7 #include "log/logger.hpp"
9 static constexpr std::size_t buffer_size = 8192;
11 #define SLIP_ESCAPE_CHAR ( (char) 0xDB)
12 #define SLIP_CONNECTION ( (char) 0xC0)
13 #define SLIP_RESET ( (char) 0xCB )
15 //#define SLIP_IO_DEBUG
16 //#define RAW_IO_DEBUG
17 //#define UNMASK_DEBUG
19 char hexDigit( char c ) {
35 std::string toHex( const char* buf, int len ) {
36 std::string data = "000000";
38 for( int i = 0; i < len; i++ ) {
39 data.append( 1, ' ' );
40 data.append( 1, hexDigit( ( buf[i] >> 4 ) & 0xF ) );
41 data.append( 1, hexDigit( buf[i] & 0xF ) );
47 SlipBIO::SlipBIO() : buffer( std::vector<char>( buffer_size ) ), decodeTarget( 0 ), decodePos( 0 ), rawPos( 0 ) {
50 void SlipBIO::setTarget( std::shared_ptr<OpensslBIO> target, bool server ) {
51 this->target = target;
52 this->server = server;
55 SlipBIO::SlipBIO( std::shared_ptr<OpensslBIO> target ) : target( target ), buffer( std::vector<char>( buffer_size ) ), decodeTarget( 0 ), decodePos( 0 ), rawPos( 0 ) {
58 SlipBIO::~SlipBIO() {}
60 int SlipBIO::write( const char* buf, int num ) {
62 logger::notef( "slip-out: %s", toHex( buf, num ) );
65 logger::note( "denying read because of reset-need!" );
72 for( int i = 0; i < num; i++ ) {
73 if( ( buf[i] == SLIP_CONNECTION ) || ( buf[i] == SLIP_ESCAPE_CHAR ) ) {
78 int totalLen = num + badOnes; // 2
79 char* targetPtr = ( char* ) malloc( totalLen );
85 std::shared_ptr<char> t = std::shared_ptr<char>( targetPtr, free );
88 for( int i = 0; i < num; i++ ) {
89 if( buf[i] == SLIP_CONNECTION ) {
90 targetPtr[j++] = SLIP_ESCAPE_CHAR;
91 targetPtr[j++] = ( char )0xDC;
92 } else if( buf[i] == SLIP_ESCAPE_CHAR ) {
93 targetPtr[j++] = SLIP_ESCAPE_CHAR;
94 targetPtr[j++] = ( char )0xDD;
96 targetPtr[j++] = buf[i];
105 int dlen = target->write( targetPtr + sent, std::min( 1024, j - sent ) );
107 std::ostringstream debug;
108 debug << "Wrote " << dlen << " bytes: ";
109 debug << toHex( targetPtr + sent, dlen );
110 logger::note( debug.str() );
114 throw "Error, target write failed";
115 } else if( dlen == 0 ) {
117 logger::note( "waiting for write ability" );
131 int SlipBIO::read( char* buf, int size ) {
133 logger::note( "starting read" );
135 // while we have no data to decode or unmasking does not yield a full package
136 while( decodeTarget == 0 ) {
138 logger::note( "denying read because of reset-need!" );
141 if(decodePos < rawPos) {
144 continue; // probably Packet :-)
145 } else if(res == -1) {
146 logger::note( "sending reset because of malfomed packet" );
150 if( decodeTarget != 0 ){
151 // we have data now, emit it!
154 // we have no data, read more
155 if( buffer.size() - rawPos < 64 ) {
156 // not enough space... package is too big
158 waitForConnection = true;
165 logger::note( "beginning read" );
168 std::ostringstream converter;
169 converter << "rawPos is now: " << rawPos << ", buffer.size():" << buffer.size();
170 logger::note( converter.str() );
172 int len = target->read( buffer.data() + rawPos, buffer.size() - rawPos );
174 logger::note( toHex(buffer.data() + rawPos, len ) );
179 logger::note("Reporting EOS from slip");
186 if( waitForReset ) return -1;
188 int len = std::min( decodeTarget, ( unsigned int ) size );
189 // a package finished, return it
190 std::copy( buffer.data(), buffer.data() + len, buf );
191 // move the buffer contents back
192 std::copy( buffer.data() + len, buffer.data() + decodeTarget, buffer.data() );
195 std::ostringstream convert;
196 convert << "decodeTarget: " << decodeTarget << ", rawPos: " << rawPos << ", decodePos: " << decodePos;
197 convert << ", requested were: " << size;
198 logger::note( convert.str() );
201 if(decodeTarget == 0 && rawPos <= decodePos + 1){
202 // compact the remaining at most 1 byte of raw data
203 buffer[0] = buffer[decodePos];
209 logger::notef( "slip-in: %s", toHex( buf, len ) );
215 long SlipBIO::ctrl( int cmod, long arg1, void* arg2 ) {
220 if( cmod == BIO_CTRL_RESET ) {
223 waitForReset = false;
224 waitForConnection = true;
228 char resetSequence[] = {SLIP_CONNECTION, 1,2,3,4,5,6,7, ctr};
229 target->write( resetSequence, 9 );
230 header = {1, 2, 3, 4, 5, 6, 7, ctr};
232 waitForConnection = true;
233 logger::note( "Resetting SLIP layer" );
236 }else if(cmod == BIO_CTRL_FLUSH ){
238 logger::note( "flush requested ");
242 return target->ctrl( cmod, arg1, arg2 );
245 const char* SlipBIO::getName() {
249 // 1 success, data avail, 0 need moar data (see that decodeTarget is still 0),
250 // -1: fail... connection needs resetting
251 int SlipBIO::unmask() {
254 std::ostringstream conv;
255 conv << "unmasking starting, decodeTarget: " << decodeTarget << " decodePos: " << decodePos << " rawPos: " << rawPos << "bytes stored";
256 logger::note( conv.str() );
258 logger::note( "unmasking" );
260 if( waitForConnection ){
262 logger::note( "scanning for connection" );
267 logger::note( "on server site, waiting for CONNECTION-byte");
269 while(decodePos < rawPos) {
270 if(buffer[decodePos] == SLIP_CONNECTION) {
273 logger::note( "got connection byte" );
275 } else if(resetCounter >= 0) {
276 header[resetCounter] = buffer[decodePos];
280 if( resetCounter >= ((int) header.size()) ){
281 waitForConnection = false;
282 char data[] = { SLIP_CONNECTION };
283 target->write( data, 1);
285 logger::notef( "SLIP, initing connection with ping-seq %s:", toHex(header.data(), header.size()) );
287 target->write( header.data(), header.size() );
291 if( decodePos >= rawPos ){
294 return 0; // no package
298 while(decodePos < rawPos) {
299 if(buffer[decodePos] == SLIP_CONNECTION) {
301 logger::note( "got connbyte" );
304 } else if(resetCounter >= 0) {
306 logger::note( "got head-byte" );
308 if(buffer[decodePos] == header[resetCounter]) {
315 if( resetCounter >= ((int) header.size()) ){
316 waitForConnection = false;
318 logger::note("connection found! :-)!");
323 if( decodePos >= rawPos ){
326 return 0; // no package
330 unsigned int j = decodeTarget;
332 for( unsigned int i = decodePos; i < rawPos; i++ ) {
333 if(waitForConnection && buffer[i] != SLIP_CONNECTION ) {
336 if( buffer[i] == SLIP_ESCAPE_CHAR ) {
341 buffer[decodeTarget] = buffer[i - 1];
342 decodePos = decodeTarget;
343 rawPos = decodePos + 1;
344 return 0;// no packet
345 } else if( buffer[i] == ( char )0xdc ) {
346 buffer[j++] = SLIP_CONNECTION;
347 } else if( buffer[i] == ( char )0xdd ) {
348 buffer[j++] = SLIP_ESCAPE_CHAR;
349 } else if( buffer[i] == SLIP_ESCAPE_CHAR
350 || buffer[i] == SLIP_CONNECTION ) {
356 waitForConnection = true;
361 return -1; // we don't have a pkg, set all appropriately to wait for a pkg start for next pkg.
363 } else if( buffer[i] == SLIP_CONNECTION ) {
367 // copy rest to bufferfer i to len
368 if( !waitForConnection ) {
371 waitForConnection = true;
374 logger::note( "error connection failed" );
377 logger::note( "got package border; slip re-validated SHOULD NEVER HAPPEN!!" );
379 waitForConnection = false;
381 buffer[j++] = buffer[i];
386 std::ostringstream conv;
387 conv << "unmasking paused, 0 remaining, " << j << "bytes stored";
388 logger::note( conv.str() );
393 return decodeTarget > 0;