7 #define BUFFER_SIZE 8192
9 #define SLIP_ESCAPE_CHAR ( (char) 0xDB)
10 #define SLIP_PACKET ( (char) 0xC0)
12 char hexDigit( char c ) {
28 std::string toHex( const char* buf, int len ) {
29 std::string data = "000000";
31 for( int i = 0; i < len; i++ ) {
32 data.append( 1, ' ' );
33 data.append( 1, hexDigit( ( buf[i] >> 4 ) & 0xF ) );
34 data.append( 1, hexDigit( buf[i] & 0xF ) );
40 SlipBIO::SlipBIO() : buffer( std::vector<char>( BUFFER_SIZE ) ), decodeTarget( 0 ), decodePos( 0 ), rawPos( 0 ), failed( false ) {
43 void SlipBIO::setTarget( std::shared_ptr<OpensslBIO> target ) {
44 this->target = target;
47 SlipBIO::SlipBIO( std::shared_ptr<OpensslBIO> target ) : target( target ), buffer( std::vector<char>( BUFFER_SIZE ) ), decodeTarget( 0 ), decodePos( 0 ), rawPos( 0 ), failed( false ) {
50 SlipBIO::~SlipBIO() {}
52 int SlipBIO::write( const char* buf, int num ) {
54 std::cout << "Out: " << toHex( buf, num ) << std::endl;
59 for( int i = 0; i < num; i++ ) {
60 if( ( buf[i] == SLIP_PACKET ) || ( buf[i] == SLIP_ESCAPE_CHAR ) ) {
65 int totalLen = num + badOnes + 1; // 2
66 char* targetPtr = ( char* ) malloc( totalLen );
72 std::shared_ptr<char> t = std::shared_ptr<char>( targetPtr, free );
75 for( int i = 0; i < num; i++ ) {
76 if( buf[i] == SLIP_PACKET ) {
77 targetPtr[j++] = SLIP_ESCAPE_CHAR;
78 targetPtr[j++] = ( char )0xDC;
79 } else if( buf[i] == SLIP_ESCAPE_CHAR ) {
80 targetPtr[j++] = SLIP_ESCAPE_CHAR;
81 targetPtr[j++] = ( char )0xDD;
83 targetPtr[j++] = buf[i];
87 targetPtr[j++] = SLIP_PACKET;
93 int dlen = target->write( targetPtr + sent, std::min( 1024, j - sent ) );
96 throw "Error, target write failed";
97 } else if( dlen == 0 ) {
112 int SlipBIO::read( char* buf, int size ) {
113 // while we have no data to decode or unmasking does not yield a full package
114 while( !packageLeft && ( decodePos >= rawPos || !unmask() ) ) {
116 // we have no data, read more
117 if( buffer.size() - rawPos < 64 ) {
118 // not enough space... package is too big
123 int len = target->read( buffer.data() + rawPos, buffer.capacity() - rawPos );
136 int len = std::min( decodeTarget, ( unsigned int ) size );
137 // a package finished, return it
138 std::copy( buffer.data(), buffer.data() + len, buf );
139 // move the buffer contents back
140 std::copy( buffer.data() + len, buffer.data() + decodeTarget, buffer.data() );
143 if( decodeTarget == 0 ) {
148 std::cout << "in: " << toHex( buf, len ) << std::endl;
154 long SlipBIO::ctrl( int cmod, long arg1, void* arg2 ) {
159 if( cmod == BIO_CTRL_RESET ) {
160 char resetSequence[] = {SLIP_ESCAPE_CHAR, 0, SLIP_PACKET};
161 target->write( resetSequence, 3 );
165 std::cout << "resetting SLIP" << std::endl;
169 return target->ctrl( cmod, arg1, arg2 );
172 const char* SlipBIO::getName() {
176 bool SlipBIO::unmask() {
177 unsigned int j = decodeTarget;
179 for( unsigned int i = decodePos; i < rawPos; i++ ) {
180 if( buffer[i] == SLIP_ESCAPE_CHAR ) {
185 buffer[decodeTarget] = buffer[i - 1];
186 decodePos = decodeTarget;
187 rawPos = decodePos + 1;
188 return 0;// no packet
189 } else if( buffer[i] == ( char )0xdc ) {
190 buffer[j++] = SLIP_PACKET;
191 } else if( buffer[i] == ( char )0xdd ) {
192 buffer[j++] = SLIP_ESCAPE_CHAR;
193 } else if( buffer[i] == SLIP_PACKET ) {
203 } else if( buffer[i] == SLIP_PACKET ) {
207 // copy rest to bufferfer i to len
215 buffer[j++] = buffer[i];