pkt-line: move a misplaced comment
[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;
2f4038ab 16
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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
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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) {
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37 char *name = url_decode_parameter_name(&query);
38 char *value = url_decode_parameter_value(&query);
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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);
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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);
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56 return i ? i->util : NULL;
57}
58
35487017 59__attribute__((format (printf, 2, 3)))
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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
73 safe_write(fd, buffer, n);
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)
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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{
114 safe_write(1, "\r\n", 2);
115}
116
35487017 117__attribute__((format (printf, 1, 2)))
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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)))
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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
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SP
149static void select_getanyfile(void)
150{
151 if (!getanyfile)
152 forbidden("Unsupported service: getanyfile");
153}
154
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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();
160 safe_write(1, buf->buf, buf->len);
161}
162
92815b33 163static void send_local_file(const char *the_type, const char *name)
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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;
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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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178 hdr_str(content_type, the_type);
179 hdr_date(last_modified, sb.st_mtime);
180 end_headers();
181
4a5328d6 182 for (;;) {
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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;
188 safe_write(1, buf, n);
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);
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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);
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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);
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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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220}
221
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222static int http_config(const char *var, const char *value, void *cb)
223{
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SP
224 if (!strcmp(var, "http.getanyfile")) {
225 getanyfile = git_config_bool(var, value);
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226 return 0;
227 }
228
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229 if (!prefixcmp(var, "http.")) {
230 int i;
231
232 for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
233 struct rpc_service *svc = &rpc_service[i];
234 if (!strcmp(var + 5, svc->config_name)) {
235 svc->enabled = git_config_bool(var, value);
236 return 0;
237 }
238 }
239 }
240
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SP
241 /* we are not interested in parsing any other configuration here */
242 return 0;
243}
244
245static struct rpc_service *select_service(const char *name)
246{
247 struct rpc_service *svc = NULL;
248 int i;
249
250 if (prefixcmp(name, "git-"))
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];
255 if (!strcmp(s->name, name + 4)) {
256 svc = s;
257 break;
258 }
259 }
260
261 if (!svc)
262 forbidden("Unsupported service: '%s'", name);
263
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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
273static void inflate_request(const char *prog_name, int out)
274{
ef49a7a0 275 git_zstream stream;
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276 unsigned char in_buf[8192];
277 unsigned char out_buf[8192];
278 unsigned long cnt = 0;
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279
280 memset(&stream, 0, sizeof(stream));
5e86c1fb 281 git_inflate_init_gzip_only(&stream);
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282
283 while (1) {
284 ssize_t n = xread(0, in_buf, sizeof(in_buf));
285 if (n <= 0)
286 die("request ended in the middle of the gzip stream");
287
288 stream.next_in = in_buf;
289 stream.avail_in = n;
290
291 while (0 < stream.avail_in) {
292 int ret;
293
294 stream.next_out = out_buf;
295 stream.avail_out = sizeof(out_buf);
296
9e7e5ca3 297 ret = git_inflate(&stream, Z_NO_FLUSH);
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SP
298 if (ret != Z_OK && ret != Z_STREAM_END)
299 die("zlib error inflating request, result %d", ret);
300
301 n = stream.total_out - cnt;
302 if (write_in_full(out, out_buf, n) != n)
303 die("%s aborted reading request", prog_name);
304 cnt += n;
305
306 if (ret == Z_STREAM_END)
307 goto done;
308 }
309 }
310
311done:
9e7e5ca3 312 git_inflate_end(&stream);
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313 close(out);
314}
315
316static void run_service(const char **argv)
317{
318 const char *encoding = getenv("HTTP_CONTENT_ENCODING");
319 const char *user = getenv("REMOTE_USER");
320 const char *host = getenv("REMOTE_ADDR");
e32a4581 321 struct argv_array env = ARGV_ARRAY_INIT;
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SP
322 int gzipped_request = 0;
323 struct child_process cld;
324
325 if (encoding && !strcmp(encoding, "gzip"))
326 gzipped_request = 1;
327 else if (encoding && !strcmp(encoding, "x-gzip"))
328 gzipped_request = 1;
329
330 if (!user || !*user)
331 user = "anonymous";
332 if (!host || !*host)
333 host = "(none)";
334
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JK
335 if (!getenv("GIT_COMMITTER_NAME"))
336 argv_array_pushf(&env, "GIT_COMMITTER_NAME=%s", user);
337 if (!getenv("GIT_COMMITTER_EMAIL"))
338 argv_array_pushf(&env, "GIT_COMMITTER_EMAIL=%s@http.%s",
339 user, host);
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340
341 memset(&cld, 0, sizeof(cld));
342 cld.argv = argv;
e32a4581 343 cld.env = env.argv;
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SP
344 if (gzipped_request)
345 cld.in = -1;
346 cld.git_cmd = 1;
347 if (start_command(&cld))
348 exit(1);
349
350 close(1);
351 if (gzipped_request)
352 inflate_request(argv[0], cld.in);
353 else
354 close(0);
355
356 if (finish_command(&cld))
357 exit(1);
e32a4581 358 argv_array_clear(&env);
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SP
359}
360
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361static int show_text_ref(const char *name, const unsigned char *sha1,
362 int flag, void *cb_data)
363{
364 struct strbuf *buf = cb_data;
365 struct object *o = parse_object(sha1);
366 if (!o)
367 return 0;
368
369 strbuf_addf(buf, "%s\t%s\n", sha1_to_hex(sha1), name);
370 if (o->type == OBJ_TAG) {
371 o = deref_tag(o, name, 0);
372 if (!o)
373 return 0;
374 strbuf_addf(buf, "%s\t%s^{}\n", sha1_to_hex(o->sha1), name);
375 }
376 return 0;
377}
378
379static void get_info_refs(char *arg)
380{
556cfa3b 381 const char *service_name = get_parameter("service");
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SP
382 struct strbuf buf = STRBUF_INIT;
383
2f4038ab 384 hdr_nocache();
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SP
385
386 if (service_name) {
387 const char *argv[] = {NULL /* service name */,
388 "--stateless-rpc", "--advertise-refs",
389 ".", NULL};
390 struct rpc_service *svc = select_service(service_name);
391
392 strbuf_addf(&buf, "application/x-git-%s-advertisement",
393 svc->name);
394 hdr_str(content_type, buf.buf);
395 end_headers();
396
397 packet_write(1, "# service=git-%s\n", svc->name);
398 packet_flush(1);
399
400 argv[0] = svc->name;
401 run_service(argv);
402
403 } else {
5abb013b 404 select_getanyfile();
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SP
405 for_each_ref(show_text_ref, &buf);
406 send_strbuf("text/plain", &buf);
407 }
2f4038ab
SP
408 strbuf_release(&buf);
409}
410
411static void get_info_packs(char *arg)
412{
413 size_t objdirlen = strlen(get_object_directory());
414 struct strbuf buf = STRBUF_INIT;
415 struct packed_git *p;
416 size_t cnt = 0;
417
5abb013b 418 select_getanyfile();
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SP
419 prepare_packed_git();
420 for (p = packed_git; p; p = p->next) {
421 if (p->pack_local)
422 cnt++;
423 }
424
425 strbuf_grow(&buf, cnt * 53 + 2);
426 for (p = packed_git; p; p = p->next) {
427 if (p->pack_local)
428 strbuf_addf(&buf, "P %s\n", p->pack_name + objdirlen + 6);
429 }
430 strbuf_addch(&buf, '\n');
431
432 hdr_nocache();
433 send_strbuf("text/plain; charset=utf-8", &buf);
434 strbuf_release(&buf);
435}
436
556cfa3b
SP
437static void check_content_type(const char *accepted_type)
438{
439 const char *actual_type = getenv("CONTENT_TYPE");
440
441 if (!actual_type)
442 actual_type = "";
443
444 if (strcmp(actual_type, accepted_type)) {
445 http_status(415, "Unsupported Media Type");
446 hdr_nocache();
447 end_headers();
448 format_write(1,
449 "Expected POST with Content-Type '%s',"
450 " but received '%s' instead.\n",
451 accepted_type, actual_type);
452 exit(0);
453 }
454}
455
456static void service_rpc(char *service_name)
457{
458 const char *argv[] = {NULL, "--stateless-rpc", ".", NULL};
459 struct rpc_service *svc = select_service(service_name);
460 struct strbuf buf = STRBUF_INIT;
461
462 strbuf_reset(&buf);
463 strbuf_addf(&buf, "application/x-git-%s-request", svc->name);
464 check_content_type(buf.buf);
465
466 hdr_nocache();
467
468 strbuf_reset(&buf);
469 strbuf_addf(&buf, "application/x-git-%s-result", svc->name);
470 hdr_str(content_type, buf.buf);
471
472 end_headers();
473
474 argv[0] = svc->name;
475 run_service(argv);
476 strbuf_release(&buf);
477}
478
2f4038ab
SP
479static NORETURN void die_webcgi(const char *err, va_list params)
480{
5856b5f5 481 static int dead;
2f4038ab 482
5856b5f5 483 if (!dead) {
5856b5f5 484 dead = 1;
5856b5f5
SP
485 http_status(500, "Internal Server Error");
486 hdr_nocache();
487 end_headers();
76265501
JH
488
489 vreportf("fatal: ", err, params);
5856b5f5
SP
490 }
491 exit(0); /* we successfully reported a failure ;-) */
2f4038ab
SP
492}
493
917adc03
ML
494static char* getdir(void)
495{
496 struct strbuf buf = STRBUF_INIT;
497 char *pathinfo = getenv("PATH_INFO");
498 char *root = getenv("GIT_PROJECT_ROOT");
499 char *path = getenv("PATH_TRANSLATED");
500
501 if (root && *root) {
502 if (!pathinfo || !*pathinfo)
503 die("GIT_PROJECT_ROOT is set but PATH_INFO is not");
34b6cb8b
SP
504 if (daemon_avoid_alias(pathinfo))
505 die("'%s': aliased", pathinfo);
cf688cc2 506 end_url_with_slash(&buf, root);
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SP
507 if (pathinfo[0] == '/')
508 pathinfo++;
917adc03
ML
509 strbuf_addstr(&buf, pathinfo);
510 return strbuf_detach(&buf, NULL);
511 } else if (path && *path) {
512 return xstrdup(path);
513 } else
514 die("No GIT_PROJECT_ROOT or PATH_TRANSLATED from server");
515 return NULL;
516}
517
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SP
518static struct service_cmd {
519 const char *method;
520 const char *pattern;
521 void (*imp)(char *);
522} services[] = {
523 {"GET", "/HEAD$", get_text_file},
524 {"GET", "/info/refs$", get_info_refs},
525 {"GET", "/objects/info/alternates$", get_text_file},
526 {"GET", "/objects/info/http-alternates$", get_text_file},
527 {"GET", "/objects/info/packs$", get_info_packs},
528 {"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{38}$", get_loose_object},
529 {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.pack$", get_pack_file},
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SP
530 {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.idx$", get_idx_file},
531
532 {"POST", "/git-upload-pack$", service_rpc},
533 {"POST", "/git-receive-pack$", service_rpc}
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SP
534};
535
536int main(int argc, char **argv)
537{
538 char *method = getenv("REQUEST_METHOD");
917adc03 539 char *dir;
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SP
540 struct service_cmd *cmd = NULL;
541 char *cmd_arg = NULL;
542 int i;
543
5e9637c6
ÆAB
544 git_setup_gettext();
545
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SP
546 git_extract_argv0_path(argv[0]);
547 set_die_routine(die_webcgi);
548
549 if (!method)
550 die("No REQUEST_METHOD from server");
551 if (!strcmp(method, "HEAD"))
552 method = "GET";
917adc03 553 dir = getdir();
2f4038ab
SP
554
555 for (i = 0; i < ARRAY_SIZE(services); i++) {
556 struct service_cmd *c = &services[i];
557 regex_t re;
558 regmatch_t out[1];
559
560 if (regcomp(&re, c->pattern, REG_EXTENDED))
561 die("Bogus regex in service table: %s", c->pattern);
562 if (!regexec(&re, dir, 1, out, 0)) {
48aec1b1 563 size_t n;
2f4038ab
SP
564
565 if (strcmp(method, c->method)) {
566 const char *proto = getenv("SERVER_PROTOCOL");
567 if (proto && !strcmp(proto, "HTTP/1.1"))
568 http_status(405, "Method Not Allowed");
569 else
570 http_status(400, "Bad Request");
571 hdr_nocache();
572 end_headers();
573 return 0;
574 }
575
576 cmd = c;
48aec1b1 577 n = out[0].rm_eo - out[0].rm_so;
2f4038ab 578 cmd_arg = xmalloc(n);
48aec1b1
TC
579 memcpy(cmd_arg, dir + out[0].rm_so + 1, n-1);
580 cmd_arg[n-1] = '\0';
2f4038ab
SP
581 dir[out[0].rm_so] = 0;
582 break;
583 }
584 regfree(&re);
585 }
586
587 if (!cmd)
588 not_found("Request not supported: '%s'", dir);
589
590 setup_path();
591 if (!enter_repo(dir, 0))
592 not_found("Not a git repository: '%s'", dir);
8b2bd7cd
TC
593 if (!getenv("GIT_HTTP_EXPORT_ALL") &&
594 access("git-daemon-export-ok", F_OK) )
595 not_found("Repository not exported: '%s'", dir);
2f4038ab 596
5abb013b 597 git_config(http_config, NULL);
2f4038ab
SP
598 cmd->imp(cmd_arg);
599 return 0;
600}