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 static int http_response_buffer_append_authority(request_st * const r, buffer * const o) { 34 if (!buffer_string_is_empty(&r->uri.authority)) { 35 buffer_append_string_buffer(o, &r->uri.authority); 36 } else { 37 /* get the name of the currently connected socket */ 38 sock_addr our_addr; 39 socklen_t our_addr_len; 40 41 our_addr.plain.sa_family = 0; 42 our_addr_len = sizeof(our_addr); 43 44 if (-1 == getsockname(r->con->fd, (struct sockaddr *)&our_addr, &our_addr_len) 45 || our_addr_len > (socklen_t)sizeof(our_addr)) { 46 r->http_status = 500; 47 log_perror(r->conf.errh, __FILE__, __LINE__, "can't get sockname"); 48 return -1; 49 } 50 51 if (our_addr.plain.sa_family == AF_INET 52 && our_addr.ipv4.sin_addr.s_addr == htonl(INADDR_LOOPBACK)) { 53 static char lhost[32]; 54 static size_t lhost_len = 0; 55 if (0 != lhost_len) { 56 buffer_append_string_len(o, lhost, lhost_len); 57 } 58 else { 59 size_t olen = buffer_string_length(o); 60 if (0 == sock_addr_nameinfo_append_buffer(o, &our_addr, r->conf.errh)) { 61 lhost_len = buffer_string_length(o) - olen; 62 if (lhost_len < sizeof(lhost)) { 63 memcpy(lhost, o->ptr+olen, lhost_len+1); /*(+1 for '\0')*/ 64 } 65 else { 66 lhost_len = 0; 67 } 68 } 69 else { 70 lhost_len = sizeof("localhost")-1; 71 memcpy(lhost, "localhost", lhost_len+1); /*(+1 for '\0')*/ 72 buffer_append_string_len(o, lhost, lhost_len); 73 } 74 } 75 } else if (!buffer_string_is_empty(r->server_name)) { 76 buffer_append_string_buffer(o, r->server_name); 77 } else 78 /* Lookup name: secondly try to get hostname for bind address */ 79 if (0 != sock_addr_nameinfo_append_buffer(o, &our_addr, r->conf.errh)) { 80 r->http_status = 500; 81 return -1; 82 } 83 84 { 85 unsigned short listen_port = sock_addr_get_port(&our_addr); 86 unsigned short default_port = 80; 87 if (buffer_is_equal_string(&r->uri.scheme, CONST_STR_LEN("https"))) { 88 default_port = 443; 89 } 90 if (0 == listen_port) listen_port = r->con->srv->srvconf.port; 91 if (default_port != listen_port) { 92 buffer_append_string_len(o, CONST_STR_LEN(":")); 93 buffer_append_int(o, listen_port); 94 } 95 } 96 } 97 return 0; 98 } 99 100 int http_response_redirect_to_directory(request_st * const r, int status) { 101 buffer *o = r->tmp_buf; 102 buffer_copy_buffer(o, &r->uri.scheme); 103 buffer_append_string_len(o, CONST_STR_LEN("://")); 104 if (0 != http_response_buffer_append_authority(r, o)) { 105 return -1; 106 } 107 buffer_append_string_encoded(o, CONST_BUF_LEN(&r->uri.path), ENCODING_REL_URI); 108 buffer_append_string_len(o, CONST_STR_LEN("/")); 109 if (!buffer_string_is_empty(&r->uri.query)) { 110 buffer_append_string_len(o, CONST_STR_LEN("?")); 111 buffer_append_string_buffer(o, &r->uri.query); 112 } 113 114 if (status >= 300) { 115 http_header_response_set(r, HTTP_HEADER_LOCATION, CONST_STR_LEN("Location"), CONST_BUF_LEN(o)); 116 r->http_status = status; 117 r->resp_body_finished = 1; 118 } 119 else { 120 http_header_response_set(r, HTTP_HEADER_CONTENT_LOCATION, CONST_STR_LEN("Content-Location"), CONST_BUF_LEN(o)); 121 } 122 123 return 0; 124 } 125 126 #define MTIME_CACHE_MAX 16 127 struct mtime_cache_type { 128 time_t mtime; /* key */ 129 buffer str; /* buffer for string representation */ 130 }; 131 static struct mtime_cache_type mtime_cache[MTIME_CACHE_MAX]; 132 static char mtime_cache_str[MTIME_CACHE_MAX][30]; 133 /* 30-chars for "%a, %d %b %Y %H:%M:%S GMT" */ 134 135 void strftime_cache_reset(void) { 136 for (int i = 0; i < MTIME_CACHE_MAX; ++i) { 137 mtime_cache[i].mtime = (time_t)-1; 138 mtime_cache[i].str.ptr = mtime_cache_str[i]; 139 mtime_cache[i].str.used = sizeof(mtime_cache_str[0]); 140 mtime_cache[i].str.size = sizeof(mtime_cache_str[0]); 141 } 142 } 143 144 const buffer * strftime_cache_get(const time_t last_mod) { 145 static int mtime_cache_idx; 146 147 for (int j = 0; j < MTIME_CACHE_MAX; ++j) { 148 if (mtime_cache[j].mtime == last_mod) 149 return &mtime_cache[j].str; /* found cache-entry */ 150 } 151 152 if (++mtime_cache_idx == MTIME_CACHE_MAX) mtime_cache_idx = 0; 153 154 const int i = mtime_cache_idx; 155 mtime_cache[i].mtime = last_mod; 156 strftime(mtime_cache[i].str.ptr, sizeof(mtime_cache_str[0]), 157 "%a, %d %b %Y %H:%M:%S GMT", gmtime(&mtime_cache[i].mtime)); 158 159 return &mtime_cache[i].str; 160 } 161 162 163 int http_response_handle_cachable(request_st * const r, const buffer * const mtime) { 164 const buffer *vb; 165 166 /* 167 * 14.26 If-None-Match 168 * [...] 169 * If none of the entity tags match, then the server MAY perform the 170 * requested method as if the If-None-Match header field did not exist, 171 * but MUST also ignore any If-Modified-Since header field(s) in the 172 * request. That is, if no entity tags match, then the server MUST NOT 173 * return a 304 (Not Modified) response. 174 */ 175 176 if ((vb = http_header_request_get(r, HTTP_HEADER_IF_NONE_MATCH, CONST_STR_LEN("If-None-Match")))) { 177 /*(weak etag comparison must not be used for ranged requests)*/ 178 int range_request = 179 (r->conf.range_requests 180 && (200 == r->http_status || 0 == r->http_status) 181 && NULL != http_header_request_get(r, HTTP_HEADER_RANGE, CONST_STR_LEN("Range"))); 182 if (etag_is_equal(&r->physical.etag, vb->ptr, !range_request)) { 183 if (http_method_get_or_head(r->http_method)) { 184 r->http_status = 304; 185 return HANDLER_FINISHED; 186 } else { 187 r->http_status = 412; 188 r->handler_module = NULL; 189 return HANDLER_FINISHED; 190 } 191 } 192 } else if (http_method_get_or_head(r->http_method) 193 && (vb = http_header_request_get(r, HTTP_HEADER_IF_MODIFIED_SINCE, CONST_STR_LEN("If-Modified-Since")))) { 194 /* last-modified handling */ 195 size_t used_len; 196 char *semicolon; 197 198 if (NULL == (semicolon = strchr(vb->ptr, ';'))) { 199 used_len = buffer_string_length(vb); 200 } else { 201 used_len = semicolon - vb->ptr; 202 } 203 204 if (buffer_is_equal_string(mtime, vb->ptr, used_len)) { 205 if ('\0' == mtime->ptr[used_len]) r->http_status = 304; 206 return HANDLER_FINISHED; 207 } else { 208 char buf[sizeof("Sat, 23 Jul 2005 21:20:01 GMT")]; 209 time_t t_header, t_file; 210 struct tm tm; 211 212 /* convert to timestamp */ 213 if (used_len >= sizeof(buf)) return HANDLER_GO_ON; 214 215 memcpy(buf, vb->ptr, used_len); 216 buf[used_len] = '\0'; 217 218 if (NULL == strptime(buf, "%a, %d %b %Y %H:%M:%S GMT", &tm)) { 219 /** 220 * parsing failed, let's get out of here 221 */ 222 return HANDLER_GO_ON; 223 } 224 tm.tm_isdst = 0; 225 t_header = mktime(&tm); 226 227 strptime(mtime->ptr, "%a, %d %b %Y %H:%M:%S GMT", &tm); 228 tm.tm_isdst = 0; 229 t_file = mktime(&tm); 230 231 if (t_file > t_header) return HANDLER_GO_ON; 232 233 r->http_status = 304; 234 return HANDLER_FINISHED; 235 } 236 } 237 238 return HANDLER_GO_ON; 239 } 240 241 242 void http_response_body_clear (request_st * const r, int preserve_length) { 243 r->resp_send_chunked = 0; 244 if (r->resp_htags & HTTP_HEADER_TRANSFER_ENCODING) { 245 http_header_response_unset(r, HTTP_HEADER_TRANSFER_ENCODING, CONST_STR_LEN("Transfer-Encoding")); 246 } 247 if (!preserve_length) { /* preserve for HEAD responses and no-content responses (204, 205, 304) */ 248 r->content_length = -1; 249 if (r->resp_htags & HTTP_HEADER_CONTENT_LENGTH) { 250 http_header_response_unset(r, HTTP_HEADER_CONTENT_LENGTH, CONST_STR_LEN("Content-Length")); 251 } 252 /*(if not preserving Content-Length, do not preserve trailers, if any)*/ 253 r->resp_decode_chunked = 0; 254 if (r->gw_dechunk) { 255 free(r->gw_dechunk->b.ptr); 256 free(r->gw_dechunk); 257 r->gw_dechunk = NULL; 258 } 259 } 260 chunkqueue_reset(r->write_queue); 261 } 262 263 264 void http_response_reset (request_st * const r) { 265 r->http_status = 0; 266 r->con->is_writable = 1; 267 r->resp_body_finished = 0; 268 r->resp_body_started = 0; 269 r->handler_module = NULL; 270 if (r->physical.path.ptr) { /*(skip for mod_fastcgi authorizer)*/ 271 buffer_clear(&r->physical.doc_root); 272 buffer_clear(&r->physical.basedir); 273 buffer_clear(&r->physical.etag); 274 buffer_reset(&r->physical.path); 275 buffer_reset(&r->physical.rel_path); 276 } 277 r->resp_htags = 0; 278 array_reset_data_strings(&r->resp_headers); 279 http_response_body_clear(r, 0); 280 } 281 282 283 handler_t http_response_reqbody_read_error (request_st * const r, int http_status) { 284 r->keep_alive = 0; 285 286 /*(do not change status if response headers already set and possibly sent)*/ 287 if (0 != r->resp_header_len) return HANDLER_ERROR; 288 289 http_response_body_clear(r, 0); 290 r->http_status = http_status; 291 r->handler_module = NULL; 292 return HANDLER_FINISHED; 293 } 294 295 296 static int http_response_parse_range(request_st * const r, buffer * const path, stat_cache_entry * const sce, const char * const range) { 297 int multipart = 0; 298 int error; 299 off_t start, end; 300 const char *s, *minus; 301 static const char boundary[] = "fkj49sn38dcn3"; 302 const buffer *content_type = http_header_response_get(r, HTTP_HEADER_CONTENT_TYPE, CONST_STR_LEN("Content-Type")); 303 304 start = 0; 305 end = sce->st.st_size - 1; 306 307 r->content_length = 0; 308 309 for (s = range, error = 0; 310 !error && *s && NULL != (minus = strchr(s, '-')); ) { 311 char *err; 312 off_t la = 0, le; 313 *((const char **)&err) = s; /*(quiet clang --analyze)*/ 314 315 if (s != minus) { 316 la = strtoll(s, &err, 10); 317 if (err != minus) { 318 /* should not have multiple range-unit in Range, but 319 * handle just in case multiple Range headers merged */ 320 while (*s == ' ' || *s == '\t') ++s; 321 if (0 != strncmp(s, "bytes=", 6)) return -1; 322 s += 6; 323 if (s != minus) { 324 la = strtoll(s, &err, 10); 325 if (err != minus) return -1; 326 } 327 } 328 } 329 330 if (s == minus) { 331 /* -<stop> */ 332 333 le = strtoll(s, &err, 10); 334 335 if (le == 0) { 336 /* RFC 2616 - 14.35.1 */ 337 338 r->http_status = 416; 339 error = 1; 340 } else if (*err == '\0') { 341 /* end */ 342 s = err; 343 344 end = sce->st.st_size - 1; 345 start = sce->st.st_size + le; 346 } else if (*err == ',') { 347 multipart = 1; 348 s = err + 1; 349 350 end = sce->st.st_size - 1; 351 start = sce->st.st_size + le; 352 } else { 353 error = 1; 354 } 355 356 } else if (*(minus+1) == '\0' || *(minus+1) == ',') { 357 /* <start>- */ 358 359 /* ok */ 360 361 if (*(err + 1) == '\0') { 362 s = err + 1; 363 364 end = sce->st.st_size - 1; 365 start = la; 366 367 } else if (*(err + 1) == ',') { 368 multipart = 1; 369 s = err + 2; 370 371 end = sce->st.st_size - 1; 372 start = la; 373 } else { 374 error = 1; 375 } 376 } else { 377 /* <start>-<stop> */ 378 379 le = strtoll(minus+1, &err, 10); 380 381 /* RFC 2616 - 14.35.1 */ 382 if (la > le) { 383 error = 1; 384 } 385 386 if (*err == '\0') { 387 /* ok, end*/ 388 s = err; 389 390 end = le; 391 start = la; 392 } else if (*err == ',') { 393 multipart = 1; 394 s = err + 1; 395 396 end = le; 397 start = la; 398 } else { 399 /* error */ 400 401 error = 1; 402 } 403 } 404 405 if (!error) { 406 if (start < 0) start = 0; 407 408 /* RFC 2616 - 14.35.1 */ 409 if (end > sce->st.st_size - 1) end = sce->st.st_size - 1; 410 411 if (start > sce->st.st_size - 1) { 412 error = 1; 413 414 r->http_status = 416; 415 } 416 } 417 418 if (!error) { 419 if (multipart) { 420 /* write boundary-header */ 421 buffer *b = r->tmp_buf; 422 buffer_copy_string_len(b, CONST_STR_LEN("\r\n--")); 423 buffer_append_string_len(b, boundary, sizeof(boundary)-1); 424 425 /* write Content-Range */ 426 buffer_append_string_len(b, CONST_STR_LEN("\r\nContent-Range: bytes ")); 427 buffer_append_int(b, start); 428 buffer_append_string_len(b, CONST_STR_LEN("-")); 429 buffer_append_int(b, end); 430 buffer_append_string_len(b, CONST_STR_LEN("/")); 431 buffer_append_int(b, sce->st.st_size); 432 433 if (content_type) { 434 buffer_append_string_len(b, CONST_STR_LEN("\r\nContent-Type: ")); 435 buffer_append_string_buffer(b, content_type); 436 } 437 438 /* write END-OF-HEADER */ 439 buffer_append_string_len(b, CONST_STR_LEN("\r\n\r\n")); 440 441 r->content_length += buffer_string_length(b); 442 chunkqueue_append_mem(r->write_queue, CONST_BUF_LEN(b)); 443 } 444 445 chunkqueue_append_file(r->write_queue, path, start, end - start + 1); 446 r->content_length += end - start + 1; 447 } 448 } 449 450 /* something went wrong */ 451 if (error) return -1; 452 453 buffer * const tb = r->tmp_buf; 454 455 if (multipart) { 456 /* add boundary end */ 457 buffer_copy_string_len(tb, "\r\n--", 4); 458 buffer_append_string_len(tb, boundary, sizeof(boundary)-1); 459 buffer_append_string_len(tb, "--\r\n", 4); 460 461 r->content_length += buffer_string_length(tb); 462 chunkqueue_append_mem(r->write_queue, CONST_BUF_LEN(tb)); 463 464 /* set header-fields */ 465 466 buffer_copy_string_len(tb, CONST_STR_LEN("multipart/byteranges; boundary=")); 467 buffer_append_string_len(tb, boundary, sizeof(boundary)-1); 468 469 /* overwrite content-type */ 470 http_header_response_set(r, HTTP_HEADER_CONTENT_TYPE, CONST_STR_LEN("Content-Type"), CONST_BUF_LEN(tb)); 471 } else { 472 /* add Content-Range-header */ 473 474 buffer_copy_string_len(tb, CONST_STR_LEN("bytes ")); 475 buffer_append_int(tb, start); 476 buffer_append_string_len(tb, CONST_STR_LEN("-")); 477 buffer_append_int(tb, end); 478 buffer_append_string_len(tb, CONST_STR_LEN("/")); 479 buffer_append_int(tb, sce->st.st_size); 480 481 http_header_response_set(r, HTTP_HEADER_OTHER, CONST_STR_LEN("Content-Range"), CONST_BUF_LEN(tb)); 482 } 483 484 /* ok, the file is set-up */ 485 return 0; 486 } 487 488 489 void http_response_send_file (request_st * const r, buffer * const path) { 490 stat_cache_entry * const sce = stat_cache_get_entry(path); 491 const buffer *mtime = NULL; 492 const buffer *vb; 493 int allow_caching = (0 == r->http_status || 200 == r->http_status); 494 495 if (NULL == sce) { 496 r->http_status = (errno == ENOENT) ? 404 : 403; 497 log_error(r->conf.errh, __FILE__, __LINE__, 498 "not a regular file: %s -> %s", r->uri.path.ptr, path->ptr); 499 return; 500 } 501 502 if (!r->conf.follow_symlink 503 && 0 != stat_cache_path_contains_symlink(path, r->conf.errh)) { 504 r->http_status = 403; 505 if (r->conf.log_request_handling) { 506 log_error(r->conf.errh, __FILE__, __LINE__, 507 "-- access denied due symlink restriction"); 508 log_error(r->conf.errh, __FILE__, __LINE__, 509 "Path : %s", path->ptr); 510 } 511 return; 512 } 513 514 /* we only handle regular files */ 515 if (!S_ISREG(sce->st.st_mode)) { 516 r->http_status = 403; 517 if (r->conf.log_file_not_found) { 518 log_error(r->conf.errh, __FILE__, __LINE__, 519 "not a regular file: %s -> %s", 520 r->uri.path.ptr, path->ptr); 521 } 522 return; 523 } 524 525 /*(Note: O_NOFOLLOW affects only the final path segment, 526 * the target file, not any intermediate symlinks along path)*/ 527 const int fd = (0 != sce->st.st_size) 528 ? fdevent_open_cloexec(path->ptr, r->conf.follow_symlink, O_RDONLY, 0) 529 : -1; 530 if (fd < 0 && 0 != sce->st.st_size) { 531 r->http_status = (errno == ENOENT) ? 404 : 403; 532 if (r->conf.log_request_handling) { 533 log_perror(r->conf.errh, __FILE__, __LINE__, 534 "file open failed: %s", path->ptr); 535 } 536 return; 537 } 538 539 /* set response content-type, if not set already */ 540 541 if (NULL == http_header_response_get(r, HTTP_HEADER_CONTENT_TYPE, CONST_STR_LEN("Content-Type"))) { 542 const buffer *content_type = stat_cache_content_type_get(sce, r); 543 if (buffer_string_is_empty(content_type)) { 544 /* we are setting application/octet-stream, but also announce that 545 * this header field might change in the seconds few requests 546 * 547 * This should fix the aggressive caching of FF and the script download 548 * seen by the first installations 549 */ 550 http_header_response_set(r, HTTP_HEADER_CONTENT_TYPE, CONST_STR_LEN("Content-Type"), CONST_STR_LEN("application/octet-stream")); 551 552 allow_caching = 0; 553 } else { 554 http_header_response_set(r, HTTP_HEADER_CONTENT_TYPE, CONST_STR_LEN("Content-Type"), CONST_BUF_LEN(content_type)); 555 } 556 } 557 558 if (r->conf.range_requests) { 559 http_header_response_append(r, HTTP_HEADER_OTHER, CONST_STR_LEN("Accept-Ranges"), CONST_STR_LEN("bytes")); 560 } 561 562 if (allow_caching) { 563 const buffer *etag = (0 != r->conf.etag_flags) 564 ? stat_cache_etag_get(sce, r->conf.etag_flags) 565 : NULL; 566 if (!buffer_string_is_empty(etag)) { 567 if (NULL == http_header_response_get(r, HTTP_HEADER_ETAG, CONST_STR_LEN("ETag"))) { 568 /* generate e-tag */ 569 etag_mutate(&r->physical.etag, etag); 570 571 http_header_response_set(r, HTTP_HEADER_ETAG, CONST_STR_LEN("ETag"), CONST_BUF_LEN(&r->physical.etag)); 572 } 573 } 574 575 /* prepare header */ 576 if (NULL == (mtime = http_header_response_get(r, HTTP_HEADER_LAST_MODIFIED, CONST_STR_LEN("Last-Modified")))) { 577 mtime = strftime_cache_get(sce->st.st_mtime); 578 http_header_response_set(r, HTTP_HEADER_LAST_MODIFIED, CONST_STR_LEN("Last-Modified"), CONST_BUF_LEN(mtime)); 579 } 580 581 if (HANDLER_FINISHED == http_response_handle_cachable(r, mtime)) { 582 if (fd >= 0) close(fd); 583 return; 584 } 585 } 586 587 if (fd < 0) { /* 0-length file */ 588 r->http_status = 200; 589 r->resp_body_finished = 1; 590 return; 591 } 592 593 if (r->conf.range_requests 594 && (200 == r->http_status || 0 == r->http_status) 595 && NULL != (vb = http_header_request_get(r, HTTP_HEADER_RANGE, CONST_STR_LEN("Range"))) 596 && NULL == http_header_response_get(r, HTTP_HEADER_CONTENT_ENCODING, CONST_STR_LEN("Content-Encoding"))) { 597 const buffer *range = vb; 598 int do_range_request = 1; 599 /* check if we have a conditional GET */ 600 601 if (NULL != (vb = http_header_request_get(r, HTTP_HEADER_OTHER, CONST_STR_LEN("If-Range")))) { 602 /* if the value is the same as our ETag, we do a Range-request, 603 * otherwise a full 200 */ 604 605 if (vb->ptr[0] == '"') { 606 /** 607 * client wants a ETag 608 */ 609 if (!buffer_is_equal(vb, &r->physical.etag)) { 610 do_range_request = 0; 611 } 612 } else if (!mtime) { 613 /** 614 * we don't have a Last-Modified and can match the If-Range: 615 * 616 * sending all 617 */ 618 do_range_request = 0; 619 } else if (!buffer_is_equal(vb, mtime)) { 620 do_range_request = 0; 621 } 622 } 623 624 if (do_range_request 625 && !buffer_string_is_empty(range) 626 && 0 == strncmp(range->ptr, "bytes=", 6)) { 627 /* support only "bytes" byte-unit */ 628 /* content prepared, I'm done */ 629 r->resp_body_finished = 1; 630 631 if (0 == http_response_parse_range(r, path, sce, range->ptr+6)) { 632 r->http_status = 206; 633 } 634 close(fd); 635 return; 636 } 637 } 638 639 /* if we are still here, prepare body */ 640 641 /* we add it here for all requests 642 * the HEAD request will drop it afterwards again 643 */ 644 645 if (0 == http_chunk_append_file_fd(r, path, fd, sce->st.st_size)) { 646 r->http_status = 200; 647 r->resp_body_finished = 1; 648 } 649 else { 650 r->http_status = 500; 651 } 652 } 653 654 655 static void http_response_xsendfile (request_st * const r, buffer * const path, const array * const xdocroot) { 656 const int status = r->http_status; 657 int valid = 1; 658 659 /* reset Content-Length, if set by backend 660 * Content-Length might later be set to size of X-Sendfile static file, 661 * determined by open(), fstat() to reduces race conditions if the file 662 * is modified between stat() (stat_cache_get_entry()) and open(). */ 663 if (r->resp_htags & HTTP_HEADER_CONTENT_LENGTH) { 664 http_header_response_unset(r, HTTP_HEADER_CONTENT_LENGTH, CONST_STR_LEN("Content-Length")); 665 r->content_length = -1; 666 } 667 668 buffer_urldecode_path(path); 669 if (!buffer_is_valid_UTF8(path)) { 670 log_error(r->conf.errh, __FILE__, __LINE__, 671 "X-Sendfile invalid UTF-8 after url-decode: %s", path->ptr); 672 if (r->http_status < 400) { 673 r->http_status = 502; 674 r->handler_module = NULL; 675 } 676 return; 677 } 678 buffer_path_simplify(path, path); 679 if (r->conf.force_lowercase_filenames) { 680 buffer_to_lower(path); 681 } 682 683 /* check that path is under xdocroot(s) 684 * - xdocroot should have trailing slash appended at config time 685 * - r->conf.force_lowercase_filenames is not a server-wide setting, 686 * and so can not be definitively applied to xdocroot at config time*/ 687 if (xdocroot) { 688 size_t i, xlen = buffer_string_length(path); 689 for (i = 0; i < xdocroot->used; ++i) { 690 data_string *ds = (data_string *)xdocroot->data[i]; 691 size_t dlen = buffer_string_length(&ds->value); 692 if (dlen <= xlen 693 && (!r->conf.force_lowercase_filenames 694 ? 0 == memcmp(path->ptr, ds->value.ptr, dlen) 695 : buffer_eq_icase_ssn(path->ptr, ds->value.ptr, dlen))) { 696 break; 697 } 698 } 699 if (i == xdocroot->used && 0 != i) { 700 log_error(r->conf.errh, __FILE__, __LINE__, 701 "X-Sendfile (%s) not under configured x-sendfile-docroot(s)", path->ptr); 702 r->http_status = 403; 703 valid = 0; 704 } 705 } 706 707 if (valid) http_response_send_file(r, path); 708 709 if (r->http_status >= 400 && status < 300) { 710 r->handler_module = NULL; 711 } else if (0 != status && 200 != status) { 712 r->http_status = status; 713 } 714 } 715 716 717 static void http_response_xsendfile2(request_st * const r, const buffer * const value, const array * const xdocroot) { 718 const char *pos = value->ptr; 719 buffer * const b = r->tmp_buf; 720 const int status = r->http_status; 721 722 /* reset Content-Length, if set by backend */ 723 if (r->resp_htags & HTTP_HEADER_CONTENT_LENGTH) { 724 http_header_response_unset(r, HTTP_HEADER_CONTENT_LENGTH, CONST_STR_LEN("Content-Length")); 725 r->content_length = -1; 726 } 727 728 while (*pos) { 729 const char *filename, *range; 730 stat_cache_entry *sce; 731 off_t begin_range, end_range, range_len; 732 733 while (' ' == *pos) pos++; 734 if (!*pos) break; 735 736 filename = pos; 737 if (NULL == (range = strchr(pos, ' '))) { 738 /* missing range */ 739 log_error(r->conf.errh, __FILE__, __LINE__, 740 "Couldn't find range after filename: %s", filename); 741 r->http_status = 502; 742 break; 743 } 744 buffer_copy_string_len(b, filename, range - filename); 745 746 /* find end of range */ 747 for (pos = ++range; *pos && *pos != ' ' && *pos != ','; pos++) ; 748 749 buffer_urldecode_path(b); 750 if (!buffer_is_valid_UTF8(b)) { 751 log_error(r->conf.errh, __FILE__, __LINE__, 752 "X-Sendfile2 invalid UTF-8 after url-decode: %s", b->ptr); 753 r->http_status = 502; 754 break; 755 } 756 buffer_path_simplify(b, b); 757 if (r->conf.force_lowercase_filenames) { 758 buffer_to_lower(b); 759 } 760 if (xdocroot) { 761 size_t i, xlen = buffer_string_length(b); 762 for (i = 0; i < xdocroot->used; ++i) { 763 data_string *ds = (data_string *)xdocroot->data[i]; 764 size_t dlen = buffer_string_length(&ds->value); 765 if (dlen <= xlen 766 && (!r->conf.force_lowercase_filenames 767 ? 0 == memcmp(b->ptr, ds->value.ptr, dlen) 768 : buffer_eq_icase_ssn(b->ptr, ds->value.ptr, dlen))) { 769 break; 770 } 771 } 772 if (i == xdocroot->used && 0 != i) { 773 log_error(r->conf.errh, __FILE__, __LINE__, 774 "X-Sendfile2 (%s) not under configured x-sendfile-docroot(s)", 775 b->ptr); 776 r->http_status = 403; 777 break; 778 } 779 } 780 781 sce = stat_cache_get_entry(b); 782 if (NULL == sce) { 783 log_error(r->conf.errh, __FILE__, __LINE__, 784 "send-file error: couldn't get stat_cache entry for " 785 "X-Sendfile2: %s", b->ptr); 786 r->http_status = 404; 787 break; 788 } else if (!S_ISREG(sce->st.st_mode)) { 789 log_error(r->conf.errh, __FILE__, __LINE__, 790 "send-file error: wrong filetype for X-Sendfile2: %s", b->ptr); 791 r->http_status = 502; 792 break; 793 } 794 /* found the file */ 795 796 /* parse range */ 797 end_range = sce->st.st_size - 1; 798 { 799 char *rpos = NULL; 800 errno = 0; 801 begin_range = strtoll(range, &rpos, 10); 802 if (errno != 0 || begin_range < 0 || rpos == range) 803 goto range_failed; 804 if ('-' != *rpos++) goto range_failed; 805 if (rpos != pos) { 806 range = rpos; 807 end_range = strtoll(range, &rpos, 10); 808 if (errno != 0 || end_range < 0 || rpos == range) 809 goto range_failed; 810 } 811 if (rpos != pos) goto range_failed; 812 813 goto range_success; 814 815 range_failed: 816 log_error(r->conf.errh, __FILE__, __LINE__, 817 "Couldn't decode range after filename: %s", filename); 818 r->http_status = 502; 819 break; 820 821 range_success: ; 822 } 823 824 /* no parameters accepted */ 825 826 while (*pos == ' ') pos++; 827 if (*pos != '\0' && *pos != ',') { 828 r->http_status = 502; 829 break; 830 } 831 832 range_len = end_range - begin_range + 1; 833 if (range_len < 0) { 834 r->http_status = 502; 835 break; 836 } 837 if (range_len != 0) { 838 if (0 != 839 http_chunk_append_file_range(r, b, begin_range, range_len)) { 840 r->http_status = 502; 841 break; 842 } 843 } 844 845 if (*pos == ',') pos++; 846 } 847 848 if (r->http_status >= 400 && status < 300) { 849 r->handler_module = NULL; 850 } else if (0 != status && 200 != status) { 851 r->http_status = status; 852 } 853 } 854 855 856 void http_response_backend_error (request_st * const r) { 857 if (r->resp_body_started) { 858 /*(response might have been already started, kill the connection)*/ 859 /*(mode == DIRECT to avoid later call to http_response_backend_done())*/ 860 r->handler_module = NULL; /*(avoid sending final chunked block)*/ 861 r->keep_alive = 0; 862 r->resp_body_finished = 1; 863 } /*(else error status set later by http_response_backend_done())*/ 864 } 865 866 void http_response_backend_done (request_st * const r) { 867 /* (not CON_STATE_ERROR and not CON_STATE_RESPONSE_END, 868 * i.e. not called from handle_connection_close or handle_request_reset 869 * hooks, except maybe from errdoc handler, which later resets state)*/ 870 switch (r->state) { 871 case CON_STATE_HANDLE_REQUEST: 872 case CON_STATE_READ_POST: 873 if (!r->resp_body_started) { 874 /* Send an error if we haven't sent any data yet */ 875 r->http_status = 500; 876 r->handler_module = NULL; 877 break; 878 } /* else fall through */ 879 case CON_STATE_WRITE: 880 if (!r->resp_body_finished) { 881 if (r->http_version == HTTP_VERSION_1_1) 882 http_chunk_close(r); 883 r->resp_body_finished = 1; 884 } 885 default: 886 break; 887 } 888 } 889 890 891 void http_response_upgrade_read_body_unknown(request_st * const r) { 892 /* act as transparent proxy */ 893 if (!(r->conf.stream_request_body & FDEVENT_STREAM_REQUEST)) 894 r->conf.stream_request_body |= 895 (FDEVENT_STREAM_REQUEST_BUFMIN | FDEVENT_STREAM_REQUEST); 896 if (!(r->conf.stream_response_body & FDEVENT_STREAM_RESPONSE)) 897 r->conf.stream_response_body |= 898 (FDEVENT_STREAM_RESPONSE_BUFMIN | FDEVENT_STREAM_RESPONSE); 899 r->conf.stream_request_body |= FDEVENT_STREAM_REQUEST_POLLIN; 900 r->reqbody_length = -2; 901 r->keep_alive = 0; 902 } 903 904 905 static handler_t http_response_process_local_redir(request_st * const r, size_t blen) { 906 /* [RFC3875] The Common Gateway Interface (CGI) Version 1.1 907 * [RFC3875] 6.2.2 Local Redirect Response 908 * 909 * The CGI script can return a URI path and query-string 910 * ('local-pathquery') for a local resource in a Location header field. 911 * This indicates to the server that it should reprocess the request 912 * using the path specified. 913 * 914 * local-redir-response = local-Location NL 915 * 916 * The script MUST NOT return any other header fields or a message-body, 917 * and the server MUST generate the response that it would have produced 918 * in response to a request containing the URL 919 * 920 * scheme "://" server-name ":" server-port local-pathquery 921 * 922 * (Might not have begun to receive body yet, but do skip local-redir 923 * if we already have started receiving a response body (blen > 0)) 924 * (Also, while not required by the RFC, do not send local-redir back 925 * to same URL, since CGI should have handled it internally if it 926 * really wanted to do that internally) 927 */ 928 929 /* r->http_status >= 300 && r->http_status < 400) */ 930 size_t ulen = buffer_string_length(&r->uri.path); 931 const buffer *vb = http_header_response_get(r, HTTP_HEADER_LOCATION, CONST_STR_LEN("Location")); 932 if (NULL != vb 933 && vb->ptr[0] == '/' 934 && (0 != strncmp(vb->ptr, r->uri.path.ptr, ulen) 935 || ( vb->ptr[ulen] != '\0' 936 && vb->ptr[ulen] != '/' 937 && vb->ptr[ulen] != '?')) 938 && 0 == blen 939 && !(r->resp_htags & HTTP_HEADER_STATUS) /*no "Status" or NPH response*/ 940 && 1 == r->resp_headers.used) { 941 if (++r->loops_per_request > 5) { 942 log_error(r->conf.errh, __FILE__, __LINE__, 943 "too many internal loops while processing request: %s", 944 r->target_orig.ptr); 945 r->http_status = 500; /* Internal Server Error */ 946 r->handler_module = NULL; 947 return HANDLER_FINISHED; 948 } 949 950 buffer_copy_buffer(&r->target, vb); 951 952 if (r->reqbody_length) { 953 if (r->reqbody_length 954 != r->reqbody_queue->bytes_in) { 955 r->keep_alive = 0; 956 } 957 r->reqbody_length = 0; 958 chunkqueue_reset(r->reqbody_queue); 959 } 960 961 if (r->http_status != 307 && r->http_status != 308) { 962 /* Note: request body (if any) sent to initial dynamic handler 963 * and is not available to the internal redirect */ 964 r->http_method = HTTP_METHOD_GET; 965 } 966 967 /*(caller must reset request as follows)*/ 968 /*http_response_reset(r);*/ /*(sets r->http_status = 0)*/ 969 /*plugins_call_handle_request_reset(r);*/ 970 971 return HANDLER_COMEBACK; 972 } 973 974 return HANDLER_GO_ON; 975 } 976 977 978 static int http_response_process_headers(request_st * const r, http_response_opts * const opts, buffer * const hdrs) { 979 char *ns; 980 const char *s; 981 int line = 0; 982 int status_is_set = 0; 983 984 for (s = hdrs->ptr; NULL != (ns = strchr(s, '\n')); s = ns + 1, ++line) { 985 const char *key, *value; 986 int key_len; 987 enum http_header_e id; 988 989 /* strip the \n */ 990 ns[0] = '\0'; 991 if (ns > s && ns[-1] == '\r') ns[-1] = '\0'; 992 993 if (0 == line && 0 == strncmp(s, "HTTP/1.", 7)) { 994 /* non-parsed headers ... we parse them anyway */ 995 if ((s[7] == '1' || s[7] == '0') && s[8] == ' ') { 996 /* after the space should be a status code for us */ 997 int status = http_header_str_to_code(s+9); 998 if (status >= 100 && status < 1000) { 999 status_is_set = 1; 1000 r->resp_htags |= HTTP_HEADER_STATUS; 1001 r->http_status = status; 1002 } /* else we expected 3 digits and didn't get them */ 1003 } 1004 1005 if (0 == r->http_status) { 1006 log_error(r->conf.errh, __FILE__, __LINE__, 1007 "invalid HTTP status line: %s", s); 1008 r->http_status = 502; /* Bad Gateway */ 1009 r->handler_module = NULL; 1010 return -1; 1011 } 1012 1013 continue; 1014 } 1015 1016 /* parse the headers */ 1017 key = s; 1018 if (NULL == (value = strchr(s, ':'))) { 1019 /* we expect: "<key>: <value>\r\n" */ 1020 continue; 1021 } 1022 1023 key_len = value - key; 1024 do { ++value; } while (*value == ' ' || *value == '\t'); /* skip LWS */ 1025 id = http_header_hkey_get(key, key_len); 1026 1027 if (opts->authorizer) { 1028 if (0 == r->http_status || 200 == r->http_status) { 1029 if (id == HTTP_HEADER_STATUS) { 1030 int status = http_header_str_to_code(value); 1031 if (status >= 100 && status < 1000) { 1032 r->http_status = status; 1033 } else { 1034 r->http_status = 502; /* Bad Gateway */ 1035 break; 1036 } 1037 } 1038 else if (id == HTTP_HEADER_OTHER && key_len > 9 1039 && (key[0] & 0xdf) == 'V' 1040 && buffer_eq_icase_ssn(key, 1041 CONST_STR_LEN("Variable-"))) { 1042 http_header_env_append(r, key + 9, key_len - 9, value, strlen(value)); 1043 } 1044 continue; 1045 } 1046 } 1047 1048 switch (id) { 1049 case HTTP_HEADER_STATUS: 1050 { 1051 if (opts->backend == BACKEND_PROXY) break; /*(pass w/o parse)*/ 1052 int status = http_header_str_to_code(value); 1053 if (status >= 100 && status < 1000) { 1054 r->http_status = status; 1055 status_is_set = 1; 1056 } else { 1057 r->http_status = 502; 1058 r->handler_module = NULL; 1059 } 1060 continue; /* do not send Status to client */ 1061 } 1062 break; 1063 case HTTP_HEADER_UPGRADE: 1064 /*(technically, should also verify Connection: upgrade)*/ 1065 /*(flag only for mod_proxy and mod_cgi (for now))*/ 1066 if (opts->backend != BACKEND_PROXY 1067 && opts->backend != BACKEND_CGI) { 1068 id = HTTP_HEADER_OTHER; 1069 } 1070 if (r->http_version >= HTTP_VERSION_2) continue; 1071 break; 1072 case HTTP_HEADER_CONNECTION: 1073 if (opts->backend == BACKEND_PROXY) continue; 1074 /*(should parse for tokens and do case-insensitive match for "close" 1075 * but this is an imperfect though simplistic attempt to honor 1076 * backend request to close)*/ 1077 if (NULL != strstr(value, "lose")) r->keep_alive = 0; 1078 if (r->http_version >= HTTP_VERSION_2) continue; 1079 break; 1080 case HTTP_HEADER_CONTENT_LENGTH: 1081 r->content_length = strtoul(value, NULL, 10); 1082 if (*value == '+') ++value; 1083 break; 1084 case HTTP_HEADER_TRANSFER_ENCODING: 1085 /*(assumes "Transfer-Encoding: chunked"; does not verify)*/ 1086 r->resp_decode_chunked = 1; 1087 r->gw_dechunk = calloc(1, sizeof(response_dechunk)); 1088 /* XXX: future: might consider using chunk_buffer_acquire() 1089 * and chunk_buffer_release() for r->gw_dechunk->b */ 1090 force_assert(r->gw_dechunk); 1091 continue; 1092 case HTTP_HEADER_HTTP2_SETTINGS: 1093 /* RFC7540 3.2.1 1094 * A server MUST NOT send this header field. */ 1095 /* (not bothering to remove HTTP2-Settings from Connection) */ 1096 continue; 1097 default: 1098 break; 1099 } 1100 1101 http_header_response_insert(r, id, key, key_len, value, strlen(value)); 1102 } 1103 1104 /* CGI/1.1 rev 03 - 7.2.1.2 */ 1105 /* (proxy requires Status-Line, so never true for proxy)*/ 1106 if (!status_is_set && (r->resp_htags & HTTP_HEADER_LOCATION)) { 1107 r->http_status = 302; 1108 } 1109 1110 return 0; 1111 } 1112 1113 1114 __attribute_hot__ 1115 __attribute_pure__ 1116 static const char * 1117 http_response_end_of_header (const char * const restrict ptr) 1118 { 1119 /* find \n(\r)?\n sequence */ 1120 for (const char *n=ptr-1, *nn=NULL; NULL != (n = strchr(n+1, '\n')); nn=n) { 1121 if (n - nn == 2 ? n[-1] == '\r' : n - nn == 1) return n+1; 1122 } 1123 return NULL; 1124 } 1125 1126 1127 __attribute_cold__ 1128 static uint32_t 1129 http_response_discard_1xx (buffer * const restrict b, uint32_t len) 1130 { 1131 char * const ptr = b->ptr; 1132 const char * const n = http_response_end_of_header(ptr+12); 1133 if (NULL == n) return 0; /* * unfinished headers */ 1134 1135 /* discard 100 Continue headers */ 1136 len -= (uint32_t)(n - ptr); 1137 memmove(ptr, n, len); 1138 buffer_string_set_length(b, len); 1139 return len; 1140 } 1141 1142 1143 __attribute_cold__ 1144 __attribute_noinline__ 1145 static uint32_t 1146 http_response_check_1xx (buffer * const restrict b, uint32_t len) 1147 { 1148 const char * const s = b->ptr; 1149 while (len > 7 && 0 == memcmp(s, "HTTP/1.", 7)) { 1150 /* discard HTTP/1.1 1xx responses other than 101 Switching Protocols */ 1151 if (len > 12 1152 && s[8] == ' ' && s[9] == '1' && s[10] == '0' && s[11] != '1') { 1153 len = http_response_discard_1xx(b, len); 1154 continue; 1155 } 1156 break; 1157 } 1158 return len; 1159 } 1160 1161 1162 handler_t http_response_parse_headers(request_st * const r, http_response_opts * const opts, buffer * const b) { 1163 /** 1164 * possible formats of response headers: 1165 * 1166 * proxy or NPH (non-parsed headers): 1167 * 1168 * HTTP/1.0 200 Ok\n 1169 * Header: Value\n 1170 * \n 1171 * 1172 * CGI: 1173 * 1174 * Header: Value\n 1175 * Status: 200\n 1176 * \n 1177 * 1178 * and different mixes of \n and \r\n combinations 1179 * 1180 * Some users also forget about CGI and just send a response 1181 * and hope we handle it. No headers, no header-content separator 1182 */ 1183 1184 uint32_t header_len = buffer_string_length(b); 1185 if (header_len > 12 && b->ptr[9] == '1') { 1186 header_len = http_response_check_1xx(b, header_len); 1187 if (0 == header_len) 1188 return HANDLER_GO_ON; /* unfinished header */ 1189 } 1190 /*("HTTP/1.1 200 " is at least 13 chars + \r\n)*/ 1191 const int is_nph = (header_len > 12 && 0 == memcmp(b->ptr, "HTTP/1.", 7)); 1192 1193 int is_header_end = 0; 1194 uint32_t i = 0, blen; 1195 const char *bstart; 1196 1197 if (b->ptr[0] == '\n' || (b->ptr[0] == '\r' && b->ptr[1] == '\n')) { 1198 /* no HTTP headers */ 1199 i = (b->ptr[0] == '\n') ? 0 : 1; 1200 is_header_end = 1; 1201 } else if (is_nph || b->ptr[(i = strcspn(b->ptr, ":\n"))] == ':') { 1202 /* HTTP headers */ 1203 const char *n = http_response_end_of_header(b->ptr+i+1); 1204 if (n) { 1205 i = (uint32_t)(n - b->ptr - 1); 1206 is_header_end = 1; 1207 } 1208 } else if (i == header_len) { /* (no newline yet; partial header line?) */ 1209 } else if (opts->backend == BACKEND_CGI) { 1210 /* no HTTP headers, but a body (special-case for CGI compat) */ 1211 /* no colon found; does not appear to be HTTP headers */ 1212 if (0 != http_chunk_append_buffer(r, b)) { 1213 return HANDLER_ERROR; 1214 } 1215 r->http_status = 200; /* OK */ 1216 r->resp_body_started = 1; 1217 return HANDLER_GO_ON; 1218 } else { 1219 /* invalid response headers */ 1220 r->http_status = 502; /* Bad Gateway */ 1221 r->handler_module = NULL; 1222 return HANDLER_FINISHED; 1223 } 1224 1225 if (!is_header_end) { 1226 if (header_len > MAX_HTTP_RESPONSE_FIELD_SIZE) { 1227 log_error(r->conf.errh, __FILE__, __LINE__, 1228 "response headers too large for %s", r->uri.path.ptr); 1229 r->http_status = 502; /* Bad Gateway */ 1230 r->handler_module = NULL; 1231 return HANDLER_FINISHED; 1232 } 1233 return HANDLER_GO_ON; 1234 } 1235 1236 /* the body starts after the EOL */ 1237 bstart = b->ptr + (i + 1); 1238 blen = header_len - (i + 1); 1239 1240 /* strip the last \r?\n */ 1241 if (i > 0 && (b->ptr[i - 1] == '\r')) { 1242 i--; 1243 } 1244 1245 buffer_string_set_length(b, i); 1246 1247 if (opts->backend == BACKEND_PROXY && !is_nph) { 1248 /* invalid response Status-Line from HTTP proxy */ 1249 r->http_status = 502; /* Bad Gateway */ 1250 r->handler_module = NULL; 1251 return HANDLER_FINISHED; 1252 } 1253 1254 if (0 != http_response_process_headers(r, opts, b)) { 1255 return HANDLER_ERROR; 1256 } 1257 1258 r->resp_body_started = 1; 1259 1260 if (opts->authorizer 1261 && (r->http_status == 0 || r->http_status == 200)) { 1262 return HANDLER_GO_ON; 1263 } 1264 1265 if (NULL == r->handler_module) { 1266 return HANDLER_FINISHED; 1267 } 1268 1269 if (opts->local_redir && r->http_status >= 300 && r->http_status < 400){ 1270 /*(r->resp_htags & HTTP_HEADER_LOCATION)*/ 1271 handler_t rc = http_response_process_local_redir(r, blen); 1272 if (NULL == r->handler_module) 1273 r->resp_body_started = 0; 1274 if (rc != HANDLER_GO_ON) return rc; 1275 } 1276 1277 if (opts->xsendfile_allow) { 1278 buffer *vb; 1279 /* X-Sendfile2 is deprecated; historical for fastcgi */ 1280 if (opts->backend == BACKEND_FASTCGI 1281 && NULL != (vb = http_header_response_get(r, HTTP_HEADER_OTHER, CONST_STR_LEN("X-Sendfile2")))) { 1282 http_response_xsendfile2(r, vb, opts->xsendfile_docroot); 1283 /* http_header_response_unset() shortcut for HTTP_HEADER_OTHER */ 1284 buffer_clear(vb); /*(do not send to client)*/ 1285 if (NULL == r->handler_module) 1286 r->resp_body_started = 0; 1287 return HANDLER_FINISHED; 1288 } else if (NULL != (vb = http_header_response_get(r, HTTP_HEADER_OTHER, CONST_STR_LEN("X-Sendfile"))) 1289 || (opts->backend == BACKEND_FASTCGI /* X-LIGHTTPD-send-file is deprecated; historical for fastcgi */ 1290 && NULL != (vb = http_header_response_get(r, HTTP_HEADER_OTHER, CONST_STR_LEN("X-LIGHTTPD-send-file"))))) { 1291 http_response_xsendfile(r, vb, opts->xsendfile_docroot); 1292 /* http_header_response_unset() shortcut for HTTP_HEADER_OTHER */ 1293 buffer_clear(vb); /*(do not send to client)*/ 1294 if (NULL == r->handler_module) 1295 r->resp_body_started = 0; 1296 return HANDLER_FINISHED; 1297 } 1298 } 1299 1300 if (blen > 0) { 1301 if (0 != http_chunk_decode_append_mem(r, bstart, blen)) 1302 return HANDLER_ERROR; 1303 } 1304 1305 /* (callback for response headers complete) */ 1306 return (opts->headers) ? opts->headers(r, opts) : HANDLER_GO_ON; 1307 } 1308 1309 1310 handler_t http_response_read(request_st * const r, http_response_opts * const opts, buffer * const b, fdnode * const fdn) { 1311 const int fd = fdn->fd; 1312 while (1) { 1313 ssize_t n; 1314 size_t avail = buffer_string_space(b); 1315 unsigned int toread = 0; 1316 1317 if (0 == fdevent_ioctl_fionread(fd, opts->fdfmt, (int *)&toread)) { 1318 if (avail < toread) { 1319 size_t blen = buffer_string_length(b); 1320 if (toread + blen < 4096) 1321 toread = 4095 - blen; 1322 else if (toread > MAX_READ_LIMIT) 1323 toread = MAX_READ_LIMIT; 1324 } 1325 else if (0 == toread) { 1326 #if 0 1327 return (fdevent_fdnode_interest(fdn) & FDEVENT_IN) 1328 ? HANDLER_FINISHED /* read finished */ 1329 : HANDLER_GO_ON; /* optimistic read; data not ready */ 1330 #else 1331 if (!(fdevent_fdnode_interest(fdn) & FDEVENT_IN)) { 1332 if (!(r->conf.stream_response_body 1333 & FDEVENT_STREAM_RESPONSE_POLLRDHUP)) 1334 return HANDLER_GO_ON;/*optimistic read; data not ready*/ 1335 } 1336 if (0 == avail) /* let read() below indicate if EOF or EAGAIN */ 1337 toread = 1024; 1338 #endif 1339 } 1340 } 1341 else if (avail < 1024) { 1342 toread = 4095 - avail; 1343 } 1344 1345 if (r->conf.stream_response_body & FDEVENT_STREAM_RESPONSE_BUFMIN) { 1346 off_t cqlen = chunkqueue_length(r->write_queue); 1347 if (cqlen + (off_t)toread > 65536 - 4096) { 1348 if (!r->con->is_writable) { 1349 /*(defer removal of FDEVENT_IN interest since 1350 * connection_state_machine() might be able to send data 1351 * immediately, unless !con->is_writable, where 1352 * connection_state_machine() might not loop back to call 1353 * mod_proxy_handle_subrequest())*/ 1354 fdevent_fdnode_event_clr(r->con->srv->ev, fdn, FDEVENT_IN); 1355 } 1356 if (cqlen >= 65536-1) return HANDLER_GO_ON; 1357 toread = 65536 - 1 - (unsigned int)cqlen; 1358 /* Note: heuristic is fuzzy in that it limits how much to read 1359 * from backend based on how much is pending to write to client. 1360 * Modules where data from backend is framed (e.g. FastCGI) may 1361 * want to limit how much is buffered from backend while waiting 1362 * for a complete data frame or data packet from backend. */ 1363 } 1364 } 1365 1366 if (avail < toread) { 1367 /*(add avail+toread to reduce allocations when ioctl EOPNOTSUPP)*/ 1368 avail = avail ? avail - 1 + toread : toread; 1369 buffer_string_prepare_append(b, avail); 1370 } 1371 1372 n = read(fd, b->ptr+buffer_string_length(b), avail); 1373 1374 if (n < 0) { 1375 switch (errno) { 1376 case EAGAIN: 1377 #ifdef EWOULDBLOCK 1378 #if EWOULDBLOCK != EAGAIN 1379 case EWOULDBLOCK: 1380 #endif 1381 #endif 1382 case EINTR: 1383 return HANDLER_GO_ON; 1384 default: 1385 log_perror(r->conf.errh, __FILE__, __LINE__, 1386 "read() %d %d", r->con->fd, fd); 1387 return HANDLER_ERROR; 1388 } 1389 } 1390 1391 buffer_commit(b, (size_t)n); 1392 #ifdef __COVERITY__ 1393 /* Coverity Scan overlooks the effect of buffer_commit() */ 1394 b->ptr[buffer_string_length(b)+n] = '\0'; 1395 #endif 1396 1397 if (NULL != opts->parse) { 1398 handler_t rc = opts->parse(r, opts, b, (size_t)n); 1399 if (rc != HANDLER_GO_ON) return rc; 1400 } else if (0 == n) { 1401 /* note: no further data is sent to backend after read EOF on socket 1402 * (not checking for half-closed TCP socket) 1403 * (backend should read all data desired prior to closing socket, 1404 * though might send app-level close data frame, if applicable) */ 1405 return HANDLER_FINISHED; /* read finished */ 1406 } else if (0 == r->resp_body_started) { 1407 /* split header from body */ 1408 handler_t rc = http_response_parse_headers(r, opts, b); 1409 if (rc != HANDLER_GO_ON) return rc; 1410 /* accumulate response in b until headers completed (or error) */ 1411 if (r->resp_body_started) buffer_clear(b); 1412 } else { 1413 if (0 != http_chunk_decode_append_buffer(r, b)) { 1414 /* error writing to tempfile; 1415 * truncate response or send 500 if nothing sent yet */ 1416 return HANDLER_ERROR; 1417 } 1418 buffer_clear(b); 1419 } 1420 1421 if (r->conf.stream_response_body & FDEVENT_STREAM_RESPONSE_BUFMIN) { 1422 if (chunkqueue_length(r->write_queue) > 65536 - 4096) { 1423 /*(defer removal of FDEVENT_IN interest since 1424 * connection_state_machine() might be able to send 1425 * data immediately, unless !con->is_writable, where 1426 * connection_state_machine() might not loop back to 1427 * call the subrequest handler)*/ 1428 if (!r->con->is_writable) 1429 fdevent_fdnode_event_clr(r->con->srv->ev, fdn, FDEVENT_IN); 1430 break; 1431 } 1432 } 1433 1434 if ((size_t)n < avail) 1435 break; /* emptied kernel read buffer or partial read */ 1436 } 1437 1438 return HANDLER_GO_ON; 1439 } 1440 1441 1442 int http_cgi_headers (request_st * const r, http_cgi_opts * const opts, http_cgi_header_append_cb cb, void *vdata) { 1443 1444 /* CGI-SPEC 6.1.2, FastCGI spec 6.3 and SCGI spec */ 1445 1446 int rc = 0; 1447 const connection * const con = r->con; 1448 server_socket * const srv_sock = con->srv_socket; 1449 buffer * const tb = r->tmp_buf; 1450 const char *s; 1451 size_t n; 1452 char buf[LI_ITOSTRING_LENGTH]; 1453 sock_addr *addr; 1454 sock_addr addrbuf; 1455 char b2[INET6_ADDRSTRLEN + 1]; 1456 1457 /* (CONTENT_LENGTH must be first for SCGI) */ 1458 if (!opts->authorizer) { 1459 rc |= cb(vdata, CONST_STR_LEN("CONTENT_LENGTH"), 1460 buf, li_itostrn(buf,sizeof(buf),r->reqbody_length)); 1461 } 1462 1463 if (!buffer_string_is_empty(&r->uri.query)) { 1464 rc |= cb(vdata, CONST_STR_LEN("QUERY_STRING"), 1465 CONST_BUF_LEN(&r->uri.query)); 1466 } else { 1467 rc |= cb(vdata, CONST_STR_LEN("QUERY_STRING"), 1468 CONST_STR_LEN("")); 1469 } 1470 if (!buffer_string_is_empty(opts->strip_request_uri)) { 1471 /** 1472 * /app1/index/list 1473 * 1474 * stripping /app1 or /app1/ should lead to 1475 * 1476 * /index/list 1477 * 1478 */ 1479 size_t len = buffer_string_length(opts->strip_request_uri); 1480 if ('/' == opts->strip_request_uri->ptr[len-1]) { 1481 --len; 1482 } 1483 1484 if (buffer_string_length(&r->target_orig) >= len 1485 && 0 == memcmp(r->target_orig.ptr, 1486 opts->strip_request_uri->ptr, len) 1487 && r->target_orig.ptr[len] == '/') { 1488 rc |= cb(vdata, CONST_STR_LEN("REQUEST_URI"), 1489 r->target_orig.ptr+len, 1490 buffer_string_length(&r->target_orig)-len); 1491 } else { 1492 rc |= cb(vdata, CONST_STR_LEN("REQUEST_URI"), 1493 CONST_BUF_LEN(&r->target_orig)); 1494 } 1495 } else { 1496 rc |= cb(vdata, CONST_STR_LEN("REQUEST_URI"), 1497 CONST_BUF_LEN(&r->target_orig)); 1498 } 1499 if (!buffer_is_equal(&r->target, &r->target_orig)) { 1500 rc |= cb(vdata, CONST_STR_LEN("REDIRECT_URI"), 1501 CONST_BUF_LEN(&r->target)); 1502 } 1503 /* set REDIRECT_STATUS for php compiled with --force-redirect 1504 * (if REDIRECT_STATUS has not already been set by error handler) */ 1505 if (0 == r->error_handler_saved_status) { 1506 rc |= cb(vdata, CONST_STR_LEN("REDIRECT_STATUS"), 1507 CONST_STR_LEN("200")); 1508 } 1509 1510 /* 1511 * SCRIPT_NAME, PATH_INFO and PATH_TRANSLATED according to 1512 * http://cgi-spec.golux.com/draft-coar-cgi-v11-03-clean.html 1513 * (6.1.14, 6.1.6, 6.1.7) 1514 */ 1515 if (!opts->authorizer) { 1516 rc |= cb(vdata, CONST_STR_LEN("SCRIPT_NAME"), 1517 CONST_BUF_LEN(&r->uri.path)); 1518 if (!buffer_string_is_empty(&r->pathinfo)) { 1519 rc |= cb(vdata, CONST_STR_LEN("PATH_INFO"), 1520 CONST_BUF_LEN(&r->pathinfo)); 1521 /* PATH_TRANSLATED is only defined if PATH_INFO is set */ 1522 if (!buffer_string_is_empty(opts->docroot)) { 1523 buffer_copy_buffer(tb, opts->docroot); 1524 } else { 1525 buffer_copy_buffer(tb, &r->physical.basedir); 1526 } 1527 buffer_append_string_buffer(tb, &r->pathinfo); 1528 rc |= cb(vdata, CONST_STR_LEN("PATH_TRANSLATED"), 1529 CONST_BUF_LEN(tb)); 1530 } 1531 } 1532 1533 /* 1534 * SCRIPT_FILENAME and DOCUMENT_ROOT for php 1535 * The PHP manual http://www.php.net/manual/en/reserved.variables.php 1536 * treatment of PATH_TRANSLATED is different from the one of CGI specs. 1537 * (see php.ini cgi.fix_pathinfo = 1 config parameter) 1538 */ 1539 1540 if (!buffer_string_is_empty(opts->docroot)) { 1541 /* alternate docroot, e.g. for remote FastCGI or SCGI server */ 1542 buffer_copy_buffer(tb, opts->docroot); 1543 buffer_append_string_buffer(tb, &r->uri.path); 1544 rc |= cb(vdata, CONST_STR_LEN("SCRIPT_FILENAME"), 1545 CONST_BUF_LEN(tb)); 1546 rc |= cb(vdata, CONST_STR_LEN("DOCUMENT_ROOT"), 1547 CONST_BUF_LEN(opts->docroot)); 1548 } else { 1549 if (opts->break_scriptfilename_for_php) { 1550 /* php.ini config cgi.fix_pathinfo = 1 need a broken SCRIPT_FILENAME 1551 * to find out what PATH_INFO is itself 1552 * 1553 * see src/sapi/cgi_main.c, init_request_info() 1554 */ 1555 buffer_copy_buffer(tb, &r->physical.path); 1556 buffer_append_string_buffer(tb, &r->pathinfo); 1557 rc |= cb(vdata, CONST_STR_LEN("SCRIPT_FILENAME"), 1558 CONST_BUF_LEN(tb)); 1559 } else { 1560 rc |= cb(vdata, CONST_STR_LEN("SCRIPT_FILENAME"), 1561 CONST_BUF_LEN(&r->physical.path)); 1562 } 1563 rc |= cb(vdata, CONST_STR_LEN("DOCUMENT_ROOT"), 1564 CONST_BUF_LEN(&r->physical.basedir)); 1565 } 1566 1567 s = get_http_method_name(r->http_method); 1568 force_assert(s); 1569 rc |= cb(vdata, CONST_STR_LEN("REQUEST_METHOD"), s, strlen(s)); 1570 1571 s = get_http_version_name(r->http_version); 1572 force_assert(s); 1573 rc |= cb(vdata, CONST_STR_LEN("SERVER_PROTOCOL"), s, strlen(s)); 1574 1575 rc |= cb(vdata, CONST_STR_LEN("SERVER_SOFTWARE"), 1576 CONST_BUF_LEN(r->conf.server_tag)); 1577 1578 rc |= cb(vdata, CONST_STR_LEN("GATEWAY_INTERFACE"), 1579 CONST_STR_LEN("CGI/1.1")); 1580 1581 rc |= cb(vdata, CONST_STR_LEN("REQUEST_SCHEME"), 1582 CONST_BUF_LEN(&r->uri.scheme)); 1583 1584 if (buffer_is_equal_string(&r->uri.scheme, CONST_STR_LEN("https"))) { 1585 rc |= cb(vdata, CONST_STR_LEN("HTTPS"), CONST_STR_LEN("on")); 1586 } 1587 1588 addr = &srv_sock->addr; 1589 rc |= cb(vdata, CONST_STR_LEN("SERVER_PORT"), 1590 buf, li_utostrn(buf,sizeof(buf),sock_addr_get_port(addr))); 1591 1592 switch (addr->plain.sa_family) { 1593 case AF_INET: 1594 case AF_INET6: 1595 if (sock_addr_is_addr_wildcard(addr)) { 1596 socklen_t addrlen = sizeof(addrbuf); 1597 if (0 == getsockname(con->fd,(struct sockaddr *)&addrbuf,&addrlen)){ 1598 addr = &addrbuf; 1599 } else { 1600 s = ""; 1601 break; 1602 } 1603 } 1604 s = sock_addr_inet_ntop(addr, b2, sizeof(b2)-1); 1605 if (NULL == s) s = ""; 1606 break; 1607 default: 1608 s = ""; 1609 break; 1610 } 1611 force_assert(s); 1612 rc |= cb(vdata, CONST_STR_LEN("SERVER_ADDR"), s, strlen(s)); 1613 1614 if (!buffer_string_is_empty(r->server_name)) { 1615 size_t len = buffer_string_length(r->server_name); 1616 1617 if (r->server_name->ptr[0] == '[') { 1618 const char *colon = strstr(r->server_name->ptr, "]:"); 1619 if (colon) len = (colon + 1) - r->server_name->ptr; 1620 } else { 1621 const char *colon = strchr(r->server_name->ptr, ':'); 1622 if (colon) len = colon - r->server_name->ptr; 1623 } 1624 1625 rc |= cb(vdata, CONST_STR_LEN("SERVER_NAME"), 1626 r->server_name->ptr, len); 1627 } else { 1628 /* set to be same as SERVER_ADDR (above) */ 1629 rc |= cb(vdata, CONST_STR_LEN("SERVER_NAME"), s, strlen(s)); 1630 } 1631 1632 rc |= cb(vdata, CONST_STR_LEN("REMOTE_ADDR"), 1633 CONST_BUF_LEN(con->dst_addr_buf)); 1634 1635 rc |= cb(vdata, CONST_STR_LEN("REMOTE_PORT"), buf, 1636 li_utostrn(buf,sizeof(buf),sock_addr_get_port(&con->dst_addr))); 1637 1638 for (n = 0; n < r->rqst_headers.used; n++) { 1639 data_string *ds = (data_string *)r->rqst_headers.data[n]; 1640 if (!buffer_string_is_empty(&ds->value) && !buffer_is_empty(&ds->key)) { 1641 /* Security: Do not emit HTTP_PROXY in environment. 1642 * Some executables use HTTP_PROXY to configure 1643 * outgoing proxy. See also https://httpoxy.org/ */ 1644 if (buffer_is_equal_caseless_string(&ds->key, 1645 CONST_STR_LEN("Proxy"))) { 1646 continue; 1647 } 1648 buffer_copy_string_encoded_cgi_varnames(tb, 1649 CONST_BUF_LEN(&ds->key), 1); 1650 rc |= cb(vdata, CONST_BUF_LEN(tb), 1651 CONST_BUF_LEN(&ds->value)); 1652 } 1653 } 1654 1655 con->srv->request_env(r); 1656 1657 for (n = 0; n < r->env.used; n++) { 1658 data_string *ds = (data_string *)r->env.data[n]; 1659 if (!buffer_is_empty(&ds->value) && !buffer_is_empty(&ds->key)) { 1660 buffer_copy_string_encoded_cgi_varnames(tb, 1661 CONST_BUF_LEN(&ds->key), 0); 1662 rc |= cb(vdata, CONST_BUF_LEN(tb), 1663 CONST_BUF_LEN(&ds->value)); 1664 } 1665 } 1666 1667 return rc; 1668 } 1669