diff options
Diffstat (limited to 'src/protocol/internal/fqterm_ssh1_packet.cpp')
| -rw-r--r-- | src/protocol/internal/fqterm_ssh1_packet.cpp | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/src/protocol/internal/fqterm_ssh1_packet.cpp b/src/protocol/internal/fqterm_ssh1_packet.cpp new file mode 100644 index 0000000..ded7fe4 --- /dev/null +++ b/src/protocol/internal/fqterm_ssh1_packet.cpp @@ -0,0 +1,148 @@ +/*************************************************************************** + * 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_ssh_buffer.h" +#include "fqterm_ssh1_packet.h" +#include "fqterm_ssh_des.h" + +#include "fqterm_serialization.h" +#include "crc32.h" + +namespace FQTerm { +//============================================================================== +//FQTermSSH1PacketSender +//============================================================================== +//============================================================================== +// +// SSH1 Packet Structure: +// -------------------------------------------------------------------------- +// | length | padding | type | data | crc32 | +// -------------------------------------------------------------------------- +// | uint32 | 1-7bytes | uchar | | 4bytes| +// -------------------------------------------------------------------------- +// encrypt = padding + type + data + crc32 +// length = type + data + crc32 +// +//============================================================================== + +void FQTermSSH1PacketSender::makePacket() { + int len, padding, i; + u_int32_t rand_val = 0; + + delete output_buffer_; + + len = buffer_->len() + 4; //CRC32 + padding = 8-(len % 8); + + output_buffer_ = new FQTermSSHBuffer(len + padding + 4); //pktlen and crc32 + output_buffer_->putInt(len); + + for (i = 0; i < padding; i++) { + if (i % 4 == 0) { + rand_val = rand(); // FIXME: rand() doesn't range from 0 to 2^32. + } + + output_buffer_->putByte(rand_val &0xff); + rand_val >>= 8; + } + + output_buffer_->putRawData((const char*)buffer_->data(), buffer_->len()); + output_buffer_->putInt(ssh_crc32(output_buffer_->data() + 4, output_buffer_->len() - 4)); + + if (is_encrypt_) { + cipher_->encrypt(output_buffer_->data() + 4, output_buffer_->data() + 4, output_buffer_->len() - 4); + } + +} + +//============================================================================== +//FQTermSSH1PacketReceiver +//============================================================================== +void FQTermSSH1PacketReceiver::parseData(FQTermSSHBuffer *input) { + u_int mycrc, gotcrc; + u_char *buf = NULL; + u_char *targetData = NULL; + u_char *sourceData = NULL; + + // Get the length of the packet. + while (input->len() > 0) { + if (input->len() < 4) { + FQ_TRACE("ssh1packet", 3) << "The packet is too small."; + return ; + } + buf = input->data(); + 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(); + + // Get the data of the packet. + if (input->len() - 4 < (long)total_len) { + FQ_TRACE("ssh1packet", 3) << "The packet is too small"; + return ; + } + + real_data_len_ = input->getInt() - 5; + targetData = new u_char[total_len]; + sourceData = new u_char[total_len]; + memset(targetData, 0, total_len); + memset(sourceData, 0, total_len); + + input->getRawData((char*)sourceData, total_len); + if (is_decrypt_) { + cipher_->decrypt(sourceData, targetData, total_len); + } else { + memcpy(targetData, sourceData, total_len); + } + + buffer_->putRawData((char*)targetData, total_len); + + // Check the crc32. + buf = buffer_->data() + total_len - 4; + mycrc = ntohu32(buf); + gotcrc = ssh_crc32(buffer_->data(), total_len - 4); + + if (mycrc != gotcrc) { + emit packetError(tr("parseData: bad CRC32")); + break; + } + + // Drop the padding. + buffer_->consume(padding_len); + + packet_type_ = buffer_->getByte(); + + emit packetAvaliable(packet_type_); + + delete [] sourceData; + delete [] targetData; + } +} + +} // namespace FQTerm |