http.c revision 97859
1/*- 2 * Copyright (c) 2000 Dag-Erling Co�dan Sm�rgrav 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: head/lib/libfetch/http.c 97859 2002-06-05 10:31:01Z des $"); 31 32/* 33 * The following copyright applies to the base64 code: 34 * 35 *- 36 * Copyright 1997 Massachusetts Institute of Technology 37 * 38 * Permission to use, copy, modify, and distribute this software and 39 * its documentation for any purpose and without fee is hereby 40 * granted, provided that both the above copyright notice and this 41 * permission notice appear in all copies, that both the above 42 * copyright notice and this permission notice appear in all 43 * supporting documentation, and that the name of M.I.T. not be used 44 * in advertising or publicity pertaining to distribution of the 45 * software without specific, written prior permission. M.I.T. makes 46 * no representations about the suitability of this software for any 47 * purpose. It is provided "as is" without express or implied 48 * warranty. 49 * 50 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 51 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 52 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 53 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 54 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 55 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 56 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 57 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 58 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 59 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 60 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 61 * SUCH DAMAGE. 62 */ 63 64#include <sys/param.h> 65#include <sys/socket.h> 66 67#include <ctype.h> 68#include <err.h> 69#include <errno.h> 70#include <locale.h> 71#include <netdb.h> 72#include <stdarg.h> 73#include <stdio.h> 74#include <stdlib.h> 75#include <string.h> 76#include <time.h> 77#include <unistd.h> 78 79#include "fetch.h" 80#include "common.h" 81#include "httperr.h" 82 83/* Maximum number of redirects to follow */ 84#define MAX_REDIRECT 5 85 86/* Symbolic names for reply codes we care about */ 87#define HTTP_OK 200 88#define HTTP_PARTIAL 206 89#define HTTP_MOVED_PERM 301 90#define HTTP_MOVED_TEMP 302 91#define HTTP_SEE_OTHER 303 92#define HTTP_NEED_AUTH 401 93#define HTTP_NEED_PROXY_AUTH 407 94#define HTTP_PROTOCOL_ERROR 999 95 96#define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \ 97 || (xyz) == HTTP_MOVED_TEMP \ 98 || (xyz) == HTTP_SEE_OTHER) 99 100#define HTTP_ERROR(xyz) ((xyz) > 400 && (xyz) < 599) 101 102 103/***************************************************************************** 104 * I/O functions for decoding chunked streams 105 */ 106 107struct httpio 108{ 109 conn_t *conn; /* connection */ 110 char *buf; /* chunk buffer */ 111 size_t b_size; /* size of chunk buffer */ 112 ssize_t b_len; /* amount of data currently in buffer */ 113 int b_pos; /* current read offset in buffer */ 114 int eof; /* end-of-file flag */ 115 int error; /* error flag */ 116 size_t chunksize; /* remaining size of current chunk */ 117#ifndef NDEBUG 118 size_t total; 119#endif 120}; 121 122/* 123 * Get next chunk header 124 */ 125static int 126_http_new_chunk(struct httpio *io) 127{ 128 char *p; 129 130 if (_fetch_getln(io->conn) == -1) 131 return (-1); 132 133 if (io->conn->buflen < 2 || !ishexnumber(*io->conn->buf)) 134 return (-1); 135 136 for (p = io->conn->buf; *p && !isspace(*p); ++p) { 137 if (*p == ';') 138 break; 139 if (!ishexnumber(*p)) 140 return (-1); 141 if (isdigit(*p)) { 142 io->chunksize = io->chunksize * 16 + 143 *p - '0'; 144 } else { 145 io->chunksize = io->chunksize * 16 + 146 10 + tolower(*p) - 'a'; 147 } 148 } 149 150#ifndef NDEBUG 151 if (fetchDebug) { 152 io->total += io->chunksize; 153 if (io->chunksize == 0) 154 fprintf(stderr, "_http_fillbuf(): " 155 "end of last chunk\n"); 156 else 157 fprintf(stderr, "_http_fillbuf(): " 158 "new chunk: %lu (%lu)\n", 159 (unsigned long)io->chunksize, (unsigned long)io->total); 160 } 161#endif 162 163 return (io->chunksize); 164} 165 166/* 167 * Fill the input buffer, do chunk decoding on the fly 168 */ 169static int 170_http_fillbuf(struct httpio *io) 171{ 172 if (io->error) 173 return (-1); 174 if (io->eof) 175 return (0); 176 177 if (io->chunksize == 0) { 178 switch (_http_new_chunk(io)) { 179 case -1: 180 io->error = 1; 181 return (-1); 182 case 0: 183 io->eof = 1; 184 return (0); 185 } 186 } 187 188 if (io->b_size < io->chunksize) { 189 char *tmp; 190 191 if ((tmp = realloc(io->buf, io->chunksize)) == NULL) 192 return (-1); 193 io->buf = tmp; 194 io->b_size = io->chunksize; 195 } 196 197 if ((io->b_len = read(io->conn->sd, io->buf, io->chunksize)) == -1) 198 return (-1); 199 io->chunksize -= io->b_len; 200 201 if (io->chunksize == 0) { 202 char endl[2]; 203 204 if (read(io->conn->sd, &endl[0], 1) == -1 || 205 read(io->conn->sd, &endl[1], 1) == -1 || 206 endl[0] != '\r' || endl[1] != '\n') 207 return (-1); 208 } 209 210 io->b_pos = 0; 211 212 return (io->b_len); 213} 214 215/* 216 * Read function 217 */ 218static int 219_http_readfn(void *v, char *buf, int len) 220{ 221 struct httpio *io = (struct httpio *)v; 222 int l, pos; 223 224 if (io->error) 225 return (-1); 226 if (io->eof) 227 return (0); 228 229 for (pos = 0; len > 0; pos += l, len -= l) { 230 /* empty buffer */ 231 if (!io->buf || io->b_pos == io->b_len) 232 if (_http_fillbuf(io) < 1) 233 break; 234 l = io->b_len - io->b_pos; 235 if (len < l) 236 l = len; 237 bcopy(io->buf + io->b_pos, buf + pos, l); 238 io->b_pos += l; 239 } 240 241 if (!pos && io->error) 242 return (-1); 243 return (pos); 244} 245 246/* 247 * Write function 248 */ 249static int 250_http_writefn(void *v, const char *buf, int len) 251{ 252 struct httpio *io = (struct httpio *)v; 253 254 return (write(io->conn->sd, buf, len)); 255} 256 257/* 258 * Close function 259 */ 260static int 261_http_closefn(void *v) 262{ 263 struct httpio *io = (struct httpio *)v; 264 int r; 265 266 r = _fetch_close(io->conn); 267 if (io->buf) 268 free(io->buf); 269 free(io); 270 return (r); 271} 272 273/* 274 * Wrap a file descriptor up 275 */ 276static FILE * 277_http_funopen(conn_t *conn) 278{ 279 struct httpio *io; 280 FILE *f; 281 282 if ((io = calloc(1, sizeof *io)) == NULL) { 283 _fetch_syserr(); 284 return (NULL); 285 } 286 io->conn = conn; 287 f = funopen(io, _http_readfn, _http_writefn, NULL, _http_closefn); 288 if (f == NULL) { 289 _fetch_syserr(); 290 free(io); 291 return (NULL); 292 } 293 return (f); 294} 295 296 297/***************************************************************************** 298 * Helper functions for talking to the server and parsing its replies 299 */ 300 301/* Header types */ 302typedef enum { 303 hdr_syserror = -2, 304 hdr_error = -1, 305 hdr_end = 0, 306 hdr_unknown = 1, 307 hdr_content_length, 308 hdr_content_range, 309 hdr_last_modified, 310 hdr_location, 311 hdr_transfer_encoding, 312 hdr_www_authenticate 313} hdr_t; 314 315/* Names of interesting headers */ 316static struct { 317 hdr_t num; 318 const char *name; 319} hdr_names[] = { 320 { hdr_content_length, "Content-Length" }, 321 { hdr_content_range, "Content-Range" }, 322 { hdr_last_modified, "Last-Modified" }, 323 { hdr_location, "Location" }, 324 { hdr_transfer_encoding, "Transfer-Encoding" }, 325 { hdr_www_authenticate, "WWW-Authenticate" }, 326 { hdr_unknown, NULL }, 327}; 328 329/* 330 * Send a formatted line; optionally echo to terminal 331 */ 332static int 333_http_cmd(conn_t *conn, const char *fmt, ...) 334{ 335 va_list ap; 336 size_t len; 337 char *msg; 338 int r; 339 340 va_start(ap, fmt); 341 len = vasprintf(&msg, fmt, ap); 342 va_end(ap); 343 344 if (msg == NULL) { 345 errno = ENOMEM; 346 _fetch_syserr(); 347 return (-1); 348 } 349 350 r = _fetch_putln(conn, msg, len); 351 free(msg); 352 353 if (r == -1) { 354 _fetch_syserr(); 355 return (-1); 356 } 357 358 return (0); 359} 360 361/* 362 * Get and parse status line 363 */ 364static int 365_http_get_reply(conn_t *conn) 366{ 367 char *p; 368 369 if (_fetch_getln(conn) == -1) 370 return (-1); 371 /* 372 * A valid status line looks like "HTTP/m.n xyz reason" where m 373 * and n are the major and minor protocol version numbers and xyz 374 * is the reply code. 375 * Unfortunately, there are servers out there (NCSA 1.5.1, to name 376 * just one) that do not send a version number, so we can't rely 377 * on finding one, but if we do, insist on it being 1.0 or 1.1. 378 * We don't care about the reason phrase. 379 */ 380 if (strncmp(conn->buf, "HTTP", 4) != 0) 381 return (HTTP_PROTOCOL_ERROR); 382 p = conn->buf + 4; 383 if (*p == '/') { 384 if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1')) 385 return (HTTP_PROTOCOL_ERROR); 386 p += 4; 387 } 388 if (*p != ' ' || !isdigit(p[1]) || !isdigit(p[2]) || !isdigit(p[3])) 389 return (HTTP_PROTOCOL_ERROR); 390 391 conn->err = (p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0'); 392 return (conn->err); 393} 394 395/* 396 * Check a header; if the type matches the given string, return a pointer 397 * to the beginning of the value. 398 */ 399static const char * 400_http_match(const char *str, const char *hdr) 401{ 402 while (*str && *hdr && tolower(*str++) == tolower(*hdr++)) 403 /* nothing */; 404 if (*str || *hdr != ':') 405 return (NULL); 406 while (*hdr && isspace(*++hdr)) 407 /* nothing */; 408 return (hdr); 409} 410 411/* 412 * Get the next header and return the appropriate symbolic code. 413 */ 414static hdr_t 415_http_next_header(conn_t *conn, const char **p) 416{ 417 int i; 418 419 if (_fetch_getln(conn) == -1) 420 return (hdr_syserror); 421 while (conn->buflen && isspace(conn->buf[conn->buflen - 1])) 422 conn->buflen--; 423 conn->buf[conn->buflen] = '\0'; 424 if (conn->buflen == 0) 425 return (hdr_end); 426 /* 427 * We could check for malformed headers but we don't really care. 428 * A valid header starts with a token immediately followed by a 429 * colon; a token is any sequence of non-control, non-whitespace 430 * characters except "()<>@,;:\\\"{}". 431 */ 432 for (i = 0; hdr_names[i].num != hdr_unknown; i++) 433 if ((*p = _http_match(hdr_names[i].name, conn->buf)) != NULL) 434 return (hdr_names[i].num); 435 return (hdr_unknown); 436} 437 438/* 439 * Parse a last-modified header 440 */ 441static int 442_http_parse_mtime(const char *p, time_t *mtime) 443{ 444 char locale[64], *r; 445 struct tm tm; 446 447 strncpy(locale, setlocale(LC_TIME, NULL), sizeof locale); 448 setlocale(LC_TIME, "C"); 449 r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm); 450 /* XXX should add support for date-2 and date-3 */ 451 setlocale(LC_TIME, locale); 452 if (r == NULL) 453 return (-1); 454 DEBUG(fprintf(stderr, "last modified: [%04d-%02d-%02d " 455 "%02d:%02d:%02d]\n", 456 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 457 tm.tm_hour, tm.tm_min, tm.tm_sec)); 458 *mtime = timegm(&tm); 459 return (0); 460} 461 462/* 463 * Parse a content-length header 464 */ 465static int 466_http_parse_length(const char *p, off_t *length) 467{ 468 off_t len; 469 470 for (len = 0; *p && isdigit(*p); ++p) 471 len = len * 10 + (*p - '0'); 472 if (*p) 473 return (-1); 474 DEBUG(fprintf(stderr, "content length: [%lld]\n", 475 (long long)len)); 476 *length = len; 477 return (0); 478} 479 480/* 481 * Parse a content-range header 482 */ 483static int 484_http_parse_range(const char *p, off_t *offset, off_t *length, off_t *size) 485{ 486 off_t first, last, len; 487 488 if (strncasecmp(p, "bytes ", 6) != 0) 489 return (-1); 490 for (first = 0, p += 6; *p && isdigit(*p); ++p) 491 first = first * 10 + *p - '0'; 492 if (*p != '-') 493 return (-1); 494 for (last = 0, ++p; *p && isdigit(*p); ++p) 495 last = last * 10 + *p - '0'; 496 if (first > last || *p != '/') 497 return (-1); 498 for (len = 0, ++p; *p && isdigit(*p); ++p) 499 len = len * 10 + *p - '0'; 500 if (*p || len < last - first + 1) 501 return (-1); 502 DEBUG(fprintf(stderr, "content range: [%lld-%lld/%lld]\n", 503 (long long)first, (long long)last, (long long)len)); 504 *offset = first; 505 *length = last - first + 1; 506 *size = len; 507 return (0); 508} 509 510 511/***************************************************************************** 512 * Helper functions for authorization 513 */ 514 515/* 516 * Base64 encoding 517 */ 518static char * 519_http_base64(const char *src) 520{ 521 static const char base64[] = 522 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 523 "abcdefghijklmnopqrstuvwxyz" 524 "0123456789+/"; 525 char *str, *dst; 526 size_t l; 527 int t, r; 528 529 l = strlen(src); 530 if ((str = malloc(((l + 2) / 3) * 4)) == NULL) 531 return (NULL); 532 dst = str; 533 r = 0; 534 535 while (l >= 3) { 536 t = (src[0] << 16) | (src[1] << 8) | src[2]; 537 dst[0] = base64[(t >> 18) & 0x3f]; 538 dst[1] = base64[(t >> 12) & 0x3f]; 539 dst[2] = base64[(t >> 6) & 0x3f]; 540 dst[3] = base64[(t >> 0) & 0x3f]; 541 src += 3; l -= 3; 542 dst += 4; r += 4; 543 } 544 545 switch (l) { 546 case 2: 547 t = (src[0] << 16) | (src[1] << 8); 548 dst[0] = base64[(t >> 18) & 0x3f]; 549 dst[1] = base64[(t >> 12) & 0x3f]; 550 dst[2] = base64[(t >> 6) & 0x3f]; 551 dst[3] = '='; 552 dst += 4; 553 r += 4; 554 break; 555 case 1: 556 t = src[0] << 16; 557 dst[0] = base64[(t >> 18) & 0x3f]; 558 dst[1] = base64[(t >> 12) & 0x3f]; 559 dst[2] = dst[3] = '='; 560 dst += 4; 561 r += 4; 562 break; 563 case 0: 564 break; 565 } 566 567 *dst = 0; 568 return (str); 569} 570 571/* 572 * Encode username and password 573 */ 574static int 575_http_basic_auth(conn_t *conn, const char *hdr, const char *usr, const char *pwd) 576{ 577 char *upw, *auth; 578 int r; 579 580 DEBUG(fprintf(stderr, "usr: [%s]\n", usr)); 581 DEBUG(fprintf(stderr, "pwd: [%s]\n", pwd)); 582 if (asprintf(&upw, "%s:%s", usr, pwd) == -1) 583 return (-1); 584 auth = _http_base64(upw); 585 free(upw); 586 if (auth == NULL) 587 return (-1); 588 r = _http_cmd(conn, "%s: Basic %s", hdr, auth); 589 free(auth); 590 return (r); 591} 592 593/* 594 * Send an authorization header 595 */ 596static int 597_http_authorize(conn_t *conn, const char *hdr, const char *p) 598{ 599 /* basic authorization */ 600 if (strncasecmp(p, "basic:", 6) == 0) { 601 char *user, *pwd, *str; 602 int r; 603 604 /* skip realm */ 605 for (p += 6; *p && *p != ':'; ++p) 606 /* nothing */ ; 607 if (!*p || strchr(++p, ':') == NULL) 608 return (-1); 609 if ((str = strdup(p)) == NULL) 610 return (-1); /* XXX */ 611 user = str; 612 pwd = strchr(str, ':'); 613 *pwd++ = '\0'; 614 r = _http_basic_auth(conn, hdr, user, pwd); 615 free(str); 616 return (r); 617 } 618 return (-1); 619} 620 621 622/***************************************************************************** 623 * Helper functions for connecting to a server or proxy 624 */ 625 626/* 627 * Connect to the correct HTTP server or proxy. 628 */ 629static conn_t * 630_http_connect(struct url *URL, struct url *purl, const char *flags) 631{ 632 conn_t *conn; 633 int verbose; 634 int af; 635 636#ifdef INET6 637 af = AF_UNSPEC; 638#else 639 af = AF_INET; 640#endif 641 642 verbose = CHECK_FLAG('v'); 643 if (CHECK_FLAG('4')) 644 af = AF_INET; 645#ifdef INET6 646 else if (CHECK_FLAG('6')) 647 af = AF_INET6; 648#endif 649 650 if (purl) { 651 URL = purl; 652 } else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) { 653 /* can't talk http to an ftp server */ 654 /* XXX should set an error code */ 655 return (NULL); 656 } 657 658 if ((conn = _fetch_connect(URL->host, URL->port, af, verbose)) == NULL) 659 /* _fetch_connect() has already set an error code */ 660 return (NULL); 661 return (conn); 662} 663 664static struct url * 665_http_get_proxy(void) 666{ 667 struct url *purl; 668 char *p; 669 670 if (((p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 671 (purl = fetchParseURL(p))) { 672 if (!*purl->scheme) 673 strcpy(purl->scheme, SCHEME_HTTP); 674 if (!purl->port) 675 purl->port = _fetch_default_proxy_port(purl->scheme); 676 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 677 return (purl); 678 fetchFreeURL(purl); 679 } 680 return (NULL); 681} 682 683static void 684_http_print_html(FILE *out, FILE *in) 685{ 686 size_t len; 687 char *line, *p, *q; 688 int comment, tag; 689 690 comment = tag = 0; 691 while ((line = fgetln(in, &len)) != NULL) { 692 while (len && isspace(line[len - 1])) 693 --len; 694 for (p = q = line; q < line + len; ++q) { 695 if (comment && *q == '-') { 696 if (q + 2 < line + len && 697 strcmp(q, "-->") == 0) { 698 tag = comment = 0; 699 q += 2; 700 } 701 } else if (tag && !comment && *q == '>') { 702 p = q + 1; 703 tag = 0; 704 } else if (!tag && *q == '<') { 705 if (q > p) 706 fwrite(p, q - p, 1, out); 707 tag = 1; 708 if (q + 3 < line + len && 709 strcmp(q, "<!--") == 0) { 710 comment = 1; 711 q += 3; 712 } 713 } 714 } 715 if (!tag && q > p) 716 fwrite(p, q - p, 1, out); 717 fputc('\n', out); 718 } 719} 720 721 722/***************************************************************************** 723 * Core 724 */ 725 726/* 727 * Send a request and process the reply 728 */ 729FILE * 730_http_request(struct url *URL, const char *op, struct url_stat *us, 731 struct url *purl, const char *flags) 732{ 733 conn_t *conn; 734 struct url *url, *new; 735 int chunked, direct, need_auth, noredirect, verbose; 736 int i, n; 737 off_t offset, clength, length, size; 738 time_t mtime; 739 const char *p; 740 FILE *f; 741 hdr_t h; 742 char *host; 743#ifdef INET6 744 char hbuf[MAXHOSTNAMELEN + 1]; 745#endif 746 747 direct = CHECK_FLAG('d'); 748 noredirect = CHECK_FLAG('A'); 749 verbose = CHECK_FLAG('v'); 750 751 if (direct && purl) { 752 fetchFreeURL(purl); 753 purl = NULL; 754 } 755 756 /* try the provided URL first */ 757 url = URL; 758 759 /* if the A flag is set, we only get one try */ 760 n = noredirect ? 1 : MAX_REDIRECT; 761 i = 0; 762 763 need_auth = 0; 764 do { 765 new = NULL; 766 chunked = 0; 767 offset = 0; 768 clength = -1; 769 length = -1; 770 size = -1; 771 mtime = 0; 772 773 /* check port */ 774 if (!url->port) 775 url->port = _fetch_default_port(url->scheme); 776 777 /* were we redirected to an FTP URL? */ 778 if (purl == NULL && strcmp(url->scheme, SCHEME_FTP) == 0) { 779 if (strcmp(op, "GET") == 0) 780 return (_ftp_request(url, "RETR", us, purl, flags)); 781 else if (strcmp(op, "HEAD") == 0) 782 return (_ftp_request(url, "STAT", us, purl, flags)); 783 } 784 785 /* connect to server or proxy */ 786 if ((conn = _http_connect(url, purl, flags)) == NULL) 787 goto ouch; 788 789 host = url->host; 790#ifdef INET6 791 if (strchr(url->host, ':')) { 792 snprintf(hbuf, sizeof(hbuf), "[%s]", url->host); 793 host = hbuf; 794 } 795#endif 796 797 /* send request */ 798 if (verbose) 799 _fetch_info("requesting %s://%s:%d%s", 800 url->scheme, host, url->port, url->doc); 801 if (purl) { 802 _http_cmd(conn, "%s %s://%s:%d%s HTTP/1.1", 803 op, url->scheme, host, url->port, url->doc); 804 } else { 805 _http_cmd(conn, "%s %s HTTP/1.1", 806 op, url->doc); 807 } 808 809 /* virtual host */ 810 if (url->port == _fetch_default_port(url->scheme)) 811 _http_cmd(conn, "Host: %s", host); 812 else 813 _http_cmd(conn, "Host: %s:%d", host, url->port); 814 815 /* proxy authorization */ 816 if (purl) { 817 if (*purl->user || *purl->pwd) 818 _http_basic_auth(conn, "Proxy-Authorization", 819 purl->user, purl->pwd); 820 else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL && *p != '\0') 821 _http_authorize(conn, "Proxy-Authorization", p); 822 } 823 824 /* server authorization */ 825 if (need_auth || *url->user || *url->pwd) { 826 if (*url->user || *url->pwd) 827 _http_basic_auth(conn, "Authorization", url->user, url->pwd); 828 else if ((p = getenv("HTTP_AUTH")) != NULL && *p != '\0') 829 _http_authorize(conn, "Authorization", p); 830 else if (fetchAuthMethod && fetchAuthMethod(url) == 0) { 831 _http_basic_auth(conn, "Authorization", url->user, url->pwd); 832 } else { 833 _http_seterr(HTTP_NEED_AUTH); 834 goto ouch; 835 } 836 } 837 838 /* other headers */ 839 if ((p = getenv("HTTP_USER_AGENT")) != NULL && *p != '\0') 840 _http_cmd(conn, "User-Agent: %s", p); 841 else 842 _http_cmd(conn, "User-Agent: %s " _LIBFETCH_VER, getprogname()); 843 if (url->offset) 844 _http_cmd(conn, "Range: bytes=%lld-", (long long)url->offset); 845 _http_cmd(conn, "Connection: close"); 846 _http_cmd(conn, ""); 847 848 /* get reply */ 849 switch (_http_get_reply(conn)) { 850 case HTTP_OK: 851 case HTTP_PARTIAL: 852 /* fine */ 853 break; 854 case HTTP_MOVED_PERM: 855 case HTTP_MOVED_TEMP: 856 case HTTP_SEE_OTHER: 857 /* 858 * Not so fine, but we still have to read the headers to 859 * get the new location. 860 */ 861 break; 862 case HTTP_NEED_AUTH: 863 if (need_auth) { 864 /* 865 * We already sent out authorization code, so there's 866 * nothing more we can do. 867 */ 868 _http_seterr(conn->err); 869 goto ouch; 870 } 871 /* try again, but send the password this time */ 872 if (verbose) 873 _fetch_info("server requires authorization"); 874 break; 875 case HTTP_NEED_PROXY_AUTH: 876 /* 877 * If we're talking to a proxy, we already sent our proxy 878 * authorization code, so there's nothing more we can do. 879 */ 880 _http_seterr(conn->err); 881 goto ouch; 882 case HTTP_PROTOCOL_ERROR: 883 /* fall through */ 884 case -1: 885 _fetch_syserr(); 886 goto ouch; 887 default: 888 _http_seterr(conn->err); 889 if (!verbose) 890 goto ouch; 891 /* fall through so we can get the full error message */ 892 } 893 894 /* get headers */ 895 do { 896 switch ((h = _http_next_header(conn, &p))) { 897 case hdr_syserror: 898 _fetch_syserr(); 899 goto ouch; 900 case hdr_error: 901 _http_seterr(HTTP_PROTOCOL_ERROR); 902 goto ouch; 903 case hdr_content_length: 904 _http_parse_length(p, &clength); 905 break; 906 case hdr_content_range: 907 _http_parse_range(p, &offset, &length, &size); 908 break; 909 case hdr_last_modified: 910 _http_parse_mtime(p, &mtime); 911 break; 912 case hdr_location: 913 if (!HTTP_REDIRECT(conn->err)) 914 break; 915 if (new) 916 free(new); 917 if (verbose) 918 _fetch_info("%d redirect to %s", conn->err, p); 919 if (*p == '/') 920 /* absolute path */ 921 new = fetchMakeURL(url->scheme, url->host, url->port, p, 922 url->user, url->pwd); 923 else 924 new = fetchParseURL(p); 925 if (new == NULL) { 926 /* XXX should set an error code */ 927 DEBUG(fprintf(stderr, "failed to parse new URL\n")); 928 goto ouch; 929 } 930 if (!*new->user && !*new->pwd) { 931 strcpy(new->user, url->user); 932 strcpy(new->pwd, url->pwd); 933 } 934 new->offset = url->offset; 935 new->length = url->length; 936 break; 937 case hdr_transfer_encoding: 938 /* XXX weak test*/ 939 chunked = (strcasecmp(p, "chunked") == 0); 940 break; 941 case hdr_www_authenticate: 942 if (conn->err != HTTP_NEED_AUTH) 943 break; 944 /* if we were smarter, we'd check the method and realm */ 945 break; 946 case hdr_end: 947 /* fall through */ 948 case hdr_unknown: 949 /* ignore */ 950 break; 951 } 952 } while (h > hdr_end); 953 954 /* we have a hit or an error */ 955 if (conn->err == HTTP_OK || conn->err == HTTP_PARTIAL || HTTP_ERROR(conn->err)) 956 break; 957 958 /* we need to provide authentication */ 959 if (conn->err == HTTP_NEED_AUTH) { 960 need_auth = 1; 961 _fetch_close(conn); 962 conn = NULL; 963 continue; 964 } 965 966 /* all other cases: we got a redirect */ 967 need_auth = 0; 968 _fetch_close(conn); 969 conn = NULL; 970 if (!new) { 971 DEBUG(fprintf(stderr, "redirect with no new location\n")); 972 break; 973 } 974 if (url != URL) 975 fetchFreeURL(url); 976 url = new; 977 } while (++i < n); 978 979 /* we failed, or ran out of retries */ 980 if (conn == NULL) { 981 _http_seterr(conn->err); 982 goto ouch; 983 } 984 985 DEBUG(fprintf(stderr, "offset %lld, length %lld," 986 " size %lld, clength %lld\n", 987 (long long)offset, (long long)length, 988 (long long)size, (long long)clength)); 989 990 /* check for inconsistencies */ 991 if (clength != -1 && length != -1 && clength != length) { 992 _http_seterr(HTTP_PROTOCOL_ERROR); 993 goto ouch; 994 } 995 if (clength == -1) 996 clength = length; 997 if (clength != -1) 998 length = offset + clength; 999 if (length != -1 && size != -1 && length != size) { 1000 _http_seterr(HTTP_PROTOCOL_ERROR); 1001 goto ouch; 1002 } 1003 if (size == -1) 1004 size = length; 1005 1006 /* fill in stats */ 1007 if (us) { 1008 us->size = size; 1009 us->atime = us->mtime = mtime; 1010 } 1011 1012 /* too far? */ 1013 if (offset > URL->offset) { 1014 _http_seterr(HTTP_PROTOCOL_ERROR); 1015 goto ouch; 1016 } 1017 1018 /* report back real offset and size */ 1019 URL->offset = offset; 1020 URL->length = clength; 1021 1022 /* wrap it up in a FILE */ 1023 if (chunked) { 1024 f = _http_funopen(conn); 1025 } else { 1026 f = fdopen(dup(conn->sd), "r"); 1027 _fetch_close(conn); 1028 } 1029 if (f == NULL) { 1030 _fetch_syserr(); 1031 goto ouch; 1032 } 1033 1034 if (url != URL) 1035 fetchFreeURL(url); 1036 if (purl) 1037 fetchFreeURL(purl); 1038 1039 if (HTTP_ERROR(conn->err)) { 1040 _http_print_html(stderr, f); 1041 fclose(f); 1042 f = NULL; 1043 } 1044 1045 return (f); 1046 1047ouch: 1048 if (url != URL) 1049 fetchFreeURL(url); 1050 if (purl) 1051 fetchFreeURL(purl); 1052 if (conn != NULL) 1053 _fetch_close(conn); 1054 return (NULL); 1055} 1056 1057 1058/***************************************************************************** 1059 * Entry points 1060 */ 1061 1062/* 1063 * Retrieve and stat a file by HTTP 1064 */ 1065FILE * 1066fetchXGetHTTP(struct url *URL, struct url_stat *us, const char *flags) 1067{ 1068 return (_http_request(URL, "GET", us, _http_get_proxy(), flags)); 1069} 1070 1071/* 1072 * Retrieve a file by HTTP 1073 */ 1074FILE * 1075fetchGetHTTP(struct url *URL, const char *flags) 1076{ 1077 return (fetchXGetHTTP(URL, NULL, flags)); 1078} 1079 1080/* 1081 * Store a file by HTTP 1082 */ 1083FILE * 1084fetchPutHTTP(struct url *URL __unused, const char *flags __unused) 1085{ 1086 warnx("fetchPutHTTP(): not implemented"); 1087 return (NULL); 1088} 1089 1090/* 1091 * Get an HTTP document's metadata 1092 */ 1093int 1094fetchStatHTTP(struct url *URL, struct url_stat *us, const char *flags) 1095{ 1096 FILE *f; 1097 1098 if ((f = _http_request(URL, "HEAD", us, _http_get_proxy(), flags)) == NULL) 1099 return (-1); 1100 fclose(f); 1101 return (0); 1102} 1103 1104/* 1105 * List a directory 1106 */ 1107struct url_ent * 1108fetchListHTTP(struct url *url __unused, const char *flags __unused) 1109{ 1110 warnx("fetchListHTTP(): not implemented"); 1111 return (NULL); 1112} 1113