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transmission/libtransmission/blocklist.c

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/*
* This file Copyright (C) Mnemosyne LLC
*
* This file is licensed by the GPL version 2. Works owned by the
* Transmission project are granted a special exemption to clause 2(b)
* so that the bulk of its code can remain under the MIT license.
* This exemption does not extend to derived works not owned by
* the Transmission project.
*
* $Id$
*/
#include <stdio.h>
#include <stdlib.h> /* qsort(), free() */
#include <string.h>
#ifdef WIN32
#include <w32api.h>
#define WINVER WindowsXP
#include <windows.h>
#define PROT_READ PAGE_READONLY
#define MAP_PRIVATE FILE_MAP_COPY
#endif
#ifndef WIN32
#include <sys/mman.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <assert.h>
#include "transmission.h"
#include "platform.h"
#include "blocklist.h"
#include "net.h"
#include "utils.h"
#ifndef O_BINARY
#define O_BINARY 0
#endif
/***
**** PRIVATE
***/
struct tr_ipv4_range
{
uint32_t begin;
uint32_t end;
};
struct tr_blocklist
{
tr_bool isEnabled;
int fd;
size_t ruleCount;
size_t byteCount;
char * filename;
struct tr_ipv4_range * rules;
};
static void
blocklistClose( tr_blocklist * b )
{
if( b->rules )
{
munmap( b->rules, b->byteCount );
close( b->fd );
b->rules = NULL;
b->ruleCount = 0;
b->byteCount = 0;
b->fd = -1;
}
}
static void
blocklistLoad( tr_blocklist * b )
{
int fd;
size_t byteCount;
struct stat st;
const char * err_fmt = _( "Couldn't read \"%1$s\": %2$s" );
blocklistClose( b );
if( stat( b->filename, &st ) == -1 )
return;
fd = open( b->filename, O_RDONLY | O_BINARY );
if( fd == -1 )
{
tr_err( err_fmt, b->filename, tr_strerror( errno ) );
return;
}
byteCount = (size_t) st.st_size;
b->rules = mmap( NULL, byteCount, PROT_READ, MAP_PRIVATE, fd, 0 );
if( !b->rules )
{
tr_err( err_fmt, b->filename, tr_strerror( errno ) );
close( fd );
return;
}
b->fd = fd;
b->byteCount = byteCount;
b->ruleCount = byteCount / sizeof( struct tr_ipv4_range );
{
char * base = tr_basename( b->filename );
tr_inf( _( "Blocklist \"%s\" contains %zu entries" ), base, b->ruleCount );
tr_free( base );
}
}
static void
blocklistEnsureLoaded( tr_blocklist * b )
{
if( !b->rules )
blocklistLoad( b );
}
static int
compareAddressToRange( const void * va,
const void * vb )
{
const uint32_t * a = va;
const struct tr_ipv4_range * b = vb;
if( *a < b->begin ) return -1;
if( *a > b->end ) return 1;
return 0;
}
static void
blocklistDelete( tr_blocklist * b )
{
blocklistClose( b );
unlink( b->filename );
}
/***
**** PACKAGE-VISIBLE
***/
tr_blocklist *
_tr_blocklistNew( const char * filename, tr_bool isEnabled )
{
tr_blocklist * b;
b = tr_new0( tr_blocklist, 1 );
b->fd = -1;
b->filename = tr_strdup( filename );
b->isEnabled = isEnabled;
return b;
}
const char*
_tr_blocklistGetFilename( const tr_blocklist * b )
{
return b->filename;
}
void
_tr_blocklistFree( tr_blocklist * b )
{
blocklistClose( b );
tr_free( b->filename );
tr_free( b );
}
int
_tr_blocklistExists( const tr_blocklist * b )
{
struct stat st;
return !stat( b->filename, &st );
}
int
_tr_blocklistGetRuleCount( const tr_blocklist * b )
{
blocklistEnsureLoaded( (tr_blocklist*)b );
return b->ruleCount;
}
int
_tr_blocklistIsEnabled( tr_blocklist * b )
{
return b->isEnabled;
}
void
_tr_blocklistSetEnabled( tr_blocklist * b,
int isEnabled )
{
b->isEnabled = isEnabled ? 1 : 0;
}
int
_tr_blocklistHasAddress( tr_blocklist * b,
const tr_address * addr )
{
uint32_t needle;
const struct tr_ipv4_range * range;
assert( tr_isAddress( addr ) );
if( !b->isEnabled || addr->type == TR_AF_INET6 )
return 0;
blocklistEnsureLoaded( b );
if( !b->rules || !b->ruleCount )
return 0;
needle = ntohl( addr->addr.addr4.s_addr );
range = bsearch( &needle,
b->rules,
b->ruleCount,
sizeof( struct tr_ipv4_range ),
compareAddressToRange );
return range != NULL;
}
/*
* P2P plaintext format: "comment:x.x.x.x-y.y.y.y"
* http://wiki.phoenixlabs.org/wiki/P2P_Format
* http://en.wikipedia.org/wiki/PeerGuardian#P2P_plaintext_format
*/
static tr_bool
parseLine1( const char * line, struct tr_ipv4_range * range )
{
char * walk;
int b[4];
int e[4];
char str[64];
tr_address addr;
walk = strrchr( line, ':' );
if( !walk )
return FALSE;
++walk; /* walk past the colon */
if( sscanf( walk, "%d.%d.%d.%d-%d.%d.%d.%d",
&b[0], &b[1], &b[2], &b[3],
&e[0], &e[1], &e[2], &e[3] ) != 8 )
return FALSE;
tr_snprintf( str, sizeof( str ), "%d.%d.%d.%d", b[0], b[1], b[2], b[3] );
if( tr_pton( str, &addr ) == NULL )
return FALSE;
range->begin = ntohl( addr.addr.addr4.s_addr );
tr_snprintf( str, sizeof( str ), "%d.%d.%d.%d", e[0], e[1], e[2], e[3] );
if( tr_pton( str, &addr ) == NULL )
return FALSE;
range->end = ntohl( addr.addr.addr4.s_addr );
return TRUE;
}
/*
* DAT format: "000.000.000.000 - 000.255.255.255 , 000 , invalid ip"
* http://wiki.phoenixlabs.org/wiki/DAT_Format
*/
static tr_bool
parseLine2( const char * line, struct tr_ipv4_range * range )
{
int unk;
int a[4];
int b[4];
char str[32];
tr_address addr;
if( sscanf( line, "%3d.%3d.%3d.%3d - %3d.%3d.%3d.%3d , %3d , ",
&a[0], &a[1], &a[2], &a[3],
&b[0], &b[1], &b[2], &b[3],
&unk ) != 9 )
return FALSE;
tr_snprintf( str, sizeof(str), "%d.%d.%d.%d", a[0], a[1], a[2], a[3] );
if( tr_pton( str, &addr ) == NULL )
return FALSE;
range->begin = ntohl( addr.addr.addr4.s_addr );
tr_snprintf( str, sizeof(str), "%d.%d.%d.%d", b[0], b[1], b[2], b[3] );
if( tr_pton( str, &addr ) == NULL )
return FALSE;
range->end = ntohl( addr.addr.addr4.s_addr );
return TRUE;
}
static int
parseLine( const char * line, struct tr_ipv4_range * range )
{
return parseLine1( line, range )
|| parseLine2( line, range );
}
static int
compareAddressRangesByFirstAddress( const void * va, const void * vb )
{
const struct tr_ipv4_range * a = va;
const struct tr_ipv4_range * b = vb;
if( a->begin != b->begin )
return a->begin < b->begin ? -1 : 1;
return 0;
}
int
_tr_blocklistSetContent( tr_blocklist * b, const char * filename )
{
FILE * in;
FILE * out;
int inCount = 0;
char line[2048];
const char * err_fmt = _( "Couldn't read \"%1$s\": %2$s" );
struct tr_ipv4_range * ranges = NULL;
size_t ranges_alloc = 0;
size_t ranges_count = 0;
if( !filename )
{
blocklistDelete( b );
return 0;
}
in = fopen( filename, "rb" );
if( !in )
{
tr_err( err_fmt, filename, tr_strerror( errno ) );
return 0;
}
blocklistClose( b );
out = fopen( b->filename, "wb+" );
if( !out )
{
tr_err( err_fmt, b->filename, tr_strerror( errno ) );
fclose( in );
return 0;
}
/* load the rules into memory */
while( fgets( line, sizeof( line ), in ) != NULL )
{
char * walk;
struct tr_ipv4_range range;
++inCount;
/* zap the linefeed */
if(( walk = strchr( line, '\r' ))) *walk = '\0';
if(( walk = strchr( line, '\n' ))) *walk = '\0';
if( !parseLine( line, &range ) )
{
/* don't try to display the actual lines - it causes issues */
tr_err( _( "blocklist skipped invalid address at line %d" ), inCount );
continue;
}
if( ranges_alloc == ranges_count )
{
ranges_alloc += 4096; /* arbitrary */
ranges = tr_renew( struct tr_ipv4_range, ranges, ranges_alloc );
}
ranges[ranges_count++] = range;
}
if( ranges_count > 0 ) /* sort and merge */
{
struct tr_ipv4_range * r;
struct tr_ipv4_range * keep = ranges;
const struct tr_ipv4_range * end;
/* sort */
qsort( ranges, ranges_count, sizeof( struct tr_ipv4_range ),
compareAddressRangesByFirstAddress );
/* merge */
for( r=ranges+1, end=ranges+ranges_count; r!=end; ++r ) {
if( keep->end < r->begin )
*++keep = *r;
else if( keep->end < r->end )
keep->end = r->end;
}
ranges_count = keep + 1 - ranges;
#ifndef NDEBUG
/* sanity checks: make sure the rules are sorted
* in ascending order and don't overlap */
{
size_t i;
for( i=0; i<ranges_count; ++i )
assert( ranges[i].begin <= ranges[i].end );
for( i=1; i<ranges_count; ++i )
assert( ranges[i-1].end < ranges[i].begin );
}
#endif
}
if( fwrite( ranges, sizeof( struct tr_ipv4_range ), ranges_count, out ) != ranges_count )
tr_err( _( "Couldn't save file \"%1$s\": %2$s" ), b->filename, tr_strerror( errno ) );
else {
char * base = tr_basename( b->filename );
tr_inf( _( "Blocklist \"%s\" updated with %zu entries" ), base, ranges_count );
tr_free( base );
}
tr_free( ranges );
fclose( out );
fclose( in );
blocklistLoad( b );
return ranges_count;
}
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