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/* <!-- copyright */
/*
* aria2 - a simple utility for downloading files faster
*
* Copyright (C) 2006 Tatsuhiro Tsujikawa
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* copyright --> */
#include "PeerConnection.h"
#include "message.h"
#include "DlAbortEx.h"
#include "PeerMessageUtil.h"
#include "Util.h"
#include "LogFactory.h"
#include <netinet/in.h>
PeerConnection::PeerConnection(int cuid,
const SocketHandle& socket,
const Option* op)
:cuid(cuid),
socket(socket),
option(op),
logger(logger),
resbufLength(0),
currentPayloadLength(0),
lenbufLength(0) {
logger = LogFactory::getInstance();
}
PeerConnection::~PeerConnection() {}
int PeerConnection::sendMessage(const char* msg, int length) {
int writtenLength = 0;
if(socket->isWritable(0)) {
socket->writeData(msg, length);
writtenLength += length;
}
return writtenLength;
}
bool PeerConnection::receiveMessage(char* msg, int& length) {
if(!socket->isReadable(0)) {
return false;
}
if(resbufLength == 0 && lenbufLength != 4) {
// read payload size, 4-byte integer
int remain = 4-lenbufLength;
int temp = remain;
socket->readData(lenbuf+lenbufLength, temp);
if(temp == 0) {
// we got EOF
throw new DlAbortEx(EX_EOF_FROM_PEER);
}
if(remain != temp) {
// still 4-temp bytes to go
lenbufLength += temp;
return false;
}
//payloadLen = ntohl(nPayloadLen);
int payloadLength = ntohl(*((int*)lenbuf));
if(payloadLength > MAX_PAYLOAD_LEN || payloadLength < 0) {
throw new DlAbortEx("max payload length exceeded or invalid. length = %d",
payloadLength);
}
currentPayloadLength = payloadLength;
}
// we have currentPayloadLen-resbufLen bytes to read
int remaining = currentPayloadLength-resbufLength;
if(remaining > 0) {
socket->readData(resbuf+resbufLength, remaining);
if(remaining == 0) {
// we got EOF
throw new DlAbortEx(EX_EOF_FROM_PEER);
}
resbufLength += remaining;
if(currentPayloadLength != resbufLength) {
return false;
}
}
// we got whole payload.
resbufLength = 0;
lenbufLength = 0;
memcpy(msg, resbuf, currentPayloadLength);
length = currentPayloadLength;
return true;
}
bool PeerConnection::receiveHandshake(char* msg, int& length) {
if(!socket->isReadable(0)) {
length = 0;
return false;
}
int remain = HANDSHAKE_MESSAGE_LENGTH-resbufLength;
int temp = remain;
socket->readData(resbuf+resbufLength, temp);
if(temp == 0) {
// we got EOF
throw new DlAbortEx(EX_EOF_FROM_PEER);
}
bool retval;
if(remain != temp) {
retval = false;
} else {
retval = true;
}
resbufLength += temp;
// we got whole handshake payload
int writeLength = resbufLength > length ? length : resbufLength;
memcpy(msg, resbuf, writeLength);
length = writeLength;
if(retval) {
resbufLength = 0;
}
return retval;
}
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