1 #include "first.h" 2 3 #include "base.h" 4 #include "array.h" 5 #include "buffer.h" 6 #include "fdevent.h" 7 #include "log.h" 8 #include "etag.h" 9 #include "http_chunk.h" 10 #include "http_header.h" 11 #include "response.h" 12 #include "sock_addr.h" 13 #include "stat_cache.h" 14 #include "settings.h" /* MAX_HTTP_REQUEST_HEADER MAX_READ_LIMIT */ 15 16 #include <stdlib.h> 17 #include <string.h> 18 #include <errno.h> 19 #include <fcntl.h> 20 21 #include <time.h> 22 23 #include "sys-socket.h" 24 #include <unistd.h> 25 26 27 static int http_response_buffer_append_authority(request_st * const r, buffer * const o) { 28 if (!buffer_string_is_empty(&r->uri.authority)) { 29 buffer_append_string_buffer(o, &r->uri.authority); 30 } else { 31 /* get the name of the currently connected socket */ 32 sock_addr our_addr; 33 socklen_t our_addr_len; 34 35 our_addr.plain.sa_family = 0; 36 our_addr_len = sizeof(our_addr); 37 38 if (-1 == getsockname(r->con->fd, (struct sockaddr *)&our_addr, &our_addr_len) 39 || our_addr_len > (socklen_t)sizeof(our_addr)) { 40 r->http_status = 500; 41 log_perror(r->conf.errh, __FILE__, __LINE__, "can't get sockname"); 42 return -1; 43 } 44 45 if (our_addr.plain.sa_family == AF_INET 46 && our_addr.ipv4.sin_addr.s_addr == htonl(INADDR_LOOPBACK)) { 47 static char lhost[32]; 48 static size_t lhost_len = 0; 49 if (0 != lhost_len) { 50 buffer_append_string_len(o, lhost, lhost_len); 51 } 52 else { 53 size_t olen = buffer_string_length(o); 54 if (0 == sock_addr_nameinfo_append_buffer(o, &our_addr, r->conf.errh)) { 55 lhost_len = buffer_string_length(o) - olen; 56 if (lhost_len < sizeof(lhost)) { 57 memcpy(lhost, o->ptr+olen, lhost_len+1); /*(+1 for '\0')*/ 58 } 59 else { 60 lhost_len = 0; 61 } 62 } 63 else { 64 lhost_len = sizeof("localhost")-1; 65 memcpy(lhost, "localhost", lhost_len+1); /*(+1 for '\0')*/ 66 buffer_append_string_len(o, lhost, lhost_len); 67 } 68 } 69 } else if (!buffer_string_is_empty(r->server_name)) { 70 buffer_append_string_buffer(o, r->server_name); 71 } else 72 /* Lookup name: secondly try to get hostname for bind address */ 73 if (0 != sock_addr_nameinfo_append_buffer(o, &our_addr, r->conf.errh)) { 74 r->http_status = 500; 75 return -1; 76 } 77 78 { 79 unsigned short listen_port = sock_addr_get_port(&our_addr); 80 unsigned short default_port = 80; 81 if (buffer_is_equal_string(&r->uri.scheme, CONST_STR_LEN("https"))) { 82 default_port = 443; 83 } 84 if (0 == listen_port) listen_port = r->con->srv->srvconf.port; 85 if (default_port != listen_port) { 86 buffer_append_string_len(o, CONST_STR_LEN(":")); 87 buffer_append_int(o, listen_port); 88 } 89 } 90 } 91 return 0; 92 } 93 94 int http_response_redirect_to_directory(request_st * const r, int status) { 95 buffer *o = r->tmp_buf; 96 buffer_copy_buffer(o, &r->uri.scheme); 97 buffer_append_string_len(o, CONST_STR_LEN("://")); 98 if (0 != http_response_buffer_append_authority(r, o)) { 99 return -1; 100 } 101 buffer_append_string_encoded(o, CONST_BUF_LEN(&r->uri.path), ENCODING_REL_URI); 102 buffer_append_string_len(o, CONST_STR_LEN("/")); 103 if (!buffer_string_is_empty(&r->uri.query)) { 104 buffer_append_string_len(o, CONST_STR_LEN("?")); 105 buffer_append_string_buffer(o, &r->uri.query); 106 } 107 108 if (status >= 300) { 109 http_header_response_set(r, HTTP_HEADER_LOCATION, CONST_STR_LEN("Location"), CONST_BUF_LEN(o)); 110 r->http_status = status; 111 r->resp_body_finished = 1; 112 } 113 else { 114 http_header_response_set(r, HTTP_HEADER_CONTENT_LOCATION, CONST_STR_LEN("Content-Location"), CONST_BUF_LEN(o)); 115 } 116 117 return 0; 118 } 119 120 #define MTIME_CACHE_MAX 16 121 struct mtime_cache_type { 122 time_t mtime; /* key */ 123 buffer str; /* buffer for string representation */ 124 }; 125 static struct mtime_cache_type mtime_cache[MTIME_CACHE_MAX]; 126 static char mtime_cache_str[MTIME_CACHE_MAX][30]; 127 /* 30-chars for "%a, %d %b %Y %H:%M:%S GMT" */ 128 129 void strftime_cache_reset(void) { 130 for (int i = 0; i < MTIME_CACHE_MAX; ++i) { 131 mtime_cache[i].mtime = (time_t)-1; 132 mtime_cache[i].str.ptr = mtime_cache_str[i]; 133 mtime_cache[i].str.used = sizeof(mtime_cache_str[0]); 134 mtime_cache[i].str.size = sizeof(mtime_cache_str[0]); 135 } 136 } 137 138 const buffer * strftime_cache_get(const time_t last_mod) { 139 static int mtime_cache_idx; 140 141 for (int j = 0; j < MTIME_CACHE_MAX; ++j) { 142 if (mtime_cache[j].mtime == last_mod) 143 return &mtime_cache[j].str; /* found cache-entry */ 144 } 145 146 if (++mtime_cache_idx == MTIME_CACHE_MAX) mtime_cache_idx = 0; 147 148 const int i = mtime_cache_idx; 149 mtime_cache[i].mtime = last_mod; 150 strftime(mtime_cache[i].str.ptr, sizeof(mtime_cache_str[0]), 151 "%a, %d %b %Y %H:%M:%S GMT", gmtime(&mtime_cache[i].mtime)); 152 153 return &mtime_cache[i].str; 154 } 155 156 157 int http_response_handle_cachable(request_st * const r, const buffer * const mtime) { 158 const buffer *vb; 159 160 /* 161 * 14.26 If-None-Match 162 * [...] 163 * If none of the entity tags match, then the server MAY perform the 164 * requested method as if the If-None-Match header field did not exist, 165 * but MUST also ignore any If-Modified-Since header field(s) in the 166 * request. That is, if no entity tags match, then the server MUST NOT 167 * return a 304 (Not Modified) response. 168 */ 169 170 if ((vb = http_header_request_get(r, HTTP_HEADER_IF_NONE_MATCH, CONST_STR_LEN("If-None-Match")))) { 171 /*(weak etag comparison must not be used for ranged requests)*/ 172 int range_request = 173 (r->conf.range_requests 174 && (200 == r->http_status || 0 == r->http_status) 175 && NULL != http_header_request_get(r, HTTP_HEADER_RANGE, CONST_STR_LEN("Range"))); 176 if (etag_is_equal(&r->physical.etag, vb->ptr, !range_request)) { 177 if (http_method_get_or_head(r->http_method)) { 178 r->http_status = 304; 179 return HANDLER_FINISHED; 180 } else { 181 r->http_status = 412; 182 r->handler_module = NULL; 183 return HANDLER_FINISHED; 184 } 185 } 186 } else if (http_method_get_or_head(r->http_method) 187 && (vb = http_header_request_get(r, HTTP_HEADER_IF_MODIFIED_SINCE, CONST_STR_LEN("If-Modified-Since")))) { 188 /* last-modified handling */ 189 size_t used_len; 190 char *semicolon; 191 192 if (NULL == (semicolon = strchr(vb->ptr, ';'))) { 193 used_len = buffer_string_length(vb); 194 } else { 195 used_len = semicolon - vb->ptr; 196 } 197 198 if (buffer_is_equal_string(mtime, vb->ptr, used_len)) { 199 if ('\0' == mtime->ptr[used_len]) r->http_status = 304; 200 return HANDLER_FINISHED; 201 } else { 202 char buf[sizeof("Sat, 23 Jul 2005 21:20:01 GMT")]; 203 time_t t_header, t_file; 204 struct tm tm; 205 206 /* convert to timestamp */ 207 if (used_len >= sizeof(buf)) return HANDLER_GO_ON; 208 209 memcpy(buf, vb->ptr, used_len); 210 buf[used_len] = '\0'; 211 212 if (NULL == strptime(buf, "%a, %d %b %Y %H:%M:%S GMT", &tm)) { 213 /** 214 * parsing failed, let's get out of here 215 */ 216 return HANDLER_GO_ON; 217 } 218 tm.tm_isdst = 0; 219 t_header = mktime(&tm); 220 221 strptime(mtime->ptr, "%a, %d %b %Y %H:%M:%S GMT", &tm); 222 tm.tm_isdst = 0; 223 t_file = mktime(&tm); 224 225 if (t_file > t_header) return HANDLER_GO_ON; 226 227 r->http_status = 304; 228 return HANDLER_FINISHED; 229 } 230 } 231 232 return HANDLER_GO_ON; 233 } 234 235 236 void http_response_body_clear (request_st * const r, int preserve_length) { 237 r->resp_send_chunked = 0; 238 if (r->resp_htags & HTTP_HEADER_TRANSFER_ENCODING) { 239 http_header_response_unset(r, HTTP_HEADER_TRANSFER_ENCODING, CONST_STR_LEN("Transfer-Encoding")); 240 } 241 if (!preserve_length) { /* preserve for HEAD responses and no-content responses (204, 205, 304) */ 242 r->content_length = -1; 243 if (r->resp_htags & HTTP_HEADER_CONTENT_LENGTH) { 244 http_header_response_unset(r, HTTP_HEADER_CONTENT_LENGTH, CONST_STR_LEN("Content-Length")); 245 } 246 } 247 chunkqueue_reset(r->write_queue); 248 } 249 250 251 static int http_response_parse_range(request_st * const r, buffer * const path, stat_cache_entry * const sce, const char * const range) { 252 int multipart = 0; 253 int error; 254 off_t start, end; 255 const char *s, *minus; 256 static const char boundary[] = "fkj49sn38dcn3"; 257 const buffer *content_type = http_header_response_get(r, HTTP_HEADER_CONTENT_TYPE, CONST_STR_LEN("Content-Type")); 258 259 start = 0; 260 end = sce->st.st_size - 1; 261 262 r->content_length = 0; 263 264 for (s = range, error = 0; 265 !error && *s && NULL != (minus = strchr(s, '-')); ) { 266 char *err; 267 off_t la = 0, le; 268 *((const char **)&err) = s; /*(quiet clang --analyze)*/ 269 270 if (s != minus) { 271 la = strtoll(s, &err, 10); 272 if (err != minus) { 273 /* should not have multiple range-unit in Range, but 274 * handle just in case multiple Range headers merged */ 275 while (*s == ' ' || *s == '\t') ++s; 276 if (0 != strncmp(s, "bytes=", 6)) return -1; 277 s += 6; 278 if (s != minus) { 279 la = strtoll(s, &err, 10); 280 if (err != minus) return -1; 281 } 282 } 283 } 284 285 if (s == minus) { 286 /* -<stop> */ 287 288 le = strtoll(s, &err, 10); 289 290 if (le == 0) { 291 /* RFC 2616 - 14.35.1 */ 292 293 r->http_status = 416; 294 error = 1; 295 } else if (*err == '\0') { 296 /* end */ 297 s = err; 298 299 end = sce->st.st_size - 1; 300 start = sce->st.st_size + le; 301 } else if (*err == ',') { 302 multipart = 1; 303 s = err + 1; 304 305 end = sce->st.st_size - 1; 306 start = sce->st.st_size + le; 307 } else { 308 error = 1; 309 } 310 311 } else if (*(minus+1) == '\0' || *(minus+1) == ',') { 312 /* <start>- */ 313 314 /* ok */ 315 316 if (*(err + 1) == '\0') { 317 s = err + 1; 318 319 end = sce->st.st_size - 1; 320 start = la; 321 322 } else if (*(err + 1) == ',') { 323 multipart = 1; 324 s = err + 2; 325 326 end = sce->st.st_size - 1; 327 start = la; 328 } else { 329 error = 1; 330 } 331 } else { 332 /* <start>-<stop> */ 333 334 le = strtoll(minus+1, &err, 10); 335 336 /* RFC 2616 - 14.35.1 */ 337 if (la > le) { 338 error = 1; 339 } 340 341 if (*err == '\0') { 342 /* ok, end*/ 343 s = err; 344 345 end = le; 346 start = la; 347 } else if (*err == ',') { 348 multipart = 1; 349 s = err + 1; 350 351 end = le; 352 start = la; 353 } else { 354 /* error */ 355 356 error = 1; 357 } 358 } 359 360 if (!error) { 361 if (start < 0) start = 0; 362 363 /* RFC 2616 - 14.35.1 */ 364 if (end > sce->st.st_size - 1) end = sce->st.st_size - 1; 365 366 if (start > sce->st.st_size - 1) { 367 error = 1; 368 369 r->http_status = 416; 370 } 371 } 372 373 if (!error) { 374 if (multipart) { 375 /* write boundary-header */ 376 buffer *b = r->tmp_buf; 377 buffer_copy_string_len(b, CONST_STR_LEN("\r\n--")); 378 buffer_append_string_len(b, boundary, sizeof(boundary)-1); 379 380 /* write Content-Range */ 381 buffer_append_string_len(b, CONST_STR_LEN("\r\nContent-Range: bytes ")); 382 buffer_append_int(b, start); 383 buffer_append_string_len(b, CONST_STR_LEN("-")); 384 buffer_append_int(b, end); 385 buffer_append_string_len(b, CONST_STR_LEN("/")); 386 buffer_append_int(b, sce->st.st_size); 387 388 if (content_type) { 389 buffer_append_string_len(b, CONST_STR_LEN("\r\nContent-Type: ")); 390 buffer_append_string_buffer(b, content_type); 391 } 392 393 /* write END-OF-HEADER */ 394 buffer_append_string_len(b, CONST_STR_LEN("\r\n\r\n")); 395 396 r->content_length += buffer_string_length(b); 397 chunkqueue_append_mem(r->write_queue, CONST_BUF_LEN(b)); 398 } 399 400 chunkqueue_append_file(r->write_queue, path, start, end - start + 1); 401 r->content_length += end - start + 1; 402 } 403 } 404 405 /* something went wrong */ 406 if (error) return -1; 407 408 buffer * const tb = r->tmp_buf; 409 410 if (multipart) { 411 /* add boundary end */ 412 buffer_copy_string_len(tb, "\r\n--", 4); 413 buffer_append_string_len(tb, boundary, sizeof(boundary)-1); 414 buffer_append_string_len(tb, "--\r\n", 4); 415 416 r->content_length += buffer_string_length(tb); 417 chunkqueue_append_mem(r->write_queue, CONST_BUF_LEN(tb)); 418 419 /* set header-fields */ 420 421 buffer_copy_string_len(tb, CONST_STR_LEN("multipart/byteranges; boundary=")); 422 buffer_append_string_len(tb, boundary, sizeof(boundary)-1); 423 424 /* overwrite content-type */ 425 http_header_response_set(r, HTTP_HEADER_CONTENT_TYPE, CONST_STR_LEN("Content-Type"), CONST_BUF_LEN(tb)); 426 } else { 427 /* add Content-Range-header */ 428 429 buffer_copy_string_len(tb, CONST_STR_LEN("bytes ")); 430 buffer_append_int(tb, start); 431 buffer_append_string_len(tb, CONST_STR_LEN("-")); 432 buffer_append_int(tb, end); 433 buffer_append_string_len(tb, CONST_STR_LEN("/")); 434 buffer_append_int(tb, sce->st.st_size); 435 436 http_header_response_set(r, HTTP_HEADER_OTHER, CONST_STR_LEN("Content-Range"), CONST_BUF_LEN(tb)); 437 } 438 439 /* ok, the file is set-up */ 440 return 0; 441 } 442 443 444 void http_response_send_file (request_st * const r, buffer * const path) { 445 stat_cache_entry * const sce = stat_cache_get_entry(path); 446 const buffer *mtime = NULL; 447 const buffer *vb; 448 int allow_caching = (0 == r->http_status || 200 == r->http_status); 449 450 if (NULL == sce) { 451 r->http_status = (errno == ENOENT) ? 404 : 403; 452 log_error(r->conf.errh, __FILE__, __LINE__, 453 "not a regular file: %s -> %s", r->uri.path.ptr, path->ptr); 454 return; 455 } 456 457 if (!r->conf.follow_symlink 458 && 0 != stat_cache_path_contains_symlink(path, r->conf.errh)) { 459 r->http_status = 403; 460 if (r->conf.log_request_handling) { 461 log_error(r->conf.errh, __FILE__, __LINE__, 462 "-- access denied due symlink restriction"); 463 log_error(r->conf.errh, __FILE__, __LINE__, 464 "Path : %s", path->ptr); 465 } 466 return; 467 } 468 469 /* we only handle regular files */ 470 if (!S_ISREG(sce->st.st_mode)) { 471 r->http_status = 403; 472 if (r->conf.log_file_not_found) { 473 log_error(r->conf.errh, __FILE__, __LINE__, 474 "not a regular file: %s -> %s", 475 r->uri.path.ptr, path->ptr); 476 } 477 return; 478 } 479 480 /*(Note: O_NOFOLLOW affects only the final path segment, 481 * the target file, not any intermediate symlinks along path)*/ 482 const int fd = (0 != sce->st.st_size) 483 ? fdevent_open_cloexec(path->ptr, r->conf.follow_symlink, O_RDONLY, 0) 484 : -1; 485 if (fd < 0 && 0 != sce->st.st_size) { 486 r->http_status = (errno == ENOENT) ? 404 : 403; 487 if (r->conf.log_request_handling) { 488 log_perror(r->conf.errh, __FILE__, __LINE__, 489 "file open failed: %s", path->ptr); 490 } 491 return; 492 } 493 494 /* set response content-type, if not set already */ 495 496 if (NULL == http_header_response_get(r, HTTP_HEADER_CONTENT_TYPE, CONST_STR_LEN("Content-Type"))) { 497 const buffer *content_type = stat_cache_content_type_get(sce, r); 498 if (buffer_string_is_empty(content_type)) { 499 /* we are setting application/octet-stream, but also announce that 500 * this header field might change in the seconds few requests 501 * 502 * This should fix the aggressive caching of FF and the script download 503 * seen by the first installations 504 */ 505 http_header_response_set(r, HTTP_HEADER_CONTENT_TYPE, CONST_STR_LEN("Content-Type"), CONST_STR_LEN("application/octet-stream")); 506 507 allow_caching = 0; 508 } else { 509 http_header_response_set(r, HTTP_HEADER_CONTENT_TYPE, CONST_STR_LEN("Content-Type"), CONST_BUF_LEN(content_type)); 510 } 511 } 512 513 if (r->conf.range_requests) { 514 http_header_response_append(r, HTTP_HEADER_OTHER, CONST_STR_LEN("Accept-Ranges"), CONST_STR_LEN("bytes")); 515 } 516 517 if (allow_caching) { 518 const buffer *etag = (0 != r->conf.etag_flags) 519 ? stat_cache_etag_get(sce, r->conf.etag_flags) 520 : NULL; 521 if (!buffer_string_is_empty(etag)) { 522 if (NULL == http_header_response_get(r, HTTP_HEADER_ETAG, CONST_STR_LEN("ETag"))) { 523 /* generate e-tag */ 524 etag_mutate(&r->physical.etag, etag); 525 526 http_header_response_set(r, HTTP_HEADER_ETAG, CONST_STR_LEN("ETag"), CONST_BUF_LEN(&r->physical.etag)); 527 } 528 } 529 530 /* prepare header */ 531 if (NULL == (mtime = http_header_response_get(r, HTTP_HEADER_LAST_MODIFIED, CONST_STR_LEN("Last-Modified")))) { 532 mtime = strftime_cache_get(sce->st.st_mtime); 533 http_header_response_set(r, HTTP_HEADER_LAST_MODIFIED, CONST_STR_LEN("Last-Modified"), CONST_BUF_LEN(mtime)); 534 } 535 536 if (HANDLER_FINISHED == http_response_handle_cachable(r, mtime)) { 537 if (fd >= 0) close(fd); 538 return; 539 } 540 } 541 542 if (fd < 0) { /* 0-length file */ 543 r->http_status = 200; 544 r->resp_body_finished = 1; 545 return; 546 } 547 548 if (r->conf.range_requests 549 && (200 == r->http_status || 0 == r->http_status) 550 && NULL != (vb = http_header_request_get(r, HTTP_HEADER_RANGE, CONST_STR_LEN("Range"))) 551 && NULL == http_header_response_get(r, HTTP_HEADER_CONTENT_ENCODING, CONST_STR_LEN("Content-Encoding"))) { 552 const buffer *range = vb; 553 int do_range_request = 1; 554 /* check if we have a conditional GET */ 555 556 if (NULL != (vb = http_header_request_get(r, HTTP_HEADER_OTHER, CONST_STR_LEN("If-Range")))) { 557 /* if the value is the same as our ETag, we do a Range-request, 558 * otherwise a full 200 */ 559 560 if (vb->ptr[0] == '"') { 561 /** 562 * client wants a ETag 563 */ 564 if (!buffer_is_equal(vb, &r->physical.etag)) { 565 do_range_request = 0; 566 } 567 } else if (!mtime) { 568 /** 569 * we don't have a Last-Modified and can match the If-Range: 570 * 571 * sending all 572 */ 573 do_range_request = 0; 574 } else if (!buffer_is_equal(vb, mtime)) { 575 do_range_request = 0; 576 } 577 } 578 579 if (do_range_request 580 && !buffer_string_is_empty(range) 581 && 0 == strncmp(range->ptr, "bytes=", 6)) { 582 /* support only "bytes" byte-unit */ 583 /* content prepared, I'm done */ 584 r->resp_body_finished = 1; 585 586 if (0 == http_response_parse_range(r, path, sce, range->ptr+6)) { 587 r->http_status = 206; 588 } 589 close(fd); 590 return; 591 } 592 } 593 594 /* if we are still here, prepare body */ 595 596 /* we add it here for all requests 597 * the HEAD request will drop it afterwards again 598 */ 599 600 if (0 == http_chunk_append_file_fd(r, path, fd, sce->st.st_size)) { 601 r->http_status = 200; 602 r->resp_body_finished = 1; 603 } 604 else { 605 r->http_status = 500; 606 } 607 } 608 609 610 static void http_response_xsendfile (request_st * const r, buffer * const path, const array * const xdocroot) { 611 const int status = r->http_status; 612 int valid = 1; 613 614 /* reset Content-Length, if set by backend 615 * Content-Length might later be set to size of X-Sendfile static file, 616 * determined by open(), fstat() to reduces race conditions if the file 617 * is modified between stat() (stat_cache_get_entry()) and open(). */ 618 if (r->resp_htags & HTTP_HEADER_CONTENT_LENGTH) { 619 http_header_response_unset(r, HTTP_HEADER_CONTENT_LENGTH, CONST_STR_LEN("Content-Length")); 620 r->content_length = -1; 621 } 622 623 buffer_urldecode_path(path); 624 if (!buffer_is_valid_UTF8(path)) { 625 log_error(r->conf.errh, __FILE__, __LINE__, 626 "X-Sendfile invalid UTF-8 after url-decode: %s", path->ptr); 627 if (r->http_status < 400) { 628 r->http_status = 502; 629 r->handler_module = NULL; 630 } 631 return; 632 } 633 buffer_path_simplify(path, path); 634 if (r->conf.force_lowercase_filenames) { 635 buffer_to_lower(path); 636 } 637 638 /* check that path is under xdocroot(s) 639 * - xdocroot should have trailing slash appended at config time 640 * - r->conf.force_lowercase_filenames is not a server-wide setting, 641 * and so can not be definitively applied to xdocroot at config time*/ 642 if (xdocroot) { 643 size_t i, xlen = buffer_string_length(path); 644 for (i = 0; i < xdocroot->used; ++i) { 645 data_string *ds = (data_string *)xdocroot->data[i]; 646 size_t dlen = buffer_string_length(&ds->value); 647 if (dlen <= xlen 648 && (!r->conf.force_lowercase_filenames 649 ? 0 == memcmp(path->ptr, ds->value.ptr, dlen) 650 : buffer_eq_icase_ssn(path->ptr, ds->value.ptr, dlen))) { 651 break; 652 } 653 } 654 if (i == xdocroot->used && 0 != i) { 655 log_error(r->conf.errh, __FILE__, __LINE__, 656 "X-Sendfile (%s) not under configured x-sendfile-docroot(s)", path->ptr); 657 r->http_status = 403; 658 valid = 0; 659 } 660 } 661 662 if (valid) http_response_send_file(r, path); 663 664 if (r->http_status >= 400 && status < 300) { 665 r->handler_module = NULL; 666 } else if (0 != status && 200 != status) { 667 r->http_status = status; 668 } 669 } 670 671 672 static void http_response_xsendfile2(request_st * const r, const buffer * const value, const array * const xdocroot) { 673 const char *pos = value->ptr; 674 buffer * const b = r->tmp_buf; 675 const int status = r->http_status; 676 677 /* reset Content-Length, if set by backend */ 678 if (r->resp_htags & HTTP_HEADER_CONTENT_LENGTH) { 679 http_header_response_unset(r, HTTP_HEADER_CONTENT_LENGTH, CONST_STR_LEN("Content-Length")); 680 r->content_length = -1; 681 } 682 683 while (*pos) { 684 const char *filename, *range; 685 stat_cache_entry *sce; 686 off_t begin_range, end_range, range_len; 687 688 while (' ' == *pos) pos++; 689 if (!*pos) break; 690 691 filename = pos; 692 if (NULL == (range = strchr(pos, ' '))) { 693 /* missing range */ 694 log_error(r->conf.errh, __FILE__, __LINE__, 695 "Couldn't find range after filename: %s", filename); 696 r->http_status = 502; 697 break; 698 } 699 buffer_copy_string_len(b, filename, range - filename); 700 701 /* find end of range */ 702 for (pos = ++range; *pos && *pos != ' ' && *pos != ','; pos++) ; 703 704 buffer_urldecode_path(b); 705 if (!buffer_is_valid_UTF8(b)) { 706 log_error(r->conf.errh, __FILE__, __LINE__, 707 "X-Sendfile2 invalid UTF-8 after url-decode: %s", b->ptr); 708 r->http_status = 502; 709 break; 710 } 711 buffer_path_simplify(b, b); 712 if (r->conf.force_lowercase_filenames) { 713 buffer_to_lower(b); 714 } 715 if (xdocroot) { 716 size_t i, xlen = buffer_string_length(b); 717 for (i = 0; i < xdocroot->used; ++i) { 718 data_string *ds = (data_string *)xdocroot->data[i]; 719 size_t dlen = buffer_string_length(&ds->value); 720 if (dlen <= xlen 721 && (!r->conf.force_lowercase_filenames 722 ? 0 == memcmp(b->ptr, ds->value.ptr, dlen) 723 : buffer_eq_icase_ssn(b->ptr, ds->value.ptr, dlen))) { 724 break; 725 } 726 } 727 if (i == xdocroot->used && 0 != i) { 728 log_error(r->conf.errh, __FILE__, __LINE__, 729 "X-Sendfile2 (%s) not under configured x-sendfile-docroot(s)", 730 b->ptr); 731 r->http_status = 403; 732 break; 733 } 734 } 735 736 sce = stat_cache_get_entry(b); 737 if (NULL == sce) { 738 log_error(r->conf.errh, __FILE__, __LINE__, 739 "send-file error: couldn't get stat_cache entry for " 740 "X-Sendfile2: %s", b->ptr); 741 r->http_status = 404; 742 break; 743 } else if (!S_ISREG(sce->st.st_mode)) { 744 log_error(r->conf.errh, __FILE__, __LINE__, 745 "send-file error: wrong filetype for X-Sendfile2: %s", b->ptr); 746 r->http_status = 502; 747 break; 748 } 749 /* found the file */ 750 751 /* parse range */ 752 end_range = sce->st.st_size - 1; 753 { 754 char *rpos = NULL; 755 errno = 0; 756 begin_range = strtoll(range, &rpos, 10); 757 if (errno != 0 || begin_range < 0 || rpos == range) 758 goto range_failed; 759 if ('-' != *rpos++) goto range_failed; 760 if (rpos != pos) { 761 range = rpos; 762 end_range = strtoll(range, &rpos, 10); 763 if (errno != 0 || end_range < 0 || rpos == range) 764 goto range_failed; 765 } 766 if (rpos != pos) goto range_failed; 767 768 goto range_success; 769 770 range_failed: 771 log_error(r->conf.errh, __FILE__, __LINE__, 772 "Couldn't decode range after filename: %s", filename); 773 r->http_status = 502; 774 break; 775 776 range_success: ; 777 } 778 779 /* no parameters accepted */ 780 781 while (*pos == ' ') pos++; 782 if (*pos != '\0' && *pos != ',') { 783 r->http_status = 502; 784 break; 785 } 786 787 range_len = end_range - begin_range + 1; 788 if (range_len < 0) { 789 r->http_status = 502; 790 break; 791 } 792 if (range_len != 0) { 793 if (0 != 794 http_chunk_append_file_range(r, b, begin_range, range_len)) { 795 r->http_status = 502; 796 break; 797 } 798 } 799 800 if (*pos == ',') pos++; 801 } 802 803 if (r->http_status >= 400 && status < 300) { 804 r->handler_module = NULL; 805 } else if (0 != status && 200 != status) { 806 r->http_status = status; 807 } 808 } 809 810 811 void http_response_backend_error (request_st * const r) { 812 if (r->resp_body_started) { 813 /*(response might have been already started, kill the connection)*/ 814 /*(mode == DIRECT to avoid later call to http_response_backend_done())*/ 815 r->handler_module = NULL; /*(avoid sending final chunked block)*/ 816 r->keep_alive = 0; 817 r->resp_body_finished = 1; 818 } /*(else error status set later by http_response_backend_done())*/ 819 } 820 821 void http_response_backend_done (request_st * const r) { 822 /* (not CON_STATE_ERROR and not CON_STATE_RESPONSE_END, 823 * i.e. not called from handle_connection_close or connection_reset 824 * hooks, except maybe from errdoc handler, which later resets state)*/ 825 switch (r->state) { 826 case CON_STATE_HANDLE_REQUEST: 827 case CON_STATE_READ_POST: 828 if (!r->resp_body_started) { 829 /* Send an error if we haven't sent any data yet */ 830 r->http_status = 500; 831 r->handler_module = NULL; 832 break; 833 } /* else fall through */ 834 case CON_STATE_WRITE: 835 if (!r->resp_body_finished) { 836 http_chunk_close(r); 837 r->resp_body_finished = 1; 838 } 839 default: 840 break; 841 } 842 } 843 844 845 void http_response_upgrade_read_body_unknown(request_st * const r) { 846 /* act as transparent proxy */ 847 if (!(r->conf.stream_request_body & FDEVENT_STREAM_REQUEST)) 848 r->conf.stream_request_body |= 849 (FDEVENT_STREAM_REQUEST_BUFMIN | FDEVENT_STREAM_REQUEST); 850 if (!(r->conf.stream_response_body & FDEVENT_STREAM_RESPONSE)) 851 r->conf.stream_response_body |= 852 (FDEVENT_STREAM_RESPONSE_BUFMIN | FDEVENT_STREAM_RESPONSE); 853 r->conf.stream_request_body |= FDEVENT_STREAM_REQUEST_POLLIN; 854 r->reqbody_length = -2; 855 r->keep_alive = 0; 856 } 857 858 859 static handler_t http_response_process_local_redir(request_st * const r, size_t blen) { 860 /* [RFC3875] The Common Gateway Interface (CGI) Version 1.1 861 * [RFC3875] 6.2.2 Local Redirect Response 862 * 863 * The CGI script can return a URI path and query-string 864 * ('local-pathquery') for a local resource in a Location header field. 865 * This indicates to the server that it should reprocess the request 866 * using the path specified. 867 * 868 * local-redir-response = local-Location NL 869 * 870 * The script MUST NOT return any other header fields or a message-body, 871 * and the server MUST generate the response that it would have produced 872 * in response to a request containing the URL 873 * 874 * scheme "://" server-name ":" server-port local-pathquery 875 * 876 * (Might not have begun to receive body yet, but do skip local-redir 877 * if we already have started receiving a response body (blen > 0)) 878 * (Also, while not required by the RFC, do not send local-redir back 879 * to same URL, since CGI should have handled it internally if it 880 * really wanted to do that internally) 881 */ 882 883 /* r->http_status >= 300 && r->http_status < 400) */ 884 size_t ulen = buffer_string_length(&r->uri.path); 885 const buffer *vb = http_header_response_get(r, HTTP_HEADER_LOCATION, CONST_STR_LEN("Location")); 886 if (NULL != vb 887 && vb->ptr[0] == '/' 888 && (0 != strncmp(vb->ptr, r->uri.path.ptr, ulen) 889 || ( vb->ptr[ulen] != '\0' 890 && vb->ptr[ulen] != '/' 891 && vb->ptr[ulen] != '?')) 892 && 0 == blen 893 && !(r->resp_htags & HTTP_HEADER_STATUS) /*no "Status" or NPH response*/ 894 && 1 == r->resp_headers.used) { 895 if (++r->loops_per_request > 5) { 896 log_error(r->conf.errh, __FILE__, __LINE__, 897 "too many internal loops while processing request: %s", 898 r->target_orig.ptr); 899 r->http_status = 500; /* Internal Server Error */ 900 r->handler_module = NULL; 901 return HANDLER_FINISHED; 902 } 903 904 buffer_copy_buffer(&r->target, vb); 905 906 if (r->reqbody_length) { 907 if (r->reqbody_length 908 != r->reqbody_queue->bytes_in) { 909 r->keep_alive = 0; 910 } 911 r->reqbody_length = 0; 912 chunkqueue_reset(r->reqbody_queue); 913 } 914 915 if (r->http_status != 307 && r->http_status != 308) { 916 /* Note: request body (if any) sent to initial dynamic handler 917 * and is not available to the internal redirect */ 918 r->http_method = HTTP_METHOD_GET; 919 } 920 921 /*(caller must reset request as follows)*/ 922 /*connection_response_reset(r);*/ /*(sets r->http_status = 0)*/ 923 /*plugins_call_connection_reset(r);*/ 924 925 return HANDLER_COMEBACK; 926 } 927 928 return HANDLER_GO_ON; 929 } 930 931 932 static int http_response_process_headers(request_st * const r, http_response_opts * const opts, buffer * const hdrs) { 933 char *ns; 934 const char *s; 935 int line = 0; 936 int status_is_set = 0; 937 938 for (s = hdrs->ptr; NULL != (ns = strchr(s, '\n')); s = ns + 1, ++line) { 939 const char *key, *value; 940 int key_len; 941 enum http_header_e id; 942 943 /* strip the \n */ 944 ns[0] = '\0'; 945 if (ns > s && ns[-1] == '\r') ns[-1] = '\0'; 946 947 if (0 == line && 0 == strncmp(s, "HTTP/1.", 7)) { 948 /* non-parsed headers ... we parse them anyway */ 949 if ((s[7] == '1' || s[7] == '0') && s[8] == ' ') { 950 /* after the space should be a status code for us */ 951 int status = http_header_str_to_code(s+9); 952 if (status >= 100 && status < 1000) { 953 status_is_set = 1; 954 r->resp_htags |= HTTP_HEADER_STATUS; 955 r->http_status = status; 956 } /* else we expected 3 digits and didn't get them */ 957 } 958 959 if (0 == r->http_status) { 960 log_error(r->conf.errh, __FILE__, __LINE__, 961 "invalid HTTP status line: %s", s); 962 r->http_status = 502; /* Bad Gateway */ 963 r->handler_module = NULL; 964 return -1; 965 } 966 967 continue; 968 } 969 970 /* parse the headers */ 971 key = s; 972 if (NULL == (value = strchr(s, ':'))) { 973 /* we expect: "<key>: <value>\r\n" */ 974 continue; 975 } 976 977 key_len = value - key; 978 do { ++value; } while (*value == ' ' || *value == '\t'); /* skip LWS */ 979 id = http_header_hkey_get(key, key_len); 980 981 if (opts->authorizer) { 982 if (0 == r->http_status || 200 == r->http_status) { 983 if (id == HTTP_HEADER_STATUS) { 984 int status = http_header_str_to_code(value); 985 if (status >= 100 && status < 1000) { 986 r->http_status = status; 987 } else { 988 r->http_status = 502; /* Bad Gateway */ 989 break; 990 } 991 } 992 else if (id == HTTP_HEADER_OTHER && key_len > 9 993 && (key[0] & 0xdf) == 'V' 994 && buffer_eq_icase_ssn(key, 995 CONST_STR_LEN("Variable-"))) { 996 http_header_env_append(r, key + 9, key_len - 9, value, strlen(value)); 997 } 998 continue; 999 } 1000 } 1001 1002 switch (id) { 1003 case HTTP_HEADER_STATUS: 1004 { 1005 if (opts->backend == BACKEND_PROXY) break; /*(pass w/o parse)*/ 1006 int status = http_header_str_to_code(value); 1007 if (status >= 100 && status < 1000) { 1008 r->http_status = status; 1009 status_is_set = 1; 1010 } else { 1011 r->http_status = 502; 1012 r->handler_module = NULL; 1013 } 1014 continue; /* do not send Status to client */ 1015 } 1016 break; 1017 case HTTP_HEADER_UPGRADE: 1018 /*(technically, should also verify Connection: upgrade)*/ 1019 /*(flag only for mod_proxy and mod_cgi (for now))*/ 1020 if (opts->backend != BACKEND_PROXY 1021 && opts->backend != BACKEND_CGI) { 1022 id = HTTP_HEADER_OTHER; 1023 } 1024 break; 1025 case HTTP_HEADER_CONNECTION: 1026 if (opts->backend == BACKEND_PROXY) continue; 1027 /*(should parse for tokens and do case-insensitive match for "close" 1028 * but this is an imperfect though simplistic attempt to honor 1029 * backend request to close)*/ 1030 if (NULL != strstr(value, "lose")) r->keep_alive = 0; 1031 break; 1032 case HTTP_HEADER_CONTENT_LENGTH: 1033 r->content_length = strtoul(value, NULL, 10); 1034 if (*value == '+') ++value; 1035 break; 1036 case HTTP_HEADER_TRANSFER_ENCODING: 1037 break; 1038 default: 1039 break; 1040 } 1041 1042 http_header_response_insert(r, id, key, key_len, value, strlen(value)); 1043 } 1044 1045 /* CGI/1.1 rev 03 - 7.2.1.2 */ 1046 /* (proxy requires Status-Line, so never true for proxy)*/ 1047 if (!status_is_set && (r->resp_htags & HTTP_HEADER_LOCATION)) { 1048 r->http_status = 302; 1049 } 1050 1051 return 0; 1052 } 1053 1054 1055 handler_t http_response_parse_headers(request_st * const r, http_response_opts * const opts, buffer * const b) { 1056 /** 1057 * possible formats of response headers: 1058 * 1059 * proxy or NPH (non-parsed headers): 1060 * 1061 * HTTP/1.0 200 Ok\n 1062 * Header: Value\n 1063 * \n 1064 * 1065 * CGI: 1066 * 1067 * Header: Value\n 1068 * Status: 200\n 1069 * \n 1070 * 1071 * and different mixes of \n and \r\n combinations 1072 * 1073 * Some users also forget about CGI and just send a response 1074 * and hope we handle it. No headers, no header-content separator 1075 */ 1076 1077 int is_nph = (0 == strncmp(b->ptr, "HTTP/1.", 7)); /*nph (non-parsed hdrs)*/ 1078 int is_header_end = 0; 1079 size_t last_eol = 0; 1080 size_t i = 0, header_len = buffer_string_length(b); 1081 const char *bstart; 1082 size_t blen; 1083 1084 if (b->ptr[0] == '\n' || (b->ptr[0] == '\r' && b->ptr[1] == '\n')) { 1085 /* no HTTP headers */ 1086 i = (b->ptr[0] == '\n') ? 0 : 1; 1087 is_header_end = 1; 1088 } else if (is_nph || b->ptr[(i = strcspn(b->ptr, ":\n"))] == ':') { 1089 /* HTTP headers */ 1090 ++i; 1091 for (char *c; NULL != (c = strchr(b->ptr+i, '\n')); ++i) { 1092 i = (uintptr_t)(c - b->ptr); 1093 /** 1094 * check if we saw a \n(\r)?\n sequence 1095 */ 1096 if (last_eol > 0 && 1097 ((i - last_eol == 1) || 1098 (i - last_eol == 2 && b->ptr[i - 1] == '\r'))) { 1099 is_header_end = 1; 1100 break; 1101 } 1102 1103 last_eol = i; 1104 } 1105 } else if (i == header_len) { /* (no newline yet; partial header line?) */ 1106 } else if (opts->backend == BACKEND_CGI) { 1107 /* no HTTP headers, but a body (special-case for CGI compat) */ 1108 /* no colon found; does not appear to be HTTP headers */ 1109 if (0 != http_chunk_append_buffer(r, b)) { 1110 return HANDLER_ERROR; 1111 } 1112 r->http_status = 200; /* OK */ 1113 r->resp_body_started = 1; 1114 return HANDLER_GO_ON; 1115 } else { 1116 /* invalid response headers */ 1117 r->http_status = 502; /* Bad Gateway */ 1118 r->handler_module = NULL; 1119 return HANDLER_FINISHED; 1120 } 1121 1122 if (!is_header_end) { 1123 /*(reuse MAX_HTTP_REQUEST_HEADER as max size 1124 * for response headers from backends)*/ 1125 if (header_len > MAX_HTTP_REQUEST_HEADER) { 1126 log_error(r->conf.errh, __FILE__, __LINE__, 1127 "response headers too large for %s", r->uri.path.ptr); 1128 r->http_status = 502; /* Bad Gateway */ 1129 r->handler_module = NULL; 1130 return HANDLER_FINISHED; 1131 } 1132 return HANDLER_GO_ON; 1133 } 1134 1135 /* the body starts after the EOL */ 1136 bstart = b->ptr + (i + 1); 1137 blen = header_len - (i + 1); 1138 1139 /* strip the last \r?\n */ 1140 if (i > 0 && (b->ptr[i - 1] == '\r')) { 1141 i--; 1142 } 1143 1144 buffer_string_set_length(b, i); 1145 1146 if (opts->backend == BACKEND_PROXY && !is_nph) { 1147 /* invalid response Status-Line from HTTP proxy */ 1148 r->http_status = 502; /* Bad Gateway */ 1149 r->handler_module = NULL; 1150 return HANDLER_FINISHED; 1151 } 1152 1153 if (0 != http_response_process_headers(r, opts, b)) { 1154 return HANDLER_ERROR; 1155 } 1156 1157 r->resp_body_started = 1; 1158 1159 if (opts->authorizer 1160 && (r->http_status == 0 || r->http_status == 200)) { 1161 return HANDLER_GO_ON; 1162 } 1163 1164 if (NULL == r->handler_module) { 1165 return HANDLER_FINISHED; 1166 } 1167 1168 if (opts->local_redir && r->http_status >= 300 && r->http_status < 400){ 1169 /*(r->resp_htags & HTTP_HEADER_LOCATION)*/ 1170 handler_t rc = http_response_process_local_redir(r, blen); 1171 if (NULL == r->handler_module) 1172 r->resp_body_started = 0; 1173 if (rc != HANDLER_GO_ON) return rc; 1174 } 1175 1176 if (opts->xsendfile_allow) { 1177 buffer *vb; 1178 /* X-Sendfile2 is deprecated; historical for fastcgi */ 1179 if (opts->backend == BACKEND_FASTCGI 1180 && NULL != (vb = http_header_response_get(r, HTTP_HEADER_OTHER, CONST_STR_LEN("X-Sendfile2")))) { 1181 http_response_xsendfile2(r, vb, opts->xsendfile_docroot); 1182 /* http_header_response_unset() shortcut for HTTP_HEADER_OTHER */ 1183 buffer_clear(vb); /*(do not send to client)*/ 1184 if (NULL == r->handler_module) 1185 r->resp_body_started = 0; 1186 return HANDLER_FINISHED; 1187 } else if (NULL != (vb = http_header_response_get(r, HTTP_HEADER_OTHER, CONST_STR_LEN("X-Sendfile"))) 1188 || (opts->backend == BACKEND_FASTCGI /* X-LIGHTTPD-send-file is deprecated; historical for fastcgi */ 1189 && NULL != (vb = http_header_response_get(r, HTTP_HEADER_OTHER, CONST_STR_LEN("X-LIGHTTPD-send-file"))))) { 1190 http_response_xsendfile(r, vb, opts->xsendfile_docroot); 1191 /* http_header_response_unset() shortcut for HTTP_HEADER_OTHER */ 1192 buffer_clear(vb); /*(do not send to client)*/ 1193 if (NULL == r->handler_module) 1194 r->resp_body_started = 0; 1195 return HANDLER_FINISHED; 1196 } 1197 } 1198 1199 if (blen > 0) { 1200 if (0 != http_chunk_append_mem(r, bstart, blen)) { 1201 return HANDLER_ERROR; 1202 } 1203 } 1204 1205 /* (callback for response headers complete) */ 1206 return (opts->headers) ? opts->headers(r, opts) : HANDLER_GO_ON; 1207 } 1208 1209 1210 handler_t http_response_read(request_st * const r, http_response_opts * const opts, buffer * const b, fdnode * const fdn) { 1211 const int fd = fdn->fd; 1212 while (1) { 1213 ssize_t n; 1214 size_t avail = buffer_string_space(b); 1215 unsigned int toread = 0; 1216 1217 if (0 == fdevent_ioctl_fionread(fd, opts->fdfmt, (int *)&toread)) { 1218 if (avail < toread) { 1219 size_t blen = buffer_string_length(b); 1220 if (toread + blen < 4096) 1221 toread = 4095 - blen; 1222 else if (toread > MAX_READ_LIMIT) 1223 toread = MAX_READ_LIMIT; 1224 } 1225 else if (0 == toread) { 1226 #if 0 1227 return (fdevent_fdnode_interest(fdn) & FDEVENT_IN) 1228 ? HANDLER_FINISHED /* read finished */ 1229 : HANDLER_GO_ON; /* optimistic read; data not ready */ 1230 #else 1231 if (!(fdevent_fdnode_interest(fdn) & FDEVENT_IN)) { 1232 if (!(r->conf.stream_response_body 1233 & FDEVENT_STREAM_RESPONSE_POLLRDHUP)) 1234 return HANDLER_GO_ON;/*optimistic read; data not ready*/ 1235 } 1236 if (0 == avail) /* let read() below indicate if EOF or EAGAIN */ 1237 toread = 1024; 1238 #endif 1239 } 1240 } 1241 else if (avail < 1024) { 1242 toread = 4095 - avail; 1243 } 1244 1245 if (r->conf.stream_response_body & FDEVENT_STREAM_RESPONSE_BUFMIN) { 1246 off_t cqlen = chunkqueue_length(r->write_queue); 1247 if (cqlen + (off_t)toread > 65536 - 4096) { 1248 if (!r->con->is_writable) { 1249 /*(defer removal of FDEVENT_IN interest since 1250 * connection_state_machine() might be able to send data 1251 * immediately, unless !con->is_writable, where 1252 * connection_state_machine() might not loop back to call 1253 * mod_proxy_handle_subrequest())*/ 1254 fdevent_fdnode_event_clr(r->con->srv->ev, fdn, FDEVENT_IN); 1255 } 1256 if (cqlen >= 65536-1) return HANDLER_GO_ON; 1257 toread = 65536 - 1 - (unsigned int)cqlen; 1258 /* Note: heuristic is fuzzy in that it limits how much to read 1259 * from backend based on how much is pending to write to client. 1260 * Modules where data from backend is framed (e.g. FastCGI) may 1261 * want to limit how much is buffered from backend while waiting 1262 * for a complete data frame or data packet from backend. */ 1263 } 1264 } 1265 1266 if (avail < toread) { 1267 /*(add avail+toread to reduce allocations when ioctl EOPNOTSUPP)*/ 1268 avail = avail ? avail - 1 + toread : toread; 1269 buffer_string_prepare_append(b, avail); 1270 } 1271 1272 n = read(fd, b->ptr+buffer_string_length(b), avail); 1273 1274 if (n < 0) { 1275 switch (errno) { 1276 case EAGAIN: 1277 #ifdef EWOULDBLOCK 1278 #if EWOULDBLOCK != EAGAIN 1279 case EWOULDBLOCK: 1280 #endif 1281 #endif 1282 case EINTR: 1283 return HANDLER_GO_ON; 1284 default: 1285 log_perror(r->conf.errh, __FILE__, __LINE__, 1286 "read() %d %d", r->con->fd, fd); 1287 return HANDLER_ERROR; 1288 } 1289 } 1290 1291 buffer_commit(b, (size_t)n); 1292 #ifdef __COVERITY__ 1293 /* Coverity Scan overlooks the effect of buffer_commit() */ 1294 b->ptr[buffer_string_length(b)+n] = '\0'; 1295 #endif 1296 1297 if (NULL != opts->parse) { 1298 handler_t rc = opts->parse(r, opts, b, (size_t)n); 1299 if (rc != HANDLER_GO_ON) return rc; 1300 } else if (0 == n) { 1301 /* note: no further data is sent to backend after read EOF on socket 1302 * (not checking for half-closed TCP socket) 1303 * (backend should read all data desired prior to closing socket, 1304 * though might send app-level close data frame, if applicable) */ 1305 return HANDLER_FINISHED; /* read finished */ 1306 } else if (0 == r->resp_body_started) { 1307 /* split header from body */ 1308 handler_t rc = http_response_parse_headers(r, opts, b); 1309 if (rc != HANDLER_GO_ON) return rc; 1310 /* accumulate response in b until headers completed (or error) */ 1311 if (r->resp_body_started) buffer_clear(b); 1312 } else { 1313 if (0 != http_chunk_append_buffer(r, b)) { 1314 /* error writing to tempfile; 1315 * truncate response or send 500 if nothing sent yet */ 1316 return HANDLER_ERROR; 1317 } 1318 buffer_clear(b); 1319 } 1320 1321 if (r->conf.stream_response_body & FDEVENT_STREAM_RESPONSE_BUFMIN) { 1322 if (chunkqueue_length(r->write_queue) > 65536 - 4096) { 1323 /*(defer removal of FDEVENT_IN interest since 1324 * connection_state_machine() might be able to send 1325 * data immediately, unless !con->is_writable, where 1326 * connection_state_machine() might not loop back to 1327 * call the subrequest handler)*/ 1328 if (!r->con->is_writable) 1329 fdevent_fdnode_event_clr(r->con->srv->ev, fdn, FDEVENT_IN); 1330 break; 1331 } 1332 } 1333 1334 if ((size_t)n < avail) 1335 break; /* emptied kernel read buffer or partial read */ 1336 } 1337 1338 return HANDLER_GO_ON; 1339 } 1340 1341 1342 int http_cgi_headers (request_st * const r, http_cgi_opts * const opts, http_cgi_header_append_cb cb, void *vdata) { 1343 1344 /* CGI-SPEC 6.1.2, FastCGI spec 6.3 and SCGI spec */ 1345 1346 int rc = 0; 1347 const connection * const con = r->con; 1348 server_socket * const srv_sock = con->srv_socket; 1349 buffer * const tb = r->tmp_buf; 1350 const char *s; 1351 size_t n; 1352 char buf[LI_ITOSTRING_LENGTH]; 1353 sock_addr *addr; 1354 sock_addr addrbuf; 1355 char b2[INET6_ADDRSTRLEN + 1]; 1356 1357 /* (CONTENT_LENGTH must be first for SCGI) */ 1358 if (!opts->authorizer) { 1359 rc |= cb(vdata, CONST_STR_LEN("CONTENT_LENGTH"), 1360 buf, li_itostrn(buf,sizeof(buf),r->reqbody_length)); 1361 } 1362 1363 if (!buffer_string_is_empty(&r->uri.query)) { 1364 rc |= cb(vdata, CONST_STR_LEN("QUERY_STRING"), 1365 CONST_BUF_LEN(&r->uri.query)); 1366 } else { 1367 rc |= cb(vdata, CONST_STR_LEN("QUERY_STRING"), 1368 CONST_STR_LEN("")); 1369 } 1370 if (!buffer_string_is_empty(opts->strip_request_uri)) { 1371 /** 1372 * /app1/index/list 1373 * 1374 * stripping /app1 or /app1/ should lead to 1375 * 1376 * /index/list 1377 * 1378 */ 1379 size_t len = buffer_string_length(opts->strip_request_uri); 1380 if ('/' == opts->strip_request_uri->ptr[len-1]) { 1381 --len; 1382 } 1383 1384 if (buffer_string_length(&r->target_orig) >= len 1385 && 0 == memcmp(r->target_orig.ptr, 1386 opts->strip_request_uri->ptr, len) 1387 && r->target_orig.ptr[len] == '/') { 1388 rc |= cb(vdata, CONST_STR_LEN("REQUEST_URI"), 1389 r->target_orig.ptr+len, 1390 buffer_string_length(&r->target_orig)-len); 1391 } else { 1392 rc |= cb(vdata, CONST_STR_LEN("REQUEST_URI"), 1393 CONST_BUF_LEN(&r->target_orig)); 1394 } 1395 } else { 1396 rc |= cb(vdata, CONST_STR_LEN("REQUEST_URI"), 1397 CONST_BUF_LEN(&r->target_orig)); 1398 } 1399 if (!buffer_is_equal(&r->target, &r->target_orig)) { 1400 rc |= cb(vdata, CONST_STR_LEN("REDIRECT_URI"), 1401 CONST_BUF_LEN(&r->target)); 1402 } 1403 /* set REDIRECT_STATUS for php compiled with --force-redirect 1404 * (if REDIRECT_STATUS has not already been set by error handler) */ 1405 if (0 == r->error_handler_saved_status) { 1406 rc |= cb(vdata, CONST_STR_LEN("REDIRECT_STATUS"), 1407 CONST_STR_LEN("200")); 1408 } 1409 1410 /* 1411 * SCRIPT_NAME, PATH_INFO and PATH_TRANSLATED according to 1412 * http://cgi-spec.golux.com/draft-coar-cgi-v11-03-clean.html 1413 * (6.1.14, 6.1.6, 6.1.7) 1414 */ 1415 if (!opts->authorizer) { 1416 rc |= cb(vdata, CONST_STR_LEN("SCRIPT_NAME"), 1417 CONST_BUF_LEN(&r->uri.path)); 1418 if (!buffer_string_is_empty(&r->pathinfo)) { 1419 rc |= cb(vdata, CONST_STR_LEN("PATH_INFO"), 1420 CONST_BUF_LEN(&r->pathinfo)); 1421 /* PATH_TRANSLATED is only defined if PATH_INFO is set */ 1422 if (!buffer_string_is_empty(opts->docroot)) { 1423 buffer_copy_buffer(tb, opts->docroot); 1424 } else { 1425 buffer_copy_buffer(tb, &r->physical.basedir); 1426 } 1427 buffer_append_string_buffer(tb, &r->pathinfo); 1428 rc |= cb(vdata, CONST_STR_LEN("PATH_TRANSLATED"), 1429 CONST_BUF_LEN(tb)); 1430 } 1431 } 1432 1433 /* 1434 * SCRIPT_FILENAME and DOCUMENT_ROOT for php 1435 * The PHP manual http://www.php.net/manual/en/reserved.variables.php 1436 * treatment of PATH_TRANSLATED is different from the one of CGI specs. 1437 * (see php.ini cgi.fix_pathinfo = 1 config parameter) 1438 */ 1439 1440 if (!buffer_string_is_empty(opts->docroot)) { 1441 /* alternate docroot, e.g. for remote FastCGI or SCGI server */ 1442 buffer_copy_buffer(tb, opts->docroot); 1443 buffer_append_string_buffer(tb, &r->uri.path); 1444 rc |= cb(vdata, CONST_STR_LEN("SCRIPT_FILENAME"), 1445 CONST_BUF_LEN(tb)); 1446 rc |= cb(vdata, CONST_STR_LEN("DOCUMENT_ROOT"), 1447 CONST_BUF_LEN(opts->docroot)); 1448 } else { 1449 if (opts->break_scriptfilename_for_php) { 1450 /* php.ini config cgi.fix_pathinfo = 1 need a broken SCRIPT_FILENAME 1451 * to find out what PATH_INFO is itself 1452 * 1453 * see src/sapi/cgi_main.c, init_request_info() 1454 */ 1455 buffer_copy_buffer(tb, &r->physical.path); 1456 buffer_append_string_buffer(tb, &r->pathinfo); 1457 rc |= cb(vdata, CONST_STR_LEN("SCRIPT_FILENAME"), 1458 CONST_BUF_LEN(tb)); 1459 } else { 1460 rc |= cb(vdata, CONST_STR_LEN("SCRIPT_FILENAME"), 1461 CONST_BUF_LEN(&r->physical.path)); 1462 } 1463 rc |= cb(vdata, CONST_STR_LEN("DOCUMENT_ROOT"), 1464 CONST_BUF_LEN(&r->physical.basedir)); 1465 } 1466 1467 s = get_http_method_name(r->http_method); 1468 force_assert(s); 1469 rc |= cb(vdata, CONST_STR_LEN("REQUEST_METHOD"), s, strlen(s)); 1470 1471 s = get_http_version_name(r->http_version); 1472 force_assert(s); 1473 rc |= cb(vdata, CONST_STR_LEN("SERVER_PROTOCOL"), s, strlen(s)); 1474 1475 rc |= cb(vdata, CONST_STR_LEN("SERVER_SOFTWARE"), 1476 CONST_BUF_LEN(r->conf.server_tag)); 1477 1478 rc |= cb(vdata, CONST_STR_LEN("GATEWAY_INTERFACE"), 1479 CONST_STR_LEN("CGI/1.1")); 1480 1481 rc |= cb(vdata, CONST_STR_LEN("REQUEST_SCHEME"), 1482 CONST_BUF_LEN(&r->uri.scheme)); 1483 1484 if (buffer_is_equal_string(&r->uri.scheme, CONST_STR_LEN("https"))) { 1485 rc |= cb(vdata, CONST_STR_LEN("HTTPS"), CONST_STR_LEN("on")); 1486 } 1487 1488 addr = &srv_sock->addr; 1489 rc |= cb(vdata, CONST_STR_LEN("SERVER_PORT"), 1490 buf, li_utostrn(buf,sizeof(buf),sock_addr_get_port(addr))); 1491 1492 switch (addr->plain.sa_family) { 1493 case AF_INET: 1494 case AF_INET6: 1495 if (sock_addr_is_addr_wildcard(addr)) { 1496 socklen_t addrlen = sizeof(addrbuf); 1497 if (0 == getsockname(con->fd,(struct sockaddr *)&addrbuf,&addrlen)){ 1498 addr = &addrbuf; 1499 } else { 1500 s = ""; 1501 break; 1502 } 1503 } 1504 s = sock_addr_inet_ntop(addr, b2, sizeof(b2)-1); 1505 if (NULL == s) s = ""; 1506 break; 1507 default: 1508 s = ""; 1509 break; 1510 } 1511 force_assert(s); 1512 rc |= cb(vdata, CONST_STR_LEN("SERVER_ADDR"), s, strlen(s)); 1513 1514 if (!buffer_string_is_empty(r->server_name)) { 1515 size_t len = buffer_string_length(r->server_name); 1516 1517 if (r->server_name->ptr[0] == '[') { 1518 const char *colon = strstr(r->server_name->ptr, "]:"); 1519 if (colon) len = (colon + 1) - r->server_name->ptr; 1520 } else { 1521 const char *colon = strchr(r->server_name->ptr, ':'); 1522 if (colon) len = colon - r->server_name->ptr; 1523 } 1524 1525 rc |= cb(vdata, CONST_STR_LEN("SERVER_NAME"), 1526 r->server_name->ptr, len); 1527 } else { 1528 /* set to be same as SERVER_ADDR (above) */ 1529 rc |= cb(vdata, CONST_STR_LEN("SERVER_NAME"), s, strlen(s)); 1530 } 1531 1532 rc |= cb(vdata, CONST_STR_LEN("REMOTE_ADDR"), 1533 CONST_BUF_LEN(con->dst_addr_buf)); 1534 1535 rc |= cb(vdata, CONST_STR_LEN("REMOTE_PORT"), buf, 1536 li_utostrn(buf,sizeof(buf),sock_addr_get_port(&con->dst_addr))); 1537 1538 for (n = 0; n < r->rqst_headers.used; n++) { 1539 data_string *ds = (data_string *)r->rqst_headers.data[n]; 1540 if (!buffer_string_is_empty(&ds->value) && !buffer_is_empty(&ds->key)) { 1541 /* Security: Do not emit HTTP_PROXY in environment. 1542 * Some executables use HTTP_PROXY to configure 1543 * outgoing proxy. See also https://httpoxy.org/ */ 1544 if (buffer_is_equal_caseless_string(&ds->key, 1545 CONST_STR_LEN("Proxy"))) { 1546 continue; 1547 } 1548 buffer_copy_string_encoded_cgi_varnames(tb, 1549 CONST_BUF_LEN(&ds->key), 1); 1550 rc |= cb(vdata, CONST_BUF_LEN(tb), 1551 CONST_BUF_LEN(&ds->value)); 1552 } 1553 } 1554 1555 con->srv->request_env(r); 1556 1557 for (n = 0; n < r->env.used; n++) { 1558 data_string *ds = (data_string *)r->env.data[n]; 1559 if (!buffer_is_empty(&ds->value) && !buffer_is_empty(&ds->key)) { 1560 buffer_copy_string_encoded_cgi_varnames(tb, 1561 CONST_BUF_LEN(&ds->key), 0); 1562 rc |= cb(vdata, CONST_BUF_LEN(tb), 1563 CONST_BUF_LEN(&ds->value)); 1564 } 1565 } 1566 1567 return rc; 1568 } 1569