mirror of
https://github.com/transmission/transmission
synced 2024-12-25 09:13:06 +00:00
1566 lines
36 KiB
C
1566 lines
36 KiB
C
/*
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* This file Copyright (C) 2008-2009 Charles Kerr <charles@transmissionbt.com>
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*
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* This file is licensed by the GPL version 2. Works owned by the
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* Transmission project are granted a special exemption to clause 2(b)
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* so that the bulk of its code can remain under the MIT license.
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* This exemption does not extend to derived works not owned by
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* the Transmission project.
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*
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* $Id$
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*/
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#include <assert.h>
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#include <ctype.h> /* isdigit, isprint, isspace */
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <locale.h>
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#include <event.h> /* evbuffer */
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#include "ConvertUTF.h"
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#include "transmission.h"
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#include "bencode.h"
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#include "json.h"
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#include "list.h"
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#include "ptrarray.h"
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#include "utils.h" /* tr_new(), tr_free() */
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#ifndef ENODATA
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#define ENODATA EIO
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#endif
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/**
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***
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**/
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static tr_bool
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isContainer( const tr_benc * val )
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{
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return tr_bencIsList( val ) || tr_bencIsDict( val );
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}
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static tr_bool
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isSomething( const tr_benc * val )
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{
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return isContainer( val ) || tr_bencIsInt( val ) || tr_bencIsString( val );
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}
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static void
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tr_bencInit( tr_benc * val,
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int type )
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{
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memset( val, 0, sizeof( *val ) );
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val->type = type;
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}
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/***
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**** tr_bencParse()
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**** tr_bencLoad()
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***/
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/**
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* The initial i and trailing e are beginning and ending delimiters.
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* You can have negative numbers such as i-3e. You cannot prefix the
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* number with a zero such as i04e. However, i0e is valid.
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* Example: i3e represents the integer "3"
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* NOTE: The maximum number of bit of this integer is unspecified,
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* but to handle it as a signed 64bit integer is mandatory to handle
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* "large files" aka .torrent for more that 4Gbyte
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*/
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int
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tr_bencParseInt( const uint8_t * buf,
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const uint8_t * bufend,
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const uint8_t ** setme_end,
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int64_t * setme_val )
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{
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int err = 0;
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char * endptr;
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const void * begin;
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const void * end;
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int64_t val;
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if( buf >= bufend )
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return EILSEQ;
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if( *buf != 'i' )
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return EILSEQ;
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begin = buf + 1;
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end = memchr( begin, 'e', ( bufend - buf ) - 1 );
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if( end == NULL )
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return EILSEQ;
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errno = 0;
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val = evutil_strtoll( begin, &endptr, 10 );
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if( errno || ( endptr != end ) ) /* incomplete parse */
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err = EILSEQ;
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else if( val && *(const char*)begin == '0' ) /* no leading zeroes! */
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err = EILSEQ;
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else
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{
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*setme_end = (const uint8_t*)end + 1;
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*setme_val = val;
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}
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return err;
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}
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/**
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* Byte strings are encoded as follows:
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* <string length encoded in base ten ASCII>:<string data>
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* Note that there is no constant beginning delimiter, and no ending delimiter.
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* Example: 4:spam represents the string "spam"
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*/
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int
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tr_bencParseStr( const uint8_t * buf,
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const uint8_t * bufend,
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const uint8_t ** setme_end,
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const uint8_t ** setme_str,
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size_t * setme_strlen )
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{
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size_t len;
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const void * end;
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char * endptr;
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if( buf >= bufend )
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return EILSEQ;
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if( !isdigit( *buf ) )
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return EILSEQ;
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end = memchr( buf, ':', bufend - buf );
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if( end == NULL )
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return EILSEQ;
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errno = 0;
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len = strtoul( (const char*)buf, &endptr, 10 );
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if( errno || endptr != end )
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return EILSEQ;
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if( (const uint8_t*)end + 1 + len > bufend )
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return EILSEQ;
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*setme_end = (const uint8_t*)end + 1 + len;
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*setme_str = (const uint8_t*)end + 1;
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*setme_strlen = len;
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return 0;
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}
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/* set to 1 to help expose bugs with tr_bencListAdd and tr_bencDictAdd */
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#define LIST_SIZE 8 /* number of items to increment list/dict buffer by */
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static int
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makeroom( tr_benc * val,
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size_t count )
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{
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assert( TYPE_LIST == val->type || TYPE_DICT == val->type );
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if( val->val.l.count + count > val->val.l.alloc )
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{
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/* We need a bigger boat */
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const int len = val->val.l.alloc + count +
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( count % LIST_SIZE ? LIST_SIZE -
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( count % LIST_SIZE ) : 0 );
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void * tmp = realloc( val->val.l.vals, len * sizeof( tr_benc ) );
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if( !tmp )
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return 1;
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val->val.l.alloc = len;
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val->val.l.vals = tmp;
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}
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return 0;
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}
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static tr_benc*
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getNode( tr_benc * top,
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tr_ptrArray * parentStack,
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int type )
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{
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tr_benc * parent;
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assert( top );
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assert( parentStack );
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if( tr_ptrArrayEmpty( parentStack ) )
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return top;
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parent = tr_ptrArrayBack( parentStack );
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assert( parent );
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/* dictionary keys must be strings */
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if( ( parent->type == TYPE_DICT )
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&& ( type != TYPE_STR )
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&& ( !( parent->val.l.count % 2 ) ) )
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return NULL;
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makeroom( parent, 1 );
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return parent->val.l.vals + parent->val.l.count++;
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}
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/**
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* This function's previous recursive implementation was
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* easier to read, but was vulnerable to a smash-stacking
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* attack via maliciously-crafted bencoded data. (#667)
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*/
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static int
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tr_bencParseImpl( const void * buf_in,
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const void * bufend_in,
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tr_benc * top,
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tr_ptrArray * parentStack,
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const uint8_t ** setme_end )
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{
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int err;
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const uint8_t * buf = buf_in;
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const uint8_t * bufend = bufend_in;
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tr_bencInit( top, 0 );
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while( buf != bufend )
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{
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if( buf > bufend ) /* no more text to parse... */
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return 1;
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if( *buf == 'i' ) /* int */
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{
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int64_t val;
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const uint8_t * end;
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tr_benc * node;
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if( ( err = tr_bencParseInt( buf, bufend, &end, &val ) ) )
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return err;
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node = getNode( top, parentStack, TYPE_INT );
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if( !node )
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return EILSEQ;
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tr_bencInitInt( node, val );
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buf = end;
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if( tr_ptrArrayEmpty( parentStack ) )
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break;
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}
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else if( *buf == 'l' ) /* list */
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{
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tr_benc * node = getNode( top, parentStack, TYPE_LIST );
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if( !node )
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return EILSEQ;
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tr_bencInit( node, TYPE_LIST );
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tr_ptrArrayAppend( parentStack, node );
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++buf;
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}
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else if( *buf == 'd' ) /* dict */
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{
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tr_benc * node = getNode( top, parentStack, TYPE_DICT );
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if( !node )
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return EILSEQ;
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tr_bencInit( node, TYPE_DICT );
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tr_ptrArrayAppend( parentStack, node );
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++buf;
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}
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else if( *buf == 'e' ) /* end of list or dict */
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{
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tr_benc * node;
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++buf;
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if( tr_ptrArrayEmpty( parentStack ) )
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return EILSEQ;
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node = tr_ptrArrayBack( parentStack );
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if( tr_bencIsDict( node ) && ( node->val.l.count % 2 ) )
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{
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/* odd # of children in dict */
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tr_bencFree( &node->val.l.vals[--node->val.l.count] );
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return EILSEQ;
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}
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tr_ptrArrayPop( parentStack );
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if( tr_ptrArrayEmpty( parentStack ) )
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break;
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}
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else if( isdigit( *buf ) ) /* string? */
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{
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const uint8_t * end;
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const uint8_t * str;
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size_t str_len;
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tr_benc * node;
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if( ( err = tr_bencParseStr( buf, bufend, &end, &str, &str_len ) ) )
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return err;
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node = getNode( top, parentStack, TYPE_STR );
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if( !node )
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return EILSEQ;
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tr_bencInitStr( node, str, str_len );
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buf = end;
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if( tr_ptrArrayEmpty( parentStack ) )
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break;
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}
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else /* invalid bencoded text... march past it */
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{
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++buf;
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}
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}
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err = !isSomething( top ) || !tr_ptrArrayEmpty( parentStack );
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if( !err && setme_end )
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*setme_end = buf;
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return err;
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}
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int
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tr_bencParse( const void * buf,
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const void * end,
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tr_benc * top,
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const uint8_t ** setme_end )
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{
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int err;
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tr_ptrArray parentStack = TR_PTR_ARRAY_INIT;
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top->type = 0; /* set to `uninitialized' */
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err = tr_bencParseImpl( buf, end, top, &parentStack, setme_end );
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if( err )
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tr_bencFree( top );
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tr_ptrArrayDestruct( &parentStack, NULL );
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return err;
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}
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int
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tr_bencLoad( const void * buf_in,
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size_t buflen,
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tr_benc * setme_benc,
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char ** setme_end )
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{
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const uint8_t * buf = buf_in;
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const uint8_t * end;
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const int ret = tr_bencParse( buf, buf + buflen, setme_benc, &end );
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if( !ret && setme_end )
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*setme_end = (char*) end;
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return ret;
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}
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/***
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****
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***/
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static int
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dictIndexOf( const tr_benc * val,
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const char * key )
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{
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if( tr_bencIsDict( val ) )
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{
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size_t i;
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const size_t len = strlen( key );
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for( i = 0; ( i + 1 ) < val->val.l.count; i += 2 )
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{
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const tr_benc * child = val->val.l.vals + i;
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if( ( child->type == TYPE_STR )
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&& ( child->val.s.i == len )
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&& !memcmp( child->val.s.s, key, len ) )
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return i;
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}
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}
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return -1;
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}
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tr_benc *
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tr_bencDictFind( tr_benc * val, const char * key )
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{
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const int i = dictIndexOf( val, key );
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return i < 0 ? NULL : &val->val.l.vals[i + 1];
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}
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static tr_benc*
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tr_bencDictFindType( tr_benc * val,
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const char * key,
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int type )
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{
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tr_benc * ret = tr_bencDictFind( val, key );
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return ( ret && ( ret->type == type ) ) ? ret : NULL;
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}
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size_t
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tr_bencListSize( const tr_benc * list )
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{
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return tr_bencIsList( list ) ? list->val.l.count : 0;
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}
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tr_benc*
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tr_bencListChild( tr_benc * val,
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size_t i )
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{
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tr_benc * ret = NULL;
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if( tr_bencIsList( val ) && ( i < val->val.l.count ) )
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ret = val->val.l.vals + i;
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return ret;
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}
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tr_bool
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tr_bencGetInt( const tr_benc * val,
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int64_t * setme )
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{
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const tr_bool success = tr_bencIsInt( val );
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if( success && setme )
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*setme = val->val.i;
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return success;
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}
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tr_bool
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tr_bencGetStr( const tr_benc * val,
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const char ** setme )
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{
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const int success = tr_bencIsString( val );
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if( success )
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*setme = val->val.s.s;
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return success;
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}
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tr_bool
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tr_bencGetBool( const tr_benc * val, tr_bool * setme )
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{
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tr_bool success = FALSE;
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if( !success && tr_bencIsInt( val ) )
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if(( success = ( val->val.i==0 || val->val.i==1 ) ))
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*setme = val->val.i!=0;
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if( !success && tr_bencIsString( val ) )
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if(( success = ( !strcmp(val->val.s.s,"true") || !strcmp(val->val.s.s,"false"))))
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*setme = !strcmp(val->val.s.s,"true");
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return success;
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}
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tr_bool
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tr_bencGetReal( const tr_benc * val, double * setme )
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{
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tr_bool success = FALSE;
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if( !success && tr_bencIsString(val) )
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{
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char * endptr;
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char * locale;
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double d;
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/* the json spec requires a '.' decimal point regardless of locale */
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locale = tr_strdup( setlocale ( LC_NUMERIC, NULL ) );
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setlocale( LC_NUMERIC, "POSIX" );
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d = strtod( val->val.s.s, &endptr );
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setlocale( LC_NUMERIC, locale );
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tr_free( locale );
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if(( success = ( val->val.s.s != endptr ) && !*endptr ))
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*setme = d;
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}
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if( !success && tr_bencIsInt(val) )
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{
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success = TRUE;
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*setme = val->val.i;
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}
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return success;
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}
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tr_bool
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tr_bencDictFindInt( tr_benc * dict, const char * key, int64_t * setme )
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{
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return tr_bencGetInt( tr_bencDictFind( dict, key ), setme );
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}
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tr_bool
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tr_bencDictFindBool( tr_benc * dict, const char * key, tr_bool * setme )
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{
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return tr_bencGetBool( tr_bencDictFind( dict, key ), setme );
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}
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tr_bool
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tr_bencDictFindReal( tr_benc * dict, const char * key, double * setme )
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{
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return tr_bencGetReal( tr_bencDictFind( dict, key ), setme );
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}
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tr_bool
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tr_bencDictFindList( tr_benc * dict, const char * key, tr_benc ** setme )
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{
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tr_bool found = FALSE;
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tr_benc * child = tr_bencDictFindType( dict, key, TYPE_LIST );
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if( child )
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{
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if( setme != NULL )
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*setme = child;
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found = TRUE;
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}
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return found;
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}
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tr_bool
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tr_bencDictFindDict( tr_benc * dict, const char * key, tr_benc ** setme )
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{
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tr_bool found = FALSE;
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tr_benc * child = tr_bencDictFindType( dict, key, TYPE_DICT );
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if( child )
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{
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if( setme != NULL )
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*setme = child;
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found = TRUE;
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}
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return found;
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}
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tr_bool
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tr_bencDictFindStr( tr_benc * dict, const char * key, const char ** setme )
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{
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tr_bool found = FALSE;
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tr_benc * child = tr_bencDictFindType( dict, key, TYPE_STR );
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if( child )
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{
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if( setme )
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*setme = child->val.s.s;
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found = TRUE;
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}
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return found;
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}
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tr_bool
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tr_bencDictFindRaw( tr_benc * dict,
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const char * key,
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const uint8_t ** setme_raw,
|
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size_t * setme_len )
|
|
{
|
|
tr_bool found = FALSE;
|
|
tr_benc * child = tr_bencDictFindType( dict, key, TYPE_STR );
|
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|
|
if( child )
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|
{
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*setme_raw = (uint8_t*) child->val.s.s;
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*setme_len = child->val.s.i;
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found = TRUE;
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}
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return found;
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}
|
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|
|
/***
|
|
****
|
|
***/
|
|
|
|
void
|
|
tr_bencInitRaw( tr_benc * val,
|
|
const void * src,
|
|
size_t byteCount )
|
|
{
|
|
tr_bencInit( val, TYPE_STR );
|
|
val->val.s.i = byteCount;
|
|
val->val.s.s = tr_memdup( src, byteCount );
|
|
}
|
|
|
|
void
|
|
tr_bencInitStr( tr_benc * val,
|
|
const void * str,
|
|
int len )
|
|
{
|
|
tr_bencInit( val, TYPE_STR );
|
|
|
|
val->val.s.s = tr_strndup( str, len );
|
|
|
|
if( val->val.s.s == NULL )
|
|
val->val.s.i = 0;
|
|
else if( len < 0 )
|
|
val->val.s.i = strlen( val->val.s.s );
|
|
else
|
|
val->val.s.i = len;
|
|
}
|
|
|
|
void
|
|
tr_bencInitInt( tr_benc * val,
|
|
int64_t num )
|
|
{
|
|
tr_bencInit( val, TYPE_INT );
|
|
val->val.i = num;
|
|
}
|
|
|
|
int
|
|
tr_bencInitList( tr_benc * val,
|
|
size_t reserveCount )
|
|
{
|
|
tr_bencInit( val, TYPE_LIST );
|
|
return tr_bencListReserve( val, reserveCount );
|
|
}
|
|
|
|
int
|
|
tr_bencListReserve( tr_benc * val,
|
|
size_t count )
|
|
{
|
|
assert( tr_bencIsList( val ) );
|
|
return makeroom( val, count );
|
|
}
|
|
|
|
int
|
|
tr_bencInitDict( tr_benc * val,
|
|
size_t reserveCount )
|
|
{
|
|
tr_bencInit( val, TYPE_DICT );
|
|
return tr_bencDictReserve( val, reserveCount );
|
|
}
|
|
|
|
int
|
|
tr_bencDictReserve( tr_benc * val,
|
|
size_t reserveCount )
|
|
{
|
|
assert( tr_bencIsDict( val ) );
|
|
return makeroom( val, reserveCount * 2 );
|
|
}
|
|
|
|
tr_benc *
|
|
tr_bencListAdd( tr_benc * list )
|
|
{
|
|
tr_benc * item;
|
|
|
|
assert( tr_bencIsList( list ) );
|
|
|
|
if( list->val.l.count == list->val.l.alloc )
|
|
tr_bencListReserve( list, LIST_SIZE );
|
|
|
|
assert( list->val.l.count < list->val.l.alloc );
|
|
|
|
item = &list->val.l.vals[list->val.l.count];
|
|
list->val.l.count++;
|
|
tr_bencInit( item, TYPE_INT );
|
|
|
|
return item;
|
|
}
|
|
|
|
tr_benc *
|
|
tr_bencListAddInt( tr_benc * list,
|
|
int64_t val )
|
|
{
|
|
tr_benc * node = tr_bencListAdd( list );
|
|
|
|
tr_bencInitInt( node, val );
|
|
return node;
|
|
}
|
|
|
|
tr_benc *
|
|
tr_bencListAddStr( tr_benc * list,
|
|
const char * val )
|
|
{
|
|
tr_benc * node = tr_bencListAdd( list );
|
|
|
|
tr_bencInitStr( node, val, -1 );
|
|
return node;
|
|
}
|
|
|
|
tr_benc*
|
|
tr_bencListAddList( tr_benc * list,
|
|
size_t reserveCount )
|
|
{
|
|
tr_benc * child = tr_bencListAdd( list );
|
|
|
|
tr_bencInitList( child, reserveCount );
|
|
return child;
|
|
}
|
|
|
|
tr_benc*
|
|
tr_bencListAddDict( tr_benc * list,
|
|
size_t reserveCount )
|
|
{
|
|
tr_benc * child = tr_bencListAdd( list );
|
|
|
|
tr_bencInitDict( child, reserveCount );
|
|
return child;
|
|
}
|
|
|
|
tr_benc *
|
|
tr_bencDictAdd( tr_benc * dict,
|
|
const char * key )
|
|
{
|
|
tr_benc * keyval, * itemval;
|
|
|
|
assert( tr_bencIsDict( dict ) );
|
|
if( dict->val.l.count + 2 > dict->val.l.alloc )
|
|
makeroom( dict, 2 );
|
|
assert( dict->val.l.count + 2 <= dict->val.l.alloc );
|
|
|
|
keyval = dict->val.l.vals + dict->val.l.count++;
|
|
tr_bencInitStr( keyval, key, -1 );
|
|
|
|
itemval = dict->val.l.vals + dict->val.l.count++;
|
|
tr_bencInit( itemval, TYPE_INT );
|
|
|
|
return itemval;
|
|
}
|
|
|
|
tr_benc*
|
|
tr_bencDictAddInt( tr_benc * dict,
|
|
const char * key,
|
|
int64_t val )
|
|
{
|
|
tr_benc * child;
|
|
|
|
/* see if it already exists, and if so, try to reuse it */
|
|
if(( child = tr_bencDictFind( dict, key ))) {
|
|
if( !tr_bencIsInt( child ) ) {
|
|
tr_bencDictRemove( dict, key );
|
|
child = NULL;
|
|
}
|
|
}
|
|
|
|
/* if it doesn't exist, create it */
|
|
if( child == NULL )
|
|
child = tr_bencDictAdd( dict, key );
|
|
|
|
/* set it */
|
|
tr_bencInitInt( child, val );
|
|
|
|
return child;
|
|
}
|
|
|
|
tr_benc*
|
|
tr_bencDictAddBool( tr_benc * dict, const char * key, tr_bool val )
|
|
{
|
|
assert( tr_isBool( val ) );
|
|
|
|
return tr_bencDictAddInt( dict, key, val );
|
|
}
|
|
|
|
tr_benc*
|
|
tr_bencDictAddStr( tr_benc * dict, const char * key, const char * val )
|
|
{
|
|
tr_benc * child;
|
|
|
|
/* see if it already exists, and if so, try to reuse it */
|
|
if(( child = tr_bencDictFind( dict, key ))) {
|
|
if( tr_bencIsString( child ) )
|
|
tr_free( child->val.s.s );
|
|
else {
|
|
tr_bencDictRemove( dict, key );
|
|
child = NULL;
|
|
}
|
|
}
|
|
|
|
/* if it doesn't exist, create it */
|
|
if( child == NULL )
|
|
child = tr_bencDictAdd( dict, key );
|
|
|
|
/* set it */
|
|
tr_bencInitStr( child, val, -1 );
|
|
|
|
return child;
|
|
}
|
|
|
|
tr_benc*
|
|
tr_bencDictAddReal( tr_benc * dict, const char * key, double d )
|
|
{
|
|
char buf[128];
|
|
char * locale;
|
|
|
|
/* the json spec requires a '.' decimal point regardless of locale */
|
|
locale = tr_strdup( setlocale ( LC_NUMERIC, NULL ) );
|
|
setlocale( LC_NUMERIC, "POSIX" );
|
|
tr_snprintf( buf, sizeof( buf ), "%f", d );
|
|
setlocale( LC_NUMERIC, locale );
|
|
tr_free( locale );
|
|
|
|
return tr_bencDictAddStr( dict, key, buf );
|
|
}
|
|
|
|
tr_benc*
|
|
tr_bencDictAddList( tr_benc * dict,
|
|
const char * key,
|
|
size_t reserveCount )
|
|
{
|
|
tr_benc * child = tr_bencDictAdd( dict, key );
|
|
|
|
tr_bencInitList( child, reserveCount );
|
|
return child;
|
|
}
|
|
|
|
tr_benc*
|
|
tr_bencDictAddDict( tr_benc * dict,
|
|
const char * key,
|
|
size_t reserveCount )
|
|
{
|
|
tr_benc * child = tr_bencDictAdd( dict, key );
|
|
|
|
tr_bencInitDict( child, reserveCount );
|
|
return child;
|
|
}
|
|
|
|
tr_benc*
|
|
tr_bencDictAddRaw( tr_benc * dict,
|
|
const char * key,
|
|
const void * src,
|
|
size_t len )
|
|
{
|
|
tr_benc * child = tr_bencDictAdd( dict, key );
|
|
|
|
tr_bencInitRaw( child, src, len );
|
|
return child;
|
|
}
|
|
|
|
int
|
|
tr_bencDictRemove( tr_benc * dict,
|
|
const char * key )
|
|
{
|
|
int i = dictIndexOf( dict, key );
|
|
|
|
if( i >= 0 )
|
|
{
|
|
const int n = dict->val.l.count;
|
|
tr_bencFree( &dict->val.l.vals[i] );
|
|
tr_bencFree( &dict->val.l.vals[i + 1] );
|
|
if( i + 2 < n )
|
|
{
|
|
dict->val.l.vals[i] = dict->val.l.vals[n - 2];
|
|
dict->val.l.vals[i + 1] = dict->val.l.vals[n - 1];
|
|
}
|
|
dict->val.l.count -= 2;
|
|
}
|
|
return i >= 0; /* return true if found */
|
|
}
|
|
|
|
/***
|
|
**** BENC WALKING
|
|
***/
|
|
|
|
struct KeyIndex
|
|
{
|
|
const char * key;
|
|
int index;
|
|
};
|
|
|
|
static int
|
|
compareKeyIndex( const void * va,
|
|
const void * vb )
|
|
{
|
|
const struct KeyIndex * a = va;
|
|
const struct KeyIndex * b = vb;
|
|
|
|
return strcmp( a->key, b->key );
|
|
}
|
|
|
|
struct SaveNode
|
|
{
|
|
const tr_benc * val;
|
|
int valIsVisited;
|
|
int childCount;
|
|
int childIndex;
|
|
int * children;
|
|
};
|
|
|
|
static struct SaveNode*
|
|
nodeNewDict( const tr_benc * val )
|
|
{
|
|
int i, j;
|
|
int nKeys;
|
|
struct SaveNode * node;
|
|
struct KeyIndex * indices;
|
|
|
|
assert( tr_bencIsDict( val ) );
|
|
|
|
nKeys = val->val.l.count / 2;
|
|
node = tr_new0( struct SaveNode, 1 );
|
|
node->val = val;
|
|
node->children = tr_new0( int, nKeys * 2 );
|
|
|
|
/* ugh, a dictionary's children have to be sorted by key... */
|
|
indices = tr_new( struct KeyIndex, nKeys );
|
|
for( i = j = 0; i < ( nKeys * 2 ); i += 2, ++j )
|
|
{
|
|
indices[j].key = val->val.l.vals[i].val.s.s;
|
|
indices[j].index = i;
|
|
}
|
|
qsort( indices, j, sizeof( struct KeyIndex ), compareKeyIndex );
|
|
for( i = 0; i < j; ++i )
|
|
{
|
|
const int index = indices[i].index;
|
|
node->children[node->childCount++] = index;
|
|
node->children[node->childCount++] = index + 1;
|
|
}
|
|
|
|
assert( node->childCount == nKeys * 2 );
|
|
tr_free( indices );
|
|
return node;
|
|
}
|
|
|
|
static struct SaveNode*
|
|
nodeNewList( const tr_benc * val )
|
|
{
|
|
int i, n;
|
|
struct SaveNode * node;
|
|
|
|
assert( tr_bencIsList( val ) );
|
|
|
|
n = val->val.l.count;
|
|
node = tr_new0( struct SaveNode, 1 );
|
|
node->val = val;
|
|
node->childCount = n;
|
|
node->children = tr_new0( int, n );
|
|
for( i = 0; i < n; ++i ) /* a list's children don't need to be reordered */
|
|
node->children[i] = i;
|
|
|
|
return node;
|
|
}
|
|
|
|
static struct SaveNode*
|
|
nodeNewLeaf( const tr_benc * val )
|
|
{
|
|
struct SaveNode * node;
|
|
|
|
assert( !isContainer( val ) );
|
|
|
|
node = tr_new0( struct SaveNode, 1 );
|
|
node->val = val;
|
|
return node;
|
|
}
|
|
|
|
static struct SaveNode*
|
|
nodeNew( const tr_benc * val )
|
|
{
|
|
struct SaveNode * node;
|
|
|
|
if( tr_bencIsList( val ) )
|
|
node = nodeNewList( val );
|
|
else if( tr_bencIsDict( val ) )
|
|
node = nodeNewDict( val );
|
|
else
|
|
node = nodeNewLeaf( val );
|
|
|
|
return node;
|
|
}
|
|
|
|
typedef void ( *BencWalkFunc )( const tr_benc * val, void * user_data );
|
|
|
|
struct WalkFuncs
|
|
{
|
|
BencWalkFunc intFunc;
|
|
BencWalkFunc stringFunc;
|
|
BencWalkFunc dictBeginFunc;
|
|
BencWalkFunc listBeginFunc;
|
|
BencWalkFunc containerEndFunc;
|
|
};
|
|
|
|
/**
|
|
* This function's previous recursive implementation was
|
|
* easier to read, but was vulnerable to a smash-stacking
|
|
* attack via maliciously-crafted bencoded data. (#667)
|
|
*/
|
|
static void
|
|
bencWalk( const tr_benc * top,
|
|
struct WalkFuncs * walkFuncs,
|
|
void * user_data )
|
|
{
|
|
tr_ptrArray stack = TR_PTR_ARRAY_INIT;
|
|
|
|
tr_ptrArrayAppend( &stack, nodeNew( top ) );
|
|
|
|
while( !tr_ptrArrayEmpty( &stack ) )
|
|
{
|
|
struct SaveNode * node = tr_ptrArrayBack( &stack );
|
|
const tr_benc * val;
|
|
|
|
if( !node->valIsVisited )
|
|
{
|
|
val = node->val;
|
|
node->valIsVisited = TRUE;
|
|
}
|
|
else if( node->childIndex < node->childCount )
|
|
{
|
|
const int index = node->children[node->childIndex++];
|
|
val = node->val->val.l.vals + index;
|
|
}
|
|
else /* done with this node */
|
|
{
|
|
if( isContainer( node->val ) )
|
|
walkFuncs->containerEndFunc( node->val, user_data );
|
|
tr_ptrArrayPop( &stack );
|
|
tr_free( node->children );
|
|
tr_free( node );
|
|
continue;
|
|
}
|
|
|
|
if( val ) switch( val->type )
|
|
{
|
|
case TYPE_INT:
|
|
walkFuncs->intFunc( val, user_data );
|
|
break;
|
|
|
|
case TYPE_STR:
|
|
walkFuncs->stringFunc( val, user_data );
|
|
break;
|
|
|
|
case TYPE_LIST:
|
|
if( val != node->val )
|
|
tr_ptrArrayAppend( &stack, nodeNew( val ) );
|
|
else
|
|
walkFuncs->listBeginFunc( val, user_data );
|
|
break;
|
|
|
|
case TYPE_DICT:
|
|
if( val != node->val )
|
|
tr_ptrArrayAppend( &stack, nodeNew( val ) );
|
|
else
|
|
walkFuncs->dictBeginFunc( val, user_data );
|
|
break;
|
|
|
|
default:
|
|
/* did caller give us an uninitialized val? */
|
|
tr_err( _( "Invalid metadata" ) );
|
|
break;
|
|
}
|
|
}
|
|
|
|
tr_ptrArrayDestruct( &stack, NULL );
|
|
}
|
|
|
|
/****
|
|
*****
|
|
****/
|
|
|
|
static void
|
|
saveIntFunc( const tr_benc * val,
|
|
void * evbuf )
|
|
{
|
|
evbuffer_add_printf( evbuf, "i%" PRId64 "e", val->val.i );
|
|
}
|
|
|
|
static void
|
|
saveStringFunc( const tr_benc * val,
|
|
void * vevbuf )
|
|
{
|
|
struct evbuffer * evbuf = vevbuf;
|
|
|
|
evbuffer_add_printf( evbuf, "%lu:", (unsigned long)val->val.s.i );
|
|
evbuffer_add( evbuf, val->val.s.s, val->val.s.i );
|
|
}
|
|
|
|
static void
|
|
saveDictBeginFunc( const tr_benc * val UNUSED,
|
|
void * evbuf )
|
|
{
|
|
evbuffer_add_printf( evbuf, "d" );
|
|
}
|
|
|
|
static void
|
|
saveListBeginFunc( const tr_benc * val UNUSED,
|
|
void * evbuf )
|
|
{
|
|
evbuffer_add_printf( evbuf, "l" );
|
|
}
|
|
|
|
static void
|
|
saveContainerEndFunc( const tr_benc * val UNUSED,
|
|
void * evbuf )
|
|
{
|
|
evbuffer_add_printf( evbuf, "e" );
|
|
}
|
|
|
|
char*
|
|
tr_bencSave( const tr_benc * top,
|
|
int * len )
|
|
{
|
|
char * ret;
|
|
struct WalkFuncs walkFuncs;
|
|
struct evbuffer * out = tr_getBuffer( );
|
|
|
|
walkFuncs.intFunc = saveIntFunc;
|
|
walkFuncs.stringFunc = saveStringFunc;
|
|
walkFuncs.dictBeginFunc = saveDictBeginFunc;
|
|
walkFuncs.listBeginFunc = saveListBeginFunc;
|
|
walkFuncs.containerEndFunc = saveContainerEndFunc;
|
|
bencWalk( top, &walkFuncs, out );
|
|
|
|
if( len )
|
|
*len = EVBUFFER_LENGTH( out );
|
|
ret = tr_strndup( EVBUFFER_DATA( out ), EVBUFFER_LENGTH( out ) );
|
|
|
|
tr_releaseBuffer( out );
|
|
return ret;
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
|
|
static void
|
|
freeDummyFunc( const tr_benc * val UNUSED,
|
|
void * buf UNUSED )
|
|
{}
|
|
|
|
static void
|
|
freeStringFunc( const tr_benc * val,
|
|
void * freeme )
|
|
{
|
|
tr_ptrArrayAppend( freeme, val->val.s.s );
|
|
}
|
|
|
|
static void
|
|
freeContainerBeginFunc( const tr_benc * val,
|
|
void * freeme )
|
|
{
|
|
tr_ptrArrayAppend( freeme, val->val.l.vals );
|
|
}
|
|
|
|
void
|
|
tr_bencFree( tr_benc * val )
|
|
{
|
|
if( val && val->type )
|
|
{
|
|
tr_ptrArray a = TR_PTR_ARRAY_INIT;
|
|
struct WalkFuncs walkFuncs;
|
|
|
|
walkFuncs.intFunc = freeDummyFunc;
|
|
walkFuncs.stringFunc = freeStringFunc;
|
|
walkFuncs.dictBeginFunc = freeContainerBeginFunc;
|
|
walkFuncs.listBeginFunc = freeContainerBeginFunc;
|
|
walkFuncs.containerEndFunc = freeDummyFunc;
|
|
bencWalk( val, &walkFuncs, &a );
|
|
|
|
tr_ptrArrayDestruct( &a, tr_free );
|
|
}
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
|
|
struct ParentState
|
|
{
|
|
int bencType;
|
|
int childIndex;
|
|
int childCount;
|
|
};
|
|
|
|
struct jsonWalk
|
|
{
|
|
tr_list * parents;
|
|
struct evbuffer * out;
|
|
};
|
|
|
|
static void
|
|
jsonIndent( struct jsonWalk * data )
|
|
{
|
|
const int width = tr_list_size( data->parents ) * 4;
|
|
|
|
evbuffer_add_printf( data->out, "\n%*.*s", width, width, " " );
|
|
}
|
|
|
|
static void
|
|
jsonChildFunc( struct jsonWalk * data )
|
|
{
|
|
if( data->parents )
|
|
{
|
|
struct ParentState * parentState = data->parents->data;
|
|
|
|
switch( parentState->bencType )
|
|
{
|
|
case TYPE_DICT:
|
|
{
|
|
const int i = parentState->childIndex++;
|
|
if( !( i % 2 ) )
|
|
evbuffer_add_printf( data->out, ": " );
|
|
else
|
|
{
|
|
evbuffer_add_printf( data->out, ", " );
|
|
jsonIndent( data );
|
|
}
|
|
break;
|
|
}
|
|
|
|
case TYPE_LIST:
|
|
{
|
|
++parentState->childIndex;
|
|
evbuffer_add_printf( data->out, ", " );
|
|
jsonIndent( data );
|
|
break;
|
|
}
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
jsonPushParent( struct jsonWalk * data,
|
|
const tr_benc * benc )
|
|
{
|
|
struct ParentState * parentState = tr_new( struct ParentState, 1 );
|
|
|
|
parentState->bencType = benc->type;
|
|
parentState->childIndex = 0;
|
|
parentState->childCount = benc->val.l.count;
|
|
tr_list_prepend( &data->parents, parentState );
|
|
}
|
|
|
|
static void
|
|
jsonPopParent( struct jsonWalk * data )
|
|
{
|
|
tr_free( tr_list_pop_front( &data->parents ) );
|
|
}
|
|
|
|
static void
|
|
jsonIntFunc( const tr_benc * val,
|
|
void * vdata )
|
|
{
|
|
struct jsonWalk * data = vdata;
|
|
|
|
evbuffer_add_printf( data->out, "%" PRId64, val->val.i );
|
|
jsonChildFunc( data );
|
|
}
|
|
|
|
static void
|
|
jsonStringFunc( const tr_benc * val,
|
|
void * vdata )
|
|
{
|
|
struct jsonWalk * data = vdata;
|
|
const unsigned char *it, *end;
|
|
|
|
evbuffer_add_printf( data->out, "\"" );
|
|
for( it = (const unsigned char*)val->val.s.s, end = it + val->val.s.i;
|
|
it != end; ++it )
|
|
{
|
|
switch( *it )
|
|
{
|
|
case '/':
|
|
evbuffer_add_printf( data->out, "\\/" ); break;
|
|
|
|
case '\b':
|
|
evbuffer_add_printf( data->out, "\\b" ); break;
|
|
|
|
case '\f':
|
|
evbuffer_add_printf( data->out, "\\f" ); break;
|
|
|
|
case '\n':
|
|
evbuffer_add_printf( data->out, "\\n" ); break;
|
|
|
|
case '\r':
|
|
evbuffer_add_printf( data->out, "\\r" ); break;
|
|
|
|
case '\t':
|
|
evbuffer_add_printf( data->out, "\\t" ); break;
|
|
|
|
case '"':
|
|
evbuffer_add_printf( data->out, "\\\"" ); break;
|
|
|
|
case '\\':
|
|
evbuffer_add_printf( data->out, "\\\\" ); break;
|
|
|
|
default:
|
|
if( isascii( *it ) )
|
|
{
|
|
/*fprintf( stderr, "[%c]\n", *it );*/
|
|
evbuffer_add_printf( data->out, "%c", *it );
|
|
}
|
|
else
|
|
{
|
|
const UTF8 * tmp = it;
|
|
UTF32 buf = 0;
|
|
UTF32 * u32 = &buf;
|
|
ConversionResult result = ConvertUTF8toUTF32( &tmp, end, &u32, &buf + 1, 0 );
|
|
if( ( result != conversionOK ) && ( tmp == it ) )
|
|
++it; /* it's beyond help; skip it */
|
|
else {
|
|
evbuffer_add_printf( data->out, "\\u%04x", (unsigned int)buf );
|
|
it = tmp - 1;
|
|
}
|
|
/*fprintf( stderr, "[\\u%04x]\n", buf );*/
|
|
}
|
|
}
|
|
}
|
|
evbuffer_add_printf( data->out, "\"" );
|
|
jsonChildFunc( data );
|
|
}
|
|
|
|
static void
|
|
jsonDictBeginFunc( const tr_benc * val,
|
|
void * vdata )
|
|
{
|
|
struct jsonWalk * data = vdata;
|
|
|
|
jsonPushParent( data, val );
|
|
evbuffer_add_printf( data->out, "{" );
|
|
if( val->val.l.count )
|
|
jsonIndent( data );
|
|
}
|
|
|
|
static void
|
|
jsonListBeginFunc( const tr_benc * val,
|
|
void * vdata )
|
|
{
|
|
const size_t nChildren = tr_bencListSize( val );
|
|
struct jsonWalk * data = vdata;
|
|
|
|
jsonPushParent( data, val );
|
|
evbuffer_add_printf( data->out, "[" );
|
|
if( nChildren )
|
|
jsonIndent( data );
|
|
}
|
|
|
|
static void
|
|
jsonContainerEndFunc( const tr_benc * val,
|
|
void * vdata )
|
|
{
|
|
size_t i;
|
|
struct jsonWalk * data = vdata;
|
|
char * str;
|
|
int emptyContainer = FALSE;
|
|
|
|
/* trim out the trailing comma, if any */
|
|
str = (char*) EVBUFFER_DATA( data->out );
|
|
for( i = EVBUFFER_LENGTH( data->out ) - 1; i > 0; --i )
|
|
{
|
|
if( isspace( str[i] ) ) continue;
|
|
if( str[i] == ',' )
|
|
EVBUFFER_LENGTH( data->out ) = i;
|
|
if( str[i] == '{' || str[i] == '[' )
|
|
emptyContainer = TRUE;
|
|
break;
|
|
}
|
|
|
|
jsonPopParent( data );
|
|
if( !emptyContainer )
|
|
jsonIndent( data );
|
|
if( tr_bencIsDict( val ) )
|
|
evbuffer_add_printf( data->out, "}" );
|
|
else /* list */
|
|
evbuffer_add_printf( data->out, "]" );
|
|
jsonChildFunc( data );
|
|
}
|
|
|
|
char*
|
|
tr_bencSaveAsJSON( const tr_benc * top, struct evbuffer * out )
|
|
{
|
|
struct WalkFuncs walkFuncs;
|
|
struct jsonWalk data;
|
|
|
|
evbuffer_drain( out, EVBUFFER_LENGTH( out ) );
|
|
|
|
data.out = out;
|
|
data.parents = NULL;
|
|
|
|
walkFuncs.intFunc = jsonIntFunc;
|
|
walkFuncs.stringFunc = jsonStringFunc;
|
|
walkFuncs.dictBeginFunc = jsonDictBeginFunc;
|
|
walkFuncs.listBeginFunc = jsonListBeginFunc;
|
|
walkFuncs.containerEndFunc = jsonContainerEndFunc;
|
|
|
|
bencWalk( top, &walkFuncs, &data );
|
|
|
|
if( EVBUFFER_LENGTH( out ) )
|
|
evbuffer_add_printf( out, "\n" );
|
|
|
|
return (char*) EVBUFFER_DATA( out );
|
|
}
|
|
|
|
char*
|
|
tr_bencToJSON( const tr_benc * top )
|
|
{
|
|
char * ret;
|
|
struct evbuffer * buf = evbuffer_new( );
|
|
tr_bencSaveAsJSON( top, buf );
|
|
ret = tr_strndup( EVBUFFER_DATA( buf ), EVBUFFER_LENGTH( buf ) );
|
|
evbuffer_free( buf );
|
|
return ret;
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
|
|
static size_t
|
|
tr_bencDictSize( const tr_benc * dict )
|
|
{
|
|
size_t count = 0;
|
|
|
|
if( tr_bencIsDict( dict ) )
|
|
count = dict->val.l.count / 2;
|
|
|
|
return count;
|
|
}
|
|
|
|
static tr_bool
|
|
tr_bencDictChild( const tr_benc * dict, size_t n, const char ** key, const tr_benc ** val )
|
|
{
|
|
tr_bool success = 0;
|
|
|
|
assert( tr_bencIsDict( dict ) );
|
|
|
|
if( tr_bencIsDict( dict ) && (n*2)+1 <= dict->val.l.count )
|
|
{
|
|
tr_benc * k = dict->val.l.vals + (n*2);
|
|
tr_benc * v = dict->val.l.vals + (n*2) + 1;
|
|
if(( success = tr_bencGetStr( k, key ) && isSomething( v )))
|
|
*val = v;
|
|
}
|
|
|
|
return success;
|
|
}
|
|
|
|
void
|
|
tr_bencMergeDicts( tr_benc * target, const tr_benc * source )
|
|
{
|
|
size_t i;
|
|
const size_t sourceCount = tr_bencDictSize( source );
|
|
|
|
assert( tr_bencIsDict( target ) );
|
|
assert( tr_bencIsDict( source ) );
|
|
|
|
for( i=0; i<sourceCount; ++i )
|
|
{
|
|
const char * key;
|
|
const tr_benc * val;
|
|
|
|
if( tr_bencDictChild( source, i, &key, &val ) )
|
|
{
|
|
int64_t i64;
|
|
const char * str;
|
|
tr_benc * t;
|
|
|
|
if( tr_bencGetInt( val, &i64 ) )
|
|
{
|
|
tr_bencDictRemove( target, key );
|
|
tr_bencDictAddInt( target, key, i64 );
|
|
}
|
|
else if( tr_bencGetStr( val, &str ) )
|
|
{
|
|
tr_bencDictRemove( target, key );
|
|
tr_bencDictAddStr( target, key, str );
|
|
}
|
|
else if( tr_bencIsDict( val ) && tr_bencDictFindDict( target, key, &t ) )
|
|
{
|
|
tr_bencMergeDicts( t, val );
|
|
}
|
|
else
|
|
{
|
|
|
|
tr_dbg( "tr_bencMergeDicts skipping \"%s\"", key );
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
|
|
static int
|
|
saveFile( const char * filename,
|
|
const char * content,
|
|
size_t len )
|
|
{
|
|
int err = 0;
|
|
FILE * out = NULL;
|
|
|
|
out = fopen( filename, "wb+" );
|
|
|
|
if( !out )
|
|
{
|
|
err = errno;
|
|
tr_err( _( "Couldn't open \"%1$s\": %2$s" ),
|
|
filename, tr_strerror( errno ) );
|
|
}
|
|
else if( fwrite( content, sizeof( char ), len, out ) != (size_t)len )
|
|
{
|
|
err = errno;
|
|
tr_err( _( "Couldn't save file \"%1$s\": %2$s" ),
|
|
filename, tr_strerror( errno ) );
|
|
}
|
|
|
|
if( !err )
|
|
tr_dbg( "tr_bencSaveFile saved \"%s\"", filename );
|
|
if( out )
|
|
fclose( out );
|
|
return err;
|
|
}
|
|
|
|
int
|
|
tr_bencSaveFile( const char * filename,
|
|
const tr_benc * b )
|
|
{
|
|
int len;
|
|
char * content = tr_bencSave( b, &len );
|
|
const int err = saveFile( filename, content, len );
|
|
|
|
tr_free( content );
|
|
return err;
|
|
}
|
|
|
|
int
|
|
tr_bencSaveJSONFile( const char * filename,
|
|
const tr_benc * b )
|
|
{
|
|
struct evbuffer * buf = tr_getBuffer( );
|
|
const char * json = tr_bencSaveAsJSON( b, buf );
|
|
const int err = saveFile( filename, json, EVBUFFER_LENGTH( buf ) );
|
|
tr_releaseBuffer( buf );
|
|
return err;
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
|
|
int
|
|
tr_bencLoadFile( const char * filename, tr_benc * b )
|
|
{
|
|
int err;
|
|
size_t contentLen;
|
|
uint8_t * content;
|
|
|
|
content = tr_loadFile( filename, &contentLen );
|
|
if( !content && errno )
|
|
err = errno;
|
|
else if( !content )
|
|
err = ENODATA;
|
|
else
|
|
err = tr_bencLoad( content, contentLen, b, NULL );
|
|
|
|
tr_free( content );
|
|
return err;
|
|
}
|
|
|
|
int
|
|
tr_bencLoadJSONFile( const char * filename, tr_benc * b )
|
|
{
|
|
int err;
|
|
size_t contentLen;
|
|
uint8_t * content;
|
|
|
|
content = tr_loadFile( filename, &contentLen );
|
|
if( !content && errno )
|
|
err = errno;
|
|
else if( !content )
|
|
err = ENODATA;
|
|
else
|
|
err = tr_jsonParse( content, contentLen, b, NULL );
|
|
|
|
tr_free( content );
|
|
return err;
|
|
}
|