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/* This software was written by Dirk Engling <erdgeist@erdgeist.org>
It is considered beerware. Prost. Skol. Cheers or whatever. */
/* System */
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <signal.h>
/* Libowfat */
#include "byte.h"
#include "scan.h"
/* Opentracker */
#include "ot_accesslist.h"
/* GLOBAL VARIABLES */
#ifdef WANT_ACCESS_CONTROL
static char *accesslist_filename = NULL;
static ot_vector accesslist;
static char static_inbuf[8192];
static void accesslist_reset( void ) {
free( accesslist.data );
byte_zero( &accesslist, sizeof( accesslist ) );
}
static int accesslist_addentry( ot_hash *infohash ) {
int em;
void *insert = vector_find_or_insert( &accesslist, infohash, OT_HASH_COMPARE_SIZE, OT_HASH_COMPARE_SIZE, &em );
if( !insert )
return -1;
memmove( insert, infohash, OT_HASH_COMPARE_SIZE );
return 0;
}
/* Read initial access list */
static void accesslist_readfile( int foo ) {
FILE * accesslist_filehandle;
ot_hash infohash;
foo = foo;
accesslist_filehandle = fopen( accesslist_filename, "r" );
/* Free accesslist vector in trackerlogic.c*/
accesslist_reset();
if( accesslist_filehandle == NULL ) {
fprintf( stderr, "Warning: Can't open accesslist file: %s (but will try to create it later, if necessary and possible).", accesslist_filename );
return;
}
/* We do ignore anything that is not of the form "^[:xdigit:]{40}[^:xdigit:].*" */
while( fgets( static_inbuf, sizeof(static_inbuf), accesslist_filehandle ) ) {
int i;
for( i=0; i<20; ++i ) {
int eger = 16 * scan_fromhex( static_inbuf[ 2*i ] ) + scan_fromhex( static_inbuf[ 1 + 2*i ] );
if( eger < 0 )
continue;
infohash[i] = eger;
}
if( scan_fromhex( static_inbuf[ 40 ] ) >= 0 )
continue;
/* Append accesslist to accesslist vector */
accesslist_addentry( &infohash );
}
fclose( accesslist_filehandle );
}
int accesslist_hashisvalid( ot_hash *hash ) {
int exactmatch;
binary_search( hash, accesslist.data, accesslist.size, OT_HASH_COMPARE_SIZE, OT_HASH_COMPARE_SIZE, &exactmatch );
#ifdef WANT_BLACKLISTING
exactmatch = !exactmatch;
#endif
return exactmatch;
}
void accesslist_init( char *accesslist_filename_in ) {
byte_zero( &accesslist, sizeof( accesslist ) );
/* Passing "0" since read_blacklist_file also is SIGHUP handler */
if( accesslist_filename_in ) {
accesslist_filename = accesslist_filename_in;
accesslist_readfile( 0 );
signal( SIGHUP, accesslist_readfile );
}
}
#endif
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