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 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 /* 33 * The following copyright applies to the base64 code: 34 * 35 *- 36 * Copyright 1997 Massachusetts Institute of Technology 37 * 38 * Permission to use, copy, modify, and distribute this software and 39 * its documentation for any purpose and without fee is hereby 40 * granted, provided that both the above copyright notice and this 41 * permission notice appear in all copies, that both the above 42 * copyright notice and this permission notice appear in all 43 * supporting documentation, and that the name of M.I.T. not be used 44 * in advertising or publicity pertaining to distribution of the 45 * software without specific, written prior permission. M.I.T. makes 46 * no representations about the suitability of this software for any 47 * purpose. It is provided "as is" without express or implied 48 * warranty. 49 * 50 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 51 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 52 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 53 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 54 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 55 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 56 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 57 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 58 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 59 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 60 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 61 * SUCH DAMAGE. 62 */ 63 64 #include <sys/param.h> 65 #include <sys/socket.h> 66 67 #include <ctype.h> 68 #include <err.h> 69 #include <errno.h> 70 #include <locale.h> 71 #include <netdb.h> 72 #include <stdarg.h> 73 #include <stdio.h> 74 #include <stdlib.h> 75 #include <string.h> 76 #include <time.h> 77 #include <unistd.h> 78 79 #include "fetch.h" 80 #include "common.h" 81 #include "httperr.h" 82 83 /* Maximum number of redirects to follow */ 84 #define MAX_REDIRECT 5 85 86 /* Symbolic names for reply codes we care about */ 87 #define HTTP_OK 200 88 #define HTTP_PARTIAL 206 89 #define HTTP_MOVED_PERM 301 90 #define HTTP_MOVED_TEMP 302 91 #define HTTP_SEE_OTHER 303 92 #define HTTP_NEED_AUTH 401 93 #define HTTP_NEED_PROXY_AUTH 407 94 #define HTTP_PROTOCOL_ERROR 999 95 96 #define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \ 97 || (xyz) == HTTP_MOVED_TEMP \ 98 || (xyz) == HTTP_SEE_OTHER) 99 100 #define HTTP_ERROR(xyz) ((xyz) > 400 && (xyz) < 599) 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 ssize_t b_len; 113 int b_pos; 114 int eof; 115 int error; 116 size_t chunksize; 117 #ifndef NDEBUG 118 size_t 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 < c->buf + c->b_len; ++p) { 137 if (*p == ';') 138 break; 139 if (!ishexnumber(*p)) 140 return (-1); 141 if (isdigit(*p)) { 142 c->chunksize = c->chunksize * 16 + 143 *p - '0'; 144 } else { 145 c->chunksize = c->chunksize * 16 + 146 10 + tolower(*p) - 'a'; 147 } 148 } 149 150 #ifndef NDEBUG 151 if (fetchDebug) { 152 c->total += c->chunksize; 153 if (c->chunksize == 0) 154 fprintf(stderr, "_http_fillbuf(): " 155 "end of last chunk\n"); 156 else 157 fprintf(stderr, "_http_fillbuf(): " 158 "new chunk: %lu (%lu)\n", 159 (unsigned long)c->chunksize, (unsigned long)c->total); 160 } 161 #endif 162 163 return (c->chunksize); 164 } 165 166 /* 167 * Fill the input buffer, do chunk decoding on the fly 168 */ 169 static int 170 _http_fillbuf(struct cookie *c) 171 { 172 if (c->error) 173 return (-1); 174 if (c->eof) 175 return (0); 176 177 if (c->chunksize == 0) { 178 switch (_http_new_chunk(c)) { 179 case -1: 180 c->error = 1; 181 return (-1); 182 case 0: 183 c->eof = 1; 184 return (0); 185 } 186 } 187 188 if (c->b_size < c->chunksize) { 189 char *tmp; 190 191 if ((tmp = realloc(c->buf, c->chunksize)) == NULL) 192 return (-1); 193 c->buf = tmp; 194 c->b_size = c->chunksize; 195 } 196 197 if ((c->b_len = read(c->fd, c->buf, c->chunksize)) == -1) 198 return (-1); 199 c->chunksize -= c->b_len; 200 201 if (c->chunksize == 0) { 202 char endl; 203 if (read(c->fd, &endl, 1) == -1 || 204 read(c->fd, &endl, 1) == -1) 205 return (-1); 206 } 207 208 c->b_pos = 0; 209 210 return (c->b_len); 211 } 212 213 /* 214 * Read function 215 */ 216 static int 217 _http_readfn(void *v, char *buf, int len) 218 { 219 struct cookie *c = (struct cookie *)v; 220 int l, pos; 221 222 if (c->error) 223 return (-1); 224 if (c->eof) 225 return (0); 226 227 for (pos = 0; len > 0; pos += l, len -= l) { 228 /* empty buffer */ 229 if (!c->buf || c->b_pos == c->b_len) 230 if (_http_fillbuf(c) < 1) 231 break; 232 l = c->b_len - c->b_pos; 233 if (len < l) 234 l = len; 235 bcopy(c->buf + c->b_pos, buf + pos, l); 236 c->b_pos += l; 237 } 238 239 if (!pos && c->error) 240 return (-1); 241 return (pos); 242 } 243 244 /* 245 * Write function 246 */ 247 static int 248 _http_writefn(void *v, const char *buf, int len) 249 { 250 struct cookie *c = (struct cookie *)v; 251 252 return (write(c->fd, buf, len)); 253 } 254 255 /* 256 * Close function 257 */ 258 static int 259 _http_closefn(void *v) 260 { 261 struct cookie *c = (struct cookie *)v; 262 int r; 263 264 r = close(c->fd); 265 if (c->buf) 266 free(c->buf); 267 free(c); 268 return (r); 269 } 270 271 /* 272 * Wrap a file descriptor up 273 */ 274 static FILE * 275 _http_funopen(int fd) 276 { 277 struct cookie *c; 278 FILE *f; 279 280 if ((c = calloc(1, sizeof *c)) == NULL) { 281 _fetch_syserr(); 282 return (NULL); 283 } 284 c->fd = fd; 285 f = funopen(c, _http_readfn, _http_writefn, NULL, _http_closefn); 286 if (f == NULL) { 287 _fetch_syserr(); 288 free(c); 289 return (NULL); 290 } 291 return (f); 292 } 293 294 295 /***************************************************************************** 296 * Helper functions for talking to the server and parsing its replies 297 */ 298 299 /* Header types */ 300 typedef enum { 301 hdr_syserror = -2, 302 hdr_error = -1, 303 hdr_end = 0, 304 hdr_unknown = 1, 305 hdr_content_length, 306 hdr_content_range, 307 hdr_last_modified, 308 hdr_location, 309 hdr_transfer_encoding, 310 hdr_www_authenticate 311 } hdr_t; 312 313 /* Names of interesting headers */ 314 static struct { 315 hdr_t num; 316 const char *name; 317 } hdr_names[] = { 318 { hdr_content_length, "Content-Length" }, 319 { hdr_content_range, "Content-Range" }, 320 { hdr_last_modified, "Last-Modified" }, 321 { hdr_location, "Location" }, 322 { hdr_transfer_encoding, "Transfer-Encoding" }, 323 { hdr_www_authenticate, "WWW-Authenticate" }, 324 { hdr_unknown, NULL }, 325 }; 326 327 static char *reply_buf; 328 static size_t reply_size; 329 static size_t reply_length; 330 331 /* 332 * Send a formatted line; optionally echo to terminal 333 */ 334 static int 335 _http_cmd(int fd, const char *fmt, ...) 336 { 337 va_list ap; 338 size_t len; 339 char *msg; 340 int r; 341 342 va_start(ap, fmt); 343 len = vasprintf(&msg, fmt, ap); 344 va_end(ap); 345 346 if (msg == NULL) { 347 errno = ENOMEM; 348 _fetch_syserr(); 349 return (-1); 350 } 351 352 r = _fetch_putln(fd, msg, len); 353 free(msg); 354 355 if (r == -1) { 356 _fetch_syserr(); 357 return (-1); 358 } 359 360 return (0); 361 } 362 363 /* 364 * Get and parse status line 365 */ 366 static int 367 _http_get_reply(int fd) 368 { 369 char *p; 370 371 if (_fetch_getln(fd, &reply_buf, &reply_size, &reply_length) == -1) 372 return (-1); 373 /* 374 * A valid status line looks like "HTTP/m.n xyz reason" where m 375 * and n are the major and minor protocol version numbers and xyz 376 * is the reply code. 377 * Unfortunately, there are servers out there (NCSA 1.5.1, to name 378 * just one) that do not send a version number, so we can't rely 379 * on finding one, but if we do, insist on it being 1.0 or 1.1. 380 * We don't care about the reason phrase. 381 */ 382 if (strncmp(reply_buf, "HTTP", 4) != 0) 383 return (HTTP_PROTOCOL_ERROR); 384 p = reply_buf + 4; 385 if (*p == '/') { 386 if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1')) 387 return (HTTP_PROTOCOL_ERROR); 388 p += 4; 389 } 390 if (*p != ' ' || !isdigit(p[1]) || !isdigit(p[2]) || !isdigit(p[3])) 391 return (HTTP_PROTOCOL_ERROR); 392 393 return ((p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0')); 394 } 395 396 /* 397 * Check a header; if the type matches the given string, return a pointer 398 * to the beginning of the value. 399 */ 400 static const char * 401 _http_match(const char *str, const char *hdr) 402 { 403 while (*str && *hdr && tolower(*str++) == tolower(*hdr++)) 404 /* nothing */; 405 if (*str || *hdr != ':') 406 return (NULL); 407 while (*hdr && isspace(*++hdr)) 408 /* nothing */; 409 return (hdr); 410 } 411 412 /* 413 * Get the next header and return the appropriate symbolic code. 414 */ 415 static hdr_t 416 _http_next_header(int fd, const char **p) 417 { 418 int i; 419 420 if (_fetch_getln(fd, &reply_buf, &reply_size, &reply_length) == -1) 421 return (hdr_syserror); 422 while (reply_length && isspace(reply_buf[reply_length-1])) 423 reply_length--; 424 reply_buf[reply_length] = 0; 425 if (reply_length == 0) 426 return (hdr_end); 427 /* 428 * We could check for malformed headers but we don't really care. 429 * A valid header starts with a token immediately followed by a 430 * colon; a token is any sequence of non-control, non-whitespace 431 * characters except "()<>@,;:\\\"{}". 432 */ 433 for (i = 0; hdr_names[i].num != hdr_unknown; i++) 434 if ((*p = _http_match(hdr_names[i].name, reply_buf)) != NULL) 435 return (hdr_names[i].num); 436 return (hdr_unknown); 437 } 438 439 /* 440 * Parse a last-modified header 441 */ 442 static int 443 _http_parse_mtime(const char *p, time_t *mtime) 444 { 445 char locale[64], *r; 446 struct tm tm; 447 448 strncpy(locale, setlocale(LC_TIME, NULL), sizeof locale); 449 setlocale(LC_TIME, "C"); 450 r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm); 451 /* XXX should add support for date-2 and date-3 */ 452 setlocale(LC_TIME, locale); 453 if (r == NULL) 454 return (-1); 455 DEBUG(fprintf(stderr, "last modified: [%04d-%02d-%02d " 456 "%02d:%02d:%02d]\n", 457 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 458 tm.tm_hour, tm.tm_min, tm.tm_sec)); 459 *mtime = timegm(&tm); 460 return (0); 461 } 462 463 /* 464 * Parse a content-length header 465 */ 466 static int 467 _http_parse_length(const char *p, off_t *length) 468 { 469 off_t len; 470 471 for (len = 0; *p && isdigit(*p); ++p) 472 len = len * 10 + (*p - '0'); 473 if (*p) 474 return (-1); 475 DEBUG(fprintf(stderr, "content length: [%lld]\n", 476 (long long)len)); 477 *length = len; 478 return (0); 479 } 480 481 /* 482 * Parse a content-range header 483 */ 484 static int 485 _http_parse_range(const char *p, off_t *offset, off_t *length, off_t *size) 486 { 487 off_t first, last, len; 488 489 if (strncasecmp(p, "bytes ", 6) != 0) 490 return (-1); 491 for (first = 0, p += 6; *p && isdigit(*p); ++p) 492 first = first * 10 + *p - '0'; 493 if (*p != '-') 494 return (-1); 495 for (last = 0, ++p; *p && isdigit(*p); ++p) 496 last = last * 10 + *p - '0'; 497 if (first > last || *p != '/') 498 return (-1); 499 for (len = 0, ++p; *p && isdigit(*p); ++p) 500 len = len * 10 + *p - '0'; 501 if (*p || len < last - first + 1) 502 return (-1); 503 DEBUG(fprintf(stderr, "content range: [%lld-%lld/%lld]\n", 504 (long long)first, (long long)last, (long long)len)); 505 *offset = first; 506 *length = last - first + 1; 507 *size = len; 508 return (0); 509 } 510 511 512 /***************************************************************************** 513 * Helper functions for authorization 514 */ 515 516 /* 517 * Base64 encoding 518 */ 519 static char * 520 _http_base64(const char *src) 521 { 522 static const char base64[] = 523 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 524 "abcdefghijklmnopqrstuvwxyz" 525 "0123456789+/"; 526 char *str, *dst; 527 size_t l; 528 int t, r; 529 530 l = strlen(src); 531 if ((str = malloc(((l + 2) / 3) * 4)) == NULL) 532 return (NULL); 533 dst = str; 534 r = 0; 535 536 while (l >= 3) { 537 t = (src[0] << 16) | (src[1] << 8) | src[2]; 538 dst[0] = base64[(t >> 18) & 0x3f]; 539 dst[1] = base64[(t >> 12) & 0x3f]; 540 dst[2] = base64[(t >> 6) & 0x3f]; 541 dst[3] = base64[(t >> 0) & 0x3f]; 542 src += 3; l -= 3; 543 dst += 4; r += 4; 544 } 545 546 switch (l) { 547 case 2: 548 t = (src[0] << 16) | (src[1] << 8); 549 dst[0] = base64[(t >> 18) & 0x3f]; 550 dst[1] = base64[(t >> 12) & 0x3f]; 551 dst[2] = base64[(t >> 6) & 0x3f]; 552 dst[3] = '='; 553 dst += 4; 554 r += 4; 555 break; 556 case 1: 557 t = src[0] << 16; 558 dst[0] = base64[(t >> 18) & 0x3f]; 559 dst[1] = base64[(t >> 12) & 0x3f]; 560 dst[2] = dst[3] = '='; 561 dst += 4; 562 r += 4; 563 break; 564 case 0: 565 break; 566 } 567 568 *dst = 0; 569 return (str); 570 } 571 572 /* 573 * Encode username and password 574 */ 575 static int 576 _http_basic_auth(int fd, const char *hdr, const char *usr, const char *pwd) 577 { 578 char *upw, *auth; 579 int r; 580 581 DEBUG(fprintf(stderr, "usr: [%s]\n", usr)); 582 DEBUG(fprintf(stderr, "pwd: [%s]\n", pwd)); 583 if (asprintf(&upw, "%s:%s", usr, pwd) == -1) 584 return (-1); 585 auth = _http_base64(upw); 586 free(upw); 587 if (auth == NULL) 588 return (-1); 589 r = _http_cmd(fd, "%s: Basic %s", hdr, auth); 590 free(auth); 591 return (r); 592 } 593 594 /* 595 * Send an authorization header 596 */ 597 static int 598 _http_authorize(int fd, const char *hdr, const char *p) 599 { 600 /* basic authorization */ 601 if (strncasecmp(p, "basic:", 6) == 0) { 602 char *user, *pwd, *str; 603 int r; 604 605 /* skip realm */ 606 for (p += 6; *p && *p != ':'; ++p) 607 /* nothing */ ; 608 if (!*p || strchr(++p, ':') == NULL) 609 return (-1); 610 if ((str = strdup(p)) == NULL) 611 return (-1); /* XXX */ 612 user = str; 613 pwd = strchr(str, ':'); 614 *pwd++ = '\0'; 615 r = _http_basic_auth(fd, hdr, user, pwd); 616 free(str); 617 return (r); 618 } 619 return (-1); 620 } 621 622 623 /***************************************************************************** 624 * Helper functions for connecting to a server or proxy 625 */ 626 627 /* 628 * Connect to the correct HTTP server or proxy. 629 */ 630 static int 631 _http_connect(struct url *URL, struct url *purl, const char *flags) 632 { 633 int verbose; 634 int af, fd; 635 636 #ifdef INET6 637 af = AF_UNSPEC; 638 #else 639 af = AF_INET; 640 #endif 641 642 verbose = CHECK_FLAG('v'); 643 if (CHECK_FLAG('4')) 644 af = AF_INET; 645 #ifdef INET6 646 else if (CHECK_FLAG('6')) 647 af = AF_INET6; 648 #endif 649 650 if (purl) { 651 URL = purl; 652 } else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) { 653 /* can't talk http to an ftp server */ 654 /* XXX should set an error code */ 655 return (-1); 656 } 657 658 if ((fd = _fetch_connect(URL->host, URL->port, af, verbose)) == -1) 659 /* _fetch_connect() has already set an error code */ 660 return (-1); 661 return (fd); 662 } 663 664 static struct url * 665 _http_get_proxy(void) 666 { 667 struct url *purl; 668 char *p; 669 670 if (((p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 671 (purl = fetchParseURL(p))) { 672 if (!*purl->scheme) 673 strcpy(purl->scheme, SCHEME_HTTP); 674 if (!purl->port) 675 purl->port = _fetch_default_proxy_port(purl->scheme); 676 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 677 return (purl); 678 fetchFreeURL(purl); 679 } 680 return (NULL); 681 } 682 683 static void 684 _http_print_html(FILE *out, FILE *in) 685 { 686 size_t len; 687 char *line, *p, *q; 688 int comment, tag; 689 690 comment = tag = 0; 691 while ((line = fgetln(in, &len)) != NULL) { 692 while (len && isspace(line[len - 1])) 693 --len; 694 for (p = q = line; q < line + len; ++q) { 695 if (comment && *q == '-') { 696 if (q + 2 < line + len && 697 strcmp(q, "-->") == 0) { 698 tag = comment = 0; 699 q += 2; 700 } 701 } else if (tag && !comment && *q == '>') { 702 p = q + 1; 703 tag = 0; 704 } else if (!tag && *q == '<') { 705 if (q > p) 706 fwrite(p, q - p, 1, out); 707 tag = 1; 708 if (q + 3 < line + len && 709 strcmp(q, "<!--") == 0) { 710 comment = 1; 711 q += 3; 712 } 713 } 714 } 715 if (!tag && q > p) 716 fwrite(p, q - p, 1, out); 717 fputc('\n', out); 718 } 719 } 720 721 722 /***************************************************************************** 723 * Core 724 */ 725 726 /* 727 * Send a request and process the reply 728 */ 729 FILE * 730 _http_request(struct url *URL, const char *op, struct url_stat *us, 731 struct url *purl, const char *flags) 732 { 733 struct url *url, *new; 734 int chunked, direct, need_auth, noredirect, verbose; 735 int code, fd, i, n; 736 off_t offset, clength, length, size; 737 time_t mtime; 738 const char *p; 739 FILE *f; 740 hdr_t h; 741 char *host; 742 #ifdef INET6 743 char hbuf[MAXHOSTNAMELEN + 1]; 744 #endif 745 746 direct = CHECK_FLAG('d'); 747 noredirect = CHECK_FLAG('A'); 748 verbose = CHECK_FLAG('v'); 749 750 if (direct && purl) { 751 fetchFreeURL(purl); 752 purl = NULL; 753 } 754 755 /* try the provided URL first */ 756 url = URL; 757 758 /* if the A flag is set, we only get one try */ 759 n = noredirect ? 1 : MAX_REDIRECT; 760 i = 0; 761 762 need_auth = 0; 763 do { 764 new = NULL; 765 chunked = 0; 766 offset = 0; 767 clength = -1; 768 length = -1; 769 size = -1; 770 mtime = 0; 771 772 /* check port */ 773 if (!url->port) 774 url->port = _fetch_default_port(url->scheme); 775 776 /* were we redirected to an FTP URL? */ 777 if (purl == NULL && strcmp(url->scheme, SCHEME_FTP) == 0) { 778 if (strcmp(op, "GET") == 0) 779 return (_ftp_request(url, "RETR", us, purl, flags)); 780 else if (strcmp(op, "HEAD") == 0) 781 return (_ftp_request(url, "STAT", us, purl, flags)); 782 } 783 784 /* connect to server or proxy */ 785 if ((fd = _http_connect(url, purl, flags)) == -1) 786 goto ouch; 787 788 host = url->host; 789 #ifdef INET6 790 if (strchr(url->host, ':')) { 791 snprintf(hbuf, sizeof(hbuf), "[%s]", url->host); 792 host = hbuf; 793 } 794 #endif 795 796 /* send request */ 797 if (verbose) 798 _fetch_info("requesting %s://%s:%d%s", 799 url->scheme, host, url->port, url->doc); 800 if (purl) { 801 _http_cmd(fd, "%s %s://%s:%d%s HTTP/1.1", 802 op, url->scheme, host, url->port, url->doc); 803 } else { 804 _http_cmd(fd, "%s %s HTTP/1.1", 805 op, url->doc); 806 } 807 808 /* virtual host */ 809 if (url->port == _fetch_default_port(url->scheme)) 810 _http_cmd(fd, "Host: %s", host); 811 else 812 _http_cmd(fd, "Host: %s:%d", host, url->port); 813 814 /* proxy authorization */ 815 if (purl) { 816 if (*purl->user || *purl->pwd) 817 _http_basic_auth(fd, "Proxy-Authorization", 818 purl->user, purl->pwd); 819 else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL && *p != '\0') 820 _http_authorize(fd, "Proxy-Authorization", p); 821 } 822 823 /* server authorization */ 824 if (need_auth || *url->user || *url->pwd) { 825 if (*url->user || *url->pwd) 826 _http_basic_auth(fd, "Authorization", url->user, url->pwd); 827 else if ((p = getenv("HTTP_AUTH")) != NULL && *p != '\0') 828 _http_authorize(fd, "Authorization", p); 829 else if (fetchAuthMethod && fetchAuthMethod(url) == 0) { 830 _http_basic_auth(fd, "Authorization", url->user, url->pwd); 831 } else { 832 _http_seterr(HTTP_NEED_AUTH); 833 goto ouch; 834 } 835 } 836 837 /* other headers */ 838 if ((p = getenv("HTTP_USER_AGENT")) != NULL && *p != '\0') 839 _http_cmd(fd, "User-Agent: %s", p); 840 else 841 _http_cmd(fd, "User-Agent: %s " _LIBFETCH_VER, _getprogname()); 842 if (url->offset) 843 _http_cmd(fd, "Range: bytes=%lld-", (long long)url->offset); 844 _http_cmd(fd, "Connection: close"); 845 _http_cmd(fd, ""); 846 847 /* get reply */ 848 switch ((code = _http_get_reply(fd))) { 849 case HTTP_OK: 850 case HTTP_PARTIAL: 851 /* fine */ 852 break; 853 case HTTP_MOVED_PERM: 854 case HTTP_MOVED_TEMP: 855 case HTTP_SEE_OTHER: 856 /* 857 * Not so fine, but we still have to read the headers to 858 * get the new location. 859 */ 860 break; 861 case HTTP_NEED_AUTH: 862 if (need_auth) { 863 /* 864 * We already sent out authorization code, so there's 865 * nothing more we can do. 866 */ 867 _http_seterr(code); 868 goto ouch; 869 } 870 /* try again, but send the password this time */ 871 if (verbose) 872 _fetch_info("server requires authorization"); 873 break; 874 case HTTP_NEED_PROXY_AUTH: 875 /* 876 * If we're talking to a proxy, we already sent our proxy 877 * authorization code, so there's nothing more we can do. 878 */ 879 _http_seterr(code); 880 goto ouch; 881 case HTTP_PROTOCOL_ERROR: 882 /* fall through */ 883 case -1: 884 _fetch_syserr(); 885 goto ouch; 886 default: 887 _http_seterr(code); 888 if (!verbose) 889 goto ouch; 890 /* fall through so we can get the full error message */ 891 } 892 893 /* get headers */ 894 do { 895 switch ((h = _http_next_header(fd, &p))) { 896 case hdr_syserror: 897 _fetch_syserr(); 898 goto ouch; 899 case hdr_error: 900 _http_seterr(HTTP_PROTOCOL_ERROR); 901 goto ouch; 902 case hdr_content_length: 903 _http_parse_length(p, &clength); 904 break; 905 case hdr_content_range: 906 _http_parse_range(p, &offset, &length, &size); 907 break; 908 case hdr_last_modified: 909 _http_parse_mtime(p, &mtime); 910 break; 911 case hdr_location: 912 if (!HTTP_REDIRECT(code)) 913 break; 914 if (new) 915 free(new); 916 if (verbose) 917 _fetch_info("%d redirect to %s", code, p); 918 if (*p == '/') 919 /* absolute path */ 920 new = fetchMakeURL(url->scheme, url->host, url->port, p, 921 url->user, url->pwd); 922 else 923 new = fetchParseURL(p); 924 if (new == NULL) { 925 /* XXX should set an error code */ 926 DEBUG(fprintf(stderr, "failed to parse new URL\n")); 927 goto ouch; 928 } 929 if (!*new->user && !*new->pwd) { 930 strcpy(new->user, url->user); 931 strcpy(new->pwd, url->pwd); 932 } 933 new->offset = url->offset; 934 new->length = url->length; 935 break; 936 case hdr_transfer_encoding: 937 /* XXX weak test*/ 938 chunked = (strcasecmp(p, "chunked") == 0); 939 break; 940 case hdr_www_authenticate: 941 if (code != HTTP_NEED_AUTH) 942 break; 943 /* if we were smarter, we'd check the method and realm */ 944 break; 945 case hdr_end: 946 /* fall through */ 947 case hdr_unknown: 948 /* ignore */ 949 break; 950 } 951 } while (h > hdr_end); 952 953 /* we have a hit or an error */ 954 if (code == HTTP_OK || code == HTTP_PARTIAL || HTTP_ERROR(code)) 955 break; 956 957 /* we need to provide authentication */ 958 if (code == HTTP_NEED_AUTH) { 959 need_auth = 1; 960 close(fd); 961 fd = -1; 962 continue; 963 } 964 965 /* all other cases: we got a redirect */ 966 need_auth = 0; 967 close(fd); 968 fd = -1; 969 if (!new) { 970 DEBUG(fprintf(stderr, "redirect with no new location\n")); 971 break; 972 } 973 if (url != URL) 974 fetchFreeURL(url); 975 url = new; 976 } while (++i < n); 977 978 /* we failed, or ran out of retries */ 979 if (fd == -1) { 980 _http_seterr(code); 981 goto ouch; 982 } 983 984 DEBUG(fprintf(stderr, "offset %lld, length %lld," 985 " size %lld, clength %lld\n", 986 (long long)offset, (long long)length, 987 (long long)size, (long long)clength)); 988 989 /* check for inconsistencies */ 990 if (clength != -1 && length != -1 && clength != length) { 991 _http_seterr(HTTP_PROTOCOL_ERROR); 992 goto ouch; 993 } 994 if (clength == -1) 995 clength = length; 996 if (clength != -1) 997 length = offset + clength; 998 if (length != -1 && size != -1 && length != size) { 999 _http_seterr(HTTP_PROTOCOL_ERROR); 1000 goto ouch; 1001 } 1002 if (size == -1) 1003 size = length; 1004 1005 /* fill in stats */ 1006 if (us) { 1007 us->size = size; 1008 us->atime = us->mtime = mtime; 1009 } 1010 1011 /* too far? */ 1012 if (offset > URL->offset) { 1013 _http_seterr(HTTP_PROTOCOL_ERROR); 1014 goto ouch; 1015 } 1016 1017 /* report back real offset and size */ 1018 URL->offset = offset; 1019 URL->length = clength; 1020 1021 /* wrap it up in a FILE */ 1022 if ((f = chunked ? _http_funopen(fd) : fdopen(fd, "r")) == NULL) { 1023 _fetch_syserr(); 1024 goto ouch; 1025 } 1026 1027 if (url != URL) 1028 fetchFreeURL(url); 1029 if (purl) 1030 fetchFreeURL(purl); 1031 1032 if (HTTP_ERROR(code)) { 1033 _http_print_html(stderr, f); 1034 fclose(f); 1035 f = NULL; 1036 } 1037 1038 return (f); 1039 1040 ouch: 1041 if (url != URL) 1042 fetchFreeURL(url); 1043 if (purl) 1044 fetchFreeURL(purl); 1045 if (fd != -1) 1046 close(fd); 1047 return (NULL); 1048 } 1049 1050 1051 /***************************************************************************** 1052 * Entry points 1053 */ 1054 1055 /* 1056 * Retrieve and stat a file by HTTP 1057 */ 1058 FILE * 1059 fetchXGetHTTP(struct url *URL, struct url_stat *us, const char *flags) 1060 { 1061 return (_http_request(URL, "GET", us, _http_get_proxy(), flags)); 1062 } 1063 1064 /* 1065 * Retrieve a file by HTTP 1066 */ 1067 FILE * 1068 fetchGetHTTP(struct url *URL, const char *flags) 1069 { 1070 return (fetchXGetHTTP(URL, NULL, flags)); 1071 } 1072 1073 /* 1074 * Store a file by HTTP 1075 */ 1076 FILE * 1077 fetchPutHTTP(struct url *URL __unused, const char *flags __unused) 1078 { 1079 warnx("fetchPutHTTP(): not implemented"); 1080 return (NULL); 1081 } 1082 1083 /* 1084 * Get an HTTP document's metadata 1085 */ 1086 int 1087 fetchStatHTTP(struct url *URL, struct url_stat *us, const char *flags) 1088 { 1089 FILE *f; 1090 1091 if ((f = _http_request(URL, "HEAD", us, _http_get_proxy(), flags)) == NULL) 1092 return (-1); 1093 fclose(f); 1094 return (0); 1095 } 1096 1097 /* 1098 * List a directory 1099 */ 1100 struct url_ent * 1101 fetchListHTTP(struct url *url __unused, const char *flags __unused) 1102 { 1103 warnx("fetchListHTTP(): not implemented"); 1104 return (NULL); 1105 } 1106