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