mirror of
https://github.com/transmission/transmission
synced 2024-12-27 01:57:52 +00:00
432 lines
9.6 KiB
C
432 lines
9.6 KiB
C
/*
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* This file Copyright (C) Mnemosyne LLC
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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 <stdio.h>
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#include <stdlib.h> /* qsort(), free() */
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#include <string.h>
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#ifdef WIN32
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#include <w32api.h>
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#define WINVER WindowsXP
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#include <windows.h>
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#define PROT_READ PAGE_READONLY
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#define MAP_PRIVATE FILE_MAP_COPY
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#endif
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#ifndef WIN32
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#include <sys/mman.h>
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#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <assert.h>
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#include "transmission.h"
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#include "platform.h"
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#include "blocklist.h"
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#include "net.h"
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#include "utils.h"
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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/***
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**** PRIVATE
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***/
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struct tr_ipv4_range
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{
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uint32_t begin;
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uint32_t end;
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};
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struct tr_blocklist
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{
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tr_bool isEnabled;
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int fd;
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size_t ruleCount;
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size_t byteCount;
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char * filename;
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struct tr_ipv4_range * rules;
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};
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static void
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blocklistClose( tr_blocklist * b )
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{
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if( b->rules )
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{
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munmap( b->rules, b->byteCount );
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close( b->fd );
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b->rules = NULL;
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b->ruleCount = 0;
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b->byteCount = 0;
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b->fd = -1;
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}
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}
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static void
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blocklistLoad( tr_blocklist * b )
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{
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int fd;
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size_t byteCount;
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struct stat st;
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const char * err_fmt = _( "Couldn't read \"%1$s\": %2$s" );
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blocklistClose( b );
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if( stat( b->filename, &st ) == -1 )
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return;
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fd = open( b->filename, O_RDONLY | O_BINARY );
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if( fd == -1 )
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{
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tr_err( err_fmt, b->filename, tr_strerror( errno ) );
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return;
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}
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byteCount = (size_t) st.st_size;
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b->rules = mmap( NULL, byteCount, PROT_READ, MAP_PRIVATE, fd, 0 );
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if( !b->rules )
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{
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tr_err( err_fmt, b->filename, tr_strerror( errno ) );
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close( fd );
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return;
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}
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b->fd = fd;
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b->byteCount = byteCount;
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b->ruleCount = byteCount / sizeof( struct tr_ipv4_range );
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{
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char * base = tr_basename( b->filename );
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tr_inf( _( "Blocklist \"%s\" contains %zu entries" ), base, b->ruleCount );
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tr_free( base );
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}
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}
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static void
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blocklistEnsureLoaded( tr_blocklist * b )
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{
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if( !b->rules )
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blocklistLoad( b );
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}
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static int
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compareAddressToRange( const void * va,
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const void * vb )
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{
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const uint32_t * a = va;
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const struct tr_ipv4_range * b = vb;
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if( *a < b->begin ) return -1;
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if( *a > b->end ) return 1;
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return 0;
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}
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static void
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blocklistDelete( tr_blocklist * b )
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{
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blocklistClose( b );
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unlink( b->filename );
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}
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/***
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**** PACKAGE-VISIBLE
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***/
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tr_blocklist *
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_tr_blocklistNew( const char * filename, tr_bool isEnabled )
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{
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tr_blocklist * b;
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b = tr_new0( tr_blocklist, 1 );
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b->fd = -1;
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b->filename = tr_strdup( filename );
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b->isEnabled = isEnabled;
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return b;
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}
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const char*
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_tr_blocklistGetFilename( const tr_blocklist * b )
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{
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return b->filename;
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}
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void
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_tr_blocklistFree( tr_blocklist * b )
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{
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blocklistClose( b );
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tr_free( b->filename );
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tr_free( b );
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}
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int
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_tr_blocklistExists( const tr_blocklist * b )
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{
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struct stat st;
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return !stat( b->filename, &st );
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}
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int
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_tr_blocklistGetRuleCount( const tr_blocklist * b )
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{
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blocklistEnsureLoaded( (tr_blocklist*)b );
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return b->ruleCount;
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}
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int
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_tr_blocklistIsEnabled( tr_blocklist * b )
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{
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return b->isEnabled;
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}
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void
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_tr_blocklistSetEnabled( tr_blocklist * b,
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int isEnabled )
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{
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b->isEnabled = isEnabled ? 1 : 0;
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}
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int
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_tr_blocklistHasAddress( tr_blocklist * b,
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const tr_address * addr )
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{
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uint32_t needle;
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const struct tr_ipv4_range * range;
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assert( tr_isAddress( addr ) );
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if( !b->isEnabled || addr->type == TR_AF_INET6 )
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return 0;
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blocklistEnsureLoaded( b );
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if( !b->rules || !b->ruleCount )
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return 0;
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needle = ntohl( addr->addr.addr4.s_addr );
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range = bsearch( &needle,
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b->rules,
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b->ruleCount,
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sizeof( struct tr_ipv4_range ),
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compareAddressToRange );
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return range != NULL;
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}
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/*
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* P2P plaintext format: "comment:x.x.x.x-y.y.y.y"
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* http://wiki.phoenixlabs.org/wiki/P2P_Format
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* http://en.wikipedia.org/wiki/PeerGuardian#P2P_plaintext_format
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*/
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static tr_bool
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parseLine1( const char * line, struct tr_ipv4_range * range )
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{
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char * walk;
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int b[4];
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int e[4];
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char str[64];
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tr_address addr;
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walk = strrchr( line, ':' );
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if( !walk )
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return FALSE;
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++walk; /* walk past the colon */
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if( sscanf( walk, "%d.%d.%d.%d-%d.%d.%d.%d",
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&b[0], &b[1], &b[2], &b[3],
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&e[0], &e[1], &e[2], &e[3] ) != 8 )
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return FALSE;
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tr_snprintf( str, sizeof( str ), "%d.%d.%d.%d", b[0], b[1], b[2], b[3] );
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if( tr_pton( str, &addr ) == NULL )
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return FALSE;
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range->begin = ntohl( addr.addr.addr4.s_addr );
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tr_snprintf( str, sizeof( str ), "%d.%d.%d.%d", e[0], e[1], e[2], e[3] );
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if( tr_pton( str, &addr ) == NULL )
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return FALSE;
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range->end = ntohl( addr.addr.addr4.s_addr );
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return TRUE;
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}
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/*
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* DAT format: "000.000.000.000 - 000.255.255.255 , 000 , invalid ip"
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* http://wiki.phoenixlabs.org/wiki/DAT_Format
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*/
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static tr_bool
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parseLine2( const char * line, struct tr_ipv4_range * range )
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{
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int unk;
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int a[4];
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int b[4];
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char str[32];
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tr_address addr;
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if( sscanf( line, "%3d.%3d.%3d.%3d - %3d.%3d.%3d.%3d , %3d , ",
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&a[0], &a[1], &a[2], &a[3],
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&b[0], &b[1], &b[2], &b[3],
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&unk ) != 9 )
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return FALSE;
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tr_snprintf( str, sizeof(str), "%d.%d.%d.%d", a[0], a[1], a[2], a[3] );
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if( tr_pton( str, &addr ) == NULL )
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return FALSE;
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range->begin = ntohl( addr.addr.addr4.s_addr );
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tr_snprintf( str, sizeof(str), "%d.%d.%d.%d", b[0], b[1], b[2], b[3] );
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if( tr_pton( str, &addr ) == NULL )
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return FALSE;
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range->end = ntohl( addr.addr.addr4.s_addr );
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return TRUE;
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}
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static int
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parseLine( const char * line, struct tr_ipv4_range * range )
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{
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return parseLine1( line, range )
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|| parseLine2( line, range );
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}
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static int
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compareAddressRangesByFirstAddress( const void * va, const void * vb )
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{
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const struct tr_ipv4_range * a = va;
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const struct tr_ipv4_range * b = vb;
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if( a->begin != b->begin )
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return a->begin < b->begin ? -1 : 1;
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return 0;
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}
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int
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_tr_blocklistSetContent( tr_blocklist * b, const char * filename )
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{
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FILE * in;
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FILE * out;
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int inCount = 0;
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char line[2048];
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const char * err_fmt = _( "Couldn't read \"%1$s\": %2$s" );
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struct tr_ipv4_range * ranges = NULL;
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size_t ranges_alloc = 0;
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size_t ranges_count = 0;
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if( !filename )
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{
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blocklistDelete( b );
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return 0;
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}
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in = fopen( filename, "rb" );
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if( !in )
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{
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tr_err( err_fmt, filename, tr_strerror( errno ) );
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return 0;
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}
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blocklistClose( b );
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out = fopen( b->filename, "wb+" );
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if( !out )
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{
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tr_err( err_fmt, b->filename, tr_strerror( errno ) );
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fclose( in );
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return 0;
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}
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/* load the rules into memory */
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while( fgets( line, sizeof( line ), in ) != NULL )
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{
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char * walk;
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struct tr_ipv4_range range;
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++inCount;
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/* zap the linefeed */
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if(( walk = strchr( line, '\r' ))) *walk = '\0';
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if(( walk = strchr( line, '\n' ))) *walk = '\0';
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if( !parseLine( line, &range ) )
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{
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/* don't try to display the actual lines - it causes issues */
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tr_err( _( "blocklist skipped invalid address at line %d" ), inCount );
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continue;
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}
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if( ranges_alloc == ranges_count )
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{
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ranges_alloc += 4096; /* arbitrary */
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ranges = tr_renew( struct tr_ipv4_range, ranges, ranges_alloc );
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}
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ranges[ranges_count++] = range;
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}
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if( ranges_count > 0 ) /* sort and merge */
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{
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struct tr_ipv4_range * r;
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struct tr_ipv4_range * keep = ranges;
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const struct tr_ipv4_range * end;
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/* sort */
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qsort( ranges, ranges_count, sizeof( struct tr_ipv4_range ),
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compareAddressRangesByFirstAddress );
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/* merge */
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for( r=ranges+1, end=ranges+ranges_count; r!=end; ++r ) {
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if( keep->end < r->begin )
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*++keep = *r;
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else if( keep->end < r->end )
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keep->end = r->end;
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}
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ranges_count = keep + 1 - ranges;
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#ifndef NDEBUG
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/* sanity checks: make sure the rules are sorted
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* in ascending order and don't overlap */
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{
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size_t i;
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for( i=0; i<ranges_count; ++i )
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assert( ranges[i].begin <= ranges[i].end );
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for( i=1; i<ranges_count; ++i )
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assert( ranges[i-1].end < ranges[i].begin );
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}
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#endif
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}
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if( fwrite( ranges, sizeof( struct tr_ipv4_range ), ranges_count, out ) != ranges_count )
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tr_err( _( "Couldn't save file \"%1$s\": %2$s" ), b->filename, tr_strerror( errno ) );
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else {
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char * base = tr_basename( b->filename );
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tr_inf( _( "Blocklist \"%s\" updated with %zu entries" ), base, ranges_count );
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tr_free( base );
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}
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tr_free( ranges );
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fclose( out );
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fclose( in );
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blocklistLoad( b );
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return ranges_count;
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}
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