http.c revision 231247
137535Sdes/*- 2135546Sdes * Copyright (c) 2000-2004 Dag-Erling Co�dan Sm�rgrav 337535Sdes * All rights reserved. 437535Sdes * 537535Sdes * Redistribution and use in source and binary forms, with or without 637535Sdes * modification, are permitted provided that the following conditions 737535Sdes * are met: 837535Sdes * 1. Redistributions of source code must retain the above copyright 937535Sdes * notice, this list of conditions and the following disclaimer 1037535Sdes * in this position and unchanged. 1137535Sdes * 2. Redistributions in binary form must reproduce the above copyright 1237535Sdes * notice, this list of conditions and the following disclaimer in the 1337535Sdes * documentation and/or other materials provided with the distribution. 1437535Sdes * 3. The name of the author may not be used to endorse or promote products 1563012Sdes * derived from this software without specific prior written permission. 1637535Sdes * 1737535Sdes * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 1837535Sdes * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 1937535Sdes * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 2037535Sdes * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 2137535Sdes * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 2237535Sdes * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2337535Sdes * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2437535Sdes * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2537535Sdes * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 2637535Sdes * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2737535Sdes */ 2837535Sdes 2984203Sdillon#include <sys/cdefs.h> 3084203Sdillon__FBSDID("$FreeBSD: stable/9/lib/libfetch/http.c 231247 2012-02-09 06:48:04Z bapt $"); 3184203Sdillon 3263236Sdes/* 3363236Sdes * The following copyright applies to the base64 code: 3463236Sdes * 3563236Sdes *- 3663236Sdes * Copyright 1997 Massachusetts Institute of Technology 3763236Sdes * 3863236Sdes * Permission to use, copy, modify, and distribute this software and 3963236Sdes * its documentation for any purpose and without fee is hereby 4063236Sdes * granted, provided that both the above copyright notice and this 4163236Sdes * permission notice appear in all copies, that both the above 4263236Sdes * copyright notice and this permission notice appear in all 4363236Sdes * supporting documentation, and that the name of M.I.T. not be used 4463236Sdes * in advertising or publicity pertaining to distribution of the 4563236Sdes * software without specific, written prior permission. M.I.T. makes 4663236Sdes * no representations about the suitability of this software for any 4763236Sdes * purpose. It is provided "as is" without express or implied 4863236Sdes * warranty. 4990267Sdes * 5063236Sdes * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 5163236Sdes * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 5263236Sdes * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 5363236Sdes * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 5463236Sdes * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 5563236Sdes * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 5663236Sdes * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 5763236Sdes * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 5863236Sdes * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 5963236Sdes * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 6063236Sdes * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 6163236Sdes * SUCH DAMAGE. 6263236Sdes */ 6363236Sdes 6437535Sdes#include <sys/param.h> 6560737Sume#include <sys/socket.h> 66186124Smurray#include <sys/time.h> 6737535Sdes 6863012Sdes#include <ctype.h> 6937535Sdes#include <err.h> 7063012Sdes#include <errno.h> 7160376Sdes#include <locale.h> 7260189Sdes#include <netdb.h> 7337608Sdes#include <stdarg.h> 7437535Sdes#include <stdio.h> 7537535Sdes#include <stdlib.h> 7637535Sdes#include <string.h> 7760376Sdes#include <time.h> 7837535Sdes#include <unistd.h> 79202613Sdes#include <md5.h> 8037535Sdes 81141958Skbyanc#include <netinet/in.h> 82141958Skbyanc#include <netinet/tcp.h> 83141958Skbyanc 8437535Sdes#include "fetch.h" 8540939Sdes#include "common.h" 8641862Sdes#include "httperr.h" 8737535Sdes 8863012Sdes/* Maximum number of redirects to follow */ 8963012Sdes#define MAX_REDIRECT 5 9037535Sdes 9163012Sdes/* Symbolic names for reply codes we care about */ 9263012Sdes#define HTTP_OK 200 9363012Sdes#define HTTP_PARTIAL 206 9463012Sdes#define HTTP_MOVED_PERM 301 9563012Sdes#define HTTP_MOVED_TEMP 302 9663012Sdes#define HTTP_SEE_OTHER 303 97186124Smurray#define HTTP_NOT_MODIFIED 304 98169386Sdes#define HTTP_TEMP_REDIRECT 307 9963012Sdes#define HTTP_NEED_AUTH 401 10087317Sdes#define HTTP_NEED_PROXY_AUTH 407 101125696Sdes#define HTTP_BAD_RANGE 416 10263012Sdes#define HTTP_PROTOCOL_ERROR 999 10360196Sdes 10463012Sdes#define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \ 10590267Sdes || (xyz) == HTTP_MOVED_TEMP \ 106169386Sdes || (xyz) == HTTP_TEMP_REDIRECT \ 10790267Sdes || (xyz) == HTTP_SEE_OTHER) 10863012Sdes 10988771Sdes#define HTTP_ERROR(xyz) ((xyz) > 400 && (xyz) < 599) 11063012Sdes 11190267Sdes 11263012Sdes/***************************************************************************** 11363012Sdes * I/O functions for decoding chunked streams 11463012Sdes */ 11563012Sdes 11697859Sdesstruct httpio 11737535Sdes{ 11897858Sdes conn_t *conn; /* connection */ 11997866Sdes int chunked; /* chunked mode */ 12097858Sdes char *buf; /* chunk buffer */ 12197866Sdes size_t bufsize; /* size of chunk buffer */ 12297866Sdes ssize_t buflen; /* amount of data currently in buffer */ 12397866Sdes int bufpos; /* current read offset in buffer */ 12497858Sdes int eof; /* end-of-file flag */ 12597858Sdes int error; /* error flag */ 12697858Sdes size_t chunksize; /* remaining size of current chunk */ 12763281Sdes#ifndef NDEBUG 12890267Sdes size_t total; 12963012Sdes#endif 13037535Sdes}; 13137535Sdes 13237608Sdes/* 13363012Sdes * Get next chunk header 13437608Sdes */ 13537608Sdesstatic int 136174588Sdeshttp_new_chunk(struct httpio *io) 13737608Sdes{ 13890267Sdes char *p; 13990267Sdes 140174588Sdes if (fetch_getln(io->conn) == -1) 14190267Sdes return (-1); 14290267Sdes 143174761Sdes if (io->conn->buflen < 2 || !isxdigit((unsigned char)*io->conn->buf)) 14490267Sdes return (-1); 14590267Sdes 146174761Sdes for (p = io->conn->buf; *p && !isspace((unsigned char)*p); ++p) { 14790267Sdes if (*p == ';') 14890267Sdes break; 149174761Sdes if (!isxdigit((unsigned char)*p)) 15090267Sdes return (-1); 151174761Sdes if (isdigit((unsigned char)*p)) { 15297859Sdes io->chunksize = io->chunksize * 16 + 15390267Sdes *p - '0'; 15490267Sdes } else { 15597859Sdes io->chunksize = io->chunksize * 16 + 156176036Sdes 10 + tolower((unsigned char)*p) - 'a'; 15790267Sdes } 15890267Sdes } 15990267Sdes 16063281Sdes#ifndef NDEBUG 16190267Sdes if (fetchDebug) { 16297859Sdes io->total += io->chunksize; 16397859Sdes if (io->chunksize == 0) 164106207Sdes fprintf(stderr, "%s(): end of last chunk\n", __func__); 16590267Sdes else 166106207Sdes fprintf(stderr, "%s(): new chunk: %lu (%lu)\n", 167106207Sdes __func__, (unsigned long)io->chunksize, 168106207Sdes (unsigned long)io->total); 16990267Sdes } 17063012Sdes#endif 17190267Sdes 17297859Sdes return (io->chunksize); 17337608Sdes} 17437608Sdes 17537608Sdes/* 17697866Sdes * Grow the input buffer to at least len bytes 17797866Sdes */ 17897866Sdesstatic inline int 179174588Sdeshttp_growbuf(struct httpio *io, size_t len) 18097866Sdes{ 18197866Sdes char *tmp; 18297866Sdes 18397866Sdes if (io->bufsize >= len) 18497866Sdes return (0); 18597866Sdes 18697866Sdes if ((tmp = realloc(io->buf, len)) == NULL) 18797866Sdes return (-1); 18897866Sdes io->buf = tmp; 18997866Sdes io->bufsize = len; 190106044Sdes return (0); 19197866Sdes} 19297866Sdes 19397866Sdes/* 19437608Sdes * Fill the input buffer, do chunk decoding on the fly 19537608Sdes */ 19663012Sdesstatic int 197174588Sdeshttp_fillbuf(struct httpio *io, size_t len) 19837535Sdes{ 199231247Sbapt ssize_t nbytes; 200231247Sbapt 20197859Sdes if (io->error) 20290267Sdes return (-1); 20397859Sdes if (io->eof) 20490267Sdes return (0); 20590267Sdes 20697866Sdes if (io->chunked == 0) { 207174588Sdes if (http_growbuf(io, len) == -1) 20897866Sdes return (-1); 209231247Sbapt if ((nbytes = fetch_read(io->conn, io->buf, len)) == -1) { 210231247Sbapt io->error = errno; 21197866Sdes return (-1); 212106185Sdes } 213231247Sbapt io->buflen = nbytes; 21497866Sdes io->bufpos = 0; 21597866Sdes return (io->buflen); 21697866Sdes } 21797866Sdes 21897859Sdes if (io->chunksize == 0) { 219174588Sdes switch (http_new_chunk(io)) { 22090267Sdes case -1: 22197859Sdes io->error = 1; 22290267Sdes return (-1); 22390267Sdes case 0: 22497859Sdes io->eof = 1; 22590267Sdes return (0); 22690267Sdes } 22737535Sdes } 22863012Sdes 22997866Sdes if (len > io->chunksize) 23097866Sdes len = io->chunksize; 231174588Sdes if (http_growbuf(io, len) == -1) 23290267Sdes return (-1); 233231247Sbapt if ((nbytes = fetch_read(io->conn, io->buf, len)) == -1) { 234231247Sbapt io->error = errno; 23597866Sdes return (-1); 236106185Sdes } 237231247Sbapt io->buflen = nbytes; 23897866Sdes io->chunksize -= io->buflen; 23990267Sdes 24097859Sdes if (io->chunksize == 0) { 24197856Sdes char endl[2]; 24297856Sdes 243174588Sdes if (fetch_read(io->conn, endl, 2) != 2 || 24497856Sdes endl[0] != '\r' || endl[1] != '\n') 24590267Sdes return (-1); 24690267Sdes } 24790267Sdes 24897866Sdes io->bufpos = 0; 24990267Sdes 25097866Sdes return (io->buflen); 25137535Sdes} 25237535Sdes 25337608Sdes/* 25437608Sdes * Read function 25537608Sdes */ 25637535Sdesstatic int 257174588Sdeshttp_readfn(void *v, char *buf, int len) 25837535Sdes{ 25997859Sdes struct httpio *io = (struct httpio *)v; 26090267Sdes int l, pos; 26163012Sdes 26297859Sdes if (io->error) 26390267Sdes return (-1); 26497859Sdes if (io->eof) 26590267Sdes return (0); 26663012Sdes 26790267Sdes for (pos = 0; len > 0; pos += l, len -= l) { 26890267Sdes /* empty buffer */ 26997866Sdes if (!io->buf || io->bufpos == io->buflen) 270174588Sdes if (http_fillbuf(io, len) < 1) 27190267Sdes break; 27297866Sdes l = io->buflen - io->bufpos; 27390267Sdes if (len < l) 27490267Sdes l = len; 275176105Sdes memcpy(buf + pos, io->buf + io->bufpos, l); 27697866Sdes io->bufpos += l; 27790267Sdes } 27837535Sdes 279231247Sbapt if (!pos && io->error) { 280231247Sbapt if (io->error == EINTR) 281231247Sbapt io->error = 0; 28290267Sdes return (-1); 283231247Sbapt } 28490267Sdes return (pos); 28537535Sdes} 28637535Sdes 28737608Sdes/* 28837608Sdes * Write function 28937608Sdes */ 29037535Sdesstatic int 291174588Sdeshttp_writefn(void *v, const char *buf, int len) 29237535Sdes{ 29397859Sdes struct httpio *io = (struct httpio *)v; 29490267Sdes 295174588Sdes return (fetch_write(io->conn, buf, len)); 29637535Sdes} 29737535Sdes 29837608Sdes/* 29937608Sdes * Close function 30037608Sdes */ 30137535Sdesstatic int 302174588Sdeshttp_closefn(void *v) 30337535Sdes{ 30497859Sdes struct httpio *io = (struct httpio *)v; 30590267Sdes int r; 30663012Sdes 307174588Sdes r = fetch_close(io->conn); 30897859Sdes if (io->buf) 30997859Sdes free(io->buf); 31097859Sdes free(io); 31190267Sdes return (r); 31237535Sdes} 31337535Sdes 31437608Sdes/* 31563012Sdes * Wrap a file descriptor up 31637608Sdes */ 31763012Sdesstatic FILE * 318174588Sdeshttp_funopen(conn_t *conn, int chunked) 31937535Sdes{ 32097859Sdes struct httpio *io; 32190267Sdes FILE *f; 32263012Sdes 323109967Sdes if ((io = calloc(1, sizeof(*io))) == NULL) { 324174588Sdes fetch_syserr(); 32590267Sdes return (NULL); 32690267Sdes } 32797859Sdes io->conn = conn; 32897866Sdes io->chunked = chunked; 329174588Sdes f = funopen(io, http_readfn, http_writefn, NULL, http_closefn); 33090267Sdes if (f == NULL) { 331174588Sdes fetch_syserr(); 33297859Sdes free(io); 33390267Sdes return (NULL); 33490267Sdes } 33590267Sdes return (f); 33663012Sdes} 33763012Sdes 33890267Sdes 33963012Sdes/***************************************************************************** 34063012Sdes * Helper functions for talking to the server and parsing its replies 34163012Sdes */ 34263012Sdes 34363012Sdes/* Header types */ 34463012Sdestypedef enum { 34590267Sdes hdr_syserror = -2, 34690267Sdes hdr_error = -1, 34790267Sdes hdr_end = 0, 34890267Sdes hdr_unknown = 1, 34990267Sdes hdr_content_length, 35090267Sdes hdr_content_range, 35190267Sdes hdr_last_modified, 35290267Sdes hdr_location, 35390267Sdes hdr_transfer_encoding, 354202613Sdes hdr_www_authenticate, 355202613Sdes hdr_proxy_authenticate, 35685093Sdes} hdr_t; 35763012Sdes 35863012Sdes/* Names of interesting headers */ 35963012Sdesstatic struct { 36090267Sdes hdr_t num; 36190267Sdes const char *name; 36263012Sdes} hdr_names[] = { 36390267Sdes { hdr_content_length, "Content-Length" }, 36490267Sdes { hdr_content_range, "Content-Range" }, 36590267Sdes { hdr_last_modified, "Last-Modified" }, 36690267Sdes { hdr_location, "Location" }, 36790267Sdes { hdr_transfer_encoding, "Transfer-Encoding" }, 36890267Sdes { hdr_www_authenticate, "WWW-Authenticate" }, 369202613Sdes { hdr_proxy_authenticate, "Proxy-Authenticate" }, 37090267Sdes { hdr_unknown, NULL }, 37163012Sdes}; 37263012Sdes 37363012Sdes/* 37463012Sdes * Send a formatted line; optionally echo to terminal 37563012Sdes */ 37663012Sdesstatic int 377174588Sdeshttp_cmd(conn_t *conn, const char *fmt, ...) 37863012Sdes{ 37990267Sdes va_list ap; 38090267Sdes size_t len; 38190267Sdes char *msg; 38290267Sdes int r; 38363012Sdes 38490267Sdes va_start(ap, fmt); 38590267Sdes len = vasprintf(&msg, fmt, ap); 38690267Sdes va_end(ap); 38790267Sdes 38890267Sdes if (msg == NULL) { 38990267Sdes errno = ENOMEM; 390174588Sdes fetch_syserr(); 39190267Sdes return (-1); 39290267Sdes } 39390267Sdes 394174588Sdes r = fetch_putln(conn, msg, len); 39590267Sdes free(msg); 39690267Sdes 39790267Sdes if (r == -1) { 398174588Sdes fetch_syserr(); 39990267Sdes return (-1); 40090267Sdes } 40190267Sdes 40290267Sdes return (0); 40363012Sdes} 40463012Sdes 40563012Sdes/* 40663012Sdes * Get and parse status line 40763012Sdes */ 40863012Sdesstatic int 409174588Sdeshttp_get_reply(conn_t *conn) 41063012Sdes{ 41190267Sdes char *p; 41290267Sdes 413174588Sdes if (fetch_getln(conn) == -1) 41490267Sdes return (-1); 41590267Sdes /* 41690267Sdes * A valid status line looks like "HTTP/m.n xyz reason" where m 41790267Sdes * and n are the major and minor protocol version numbers and xyz 41890267Sdes * is the reply code. 41990267Sdes * Unfortunately, there are servers out there (NCSA 1.5.1, to name 42090267Sdes * just one) that do not send a version number, so we can't rely 42190267Sdes * on finding one, but if we do, insist on it being 1.0 or 1.1. 42290267Sdes * We don't care about the reason phrase. 42390267Sdes */ 42497856Sdes if (strncmp(conn->buf, "HTTP", 4) != 0) 42590267Sdes return (HTTP_PROTOCOL_ERROR); 42697856Sdes p = conn->buf + 4; 42790267Sdes if (*p == '/') { 42890267Sdes if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1')) 42990267Sdes return (HTTP_PROTOCOL_ERROR); 43090267Sdes p += 4; 43190267Sdes } 432174761Sdes if (*p != ' ' || 433174761Sdes !isdigit((unsigned char)p[1]) || 434174761Sdes !isdigit((unsigned char)p[2]) || 435174761Sdes !isdigit((unsigned char)p[3])) 43690267Sdes return (HTTP_PROTOCOL_ERROR); 43790267Sdes 43897856Sdes conn->err = (p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0'); 43997856Sdes return (conn->err); 44037535Sdes} 44137535Sdes 44237608Sdes/* 44390267Sdes * Check a header; if the type matches the given string, return a pointer 44490267Sdes * to the beginning of the value. 44563012Sdes */ 44675891Sarchiestatic const char * 447174588Sdeshttp_match(const char *str, const char *hdr) 44863012Sdes{ 449176036Sdes while (*str && *hdr && 450176036Sdes tolower((unsigned char)*str++) == tolower((unsigned char)*hdr++)) 45190267Sdes /* nothing */; 45290267Sdes if (*str || *hdr != ':') 45390267Sdes return (NULL); 454174761Sdes while (*hdr && isspace((unsigned char)*++hdr)) 45590267Sdes /* nothing */; 45690267Sdes return (hdr); 45763012Sdes} 45863012Sdes 459202613Sdes 46063012Sdes/* 461202613Sdes * Get the next header and return the appropriate symbolic code. We 462202613Sdes * need to read one line ahead for checking for a continuation line 463202613Sdes * belonging to the current header (continuation lines start with 464221821Sdes * white space). 465202613Sdes * 466202613Sdes * We get called with a fresh line already in the conn buffer, either 467202613Sdes * from the previous http_next_header() invocation, or, the first 468202613Sdes * time, from a fetch_getln() performed by our caller. 469202613Sdes * 470202613Sdes * This stops when we encounter an empty line (we dont read beyond the header 471202613Sdes * area). 472221821Sdes * 473202613Sdes * Note that the "headerbuf" is just a place to return the result. Its 474202613Sdes * contents are not used for the next call. This means that no cleanup 475202613Sdes * is needed when ie doing another connection, just call the cleanup when 476202613Sdes * fully done to deallocate memory. 47763012Sdes */ 478202613Sdes 479202613Sdes/* Limit the max number of continuation lines to some reasonable value */ 480202613Sdes#define HTTP_MAX_CONT_LINES 10 481202613Sdes 482202613Sdes/* Place into which to build a header from one or several lines */ 483202613Sdestypedef struct { 484202613Sdes char *buf; /* buffer */ 485202613Sdes size_t bufsize; /* buffer size */ 486202613Sdes size_t buflen; /* length of buffer contents */ 487202613Sdes} http_headerbuf_t; 488202613Sdes 489202613Sdesstatic void 490202613Sdesinit_http_headerbuf(http_headerbuf_t *buf) 49163012Sdes{ 492202613Sdes buf->buf = NULL; 493202613Sdes buf->bufsize = 0; 494202613Sdes buf->buflen = 0; 495202613Sdes} 49690267Sdes 497221821Sdesstatic void 498202613Sdesclean_http_headerbuf(http_headerbuf_t *buf) 499202613Sdes{ 500202613Sdes if (buf->buf) 501202613Sdes free(buf->buf); 502202613Sdes init_http_headerbuf(buf); 503202613Sdes} 504202613Sdes 505202613Sdes/* Remove whitespace at the end of the buffer */ 506221821Sdesstatic void 507202613Sdeshttp_conn_trimright(conn_t *conn) 508202613Sdes{ 509221821Sdes while (conn->buflen && 510202613Sdes isspace((unsigned char)conn->buf[conn->buflen - 1])) 51197856Sdes conn->buflen--; 51297856Sdes conn->buf[conn->buflen] = '\0'; 513202613Sdes} 514202613Sdes 515202613Sdesstatic hdr_t 516202613Sdeshttp_next_header(conn_t *conn, http_headerbuf_t *hbuf, const char **p) 517202613Sdes{ 518221820Sdes unsigned int i, len; 519202613Sdes 520221821Sdes /* 521202613Sdes * Have to do the stripping here because of the first line. So 522221821Sdes * it's done twice for the subsequent lines. No big deal 523202613Sdes */ 524202613Sdes http_conn_trimright(conn); 52597856Sdes if (conn->buflen == 0) 52697856Sdes return (hdr_end); 527202613Sdes 528202613Sdes /* Copy the line to the headerbuf */ 529202613Sdes if (hbuf->bufsize < conn->buflen + 1) { 530202613Sdes if ((hbuf->buf = realloc(hbuf->buf, conn->buflen + 1)) == NULL) 531202613Sdes return (hdr_syserror); 532202613Sdes hbuf->bufsize = conn->buflen + 1; 533202613Sdes } 534202613Sdes strcpy(hbuf->buf, conn->buf); 535202613Sdes hbuf->buflen = conn->buflen; 536202613Sdes 537221821Sdes /* 538202613Sdes * Fetch possible continuation lines. Stop at 1st non-continuation 539221821Sdes * and leave it in the conn buffer 540221821Sdes */ 541202613Sdes for (i = 0; i < HTTP_MAX_CONT_LINES; i++) { 542202613Sdes if (fetch_getln(conn) == -1) 543202613Sdes return (hdr_syserror); 544202613Sdes 545221821Sdes /* 546202613Sdes * Note: we carry on the idea from the previous version 547202613Sdes * that a pure whitespace line is equivalent to an empty 548202613Sdes * one (so it's not continuation and will be handled when 549221821Sdes * we are called next) 550202613Sdes */ 551202613Sdes http_conn_trimright(conn); 552202613Sdes if (conn->buf[0] != ' ' && conn->buf[0] != "\t"[0]) 553202613Sdes break; 554202613Sdes 555202613Sdes /* Got a continuation line. Concatenate to previous */ 556202613Sdes len = hbuf->buflen + conn->buflen; 557202613Sdes if (hbuf->bufsize < len + 1) { 558202613Sdes len *= 2; 559202613Sdes if ((hbuf->buf = realloc(hbuf->buf, len + 1)) == NULL) 560202613Sdes return (hdr_syserror); 561202613Sdes hbuf->bufsize = len + 1; 562202613Sdes } 563202613Sdes strcpy(hbuf->buf + hbuf->buflen, conn->buf); 564202613Sdes hbuf->buflen += conn->buflen; 565221821Sdes } 566202613Sdes 56790267Sdes /* 56890267Sdes * We could check for malformed headers but we don't really care. 56990267Sdes * A valid header starts with a token immediately followed by a 57090267Sdes * colon; a token is any sequence of non-control, non-whitespace 57190267Sdes * characters except "()<>@,;:\\\"{}". 57290267Sdes */ 57390267Sdes for (i = 0; hdr_names[i].num != hdr_unknown; i++) 574202613Sdes if ((*p = http_match(hdr_names[i].name, hbuf->buf)) != NULL) 57590267Sdes return (hdr_names[i].num); 576202613Sdes 57790267Sdes return (hdr_unknown); 57863012Sdes} 57963012Sdes 580202613Sdes/************************** 581202613Sdes * [Proxy-]Authenticate header parsing 582202613Sdes */ 583202613Sdes 584221821Sdes/* 585221821Sdes * Read doublequote-delimited string into output buffer obuf (allocated 586202613Sdes * by caller, whose responsibility it is to ensure that it's big enough) 587202613Sdes * cp points to the first char after the initial '"' 588221821Sdes * Handles \ quoting 589221821Sdes * Returns pointer to the first char after the terminating double quote, or 590202613Sdes * NULL for error. 591202613Sdes */ 592202613Sdesstatic const char * 593202613Sdeshttp_parse_headerstring(const char *cp, char *obuf) 594202613Sdes{ 595202613Sdes for (;;) { 596202613Sdes switch (*cp) { 597202613Sdes case 0: /* Unterminated string */ 598202613Sdes *obuf = 0; 599202613Sdes return (NULL); 600202613Sdes case '"': /* Ending quote */ 601202613Sdes *obuf = 0; 602202613Sdes return (++cp); 603202613Sdes case '\\': 604202613Sdes if (*++cp == 0) { 605202613Sdes *obuf = 0; 606202613Sdes return (NULL); 607202613Sdes } 608202613Sdes /* FALLTHROUGH */ 609202613Sdes default: 610202613Sdes *obuf++ = *cp++; 611202613Sdes } 612202613Sdes } 613202613Sdes} 614202613Sdes 615202613Sdes/* Http auth challenge schemes */ 616202613Sdestypedef enum {HTTPAS_UNKNOWN, HTTPAS_BASIC,HTTPAS_DIGEST} http_auth_schemes_t; 617202613Sdes 618202613Sdes/* Data holder for a Basic or Digest challenge. */ 619202613Sdestypedef struct { 620202613Sdes http_auth_schemes_t scheme; 621202613Sdes char *realm; 622202613Sdes char *qop; 623202613Sdes char *nonce; 624202613Sdes char *opaque; 625202613Sdes char *algo; 626202613Sdes int stale; 627202613Sdes int nc; /* Nonce count */ 628202613Sdes} http_auth_challenge_t; 629202613Sdes 630221821Sdesstatic void 631202613Sdesinit_http_auth_challenge(http_auth_challenge_t *b) 632202613Sdes{ 633202613Sdes b->scheme = HTTPAS_UNKNOWN; 634202613Sdes b->realm = b->qop = b->nonce = b->opaque = b->algo = NULL; 635202613Sdes b->stale = b->nc = 0; 636202613Sdes} 637202613Sdes 638221821Sdesstatic void 639202613Sdesclean_http_auth_challenge(http_auth_challenge_t *b) 640202613Sdes{ 641221821Sdes if (b->realm) 642202613Sdes free(b->realm); 643221821Sdes if (b->qop) 644202613Sdes free(b->qop); 645221821Sdes if (b->nonce) 646202613Sdes free(b->nonce); 647221821Sdes if (b->opaque) 648202613Sdes free(b->opaque); 649221821Sdes if (b->algo) 650202613Sdes free(b->algo); 651202613Sdes init_http_auth_challenge(b); 652202613Sdes} 653202613Sdes 654202613Sdes/* Data holder for an array of challenges offered in an http response. */ 655202613Sdes#define MAX_CHALLENGES 10 656202613Sdestypedef struct { 657202613Sdes http_auth_challenge_t *challenges[MAX_CHALLENGES]; 658202613Sdes int count; /* Number of parsed challenges in the array */ 659202613Sdes int valid; /* We did parse an authenticate header */ 660202613Sdes} http_auth_challenges_t; 661202613Sdes 662221821Sdesstatic void 663202613Sdesinit_http_auth_challenges(http_auth_challenges_t *cs) 664202613Sdes{ 665202613Sdes int i; 666202613Sdes for (i = 0; i < MAX_CHALLENGES; i++) 667202613Sdes cs->challenges[i] = NULL; 668202613Sdes cs->count = cs->valid = 0; 669202613Sdes} 670202613Sdes 671221821Sdesstatic void 672202613Sdesclean_http_auth_challenges(http_auth_challenges_t *cs) 673202613Sdes{ 674202613Sdes int i; 675202613Sdes /* We rely on non-zero pointers being allocated, not on the count */ 676202613Sdes for (i = 0; i < MAX_CHALLENGES; i++) { 677202613Sdes if (cs->challenges[i] != NULL) { 678202613Sdes clean_http_auth_challenge(cs->challenges[i]); 679202613Sdes free(cs->challenges[i]); 680202613Sdes } 681202613Sdes } 682202613Sdes init_http_auth_challenges(cs); 683202613Sdes} 684202613Sdes 685221821Sdes/* 686202613Sdes * Enumeration for lexical elements. Separators will be returned as their own 687202613Sdes * ascii value 688202613Sdes */ 689202613Sdestypedef enum {HTTPHL_WORD=256, HTTPHL_STRING=257, HTTPHL_END=258, 690202613Sdes HTTPHL_ERROR = 259} http_header_lex_t; 691202613Sdes 692221821Sdes/* 693202613Sdes * Determine what kind of token comes next and return possible value 694202613Sdes * in buf, which is supposed to have been allocated big enough by 695221821Sdes * caller. Advance input pointer and return element type. 696202613Sdes */ 697221821Sdesstatic int 698202613Sdeshttp_header_lex(const char **cpp, char *buf) 699202613Sdes{ 700202613Sdes size_t l; 701202613Sdes /* Eat initial whitespace */ 702202613Sdes *cpp += strspn(*cpp, " \t"); 703202613Sdes if (**cpp == 0) 704202613Sdes return (HTTPHL_END); 705202613Sdes 706202613Sdes /* Separator ? */ 707202613Sdes if (**cpp == ',' || **cpp == '=') 708202613Sdes return (*((*cpp)++)); 709202613Sdes 710202613Sdes /* String ? */ 711202613Sdes if (**cpp == '"') { 712202613Sdes *cpp = http_parse_headerstring(++*cpp, buf); 713202613Sdes if (*cpp == NULL) 714202613Sdes return (HTTPHL_ERROR); 715202613Sdes return (HTTPHL_STRING); 716202613Sdes } 717202613Sdes 718202613Sdes /* Read other token, until separator or whitespace */ 719202613Sdes l = strcspn(*cpp, " \t,="); 720202613Sdes memcpy(buf, *cpp, l); 721202613Sdes buf[l] = 0; 722202613Sdes *cpp += l; 723202613Sdes return (HTTPHL_WORD); 724202613Sdes} 725202613Sdes 726221821Sdes/* 727202613Sdes * Read challenges from http xxx-authenticate header and accumulate them 728202613Sdes * in the challenges list structure. 729202613Sdes * 730202613Sdes * Headers with multiple challenges are specified by rfc2617, but 731202613Sdes * servers (ie: squid) often send them in separate headers instead, 732202613Sdes * which in turn is forbidden by the http spec (multiple headers with 733202613Sdes * the same name are only allowed for pure comma-separated lists, see 734202613Sdes * rfc2616 sec 4.2). 735202613Sdes * 736202613Sdes * We support both approaches anyway 737202613Sdes */ 738221821Sdesstatic int 739202613Sdeshttp_parse_authenticate(const char *cp, http_auth_challenges_t *cs) 740202613Sdes{ 741202613Sdes int ret = -1; 742202613Sdes http_header_lex_t lex; 743202613Sdes char *key = malloc(strlen(cp) + 1); 744202613Sdes char *value = malloc(strlen(cp) + 1); 745202613Sdes char *buf = malloc(strlen(cp) + 1); 746202613Sdes 747202613Sdes if (key == NULL || value == NULL || buf == NULL) { 748202613Sdes fetch_syserr(); 749202613Sdes goto out; 750202613Sdes } 751202613Sdes 752202613Sdes /* In any case we've seen the header and we set the valid bit */ 753202613Sdes cs->valid = 1; 754202613Sdes 755202613Sdes /* Need word first */ 756202613Sdes lex = http_header_lex(&cp, key); 757202613Sdes if (lex != HTTPHL_WORD) 758202613Sdes goto out; 759202613Sdes 760202613Sdes /* Loop on challenges */ 761202613Sdes for (; cs->count < MAX_CHALLENGES; cs->count++) { 762221821Sdes cs->challenges[cs->count] = 763202613Sdes malloc(sizeof(http_auth_challenge_t)); 764202613Sdes if (cs->challenges[cs->count] == NULL) { 765202613Sdes fetch_syserr(); 766202613Sdes goto out; 767202613Sdes } 768202613Sdes init_http_auth_challenge(cs->challenges[cs->count]); 769202613Sdes if (!strcasecmp(key, "basic")) { 770202613Sdes cs->challenges[cs->count]->scheme = HTTPAS_BASIC; 771202613Sdes } else if (!strcasecmp(key, "digest")) { 772202613Sdes cs->challenges[cs->count]->scheme = HTTPAS_DIGEST; 773202613Sdes } else { 774202613Sdes cs->challenges[cs->count]->scheme = HTTPAS_UNKNOWN; 775221821Sdes /* 776221821Sdes * Continue parsing as basic or digest may 777202613Sdes * follow, and the syntax is the same for 778202613Sdes * all. We'll just ignore this one when 779202613Sdes * looking at the list 780202613Sdes */ 781202613Sdes } 782221821Sdes 783202613Sdes /* Loop on attributes */ 784202613Sdes for (;;) { 785202613Sdes /* Key */ 786202613Sdes lex = http_header_lex(&cp, key); 787202613Sdes if (lex != HTTPHL_WORD) 788202613Sdes goto out; 789202613Sdes 790202613Sdes /* Equal sign */ 791202613Sdes lex = http_header_lex(&cp, buf); 792202613Sdes if (lex != '=') 793202613Sdes goto out; 794202613Sdes 795202613Sdes /* Value */ 796202613Sdes lex = http_header_lex(&cp, value); 797202613Sdes if (lex != HTTPHL_WORD && lex != HTTPHL_STRING) 798202613Sdes goto out; 799202613Sdes 800202613Sdes if (!strcasecmp(key, "realm")) 801221821Sdes cs->challenges[cs->count]->realm = 802202613Sdes strdup(value); 803202613Sdes else if (!strcasecmp(key, "qop")) 804221821Sdes cs->challenges[cs->count]->qop = 805202613Sdes strdup(value); 806202613Sdes else if (!strcasecmp(key, "nonce")) 807221821Sdes cs->challenges[cs->count]->nonce = 808202613Sdes strdup(value); 809202613Sdes else if (!strcasecmp(key, "opaque")) 810221821Sdes cs->challenges[cs->count]->opaque = 811202613Sdes strdup(value); 812202613Sdes else if (!strcasecmp(key, "algorithm")) 813221821Sdes cs->challenges[cs->count]->algo = 814202613Sdes strdup(value); 815202613Sdes else if (!strcasecmp(key, "stale")) 816221821Sdes cs->challenges[cs->count]->stale = 817202613Sdes strcasecmp(value, "no"); 818202613Sdes /* Else ignore unknown attributes */ 819202613Sdes 820202613Sdes /* Comma or Next challenge or End */ 821202613Sdes lex = http_header_lex(&cp, key); 822221821Sdes /* 823221821Sdes * If we get a word here, this is the beginning of the 824221821Sdes * next challenge. Break the attributes loop 825221821Sdes */ 826202613Sdes if (lex == HTTPHL_WORD) 827202613Sdes break; 828202613Sdes 829202613Sdes if (lex == HTTPHL_END) { 830202613Sdes /* End while looking for ',' is normal exit */ 831202613Sdes cs->count++; 832202613Sdes ret = 0; 833202613Sdes goto out; 834202613Sdes } 835202613Sdes /* Anything else is an error */ 836202613Sdes if (lex != ',') 837202613Sdes goto out; 838202613Sdes 839202613Sdes } /* End attributes loop */ 840202613Sdes } /* End challenge loop */ 841202613Sdes 842221821Sdes /* 843221821Sdes * Challenges max count exceeded. This really can't happen 844221821Sdes * with normal data, something's fishy -> error 845221821Sdes */ 846202613Sdes 847202613Sdesout: 848202613Sdes if (key) 849202613Sdes free(key); 850202613Sdes if (value) 851202613Sdes free(value); 852202613Sdes if (buf) 853202613Sdes free(buf); 854202613Sdes return (ret); 855202613Sdes} 856202613Sdes 857202613Sdes 85863012Sdes/* 85963012Sdes * Parse a last-modified header 86063012Sdes */ 86163716Sdesstatic int 862174588Sdeshttp_parse_mtime(const char *p, time_t *mtime) 86363012Sdes{ 86490267Sdes char locale[64], *r; 86590267Sdes struct tm tm; 86663012Sdes 867109967Sdes strncpy(locale, setlocale(LC_TIME, NULL), sizeof(locale)); 86890267Sdes setlocale(LC_TIME, "C"); 86990267Sdes r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm); 87090267Sdes /* XXX should add support for date-2 and date-3 */ 87190267Sdes setlocale(LC_TIME, locale); 87290267Sdes if (r == NULL) 87390267Sdes return (-1); 87490267Sdes DEBUG(fprintf(stderr, "last modified: [%04d-%02d-%02d " 87588769Sdes "%02d:%02d:%02d]\n", 87663012Sdes tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 87763012Sdes tm.tm_hour, tm.tm_min, tm.tm_sec)); 87890267Sdes *mtime = timegm(&tm); 87990267Sdes return (0); 88063012Sdes} 88163012Sdes 88263012Sdes/* 88363012Sdes * Parse a content-length header 88463012Sdes */ 88563716Sdesstatic int 886174588Sdeshttp_parse_length(const char *p, off_t *length) 88763012Sdes{ 88890267Sdes off_t len; 88990267Sdes 890174761Sdes for (len = 0; *p && isdigit((unsigned char)*p); ++p) 89190267Sdes len = len * 10 + (*p - '0'); 89290267Sdes if (*p) 89390267Sdes return (-1); 89490267Sdes DEBUG(fprintf(stderr, "content length: [%lld]\n", 89590267Sdes (long long)len)); 89690267Sdes *length = len; 89790267Sdes return (0); 89863012Sdes} 89963012Sdes 90063012Sdes/* 90163012Sdes * Parse a content-range header 90263012Sdes */ 90363716Sdesstatic int 904174588Sdeshttp_parse_range(const char *p, off_t *offset, off_t *length, off_t *size) 90563012Sdes{ 90690267Sdes off_t first, last, len; 90763716Sdes 90890267Sdes if (strncasecmp(p, "bytes ", 6) != 0) 90990267Sdes return (-1); 910125696Sdes p += 6; 911125696Sdes if (*p == '*') { 912125696Sdes first = last = -1; 913125696Sdes ++p; 914125696Sdes } else { 915174761Sdes for (first = 0; *p && isdigit((unsigned char)*p); ++p) 916125696Sdes first = first * 10 + *p - '0'; 917125696Sdes if (*p != '-') 918125696Sdes return (-1); 919174761Sdes for (last = 0, ++p; *p && isdigit((unsigned char)*p); ++p) 920125696Sdes last = last * 10 + *p - '0'; 921125696Sdes } 92290267Sdes if (first > last || *p != '/') 92390267Sdes return (-1); 924174761Sdes for (len = 0, ++p; *p && isdigit((unsigned char)*p); ++p) 92590267Sdes len = len * 10 + *p - '0'; 92690267Sdes if (*p || len < last - first + 1) 92790267Sdes return (-1); 928125696Sdes if (first == -1) { 929125696Sdes DEBUG(fprintf(stderr, "content range: [*/%lld]\n", 930125696Sdes (long long)len)); 931125696Sdes *length = 0; 932125696Sdes } else { 933125696Sdes DEBUG(fprintf(stderr, "content range: [%lld-%lld/%lld]\n", 934125696Sdes (long long)first, (long long)last, (long long)len)); 935125696Sdes *length = last - first + 1; 936125696Sdes } 93790267Sdes *offset = first; 93890267Sdes *size = len; 93990267Sdes return (0); 94063012Sdes} 94163012Sdes 94290267Sdes 94363012Sdes/***************************************************************************** 94463012Sdes * Helper functions for authorization 94563012Sdes */ 94663012Sdes 94763012Sdes/* 94837608Sdes * Base64 encoding 94937608Sdes */ 95062965Sdesstatic char * 951174588Sdeshttp_base64(const char *src) 95237608Sdes{ 95390267Sdes static const char base64[] = 95490267Sdes "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 95590267Sdes "abcdefghijklmnopqrstuvwxyz" 95690267Sdes "0123456789+/"; 95790267Sdes char *str, *dst; 95890267Sdes size_t l; 95990267Sdes int t, r; 96062965Sdes 96190267Sdes l = strlen(src); 962133280Sdes if ((str = malloc(((l + 2) / 3) * 4 + 1)) == NULL) 96390267Sdes return (NULL); 96490267Sdes dst = str; 96590267Sdes r = 0; 96637608Sdes 96790267Sdes while (l >= 3) { 96890267Sdes t = (src[0] << 16) | (src[1] << 8) | src[2]; 96990267Sdes dst[0] = base64[(t >> 18) & 0x3f]; 97090267Sdes dst[1] = base64[(t >> 12) & 0x3f]; 97190267Sdes dst[2] = base64[(t >> 6) & 0x3f]; 97290267Sdes dst[3] = base64[(t >> 0) & 0x3f]; 97390267Sdes src += 3; l -= 3; 97490267Sdes dst += 4; r += 4; 97590267Sdes } 97637608Sdes 97790267Sdes switch (l) { 97890267Sdes case 2: 97990267Sdes t = (src[0] << 16) | (src[1] << 8); 98090267Sdes dst[0] = base64[(t >> 18) & 0x3f]; 98190267Sdes dst[1] = base64[(t >> 12) & 0x3f]; 98290267Sdes dst[2] = base64[(t >> 6) & 0x3f]; 98390267Sdes dst[3] = '='; 98490267Sdes dst += 4; 98590267Sdes r += 4; 98690267Sdes break; 98790267Sdes case 1: 98890267Sdes t = src[0] << 16; 98990267Sdes dst[0] = base64[(t >> 18) & 0x3f]; 99090267Sdes dst[1] = base64[(t >> 12) & 0x3f]; 99190267Sdes dst[2] = dst[3] = '='; 99290267Sdes dst += 4; 99390267Sdes r += 4; 99490267Sdes break; 99590267Sdes case 0: 99690267Sdes break; 99790267Sdes } 99890267Sdes 99990267Sdes *dst = 0; 100090267Sdes return (str); 100137608Sdes} 100237608Sdes 1003202613Sdes 100437608Sdes/* 1005202613Sdes * Extract authorization parameters from environment value. 1006202613Sdes * The value is like scheme:realm:user:pass 1007202613Sdes */ 1008202613Sdestypedef struct { 1009202613Sdes char *scheme; 1010202613Sdes char *realm; 1011202613Sdes char *user; 1012202613Sdes char *password; 1013202613Sdes} http_auth_params_t; 1014202613Sdes 1015202613Sdesstatic void 1016202613Sdesinit_http_auth_params(http_auth_params_t *s) 1017202613Sdes{ 1018202613Sdes s->scheme = s->realm = s->user = s->password = 0; 1019202613Sdes} 1020202613Sdes 1021221821Sdesstatic void 1022202613Sdesclean_http_auth_params(http_auth_params_t *s) 1023202613Sdes{ 1024221821Sdes if (s->scheme) 1025202613Sdes free(s->scheme); 1026221821Sdes if (s->realm) 1027202613Sdes free(s->realm); 1028221821Sdes if (s->user) 1029202613Sdes free(s->user); 1030221821Sdes if (s->password) 1031202613Sdes free(s->password); 1032202613Sdes init_http_auth_params(s); 1033202613Sdes} 1034202613Sdes 1035202613Sdesstatic int 1036202613Sdeshttp_authfromenv(const char *p, http_auth_params_t *parms) 1037202613Sdes{ 1038202613Sdes int ret = -1; 1039202613Sdes char *v, *ve; 1040202613Sdes char *str = strdup(p); 1041202613Sdes 1042202613Sdes if (str == NULL) { 1043202613Sdes fetch_syserr(); 1044202613Sdes return (-1); 1045202613Sdes } 1046202613Sdes v = str; 1047202613Sdes 1048202613Sdes if ((ve = strchr(v, ':')) == NULL) 1049202613Sdes goto out; 1050202613Sdes 1051202613Sdes *ve = 0; 1052202613Sdes if ((parms->scheme = strdup(v)) == NULL) { 1053202613Sdes fetch_syserr(); 1054202613Sdes goto out; 1055202613Sdes } 1056202613Sdes v = ve + 1; 1057202613Sdes 1058202613Sdes if ((ve = strchr(v, ':')) == NULL) 1059202613Sdes goto out; 1060202613Sdes 1061202613Sdes *ve = 0; 1062202613Sdes if ((parms->realm = strdup(v)) == NULL) { 1063202613Sdes fetch_syserr(); 1064202613Sdes goto out; 1065202613Sdes } 1066202613Sdes v = ve + 1; 1067202613Sdes 1068202613Sdes if ((ve = strchr(v, ':')) == NULL) 1069202613Sdes goto out; 1070202613Sdes 1071202613Sdes *ve = 0; 1072202613Sdes if ((parms->user = strdup(v)) == NULL) { 1073202613Sdes fetch_syserr(); 1074202613Sdes goto out; 1075202613Sdes } 1076202613Sdes v = ve + 1; 1077202613Sdes 1078202613Sdes 1079202613Sdes if ((parms->password = strdup(v)) == NULL) { 1080202613Sdes fetch_syserr(); 1081202613Sdes goto out; 1082202613Sdes } 1083202613Sdes ret = 0; 1084202613Sdesout: 1085221821Sdes if (ret == -1) 1086202613Sdes clean_http_auth_params(parms); 1087202613Sdes if (str) 1088202613Sdes free(str); 1089202613Sdes return (ret); 1090202613Sdes} 1091202613Sdes 1092202613Sdes 1093221821Sdes/* 1094202613Sdes * Digest response: the code to compute the digest is taken from the 1095221821Sdes * sample implementation in RFC2616 1096202613Sdes */ 1097221822Sdes#define IN const 1098202613Sdes#define OUT 1099202613Sdes 1100202613Sdes#define HASHLEN 16 1101202613Sdestypedef char HASH[HASHLEN]; 1102202613Sdes#define HASHHEXLEN 32 1103202613Sdestypedef char HASHHEX[HASHHEXLEN+1]; 1104202613Sdes 1105202613Sdesstatic const char *hexchars = "0123456789abcdef"; 1106221821Sdesstatic void 1107202613SdesCvtHex(IN HASH Bin, OUT HASHHEX Hex) 1108202613Sdes{ 1109202613Sdes unsigned short i; 1110202613Sdes unsigned char j; 1111202613Sdes 1112202613Sdes for (i = 0; i < HASHLEN; i++) { 1113202613Sdes j = (Bin[i] >> 4) & 0xf; 1114202613Sdes Hex[i*2] = hexchars[j]; 1115202613Sdes j = Bin[i] & 0xf; 1116202613Sdes Hex[i*2+1] = hexchars[j]; 1117202613Sdes }; 1118202613Sdes Hex[HASHHEXLEN] = '\0'; 1119202613Sdes}; 1120202613Sdes 1121202613Sdes/* calculate H(A1) as per spec */ 1122221821Sdesstatic void 1123202613SdesDigestCalcHA1( 1124202613Sdes IN char * pszAlg, 1125202613Sdes IN char * pszUserName, 1126202613Sdes IN char * pszRealm, 1127202613Sdes IN char * pszPassword, 1128202613Sdes IN char * pszNonce, 1129202613Sdes IN char * pszCNonce, 1130202613Sdes OUT HASHHEX SessionKey 1131202613Sdes ) 1132202613Sdes{ 1133202613Sdes MD5_CTX Md5Ctx; 1134202613Sdes HASH HA1; 1135202613Sdes 1136202613Sdes MD5Init(&Md5Ctx); 1137202613Sdes MD5Update(&Md5Ctx, pszUserName, strlen(pszUserName)); 1138202613Sdes MD5Update(&Md5Ctx, ":", 1); 1139202613Sdes MD5Update(&Md5Ctx, pszRealm, strlen(pszRealm)); 1140202613Sdes MD5Update(&Md5Ctx, ":", 1); 1141202613Sdes MD5Update(&Md5Ctx, pszPassword, strlen(pszPassword)); 1142202613Sdes MD5Final(HA1, &Md5Ctx); 1143202613Sdes if (strcasecmp(pszAlg, "md5-sess") == 0) { 1144202613Sdes 1145202613Sdes MD5Init(&Md5Ctx); 1146202613Sdes MD5Update(&Md5Ctx, HA1, HASHLEN); 1147202613Sdes MD5Update(&Md5Ctx, ":", 1); 1148202613Sdes MD5Update(&Md5Ctx, pszNonce, strlen(pszNonce)); 1149202613Sdes MD5Update(&Md5Ctx, ":", 1); 1150202613Sdes MD5Update(&Md5Ctx, pszCNonce, strlen(pszCNonce)); 1151202613Sdes MD5Final(HA1, &Md5Ctx); 1152202613Sdes }; 1153202613Sdes CvtHex(HA1, SessionKey); 1154202613Sdes} 1155202613Sdes 1156202613Sdes/* calculate request-digest/response-digest as per HTTP Digest spec */ 1157221821Sdesstatic void 1158202613SdesDigestCalcResponse( 1159202613Sdes IN HASHHEX HA1, /* H(A1) */ 1160202613Sdes IN char * pszNonce, /* nonce from server */ 1161202613Sdes IN char * pszNonceCount, /* 8 hex digits */ 1162202613Sdes IN char * pszCNonce, /* client nonce */ 1163202613Sdes IN char * pszQop, /* qop-value: "", "auth", "auth-int" */ 1164202613Sdes IN char * pszMethod, /* method from the request */ 1165202613Sdes IN char * pszDigestUri, /* requested URL */ 1166202613Sdes IN HASHHEX HEntity, /* H(entity body) if qop="auth-int" */ 1167202613Sdes OUT HASHHEX Response /* request-digest or response-digest */ 1168202613Sdes ) 1169202613Sdes{ 1170221821Sdes/* DEBUG(fprintf(stderr, 1171202613Sdes "Calc: HA1[%s] Nonce[%s] qop[%s] method[%s] URI[%s]\n", 1172202613Sdes HA1, pszNonce, pszQop, pszMethod, pszDigestUri));*/ 1173202613Sdes MD5_CTX Md5Ctx; 1174202613Sdes HASH HA2; 1175202613Sdes HASH RespHash; 1176202613Sdes HASHHEX HA2Hex; 1177202613Sdes 1178202613Sdes // calculate H(A2) 1179202613Sdes MD5Init(&Md5Ctx); 1180202613Sdes MD5Update(&Md5Ctx, pszMethod, strlen(pszMethod)); 1181202613Sdes MD5Update(&Md5Ctx, ":", 1); 1182202613Sdes MD5Update(&Md5Ctx, pszDigestUri, strlen(pszDigestUri)); 1183202613Sdes if (strcasecmp(pszQop, "auth-int") == 0) { 1184202613Sdes MD5Update(&Md5Ctx, ":", 1); 1185202613Sdes MD5Update(&Md5Ctx, HEntity, HASHHEXLEN); 1186202613Sdes }; 1187202613Sdes MD5Final(HA2, &Md5Ctx); 1188202613Sdes CvtHex(HA2, HA2Hex); 1189202613Sdes 1190202613Sdes // calculate response 1191202613Sdes MD5Init(&Md5Ctx); 1192202613Sdes MD5Update(&Md5Ctx, HA1, HASHHEXLEN); 1193202613Sdes MD5Update(&Md5Ctx, ":", 1); 1194202613Sdes MD5Update(&Md5Ctx, pszNonce, strlen(pszNonce)); 1195202613Sdes MD5Update(&Md5Ctx, ":", 1); 1196202613Sdes if (*pszQop) { 1197202613Sdes MD5Update(&Md5Ctx, pszNonceCount, strlen(pszNonceCount)); 1198202613Sdes MD5Update(&Md5Ctx, ":", 1); 1199202613Sdes MD5Update(&Md5Ctx, pszCNonce, strlen(pszCNonce)); 1200202613Sdes MD5Update(&Md5Ctx, ":", 1); 1201202613Sdes MD5Update(&Md5Ctx, pszQop, strlen(pszQop)); 1202202613Sdes MD5Update(&Md5Ctx, ":", 1); 1203202613Sdes }; 1204202613Sdes MD5Update(&Md5Ctx, HA2Hex, HASHHEXLEN); 1205202613Sdes MD5Final(RespHash, &Md5Ctx); 1206202613Sdes CvtHex(RespHash, Response); 1207202613Sdes} 1208202613Sdes 1209221821Sdes/* 1210221821Sdes * Generate/Send a Digest authorization header 1211202613Sdes * This looks like: [Proxy-]Authorization: credentials 1212202613Sdes * 1213202613Sdes * credentials = "Digest" digest-response 1214202613Sdes * digest-response = 1#( username | realm | nonce | digest-uri 1215202613Sdes * | response | [ algorithm ] | [cnonce] | 1216202613Sdes * [opaque] | [message-qop] | 1217202613Sdes * [nonce-count] | [auth-param] ) 1218202613Sdes * username = "username" "=" username-value 1219202613Sdes * username-value = quoted-string 1220202613Sdes * digest-uri = "uri" "=" digest-uri-value 1221202613Sdes * digest-uri-value = request-uri ; As specified by HTTP/1.1 1222202613Sdes * message-qop = "qop" "=" qop-value 1223202613Sdes * cnonce = "cnonce" "=" cnonce-value 1224202613Sdes * cnonce-value = nonce-value 1225202613Sdes * nonce-count = "nc" "=" nc-value 1226202613Sdes * nc-value = 8LHEX 1227202613Sdes * response = "response" "=" request-digest 1228202613Sdes * request-digest = <"> 32LHEX <"> 1229202613Sdes */ 1230202613Sdesstatic int 1231202613Sdeshttp_digest_auth(conn_t *conn, const char *hdr, http_auth_challenge_t *c, 1232202613Sdes http_auth_params_t *parms, struct url *url) 1233202613Sdes{ 1234202613Sdes int r; 1235202613Sdes char noncecount[10]; 1236202613Sdes char cnonce[40]; 1237202613Sdes char *options = 0; 1238202613Sdes 1239202613Sdes if (!c->realm || !c->nonce) { 1240202613Sdes DEBUG(fprintf(stderr, "realm/nonce not set in challenge\n")); 1241202613Sdes return(-1); 1242202613Sdes } 1243221821Sdes if (!c->algo) 1244202613Sdes c->algo = strdup(""); 1245202613Sdes 1246221821Sdes if (asprintf(&options, "%s%s%s%s", 1247202613Sdes *c->algo? ",algorithm=" : "", c->algo, 1248202613Sdes c->opaque? ",opaque=" : "", c->opaque?c->opaque:"")== -1) 1249202613Sdes return (-1); 1250202613Sdes 1251202613Sdes if (!c->qop) { 1252202613Sdes c->qop = strdup(""); 1253202613Sdes *noncecount = 0; 1254202613Sdes *cnonce = 0; 1255202613Sdes } else { 1256202613Sdes c->nc++; 1257202613Sdes sprintf(noncecount, "%08x", c->nc); 1258202613Sdes /* We don't try very hard with the cnonce ... */ 1259202613Sdes sprintf(cnonce, "%x%lx", getpid(), (unsigned long)time(0)); 1260202613Sdes } 1261202613Sdes 1262202613Sdes HASHHEX HA1; 1263202613Sdes DigestCalcHA1(c->algo, parms->user, c->realm, 1264202613Sdes parms->password, c->nonce, cnonce, HA1); 1265202613Sdes DEBUG(fprintf(stderr, "HA1: [%s]\n", HA1)); 1266202613Sdes HASHHEX digest; 1267202613Sdes DigestCalcResponse(HA1, c->nonce, noncecount, cnonce, c->qop, 1268202613Sdes "GET", url->doc, "", digest); 1269202613Sdes 1270202613Sdes if (c->qop[0]) { 1271202613Sdes r = http_cmd(conn, "%s: Digest username=\"%s\",realm=\"%s\"," 1272202613Sdes "nonce=\"%s\",uri=\"%s\",response=\"%s\"," 1273202613Sdes "qop=\"auth\", cnonce=\"%s\", nc=%s%s", 1274221821Sdes hdr, parms->user, c->realm, 1275202613Sdes c->nonce, url->doc, digest, 1276202613Sdes cnonce, noncecount, options); 1277202613Sdes } else { 1278202613Sdes r = http_cmd(conn, "%s: Digest username=\"%s\",realm=\"%s\"," 1279202613Sdes "nonce=\"%s\",uri=\"%s\",response=\"%s\"%s", 1280221821Sdes hdr, parms->user, c->realm, 1281202613Sdes c->nonce, url->doc, digest, options); 1282202613Sdes } 1283202613Sdes if (options) 1284202613Sdes free(options); 1285202613Sdes return (r); 1286202613Sdes} 1287202613Sdes 1288202613Sdes/* 128937608Sdes * Encode username and password 129037608Sdes */ 129162965Sdesstatic int 1292174588Sdeshttp_basic_auth(conn_t *conn, const char *hdr, const char *usr, const char *pwd) 129337608Sdes{ 129490267Sdes char *upw, *auth; 129590267Sdes int r; 129637608Sdes 1297202613Sdes DEBUG(fprintf(stderr, "basic: usr: [%s]\n", usr)); 1298202613Sdes DEBUG(fprintf(stderr, "basic: pwd: [%s]\n", pwd)); 129990267Sdes if (asprintf(&upw, "%s:%s", usr, pwd) == -1) 130090267Sdes return (-1); 1301174588Sdes auth = http_base64(upw); 130290267Sdes free(upw); 130390267Sdes if (auth == NULL) 130490267Sdes return (-1); 1305174588Sdes r = http_cmd(conn, "%s: Basic %s", hdr, auth); 130690267Sdes free(auth); 130790267Sdes return (r); 130862965Sdes} 130962965Sdes 131062965Sdes/* 1311221821Sdes * Chose the challenge to answer and call the appropriate routine to 1312202613Sdes * produce the header. 131362965Sdes */ 131462965Sdesstatic int 1315202613Sdeshttp_authorize(conn_t *conn, const char *hdr, http_auth_challenges_t *cs, 1316202613Sdes http_auth_params_t *parms, struct url *url) 131762965Sdes{ 1318202613Sdes http_auth_challenge_t *basic = NULL; 1319202613Sdes http_auth_challenge_t *digest = NULL; 1320202613Sdes int i; 132162965Sdes 1322202613Sdes /* If user or pass are null we're not happy */ 1323202613Sdes if (!parms->user || !parms->password) { 1324202613Sdes DEBUG(fprintf(stderr, "NULL usr or pass\n")); 1325202613Sdes return (-1); 132690267Sdes } 1327202613Sdes 1328202613Sdes /* Look for a Digest and a Basic challenge */ 1329202613Sdes for (i = 0; i < cs->count; i++) { 1330202613Sdes if (cs->challenges[i]->scheme == HTTPAS_BASIC) 1331202613Sdes basic = cs->challenges[i]; 1332202613Sdes if (cs->challenges[i]->scheme == HTTPAS_DIGEST) 1333202613Sdes digest = cs->challenges[i]; 1334202613Sdes } 1335202613Sdes 1336202613Sdes /* Error if "Digest" was specified and there is no Digest challenge */ 1337221821Sdes if (!digest && (parms->scheme && 1338202613Sdes !strcasecmp(parms->scheme, "digest"))) { 1339221821Sdes DEBUG(fprintf(stderr, 1340202613Sdes "Digest auth in env, not supported by peer\n")); 1341202613Sdes return (-1); 1342202613Sdes } 1343221821Sdes /* 1344221821Sdes * If "basic" was specified in the environment, or there is no Digest 1345202613Sdes * challenge, do the basic thing. Don't need a challenge for this, 1346221821Sdes * so no need to check basic!=NULL 1347202613Sdes */ 1348202613Sdes if (!digest || (parms->scheme && !strcasecmp(parms->scheme,"basic"))) 1349202613Sdes return (http_basic_auth(conn,hdr,parms->user,parms->password)); 1350202613Sdes 1351202613Sdes /* Else, prefer digest. We just checked that it's not NULL */ 1352202613Sdes return (http_digest_auth(conn, hdr, digest, parms, url)); 135337608Sdes} 135437608Sdes 135563012Sdes/***************************************************************************** 135663012Sdes * Helper functions for connecting to a server or proxy 135763012Sdes */ 135863012Sdes 135937608Sdes/* 136090267Sdes * Connect to the correct HTTP server or proxy. 136163012Sdes */ 136297856Sdesstatic conn_t * 1363174588Sdeshttp_connect(struct url *URL, struct url *purl, const char *flags) 136463012Sdes{ 136597856Sdes conn_t *conn; 136690267Sdes int verbose; 1367141958Skbyanc int af, val; 136890267Sdes 136963012Sdes#ifdef INET6 137090267Sdes af = AF_UNSPEC; 137160737Sume#else 137290267Sdes af = AF_INET; 137360737Sume#endif 137490267Sdes 137590267Sdes verbose = CHECK_FLAG('v'); 137690267Sdes if (CHECK_FLAG('4')) 137790267Sdes af = AF_INET; 137867043Sdes#ifdef INET6 137990267Sdes else if (CHECK_FLAG('6')) 138090267Sdes af = AF_INET6; 138167043Sdes#endif 138267043Sdes 138397868Sdes if (purl && strcasecmp(URL->scheme, SCHEME_HTTPS) != 0) { 138490267Sdes URL = purl; 138590267Sdes } else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) { 138690267Sdes /* can't talk http to an ftp server */ 138790267Sdes /* XXX should set an error code */ 138897856Sdes return (NULL); 138990267Sdes } 139090267Sdes 1391174588Sdes if ((conn = fetch_connect(URL->host, URL->port, af, verbose)) == NULL) 1392174588Sdes /* fetch_connect() has already set an error code */ 139397856Sdes return (NULL); 139497868Sdes if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 && 1395174588Sdes fetch_ssl(conn, verbose) == -1) { 1396174588Sdes fetch_close(conn); 139797891Sdes /* grrr */ 139897891Sdes errno = EAUTH; 1399174588Sdes fetch_syserr(); 140097868Sdes return (NULL); 140197868Sdes } 1402141958Skbyanc 1403141958Skbyanc val = 1; 1404141958Skbyanc setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, sizeof(val)); 1405141958Skbyanc 140697856Sdes return (conn); 140767043Sdes} 140867043Sdes 140967043Sdesstatic struct url * 1410174752Sdeshttp_get_proxy(struct url * url, const char *flags) 141167043Sdes{ 141290267Sdes struct url *purl; 141390267Sdes char *p; 141490267Sdes 1415112797Sdes if (flags != NULL && strchr(flags, 'd') != NULL) 1416112081Sdes return (NULL); 1417174752Sdes if (fetch_no_proxy_match(url->host)) 1418174752Sdes return (NULL); 141990267Sdes if (((p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 1420149414Sdes *p && (purl = fetchParseURL(p))) { 142190267Sdes if (!*purl->scheme) 142290267Sdes strcpy(purl->scheme, SCHEME_HTTP); 142390267Sdes if (!purl->port) 1424174588Sdes purl->port = fetch_default_proxy_port(purl->scheme); 142590267Sdes if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 142690267Sdes return (purl); 142790267Sdes fetchFreeURL(purl); 142890267Sdes } 142990267Sdes return (NULL); 143060376Sdes} 143160376Sdes 143288771Sdesstatic void 1433174588Sdeshttp_print_html(FILE *out, FILE *in) 143488771Sdes{ 143590267Sdes size_t len; 143690267Sdes char *line, *p, *q; 143790267Sdes int comment, tag; 143888771Sdes 143990267Sdes comment = tag = 0; 144090267Sdes while ((line = fgetln(in, &len)) != NULL) { 1441174761Sdes while (len && isspace((unsigned char)line[len - 1])) 144290267Sdes --len; 144390267Sdes for (p = q = line; q < line + len; ++q) { 144490267Sdes if (comment && *q == '-') { 144590267Sdes if (q + 2 < line + len && 144690267Sdes strcmp(q, "-->") == 0) { 144790267Sdes tag = comment = 0; 144890267Sdes q += 2; 144990267Sdes } 145090267Sdes } else if (tag && !comment && *q == '>') { 145190267Sdes p = q + 1; 145290267Sdes tag = 0; 145390267Sdes } else if (!tag && *q == '<') { 145490267Sdes if (q > p) 145590267Sdes fwrite(p, q - p, 1, out); 145690267Sdes tag = 1; 145790267Sdes if (q + 3 < line + len && 145890267Sdes strcmp(q, "<!--") == 0) { 145990267Sdes comment = 1; 146090267Sdes q += 3; 146190267Sdes } 146290267Sdes } 146388771Sdes } 146490267Sdes if (!tag && q > p) 146590267Sdes fwrite(p, q - p, 1, out); 146690267Sdes fputc('\n', out); 146788771Sdes } 146888771Sdes} 146988771Sdes 147090267Sdes 147163012Sdes/***************************************************************************** 147263012Sdes * Core 147360954Sdes */ 147460954Sdes 147560954Sdes/* 147663012Sdes * Send a request and process the reply 147797866Sdes * 147897866Sdes * XXX This function is way too long, the do..while loop should be split 147997866Sdes * XXX off into a separate function. 148060376Sdes */ 148167043SdesFILE * 1482174588Sdeshttp_request(struct url *URL, const char *op, struct url_stat *us, 1483202613Sdes struct url *purl, const char *flags) 148460376Sdes{ 1485186124Smurray char timebuf[80]; 1486186124Smurray char hbuf[MAXHOSTNAMELEN + 7], *host; 148797856Sdes conn_t *conn; 148890267Sdes struct url *url, *new; 1489202613Sdes int chunked, direct, ims, noredirect, verbose; 1490143049Skbyanc int e, i, n, val; 149190267Sdes off_t offset, clength, length, size; 149290267Sdes time_t mtime; 149390267Sdes const char *p; 149490267Sdes FILE *f; 149590267Sdes hdr_t h; 1496186124Smurray struct tm *timestruct; 1497202613Sdes http_headerbuf_t headerbuf; 1498202613Sdes http_auth_challenges_t server_challenges; 1499202613Sdes http_auth_challenges_t proxy_challenges; 150063012Sdes 1501202613Sdes /* The following calls don't allocate anything */ 1502221821Sdes init_http_headerbuf(&headerbuf); 1503202613Sdes init_http_auth_challenges(&server_challenges); 1504202613Sdes init_http_auth_challenges(&proxy_challenges); 1505202613Sdes 150690267Sdes direct = CHECK_FLAG('d'); 150790267Sdes noredirect = CHECK_FLAG('A'); 150890267Sdes verbose = CHECK_FLAG('v'); 1509186124Smurray ims = CHECK_FLAG('i'); 151060737Sume 151190267Sdes if (direct && purl) { 151290267Sdes fetchFreeURL(purl); 151390267Sdes purl = NULL; 151490267Sdes } 151563716Sdes 151690267Sdes /* try the provided URL first */ 151790267Sdes url = URL; 151863012Sdes 151990267Sdes /* if the A flag is set, we only get one try */ 152090267Sdes n = noredirect ? 1 : MAX_REDIRECT; 152190267Sdes i = 0; 152263012Sdes 152398422Sdes e = HTTP_PROTOCOL_ERROR; 152490267Sdes do { 152590267Sdes new = NULL; 152690267Sdes chunked = 0; 152790267Sdes offset = 0; 152890267Sdes clength = -1; 152990267Sdes length = -1; 153090267Sdes size = -1; 153190267Sdes mtime = 0; 153290267Sdes 153390267Sdes /* check port */ 153490267Sdes if (!url->port) 1535174588Sdes url->port = fetch_default_port(url->scheme); 153690267Sdes 153790267Sdes /* were we redirected to an FTP URL? */ 153890267Sdes if (purl == NULL && strcmp(url->scheme, SCHEME_FTP) == 0) { 153990267Sdes if (strcmp(op, "GET") == 0) 1540174588Sdes return (ftp_request(url, "RETR", us, purl, flags)); 154190267Sdes else if (strcmp(op, "HEAD") == 0) 1542174588Sdes return (ftp_request(url, "STAT", us, purl, flags)); 154390267Sdes } 154490267Sdes 154590267Sdes /* connect to server or proxy */ 1546174588Sdes if ((conn = http_connect(url, purl, flags)) == NULL) 154790267Sdes goto ouch; 154890267Sdes 154990267Sdes host = url->host; 155060737Sume#ifdef INET6 155190267Sdes if (strchr(url->host, ':')) { 155290267Sdes snprintf(hbuf, sizeof(hbuf), "[%s]", url->host); 155390267Sdes host = hbuf; 155490267Sdes } 155560737Sume#endif 1556174588Sdes if (url->port != fetch_default_port(url->scheme)) { 1557107372Sdes if (host != hbuf) { 1558107372Sdes strcpy(hbuf, host); 1559107372Sdes host = hbuf; 1560107372Sdes } 1561107372Sdes snprintf(hbuf + strlen(hbuf), 1562107372Sdes sizeof(hbuf) - strlen(hbuf), ":%d", url->port); 1563107372Sdes } 156437535Sdes 156590267Sdes /* send request */ 156690267Sdes if (verbose) 1567174588Sdes fetch_info("requesting %s://%s%s", 1568107372Sdes url->scheme, host, url->doc); 156990267Sdes if (purl) { 1570174588Sdes http_cmd(conn, "%s %s://%s%s HTTP/1.1", 1571107372Sdes op, url->scheme, host, url->doc); 157290267Sdes } else { 1573174588Sdes http_cmd(conn, "%s %s HTTP/1.1", 157490267Sdes op, url->doc); 157590267Sdes } 157637535Sdes 1577186124Smurray if (ims && url->ims_time) { 1578186124Smurray timestruct = gmtime((time_t *)&url->ims_time); 1579186124Smurray (void)strftime(timebuf, 80, "%a, %d %b %Y %T GMT", 1580186124Smurray timestruct); 1581186124Smurray if (verbose) 1582186124Smurray fetch_info("If-Modified-Since: %s", timebuf); 1583186124Smurray http_cmd(conn, "If-Modified-Since: %s", timebuf); 1584186124Smurray } 158590267Sdes /* virtual host */ 1586174588Sdes http_cmd(conn, "Host: %s", host); 158790267Sdes 1588221821Sdes /* 1589221821Sdes * Proxy authorization: we only send auth after we received 1590221821Sdes * a 407 error. We do not first try basic anyway (changed 1591221821Sdes * when support was added for digest-auth) 1592221821Sdes */ 1593202613Sdes if (purl && proxy_challenges.valid) { 1594202613Sdes http_auth_params_t aparams; 1595202613Sdes init_http_auth_params(&aparams); 1596202613Sdes if (*purl->user || *purl->pwd) { 1597221821Sdes aparams.user = purl->user ? 1598202613Sdes strdup(purl->user) : strdup(""); 1599202613Sdes aparams.password = purl->pwd? 1600202613Sdes strdup(purl->pwd) : strdup(""); 1601221821Sdes } else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL && 1602202613Sdes *p != '\0') { 1603202613Sdes if (http_authfromenv(p, &aparams) < 0) { 1604202613Sdes http_seterr(HTTP_NEED_PROXY_AUTH); 1605202613Sdes goto ouch; 1606202613Sdes } 1607202613Sdes } 1608221821Sdes http_authorize(conn, "Proxy-Authorization", 1609202613Sdes &proxy_challenges, &aparams, url); 1610202613Sdes clean_http_auth_params(&aparams); 161190267Sdes } 161290267Sdes 1613221821Sdes /* 1614221821Sdes * Server authorization: we never send "a priori" 1615202613Sdes * Basic auth, which used to be done if user/pass were 1616202613Sdes * set in the url. This would be weird because we'd send the 1617221821Sdes * password in the clear even if Digest is finally to be 1618202613Sdes * used (it would have made more sense for the 1619221821Sdes * pre-digest version to do this when Basic was specified 1620221821Sdes * in the environment) 1621221821Sdes */ 1622202613Sdes if (server_challenges.valid) { 1623202613Sdes http_auth_params_t aparams; 1624202613Sdes init_http_auth_params(&aparams); 1625202613Sdes if (*url->user || *url->pwd) { 1626221821Sdes aparams.user = url->user ? 1627202613Sdes strdup(url->user) : strdup(""); 1628221821Sdes aparams.password = url->pwd ? 1629202613Sdes strdup(url->pwd) : strdup(""); 1630221821Sdes } else if ((p = getenv("HTTP_AUTH")) != NULL && 1631202613Sdes *p != '\0') { 1632202613Sdes if (http_authfromenv(p, &aparams) < 0) { 1633202613Sdes http_seterr(HTTP_NEED_AUTH); 1634202613Sdes goto ouch; 1635202613Sdes } 1636221821Sdes } else if (fetchAuthMethod && 1637202613Sdes fetchAuthMethod(url) == 0) { 1638221821Sdes aparams.user = url->user ? 1639202613Sdes strdup(url->user) : strdup(""); 1640221821Sdes aparams.password = url->pwd ? 1641202613Sdes strdup(url->pwd) : strdup(""); 164290267Sdes } else { 1643174588Sdes http_seterr(HTTP_NEED_AUTH); 164490267Sdes goto ouch; 164590267Sdes } 1646221821Sdes http_authorize(conn, "Authorization", 1647202613Sdes &server_challenges, &aparams, url); 1648202613Sdes clean_http_auth_params(&aparams); 164990267Sdes } 165090267Sdes 165190267Sdes /* other headers */ 1652107372Sdes if ((p = getenv("HTTP_REFERER")) != NULL && *p != '\0') { 1653107372Sdes if (strcasecmp(p, "auto") == 0) 1654174588Sdes http_cmd(conn, "Referer: %s://%s%s", 1655107372Sdes url->scheme, host, url->doc); 1656107372Sdes else 1657174588Sdes http_cmd(conn, "Referer: %s", p); 1658107372Sdes } 165990267Sdes if ((p = getenv("HTTP_USER_AGENT")) != NULL && *p != '\0') 1660174588Sdes http_cmd(conn, "User-Agent: %s", p); 166190267Sdes else 1662174588Sdes http_cmd(conn, "User-Agent: %s " _LIBFETCH_VER, getprogname()); 1663109693Sdes if (url->offset > 0) 1664174588Sdes http_cmd(conn, "Range: bytes=%lld-", (long long)url->offset); 1665174588Sdes http_cmd(conn, "Connection: close"); 1666174588Sdes http_cmd(conn, ""); 166790267Sdes 1668143049Skbyanc /* 1669143049Skbyanc * Force the queued request to be dispatched. Normally, one 1670143049Skbyanc * would do this with shutdown(2) but squid proxies can be 1671143049Skbyanc * configured to disallow such half-closed connections. To 1672143049Skbyanc * be compatible with such configurations, fiddle with socket 1673143049Skbyanc * options to force the pending data to be written. 1674143049Skbyanc */ 1675143049Skbyanc val = 0; 1676143049Skbyanc setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, 1677143049Skbyanc sizeof(val)); 1678143049Skbyanc val = 1; 1679143049Skbyanc setsockopt(conn->sd, IPPROTO_TCP, TCP_NODELAY, &val, 1680143049Skbyanc sizeof(val)); 1681143049Skbyanc 168290267Sdes /* get reply */ 1683174588Sdes switch (http_get_reply(conn)) { 168490267Sdes case HTTP_OK: 168590267Sdes case HTTP_PARTIAL: 1686186124Smurray case HTTP_NOT_MODIFIED: 168790267Sdes /* fine */ 168890267Sdes break; 168990267Sdes case HTTP_MOVED_PERM: 169090267Sdes case HTTP_MOVED_TEMP: 169190267Sdes case HTTP_SEE_OTHER: 169290267Sdes /* 1693125695Sdes * Not so fine, but we still have to read the 1694125695Sdes * headers to get the new location. 169590267Sdes */ 169690267Sdes break; 169790267Sdes case HTTP_NEED_AUTH: 1698202613Sdes if (server_challenges.valid) { 169990267Sdes /* 1700125695Sdes * We already sent out authorization code, 1701125695Sdes * so there's nothing more we can do. 170290267Sdes */ 1703174588Sdes http_seterr(conn->err); 170490267Sdes goto ouch; 170590267Sdes } 170690267Sdes /* try again, but send the password this time */ 170790267Sdes if (verbose) 1708174588Sdes fetch_info("server requires authorization"); 170990267Sdes break; 171090267Sdes case HTTP_NEED_PROXY_AUTH: 1711202613Sdes if (proxy_challenges.valid) { 1712202613Sdes /* 1713202613Sdes * We already sent our proxy 1714202613Sdes * authorization code, so there's 1715202613Sdes * nothing more we can do. */ 1716202613Sdes http_seterr(conn->err); 1717202613Sdes goto ouch; 1718202613Sdes } 1719202613Sdes /* try again, but send the password this time */ 1720202613Sdes if (verbose) 1721202613Sdes fetch_info("proxy requires authorization"); 1722202613Sdes break; 1723125696Sdes case HTTP_BAD_RANGE: 1724125696Sdes /* 1725125696Sdes * This can happen if we ask for 0 bytes because 1726125696Sdes * we already have the whole file. Consider this 1727125696Sdes * a success for now, and check sizes later. 1728125696Sdes */ 1729125696Sdes break; 173090267Sdes case HTTP_PROTOCOL_ERROR: 173190267Sdes /* fall through */ 173290267Sdes case -1: 1733174588Sdes fetch_syserr(); 173490267Sdes goto ouch; 173590267Sdes default: 1736174588Sdes http_seterr(conn->err); 173790267Sdes if (!verbose) 173890267Sdes goto ouch; 173990267Sdes /* fall through so we can get the full error message */ 174090267Sdes } 174190267Sdes 1742202613Sdes /* get headers. http_next_header expects one line readahead */ 1743202613Sdes if (fetch_getln(conn) == -1) { 1744202613Sdes fetch_syserr(); 1745202613Sdes goto ouch; 1746202613Sdes } 174790267Sdes do { 1748202613Sdes switch ((h = http_next_header(conn, &headerbuf, &p))) { 174990267Sdes case hdr_syserror: 1750174588Sdes fetch_syserr(); 175190267Sdes goto ouch; 175290267Sdes case hdr_error: 1753174588Sdes http_seterr(HTTP_PROTOCOL_ERROR); 175490267Sdes goto ouch; 175590267Sdes case hdr_content_length: 1756174588Sdes http_parse_length(p, &clength); 175790267Sdes break; 175890267Sdes case hdr_content_range: 1759174588Sdes http_parse_range(p, &offset, &length, &size); 176090267Sdes break; 176190267Sdes case hdr_last_modified: 1762174588Sdes http_parse_mtime(p, &mtime); 176390267Sdes break; 176490267Sdes case hdr_location: 176597856Sdes if (!HTTP_REDIRECT(conn->err)) 176690267Sdes break; 176790267Sdes if (new) 176890267Sdes free(new); 176990267Sdes if (verbose) 1770174588Sdes fetch_info("%d redirect to %s", conn->err, p); 177190267Sdes if (*p == '/') 177290267Sdes /* absolute path */ 177390267Sdes new = fetchMakeURL(url->scheme, url->host, url->port, p, 177490267Sdes url->user, url->pwd); 177590267Sdes else 177690267Sdes new = fetchParseURL(p); 177790267Sdes if (new == NULL) { 177890267Sdes /* XXX should set an error code */ 177990267Sdes DEBUG(fprintf(stderr, "failed to parse new URL\n")); 178090267Sdes goto ouch; 178190267Sdes } 178290267Sdes if (!*new->user && !*new->pwd) { 178390267Sdes strcpy(new->user, url->user); 178490267Sdes strcpy(new->pwd, url->pwd); 178590267Sdes } 178690267Sdes new->offset = url->offset; 178790267Sdes new->length = url->length; 178890267Sdes break; 178990267Sdes case hdr_transfer_encoding: 179090267Sdes /* XXX weak test*/ 179190267Sdes chunked = (strcasecmp(p, "chunked") == 0); 179290267Sdes break; 179390267Sdes case hdr_www_authenticate: 179497856Sdes if (conn->err != HTTP_NEED_AUTH) 179590267Sdes break; 1796210563Sdes if (http_parse_authenticate(p, &server_challenges) == 0) 1797209632Sdes ++n; 179890267Sdes break; 1799202613Sdes case hdr_proxy_authenticate: 1800202613Sdes if (conn->err != HTTP_NEED_PROXY_AUTH) 1801202613Sdes break; 1802210563Sdes if (http_parse_authenticate(p, &proxy_challenges) == 0) 1803209632Sdes ++n; 1804202613Sdes break; 180590267Sdes case hdr_end: 180690267Sdes /* fall through */ 180790267Sdes case hdr_unknown: 180890267Sdes /* ignore */ 180990267Sdes break; 181090267Sdes } 181190267Sdes } while (h > hdr_end); 181290267Sdes 181390267Sdes /* we need to provide authentication */ 1814221821Sdes if (conn->err == HTTP_NEED_AUTH || 1815202613Sdes conn->err == HTTP_NEED_PROXY_AUTH) { 181698422Sdes e = conn->err; 1817221821Sdes if ((conn->err == HTTP_NEED_AUTH && 1818221821Sdes !server_challenges.valid) || 1819221821Sdes (conn->err == HTTP_NEED_PROXY_AUTH && 1820202613Sdes !proxy_challenges.valid)) { 1821202613Sdes /* 401/7 but no www/proxy-authenticate ?? */ 1822202613Sdes DEBUG(fprintf(stderr, "401/7 and no auth header\n")); 1823202613Sdes goto ouch; 1824202613Sdes } 1825174588Sdes fetch_close(conn); 182697856Sdes conn = NULL; 182790267Sdes continue; 182890267Sdes } 182990267Sdes 1830125696Sdes /* requested range not satisfiable */ 1831125696Sdes if (conn->err == HTTP_BAD_RANGE) { 1832125696Sdes if (url->offset == size && url->length == 0) { 1833125696Sdes /* asked for 0 bytes; fake it */ 1834125696Sdes offset = url->offset; 1835184222Sru clength = -1; 1836125696Sdes conn->err = HTTP_OK; 1837125696Sdes break; 1838125696Sdes } else { 1839174588Sdes http_seterr(conn->err); 1840125696Sdes goto ouch; 1841125696Sdes } 1842125696Sdes } 1843125696Sdes 1844104404Sru /* we have a hit or an error */ 1845186124Smurray if (conn->err == HTTP_OK 1846186124Smurray || conn->err == HTTP_NOT_MODIFIED 1847186124Smurray || conn->err == HTTP_PARTIAL 1848186124Smurray || HTTP_ERROR(conn->err)) 1849104404Sru break; 1850104404Sru 185190267Sdes /* all other cases: we got a redirect */ 185298422Sdes e = conn->err; 1853202613Sdes clean_http_auth_challenges(&server_challenges); 1854174588Sdes fetch_close(conn); 185597856Sdes conn = NULL; 185690267Sdes if (!new) { 185790267Sdes DEBUG(fprintf(stderr, "redirect with no new location\n")); 185890267Sdes break; 185990267Sdes } 186090267Sdes if (url != URL) 186190267Sdes fetchFreeURL(url); 186290267Sdes url = new; 186390267Sdes } while (++i < n); 186490267Sdes 186590267Sdes /* we failed, or ran out of retries */ 186697856Sdes if (conn == NULL) { 1867174588Sdes http_seterr(e); 186863012Sdes goto ouch; 186963012Sdes } 187060376Sdes 187190267Sdes DEBUG(fprintf(stderr, "offset %lld, length %lld," 187290267Sdes " size %lld, clength %lld\n", 187390267Sdes (long long)offset, (long long)length, 187490267Sdes (long long)size, (long long)clength)); 187560376Sdes 1876186124Smurray if (conn->err == HTTP_NOT_MODIFIED) { 1877186124Smurray http_seterr(HTTP_NOT_MODIFIED); 1878186124Smurray return (NULL); 1879186124Smurray } 1880186124Smurray 188190267Sdes /* check for inconsistencies */ 188290267Sdes if (clength != -1 && length != -1 && clength != length) { 1883174588Sdes http_seterr(HTTP_PROTOCOL_ERROR); 188463012Sdes goto ouch; 188563012Sdes } 188690267Sdes if (clength == -1) 188790267Sdes clength = length; 188890267Sdes if (clength != -1) 188990267Sdes length = offset + clength; 189090267Sdes if (length != -1 && size != -1 && length != size) { 1891174588Sdes http_seterr(HTTP_PROTOCOL_ERROR); 189263012Sdes goto ouch; 189390267Sdes } 189490267Sdes if (size == -1) 189590267Sdes size = length; 189660376Sdes 189790267Sdes /* fill in stats */ 189890267Sdes if (us) { 189990267Sdes us->size = size; 190090267Sdes us->atime = us->mtime = mtime; 190190267Sdes } 190263069Sdes 190390267Sdes /* too far? */ 1904109693Sdes if (URL->offset > 0 && offset > URL->offset) { 1905174588Sdes http_seterr(HTTP_PROTOCOL_ERROR); 190690267Sdes goto ouch; 190777238Sdes } 190860376Sdes 190990267Sdes /* report back real offset and size */ 191090267Sdes URL->offset = offset; 191190267Sdes URL->length = clength; 191237535Sdes 191390267Sdes /* wrap it up in a FILE */ 1914174588Sdes if ((f = http_funopen(conn, chunked)) == NULL) { 1915174588Sdes fetch_syserr(); 191690267Sdes goto ouch; 191790267Sdes } 191863716Sdes 191990267Sdes if (url != URL) 192090267Sdes fetchFreeURL(url); 192190267Sdes if (purl) 192290267Sdes fetchFreeURL(purl); 192363567Sdes 192497856Sdes if (HTTP_ERROR(conn->err)) { 1925174588Sdes http_print_html(stderr, f); 192690267Sdes fclose(f); 192790267Sdes f = NULL; 192890267Sdes } 1929202613Sdes clean_http_headerbuf(&headerbuf); 1930202613Sdes clean_http_auth_challenges(&server_challenges); 1931202613Sdes clean_http_auth_challenges(&proxy_challenges); 193290267Sdes return (f); 193388771Sdes 193490267Sdesouch: 193590267Sdes if (url != URL) 193690267Sdes fetchFreeURL(url); 193790267Sdes if (purl) 193890267Sdes fetchFreeURL(purl); 193997856Sdes if (conn != NULL) 1940174588Sdes fetch_close(conn); 1941202613Sdes clean_http_headerbuf(&headerbuf); 1942202613Sdes clean_http_auth_challenges(&server_challenges); 1943202613Sdes clean_http_auth_challenges(&proxy_challenges); 194490267Sdes return (NULL); 194563012Sdes} 194660189Sdes 194790267Sdes 194863012Sdes/***************************************************************************** 194963012Sdes * Entry points 195063012Sdes */ 195163012Sdes 195263012Sdes/* 195363340Sdes * Retrieve and stat a file by HTTP 195463340Sdes */ 195563340SdesFILE * 195675891SarchiefetchXGetHTTP(struct url *URL, struct url_stat *us, const char *flags) 195763340Sdes{ 1958174752Sdes return (http_request(URL, "GET", us, http_get_proxy(URL, flags), flags)); 195963340Sdes} 196063340Sdes 196163340Sdes/* 196263012Sdes * Retrieve a file by HTTP 196363012Sdes */ 196463012SdesFILE * 196575891SarchiefetchGetHTTP(struct url *URL, const char *flags) 196663012Sdes{ 196790267Sdes return (fetchXGetHTTP(URL, NULL, flags)); 196837535Sdes} 196937535Sdes 197063340Sdes/* 197163340Sdes * Store a file by HTTP 197263340Sdes */ 197337535SdesFILE * 197485093SdesfetchPutHTTP(struct url *URL __unused, const char *flags __unused) 197537535Sdes{ 197690267Sdes warnx("fetchPutHTTP(): not implemented"); 197790267Sdes return (NULL); 197837535Sdes} 197940975Sdes 198040975Sdes/* 198140975Sdes * Get an HTTP document's metadata 198240975Sdes */ 198340975Sdesint 198475891SarchiefetchStatHTTP(struct url *URL, struct url_stat *us, const char *flags) 198540975Sdes{ 198690267Sdes FILE *f; 198790267Sdes 1988174752Sdes f = http_request(URL, "HEAD", us, http_get_proxy(URL, flags), flags); 1989112081Sdes if (f == NULL) 199090267Sdes return (-1); 199190267Sdes fclose(f); 199290267Sdes return (0); 199340975Sdes} 199441989Sdes 199541989Sdes/* 199641989Sdes * List a directory 199741989Sdes */ 199841989Sdesstruct url_ent * 199985093SdesfetchListHTTP(struct url *url __unused, const char *flags __unused) 200041989Sdes{ 200190267Sdes warnx("fetchListHTTP(): not implemented"); 200290267Sdes return (NULL); 200341989Sdes} 2004