1 /*- 2 * Copyright (c) 2000 Dag-Erling Co�dan Sm�rgrav 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 /* 32 * The following copyright applies to the base64 code: 33 * 34 *- 35 * Copyright 1997 Massachusetts Institute of Technology 36 * 37 * Permission to use, copy, modify, and distribute this software and 38 * its documentation for any purpose and without fee is hereby 39 * granted, provided that both the above copyright notice and this 40 * permission notice appear in all copies, that both the above 41 * copyright notice and this permission notice appear in all 42 * supporting documentation, and that the name of M.I.T. not be used 43 * in advertising or publicity pertaining to distribution of the 44 * software without specific, written prior permission. M.I.T. makes 45 * no representations about the suitability of this software for any 46 * purpose. It is provided "as is" without express or implied 47 * warranty. 48 * 49 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 50 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 51 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 52 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 53 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 54 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 55 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 56 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 57 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 58 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 59 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 */ 62 63 #include <sys/param.h> 64 #include <sys/socket.h> 65 66 #include <ctype.h> 67 #include <err.h> 68 #include <errno.h> 69 #include <locale.h> 70 #include <netdb.h> 71 #include <stdarg.h> 72 #include <stdio.h> 73 #include <stdlib.h> 74 #include <string.h> 75 #include <time.h> 76 #include <unistd.h> 77 78 #include "fetch.h" 79 #include "common.h" 80 #include "httperr.h" 81 82 extern char *__progname; /* XXX not portable */ 83 84 /* Maximum number of redirects to follow */ 85 #define MAX_REDIRECT 5 86 87 /* Symbolic names for reply codes we care about */ 88 #define HTTP_OK 200 89 #define HTTP_PARTIAL 206 90 #define HTTP_MOVED_PERM 301 91 #define HTTP_MOVED_TEMP 302 92 #define HTTP_SEE_OTHER 303 93 #define HTTP_NEED_AUTH 401 94 #define HTTP_NEED_PROXY_AUTH 403 95 #define HTTP_PROTOCOL_ERROR 999 96 97 #define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \ 98 || (xyz) == HTTP_MOVED_TEMP \ 99 || (xyz) == HTTP_SEE_OTHER) 100 101 102 103 /***************************************************************************** 104 * I/O functions for decoding chunked streams 105 */ 106 107 struct cookie 108 { 109 int fd; 110 char *buf; 111 size_t b_size; 112 size_t b_len; 113 int b_pos; 114 int eof; 115 int error; 116 long chunksize; 117 #ifndef NDEBUG 118 long total; 119 #endif 120 }; 121 122 /* 123 * Get next chunk header 124 */ 125 static int 126 _http_new_chunk(struct cookie *c) 127 { 128 char *p; 129 130 if (_fetch_getln(c->fd, &c->buf, &c->b_size, &c->b_len) == -1) 131 return -1; 132 133 if (c->b_len < 2 || !ishexnumber(*c->buf)) 134 return -1; 135 136 for (p = c->buf; !isspace(*p) && *p != ';' && p < c->buf + c->b_len; ++p) 137 if (!ishexnumber(*p)) 138 return -1; 139 else if (isdigit(*p)) 140 c->chunksize = c->chunksize * 16 + *p - '0'; 141 else 142 c->chunksize = c->chunksize * 16 + 10 + tolower(*p) - 'a'; 143 144 #ifndef NDEBUG 145 c->total += c->chunksize; 146 if (c->chunksize == 0) 147 fprintf(stderr, "\033[1m_http_fillbuf(): " 148 "end of last chunk\033[m\n"); 149 else 150 fprintf(stderr, "\033[1m_http_fillbuf(): " 151 "new chunk: %ld (%ld)\033[m\n", c->chunksize, c->total); 152 #endif 153 154 return c->chunksize; 155 } 156 157 /* 158 * Fill the input buffer, do chunk decoding on the fly 159 */ 160 static int 161 _http_fillbuf(struct cookie *c) 162 { 163 if (c->error) 164 return -1; 165 if (c->eof) 166 return 0; 167 168 if (c->chunksize == 0) { 169 switch (_http_new_chunk(c)) { 170 case -1: 171 c->error = 1; 172 return -1; 173 case 0: 174 c->eof = 1; 175 return 0; 176 } 177 } 178 179 if (c->b_size < c->chunksize) { 180 char *tmp; 181 182 if ((tmp = realloc(c->buf, c->chunksize)) == NULL) 183 return -1; 184 c->buf = tmp; 185 c->b_size = c->chunksize; 186 } 187 188 if ((c->b_len = read(c->fd, c->buf, c->chunksize)) == -1) 189 return -1; 190 c->chunksize -= c->b_len; 191 192 if (c->chunksize == 0) { 193 char endl[2]; 194 read(c->fd, endl, 2); 195 } 196 197 c->b_pos = 0; 198 199 return c->b_len; 200 } 201 202 /* 203 * Read function 204 */ 205 static int 206 _http_readfn(void *v, char *buf, int len) 207 { 208 struct cookie *c = (struct cookie *)v; 209 int l, pos; 210 211 if (c->error) 212 return -1; 213 if (c->eof) 214 return 0; 215 216 for (pos = 0; len > 0; pos += l, len -= l) { 217 /* empty buffer */ 218 if (!c->buf || c->b_pos == c->b_len) 219 if (_http_fillbuf(c) < 1) 220 break; 221 l = c->b_len - c->b_pos; 222 if (len < l) 223 l = len; 224 bcopy(c->buf + c->b_pos, buf + pos, l); 225 c->b_pos += l; 226 } 227 228 if (!pos && c->error) 229 return -1; 230 return pos; 231 } 232 233 /* 234 * Write function 235 */ 236 static int 237 _http_writefn(void *v, const char *buf, int len) 238 { 239 struct cookie *c = (struct cookie *)v; 240 241 return write(c->fd, buf, len); 242 } 243 244 /* 245 * Close function 246 */ 247 static int 248 _http_closefn(void *v) 249 { 250 struct cookie *c = (struct cookie *)v; 251 int r; 252 253 r = close(c->fd); 254 if (c->buf) 255 free(c->buf); 256 free(c); 257 return r; 258 } 259 260 /* 261 * Wrap a file descriptor up 262 */ 263 static FILE * 264 _http_funopen(int fd) 265 { 266 struct cookie *c; 267 FILE *f; 268 269 if ((c = calloc(1, sizeof *c)) == NULL) { 270 _fetch_syserr(); 271 return NULL; 272 } 273 c->fd = fd; 274 if (!(f = funopen(c, _http_readfn, _http_writefn, NULL, _http_closefn))) { 275 _fetch_syserr(); 276 free(c); 277 return NULL; 278 } 279 return f; 280 } 281 282 283 /***************************************************************************** 284 * Helper functions for talking to the server and parsing its replies 285 */ 286 287 /* Header types */ 288 typedef enum { 289 hdr_syserror = -2, 290 hdr_error = -1, 291 hdr_end = 0, 292 hdr_unknown = 1, 293 hdr_content_length, 294 hdr_content_range, 295 hdr_last_modified, 296 hdr_location, 297 hdr_transfer_encoding 298 } hdr; 299 300 /* Names of interesting headers */ 301 static struct { 302 hdr num; 303 char *name; 304 } hdr_names[] = { 305 { hdr_content_length, "Content-Length" }, 306 { hdr_content_range, "Content-Range" }, 307 { hdr_last_modified, "Last-Modified" }, 308 { hdr_location, "Location" }, 309 { hdr_transfer_encoding, "Transfer-Encoding" }, 310 { hdr_unknown, NULL }, 311 }; 312 313 static char *reply_buf; 314 static size_t reply_size; 315 static size_t reply_length; 316 317 /* 318 * Send a formatted line; optionally echo to terminal 319 */ 320 static int 321 _http_cmd(int fd, char *fmt, ...) 322 { 323 va_list ap; 324 size_t len; 325 char *msg; 326 int r; 327 328 va_start(ap, fmt); 329 len = vasprintf(&msg, fmt, ap); 330 va_end(ap); 331 332 if (msg == NULL) { 333 errno = ENOMEM; 334 _fetch_syserr(); 335 return -1; 336 } 337 338 r = _fetch_putln(fd, msg, len); 339 free(msg); 340 341 if (r == -1) { 342 _fetch_syserr(); 343 return -1; 344 } 345 346 return 0; 347 } 348 349 /* 350 * Get and parse status line 351 */ 352 static int 353 _http_get_reply(int fd) 354 { 355 char *p; 356 357 if (_fetch_getln(fd, &reply_buf, &reply_size, &reply_length) == -1) 358 return -1; 359 /* 360 * A valid status line looks like "HTTP/m.n xyz reason" where m 361 * and n are the major and minor protocol version numbers and xyz 362 * is the reply code. 363 * Unfortunately, there are servers out there (NCSA 1.5.1, to name 364 * just one) that do not send a version number, so we can't rely 365 * on finding one, but if we do, insist on it being 1.0 or 1.1. 366 * We don't care about the reason phrase. 367 */ 368 if (strncmp(reply_buf, "HTTP", 4) != 0) 369 return HTTP_PROTOCOL_ERROR; 370 p = reply_buf + 4; 371 if (*p == '/') { 372 if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1')) 373 return HTTP_PROTOCOL_ERROR; 374 p += 4; 375 } 376 if (*p != ' ' 377 || !isdigit(p[1]) 378 || !isdigit(p[2]) 379 || !isdigit(p[3])) 380 return HTTP_PROTOCOL_ERROR; 381 382 return ((p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0')); 383 } 384 385 /* 386 * Check a header; if the type matches the given string, return a 387 * pointer to the beginning of the value. 388 */ 389 static char * 390 _http_match(char *str, char *hdr) 391 { 392 while (*str && *hdr && tolower(*str++) == tolower(*hdr++)) 393 /* nothing */; 394 if (*str || *hdr != ':') 395 return NULL; 396 while (*hdr && isspace(*++hdr)) 397 /* nothing */; 398 return hdr; 399 } 400 401 /* 402 * Get the next header and return the appropriate symbolic code. 403 */ 404 static hdr 405 _http_next_header(int fd, char **p) 406 { 407 int i; 408 409 if (_fetch_getln(fd, &reply_buf, &reply_size, &reply_length) == -1) 410 return hdr_syserror; 411 while (reply_length && isspace(reply_buf[reply_length-1])) 412 reply_length--; 413 reply_buf[reply_length] = 0; 414 if (reply_length == 0) 415 return hdr_end; 416 /* 417 * We could check for malformed headers but we don't really care. 418 * A valid header starts with a token immediately followed by a 419 * colon; a token is any sequence of non-control, non-whitespace 420 * characters except "()<>@,;:\\\"{}". 421 */ 422 for (i = 0; hdr_names[i].num != hdr_unknown; i++) 423 if ((*p = _http_match(hdr_names[i].name, reply_buf)) != NULL) 424 return hdr_names[i].num; 425 return hdr_unknown; 426 } 427 428 /* 429 * Parse a last-modified header 430 */ 431 static int 432 _http_parse_mtime(char *p, time_t *mtime) 433 { 434 char locale[64], *r; 435 struct tm tm; 436 437 strncpy(locale, setlocale(LC_TIME, NULL), sizeof locale); 438 setlocale(LC_TIME, "C"); 439 r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm); 440 /* XXX should add support for date-2 and date-3 */ 441 setlocale(LC_TIME, locale); 442 if (r == NULL) 443 return -1; 444 DEBUG(fprintf(stderr, "last modified: [\033[1m%04d-%02d-%02d " 445 "%02d:%02d:%02d\033[m]\n", 446 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 447 tm.tm_hour, tm.tm_min, tm.tm_sec)); 448 *mtime = timegm(&tm); 449 return 0; 450 } 451 452 /* 453 * Parse a content-length header 454 */ 455 static int 456 _http_parse_length(char *p, off_t *length) 457 { 458 off_t len; 459 460 for (len = 0; *p && isdigit(*p); ++p) 461 len = len * 10 + (*p - '0'); 462 DEBUG(fprintf(stderr, "content length: [\033[1m%lld\033[m]\n", len)); 463 *length = len; 464 return 0; 465 } 466 467 /* 468 * Parse a content-range header 469 */ 470 static int 471 _http_parse_range(char *p, off_t *offset, off_t *length, off_t *size) 472 { 473 int first, last, len; 474 475 if (strncasecmp(p, "bytes ", 6) != 0) 476 return -1; 477 for (first = 0, p += 6; *p && isdigit(*p); ++p) 478 first = first * 10 + *p - '0'; 479 if (*p != '-') 480 return -1; 481 for (last = 0, ++p; *p && isdigit(*p); ++p) 482 last = last * 10 + *p - '0'; 483 if (first > last || *p != '/') 484 return -1; 485 for (len = 0, ++p; *p && isdigit(*p); ++p) 486 len = len * 10 + *p - '0'; 487 if (len < last - first + 1) 488 return -1; 489 DEBUG(fprintf(stderr, "content range: [\033[1m%d-%d/%d\033[m]\n", 490 first, last, len)); 491 *offset = first; 492 *length = last - first + 1; 493 *size = len; 494 return 0; 495 } 496 497 498 /***************************************************************************** 499 * Helper functions for authorization 500 */ 501 502 /* 503 * Base64 encoding 504 */ 505 static char * 506 _http_base64(char *src) 507 { 508 static const char base64[] = 509 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 510 "abcdefghijklmnopqrstuvwxyz" 511 "0123456789+/"; 512 char *str, *dst; 513 size_t l; 514 int t, r; 515 516 l = strlen(src); 517 if ((str = malloc(((l + 2) / 3) * 4)) == NULL) 518 return NULL; 519 dst = str; 520 r = 0; 521 522 while (l >= 3) { 523 t = (src[0] << 16) | (src[1] << 8) | src[2]; 524 dst[0] = base64[(t >> 18) & 0x3f]; 525 dst[1] = base64[(t >> 12) & 0x3f]; 526 dst[2] = base64[(t >> 6) & 0x3f]; 527 dst[3] = base64[(t >> 0) & 0x3f]; 528 src += 3; l -= 3; 529 dst += 4; r += 4; 530 } 531 532 switch (l) { 533 case 2: 534 t = (src[0] << 16) | (src[1] << 8); 535 dst[0] = base64[(t >> 18) & 0x3f]; 536 dst[1] = base64[(t >> 12) & 0x3f]; 537 dst[2] = base64[(t >> 6) & 0x3f]; 538 dst[3] = '='; 539 dst += 4; 540 r += 4; 541 break; 542 case 1: 543 t = src[0] << 16; 544 dst[0] = base64[(t >> 18) & 0x3f]; 545 dst[1] = base64[(t >> 12) & 0x3f]; 546 dst[2] = dst[3] = '='; 547 dst += 4; 548 r += 4; 549 break; 550 case 0: 551 break; 552 } 553 554 *dst = 0; 555 return str; 556 } 557 558 /* 559 * Encode username and password 560 */ 561 static int 562 _http_basic_auth(int fd, char *hdr, char *usr, char *pwd) 563 { 564 char *upw, *auth; 565 int r; 566 567 if (asprintf(&upw, "%s:%s", usr, pwd) == -1) 568 return -1; 569 auth = _http_base64(upw); 570 free(upw); 571 if (auth == NULL) 572 return -1; 573 r = _http_cmd(fd, "%s: Basic %s", hdr, auth); 574 free(auth); 575 return r; 576 } 577 578 /* 579 * Send an authorization header 580 */ 581 static int 582 _http_authorize(int fd, char *hdr, char *p) 583 { 584 /* basic authorization */ 585 if (strncasecmp(p, "basic:", 6) == 0) { 586 char *user, *pwd, *str; 587 int r; 588 589 /* skip realm */ 590 for (p += 6; *p && *p != ':'; ++p) 591 /* nothing */ ; 592 if (!*p || strchr(++p, ':') == NULL) 593 return -1; 594 if ((str = strdup(p)) == NULL) 595 return -1; /* XXX */ 596 user = str; 597 pwd = strchr(str, ':'); 598 *pwd++ = '\0'; 599 r = _http_basic_auth(fd, hdr, user, pwd); 600 free(str); 601 return r; 602 } 603 return -1; 604 } 605 606 607 /***************************************************************************** 608 * Helper functions for connecting to a server or proxy 609 */ 610 611 /* 612 * Connect to the correct HTTP server or proxy. 613 */ 614 static int 615 _http_connect(struct url *URL, struct url *purl, char *flags) 616 { 617 int verbose; 618 int af, fd; 619 620 #ifdef INET6 621 af = AF_UNSPEC; 622 #else 623 af = AF_INET; 624 #endif 625 626 verbose = CHECK_FLAG('v'); 627 if (CHECK_FLAG('4')) 628 af = AF_INET; 629 #ifdef INET6 630 else if (CHECK_FLAG('6')) 631 af = AF_INET6; 632 #endif 633 634 if (purl) { 635 URL = purl; 636 } else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) { 637 /* can't talk http to an ftp server */ 638 /* XXX should set an error code */ 639 return -1; 640 } 641 642 if ((fd = _fetch_connect(URL->host, URL->port, af, verbose)) == -1) 643 /* _fetch_connect() has already set an error code */ 644 return -1; 645 return fd; 646 } 647 648 static struct url * 649 _http_get_proxy() 650 { 651 struct url *purl; 652 char *p; 653 654 if ((p = getenv("HTTP_PROXY")) && (purl = fetchParseURL(p))) { 655 if (!*purl->scheme) 656 strcpy(purl->scheme, SCHEME_HTTP); 657 if (!purl->port) 658 purl->port = _fetch_default_proxy_port(purl->scheme); 659 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 660 return purl; 661 fetchFreeURL(purl); 662 } 663 return NULL; 664 } 665 666 667 /***************************************************************************** 668 * Core 669 */ 670 671 /* 672 * Send a request and process the reply 673 */ 674 FILE * 675 _http_request(struct url *URL, char *op, struct url_stat *us, 676 struct url *purl, char *flags) 677 { 678 struct url *url, *new; 679 int chunked, direct, need_auth, noredirect, verbose; 680 int code, fd, i, n; 681 off_t offset, clength, length, size; 682 time_t mtime; 683 char *p; 684 FILE *f; 685 hdr h; 686 char *host; 687 #ifdef INET6 688 char hbuf[MAXHOSTNAMELEN + 1]; 689 #endif 690 691 direct = CHECK_FLAG('d'); 692 noredirect = CHECK_FLAG('A'); 693 verbose = CHECK_FLAG('v'); 694 695 if (direct && purl) { 696 fetchFreeURL(purl); 697 purl = NULL; 698 } 699 700 /* try the provided URL first */ 701 url = URL; 702 703 /* if the A flag is set, we only get one try */ 704 n = noredirect ? 1 : MAX_REDIRECT; 705 i = 0; 706 707 do { 708 new = NULL; 709 chunked = 0; 710 need_auth = 0; 711 offset = 0; 712 clength = -1; 713 length = -1; 714 size = -1; 715 mtime = 0; 716 retry: 717 /* check port */ 718 if (!url->port) 719 url->port = _fetch_default_port(url->scheme); 720 721 /* connect to server or proxy */ 722 if ((fd = _http_connect(url, purl, flags)) == -1) 723 goto ouch; 724 725 host = url->host; 726 #ifdef INET6 727 if (strchr(url->host, ':')) { 728 snprintf(hbuf, sizeof(hbuf), "[%s]", url->host); 729 host = hbuf; 730 } 731 #endif 732 733 /* send request */ 734 if (verbose) 735 _fetch_info("requesting %s://%s:%d%s", 736 url->scheme, host, url->port, url->doc); 737 if (purl) { 738 _http_cmd(fd, "%s %s://%s:%d%s HTTP/1.1", 739 op, url->scheme, host, url->port, url->doc); 740 } else { 741 _http_cmd(fd, "%s %s HTTP/1.1", 742 op, url->doc); 743 } 744 745 /* proxy authorization */ 746 if (purl) { 747 if (*purl->user || *purl->pwd) 748 _http_basic_auth(fd, "Proxy-Authorization", 749 purl->user, purl->pwd); 750 else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL && *p != '\0') 751 _http_authorize(fd, "Proxy-Authorization", p); 752 } 753 754 /* server authorization */ 755 if (need_auth) { 756 if (*url->user || *url->pwd) 757 _http_basic_auth(fd, "Authorization", url->user, url->pwd); 758 else if ((p = getenv("HTTP_AUTH")) != NULL && *p != '\0') 759 _http_authorize(fd, "Authorization", p); 760 else { 761 _http_seterr(HTTP_NEED_AUTH); 762 goto ouch; 763 } 764 } 765 766 /* other headers */ 767 if (url->port == _fetch_default_port(url->scheme)) 768 _http_cmd(fd, "Host: %s", host); 769 else 770 _http_cmd(fd, "Host: %s:%d", host, url->port); 771 _http_cmd(fd, "User-Agent: %s " _LIBFETCH_VER, __progname); 772 if (url->offset) 773 _http_cmd(fd, "Range: bytes=%lld-", url->offset); 774 _http_cmd(fd, "Connection: close"); 775 _http_cmd(fd, ""); 776 777 /* get reply */ 778 switch ((code = _http_get_reply(fd))) { 779 case HTTP_OK: 780 case HTTP_PARTIAL: 781 /* fine */ 782 break; 783 case HTTP_MOVED_PERM: 784 case HTTP_MOVED_TEMP: 785 /* 786 * Not so fine, but we still have to read the headers to 787 * get the new location. 788 */ 789 break; 790 case HTTP_NEED_AUTH: 791 if (need_auth) { 792 /* 793 * We already sent out authorization code, so there's 794 * nothing more we can do. 795 */ 796 _http_seterr(code); 797 goto ouch; 798 } 799 /* try again, but send the password this time */ 800 if (verbose) 801 _fetch_info("server requires authorization"); 802 need_auth = 1; 803 close(fd); 804 goto retry; 805 case HTTP_NEED_PROXY_AUTH: 806 /* 807 * If we're talking to a proxy, we already sent our proxy 808 * authorization code, so there's nothing more we can do. 809 */ 810 _http_seterr(code); 811 goto ouch; 812 case HTTP_PROTOCOL_ERROR: 813 /* fall through */ 814 case -1: 815 _fetch_syserr(); 816 goto ouch; 817 default: 818 _http_seterr(code); 819 goto ouch; 820 } 821 822 /* get headers */ 823 do { 824 switch ((h = _http_next_header(fd, &p))) { 825 case hdr_syserror: 826 _fetch_syserr(); 827 goto ouch; 828 case hdr_error: 829 _http_seterr(HTTP_PROTOCOL_ERROR); 830 goto ouch; 831 case hdr_content_length: 832 _http_parse_length(p, &clength); 833 break; 834 case hdr_content_range: 835 _http_parse_range(p, &offset, &length, &size); 836 break; 837 case hdr_last_modified: 838 _http_parse_mtime(p, &mtime); 839 break; 840 case hdr_location: 841 if (!HTTP_REDIRECT(code)) 842 break; 843 if (new) 844 free(new); 845 if (verbose) 846 _fetch_info("%d redirect to %s", code, p); 847 if (*p == '/') 848 /* absolute path */ 849 new = fetchMakeURL(url->scheme, url->host, url->port, p, 850 url->user, url->pwd); 851 else 852 new = fetchParseURL(p); 853 if (new == NULL) { 854 /* XXX should set an error code */ 855 DEBUG(fprintf(stderr, "failed to parse new URL\n")); 856 goto ouch; 857 } 858 if (!*new->user && !*new->pwd) { 859 strcpy(new->user, url->user); 860 strcpy(new->pwd, url->pwd); 861 } 862 new->offset = url->offset; 863 new->length = url->length; 864 break; 865 case hdr_transfer_encoding: 866 /* XXX weak test*/ 867 chunked = (strcasecmp(p, "chunked") == 0); 868 break; 869 case hdr_end: 870 /* fall through */ 871 case hdr_unknown: 872 /* ignore */ 873 break; 874 } 875 } while (h > hdr_end); 876 877 /* we either have a hit, or a redirect with no Location: header */ 878 if (code == HTTP_OK || code == HTTP_PARTIAL || !new) 879 break; 880 881 /* we have a redirect */ 882 close(fd); 883 fd = -1; 884 if (url != URL) 885 fetchFreeURL(url); 886 url = new; 887 } while (++i < n); 888 889 /* no success */ 890 if (fd == -1) { 891 _http_seterr(code); 892 goto ouch; 893 } 894 895 DEBUG(fprintf(stderr, "offset %lld, length %lld, size %lld, clength %lld\n", 896 offset, length, size, clength)); 897 898 /* check for inconsistencies */ 899 if (clength != -1 && length != -1 && clength != length) { 900 _http_seterr(HTTP_PROTOCOL_ERROR); 901 goto ouch; 902 } 903 if (clength == -1) 904 clength = length; 905 if (clength != -1) 906 length = offset + clength; 907 if (length != -1 && size != -1 && length != size) { 908 _http_seterr(HTTP_PROTOCOL_ERROR); 909 goto ouch; 910 } 911 if (size == -1) 912 size = length; 913 914 /* fill in stats */ 915 if (us) { 916 us->size = size; 917 us->atime = us->mtime = mtime; 918 } 919 920 /* too far? */ 921 if (offset > URL->offset) { 922 _http_seterr(HTTP_PROTOCOL_ERROR); 923 goto ouch; 924 } 925 926 /* report back real offset and size */ 927 URL->offset = offset; 928 URL->length = clength; 929 930 /* wrap it up in a FILE */ 931 if ((f = chunked ? _http_funopen(fd) : fdopen(fd, "r")) == NULL) { 932 _fetch_syserr(); 933 goto ouch; 934 } 935 936 if (url != URL) 937 fetchFreeURL(url); 938 if (purl) 939 fetchFreeURL(purl); 940 941 return f; 942 943 ouch: 944 if (url != URL) 945 fetchFreeURL(url); 946 if (purl) 947 fetchFreeURL(purl); 948 if (fd != -1) 949 close(fd); 950 return NULL; 951 } 952 953 954 /***************************************************************************** 955 * Entry points 956 */ 957 958 /* 959 * Retrieve and stat a file by HTTP 960 */ 961 FILE * 962 fetchXGetHTTP(struct url *URL, struct url_stat *us, char *flags) 963 { 964 return _http_request(URL, "GET", us, _http_get_proxy(), flags); 965 } 966 967 /* 968 * Retrieve a file by HTTP 969 */ 970 FILE * 971 fetchGetHTTP(struct url *URL, char *flags) 972 { 973 return fetchXGetHTTP(URL, NULL, flags); 974 } 975 976 /* 977 * Store a file by HTTP 978 */ 979 FILE * 980 fetchPutHTTP(struct url *URL, char *flags) 981 { 982 warnx("fetchPutHTTP(): not implemented"); 983 return NULL; 984 } 985 986 /* 987 * Get an HTTP document's metadata 988 */ 989 int 990 fetchStatHTTP(struct url *URL, struct url_stat *us, char *flags) 991 { 992 FILE *f; 993 994 if ((f = _http_request(URL, "HEAD", us, _http_get_proxy(), flags)) == NULL) 995 return -1; 996 fclose(f); 997 return 0; 998 } 999 1000 /* 1001 * List a directory 1002 */ 1003 struct url_ent * 1004 fetchListHTTP(struct url *url, char *flags) 1005 { 1006 warnx("fetchListHTTP(): not implemented"); 1007 return NULL; 1008 } 1009