1 /*- 2 * Copyright (c) 2000-2004 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 #include <sys/time.h> 67 68 #include <ctype.h> 69 #include <err.h> 70 #include <errno.h> 71 #include <locale.h> 72 #include <netdb.h> 73 #include <stdarg.h> 74 #include <stdio.h> 75 #include <stdlib.h> 76 #include <string.h> 77 #include <time.h> 78 #include <unistd.h> 79 #include <md5.h> 80 81 #include <netinet/in.h> 82 #include <netinet/tcp.h> 83 84 #include "fetch.h" 85 #include "common.h" 86 #include "httperr.h" 87 88 /* Maximum number of redirects to follow */ 89 #define MAX_REDIRECT 5 90 91 /* Symbolic names for reply codes we care about */ 92 #define HTTP_OK 200 93 #define HTTP_PARTIAL 206 94 #define HTTP_MOVED_PERM 301 95 #define HTTP_MOVED_TEMP 302 96 #define HTTP_SEE_OTHER 303 97 #define HTTP_NOT_MODIFIED 304 98 #define HTTP_TEMP_REDIRECT 307 99 #define HTTP_NEED_AUTH 401 100 #define HTTP_NEED_PROXY_AUTH 407 101 #define HTTP_BAD_RANGE 416 102 #define HTTP_PROTOCOL_ERROR 999 103 104 #define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \ 105 || (xyz) == HTTP_MOVED_TEMP \ 106 || (xyz) == HTTP_TEMP_REDIRECT \ 107 || (xyz) == HTTP_SEE_OTHER) 108 109 #define HTTP_ERROR(xyz) ((xyz) > 400 && (xyz) < 599) 110 111 112 /***************************************************************************** 113 * I/O functions for decoding chunked streams 114 */ 115 116 struct httpio 117 { 118 conn_t *conn; /* connection */ 119 int chunked; /* chunked mode */ 120 char *buf; /* chunk buffer */ 121 size_t bufsize; /* size of chunk buffer */ 122 ssize_t buflen; /* amount of data currently in buffer */ 123 int bufpos; /* current read offset in buffer */ 124 int eof; /* end-of-file flag */ 125 int error; /* error flag */ 126 size_t chunksize; /* remaining size of current chunk */ 127 #ifndef NDEBUG 128 size_t total; 129 #endif 130 }; 131 132 /* 133 * Get next chunk header 134 */ 135 static int 136 http_new_chunk(struct httpio *io) 137 { 138 char *p; 139 140 if (fetch_getln(io->conn) == -1) 141 return (-1); 142 143 if (io->conn->buflen < 2 || !isxdigit((unsigned char)*io->conn->buf)) 144 return (-1); 145 146 for (p = io->conn->buf; *p && !isspace((unsigned char)*p); ++p) { 147 if (*p == ';') 148 break; 149 if (!isxdigit((unsigned char)*p)) 150 return (-1); 151 if (isdigit((unsigned char)*p)) { 152 io->chunksize = io->chunksize * 16 + 153 *p - '0'; 154 } else { 155 io->chunksize = io->chunksize * 16 + 156 10 + tolower((unsigned char)*p) - 'a'; 157 } 158 } 159 160 #ifndef NDEBUG 161 if (fetchDebug) { 162 io->total += io->chunksize; 163 if (io->chunksize == 0) 164 fprintf(stderr, "%s(): end of last chunk\n", __func__); 165 else 166 fprintf(stderr, "%s(): new chunk: %lu (%lu)\n", 167 __func__, (unsigned long)io->chunksize, 168 (unsigned long)io->total); 169 } 170 #endif 171 172 return (io->chunksize); 173 } 174 175 /* 176 * Grow the input buffer to at least len bytes 177 */ 178 static inline int 179 http_growbuf(struct httpio *io, size_t len) 180 { 181 char *tmp; 182 183 if (io->bufsize >= len) 184 return (0); 185 186 if ((tmp = realloc(io->buf, len)) == NULL) 187 return (-1); 188 io->buf = tmp; 189 io->bufsize = len; 190 return (0); 191 } 192 193 /* 194 * Fill the input buffer, do chunk decoding on the fly 195 */ 196 static int 197 http_fillbuf(struct httpio *io, size_t len) 198 { 199 if (io->error) 200 return (-1); 201 if (io->eof) 202 return (0); 203 204 if (io->chunked == 0) { 205 if (http_growbuf(io, len) == -1) 206 return (-1); 207 if ((io->buflen = fetch_read(io->conn, io->buf, len)) == -1) { 208 io->error = 1; 209 return (-1); 210 } 211 io->bufpos = 0; 212 return (io->buflen); 213 } 214 215 if (io->chunksize == 0) { 216 switch (http_new_chunk(io)) { 217 case -1: 218 io->error = 1; 219 return (-1); 220 case 0: 221 io->eof = 1; 222 return (0); 223 } 224 } 225 226 if (len > io->chunksize) 227 len = io->chunksize; 228 if (http_growbuf(io, len) == -1) 229 return (-1); 230 if ((io->buflen = fetch_read(io->conn, io->buf, len)) == -1) { 231 io->error = 1; 232 return (-1); 233 } 234 io->chunksize -= io->buflen; 235 236 if (io->chunksize == 0) { 237 char endl[2]; 238 239 if (fetch_read(io->conn, endl, 2) != 2 || 240 endl[0] != '\r' || endl[1] != '\n') 241 return (-1); 242 } 243 244 io->bufpos = 0; 245 246 return (io->buflen); 247 } 248 249 /* 250 * Read function 251 */ 252 static int 253 http_readfn(void *v, char *buf, int len) 254 { 255 struct httpio *io = (struct httpio *)v; 256 int l, pos; 257 258 if (io->error) 259 return (-1); 260 if (io->eof) 261 return (0); 262 263 for (pos = 0; len > 0; pos += l, len -= l) { 264 /* empty buffer */ 265 if (!io->buf || io->bufpos == io->buflen) 266 if (http_fillbuf(io, len) < 1) 267 break; 268 l = io->buflen - io->bufpos; 269 if (len < l) 270 l = len; 271 memcpy(buf + pos, io->buf + io->bufpos, l); 272 io->bufpos += l; 273 } 274 275 if (!pos && io->error) 276 return (-1); 277 return (pos); 278 } 279 280 /* 281 * Write function 282 */ 283 static int 284 http_writefn(void *v, const char *buf, int len) 285 { 286 struct httpio *io = (struct httpio *)v; 287 288 return (fetch_write(io->conn, buf, len)); 289 } 290 291 /* 292 * Close function 293 */ 294 static int 295 http_closefn(void *v) 296 { 297 struct httpio *io = (struct httpio *)v; 298 int r; 299 300 r = fetch_close(io->conn); 301 if (io->buf) 302 free(io->buf); 303 free(io); 304 return (r); 305 } 306 307 /* 308 * Wrap a file descriptor up 309 */ 310 static FILE * 311 http_funopen(conn_t *conn, int chunked) 312 { 313 struct httpio *io; 314 FILE *f; 315 316 if ((io = calloc(1, sizeof(*io))) == NULL) { 317 fetch_syserr(); 318 return (NULL); 319 } 320 io->conn = conn; 321 io->chunked = chunked; 322 f = funopen(io, http_readfn, http_writefn, NULL, http_closefn); 323 if (f == NULL) { 324 fetch_syserr(); 325 free(io); 326 return (NULL); 327 } 328 return (f); 329 } 330 331 332 /***************************************************************************** 333 * Helper functions for talking to the server and parsing its replies 334 */ 335 336 /* Header types */ 337 typedef enum { 338 hdr_syserror = -2, 339 hdr_error = -1, 340 hdr_end = 0, 341 hdr_unknown = 1, 342 hdr_content_length, 343 hdr_content_range, 344 hdr_last_modified, 345 hdr_location, 346 hdr_transfer_encoding, 347 hdr_www_authenticate, 348 hdr_proxy_authenticate, 349 } hdr_t; 350 351 /* Names of interesting headers */ 352 static struct { 353 hdr_t num; 354 const char *name; 355 } hdr_names[] = { 356 { hdr_content_length, "Content-Length" }, 357 { hdr_content_range, "Content-Range" }, 358 { hdr_last_modified, "Last-Modified" }, 359 { hdr_location, "Location" }, 360 { hdr_transfer_encoding, "Transfer-Encoding" }, 361 { hdr_www_authenticate, "WWW-Authenticate" }, 362 { hdr_proxy_authenticate, "Proxy-Authenticate" }, 363 { hdr_unknown, NULL }, 364 }; 365 366 /* 367 * Send a formatted line; optionally echo to terminal 368 */ 369 static int 370 http_cmd(conn_t *conn, const char *fmt, ...) 371 { 372 va_list ap; 373 size_t len; 374 char *msg; 375 int r; 376 377 va_start(ap, fmt); 378 len = vasprintf(&msg, fmt, ap); 379 va_end(ap); 380 381 if (msg == NULL) { 382 errno = ENOMEM; 383 fetch_syserr(); 384 return (-1); 385 } 386 387 r = fetch_putln(conn, msg, len); 388 free(msg); 389 390 if (r == -1) { 391 fetch_syserr(); 392 return (-1); 393 } 394 395 return (0); 396 } 397 398 /* 399 * Get and parse status line 400 */ 401 static int 402 http_get_reply(conn_t *conn) 403 { 404 char *p; 405 406 if (fetch_getln(conn) == -1) 407 return (-1); 408 /* 409 * A valid status line looks like "HTTP/m.n xyz reason" where m 410 * and n are the major and minor protocol version numbers and xyz 411 * is the reply code. 412 * Unfortunately, there are servers out there (NCSA 1.5.1, to name 413 * just one) that do not send a version number, so we can't rely 414 * on finding one, but if we do, insist on it being 1.0 or 1.1. 415 * We don't care about the reason phrase. 416 */ 417 if (strncmp(conn->buf, "HTTP", 4) != 0) 418 return (HTTP_PROTOCOL_ERROR); 419 p = conn->buf + 4; 420 if (*p == '/') { 421 if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1')) 422 return (HTTP_PROTOCOL_ERROR); 423 p += 4; 424 } 425 if (*p != ' ' || 426 !isdigit((unsigned char)p[1]) || 427 !isdigit((unsigned char)p[2]) || 428 !isdigit((unsigned char)p[3])) 429 return (HTTP_PROTOCOL_ERROR); 430 431 conn->err = (p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0'); 432 return (conn->err); 433 } 434 435 /* 436 * Check a header; if the type matches the given string, return a pointer 437 * to the beginning of the value. 438 */ 439 static const char * 440 http_match(const char *str, const char *hdr) 441 { 442 while (*str && *hdr && 443 tolower((unsigned char)*str++) == tolower((unsigned char)*hdr++)) 444 /* nothing */; 445 if (*str || *hdr != ':') 446 return (NULL); 447 while (*hdr && isspace((unsigned char)*++hdr)) 448 /* nothing */; 449 return (hdr); 450 } 451 452 453 /* 454 * Get the next header and return the appropriate symbolic code. We 455 * need to read one line ahead for checking for a continuation line 456 * belonging to the current header (continuation lines start with 457 * white space). 458 * 459 * We get called with a fresh line already in the conn buffer, either 460 * from the previous http_next_header() invocation, or, the first 461 * time, from a fetch_getln() performed by our caller. 462 * 463 * This stops when we encounter an empty line (we dont read beyond the header 464 * area). 465 * 466 * Note that the "headerbuf" is just a place to return the result. Its 467 * contents are not used for the next call. This means that no cleanup 468 * is needed when ie doing another connection, just call the cleanup when 469 * fully done to deallocate memory. 470 */ 471 472 /* Limit the max number of continuation lines to some reasonable value */ 473 #define HTTP_MAX_CONT_LINES 10 474 475 /* Place into which to build a header from one or several lines */ 476 typedef struct { 477 char *buf; /* buffer */ 478 size_t bufsize; /* buffer size */ 479 size_t buflen; /* length of buffer contents */ 480 } http_headerbuf_t; 481 482 static void 483 init_http_headerbuf(http_headerbuf_t *buf) 484 { 485 buf->buf = NULL; 486 buf->bufsize = 0; 487 buf->buflen = 0; 488 } 489 490 static void 491 clean_http_headerbuf(http_headerbuf_t *buf) 492 { 493 if (buf->buf) 494 free(buf->buf); 495 init_http_headerbuf(buf); 496 } 497 498 /* Remove whitespace at the end of the buffer */ 499 static void 500 http_conn_trimright(conn_t *conn) 501 { 502 while (conn->buflen && 503 isspace((unsigned char)conn->buf[conn->buflen - 1])) 504 conn->buflen--; 505 conn->buf[conn->buflen] = '\0'; 506 } 507 508 static hdr_t 509 http_next_header(conn_t *conn, http_headerbuf_t *hbuf, const char **p) 510 { 511 int i, len; 512 513 /* 514 * Have to do the stripping here because of the first line. So 515 * it's done twice for the subsequent lines. No big deal 516 */ 517 http_conn_trimright(conn); 518 if (conn->buflen == 0) 519 return (hdr_end); 520 521 /* Copy the line to the headerbuf */ 522 if (hbuf->bufsize < conn->buflen + 1) { 523 if ((hbuf->buf = realloc(hbuf->buf, conn->buflen + 1)) == NULL) 524 return (hdr_syserror); 525 hbuf->bufsize = conn->buflen + 1; 526 } 527 strcpy(hbuf->buf, conn->buf); 528 hbuf->buflen = conn->buflen; 529 530 /* 531 * Fetch possible continuation lines. Stop at 1st non-continuation 532 * and leave it in the conn buffer 533 */ 534 for (i = 0; i < HTTP_MAX_CONT_LINES; i++) { 535 if (fetch_getln(conn) == -1) 536 return (hdr_syserror); 537 538 /* 539 * Note: we carry on the idea from the previous version 540 * that a pure whitespace line is equivalent to an empty 541 * one (so it's not continuation and will be handled when 542 * we are called next) 543 */ 544 http_conn_trimright(conn); 545 if (conn->buf[0] != ' ' && conn->buf[0] != "\t"[0]) 546 break; 547 548 /* Got a continuation line. Concatenate to previous */ 549 len = hbuf->buflen + conn->buflen; 550 if (hbuf->bufsize < len + 1) { 551 len *= 2; 552 if ((hbuf->buf = realloc(hbuf->buf, len + 1)) == NULL) 553 return (hdr_syserror); 554 hbuf->bufsize = len + 1; 555 } 556 strcpy(hbuf->buf + hbuf->buflen, conn->buf); 557 hbuf->buflen += conn->buflen; 558 } 559 560 /* 561 * We could check for malformed headers but we don't really care. 562 * A valid header starts with a token immediately followed by a 563 * colon; a token is any sequence of non-control, non-whitespace 564 * characters except "()<>@,;:\\\"{}". 565 */ 566 for (i = 0; hdr_names[i].num != hdr_unknown; i++) 567 if ((*p = http_match(hdr_names[i].name, hbuf->buf)) != NULL) 568 return (hdr_names[i].num); 569 570 return (hdr_unknown); 571 } 572 573 /************************** 574 * [Proxy-]Authenticate header parsing 575 */ 576 577 /* 578 * Read doublequote-delimited string into output buffer obuf (allocated 579 * by caller, whose responsibility it is to ensure that it's big enough) 580 * cp points to the first char after the initial '"' 581 * Handles \ quoting 582 * Returns pointer to the first char after the terminating double quote, or 583 * NULL for error. 584 */ 585 static const char * 586 http_parse_headerstring(const char *cp, char *obuf) 587 { 588 for (;;) { 589 switch (*cp) { 590 case 0: /* Unterminated string */ 591 *obuf = 0; 592 return (NULL); 593 case '"': /* Ending quote */ 594 *obuf = 0; 595 return (++cp); 596 case '\\': 597 if (*++cp == 0) { 598 *obuf = 0; 599 return (NULL); 600 } 601 /* FALLTHROUGH */ 602 default: 603 *obuf++ = *cp++; 604 } 605 } 606 } 607 608 /* Http auth challenge schemes */ 609 typedef enum {HTTPAS_UNKNOWN, HTTPAS_BASIC,HTTPAS_DIGEST} http_auth_schemes_t; 610 611 /* Data holder for a Basic or Digest challenge. */ 612 typedef struct { 613 http_auth_schemes_t scheme; 614 char *realm; 615 char *qop; 616 char *nonce; 617 char *opaque; 618 char *algo; 619 int stale; 620 int nc; /* Nonce count */ 621 } http_auth_challenge_t; 622 623 static void 624 init_http_auth_challenge(http_auth_challenge_t *b) 625 { 626 b->scheme = HTTPAS_UNKNOWN; 627 b->realm = b->qop = b->nonce = b->opaque = b->algo = NULL; 628 b->stale = b->nc = 0; 629 } 630 631 static void 632 clean_http_auth_challenge(http_auth_challenge_t *b) 633 { 634 if (b->realm) 635 free(b->realm); 636 if (b->qop) 637 free(b->qop); 638 if (b->nonce) 639 free(b->nonce); 640 if (b->opaque) 641 free(b->opaque); 642 if (b->algo) 643 free(b->algo); 644 init_http_auth_challenge(b); 645 } 646 647 /* Data holder for an array of challenges offered in an http response. */ 648 #define MAX_CHALLENGES 10 649 typedef struct { 650 http_auth_challenge_t *challenges[MAX_CHALLENGES]; 651 int count; /* Number of parsed challenges in the array */ 652 int valid; /* We did parse an authenticate header */ 653 } http_auth_challenges_t; 654 655 static void 656 init_http_auth_challenges(http_auth_challenges_t *cs) 657 { 658 int i; 659 for (i = 0; i < MAX_CHALLENGES; i++) 660 cs->challenges[i] = NULL; 661 cs->count = cs->valid = 0; 662 } 663 664 static void 665 clean_http_auth_challenges(http_auth_challenges_t *cs) 666 { 667 int i; 668 /* We rely on non-zero pointers being allocated, not on the count */ 669 for (i = 0; i < MAX_CHALLENGES; i++) { 670 if (cs->challenges[i] != NULL) { 671 clean_http_auth_challenge(cs->challenges[i]); 672 free(cs->challenges[i]); 673 } 674 } 675 init_http_auth_challenges(cs); 676 } 677 678 /* 679 * Enumeration for lexical elements. Separators will be returned as their own 680 * ascii value 681 */ 682 typedef enum {HTTPHL_WORD=256, HTTPHL_STRING=257, HTTPHL_END=258, 683 HTTPHL_ERROR = 259} http_header_lex_t; 684 685 /* 686 * Determine what kind of token comes next and return possible value 687 * in buf, which is supposed to have been allocated big enough by 688 * caller. Advance input pointer and return element type. 689 */ 690 static int 691 http_header_lex(const char **cpp, char *buf) 692 { 693 size_t l; 694 /* Eat initial whitespace */ 695 *cpp += strspn(*cpp, " \t"); 696 if (**cpp == 0) 697 return (HTTPHL_END); 698 699 /* Separator ? */ 700 if (**cpp == ',' || **cpp == '=') 701 return (*((*cpp)++)); 702 703 /* String ? */ 704 if (**cpp == '"') { 705 *cpp = http_parse_headerstring(++*cpp, buf); 706 if (*cpp == NULL) 707 return (HTTPHL_ERROR); 708 return (HTTPHL_STRING); 709 } 710 711 /* Read other token, until separator or whitespace */ 712 l = strcspn(*cpp, " \t,="); 713 memcpy(buf, *cpp, l); 714 buf[l] = 0; 715 *cpp += l; 716 return (HTTPHL_WORD); 717 } 718 719 /* 720 * Read challenges from http xxx-authenticate header and accumulate them 721 * in the challenges list structure. 722 * 723 * Headers with multiple challenges are specified by rfc2617, but 724 * servers (ie: squid) often send them in separate headers instead, 725 * which in turn is forbidden by the http spec (multiple headers with 726 * the same name are only allowed for pure comma-separated lists, see 727 * rfc2616 sec 4.2). 728 * 729 * We support both approaches anyway 730 */ 731 static int 732 http_parse_authenticate(const char *cp, http_auth_challenges_t *cs) 733 { 734 int ret = -1; 735 http_header_lex_t lex; 736 char *key = malloc(strlen(cp) + 1); 737 char *value = malloc(strlen(cp) + 1); 738 char *buf = malloc(strlen(cp) + 1); 739 740 if (key == NULL || value == NULL || buf == NULL) { 741 fetch_syserr(); 742 goto out; 743 } 744 745 /* In any case we've seen the header and we set the valid bit */ 746 cs->valid = 1; 747 748 /* Need word first */ 749 lex = http_header_lex(&cp, key); 750 if (lex != HTTPHL_WORD) 751 goto out; 752 753 /* Loop on challenges */ 754 for (; cs->count < MAX_CHALLENGES; cs->count++) { 755 cs->challenges[cs->count] = 756 malloc(sizeof(http_auth_challenge_t)); 757 if (cs->challenges[cs->count] == NULL) { 758 fetch_syserr(); 759 goto out; 760 } 761 init_http_auth_challenge(cs->challenges[cs->count]); 762 if (!strcasecmp(key, "basic")) { 763 cs->challenges[cs->count]->scheme = HTTPAS_BASIC; 764 } else if (!strcasecmp(key, "digest")) { 765 cs->challenges[cs->count]->scheme = HTTPAS_DIGEST; 766 } else { 767 cs->challenges[cs->count]->scheme = HTTPAS_UNKNOWN; 768 /* 769 * Continue parsing as basic or digest may 770 * follow, and the syntax is the same for 771 * all. We'll just ignore this one when 772 * looking at the list 773 */ 774 } 775 776 /* Loop on attributes */ 777 for (;;) { 778 /* Key */ 779 lex = http_header_lex(&cp, key); 780 if (lex != HTTPHL_WORD) 781 goto out; 782 783 /* Equal sign */ 784 lex = http_header_lex(&cp, buf); 785 if (lex != '=') 786 goto out; 787 788 /* Value */ 789 lex = http_header_lex(&cp, value); 790 if (lex != HTTPHL_WORD && lex != HTTPHL_STRING) 791 goto out; 792 793 if (!strcasecmp(key, "realm")) 794 cs->challenges[cs->count]->realm = 795 strdup(value); 796 else if (!strcasecmp(key, "qop")) 797 cs->challenges[cs->count]->qop = 798 strdup(value); 799 else if (!strcasecmp(key, "nonce")) 800 cs->challenges[cs->count]->nonce = 801 strdup(value); 802 else if (!strcasecmp(key, "opaque")) 803 cs->challenges[cs->count]->opaque = 804 strdup(value); 805 else if (!strcasecmp(key, "algorithm")) 806 cs->challenges[cs->count]->algo = 807 strdup(value); 808 else if (!strcasecmp(key, "stale")) 809 cs->challenges[cs->count]->stale = 810 strcasecmp(value, "no"); 811 /* Else ignore unknown attributes */ 812 813 /* Comma or Next challenge or End */ 814 lex = http_header_lex(&cp, key); 815 /* 816 * If we get a word here, this is the beginning of the 817 * next challenge. Break the attributes loop 818 */ 819 if (lex == HTTPHL_WORD) 820 break; 821 822 if (lex == HTTPHL_END) { 823 /* End while looking for ',' is normal exit */ 824 cs->count++; 825 ret = 0; 826 goto out; 827 } 828 /* Anything else is an error */ 829 if (lex != ',') 830 goto out; 831 832 } /* End attributes loop */ 833 } /* End challenge loop */ 834 835 /* 836 * Challenges max count exceeded. This really can't happen 837 * with normal data, something's fishy -> error 838 */ 839 840 out: 841 if (key) 842 free(key); 843 if (value) 844 free(value); 845 if (buf) 846 free(buf); 847 return (ret); 848 } 849 850 851 /* 852 * Parse a last-modified header 853 */ 854 static int 855 http_parse_mtime(const char *p, time_t *mtime) 856 { 857 char locale[64], *r; 858 struct tm tm; 859 860 strncpy(locale, setlocale(LC_TIME, NULL), sizeof(locale)); 861 setlocale(LC_TIME, "C"); 862 r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm); 863 /* XXX should add support for date-2 and date-3 */ 864 setlocale(LC_TIME, locale); 865 if (r == NULL) 866 return (-1); 867 DEBUG(fprintf(stderr, "last modified: [%04d-%02d-%02d " 868 "%02d:%02d:%02d]\n", 869 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 870 tm.tm_hour, tm.tm_min, tm.tm_sec)); 871 *mtime = timegm(&tm); 872 return (0); 873 } 874 875 /* 876 * Parse a content-length header 877 */ 878 static int 879 http_parse_length(const char *p, off_t *length) 880 { 881 off_t len; 882 883 for (len = 0; *p && isdigit((unsigned char)*p); ++p) 884 len = len * 10 + (*p - '0'); 885 if (*p) 886 return (-1); 887 DEBUG(fprintf(stderr, "content length: [%lld]\n", 888 (long long)len)); 889 *length = len; 890 return (0); 891 } 892 893 /* 894 * Parse a content-range header 895 */ 896 static int 897 http_parse_range(const char *p, off_t *offset, off_t *length, off_t *size) 898 { 899 off_t first, last, len; 900 901 if (strncasecmp(p, "bytes ", 6) != 0) 902 return (-1); 903 p += 6; 904 if (*p == '*') { 905 first = last = -1; 906 ++p; 907 } else { 908 for (first = 0; *p && isdigit((unsigned char)*p); ++p) 909 first = first * 10 + *p - '0'; 910 if (*p != '-') 911 return (-1); 912 for (last = 0, ++p; *p && isdigit((unsigned char)*p); ++p) 913 last = last * 10 + *p - '0'; 914 } 915 if (first > last || *p != '/') 916 return (-1); 917 for (len = 0, ++p; *p && isdigit((unsigned char)*p); ++p) 918 len = len * 10 + *p - '0'; 919 if (*p || len < last - first + 1) 920 return (-1); 921 if (first == -1) { 922 DEBUG(fprintf(stderr, "content range: [*/%lld]\n", 923 (long long)len)); 924 *length = 0; 925 } else { 926 DEBUG(fprintf(stderr, "content range: [%lld-%lld/%lld]\n", 927 (long long)first, (long long)last, (long long)len)); 928 *length = last - first + 1; 929 } 930 *offset = first; 931 *size = len; 932 return (0); 933 } 934 935 936 /***************************************************************************** 937 * Helper functions for authorization 938 */ 939 940 /* 941 * Base64 encoding 942 */ 943 static char * 944 http_base64(const char *src) 945 { 946 static const char base64[] = 947 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 948 "abcdefghijklmnopqrstuvwxyz" 949 "0123456789+/"; 950 char *str, *dst; 951 size_t l; 952 int t, r; 953 954 l = strlen(src); 955 if ((str = malloc(((l + 2) / 3) * 4 + 1)) == NULL) 956 return (NULL); 957 dst = str; 958 r = 0; 959 960 while (l >= 3) { 961 t = (src[0] << 16) | (src[1] << 8) | src[2]; 962 dst[0] = base64[(t >> 18) & 0x3f]; 963 dst[1] = base64[(t >> 12) & 0x3f]; 964 dst[2] = base64[(t >> 6) & 0x3f]; 965 dst[3] = base64[(t >> 0) & 0x3f]; 966 src += 3; l -= 3; 967 dst += 4; r += 4; 968 } 969 970 switch (l) { 971 case 2: 972 t = (src[0] << 16) | (src[1] << 8); 973 dst[0] = base64[(t >> 18) & 0x3f]; 974 dst[1] = base64[(t >> 12) & 0x3f]; 975 dst[2] = base64[(t >> 6) & 0x3f]; 976 dst[3] = '='; 977 dst += 4; 978 r += 4; 979 break; 980 case 1: 981 t = src[0] << 16; 982 dst[0] = base64[(t >> 18) & 0x3f]; 983 dst[1] = base64[(t >> 12) & 0x3f]; 984 dst[2] = dst[3] = '='; 985 dst += 4; 986 r += 4; 987 break; 988 case 0: 989 break; 990 } 991 992 *dst = 0; 993 return (str); 994 } 995 996 997 /* 998 * Extract authorization parameters from environment value. 999 * The value is like scheme:realm:user:pass 1000 */ 1001 typedef struct { 1002 char *scheme; 1003 char *realm; 1004 char *user; 1005 char *password; 1006 } http_auth_params_t; 1007 1008 static void 1009 init_http_auth_params(http_auth_params_t *s) 1010 { 1011 s->scheme = s->realm = s->user = s->password = 0; 1012 } 1013 1014 static void 1015 clean_http_auth_params(http_auth_params_t *s) 1016 { 1017 if (s->scheme) 1018 free(s->scheme); 1019 if (s->realm) 1020 free(s->realm); 1021 if (s->user) 1022 free(s->user); 1023 if (s->password) 1024 free(s->password); 1025 init_http_auth_params(s); 1026 } 1027 1028 static int 1029 http_authfromenv(const char *p, http_auth_params_t *parms) 1030 { 1031 int ret = -1; 1032 char *v, *ve; 1033 char *str = strdup(p); 1034 1035 if (str == NULL) { 1036 fetch_syserr(); 1037 return (-1); 1038 } 1039 v = str; 1040 1041 if ((ve = strchr(v, ':')) == NULL) 1042 goto out; 1043 1044 *ve = 0; 1045 if ((parms->scheme = strdup(v)) == NULL) { 1046 fetch_syserr(); 1047 goto out; 1048 } 1049 v = ve + 1; 1050 1051 if ((ve = strchr(v, ':')) == NULL) 1052 goto out; 1053 1054 *ve = 0; 1055 if ((parms->realm = strdup(v)) == NULL) { 1056 fetch_syserr(); 1057 goto out; 1058 } 1059 v = ve + 1; 1060 1061 if ((ve = strchr(v, ':')) == NULL) 1062 goto out; 1063 1064 *ve = 0; 1065 if ((parms->user = strdup(v)) == NULL) { 1066 fetch_syserr(); 1067 goto out; 1068 } 1069 v = ve + 1; 1070 1071 1072 if ((parms->password = strdup(v)) == NULL) { 1073 fetch_syserr(); 1074 goto out; 1075 } 1076 ret = 0; 1077 out: 1078 if (ret == -1) 1079 clean_http_auth_params(parms); 1080 if (str) 1081 free(str); 1082 return (ret); 1083 } 1084 1085 1086 /* 1087 * Digest response: the code to compute the digest is taken from the 1088 * sample implementation in RFC2616 1089 */ 1090 #define IN 1091 #define OUT 1092 1093 #define HASHLEN 16 1094 typedef char HASH[HASHLEN]; 1095 #define HASHHEXLEN 32 1096 typedef char HASHHEX[HASHHEXLEN+1]; 1097 1098 static const char *hexchars = "0123456789abcdef"; 1099 static void 1100 CvtHex(IN HASH Bin, OUT HASHHEX Hex) 1101 { 1102 unsigned short i; 1103 unsigned char j; 1104 1105 for (i = 0; i < HASHLEN; i++) { 1106 j = (Bin[i] >> 4) & 0xf; 1107 Hex[i*2] = hexchars[j]; 1108 j = Bin[i] & 0xf; 1109 Hex[i*2+1] = hexchars[j]; 1110 }; 1111 Hex[HASHHEXLEN] = '\0'; 1112 }; 1113 1114 /* calculate H(A1) as per spec */ 1115 static void 1116 DigestCalcHA1( 1117 IN char * pszAlg, 1118 IN char * pszUserName, 1119 IN char * pszRealm, 1120 IN char * pszPassword, 1121 IN char * pszNonce, 1122 IN char * pszCNonce, 1123 OUT HASHHEX SessionKey 1124 ) 1125 { 1126 MD5_CTX Md5Ctx; 1127 HASH HA1; 1128 1129 MD5Init(&Md5Ctx); 1130 MD5Update(&Md5Ctx, pszUserName, strlen(pszUserName)); 1131 MD5Update(&Md5Ctx, ":", 1); 1132 MD5Update(&Md5Ctx, pszRealm, strlen(pszRealm)); 1133 MD5Update(&Md5Ctx, ":", 1); 1134 MD5Update(&Md5Ctx, pszPassword, strlen(pszPassword)); 1135 MD5Final(HA1, &Md5Ctx); 1136 if (strcasecmp(pszAlg, "md5-sess") == 0) { 1137 1138 MD5Init(&Md5Ctx); 1139 MD5Update(&Md5Ctx, HA1, HASHLEN); 1140 MD5Update(&Md5Ctx, ":", 1); 1141 MD5Update(&Md5Ctx, pszNonce, strlen(pszNonce)); 1142 MD5Update(&Md5Ctx, ":", 1); 1143 MD5Update(&Md5Ctx, pszCNonce, strlen(pszCNonce)); 1144 MD5Final(HA1, &Md5Ctx); 1145 }; 1146 CvtHex(HA1, SessionKey); 1147 } 1148 1149 /* calculate request-digest/response-digest as per HTTP Digest spec */ 1150 static void 1151 DigestCalcResponse( 1152 IN HASHHEX HA1, /* H(A1) */ 1153 IN char * pszNonce, /* nonce from server */ 1154 IN char * pszNonceCount, /* 8 hex digits */ 1155 IN char * pszCNonce, /* client nonce */ 1156 IN char * pszQop, /* qop-value: "", "auth", "auth-int" */ 1157 IN char * pszMethod, /* method from the request */ 1158 IN char * pszDigestUri, /* requested URL */ 1159 IN HASHHEX HEntity, /* H(entity body) if qop="auth-int" */ 1160 OUT HASHHEX Response /* request-digest or response-digest */ 1161 ) 1162 { 1163 /* DEBUG(fprintf(stderr, 1164 "Calc: HA1[%s] Nonce[%s] qop[%s] method[%s] URI[%s]\n", 1165 HA1, pszNonce, pszQop, pszMethod, pszDigestUri));*/ 1166 MD5_CTX Md5Ctx; 1167 HASH HA2; 1168 HASH RespHash; 1169 HASHHEX HA2Hex; 1170 1171 // calculate H(A2) 1172 MD5Init(&Md5Ctx); 1173 MD5Update(&Md5Ctx, pszMethod, strlen(pszMethod)); 1174 MD5Update(&Md5Ctx, ":", 1); 1175 MD5Update(&Md5Ctx, pszDigestUri, strlen(pszDigestUri)); 1176 if (strcasecmp(pszQop, "auth-int") == 0) { 1177 MD5Update(&Md5Ctx, ":", 1); 1178 MD5Update(&Md5Ctx, HEntity, HASHHEXLEN); 1179 }; 1180 MD5Final(HA2, &Md5Ctx); 1181 CvtHex(HA2, HA2Hex); 1182 1183 // calculate response 1184 MD5Init(&Md5Ctx); 1185 MD5Update(&Md5Ctx, HA1, HASHHEXLEN); 1186 MD5Update(&Md5Ctx, ":", 1); 1187 MD5Update(&Md5Ctx, pszNonce, strlen(pszNonce)); 1188 MD5Update(&Md5Ctx, ":", 1); 1189 if (*pszQop) { 1190 MD5Update(&Md5Ctx, pszNonceCount, strlen(pszNonceCount)); 1191 MD5Update(&Md5Ctx, ":", 1); 1192 MD5Update(&Md5Ctx, pszCNonce, strlen(pszCNonce)); 1193 MD5Update(&Md5Ctx, ":", 1); 1194 MD5Update(&Md5Ctx, pszQop, strlen(pszQop)); 1195 MD5Update(&Md5Ctx, ":", 1); 1196 }; 1197 MD5Update(&Md5Ctx, HA2Hex, HASHHEXLEN); 1198 MD5Final(RespHash, &Md5Ctx); 1199 CvtHex(RespHash, Response); 1200 } 1201 1202 /* 1203 * Generate/Send a Digest authorization header 1204 * This looks like: [Proxy-]Authorization: credentials 1205 * 1206 * credentials = "Digest" digest-response 1207 * digest-response = 1#( username | realm | nonce | digest-uri 1208 * | response | [ algorithm ] | [cnonce] | 1209 * [opaque] | [message-qop] | 1210 * [nonce-count] | [auth-param] ) 1211 * username = "username" "=" username-value 1212 * username-value = quoted-string 1213 * digest-uri = "uri" "=" digest-uri-value 1214 * digest-uri-value = request-uri ; As specified by HTTP/1.1 1215 * message-qop = "qop" "=" qop-value 1216 * cnonce = "cnonce" "=" cnonce-value 1217 * cnonce-value = nonce-value 1218 * nonce-count = "nc" "=" nc-value 1219 * nc-value = 8LHEX 1220 * response = "response" "=" request-digest 1221 * request-digest = <"> 32LHEX <"> 1222 */ 1223 static int 1224 http_digest_auth(conn_t *conn, const char *hdr, http_auth_challenge_t *c, 1225 http_auth_params_t *parms, struct url *url) 1226 { 1227 int r; 1228 char noncecount[10]; 1229 char cnonce[40]; 1230 char *options = 0; 1231 1232 if (!c->realm || !c->nonce) { 1233 DEBUG(fprintf(stderr, "realm/nonce not set in challenge\n")); 1234 return(-1); 1235 } 1236 if (!c->algo) 1237 c->algo = strdup(""); 1238 1239 if (asprintf(&options, "%s%s%s%s", 1240 *c->algo? ",algorithm=" : "", c->algo, 1241 c->opaque? ",opaque=" : "", c->opaque?c->opaque:"")== -1) 1242 return (-1); 1243 1244 if (!c->qop) { 1245 c->qop = strdup(""); 1246 *noncecount = 0; 1247 *cnonce = 0; 1248 } else { 1249 c->nc++; 1250 sprintf(noncecount, "%08x", c->nc); 1251 /* We don't try very hard with the cnonce ... */ 1252 sprintf(cnonce, "%x%lx", getpid(), (unsigned long)time(0)); 1253 } 1254 1255 HASHHEX HA1; 1256 DigestCalcHA1(c->algo, parms->user, c->realm, 1257 parms->password, c->nonce, cnonce, HA1); 1258 DEBUG(fprintf(stderr, "HA1: [%s]\n", HA1)); 1259 HASHHEX digest; 1260 DigestCalcResponse(HA1, c->nonce, noncecount, cnonce, c->qop, 1261 "GET", url->doc, "", digest); 1262 1263 if (c->qop[0]) { 1264 r = http_cmd(conn, "%s: Digest username=\"%s\",realm=\"%s\"," 1265 "nonce=\"%s\",uri=\"%s\",response=\"%s\"," 1266 "qop=\"auth\", cnonce=\"%s\", nc=%s%s", 1267 hdr, parms->user, c->realm, 1268 c->nonce, url->doc, digest, 1269 cnonce, noncecount, options); 1270 } else { 1271 r = http_cmd(conn, "%s: Digest username=\"%s\",realm=\"%s\"," 1272 "nonce=\"%s\",uri=\"%s\",response=\"%s\"%s", 1273 hdr, parms->user, c->realm, 1274 c->nonce, url->doc, digest, options); 1275 } 1276 if (options) 1277 free(options); 1278 return (r); 1279 } 1280 1281 /* 1282 * Encode username and password 1283 */ 1284 static int 1285 http_basic_auth(conn_t *conn, const char *hdr, const char *usr, const char *pwd) 1286 { 1287 char *upw, *auth; 1288 int r; 1289 1290 DEBUG(fprintf(stderr, "basic: usr: [%s]\n", usr)); 1291 DEBUG(fprintf(stderr, "basic: pwd: [%s]\n", pwd)); 1292 if (asprintf(&upw, "%s:%s", usr, pwd) == -1) 1293 return (-1); 1294 auth = http_base64(upw); 1295 free(upw); 1296 if (auth == NULL) 1297 return (-1); 1298 r = http_cmd(conn, "%s: Basic %s", hdr, auth); 1299 free(auth); 1300 return (r); 1301 } 1302 1303 /* 1304 * Chose the challenge to answer and call the appropriate routine to 1305 * produce the header. 1306 */ 1307 static int 1308 http_authorize(conn_t *conn, const char *hdr, http_auth_challenges_t *cs, 1309 http_auth_params_t *parms, struct url *url) 1310 { 1311 http_auth_challenge_t *basic = NULL; 1312 http_auth_challenge_t *digest = NULL; 1313 int i; 1314 1315 /* If user or pass are null we're not happy */ 1316 if (!parms->user || !parms->password) { 1317 DEBUG(fprintf(stderr, "NULL usr or pass\n")); 1318 return (-1); 1319 } 1320 1321 /* Look for a Digest and a Basic challenge */ 1322 for (i = 0; i < cs->count; i++) { 1323 if (cs->challenges[i]->scheme == HTTPAS_BASIC) 1324 basic = cs->challenges[i]; 1325 if (cs->challenges[i]->scheme == HTTPAS_DIGEST) 1326 digest = cs->challenges[i]; 1327 } 1328 1329 /* Error if "Digest" was specified and there is no Digest challenge */ 1330 if (!digest && (parms->scheme && 1331 !strcasecmp(parms->scheme, "digest"))) { 1332 DEBUG(fprintf(stderr, 1333 "Digest auth in env, not supported by peer\n")); 1334 return (-1); 1335 } 1336 /* 1337 * If "basic" was specified in the environment, or there is no Digest 1338 * challenge, do the basic thing. Don't need a challenge for this, 1339 * so no need to check basic!=NULL 1340 */ 1341 if (!digest || (parms->scheme && !strcasecmp(parms->scheme,"basic"))) 1342 return (http_basic_auth(conn,hdr,parms->user,parms->password)); 1343 1344 /* Else, prefer digest. We just checked that it's not NULL */ 1345 return (http_digest_auth(conn, hdr, digest, parms, url)); 1346 } 1347 1348 /***************************************************************************** 1349 * Helper functions for connecting to a server or proxy 1350 */ 1351 1352 /* 1353 * Connect to the correct HTTP server or proxy. 1354 */ 1355 static conn_t * 1356 http_connect(struct url *URL, struct url *purl, const char *flags) 1357 { 1358 conn_t *conn; 1359 int verbose; 1360 int af, val; 1361 1362 #ifdef INET6 1363 af = AF_UNSPEC; 1364 #else 1365 af = AF_INET; 1366 #endif 1367 1368 verbose = CHECK_FLAG('v'); 1369 if (CHECK_FLAG('4')) 1370 af = AF_INET; 1371 #ifdef INET6 1372 else if (CHECK_FLAG('6')) 1373 af = AF_INET6; 1374 #endif 1375 1376 if (purl && strcasecmp(URL->scheme, SCHEME_HTTPS) != 0) { 1377 URL = purl; 1378 } else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) { 1379 /* can't talk http to an ftp server */ 1380 /* XXX should set an error code */ 1381 return (NULL); 1382 } 1383 1384 if ((conn = fetch_connect(URL->host, URL->port, af, verbose)) == NULL) 1385 /* fetch_connect() has already set an error code */ 1386 return (NULL); 1387 if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 && 1388 fetch_ssl(conn, verbose) == -1) { 1389 fetch_close(conn); 1390 /* grrr */ 1391 errno = EAUTH; 1392 fetch_syserr(); 1393 return (NULL); 1394 } 1395 1396 val = 1; 1397 setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, sizeof(val)); 1398 1399 return (conn); 1400 } 1401 1402 static struct url * 1403 http_get_proxy(struct url * url, const char *flags) 1404 { 1405 struct url *purl; 1406 char *p; 1407 1408 if (flags != NULL && strchr(flags, 'd') != NULL) 1409 return (NULL); 1410 if (fetch_no_proxy_match(url->host)) 1411 return (NULL); 1412 if (((p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 1413 *p && (purl = fetchParseURL(p))) { 1414 if (!*purl->scheme) 1415 strcpy(purl->scheme, SCHEME_HTTP); 1416 if (!purl->port) 1417 purl->port = fetch_default_proxy_port(purl->scheme); 1418 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 1419 return (purl); 1420 fetchFreeURL(purl); 1421 } 1422 return (NULL); 1423 } 1424 1425 static void 1426 http_print_html(FILE *out, FILE *in) 1427 { 1428 size_t len; 1429 char *line, *p, *q; 1430 int comment, tag; 1431 1432 comment = tag = 0; 1433 while ((line = fgetln(in, &len)) != NULL) { 1434 while (len && isspace((unsigned char)line[len - 1])) 1435 --len; 1436 for (p = q = line; q < line + len; ++q) { 1437 if (comment && *q == '-') { 1438 if (q + 2 < line + len && 1439 strcmp(q, "-->") == 0) { 1440 tag = comment = 0; 1441 q += 2; 1442 } 1443 } else if (tag && !comment && *q == '>') { 1444 p = q + 1; 1445 tag = 0; 1446 } else if (!tag && *q == '<') { 1447 if (q > p) 1448 fwrite(p, q - p, 1, out); 1449 tag = 1; 1450 if (q + 3 < line + len && 1451 strcmp(q, "<!--") == 0) { 1452 comment = 1; 1453 q += 3; 1454 } 1455 } 1456 } 1457 if (!tag && q > p) 1458 fwrite(p, q - p, 1, out); 1459 fputc('\n', out); 1460 } 1461 } 1462 1463 1464 /***************************************************************************** 1465 * Core 1466 */ 1467 1468 /* 1469 * Send a request and process the reply 1470 * 1471 * XXX This function is way too long, the do..while loop should be split 1472 * XXX off into a separate function. 1473 */ 1474 FILE * 1475 http_request(struct url *URL, const char *op, struct url_stat *us, 1476 struct url *purl, const char *flags) 1477 { 1478 char timebuf[80]; 1479 char hbuf[MAXHOSTNAMELEN + 7], *host; 1480 conn_t *conn; 1481 struct url *url, *new; 1482 int chunked, direct, ims, noredirect, verbose; 1483 int e, i, n, val; 1484 off_t offset, clength, length, size; 1485 time_t mtime; 1486 const char *p; 1487 FILE *f; 1488 hdr_t h; 1489 struct tm *timestruct; 1490 http_headerbuf_t headerbuf; 1491 http_auth_challenges_t server_challenges; 1492 http_auth_challenges_t proxy_challenges; 1493 1494 /* The following calls don't allocate anything */ 1495 init_http_headerbuf(&headerbuf); 1496 init_http_auth_challenges(&server_challenges); 1497 init_http_auth_challenges(&proxy_challenges); 1498 1499 direct = CHECK_FLAG('d'); 1500 noredirect = CHECK_FLAG('A'); 1501 verbose = CHECK_FLAG('v'); 1502 ims = CHECK_FLAG('i'); 1503 1504 if (direct && purl) { 1505 fetchFreeURL(purl); 1506 purl = NULL; 1507 } 1508 1509 /* try the provided URL first */ 1510 url = URL; 1511 1512 /* if the A flag is set, we only get one try */ 1513 n = noredirect ? 1 : MAX_REDIRECT; 1514 i = 0; 1515 1516 e = HTTP_PROTOCOL_ERROR; 1517 do { 1518 new = NULL; 1519 chunked = 0; 1520 offset = 0; 1521 clength = -1; 1522 length = -1; 1523 size = -1; 1524 mtime = 0; 1525 1526 /* check port */ 1527 if (!url->port) 1528 url->port = fetch_default_port(url->scheme); 1529 1530 /* were we redirected to an FTP URL? */ 1531 if (purl == NULL && strcmp(url->scheme, SCHEME_FTP) == 0) { 1532 if (strcmp(op, "GET") == 0) 1533 return (ftp_request(url, "RETR", us, purl, flags)); 1534 else if (strcmp(op, "HEAD") == 0) 1535 return (ftp_request(url, "STAT", us, purl, flags)); 1536 } 1537 1538 /* connect to server or proxy */ 1539 if ((conn = http_connect(url, purl, flags)) == NULL) 1540 goto ouch; 1541 1542 host = url->host; 1543 #ifdef INET6 1544 if (strchr(url->host, ':')) { 1545 snprintf(hbuf, sizeof(hbuf), "[%s]", url->host); 1546 host = hbuf; 1547 } 1548 #endif 1549 if (url->port != fetch_default_port(url->scheme)) { 1550 if (host != hbuf) { 1551 strcpy(hbuf, host); 1552 host = hbuf; 1553 } 1554 snprintf(hbuf + strlen(hbuf), 1555 sizeof(hbuf) - strlen(hbuf), ":%d", url->port); 1556 } 1557 1558 /* send request */ 1559 if (verbose) 1560 fetch_info("requesting %s://%s%s", 1561 url->scheme, host, url->doc); 1562 if (purl) { 1563 http_cmd(conn, "%s %s://%s%s HTTP/1.1", 1564 op, url->scheme, host, url->doc); 1565 } else { 1566 http_cmd(conn, "%s %s HTTP/1.1", 1567 op, url->doc); 1568 } 1569 1570 if (ims && url->ims_time) { 1571 timestruct = gmtime((time_t *)&url->ims_time); 1572 (void)strftime(timebuf, 80, "%a, %d %b %Y %T GMT", 1573 timestruct); 1574 if (verbose) 1575 fetch_info("If-Modified-Since: %s", timebuf); 1576 http_cmd(conn, "If-Modified-Since: %s", timebuf); 1577 } 1578 /* virtual host */ 1579 http_cmd(conn, "Host: %s", host); 1580 1581 /* 1582 * Proxy authorization: we only send auth after we received 1583 * a 407 error. We do not first try basic anyway (changed 1584 * when support was added for digest-auth) 1585 */ 1586 if (purl && proxy_challenges.valid) { 1587 http_auth_params_t aparams; 1588 init_http_auth_params(&aparams); 1589 if (*purl->user || *purl->pwd) { 1590 aparams.user = purl->user ? 1591 strdup(purl->user) : strdup(""); 1592 aparams.password = purl->pwd? 1593 strdup(purl->pwd) : strdup(""); 1594 } else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL && 1595 *p != '\0') { 1596 if (http_authfromenv(p, &aparams) < 0) { 1597 http_seterr(HTTP_NEED_PROXY_AUTH); 1598 goto ouch; 1599 } 1600 } 1601 http_authorize(conn, "Proxy-Authorization", 1602 &proxy_challenges, &aparams, url); 1603 clean_http_auth_params(&aparams); 1604 } 1605 1606 /* 1607 * Server authorization: we never send "a priori" 1608 * Basic auth, which used to be done if user/pass were 1609 * set in the url. This would be weird because we'd send the 1610 * password in the clear even if Digest is finally to be 1611 * used (it would have made more sense for the 1612 * pre-digest version to do this when Basic was specified 1613 * in the environment) 1614 */ 1615 if (server_challenges.valid) { 1616 http_auth_params_t aparams; 1617 init_http_auth_params(&aparams); 1618 if (*url->user || *url->pwd) { 1619 aparams.user = url->user ? 1620 strdup(url->user) : strdup(""); 1621 aparams.password = url->pwd ? 1622 strdup(url->pwd) : strdup(""); 1623 } else if ((p = getenv("HTTP_AUTH")) != NULL && 1624 *p != '\0') { 1625 if (http_authfromenv(p, &aparams) < 0) { 1626 http_seterr(HTTP_NEED_AUTH); 1627 goto ouch; 1628 } 1629 } else if (fetchAuthMethod && 1630 fetchAuthMethod(url) == 0) { 1631 aparams.user = url->user ? 1632 strdup(url->user) : strdup(""); 1633 aparams.password = url->pwd ? 1634 strdup(url->pwd) : strdup(""); 1635 } else { 1636 http_seterr(HTTP_NEED_AUTH); 1637 goto ouch; 1638 } 1639 http_authorize(conn, "Authorization", 1640 &server_challenges, &aparams, url); 1641 clean_http_auth_params(&aparams); 1642 } 1643 1644 /* other headers */ 1645 if ((p = getenv("HTTP_REFERER")) != NULL && *p != '\0') { 1646 if (strcasecmp(p, "auto") == 0) 1647 http_cmd(conn, "Referer: %s://%s%s", 1648 url->scheme, host, url->doc); 1649 else 1650 http_cmd(conn, "Referer: %s", p); 1651 } 1652 if ((p = getenv("HTTP_USER_AGENT")) != NULL && *p != '\0') 1653 http_cmd(conn, "User-Agent: %s", p); 1654 else 1655 http_cmd(conn, "User-Agent: %s " _LIBFETCH_VER, getprogname()); 1656 if (url->offset > 0) 1657 http_cmd(conn, "Range: bytes=%lld-", (long long)url->offset); 1658 http_cmd(conn, "Connection: close"); 1659 http_cmd(conn, ""); 1660 1661 /* 1662 * Force the queued request to be dispatched. Normally, one 1663 * would do this with shutdown(2) but squid proxies can be 1664 * configured to disallow such half-closed connections. To 1665 * be compatible with such configurations, fiddle with socket 1666 * options to force the pending data to be written. 1667 */ 1668 val = 0; 1669 setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, 1670 sizeof(val)); 1671 val = 1; 1672 setsockopt(conn->sd, IPPROTO_TCP, TCP_NODELAY, &val, 1673 sizeof(val)); 1674 1675 /* get reply */ 1676 switch (http_get_reply(conn)) { 1677 case HTTP_OK: 1678 case HTTP_PARTIAL: 1679 case HTTP_NOT_MODIFIED: 1680 /* fine */ 1681 break; 1682 case HTTP_MOVED_PERM: 1683 case HTTP_MOVED_TEMP: 1684 case HTTP_SEE_OTHER: 1685 /* 1686 * Not so fine, but we still have to read the 1687 * headers to get the new location. 1688 */ 1689 break; 1690 case HTTP_NEED_AUTH: 1691 if (server_challenges.valid) { 1692 /* 1693 * We already sent out authorization code, 1694 * so there's nothing more we can do. 1695 */ 1696 http_seterr(conn->err); 1697 goto ouch; 1698 } 1699 /* try again, but send the password this time */ 1700 if (verbose) 1701 fetch_info("server requires authorization"); 1702 break; 1703 case HTTP_NEED_PROXY_AUTH: 1704 if (proxy_challenges.valid) { 1705 /* 1706 * We already sent our proxy 1707 * authorization code, so there's 1708 * nothing more we can do. */ 1709 http_seterr(conn->err); 1710 goto ouch; 1711 } 1712 /* try again, but send the password this time */ 1713 if (verbose) 1714 fetch_info("proxy requires authorization"); 1715 break; 1716 case HTTP_BAD_RANGE: 1717 /* 1718 * This can happen if we ask for 0 bytes because 1719 * we already have the whole file. Consider this 1720 * a success for now, and check sizes later. 1721 */ 1722 break; 1723 case HTTP_PROTOCOL_ERROR: 1724 /* fall through */ 1725 case -1: 1726 fetch_syserr(); 1727 goto ouch; 1728 default: 1729 http_seterr(conn->err); 1730 if (!verbose) 1731 goto ouch; 1732 /* fall through so we can get the full error message */ 1733 } 1734 1735 /* get headers. http_next_header expects one line readahead */ 1736 if (fetch_getln(conn) == -1) { 1737 fetch_syserr(); 1738 goto ouch; 1739 } 1740 do { 1741 switch ((h = http_next_header(conn, &headerbuf, &p))) { 1742 case hdr_syserror: 1743 fetch_syserr(); 1744 goto ouch; 1745 case hdr_error: 1746 http_seterr(HTTP_PROTOCOL_ERROR); 1747 goto ouch; 1748 case hdr_content_length: 1749 http_parse_length(p, &clength); 1750 break; 1751 case hdr_content_range: 1752 http_parse_range(p, &offset, &length, &size); 1753 break; 1754 case hdr_last_modified: 1755 http_parse_mtime(p, &mtime); 1756 break; 1757 case hdr_location: 1758 if (!HTTP_REDIRECT(conn->err)) 1759 break; 1760 if (new) 1761 free(new); 1762 if (verbose) 1763 fetch_info("%d redirect to %s", conn->err, p); 1764 if (*p == '/') 1765 /* absolute path */ 1766 new = fetchMakeURL(url->scheme, url->host, url->port, p, 1767 url->user, url->pwd); 1768 else 1769 new = fetchParseURL(p); 1770 if (new == NULL) { 1771 /* XXX should set an error code */ 1772 DEBUG(fprintf(stderr, "failed to parse new URL\n")); 1773 goto ouch; 1774 } 1775 if (!*new->user && !*new->pwd) { 1776 strcpy(new->user, url->user); 1777 strcpy(new->pwd, url->pwd); 1778 } 1779 new->offset = url->offset; 1780 new->length = url->length; 1781 break; 1782 case hdr_transfer_encoding: 1783 /* XXX weak test*/ 1784 chunked = (strcasecmp(p, "chunked") == 0); 1785 break; 1786 case hdr_www_authenticate: 1787 if (conn->err != HTTP_NEED_AUTH) 1788 break; 1789 if (http_parse_authenticate(p, &server_challenges) == 0) 1790 ++n; 1791 break; 1792 case hdr_proxy_authenticate: 1793 if (conn->err != HTTP_NEED_PROXY_AUTH) 1794 break; 1795 if (http_parse_authenticate(p, &proxy_challenges) == 0) 1796 ++n; 1797 break; 1798 case hdr_end: 1799 /* fall through */ 1800 case hdr_unknown: 1801 /* ignore */ 1802 break; 1803 } 1804 } while (h > hdr_end); 1805 1806 /* we need to provide authentication */ 1807 if (conn->err == HTTP_NEED_AUTH || 1808 conn->err == HTTP_NEED_PROXY_AUTH) { 1809 e = conn->err; 1810 if ((conn->err == HTTP_NEED_AUTH && 1811 !server_challenges.valid) || 1812 (conn->err == HTTP_NEED_PROXY_AUTH && 1813 !proxy_challenges.valid)) { 1814 /* 401/7 but no www/proxy-authenticate ?? */ 1815 DEBUG(fprintf(stderr, "401/7 and no auth header\n")); 1816 goto ouch; 1817 } 1818 fetch_close(conn); 1819 conn = NULL; 1820 continue; 1821 } 1822 1823 /* requested range not satisfiable */ 1824 if (conn->err == HTTP_BAD_RANGE) { 1825 if (url->offset == size && url->length == 0) { 1826 /* asked for 0 bytes; fake it */ 1827 offset = url->offset; 1828 clength = -1; 1829 conn->err = HTTP_OK; 1830 break; 1831 } else { 1832 http_seterr(conn->err); 1833 goto ouch; 1834 } 1835 } 1836 1837 /* we have a hit or an error */ 1838 if (conn->err == HTTP_OK 1839 || conn->err == HTTP_NOT_MODIFIED 1840 || conn->err == HTTP_PARTIAL 1841 || HTTP_ERROR(conn->err)) 1842 break; 1843 1844 /* all other cases: we got a redirect */ 1845 e = conn->err; 1846 clean_http_auth_challenges(&server_challenges); 1847 fetch_close(conn); 1848 conn = NULL; 1849 if (!new) { 1850 DEBUG(fprintf(stderr, "redirect with no new location\n")); 1851 break; 1852 } 1853 if (url != URL) 1854 fetchFreeURL(url); 1855 url = new; 1856 } while (++i < n); 1857 1858 /* we failed, or ran out of retries */ 1859 if (conn == NULL) { 1860 http_seterr(e); 1861 goto ouch; 1862 } 1863 1864 DEBUG(fprintf(stderr, "offset %lld, length %lld," 1865 " size %lld, clength %lld\n", 1866 (long long)offset, (long long)length, 1867 (long long)size, (long long)clength)); 1868 1869 if (conn->err == HTTP_NOT_MODIFIED) { 1870 http_seterr(HTTP_NOT_MODIFIED); 1871 return (NULL); 1872 } 1873 1874 /* check for inconsistencies */ 1875 if (clength != -1 && length != -1 && clength != length) { 1876 http_seterr(HTTP_PROTOCOL_ERROR); 1877 goto ouch; 1878 } 1879 if (clength == -1) 1880 clength = length; 1881 if (clength != -1) 1882 length = offset + clength; 1883 if (length != -1 && size != -1 && length != size) { 1884 http_seterr(HTTP_PROTOCOL_ERROR); 1885 goto ouch; 1886 } 1887 if (size == -1) 1888 size = length; 1889 1890 /* fill in stats */ 1891 if (us) { 1892 us->size = size; 1893 us->atime = us->mtime = mtime; 1894 } 1895 1896 /* too far? */ 1897 if (URL->offset > 0 && offset > URL->offset) { 1898 http_seterr(HTTP_PROTOCOL_ERROR); 1899 goto ouch; 1900 } 1901 1902 /* report back real offset and size */ 1903 URL->offset = offset; 1904 URL->length = clength; 1905 1906 /* wrap it up in a FILE */ 1907 if ((f = http_funopen(conn, chunked)) == NULL) { 1908 fetch_syserr(); 1909 goto ouch; 1910 } 1911 1912 if (url != URL) 1913 fetchFreeURL(url); 1914 if (purl) 1915 fetchFreeURL(purl); 1916 1917 if (HTTP_ERROR(conn->err)) { 1918 http_print_html(stderr, f); 1919 fclose(f); 1920 f = NULL; 1921 } 1922 clean_http_headerbuf(&headerbuf); 1923 clean_http_auth_challenges(&server_challenges); 1924 clean_http_auth_challenges(&proxy_challenges); 1925 return (f); 1926 1927 ouch: 1928 if (url != URL) 1929 fetchFreeURL(url); 1930 if (purl) 1931 fetchFreeURL(purl); 1932 if (conn != NULL) 1933 fetch_close(conn); 1934 clean_http_headerbuf(&headerbuf); 1935 clean_http_auth_challenges(&server_challenges); 1936 clean_http_auth_challenges(&proxy_challenges); 1937 return (NULL); 1938 } 1939 1940 1941 /***************************************************************************** 1942 * Entry points 1943 */ 1944 1945 /* 1946 * Retrieve and stat a file by HTTP 1947 */ 1948 FILE * 1949 fetchXGetHTTP(struct url *URL, struct url_stat *us, const char *flags) 1950 { 1951 return (http_request(URL, "GET", us, http_get_proxy(URL, flags), flags)); 1952 } 1953 1954 /* 1955 * Retrieve a file by HTTP 1956 */ 1957 FILE * 1958 fetchGetHTTP(struct url *URL, const char *flags) 1959 { 1960 return (fetchXGetHTTP(URL, NULL, flags)); 1961 } 1962 1963 /* 1964 * Store a file by HTTP 1965 */ 1966 FILE * 1967 fetchPutHTTP(struct url *URL __unused, const char *flags __unused) 1968 { 1969 warnx("fetchPutHTTP(): not implemented"); 1970 return (NULL); 1971 } 1972 1973 /* 1974 * Get an HTTP document's metadata 1975 */ 1976 int 1977 fetchStatHTTP(struct url *URL, struct url_stat *us, const char *flags) 1978 { 1979 FILE *f; 1980 1981 f = http_request(URL, "HEAD", us, http_get_proxy(URL, flags), flags); 1982 if (f == NULL) 1983 return (-1); 1984 fclose(f); 1985 return (0); 1986 } 1987 1988 /* 1989 * List a directory 1990 */ 1991 struct url_ent * 1992 fetchListHTTP(struct url *url __unused, const char *flags __unused) 1993 { 1994 warnx("fetchListHTTP(): not implemented"); 1995 return (NULL); 1996 } 1997