run-command: add env_array, an optional argv_array for env
[git/git.git] / http-backend.c
CommitLineData
2f4038ab
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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
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
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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);
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);
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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)
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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{
cdf4fb8e 114 write_or_die(1, "\r\n", 2);
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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
5abb013b
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();
cdf4fb8e 160 write_or_die(1, buf->buf, buf->len);
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SP
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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SP
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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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);
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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);
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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);
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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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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
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);
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SP
235 }
236
6881f0cc 237 strbuf_release(&var);
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SP
238}
239
240static struct rpc_service *select_service(const char *name)
241{
ae021d87 242 const char *svc_name;
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SP
243 struct rpc_service *svc = NULL;
244 int i;
245
ae021d87 246 if (!skip_prefix(name, "git-", &svc_name))
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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)) {
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252 svc = s;
253 break;
254 }
255 }
256
257 if (!svc)
258 forbidden("Unsupported service: '%s'", name);
259
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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;
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SP
272 unsigned char in_buf[8192];
273 unsigned char out_buf[8192];
274 unsigned long cnt = 0;
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SP
275
276 memset(&stream, 0, sizeof(stream));
5e86c1fb 277 git_inflate_init_gzip_only(&stream);
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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);
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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);
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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");
e32a4581 317 struct argv_array env = ARGV_ARRAY_INIT;
556cfa3b 318 int gzipped_request = 0;
d3180279 319 struct child_process cld = CHILD_PROCESS_INIT;
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SP
320
321 if (encoding && !strcmp(encoding, "gzip"))
322 gzipped_request = 1;
323 else if (encoding && !strcmp(encoding, "x-gzip"))
324 gzipped_request = 1;
325
326 if (!user || !*user)
327 user = "anonymous";
328 if (!host || !*host)
329 host = "(none)";
330
e32a4581
JK
331 if (!getenv("GIT_COMMITTER_NAME"))
332 argv_array_pushf(&env, "GIT_COMMITTER_NAME=%s", user);
333 if (!getenv("GIT_COMMITTER_EMAIL"))
334 argv_array_pushf(&env, "GIT_COMMITTER_EMAIL=%s@http.%s",
335 user, host);
556cfa3b 336
556cfa3b 337 cld.argv = argv;
e32a4581 338 cld.env = env.argv;
556cfa3b
SP
339 if (gzipped_request)
340 cld.in = -1;
341 cld.git_cmd = 1;
342 if (start_command(&cld))
343 exit(1);
344
345 close(1);
346 if (gzipped_request)
347 inflate_request(argv[0], cld.in);
348 else
349 close(0);
350
351 if (finish_command(&cld))
352 exit(1);
e32a4581 353 argv_array_clear(&env);
556cfa3b
SP
354}
355
2f4038ab
SP
356static int show_text_ref(const char *name, const unsigned char *sha1,
357 int flag, void *cb_data)
358{
6130f86d 359 const char *name_nons = strip_namespace(name);
2f4038ab
SP
360 struct strbuf *buf = cb_data;
361 struct object *o = parse_object(sha1);
362 if (!o)
363 return 0;
364
6130f86d 365 strbuf_addf(buf, "%s\t%s\n", sha1_to_hex(sha1), name_nons);
2f4038ab
SP
366 if (o->type == OBJ_TAG) {
367 o = deref_tag(o, name, 0);
368 if (!o)
369 return 0;
6130f86d
JK
370 strbuf_addf(buf, "%s\t%s^{}\n", sha1_to_hex(o->sha1),
371 name_nons);
2f4038ab
SP
372 }
373 return 0;
374}
375
376static void get_info_refs(char *arg)
377{
556cfa3b 378 const char *service_name = get_parameter("service");
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SP
379 struct strbuf buf = STRBUF_INIT;
380
2f4038ab 381 hdr_nocache();
556cfa3b
SP
382
383 if (service_name) {
384 const char *argv[] = {NULL /* service name */,
385 "--stateless-rpc", "--advertise-refs",
386 ".", NULL};
387 struct rpc_service *svc = select_service(service_name);
388
389 strbuf_addf(&buf, "application/x-git-%s-advertisement",
390 svc->name);
391 hdr_str(content_type, buf.buf);
392 end_headers();
393
394 packet_write(1, "# service=git-%s\n", svc->name);
395 packet_flush(1);
396
397 argv[0] = svc->name;
398 run_service(argv);
399
400 } else {
5abb013b 401 select_getanyfile();
6130f86d 402 for_each_namespaced_ref(show_text_ref, &buf);
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];
3e4ca43f 415 const char *target = resolve_ref_unsafe(refname, unused, 1, NULL);
6130f86d
JK
416 const char *target_nons = strip_namespace(target);
417
418 strbuf_addf(buf, "ref: %s\n", target_nons);
419 } else {
420 strbuf_addf(buf, "%s\n", sha1_to_hex(sha1));
421 }
422
423 return 0;
424}
425
426static void get_head(char *arg)
427{
428 struct strbuf buf = STRBUF_INIT;
429
430 select_getanyfile();
431 head_ref_namespaced(show_head_ref, &buf);
432 send_strbuf("text/plain", &buf);
433 strbuf_release(&buf);
434}
435
2f4038ab
SP
436static void get_info_packs(char *arg)
437{
438 size_t objdirlen = strlen(get_object_directory());
439 struct strbuf buf = STRBUF_INIT;
440 struct packed_git *p;
441 size_t cnt = 0;
442
5abb013b 443 select_getanyfile();
2f4038ab
SP
444 prepare_packed_git();
445 for (p = packed_git; p; p = p->next) {
446 if (p->pack_local)
447 cnt++;
448 }
449
450 strbuf_grow(&buf, cnt * 53 + 2);
451 for (p = packed_git; p; p = p->next) {
452 if (p->pack_local)
453 strbuf_addf(&buf, "P %s\n", p->pack_name + objdirlen + 6);
454 }
455 strbuf_addch(&buf, '\n');
456
457 hdr_nocache();
458 send_strbuf("text/plain; charset=utf-8", &buf);
459 strbuf_release(&buf);
460}
461
556cfa3b
SP
462static void check_content_type(const char *accepted_type)
463{
464 const char *actual_type = getenv("CONTENT_TYPE");
465
466 if (!actual_type)
467 actual_type = "";
468
469 if (strcmp(actual_type, accepted_type)) {
470 http_status(415, "Unsupported Media Type");
471 hdr_nocache();
472 end_headers();
473 format_write(1,
474 "Expected POST with Content-Type '%s',"
475 " but received '%s' instead.\n",
476 accepted_type, actual_type);
477 exit(0);
478 }
479}
480
481static void service_rpc(char *service_name)
482{
483 const char *argv[] = {NULL, "--stateless-rpc", ".", NULL};
484 struct rpc_service *svc = select_service(service_name);
485 struct strbuf buf = STRBUF_INIT;
486
487 strbuf_reset(&buf);
488 strbuf_addf(&buf, "application/x-git-%s-request", svc->name);
489 check_content_type(buf.buf);
490
491 hdr_nocache();
492
493 strbuf_reset(&buf);
494 strbuf_addf(&buf, "application/x-git-%s-result", svc->name);
495 hdr_str(content_type, buf.buf);
496
497 end_headers();
498
499 argv[0] = svc->name;
500 run_service(argv);
501 strbuf_release(&buf);
502}
503
2f4038ab
SP
504static NORETURN void die_webcgi(const char *err, va_list params)
505{
5856b5f5 506 static int dead;
2f4038ab 507
5856b5f5 508 if (!dead) {
5856b5f5 509 dead = 1;
5856b5f5
SP
510 http_status(500, "Internal Server Error");
511 hdr_nocache();
512 end_headers();
76265501
JH
513
514 vreportf("fatal: ", err, params);
5856b5f5
SP
515 }
516 exit(0); /* we successfully reported a failure ;-) */
2f4038ab
SP
517}
518
917adc03
ML
519static char* getdir(void)
520{
521 struct strbuf buf = STRBUF_INIT;
522 char *pathinfo = getenv("PATH_INFO");
523 char *root = getenv("GIT_PROJECT_ROOT");
524 char *path = getenv("PATH_TRANSLATED");
525
526 if (root && *root) {
527 if (!pathinfo || !*pathinfo)
528 die("GIT_PROJECT_ROOT is set but PATH_INFO is not");
34b6cb8b
SP
529 if (daemon_avoid_alias(pathinfo))
530 die("'%s': aliased", pathinfo);
cf688cc2 531 end_url_with_slash(&buf, root);
34b6cb8b
SP
532 if (pathinfo[0] == '/')
533 pathinfo++;
917adc03
ML
534 strbuf_addstr(&buf, pathinfo);
535 return strbuf_detach(&buf, NULL);
536 } else if (path && *path) {
537 return xstrdup(path);
538 } else
539 die("No GIT_PROJECT_ROOT or PATH_TRANSLATED from server");
540 return NULL;
541}
542
2f4038ab
SP
543static struct service_cmd {
544 const char *method;
545 const char *pattern;
546 void (*imp)(char *);
547} services[] = {
6130f86d 548 {"GET", "/HEAD$", get_head},
2f4038ab
SP
549 {"GET", "/info/refs$", get_info_refs},
550 {"GET", "/objects/info/alternates$", get_text_file},
551 {"GET", "/objects/info/http-alternates$", get_text_file},
552 {"GET", "/objects/info/packs$", get_info_packs},
553 {"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{38}$", get_loose_object},
554 {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.pack$", get_pack_file},
556cfa3b
SP
555 {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.idx$", get_idx_file},
556
557 {"POST", "/git-upload-pack$", service_rpc},
558 {"POST", "/git-receive-pack$", service_rpc}
2f4038ab
SP
559};
560
561int main(int argc, char **argv)
562{
563 char *method = getenv("REQUEST_METHOD");
917adc03 564 char *dir;
2f4038ab
SP
565 struct service_cmd *cmd = NULL;
566 char *cmd_arg = NULL;
567 int i;
568
5e9637c6
ÆAB
569 git_setup_gettext();
570
2f4038ab
SP
571 git_extract_argv0_path(argv[0]);
572 set_die_routine(die_webcgi);
573
574 if (!method)
575 die("No REQUEST_METHOD from server");
576 if (!strcmp(method, "HEAD"))
577 method = "GET";
917adc03 578 dir = getdir();
2f4038ab
SP
579
580 for (i = 0; i < ARRAY_SIZE(services); i++) {
581 struct service_cmd *c = &services[i];
582 regex_t re;
583 regmatch_t out[1];
584
585 if (regcomp(&re, c->pattern, REG_EXTENDED))
586 die("Bogus regex in service table: %s", c->pattern);
587 if (!regexec(&re, dir, 1, out, 0)) {
48aec1b1 588 size_t n;
2f4038ab
SP
589
590 if (strcmp(method, c->method)) {
591 const char *proto = getenv("SERVER_PROTOCOL");
9247be05 592 if (proto && !strcmp(proto, "HTTP/1.1")) {
2f4038ab 593 http_status(405, "Method Not Allowed");
9247be05 594 hdr_str("Allow", !strcmp(c->method, "GET") ?
595 "GET, HEAD" : c->method);
596 } else
2f4038ab
SP
597 http_status(400, "Bad Request");
598 hdr_nocache();
599 end_headers();
600 return 0;
601 }
602
603 cmd = c;
48aec1b1 604 n = out[0].rm_eo - out[0].rm_so;
5c0b13f8 605 cmd_arg = xmemdupz(dir + out[0].rm_so + 1, n - 1);
2f4038ab
SP
606 dir[out[0].rm_so] = 0;
607 break;
608 }
609 regfree(&re);
610 }
611
612 if (!cmd)
613 not_found("Request not supported: '%s'", dir);
614
615 setup_path();
616 if (!enter_repo(dir, 0))
617 not_found("Not a git repository: '%s'", dir);
8b2bd7cd
TC
618 if (!getenv("GIT_HTTP_EXPORT_ALL") &&
619 access("git-daemon-export-ok", F_OK) )
620 not_found("Repository not exported: '%s'", dir);
2f4038ab 621
6881f0cc 622 http_config();
2f4038ab
SP
623 cmd->imp(cmd_arg);
624 return 0;
625}