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/***************************************************************************
* fqterm, a terminal emulator for both BBS and *nix. *
* Copyright (C) 2008 fqterm development group. *
* *
* 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., *
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. *
***************************************************************************/
#include "fqterm_trace.h"
#include "fqterm_ssh1_packet.h"
#include "ssh_endian.h"
#include "crc32.h"
#include "ssh_packet.h"
namespace FQTerm {
//==============================================================================
//FQTermSSH1PacketReceiver
//==============================================================================
FQTermSSH1PacketReceiver::FQTermSSH1PacketReceiver()
{
cipher = new_3des_ssh1(0);
}
void FQTermSSH1PacketReceiver::parseData(buffer *input) {
u_int mycrc, gotcrc;
u_char *buf = NULL;
u_char *targetData = NULL;
u_char *sourceData = NULL;
// Get the length of the packet.
while (buffer_len(input) > 0) {
if (buffer_len(input) < 4) {
FQ_TRACE("ssh1packet", 3) << "The packet is too small.";
return ;
}
buf = buffer_data(input);
real_data_len_ = ntohu32(buf);
if (real_data_len_ > SSH_BUFFER_MAX) {
emit packetError(tr("parseData: The packet is too big"));
return ;
}
u_int total_len = (real_data_len_ + 8) &~7;
u_int padding_len = total_len - real_data_len_;
real_data_len_ -= 5;
buffer_clear(&recvbuf);
// Get the data of the packet.
if (buffer_len(input) - 4 < (long)total_len) {
FQ_TRACE("ssh1packet", 3) << "The packet is too small";
return ;
}
real_data_len_ = buffer_get_u32(input) - 5;
targetData = new u_char[total_len];
sourceData = new u_char[total_len];
memset(targetData, 0, total_len);
memset(sourceData, 0, total_len);
buffer_get(input, sourceData, total_len);
if (cipher->started) {
cipher->crypt(cipher, sourceData, targetData, total_len);
} else {
memcpy(targetData, sourceData, total_len);
}
buffer_append(&recvbuf, targetData, total_len);
// Check the crc32.
buf = buffer_data(&recvbuf) + total_len - 4;
mycrc = ntohu32(buf);
gotcrc = ssh_crc32(buffer_data(&recvbuf), total_len - 4);
if (mycrc != gotcrc) {
emit packetError(tr("parseData: bad CRC32"));
break;
}
// Drop the padding.
buffer_consume(&recvbuf, padding_len);
packet_type_ = buffer_get_u8(&recvbuf);
emit packetAvaliable(packet_type_);
delete [] sourceData;
delete [] targetData;
}
}
} // namespace FQTerm
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