 struct strbuf *buf = cb_data;
f72f5421 430 struct object *o = parse_object(oid->hash);
2f4038ab
SP
431 if (!o)
432 return 0;
433
f72f5421 434 strbuf_addf(buf, "%s\t%s\n", oid_to_hex(oid), name_nons);
2f4038ab
SP
435 if (o->type == OBJ_TAG) {
436 o = deref_tag(o, name, 0);
437 if (!o)
438 return 0;
f2fd0760 439 strbuf_addf(buf, "%s\t%s^{}\n", oid_to_hex(&o->oid),
6130f86d 440 name_nons);
2f4038ab
SP
441 }
442 return 0;
443}
444
445static void get_info_refs(char *arg)
446{
556cfa3b 447 const char *service_name = get_parameter("service");
2f4038ab
SP
448 struct strbuf buf = STRBUF_INIT;
449
2f4038ab 450 hdr_nocache();
556cfa3b
SP
451
452 if (service_name) {
453 const char *argv[] = {NULL /* service name */,
454 "--stateless-rpc", "--advertise-refs",
455 ".", NULL};
456 struct rpc_service *svc = select_service(service_name);
457
458 strbuf_addf(&buf, "application/x-git-%s-advertisement",
459 svc->name);
460 hdr_str(content_type, buf.buf);
461 end_headers();
462
463 packet_write(1, "# service=git-%s\n", svc->name);
464 packet_flush(1);
465
466 argv[0] = svc->name;
6bc0cb51 467 run_service(argv, 0);
556cfa3b
SP
468
469 } else {
5abb013b 470 select_getanyfile();
6130f86d 471 for_each_namespaced_ref(show_text_ref, &buf);
556cfa3b
SP
472 send_strbuf("text/plain", &buf);
473 }
2f4038ab
SP
474 strbuf_release(&buf);
475}
476
f72f5421
MH
477static int show_head_ref(const char *refname, const struct object_id *oid,
478 int flag, void *cb_data)
6130f86d
JK
479{
480 struct strbuf *buf = cb_data;
481
482 if (flag & REF_ISSYMREF) {
5f9cf5ab 483 struct object_id unused;
7695d118
RS
484 const char *target = resolve_ref_unsafe(refname,
485 RESOLVE_REF_READING,
5f9cf5ab 486 unused.hash, NULL);
6130f86d
JK
487 const char *target_nons = strip_namespace(target);
488
489 strbuf_addf(buf, "ref: %s\n", target_nons);
490 } else {
f72f5421 491 strbuf_addf(buf, "%s\n", oid_to_hex(oid));
6130f86d
JK
492 }
493
494 return 0;
495}
496
497static void get_head(char *arg)
498{
499 struct strbuf buf = STRBUF_INIT;
500
501 select_getanyfile();
502 head_ref_namespaced(show_head_ref, &buf);
503 send_strbuf("text/plain", &buf);
504 strbuf_release(&buf);
505}
506
2f4038ab
SP
507static void get_info_packs(char *arg)
508{
509 size_t objdirlen = strlen(get_object_directory());
510 struct strbuf buf = STRBUF_INIT;
511 struct packed_git *p;
512 size_t cnt = 0;
513
5abb013b 514 select_getanyfile();
2f4038ab
SP
515 prepare_packed_git();
516 for (p = packed_git; p; p = p->next) {
517 if (p->pack_local)
518 cnt++;
519 }
520
521 strbuf_grow(&buf, cnt * 53 + 2);
522 for (p = packed_git; p; p = p->next) {
523 if (p->pack_local)
524 strbuf_addf(&buf, "P %s\n", p->pack_name + objdirlen + 6);
525 }
526 strbuf_addch(&buf, '\n');
527
528 hdr_nocache();
529 send_strbuf("text/plain; charset=utf-8", &buf);
530 strbuf_release(&buf);
531}
532
556cfa3b
SP
533static void check_content_type(const char *accepted_type)
534{
535 const char *actual_type = getenv("CONTENT_TYPE");
536
537 if (!actual_type)
538 actual_type = "";
539
540 if (strcmp(actual_type, accepted_type)) {
541 http_status(415, "Unsupported Media Type");
542 hdr_nocache();
543 end_headers();
544 format_write(1,
545 "Expected POST with Content-Type '%s',"
546 " but received '%s' instead.\n",
547 accepted_type, actual_type);
548 exit(0);
549 }
550}
551
552static void service_rpc(char *service_name)
553{
554 const char *argv[] = {NULL, "--stateless-rpc", ".", NULL};
555 struct rpc_service *svc = select_service(service_name);
556 struct strbuf buf = STRBUF_INIT;
557
558 strbuf_reset(&buf);
559 strbuf_addf(&buf, "application/x-git-%s-request", svc->name);
560 check_content_type(buf.buf);
561
562 hdr_nocache();
563
564 strbuf_reset(&buf);
565 strbuf_addf(&buf, "application/x-git-%s-result", svc->name);
566 hdr_str(content_type, buf.buf);
567
568 end_headers();
569
570 argv[0] = svc->name;
6bc0cb51 571 run_service(argv, svc->buffer_input);
556cfa3b
SP
572 strbuf_release(&buf);
573}
574
7253a023 575static int dead;
2f4038ab
SP
576static NORETURN void die_webcgi(const char *err, va_list params)
577{
7253a023
JK
578 if (dead <= 1) {
579 vreportf("fatal: ", err, params);
2f4038ab 580
5856b5f5
SP
581 http_status(500, "Internal Server Error");
582 hdr_nocache();
583 end_headers();
584 }
585 exit(0); /* we successfully reported a failure ;-) */
2f4038ab
SP
586}
587
7253a023
JK
588static int die_webcgi_recursing(void)
589{
590 return dead++ > 1;
591}
592
917adc03
ML
593static char* getdir(void)
594{
595 struct strbuf buf = STRBUF_INIT;
596 char *pathinfo = getenv("PATH_INFO");
597 char *root = getenv("GIT_PROJECT_ROOT");
598 char *path = getenv("PATH_TRANSLATED");
599
600 if (root && *root) {
601 if (!pathinfo || !*pathinfo)
602 die("GIT_PROJECT_ROOT is set but PATH_INFO is not");
34b6cb8b
SP
603 if (daemon_avoid_alias(pathinfo))
604 die("'%s': aliased", pathinfo);
cf688cc2 605 end_url_with_slash(&buf, root);
34b6cb8b
SP
606 if (pathinfo[0] == '/')
607 pathinfo++;
917adc03
ML
608 strbuf_addstr(&buf, pathinfo);
609 return strbuf_detach(&buf, NULL);
610 } else if (path && *path) {
611 return xstrdup(path);
612 } else
613 die("No GIT_PROJECT_ROOT or PATH_TRANSLATED from server");
614 return NULL;
615}
616
2f4038ab
SP
617static struct service_cmd {
618 const char *method;
619 const char *pattern;
620 void (*imp)(char *);
621} services[] = {
6130f86d 622 {"GET", "/HEAD$", get_head},
2f4038ab
SP
623 {"GET", "/info/refs$", get_info_refs},
624 {"GET", "/objects/info/alternates$", get_text_file},
625 {"GET", "/objects/info/http-alternates$", get_text_file},
626 {"GET", "/objects/info/packs$", get_info_packs},
627 {"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{38}$", get_loose_object},
628 {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.pack$", get_pack_file},
556cfa3b
SP
629 {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.idx$", get_idx_file},
630
631 {"POST", "/git-upload-pack$", service_rpc},
632 {"POST", "/git-receive-pack$", service_rpc}
2f4038ab
SP
633};
634
635int main(int argc, char **argv)
636{
637 char *method = getenv("REQUEST_METHOD");
917adc03 638 char *dir;
2f4038ab
SP
639 struct service_cmd *cmd = NULL;
640 char *cmd_arg = NULL;
641 int i;
642
5e9637c6
ÆAB
643 git_setup_gettext();
644
2f4038ab
SP
645 git_extract_argv0_path(argv[0]);
646 set_die_routine(die_webcgi);
7253a023 647 set_die_is_recursing_routine(die_webcgi_recursing);
2f4038ab
SP
648
649 if (!method)
650 die("No REQUEST_METHOD from server");
651 if (!strcmp(method, "HEAD"))
652 method = "GET";
917adc03 653 dir = getdir();
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654
655 for (i = 0; i < ARRAY_SIZE(services); i++) {
656 struct service_cmd *c = &services[i];
657 regex_t re;
658 regmatch_t out[1];
659
660 if (regcomp(&re, c->pattern, REG_EXTENDED))
661 die("Bogus regex in service table: %s", c->pattern);
662 if (!regexec(&re, dir, 1, out, 0)) {
48aec1b1 663 size_t n;
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664
665 if (strcmp(method, c->method)) {
666 const char *proto = getenv("SERVER_PROTOCOL");
9247be05 667 if (proto && !strcmp(proto, "HTTP/1.1")) {
2f4038ab 668 http_status(405, "Method Not Allowed");
9247be05 669 hdr_str("Allow", !strcmp(c->method, "GET") ?
670 "GET, HEAD" : c->method);
671 } else
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672 http_status(400, "Bad Request");
673 hdr_nocache();
674 end_headers();
675 return 0;
676 }
677
678 cmd = c;
48aec1b1 679 n = out[0].rm_eo - out[0].rm_so;
5c0b13f8 680 cmd_arg = xmemdupz(dir + out[0].rm_so + 1, n - 1);
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681 dir[out[0].rm_so] = 0;
682 break;
683 }
684 regfree(&re);
685 }
686
687 if (!cmd)
688 not_found("Request not supported: '%s'", dir);
689
690 setup_path();
691 if (!enter_repo(dir, 0))
692 not_found("Not a git repository: '%s'", dir);
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693 if (!getenv("GIT_HTTP_EXPORT_ALL") &&
694 access("git-daemon-export-ok", F_OK) )
695 not_found("Repository not exported: '%s'", dir);
2f4038ab 696
6881f0cc 697 http_config();
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698 max_request_buffer = git_env_ulong("GIT_HTTP_MAX_REQUEST_BUFFER",
699 max_request_buffer);
700
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701 cmd->imp(cmd_arg);
702 return 0;
703}