Code

Merge branch 'jk/tag-contains-ab' (early part) into maint
[git.git] / http-backend.c
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"
7 #include "run-command.h"
8 #include "string-list.h"
9 #include "url.h"
11 static const char content_type[] = "Content-Type";
12 static const char content_length[] = "Content-Length";
13 static const char last_modified[] = "Last-Modified";
14 static int getanyfile = 1;
16 static struct string_list *query_params;
18 struct rpc_service {
19         const char *name;
20         const char *config_name;
21         signed enabled : 2;
22 };
24 static struct rpc_service rpc_service[] = {
25         { "upload-pack", "uploadpack", 1 },
26         { "receive-pack", "receivepack", -1 },
27 };
29 static struct string_list *get_parameters(void)
30 {
31         if (!query_params) {
32                 const char *query = getenv("QUERY_STRING");
34                 query_params = xcalloc(1, sizeof(*query_params));
35                 while (query && *query) {
36                         char *name = url_decode_parameter_name(&query);
37                         char *value = url_decode_parameter_value(&query);
38                         struct string_list_item *i;
40                         i = string_list_lookup(query_params, name);
41                         if (!i)
42                                 i = string_list_insert(query_params, name);
43                         else
44                                 free(i->util);
45                         i->util = value;
46                 }
47         }
48         return query_params;
49 }
51 static const char *get_parameter(const char *name)
52 {
53         struct string_list_item *i;
54         i = string_list_lookup(get_parameters(), name);
55         return i ? i->util : NULL;
56 }
58 __attribute__((format (printf, 2, 3)))
59 static void format_write(int fd, const char *fmt, ...)
60 {
61         static char buffer[1024];
63         va_list args;
64         unsigned n;
66         va_start(args, fmt);
67         n = vsnprintf(buffer, sizeof(buffer), fmt, args);
68         va_end(args);
69         if (n >= sizeof(buffer))
70                 die("protocol error: impossibly long line");
72         safe_write(fd, buffer, n);
73 }
75 static void http_status(unsigned code, const char *msg)
76 {
77         format_write(1, "Status: %u %s\r\n", code, msg);
78 }
80 static void hdr_str(const char *name, const char *value)
81 {
82         format_write(1, "%s: %s\r\n", name, value);
83 }
85 static void hdr_int(const char *name, uintmax_t value)
86 {
87         format_write(1, "%s: %" PRIuMAX "\r\n", name, value);
88 }
90 static void hdr_date(const char *name, unsigned long when)
91 {
92         const char *value = show_date(when, 0, DATE_RFC2822);
93         hdr_str(name, value);
94 }
96 static void hdr_nocache(void)
97 {
98         hdr_str("Expires", "Fri, 01 Jan 1980 00:00:00 GMT");
99         hdr_str("Pragma", "no-cache");
100         hdr_str("Cache-Control", "no-cache, max-age=0, must-revalidate");
103 static void hdr_cache_forever(void)
105         unsigned long now = time(NULL);
106         hdr_date("Date", now);
107         hdr_date("Expires", now + 31536000);
108         hdr_str("Cache-Control", "public, max-age=31536000");
111 static void end_headers(void)
113         safe_write(1, "\r\n", 2);
116 __attribute__((format (printf, 1, 2)))
117 static NORETURN void not_found(const char *err, ...)
119         va_list params;
121         http_status(404, "Not Found");
122         hdr_nocache();
123         end_headers();
125         va_start(params, err);
126         if (err && *err)
127                 vfprintf(stderr, err, params);
128         va_end(params);
129         exit(0);
132 __attribute__((format (printf, 1, 2)))
133 static NORETURN void forbidden(const char *err, ...)
135         va_list params;
137         http_status(403, "Forbidden");
138         hdr_nocache();
139         end_headers();
141         va_start(params, err);
142         if (err && *err)
143                 vfprintf(stderr, err, params);
144         va_end(params);
145         exit(0);
148 static void select_getanyfile(void)
150         if (!getanyfile)
151                 forbidden("Unsupported service: getanyfile");
154 static void send_strbuf(const char *type, struct strbuf *buf)
156         hdr_int(content_length, buf->len);
157         hdr_str(content_type, type);
158         end_headers();
159         safe_write(1, buf->buf, buf->len);
162 static void send_local_file(const char *the_type, const char *name)
164         const char *p = git_path("%s", name);
165         size_t buf_alloc = 8192;
166         char *buf = xmalloc(buf_alloc);
167         int fd;
168         struct stat sb;
170         fd = open(p, O_RDONLY);
171         if (fd < 0)
172                 not_found("Cannot open '%s': %s", p, strerror(errno));
173         if (fstat(fd, &sb) < 0)
174                 die_errno("Cannot stat '%s'", p);
176         hdr_int(content_length, sb.st_size);
177         hdr_str(content_type, the_type);
178         hdr_date(last_modified, sb.st_mtime);
179         end_headers();
181         for (;;) {
182                 ssize_t n = xread(fd, buf, buf_alloc);
183                 if (n < 0)
184                         die_errno("Cannot read '%s'", p);
185                 if (!n)
186                         break;
187                 safe_write(1, buf, n);
188         }
189         close(fd);
190         free(buf);
193 static void get_text_file(char *name)
195         select_getanyfile();
196         hdr_nocache();
197         send_local_file("text/plain", name);
200 static void get_loose_object(char *name)
202         select_getanyfile();
203         hdr_cache_forever();
204         send_local_file("application/x-git-loose-object", name);
207 static void get_pack_file(char *name)
209         select_getanyfile();
210         hdr_cache_forever();
211         send_local_file("application/x-git-packed-objects", name);
214 static void get_idx_file(char *name)
216         select_getanyfile();
217         hdr_cache_forever();
218         send_local_file("application/x-git-packed-objects-toc", name);
221 static int http_config(const char *var, const char *value, void *cb)
223         if (!strcmp(var, "http.getanyfile")) {
224                 getanyfile = git_config_bool(var, value);
225                 return 0;
226         }
228         if (!prefixcmp(var, "http.")) {
229                 int i;
231                 for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
232                         struct rpc_service *svc = &rpc_service[i];
233                         if (!strcmp(var + 5, svc->config_name)) {
234                                 svc->enabled = git_config_bool(var, value);
235                                 return 0;
236                         }
237                 }
238         }
240         /* we are not interested in parsing any other configuration here */
241         return 0;
244 static struct rpc_service *select_service(const char *name)
246         struct rpc_service *svc = NULL;
247         int i;
249         if (prefixcmp(name, "git-"))
250                 forbidden("Unsupported service: '%s'", name);
252         for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
253                 struct rpc_service *s = &rpc_service[i];
254                 if (!strcmp(s->name, name + 4)) {
255                         svc = s;
256                         break;
257                 }
258         }
260         if (!svc)
261                 forbidden("Unsupported service: '%s'", name);
263         if (svc->enabled < 0) {
264                 const char *user = getenv("REMOTE_USER");
265                 svc->enabled = (user && *user) ? 1 : 0;
266         }
267         if (!svc->enabled)
268                 forbidden("Service not enabled: '%s'", svc->name);
269         return svc;
272 static void inflate_request(const char *prog_name, int out)
274         git_zstream stream;
275         unsigned char in_buf[8192];
276         unsigned char out_buf[8192];
277         unsigned long cnt = 0;
279         memset(&stream, 0, sizeof(stream));
280         git_inflate_init_gzip_only(&stream);
282         while (1) {
283                 ssize_t n = xread(0, in_buf, sizeof(in_buf));
284                 if (n <= 0)
285                         die("request ended in the middle of the gzip stream");
287                 stream.next_in = in_buf;
288                 stream.avail_in = n;
290                 while (0 < stream.avail_in) {
291                         int ret;
293                         stream.next_out = out_buf;
294                         stream.avail_out = sizeof(out_buf);
296                         ret = git_inflate(&stream, Z_NO_FLUSH);
297                         if (ret != Z_OK && ret != Z_STREAM_END)
298                                 die("zlib error inflating request, result %d", ret);
300                         n = stream.total_out - cnt;
301                         if (write_in_full(out, out_buf, n) != n)
302                                 die("%s aborted reading request", prog_name);
303                         cnt += n;
305                         if (ret == Z_STREAM_END)
306                                 goto done;
307                 }
308         }
310 done:
311         git_inflate_end(&stream);
312         close(out);
315 static void run_service(const char **argv)
317         const char *encoding = getenv("HTTP_CONTENT_ENCODING");
318         const char *user = getenv("REMOTE_USER");
319         const char *host = getenv("REMOTE_ADDR");
320         char *env[3];
321         struct strbuf buf = STRBUF_INIT;
322         int gzipped_request = 0;
323         struct child_process cld;
325         if (encoding && !strcmp(encoding, "gzip"))
326                 gzipped_request = 1;
327         else if (encoding && !strcmp(encoding, "x-gzip"))
328                 gzipped_request = 1;
330         if (!user || !*user)
331                 user = "anonymous";
332         if (!host || !*host)
333                 host = "(none)";
335         memset(&env, 0, sizeof(env));
336         strbuf_addf(&buf, "GIT_COMMITTER_NAME=%s", user);
337         env[0] = strbuf_detach(&buf, NULL);
339         strbuf_addf(&buf, "GIT_COMMITTER_EMAIL=%s@http.%s", user, host);
340         env[1] = strbuf_detach(&buf, NULL);
341         env[2] = NULL;
343         memset(&cld, 0, sizeof(cld));
344         cld.argv = argv;
345         cld.env = (const char *const *)env;
346         if (gzipped_request)
347                 cld.in = -1;
348         cld.git_cmd = 1;
349         if (start_command(&cld))
350                 exit(1);
352         close(1);
353         if (gzipped_request)
354                 inflate_request(argv[0], cld.in);
355         else
356                 close(0);
358         if (finish_command(&cld))
359                 exit(1);
360         free(env[0]);
361         free(env[1]);
362         strbuf_release(&buf);
365 static int show_text_ref(const char *name, const unsigned char *sha1,
366         int flag, void *cb_data)
368         struct strbuf *buf = cb_data;
369         struct object *o = parse_object(sha1);
370         if (!o)
371                 return 0;
373         strbuf_addf(buf, "%s\t%s\n", sha1_to_hex(sha1), name);
374         if (o->type == OBJ_TAG) {
375                 o = deref_tag(o, name, 0);
376                 if (!o)
377                         return 0;
378                 strbuf_addf(buf, "%s\t%s^{}\n", sha1_to_hex(o->sha1), name);
379         }
380         return 0;
383 static void get_info_refs(char *arg)
385         const char *service_name = get_parameter("service");
386         struct strbuf buf = STRBUF_INIT;
388         hdr_nocache();
390         if (service_name) {
391                 const char *argv[] = {NULL /* service name */,
392                         "--stateless-rpc", "--advertise-refs",
393                         ".", NULL};
394                 struct rpc_service *svc = select_service(service_name);
396                 strbuf_addf(&buf, "application/x-git-%s-advertisement",
397                         svc->name);
398                 hdr_str(content_type, buf.buf);
399                 end_headers();
401                 packet_write(1, "# service=git-%s\n", svc->name);
402                 packet_flush(1);
404                 argv[0] = svc->name;
405                 run_service(argv);
407         } else {
408                 select_getanyfile();
409                 for_each_ref(show_text_ref, &buf);
410                 send_strbuf("text/plain", &buf);
411         }
412         strbuf_release(&buf);
415 static void get_info_packs(char *arg)
417         size_t objdirlen = strlen(get_object_directory());
418         struct strbuf buf = STRBUF_INIT;
419         struct packed_git *p;
420         size_t cnt = 0;
422         select_getanyfile();
423         prepare_packed_git();
424         for (p = packed_git; p; p = p->next) {
425                 if (p->pack_local)
426                         cnt++;
427         }
429         strbuf_grow(&buf, cnt * 53 + 2);
430         for (p = packed_git; p; p = p->next) {
431                 if (p->pack_local)
432                         strbuf_addf(&buf, "P %s\n", p->pack_name + objdirlen + 6);
433         }
434         strbuf_addch(&buf, '\n');
436         hdr_nocache();
437         send_strbuf("text/plain; charset=utf-8", &buf);
438         strbuf_release(&buf);
441 static void check_content_type(const char *accepted_type)
443         const char *actual_type = getenv("CONTENT_TYPE");
445         if (!actual_type)
446                 actual_type = "";
448         if (strcmp(actual_type, accepted_type)) {
449                 http_status(415, "Unsupported Media Type");
450                 hdr_nocache();
451                 end_headers();
452                 format_write(1,
453                         "Expected POST with Content-Type '%s',"
454                         " but received '%s' instead.\n",
455                         accepted_type, actual_type);
456                 exit(0);
457         }
460 static void service_rpc(char *service_name)
462         const char *argv[] = {NULL, "--stateless-rpc", ".", NULL};
463         struct rpc_service *svc = select_service(service_name);
464         struct strbuf buf = STRBUF_INIT;
466         strbuf_reset(&buf);
467         strbuf_addf(&buf, "application/x-git-%s-request", svc->name);
468         check_content_type(buf.buf);
470         hdr_nocache();
472         strbuf_reset(&buf);
473         strbuf_addf(&buf, "application/x-git-%s-result", svc->name);
474         hdr_str(content_type, buf.buf);
476         end_headers();
478         argv[0] = svc->name;
479         run_service(argv);
480         strbuf_release(&buf);
483 static NORETURN void die_webcgi(const char *err, va_list params)
485         static int dead;
487         if (!dead) {
488                 dead = 1;
489                 http_status(500, "Internal Server Error");
490                 hdr_nocache();
491                 end_headers();
493                 vreportf("fatal: ", err, params);
494         }
495         exit(0); /* we successfully reported a failure ;-) */
498 static char* getdir(void)
500         struct strbuf buf = STRBUF_INIT;
501         char *pathinfo = getenv("PATH_INFO");
502         char *root = getenv("GIT_PROJECT_ROOT");
503         char *path = getenv("PATH_TRANSLATED");
505         if (root && *root) {
506                 if (!pathinfo || !*pathinfo)
507                         die("GIT_PROJECT_ROOT is set but PATH_INFO is not");
508                 if (daemon_avoid_alias(pathinfo))
509                         die("'%s': aliased", pathinfo);
510                 end_url_with_slash(&buf, root);
511                 if (pathinfo[0] == '/')
512                         pathinfo++;
513                 strbuf_addstr(&buf, pathinfo);
514                 return strbuf_detach(&buf, NULL);
515         } else if (path && *path) {
516                 return xstrdup(path);
517         } else
518                 die("No GIT_PROJECT_ROOT or PATH_TRANSLATED from server");
519         return NULL;
522 static struct service_cmd {
523         const char *method;
524         const char *pattern;
525         void (*imp)(char *);
526 } services[] = {
527         {"GET", "/HEAD$", get_text_file},
528         {"GET", "/info/refs$", get_info_refs},
529         {"GET", "/objects/info/alternates$", get_text_file},
530         {"GET", "/objects/info/http-alternates$", get_text_file},
531         {"GET", "/objects/info/packs$", get_info_packs},
532         {"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{38}$", get_loose_object},
533         {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.pack$", get_pack_file},
534         {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.idx$", get_idx_file},
536         {"POST", "/git-upload-pack$", service_rpc},
537         {"POST", "/git-receive-pack$", service_rpc}
538 };
540 int main(int argc, char **argv)
542         char *method = getenv("REQUEST_METHOD");
543         char *dir;
544         struct service_cmd *cmd = NULL;
545         char *cmd_arg = NULL;
546         int i;
548         git_extract_argv0_path(argv[0]);
549         set_die_routine(die_webcgi);
551         if (!method)
552                 die("No REQUEST_METHOD from server");
553         if (!strcmp(method, "HEAD"))
554                 method = "GET";
555         dir = getdir();
557         for (i = 0; i < ARRAY_SIZE(services); i++) {
558                 struct service_cmd *c = &services[i];
559                 regex_t re;
560                 regmatch_t out[1];
562                 if (regcomp(&re, c->pattern, REG_EXTENDED))
563                         die("Bogus regex in service table: %s", c->pattern);
564                 if (!regexec(&re, dir, 1, out, 0)) {
565                         size_t n;
567                         if (strcmp(method, c->method)) {
568                                 const char *proto = getenv("SERVER_PROTOCOL");
569                                 if (proto && !strcmp(proto, "HTTP/1.1"))
570                                         http_status(405, "Method Not Allowed");
571                                 else
572                                         http_status(400, "Bad Request");
573                                 hdr_nocache();
574                                 end_headers();
575                                 return 0;
576                         }
578                         cmd = c;
579                         n = out[0].rm_eo - out[0].rm_so;
580                         cmd_arg = xmalloc(n);
581                         memcpy(cmd_arg, dir + out[0].rm_so + 1, n-1);
582                         cmd_arg[n-1] = '\0';
583                         dir[out[0].rm_so] = 0;
584                         break;
585                 }
586                 regfree(&re);
587         }
589         if (!cmd)
590                 not_found("Request not supported: '%s'", dir);
592         setup_path();
593         if (!enter_repo(dir, 0))
594                 not_found("Not a git repository: '%s'", dir);
595         if (!getenv("GIT_HTTP_EXPORT_ALL") &&
596             access("git-daemon-export-ok", F_OK) )
597                 not_found("Repository not exported: '%s'", dir);
599         git_config(http_config, NULL);
600         cmd->imp(cmd_arg);
601         return 0;