http.c revision 256257
137535Sdes/*- 2256257Sglebius * Copyright (c) 2000-2013 Dag-Erling 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 256257 2013-10-10 09:42:41Z glebius $"); 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> 79242606Sdes 80242606Sdes#ifdef WITH_SSL 81242606Sdes#include <openssl/md5.h> 82242606Sdes#define MD5Init(c) MD5_Init(c) 83242606Sdes#define MD5Update(c, data, len) MD5_Update(c, data, len) 84242606Sdes#define MD5Final(md, c) MD5_Final(md, c) 85242606Sdes#else 86202613Sdes#include <md5.h> 87242606Sdes#endif 8837535Sdes 89141958Skbyanc#include <netinet/in.h> 90141958Skbyanc#include <netinet/tcp.h> 91141958Skbyanc 9237535Sdes#include "fetch.h" 9340939Sdes#include "common.h" 9441862Sdes#include "httperr.h" 9537535Sdes 9663012Sdes/* Maximum number of redirects to follow */ 97242032Seadler#define MAX_REDIRECT 20 9837535Sdes 9963012Sdes/* Symbolic names for reply codes we care about */ 10063012Sdes#define HTTP_OK 200 10163012Sdes#define HTTP_PARTIAL 206 10263012Sdes#define HTTP_MOVED_PERM 301 10363012Sdes#define HTTP_MOVED_TEMP 302 10463012Sdes#define HTTP_SEE_OTHER 303 105186124Smurray#define HTTP_NOT_MODIFIED 304 106242293Seadler#define HTTP_USE_PROXY 305 107169386Sdes#define HTTP_TEMP_REDIRECT 307 108242289Seadler#define HTTP_PERM_REDIRECT 308 10963012Sdes#define HTTP_NEED_AUTH 401 11087317Sdes#define HTTP_NEED_PROXY_AUTH 407 111125696Sdes#define HTTP_BAD_RANGE 416 11263012Sdes#define HTTP_PROTOCOL_ERROR 999 11360196Sdes 11463012Sdes#define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \ 11590267Sdes || (xyz) == HTTP_MOVED_TEMP \ 116169386Sdes || (xyz) == HTTP_TEMP_REDIRECT \ 117242293Seadler || (xyz) == HTTP_USE_PROXY \ 11890267Sdes || (xyz) == HTTP_SEE_OTHER) 11963012Sdes 12088771Sdes#define HTTP_ERROR(xyz) ((xyz) > 400 && (xyz) < 599) 12163012Sdes 12290267Sdes 12363012Sdes/***************************************************************************** 12463012Sdes * I/O functions for decoding chunked streams 12563012Sdes */ 12663012Sdes 12797859Sdesstruct httpio 12837535Sdes{ 12997858Sdes conn_t *conn; /* connection */ 13097866Sdes int chunked; /* chunked mode */ 13197858Sdes char *buf; /* chunk buffer */ 13297866Sdes size_t bufsize; /* size of chunk buffer */ 13397866Sdes ssize_t buflen; /* amount of data currently in buffer */ 13497866Sdes int bufpos; /* current read offset in buffer */ 13597858Sdes int eof; /* end-of-file flag */ 13697858Sdes int error; /* error flag */ 13797858Sdes size_t chunksize; /* remaining size of current chunk */ 13863281Sdes#ifndef NDEBUG 13990267Sdes size_t total; 14063012Sdes#endif 14137535Sdes}; 14237535Sdes 14337608Sdes/* 14463012Sdes * Get next chunk header 14537608Sdes */ 14637608Sdesstatic int 147174588Sdeshttp_new_chunk(struct httpio *io) 14837608Sdes{ 14990267Sdes char *p; 15090267Sdes 151174588Sdes if (fetch_getln(io->conn) == -1) 15290267Sdes return (-1); 15390267Sdes 154174761Sdes if (io->conn->buflen < 2 || !isxdigit((unsigned char)*io->conn->buf)) 15590267Sdes return (-1); 15690267Sdes 157174761Sdes for (p = io->conn->buf; *p && !isspace((unsigned char)*p); ++p) { 15890267Sdes if (*p == ';') 15990267Sdes break; 160174761Sdes if (!isxdigit((unsigned char)*p)) 16190267Sdes return (-1); 162174761Sdes if (isdigit((unsigned char)*p)) { 16397859Sdes io->chunksize = io->chunksize * 16 + 16490267Sdes *p - '0'; 16590267Sdes } else { 16697859Sdes io->chunksize = io->chunksize * 16 + 167176036Sdes 10 + tolower((unsigned char)*p) - 'a'; 16890267Sdes } 16990267Sdes } 17090267Sdes 17163281Sdes#ifndef NDEBUG 17290267Sdes if (fetchDebug) { 17397859Sdes io->total += io->chunksize; 17497859Sdes if (io->chunksize == 0) 175106207Sdes fprintf(stderr, "%s(): end of last chunk\n", __func__); 17690267Sdes else 177106207Sdes fprintf(stderr, "%s(): new chunk: %lu (%lu)\n", 178106207Sdes __func__, (unsigned long)io->chunksize, 179106207Sdes (unsigned long)io->total); 18090267Sdes } 18163012Sdes#endif 18290267Sdes 18397859Sdes return (io->chunksize); 18437608Sdes} 18537608Sdes 18637608Sdes/* 18797866Sdes * Grow the input buffer to at least len bytes 18897866Sdes */ 18997866Sdesstatic inline int 190174588Sdeshttp_growbuf(struct httpio *io, size_t len) 19197866Sdes{ 19297866Sdes char *tmp; 19397866Sdes 19497866Sdes if (io->bufsize >= len) 19597866Sdes return (0); 19697866Sdes 19797866Sdes if ((tmp = realloc(io->buf, len)) == NULL) 19897866Sdes return (-1); 19997866Sdes io->buf = tmp; 20097866Sdes io->bufsize = len; 201106044Sdes return (0); 20297866Sdes} 20397866Sdes 20497866Sdes/* 20537608Sdes * Fill the input buffer, do chunk decoding on the fly 20637608Sdes */ 20763012Sdesstatic int 208174588Sdeshttp_fillbuf(struct httpio *io, size_t len) 20937535Sdes{ 210231247Sbapt ssize_t nbytes; 211231247Sbapt 21297859Sdes if (io->error) 21390267Sdes return (-1); 21497859Sdes if (io->eof) 21590267Sdes return (0); 21690267Sdes 21797866Sdes if (io->chunked == 0) { 218174588Sdes if (http_growbuf(io, len) == -1) 21997866Sdes return (-1); 220231247Sbapt if ((nbytes = fetch_read(io->conn, io->buf, len)) == -1) { 221231247Sbapt io->error = errno; 22297866Sdes return (-1); 223106185Sdes } 224231247Sbapt io->buflen = nbytes; 22597866Sdes io->bufpos = 0; 22697866Sdes return (io->buflen); 22797866Sdes } 22897866Sdes 22997859Sdes if (io->chunksize == 0) { 230174588Sdes switch (http_new_chunk(io)) { 23190267Sdes case -1: 23297859Sdes io->error = 1; 23390267Sdes return (-1); 23490267Sdes case 0: 23597859Sdes io->eof = 1; 23690267Sdes return (0); 23790267Sdes } 23837535Sdes } 23963012Sdes 24097866Sdes if (len > io->chunksize) 24197866Sdes len = io->chunksize; 242174588Sdes if (http_growbuf(io, len) == -1) 24390267Sdes return (-1); 244231247Sbapt if ((nbytes = fetch_read(io->conn, io->buf, len)) == -1) { 245231247Sbapt io->error = errno; 24697866Sdes return (-1); 247106185Sdes } 248231247Sbapt io->buflen = nbytes; 24997866Sdes io->chunksize -= io->buflen; 25090267Sdes 25197859Sdes if (io->chunksize == 0) { 25297856Sdes char endl[2]; 25397856Sdes 254174588Sdes if (fetch_read(io->conn, endl, 2) != 2 || 25597856Sdes endl[0] != '\r' || endl[1] != '\n') 25690267Sdes return (-1); 25790267Sdes } 25890267Sdes 25997866Sdes io->bufpos = 0; 26090267Sdes 26197866Sdes return (io->buflen); 26237535Sdes} 26337535Sdes 26437608Sdes/* 26537608Sdes * Read function 26637608Sdes */ 26737535Sdesstatic int 268174588Sdeshttp_readfn(void *v, char *buf, int len) 26937535Sdes{ 27097859Sdes struct httpio *io = (struct httpio *)v; 27190267Sdes int l, pos; 27263012Sdes 27397859Sdes if (io->error) 27490267Sdes return (-1); 27597859Sdes if (io->eof) 27690267Sdes return (0); 27763012Sdes 27890267Sdes for (pos = 0; len > 0; pos += l, len -= l) { 27990267Sdes /* empty buffer */ 28097866Sdes if (!io->buf || io->bufpos == io->buflen) 281174588Sdes if (http_fillbuf(io, len) < 1) 28290267Sdes break; 28397866Sdes l = io->buflen - io->bufpos; 28490267Sdes if (len < l) 28590267Sdes l = len; 286176105Sdes memcpy(buf + pos, io->buf + io->bufpos, l); 28797866Sdes io->bufpos += l; 28890267Sdes } 28937535Sdes 290231247Sbapt if (!pos && io->error) { 291231247Sbapt if (io->error == EINTR) 292231247Sbapt io->error = 0; 29390267Sdes return (-1); 294231247Sbapt } 29590267Sdes return (pos); 29637535Sdes} 29737535Sdes 29837608Sdes/* 29937608Sdes * Write function 30037608Sdes */ 30137535Sdesstatic int 302174588Sdeshttp_writefn(void *v, const char *buf, int len) 30337535Sdes{ 30497859Sdes struct httpio *io = (struct httpio *)v; 30590267Sdes 306174588Sdes return (fetch_write(io->conn, buf, len)); 30737535Sdes} 30837535Sdes 30937608Sdes/* 31037608Sdes * Close function 31137608Sdes */ 31237535Sdesstatic int 313174588Sdeshttp_closefn(void *v) 31437535Sdes{ 31597859Sdes struct httpio *io = (struct httpio *)v; 31690267Sdes int r; 31763012Sdes 318174588Sdes r = fetch_close(io->conn); 31997859Sdes if (io->buf) 32097859Sdes free(io->buf); 32197859Sdes free(io); 32290267Sdes return (r); 32337535Sdes} 32437535Sdes 32537608Sdes/* 32663012Sdes * Wrap a file descriptor up 32737608Sdes */ 32863012Sdesstatic FILE * 329174588Sdeshttp_funopen(conn_t *conn, int chunked) 33037535Sdes{ 33197859Sdes struct httpio *io; 33290267Sdes FILE *f; 33363012Sdes 334109967Sdes if ((io = calloc(1, sizeof(*io))) == NULL) { 335174588Sdes fetch_syserr(); 33690267Sdes return (NULL); 33790267Sdes } 33897859Sdes io->conn = conn; 33997866Sdes io->chunked = chunked; 340174588Sdes f = funopen(io, http_readfn, http_writefn, NULL, http_closefn); 34190267Sdes if (f == NULL) { 342174588Sdes fetch_syserr(); 34397859Sdes free(io); 34490267Sdes return (NULL); 34590267Sdes } 34690267Sdes return (f); 34763012Sdes} 34863012Sdes 34990267Sdes 35063012Sdes/***************************************************************************** 35163012Sdes * Helper functions for talking to the server and parsing its replies 35263012Sdes */ 35363012Sdes 35463012Sdes/* Header types */ 35563012Sdestypedef enum { 35690267Sdes hdr_syserror = -2, 35790267Sdes hdr_error = -1, 35890267Sdes hdr_end = 0, 35990267Sdes hdr_unknown = 1, 36090267Sdes hdr_content_length, 36190267Sdes hdr_content_range, 36290267Sdes hdr_last_modified, 36390267Sdes hdr_location, 36490267Sdes hdr_transfer_encoding, 365202613Sdes hdr_www_authenticate, 366202613Sdes hdr_proxy_authenticate, 36785093Sdes} hdr_t; 36863012Sdes 36963012Sdes/* Names of interesting headers */ 37063012Sdesstatic struct { 37190267Sdes hdr_t num; 37290267Sdes const char *name; 37363012Sdes} hdr_names[] = { 37490267Sdes { hdr_content_length, "Content-Length" }, 37590267Sdes { hdr_content_range, "Content-Range" }, 37690267Sdes { hdr_last_modified, "Last-Modified" }, 37790267Sdes { hdr_location, "Location" }, 37890267Sdes { hdr_transfer_encoding, "Transfer-Encoding" }, 37990267Sdes { hdr_www_authenticate, "WWW-Authenticate" }, 380202613Sdes { hdr_proxy_authenticate, "Proxy-Authenticate" }, 38190267Sdes { hdr_unknown, NULL }, 38263012Sdes}; 38363012Sdes 38463012Sdes/* 38563012Sdes * Send a formatted line; optionally echo to terminal 38663012Sdes */ 38763012Sdesstatic int 388174588Sdeshttp_cmd(conn_t *conn, const char *fmt, ...) 38963012Sdes{ 39090267Sdes va_list ap; 39190267Sdes size_t len; 39290267Sdes char *msg; 39390267Sdes int r; 39463012Sdes 39590267Sdes va_start(ap, fmt); 39690267Sdes len = vasprintf(&msg, fmt, ap); 39790267Sdes va_end(ap); 39890267Sdes 39990267Sdes if (msg == NULL) { 40090267Sdes errno = ENOMEM; 401174588Sdes fetch_syserr(); 40290267Sdes return (-1); 40390267Sdes } 40490267Sdes 405174588Sdes r = fetch_putln(conn, msg, len); 40690267Sdes free(msg); 40790267Sdes 40890267Sdes if (r == -1) { 409174588Sdes fetch_syserr(); 41090267Sdes return (-1); 41190267Sdes } 41290267Sdes 41390267Sdes return (0); 41463012Sdes} 41563012Sdes 41663012Sdes/* 41763012Sdes * Get and parse status line 41863012Sdes */ 41963012Sdesstatic int 420174588Sdeshttp_get_reply(conn_t *conn) 42163012Sdes{ 42290267Sdes char *p; 42390267Sdes 424174588Sdes if (fetch_getln(conn) == -1) 42590267Sdes return (-1); 42690267Sdes /* 42790267Sdes * A valid status line looks like "HTTP/m.n xyz reason" where m 42890267Sdes * and n are the major and minor protocol version numbers and xyz 42990267Sdes * is the reply code. 43090267Sdes * Unfortunately, there are servers out there (NCSA 1.5.1, to name 43190267Sdes * just one) that do not send a version number, so we can't rely 43290267Sdes * on finding one, but if we do, insist on it being 1.0 or 1.1. 43390267Sdes * We don't care about the reason phrase. 43490267Sdes */ 43597856Sdes if (strncmp(conn->buf, "HTTP", 4) != 0) 43690267Sdes return (HTTP_PROTOCOL_ERROR); 43797856Sdes p = conn->buf + 4; 43890267Sdes if (*p == '/') { 43990267Sdes if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1')) 44090267Sdes return (HTTP_PROTOCOL_ERROR); 44190267Sdes p += 4; 44290267Sdes } 443174761Sdes if (*p != ' ' || 444174761Sdes !isdigit((unsigned char)p[1]) || 445174761Sdes !isdigit((unsigned char)p[2]) || 446174761Sdes !isdigit((unsigned char)p[3])) 44790267Sdes return (HTTP_PROTOCOL_ERROR); 44890267Sdes 44997856Sdes conn->err = (p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0'); 45097856Sdes return (conn->err); 45137535Sdes} 45237535Sdes 45337608Sdes/* 45490267Sdes * Check a header; if the type matches the given string, return a pointer 45590267Sdes * to the beginning of the value. 45663012Sdes */ 45775891Sarchiestatic const char * 458174588Sdeshttp_match(const char *str, const char *hdr) 45963012Sdes{ 460176036Sdes while (*str && *hdr && 461176036Sdes tolower((unsigned char)*str++) == tolower((unsigned char)*hdr++)) 46290267Sdes /* nothing */; 46390267Sdes if (*str || *hdr != ':') 46490267Sdes return (NULL); 465174761Sdes while (*hdr && isspace((unsigned char)*++hdr)) 46690267Sdes /* nothing */; 46790267Sdes return (hdr); 46863012Sdes} 46963012Sdes 470202613Sdes 47163012Sdes/* 472202613Sdes * Get the next header and return the appropriate symbolic code. We 473202613Sdes * need to read one line ahead for checking for a continuation line 474202613Sdes * belonging to the current header (continuation lines start with 475221821Sdes * white space). 476202613Sdes * 477202613Sdes * We get called with a fresh line already in the conn buffer, either 478202613Sdes * from the previous http_next_header() invocation, or, the first 479202613Sdes * time, from a fetch_getln() performed by our caller. 480202613Sdes * 481202613Sdes * This stops when we encounter an empty line (we dont read beyond the header 482202613Sdes * area). 483221821Sdes * 484202613Sdes * Note that the "headerbuf" is just a place to return the result. Its 485202613Sdes * contents are not used for the next call. This means that no cleanup 486202613Sdes * is needed when ie doing another connection, just call the cleanup when 487202613Sdes * fully done to deallocate memory. 48863012Sdes */ 489202613Sdes 490202613Sdes/* Limit the max number of continuation lines to some reasonable value */ 491202613Sdes#define HTTP_MAX_CONT_LINES 10 492202613Sdes 493202613Sdes/* Place into which to build a header from one or several lines */ 494202613Sdestypedef struct { 495202613Sdes char *buf; /* buffer */ 496202613Sdes size_t bufsize; /* buffer size */ 497202613Sdes size_t buflen; /* length of buffer contents */ 498202613Sdes} http_headerbuf_t; 499202613Sdes 500202613Sdesstatic void 501202613Sdesinit_http_headerbuf(http_headerbuf_t *buf) 50263012Sdes{ 503202613Sdes buf->buf = NULL; 504202613Sdes buf->bufsize = 0; 505202613Sdes buf->buflen = 0; 506202613Sdes} 50790267Sdes 508221821Sdesstatic void 509202613Sdesclean_http_headerbuf(http_headerbuf_t *buf) 510202613Sdes{ 511202613Sdes if (buf->buf) 512202613Sdes free(buf->buf); 513202613Sdes init_http_headerbuf(buf); 514202613Sdes} 515202613Sdes 516202613Sdes/* Remove whitespace at the end of the buffer */ 517221821Sdesstatic void 518202613Sdeshttp_conn_trimright(conn_t *conn) 519202613Sdes{ 520221821Sdes while (conn->buflen && 521202613Sdes isspace((unsigned char)conn->buf[conn->buflen - 1])) 52297856Sdes conn->buflen--; 52397856Sdes conn->buf[conn->buflen] = '\0'; 524202613Sdes} 525202613Sdes 526202613Sdesstatic hdr_t 527202613Sdeshttp_next_header(conn_t *conn, http_headerbuf_t *hbuf, const char **p) 528202613Sdes{ 529221820Sdes unsigned int i, len; 530202613Sdes 531221821Sdes /* 532202613Sdes * Have to do the stripping here because of the first line. So 533221821Sdes * it's done twice for the subsequent lines. No big deal 534202613Sdes */ 535202613Sdes http_conn_trimright(conn); 53697856Sdes if (conn->buflen == 0) 53797856Sdes return (hdr_end); 538202613Sdes 539202613Sdes /* Copy the line to the headerbuf */ 540202613Sdes if (hbuf->bufsize < conn->buflen + 1) { 541202613Sdes if ((hbuf->buf = realloc(hbuf->buf, conn->buflen + 1)) == NULL) 542202613Sdes return (hdr_syserror); 543202613Sdes hbuf->bufsize = conn->buflen + 1; 544202613Sdes } 545202613Sdes strcpy(hbuf->buf, conn->buf); 546202613Sdes hbuf->buflen = conn->buflen; 547202613Sdes 548221821Sdes /* 549202613Sdes * Fetch possible continuation lines. Stop at 1st non-continuation 550221821Sdes * and leave it in the conn buffer 551221821Sdes */ 552202613Sdes for (i = 0; i < HTTP_MAX_CONT_LINES; i++) { 553202613Sdes if (fetch_getln(conn) == -1) 554202613Sdes return (hdr_syserror); 555202613Sdes 556221821Sdes /* 557202613Sdes * Note: we carry on the idea from the previous version 558202613Sdes * that a pure whitespace line is equivalent to an empty 559202613Sdes * one (so it's not continuation and will be handled when 560221821Sdes * we are called next) 561202613Sdes */ 562202613Sdes http_conn_trimright(conn); 563202613Sdes if (conn->buf[0] != ' ' && conn->buf[0] != "\t"[0]) 564202613Sdes break; 565202613Sdes 566202613Sdes /* Got a continuation line. Concatenate to previous */ 567202613Sdes len = hbuf->buflen + conn->buflen; 568202613Sdes if (hbuf->bufsize < len + 1) { 569202613Sdes len *= 2; 570202613Sdes if ((hbuf->buf = realloc(hbuf->buf, len + 1)) == NULL) 571202613Sdes return (hdr_syserror); 572202613Sdes hbuf->bufsize = len + 1; 573202613Sdes } 574202613Sdes strcpy(hbuf->buf + hbuf->buflen, conn->buf); 575202613Sdes hbuf->buflen += conn->buflen; 576221821Sdes } 577202613Sdes 57890267Sdes /* 57990267Sdes * We could check for malformed headers but we don't really care. 58090267Sdes * A valid header starts with a token immediately followed by a 58190267Sdes * colon; a token is any sequence of non-control, non-whitespace 58290267Sdes * characters except "()<>@,;:\\\"{}". 58390267Sdes */ 58490267Sdes for (i = 0; hdr_names[i].num != hdr_unknown; i++) 585202613Sdes if ((*p = http_match(hdr_names[i].name, hbuf->buf)) != NULL) 58690267Sdes return (hdr_names[i].num); 587202613Sdes 58890267Sdes return (hdr_unknown); 58963012Sdes} 59063012Sdes 591202613Sdes/************************** 592202613Sdes * [Proxy-]Authenticate header parsing 593202613Sdes */ 594202613Sdes 595221821Sdes/* 596221821Sdes * Read doublequote-delimited string into output buffer obuf (allocated 597202613Sdes * by caller, whose responsibility it is to ensure that it's big enough) 598202613Sdes * cp points to the first char after the initial '"' 599221821Sdes * Handles \ quoting 600221821Sdes * Returns pointer to the first char after the terminating double quote, or 601202613Sdes * NULL for error. 602202613Sdes */ 603202613Sdesstatic const char * 604202613Sdeshttp_parse_headerstring(const char *cp, char *obuf) 605202613Sdes{ 606202613Sdes for (;;) { 607202613Sdes switch (*cp) { 608202613Sdes case 0: /* Unterminated string */ 609202613Sdes *obuf = 0; 610202613Sdes return (NULL); 611202613Sdes case '"': /* Ending quote */ 612202613Sdes *obuf = 0; 613202613Sdes return (++cp); 614202613Sdes case '\\': 615202613Sdes if (*++cp == 0) { 616202613Sdes *obuf = 0; 617202613Sdes return (NULL); 618202613Sdes } 619202613Sdes /* FALLTHROUGH */ 620202613Sdes default: 621202613Sdes *obuf++ = *cp++; 622202613Sdes } 623202613Sdes } 624202613Sdes} 625202613Sdes 626202613Sdes/* Http auth challenge schemes */ 627202613Sdestypedef enum {HTTPAS_UNKNOWN, HTTPAS_BASIC,HTTPAS_DIGEST} http_auth_schemes_t; 628202613Sdes 629202613Sdes/* Data holder for a Basic or Digest challenge. */ 630202613Sdestypedef struct { 631202613Sdes http_auth_schemes_t scheme; 632202613Sdes char *realm; 633202613Sdes char *qop; 634202613Sdes char *nonce; 635202613Sdes char *opaque; 636202613Sdes char *algo; 637202613Sdes int stale; 638202613Sdes int nc; /* Nonce count */ 639202613Sdes} http_auth_challenge_t; 640202613Sdes 641221821Sdesstatic void 642202613Sdesinit_http_auth_challenge(http_auth_challenge_t *b) 643202613Sdes{ 644202613Sdes b->scheme = HTTPAS_UNKNOWN; 645202613Sdes b->realm = b->qop = b->nonce = b->opaque = b->algo = NULL; 646202613Sdes b->stale = b->nc = 0; 647202613Sdes} 648202613Sdes 649221821Sdesstatic void 650202613Sdesclean_http_auth_challenge(http_auth_challenge_t *b) 651202613Sdes{ 652221821Sdes if (b->realm) 653202613Sdes free(b->realm); 654221821Sdes if (b->qop) 655202613Sdes free(b->qop); 656221821Sdes if (b->nonce) 657202613Sdes free(b->nonce); 658221821Sdes if (b->opaque) 659202613Sdes free(b->opaque); 660221821Sdes if (b->algo) 661202613Sdes free(b->algo); 662202613Sdes init_http_auth_challenge(b); 663202613Sdes} 664202613Sdes 665202613Sdes/* Data holder for an array of challenges offered in an http response. */ 666202613Sdes#define MAX_CHALLENGES 10 667202613Sdestypedef struct { 668202613Sdes http_auth_challenge_t *challenges[MAX_CHALLENGES]; 669202613Sdes int count; /* Number of parsed challenges in the array */ 670202613Sdes int valid; /* We did parse an authenticate header */ 671202613Sdes} http_auth_challenges_t; 672202613Sdes 673221821Sdesstatic void 674202613Sdesinit_http_auth_challenges(http_auth_challenges_t *cs) 675202613Sdes{ 676202613Sdes int i; 677202613Sdes for (i = 0; i < MAX_CHALLENGES; i++) 678202613Sdes cs->challenges[i] = NULL; 679202613Sdes cs->count = cs->valid = 0; 680202613Sdes} 681202613Sdes 682221821Sdesstatic void 683202613Sdesclean_http_auth_challenges(http_auth_challenges_t *cs) 684202613Sdes{ 685202613Sdes int i; 686202613Sdes /* We rely on non-zero pointers being allocated, not on the count */ 687202613Sdes for (i = 0; i < MAX_CHALLENGES; i++) { 688202613Sdes if (cs->challenges[i] != NULL) { 689202613Sdes clean_http_auth_challenge(cs->challenges[i]); 690202613Sdes free(cs->challenges[i]); 691202613Sdes } 692202613Sdes } 693202613Sdes init_http_auth_challenges(cs); 694202613Sdes} 695202613Sdes 696221821Sdes/* 697202613Sdes * Enumeration for lexical elements. Separators will be returned as their own 698202613Sdes * ascii value 699202613Sdes */ 700202613Sdestypedef enum {HTTPHL_WORD=256, HTTPHL_STRING=257, HTTPHL_END=258, 701202613Sdes HTTPHL_ERROR = 259} http_header_lex_t; 702202613Sdes 703221821Sdes/* 704202613Sdes * Determine what kind of token comes next and return possible value 705202613Sdes * in buf, which is supposed to have been allocated big enough by 706221821Sdes * caller. Advance input pointer and return element type. 707202613Sdes */ 708221821Sdesstatic int 709202613Sdeshttp_header_lex(const char **cpp, char *buf) 710202613Sdes{ 711202613Sdes size_t l; 712202613Sdes /* Eat initial whitespace */ 713202613Sdes *cpp += strspn(*cpp, " \t"); 714202613Sdes if (**cpp == 0) 715202613Sdes return (HTTPHL_END); 716202613Sdes 717202613Sdes /* Separator ? */ 718202613Sdes if (**cpp == ',' || **cpp == '=') 719202613Sdes return (*((*cpp)++)); 720202613Sdes 721202613Sdes /* String ? */ 722202613Sdes if (**cpp == '"') { 723202613Sdes *cpp = http_parse_headerstring(++*cpp, buf); 724202613Sdes if (*cpp == NULL) 725202613Sdes return (HTTPHL_ERROR); 726202613Sdes return (HTTPHL_STRING); 727202613Sdes } 728202613Sdes 729202613Sdes /* Read other token, until separator or whitespace */ 730202613Sdes l = strcspn(*cpp, " \t,="); 731202613Sdes memcpy(buf, *cpp, l); 732202613Sdes buf[l] = 0; 733202613Sdes *cpp += l; 734202613Sdes return (HTTPHL_WORD); 735202613Sdes} 736202613Sdes 737221821Sdes/* 738202613Sdes * Read challenges from http xxx-authenticate header and accumulate them 739202613Sdes * in the challenges list structure. 740202613Sdes * 741202613Sdes * Headers with multiple challenges are specified by rfc2617, but 742202613Sdes * servers (ie: squid) often send them in separate headers instead, 743202613Sdes * which in turn is forbidden by the http spec (multiple headers with 744202613Sdes * the same name are only allowed for pure comma-separated lists, see 745202613Sdes * rfc2616 sec 4.2). 746202613Sdes * 747202613Sdes * We support both approaches anyway 748202613Sdes */ 749221821Sdesstatic int 750202613Sdeshttp_parse_authenticate(const char *cp, http_auth_challenges_t *cs) 751202613Sdes{ 752202613Sdes int ret = -1; 753202613Sdes http_header_lex_t lex; 754202613Sdes char *key = malloc(strlen(cp) + 1); 755202613Sdes char *value = malloc(strlen(cp) + 1); 756202613Sdes char *buf = malloc(strlen(cp) + 1); 757202613Sdes 758202613Sdes if (key == NULL || value == NULL || buf == NULL) { 759202613Sdes fetch_syserr(); 760202613Sdes goto out; 761202613Sdes } 762202613Sdes 763202613Sdes /* In any case we've seen the header and we set the valid bit */ 764202613Sdes cs->valid = 1; 765202613Sdes 766202613Sdes /* Need word first */ 767202613Sdes lex = http_header_lex(&cp, key); 768202613Sdes if (lex != HTTPHL_WORD) 769202613Sdes goto out; 770202613Sdes 771202613Sdes /* Loop on challenges */ 772202613Sdes for (; cs->count < MAX_CHALLENGES; cs->count++) { 773221821Sdes cs->challenges[cs->count] = 774202613Sdes malloc(sizeof(http_auth_challenge_t)); 775202613Sdes if (cs->challenges[cs->count] == NULL) { 776202613Sdes fetch_syserr(); 777202613Sdes goto out; 778202613Sdes } 779202613Sdes init_http_auth_challenge(cs->challenges[cs->count]); 780202613Sdes if (!strcasecmp(key, "basic")) { 781202613Sdes cs->challenges[cs->count]->scheme = HTTPAS_BASIC; 782202613Sdes } else if (!strcasecmp(key, "digest")) { 783202613Sdes cs->challenges[cs->count]->scheme = HTTPAS_DIGEST; 784202613Sdes } else { 785202613Sdes cs->challenges[cs->count]->scheme = HTTPAS_UNKNOWN; 786221821Sdes /* 787221821Sdes * Continue parsing as basic or digest may 788202613Sdes * follow, and the syntax is the same for 789202613Sdes * all. We'll just ignore this one when 790202613Sdes * looking at the list 791202613Sdes */ 792202613Sdes } 793221821Sdes 794202613Sdes /* Loop on attributes */ 795202613Sdes for (;;) { 796202613Sdes /* Key */ 797202613Sdes lex = http_header_lex(&cp, key); 798202613Sdes if (lex != HTTPHL_WORD) 799202613Sdes goto out; 800202613Sdes 801202613Sdes /* Equal sign */ 802202613Sdes lex = http_header_lex(&cp, buf); 803202613Sdes if (lex != '=') 804202613Sdes goto out; 805202613Sdes 806202613Sdes /* Value */ 807202613Sdes lex = http_header_lex(&cp, value); 808202613Sdes if (lex != HTTPHL_WORD && lex != HTTPHL_STRING) 809202613Sdes goto out; 810202613Sdes 811202613Sdes if (!strcasecmp(key, "realm")) 812221821Sdes cs->challenges[cs->count]->realm = 813202613Sdes strdup(value); 814202613Sdes else if (!strcasecmp(key, "qop")) 815221821Sdes cs->challenges[cs->count]->qop = 816202613Sdes strdup(value); 817202613Sdes else if (!strcasecmp(key, "nonce")) 818221821Sdes cs->challenges[cs->count]->nonce = 819202613Sdes strdup(value); 820202613Sdes else if (!strcasecmp(key, "opaque")) 821221821Sdes cs->challenges[cs->count]->opaque = 822202613Sdes strdup(value); 823202613Sdes else if (!strcasecmp(key, "algorithm")) 824221821Sdes cs->challenges[cs->count]->algo = 825202613Sdes strdup(value); 826202613Sdes else if (!strcasecmp(key, "stale")) 827221821Sdes cs->challenges[cs->count]->stale = 828202613Sdes strcasecmp(value, "no"); 829202613Sdes /* Else ignore unknown attributes */ 830202613Sdes 831202613Sdes /* Comma or Next challenge or End */ 832202613Sdes lex = http_header_lex(&cp, key); 833221821Sdes /* 834221821Sdes * If we get a word here, this is the beginning of the 835221821Sdes * next challenge. Break the attributes loop 836221821Sdes */ 837202613Sdes if (lex == HTTPHL_WORD) 838202613Sdes break; 839202613Sdes 840202613Sdes if (lex == HTTPHL_END) { 841202613Sdes /* End while looking for ',' is normal exit */ 842202613Sdes cs->count++; 843202613Sdes ret = 0; 844202613Sdes goto out; 845202613Sdes } 846202613Sdes /* Anything else is an error */ 847202613Sdes if (lex != ',') 848202613Sdes goto out; 849202613Sdes 850202613Sdes } /* End attributes loop */ 851202613Sdes } /* End challenge loop */ 852202613Sdes 853221821Sdes /* 854221821Sdes * Challenges max count exceeded. This really can't happen 855221821Sdes * with normal data, something's fishy -> error 856221821Sdes */ 857202613Sdes 858202613Sdesout: 859202613Sdes if (key) 860202613Sdes free(key); 861202613Sdes if (value) 862202613Sdes free(value); 863202613Sdes if (buf) 864202613Sdes free(buf); 865202613Sdes return (ret); 866202613Sdes} 867202613Sdes 868202613Sdes 86963012Sdes/* 87063012Sdes * Parse a last-modified header 87163012Sdes */ 87263716Sdesstatic int 873174588Sdeshttp_parse_mtime(const char *p, time_t *mtime) 87463012Sdes{ 87590267Sdes char locale[64], *r; 87690267Sdes struct tm tm; 87763012Sdes 878109967Sdes strncpy(locale, setlocale(LC_TIME, NULL), sizeof(locale)); 87990267Sdes setlocale(LC_TIME, "C"); 88090267Sdes r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm); 88190267Sdes /* XXX should add support for date-2 and date-3 */ 88290267Sdes setlocale(LC_TIME, locale); 88390267Sdes if (r == NULL) 88490267Sdes return (-1); 88590267Sdes DEBUG(fprintf(stderr, "last modified: [%04d-%02d-%02d " 88688769Sdes "%02d:%02d:%02d]\n", 88763012Sdes tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 88863012Sdes tm.tm_hour, tm.tm_min, tm.tm_sec)); 88990267Sdes *mtime = timegm(&tm); 89090267Sdes return (0); 89163012Sdes} 89263012Sdes 89363012Sdes/* 89463012Sdes * Parse a content-length header 89563012Sdes */ 89663716Sdesstatic int 897174588Sdeshttp_parse_length(const char *p, off_t *length) 89863012Sdes{ 89990267Sdes off_t len; 90090267Sdes 901174761Sdes for (len = 0; *p && isdigit((unsigned char)*p); ++p) 90290267Sdes len = len * 10 + (*p - '0'); 90390267Sdes if (*p) 90490267Sdes return (-1); 90590267Sdes DEBUG(fprintf(stderr, "content length: [%lld]\n", 90690267Sdes (long long)len)); 90790267Sdes *length = len; 90890267Sdes return (0); 90963012Sdes} 91063012Sdes 91163012Sdes/* 91263012Sdes * Parse a content-range header 91363012Sdes */ 91463716Sdesstatic int 915174588Sdeshttp_parse_range(const char *p, off_t *offset, off_t *length, off_t *size) 91663012Sdes{ 91790267Sdes off_t first, last, len; 91863716Sdes 91990267Sdes if (strncasecmp(p, "bytes ", 6) != 0) 92090267Sdes return (-1); 921125696Sdes p += 6; 922125696Sdes if (*p == '*') { 923125696Sdes first = last = -1; 924125696Sdes ++p; 925125696Sdes } else { 926174761Sdes for (first = 0; *p && isdigit((unsigned char)*p); ++p) 927125696Sdes first = first * 10 + *p - '0'; 928125696Sdes if (*p != '-') 929125696Sdes return (-1); 930174761Sdes for (last = 0, ++p; *p && isdigit((unsigned char)*p); ++p) 931125696Sdes last = last * 10 + *p - '0'; 932125696Sdes } 93390267Sdes if (first > last || *p != '/') 93490267Sdes return (-1); 935174761Sdes for (len = 0, ++p; *p && isdigit((unsigned char)*p); ++p) 93690267Sdes len = len * 10 + *p - '0'; 93790267Sdes if (*p || len < last - first + 1) 93890267Sdes return (-1); 939125696Sdes if (first == -1) { 940125696Sdes DEBUG(fprintf(stderr, "content range: [*/%lld]\n", 941125696Sdes (long long)len)); 942125696Sdes *length = 0; 943125696Sdes } else { 944125696Sdes DEBUG(fprintf(stderr, "content range: [%lld-%lld/%lld]\n", 945125696Sdes (long long)first, (long long)last, (long long)len)); 946125696Sdes *length = last - first + 1; 947125696Sdes } 94890267Sdes *offset = first; 94990267Sdes *size = len; 95090267Sdes return (0); 95163012Sdes} 95263012Sdes 95390267Sdes 95463012Sdes/***************************************************************************** 95563012Sdes * Helper functions for authorization 95663012Sdes */ 95763012Sdes 95863012Sdes/* 95937608Sdes * Base64 encoding 96037608Sdes */ 96162965Sdesstatic char * 962174588Sdeshttp_base64(const char *src) 96337608Sdes{ 96490267Sdes static const char base64[] = 96590267Sdes "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 96690267Sdes "abcdefghijklmnopqrstuvwxyz" 96790267Sdes "0123456789+/"; 96890267Sdes char *str, *dst; 96990267Sdes size_t l; 97090267Sdes int t, r; 97162965Sdes 97290267Sdes l = strlen(src); 973133280Sdes if ((str = malloc(((l + 2) / 3) * 4 + 1)) == NULL) 97490267Sdes return (NULL); 97590267Sdes dst = str; 97690267Sdes r = 0; 97737608Sdes 97890267Sdes while (l >= 3) { 97990267Sdes t = (src[0] << 16) | (src[1] << 8) | src[2]; 98090267Sdes dst[0] = base64[(t >> 18) & 0x3f]; 98190267Sdes dst[1] = base64[(t >> 12) & 0x3f]; 98290267Sdes dst[2] = base64[(t >> 6) & 0x3f]; 98390267Sdes dst[3] = base64[(t >> 0) & 0x3f]; 98490267Sdes src += 3; l -= 3; 98590267Sdes dst += 4; r += 4; 98690267Sdes } 98737608Sdes 98890267Sdes switch (l) { 98990267Sdes case 2: 99090267Sdes t = (src[0] << 16) | (src[1] << 8); 99190267Sdes dst[0] = base64[(t >> 18) & 0x3f]; 99290267Sdes dst[1] = base64[(t >> 12) & 0x3f]; 99390267Sdes dst[2] = base64[(t >> 6) & 0x3f]; 99490267Sdes dst[3] = '='; 99590267Sdes dst += 4; 99690267Sdes r += 4; 99790267Sdes break; 99890267Sdes case 1: 99990267Sdes t = src[0] << 16; 100090267Sdes dst[0] = base64[(t >> 18) & 0x3f]; 100190267Sdes dst[1] = base64[(t >> 12) & 0x3f]; 100290267Sdes dst[2] = dst[3] = '='; 100390267Sdes dst += 4; 100490267Sdes r += 4; 100590267Sdes break; 100690267Sdes case 0: 100790267Sdes break; 100890267Sdes } 100990267Sdes 101090267Sdes *dst = 0; 101190267Sdes return (str); 101237608Sdes} 101337608Sdes 1014202613Sdes 101537608Sdes/* 1016202613Sdes * Extract authorization parameters from environment value. 1017202613Sdes * The value is like scheme:realm:user:pass 1018202613Sdes */ 1019202613Sdestypedef struct { 1020202613Sdes char *scheme; 1021202613Sdes char *realm; 1022202613Sdes char *user; 1023202613Sdes char *password; 1024202613Sdes} http_auth_params_t; 1025202613Sdes 1026202613Sdesstatic void 1027202613Sdesinit_http_auth_params(http_auth_params_t *s) 1028202613Sdes{ 1029202613Sdes s->scheme = s->realm = s->user = s->password = 0; 1030202613Sdes} 1031202613Sdes 1032221821Sdesstatic void 1033202613Sdesclean_http_auth_params(http_auth_params_t *s) 1034202613Sdes{ 1035221821Sdes if (s->scheme) 1036202613Sdes free(s->scheme); 1037221821Sdes if (s->realm) 1038202613Sdes free(s->realm); 1039221821Sdes if (s->user) 1040202613Sdes free(s->user); 1041221821Sdes if (s->password) 1042202613Sdes free(s->password); 1043202613Sdes init_http_auth_params(s); 1044202613Sdes} 1045202613Sdes 1046202613Sdesstatic int 1047202613Sdeshttp_authfromenv(const char *p, http_auth_params_t *parms) 1048202613Sdes{ 1049202613Sdes int ret = -1; 1050202613Sdes char *v, *ve; 1051202613Sdes char *str = strdup(p); 1052202613Sdes 1053202613Sdes if (str == NULL) { 1054202613Sdes fetch_syserr(); 1055202613Sdes return (-1); 1056202613Sdes } 1057202613Sdes v = str; 1058202613Sdes 1059202613Sdes if ((ve = strchr(v, ':')) == NULL) 1060202613Sdes goto out; 1061202613Sdes 1062202613Sdes *ve = 0; 1063202613Sdes if ((parms->scheme = strdup(v)) == NULL) { 1064202613Sdes fetch_syserr(); 1065202613Sdes goto out; 1066202613Sdes } 1067202613Sdes v = ve + 1; 1068202613Sdes 1069202613Sdes if ((ve = strchr(v, ':')) == NULL) 1070202613Sdes goto out; 1071202613Sdes 1072202613Sdes *ve = 0; 1073202613Sdes if ((parms->realm = strdup(v)) == NULL) { 1074202613Sdes fetch_syserr(); 1075202613Sdes goto out; 1076202613Sdes } 1077202613Sdes v = ve + 1; 1078202613Sdes 1079202613Sdes if ((ve = strchr(v, ':')) == NULL) 1080202613Sdes goto out; 1081202613Sdes 1082202613Sdes *ve = 0; 1083202613Sdes if ((parms->user = strdup(v)) == NULL) { 1084202613Sdes fetch_syserr(); 1085202613Sdes goto out; 1086202613Sdes } 1087202613Sdes v = ve + 1; 1088202613Sdes 1089202613Sdes 1090202613Sdes if ((parms->password = strdup(v)) == NULL) { 1091202613Sdes fetch_syserr(); 1092202613Sdes goto out; 1093202613Sdes } 1094202613Sdes ret = 0; 1095202613Sdesout: 1096221821Sdes if (ret == -1) 1097202613Sdes clean_http_auth_params(parms); 1098202613Sdes if (str) 1099202613Sdes free(str); 1100202613Sdes return (ret); 1101202613Sdes} 1102202613Sdes 1103202613Sdes 1104221821Sdes/* 1105202613Sdes * Digest response: the code to compute the digest is taken from the 1106221821Sdes * sample implementation in RFC2616 1107202613Sdes */ 1108221822Sdes#define IN const 1109202613Sdes#define OUT 1110202613Sdes 1111202613Sdes#define HASHLEN 16 1112202613Sdestypedef char HASH[HASHLEN]; 1113202613Sdes#define HASHHEXLEN 32 1114202613Sdestypedef char HASHHEX[HASHHEXLEN+1]; 1115202613Sdes 1116202613Sdesstatic const char *hexchars = "0123456789abcdef"; 1117221821Sdesstatic void 1118202613SdesCvtHex(IN HASH Bin, OUT HASHHEX Hex) 1119202613Sdes{ 1120202613Sdes unsigned short i; 1121202613Sdes unsigned char j; 1122202613Sdes 1123202613Sdes for (i = 0; i < HASHLEN; i++) { 1124202613Sdes j = (Bin[i] >> 4) & 0xf; 1125202613Sdes Hex[i*2] = hexchars[j]; 1126202613Sdes j = Bin[i] & 0xf; 1127202613Sdes Hex[i*2+1] = hexchars[j]; 1128202613Sdes }; 1129202613Sdes Hex[HASHHEXLEN] = '\0'; 1130202613Sdes}; 1131202613Sdes 1132202613Sdes/* calculate H(A1) as per spec */ 1133221821Sdesstatic void 1134202613SdesDigestCalcHA1( 1135202613Sdes IN char * pszAlg, 1136202613Sdes IN char * pszUserName, 1137202613Sdes IN char * pszRealm, 1138202613Sdes IN char * pszPassword, 1139202613Sdes IN char * pszNonce, 1140202613Sdes IN char * pszCNonce, 1141202613Sdes OUT HASHHEX SessionKey 1142202613Sdes ) 1143202613Sdes{ 1144202613Sdes MD5_CTX Md5Ctx; 1145202613Sdes HASH HA1; 1146202613Sdes 1147202613Sdes MD5Init(&Md5Ctx); 1148202613Sdes MD5Update(&Md5Ctx, pszUserName, strlen(pszUserName)); 1149202613Sdes MD5Update(&Md5Ctx, ":", 1); 1150202613Sdes MD5Update(&Md5Ctx, pszRealm, strlen(pszRealm)); 1151202613Sdes MD5Update(&Md5Ctx, ":", 1); 1152202613Sdes MD5Update(&Md5Ctx, pszPassword, strlen(pszPassword)); 1153202613Sdes MD5Final(HA1, &Md5Ctx); 1154202613Sdes if (strcasecmp(pszAlg, "md5-sess") == 0) { 1155202613Sdes 1156202613Sdes MD5Init(&Md5Ctx); 1157202613Sdes MD5Update(&Md5Ctx, HA1, HASHLEN); 1158202613Sdes MD5Update(&Md5Ctx, ":", 1); 1159202613Sdes MD5Update(&Md5Ctx, pszNonce, strlen(pszNonce)); 1160202613Sdes MD5Update(&Md5Ctx, ":", 1); 1161202613Sdes MD5Update(&Md5Ctx, pszCNonce, strlen(pszCNonce)); 1162202613Sdes MD5Final(HA1, &Md5Ctx); 1163202613Sdes }; 1164202613Sdes CvtHex(HA1, SessionKey); 1165202613Sdes} 1166202613Sdes 1167202613Sdes/* calculate request-digest/response-digest as per HTTP Digest spec */ 1168221821Sdesstatic void 1169202613SdesDigestCalcResponse( 1170202613Sdes IN HASHHEX HA1, /* H(A1) */ 1171202613Sdes IN char * pszNonce, /* nonce from server */ 1172202613Sdes IN char * pszNonceCount, /* 8 hex digits */ 1173202613Sdes IN char * pszCNonce, /* client nonce */ 1174202613Sdes IN char * pszQop, /* qop-value: "", "auth", "auth-int" */ 1175202613Sdes IN char * pszMethod, /* method from the request */ 1176202613Sdes IN char * pszDigestUri, /* requested URL */ 1177202613Sdes IN HASHHEX HEntity, /* H(entity body) if qop="auth-int" */ 1178202613Sdes OUT HASHHEX Response /* request-digest or response-digest */ 1179202613Sdes ) 1180202613Sdes{ 1181221821Sdes/* DEBUG(fprintf(stderr, 1182202613Sdes "Calc: HA1[%s] Nonce[%s] qop[%s] method[%s] URI[%s]\n", 1183202613Sdes HA1, pszNonce, pszQop, pszMethod, pszDigestUri));*/ 1184202613Sdes MD5_CTX Md5Ctx; 1185202613Sdes HASH HA2; 1186202613Sdes HASH RespHash; 1187202613Sdes HASHHEX HA2Hex; 1188202613Sdes 1189202613Sdes // calculate H(A2) 1190202613Sdes MD5Init(&Md5Ctx); 1191202613Sdes MD5Update(&Md5Ctx, pszMethod, strlen(pszMethod)); 1192202613Sdes MD5Update(&Md5Ctx, ":", 1); 1193202613Sdes MD5Update(&Md5Ctx, pszDigestUri, strlen(pszDigestUri)); 1194202613Sdes if (strcasecmp(pszQop, "auth-int") == 0) { 1195202613Sdes MD5Update(&Md5Ctx, ":", 1); 1196202613Sdes MD5Update(&Md5Ctx, HEntity, HASHHEXLEN); 1197202613Sdes }; 1198202613Sdes MD5Final(HA2, &Md5Ctx); 1199202613Sdes CvtHex(HA2, HA2Hex); 1200202613Sdes 1201202613Sdes // calculate response 1202202613Sdes MD5Init(&Md5Ctx); 1203202613Sdes MD5Update(&Md5Ctx, HA1, HASHHEXLEN); 1204202613Sdes MD5Update(&Md5Ctx, ":", 1); 1205202613Sdes MD5Update(&Md5Ctx, pszNonce, strlen(pszNonce)); 1206202613Sdes MD5Update(&Md5Ctx, ":", 1); 1207202613Sdes if (*pszQop) { 1208202613Sdes MD5Update(&Md5Ctx, pszNonceCount, strlen(pszNonceCount)); 1209202613Sdes MD5Update(&Md5Ctx, ":", 1); 1210202613Sdes MD5Update(&Md5Ctx, pszCNonce, strlen(pszCNonce)); 1211202613Sdes MD5Update(&Md5Ctx, ":", 1); 1212202613Sdes MD5Update(&Md5Ctx, pszQop, strlen(pszQop)); 1213202613Sdes MD5Update(&Md5Ctx, ":", 1); 1214202613Sdes }; 1215202613Sdes MD5Update(&Md5Ctx, HA2Hex, HASHHEXLEN); 1216202613Sdes MD5Final(RespHash, &Md5Ctx); 1217202613Sdes CvtHex(RespHash, Response); 1218202613Sdes} 1219202613Sdes 1220221821Sdes/* 1221221821Sdes * Generate/Send a Digest authorization header 1222202613Sdes * This looks like: [Proxy-]Authorization: credentials 1223202613Sdes * 1224202613Sdes * credentials = "Digest" digest-response 1225202613Sdes * digest-response = 1#( username | realm | nonce | digest-uri 1226202613Sdes * | response | [ algorithm ] | [cnonce] | 1227202613Sdes * [opaque] | [message-qop] | 1228202613Sdes * [nonce-count] | [auth-param] ) 1229202613Sdes * username = "username" "=" username-value 1230202613Sdes * username-value = quoted-string 1231202613Sdes * digest-uri = "uri" "=" digest-uri-value 1232202613Sdes * digest-uri-value = request-uri ; As specified by HTTP/1.1 1233202613Sdes * message-qop = "qop" "=" qop-value 1234202613Sdes * cnonce = "cnonce" "=" cnonce-value 1235202613Sdes * cnonce-value = nonce-value 1236202613Sdes * nonce-count = "nc" "=" nc-value 1237202613Sdes * nc-value = 8LHEX 1238202613Sdes * response = "response" "=" request-digest 1239202613Sdes * request-digest = <"> 32LHEX <"> 1240202613Sdes */ 1241202613Sdesstatic int 1242202613Sdeshttp_digest_auth(conn_t *conn, const char *hdr, http_auth_challenge_t *c, 1243202613Sdes http_auth_params_t *parms, struct url *url) 1244202613Sdes{ 1245202613Sdes int r; 1246202613Sdes char noncecount[10]; 1247202613Sdes char cnonce[40]; 1248202613Sdes char *options = 0; 1249202613Sdes 1250202613Sdes if (!c->realm || !c->nonce) { 1251202613Sdes DEBUG(fprintf(stderr, "realm/nonce not set in challenge\n")); 1252202613Sdes return(-1); 1253202613Sdes } 1254221821Sdes if (!c->algo) 1255202613Sdes c->algo = strdup(""); 1256202613Sdes 1257221821Sdes if (asprintf(&options, "%s%s%s%s", 1258202613Sdes *c->algo? ",algorithm=" : "", c->algo, 1259202613Sdes c->opaque? ",opaque=" : "", c->opaque?c->opaque:"")== -1) 1260202613Sdes return (-1); 1261202613Sdes 1262202613Sdes if (!c->qop) { 1263202613Sdes c->qop = strdup(""); 1264202613Sdes *noncecount = 0; 1265202613Sdes *cnonce = 0; 1266202613Sdes } else { 1267202613Sdes c->nc++; 1268202613Sdes sprintf(noncecount, "%08x", c->nc); 1269202613Sdes /* We don't try very hard with the cnonce ... */ 1270202613Sdes sprintf(cnonce, "%x%lx", getpid(), (unsigned long)time(0)); 1271202613Sdes } 1272202613Sdes 1273202613Sdes HASHHEX HA1; 1274202613Sdes DigestCalcHA1(c->algo, parms->user, c->realm, 1275202613Sdes parms->password, c->nonce, cnonce, HA1); 1276202613Sdes DEBUG(fprintf(stderr, "HA1: [%s]\n", HA1)); 1277202613Sdes HASHHEX digest; 1278202613Sdes DigestCalcResponse(HA1, c->nonce, noncecount, cnonce, c->qop, 1279202613Sdes "GET", url->doc, "", digest); 1280202613Sdes 1281202613Sdes if (c->qop[0]) { 1282202613Sdes r = http_cmd(conn, "%s: Digest username=\"%s\",realm=\"%s\"," 1283202613Sdes "nonce=\"%s\",uri=\"%s\",response=\"%s\"," 1284202613Sdes "qop=\"auth\", cnonce=\"%s\", nc=%s%s", 1285221821Sdes hdr, parms->user, c->realm, 1286202613Sdes c->nonce, url->doc, digest, 1287202613Sdes cnonce, noncecount, options); 1288202613Sdes } else { 1289202613Sdes r = http_cmd(conn, "%s: Digest username=\"%s\",realm=\"%s\"," 1290202613Sdes "nonce=\"%s\",uri=\"%s\",response=\"%s\"%s", 1291221821Sdes hdr, parms->user, c->realm, 1292202613Sdes c->nonce, url->doc, digest, options); 1293202613Sdes } 1294202613Sdes if (options) 1295202613Sdes free(options); 1296202613Sdes return (r); 1297202613Sdes} 1298202613Sdes 1299202613Sdes/* 130037608Sdes * Encode username and password 130137608Sdes */ 130262965Sdesstatic int 1303174588Sdeshttp_basic_auth(conn_t *conn, const char *hdr, const char *usr, const char *pwd) 130437608Sdes{ 130590267Sdes char *upw, *auth; 130690267Sdes int r; 130737608Sdes 1308202613Sdes DEBUG(fprintf(stderr, "basic: usr: [%s]\n", usr)); 1309202613Sdes DEBUG(fprintf(stderr, "basic: pwd: [%s]\n", pwd)); 131090267Sdes if (asprintf(&upw, "%s:%s", usr, pwd) == -1) 131190267Sdes return (-1); 1312174588Sdes auth = http_base64(upw); 131390267Sdes free(upw); 131490267Sdes if (auth == NULL) 131590267Sdes return (-1); 1316174588Sdes r = http_cmd(conn, "%s: Basic %s", hdr, auth); 131790267Sdes free(auth); 131890267Sdes return (r); 131962965Sdes} 132062965Sdes 132162965Sdes/* 1322221821Sdes * Chose the challenge to answer and call the appropriate routine to 1323202613Sdes * produce the header. 132462965Sdes */ 132562965Sdesstatic int 1326202613Sdeshttp_authorize(conn_t *conn, const char *hdr, http_auth_challenges_t *cs, 1327202613Sdes http_auth_params_t *parms, struct url *url) 132862965Sdes{ 1329202613Sdes http_auth_challenge_t *basic = NULL; 1330202613Sdes http_auth_challenge_t *digest = NULL; 1331202613Sdes int i; 133262965Sdes 1333202613Sdes /* If user or pass are null we're not happy */ 1334202613Sdes if (!parms->user || !parms->password) { 1335202613Sdes DEBUG(fprintf(stderr, "NULL usr or pass\n")); 1336202613Sdes return (-1); 133790267Sdes } 1338202613Sdes 1339202613Sdes /* Look for a Digest and a Basic challenge */ 1340202613Sdes for (i = 0; i < cs->count; i++) { 1341202613Sdes if (cs->challenges[i]->scheme == HTTPAS_BASIC) 1342202613Sdes basic = cs->challenges[i]; 1343202613Sdes if (cs->challenges[i]->scheme == HTTPAS_DIGEST) 1344202613Sdes digest = cs->challenges[i]; 1345202613Sdes } 1346202613Sdes 1347202613Sdes /* Error if "Digest" was specified and there is no Digest challenge */ 1348221821Sdes if (!digest && (parms->scheme && 1349202613Sdes !strcasecmp(parms->scheme, "digest"))) { 1350221821Sdes DEBUG(fprintf(stderr, 1351202613Sdes "Digest auth in env, not supported by peer\n")); 1352202613Sdes return (-1); 1353202613Sdes } 1354221821Sdes /* 1355221821Sdes * If "basic" was specified in the environment, or there is no Digest 1356202613Sdes * challenge, do the basic thing. Don't need a challenge for this, 1357221821Sdes * so no need to check basic!=NULL 1358202613Sdes */ 1359202613Sdes if (!digest || (parms->scheme && !strcasecmp(parms->scheme,"basic"))) 1360202613Sdes return (http_basic_auth(conn,hdr,parms->user,parms->password)); 1361202613Sdes 1362202613Sdes /* Else, prefer digest. We just checked that it's not NULL */ 1363202613Sdes return (http_digest_auth(conn, hdr, digest, parms, url)); 136437608Sdes} 136537608Sdes 136663012Sdes/***************************************************************************** 136763012Sdes * Helper functions for connecting to a server or proxy 136863012Sdes */ 136963012Sdes 137037608Sdes/* 137190267Sdes * Connect to the correct HTTP server or proxy. 137263012Sdes */ 137397856Sdesstatic conn_t * 1374174588Sdeshttp_connect(struct url *URL, struct url *purl, const char *flags) 137563012Sdes{ 1376251001Sdes struct url *curl; 137797856Sdes conn_t *conn; 137890267Sdes int verbose; 1379141958Skbyanc int af, val; 138090267Sdes 138163012Sdes#ifdef INET6 138290267Sdes af = AF_UNSPEC; 138360737Sume#else 138490267Sdes af = AF_INET; 138560737Sume#endif 138690267Sdes 138790267Sdes verbose = CHECK_FLAG('v'); 138890267Sdes if (CHECK_FLAG('4')) 138990267Sdes af = AF_INET; 139067043Sdes#ifdef INET6 139190267Sdes else if (CHECK_FLAG('6')) 139290267Sdes af = AF_INET6; 139367043Sdes#endif 139467043Sdes 1395251001Sdes curl = (purl != NULL) ? purl : URL; 139690267Sdes 1397251001Sdes if ((conn = fetch_connect(curl->host, curl->port, af, verbose)) == NULL) 1398174588Sdes /* fetch_connect() has already set an error code */ 139997856Sdes return (NULL); 1400251001Sdes if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 && purl) { 1401251001Sdes http_cmd(conn, "CONNECT %s:%d HTTP/1.1", 1402251001Sdes URL->host, URL->port); 1403256257Sglebius http_cmd(conn, "Host: %s:%d", 1404256257Sglebius URL->host, URL->port); 1405251001Sdes http_cmd(conn, ""); 1406251001Sdes if (http_get_reply(conn) != HTTP_OK) { 1407251001Sdes fetch_close(conn); 1408251001Sdes return (NULL); 1409251001Sdes } 1410251001Sdes http_get_reply(conn); 1411251001Sdes } 141297868Sdes if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 && 1413256257Sglebius fetch_ssl(conn, URL, verbose) == -1) { 1414174588Sdes fetch_close(conn); 141597891Sdes /* grrr */ 141697891Sdes errno = EAUTH; 1417174588Sdes fetch_syserr(); 141897868Sdes return (NULL); 141997868Sdes } 1420141958Skbyanc 1421141958Skbyanc val = 1; 1422141958Skbyanc setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, sizeof(val)); 1423141958Skbyanc 142497856Sdes return (conn); 142567043Sdes} 142667043Sdes 142767043Sdesstatic struct url * 1428174752Sdeshttp_get_proxy(struct url * url, const char *flags) 142967043Sdes{ 143090267Sdes struct url *purl; 143190267Sdes char *p; 143290267Sdes 1433112797Sdes if (flags != NULL && strchr(flags, 'd') != NULL) 1434112081Sdes return (NULL); 1435174752Sdes if (fetch_no_proxy_match(url->host)) 1436174752Sdes return (NULL); 143790267Sdes if (((p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 1438149414Sdes *p && (purl = fetchParseURL(p))) { 143990267Sdes if (!*purl->scheme) 144090267Sdes strcpy(purl->scheme, SCHEME_HTTP); 144190267Sdes if (!purl->port) 1442174588Sdes purl->port = fetch_default_proxy_port(purl->scheme); 144390267Sdes if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 144490267Sdes return (purl); 144590267Sdes fetchFreeURL(purl); 144690267Sdes } 144790267Sdes return (NULL); 144860376Sdes} 144960376Sdes 145088771Sdesstatic void 1451174588Sdeshttp_print_html(FILE *out, FILE *in) 145288771Sdes{ 145390267Sdes size_t len; 145490267Sdes char *line, *p, *q; 145590267Sdes int comment, tag; 145688771Sdes 145790267Sdes comment = tag = 0; 145890267Sdes while ((line = fgetln(in, &len)) != NULL) { 1459174761Sdes while (len && isspace((unsigned char)line[len - 1])) 146090267Sdes --len; 146190267Sdes for (p = q = line; q < line + len; ++q) { 146290267Sdes if (comment && *q == '-') { 146390267Sdes if (q + 2 < line + len && 146490267Sdes strcmp(q, "-->") == 0) { 146590267Sdes tag = comment = 0; 146690267Sdes q += 2; 146790267Sdes } 146890267Sdes } else if (tag && !comment && *q == '>') { 146990267Sdes p = q + 1; 147090267Sdes tag = 0; 147190267Sdes } else if (!tag && *q == '<') { 147290267Sdes if (q > p) 147390267Sdes fwrite(p, q - p, 1, out); 147490267Sdes tag = 1; 147590267Sdes if (q + 3 < line + len && 147690267Sdes strcmp(q, "<!--") == 0) { 147790267Sdes comment = 1; 147890267Sdes q += 3; 147990267Sdes } 148090267Sdes } 148188771Sdes } 148290267Sdes if (!tag && q > p) 148390267Sdes fwrite(p, q - p, 1, out); 148490267Sdes fputc('\n', out); 148588771Sdes } 148688771Sdes} 148788771Sdes 148890267Sdes 148963012Sdes/***************************************************************************** 149063012Sdes * Core 149160954Sdes */ 149260954Sdes 149360954Sdes/* 149463012Sdes * Send a request and process the reply 149597866Sdes * 149697866Sdes * XXX This function is way too long, the do..while loop should be split 149797866Sdes * XXX off into a separate function. 149860376Sdes */ 149967043SdesFILE * 1500174588Sdeshttp_request(struct url *URL, const char *op, struct url_stat *us, 1501202613Sdes struct url *purl, const char *flags) 150260376Sdes{ 1503186124Smurray char timebuf[80]; 1504186124Smurray char hbuf[MAXHOSTNAMELEN + 7], *host; 150597856Sdes conn_t *conn; 150690267Sdes struct url *url, *new; 1507202613Sdes int chunked, direct, ims, noredirect, verbose; 1508143049Skbyanc int e, i, n, val; 150990267Sdes off_t offset, clength, length, size; 151090267Sdes time_t mtime; 151190267Sdes const char *p; 151290267Sdes FILE *f; 151390267Sdes hdr_t h; 1514186124Smurray struct tm *timestruct; 1515202613Sdes http_headerbuf_t headerbuf; 1516202613Sdes http_auth_challenges_t server_challenges; 1517202613Sdes http_auth_challenges_t proxy_challenges; 151863012Sdes 1519202613Sdes /* The following calls don't allocate anything */ 1520221821Sdes init_http_headerbuf(&headerbuf); 1521202613Sdes init_http_auth_challenges(&server_challenges); 1522202613Sdes init_http_auth_challenges(&proxy_challenges); 1523202613Sdes 152490267Sdes direct = CHECK_FLAG('d'); 152590267Sdes noredirect = CHECK_FLAG('A'); 152690267Sdes verbose = CHECK_FLAG('v'); 1527186124Smurray ims = CHECK_FLAG('i'); 152860737Sume 152990267Sdes if (direct && purl) { 153090267Sdes fetchFreeURL(purl); 153190267Sdes purl = NULL; 153290267Sdes } 153363716Sdes 153490267Sdes /* try the provided URL first */ 153590267Sdes url = URL; 153663012Sdes 1537242289Seadler n = MAX_REDIRECT; 153890267Sdes i = 0; 153963012Sdes 154098422Sdes e = HTTP_PROTOCOL_ERROR; 154190267Sdes do { 154290267Sdes new = NULL; 154390267Sdes chunked = 0; 154490267Sdes offset = 0; 154590267Sdes clength = -1; 154690267Sdes length = -1; 154790267Sdes size = -1; 154890267Sdes mtime = 0; 154990267Sdes 155090267Sdes /* check port */ 155190267Sdes if (!url->port) 1552174588Sdes url->port = fetch_default_port(url->scheme); 155390267Sdes 155490267Sdes /* were we redirected to an FTP URL? */ 155590267Sdes if (purl == NULL && strcmp(url->scheme, SCHEME_FTP) == 0) { 155690267Sdes if (strcmp(op, "GET") == 0) 1557174588Sdes return (ftp_request(url, "RETR", us, purl, flags)); 155890267Sdes else if (strcmp(op, "HEAD") == 0) 1559174588Sdes return (ftp_request(url, "STAT", us, purl, flags)); 156090267Sdes } 156190267Sdes 156290267Sdes /* connect to server or proxy */ 1563174588Sdes if ((conn = http_connect(url, purl, flags)) == NULL) 156490267Sdes goto ouch; 156590267Sdes 156690267Sdes host = url->host; 156760737Sume#ifdef INET6 156890267Sdes if (strchr(url->host, ':')) { 156990267Sdes snprintf(hbuf, sizeof(hbuf), "[%s]", url->host); 157090267Sdes host = hbuf; 157190267Sdes } 157260737Sume#endif 1573174588Sdes if (url->port != fetch_default_port(url->scheme)) { 1574107372Sdes if (host != hbuf) { 1575107372Sdes strcpy(hbuf, host); 1576107372Sdes host = hbuf; 1577107372Sdes } 1578107372Sdes snprintf(hbuf + strlen(hbuf), 1579107372Sdes sizeof(hbuf) - strlen(hbuf), ":%d", url->port); 1580107372Sdes } 158137535Sdes 158290267Sdes /* send request */ 158390267Sdes if (verbose) 1584174588Sdes fetch_info("requesting %s://%s%s", 1585107372Sdes url->scheme, host, url->doc); 1586256257Sglebius if (purl && strcasecmp(URL->scheme, SCHEME_HTTPS) != 0) { 1587174588Sdes http_cmd(conn, "%s %s://%s%s HTTP/1.1", 1588107372Sdes op, url->scheme, host, url->doc); 158990267Sdes } else { 1590174588Sdes http_cmd(conn, "%s %s HTTP/1.1", 159190267Sdes op, url->doc); 159290267Sdes } 159337535Sdes 1594186124Smurray if (ims && url->ims_time) { 1595186124Smurray timestruct = gmtime((time_t *)&url->ims_time); 1596186124Smurray (void)strftime(timebuf, 80, "%a, %d %b %Y %T GMT", 1597186124Smurray timestruct); 1598186124Smurray if (verbose) 1599186124Smurray fetch_info("If-Modified-Since: %s", timebuf); 1600186124Smurray http_cmd(conn, "If-Modified-Since: %s", timebuf); 1601186124Smurray } 160290267Sdes /* virtual host */ 1603174588Sdes http_cmd(conn, "Host: %s", host); 160490267Sdes 1605221821Sdes /* 1606221821Sdes * Proxy authorization: we only send auth after we received 1607221821Sdes * a 407 error. We do not first try basic anyway (changed 1608221821Sdes * when support was added for digest-auth) 1609221821Sdes */ 1610202613Sdes if (purl && proxy_challenges.valid) { 1611202613Sdes http_auth_params_t aparams; 1612202613Sdes init_http_auth_params(&aparams); 1613202613Sdes if (*purl->user || *purl->pwd) { 1614221821Sdes aparams.user = purl->user ? 1615202613Sdes strdup(purl->user) : strdup(""); 1616202613Sdes aparams.password = purl->pwd? 1617202613Sdes strdup(purl->pwd) : strdup(""); 1618221821Sdes } else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL && 1619202613Sdes *p != '\0') { 1620202613Sdes if (http_authfromenv(p, &aparams) < 0) { 1621202613Sdes http_seterr(HTTP_NEED_PROXY_AUTH); 1622202613Sdes goto ouch; 1623202613Sdes } 1624202613Sdes } 1625221821Sdes http_authorize(conn, "Proxy-Authorization", 1626202613Sdes &proxy_challenges, &aparams, url); 1627202613Sdes clean_http_auth_params(&aparams); 162890267Sdes } 162990267Sdes 1630221821Sdes /* 1631221821Sdes * Server authorization: we never send "a priori" 1632202613Sdes * Basic auth, which used to be done if user/pass were 1633202613Sdes * set in the url. This would be weird because we'd send the 1634221821Sdes * password in the clear even if Digest is finally to be 1635202613Sdes * used (it would have made more sense for the 1636221821Sdes * pre-digest version to do this when Basic was specified 1637221821Sdes * in the environment) 1638221821Sdes */ 1639202613Sdes if (server_challenges.valid) { 1640202613Sdes http_auth_params_t aparams; 1641202613Sdes init_http_auth_params(&aparams); 1642202613Sdes if (*url->user || *url->pwd) { 1643221821Sdes aparams.user = url->user ? 1644202613Sdes strdup(url->user) : strdup(""); 1645221821Sdes aparams.password = url->pwd ? 1646202613Sdes strdup(url->pwd) : strdup(""); 1647221821Sdes } else if ((p = getenv("HTTP_AUTH")) != NULL && 1648202613Sdes *p != '\0') { 1649202613Sdes if (http_authfromenv(p, &aparams) < 0) { 1650202613Sdes http_seterr(HTTP_NEED_AUTH); 1651202613Sdes goto ouch; 1652202613Sdes } 1653221821Sdes } else if (fetchAuthMethod && 1654202613Sdes fetchAuthMethod(url) == 0) { 1655221821Sdes aparams.user = url->user ? 1656202613Sdes strdup(url->user) : strdup(""); 1657221821Sdes aparams.password = url->pwd ? 1658202613Sdes strdup(url->pwd) : strdup(""); 165990267Sdes } else { 1660174588Sdes http_seterr(HTTP_NEED_AUTH); 166190267Sdes goto ouch; 166290267Sdes } 1663221821Sdes http_authorize(conn, "Authorization", 1664202613Sdes &server_challenges, &aparams, url); 1665202613Sdes clean_http_auth_params(&aparams); 166690267Sdes } 166790267Sdes 166890267Sdes /* other headers */ 1669256257Sglebius if ((p = getenv("HTTP_ACCEPT")) != NULL) { 1670256257Sglebius if (*p != '\0') 1671256257Sglebius http_cmd(conn, "Accept: %s", p); 1672256257Sglebius } else { 1673256257Sglebius http_cmd(conn, "Accept: */*"); 1674256257Sglebius } 1675107372Sdes if ((p = getenv("HTTP_REFERER")) != NULL && *p != '\0') { 1676107372Sdes if (strcasecmp(p, "auto") == 0) 1677174588Sdes http_cmd(conn, "Referer: %s://%s%s", 1678107372Sdes url->scheme, host, url->doc); 1679107372Sdes else 1680174588Sdes http_cmd(conn, "Referer: %s", p); 1681107372Sdes } 168290267Sdes if ((p = getenv("HTTP_USER_AGENT")) != NULL && *p != '\0') 1683174588Sdes http_cmd(conn, "User-Agent: %s", p); 168490267Sdes else 1685174588Sdes http_cmd(conn, "User-Agent: %s " _LIBFETCH_VER, getprogname()); 1686109693Sdes if (url->offset > 0) 1687174588Sdes http_cmd(conn, "Range: bytes=%lld-", (long long)url->offset); 1688174588Sdes http_cmd(conn, "Connection: close"); 1689174588Sdes http_cmd(conn, ""); 169090267Sdes 1691143049Skbyanc /* 1692143049Skbyanc * Force the queued request to be dispatched. Normally, one 1693143049Skbyanc * would do this with shutdown(2) but squid proxies can be 1694143049Skbyanc * configured to disallow such half-closed connections. To 1695143049Skbyanc * be compatible with such configurations, fiddle with socket 1696143049Skbyanc * options to force the pending data to be written. 1697143049Skbyanc */ 1698143049Skbyanc val = 0; 1699143049Skbyanc setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, 1700143049Skbyanc sizeof(val)); 1701143049Skbyanc val = 1; 1702143049Skbyanc setsockopt(conn->sd, IPPROTO_TCP, TCP_NODELAY, &val, 1703143049Skbyanc sizeof(val)); 1704143049Skbyanc 170590267Sdes /* get reply */ 1706174588Sdes switch (http_get_reply(conn)) { 170790267Sdes case HTTP_OK: 170890267Sdes case HTTP_PARTIAL: 1709186124Smurray case HTTP_NOT_MODIFIED: 171090267Sdes /* fine */ 171190267Sdes break; 171290267Sdes case HTTP_MOVED_PERM: 171390267Sdes case HTTP_MOVED_TEMP: 171490267Sdes case HTTP_SEE_OTHER: 1715242293Seadler case HTTP_USE_PROXY: 171690267Sdes /* 1717125695Sdes * Not so fine, but we still have to read the 1718125695Sdes * headers to get the new location. 171990267Sdes */ 172090267Sdes break; 172190267Sdes case HTTP_NEED_AUTH: 1722202613Sdes if (server_challenges.valid) { 172390267Sdes /* 1724125695Sdes * We already sent out authorization code, 1725125695Sdes * so there's nothing more we can do. 172690267Sdes */ 1727174588Sdes http_seterr(conn->err); 172890267Sdes goto ouch; 172990267Sdes } 173090267Sdes /* try again, but send the password this time */ 173190267Sdes if (verbose) 1732174588Sdes fetch_info("server requires authorization"); 173390267Sdes break; 173490267Sdes case HTTP_NEED_PROXY_AUTH: 1735202613Sdes if (proxy_challenges.valid) { 1736202613Sdes /* 1737202613Sdes * We already sent our proxy 1738202613Sdes * authorization code, so there's 1739202613Sdes * nothing more we can do. */ 1740202613Sdes http_seterr(conn->err); 1741202613Sdes goto ouch; 1742202613Sdes } 1743202613Sdes /* try again, but send the password this time */ 1744202613Sdes if (verbose) 1745202613Sdes fetch_info("proxy requires authorization"); 1746202613Sdes break; 1747125696Sdes case HTTP_BAD_RANGE: 1748125696Sdes /* 1749125696Sdes * This can happen if we ask for 0 bytes because 1750125696Sdes * we already have the whole file. Consider this 1751125696Sdes * a success for now, and check sizes later. 1752125696Sdes */ 1753125696Sdes break; 175490267Sdes case HTTP_PROTOCOL_ERROR: 175590267Sdes /* fall through */ 175690267Sdes case -1: 1757174588Sdes fetch_syserr(); 175890267Sdes goto ouch; 175990267Sdes default: 1760174588Sdes http_seterr(conn->err); 176190267Sdes if (!verbose) 176290267Sdes goto ouch; 176390267Sdes /* fall through so we can get the full error message */ 176490267Sdes } 176590267Sdes 1766202613Sdes /* get headers. http_next_header expects one line readahead */ 1767202613Sdes if (fetch_getln(conn) == -1) { 1768251001Sdes fetch_syserr(); 1769251001Sdes goto ouch; 1770202613Sdes } 177190267Sdes do { 1772251001Sdes switch ((h = http_next_header(conn, &headerbuf, &p))) { 177390267Sdes case hdr_syserror: 1774174588Sdes fetch_syserr(); 177590267Sdes goto ouch; 177690267Sdes case hdr_error: 1777174588Sdes http_seterr(HTTP_PROTOCOL_ERROR); 177890267Sdes goto ouch; 177990267Sdes case hdr_content_length: 1780174588Sdes http_parse_length(p, &clength); 178190267Sdes break; 178290267Sdes case hdr_content_range: 1783174588Sdes http_parse_range(p, &offset, &length, &size); 178490267Sdes break; 178590267Sdes case hdr_last_modified: 1786174588Sdes http_parse_mtime(p, &mtime); 178790267Sdes break; 178890267Sdes case hdr_location: 178997856Sdes if (!HTTP_REDIRECT(conn->err)) 179090267Sdes break; 1791242289Seadler /* 1792242289Seadler * if the A flag is set, we don't follow 1793242289Seadler * temporary redirects. 1794242289Seadler */ 1795242289Seadler if (noredirect && 1796242289Seadler conn->err != HTTP_MOVED_PERM && 1797242293Seadler conn->err != HTTP_PERM_REDIRECT && 1798242293Seadler conn->err != HTTP_USE_PROXY) { 1799242289Seadler n = 1; 1800242289Seadler break; 1801251001Sdes } 180290267Sdes if (new) 180390267Sdes free(new); 180490267Sdes if (verbose) 1805174588Sdes fetch_info("%d redirect to %s", conn->err, p); 180690267Sdes if (*p == '/') 180790267Sdes /* absolute path */ 180890267Sdes new = fetchMakeURL(url->scheme, url->host, url->port, p, 180990267Sdes url->user, url->pwd); 181090267Sdes else 181190267Sdes new = fetchParseURL(p); 181290267Sdes if (new == NULL) { 181390267Sdes /* XXX should set an error code */ 181490267Sdes DEBUG(fprintf(stderr, "failed to parse new URL\n")); 181590267Sdes goto ouch; 181690267Sdes } 1817236108Sdes 1818236108Sdes /* Only copy credentials if the host matches */ 1819236108Sdes if (!strcmp(new->host, url->host) && !*new->user && !*new->pwd) { 182090267Sdes strcpy(new->user, url->user); 182190267Sdes strcpy(new->pwd, url->pwd); 182290267Sdes } 182390267Sdes new->offset = url->offset; 182490267Sdes new->length = url->length; 182590267Sdes break; 182690267Sdes case hdr_transfer_encoding: 182790267Sdes /* XXX weak test*/ 182890267Sdes chunked = (strcasecmp(p, "chunked") == 0); 182990267Sdes break; 183090267Sdes case hdr_www_authenticate: 183197856Sdes if (conn->err != HTTP_NEED_AUTH) 183290267Sdes break; 1833210563Sdes if (http_parse_authenticate(p, &server_challenges) == 0) 1834209632Sdes ++n; 183590267Sdes break; 1836202613Sdes case hdr_proxy_authenticate: 1837202613Sdes if (conn->err != HTTP_NEED_PROXY_AUTH) 1838202613Sdes break; 1839210563Sdes if (http_parse_authenticate(p, &proxy_challenges) == 0) 1840209632Sdes ++n; 1841202613Sdes break; 184290267Sdes case hdr_end: 184390267Sdes /* fall through */ 184490267Sdes case hdr_unknown: 184590267Sdes /* ignore */ 184690267Sdes break; 184790267Sdes } 184890267Sdes } while (h > hdr_end); 184990267Sdes 185090267Sdes /* we need to provide authentication */ 1851221821Sdes if (conn->err == HTTP_NEED_AUTH || 1852202613Sdes conn->err == HTTP_NEED_PROXY_AUTH) { 185398422Sdes e = conn->err; 1854221821Sdes if ((conn->err == HTTP_NEED_AUTH && 1855221821Sdes !server_challenges.valid) || 1856221821Sdes (conn->err == HTTP_NEED_PROXY_AUTH && 1857202613Sdes !proxy_challenges.valid)) { 1858202613Sdes /* 401/7 but no www/proxy-authenticate ?? */ 1859202613Sdes DEBUG(fprintf(stderr, "401/7 and no auth header\n")); 1860202613Sdes goto ouch; 1861202613Sdes } 1862174588Sdes fetch_close(conn); 186397856Sdes conn = NULL; 186490267Sdes continue; 186590267Sdes } 186690267Sdes 1867125696Sdes /* requested range not satisfiable */ 1868125696Sdes if (conn->err == HTTP_BAD_RANGE) { 1869125696Sdes if (url->offset == size && url->length == 0) { 1870125696Sdes /* asked for 0 bytes; fake it */ 1871125696Sdes offset = url->offset; 1872184222Sru clength = -1; 1873125696Sdes conn->err = HTTP_OK; 1874125696Sdes break; 1875125696Sdes } else { 1876174588Sdes http_seterr(conn->err); 1877125696Sdes goto ouch; 1878125696Sdes } 1879125696Sdes } 1880125696Sdes 1881104404Sru /* we have a hit or an error */ 1882186124Smurray if (conn->err == HTTP_OK 1883186124Smurray || conn->err == HTTP_NOT_MODIFIED 1884186124Smurray || conn->err == HTTP_PARTIAL 1885186124Smurray || HTTP_ERROR(conn->err)) 1886104404Sru break; 1887104404Sru 188890267Sdes /* all other cases: we got a redirect */ 188998422Sdes e = conn->err; 1890202613Sdes clean_http_auth_challenges(&server_challenges); 1891174588Sdes fetch_close(conn); 189297856Sdes conn = NULL; 189390267Sdes if (!new) { 189490267Sdes DEBUG(fprintf(stderr, "redirect with no new location\n")); 189590267Sdes break; 189690267Sdes } 189790267Sdes if (url != URL) 189890267Sdes fetchFreeURL(url); 189990267Sdes url = new; 190090267Sdes } while (++i < n); 190190267Sdes 190290267Sdes /* we failed, or ran out of retries */ 190397856Sdes if (conn == NULL) { 1904174588Sdes http_seterr(e); 190563012Sdes goto ouch; 190663012Sdes } 190760376Sdes 190890267Sdes DEBUG(fprintf(stderr, "offset %lld, length %lld," 190990267Sdes " size %lld, clength %lld\n", 191090267Sdes (long long)offset, (long long)length, 191190267Sdes (long long)size, (long long)clength)); 191260376Sdes 1913186124Smurray if (conn->err == HTTP_NOT_MODIFIED) { 1914186124Smurray http_seterr(HTTP_NOT_MODIFIED); 1915186124Smurray return (NULL); 1916186124Smurray } 1917186124Smurray 191890267Sdes /* check for inconsistencies */ 191990267Sdes if (clength != -1 && length != -1 && clength != length) { 1920174588Sdes http_seterr(HTTP_PROTOCOL_ERROR); 192163012Sdes goto ouch; 192263012Sdes } 192390267Sdes if (clength == -1) 192490267Sdes clength = length; 192590267Sdes if (clength != -1) 192690267Sdes length = offset + clength; 192790267Sdes if (length != -1 && size != -1 && length != size) { 1928174588Sdes http_seterr(HTTP_PROTOCOL_ERROR); 192963012Sdes goto ouch; 193090267Sdes } 193190267Sdes if (size == -1) 193290267Sdes size = length; 193360376Sdes 193490267Sdes /* fill in stats */ 193590267Sdes if (us) { 193690267Sdes us->size = size; 193790267Sdes us->atime = us->mtime = mtime; 193890267Sdes } 193963069Sdes 194090267Sdes /* too far? */ 1941109693Sdes if (URL->offset > 0 && offset > URL->offset) { 1942174588Sdes http_seterr(HTTP_PROTOCOL_ERROR); 194390267Sdes goto ouch; 194477238Sdes } 194560376Sdes 194690267Sdes /* report back real offset and size */ 194790267Sdes URL->offset = offset; 194890267Sdes URL->length = clength; 194937535Sdes 195090267Sdes /* wrap it up in a FILE */ 1951174588Sdes if ((f = http_funopen(conn, chunked)) == NULL) { 1952174588Sdes fetch_syserr(); 195390267Sdes goto ouch; 195490267Sdes } 195563716Sdes 195690267Sdes if (url != URL) 195790267Sdes fetchFreeURL(url); 195890267Sdes if (purl) 195990267Sdes fetchFreeURL(purl); 196063567Sdes 196197856Sdes if (HTTP_ERROR(conn->err)) { 1962174588Sdes http_print_html(stderr, f); 196390267Sdes fclose(f); 196490267Sdes f = NULL; 196590267Sdes } 1966202613Sdes clean_http_headerbuf(&headerbuf); 1967202613Sdes clean_http_auth_challenges(&server_challenges); 1968202613Sdes clean_http_auth_challenges(&proxy_challenges); 196990267Sdes return (f); 197088771Sdes 197190267Sdesouch: 197290267Sdes if (url != URL) 197390267Sdes fetchFreeURL(url); 197490267Sdes if (purl) 197590267Sdes fetchFreeURL(purl); 197697856Sdes if (conn != NULL) 1977174588Sdes fetch_close(conn); 1978202613Sdes clean_http_headerbuf(&headerbuf); 1979202613Sdes clean_http_auth_challenges(&server_challenges); 1980202613Sdes clean_http_auth_challenges(&proxy_challenges); 198190267Sdes return (NULL); 198263012Sdes} 198360189Sdes 198490267Sdes 198563012Sdes/***************************************************************************** 198663012Sdes * Entry points 198763012Sdes */ 198863012Sdes 198963012Sdes/* 199063340Sdes * Retrieve and stat a file by HTTP 199163340Sdes */ 199263340SdesFILE * 199375891SarchiefetchXGetHTTP(struct url *URL, struct url_stat *us, const char *flags) 199463340Sdes{ 1995174752Sdes return (http_request(URL, "GET", us, http_get_proxy(URL, flags), flags)); 199663340Sdes} 199763340Sdes 199863340Sdes/* 199963012Sdes * Retrieve a file by HTTP 200063012Sdes */ 200163012SdesFILE * 200275891SarchiefetchGetHTTP(struct url *URL, const char *flags) 200363012Sdes{ 200490267Sdes return (fetchXGetHTTP(URL, NULL, flags)); 200537535Sdes} 200637535Sdes 200763340Sdes/* 200863340Sdes * Store a file by HTTP 200963340Sdes */ 201037535SdesFILE * 201185093SdesfetchPutHTTP(struct url *URL __unused, const char *flags __unused) 201237535Sdes{ 201390267Sdes warnx("fetchPutHTTP(): not implemented"); 201490267Sdes return (NULL); 201537535Sdes} 201640975Sdes 201740975Sdes/* 201840975Sdes * Get an HTTP document's metadata 201940975Sdes */ 202040975Sdesint 202175891SarchiefetchStatHTTP(struct url *URL, struct url_stat *us, const char *flags) 202240975Sdes{ 202390267Sdes FILE *f; 202490267Sdes 2025174752Sdes f = http_request(URL, "HEAD", us, http_get_proxy(URL, flags), flags); 2026112081Sdes if (f == NULL) 202790267Sdes return (-1); 202890267Sdes fclose(f); 202990267Sdes return (0); 203040975Sdes} 203141989Sdes 203241989Sdes/* 203341989Sdes * List a directory 203441989Sdes */ 203541989Sdesstruct url_ent * 203685093SdesfetchListHTTP(struct url *url __unused, const char *flags __unused) 203741989Sdes{ 203890267Sdes warnx("fetchListHTTP(): not implemented"); 203990267Sdes return (NULL); 204041989Sdes} 2041