http-backend.c

   1 #include "git-compat-util.h"
   2 #include "alloc.h"
   3 #include "config.h"
   4 #include "hex.h"
   5 #include "repository.h"
   6 #include "refs.h"
   7 #include "pkt-line.h"
   8 #include "object.h"
   9 #include "tag.h"
  10 #include "exec-cmd.h"
  11 #include "run-command.h"
  12 #include "string-list.h"
  13 #include "url.h"
  14 #include "strvec.h"
  15 #include "packfile.h"
  16 #include "object-store.h"
  17 #include "protocol.h"
  18 #include "date.h"
  19
  20 static const char content_type[] = "Content-Type";
  21 static const char content_length[] = "Content-Length";
  22 static const char last_modified[] = "Last-Modified";
  23 static int getanyfile = 1;
  24 static unsigned long max_request_buffer = 10 * 1024 * 1024;
  25
  26 static struct string_list *query_params;
  27
  28 struct rpc_service {
  29         const char *name;
  30         const char *config_name;
  31         unsigned buffer_input : 1;
  32         signed enabled : 2;
  33 };
  34
  35 static struct rpc_service rpc_service[] = {
  36         { "upload-pack", "uploadpack", 1, 1 },
  37         { "receive-pack", "receivepack", 0, -1 },
  38 };
  39
  40 static struct string_list *get_parameters(void)
  41 {
  42         if (!query_params) {
  43                 const char *query = getenv("QUERY_STRING");
  44
  45                 CALLOC_ARRAY(query_params, 1);
  46                 while (query && *query) {
  47                         char *name = url_decode_parameter_name(&query);
  48                         char *value = url_decode_parameter_value(&query);
  49                         struct string_list_item *i;
  50
  51                         i = string_list_lookup(query_params, name);
  52                         if (!i)
  53                                 i = string_list_insert(query_params, name);
  54                         else
  55                                 free(i->util);
  56                         i->util = value;
  57                 }
  58         }
  59         return query_params;
  60 }
  61
  62 static const char *get_parameter(const char *name)
  63 {
  64         struct string_list_item *i;
  65         i = string_list_lookup(get_parameters(), name);
  66         return i ? i->util : NULL;
  67 }
  68
  69 __attribute__((format (printf, 2, 3)))
  70 static void format_write(int fd, const char *fmt, ...)
  71 {
  72         static char buffer[1024];
  73
  74         va_list args;
  75         unsigned n;
  76
  77         va_start(args, fmt);
  78         n = vsnprintf(buffer, sizeof(buffer), fmt, args);
  79         va_end(args);
  80         if (n >= sizeof(buffer))
  81                 die("protocol error: impossibly long line");
  82
  83         write_or_die(fd, buffer, n);
  84 }
  85
  86 static void http_status(struct strbuf *hdr, unsigned code, const char *msg)
  87 {
  88         strbuf_addf(hdr, "Status: %u %s\r\n", code, msg);
  89 }
  90
  91 static void hdr_str(struct strbuf *hdr, const char *name, const char *value)
  92 {
  93         strbuf_addf(hdr, "%s: %s\r\n", name, value);
  94 }
  95
  96 static void hdr_int(struct strbuf *hdr, const char *name, uintmax_t value)
  97 {
  98         strbuf_addf(hdr, "%s: %" PRIuMAX "\r\n", name, value);
  99 }
 100
 101 static void hdr_date(struct strbuf *hdr, const char *name, timestamp_t when)
 102 {
 103         const char *value = show_date(when, 0, DATE_MODE(RFC2822));
 104         hdr_str(hdr, name, value);
 105 }
 106
 107 static void hdr_nocache(struct strbuf *hdr)
 108 {
 109         hdr_str(hdr, "Expires", "Fri, 01 Jan 1980 00:00:00 GMT");
 110         hdr_str(hdr, "Pragma", "no-cache");
 111         hdr_str(hdr, "Cache-Control", "no-cache, max-age=0, must-revalidate");
 112 }
 113
 114 static void hdr_cache_forever(struct strbuf *hdr)
 115 {
 116         timestamp_t now = time(NULL);
 117         hdr_date(hdr, "Date", now);
 118         hdr_date(hdr, "Expires", now + 31536000);
 119         hdr_str(hdr, "Cache-Control", "public, max-age=31536000");
 120 }
 121
 122 static void end_headers(struct strbuf *hdr)
 123 {
 124         strbuf_add(hdr, "\r\n", 2);
 125         write_or_die(1, hdr->buf, hdr->len);
 126         strbuf_release(hdr);
 127 }
 128
 129 __attribute__((format (printf, 2, 3)))
 130 static NORETURN void not_found(struct strbuf *hdr, const char *err, ...)
 131 {
 132         va_list params;
 133
 134         http_status(hdr, 404, "Not Found");
 135         hdr_nocache(hdr);
 136         end_headers(hdr);
 137
 138         va_start(params, err);
 139         if (err && *err)
 140                 vfprintf(stderr, err, params);
 141         va_end(params);
 142         exit(0);
 143 }
 144
 145 __attribute__((format (printf, 2, 3)))
 146 static NORETURN void forbidden(struct strbuf *hdr, const char *err, ...)
 147 {
 148         va_list params;
 149
 150         http_status(hdr, 403, "Forbidden");
 151         hdr_nocache(hdr);
 152         end_headers(hdr);
 153
 154         va_start(params, err);
 155         if (err && *err)
 156                 vfprintf(stderr, err, params);
 157         va_end(params);
 158         exit(0);
 159 }
 160
 161 static void select_getanyfile(struct strbuf *hdr)
 162 {
 163         if (!getanyfile)
 164                 forbidden(hdr, "Unsupported service: getanyfile");
 165 }
 166
 167 static void send_strbuf(struct strbuf *hdr,
 168                         const char *type, struct strbuf *buf)
 169 {
 170         hdr_int(hdr, content_length, buf->len);
 171         hdr_str(hdr, content_type, type);
 172         end_headers(hdr);
 173         write_or_die(1, buf->buf, buf->len);
 174 }
 175
 176 static void send_local_file(struct strbuf *hdr, const char *the_type,
 177                                 const char *name)
 178 {
 179         char *p = git_pathdup("%s", name);
 180         size_t buf_alloc = 8192;
 181         char *buf = xmalloc(buf_alloc);
 182         int fd;
 183         struct stat sb;
 184
 185         fd = open(p, O_RDONLY);
 186         if (fd < 0)
 187                 not_found(hdr, "Cannot open '%s': %s", p, strerror(errno));
 188         if (fstat(fd, &sb) < 0)
 189                 die_errno("Cannot stat '%s'", p);
 190
 191         hdr_int(hdr, content_length, sb.st_size);
 192         hdr_str(hdr, content_type, the_type);
 193         hdr_date(hdr, last_modified, sb.st_mtime);
 194         end_headers(hdr);
 195
 196         for (;;) {
 197                 ssize_t n = xread(fd, buf, buf_alloc);
 198                 if (n < 0)
 199                         die_errno("Cannot read '%s'", p);
 200                 if (!n)
 201                         break;
 202                 write_or_die(1, buf, n);
 203         }
 204         close(fd);
 205         free(buf);
 206         free(p);
 207 }
 208
 209 static void get_text_file(struct strbuf *hdr, char *name)
 210 {
 211         select_getanyfile(hdr);
 212         hdr_nocache(hdr);
 213         send_local_file(hdr, "text/plain", name);
 214 }
 215
 216 static void get_loose_object(struct strbuf *hdr, char *name)
 217 {
 218         select_getanyfile(hdr);
 219         hdr_cache_forever(hdr);
 220         send_local_file(hdr, "application/x-git-loose-object", name);
 221 }
 222
 223 static void get_pack_file(struct strbuf *hdr, char *name)
 224 {
 225         select_getanyfile(hdr);
 226         hdr_cache_forever(hdr);
 227         send_local_file(hdr, "application/x-git-packed-objects", name);
 228 }
 229
 230 static void get_idx_file(struct strbuf *hdr, char *name)
 231 {
 232         select_getanyfile(hdr);
 233         hdr_cache_forever(hdr);
 234         send_local_file(hdr, "application/x-git-packed-objects-toc", name);
 235 }
 236
 237 static void http_config(void)
 238 {
 239         int i, value = 0;
 240         struct strbuf var = STRBUF_INIT;
 241
 242         git_config_get_bool("http.getanyfile", &getanyfile);
 243         git_config_get_ulong("http.maxrequestbuffer", &max_request_buffer);
 244
 245         for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
 246                 struct rpc_service *svc = &rpc_service[i];
 247                 strbuf_addf(&var, "http.%s", svc->config_name);
 248                 if (!git_config_get_bool(var.buf, &value))
 249                         svc->enabled = value;
 250                 strbuf_reset(&var);
 251         }
 252
 253         strbuf_release(&var);
 254 }
 255
 256 static struct rpc_service *select_service(struct strbuf *hdr, const char *name)
 257 {
 258         const char *svc_name;
 259         struct rpc_service *svc = NULL;
 260         int i;
 261
 262         if (!skip_prefix(name, "git-", &svc_name))
 263                 forbidden(hdr, "Unsupported service: '%s'", name);
 264
 265         for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
 266                 struct rpc_service *s = &rpc_service[i];
 267                 if (!strcmp(s->name, svc_name)) {
 268                         svc = s;
 269                         break;
 270                 }
 271         }
 272
 273         if (!svc)
 274                 forbidden(hdr, "Unsupported service: '%s'", name);
 275
 276         if (svc->enabled < 0) {
 277                 const char *user = getenv("REMOTE_USER");
 278                 svc->enabled = (user && *user) ? 1 : 0;
 279         }
 280         if (!svc->enabled)
 281                 forbidden(hdr, "Service not enabled: '%s'", svc->name);
 282         return svc;
 283 }
 284
 285 static void write_to_child(int out, const unsigned char *buf, ssize_t len, const char *prog_name)
 286 {
 287         if (write_in_full(out, buf, len) < 0)
 288                 die("unable to write to '%s'", prog_name);
 289 }
 290
 291 /*
 292  * This is basically strbuf_read(), except that if we
 293  * hit max_request_buffer we die (we'd rather reject a
 294  * maliciously large request than chew up infinite memory).
 295  */
 296 static ssize_t read_request_eof(int fd, unsigned char **out)
 297 {
 298         size_t len = 0, alloc = 8192;
 299         unsigned char *buf = xmalloc(alloc);
 300
 301         if (max_request_buffer < alloc)
 302                 max_request_buffer = alloc;
 303
 304         while (1) {
 305                 ssize_t cnt;
 306
 307                 cnt = read_in_full(fd, buf + len, alloc - len);
 308                 if (cnt < 0) {
 309                         free(buf);
 310                         return -1;
 311                 }
 312
 313                 /* partial read from read_in_full means we hit EOF */
 314                 len += cnt;
 315                 if (len < alloc) {
 316                         *out = buf;
 317                         return len;
 318                 }
 319
 320                 /* otherwise, grow and try again (if we can) */
 321                 if (alloc == max_request_buffer)
 322                         die("request was larger than our maximum size (%lu);"
 323                             " try setting GIT_HTTP_MAX_REQUEST_BUFFER",
 324                             max_request_buffer);
 325
 326                 alloc = alloc_nr(alloc);
 327                 if (alloc > max_request_buffer)
 328                         alloc = max_request_buffer;
 329                 REALLOC_ARRAY(buf, alloc);
 330         }
 331 }
 332
 333 static ssize_t read_request_fixed_len(int fd, ssize_t req_len, unsigned char **out)
 334 {
 335         unsigned char *buf = NULL;
 336         ssize_t cnt = 0;
 337
 338         if (max_request_buffer < req_len) {
 339                 die("request was larger than our maximum size (%lu): "
 340                     "%" PRIuMAX "; try setting GIT_HTTP_MAX_REQUEST_BUFFER",
 341                     max_request_buffer, (uintmax_t)req_len);
 342         }
 343
 344         buf = xmalloc(req_len);
 345         cnt = read_in_full(fd, buf, req_len);
 346         if (cnt < 0) {
 347                 free(buf);
 348                 return -1;
 349         }
 350         *out = buf;
 351         return cnt;
 352 }
 353
 354 static ssize_t get_content_length(void)
 355 {
 356         ssize_t val = -1;
 357         const char *str = getenv("CONTENT_LENGTH");
 358
 359         if (str && *str && !git_parse_ssize_t(str, &val))
 360                 die("failed to parse CONTENT_LENGTH: %s", str);
 361         return val;
 362 }
 363
 364 static ssize_t read_request(int fd, unsigned char **out, ssize_t req_len)
 365 {
 366         if (req_len < 0)
 367                 return read_request_eof(fd, out);
 368         else
 369                 return read_request_fixed_len(fd, req_len, out);
 370 }
 371
 372 static void inflate_request(const char *prog_name, int out, int buffer_input, ssize_t req_len)
 373 {
 374         git_zstream stream;
 375         unsigned char *full_request = NULL;
 376         unsigned char in_buf[8192];
 377         unsigned char out_buf[8192];
 378         unsigned long cnt = 0;
 379         int req_len_defined = req_len >= 0;
 380         size_t req_remaining_len = req_len;
 381
 382         memset(&stream, 0, sizeof(stream));
 383         git_inflate_init_gzip_only(&stream);
 384
 385         while (1) {
 386                 ssize_t n;
 387
 388                 if (buffer_input) {
 389                         if (full_request)
 390                                 n = 0; /* nothing left to read */
 391                         else
 392                                 n = read_request(0, &full_request, req_len);
 393                         stream.next_in = full_request;
 394                 } else {
 395                         ssize_t buffer_len;
 396                         if (req_len_defined && req_remaining_len <= sizeof(in_buf))
 397                                 buffer_len = req_remaining_len;
 398                         else
 399                                 buffer_len = sizeof(in_buf);
 400                         n = xread(0, in_buf, buffer_len);
 401                         stream.next_in = in_buf;
 402                         if (req_len_defined && n > 0)
 403                                 req_remaining_len -= n;
 404                 }
 405
 406                 if (n <= 0)
 407                         die("request ended in the middle of the gzip stream");
 408                 stream.avail_in = n;
 409
 410                 while (0 < stream.avail_in) {
 411                         int ret;
 412
 413                         stream.next_out = out_buf;
 414                         stream.avail_out = sizeof(out_buf);
 415
 416                         ret = git_inflate(&stream, Z_NO_FLUSH);
 417                         if (ret != Z_OK && ret != Z_STREAM_END)
 418                                 die("zlib error inflating request, result %d", ret);
 419
 420                         n = stream.total_out - cnt;
 421                         write_to_child(out, out_buf, stream.total_out - cnt, prog_name);
 422                         cnt = stream.total_out;
 423
 424                         if (ret == Z_STREAM_END)
 425                                 goto done;
 426                 }
 427         }
 428
 429 done:
 430         git_inflate_end(&stream);
 431         close(out);
 432         free(full_request);
 433 }
 434
 435 static void copy_request(const char *prog_name, int out, ssize_t req_len)
 436 {
 437         unsigned char *buf;
 438         ssize_t n = read_request(0, &buf, req_len);
 439         if (n < 0)
 440                 die_errno("error reading request body");
 441         write_to_child(out, buf, n, prog_name);
 442         close(out);
 443         free(buf);
 444 }
 445
 446 static void pipe_fixed_length(const char *prog_name, int out, size_t req_len)
 447 {
 448         unsigned char buf[8192];
 449         size_t remaining_len = req_len;
 450
 451         while (remaining_len > 0) {
 452                 size_t chunk_length = remaining_len > sizeof(buf) ? sizeof(buf) : remaining_len;
 453                 ssize_t n = xread(0, buf, chunk_length);
 454                 if (n < 0)
 455                         die_errno("Reading request failed");
 456                 write_to_child(out, buf, n, prog_name);
 457                 remaining_len -= n;
 458         }
 459
 460         close(out);
 461 }
 462
 463 static void run_service(const char **argv, int buffer_input)
 464 {
 465         const char *encoding = getenv("HTTP_CONTENT_ENCODING");
 466         const char *user = getenv("REMOTE_USER");
 467         const char *host = getenv("REMOTE_ADDR");
 468         int gzipped_request = 0;
 469         struct child_process cld = CHILD_PROCESS_INIT;
 470         ssize_t req_len = get_content_length();
 471
 472         if (encoding && (!strcmp(encoding, "gzip") || !strcmp(encoding, "x-gzip")))
 473                 gzipped_request = 1;
 474
 475         if (!user || !*user)
 476                 user = "anonymous";
 477         if (!host || !*host)
 478                 host = "(none)";
 479
 480         if (!getenv("GIT_COMMITTER_NAME"))
 481                 strvec_pushf(&cld.env, "GIT_COMMITTER_NAME=%s", user);
 482         if (!getenv("GIT_COMMITTER_EMAIL"))
 483                 strvec_pushf(&cld.env,
 484                              "GIT_COMMITTER_EMAIL=%s@http.%s", user, host);
 485
 486         strvec_pushv(&cld.args, argv);
 487         if (buffer_input || gzipped_request || req_len >= 0)
 488                 cld.in = -1;
 489         cld.git_cmd = 1;
 490         cld.clean_on_exit = 1;
 491         cld.wait_after_clean = 1;
 492         if (start_command(&cld))
 493                 exit(1);
 494
 495         close(1);
 496         if (gzipped_request)
 497                 inflate_request(argv[0], cld.in, buffer_input, req_len);
 498         else if (buffer_input)
 499                 copy_request(argv[0], cld.in, req_len);
 500         else if (req_len >= 0)
 501                 pipe_fixed_length(argv[0], cld.in, req_len);
 502         else
 503                 close(0);
 504
 505         if (finish_command(&cld))
 506                 exit(1);
 507 }
 508
 509 static int show_text_ref(const char *name, const struct object_id *oid,
 510                          int flag UNUSED, void *cb_data)
 511 {
 512         const char *name_nons = strip_namespace(name);
 513         struct strbuf *buf = cb_data;
 514         struct object *o = parse_object(the_repository, oid);
 515         if (!o)
 516                 return 0;
 517
 518         strbuf_addf(buf, "%s\t%s\n", oid_to_hex(oid), name_nons);
 519         if (o->type == OBJ_TAG) {
 520                 o = deref_tag(the_repository, o, name, 0);
 521                 if (!o)
 522                         return 0;
 523                 strbuf_addf(buf, "%s\t%s^{}\n", oid_to_hex(&o->oid),
 524                             name_nons);
 525         }
 526         return 0;
 527 }
 528
 529 static void get_info_refs(struct strbuf *hdr, char *arg UNUSED)
 530 {
 531         const char *service_name = get_parameter("service");
 532         struct strbuf buf = STRBUF_INIT;
 533
 534         hdr_nocache(hdr);
 535
 536         if (service_name) {
 537                 const char *argv[] = {NULL /* service name */,
 538                         "--http-backend-info-refs",
 539                         ".", NULL};
 540                 struct rpc_service *svc = select_service(hdr, service_name);
 541
 542                 strbuf_addf(&buf, "application/x-git-%s-advertisement",
 543                         svc->name);
 544                 hdr_str(hdr, content_type, buf.buf);
 545                 end_headers(hdr);
 546
 547
 548                 if (determine_protocol_version_server() != protocol_v2) {
 549                         packet_write_fmt(1, "# service=git-%s\n", svc->name);
 550                         packet_flush(1);
 551                 }
 552
 553                 argv[0] = svc->name;
 554                 run_service(argv, 0);
 555
 556         } else {
 557                 select_getanyfile(hdr);
 558                 for_each_namespaced_ref(show_text_ref, &buf);
 559                 send_strbuf(hdr, "text/plain", &buf);
 560         }
 561         strbuf_release(&buf);
 562 }
 563
 564 static int show_head_ref(const char *refname, const struct object_id *oid,
 565                          int flag, void *cb_data)
 566 {
 567         struct strbuf *buf = cb_data;
 568
 569         if (flag & REF_ISSYMREF) {
 570                 const char *target = resolve_ref_unsafe(refname,
 571                                                         RESOLVE_REF_READING,
 572                                                         NULL, NULL);
 573
 574                 if (target)
 575                         strbuf_addf(buf, "ref: %s\n", strip_namespace(target));
 576         } else {
 577                 strbuf_addf(buf, "%s\n", oid_to_hex(oid));
 578         }
 579
 580         return 0;
 581 }
 582
 583 static void get_head(struct strbuf *hdr, char *arg UNUSED)
 584 {
 585         struct strbuf buf = STRBUF_INIT;
 586
 587         select_getanyfile(hdr);
 588         head_ref_namespaced(show_head_ref, &buf);
 589         send_strbuf(hdr, "text/plain", &buf);
 590         strbuf_release(&buf);
 591 }
 592
 593 static void get_info_packs(struct strbuf *hdr, char *arg UNUSED)
 594 {
 595         size_t objdirlen = strlen(get_object_directory());
 596         struct strbuf buf = STRBUF_INIT;
 597         struct packed_git *p;
 598         size_t cnt = 0;
 599
 600         select_getanyfile(hdr);
 601         for (p = get_all_packs(the_repository); p; p = p->next) {
 602                 if (p->pack_local)
 603                         cnt++;
 604         }
 605
 606         strbuf_grow(&buf, cnt * 53 + 2);
 607         for (p = get_all_packs(the_repository); p; p = p->next) {
 608                 if (p->pack_local)
 609                         strbuf_addf(&buf, "P %s\n", p->pack_name + objdirlen + 6);
 610         }
 611         strbuf_addch(&buf, '\n');
 612
 613         hdr_nocache(hdr);
 614         send_strbuf(hdr, "text/plain; charset=utf-8", &buf);
 615         strbuf_release(&buf);
 616 }
 617
 618 static void check_content_type(struct strbuf *hdr, const char *accepted_type)
 619 {
 620         const char *actual_type = getenv("CONTENT_TYPE");
 621
 622         if (!actual_type)
 623                 actual_type = "";
 624
 625         if (strcmp(actual_type, accepted_type)) {
 626                 http_status(hdr, 415, "Unsupported Media Type");
 627                 hdr_nocache(hdr);
 628                 end_headers(hdr);
 629                 format_write(1,
 630                         "Expected POST with Content-Type '%s',"
 631                         " but received '%s' instead.\n",
 632                         accepted_type, actual_type);
 633                 exit(0);
 634         }
 635 }
 636
 637 static void service_rpc(struct strbuf *hdr, char *service_name)
 638 {
 639         const char *argv[] = {NULL, "--stateless-rpc", ".", NULL};
 640         struct rpc_service *svc = select_service(hdr, service_name);
 641         struct strbuf buf = STRBUF_INIT;
 642
 643         strbuf_reset(&buf);
 644         strbuf_addf(&buf, "application/x-git-%s-request", svc->name);
 645         check_content_type(hdr, buf.buf);
 646
 647         hdr_nocache(hdr);
 648
 649         strbuf_reset(&buf);
 650         strbuf_addf(&buf, "application/x-git-%s-result", svc->name);
 651         hdr_str(hdr, content_type, buf.buf);
 652
 653         end_headers(hdr);
 654
 655         argv[0] = svc->name;
 656         run_service(argv, svc->buffer_input);
 657         strbuf_release(&buf);
 658 }
 659
 660 static int dead;
 661 static NORETURN void die_webcgi(const char *err, va_list params)
 662 {
 663         if (dead <= 1) {
 664                 struct strbuf hdr = STRBUF_INIT;
 665                 report_fn die_message_fn = get_die_message_routine();
 666
 667                 die_message_fn(err, params);
 668
 669                 http_status(&hdr, 500, "Internal Server Error");
 670                 hdr_nocache(&hdr);
 671                 end_headers(&hdr);
 672         }
 673         exit(0); /* we successfully reported a failure ;-) */
 674 }
 675
 676 static int die_webcgi_recursing(void)
 677 {
 678         return dead++ > 1;
 679 }
 680
 681 static char* getdir(void)
 682 {
 683         struct strbuf buf = STRBUF_INIT;
 684         char *pathinfo = getenv("PATH_INFO");
 685         char *root = getenv("GIT_PROJECT_ROOT");
 686         char *path = getenv("PATH_TRANSLATED");
 687
 688         if (root && *root) {
 689                 if (!pathinfo || !*pathinfo)
 690                         die("GIT_PROJECT_ROOT is set but PATH_INFO is not");
 691                 if (daemon_avoid_alias(pathinfo))
 692                         die("'%s': aliased", pathinfo);
 693                 end_url_with_slash(&buf, root);
 694                 if (pathinfo[0] == '/')
 695                         pathinfo++;
 696                 strbuf_addstr(&buf, pathinfo);
 697                 return strbuf_detach(&buf, NULL);
 698         } else if (path && *path) {
 699                 return xstrdup(path);
 700         } else
 701                 die("No GIT_PROJECT_ROOT or PATH_TRANSLATED from server");
 702         return NULL;
 703 }
 704
 705 static struct service_cmd {
 706         const char *method;
 707         const char *pattern;
 708         void (*imp)(struct strbuf *, char *);
 709 } services[] = {
 710         {"GET", "/HEAD$", get_head},
 711         {"GET", "/info/refs$", get_info_refs},
 712         {"GET", "/objects/info/alternates$", get_text_file},
 713         {"GET", "/objects/info/http-alternates$", get_text_file},
 714         {"GET", "/objects/info/packs$", get_info_packs},
 715         {"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{38}$", get_loose_object},
 716         {"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{62}$", get_loose_object},
 717         {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.pack$", get_pack_file},
 718         {"GET", "/objects/pack/pack-[0-9a-f]{64}\\.pack$", get_pack_file},
 719         {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.idx$", get_idx_file},
 720         {"GET", "/objects/pack/pack-[0-9a-f]{64}\\.idx$", get_idx_file},
 721
 722         {"POST", "/git-upload-pack$", service_rpc},
 723         {"POST", "/git-receive-pack$", service_rpc}
 724 };
 725
 726 static int bad_request(struct strbuf *hdr, const struct service_cmd *c)
 727 {
 728         const char *proto = getenv("SERVER_PROTOCOL");
 729
 730         if (proto && !strcmp(proto, "HTTP/1.1")) {
 731                 http_status(hdr, 405, "Method Not Allowed");
 732                 hdr_str(hdr, "Allow",
 733                         !strcmp(c->method, "GET") ? "GET, HEAD" : c->method);
 734         } else
 735                 http_status(hdr, 400, "Bad Request");
 736         hdr_nocache(hdr);
 737         end_headers(hdr);
 738         return 0;
 739 }
 740
 741 int cmd_main(int argc UNUSED, const char **argv UNUSED)
 742 {
 743         char *method = getenv("REQUEST_METHOD");
 744         const char *proto_header;
 745         char *dir;
 746         struct service_cmd *cmd = NULL;
 747         char *cmd_arg = NULL;
 748         int i;
 749         struct strbuf hdr = STRBUF_INIT;
 750
 751         set_die_routine(die_webcgi);
 752         set_die_is_recursing_routine(die_webcgi_recursing);
 753
 754         if (!method)
 755                 die("No REQUEST_METHOD from server");
 756         if (!strcmp(method, "HEAD"))
 757                 method = "GET";
 758         dir = getdir();
 759
 760         for (i = 0; i < ARRAY_SIZE(services); i++) {
 761                 struct service_cmd *c = &services[i];
 762                 regex_t re;
 763                 regmatch_t out[1];
 764                 int ret;
 765
 766                 if (regcomp(&re, c->pattern, REG_EXTENDED))
 767                         die("Bogus regex in service table: %s", c->pattern);
 768                 ret = regexec(&re, dir, 1, out, 0);
 769                 regfree(&re);
 770
 771                 if (!ret) {
 772                         size_t n;
 773
 774                         if (strcmp(method, c->method))
 775                                 return bad_request(&hdr, c);
 776
 777                         cmd = c;
 778                         n = out[0].rm_eo - out[0].rm_so;
 779                         cmd_arg = xmemdupz(dir + out[0].rm_so + 1, n - 1);
 780                         dir[out[0].rm_so] = 0;
 781                         break;
 782                 }
 783         }
 784
 785         if (!cmd)
 786                 not_found(&hdr, "Request not supported: '%s'", dir);
 787
 788         setup_path();
 789         if (!enter_repo(dir, 0))
 790                 not_found(&hdr, "Not a git repository: '%s'", dir);
 791         if (!getenv("GIT_HTTP_EXPORT_ALL") &&
 792             access("git-daemon-export-ok", F_OK) )
 793                 not_found(&hdr, "Repository not exported: '%s'", dir);
 794         free(dir);
 795
 796         http_config();
 797         max_request_buffer = git_env_ulong("GIT_HTTP_MAX_REQUEST_BUFFER",
 798                                            max_request_buffer);
 799         proto_header = getenv("HTTP_GIT_PROTOCOL");
 800         if (proto_header)
 801                 setenv(GIT_PROTOCOL_ENVIRONMENT, proto_header, 0);
 802
 803         cmd->imp(&hdr, cmd_arg);
 804         free(cmd_arg);
 805         return 0;
 806 }