append_similar_ref(): rewrite to take an object_id argument
[git/git.git] / http-backend.c
CommitLineData
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"
638794cd 9#include "url.h"
e32a4581 10#include "argv-array.h"
2f4038ab
SP
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;
2f4038ab 16
556cfa3b
SP
17static struct string_list *query_params;
18
19struct rpc_service {
20 const char *name;
21 const char *config_name;
22 signed enabled : 2;
23};
24
25static struct rpc_service rpc_service[] = {
26 { "upload-pack", "uploadpack", 1 },
27 { "receive-pack", "receivepack", -1 },
28};
29
556cfa3b
SP
30static struct string_list *get_parameters(void)
31{
32 if (!query_params) {
33 const char *query = getenv("QUERY_STRING");
34
35 query_params = xcalloc(1, sizeof(*query_params));
36 while (query && *query) {
638794cd
JK
37 char *name = url_decode_parameter_name(&query);
38 char *value = url_decode_parameter_value(&query);
556cfa3b
SP
39 struct string_list_item *i;
40
e8c8b713 41 i = string_list_lookup(query_params, name);
556cfa3b 42 if (!i)
78a395d3 43 i = string_list_insert(query_params, name);
556cfa3b
SP
44 else
45 free(i->util);
46 i->util = value;
47 }
48 }
49 return query_params;
50}
51
52static const char *get_parameter(const char *name)
53{
54 struct string_list_item *i;
e8c8b713 55 i = string_list_lookup(get_parameters(), name);
556cfa3b
SP
56 return i ? i->util : NULL;
57}
58
35487017 59__attribute__((format (printf, 2, 3)))
2f4038ab
SP
60static void format_write(int fd, const char *fmt, ...)
61{
62 static char buffer[1024];
63
64 va_list args;
65 unsigned n;
66
67 va_start(args, fmt);
68 n = vsnprintf(buffer, sizeof(buffer), fmt, args);
69 va_end(args);
70 if (n >= sizeof(buffer))
71 die("protocol error: impossibly long line");
72
cdf4fb8e 73 write_or_die(fd, buffer, n);
2f4038ab
SP
74}
75
76static void http_status(unsigned code, const char *msg)
77{
78 format_write(1, "Status: %u %s\r\n", code, msg);
79}
80
81static void hdr_str(const char *name, const char *value)
82{
83 format_write(1, "%s: %s\r\n", name, value);
84}
85
4a5328d6 86static void hdr_int(const char *name, uintmax_t value)
2f4038ab
SP
87{
88 format_write(1, "%s: %" PRIuMAX "\r\n", name, value);
89}
90
91static void hdr_date(const char *name, unsigned long when)
92{
93 const char *value = show_date(when, 0, DATE_RFC2822);
94 hdr_str(name, value);
95}
96
97static void hdr_nocache(void)
98{
99 hdr_str("Expires", "Fri, 01 Jan 1980 00:00:00 GMT");
100 hdr_str("Pragma", "no-cache");
101 hdr_str("Cache-Control", "no-cache, max-age=0, must-revalidate");
102}
103
104static void hdr_cache_forever(void)
105{
106 unsigned long now = time(NULL);
107 hdr_date("Date", now);
108 hdr_date("Expires", now + 31536000);
109 hdr_str("Cache-Control", "public, max-age=31536000");
110}
111
112static void end_headers(void)
113{
cdf4fb8e 114 write_or_die(1, "\r\n", 2);
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SP
115}
116
35487017 117__attribute__((format (printf, 1, 2)))
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SP
118static NORETURN void not_found(const char *err, ...)
119{
120 va_list params;
121
122 http_status(404, "Not Found");
123 hdr_nocache();
124 end_headers();
125
126 va_start(params, err);
127 if (err && *err)
128 vfprintf(stderr, err, params);
129 va_end(params);
130 exit(0);
131}
132
35487017 133__attribute__((format (printf, 1, 2)))
556cfa3b
SP
134static NORETURN void forbidden(const char *err, ...)
135{
136 va_list params;
137
138 http_status(403, "Forbidden");
139 hdr_nocache();
140 end_headers();
141
142 va_start(params, err);
143 if (err && *err)
144 vfprintf(stderr, err, params);
145 va_end(params);
146 exit(0);
147}
148
5abb013b
SP
149static void select_getanyfile(void)
150{
151 if (!getanyfile)
152 forbidden("Unsupported service: getanyfile");
153}
154
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SP
155static void send_strbuf(const char *type, struct strbuf *buf)
156{
157 hdr_int(content_length, buf->len);
158 hdr_str(content_type, type);
159 end_headers();
cdf4fb8e 160 write_or_die(1, buf->buf, buf->len);
2f4038ab
SP
161}
162
92815b33 163static void send_local_file(const char *the_type, const char *name)
2f4038ab
SP
164{
165 const char *p = git_path("%s", name);
166 size_t buf_alloc = 8192;
167 char *buf = xmalloc(buf_alloc);
168 int fd;
169 struct stat sb;
2f4038ab
SP
170
171 fd = open(p, O_RDONLY);
172 if (fd < 0)
173 not_found("Cannot open '%s': %s", p, strerror(errno));
174 if (fstat(fd, &sb) < 0)
175 die_errno("Cannot stat '%s'", p);
176
4a5328d6 177 hdr_int(content_length, sb.st_size);
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SP
178 hdr_str(content_type, the_type);
179 hdr_date(last_modified, sb.st_mtime);
180 end_headers();
181
4a5328d6 182 for (;;) {
2f4038ab
SP
183 ssize_t n = xread(fd, buf, buf_alloc);
184 if (n < 0)
185 die_errno("Cannot read '%s'", p);
186 if (!n)
187 break;
cdf4fb8e 188 write_or_die(1, buf, n);
2f4038ab
SP
189 }
190 close(fd);
191 free(buf);
192}
193
194static void get_text_file(char *name)
195{
5abb013b 196 select_getanyfile();
2f4038ab 197 hdr_nocache();
92815b33 198 send_local_file("text/plain", name);
2f4038ab
SP
199}
200
201static void get_loose_object(char *name)
202{
5abb013b 203 select_getanyfile();
2f4038ab 204 hdr_cache_forever();
92815b33 205 send_local_file("application/x-git-loose-object", name);
2f4038ab
SP
206}
207
208static void get_pack_file(char *name)
209{
5abb013b 210 select_getanyfile();
2f4038ab 211 hdr_cache_forever();
92815b33 212 send_local_file("application/x-git-packed-objects", name);
2f4038ab
SP
213}
214
215static void get_idx_file(char *name)
216{
5abb013b 217 select_getanyfile();
2f4038ab 218 hdr_cache_forever();
92815b33 219 send_local_file("application/x-git-packed-objects-toc", name);
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SP
220}
221
6881f0cc 222static void http_config(void)
556cfa3b 223{
6881f0cc
TA
224 int i, value = 0;
225 struct strbuf var = STRBUF_INIT;
ae021d87 226
6881f0cc 227 git_config_get_bool("http.getanyfile", &getanyfile);
556cfa3b 228
6881f0cc
TA
229 for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
230 struct rpc_service *svc = &rpc_service[i];
231 strbuf_addf(&var, "http.%s", svc->config_name);
232 if (!git_config_get_bool(var.buf, &value))
233 svc->enabled = value;
234 strbuf_reset(&var);
5abb013b
SP
235 }
236
6881f0cc 237 strbuf_release(&var);
556cfa3b
SP
238}
239
240static struct rpc_service *select_service(const char *name)
241{
ae021d87 242 const char *svc_name;
556cfa3b
SP
243 struct rpc_service *svc = NULL;
244 int i;
245
ae021d87 246 if (!skip_prefix(name, "git-", &svc_name))
556cfa3b
SP
247 forbidden("Unsupported service: '%s'", name);
248
249 for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
250 struct rpc_service *s = &rpc_service[i];
ae021d87 251 if (!strcmp(s->name, svc_name)) {
556cfa3b
SP
252 svc = s;
253 break;
254 }
255 }
256
257 if (!svc)
258 forbidden("Unsupported service: '%s'", name);
259
556cfa3b
SP
260 if (svc->enabled < 0) {
261 const char *user = getenv("REMOTE_USER");
262 svc->enabled = (user && *user) ? 1 : 0;
263 }
264 if (!svc->enabled)
265 forbidden("Service not enabled: '%s'", svc->name);
266 return svc;
267}
268
269static void inflate_request(const char *prog_name, int out)
270{
ef49a7a0 271 git_zstream stream;
556cfa3b
SP
272 unsigned char in_buf[8192];
273 unsigned char out_buf[8192];
274 unsigned long cnt = 0;
556cfa3b
SP
275
276 memset(&stream, 0, sizeof(stream));
5e86c1fb 277 git_inflate_init_gzip_only(&stream);
556cfa3b
SP
278
279 while (1) {
280 ssize_t n = xread(0, in_buf, sizeof(in_buf));
281 if (n <= 0)
282 die("request ended in the middle of the gzip stream");
283
284 stream.next_in = in_buf;
285 stream.avail_in = n;
286
287 while (0 < stream.avail_in) {
288 int ret;
289
290 stream.next_out = out_buf;
291 stream.avail_out = sizeof(out_buf);
292
9e7e5ca3 293 ret = git_inflate(&stream, Z_NO_FLUSH);
556cfa3b
SP
294 if (ret != Z_OK && ret != Z_STREAM_END)
295 die("zlib error inflating request, result %d", ret);
296
297 n = stream.total_out - cnt;
298 if (write_in_full(out, out_buf, n) != n)
299 die("%s aborted reading request", prog_name);
300 cnt += n;
301
302 if (ret == Z_STREAM_END)
303 goto done;
304 }
305 }
306
307done:
9e7e5ca3 308 git_inflate_end(&stream);
556cfa3b
SP
309 close(out);
310}
311
312static void run_service(const char **argv)
313{
314 const char *encoding = getenv("HTTP_CONTENT_ENCODING");
315 const char *user = getenv("REMOTE_USER");
316 const char *host = getenv("REMOTE_ADDR");
556cfa3b 317 int gzipped_request = 0;
d3180279 318 struct child_process cld = CHILD_PROCESS_INIT;
556cfa3b
SP
319
320 if (encoding && !strcmp(encoding, "gzip"))
321 gzipped_request = 1;
322 else if (encoding && !strcmp(encoding, "x-gzip"))
323 gzipped_request = 1;
324
325 if (!user || !*user)
326 user = "anonymous";
327 if (!host || !*host)
328 host = "(none)";
329
e32a4581 330 if (!getenv("GIT_COMMITTER_NAME"))
a9154590 331 argv_array_pushf(&cld.env_array, "GIT_COMMITTER_NAME=%s", user);
e32a4581 332 if (!getenv("GIT_COMMITTER_EMAIL"))
a9154590
RS
333 argv_array_pushf(&cld.env_array,
334 "GIT_COMMITTER_EMAIL=%s@http.%s", user, host);
556cfa3b 335
556cfa3b 336 cld.argv = argv;
556cfa3b
SP
337 if (gzipped_request)
338 cld.in = -1;
339 cld.git_cmd = 1;
340 if (start_command(&cld))
341 exit(1);
342
343 close(1);
344 if (gzipped_request)
345 inflate_request(argv[0], cld.in);
346 else
347 close(0);
348
349 if (finish_command(&cld))
350 exit(1);
556cfa3b
SP
351}
352
2f4038ab
SP
353static int show_text_ref(const char *name, const unsigned char *sha1,
354 int flag, void *cb_data)
355{
6130f86d 356 const char *name_nons = strip_namespace(name);
2f4038ab
SP
357 struct strbuf *buf = cb_data;
358 struct object *o = parse_object(sha1);
359 if (!o)
360 return 0;
361
6130f86d 362 strbuf_addf(buf, "%s\t%s\n", sha1_to_hex(sha1), name_nons);
2f4038ab
SP
363 if (o->type == OBJ_TAG) {
364 o = deref_tag(o, name, 0);
365 if (!o)
366 return 0;
6130f86d
JK
367 strbuf_addf(buf, "%s\t%s^{}\n", sha1_to_hex(o->sha1),
368 name_nons);
2f4038ab
SP
369 }
370 return 0;
371}
372
373static void get_info_refs(char *arg)
374{
556cfa3b 375 const char *service_name = get_parameter("service");
2f4038ab
SP
376 struct strbuf buf = STRBUF_INIT;
377
2f4038ab 378 hdr_nocache();
556cfa3b
SP
379
380 if (service_name) {
381 const char *argv[] = {NULL /* service name */,
382 "--stateless-rpc", "--advertise-refs",
383 ".", NULL};
384 struct rpc_service *svc = select_service(service_name);
385
386 strbuf_addf(&buf, "application/x-git-%s-advertisement",
387 svc->name);
388 hdr_str(content_type, buf.buf);
389 end_headers();
390
391 packet_write(1, "# service=git-%s\n", svc->name);
392 packet_flush(1);
393
394 argv[0] = svc->name;
395 run_service(argv);
396
397 } else {
2b2a5be3
MH
398 struct each_ref_fn_sha1_adapter wrapped_show_text_ref =
399 {show_text_ref, &buf};
400
5abb013b 401 select_getanyfile();
2b2a5be3 402 for_each_namespaced_ref(each_ref_fn_adapter, &wrapped_show_text_ref);
556cfa3b
SP
403 send_strbuf("text/plain", &buf);
404 }
2f4038ab
SP
405 strbuf_release(&buf);
406}
407
3e4ca43f 408static int show_head_ref(const char *refname, const unsigned char *sha1,
6130f86d
JK
409 int flag, void *cb_data)
410{
411 struct strbuf *buf = cb_data;
412
413 if (flag & REF_ISSYMREF) {
1d811dbd 414 unsigned char unused[20];
7695d118
RS
415 const char *target = resolve_ref_unsafe(refname,
416 RESOLVE_REF_READING,
417 unused, NULL);
6130f86d
JK
418 const char *target_nons = strip_namespace(target);
419
420 strbuf_addf(buf, "ref: %s\n", target_nons);
421 } else {
422 strbuf_addf(buf, "%s\n", sha1_to_hex(sha1));
423 }
424
425 return 0;
426}
427
428static void get_head(char *arg)
429{
430 struct strbuf buf = STRBUF_INIT;
2b2a5be3
MH
431 struct each_ref_fn_sha1_adapter wrapped_show_head_ref =
432 {show_head_ref, &buf};
6130f86d
JK
433
434 select_getanyfile();
2b2a5be3 435 head_ref_namespaced(each_ref_fn_adapter, &wrapped_show_head_ref);
6130f86d
JK
436 send_strbuf("text/plain", &buf);
437 strbuf_release(&buf);
438}
439
2f4038ab
SP
440static void get_info_packs(char *arg)
441{
442 size_t objdirlen = strlen(get_object_directory());
443 struct strbuf buf = STRBUF_INIT;
444 struct packed_git *p;
445 size_t cnt = 0;
446
5abb013b 447 select_getanyfile();
2f4038ab
SP
448 prepare_packed_git();
449 for (p = packed_git; p; p = p->next) {
450 if (p->pack_local)
451 cnt++;
452 }
453
454 strbuf_grow(&buf, cnt * 53 + 2);
455 for (p = packed_git; p; p = p->next) {
456 if (p->pack_local)
457 strbuf_addf(&buf, "P %s\n", p->pack_name + objdirlen + 6);
458 }
459 strbuf_addch(&buf, '\n');
460
461 hdr_nocache();
462 send_strbuf("text/plain; charset=utf-8", &buf);
463 strbuf_release(&buf);
464}
465
556cfa3b
SP
466static void check_content_type(const char *accepted_type)
467{
468 const char *actual_type = getenv("CONTENT_TYPE");
469
470 if (!actual_type)
471 actual_type = "";
472
473 if (strcmp(actual_type, accepted_type)) {
474 http_status(415, "Unsupported Media Type");
475 hdr_nocache();
476 end_headers();
477 format_write(1,
478 "Expected POST with Content-Type '%s',"
479 " but received '%s' instead.\n",
480 accepted_type, actual_type);
481 exit(0);
482 }
483}
484
485static void service_rpc(char *service_name)
486{
487 const char *argv[] = {NULL, "--stateless-rpc", ".", NULL};
488 struct rpc_service *svc = select_service(service_name);
489 struct strbuf buf = STRBUF_INIT;
490
491 strbuf_reset(&buf);
492 strbuf_addf(&buf, "application/x-git-%s-request", svc->name);
493 check_content_type(buf.buf);
494
495 hdr_nocache();
496
497 strbuf_reset(&buf);
498 strbuf_addf(&buf, "application/x-git-%s-result", svc->name);
499 hdr_str(content_type, buf.buf);
500
501 end_headers();
502
503 argv[0] = svc->name;
504 run_service(argv);
505 strbuf_release(&buf);
506}
507
2f4038ab
SP
508static NORETURN void die_webcgi(const char *err, va_list params)
509{
5856b5f5 510 static int dead;
2f4038ab 511
5856b5f5 512 if (!dead) {
5856b5f5 513 dead = 1;
5856b5f5
SP
514 http_status(500, "Internal Server Error");
515 hdr_nocache();
516 end_headers();
76265501
JH
517
518 vreportf("fatal: ", err, params);
5856b5f5
SP
519 }
520 exit(0); /* we successfully reported a failure ;-) */
2f4038ab
SP
521}
522
917adc03
ML
523static char* getdir(void)
524{
525 struct strbuf buf = STRBUF_INIT;
526 char *pathinfo = getenv("PATH_INFO");
527 char *root = getenv("GIT_PROJECT_ROOT");
528 char *path = getenv("PATH_TRANSLATED");
529
530 if (root && *root) {
531 if (!pathinfo || !*pathinfo)
532 die("GIT_PROJECT_ROOT is set but PATH_INFO is not");
34b6cb8b
SP
533 if (daemon_avoid_alias(pathinfo))
534 die("'%s': aliased", pathinfo);
cf688cc2 535 end_url_with_slash(&buf, root);
34b6cb8b
SP
536 if (pathinfo[0] == '/')
537 pathinfo++;
917adc03
ML
538 strbuf_addstr(&buf, pathinfo);
539 return strbuf_detach(&buf, NULL);
540 } else if (path && *path) {
541 return xstrdup(path);
542 } else
543 die("No GIT_PROJECT_ROOT or PATH_TRANSLATED from server");
544 return NULL;
545}
546
2f4038ab
SP
547static struct service_cmd {
548 const char *method;
549 const char *pattern;
550 void (*imp)(char *);
551} services[] = {
6130f86d 552 {"GET", "/HEAD$", get_head},
2f4038ab
SP
553 {"GET", "/info/refs$", get_info_refs},
554 {"GET", "/objects/info/alternates$", get_text_file},
555 {"GET", "/objects/info/http-alternates$", get_text_file},
556 {"GET", "/objects/info/packs$", get_info_packs},
557 {"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{38}$", get_loose_object},
558 {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.pack$", get_pack_file},
556cfa3b
SP
559 {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.idx$", get_idx_file},
560
561 {"POST", "/git-upload-pack$", service_rpc},
562 {"POST", "/git-receive-pack$", service_rpc}
2f4038ab
SP
563};
564
565int main(int argc, char **argv)
566{
567 char *method = getenv("REQUEST_METHOD");
917adc03 568 char *dir;
2f4038ab
SP
569 struct service_cmd *cmd = NULL;
570 char *cmd_arg = NULL;
571 int i;
572
5e9637c6
ÆAB
573 git_setup_gettext();
574
2f4038ab
SP
575 git_extract_argv0_path(argv[0]);
576 set_die_routine(die_webcgi);
577
578 if (!method)
579 die("No REQUEST_METHOD from server");
580 if (!strcmp(method, "HEAD"))
581 method = "GET";
917adc03 582 dir = getdir();
2f4038ab
SP
583
584 for (i = 0; i < ARRAY_SIZE(services); i++) {
585 struct service_cmd *c = &services[i];
586 regex_t re;
587 regmatch_t out[1];
588
589 if (regcomp(&re, c->pattern, REG_EXTENDED))
590 die("Bogus regex in service table: %s", c->pattern);
591 if (!regexec(&re, dir, 1, out, 0)) {
48aec1b1 592 size_t n;
2f4038ab
SP
593
594 if (strcmp(method, c->method)) {
595 const char *proto = getenv("SERVER_PROTOCOL");
9247be05 596 if (proto && !strcmp(proto, "HTTP/1.1")) {
2f4038ab 597 http_status(405, "Method Not Allowed");
9247be05 598 hdr_str("Allow", !strcmp(c->method, "GET") ?
599 "GET, HEAD" : c->method);
600 } else
2f4038ab
SP
601 http_status(400, "Bad Request");
602 hdr_nocache();
603 end_headers();
604 return 0;
605 }
606
607 cmd = c;
48aec1b1 608 n = out[0].rm_eo - out[0].rm_so;
5c0b13f8 609 cmd_arg = xmemdupz(dir + out[0].rm_so + 1, n - 1);
2f4038ab
SP
610 dir[out[0].rm_so] = 0;
611 break;
612 }
613 regfree(&re);
614 }
615
616 if (!cmd)
617 not_found("Request not supported: '%s'", dir);
618
619 setup_path();
620 if (!enter_repo(dir, 0))
621 not_found("Not a git repository: '%s'", dir);
8b2bd7cd
TC
622 if (!getenv("GIT_HTTP_EXPORT_ALL") &&
623 access("git-daemon-export-ok", F_OK) )
624 not_found("Repository not exported: '%s'", dir);
2f4038ab 625
6881f0cc 626 http_config();
2f4038ab
SP
627 cmd->imp(cmd_arg);
628 return 0;
629}