1 /* $NetBSD: http.c,v 1.5 2024/02/02 22:19:05 christos Exp $ */ 2 /*- 3 * Copyright (c) 2000-2004 Dag-Erling Co�dan Sm�rgrav 4 * Copyright (c) 2003 Thomas Klausner <wiz@NetBSD.org> 5 * Copyright (c) 2008, 2009 Joerg Sonnenberger <joerg@NetBSD.org> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer 13 * in this position and unchanged. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 * 31 * $FreeBSD: http.c,v 1.83 2008/02/06 11:39:55 des Exp $ 32 */ 33 34 /* 35 * The following copyright applies to the base64 code: 36 * 37 *- 38 * Copyright 1997 Massachusetts Institute of Technology 39 * 40 * Permission to use, copy, modify, and distribute this software and 41 * its documentation for any purpose and without fee is hereby 42 * granted, provided that both the above copyright notice and this 43 * permission notice appear in all copies, that both the above 44 * copyright notice and this permission notice appear in all 45 * supporting documentation, and that the name of M.I.T. not be used 46 * in advertising or publicity pertaining to distribution of the 47 * software without specific, written prior permission. M.I.T. makes 48 * no representations about the suitability of this software for any 49 * purpose. It is provided "as is" without express or implied 50 * warranty. 51 * 52 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 53 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 54 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 55 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 56 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 57 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 58 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 59 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 60 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 61 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 62 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 */ 65 66 #if defined(__linux__) || defined(__MINT__) || defined(__FreeBSD_kernel__) 67 /* Keep this down to Linux or MiNT, it can create surprises elsewhere. */ 68 /* 69 __FreeBSD_kernel__ is defined for GNU/kFreeBSD. 70 See http://glibc-bsd.alioth.debian.org/porting/PORTING . 71 */ 72 #define _GNU_SOURCE 73 #endif 74 75 #ifndef _REENTRANT 76 /* Needed for gmtime_r on Interix */ 77 #define _REENTRANT 78 #endif 79 80 #if HAVE_CONFIG_H 81 #include "config.h" 82 #endif 83 #ifndef NETBSD 84 #include <nbcompat.h> 85 #endif 86 87 #include <sys/types.h> 88 #include <sys/socket.h> 89 90 #include <ctype.h> 91 #include <errno.h> 92 #include <locale.h> 93 #include <stdarg.h> 94 #ifndef NETBSD 95 #include <nbcompat/stdio.h> 96 #else 97 #include <stdio.h> 98 #endif 99 #include <stdlib.h> 100 #include <string.h> 101 #include <time.h> 102 #include <unistd.h> 103 104 #include <netinet/in.h> 105 #include <netinet/tcp.h> 106 107 #ifndef NETBSD 108 #include <nbcompat/netdb.h> 109 #else 110 #include <netdb.h> 111 #endif 112 113 #include <arpa/inet.h> 114 115 #include "fetch.h" 116 #include "common.h" 117 #include "httperr.h" 118 119 /* Maximum number of redirects to follow */ 120 #define MAX_REDIRECT 5 121 122 /* Symbolic names for reply codes we care about */ 123 #define HTTP_OK 200 124 #define HTTP_PARTIAL 206 125 #define HTTP_MOVED_PERM 301 126 #define HTTP_MOVED_TEMP 302 127 #define HTTP_SEE_OTHER 303 128 #define HTTP_NOT_MODIFIED 304 129 #define HTTP_TEMP_REDIRECT 307 130 #define HTTP_NEED_AUTH 401 131 #define HTTP_NEED_PROXY_AUTH 407 132 #define HTTP_BAD_RANGE 416 133 #define HTTP_PROTOCOL_ERROR 999 134 135 #define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \ 136 || (xyz) == HTTP_MOVED_TEMP \ 137 || (xyz) == HTTP_TEMP_REDIRECT \ 138 || (xyz) == HTTP_SEE_OTHER) 139 140 #define HTTP_ERROR(xyz) ((xyz) > 400 && (xyz) < 599) 141 142 143 /***************************************************************************** 144 * I/O functions for decoding chunked streams 145 */ 146 147 struct httpio 148 { 149 conn_t *conn; /* connection */ 150 int chunked; /* chunked mode */ 151 int keep_alive; /* keep-alive mode */ 152 char *buf; /* chunk buffer */ 153 size_t bufsize; /* size of chunk buffer */ 154 ssize_t buflen; /* amount of data currently in buffer */ 155 size_t bufpos; /* current read offset in buffer */ 156 int eof; /* end-of-file flag */ 157 int error; /* error flag */ 158 size_t chunksize; /* remaining size of current chunk */ 159 off_t contentlength; /* remaining size of the content */ 160 }; 161 162 /* 163 * Get next chunk header 164 */ 165 static ssize_t 166 http_new_chunk(struct httpio *io) 167 { 168 char *p; 169 170 if (fetch_getln(io->conn) == -1) 171 return (-1); 172 173 if (io->conn->buflen < 2 || !isxdigit((unsigned char)*io->conn->buf)) 174 return (-1); 175 176 for (p = io->conn->buf; *p && !isspace((unsigned char)*p); ++p) { 177 if (*p == ';') 178 break; 179 if (!isxdigit((unsigned char)*p)) 180 return (-1); 181 if (isdigit((unsigned char)*p)) { 182 io->chunksize = io->chunksize * 16 + 183 *p - '0'; 184 } else { 185 io->chunksize = io->chunksize * 16 + 186 10 + tolower((unsigned char)*p) - 'a'; 187 } 188 } 189 190 return (io->chunksize); 191 } 192 193 /* 194 * Grow the input buffer to at least len bytes 195 */ 196 static int 197 http_growbuf(struct httpio *io, size_t len) 198 { 199 char *tmp; 200 201 if (io->bufsize >= len) 202 return (0); 203 204 if ((tmp = realloc(io->buf, len)) == NULL) 205 return (-1); 206 io->buf = tmp; 207 io->bufsize = len; 208 return (0); 209 } 210 211 /* 212 * Fill the input buffer, do chunk decoding on the fly 213 */ 214 static ssize_t 215 http_fillbuf(struct httpio *io, size_t len) 216 { 217 if (io->error) 218 return (-1); 219 if (io->eof) 220 return (0); 221 222 if (io->contentlength >= 0 && (off_t)len > io->contentlength) 223 len = io->contentlength; 224 225 if (io->chunked == 0) { 226 if (http_growbuf(io, len) == -1) 227 return (-1); 228 if ((io->buflen = fetch_read(io->conn, io->buf, len)) == -1) { 229 io->error = 1; 230 return (-1); 231 } 232 if (io->contentlength) 233 io->contentlength -= io->buflen; 234 io->bufpos = 0; 235 return (io->buflen); 236 } 237 238 if (io->chunksize == 0) { 239 switch (http_new_chunk(io)) { 240 case -1: 241 io->error = 1; 242 return (-1); 243 case 0: 244 io->eof = 1; 245 if (fetch_getln(io->conn) == -1) 246 return (-1); 247 return (0); 248 } 249 } 250 251 if (len > io->chunksize) 252 len = io->chunksize; 253 if (http_growbuf(io, len) == -1) 254 return (-1); 255 if ((io->buflen = fetch_read(io->conn, io->buf, len)) == -1) { 256 io->error = 1; 257 return (-1); 258 } 259 io->chunksize -= io->buflen; 260 if (io->contentlength >= 0) 261 io->contentlength -= io->buflen; 262 263 if (io->chunksize == 0) { 264 char endl[2]; 265 ssize_t len2; 266 267 len2 = fetch_read(io->conn, endl, 2); 268 if (len2 == 1 && fetch_read(io->conn, endl + 1, 1) != 1) 269 return (-1); 270 if (len2 == -1 || endl[0] != '\r' || endl[1] != '\n') 271 return (-1); 272 } 273 274 io->bufpos = 0; 275 276 return (io->buflen); 277 } 278 279 /* 280 * Read function 281 */ 282 static ssize_t 283 http_readfn(void *v, void *buf, size_t len) 284 { 285 struct httpio *io = (struct httpio *)v; 286 size_t l, pos; 287 288 if (io->error) 289 return (-1); 290 if (io->eof) 291 return (0); 292 293 for (pos = 0; len > 0; pos += l, len -= l) { 294 /* empty buffer */ 295 if (!io->buf || (ssize_t)io->bufpos == io->buflen) 296 if (http_fillbuf(io, len) < 1) 297 break; 298 l = io->buflen - io->bufpos; 299 if (len < l) 300 l = len; 301 memcpy((char *)buf + pos, io->buf + io->bufpos, l); 302 io->bufpos += l; 303 } 304 305 if (!pos && io->error) 306 return (-1); 307 return (pos); 308 } 309 310 /* 311 * Write function 312 */ 313 static ssize_t 314 http_writefn(void *v, const void *buf, size_t len) 315 { 316 struct httpio *io = (struct httpio *)v; 317 318 return (fetch_write(io->conn, buf, len)); 319 } 320 321 /* 322 * Close function 323 */ 324 static void 325 http_closefn(void *v) 326 { 327 struct httpio *io = (struct httpio *)v; 328 329 if (io->keep_alive) { 330 int val; 331 332 val = 0; 333 setsockopt(io->conn->sd, IPPROTO_TCP, TCP_NODELAY, &val, 334 (socklen_t)sizeof(val)); 335 fetch_cache_put(io->conn, fetch_close); 336 #if defined(TCP_NOPUSH) && !defined(__APPLE__) 337 val = 1; 338 setsockopt(io->conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, 339 sizeof(val)); 340 #endif 341 } else { 342 fetch_close(io->conn); 343 } 344 345 free(io->buf); 346 free(io); 347 } 348 349 /* 350 * Wrap a file descriptor up 351 */ 352 static fetchIO * 353 http_funopen(conn_t *conn, int chunked, int keep_alive, off_t clength) 354 { 355 struct httpio *io; 356 fetchIO *f; 357 358 if ((io = calloc(1, sizeof(*io))) == NULL) { 359 fetch_syserr(); 360 return (NULL); 361 } 362 io->conn = conn; 363 io->chunked = chunked; 364 io->contentlength = clength; 365 io->keep_alive = keep_alive; 366 f = fetchIO_unopen(io, http_readfn, http_writefn, http_closefn); 367 if (f == NULL) { 368 fetch_syserr(); 369 free(io); 370 return (NULL); 371 } 372 return (f); 373 } 374 375 376 /***************************************************************************** 377 * Helper functions for talking to the server and parsing its replies 378 */ 379 380 /* Header types */ 381 typedef enum { 382 hdr_syserror = -2, 383 hdr_error = -1, 384 hdr_end = 0, 385 hdr_unknown = 1, 386 hdr_connection, 387 hdr_content_length, 388 hdr_content_range, 389 hdr_last_modified, 390 hdr_location, 391 hdr_transfer_encoding, 392 hdr_www_authenticate 393 } hdr_t; 394 395 /* Names of interesting headers */ 396 static struct { 397 hdr_t num; 398 const char *name; 399 } hdr_names[] = { 400 { hdr_connection, "Connection" }, 401 { hdr_content_length, "Content-Length" }, 402 { hdr_content_range, "Content-Range" }, 403 { hdr_last_modified, "Last-Modified" }, 404 { hdr_location, "Location" }, 405 { hdr_transfer_encoding, "Transfer-Encoding" }, 406 { hdr_www_authenticate, "WWW-Authenticate" }, 407 { hdr_unknown, NULL }, 408 }; 409 410 /* 411 * Send a formatted line; optionally echo to terminal 412 */ 413 LIBFETCH_PRINTFLIKE(2, 3) 414 static int 415 http_cmd(conn_t *conn, const char *fmt, ...) 416 { 417 va_list ap; 418 size_t len; 419 char *msg; 420 ssize_t r; 421 422 va_start(ap, fmt); 423 len = vasprintf(&msg, fmt, ap); 424 va_end(ap); 425 426 if (msg == NULL) { 427 errno = ENOMEM; 428 fetch_syserr(); 429 return (-1); 430 } 431 432 r = fetch_write(conn, msg, len); 433 free(msg); 434 435 if (r == -1) { 436 fetch_syserr(); 437 return (-1); 438 } 439 440 return (0); 441 } 442 443 /* 444 * Get and parse status line 445 */ 446 static int 447 http_get_reply(conn_t *conn) 448 { 449 char *p; 450 451 if (fetch_getln(conn) == -1) 452 return (-1); 453 /* 454 * A valid status line looks like "HTTP/m.n xyz reason" where m 455 * and n are the major and minor protocol version numbers and xyz 456 * is the reply code. 457 * Unfortunately, there are servers out there (NCSA 1.5.1, to name 458 * just one) that do not send a version number, so we can't rely 459 * on finding one, but if we do, insist on it being 1.0 or 1.1. 460 * We don't care about the reason phrase. 461 */ 462 if (strncmp(conn->buf, "HTTP", 4) != 0) 463 return (HTTP_PROTOCOL_ERROR); 464 p = conn->buf + 4; 465 if (*p == '/') { 466 if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1')) 467 return (HTTP_PROTOCOL_ERROR); 468 p += 4; 469 } 470 if (*p != ' ' || 471 !isdigit((unsigned char)p[1]) || 472 !isdigit((unsigned char)p[2]) || 473 !isdigit((unsigned char)p[3])) 474 return (HTTP_PROTOCOL_ERROR); 475 476 conn->err = (p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0'); 477 return (conn->err); 478 } 479 480 /* 481 * Check a header; if the type matches the given string, return a pointer 482 * to the beginning of the value. 483 */ 484 static const char * 485 http_match(const char *str, const char *hdr) 486 { 487 while (*str && *hdr && 488 tolower((unsigned char)*str++) == tolower((unsigned char)*hdr++)) 489 /* nothing */; 490 if (*str || *hdr != ':') 491 return (NULL); 492 while (*hdr && isspace((unsigned char)*++hdr)) 493 /* nothing */; 494 return (hdr); 495 } 496 497 /* 498 * Get the next header and return the appropriate symbolic code. 499 */ 500 static hdr_t 501 http_next_header(conn_t *conn, const char **p) 502 { 503 int i; 504 505 if (fetch_getln(conn) == -1) 506 return (hdr_syserror); 507 while (conn->buflen && isspace((unsigned char)conn->buf[conn->buflen - 1])) 508 conn->buflen--; 509 conn->buf[conn->buflen] = '\0'; 510 if (conn->buflen == 0) 511 return (hdr_end); 512 /* 513 * We could check for malformed headers but we don't really care. 514 * A valid header starts with a token immediately followed by a 515 * colon; a token is any sequence of non-control, non-whitespace 516 * characters except "()<>@,;:\\\"{}". 517 */ 518 for (i = 0; hdr_names[i].num != hdr_unknown; i++) 519 if ((*p = http_match(hdr_names[i].name, conn->buf)) != NULL) 520 return (hdr_names[i].num); 521 return (hdr_unknown); 522 } 523 524 /* 525 * Parse a last-modified header 526 */ 527 static int 528 http_parse_mtime(const char *p, time_t *mtime) 529 { 530 struct tm tm; 531 char *r; 532 533 #ifdef LC_C_LOCALE 534 r = strptime_l(p, "%a, %d %b %Y %H:%M:%S GMT", &tm, LC_C_LOCALE); 535 #else 536 char *locale; 537 538 locale = strdup(setlocale(LC_TIME, NULL)); 539 if (locale == NULL) 540 return (-1); 541 542 setlocale(LC_TIME, "C"); 543 r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm); 544 /* XXX should add support for date-2 and date-3 */ 545 setlocale(LC_TIME, locale); 546 free(locale); 547 #endif 548 if (r == NULL) 549 return (-1); 550 *mtime = timegm(&tm); 551 return (0); 552 } 553 554 /* 555 * Parse a content-length header 556 */ 557 static int 558 http_parse_length(const char *p, off_t *length) 559 { 560 off_t len; 561 562 for (len = 0; *p && isdigit((unsigned char)*p); ++p) 563 len = len * 10 + (*p - '0'); 564 if (*p) 565 return (-1); 566 *length = len; 567 return (0); 568 } 569 570 /* 571 * Parse a content-range header 572 */ 573 static int 574 http_parse_range(const char *p, off_t *offset, off_t *length, off_t *size) 575 { 576 off_t first, last, len; 577 578 if (strncasecmp(p, "bytes ", 6) != 0) 579 return (-1); 580 p += 6; 581 if (*p == '*') { 582 first = last = -1; 583 ++p; 584 } else { 585 for (first = 0; *p && isdigit((unsigned char)*p); ++p) 586 first = first * 10 + *p - '0'; 587 if (*p != '-') 588 return (-1); 589 for (last = 0, ++p; *p && isdigit((unsigned char)*p); ++p) 590 last = last * 10 + *p - '0'; 591 } 592 if (first > last || *p != '/') 593 return (-1); 594 for (len = 0, ++p; *p && isdigit((unsigned char)*p); ++p) 595 len = len * 10 + *p - '0'; 596 if (*p || len < last - first + 1) 597 return (-1); 598 if (first == -1) 599 *length = 0; 600 else 601 *length = last - first + 1; 602 *offset = first; 603 *size = len; 604 return (0); 605 } 606 607 608 /***************************************************************************** 609 * Helper functions for authorization 610 */ 611 612 /* 613 * Base64 encoding 614 */ 615 static char * 616 http_base64(const char *src) 617 { 618 static const char base64[] = 619 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 620 "abcdefghijklmnopqrstuvwxyz" 621 "0123456789+/"; 622 char *str, *dst; 623 size_t l; 624 unsigned int t, r; 625 626 l = strlen(src); 627 if ((str = malloc(((l + 2) / 3) * 4 + 1)) == NULL) 628 return (NULL); 629 dst = str; 630 r = 0; 631 632 while (l >= 3) { 633 t = (src[0] << 16) | (src[1] << 8) | src[2]; 634 dst[0] = base64[(t >> 18) & 0x3f]; 635 dst[1] = base64[(t >> 12) & 0x3f]; 636 dst[2] = base64[(t >> 6) & 0x3f]; 637 dst[3] = base64[(t >> 0) & 0x3f]; 638 src += 3; l -= 3; 639 dst += 4; r += 4; 640 } 641 642 switch (l) { 643 case 2: 644 t = (src[0] << 16) | (src[1] << 8); 645 dst[0] = base64[(t >> 18) & 0x3f]; 646 dst[1] = base64[(t >> 12) & 0x3f]; 647 dst[2] = base64[(t >> 6) & 0x3f]; 648 dst[3] = '='; 649 dst += 4; 650 r += 4; 651 break; 652 case 1: 653 t = src[0] << 16; 654 dst[0] = base64[(t >> 18) & 0x3f]; 655 dst[1] = base64[(t >> 12) & 0x3f]; 656 dst[2] = dst[3] = '='; 657 dst += 4; 658 r += 4; 659 break; 660 case 0: 661 break; 662 } 663 664 *dst = 0; 665 return (str); 666 } 667 668 /* 669 * Encode username and password 670 */ 671 static int 672 http_basic_auth(conn_t *conn, const char *hdr, const char *usr, const char *pwd) 673 { 674 char *upw, *auth; 675 int r; 676 677 if (asprintf(&upw, "%s:%s", usr, pwd) == -1) 678 return (-1); 679 auth = http_base64(upw); 680 free(upw); 681 if (auth == NULL) 682 return (-1); 683 r = http_cmd(conn, "%s: Basic %s\r\n", hdr, auth); 684 free(auth); 685 return (r); 686 } 687 688 /* 689 * Send an authorization header 690 */ 691 static int 692 http_authorize(conn_t *conn, const char *hdr, const char *p) 693 { 694 /* basic authorization */ 695 if (strncasecmp(p, "basic:", 6) == 0) { 696 char *user, *pwd, *str; 697 int r; 698 699 /* skip realm */ 700 for (p += 6; *p && *p != ':'; ++p) 701 /* nothing */ ; 702 if (!*p || strchr(++p, ':') == NULL) 703 return (-1); 704 if ((str = strdup(p)) == NULL) 705 return (-1); /* XXX */ 706 user = str; 707 pwd = strchr(str, ':'); 708 *pwd++ = '\0'; 709 r = http_basic_auth(conn, hdr, user, pwd); 710 free(str); 711 return (r); 712 } 713 return (-1); 714 } 715 716 717 /***************************************************************************** 718 * Helper functions for connecting to a server or proxy 719 */ 720 721 /* 722 * Connect to the correct HTTP server or proxy. 723 */ 724 static conn_t * 725 http_connect(struct url *URL, struct url *purl, const char *flags, int *cached) 726 { 727 struct url *curl; 728 conn_t *conn; 729 hdr_t h; 730 const char *p; 731 int af, verbose; 732 #if defined(TCP_NOPUSH) && !defined(__APPLE__) 733 int val; 734 #endif 735 736 *cached = 0; 737 738 #ifdef INET6 739 af = AF_UNSPEC; 740 #else 741 af = AF_INET; 742 #endif 743 744 verbose = CHECK_FLAG('v'); 745 if (CHECK_FLAG('4')) 746 af = AF_INET; 747 #ifdef INET6 748 else if (CHECK_FLAG('6')) 749 af = AF_INET6; 750 #endif 751 752 curl = (purl != NULL) ? purl : URL; 753 if (purl && strcasecmp(URL->scheme, SCHEME_HTTPS) != 0) { 754 URL = purl; 755 } else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) { 756 /* can't talk http to an ftp server */ 757 /* XXX should set an error code */ 758 return (NULL); 759 } 760 761 if ((conn = fetch_cache_get(curl, af)) != NULL) { 762 *cached = 1; 763 return (conn); 764 } 765 766 if ((conn = fetch_connect(curl, af, verbose)) == NULL) 767 /* fetch_connect() has already set an error code */ 768 return (NULL); 769 if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 && purl) { 770 http_cmd(conn, "CONNECT %s:%d HTTP/1.1\r\n", 771 URL->host, URL->port); 772 http_cmd(conn, "Host: %s:%d\r\n", 773 URL->host, URL->port); 774 http_cmd(conn, "\r\n"); 775 if (http_get_reply(conn) != HTTP_OK) { 776 http_seterr(conn->err); 777 goto ouch; 778 } 779 /* Read and discard the rest of the proxy response */ 780 if (fetch_getln(conn) < 0) { 781 fetch_syserr(); 782 goto ouch; 783 } 784 do { 785 switch ((h = http_next_header(conn, &p))) { 786 case hdr_syserror: 787 fetch_syserr(); 788 goto ouch; 789 case hdr_error: 790 http_seterr(HTTP_PROTOCOL_ERROR); 791 goto ouch; 792 default: 793 /* ignore */ ; 794 } 795 } while (h < hdr_end); 796 } 797 if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 && 798 fetch_ssl(conn, URL, verbose) == -1) { 799 /* grrr */ 800 #ifdef EAUTH 801 errno = EAUTH; 802 #else 803 errno = EPERM; 804 #endif 805 goto ouch; 806 } 807 808 #if defined(TCP_NOPUSH) && !defined(__APPLE__) 809 val = 1; 810 setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, sizeof(val)); 811 #endif 812 813 return (conn); 814 ouch: 815 fetch_close(conn); 816 return (NULL); 817 } 818 819 static struct url * 820 http_get_proxy(struct url * url, const char *flags) 821 { 822 struct url *purl; 823 char *p; 824 825 if (flags != NULL && strchr(flags, 'd') != NULL) 826 return (NULL); 827 if (fetch_no_proxy_match(url->host)) 828 return (NULL); 829 if (((p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 830 *p && (purl = fetchParseURL(p))) { 831 if (!*purl->scheme) 832 strcpy(purl->scheme, SCHEME_HTTP); 833 if (!purl->port) 834 purl->port = fetch_default_proxy_port(purl->scheme); 835 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 836 return (purl); 837 fetchFreeURL(purl); 838 } 839 return (NULL); 840 } 841 842 static void 843 set_if_modified_since(conn_t *conn, time_t last_modified) 844 { 845 static const char weekdays[] = "SunMonTueWedThuFriSat"; 846 static const char months[] = "JanFebMarAprMayJunJulAugSepOctNovDec"; 847 struct tm tm; 848 char buf[80]; 849 gmtime_r(&last_modified, &tm); 850 snprintf(buf, sizeof(buf), "%.3s, %02d %.3s %4ld %02d:%02d:%02d GMT", 851 weekdays + tm.tm_wday * 3, tm.tm_mday, months + tm.tm_mon * 3, 852 (long)tm.tm_year + 1900, tm.tm_hour, tm.tm_min, tm.tm_sec); 853 http_cmd(conn, "If-Modified-Since: %s\r\n", buf); 854 } 855 856 857 /***************************************************************************** 858 * Core 859 */ 860 861 /* 862 * Send a request and process the reply 863 * 864 * XXX This function is way too long, the do..while loop should be split 865 * XXX off into a separate function. 866 */ 867 fetchIO * 868 http_request(struct url *URL, const char *op, struct url_stat *us, 869 struct url *purl, const char *flags) 870 { 871 conn_t *conn; 872 struct url *url, *new; 873 int chunked, direct, if_modified_since, need_auth, noredirect; 874 int keep_alive, verbose, cached; 875 int e, i, n, val; 876 off_t offset, clength, length, size; 877 time_t mtime; 878 const char *p; 879 fetchIO *f; 880 hdr_t h; 881 char hbuf[URL_HOSTLEN + 7], *host; 882 883 direct = CHECK_FLAG('d'); 884 noredirect = CHECK_FLAG('A'); 885 verbose = CHECK_FLAG('v'); 886 if_modified_since = CHECK_FLAG('i'); 887 keep_alive = 0; 888 889 if (direct && purl) { 890 fetchFreeURL(purl); 891 purl = NULL; 892 } 893 894 /* try the provided URL first */ 895 url = URL; 896 897 /* if the A flag is set, we only get one try */ 898 n = noredirect ? 1 : MAX_REDIRECT; 899 i = 0; 900 901 e = HTTP_PROTOCOL_ERROR; 902 need_auth = 0; 903 do { 904 new = NULL; 905 chunked = 0; 906 offset = 0; 907 clength = -1; 908 length = -1; 909 size = -1; 910 mtime = 0; 911 912 /* check port */ 913 if (!url->port) 914 url->port = fetch_default_port(url->scheme); 915 916 /* were we redirected to an FTP URL? */ 917 if (purl == NULL && strcmp(url->scheme, SCHEME_FTP) == 0) { 918 if (strcmp(op, "GET") == 0) 919 return (ftp_request(url, "RETR", NULL, us, purl, flags)); 920 else if (strcmp(op, "HEAD") == 0) 921 return (ftp_request(url, "STAT", NULL, us, purl, flags)); 922 } 923 924 /* connect to server or proxy */ 925 if ((conn = http_connect(url, purl, flags, &cached)) == NULL) 926 goto ouch; 927 928 host = url->host; 929 #ifdef INET6 930 if (strchr(url->host, ':')) { 931 snprintf(hbuf, sizeof(hbuf), "[%s]", url->host); 932 host = hbuf; 933 } 934 #endif 935 if (url->port != fetch_default_port(url->scheme)) { 936 if (host != hbuf) { 937 strcpy(hbuf, host); 938 host = hbuf; 939 } 940 snprintf(hbuf + strlen(hbuf), 941 sizeof(hbuf) - strlen(hbuf), ":%d", url->port); 942 } 943 944 /* send request */ 945 if (verbose) 946 fetch_info("requesting %s://%s%s", 947 url->scheme, host, url->doc); 948 if (purl && strcasecmp(URL->scheme, SCHEME_HTTPS) != 0) { 949 http_cmd(conn, "%s %s://%s%s HTTP/1.1\r\n", 950 op, url->scheme, host, url->doc); 951 } else { 952 http_cmd(conn, "%s %s HTTP/1.1\r\n", 953 op, url->doc); 954 } 955 956 if (if_modified_since && url->last_modified > 0) 957 set_if_modified_since(conn, url->last_modified); 958 959 /* virtual host */ 960 http_cmd(conn, "Host: %s\r\n", host); 961 962 /* proxy authorization */ 963 if (purl) { 964 if (*purl->user || *purl->pwd) 965 http_basic_auth(conn, "Proxy-Authorization", 966 purl->user, purl->pwd); 967 else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL && *p != '\0') 968 http_authorize(conn, "Proxy-Authorization", p); 969 } 970 971 /* server authorization */ 972 if (need_auth || *url->user || *url->pwd) { 973 if (*url->user || *url->pwd) 974 http_basic_auth(conn, "Authorization", url->user, url->pwd); 975 else if ((p = getenv("HTTP_AUTH")) != NULL && *p != '\0') 976 http_authorize(conn, "Authorization", p); 977 else if (fetchAuthMethod && fetchAuthMethod(url) == 0) { 978 http_basic_auth(conn, "Authorization", url->user, url->pwd); 979 } else { 980 http_seterr(HTTP_NEED_AUTH); 981 goto ouch; 982 } 983 } 984 985 /* other headers */ 986 if ((p = getenv("HTTP_REFERER")) != NULL && *p != '\0') { 987 if (strcasecmp(p, "auto") == 0) 988 http_cmd(conn, "Referer: %s://%s%s\r\n", 989 url->scheme, host, url->doc); 990 else 991 http_cmd(conn, "Referer: %s\r\n", p); 992 } 993 if ((p = getenv("HTTP_USER_AGENT")) != NULL && *p != '\0') 994 http_cmd(conn, "User-Agent: %s\r\n", p); 995 else 996 http_cmd(conn, "User-Agent: %s\r\n", _LIBFETCH_VER); 997 if (url->offset > 0) 998 http_cmd(conn, "Range: bytes=%lld-\r\n", (long long)url->offset); 999 http_cmd(conn, "\r\n"); 1000 1001 /* 1002 * Force the queued request to be dispatched. Normally, one 1003 * would do this with shutdown(2) but squid proxies can be 1004 * configured to disallow such half-closed connections. To 1005 * be compatible with such configurations, fiddle with socket 1006 * options to force the pending data to be written. 1007 */ 1008 #if defined(TCP_NOPUSH) && !defined(__APPLE__) 1009 val = 0; 1010 setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, 1011 sizeof(val)); 1012 #endif 1013 val = 1; 1014 setsockopt(conn->sd, IPPROTO_TCP, TCP_NODELAY, &val, 1015 (socklen_t)sizeof(val)); 1016 1017 /* get reply */ 1018 switch (http_get_reply(conn)) { 1019 case HTTP_OK: 1020 case HTTP_PARTIAL: 1021 case HTTP_NOT_MODIFIED: 1022 /* fine */ 1023 break; 1024 case HTTP_MOVED_PERM: 1025 case HTTP_MOVED_TEMP: 1026 case HTTP_SEE_OTHER: 1027 /* 1028 * Not so fine, but we still have to read the 1029 * headers to get the new location. 1030 */ 1031 break; 1032 case HTTP_NEED_AUTH: 1033 if (need_auth) { 1034 /* 1035 * We already sent out authorization code, 1036 * so there's nothing more we can do. 1037 */ 1038 http_seterr(conn->err); 1039 goto ouch; 1040 } 1041 /* try again, but send the password this time */ 1042 if (verbose) 1043 fetch_info("server requires authorization"); 1044 break; 1045 case HTTP_NEED_PROXY_AUTH: 1046 /* 1047 * If we're talking to a proxy, we already sent 1048 * our proxy authorization code, so there's 1049 * nothing more we can do. 1050 */ 1051 http_seterr(conn->err); 1052 goto ouch; 1053 case HTTP_BAD_RANGE: 1054 /* 1055 * This can happen if we ask for 0 bytes because 1056 * we already have the whole file. Consider this 1057 * a success for now, and check sizes later. 1058 */ 1059 break; 1060 case HTTP_PROTOCOL_ERROR: 1061 /* fall through */ 1062 case -1: 1063 --i; 1064 if (cached) 1065 continue; 1066 fetch_syserr(); 1067 goto ouch; 1068 default: 1069 http_seterr(conn->err); 1070 if (!verbose) 1071 goto ouch; 1072 /* fall through so we can get the full error message */ 1073 } 1074 1075 /* get headers */ 1076 do { 1077 switch ((h = http_next_header(conn, &p))) { 1078 case hdr_syserror: 1079 fetch_syserr(); 1080 goto ouch; 1081 case hdr_error: 1082 http_seterr(HTTP_PROTOCOL_ERROR); 1083 goto ouch; 1084 case hdr_connection: 1085 /* XXX too weak? */ 1086 keep_alive = (strcasecmp(p, "keep-alive") == 0); 1087 break; 1088 case hdr_content_length: 1089 http_parse_length(p, &clength); 1090 break; 1091 case hdr_content_range: 1092 http_parse_range(p, &offset, &length, &size); 1093 break; 1094 case hdr_last_modified: 1095 http_parse_mtime(p, &mtime); 1096 break; 1097 case hdr_location: 1098 if (!HTTP_REDIRECT(conn->err)) 1099 break; 1100 if (new) 1101 free(new); 1102 if (verbose) 1103 fetch_info("%d redirect to %s", conn->err, p); 1104 if (*p == '/') 1105 /* absolute path */ 1106 new = fetchMakeURL(url->scheme, url->host, url->port, p, 1107 url->user, url->pwd); 1108 else 1109 new = fetchParseURL(p); 1110 if (new == NULL) { 1111 /* XXX should set an error code */ 1112 goto ouch; 1113 } 1114 if (!*new->user && !*new->pwd) { 1115 strcpy(new->user, url->user); 1116 strcpy(new->pwd, url->pwd); 1117 } 1118 new->offset = url->offset; 1119 new->length = url->length; 1120 break; 1121 case hdr_transfer_encoding: 1122 /* XXX weak test*/ 1123 chunked = (strcasecmp(p, "chunked") == 0); 1124 break; 1125 case hdr_www_authenticate: 1126 if (conn->err != HTTP_NEED_AUTH) 1127 break; 1128 /* if we were smarter, we'd check the method and realm */ 1129 break; 1130 case hdr_end: 1131 /* fall through */ 1132 case hdr_unknown: 1133 /* ignore */ 1134 break; 1135 } 1136 } while (h > hdr_end); 1137 1138 /* we need to provide authentication */ 1139 if (conn->err == HTTP_NEED_AUTH) { 1140 e = conn->err; 1141 need_auth = 1; 1142 fetch_close(conn); 1143 conn = NULL; 1144 continue; 1145 } 1146 1147 /* requested range not satisfiable */ 1148 if (conn->err == HTTP_BAD_RANGE) { 1149 if (url->offset == size && url->length == 0) { 1150 /* asked for 0 bytes; fake it */ 1151 offset = url->offset; 1152 conn->err = HTTP_OK; 1153 break; 1154 } else { 1155 http_seterr(conn->err); 1156 goto ouch; 1157 } 1158 } 1159 1160 /* we have a hit or an error */ 1161 if (conn->err == HTTP_OK || 1162 conn->err == HTTP_PARTIAL || 1163 conn->err == HTTP_NOT_MODIFIED || 1164 HTTP_ERROR(conn->err)) 1165 break; 1166 1167 /* all other cases: we got a redirect */ 1168 e = conn->err; 1169 need_auth = 0; 1170 fetch_close(conn); 1171 conn = NULL; 1172 if (!new) 1173 break; 1174 if (url != URL) 1175 fetchFreeURL(url); 1176 url = new; 1177 } while (++i < n); 1178 1179 /* we failed, or ran out of retries */ 1180 if (conn == NULL) { 1181 http_seterr(e); 1182 goto ouch; 1183 } 1184 1185 /* check for inconsistencies */ 1186 if (clength != -1 && length != -1 && clength != length) { 1187 http_seterr(HTTP_PROTOCOL_ERROR); 1188 goto ouch; 1189 } 1190 if (clength == -1) 1191 clength = length; 1192 if (clength != -1) 1193 length = offset + clength; 1194 if (length != -1 && size != -1 && length != size) { 1195 http_seterr(HTTP_PROTOCOL_ERROR); 1196 goto ouch; 1197 } 1198 if (size == -1) 1199 size = length; 1200 1201 /* fill in stats */ 1202 if (us) { 1203 us->size = size; 1204 us->atime = us->mtime = mtime; 1205 } 1206 1207 /* too far? */ 1208 if (URL->offset > 0 && offset > URL->offset) { 1209 http_seterr(HTTP_PROTOCOL_ERROR); 1210 goto ouch; 1211 } 1212 1213 /* report back real offset and size */ 1214 URL->offset = offset; 1215 URL->length = clength; 1216 1217 if (clength == -1 && !chunked) 1218 keep_alive = 0; 1219 1220 if (conn->err == HTTP_NOT_MODIFIED) { 1221 http_seterr(HTTP_NOT_MODIFIED); 1222 if (keep_alive) { 1223 fetch_cache_put(conn, fetch_close); 1224 conn = NULL; 1225 } 1226 goto ouch; 1227 } 1228 1229 /* wrap it up in a fetchIO */ 1230 if ((f = http_funopen(conn, chunked, keep_alive, clength)) == NULL) { 1231 fetch_syserr(); 1232 goto ouch; 1233 } 1234 1235 if (url != URL) 1236 fetchFreeURL(url); 1237 if (purl) 1238 fetchFreeURL(purl); 1239 1240 if (HTTP_ERROR(conn->err)) { 1241 1242 if (keep_alive) { 1243 char buf[512]; 1244 do { 1245 } while (fetchIO_read(f, buf, sizeof(buf)) > 0); 1246 } 1247 1248 fetchIO_close(f); 1249 f = NULL; 1250 } 1251 1252 return (f); 1253 1254 ouch: 1255 if (url != URL) 1256 fetchFreeURL(url); 1257 if (purl) 1258 fetchFreeURL(purl); 1259 if (conn != NULL) 1260 fetch_close(conn); 1261 return (NULL); 1262 } 1263 1264 1265 /***************************************************************************** 1266 * Entry points 1267 */ 1268 1269 /* 1270 * Retrieve and stat a file by HTTP 1271 */ 1272 fetchIO * 1273 fetchXGetHTTP(struct url *URL, struct url_stat *us, const char *flags) 1274 { 1275 return (http_request(URL, "GET", us, http_get_proxy(URL, flags), flags)); 1276 } 1277 1278 /* 1279 * Retrieve a file by HTTP 1280 */ 1281 fetchIO * 1282 fetchGetHTTP(struct url *URL, const char *flags) 1283 { 1284 return (fetchXGetHTTP(URL, NULL, flags)); 1285 } 1286 1287 /* 1288 * Store a file by HTTP 1289 */ 1290 fetchIO * 1291 /*ARGSUSED*/ 1292 fetchPutHTTP(struct url *URL __unused, const char *flags __unused) 1293 { 1294 fprintf(stderr, "fetchPutHTTP(): not implemented\n"); 1295 return (NULL); 1296 } 1297 1298 /* 1299 * Get an HTTP document's metadata 1300 */ 1301 int 1302 fetchStatHTTP(struct url *URL, struct url_stat *us, const char *flags) 1303 { 1304 fetchIO *f; 1305 1306 f = http_request(URL, "HEAD", us, http_get_proxy(URL, flags), flags); 1307 if (f == NULL) 1308 return (-1); 1309 fetchIO_close(f); 1310 return (0); 1311 } 1312 1313 enum http_states { 1314 ST_NONE, 1315 ST_LT, 1316 ST_LTA, 1317 ST_TAGA, 1318 ST_H, 1319 ST_R, 1320 ST_E, 1321 ST_F, 1322 ST_HREF, 1323 ST_HREFQ, 1324 ST_TAG, 1325 ST_TAGAX, 1326 ST_TAGAQ 1327 }; 1328 1329 struct index_parser { 1330 struct url_list *ue; 1331 struct url *url; 1332 enum http_states state; 1333 }; 1334 1335 static ssize_t 1336 parse_index(struct index_parser *parser, const char *buf, size_t len) 1337 { 1338 char *end_attr, p = *buf; 1339 1340 switch (parser->state) { 1341 case ST_NONE: 1342 /* Plain text, not in markup */ 1343 if (p == '<') 1344 parser->state = ST_LT; 1345 return 1; 1346 case ST_LT: 1347 /* In tag -- "<" already found */ 1348 if (p == '>') 1349 parser->state = ST_NONE; 1350 else if (p == 'a' || p == 'A') 1351 parser->state = ST_LTA; 1352 else if (!isspace((unsigned char)p)) 1353 parser->state = ST_TAG; 1354 return 1; 1355 case ST_LTA: 1356 /* In tag -- "<a" already found */ 1357 if (p == '>') 1358 parser->state = ST_NONE; 1359 else if (p == '"') 1360 parser->state = ST_TAGAQ; 1361 else if (isspace((unsigned char)p)) 1362 parser->state = ST_TAGA; 1363 else 1364 parser->state = ST_TAG; 1365 return 1; 1366 case ST_TAG: 1367 /* In tag, but not "<a" -- disregard */ 1368 if (p == '>') 1369 parser->state = ST_NONE; 1370 return 1; 1371 case ST_TAGA: 1372 /* In a-tag -- "<a " already found */ 1373 if (p == '>') 1374 parser->state = ST_NONE; 1375 else if (p == '"') 1376 parser->state = ST_TAGAQ; 1377 else if (p == 'h' || p == 'H') 1378 parser->state = ST_H; 1379 else if (!isspace((unsigned char)p)) 1380 parser->state = ST_TAGAX; 1381 return 1; 1382 case ST_TAGAX: 1383 /* In unknown keyword in a-tag */ 1384 if (p == '>') 1385 parser->state = ST_NONE; 1386 else if (p == '"') 1387 parser->state = ST_TAGAQ; 1388 else if (isspace((unsigned char)p)) 1389 parser->state = ST_TAGA; 1390 return 1; 1391 case ST_TAGAQ: 1392 /* In a-tag, unknown argument for keys. */ 1393 if (p == '>') 1394 parser->state = ST_NONE; 1395 else if (p == '"') 1396 parser->state = ST_TAGA; 1397 return 1; 1398 case ST_H: 1399 /* In a-tag -- "<a h" already found */ 1400 if (p == '>') 1401 parser->state = ST_NONE; 1402 else if (p == '"') 1403 parser->state = ST_TAGAQ; 1404 else if (p == 'r' || p == 'R') 1405 parser->state = ST_R; 1406 else if (isspace((unsigned char)p)) 1407 parser->state = ST_TAGA; 1408 else 1409 parser->state = ST_TAGAX; 1410 return 1; 1411 case ST_R: 1412 /* In a-tag -- "<a hr" already found */ 1413 if (p == '>') 1414 parser->state = ST_NONE; 1415 else if (p == '"') 1416 parser->state = ST_TAGAQ; 1417 else if (p == 'e' || p == 'E') 1418 parser->state = ST_E; 1419 else if (isspace((unsigned char)p)) 1420 parser->state = ST_TAGA; 1421 else 1422 parser->state = ST_TAGAX; 1423 return 1; 1424 case ST_E: 1425 /* In a-tag -- "<a hre" already found */ 1426 if (p == '>') 1427 parser->state = ST_NONE; 1428 else if (p == '"') 1429 parser->state = ST_TAGAQ; 1430 else if (p == 'f' || p == 'F') 1431 parser->state = ST_F; 1432 else if (isspace((unsigned char)p)) 1433 parser->state = ST_TAGA; 1434 else 1435 parser->state = ST_TAGAX; 1436 return 1; 1437 case ST_F: 1438 /* In a-tag -- "<a href" already found */ 1439 if (p == '>') 1440 parser->state = ST_NONE; 1441 else if (p == '"') 1442 parser->state = ST_TAGAQ; 1443 else if (p == '=') 1444 parser->state = ST_HREF; 1445 else if (!isspace((unsigned char)p)) 1446 parser->state = ST_TAGAX; 1447 return 1; 1448 case ST_HREF: 1449 /* In a-tag -- "<a href=" already found */ 1450 if (p == '>') 1451 parser->state = ST_NONE; 1452 else if (p == '"') 1453 parser->state = ST_HREFQ; 1454 else if (!isspace((unsigned char)p)) 1455 parser->state = ST_TAGA; 1456 return 1; 1457 case ST_HREFQ: 1458 /* In href of the a-tag */ 1459 end_attr = memchr(buf, '"', len); 1460 if (end_attr == NULL) 1461 return 0; 1462 *end_attr = '\0'; 1463 parser->state = ST_TAGA; 1464 if (fetch_add_entry(parser->ue, parser->url, buf, 1)) 1465 return -1; 1466 return end_attr + 1 - buf; 1467 } 1468 /* NOTREACHED */ 1469 abort(); 1470 } 1471 1472 struct http_index_cache { 1473 struct http_index_cache *next; 1474 struct url *location; 1475 struct url_list ue; 1476 }; 1477 1478 static struct http_index_cache *index_cache; 1479 1480 /* 1481 * List a directory 1482 */ 1483 int 1484 /*ARGSUSED*/ 1485 fetchListHTTP(struct url_list *ue, struct url *url, const char *pattern __unused, const char *flags) 1486 { 1487 fetchIO *f; 1488 char buf[2 * PATH_MAX]; 1489 size_t buf_len, sum_processed; 1490 ssize_t read_len, processed; 1491 struct index_parser state; 1492 struct http_index_cache *cache = NULL; 1493 int do_cache, ret; 1494 1495 do_cache = CHECK_FLAG('c'); 1496 1497 if (do_cache) { 1498 for (cache = index_cache; cache != NULL; cache = cache->next) { 1499 if (strcmp(cache->location->scheme, url->scheme)) 1500 continue; 1501 if (strcmp(cache->location->user, url->user)) 1502 continue; 1503 if (strcmp(cache->location->pwd, url->pwd)) 1504 continue; 1505 if (strcmp(cache->location->host, url->host)) 1506 continue; 1507 if (cache->location->port != url->port) 1508 continue; 1509 if (strcmp(cache->location->doc, url->doc)) 1510 continue; 1511 return fetchAppendURLList(ue, &cache->ue); 1512 } 1513 1514 cache = malloc(sizeof(*cache)); 1515 fetchInitURLList(&cache->ue); 1516 cache->location = fetchCopyURL(url); 1517 } 1518 1519 f = fetchGetHTTP(url, flags); 1520 if (f == NULL) { 1521 if (do_cache) { 1522 fetchFreeURLList(&cache->ue); 1523 fetchFreeURL(cache->location); 1524 free(cache); 1525 } 1526 return -1; 1527 } 1528 1529 state.url = url; 1530 state.state = ST_NONE; 1531 if (do_cache) { 1532 state.ue = &cache->ue; 1533 } else { 1534 state.ue = ue; 1535 } 1536 1537 buf_len = 0; 1538 1539 while ((read_len = fetchIO_read(f, buf + buf_len, sizeof(buf) - buf_len)) > 0) { 1540 buf_len += read_len; 1541 sum_processed = 0; 1542 do { 1543 processed = parse_index(&state, buf + sum_processed, buf_len); 1544 if (processed == -1) 1545 break; 1546 buf_len -= processed; 1547 sum_processed += processed; 1548 } while (processed != 0 && buf_len > 0); 1549 if (processed == -1) { 1550 read_len = -1; 1551 break; 1552 } 1553 memmove(buf, buf + sum_processed, buf_len); 1554 } 1555 1556 fetchIO_close(f); 1557 1558 ret = read_len < 0 ? -1 : 0; 1559 1560 if (do_cache) { 1561 if (ret == 0) { 1562 cache->next = index_cache; 1563 index_cache = cache; 1564 } 1565 1566 if (fetchAppendURLList(ue, &cache->ue)) 1567 ret = -1; 1568 } 1569 1570 return ret; 1571 } 1572