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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
#include "qpid/amqp/Sasl.h"
#include "qpid/amqp/Decoder.h"
#include "qpid/amqp/Descriptor.h"
#include "qpid/amqp/Encoder.h"
#include "qpid/log/Statement.h"
#include "qpid/framing/Buffer.h"
#include "qpid/framing/ProtocolVersion.h"
#include "qpid/framing/ProtocolInitiation.h"
#include <string.h>
namespace qpid {
namespace amqp {
Sasl::Sasl(const std::string& i) : id(i), buffer(2*512/*AMQP 1.0's MAX_MIN_FRAME_SIZE - is this enough though?*/), encoder(&buffer[0], buffer.size()) {}
Sasl::~Sasl() {}
void* Sasl::startFrame()
{
//write sasl frame header, leaving 4 bytes for total size
char* start = encoder.skip(4);
encoder.write((uint8_t) 0x02);//data offset
encoder.write((uint8_t) 0x01);//frame type
encoder.write((uint16_t) 0x0000);//ignored
return start;
}
void Sasl::endFrame(void* frame)
{
//now backfill the frame size
char* start = (char*) frame;
char* current = &buffer[encoder.getPosition()];
uint32_t frameSize = current - start;
Encoder backfill(start, 4);
backfill.write(frameSize);
QPID_LOG(trace, "Completed encoding of frame of " << frameSize << " bytes");
}
std::size_t Sasl::read(const char* data, size_t available)
{
size_t consumed = 0;
while (available - consumed > 4/*framesize*/) {
Decoder decoder(data+consumed, available-consumed);
//read frame-header
uint32_t frameSize = decoder.readUInt();
if (frameSize > decoder.getSize()) break;//don't have all the data for this frame yet
QPID_LOG(trace, "Reading SASL frame of size " << frameSize);
decoder.resetSize(frameSize);
uint8_t dataOffset = decoder.readUByte();
uint8_t frameType = decoder.readUByte();
if (frameType != 0x01) {
QPID_LOG(error, "Expected SASL frame; got type " << frameType);
}
uint16_t ignored = decoder.readUShort();
if (ignored) {
QPID_LOG(info, "Got non null bytes at end of SASL frame header");
}
//body is at offset 4*dataOffset from the start
size_t skip = dataOffset*4 - 8;
if (skip) {
QPID_LOG(info, "Offset for sasl frame was not as expected");
decoder.advance(skip);
}
decoder.read(*this);
consumed += decoder.getPosition();
}
return consumed;
}
std::size_t Sasl::write(char* data, size_t size)
{
size_t available = encoder.getPosition();
if (available) {
size_t encoded = available > size ? size : available;
::memcpy(data, &buffer[0], encoded);
size_t remainder = encoder.getPosition() - encoded;
if (remainder) {
//shuffle
::memcpy(&buffer[0], &buffer[size], remainder);
}
encoder.resetPosition(remainder);
return encoded;
} else {
return 0;
}
}
std::size_t Sasl::readProtocolHeader(const char* buffer, std::size_t size)
{
framing::ProtocolInitiation pi(qpid::framing::ProtocolVersion(1,0,qpid::framing::ProtocolVersion::SASL));
if (size >= pi.encodedSize()) {
qpid::framing::Buffer out(const_cast<char*>(buffer), size);
pi.decode(out);
QPID_LOG_CAT(debug, protocol, id << " read protocol header: " << pi);
return pi.encodedSize();
} else {
return 0;
}
}
std::size_t Sasl::writeProtocolHeader(char* buffer, std::size_t size)
{
framing::ProtocolInitiation pi(qpid::framing::ProtocolVersion(1,0,qpid::framing::ProtocolVersion::SASL));
if (size >= pi.encodedSize()) {
QPID_LOG_CAT(debug, protocol, id << " writing protocol header: " << pi);
qpid::framing::Buffer out(buffer, size);
pi.encode(out);
return pi.encodedSize();
} else {
QPID_LOG_CAT(warning, protocol, id << " insufficient buffer for protocol header: " << size)
return 0;
}
}
}} // namespace qpid::amqp
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