1 /*- 2 * Copyright (c) 2000-2011 Dag-Erling Smørgrav 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 ssize_t nbytes; 200 201 if (io->error) 202 return (-1); 203 if (io->eof) 204 return (0); 205 206 if (io->chunked == 0) { 207 if (http_growbuf(io, len) == -1) 208 return (-1); 209 if ((nbytes = fetch_read(io->conn, io->buf, len)) == -1) { 210 io->error = errno; 211 return (-1); 212 } 213 io->buflen = nbytes; 214 io->bufpos = 0; 215 return (io->buflen); 216 } 217 218 if (io->chunksize == 0) { 219 switch (http_new_chunk(io)) { 220 case -1: 221 io->error = 1; 222 return (-1); 223 case 0: 224 io->eof = 1; 225 return (0); 226 } 227 } 228 229 if (len > io->chunksize) 230 len = io->chunksize; 231 if (http_growbuf(io, len) == -1) 232 return (-1); 233 if ((nbytes = fetch_read(io->conn, io->buf, len)) == -1) { 234 io->error = errno; 235 return (-1); 236 } 237 io->buflen = nbytes; 238 io->chunksize -= io->buflen; 239 240 if (io->chunksize == 0) { 241 char endl[2]; 242 243 if (fetch_read(io->conn, endl, 2) != 2 || 244 endl[0] != '\r' || endl[1] != '\n') 245 return (-1); 246 } 247 248 io->bufpos = 0; 249 250 return (io->buflen); 251 } 252 253 /* 254 * Read function 255 */ 256 static int 257 http_readfn(void *v, char *buf, int len) 258 { 259 struct httpio *io = (struct httpio *)v; 260 int l, pos; 261 262 if (io->error) 263 return (-1); 264 if (io->eof) 265 return (0); 266 267 for (pos = 0; len > 0; pos += l, len -= l) { 268 /* empty buffer */ 269 if (!io->buf || io->bufpos == io->buflen) 270 if (http_fillbuf(io, len) < 1) 271 break; 272 l = io->buflen - io->bufpos; 273 if (len < l) 274 l = len; 275 memcpy(buf + pos, io->buf + io->bufpos, l); 276 io->bufpos += l; 277 } 278 279 if (!pos && io->error) { 280 if (io->error == EINTR) 281 io->error = 0; 282 return (-1); 283 } 284 return (pos); 285 } 286 287 /* 288 * Write function 289 */ 290 static int 291 http_writefn(void *v, const char *buf, int len) 292 { 293 struct httpio *io = (struct httpio *)v; 294 295 return (fetch_write(io->conn, buf, len)); 296 } 297 298 /* 299 * Close function 300 */ 301 static int 302 http_closefn(void *v) 303 { 304 struct httpio *io = (struct httpio *)v; 305 int r; 306 307 r = fetch_close(io->conn); 308 if (io->buf) 309 free(io->buf); 310 free(io); 311 return (r); 312 } 313 314 /* 315 * Wrap a file descriptor up 316 */ 317 static FILE * 318 http_funopen(conn_t *conn, int chunked) 319 { 320 struct httpio *io; 321 FILE *f; 322 323 if ((io = calloc(1, sizeof(*io))) == NULL) { 324 fetch_syserr(); 325 return (NULL); 326 } 327 io->conn = conn; 328 io->chunked = chunked; 329 f = funopen(io, http_readfn, http_writefn, NULL, http_closefn); 330 if (f == NULL) { 331 fetch_syserr(); 332 free(io); 333 return (NULL); 334 } 335 return (f); 336 } 337 338 339 /***************************************************************************** 340 * Helper functions for talking to the server and parsing its replies 341 */ 342 343 /* Header types */ 344 typedef enum { 345 hdr_syserror = -2, 346 hdr_error = -1, 347 hdr_end = 0, 348 hdr_unknown = 1, 349 hdr_content_length, 350 hdr_content_range, 351 hdr_last_modified, 352 hdr_location, 353 hdr_transfer_encoding, 354 hdr_www_authenticate, 355 hdr_proxy_authenticate, 356 } hdr_t; 357 358 /* Names of interesting headers */ 359 static struct { 360 hdr_t num; 361 const char *name; 362 } hdr_names[] = { 363 { hdr_content_length, "Content-Length" }, 364 { hdr_content_range, "Content-Range" }, 365 { hdr_last_modified, "Last-Modified" }, 366 { hdr_location, "Location" }, 367 { hdr_transfer_encoding, "Transfer-Encoding" }, 368 { hdr_www_authenticate, "WWW-Authenticate" }, 369 { hdr_proxy_authenticate, "Proxy-Authenticate" }, 370 { hdr_unknown, NULL }, 371 }; 372 373 /* 374 * Send a formatted line; optionally echo to terminal 375 */ 376 static int 377 http_cmd(conn_t *conn, const char *fmt, ...) 378 { 379 va_list ap; 380 size_t len; 381 char *msg; 382 int r; 383 384 va_start(ap, fmt); 385 len = vasprintf(&msg, fmt, ap); 386 va_end(ap); 387 388 if (msg == NULL) { 389 errno = ENOMEM; 390 fetch_syserr(); 391 return (-1); 392 } 393 394 r = fetch_putln(conn, msg, len); 395 free(msg); 396 397 if (r == -1) { 398 fetch_syserr(); 399 return (-1); 400 } 401 402 return (0); 403 } 404 405 /* 406 * Get and parse status line 407 */ 408 static int 409 http_get_reply(conn_t *conn) 410 { 411 char *p; 412 413 if (fetch_getln(conn) == -1) 414 return (-1); 415 /* 416 * A valid status line looks like "HTTP/m.n xyz reason" where m 417 * and n are the major and minor protocol version numbers and xyz 418 * is the reply code. 419 * Unfortunately, there are servers out there (NCSA 1.5.1, to name 420 * just one) that do not send a version number, so we can't rely 421 * on finding one, but if we do, insist on it being 1.0 or 1.1. 422 * We don't care about the reason phrase. 423 */ 424 if (strncmp(conn->buf, "HTTP", 4) != 0) 425 return (HTTP_PROTOCOL_ERROR); 426 p = conn->buf + 4; 427 if (*p == '/') { 428 if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1')) 429 return (HTTP_PROTOCOL_ERROR); 430 p += 4; 431 } 432 if (*p != ' ' || 433 !isdigit((unsigned char)p[1]) || 434 !isdigit((unsigned char)p[2]) || 435 !isdigit((unsigned char)p[3])) 436 return (HTTP_PROTOCOL_ERROR); 437 438 conn->err = (p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0'); 439 return (conn->err); 440 } 441 442 /* 443 * Check a header; if the type matches the given string, return a pointer 444 * to the beginning of the value. 445 */ 446 static const char * 447 http_match(const char *str, const char *hdr) 448 { 449 while (*str && *hdr && 450 tolower((unsigned char)*str++) == tolower((unsigned char)*hdr++)) 451 /* nothing */; 452 if (*str || *hdr != ':') 453 return (NULL); 454 while (*hdr && isspace((unsigned char)*++hdr)) 455 /* nothing */; 456 return (hdr); 457 } 458 459 460 /* 461 * Get the next header and return the appropriate symbolic code. We 462 * need to read one line ahead for checking for a continuation line 463 * belonging to the current header (continuation lines start with 464 * white space). 465 * 466 * We get called with a fresh line already in the conn buffer, either 467 * from the previous http_next_header() invocation, or, the first 468 * time, from a fetch_getln() performed by our caller. 469 * 470 * This stops when we encounter an empty line (we dont read beyond the header 471 * area). 472 * 473 * Note that the "headerbuf" is just a place to return the result. Its 474 * contents are not used for the next call. This means that no cleanup 475 * is needed when ie doing another connection, just call the cleanup when 476 * fully done to deallocate memory. 477 */ 478 479 /* Limit the max number of continuation lines to some reasonable value */ 480 #define HTTP_MAX_CONT_LINES 10 481 482 /* Place into which to build a header from one or several lines */ 483 typedef struct { 484 char *buf; /* buffer */ 485 size_t bufsize; /* buffer size */ 486 size_t buflen; /* length of buffer contents */ 487 } http_headerbuf_t; 488 489 static void 490 init_http_headerbuf(http_headerbuf_t *buf) 491 { 492 buf->buf = NULL; 493 buf->bufsize = 0; 494 buf->buflen = 0; 495 } 496 497 static void 498 clean_http_headerbuf(http_headerbuf_t *buf) 499 { 500 if (buf->buf) 501 free(buf->buf); 502 init_http_headerbuf(buf); 503 } 504 505 /* Remove whitespace at the end of the buffer */ 506 static void 507 http_conn_trimright(conn_t *conn) 508 { 509 while (conn->buflen && 510 isspace((unsigned char)conn->buf[conn->buflen - 1])) 511 conn->buflen--; 512 conn->buf[conn->buflen] = '\0'; 513 } 514 515 static hdr_t 516 http_next_header(conn_t *conn, http_headerbuf_t *hbuf, const char **p) 517 { 518 unsigned int i, len; 519 520 /* 521 * Have to do the stripping here because of the first line. So 522 * it's done twice for the subsequent lines. No big deal 523 */ 524 http_conn_trimright(conn); 525 if (conn->buflen == 0) 526 return (hdr_end); 527 528 /* Copy the line to the headerbuf */ 529 if (hbuf->bufsize < conn->buflen + 1) { 530 if ((hbuf->buf = realloc(hbuf->buf, conn->buflen + 1)) == NULL) 531 return (hdr_syserror); 532 hbuf->bufsize = conn->buflen + 1; 533 } 534 strcpy(hbuf->buf, conn->buf); 535 hbuf->buflen = conn->buflen; 536 537 /* 538 * Fetch possible continuation lines. Stop at 1st non-continuation 539 * and leave it in the conn buffer 540 */ 541 for (i = 0; i < HTTP_MAX_CONT_LINES; i++) { 542 if (fetch_getln(conn) == -1) 543 return (hdr_syserror); 544 545 /* 546 * Note: we carry on the idea from the previous version 547 * that a pure whitespace line is equivalent to an empty 548 * one (so it's not continuation and will be handled when 549 * we are called next) 550 */ 551 http_conn_trimright(conn); 552 if (conn->buf[0] != ' ' && conn->buf[0] != "\t"[0]) 553 break; 554 555 /* Got a continuation line. Concatenate to previous */ 556 len = hbuf->buflen + conn->buflen; 557 if (hbuf->bufsize < len + 1) { 558 len *= 2; 559 if ((hbuf->buf = realloc(hbuf->buf, len + 1)) == NULL) 560 return (hdr_syserror); 561 hbuf->bufsize = len + 1; 562 } 563 strcpy(hbuf->buf + hbuf->buflen, conn->buf); 564 hbuf->buflen += conn->buflen; 565 } 566 567 /* 568 * We could check for malformed headers but we don't really care. 569 * A valid header starts with a token immediately followed by a 570 * colon; a token is any sequence of non-control, non-whitespace 571 * characters except "()<>@,;:\\\"{}". 572 */ 573 for (i = 0; hdr_names[i].num != hdr_unknown; i++) 574 if ((*p = http_match(hdr_names[i].name, hbuf->buf)) != NULL) 575 return (hdr_names[i].num); 576 577 return (hdr_unknown); 578 } 579 580 /************************** 581 * [Proxy-]Authenticate header parsing 582 */ 583 584 /* 585 * Read doublequote-delimited string into output buffer obuf (allocated 586 * by caller, whose responsibility it is to ensure that it's big enough) 587 * cp points to the first char after the initial '"' 588 * Handles \ quoting 589 * Returns pointer to the first char after the terminating double quote, or 590 * NULL for error. 591 */ 592 static const char * 593 http_parse_headerstring(const char *cp, char *obuf) 594 { 595 for (;;) { 596 switch (*cp) { 597 case 0: /* Unterminated string */ 598 *obuf = 0; 599 return (NULL); 600 case '"': /* Ending quote */ 601 *obuf = 0; 602 return (++cp); 603 case '\\': 604 if (*++cp == 0) { 605 *obuf = 0; 606 return (NULL); 607 } 608 /* FALLTHROUGH */ 609 default: 610 *obuf++ = *cp++; 611 } 612 } 613 } 614 615 /* Http auth challenge schemes */ 616 typedef enum {HTTPAS_UNKNOWN, HTTPAS_BASIC,HTTPAS_DIGEST} http_auth_schemes_t; 617 618 /* Data holder for a Basic or Digest challenge. */ 619 typedef struct { 620 http_auth_schemes_t scheme; 621 char *realm; 622 char *qop; 623 char *nonce; 624 char *opaque; 625 char *algo; 626 int stale; 627 int nc; /* Nonce count */ 628 } http_auth_challenge_t; 629 630 static void 631 init_http_auth_challenge(http_auth_challenge_t *b) 632 { 633 b->scheme = HTTPAS_UNKNOWN; 634 b->realm = b->qop = b->nonce = b->opaque = b->algo = NULL; 635 b->stale = b->nc = 0; 636 } 637 638 static void 639 clean_http_auth_challenge(http_auth_challenge_t *b) 640 { 641 if (b->realm) 642 free(b->realm); 643 if (b->qop) 644 free(b->qop); 645 if (b->nonce) 646 free(b->nonce); 647 if (b->opaque) 648 free(b->opaque); 649 if (b->algo) 650 free(b->algo); 651 init_http_auth_challenge(b); 652 } 653 654 /* Data holder for an array of challenges offered in an http response. */ 655 #define MAX_CHALLENGES 10 656 typedef struct { 657 http_auth_challenge_t *challenges[MAX_CHALLENGES]; 658 int count; /* Number of parsed challenges in the array */ 659 int valid; /* We did parse an authenticate header */ 660 } http_auth_challenges_t; 661 662 static void 663 init_http_auth_challenges(http_auth_challenges_t *cs) 664 { 665 int i; 666 for (i = 0; i < MAX_CHALLENGES; i++) 667 cs->challenges[i] = NULL; 668 cs->count = cs->valid = 0; 669 } 670 671 static void 672 clean_http_auth_challenges(http_auth_challenges_t *cs) 673 { 674 int i; 675 /* We rely on non-zero pointers being allocated, not on the count */ 676 for (i = 0; i < MAX_CHALLENGES; i++) { 677 if (cs->challenges[i] != NULL) { 678 clean_http_auth_challenge(cs->challenges[i]); 679 free(cs->challenges[i]); 680 } 681 } 682 init_http_auth_challenges(cs); 683 } 684 685 /* 686 * Enumeration for lexical elements. Separators will be returned as their own 687 * ascii value 688 */ 689 typedef enum {HTTPHL_WORD=256, HTTPHL_STRING=257, HTTPHL_END=258, 690 HTTPHL_ERROR = 259} http_header_lex_t; 691 692 /* 693 * Determine what kind of token comes next and return possible value 694 * in buf, which is supposed to have been allocated big enough by 695 * caller. Advance input pointer and return element type. 696 */ 697 static int 698 http_header_lex(const char **cpp, char *buf) 699 { 700 size_t l; 701 /* Eat initial whitespace */ 702 *cpp += strspn(*cpp, " \t"); 703 if (**cpp == 0) 704 return (HTTPHL_END); 705 706 /* Separator ? */ 707 if (**cpp == ',' || **cpp == '=') 708 return (*((*cpp)++)); 709 710 /* String ? */ 711 if (**cpp == '"') { 712 *cpp = http_parse_headerstring(++*cpp, buf); 713 if (*cpp == NULL) 714 return (HTTPHL_ERROR); 715 return (HTTPHL_STRING); 716 } 717 718 /* Read other token, until separator or whitespace */ 719 l = strcspn(*cpp, " \t,="); 720 memcpy(buf, *cpp, l); 721 buf[l] = 0; 722 *cpp += l; 723 return (HTTPHL_WORD); 724 } 725 726 /* 727 * Read challenges from http xxx-authenticate header and accumulate them 728 * in the challenges list structure. 729 * 730 * Headers with multiple challenges are specified by rfc2617, but 731 * servers (ie: squid) often send them in separate headers instead, 732 * which in turn is forbidden by the http spec (multiple headers with 733 * the same name are only allowed for pure comma-separated lists, see 734 * rfc2616 sec 4.2). 735 * 736 * We support both approaches anyway 737 */ 738 static int 739 http_parse_authenticate(const char *cp, http_auth_challenges_t *cs) 740 { 741 int ret = -1; 742 http_header_lex_t lex; 743 char *key = malloc(strlen(cp) + 1); 744 char *value = malloc(strlen(cp) + 1); 745 char *buf = malloc(strlen(cp) + 1); 746 747 if (key == NULL || value == NULL || buf == NULL) { 748 fetch_syserr(); 749 goto out; 750 } 751 752 /* In any case we've seen the header and we set the valid bit */ 753 cs->valid = 1; 754 755 /* Need word first */ 756 lex = http_header_lex(&cp, key); 757 if (lex != HTTPHL_WORD) 758 goto out; 759 760 /* Loop on challenges */ 761 for (; cs->count < MAX_CHALLENGES; cs->count++) { 762 cs->challenges[cs->count] = 763 malloc(sizeof(http_auth_challenge_t)); 764 if (cs->challenges[cs->count] == NULL) { 765 fetch_syserr(); 766 goto out; 767 } 768 init_http_auth_challenge(cs->challenges[cs->count]); 769 if (!strcasecmp(key, "basic")) { 770 cs->challenges[cs->count]->scheme = HTTPAS_BASIC; 771 } else if (!strcasecmp(key, "digest")) { 772 cs->challenges[cs->count]->scheme = HTTPAS_DIGEST; 773 } else { 774 cs->challenges[cs->count]->scheme = HTTPAS_UNKNOWN; 775 /* 776 * Continue parsing as basic or digest may 777 * follow, and the syntax is the same for 778 * all. We'll just ignore this one when 779 * looking at the list 780 */ 781 } 782 783 /* Loop on attributes */ 784 for (;;) { 785 /* Key */ 786 lex = http_header_lex(&cp, key); 787 if (lex != HTTPHL_WORD) 788 goto out; 789 790 /* Equal sign */ 791 lex = http_header_lex(&cp, buf); 792 if (lex != '=') 793 goto out; 794 795 /* Value */ 796 lex = http_header_lex(&cp, value); 797 if (lex != HTTPHL_WORD && lex != HTTPHL_STRING) 798 goto out; 799 800 if (!strcasecmp(key, "realm")) 801 cs->challenges[cs->count]->realm = 802 strdup(value); 803 else if (!strcasecmp(key, "qop")) 804 cs->challenges[cs->count]->qop = 805 strdup(value); 806 else if (!strcasecmp(key, "nonce")) 807 cs->challenges[cs->count]->nonce = 808 strdup(value); 809 else if (!strcasecmp(key, "opaque")) 810 cs->challenges[cs->count]->opaque = 811 strdup(value); 812 else if (!strcasecmp(key, "algorithm")) 813 cs->challenges[cs->count]->algo = 814 strdup(value); 815 else if (!strcasecmp(key, "stale")) 816 cs->challenges[cs->count]->stale = 817 strcasecmp(value, "no"); 818 /* Else ignore unknown attributes */ 819 820 /* Comma or Next challenge or End */ 821 lex = http_header_lex(&cp, key); 822 /* 823 * If we get a word here, this is the beginning of the 824 * next challenge. Break the attributes loop 825 */ 826 if (lex == HTTPHL_WORD) 827 break; 828 829 if (lex == HTTPHL_END) { 830 /* End while looking for ',' is normal exit */ 831 cs->count++; 832 ret = 0; 833 goto out; 834 } 835 /* Anything else is an error */ 836 if (lex != ',') 837 goto out; 838 839 } /* End attributes loop */ 840 } /* End challenge loop */ 841 842 /* 843 * Challenges max count exceeded. This really can't happen 844 * with normal data, something's fishy -> error 845 */ 846 847 out: 848 if (key) 849 free(key); 850 if (value) 851 free(value); 852 if (buf) 853 free(buf); 854 return (ret); 855 } 856 857 858 /* 859 * Parse a last-modified header 860 */ 861 static int 862 http_parse_mtime(const char *p, time_t *mtime) 863 { 864 char locale[64], *r; 865 struct tm tm; 866 867 strncpy(locale, setlocale(LC_TIME, NULL), sizeof(locale)); 868 setlocale(LC_TIME, "C"); 869 r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm); 870 /* XXX should add support for date-2 and date-3 */ 871 setlocale(LC_TIME, locale); 872 if (r == NULL) 873 return (-1); 874 DEBUG(fprintf(stderr, "last modified: [%04d-%02d-%02d " 875 "%02d:%02d:%02d]\n", 876 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 877 tm.tm_hour, tm.tm_min, tm.tm_sec)); 878 *mtime = timegm(&tm); 879 return (0); 880 } 881 882 /* 883 * Parse a content-length header 884 */ 885 static int 886 http_parse_length(const char *p, off_t *length) 887 { 888 off_t len; 889 890 for (len = 0; *p && isdigit((unsigned char)*p); ++p) 891 len = len * 10 + (*p - '0'); 892 if (*p) 893 return (-1); 894 DEBUG(fprintf(stderr, "content length: [%lld]\n", 895 (long long)len)); 896 *length = len; 897 return (0); 898 } 899 900 /* 901 * Parse a content-range header 902 */ 903 static int 904 http_parse_range(const char *p, off_t *offset, off_t *length, off_t *size) 905 { 906 off_t first, last, len; 907 908 if (strncasecmp(p, "bytes ", 6) != 0) 909 return (-1); 910 p += 6; 911 if (*p == '*') { 912 first = last = -1; 913 ++p; 914 } else { 915 for (first = 0; *p && isdigit((unsigned char)*p); ++p) 916 first = first * 10 + *p - '0'; 917 if (*p != '-') 918 return (-1); 919 for (last = 0, ++p; *p && isdigit((unsigned char)*p); ++p) 920 last = last * 10 + *p - '0'; 921 } 922 if (first > last || *p != '/') 923 return (-1); 924 for (len = 0, ++p; *p && isdigit((unsigned char)*p); ++p) 925 len = len * 10 + *p - '0'; 926 if (*p || len < last - first + 1) 927 return (-1); 928 if (first == -1) { 929 DEBUG(fprintf(stderr, "content range: [*/%lld]\n", 930 (long long)len)); 931 *length = 0; 932 } else { 933 DEBUG(fprintf(stderr, "content range: [%lld-%lld/%lld]\n", 934 (long long)first, (long long)last, (long long)len)); 935 *length = last - first + 1; 936 } 937 *offset = first; 938 *size = len; 939 return (0); 940 } 941 942 943 /***************************************************************************** 944 * Helper functions for authorization 945 */ 946 947 /* 948 * Base64 encoding 949 */ 950 static char * 951 http_base64(const char *src) 952 { 953 static const char base64[] = 954 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 955 "abcdefghijklmnopqrstuvwxyz" 956 "0123456789+/"; 957 char *str, *dst; 958 size_t l; 959 int t, r; 960 961 l = strlen(src); 962 if ((str = malloc(((l + 2) / 3) * 4 + 1)) == NULL) 963 return (NULL); 964 dst = str; 965 r = 0; 966 967 while (l >= 3) { 968 t = (src[0] << 16) | (src[1] << 8) | src[2]; 969 dst[0] = base64[(t >> 18) & 0x3f]; 970 dst[1] = base64[(t >> 12) & 0x3f]; 971 dst[2] = base64[(t >> 6) & 0x3f]; 972 dst[3] = base64[(t >> 0) & 0x3f]; 973 src += 3; l -= 3; 974 dst += 4; r += 4; 975 } 976 977 switch (l) { 978 case 2: 979 t = (src[0] << 16) | (src[1] << 8); 980 dst[0] = base64[(t >> 18) & 0x3f]; 981 dst[1] = base64[(t >> 12) & 0x3f]; 982 dst[2] = base64[(t >> 6) & 0x3f]; 983 dst[3] = '='; 984 dst += 4; 985 r += 4; 986 break; 987 case 1: 988 t = src[0] << 16; 989 dst[0] = base64[(t >> 18) & 0x3f]; 990 dst[1] = base64[(t >> 12) & 0x3f]; 991 dst[2] = dst[3] = '='; 992 dst += 4; 993 r += 4; 994 break; 995 case 0: 996 break; 997 } 998 999 *dst = 0; 1000 return (str); 1001 } 1002 1003 1004 /* 1005 * Extract authorization parameters from environment value. 1006 * The value is like scheme:realm:user:pass 1007 */ 1008 typedef struct { 1009 char *scheme; 1010 char *realm; 1011 char *user; 1012 char *password; 1013 } http_auth_params_t; 1014 1015 static void 1016 init_http_auth_params(http_auth_params_t *s) 1017 { 1018 s->scheme = s->realm = s->user = s->password = 0; 1019 } 1020 1021 static void 1022 clean_http_auth_params(http_auth_params_t *s) 1023 { 1024 if (s->scheme) 1025 free(s->scheme); 1026 if (s->realm) 1027 free(s->realm); 1028 if (s->user) 1029 free(s->user); 1030 if (s->password) 1031 free(s->password); 1032 init_http_auth_params(s); 1033 } 1034 1035 static int 1036 http_authfromenv(const char *p, http_auth_params_t *parms) 1037 { 1038 int ret = -1; 1039 char *v, *ve; 1040 char *str = strdup(p); 1041 1042 if (str == NULL) { 1043 fetch_syserr(); 1044 return (-1); 1045 } 1046 v = str; 1047 1048 if ((ve = strchr(v, ':')) == NULL) 1049 goto out; 1050 1051 *ve = 0; 1052 if ((parms->scheme = strdup(v)) == NULL) { 1053 fetch_syserr(); 1054 goto out; 1055 } 1056 v = ve + 1; 1057 1058 if ((ve = strchr(v, ':')) == NULL) 1059 goto out; 1060 1061 *ve = 0; 1062 if ((parms->realm = strdup(v)) == NULL) { 1063 fetch_syserr(); 1064 goto out; 1065 } 1066 v = ve + 1; 1067 1068 if ((ve = strchr(v, ':')) == NULL) 1069 goto out; 1070 1071 *ve = 0; 1072 if ((parms->user = strdup(v)) == NULL) { 1073 fetch_syserr(); 1074 goto out; 1075 } 1076 v = ve + 1; 1077 1078 1079 if ((parms->password = strdup(v)) == NULL) { 1080 fetch_syserr(); 1081 goto out; 1082 } 1083 ret = 0; 1084 out: 1085 if (ret == -1) 1086 clean_http_auth_params(parms); 1087 if (str) 1088 free(str); 1089 return (ret); 1090 } 1091 1092 1093 /* 1094 * Digest response: the code to compute the digest is taken from the 1095 * sample implementation in RFC2616 1096 */ 1097 #define IN const 1098 #define OUT 1099 1100 #define HASHLEN 16 1101 typedef char HASH[HASHLEN]; 1102 #define HASHHEXLEN 32 1103 typedef char HASHHEX[HASHHEXLEN+1]; 1104 1105 static const char *hexchars = "0123456789abcdef"; 1106 static void 1107 CvtHex(IN HASH Bin, OUT HASHHEX Hex) 1108 { 1109 unsigned short i; 1110 unsigned char j; 1111 1112 for (i = 0; i < HASHLEN; i++) { 1113 j = (Bin[i] >> 4) & 0xf; 1114 Hex[i*2] = hexchars[j]; 1115 j = Bin[i] & 0xf; 1116 Hex[i*2+1] = hexchars[j]; 1117 }; 1118 Hex[HASHHEXLEN] = '\0'; 1119 }; 1120 1121 /* calculate H(A1) as per spec */ 1122 static void 1123 DigestCalcHA1( 1124 IN char * pszAlg, 1125 IN char * pszUserName, 1126 IN char * pszRealm, 1127 IN char * pszPassword, 1128 IN char * pszNonce, 1129 IN char * pszCNonce, 1130 OUT HASHHEX SessionKey 1131 ) 1132 { 1133 MD5_CTX Md5Ctx; 1134 HASH HA1; 1135 1136 MD5Init(&Md5Ctx); 1137 MD5Update(&Md5Ctx, pszUserName, strlen(pszUserName)); 1138 MD5Update(&Md5Ctx, ":", 1); 1139 MD5Update(&Md5Ctx, pszRealm, strlen(pszRealm)); 1140 MD5Update(&Md5Ctx, ":", 1); 1141 MD5Update(&Md5Ctx, pszPassword, strlen(pszPassword)); 1142 MD5Final(HA1, &Md5Ctx); 1143 if (strcasecmp(pszAlg, "md5-sess") == 0) { 1144 1145 MD5Init(&Md5Ctx); 1146 MD5Update(&Md5Ctx, HA1, HASHLEN); 1147 MD5Update(&Md5Ctx, ":", 1); 1148 MD5Update(&Md5Ctx, pszNonce, strlen(pszNonce)); 1149 MD5Update(&Md5Ctx, ":", 1); 1150 MD5Update(&Md5Ctx, pszCNonce, strlen(pszCNonce)); 1151 MD5Final(HA1, &Md5Ctx); 1152 }; 1153 CvtHex(HA1, SessionKey); 1154 } 1155 1156 /* calculate request-digest/response-digest as per HTTP Digest spec */ 1157 static void 1158 DigestCalcResponse( 1159 IN HASHHEX HA1, /* H(A1) */ 1160 IN char * pszNonce, /* nonce from server */ 1161 IN char * pszNonceCount, /* 8 hex digits */ 1162 IN char * pszCNonce, /* client nonce */ 1163 IN char * pszQop, /* qop-value: "", "auth", "auth-int" */ 1164 IN char * pszMethod, /* method from the request */ 1165 IN char * pszDigestUri, /* requested URL */ 1166 IN HASHHEX HEntity, /* H(entity body) if qop="auth-int" */ 1167 OUT HASHHEX Response /* request-digest or response-digest */ 1168 ) 1169 { 1170 /* DEBUG(fprintf(stderr, 1171 "Calc: HA1[%s] Nonce[%s] qop[%s] method[%s] URI[%s]\n", 1172 HA1, pszNonce, pszQop, pszMethod, pszDigestUri));*/ 1173 MD5_CTX Md5Ctx; 1174 HASH HA2; 1175 HASH RespHash; 1176 HASHHEX HA2Hex; 1177 1178 // calculate H(A2) 1179 MD5Init(&Md5Ctx); 1180 MD5Update(&Md5Ctx, pszMethod, strlen(pszMethod)); 1181 MD5Update(&Md5Ctx, ":", 1); 1182 MD5Update(&Md5Ctx, pszDigestUri, strlen(pszDigestUri)); 1183 if (strcasecmp(pszQop, "auth-int") == 0) { 1184 MD5Update(&Md5Ctx, ":", 1); 1185 MD5Update(&Md5Ctx, HEntity, HASHHEXLEN); 1186 }; 1187 MD5Final(HA2, &Md5Ctx); 1188 CvtHex(HA2, HA2Hex); 1189 1190 // calculate response 1191 MD5Init(&Md5Ctx); 1192 MD5Update(&Md5Ctx, HA1, HASHHEXLEN); 1193 MD5Update(&Md5Ctx, ":", 1); 1194 MD5Update(&Md5Ctx, pszNonce, strlen(pszNonce)); 1195 MD5Update(&Md5Ctx, ":", 1); 1196 if (*pszQop) { 1197 MD5Update(&Md5Ctx, pszNonceCount, strlen(pszNonceCount)); 1198 MD5Update(&Md5Ctx, ":", 1); 1199 MD5Update(&Md5Ctx, pszCNonce, strlen(pszCNonce)); 1200 MD5Update(&Md5Ctx, ":", 1); 1201 MD5Update(&Md5Ctx, pszQop, strlen(pszQop)); 1202 MD5Update(&Md5Ctx, ":", 1); 1203 }; 1204 MD5Update(&Md5Ctx, HA2Hex, HASHHEXLEN); 1205 MD5Final(RespHash, &Md5Ctx); 1206 CvtHex(RespHash, Response); 1207 } 1208 1209 /* 1210 * Generate/Send a Digest authorization header 1211 * This looks like: [Proxy-]Authorization: credentials 1212 * 1213 * credentials = "Digest" digest-response 1214 * digest-response = 1#( username | realm | nonce | digest-uri 1215 * | response | [ algorithm ] | [cnonce] | 1216 * [opaque] | [message-qop] | 1217 * [nonce-count] | [auth-param] ) 1218 * username = "username" "=" username-value 1219 * username-value = quoted-string 1220 * digest-uri = "uri" "=" digest-uri-value 1221 * digest-uri-value = request-uri ; As specified by HTTP/1.1 1222 * message-qop = "qop" "=" qop-value 1223 * cnonce = "cnonce" "=" cnonce-value 1224 * cnonce-value = nonce-value 1225 * nonce-count = "nc" "=" nc-value 1226 * nc-value = 8LHEX 1227 * response = "response" "=" request-digest 1228 * request-digest = <"> 32LHEX <"> 1229 */ 1230 static int 1231 http_digest_auth(conn_t *conn, const char *hdr, http_auth_challenge_t *c, 1232 http_auth_params_t *parms, struct url *url) 1233 { 1234 int r; 1235 char noncecount[10]; 1236 char cnonce[40]; 1237 char *options = 0; 1238 1239 if (!c->realm || !c->nonce) { 1240 DEBUG(fprintf(stderr, "realm/nonce not set in challenge\n")); 1241 return(-1); 1242 } 1243 if (!c->algo) 1244 c->algo = strdup(""); 1245 1246 if (asprintf(&options, "%s%s%s%s", 1247 *c->algo? ",algorithm=" : "", c->algo, 1248 c->opaque? ",opaque=" : "", c->opaque?c->opaque:"")== -1) 1249 return (-1); 1250 1251 if (!c->qop) { 1252 c->qop = strdup(""); 1253 *noncecount = 0; 1254 *cnonce = 0; 1255 } else { 1256 c->nc++; 1257 sprintf(noncecount, "%08x", c->nc); 1258 /* We don't try very hard with the cnonce ... */ 1259 sprintf(cnonce, "%x%lx", getpid(), (unsigned long)time(0)); 1260 } 1261 1262 HASHHEX HA1; 1263 DigestCalcHA1(c->algo, parms->user, c->realm, 1264 parms->password, c->nonce, cnonce, HA1); 1265 DEBUG(fprintf(stderr, "HA1: [%s]\n", HA1)); 1266 HASHHEX digest; 1267 DigestCalcResponse(HA1, c->nonce, noncecount, cnonce, c->qop, 1268 "GET", url->doc, "", digest); 1269 1270 if (c->qop[0]) { 1271 r = http_cmd(conn, "%s: Digest username=\"%s\",realm=\"%s\"," 1272 "nonce=\"%s\",uri=\"%s\",response=\"%s\"," 1273 "qop=\"auth\", cnonce=\"%s\", nc=%s%s", 1274 hdr, parms->user, c->realm, 1275 c->nonce, url->doc, digest, 1276 cnonce, noncecount, options); 1277 } else { 1278 r = http_cmd(conn, "%s: Digest username=\"%s\",realm=\"%s\"," 1279 "nonce=\"%s\",uri=\"%s\",response=\"%s\"%s", 1280 hdr, parms->user, c->realm, 1281 c->nonce, url->doc, digest, options); 1282 } 1283 if (options) 1284 free(options); 1285 return (r); 1286 } 1287 1288 /* 1289 * Encode username and password 1290 */ 1291 static int 1292 http_basic_auth(conn_t *conn, const char *hdr, const char *usr, const char *pwd) 1293 { 1294 char *upw, *auth; 1295 int r; 1296 1297 DEBUG(fprintf(stderr, "basic: usr: [%s]\n", usr)); 1298 DEBUG(fprintf(stderr, "basic: pwd: [%s]\n", pwd)); 1299 if (asprintf(&upw, "%s:%s", usr, pwd) == -1) 1300 return (-1); 1301 auth = http_base64(upw); 1302 free(upw); 1303 if (auth == NULL) 1304 return (-1); 1305 r = http_cmd(conn, "%s: Basic %s", hdr, auth); 1306 free(auth); 1307 return (r); 1308 } 1309 1310 /* 1311 * Chose the challenge to answer and call the appropriate routine to 1312 * produce the header. 1313 */ 1314 static int 1315 http_authorize(conn_t *conn, const char *hdr, http_auth_challenges_t *cs, 1316 http_auth_params_t *parms, struct url *url) 1317 { 1318 http_auth_challenge_t *basic = NULL; 1319 http_auth_challenge_t *digest = NULL; 1320 int i; 1321 1322 /* If user or pass are null we're not happy */ 1323 if (!parms->user || !parms->password) { 1324 DEBUG(fprintf(stderr, "NULL usr or pass\n")); 1325 return (-1); 1326 } 1327 1328 /* Look for a Digest and a Basic challenge */ 1329 for (i = 0; i < cs->count; i++) { 1330 if (cs->challenges[i]->scheme == HTTPAS_BASIC) 1331 basic = cs->challenges[i]; 1332 if (cs->challenges[i]->scheme == HTTPAS_DIGEST) 1333 digest = cs->challenges[i]; 1334 } 1335 1336 /* Error if "Digest" was specified and there is no Digest challenge */ 1337 if (!digest && (parms->scheme && 1338 !strcasecmp(parms->scheme, "digest"))) { 1339 DEBUG(fprintf(stderr, 1340 "Digest auth in env, not supported by peer\n")); 1341 return (-1); 1342 } 1343 /* 1344 * If "basic" was specified in the environment, or there is no Digest 1345 * challenge, do the basic thing. Don't need a challenge for this, 1346 * so no need to check basic!=NULL 1347 */ 1348 if (!digest || (parms->scheme && !strcasecmp(parms->scheme,"basic"))) 1349 return (http_basic_auth(conn,hdr,parms->user,parms->password)); 1350 1351 /* Else, prefer digest. We just checked that it's not NULL */ 1352 return (http_digest_auth(conn, hdr, digest, parms, url)); 1353 } 1354 1355 /***************************************************************************** 1356 * Helper functions for connecting to a server or proxy 1357 */ 1358 1359 /* 1360 * Connect to the correct HTTP server or proxy. 1361 */ 1362 static conn_t * 1363 http_connect(struct url *URL, struct url *purl, const char *flags) 1364 { 1365 conn_t *conn; 1366 int verbose; 1367 int af, val; 1368 1369 #ifdef INET6 1370 af = AF_UNSPEC; 1371 #else 1372 af = AF_INET; 1373 #endif 1374 1375 verbose = CHECK_FLAG('v'); 1376 if (CHECK_FLAG('4')) 1377 af = AF_INET; 1378 #ifdef INET6 1379 else if (CHECK_FLAG('6')) 1380 af = AF_INET6; 1381 #endif 1382 1383 if (purl && strcasecmp(URL->scheme, SCHEME_HTTPS) != 0) { 1384 URL = purl; 1385 } else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) { 1386 /* can't talk http to an ftp server */ 1387 /* XXX should set an error code */ 1388 return (NULL); 1389 } 1390 1391 if ((conn = fetch_connect(URL->host, URL->port, af, verbose)) == NULL) 1392 /* fetch_connect() has already set an error code */ 1393 return (NULL); 1394 if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 && 1395 fetch_ssl(conn, verbose) == -1) { 1396 fetch_close(conn); 1397 /* grrr */ 1398 errno = EAUTH; 1399 fetch_syserr(); 1400 return (NULL); 1401 } 1402 1403 val = 1; 1404 setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, sizeof(val)); 1405 1406 return (conn); 1407 } 1408 1409 static struct url * 1410 http_get_proxy(struct url * url, const char *flags) 1411 { 1412 struct url *purl; 1413 char *p; 1414 1415 if (flags != NULL && strchr(flags, 'd') != NULL) 1416 return (NULL); 1417 if (fetch_no_proxy_match(url->host)) 1418 return (NULL); 1419 if (((p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 1420 *p && (purl = fetchParseURL(p))) { 1421 if (!*purl->scheme) 1422 strcpy(purl->scheme, SCHEME_HTTP); 1423 if (!purl->port) 1424 purl->port = fetch_default_proxy_port(purl->scheme); 1425 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 1426 return (purl); 1427 fetchFreeURL(purl); 1428 } 1429 return (NULL); 1430 } 1431 1432 static void 1433 http_print_html(FILE *out, FILE *in) 1434 { 1435 size_t len; 1436 char *line, *p, *q; 1437 int comment, tag; 1438 1439 comment = tag = 0; 1440 while ((line = fgetln(in, &len)) != NULL) { 1441 while (len && isspace((unsigned char)line[len - 1])) 1442 --len; 1443 for (p = q = line; q < line + len; ++q) { 1444 if (comment && *q == '-') { 1445 if (q + 2 < line + len && 1446 strcmp(q, "-->") == 0) { 1447 tag = comment = 0; 1448 q += 2; 1449 } 1450 } else if (tag && !comment && *q == '>') { 1451 p = q + 1; 1452 tag = 0; 1453 } else if (!tag && *q == '<') { 1454 if (q > p) 1455 fwrite(p, q - p, 1, out); 1456 tag = 1; 1457 if (q + 3 < line + len && 1458 strcmp(q, "<!--") == 0) { 1459 comment = 1; 1460 q += 3; 1461 } 1462 } 1463 } 1464 if (!tag && q > p) 1465 fwrite(p, q - p, 1, out); 1466 fputc('\n', out); 1467 } 1468 } 1469 1470 1471 /***************************************************************************** 1472 * Core 1473 */ 1474 1475 /* 1476 * Send a request and process the reply 1477 * 1478 * XXX This function is way too long, the do..while loop should be split 1479 * XXX off into a separate function. 1480 */ 1481 FILE * 1482 http_request(struct url *URL, const char *op, struct url_stat *us, 1483 struct url *purl, const char *flags) 1484 { 1485 char timebuf[80]; 1486 char hbuf[MAXHOSTNAMELEN + 7], *host; 1487 conn_t *conn; 1488 struct url *url, *new; 1489 int chunked, direct, ims, noredirect, verbose; 1490 int e, i, n, val; 1491 off_t offset, clength, length, size; 1492 time_t mtime; 1493 const char *p; 1494 FILE *f; 1495 hdr_t h; 1496 struct tm *timestruct; 1497 http_headerbuf_t headerbuf; 1498 http_auth_challenges_t server_challenges; 1499 http_auth_challenges_t proxy_challenges; 1500 1501 /* The following calls don't allocate anything */ 1502 init_http_headerbuf(&headerbuf); 1503 init_http_auth_challenges(&server_challenges); 1504 init_http_auth_challenges(&proxy_challenges); 1505 1506 direct = CHECK_FLAG('d'); 1507 noredirect = CHECK_FLAG('A'); 1508 verbose = CHECK_FLAG('v'); 1509 ims = CHECK_FLAG('i'); 1510 1511 if (direct && purl) { 1512 fetchFreeURL(purl); 1513 purl = NULL; 1514 } 1515 1516 /* try the provided URL first */ 1517 url = URL; 1518 1519 /* if the A flag is set, we only get one try */ 1520 n = noredirect ? 1 : MAX_REDIRECT; 1521 i = 0; 1522 1523 e = HTTP_PROTOCOL_ERROR; 1524 do { 1525 new = NULL; 1526 chunked = 0; 1527 offset = 0; 1528 clength = -1; 1529 length = -1; 1530 size = -1; 1531 mtime = 0; 1532 1533 /* check port */ 1534 if (!url->port) 1535 url->port = fetch_default_port(url->scheme); 1536 1537 /* were we redirected to an FTP URL? */ 1538 if (purl == NULL && strcmp(url->scheme, SCHEME_FTP) == 0) { 1539 if (strcmp(op, "GET") == 0) 1540 return (ftp_request(url, "RETR", us, purl, flags)); 1541 else if (strcmp(op, "HEAD") == 0) 1542 return (ftp_request(url, "STAT", us, purl, flags)); 1543 } 1544 1545 /* connect to server or proxy */ 1546 if ((conn = http_connect(url, purl, flags)) == NULL) 1547 goto ouch; 1548 1549 host = url->host; 1550 #ifdef INET6 1551 if (strchr(url->host, ':')) { 1552 snprintf(hbuf, sizeof(hbuf), "[%s]", url->host); 1553 host = hbuf; 1554 } 1555 #endif 1556 if (url->port != fetch_default_port(url->scheme)) { 1557 if (host != hbuf) { 1558 strcpy(hbuf, host); 1559 host = hbuf; 1560 } 1561 snprintf(hbuf + strlen(hbuf), 1562 sizeof(hbuf) - strlen(hbuf), ":%d", url->port); 1563 } 1564 1565 /* send request */ 1566 if (verbose) 1567 fetch_info("requesting %s://%s%s", 1568 url->scheme, host, url->doc); 1569 if (purl) { 1570 http_cmd(conn, "%s %s://%s%s HTTP/1.1", 1571 op, url->scheme, host, url->doc); 1572 } else { 1573 http_cmd(conn, "%s %s HTTP/1.1", 1574 op, url->doc); 1575 } 1576 1577 if (ims && url->ims_time) { 1578 timestruct = gmtime((time_t *)&url->ims_time); 1579 (void)strftime(timebuf, 80, "%a, %d %b %Y %T GMT", 1580 timestruct); 1581 if (verbose) 1582 fetch_info("If-Modified-Since: %s", timebuf); 1583 http_cmd(conn, "If-Modified-Since: %s", timebuf); 1584 } 1585 /* virtual host */ 1586 http_cmd(conn, "Host: %s", host); 1587 1588 /* 1589 * Proxy authorization: we only send auth after we received 1590 * a 407 error. We do not first try basic anyway (changed 1591 * when support was added for digest-auth) 1592 */ 1593 if (purl && proxy_challenges.valid) { 1594 http_auth_params_t aparams; 1595 init_http_auth_params(&aparams); 1596 if (*purl->user || *purl->pwd) { 1597 aparams.user = purl->user ? 1598 strdup(purl->user) : strdup(""); 1599 aparams.password = purl->pwd? 1600 strdup(purl->pwd) : strdup(""); 1601 } else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL && 1602 *p != '\0') { 1603 if (http_authfromenv(p, &aparams) < 0) { 1604 http_seterr(HTTP_NEED_PROXY_AUTH); 1605 goto ouch; 1606 } 1607 } 1608 http_authorize(conn, "Proxy-Authorization", 1609 &proxy_challenges, &aparams, url); 1610 clean_http_auth_params(&aparams); 1611 } 1612 1613 /* 1614 * Server authorization: we never send "a priori" 1615 * Basic auth, which used to be done if user/pass were 1616 * set in the url. This would be weird because we'd send the 1617 * password in the clear even if Digest is finally to be 1618 * used (it would have made more sense for the 1619 * pre-digest version to do this when Basic was specified 1620 * in the environment) 1621 */ 1622 if (server_challenges.valid) { 1623 http_auth_params_t aparams; 1624 init_http_auth_params(&aparams); 1625 if (*url->user || *url->pwd) { 1626 aparams.user = url->user ? 1627 strdup(url->user) : strdup(""); 1628 aparams.password = url->pwd ? 1629 strdup(url->pwd) : strdup(""); 1630 } else if ((p = getenv("HTTP_AUTH")) != NULL && 1631 *p != '\0') { 1632 if (http_authfromenv(p, &aparams) < 0) { 1633 http_seterr(HTTP_NEED_AUTH); 1634 goto ouch; 1635 } 1636 } else if (fetchAuthMethod && 1637 fetchAuthMethod(url) == 0) { 1638 aparams.user = url->user ? 1639 strdup(url->user) : strdup(""); 1640 aparams.password = url->pwd ? 1641 strdup(url->pwd) : strdup(""); 1642 } else { 1643 http_seterr(HTTP_NEED_AUTH); 1644 goto ouch; 1645 } 1646 http_authorize(conn, "Authorization", 1647 &server_challenges, &aparams, url); 1648 clean_http_auth_params(&aparams); 1649 } 1650 1651 /* other headers */ 1652 if ((p = getenv("HTTP_REFERER")) != NULL && *p != '\0') { 1653 if (strcasecmp(p, "auto") == 0) 1654 http_cmd(conn, "Referer: %s://%s%s", 1655 url->scheme, host, url->doc); 1656 else 1657 http_cmd(conn, "Referer: %s", p); 1658 } 1659 if ((p = getenv("HTTP_USER_AGENT")) != NULL && *p != '\0') 1660 http_cmd(conn, "User-Agent: %s", p); 1661 else 1662 http_cmd(conn, "User-Agent: %s " _LIBFETCH_VER, getprogname()); 1663 if (url->offset > 0) 1664 http_cmd(conn, "Range: bytes=%lld-", (long long)url->offset); 1665 http_cmd(conn, "Connection: close"); 1666 http_cmd(conn, ""); 1667 1668 /* 1669 * Force the queued request to be dispatched. Normally, one 1670 * would do this with shutdown(2) but squid proxies can be 1671 * configured to disallow such half-closed connections. To 1672 * be compatible with such configurations, fiddle with socket 1673 * options to force the pending data to be written. 1674 */ 1675 val = 0; 1676 setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, 1677 sizeof(val)); 1678 val = 1; 1679 setsockopt(conn->sd, IPPROTO_TCP, TCP_NODELAY, &val, 1680 sizeof(val)); 1681 1682 /* get reply */ 1683 switch (http_get_reply(conn)) { 1684 case HTTP_OK: 1685 case HTTP_PARTIAL: 1686 case HTTP_NOT_MODIFIED: 1687 /* fine */ 1688 break; 1689 case HTTP_MOVED_PERM: 1690 case HTTP_MOVED_TEMP: 1691 case HTTP_SEE_OTHER: 1692 /* 1693 * Not so fine, but we still have to read the 1694 * headers to get the new location. 1695 */ 1696 break; 1697 case HTTP_NEED_AUTH: 1698 if (server_challenges.valid) { 1699 /* 1700 * We already sent out authorization code, 1701 * so there's nothing more we can do. 1702 */ 1703 http_seterr(conn->err); 1704 goto ouch; 1705 } 1706 /* try again, but send the password this time */ 1707 if (verbose) 1708 fetch_info("server requires authorization"); 1709 break; 1710 case HTTP_NEED_PROXY_AUTH: 1711 if (proxy_challenges.valid) { 1712 /* 1713 * We already sent our proxy 1714 * authorization code, so there's 1715 * nothing more we can do. */ 1716 http_seterr(conn->err); 1717 goto ouch; 1718 } 1719 /* try again, but send the password this time */ 1720 if (verbose) 1721 fetch_info("proxy requires authorization"); 1722 break; 1723 case HTTP_BAD_RANGE: 1724 /* 1725 * This can happen if we ask for 0 bytes because 1726 * we already have the whole file. Consider this 1727 * a success for now, and check sizes later. 1728 */ 1729 break; 1730 case HTTP_PROTOCOL_ERROR: 1731 /* fall through */ 1732 case -1: 1733 fetch_syserr(); 1734 goto ouch; 1735 default: 1736 http_seterr(conn->err); 1737 if (!verbose) 1738 goto ouch; 1739 /* fall through so we can get the full error message */ 1740 } 1741 1742 /* get headers. http_next_header expects one line readahead */ 1743 if (fetch_getln(conn) == -1) { 1744 fetch_syserr(); 1745 goto ouch; 1746 } 1747 do { 1748 switch ((h = http_next_header(conn, &headerbuf, &p))) { 1749 case hdr_syserror: 1750 fetch_syserr(); 1751 goto ouch; 1752 case hdr_error: 1753 http_seterr(HTTP_PROTOCOL_ERROR); 1754 goto ouch; 1755 case hdr_content_length: 1756 http_parse_length(p, &clength); 1757 break; 1758 case hdr_content_range: 1759 http_parse_range(p, &offset, &length, &size); 1760 break; 1761 case hdr_last_modified: 1762 http_parse_mtime(p, &mtime); 1763 break; 1764 case hdr_location: 1765 if (!HTTP_REDIRECT(conn->err)) 1766 break; 1767 if (new) 1768 free(new); 1769 if (verbose) 1770 fetch_info("%d redirect to %s", conn->err, p); 1771 if (*p == '/') 1772 /* absolute path */ 1773 new = fetchMakeURL(url->scheme, url->host, url->port, p, 1774 url->user, url->pwd); 1775 else 1776 new = fetchParseURL(p); 1777 if (new == NULL) { 1778 /* XXX should set an error code */ 1779 DEBUG(fprintf(stderr, "failed to parse new URL\n")); 1780 goto ouch; 1781 } 1782 1783 /* Only copy credentials if the host matches */ 1784 if (!strcmp(new->host, url->host) && !*new->user && !*new->pwd) { 1785 strcpy(new->user, url->user); 1786 strcpy(new->pwd, url->pwd); 1787 } 1788 new->offset = url->offset; 1789 new->length = url->length; 1790 break; 1791 case hdr_transfer_encoding: 1792 /* XXX weak test*/ 1793 chunked = (strcasecmp(p, "chunked") == 0); 1794 break; 1795 case hdr_www_authenticate: 1796 if (conn->err != HTTP_NEED_AUTH) 1797 break; 1798 if (http_parse_authenticate(p, &server_challenges) == 0) 1799 ++n; 1800 break; 1801 case hdr_proxy_authenticate: 1802 if (conn->err != HTTP_NEED_PROXY_AUTH) 1803 break; 1804 if (http_parse_authenticate(p, &proxy_challenges) == 0) 1805 ++n; 1806 break; 1807 case hdr_end: 1808 /* fall through */ 1809 case hdr_unknown: 1810 /* ignore */ 1811 break; 1812 } 1813 } while (h > hdr_end); 1814 1815 /* we need to provide authentication */ 1816 if (conn->err == HTTP_NEED_AUTH || 1817 conn->err == HTTP_NEED_PROXY_AUTH) { 1818 e = conn->err; 1819 if ((conn->err == HTTP_NEED_AUTH && 1820 !server_challenges.valid) || 1821 (conn->err == HTTP_NEED_PROXY_AUTH && 1822 !proxy_challenges.valid)) { 1823 /* 401/7 but no www/proxy-authenticate ?? */ 1824 DEBUG(fprintf(stderr, "401/7 and no auth header\n")); 1825 goto ouch; 1826 } 1827 fetch_close(conn); 1828 conn = NULL; 1829 continue; 1830 } 1831 1832 /* requested range not satisfiable */ 1833 if (conn->err == HTTP_BAD_RANGE) { 1834 if (url->offset == size && url->length == 0) { 1835 /* asked for 0 bytes; fake it */ 1836 offset = url->offset; 1837 clength = -1; 1838 conn->err = HTTP_OK; 1839 break; 1840 } else { 1841 http_seterr(conn->err); 1842 goto ouch; 1843 } 1844 } 1845 1846 /* we have a hit or an error */ 1847 if (conn->err == HTTP_OK 1848 || conn->err == HTTP_NOT_MODIFIED 1849 || conn->err == HTTP_PARTIAL 1850 || HTTP_ERROR(conn->err)) 1851 break; 1852 1853 /* all other cases: we got a redirect */ 1854 e = conn->err; 1855 clean_http_auth_challenges(&server_challenges); 1856 fetch_close(conn); 1857 conn = NULL; 1858 if (!new) { 1859 DEBUG(fprintf(stderr, "redirect with no new location\n")); 1860 break; 1861 } 1862 if (url != URL) 1863 fetchFreeURL(url); 1864 url = new; 1865 } while (++i < n); 1866 1867 /* we failed, or ran out of retries */ 1868 if (conn == NULL) { 1869 http_seterr(e); 1870 goto ouch; 1871 } 1872 1873 DEBUG(fprintf(stderr, "offset %lld, length %lld," 1874 " size %lld, clength %lld\n", 1875 (long long)offset, (long long)length, 1876 (long long)size, (long long)clength)); 1877 1878 if (conn->err == HTTP_NOT_MODIFIED) { 1879 http_seterr(HTTP_NOT_MODIFIED); 1880 return (NULL); 1881 } 1882 1883 /* check for inconsistencies */ 1884 if (clength != -1 && length != -1 && clength != length) { 1885 http_seterr(HTTP_PROTOCOL_ERROR); 1886 goto ouch; 1887 } 1888 if (clength == -1) 1889 clength = length; 1890 if (clength != -1) 1891 length = offset + clength; 1892 if (length != -1 && size != -1 && length != size) { 1893 http_seterr(HTTP_PROTOCOL_ERROR); 1894 goto ouch; 1895 } 1896 if (size == -1) 1897 size = length; 1898 1899 /* fill in stats */ 1900 if (us) { 1901 us->size = size; 1902 us->atime = us->mtime = mtime; 1903 } 1904 1905 /* too far? */ 1906 if (URL->offset > 0 && offset > URL->offset) { 1907 http_seterr(HTTP_PROTOCOL_ERROR); 1908 goto ouch; 1909 } 1910 1911 /* report back real offset and size */ 1912 URL->offset = offset; 1913 URL->length = clength; 1914 1915 /* wrap it up in a FILE */ 1916 if ((f = http_funopen(conn, chunked)) == NULL) { 1917 fetch_syserr(); 1918 goto ouch; 1919 } 1920 1921 if (url != URL) 1922 fetchFreeURL(url); 1923 if (purl) 1924 fetchFreeURL(purl); 1925 1926 if (HTTP_ERROR(conn->err)) { 1927 http_print_html(stderr, f); 1928 fclose(f); 1929 f = NULL; 1930 } 1931 clean_http_headerbuf(&headerbuf); 1932 clean_http_auth_challenges(&server_challenges); 1933 clean_http_auth_challenges(&proxy_challenges); 1934 return (f); 1935 1936 ouch: 1937 if (url != URL) 1938 fetchFreeURL(url); 1939 if (purl) 1940 fetchFreeURL(purl); 1941 if (conn != NULL) 1942 fetch_close(conn); 1943 clean_http_headerbuf(&headerbuf); 1944 clean_http_auth_challenges(&server_challenges); 1945 clean_http_auth_challenges(&proxy_challenges); 1946 return (NULL); 1947 } 1948 1949 1950 /***************************************************************************** 1951 * Entry points 1952 */ 1953 1954 /* 1955 * Retrieve and stat a file by HTTP 1956 */ 1957 FILE * 1958 fetchXGetHTTP(struct url *URL, struct url_stat *us, const char *flags) 1959 { 1960 return (http_request(URL, "GET", us, http_get_proxy(URL, flags), flags)); 1961 } 1962 1963 /* 1964 * Retrieve a file by HTTP 1965 */ 1966 FILE * 1967 fetchGetHTTP(struct url *URL, const char *flags) 1968 { 1969 return (fetchXGetHTTP(URL, NULL, flags)); 1970 } 1971 1972 /* 1973 * Store a file by HTTP 1974 */ 1975 FILE * 1976 fetchPutHTTP(struct url *URL __unused, const char *flags __unused) 1977 { 1978 warnx("fetchPutHTTP(): not implemented"); 1979 return (NULL); 1980 } 1981 1982 /* 1983 * Get an HTTP document's metadata 1984 */ 1985 int 1986 fetchStatHTTP(struct url *URL, struct url_stat *us, const char *flags) 1987 { 1988 FILE *f; 1989 1990 f = http_request(URL, "HEAD", us, http_get_proxy(URL, flags), flags); 1991 if (f == NULL) 1992 return (-1); 1993 fclose(f); 1994 return (0); 1995 } 1996 1997 /* 1998 * List a directory 1999 */ 2000 struct url_ent * 2001 fetchListHTTP(struct url *url __unused, const char *flags __unused) 2002 { 2003 warnx("fetchListHTTP(): not implemented"); 2004 return (NULL); 2005 } 2006