1 #include "first.h" 2 3 #include "base.h" 4 #include "array.h" 5 #include "buffer.h" 6 #include "chunk.h" 7 #include "fdevent.h" 8 #include "log.h" 9 #include "etag.h" 10 #include "http_chunk.h" 11 #include "http_header.h" 12 #include "response.h" 13 #include "sock_addr.h" 14 #include "stat_cache.h" 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 * max size of the HTTP response header from backends 28 * (differs from server.max-request-field-size for max request field size) 29 */ 30 #define MAX_HTTP_RESPONSE_FIELD_SIZE 65535 31 32 33 __attribute_cold__ 34 static int http_response_buffer_append_authority(request_st * const r, buffer * const o) { 35 if (!buffer_string_is_empty(&r->uri.authority)) { 36 buffer_append_string_buffer(o, &r->uri.authority); 37 } else { 38 /* get the name of the currently connected socket */ 39 sock_addr our_addr; 40 socklen_t our_addr_len; 41 42 our_addr.plain.sa_family = 0; 43 our_addr_len = sizeof(our_addr); 44 45 if (-1 == getsockname(r->con->fd, (struct sockaddr *)&our_addr, &our_addr_len) 46 || our_addr_len > (socklen_t)sizeof(our_addr)) { 47 r->http_status = 500; 48 log_perror(r->conf.errh, __FILE__, __LINE__, "can't get sockname"); 49 return -1; 50 } 51 52 if (our_addr.plain.sa_family == AF_INET 53 && our_addr.ipv4.sin_addr.s_addr == htonl(INADDR_LOOPBACK)) { 54 static char lhost[32]; 55 static size_t lhost_len = 0; 56 if (0 != lhost_len) { 57 buffer_append_string_len(o, lhost, lhost_len); 58 } 59 else { 60 size_t olen = buffer_string_length(o); 61 if (0 == sock_addr_nameinfo_append_buffer(o, &our_addr, r->conf.errh)) { 62 lhost_len = buffer_string_length(o) - olen; 63 if (lhost_len < sizeof(lhost)) { 64 memcpy(lhost, o->ptr+olen, lhost_len+1); /*(+1 for '\0')*/ 65 } 66 else { 67 lhost_len = 0; 68 } 69 } 70 else { 71 lhost_len = sizeof("localhost")-1; 72 memcpy(lhost, "localhost", lhost_len+1); /*(+1 for '\0')*/ 73 buffer_append_string_len(o, lhost, lhost_len); 74 } 75 } 76 } else if (!buffer_string_is_empty(r->server_name)) { 77 buffer_append_string_buffer(o, r->server_name); 78 } else 79 /* Lookup name: secondly try to get hostname for bind address */ 80 if (0 != sock_addr_nameinfo_append_buffer(o, &our_addr, r->conf.errh)) { 81 r->http_status = 500; 82 return -1; 83 } 84 85 { 86 unsigned short listen_port = sock_addr_get_port(&our_addr); 87 unsigned short default_port = 80; 88 if (buffer_is_equal_string(&r->uri.scheme, CONST_STR_LEN("https"))) { 89 default_port = 443; 90 } 91 if (0 == listen_port) listen_port = r->con->srv->srvconf.port; 92 if (default_port != listen_port) { 93 buffer_append_string_len(o, CONST_STR_LEN(":")); 94 buffer_append_int(o, listen_port); 95 } 96 } 97 } 98 return 0; 99 } 100 101 int http_response_redirect_to_directory(request_st * const r, int status) { 102 buffer *o = r->tmp_buf; 103 buffer_clear(o); 104 /* XXX: store flag in global at startup? */ 105 if (r->con->srv->srvconf.absolute_dir_redirect) { 106 buffer_copy_buffer(o, &r->uri.scheme); 107 buffer_append_string_len(o, CONST_STR_LEN("://")); 108 if (0 != http_response_buffer_append_authority(r, o)) { 109 return -1; 110 } 111 } 112 buffer_append_string_encoded(o, CONST_BUF_LEN(&r->uri.path), ENCODING_REL_URI); 113 buffer_append_string_len(o, CONST_STR_LEN("/")); 114 if (!buffer_string_is_empty(&r->uri.query)) { 115 buffer_append_string_len(o, CONST_STR_LEN("?")); 116 buffer_append_string_buffer(o, &r->uri.query); 117 } 118 119 if (status >= 300) { 120 http_header_response_set(r, HTTP_HEADER_LOCATION, 121 CONST_STR_LEN("Location"), 122 CONST_BUF_LEN(o)); 123 r->http_status = status; 124 r->resp_body_finished = 1; 125 } 126 else { 127 http_header_response_set(r, HTTP_HEADER_CONTENT_LOCATION, 128 CONST_STR_LEN("Content-Location"), 129 CONST_BUF_LEN(o)); 130 } 131 132 return 0; 133 } 134 135 #define MTIME_CACHE_MAX 16 136 struct mtime_cache_type { 137 time_t mtime; /* key */ 138 buffer str; /* buffer for string representation */ 139 }; 140 static struct mtime_cache_type mtime_cache[MTIME_CACHE_MAX]; 141 static char mtime_cache_str[MTIME_CACHE_MAX][30]; 142 /* 30-chars for "%a, %d %b %Y %H:%M:%S GMT" */ 143 144 void strftime_cache_reset(void) { 145 for (int i = 0; i < MTIME_CACHE_MAX; ++i) { 146 mtime_cache[i].mtime = (time_t)-1; 147 mtime_cache[i].str.ptr = mtime_cache_str[i]; 148 mtime_cache[i].str.used = sizeof(mtime_cache_str[0]); 149 mtime_cache[i].str.size = sizeof(mtime_cache_str[0]); 150 } 151 } 152 153 const buffer * strftime_cache_get(const time_t last_mod) { 154 static int mtime_cache_idx; 155 156 for (int j = 0; j < MTIME_CACHE_MAX; ++j) { 157 if (mtime_cache[j].mtime == last_mod) 158 return &mtime_cache[j].str; /* found cache-entry */ 159 } 160 161 if (++mtime_cache_idx == MTIME_CACHE_MAX) mtime_cache_idx = 0; 162 163 const int i = mtime_cache_idx; 164 mtime_cache[i].mtime = last_mod; 165 strftime(mtime_cache[i].str.ptr, sizeof(mtime_cache_str[0]), 166 "%a, %d %b %Y %H:%M:%S GMT", gmtime(&mtime_cache[i].mtime)); 167 168 return &mtime_cache[i].str; 169 } 170 171 172 int http_response_handle_cachable(request_st * const r, const buffer * const mtime) { 173 const buffer *vb; 174 175 /* 176 * 14.26 If-None-Match 177 * [...] 178 * If none of the entity tags match, then the server MAY perform the 179 * requested method as if the If-None-Match header field did not exist, 180 * but MUST also ignore any If-Modified-Since header field(s) in the 181 * request. That is, if no entity tags match, then the server MUST NOT 182 * return a 304 (Not Modified) response. 183 */ 184 185 if ((vb = http_header_request_get(r, HTTP_HEADER_IF_NONE_MATCH, 186 CONST_STR_LEN("If-None-Match")))) { 187 /*(weak etag comparison must not be used for ranged requests)*/ 188 int range_request = (0 != light_btst(r->rqst_htags, HTTP_HEADER_RANGE)); 189 if (etag_is_equal(&r->physical.etag, vb->ptr, !range_request)) { 190 if (http_method_get_or_head(r->http_method)) { 191 r->http_status = 304; 192 return HANDLER_FINISHED; 193 } else { 194 r->http_status = 412; 195 r->handler_module = NULL; 196 return HANDLER_FINISHED; 197 } 198 } 199 } else if (http_method_get_or_head(r->http_method) 200 && (vb = http_header_request_get(r, HTTP_HEADER_IF_MODIFIED_SINCE, 201 CONST_STR_LEN("If-Modified-Since")))) { 202 /* last-modified handling */ 203 size_t used_len; 204 char *semicolon; 205 206 if (NULL == (semicolon = strchr(vb->ptr, ';'))) { 207 used_len = buffer_string_length(vb); 208 } else { 209 used_len = semicolon - vb->ptr; 210 } 211 212 if (buffer_is_equal_string(mtime, vb->ptr, used_len)) { 213 if ('\0' == mtime->ptr[used_len]) r->http_status = 304; 214 return HANDLER_FINISHED; 215 } else { 216 char buf[sizeof("Sat, 23 Jul 2005 21:20:01 GMT")]; 217 time_t t_header, t_file; 218 struct tm tm; 219 220 /* convert to timestamp */ 221 if (used_len >= sizeof(buf)) return HANDLER_GO_ON; 222 223 memcpy(buf, vb->ptr, used_len); 224 buf[used_len] = '\0'; 225 226 if (NULL == strptime(buf, "%a, %d %b %Y %H:%M:%S GMT", &tm)) { 227 /** 228 * parsing failed, let's get out of here 229 */ 230 return HANDLER_GO_ON; 231 } 232 tm.tm_isdst = 0; 233 t_header = mktime(&tm); 234 235 strptime(mtime->ptr, "%a, %d %b %Y %H:%M:%S GMT", &tm); 236 tm.tm_isdst = 0; 237 t_file = mktime(&tm); 238 239 if (t_file > t_header) return HANDLER_GO_ON; 240 241 r->http_status = 304; 242 return HANDLER_FINISHED; 243 } 244 } 245 246 return HANDLER_GO_ON; 247 } 248 249 250 void http_response_body_clear (request_st * const r, int preserve_length) { 251 r->resp_send_chunked = 0; 252 if (light_btst(r->resp_htags, HTTP_HEADER_TRANSFER_ENCODING)) { 253 http_header_response_unset(r, HTTP_HEADER_TRANSFER_ENCODING, 254 CONST_STR_LEN("Transfer-Encoding")); 255 } 256 if (!preserve_length) { /* preserve for HEAD responses and no-content responses (204, 205, 304) */ 257 if (light_btst(r->resp_htags, HTTP_HEADER_CONTENT_LENGTH)) { 258 http_header_response_unset(r, HTTP_HEADER_CONTENT_LENGTH, 259 CONST_STR_LEN("Content-Length")); 260 } 261 /*(if not preserving Content-Length, do not preserve trailers, if any)*/ 262 r->resp_decode_chunked = 0; 263 if (r->gw_dechunk) { 264 free(r->gw_dechunk->b.ptr); 265 free(r->gw_dechunk); 266 r->gw_dechunk = NULL; 267 } 268 } 269 chunkqueue_reset(&r->write_queue); 270 } 271 272 273 static void http_response_header_clear (request_st * const r) { 274 r->http_status = 0; 275 r->resp_htags = 0; 276 r->resp_header_len = 0; 277 r->resp_header_repeated = 0; 278 array_reset_data_strings(&r->resp_headers); 279 280 /* Note: http_response_body_clear(r, 0) is not called here 281 * r->write_queue should be preserved for additional data after 1xx response 282 * However, if http_response_process_headers() was called and response had 283 * Transfer-Encoding: chunked set, then other items need to be reset */ 284 r->resp_send_chunked = 0; 285 r->resp_decode_chunked = 0; 286 if (r->gw_dechunk) { 287 free(r->gw_dechunk->b.ptr); 288 free(r->gw_dechunk); 289 r->gw_dechunk = NULL; 290 } 291 } 292 293 294 void http_response_reset (request_st * const r) { 295 r->http_status = 0; 296 r->con->is_writable = 1; 297 r->resp_body_finished = 0; 298 r->resp_body_started = 0; 299 r->handler_module = NULL; 300 if (r->physical.path.ptr) { /*(skip for mod_fastcgi authorizer)*/ 301 buffer_clear(&r->physical.doc_root); 302 buffer_clear(&r->physical.basedir); 303 buffer_clear(&r->physical.etag); 304 buffer_reset(&r->physical.path); 305 buffer_reset(&r->physical.rel_path); 306 } 307 r->resp_htags = 0; 308 r->resp_header_len = 0; 309 r->resp_header_repeated = 0; 310 array_reset_data_strings(&r->resp_headers); 311 http_response_body_clear(r, 0); 312 } 313 314 315 handler_t http_response_reqbody_read_error (request_st * const r, int http_status) { 316 r->keep_alive = 0; 317 318 /*(do not change status if response headers already set and possibly sent)*/ 319 if (0 != r->resp_header_len) return HANDLER_ERROR; 320 321 http_response_body_clear(r, 0); 322 r->http_status = http_status; 323 r->handler_module = NULL; 324 return HANDLER_FINISHED; 325 } 326 327 328 static int http_response_coalesce_ranges (off_t * const ranges, int n) 329 { 330 /* coalesce/combine overlapping ranges and ranges separated by a 331 * gap which is smaller than the overhead of sending multiple parts 332 * (typically around 80 bytes) ([RFC7233] 4.1 206 Partial Content) 333 * (ranges are known to be positive, so subtract 80 instead of add 80 334 * to avoid any chance of integer overflow) 335 * (max n should be limited in caller since a malicious set of ranges has 336 * n^2 cost for the simplistic algorithm below) 337 * (sorting the ranges and then combining would lower the cost, but the 338 * cost should not be an issue since client should not send many ranges 339 * and caller should restrict the max number of ranges to limit abuse) 340 * [RFC7233] 4.1 206 Partial Content recommends: 341 * When a multipart response payload is generated, the server SHOULD send 342 * the parts in the same order that the corresponding byte-range-spec 343 * appeared in the received Range header field, excluding those ranges 344 * that were deemed unsatisfiable or that were coalesced into other ranges 345 */ 346 for (int i = 0; i+2 < n; i += 2) { 347 const off_t b = ranges[i]; 348 const off_t e = ranges[i+1]; 349 for (int j = i+2; j < n; j += 2) { 350 /* common case: ranges do not overlap */ 351 if (b <= ranges[j] ? e < ranges[j]-80 : ranges[j+1] < b-80) 352 continue; 353 /* else ranges do overlap, so combine into first range */ 354 ranges[i] = b <= ranges[j] ? b : ranges[j]; 355 ranges[i+1] = e >= ranges[j+1] ? e : ranges[j+1]; 356 memmove(ranges+j, ranges+j+2, (n-j-2)*sizeof(off_t)); 357 /* restart outer loop from beginning */ 358 n -= 2; 359 i = -2; 360 break; 361 } 362 } 363 364 return n; 365 } 366 367 368 static int http_response_parse_range(request_st * const r, stat_cache_entry * const sce, const char * const range) { 369 int n = 0; 370 int error; 371 off_t start, end; 372 const off_t st_size = sce->st.st_size; 373 const char *s, *minus; 374 static const char boundary[] = "fkj49sn38dcn3"; 375 const buffer *content_type = 376 http_header_response_get(r, HTTP_HEADER_CONTENT_TYPE, 377 CONST_STR_LEN("Content-Type")); 378 off_t ranges[16]; 379 380 start = 0; 381 end = st_size - 1; 382 383 for (s = range, error = 0; 384 !error && *s && NULL != (minus = strchr(s, '-')); ) { 385 char *err; 386 off_t la = 0, le; 387 *((const char **)&err) = s; /*(quiet clang --analyze)*/ 388 389 if (s != minus) { 390 la = strtoll(s, &err, 10); 391 if (err != minus) { 392 /* should not have multiple range-unit in Range, but 393 * handle just in case multiple Range headers merged */ 394 while (*s == ' ' || *s == '\t') ++s; 395 if (0 != strncmp(s, "bytes=", 6)) return -1; 396 s += 6; 397 if (s != minus) { 398 la = strtoll(s, &err, 10); 399 if (err != minus) return -1; 400 } 401 } 402 } 403 404 if (s == minus) { 405 /* -<stop> */ 406 407 le = strtoll(s, &err, 10); 408 409 if (le == 0) { 410 /* RFC 2616 - 14.35.1 */ 411 412 r->http_status = 416; 413 error = 1; 414 } else if (*err == '\0') { 415 /* end */ 416 s = err; 417 418 end = st_size - 1; 419 start = st_size + le; 420 } else if (*err == ',') { 421 s = err + 1; 422 423 end = st_size - 1; 424 start = st_size + le; 425 } else { 426 error = 1; 427 } 428 429 } else if (*(minus+1) == '\0' || *(minus+1) == ',') { 430 /* <start>- */ 431 432 /* ok */ 433 434 if (*(err + 1) == '\0') { 435 s = err + 1; 436 437 end = st_size - 1; 438 start = la; 439 440 } else if (*(err + 1) == ',') { 441 s = err + 2; 442 443 end = st_size - 1; 444 start = la; 445 } else { 446 error = 1; 447 } 448 } else { 449 /* <start>-<stop> */ 450 451 le = strtoll(minus+1, &err, 10); 452 453 /* RFC 2616 - 14.35.1 */ 454 if (la > le) { 455 error = 1; 456 } 457 458 if (*err == '\0') { 459 /* ok, end*/ 460 s = err; 461 462 end = le; 463 start = la; 464 } else if (*err == ',') { 465 s = err + 1; 466 467 end = le; 468 start = la; 469 } else { 470 /* error */ 471 472 error = 1; 473 } 474 } 475 476 if (!error) { 477 if (start < 0) start = 0; 478 479 /* RFC 2616 - 14.35.1 */ 480 if (end > st_size - 1) end = st_size - 1; 481 482 if (start > st_size - 1) { 483 error = 1; 484 485 r->http_status = 416; 486 } 487 } 488 489 if (!error) { 490 if (n < (int)(sizeof(ranges)/sizeof(*ranges))) { 491 ranges[n] = start; 492 ranges[n+1] = end; 493 n += 2; 494 } 495 else { /* excessive num ranges in request */ 496 error = 1; 497 r->http_status = 416; 498 } 499 } 500 } 501 502 /* something went wrong */ 503 if (error) return -1; 504 505 if (n > 2) n = http_response_coalesce_ranges(ranges, n); 506 507 for (int i = 0; i < n; i += 2) { 508 start = ranges[i]; 509 end = ranges[i+1]; 510 if (n > 2) { 511 /* write boundary-header */ 512 buffer *b = r->tmp_buf; 513 buffer_copy_string_len(b, CONST_STR_LEN("\r\n--")); 514 buffer_append_string_len(b, boundary, sizeof(boundary)-1); 515 516 /* write Content-Range */ 517 buffer_append_string_len(b, CONST_STR_LEN("\r\nContent-Range: bytes ")); 518 buffer_append_int(b, start); 519 buffer_append_string_len(b, CONST_STR_LEN("-")); 520 buffer_append_int(b, end); 521 buffer_append_string_len(b, CONST_STR_LEN("/")); 522 buffer_append_int(b, st_size); 523 524 if (content_type) { 525 buffer_append_string_len(b, CONST_STR_LEN("\r\nContent-Type: ")); 526 buffer_append_string_buffer(b, content_type); 527 } 528 529 /* write END-OF-HEADER */ 530 buffer_append_string_len(b, CONST_STR_LEN("\r\n\r\n")); 531 http_chunk_append_mem(r, CONST_BUF_LEN(b)); 532 } 533 534 http_chunk_append_file_ref_range(r, sce, start, end - start + 1); 535 } 536 537 buffer * const tb = r->tmp_buf; 538 539 if (n > 2) { 540 /* add boundary end */ 541 buffer_copy_string_len(tb, "\r\n--", 4); 542 buffer_append_string_len(tb, boundary, sizeof(boundary)-1); 543 buffer_append_string_len(tb, "--\r\n", 4); 544 http_chunk_append_mem(r, CONST_BUF_LEN(tb)); 545 546 /* set header-fields */ 547 548 buffer_copy_string_len(tb, CONST_STR_LEN("multipart/byteranges; boundary=")); 549 buffer_append_string_len(tb, boundary, sizeof(boundary)-1); 550 551 /* overwrite content-type */ 552 http_header_response_set(r, HTTP_HEADER_CONTENT_TYPE, 553 CONST_STR_LEN("Content-Type"), 554 CONST_BUF_LEN(tb)); 555 } else { 556 /* add Content-Range-header */ 557 558 buffer_copy_string_len(tb, CONST_STR_LEN("bytes ")); 559 buffer_append_int(tb, start); 560 buffer_append_string_len(tb, CONST_STR_LEN("-")); 561 buffer_append_int(tb, end); 562 buffer_append_string_len(tb, CONST_STR_LEN("/")); 563 buffer_append_int(tb, st_size); 564 565 http_header_response_set(r, HTTP_HEADER_CONTENT_RANGE, 566 CONST_STR_LEN("Content-Range"), 567 CONST_BUF_LEN(tb)); 568 } 569 570 /* ok, the file is set-up */ 571 return 0; 572 } 573 574 575 void http_response_send_file (request_st * const r, buffer * const path) { 576 stat_cache_entry * const sce = stat_cache_get_entry_open(path, r->conf.follow_symlink); 577 const buffer *mtime = NULL; 578 const buffer *vb; 579 int allow_caching = (0 == r->http_status || 200 == r->http_status); 580 581 if (NULL == sce) { 582 r->http_status = (errno == ENOENT) ? 404 : 403; 583 log_error(r->conf.errh, __FILE__, __LINE__, 584 "not a regular file: %s -> %s", r->uri.path.ptr, path->ptr); 585 return; 586 } 587 588 if (!r->conf.follow_symlink 589 && 0 != stat_cache_path_contains_symlink(path, r->conf.errh)) { 590 r->http_status = 403; 591 if (r->conf.log_request_handling) { 592 log_error(r->conf.errh, __FILE__, __LINE__, 593 "-- access denied due symlink restriction"); 594 log_error(r->conf.errh, __FILE__, __LINE__, 595 "Path : %s", path->ptr); 596 } 597 return; 598 } 599 600 /* we only handle regular files */ 601 if (!S_ISREG(sce->st.st_mode)) { 602 r->http_status = 403; 603 if (r->conf.log_file_not_found) { 604 log_error(r->conf.errh, __FILE__, __LINE__, 605 "not a regular file: %s -> %s", 606 r->uri.path.ptr, path->ptr); 607 } 608 return; 609 } 610 611 if (sce->fd < 0 && 0 != sce->st.st_size) { 612 r->http_status = (errno == ENOENT) ? 404 : 403; 613 if (r->conf.log_request_handling) { 614 log_perror(r->conf.errh, __FILE__, __LINE__, 615 "file open failed: %s", path->ptr); 616 } 617 return; 618 } 619 620 /* set response content-type, if not set already */ 621 622 if (!light_btst(r->resp_htags, HTTP_HEADER_CONTENT_TYPE)) { 623 const buffer *content_type = stat_cache_content_type_get(sce, r); 624 if (buffer_string_is_empty(content_type)) { 625 /* we are setting application/octet-stream, but also announce that 626 * this header field might change in the seconds few requests 627 * 628 * This should fix the aggressive caching of FF and the script download 629 * seen by the first installations 630 */ 631 http_header_response_set(r, HTTP_HEADER_CONTENT_TYPE, 632 CONST_STR_LEN("Content-Type"), 633 CONST_STR_LEN("application/octet-stream")); 634 635 allow_caching = 0; 636 } else { 637 http_header_response_set(r, HTTP_HEADER_CONTENT_TYPE, 638 CONST_STR_LEN("Content-Type"), 639 CONST_BUF_LEN(content_type)); 640 } 641 } 642 643 if (!http_method_get_or_head(r->http_method) 644 || r->http_version < HTTP_VERSION_1_1) 645 r->conf.range_requests = 0; 646 if (r->conf.range_requests) { 647 http_header_response_append(r, HTTP_HEADER_ACCEPT_RANGES, 648 CONST_STR_LEN("Accept-Ranges"), 649 CONST_STR_LEN("bytes")); 650 } 651 652 if (allow_caching) { 653 if (!light_btst(r->resp_htags, HTTP_HEADER_ETAG) 654 && 0 != r->conf.etag_flags) { 655 const buffer *etag = 656 stat_cache_etag_get(sce, r->conf.etag_flags); 657 if (!buffer_string_is_empty(etag)) { 658 /* generate e-tag */ 659 etag_mutate(&r->physical.etag, etag); 660 http_header_response_set(r, HTTP_HEADER_ETAG, 661 CONST_STR_LEN("ETag"), 662 CONST_BUF_LEN(&r->physical.etag)); 663 } 664 } 665 666 /* prepare header */ 667 mtime = http_header_response_get(r, HTTP_HEADER_LAST_MODIFIED, 668 CONST_STR_LEN("Last-Modified")); 669 if (NULL == mtime) { 670 mtime = strftime_cache_get(sce->st.st_mtime); 671 http_header_response_set(r, HTTP_HEADER_LAST_MODIFIED, 672 CONST_STR_LEN("Last-Modified"), 673 CONST_BUF_LEN(mtime)); 674 } 675 676 if (HANDLER_FINISHED == http_response_handle_cachable(r, mtime)) { 677 return; 678 } 679 } 680 681 if (0 == sce->st.st_size) { 682 r->http_status = 200; 683 r->resp_body_finished = 1; 684 /*(Transfer-Encoding should not have been set at this point)*/ 685 http_header_response_set(r, HTTP_HEADER_CONTENT_LENGTH, 686 CONST_STR_LEN("Content-Length"), 687 CONST_STR_LEN("0")); 688 return; 689 } 690 691 if (r->conf.range_requests 692 && (200 == r->http_status || 0 == r->http_status) 693 && NULL != (vb = http_header_request_get(r, HTTP_HEADER_RANGE, 694 CONST_STR_LEN("Range"))) 695 && !light_btst(r->resp_htags, HTTP_HEADER_CONTENT_ENCODING)) { 696 const buffer *range = vb; 697 int do_range_request = 1; 698 /* check if we have a conditional GET */ 699 700 if (NULL != (vb = http_header_request_get(r, HTTP_HEADER_IF_RANGE, 701 CONST_STR_LEN("If-Range")))) { 702 /* if the value is the same as our ETag, we do a Range-request, 703 * otherwise a full 200 */ 704 705 if (vb->ptr[0] == '"') { 706 /** 707 * client wants a ETag 708 */ 709 if (!buffer_is_equal(vb, &r->physical.etag)) { 710 do_range_request = 0; 711 } 712 } else if (!mtime) { 713 /** 714 * we don't have a Last-Modified and can match the If-Range: 715 * 716 * sending all 717 */ 718 do_range_request = 0; 719 } else if (!buffer_is_equal(vb, mtime)) { 720 do_range_request = 0; 721 } 722 } 723 724 if (do_range_request 725 && !buffer_string_is_empty(range) 726 && 0 == strncmp(range->ptr, "bytes=", 6)) { 727 /* support only "bytes" byte-unit */ 728 /* content prepared, I'm done */ 729 r->resp_body_finished = 1; 730 731 if (0 == http_response_parse_range(r, sce, range->ptr+6)) { 732 r->http_status = 206; 733 } 734 return; 735 } 736 } 737 738 /* if we are still here, prepare body */ 739 740 /* we add it here for all requests 741 * the HEAD request will drop it afterwards again 742 */ 743 744 if (0 == http_chunk_append_file_ref(r, sce)) { 745 r->http_status = 200; 746 r->resp_body_finished = 1; 747 /*(Transfer-Encoding should not have been set at this point)*/ 748 buffer * const tb = r->tmp_buf; 749 buffer_clear(tb); 750 buffer_append_int(tb, sce->st.st_size); 751 http_header_response_set(r, HTTP_HEADER_CONTENT_LENGTH, 752 CONST_STR_LEN("Content-Length"), 753 CONST_BUF_LEN(tb)); 754 } 755 else { 756 r->http_status = 500; 757 } 758 } 759 760 761 static void http_response_xsendfile (request_st * const r, buffer * const path, const array * const xdocroot) { 762 const int status = r->http_status; 763 int valid = 1; 764 765 /* reset Content-Length, if set by backend 766 * Content-Length might later be set to size of X-Sendfile static file, 767 * determined by open(), fstat() to reduces race conditions if the file 768 * is modified between stat() (stat_cache_get_entry()) and open(). */ 769 if (light_btst(r->resp_htags, HTTP_HEADER_CONTENT_LENGTH)) { 770 http_header_response_unset(r, HTTP_HEADER_CONTENT_LENGTH, 771 CONST_STR_LEN("Content-Length")); 772 } 773 774 buffer_urldecode_path(path); 775 if (!buffer_is_valid_UTF8(path)) { 776 log_error(r->conf.errh, __FILE__, __LINE__, 777 "X-Sendfile invalid UTF-8 after url-decode: %s", path->ptr); 778 if (r->http_status < 400) { 779 r->http_status = 502; 780 r->handler_module = NULL; 781 } 782 return; 783 } 784 buffer_path_simplify(path, path); 785 if (r->conf.force_lowercase_filenames) { 786 buffer_to_lower(path); 787 } 788 789 /* check that path is under xdocroot(s) 790 * - xdocroot should have trailing slash appended at config time 791 * - r->conf.force_lowercase_filenames is not a server-wide setting, 792 * and so can not be definitively applied to xdocroot at config time*/ 793 if (xdocroot) { 794 size_t i, xlen = buffer_string_length(path); 795 for (i = 0; i < xdocroot->used; ++i) { 796 data_string *ds = (data_string *)xdocroot->data[i]; 797 size_t dlen = buffer_string_length(&ds->value); 798 if (dlen <= xlen 799 && (!r->conf.force_lowercase_filenames 800 ? 0 == memcmp(path->ptr, ds->value.ptr, dlen) 801 : buffer_eq_icase_ssn(path->ptr, ds->value.ptr, dlen))) { 802 break; 803 } 804 } 805 if (i == xdocroot->used && 0 != i) { 806 log_error(r->conf.errh, __FILE__, __LINE__, 807 "X-Sendfile (%s) not under configured x-sendfile-docroot(s)", path->ptr); 808 r->http_status = 403; 809 valid = 0; 810 } 811 } 812 813 if (valid) http_response_send_file(r, path); 814 815 if (r->http_status >= 400 && status < 300) { 816 r->handler_module = NULL; 817 } else if (0 != status && 200 != status) { 818 r->http_status = status; 819 } 820 } 821 822 823 static void http_response_xsendfile2(request_st * const r, const buffer * const value, const array * const xdocroot) { 824 const char *pos = value->ptr; 825 buffer * const b = r->tmp_buf; 826 const int status = r->http_status; 827 828 /* reset Content-Length, if set by backend */ 829 if (light_btst(r->resp_htags, HTTP_HEADER_CONTENT_LENGTH)) { 830 http_header_response_unset(r, HTTP_HEADER_CONTENT_LENGTH, 831 CONST_STR_LEN("Content-Length")); 832 } 833 834 while (*pos) { 835 const char *filename, *range; 836 stat_cache_entry *sce; 837 off_t begin_range, end_range, range_len; 838 839 while (' ' == *pos) pos++; 840 if (!*pos) break; 841 842 filename = pos; 843 if (NULL == (range = strchr(pos, ' '))) { 844 /* missing range */ 845 log_error(r->conf.errh, __FILE__, __LINE__, 846 "Couldn't find range after filename: %s", filename); 847 r->http_status = 502; 848 break; 849 } 850 buffer_copy_string_len(b, filename, range - filename); 851 852 /* find end of range */ 853 for (pos = ++range; *pos && *pos != ' ' && *pos != ','; pos++) ; 854 855 buffer_urldecode_path(b); 856 if (!buffer_is_valid_UTF8(b)) { 857 log_error(r->conf.errh, __FILE__, __LINE__, 858 "X-Sendfile2 invalid UTF-8 after url-decode: %s", b->ptr); 859 r->http_status = 502; 860 break; 861 } 862 buffer_path_simplify(b, b); 863 if (r->conf.force_lowercase_filenames) { 864 buffer_to_lower(b); 865 } 866 if (xdocroot) { 867 size_t i, xlen = buffer_string_length(b); 868 for (i = 0; i < xdocroot->used; ++i) { 869 data_string *ds = (data_string *)xdocroot->data[i]; 870 size_t dlen = buffer_string_length(&ds->value); 871 if (dlen <= xlen 872 && (!r->conf.force_lowercase_filenames 873 ? 0 == memcmp(b->ptr, ds->value.ptr, dlen) 874 : buffer_eq_icase_ssn(b->ptr, ds->value.ptr, dlen))) { 875 break; 876 } 877 } 878 if (i == xdocroot->used && 0 != i) { 879 log_error(r->conf.errh, __FILE__, __LINE__, 880 "X-Sendfile2 (%s) not under configured x-sendfile-docroot(s)", 881 b->ptr); 882 r->http_status = 403; 883 break; 884 } 885 } 886 887 sce = stat_cache_get_entry_open(b, r->conf.follow_symlink); 888 if (NULL == sce) { 889 log_error(r->conf.errh, __FILE__, __LINE__, 890 "send-file error: couldn't get stat_cache entry for " 891 "X-Sendfile2: %s", b->ptr); 892 r->http_status = 404; 893 break; 894 } else if (!S_ISREG(sce->st.st_mode)) { 895 log_error(r->conf.errh, __FILE__, __LINE__, 896 "send-file error: wrong filetype for X-Sendfile2: %s", b->ptr); 897 r->http_status = 502; 898 break; 899 } 900 /* found the file */ 901 902 /* parse range */ 903 end_range = sce->st.st_size - 1; 904 { 905 char *rpos = NULL; 906 errno = 0; 907 begin_range = strtoll(range, &rpos, 10); 908 if (errno != 0 || begin_range < 0 || rpos == range) 909 goto range_failed; 910 if ('-' != *rpos++) goto range_failed; 911 if (rpos != pos) { 912 range = rpos; 913 end_range = strtoll(range, &rpos, 10); 914 if (errno != 0 || end_range < 0 || rpos == range) 915 goto range_failed; 916 } 917 if (rpos != pos) goto range_failed; 918 919 goto range_success; 920 921 range_failed: 922 log_error(r->conf.errh, __FILE__, __LINE__, 923 "Couldn't decode range after filename: %s", filename); 924 r->http_status = 502; 925 break; 926 927 range_success: ; 928 } 929 930 /* no parameters accepted */ 931 932 while (*pos == ' ') pos++; 933 if (*pos != '\0' && *pos != ',') { 934 r->http_status = 502; 935 break; 936 } 937 938 range_len = end_range - begin_range + 1; 939 if (range_len < 0) { 940 r->http_status = 502; 941 break; 942 } 943 if (range_len != 0) { 944 http_chunk_append_file_ref_range(r, sce, begin_range, range_len); 945 } 946 947 if (*pos == ',') pos++; 948 } 949 950 if (r->http_status >= 400 && status < 300) { 951 r->handler_module = NULL; 952 } else if (0 != status && 200 != status) { 953 r->http_status = status; 954 } 955 } 956 957 958 void http_response_backend_error (request_st * const r) { 959 if (r->resp_body_started) { 960 /*(response might have been already started, kill the connection)*/ 961 /*(mode == DIRECT to avoid later call to http_response_backend_done())*/ 962 r->handler_module = NULL; /*(avoid sending final chunked block)*/ 963 r->keep_alive = 0; 964 r->resp_body_finished = 1; 965 } /*(else error status set later by http_response_backend_done())*/ 966 } 967 968 void http_response_backend_done (request_st * const r) { 969 /* (not CON_STATE_ERROR and not CON_STATE_RESPONSE_END, 970 * i.e. not called from handle_connection_close or handle_request_reset 971 * hooks, except maybe from errdoc handler, which later resets state)*/ 972 switch (r->state) { 973 case CON_STATE_HANDLE_REQUEST: 974 case CON_STATE_READ_POST: 975 if (!r->resp_body_started) { 976 /* Send an error if we haven't sent any data yet */ 977 r->http_status = 500; 978 r->handler_module = NULL; 979 break; 980 } /* else fall through */ 981 case CON_STATE_WRITE: 982 if (!r->resp_body_finished) { 983 if (r->http_version == HTTP_VERSION_1_1) 984 http_chunk_close(r); 985 r->resp_body_finished = 1; 986 } 987 default: 988 break; 989 } 990 } 991 992 993 void http_response_upgrade_read_body_unknown(request_st * const r) { 994 /* act as transparent proxy */ 995 if (!(r->conf.stream_request_body & FDEVENT_STREAM_REQUEST)) 996 r->conf.stream_request_body |= 997 (FDEVENT_STREAM_REQUEST_BUFMIN | FDEVENT_STREAM_REQUEST); 998 if (!(r->conf.stream_response_body & FDEVENT_STREAM_RESPONSE)) 999 r->conf.stream_response_body |= 1000 (FDEVENT_STREAM_RESPONSE_BUFMIN | FDEVENT_STREAM_RESPONSE); 1001 r->conf.stream_request_body |= FDEVENT_STREAM_REQUEST_POLLIN; 1002 r->reqbody_length = -2; 1003 r->keep_alive = 0; 1004 } 1005 1006 1007 static handler_t http_response_process_local_redir(request_st * const r, size_t blen) { 1008 /* [RFC3875] The Common Gateway Interface (CGI) Version 1.1 1009 * [RFC3875] 6.2.2 Local Redirect Response 1010 * 1011 * The CGI script can return a URI path and query-string 1012 * ('local-pathquery') for a local resource in a Location header field. 1013 * This indicates to the server that it should reprocess the request 1014 * using the path specified. 1015 * 1016 * local-redir-response = local-Location NL 1017 * 1018 * The script MUST NOT return any other header fields or a message-body, 1019 * and the server MUST generate the response that it would have produced 1020 * in response to a request containing the URL 1021 * 1022 * scheme "://" server-name ":" server-port local-pathquery 1023 * 1024 * (Might not have begun to receive body yet, but do skip local-redir 1025 * if we already have started receiving a response body (blen > 0)) 1026 * (Also, while not required by the RFC, do not send local-redir back 1027 * to same URL, since CGI should have handled it internally if it 1028 * really wanted to do that internally) 1029 */ 1030 1031 /* r->http_status >= 300 && r->http_status < 400) */ 1032 size_t ulen = buffer_string_length(&r->uri.path); 1033 const buffer *vb = http_header_response_get(r, HTTP_HEADER_LOCATION, 1034 CONST_STR_LEN("Location")); 1035 if (NULL != vb 1036 && vb->ptr[0] == '/' 1037 && (0 != strncmp(vb->ptr, r->uri.path.ptr, ulen) 1038 || ( vb->ptr[ulen] != '\0' 1039 && vb->ptr[ulen] != '/' 1040 && vb->ptr[ulen] != '?')) 1041 && 0 == blen /*no "Status" or NPH response*/ 1042 && !light_btst(r->resp_htags, HTTP_HEADER_STATUS) 1043 && 1 == r->resp_headers.used) { 1044 if (++r->loops_per_request > 5) { 1045 log_error(r->conf.errh, __FILE__, __LINE__, 1046 "too many internal loops while processing request: %s", 1047 r->target_orig.ptr); 1048 r->http_status = 500; /* Internal Server Error */ 1049 r->handler_module = NULL; 1050 return HANDLER_FINISHED; 1051 } 1052 1053 buffer_copy_buffer(&r->target, vb); 1054 1055 if (r->reqbody_length) { 1056 if (r->reqbody_length != r->reqbody_queue.bytes_in) 1057 r->keep_alive = 0; 1058 r->reqbody_length = 0; 1059 chunkqueue_reset(&r->reqbody_queue); 1060 } 1061 1062 if (r->http_status != 307 && r->http_status != 308) { 1063 /* Note: request body (if any) sent to initial dynamic handler 1064 * and is not available to the internal redirect */ 1065 r->http_method = HTTP_METHOD_GET; 1066 } 1067 1068 /*(caller must reset request as follows)*/ 1069 /*http_response_reset(r);*/ /*(sets r->http_status = 0)*/ 1070 /*plugins_call_handle_request_reset(r);*/ 1071 1072 return HANDLER_COMEBACK; 1073 } 1074 1075 return HANDLER_GO_ON; 1076 } 1077 1078 1079 static int http_response_process_headers(request_st * const r, http_response_opts * const opts, buffer * const hdrs) { 1080 char *ns; 1081 const char *s; 1082 int line = 0; 1083 int status_is_set = 0; 1084 1085 for (s = hdrs->ptr; NULL != (ns = strchr(s, '\n')); s = ns + 1, ++line) { 1086 const char *key, *value; 1087 int key_len; 1088 enum http_header_e id; 1089 1090 /* strip the \n */ 1091 ns[0] = '\0'; 1092 if (ns > s && ns[-1] == '\r') ns[-1] = '\0'; 1093 1094 if (0 == line && 0 == strncmp(s, "HTTP/1.", 7)) { 1095 /* non-parsed headers ... we parse them anyway */ 1096 if ((s[7] == '1' || s[7] == '0') && s[8] == ' ') { 1097 /* after the space should be a status code for us */ 1098 int status = http_header_str_to_code(s+9); 1099 if (status >= 100 && status < 1000) { 1100 status_is_set = 1; 1101 light_bset(r->resp_htags, HTTP_HEADER_STATUS); 1102 r->http_status = status; 1103 } /* else we expected 3 digits and didn't get them */ 1104 } 1105 1106 if (0 == r->http_status) { 1107 log_error(r->conf.errh, __FILE__, __LINE__, 1108 "invalid HTTP status line: %s", s); 1109 r->http_status = 502; /* Bad Gateway */ 1110 r->handler_module = NULL; 1111 return -1; 1112 } 1113 1114 continue; 1115 } 1116 1117 /* parse the headers */ 1118 key = s; 1119 if (NULL == (value = strchr(s, ':'))) { 1120 /* we expect: "<key>: <value>\r\n" */ 1121 continue; 1122 } 1123 1124 key_len = value - key; 1125 if (0 == key_len) continue; /*(already ignored when writing response)*/ 1126 do { ++value; } while (*value == ' ' || *value == '\t'); /* skip LWS */ 1127 id = http_header_hkey_get(key, key_len); 1128 1129 if (opts->authorizer) { 1130 if (0 == r->http_status || 200 == r->http_status) { 1131 if (id == HTTP_HEADER_STATUS) { 1132 int status = http_header_str_to_code(value); 1133 if (status >= 100 && status < 1000) { 1134 r->http_status = status; 1135 } else { 1136 r->http_status = 502; /* Bad Gateway */ 1137 break; 1138 } 1139 } 1140 else if (id == HTTP_HEADER_OTHER && key_len > 9 1141 && (key[0] & 0xdf) == 'V' 1142 && buffer_eq_icase_ssn(key, 1143 CONST_STR_LEN("Variable-"))) { 1144 http_header_env_append(r, key + 9, key_len - 9, value, strlen(value)); 1145 } 1146 continue; 1147 } 1148 } 1149 1150 switch (id) { 1151 case HTTP_HEADER_STATUS: 1152 { 1153 if (opts->backend == BACKEND_PROXY) break; /*(pass w/o parse)*/ 1154 int status = http_header_str_to_code(value); 1155 if (status >= 100 && status < 1000) { 1156 r->http_status = status; 1157 status_is_set = 1; 1158 } else { 1159 r->http_status = 502; 1160 r->handler_module = NULL; 1161 } 1162 continue; /* do not send Status to client */ 1163 } 1164 break; 1165 case HTTP_HEADER_UPGRADE: 1166 /*(technically, should also verify Connection: upgrade)*/ 1167 /*(flag only for mod_proxy and mod_cgi (for now))*/ 1168 if (opts->backend != BACKEND_PROXY && opts->backend != BACKEND_CGI) 1169 continue; 1170 if (r->http_version >= HTTP_VERSION_2) continue; 1171 break; 1172 case HTTP_HEADER_CONNECTION: 1173 if (opts->backend == BACKEND_PROXY) continue; 1174 /*(should parse for tokens and do case-insensitive match for "close" 1175 * but this is an imperfect though simplistic attempt to honor 1176 * backend request to close)*/ 1177 if (NULL != strstr(value, "lose")) r->keep_alive = 0; 1178 if (r->http_version >= HTTP_VERSION_2) continue; 1179 break; 1180 case HTTP_HEADER_CONTENT_LENGTH: 1181 if (*value == '+') ++value; 1182 break; 1183 case HTTP_HEADER_TRANSFER_ENCODING: 1184 /*(assumes "Transfer-Encoding: chunked"; does not verify)*/ 1185 r->resp_decode_chunked = 1; 1186 r->gw_dechunk = calloc(1, sizeof(response_dechunk)); 1187 /* XXX: future: might consider using chunk_buffer_acquire() 1188 * and chunk_buffer_release() for r->gw_dechunk->b */ 1189 force_assert(r->gw_dechunk); 1190 continue; 1191 case HTTP_HEADER_HTTP2_SETTINGS: 1192 /* RFC7540 3.2.1 1193 * A server MUST NOT send this header field. */ 1194 /* (not bothering to remove HTTP2-Settings from Connection) */ 1195 continue; 1196 default: 1197 break; 1198 } 1199 1200 http_header_response_insert(r, id, key, key_len, value, strlen(value)); 1201 } 1202 1203 /* CGI/1.1 rev 03 - 7.2.1.2 */ 1204 /* (proxy requires Status-Line, so never true for proxy)*/ 1205 if (!status_is_set && light_btst(r->resp_htags, HTTP_HEADER_LOCATION)) { 1206 r->http_status = 302; 1207 } 1208 1209 return 0; 1210 } 1211 1212 1213 static http_response_send_1xx_cb http_response_send_1xx_h1; 1214 static http_response_send_1xx_cb http_response_send_1xx_h2; 1215 1216 void 1217 http_response_send_1xx_cb_set (http_response_send_1xx_cb fn, int vers) 1218 { 1219 if (vers >= HTTP_VERSION_2) 1220 http_response_send_1xx_h2 = fn; 1221 else if (vers == HTTP_VERSION_1_1) 1222 http_response_send_1xx_h1 = fn; 1223 } 1224 1225 1226 int 1227 http_response_send_1xx (request_st * const r) 1228 { 1229 http_response_send_1xx_cb http_response_send_1xx_fn = NULL; 1230 if (r->http_version >= HTTP_VERSION_2) 1231 http_response_send_1xx_fn = http_response_send_1xx_h2; 1232 else if (r->http_version == HTTP_VERSION_1_1) 1233 http_response_send_1xx_fn = http_response_send_1xx_h1; 1234 1235 if (http_response_send_1xx_fn && !http_response_send_1xx_fn(r, r->con)) 1236 return 0; /* error occurred */ 1237 1238 http_response_header_clear(r); 1239 return 1; /* 1xx response handled */ 1240 } 1241 1242 1243 __attribute_cold__ 1244 __attribute_noinline__ 1245 static int 1246 http_response_check_1xx (request_st * const r, buffer * const restrict b, uint32_t hlen, uint32_t dlen) 1247 { 1248 /* pass through unset r->http_status (not 1xx) or 101 Switching Protocols */ 1249 if (0 == r->http_status || 101 == r->http_status) 1250 return 0; /* pass through as-is; do not loop for addtl response hdrs */ 1251 1252 /* discard 1xx response from b; already processed 1253 * (but further response might follow in b, so preserve addtl data) */ 1254 if (dlen) 1255 memmove(b->ptr, b->ptr+hlen, dlen); 1256 buffer_string_set_length(b, dlen); 1257 1258 /* Note: while GW_AUTHORIZER mode is not expected to return 1xx, as a 1259 * feature, 1xx responses from authorizer are passed back to client */ 1260 1261 return http_response_send_1xx(r); 1262 /* 0: error, 1: 1xx response handled; loop for next response headers */ 1263 } 1264 1265 1266 __attribute_hot__ 1267 __attribute_pure__ 1268 static const char * 1269 http_response_end_of_header (const char * const restrict ptr) 1270 { 1271 /* find \n(\r)?\n sequence */ 1272 for (const char *n=ptr-1, *nn=NULL; NULL != (n = strchr(n+1, '\n')); nn=n) { 1273 if (n - nn == 2 ? n[-1] == '\r' : n - nn == 1) return n+1; 1274 } 1275 return NULL; 1276 } 1277 1278 1279 handler_t http_response_parse_headers(request_st * const r, http_response_opts * const opts, buffer * const b) { 1280 /** 1281 * possible formats of response headers: 1282 * 1283 * proxy or NPH (non-parsed headers): 1284 * 1285 * HTTP/1.0 200 Ok\n 1286 * Header: Value\n 1287 * \n 1288 * 1289 * CGI: 1290 * 1291 * Header: Value\n 1292 * Status: 200\n 1293 * \n 1294 * 1295 * and different mixes of \n and \r\n combinations 1296 * 1297 * Some users also forget about CGI and just send a response 1298 * and hope we handle it. No headers, no header-content separator 1299 */ 1300 const char *bstart; 1301 uint32_t blen; 1302 1303 do { 1304 1305 blen = buffer_string_length(b); 1306 /*("HTTP/1.1 200 " is at least 13 chars + \r\n)*/ 1307 const int is_nph = (blen > 12 && 0 == memcmp(b->ptr, "HTTP/1.", 7)); 1308 1309 int is_header_end = 0; 1310 uint32_t i = 0; 1311 1312 if (b->ptr[0] == '\n' || (b->ptr[0] == '\r' && b->ptr[1] == '\n')) { 1313 /* no HTTP headers */ 1314 i = (b->ptr[0] == '\n') ? 0 : 1; 1315 is_header_end = 1; 1316 } else if (is_nph || b->ptr[(i = strcspn(b->ptr, ":\n"))] == ':') { 1317 /* HTTP headers */ 1318 const char *n = http_response_end_of_header(b->ptr+i+1); 1319 if (n) { 1320 i = (uint32_t)(n - b->ptr - 1); 1321 is_header_end = 1; 1322 } 1323 } else if (i == blen) { /* (no newline yet; partial header line?) */ 1324 } else if (opts->backend == BACKEND_CGI) { 1325 /* no HTTP headers, but a body (special-case for CGI compat) */ 1326 /* no colon found; does not appear to be HTTP headers */ 1327 if (0 != http_chunk_append_buffer(r, b)) { 1328 return HANDLER_ERROR; 1329 } 1330 r->http_status = 200; /* OK */ 1331 r->resp_body_started = 1; 1332 return HANDLER_GO_ON; 1333 } else { 1334 /* invalid response headers */ 1335 r->http_status = 502; /* Bad Gateway */ 1336 r->handler_module = NULL; 1337 return HANDLER_FINISHED; 1338 } 1339 1340 if (!is_header_end) { 1341 if (blen > MAX_HTTP_RESPONSE_FIELD_SIZE) { 1342 log_error(r->conf.errh, __FILE__, __LINE__, 1343 "response headers too large for %s", r->uri.path.ptr); 1344 r->http_status = 502; /* Bad Gateway */ 1345 r->handler_module = NULL; 1346 return HANDLER_FINISHED; 1347 } 1348 return HANDLER_GO_ON; 1349 } 1350 1351 /* the body starts after the EOL */ 1352 bstart = b->ptr + (i + 1); 1353 blen -= (i + 1); 1354 1355 /* strip the last \r?\n */ 1356 if (i > 0 && (b->ptr[i - 1] == '\r')) { 1357 i--; 1358 } 1359 1360 buffer_string_set_length(b, i); 1361 1362 if (opts->backend == BACKEND_PROXY && !is_nph) { 1363 /* invalid response Status-Line from HTTP proxy */ 1364 r->http_status = 502; /* Bad Gateway */ 1365 r->handler_module = NULL; 1366 return HANDLER_FINISHED; 1367 } 1368 1369 if (0 != http_response_process_headers(r, opts, b)) { 1370 return HANDLER_ERROR; 1371 } 1372 1373 } while (r->http_status < 200 1374 && http_response_check_1xx(r, b, bstart - b->ptr, blen)); 1375 1376 r->resp_body_started = 1; 1377 1378 if (opts->authorizer 1379 && (r->http_status == 0 || r->http_status == 200)) { 1380 return HANDLER_GO_ON; 1381 } 1382 1383 if (NULL == r->handler_module) { 1384 return HANDLER_FINISHED; 1385 } 1386 1387 if (opts->local_redir && r->http_status >= 300 && r->http_status < 400){ 1388 /*(light_btst(r->resp_htags, HTTP_HEADER_LOCATION))*/ 1389 handler_t rc = http_response_process_local_redir(r, blen); 1390 if (NULL == r->handler_module) 1391 r->resp_body_started = 0; 1392 if (rc != HANDLER_GO_ON) return rc; 1393 } 1394 1395 if (opts->xsendfile_allow) { 1396 buffer *vb; 1397 /* X-Sendfile2 is deprecated; historical for fastcgi */ 1398 if (opts->backend == BACKEND_FASTCGI 1399 && NULL != (vb = http_header_response_get(r, HTTP_HEADER_OTHER, 1400 CONST_STR_LEN("X-Sendfile2")))) { 1401 http_response_xsendfile2(r, vb, opts->xsendfile_docroot); 1402 /* http_header_response_unset() shortcut for HTTP_HEADER_OTHER */ 1403 buffer_clear(vb); /*(do not send to client)*/ 1404 if (NULL == r->handler_module) 1405 r->resp_body_started = 0; 1406 return HANDLER_FINISHED; 1407 } else if (NULL != (vb = http_header_response_get(r, HTTP_HEADER_OTHER, 1408 CONST_STR_LEN("X-Sendfile"))) 1409 || (opts->backend == BACKEND_FASTCGI /* X-LIGHTTPD-send-file is deprecated; historical for fastcgi */ 1410 && NULL != (vb = http_header_response_get(r, HTTP_HEADER_OTHER, 1411 CONST_STR_LEN("X-LIGHTTPD-send-file"))))) { 1412 http_response_xsendfile(r, vb, opts->xsendfile_docroot); 1413 /* http_header_response_unset() shortcut for HTTP_HEADER_OTHER */ 1414 buffer_clear(vb); /*(do not send to client)*/ 1415 if (NULL == r->handler_module) 1416 r->resp_body_started = 0; 1417 return HANDLER_FINISHED; 1418 } 1419 } 1420 1421 if (blen > 0) { 1422 if (0 != http_chunk_decode_append_mem(r, bstart, blen)) 1423 return HANDLER_ERROR; 1424 } 1425 1426 /* (callback for response headers complete) */ 1427 return (opts->headers) ? opts->headers(r, opts) : HANDLER_GO_ON; 1428 } 1429 1430 1431 handler_t http_response_read(request_st * const r, http_response_opts * const opts, buffer * const b, fdnode * const fdn) { 1432 const int fd = fdn->fd; 1433 while (1) { 1434 ssize_t n; 1435 size_t avail = buffer_string_space(b); 1436 unsigned int toread = 0; 1437 1438 if (0 == fdevent_ioctl_fionread(fd, opts->fdfmt, (int *)&toread)) { 1439 if (avail < toread) { 1440 size_t blen = buffer_string_length(b); 1441 if (toread + blen < 4096) 1442 toread = 4095 - blen; 1443 else if (toread > MAX_READ_LIMIT) 1444 toread = MAX_READ_LIMIT; 1445 } 1446 else if (0 == toread) { 1447 #if 0 1448 return (fdevent_fdnode_interest(fdn) & FDEVENT_IN) 1449 ? HANDLER_FINISHED /* read finished */ 1450 : HANDLER_GO_ON; /* optimistic read; data not ready */ 1451 #else 1452 if (!(fdevent_fdnode_interest(fdn) & FDEVENT_IN)) { 1453 if (!(r->conf.stream_response_body 1454 & FDEVENT_STREAM_RESPONSE_POLLRDHUP)) 1455 return HANDLER_GO_ON;/*optimistic read; data not ready*/ 1456 } 1457 if (0 == avail) /* let read() below indicate if EOF or EAGAIN */ 1458 toread = 1024; 1459 #endif 1460 } 1461 } 1462 else if (avail < 1024) { 1463 toread = 4095 - avail; 1464 } 1465 1466 if (r->conf.stream_response_body & FDEVENT_STREAM_RESPONSE_BUFMIN) { 1467 off_t cqlen = chunkqueue_length(&r->write_queue); 1468 if (cqlen + (off_t)toread > 65536 - 4096) { 1469 if (!r->con->is_writable) { 1470 /*(defer removal of FDEVENT_IN interest since 1471 * connection_state_machine() might be able to send data 1472 * immediately, unless !con->is_writable, where 1473 * connection_state_machine() might not loop back to call 1474 * mod_proxy_handle_subrequest())*/ 1475 fdevent_fdnode_event_clr(r->con->srv->ev, fdn, FDEVENT_IN); 1476 } 1477 if (cqlen >= 65536-1) return HANDLER_GO_ON; 1478 toread = 65536 - 1 - (unsigned int)cqlen; 1479 /* Note: heuristic is fuzzy in that it limits how much to read 1480 * from backend based on how much is pending to write to client. 1481 * Modules where data from backend is framed (e.g. FastCGI) may 1482 * want to limit how much is buffered from backend while waiting 1483 * for a complete data frame or data packet from backend. */ 1484 } 1485 } 1486 1487 if (avail < toread) { 1488 /*(add avail+toread to reduce allocations when ioctl EOPNOTSUPP)*/ 1489 avail = avail ? avail - 1 + toread : toread; 1490 buffer_string_prepare_append(b, avail); 1491 } 1492 1493 n = read(fd, b->ptr+buffer_string_length(b), avail); 1494 1495 if (n < 0) { 1496 switch (errno) { 1497 case EAGAIN: 1498 #ifdef EWOULDBLOCK 1499 #if EWOULDBLOCK != EAGAIN 1500 case EWOULDBLOCK: 1501 #endif 1502 #endif 1503 case EINTR: 1504 return HANDLER_GO_ON; 1505 default: 1506 log_perror(r->conf.errh, __FILE__, __LINE__, 1507 "read() %d %d", r->con->fd, fd); 1508 return HANDLER_ERROR; 1509 } 1510 } 1511 1512 buffer_commit(b, (size_t)n); 1513 #ifdef __COVERITY__ 1514 /* Coverity Scan overlooks the effect of buffer_commit() */ 1515 b->ptr[buffer_string_length(b)+n] = '\0'; 1516 #endif 1517 1518 if (NULL != opts->parse) { 1519 handler_t rc = opts->parse(r, opts, b, (size_t)n); 1520 if (rc != HANDLER_GO_ON) return rc; 1521 } else if (0 == n) { 1522 /* note: no further data is sent to backend after read EOF on socket 1523 * (not checking for half-closed TCP socket) 1524 * (backend should read all data desired prior to closing socket, 1525 * though might send app-level close data frame, if applicable) */ 1526 return HANDLER_FINISHED; /* read finished */ 1527 } else if (0 == r->resp_body_started) { 1528 /* split header from body */ 1529 handler_t rc = http_response_parse_headers(r, opts, b); 1530 if (rc != HANDLER_GO_ON) return rc; 1531 /* accumulate response in b until headers completed (or error) */ 1532 if (r->resp_body_started) buffer_clear(b); 1533 } else { 1534 if (0 != http_chunk_decode_append_buffer(r, b)) { 1535 /* error writing to tempfile; 1536 * truncate response or send 500 if nothing sent yet */ 1537 return HANDLER_ERROR; 1538 } 1539 buffer_clear(b); 1540 } 1541 1542 if (r->conf.stream_response_body & FDEVENT_STREAM_RESPONSE_BUFMIN) { 1543 if (chunkqueue_length(&r->write_queue) > 65536 - 4096) { 1544 /*(defer removal of FDEVENT_IN interest since 1545 * connection_state_machine() might be able to send 1546 * data immediately, unless !con->is_writable, where 1547 * connection_state_machine() might not loop back to 1548 * call the subrequest handler)*/ 1549 if (!r->con->is_writable) 1550 fdevent_fdnode_event_clr(r->con->srv->ev, fdn, FDEVENT_IN); 1551 break; 1552 } 1553 } 1554 1555 if ((size_t)n < avail) 1556 break; /* emptied kernel read buffer or partial read */ 1557 } 1558 1559 return HANDLER_GO_ON; 1560 } 1561 1562 1563 int http_cgi_headers (request_st * const r, http_cgi_opts * const opts, http_cgi_header_append_cb cb, void *vdata) { 1564 1565 /* CGI-SPEC 6.1.2, FastCGI spec 6.3 and SCGI spec */ 1566 1567 int rc = 0; 1568 const connection * const con = r->con; 1569 server_socket * const srv_sock = con->srv_socket; 1570 buffer * const tb = r->tmp_buf; 1571 const char *s; 1572 size_t n; 1573 char buf[LI_ITOSTRING_LENGTH]; 1574 sock_addr *addr; 1575 sock_addr addrbuf; 1576 char b2[INET6_ADDRSTRLEN + 1]; 1577 1578 /* (CONTENT_LENGTH must be first for SCGI) */ 1579 if (!opts->authorizer) { 1580 rc |= cb(vdata, CONST_STR_LEN("CONTENT_LENGTH"), 1581 buf, li_itostrn(buf,sizeof(buf),r->reqbody_length)); 1582 } 1583 1584 if (!buffer_string_is_empty(&r->uri.query)) { 1585 rc |= cb(vdata, CONST_STR_LEN("QUERY_STRING"), 1586 CONST_BUF_LEN(&r->uri.query)); 1587 } else { 1588 rc |= cb(vdata, CONST_STR_LEN("QUERY_STRING"), 1589 CONST_STR_LEN("")); 1590 } 1591 if (!buffer_string_is_empty(opts->strip_request_uri)) { 1592 /** 1593 * /app1/index/list 1594 * 1595 * stripping /app1 or /app1/ should lead to 1596 * 1597 * /index/list 1598 * 1599 */ 1600 size_t len = buffer_string_length(opts->strip_request_uri); 1601 if ('/' == opts->strip_request_uri->ptr[len-1]) { 1602 --len; 1603 } 1604 1605 if (buffer_string_length(&r->target_orig) >= len 1606 && 0 == memcmp(r->target_orig.ptr, 1607 opts->strip_request_uri->ptr, len) 1608 && r->target_orig.ptr[len] == '/') { 1609 rc |= cb(vdata, CONST_STR_LEN("REQUEST_URI"), 1610 r->target_orig.ptr+len, 1611 buffer_string_length(&r->target_orig)-len); 1612 } else { 1613 rc |= cb(vdata, CONST_STR_LEN("REQUEST_URI"), 1614 CONST_BUF_LEN(&r->target_orig)); 1615 } 1616 } else { 1617 rc |= cb(vdata, CONST_STR_LEN("REQUEST_URI"), 1618 CONST_BUF_LEN(&r->target_orig)); 1619 } 1620 if (!buffer_is_equal(&r->target, &r->target_orig)) { 1621 rc |= cb(vdata, CONST_STR_LEN("REDIRECT_URI"), 1622 CONST_BUF_LEN(&r->target)); 1623 } 1624 /* set REDIRECT_STATUS for php compiled with --force-redirect 1625 * (if REDIRECT_STATUS has not already been set by error handler) */ 1626 if (0 == r->error_handler_saved_status) { 1627 rc |= cb(vdata, CONST_STR_LEN("REDIRECT_STATUS"), 1628 CONST_STR_LEN("200")); 1629 } 1630 1631 /* 1632 * SCRIPT_NAME, PATH_INFO and PATH_TRANSLATED according to 1633 * http://cgi-spec.golux.com/draft-coar-cgi-v11-03-clean.html 1634 * (6.1.14, 6.1.6, 6.1.7) 1635 */ 1636 if (!opts->authorizer) { 1637 rc |= cb(vdata, CONST_STR_LEN("SCRIPT_NAME"), 1638 CONST_BUF_LEN(&r->uri.path)); 1639 if (!buffer_string_is_empty(&r->pathinfo)) { 1640 rc |= cb(vdata, CONST_STR_LEN("PATH_INFO"), 1641 CONST_BUF_LEN(&r->pathinfo)); 1642 /* PATH_TRANSLATED is only defined if PATH_INFO is set */ 1643 if (!buffer_string_is_empty(opts->docroot)) { 1644 buffer_copy_buffer(tb, opts->docroot); 1645 } else { 1646 buffer_copy_buffer(tb, &r->physical.basedir); 1647 } 1648 buffer_append_string_buffer(tb, &r->pathinfo); 1649 rc |= cb(vdata, CONST_STR_LEN("PATH_TRANSLATED"), 1650 CONST_BUF_LEN(tb)); 1651 } 1652 } 1653 1654 /* 1655 * SCRIPT_FILENAME and DOCUMENT_ROOT for php 1656 * The PHP manual http://www.php.net/manual/en/reserved.variables.php 1657 * treatment of PATH_TRANSLATED is different from the one of CGI specs. 1658 * (see php.ini cgi.fix_pathinfo = 1 config parameter) 1659 */ 1660 1661 if (!buffer_string_is_empty(opts->docroot)) { 1662 /* alternate docroot, e.g. for remote FastCGI or SCGI server */ 1663 buffer_copy_buffer(tb, opts->docroot); 1664 buffer_append_string_buffer(tb, &r->uri.path); 1665 rc |= cb(vdata, CONST_STR_LEN("SCRIPT_FILENAME"), 1666 CONST_BUF_LEN(tb)); 1667 rc |= cb(vdata, CONST_STR_LEN("DOCUMENT_ROOT"), 1668 CONST_BUF_LEN(opts->docroot)); 1669 } else { 1670 if (opts->break_scriptfilename_for_php) { 1671 /* php.ini config cgi.fix_pathinfo = 1 need a broken SCRIPT_FILENAME 1672 * to find out what PATH_INFO is itself 1673 * 1674 * see src/sapi/cgi_main.c, init_request_info() 1675 */ 1676 buffer_copy_buffer(tb, &r->physical.path); 1677 buffer_append_string_buffer(tb, &r->pathinfo); 1678 rc |= cb(vdata, CONST_STR_LEN("SCRIPT_FILENAME"), 1679 CONST_BUF_LEN(tb)); 1680 } else { 1681 rc |= cb(vdata, CONST_STR_LEN("SCRIPT_FILENAME"), 1682 CONST_BUF_LEN(&r->physical.path)); 1683 } 1684 rc |= cb(vdata, CONST_STR_LEN("DOCUMENT_ROOT"), 1685 CONST_BUF_LEN(&r->physical.basedir)); 1686 } 1687 1688 s = get_http_method_name(r->http_method); 1689 force_assert(s); 1690 rc |= cb(vdata, CONST_STR_LEN("REQUEST_METHOD"), s, strlen(s)); 1691 1692 s = get_http_version_name(r->http_version); 1693 force_assert(s); 1694 rc |= cb(vdata, CONST_STR_LEN("SERVER_PROTOCOL"), s, strlen(s)); 1695 1696 rc |= cb(vdata, CONST_STR_LEN("SERVER_SOFTWARE"), 1697 CONST_BUF_LEN(r->conf.server_tag)); 1698 1699 rc |= cb(vdata, CONST_STR_LEN("GATEWAY_INTERFACE"), 1700 CONST_STR_LEN("CGI/1.1")); 1701 1702 rc |= cb(vdata, CONST_STR_LEN("REQUEST_SCHEME"), 1703 CONST_BUF_LEN(&r->uri.scheme)); 1704 1705 if (buffer_is_equal_string(&r->uri.scheme, CONST_STR_LEN("https"))) { 1706 rc |= cb(vdata, CONST_STR_LEN("HTTPS"), CONST_STR_LEN("on")); 1707 } 1708 1709 addr = &srv_sock->addr; 1710 rc |= cb(vdata, CONST_STR_LEN("SERVER_PORT"), 1711 buf, li_utostrn(buf,sizeof(buf),sock_addr_get_port(addr))); 1712 1713 switch (sock_addr_get_family(addr)) { 1714 case AF_INET: 1715 case AF_INET6: 1716 if (sock_addr_is_addr_wildcard(addr)) { 1717 socklen_t addrlen = sizeof(addrbuf); 1718 if (0 == getsockname(con->fd,(struct sockaddr *)&addrbuf,&addrlen)){ 1719 addr = &addrbuf; 1720 } else { 1721 s = ""; 1722 break; 1723 } 1724 } 1725 s = sock_addr_inet_ntop(addr, b2, sizeof(b2)-1); 1726 if (NULL == s) s = ""; 1727 break; 1728 default: 1729 s = ""; 1730 break; 1731 } 1732 force_assert(s); 1733 rc |= cb(vdata, CONST_STR_LEN("SERVER_ADDR"), s, strlen(s)); 1734 1735 if (!buffer_string_is_empty(r->server_name)) { 1736 size_t len = buffer_string_length(r->server_name); 1737 1738 if (r->server_name->ptr[0] == '[') { 1739 const char *colon = strstr(r->server_name->ptr, "]:"); 1740 if (colon) len = (colon + 1) - r->server_name->ptr; 1741 } else { 1742 const char *colon = strchr(r->server_name->ptr, ':'); 1743 if (colon) len = colon - r->server_name->ptr; 1744 } 1745 1746 rc |= cb(vdata, CONST_STR_LEN("SERVER_NAME"), 1747 r->server_name->ptr, len); 1748 } else { 1749 /* set to be same as SERVER_ADDR (above) */ 1750 rc |= cb(vdata, CONST_STR_LEN("SERVER_NAME"), s, strlen(s)); 1751 } 1752 1753 rc |= cb(vdata, CONST_STR_LEN("REMOTE_ADDR"), 1754 CONST_BUF_LEN(con->dst_addr_buf)); 1755 1756 rc |= cb(vdata, CONST_STR_LEN("REMOTE_PORT"), buf, 1757 li_utostrn(buf,sizeof(buf),sock_addr_get_port(&con->dst_addr))); 1758 1759 for (n = 0; n < r->rqst_headers.used; n++) { 1760 data_string *ds = (data_string *)r->rqst_headers.data[n]; 1761 if (!buffer_string_is_empty(&ds->value) && !buffer_is_empty(&ds->key)) { 1762 /* Security: Do not emit HTTP_PROXY in environment. 1763 * Some executables use HTTP_PROXY to configure 1764 * outgoing proxy. See also https://httpoxy.org/ */ 1765 if (buffer_is_equal_caseless_string(&ds->key, 1766 CONST_STR_LEN("Proxy"))) { 1767 continue; 1768 } 1769 buffer_copy_string_encoded_cgi_varnames(tb, 1770 CONST_BUF_LEN(&ds->key), 1); 1771 rc |= cb(vdata, CONST_BUF_LEN(tb), 1772 CONST_BUF_LEN(&ds->value)); 1773 } 1774 } 1775 1776 con->srv->request_env(r); 1777 1778 for (n = 0; n < r->env.used; n++) { 1779 data_string *ds = (data_string *)r->env.data[n]; 1780 if (!buffer_is_empty(&ds->value) && !buffer_is_empty(&ds->key)) { 1781 buffer_copy_string_encoded_cgi_varnames(tb, 1782 CONST_BUF_LEN(&ds->key), 0); 1783 rc |= cb(vdata, CONST_BUF_LEN(tb), 1784 CONST_BUF_LEN(&ds->value)); 1785 } 1786 } 1787 1788 return rc; 1789 } 1790