235 lines
7.0 KiB
C
235 lines
7.0 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 <assert.h>
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#include <string.h> /* strchr() */
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#include <stdio.h> /* sscanf() */
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#include "transmission.h"
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#include "bencode.h"
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#include "magnet.h"
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#include "utils.h"
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#include "web.h"
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/***
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****
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***/
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/* this base32 code converted from code by Robert Kaye and Gordon Mohr
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* and is public domain. see http://bitzi.com/publicdomain for more info */
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static const int base32Lookup[] =
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{
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0xFF,0xFF,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F, /* '0', '1', '2', '3', '4', '5', '6', '7' */
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0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, /* '8', '9', ':', ';', '<', '=', '>', '?' */
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0xFF,0x00,0x01,0x02,0x03,0x04,0x05,0x06, /* '@', 'A', 'B', 'C', 'D', 'E', 'F', 'G' */
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0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E, /* 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O' */
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0x0F,0x10,0x11,0x12,0x13,0x14,0x15,0x16, /* 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W' */
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0x17,0x18,0x19,0xFF,0xFF,0xFF,0xFF,0xFF, /* 'X', 'Y', 'Z', '[', '\', ']', '^', '_' */
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0xFF,0x00,0x01,0x02,0x03,0x04,0x05,0x06, /* '`', 'a', 'b', 'c', 'd', 'e', 'f', 'g' */
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0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E, /* 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o' */
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0x0F,0x10,0x11,0x12,0x13,0x14,0x15,0x16, /* 'p', 'q', 'r', 's', 't', 'u', 'v', 'w' */
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0x17,0x18,0x19,0xFF,0xFF,0xFF,0xFF,0xFF /* 'x', 'y', 'z', '{', '|', '}', '~', 'DEL' */
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};
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static const int base32LookupLen = sizeof( base32Lookup ) / sizeof( base32Lookup[0] );
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static void
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base32_to_sha1( uint8_t * out, const char * in, const int inlen )
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{
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const int outlen = 20;
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int i, index, offset;
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memset( out, 0, 20 );
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assert( inlen == 32 );
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for( i=0, index=0, offset=0; i<inlen; ++i )
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{
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int digit;
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int lookup = in[i] - '0';
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/* Skip chars outside the lookup table */
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if( lookup<0 || lookup>=base32LookupLen )
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continue;
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/* If this digit is not in the table, ignore it */
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digit = base32Lookup[lookup];
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if( digit == 0xFF )
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continue;
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if( index <= 3 ) {
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index = (index + 5) % 8;
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if( index == 0 ) {
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out[offset] |= digit;
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offset++;
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if( offset >= outlen )
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break;
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} else {
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out[offset] |= digit << (8 - index);
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}
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} else {
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index = (index + 5) % 8;
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out[offset] |= (digit >> index);
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offset++;
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if( offset >= outlen )
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break;
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out[offset] |= digit << (8 - index);
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}
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}
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}
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/***
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****
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***/
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#define MAX_TRACKERS 64
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#define MAX_WEBSEEDS 64
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tr_magnet_info *
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tr_magnetParse( const char * uri )
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{
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bool got_checksum = false;
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int trCount = 0;
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int wsCount = 0;
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char * tr[MAX_TRACKERS];
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char * ws[MAX_WEBSEEDS];
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char * displayName = NULL;
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uint8_t sha1[SHA_DIGEST_LENGTH];
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tr_magnet_info * info = NULL;
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if( ( uri != NULL ) && !memcmp( uri, "magnet:?", 8 ) )
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{
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const char * walk;
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for( walk=uri+8; walk && *walk; )
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{
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const char * key = walk;
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const char * delim = strchr( key, '=' );
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const char * val = delim == NULL ? NULL : delim + 1;
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const char * next = strchr( delim == NULL ? key : val, '&' );
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int keylen, vallen;
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if( delim != NULL )
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keylen = delim - key;
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else if( next != NULL )
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keylen = next - key;
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else
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keylen = strlen( key );
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if( val == NULL )
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vallen = 0;
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else if( next != NULL )
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vallen = next - val;
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else
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vallen = strlen( val );
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if( ( keylen==2 ) && !memcmp( key, "xt", 2 ) && val && !memcmp( val, "urn:btih:", 9 ) )
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{
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const char * hash = val + 9;
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const int hashlen = vallen - 9;
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if( hashlen == 40 ) {
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tr_hex_to_sha1( sha1, hash );
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got_checksum = true;
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}
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else if( hashlen == 32 ) {
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base32_to_sha1( sha1, hash, hashlen );
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got_checksum = true;
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}
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}
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if( ( vallen > 0 ) && ( keylen==2 ) && !memcmp( key, "dn", 2 ) )
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displayName = tr_http_unescape( val, vallen );
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if( ( vallen > 0 ) && ( trCount < MAX_TRACKERS ) ) {
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int i;
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if( ( keylen==2 ) && !memcmp( key, "tr", 2 ) )
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tr[trCount++] = tr_http_unescape( val, vallen );
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else if( ( sscanf( key, "tr.%d=", &i ) == 1 ) && ( i > 0 ) ) /* ticket #3341 */
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tr[trCount++] = tr_http_unescape( val, vallen );
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}
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if( ( vallen > 0 ) && ( keylen==2 ) && !memcmp( key, "ws", 2 ) && ( wsCount < MAX_WEBSEEDS ) )
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ws[wsCount++] = tr_http_unescape( val, vallen );
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walk = next != NULL ? next + 1 : NULL;
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}
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}
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if( got_checksum )
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{
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info = tr_new0( tr_magnet_info, 1 );
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info->displayName = displayName;
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info->trackerCount = trCount;
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info->trackers = tr_memdup( tr, sizeof(char*) * trCount );
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info->webseedCount = wsCount;
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info->webseeds = tr_memdup( ws, sizeof(char*) * wsCount );
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memcpy( info->hash, sha1, sizeof(uint8_t) * SHA_DIGEST_LENGTH );
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}
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return info;
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}
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void
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tr_magnetFree( tr_magnet_info * info )
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{
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if( info != NULL )
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{
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int i;
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for( i=0; i<info->trackerCount; ++i )
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tr_free( info->trackers[i] );
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tr_free( info->trackers );
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for( i=0; i<info->webseedCount; ++i )
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tr_free( info->webseeds[i] );
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tr_free( info->webseeds );
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tr_free( info->displayName );
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tr_free( info );
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}
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}
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void
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tr_magnetCreateMetainfo( const tr_magnet_info * info, tr_benc * top )
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{
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int i;
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tr_benc * d;
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tr_bencInitDict( top, 4 );
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/* announce list */
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if( info->trackerCount == 1 )
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tr_bencDictAddStr( top, "announce", info->trackers[0] );
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else {
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tr_benc * trackers = tr_bencDictAddList( top, "announce-list", info->trackerCount );
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for( i=0; i<info->trackerCount; ++i )
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tr_bencListAddStr( tr_bencListAddList( trackers, 1 ), info->trackers[i] );
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}
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/* webseeds */
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if( info->webseedCount > 0 ) {
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tr_benc * urls = tr_bencDictAddList( top, "url-list", info->webseedCount );
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for( i=0; i<info->webseedCount; ++i )
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tr_bencListAddStr( urls, info->webseeds[i] );
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}
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/* nonstandard keys */
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d = tr_bencDictAddDict( top, "magnet-info", 2 );
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tr_bencDictAddRaw( d, "info_hash", info->hash, 20 );
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if( info->displayName != NULL )
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tr_bencDictAddStr( d, "display-name", info->displayName );
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}
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