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 extern char *__progname; /* XXX not portable */ 84 85 /* Maximum number of redirects to follow */ 86 #define MAX_REDIRECT 5 87 88 /* Symbolic names for reply codes we care about */ 89 #define HTTP_OK 200 90 #define HTTP_PARTIAL 206 91 #define HTTP_MOVED_PERM 301 92 #define HTTP_MOVED_TEMP 302 93 #define HTTP_SEE_OTHER 303 94 #define HTTP_NEED_AUTH 401 95 #define HTTP_NEED_PROXY_AUTH 407 96 #define HTTP_PROTOCOL_ERROR 999 97 98 #define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \ 99 || (xyz) == HTTP_MOVED_TEMP \ 100 || (xyz) == HTTP_SEE_OTHER) 101 102 #define HTTP_ERROR(xyz) ((xyz) > 400 && (xyz) < 599) 103 104 105 /***************************************************************************** 106 * I/O functions for decoding chunked streams 107 */ 108 109 struct cookie 110 { 111 int fd; 112 char *buf; 113 size_t b_size; 114 ssize_t b_len; 115 int b_pos; 116 int eof; 117 int error; 118 size_t chunksize; 119 #ifndef NDEBUG 120 size_t total; 121 #endif 122 }; 123 124 /* 125 * Get next chunk header 126 */ 127 static int 128 _http_new_chunk(struct cookie *c) 129 { 130 char *p; 131 132 if (_fetch_getln(c->fd, &c->buf, &c->b_size, &c->b_len) == -1) 133 return (-1); 134 135 if (c->b_len < 2 || !ishexnumber(*c->buf)) 136 return (-1); 137 138 for (p = c->buf; !isspace(*p) && p < c->buf + c->b_len; ++p) { 139 if (*p == ';') 140 break; 141 if (!ishexnumber(*p)) 142 return (-1); 143 if (isdigit(*p)) { 144 c->chunksize = c->chunksize * 16 + 145 *p - '0'; 146 } else { 147 c->chunksize = c->chunksize * 16 + 148 10 + tolower(*p) - 'a'; 149 } 150 } 151 152 #ifndef NDEBUG 153 if (fetchDebug) { 154 c->total += c->chunksize; 155 if (c->chunksize == 0) 156 fprintf(stderr, "_http_fillbuf(): " 157 "end of last chunk\n"); 158 else 159 fprintf(stderr, "_http_fillbuf(): " 160 "new chunk: %lu (%lu)\n", 161 (unsigned long)c->chunksize, (unsigned long)c->total); 162 } 163 #endif 164 165 return (c->chunksize); 166 } 167 168 /* 169 * Fill the input buffer, do chunk decoding on the fly 170 */ 171 static int 172 _http_fillbuf(struct cookie *c) 173 { 174 if (c->error) 175 return (-1); 176 if (c->eof) 177 return (0); 178 179 if (c->chunksize == 0) { 180 switch (_http_new_chunk(c)) { 181 case -1: 182 c->error = 1; 183 return (-1); 184 case 0: 185 c->eof = 1; 186 return (0); 187 } 188 } 189 190 if (c->b_size < c->chunksize) { 191 char *tmp; 192 193 if ((tmp = realloc(c->buf, c->chunksize)) == NULL) 194 return (-1); 195 c->buf = tmp; 196 c->b_size = c->chunksize; 197 } 198 199 if ((c->b_len = read(c->fd, c->buf, c->chunksize)) == -1) 200 return (-1); 201 c->chunksize -= c->b_len; 202 203 if (c->chunksize == 0) { 204 char endl; 205 if (read(c->fd, &endl, 1) == -1 || 206 read(c->fd, &endl, 1) == -1) 207 return (-1); 208 } 209 210 c->b_pos = 0; 211 212 return (c->b_len); 213 } 214 215 /* 216 * Read function 217 */ 218 static int 219 _http_readfn(void *v, char *buf, int len) 220 { 221 struct cookie *c = (struct cookie *)v; 222 int l, pos; 223 224 if (c->error) 225 return (-1); 226 if (c->eof) 227 return (0); 228 229 for (pos = 0; len > 0; pos += l, len -= l) { 230 /* empty buffer */ 231 if (!c->buf || c->b_pos == c->b_len) 232 if (_http_fillbuf(c) < 1) 233 break; 234 l = c->b_len - c->b_pos; 235 if (len < l) 236 l = len; 237 bcopy(c->buf + c->b_pos, buf + pos, l); 238 c->b_pos += l; 239 } 240 241 if (!pos && c->error) 242 return (-1); 243 return (pos); 244 } 245 246 /* 247 * Write function 248 */ 249 static int 250 _http_writefn(void *v, const char *buf, int len) 251 { 252 struct cookie *c = (struct cookie *)v; 253 254 return (write(c->fd, buf, len)); 255 } 256 257 /* 258 * Close function 259 */ 260 static int 261 _http_closefn(void *v) 262 { 263 struct cookie *c = (struct cookie *)v; 264 int r; 265 266 r = close(c->fd); 267 if (c->buf) 268 free(c->buf); 269 free(c); 270 return (r); 271 } 272 273 /* 274 * Wrap a file descriptor up 275 */ 276 static FILE * 277 _http_funopen(int fd) 278 { 279 struct cookie *c; 280 FILE *f; 281 282 if ((c = calloc(1, sizeof *c)) == NULL) { 283 _fetch_syserr(); 284 return (NULL); 285 } 286 c->fd = fd; 287 f = funopen(c, _http_readfn, _http_writefn, NULL, _http_closefn); 288 if (f == NULL) { 289 _fetch_syserr(); 290 free(c); 291 return (NULL); 292 } 293 return (f); 294 } 295 296 297 /***************************************************************************** 298 * Helper functions for talking to the server and parsing its replies 299 */ 300 301 /* Header types */ 302 typedef enum { 303 hdr_syserror = -2, 304 hdr_error = -1, 305 hdr_end = 0, 306 hdr_unknown = 1, 307 hdr_content_length, 308 hdr_content_range, 309 hdr_last_modified, 310 hdr_location, 311 hdr_transfer_encoding, 312 hdr_www_authenticate 313 } hdr_t; 314 315 /* Names of interesting headers */ 316 static struct { 317 hdr_t num; 318 const char *name; 319 } hdr_names[] = { 320 { hdr_content_length, "Content-Length" }, 321 { hdr_content_range, "Content-Range" }, 322 { hdr_last_modified, "Last-Modified" }, 323 { hdr_location, "Location" }, 324 { hdr_transfer_encoding, "Transfer-Encoding" }, 325 { hdr_www_authenticate, "WWW-Authenticate" }, 326 { hdr_unknown, NULL }, 327 }; 328 329 static char *reply_buf; 330 static size_t reply_size; 331 static size_t reply_length; 332 333 /* 334 * Send a formatted line; optionally echo to terminal 335 */ 336 static int 337 _http_cmd(int fd, const char *fmt, ...) 338 { 339 va_list ap; 340 size_t len; 341 char *msg; 342 int r; 343 344 va_start(ap, fmt); 345 len = vasprintf(&msg, fmt, ap); 346 va_end(ap); 347 348 if (msg == NULL) { 349 errno = ENOMEM; 350 _fetch_syserr(); 351 return (-1); 352 } 353 354 r = _fetch_putln(fd, msg, len); 355 free(msg); 356 357 if (r == -1) { 358 _fetch_syserr(); 359 return (-1); 360 } 361 362 return (0); 363 } 364 365 /* 366 * Get and parse status line 367 */ 368 static int 369 _http_get_reply(int fd) 370 { 371 char *p; 372 373 if (_fetch_getln(fd, &reply_buf, &reply_size, &reply_length) == -1) 374 return (-1); 375 /* 376 * A valid status line looks like "HTTP/m.n xyz reason" where m 377 * and n are the major and minor protocol version numbers and xyz 378 * is the reply code. 379 * Unfortunately, there are servers out there (NCSA 1.5.1, to name 380 * just one) that do not send a version number, so we can't rely 381 * on finding one, but if we do, insist on it being 1.0 or 1.1. 382 * We don't care about the reason phrase. 383 */ 384 if (strncmp(reply_buf, "HTTP", 4) != 0) 385 return (HTTP_PROTOCOL_ERROR); 386 p = reply_buf + 4; 387 if (*p == '/') { 388 if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1')) 389 return (HTTP_PROTOCOL_ERROR); 390 p += 4; 391 } 392 if (*p != ' ' || !isdigit(p[1]) || !isdigit(p[2]) || !isdigit(p[3])) 393 return (HTTP_PROTOCOL_ERROR); 394 395 return ((p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0')); 396 } 397 398 /* 399 * Check a header; if the type matches the given string, return a pointer 400 * to the beginning of the value. 401 */ 402 static const char * 403 _http_match(const char *str, const char *hdr) 404 { 405 while (*str && *hdr && tolower(*str++) == tolower(*hdr++)) 406 /* nothing */; 407 if (*str || *hdr != ':') 408 return (NULL); 409 while (*hdr && isspace(*++hdr)) 410 /* nothing */; 411 return (hdr); 412 } 413 414 /* 415 * Get the next header and return the appropriate symbolic code. 416 */ 417 static hdr_t 418 _http_next_header(int fd, const char **p) 419 { 420 int i; 421 422 if (_fetch_getln(fd, &reply_buf, &reply_size, &reply_length) == -1) 423 return (hdr_syserror); 424 while (reply_length && isspace(reply_buf[reply_length-1])) 425 reply_length--; 426 reply_buf[reply_length] = 0; 427 if (reply_length == 0) 428 return (hdr_end); 429 /* 430 * We could check for malformed headers but we don't really care. 431 * A valid header starts with a token immediately followed by a 432 * colon; a token is any sequence of non-control, non-whitespace 433 * characters except "()<>@,;:\\\"{}". 434 */ 435 for (i = 0; hdr_names[i].num != hdr_unknown; i++) 436 if ((*p = _http_match(hdr_names[i].name, reply_buf)) != NULL) 437 return (hdr_names[i].num); 438 return (hdr_unknown); 439 } 440 441 /* 442 * Parse a last-modified header 443 */ 444 static int 445 _http_parse_mtime(const char *p, time_t *mtime) 446 { 447 char locale[64], *r; 448 struct tm tm; 449 450 strncpy(locale, setlocale(LC_TIME, NULL), sizeof locale); 451 setlocale(LC_TIME, "C"); 452 r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm); 453 /* XXX should add support for date-2 and date-3 */ 454 setlocale(LC_TIME, locale); 455 if (r == NULL) 456 return (-1); 457 DEBUG(fprintf(stderr, "last modified: [%04d-%02d-%02d " 458 "%02d:%02d:%02d]\n", 459 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 460 tm.tm_hour, tm.tm_min, tm.tm_sec)); 461 *mtime = timegm(&tm); 462 return (0); 463 } 464 465 /* 466 * Parse a content-length header 467 */ 468 static int 469 _http_parse_length(const char *p, off_t *length) 470 { 471 off_t len; 472 473 for (len = 0; *p && isdigit(*p); ++p) 474 len = len * 10 + (*p - '0'); 475 if (*p) 476 return (-1); 477 DEBUG(fprintf(stderr, "content length: [%lld]\n", 478 (long long)len)); 479 *length = len; 480 return (0); 481 } 482 483 /* 484 * Parse a content-range header 485 */ 486 static int 487 _http_parse_range(const char *p, off_t *offset, off_t *length, off_t *size) 488 { 489 off_t first, last, len; 490 491 if (strncasecmp(p, "bytes ", 6) != 0) 492 return (-1); 493 for (first = 0, p += 6; *p && isdigit(*p); ++p) 494 first = first * 10 + *p - '0'; 495 if (*p != '-') 496 return (-1); 497 for (last = 0, ++p; *p && isdigit(*p); ++p) 498 last = last * 10 + *p - '0'; 499 if (first > last || *p != '/') 500 return (-1); 501 for (len = 0, ++p; *p && isdigit(*p); ++p) 502 len = len * 10 + *p - '0'; 503 if (*p || len < last - first + 1) 504 return (-1); 505 DEBUG(fprintf(stderr, "content range: [%lld-%lld/%lld]\n", 506 (long long)first, (long long)last, (long long)len)); 507 *offset = first; 508 *length = last - first + 1; 509 *size = len; 510 return (0); 511 } 512 513 514 /***************************************************************************** 515 * Helper functions for authorization 516 */ 517 518 /* 519 * Base64 encoding 520 */ 521 static char * 522 _http_base64(const char *src) 523 { 524 static const char base64[] = 525 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 526 "abcdefghijklmnopqrstuvwxyz" 527 "0123456789+/"; 528 char *str, *dst; 529 size_t l; 530 int t, r; 531 532 l = strlen(src); 533 if ((str = malloc(((l + 2) / 3) * 4)) == NULL) 534 return (NULL); 535 dst = str; 536 r = 0; 537 538 while (l >= 3) { 539 t = (src[0] << 16) | (src[1] << 8) | src[2]; 540 dst[0] = base64[(t >> 18) & 0x3f]; 541 dst[1] = base64[(t >> 12) & 0x3f]; 542 dst[2] = base64[(t >> 6) & 0x3f]; 543 dst[3] = base64[(t >> 0) & 0x3f]; 544 src += 3; l -= 3; 545 dst += 4; r += 4; 546 } 547 548 switch (l) { 549 case 2: 550 t = (src[0] << 16) | (src[1] << 8); 551 dst[0] = base64[(t >> 18) & 0x3f]; 552 dst[1] = base64[(t >> 12) & 0x3f]; 553 dst[2] = base64[(t >> 6) & 0x3f]; 554 dst[3] = '='; 555 dst += 4; 556 r += 4; 557 break; 558 case 1: 559 t = src[0] << 16; 560 dst[0] = base64[(t >> 18) & 0x3f]; 561 dst[1] = base64[(t >> 12) & 0x3f]; 562 dst[2] = dst[3] = '='; 563 dst += 4; 564 r += 4; 565 break; 566 case 0: 567 break; 568 } 569 570 *dst = 0; 571 return (str); 572 } 573 574 /* 575 * Encode username and password 576 */ 577 static int 578 _http_basic_auth(int fd, const char *hdr, const char *usr, const char *pwd) 579 { 580 char *upw, *auth; 581 int r; 582 583 DEBUG(fprintf(stderr, "usr: [%s]\n", usr)); 584 DEBUG(fprintf(stderr, "pwd: [%s]\n", pwd)); 585 if (asprintf(&upw, "%s:%s", usr, pwd) == -1) 586 return (-1); 587 auth = _http_base64(upw); 588 free(upw); 589 if (auth == NULL) 590 return (-1); 591 r = _http_cmd(fd, "%s: Basic %s", hdr, auth); 592 free(auth); 593 return (r); 594 } 595 596 /* 597 * Send an authorization header 598 */ 599 static int 600 _http_authorize(int fd, const char *hdr, const char *p) 601 { 602 /* basic authorization */ 603 if (strncasecmp(p, "basic:", 6) == 0) { 604 char *user, *pwd, *str; 605 int r; 606 607 /* skip realm */ 608 for (p += 6; *p && *p != ':'; ++p) 609 /* nothing */ ; 610 if (!*p || strchr(++p, ':') == NULL) 611 return (-1); 612 if ((str = strdup(p)) == NULL) 613 return (-1); /* XXX */ 614 user = str; 615 pwd = strchr(str, ':'); 616 *pwd++ = '\0'; 617 r = _http_basic_auth(fd, hdr, user, pwd); 618 free(str); 619 return (r); 620 } 621 return (-1); 622 } 623 624 625 /***************************************************************************** 626 * Helper functions for connecting to a server or proxy 627 */ 628 629 /* 630 * Connect to the correct HTTP server or proxy. 631 */ 632 static int 633 _http_connect(struct url *URL, struct url *purl, const char *flags) 634 { 635 int verbose; 636 int af, fd; 637 638 #ifdef INET6 639 af = AF_UNSPEC; 640 #else 641 af = AF_INET; 642 #endif 643 644 verbose = CHECK_FLAG('v'); 645 if (CHECK_FLAG('4')) 646 af = AF_INET; 647 #ifdef INET6 648 else if (CHECK_FLAG('6')) 649 af = AF_INET6; 650 #endif 651 652 if (purl) { 653 URL = purl; 654 } else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) { 655 /* can't talk http to an ftp server */ 656 /* XXX should set an error code */ 657 return (-1); 658 } 659 660 if ((fd = _fetch_connect(URL->host, URL->port, af, verbose)) == -1) 661 /* _fetch_connect() has already set an error code */ 662 return (-1); 663 return (fd); 664 } 665 666 static struct url * 667 _http_get_proxy(void) 668 { 669 struct url *purl; 670 char *p; 671 672 if (((p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 673 (purl = fetchParseURL(p))) { 674 if (!*purl->scheme) 675 strcpy(purl->scheme, SCHEME_HTTP); 676 if (!purl->port) 677 purl->port = _fetch_default_proxy_port(purl->scheme); 678 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 679 return (purl); 680 fetchFreeURL(purl); 681 } 682 return (NULL); 683 } 684 685 static void 686 _http_print_html(FILE *out, FILE *in) 687 { 688 size_t len; 689 char *line, *p, *q; 690 int comment, tag; 691 692 comment = tag = 0; 693 while ((line = fgetln(in, &len)) != NULL) { 694 while (len && isspace(line[len - 1])) 695 --len; 696 for (p = q = line; q < line + len; ++q) { 697 if (comment && *q == '-') { 698 if (q + 2 < line + len && 699 strcmp(q, "-->") == 0) { 700 tag = comment = 0; 701 q += 2; 702 } 703 } else if (tag && !comment && *q == '>') { 704 p = q + 1; 705 tag = 0; 706 } else if (!tag && *q == '<') { 707 if (q > p) 708 fwrite(p, q - p, 1, out); 709 tag = 1; 710 if (q + 3 < line + len && 711 strcmp(q, "<!--") == 0) { 712 comment = 1; 713 q += 3; 714 } 715 } 716 } 717 if (!tag && q > p) 718 fwrite(p, q - p, 1, out); 719 fputc('\n', out); 720 } 721 } 722 723 724 /***************************************************************************** 725 * Core 726 */ 727 728 /* 729 * Send a request and process the reply 730 */ 731 FILE * 732 _http_request(struct url *URL, const char *op, struct url_stat *us, 733 struct url *purl, const char *flags) 734 { 735 struct url *url, *new; 736 int chunked, direct, need_auth, noredirect, verbose; 737 int code, fd, i, n; 738 off_t offset, clength, length, size; 739 time_t mtime; 740 const char *p; 741 FILE *f; 742 hdr_t h; 743 char *host; 744 #ifdef INET6 745 char hbuf[MAXHOSTNAMELEN + 1]; 746 #endif 747 748 direct = CHECK_FLAG('d'); 749 noredirect = CHECK_FLAG('A'); 750 verbose = CHECK_FLAG('v'); 751 752 if (direct && purl) { 753 fetchFreeURL(purl); 754 purl = NULL; 755 } 756 757 /* try the provided URL first */ 758 url = URL; 759 760 /* if the A flag is set, we only get one try */ 761 n = noredirect ? 1 : MAX_REDIRECT; 762 i = 0; 763 764 need_auth = 0; 765 do { 766 new = NULL; 767 chunked = 0; 768 offset = 0; 769 clength = -1; 770 length = -1; 771 size = -1; 772 mtime = 0; 773 774 /* check port */ 775 if (!url->port) 776 url->port = _fetch_default_port(url->scheme); 777 778 /* were we redirected to an FTP URL? */ 779 if (purl == NULL && strcmp(url->scheme, SCHEME_FTP) == 0) { 780 if (strcmp(op, "GET") == 0) 781 return (_ftp_request(url, "RETR", us, purl, flags)); 782 else if (strcmp(op, "HEAD") == 0) 783 return (_ftp_request(url, "STAT", us, purl, flags)); 784 } 785 786 /* connect to server or proxy */ 787 if ((fd = _http_connect(url, purl, flags)) == -1) 788 goto ouch; 789 790 host = url->host; 791 #ifdef INET6 792 if (strchr(url->host, ':')) { 793 snprintf(hbuf, sizeof(hbuf), "[%s]", url->host); 794 host = hbuf; 795 } 796 #endif 797 798 /* send request */ 799 if (verbose) 800 _fetch_info("requesting %s://%s:%d%s", 801 url->scheme, host, url->port, url->doc); 802 if (purl) { 803 _http_cmd(fd, "%s %s://%s:%d%s HTTP/1.1", 804 op, url->scheme, host, url->port, url->doc); 805 } else { 806 _http_cmd(fd, "%s %s HTTP/1.1", 807 op, url->doc); 808 } 809 810 /* virtual host */ 811 if (url->port == _fetch_default_port(url->scheme)) 812 _http_cmd(fd, "Host: %s", host); 813 else 814 _http_cmd(fd, "Host: %s:%d", host, url->port); 815 816 /* proxy authorization */ 817 if (purl) { 818 if (*purl->user || *purl->pwd) 819 _http_basic_auth(fd, "Proxy-Authorization", 820 purl->user, purl->pwd); 821 else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL && *p != '\0') 822 _http_authorize(fd, "Proxy-Authorization", p); 823 } 824 825 /* server authorization */ 826 if (need_auth || *url->user || *url->pwd) { 827 if (*url->user || *url->pwd) 828 _http_basic_auth(fd, "Authorization", url->user, url->pwd); 829 else if ((p = getenv("HTTP_AUTH")) != NULL && *p != '\0') 830 _http_authorize(fd, "Authorization", p); 831 else if (fetchAuthMethod && fetchAuthMethod(url) == 0) { 832 _http_basic_auth(fd, "Authorization", url->user, url->pwd); 833 } else { 834 _http_seterr(HTTP_NEED_AUTH); 835 goto ouch; 836 } 837 } 838 839 /* other headers */ 840 if ((p = getenv("HTTP_USER_AGENT")) != NULL && *p != '\0') 841 _http_cmd(fd, "User-Agent: %s", p); 842 else 843 _http_cmd(fd, "User-Agent: %s " _LIBFETCH_VER, __progname); 844 if (url->offset) 845 _http_cmd(fd, "Range: bytes=%lld-", (long long)url->offset); 846 _http_cmd(fd, "Connection: close"); 847 _http_cmd(fd, ""); 848 849 /* get reply */ 850 switch ((code = _http_get_reply(fd))) { 851 case HTTP_OK: 852 case HTTP_PARTIAL: 853 /* fine */ 854 break; 855 case HTTP_MOVED_PERM: 856 case HTTP_MOVED_TEMP: 857 case HTTP_SEE_OTHER: 858 /* 859 * Not so fine, but we still have to read the headers to 860 * get the new location. 861 */ 862 break; 863 case HTTP_NEED_AUTH: 864 if (need_auth) { 865 /* 866 * We already sent out authorization code, so there's 867 * nothing more we can do. 868 */ 869 _http_seterr(code); 870 goto ouch; 871 } 872 /* try again, but send the password this time */ 873 if (verbose) 874 _fetch_info("server requires authorization"); 875 break; 876 case HTTP_NEED_PROXY_AUTH: 877 /* 878 * If we're talking to a proxy, we already sent our proxy 879 * authorization code, so there's nothing more we can do. 880 */ 881 _http_seterr(code); 882 goto ouch; 883 case HTTP_PROTOCOL_ERROR: 884 /* fall through */ 885 case -1: 886 _fetch_syserr(); 887 goto ouch; 888 default: 889 _http_seterr(code); 890 if (!verbose) 891 goto ouch; 892 /* fall through so we can get the full error message */ 893 } 894 895 /* get headers */ 896 do { 897 switch ((h = _http_next_header(fd, &p))) { 898 case hdr_syserror: 899 _fetch_syserr(); 900 goto ouch; 901 case hdr_error: 902 _http_seterr(HTTP_PROTOCOL_ERROR); 903 goto ouch; 904 case hdr_content_length: 905 _http_parse_length(p, &clength); 906 break; 907 case hdr_content_range: 908 _http_parse_range(p, &offset, &length, &size); 909 break; 910 case hdr_last_modified: 911 _http_parse_mtime(p, &mtime); 912 break; 913 case hdr_location: 914 if (!HTTP_REDIRECT(code)) 915 break; 916 if (new) 917 free(new); 918 if (verbose) 919 _fetch_info("%d redirect to %s", code, p); 920 if (*p == '/') 921 /* absolute path */ 922 new = fetchMakeURL(url->scheme, url->host, url->port, p, 923 url->user, url->pwd); 924 else 925 new = fetchParseURL(p); 926 if (new == NULL) { 927 /* XXX should set an error code */ 928 DEBUG(fprintf(stderr, "failed to parse new URL\n")); 929 goto ouch; 930 } 931 if (!*new->user && !*new->pwd) { 932 strcpy(new->user, url->user); 933 strcpy(new->pwd, url->pwd); 934 } 935 new->offset = url->offset; 936 new->length = url->length; 937 break; 938 case hdr_transfer_encoding: 939 /* XXX weak test*/ 940 chunked = (strcasecmp(p, "chunked") == 0); 941 break; 942 case hdr_www_authenticate: 943 if (code != HTTP_NEED_AUTH) 944 break; 945 /* if we were smarter, we'd check the method and realm */ 946 break; 947 case hdr_end: 948 /* fall through */ 949 case hdr_unknown: 950 /* ignore */ 951 break; 952 } 953 } while (h > hdr_end); 954 955 /* we have a hit or an error */ 956 if (code == HTTP_OK || code == HTTP_PARTIAL || HTTP_ERROR(code)) 957 break; 958 959 /* we need to provide authentication */ 960 if (code == HTTP_NEED_AUTH) { 961 need_auth = 1; 962 close(fd); 963 fd = -1; 964 continue; 965 } 966 967 /* all other cases: we got a redirect */ 968 need_auth = 0; 969 close(fd); 970 fd = -1; 971 if (!new) { 972 DEBUG(fprintf(stderr, "redirect with no new location\n")); 973 break; 974 } 975 if (url != URL) 976 fetchFreeURL(url); 977 url = new; 978 } while (++i < n); 979 980 /* we failed, or ran out of retries */ 981 if (fd == -1) { 982 _http_seterr(code); 983 goto ouch; 984 } 985 986 DEBUG(fprintf(stderr, "offset %lld, length %lld," 987 " size %lld, clength %lld\n", 988 (long long)offset, (long long)length, 989 (long long)size, (long long)clength)); 990 991 /* check for inconsistencies */ 992 if (clength != -1 && length != -1 && clength != length) { 993 _http_seterr(HTTP_PROTOCOL_ERROR); 994 goto ouch; 995 } 996 if (clength == -1) 997 clength = length; 998 if (clength != -1) 999 length = offset + clength; 1000 if (length != -1 && size != -1 && length != size) { 1001 _http_seterr(HTTP_PROTOCOL_ERROR); 1002 goto ouch; 1003 } 1004 if (size == -1) 1005 size = length; 1006 1007 /* fill in stats */ 1008 if (us) { 1009 us->size = size; 1010 us->atime = us->mtime = mtime; 1011 } 1012 1013 /* too far? */ 1014 if (offset > URL->offset) { 1015 _http_seterr(HTTP_PROTOCOL_ERROR); 1016 goto ouch; 1017 } 1018 1019 /* report back real offset and size */ 1020 URL->offset = offset; 1021 URL->length = clength; 1022 1023 /* wrap it up in a FILE */ 1024 if ((f = chunked ? _http_funopen(fd) : fdopen(fd, "r")) == NULL) { 1025 _fetch_syserr(); 1026 goto ouch; 1027 } 1028 1029 if (url != URL) 1030 fetchFreeURL(url); 1031 if (purl) 1032 fetchFreeURL(purl); 1033 1034 if (HTTP_ERROR(code)) { 1035 _http_print_html(stderr, f); 1036 fclose(f); 1037 f = NULL; 1038 } 1039 1040 return (f); 1041 1042 ouch: 1043 if (url != URL) 1044 fetchFreeURL(url); 1045 if (purl) 1046 fetchFreeURL(purl); 1047 if (fd != -1) 1048 close(fd); 1049 return (NULL); 1050 } 1051 1052 1053 /***************************************************************************** 1054 * Entry points 1055 */ 1056 1057 /* 1058 * Retrieve and stat a file by HTTP 1059 */ 1060 FILE * 1061 fetchXGetHTTP(struct url *URL, struct url_stat *us, const char *flags) 1062 { 1063 return (_http_request(URL, "GET", us, _http_get_proxy(), flags)); 1064 } 1065 1066 /* 1067 * Retrieve a file by HTTP 1068 */ 1069 FILE * 1070 fetchGetHTTP(struct url *URL, const char *flags) 1071 { 1072 return (fetchXGetHTTP(URL, NULL, flags)); 1073 } 1074 1075 /* 1076 * Store a file by HTTP 1077 */ 1078 FILE * 1079 fetchPutHTTP(struct url *URL __unused, const char *flags __unused) 1080 { 1081 warnx("fetchPutHTTP(): not implemented"); 1082 return (NULL); 1083 } 1084 1085 /* 1086 * Get an HTTP document's metadata 1087 */ 1088 int 1089 fetchStatHTTP(struct url *URL, struct url_stat *us, const char *flags) 1090 { 1091 FILE *f; 1092 1093 if ((f = _http_request(URL, "HEAD", us, _http_get_proxy(), flags)) == NULL) 1094 return (-1); 1095 fclose(f); 1096 return (0); 1097 } 1098 1099 /* 1100 * List a directory 1101 */ 1102 struct url_ent * 1103 fetchListHTTP(struct url *url __unused, const char *flags __unused) 1104 { 1105 warnx("fetchListHTTP(): not implemented"); 1106 return (NULL); 1107 } 1108