http.c revision 97891
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: head/lib/libfetch/http.c 97891 2002-06-05 21:35:35Z des $"); 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 107struct httpio 108{ 109 conn_t *conn; /* connection */ 110 int chunked; /* chunked mode */ 111 char *buf; /* chunk buffer */ 112 size_t bufsize; /* size of chunk buffer */ 113 ssize_t buflen; /* amount of data currently in buffer */ 114 int bufpos; /* current read offset in buffer */ 115 int eof; /* end-of-file flag */ 116 int error; /* error flag */ 117 size_t chunksize; /* remaining size of current chunk */ 118#ifndef NDEBUG 119 size_t total; 120#endif 121}; 122 123/* 124 * Get next chunk header 125 */ 126static int 127_http_new_chunk(struct httpio *io) 128{ 129 char *p; 130 131 if (_fetch_getln(io->conn) == -1) 132 return (-1); 133 134 if (io->conn->buflen < 2 || !ishexnumber(*io->conn->buf)) 135 return (-1); 136 137 for (p = io->conn->buf; *p && !isspace(*p); ++p) { 138 if (*p == ';') 139 break; 140 if (!ishexnumber(*p)) 141 return (-1); 142 if (isdigit(*p)) { 143 io->chunksize = io->chunksize * 16 + 144 *p - '0'; 145 } else { 146 io->chunksize = io->chunksize * 16 + 147 10 + tolower(*p) - 'a'; 148 } 149 } 150 151#ifndef NDEBUG 152 if (fetchDebug) { 153 io->total += io->chunksize; 154 if (io->chunksize == 0) 155 fprintf(stderr, "_http_fillbuf(): " 156 "end of last chunk\n"); 157 else 158 fprintf(stderr, "_http_fillbuf(): " 159 "new chunk: %lu (%lu)\n", 160 (unsigned long)io->chunksize, (unsigned long)io->total); 161 } 162#endif 163 164 return (io->chunksize); 165} 166 167/* 168 * Grow the input buffer to at least len bytes 169 */ 170static inline int 171_http_growbuf(struct httpio *io, size_t len) 172{ 173 char *tmp; 174 175 if (io->bufsize >= len) 176 return (0); 177 178 if ((tmp = realloc(io->buf, len)) == NULL) 179 return (-1); 180 io->buf = tmp; 181 io->bufsize = len; 182} 183 184/* 185 * Fill the input buffer, do chunk decoding on the fly 186 */ 187static int 188_http_fillbuf(struct httpio *io, size_t len) 189{ 190 if (io->error) 191 return (-1); 192 if (io->eof) 193 return (0); 194 195 if (io->chunked == 0) { 196 if (_http_growbuf(io, len) == -1) 197 return (-1); 198 if ((io->buflen = _fetch_read(io->conn, io->buf, len)) == -1) 199 return (-1); 200 io->bufpos = 0; 201 return (io->buflen); 202 } 203 204 if (io->chunksize == 0) { 205 switch (_http_new_chunk(io)) { 206 case -1: 207 io->error = 1; 208 return (-1); 209 case 0: 210 io->eof = 1; 211 return (0); 212 } 213 } 214 215 if (len > io->chunksize) 216 len = io->chunksize; 217 if (_http_growbuf(io, len) == -1) 218 return (-1); 219 if ((io->buflen = _fetch_read(io->conn, io->buf, len)) == -1) 220 return (-1); 221 io->chunksize -= io->buflen; 222 223 if (io->chunksize == 0) { 224 char endl[2]; 225 226 if (_fetch_read(io->conn, endl, 2) != 2 || 227 endl[0] != '\r' || endl[1] != '\n') 228 return (-1); 229 } 230 231 io->bufpos = 0; 232 233 return (io->buflen); 234} 235 236/* 237 * Read function 238 */ 239static int 240_http_readfn(void *v, char *buf, int len) 241{ 242 struct httpio *io = (struct httpio *)v; 243 int l, pos; 244 245 if (io->error) 246 return (-1); 247 if (io->eof) 248 return (0); 249 250 for (pos = 0; len > 0; pos += l, len -= l) { 251 /* empty buffer */ 252 if (!io->buf || io->bufpos == io->buflen) 253 if (_http_fillbuf(io, len) < 1) 254 break; 255 l = io->buflen - io->bufpos; 256 if (len < l) 257 l = len; 258 bcopy(io->buf + io->bufpos, buf + pos, l); 259 io->bufpos += l; 260 } 261 262 if (!pos && io->error) 263 return (-1); 264 return (pos); 265} 266 267/* 268 * Write function 269 */ 270static int 271_http_writefn(void *v, const char *buf, int len) 272{ 273 struct httpio *io = (struct httpio *)v; 274 275 return (_fetch_write(io->conn, buf, len)); 276} 277 278/* 279 * Close function 280 */ 281static int 282_http_closefn(void *v) 283{ 284 struct httpio *io = (struct httpio *)v; 285 int r; 286 287 r = _fetch_close(io->conn); 288 if (io->buf) 289 free(io->buf); 290 free(io); 291 return (r); 292} 293 294/* 295 * Wrap a file descriptor up 296 */ 297static FILE * 298_http_funopen(conn_t *conn, int chunked) 299{ 300 struct httpio *io; 301 FILE *f; 302 303 if ((io = calloc(1, sizeof *io)) == NULL) { 304 _fetch_syserr(); 305 return (NULL); 306 } 307 io->conn = conn; 308 io->chunked = chunked; 309 f = funopen(io, _http_readfn, _http_writefn, NULL, _http_closefn); 310 if (f == NULL) { 311 _fetch_syserr(); 312 free(io); 313 return (NULL); 314 } 315 return (f); 316} 317 318 319/***************************************************************************** 320 * Helper functions for talking to the server and parsing its replies 321 */ 322 323/* Header types */ 324typedef enum { 325 hdr_syserror = -2, 326 hdr_error = -1, 327 hdr_end = 0, 328 hdr_unknown = 1, 329 hdr_content_length, 330 hdr_content_range, 331 hdr_last_modified, 332 hdr_location, 333 hdr_transfer_encoding, 334 hdr_www_authenticate 335} hdr_t; 336 337/* Names of interesting headers */ 338static struct { 339 hdr_t num; 340 const char *name; 341} hdr_names[] = { 342 { hdr_content_length, "Content-Length" }, 343 { hdr_content_range, "Content-Range" }, 344 { hdr_last_modified, "Last-Modified" }, 345 { hdr_location, "Location" }, 346 { hdr_transfer_encoding, "Transfer-Encoding" }, 347 { hdr_www_authenticate, "WWW-Authenticate" }, 348 { hdr_unknown, NULL }, 349}; 350 351/* 352 * Send a formatted line; optionally echo to terminal 353 */ 354static int 355_http_cmd(conn_t *conn, const char *fmt, ...) 356{ 357 va_list ap; 358 size_t len; 359 char *msg; 360 int r; 361 362 va_start(ap, fmt); 363 len = vasprintf(&msg, fmt, ap); 364 va_end(ap); 365 366 if (msg == NULL) { 367 errno = ENOMEM; 368 _fetch_syserr(); 369 return (-1); 370 } 371 372 r = _fetch_putln(conn, msg, len); 373 free(msg); 374 375 if (r == -1) { 376 _fetch_syserr(); 377 return (-1); 378 } 379 380 return (0); 381} 382 383/* 384 * Get and parse status line 385 */ 386static int 387_http_get_reply(conn_t *conn) 388{ 389 char *p; 390 391 if (_fetch_getln(conn) == -1) 392 return (-1); 393 /* 394 * A valid status line looks like "HTTP/m.n xyz reason" where m 395 * and n are the major and minor protocol version numbers and xyz 396 * is the reply code. 397 * Unfortunately, there are servers out there (NCSA 1.5.1, to name 398 * just one) that do not send a version number, so we can't rely 399 * on finding one, but if we do, insist on it being 1.0 or 1.1. 400 * We don't care about the reason phrase. 401 */ 402 if (strncmp(conn->buf, "HTTP", 4) != 0) 403 return (HTTP_PROTOCOL_ERROR); 404 p = conn->buf + 4; 405 if (*p == '/') { 406 if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1')) 407 return (HTTP_PROTOCOL_ERROR); 408 p += 4; 409 } 410 if (*p != ' ' || !isdigit(p[1]) || !isdigit(p[2]) || !isdigit(p[3])) 411 return (HTTP_PROTOCOL_ERROR); 412 413 conn->err = (p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0'); 414 return (conn->err); 415} 416 417/* 418 * Check a header; if the type matches the given string, return a pointer 419 * to the beginning of the value. 420 */ 421static const char * 422_http_match(const char *str, const char *hdr) 423{ 424 while (*str && *hdr && tolower(*str++) == tolower(*hdr++)) 425 /* nothing */; 426 if (*str || *hdr != ':') 427 return (NULL); 428 while (*hdr && isspace(*++hdr)) 429 /* nothing */; 430 return (hdr); 431} 432 433/* 434 * Get the next header and return the appropriate symbolic code. 435 */ 436static hdr_t 437_http_next_header(conn_t *conn, const char **p) 438{ 439 int i; 440 441 if (_fetch_getln(conn) == -1) 442 return (hdr_syserror); 443 while (conn->buflen && isspace(conn->buf[conn->buflen - 1])) 444 conn->buflen--; 445 conn->buf[conn->buflen] = '\0'; 446 if (conn->buflen == 0) 447 return (hdr_end); 448 /* 449 * We could check for malformed headers but we don't really care. 450 * A valid header starts with a token immediately followed by a 451 * colon; a token is any sequence of non-control, non-whitespace 452 * characters except "()<>@,;:\\\"{}". 453 */ 454 for (i = 0; hdr_names[i].num != hdr_unknown; i++) 455 if ((*p = _http_match(hdr_names[i].name, conn->buf)) != NULL) 456 return (hdr_names[i].num); 457 return (hdr_unknown); 458} 459 460/* 461 * Parse a last-modified header 462 */ 463static int 464_http_parse_mtime(const char *p, time_t *mtime) 465{ 466 char locale[64], *r; 467 struct tm tm; 468 469 strncpy(locale, setlocale(LC_TIME, NULL), sizeof locale); 470 setlocale(LC_TIME, "C"); 471 r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm); 472 /* XXX should add support for date-2 and date-3 */ 473 setlocale(LC_TIME, locale); 474 if (r == NULL) 475 return (-1); 476 DEBUG(fprintf(stderr, "last modified: [%04d-%02d-%02d " 477 "%02d:%02d:%02d]\n", 478 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 479 tm.tm_hour, tm.tm_min, tm.tm_sec)); 480 *mtime = timegm(&tm); 481 return (0); 482} 483 484/* 485 * Parse a content-length header 486 */ 487static int 488_http_parse_length(const char *p, off_t *length) 489{ 490 off_t len; 491 492 for (len = 0; *p && isdigit(*p); ++p) 493 len = len * 10 + (*p - '0'); 494 if (*p) 495 return (-1); 496 DEBUG(fprintf(stderr, "content length: [%lld]\n", 497 (long long)len)); 498 *length = len; 499 return (0); 500} 501 502/* 503 * Parse a content-range header 504 */ 505static int 506_http_parse_range(const char *p, off_t *offset, off_t *length, off_t *size) 507{ 508 off_t first, last, len; 509 510 if (strncasecmp(p, "bytes ", 6) != 0) 511 return (-1); 512 for (first = 0, p += 6; *p && isdigit(*p); ++p) 513 first = first * 10 + *p - '0'; 514 if (*p != '-') 515 return (-1); 516 for (last = 0, ++p; *p && isdigit(*p); ++p) 517 last = last * 10 + *p - '0'; 518 if (first > last || *p != '/') 519 return (-1); 520 for (len = 0, ++p; *p && isdigit(*p); ++p) 521 len = len * 10 + *p - '0'; 522 if (*p || len < last - first + 1) 523 return (-1); 524 DEBUG(fprintf(stderr, "content range: [%lld-%lld/%lld]\n", 525 (long long)first, (long long)last, (long long)len)); 526 *offset = first; 527 *length = last - first + 1; 528 *size = len; 529 return (0); 530} 531 532 533/***************************************************************************** 534 * Helper functions for authorization 535 */ 536 537/* 538 * Base64 encoding 539 */ 540static char * 541_http_base64(const char *src) 542{ 543 static const char base64[] = 544 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 545 "abcdefghijklmnopqrstuvwxyz" 546 "0123456789+/"; 547 char *str, *dst; 548 size_t l; 549 int t, r; 550 551 l = strlen(src); 552 if ((str = malloc(((l + 2) / 3) * 4)) == NULL) 553 return (NULL); 554 dst = str; 555 r = 0; 556 557 while (l >= 3) { 558 t = (src[0] << 16) | (src[1] << 8) | src[2]; 559 dst[0] = base64[(t >> 18) & 0x3f]; 560 dst[1] = base64[(t >> 12) & 0x3f]; 561 dst[2] = base64[(t >> 6) & 0x3f]; 562 dst[3] = base64[(t >> 0) & 0x3f]; 563 src += 3; l -= 3; 564 dst += 4; r += 4; 565 } 566 567 switch (l) { 568 case 2: 569 t = (src[0] << 16) | (src[1] << 8); 570 dst[0] = base64[(t >> 18) & 0x3f]; 571 dst[1] = base64[(t >> 12) & 0x3f]; 572 dst[2] = base64[(t >> 6) & 0x3f]; 573 dst[3] = '='; 574 dst += 4; 575 r += 4; 576 break; 577 case 1: 578 t = src[0] << 16; 579 dst[0] = base64[(t >> 18) & 0x3f]; 580 dst[1] = base64[(t >> 12) & 0x3f]; 581 dst[2] = dst[3] = '='; 582 dst += 4; 583 r += 4; 584 break; 585 case 0: 586 break; 587 } 588 589 *dst = 0; 590 return (str); 591} 592 593/* 594 * Encode username and password 595 */ 596static int 597_http_basic_auth(conn_t *conn, const char *hdr, const char *usr, const char *pwd) 598{ 599 char *upw, *auth; 600 int r; 601 602 DEBUG(fprintf(stderr, "usr: [%s]\n", usr)); 603 DEBUG(fprintf(stderr, "pwd: [%s]\n", pwd)); 604 if (asprintf(&upw, "%s:%s", usr, pwd) == -1) 605 return (-1); 606 auth = _http_base64(upw); 607 free(upw); 608 if (auth == NULL) 609 return (-1); 610 r = _http_cmd(conn, "%s: Basic %s", hdr, auth); 611 free(auth); 612 return (r); 613} 614 615/* 616 * Send an authorization header 617 */ 618static int 619_http_authorize(conn_t *conn, const char *hdr, const char *p) 620{ 621 /* basic authorization */ 622 if (strncasecmp(p, "basic:", 6) == 0) { 623 char *user, *pwd, *str; 624 int r; 625 626 /* skip realm */ 627 for (p += 6; *p && *p != ':'; ++p) 628 /* nothing */ ; 629 if (!*p || strchr(++p, ':') == NULL) 630 return (-1); 631 if ((str = strdup(p)) == NULL) 632 return (-1); /* XXX */ 633 user = str; 634 pwd = strchr(str, ':'); 635 *pwd++ = '\0'; 636 r = _http_basic_auth(conn, hdr, user, pwd); 637 free(str); 638 return (r); 639 } 640 return (-1); 641} 642 643 644/***************************************************************************** 645 * Helper functions for connecting to a server or proxy 646 */ 647 648/* 649 * Connect to the correct HTTP server or proxy. 650 */ 651static conn_t * 652_http_connect(struct url *URL, struct url *purl, const char *flags) 653{ 654 conn_t *conn; 655 int verbose; 656 int af; 657 658#ifdef INET6 659 af = AF_UNSPEC; 660#else 661 af = AF_INET; 662#endif 663 664 verbose = CHECK_FLAG('v'); 665 if (CHECK_FLAG('4')) 666 af = AF_INET; 667#ifdef INET6 668 else if (CHECK_FLAG('6')) 669 af = AF_INET6; 670#endif 671 672 if (purl && strcasecmp(URL->scheme, SCHEME_HTTPS) != 0) { 673 URL = purl; 674 } else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) { 675 /* can't talk http to an ftp server */ 676 /* XXX should set an error code */ 677 return (NULL); 678 } 679 680 if ((conn = _fetch_connect(URL->host, URL->port, af, verbose)) == NULL) 681 /* _fetch_connect() has already set an error code */ 682 return (NULL); 683 if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 && 684 _fetch_ssl(conn, verbose) == -1) { 685 _fetch_close(conn); 686 /* grrr */ 687 errno = EAUTH; 688 _fetch_syserr(); 689 return (NULL); 690 } 691 return (conn); 692} 693 694static struct url * 695_http_get_proxy(void) 696{ 697 struct url *purl; 698 char *p; 699 700 if (((p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 701 (purl = fetchParseURL(p))) { 702 if (!*purl->scheme) 703 strcpy(purl->scheme, SCHEME_HTTP); 704 if (!purl->port) 705 purl->port = _fetch_default_proxy_port(purl->scheme); 706 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 707 return (purl); 708 fetchFreeURL(purl); 709 } 710 return (NULL); 711} 712 713static void 714_http_print_html(FILE *out, FILE *in) 715{ 716 size_t len; 717 char *line, *p, *q; 718 int comment, tag; 719 720 comment = tag = 0; 721 while ((line = fgetln(in, &len)) != NULL) { 722 while (len && isspace(line[len - 1])) 723 --len; 724 for (p = q = line; q < line + len; ++q) { 725 if (comment && *q == '-') { 726 if (q + 2 < line + len && 727 strcmp(q, "-->") == 0) { 728 tag = comment = 0; 729 q += 2; 730 } 731 } else if (tag && !comment && *q == '>') { 732 p = q + 1; 733 tag = 0; 734 } else if (!tag && *q == '<') { 735 if (q > p) 736 fwrite(p, q - p, 1, out); 737 tag = 1; 738 if (q + 3 < line + len && 739 strcmp(q, "<!--") == 0) { 740 comment = 1; 741 q += 3; 742 } 743 } 744 } 745 if (!tag && q > p) 746 fwrite(p, q - p, 1, out); 747 fputc('\n', out); 748 } 749} 750 751 752/***************************************************************************** 753 * Core 754 */ 755 756/* 757 * Send a request and process the reply 758 * 759 * XXX This function is way too long, the do..while loop should be split 760 * XXX off into a separate function. 761 */ 762FILE * 763_http_request(struct url *URL, const char *op, struct url_stat *us, 764 struct url *purl, const char *flags) 765{ 766 conn_t *conn; 767 struct url *url, *new; 768 int chunked, direct, need_auth, noredirect, verbose; 769 int i, n; 770 off_t offset, clength, length, size; 771 time_t mtime; 772 const char *p; 773 FILE *f; 774 hdr_t h; 775 char *host; 776#ifdef INET6 777 char hbuf[MAXHOSTNAMELEN + 1]; 778#endif 779 780 direct = CHECK_FLAG('d'); 781 noredirect = CHECK_FLAG('A'); 782 verbose = CHECK_FLAG('v'); 783 784 if (direct && purl) { 785 fetchFreeURL(purl); 786 purl = NULL; 787 } 788 789 /* try the provided URL first */ 790 url = URL; 791 792 /* if the A flag is set, we only get one try */ 793 n = noredirect ? 1 : MAX_REDIRECT; 794 i = 0; 795 796 need_auth = 0; 797 do { 798 new = NULL; 799 chunked = 0; 800 offset = 0; 801 clength = -1; 802 length = -1; 803 size = -1; 804 mtime = 0; 805 806 /* check port */ 807 if (!url->port) 808 url->port = _fetch_default_port(url->scheme); 809 810 /* were we redirected to an FTP URL? */ 811 if (purl == NULL && strcmp(url->scheme, SCHEME_FTP) == 0) { 812 if (strcmp(op, "GET") == 0) 813 return (_ftp_request(url, "RETR", us, purl, flags)); 814 else if (strcmp(op, "HEAD") == 0) 815 return (_ftp_request(url, "STAT", us, purl, flags)); 816 } 817 818 /* connect to server or proxy */ 819 if ((conn = _http_connect(url, purl, flags)) == NULL) 820 goto ouch; 821 822 host = url->host; 823#ifdef INET6 824 if (strchr(url->host, ':')) { 825 snprintf(hbuf, sizeof(hbuf), "[%s]", url->host); 826 host = hbuf; 827 } 828#endif 829 830 /* send request */ 831 if (verbose) 832 _fetch_info("requesting %s://%s:%d%s", 833 url->scheme, host, url->port, url->doc); 834 if (purl) { 835 _http_cmd(conn, "%s %s://%s:%d%s HTTP/1.1", 836 op, url->scheme, host, url->port, url->doc); 837 } else { 838 _http_cmd(conn, "%s %s HTTP/1.1", 839 op, url->doc); 840 } 841 842 /* virtual host */ 843 if (url->port == _fetch_default_port(url->scheme)) 844 _http_cmd(conn, "Host: %s", host); 845 else 846 _http_cmd(conn, "Host: %s:%d", host, url->port); 847 848 /* proxy authorization */ 849 if (purl) { 850 if (*purl->user || *purl->pwd) 851 _http_basic_auth(conn, "Proxy-Authorization", 852 purl->user, purl->pwd); 853 else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL && *p != '\0') 854 _http_authorize(conn, "Proxy-Authorization", p); 855 } 856 857 /* server authorization */ 858 if (need_auth || *url->user || *url->pwd) { 859 if (*url->user || *url->pwd) 860 _http_basic_auth(conn, "Authorization", url->user, url->pwd); 861 else if ((p = getenv("HTTP_AUTH")) != NULL && *p != '\0') 862 _http_authorize(conn, "Authorization", p); 863 else if (fetchAuthMethod && fetchAuthMethod(url) == 0) { 864 _http_basic_auth(conn, "Authorization", url->user, url->pwd); 865 } else { 866 _http_seterr(HTTP_NEED_AUTH); 867 goto ouch; 868 } 869 } 870 871 /* other headers */ 872 if ((p = getenv("HTTP_USER_AGENT")) != NULL && *p != '\0') 873 _http_cmd(conn, "User-Agent: %s", p); 874 else 875 _http_cmd(conn, "User-Agent: %s " _LIBFETCH_VER, getprogname()); 876 if (url->offset) 877 _http_cmd(conn, "Range: bytes=%lld-", (long long)url->offset); 878 _http_cmd(conn, "Connection: close"); 879 _http_cmd(conn, ""); 880 881 /* get reply */ 882 switch (_http_get_reply(conn)) { 883 case HTTP_OK: 884 case HTTP_PARTIAL: 885 /* fine */ 886 break; 887 case HTTP_MOVED_PERM: 888 case HTTP_MOVED_TEMP: 889 case HTTP_SEE_OTHER: 890 /* 891 * Not so fine, but we still have to read the headers to 892 * get the new location. 893 */ 894 break; 895 case HTTP_NEED_AUTH: 896 if (need_auth) { 897 /* 898 * We already sent out authorization code, so there's 899 * nothing more we can do. 900 */ 901 _http_seterr(conn->err); 902 goto ouch; 903 } 904 /* try again, but send the password this time */ 905 if (verbose) 906 _fetch_info("server requires authorization"); 907 break; 908 case HTTP_NEED_PROXY_AUTH: 909 /* 910 * If we're talking to a proxy, we already sent our proxy 911 * authorization code, so there's nothing more we can do. 912 */ 913 _http_seterr(conn->err); 914 goto ouch; 915 case HTTP_PROTOCOL_ERROR: 916 /* fall through */ 917 case -1: 918 _fetch_syserr(); 919 goto ouch; 920 default: 921 _http_seterr(conn->err); 922 if (!verbose) 923 goto ouch; 924 /* fall through so we can get the full error message */ 925 } 926 927 /* get headers */ 928 do { 929 switch ((h = _http_next_header(conn, &p))) { 930 case hdr_syserror: 931 _fetch_syserr(); 932 goto ouch; 933 case hdr_error: 934 _http_seterr(HTTP_PROTOCOL_ERROR); 935 goto ouch; 936 case hdr_content_length: 937 _http_parse_length(p, &clength); 938 break; 939 case hdr_content_range: 940 _http_parse_range(p, &offset, &length, &size); 941 break; 942 case hdr_last_modified: 943 _http_parse_mtime(p, &mtime); 944 break; 945 case hdr_location: 946 if (!HTTP_REDIRECT(conn->err)) 947 break; 948 if (new) 949 free(new); 950 if (verbose) 951 _fetch_info("%d redirect to %s", conn->err, p); 952 if (*p == '/') 953 /* absolute path */ 954 new = fetchMakeURL(url->scheme, url->host, url->port, p, 955 url->user, url->pwd); 956 else 957 new = fetchParseURL(p); 958 if (new == NULL) { 959 /* XXX should set an error code */ 960 DEBUG(fprintf(stderr, "failed to parse new URL\n")); 961 goto ouch; 962 } 963 if (!*new->user && !*new->pwd) { 964 strcpy(new->user, url->user); 965 strcpy(new->pwd, url->pwd); 966 } 967 new->offset = url->offset; 968 new->length = url->length; 969 break; 970 case hdr_transfer_encoding: 971 /* XXX weak test*/ 972 chunked = (strcasecmp(p, "chunked") == 0); 973 break; 974 case hdr_www_authenticate: 975 if (conn->err != HTTP_NEED_AUTH) 976 break; 977 /* if we were smarter, we'd check the method and realm */ 978 break; 979 case hdr_end: 980 /* fall through */ 981 case hdr_unknown: 982 /* ignore */ 983 break; 984 } 985 } while (h > hdr_end); 986 987 /* we have a hit or an error */ 988 if (conn->err == HTTP_OK || conn->err == HTTP_PARTIAL || HTTP_ERROR(conn->err)) 989 break; 990 991 /* we need to provide authentication */ 992 if (conn->err == HTTP_NEED_AUTH) { 993 need_auth = 1; 994 _fetch_close(conn); 995 conn = NULL; 996 continue; 997 } 998 999 /* all other cases: we got a redirect */ 1000 need_auth = 0; 1001 _fetch_close(conn); 1002 conn = NULL; 1003 if (!new) { 1004 DEBUG(fprintf(stderr, "redirect with no new location\n")); 1005 break; 1006 } 1007 if (url != URL) 1008 fetchFreeURL(url); 1009 url = new; 1010 } while (++i < n); 1011 1012 /* we failed, or ran out of retries */ 1013 if (conn == NULL) { 1014 _http_seterr(conn->err); 1015 goto ouch; 1016 } 1017 1018 DEBUG(fprintf(stderr, "offset %lld, length %lld," 1019 " size %lld, clength %lld\n", 1020 (long long)offset, (long long)length, 1021 (long long)size, (long long)clength)); 1022 1023 /* check for inconsistencies */ 1024 if (clength != -1 && length != -1 && clength != length) { 1025 _http_seterr(HTTP_PROTOCOL_ERROR); 1026 goto ouch; 1027 } 1028 if (clength == -1) 1029 clength = length; 1030 if (clength != -1) 1031 length = offset + clength; 1032 if (length != -1 && size != -1 && length != size) { 1033 _http_seterr(HTTP_PROTOCOL_ERROR); 1034 goto ouch; 1035 } 1036 if (size == -1) 1037 size = length; 1038 1039 /* fill in stats */ 1040 if (us) { 1041 us->size = size; 1042 us->atime = us->mtime = mtime; 1043 } 1044 1045 /* too far? */ 1046 if (offset > URL->offset) { 1047 _http_seterr(HTTP_PROTOCOL_ERROR); 1048 goto ouch; 1049 } 1050 1051 /* report back real offset and size */ 1052 URL->offset = offset; 1053 URL->length = clength; 1054 1055 /* wrap it up in a FILE */ 1056 if ((f = _http_funopen(conn, chunked)) == NULL) { 1057 _fetch_syserr(); 1058 goto ouch; 1059 } 1060 1061 if (url != URL) 1062 fetchFreeURL(url); 1063 if (purl) 1064 fetchFreeURL(purl); 1065 1066 if (HTTP_ERROR(conn->err)) { 1067 _http_print_html(stderr, f); 1068 fclose(f); 1069 f = NULL; 1070 } 1071 1072 return (f); 1073 1074ouch: 1075 if (url != URL) 1076 fetchFreeURL(url); 1077 if (purl) 1078 fetchFreeURL(purl); 1079 if (conn != NULL) 1080 _fetch_close(conn); 1081 return (NULL); 1082} 1083 1084 1085/***************************************************************************** 1086 * Entry points 1087 */ 1088 1089/* 1090 * Retrieve and stat a file by HTTP 1091 */ 1092FILE * 1093fetchXGetHTTP(struct url *URL, struct url_stat *us, const char *flags) 1094{ 1095 return (_http_request(URL, "GET", us, _http_get_proxy(), flags)); 1096} 1097 1098/* 1099 * Retrieve a file by HTTP 1100 */ 1101FILE * 1102fetchGetHTTP(struct url *URL, const char *flags) 1103{ 1104 return (fetchXGetHTTP(URL, NULL, flags)); 1105} 1106 1107/* 1108 * Store a file by HTTP 1109 */ 1110FILE * 1111fetchPutHTTP(struct url *URL __unused, const char *flags __unused) 1112{ 1113 warnx("fetchPutHTTP(): not implemented"); 1114 return (NULL); 1115} 1116 1117/* 1118 * Get an HTTP document's metadata 1119 */ 1120int 1121fetchStatHTTP(struct url *URL, struct url_stat *us, const char *flags) 1122{ 1123 FILE *f; 1124 1125 if ((f = _http_request(URL, "HEAD", us, _http_get_proxy(), flags)) == NULL) 1126 return (-1); 1127 fclose(f); 1128 return (0); 1129} 1130 1131/* 1132 * List a directory 1133 */ 1134struct url_ent * 1135fetchListHTTP(struct url *url __unused, const char *flags __unused) 1136{ 1137 warnx("fetchListHTTP(): not implemented"); 1138 return (NULL); 1139} 1140