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