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/*
* Copyright 2018 Google Inc.
*
* Licensed 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 "process.hpp"
#include "ipmi.hpp"
#include <cstring>
#include <unordered_map>
#include <vector>
namespace blobs
{
/* Used by all commands with data. */
struct BmcRx
{
uint8_t cmd;
uint16_t crc;
uint8_t data; /* one byte minimum of data. */
} __attribute__((packed));
static const std::unordered_map<BlobOEMCommands, IpmiBlobHandler> handlers = {
{BlobOEMCommands::bmcBlobGetCount, getBlobCount},
{BlobOEMCommands::bmcBlobEnumerate, enumerateBlob},
{BlobOEMCommands::bmcBlobOpen, openBlob},
{BlobOEMCommands::bmcBlobRead, readBlob},
{BlobOEMCommands::bmcBlobWrite, writeBlob},
{BlobOEMCommands::bmcBlobCommit, commitBlob},
{BlobOEMCommands::bmcBlobClose, closeBlob},
{BlobOEMCommands::bmcBlobDelete, deleteBlob},
{BlobOEMCommands::bmcBlobStat, statBlob},
{BlobOEMCommands::bmcBlobSessionStat, sessionStatBlob},
{BlobOEMCommands::bmcBlobWriteMeta, writeMeta},
};
IpmiBlobHandler validateBlobCommand(CrcInterface* crc, const uint8_t* reqBuf,
uint8_t* replyCmdBuf, size_t* dataLen)
{
size_t requestLength = (*dataLen);
/* We know dataLen is at least 1 already */
auto command = static_cast<BlobOEMCommands>(reqBuf[0]);
/* Validate it's at least well-formed. */
if (!validateRequestLength(command, requestLength))
{
return nullptr;
}
/* If there is a payload. */
if (requestLength > sizeof(uint8_t))
{
/* Verify the request includes: command, crc16, data */
if (requestLength < sizeof(struct BmcRx))
{
return nullptr;
}
/* We don't include the command byte at offset 0 as part of the crc
* payload area or the crc bytes at the beginning.
*/
size_t requestBodyLen = requestLength - 3;
/* We start after the command byte. */
std::vector<uint8_t> bytes(requestBodyLen);
/* It likely has a well-formed payload. */
struct BmcRx request;
std::memcpy(&request, reqBuf, sizeof(request));
uint16_t crcValue = request.crc;
/* Set the in-place CRC to zero. */
std::memcpy(bytes.data(), &reqBuf[3], requestBodyLen);
crc->clear();
crc->compute(bytes.data(), bytes.size());
/* Crc expected but didn't match. */
if (crcValue != crc->get())
{
return nullptr;
}
}
/* Grab the corresponding handler for the command. */
auto found = handlers.find(command);
if (found == handlers.end())
{
return nullptr;
}
return found->second;
}
ipmi_ret_t processBlobCommand(IpmiBlobHandler cmd, ManagerInterface* mgr,
CrcInterface* crc, const uint8_t* reqBuf,
uint8_t* replyCmdBuf, size_t* dataLen)
{
ipmi_ret_t result = cmd(mgr, reqBuf, replyCmdBuf, dataLen);
if (result != IPMI_CC_OK)
{
return result;
}
size_t replyLength = (*dataLen);
/* The command, whatever it was, returned success. */
if (replyLength == 0)
{
return result;
}
/* The response, if it has one byte, has three, to include the crc16. */
if (replyLength < (sizeof(uint16_t) + 1))
{
return IPMI_CC_INVALID;
}
/* The command, whatever it was, replied, so let's set the CRC. */
crc->clear();
replyCmdBuf[0] = 0x00;
replyCmdBuf[1] = 0x00;
crc->compute(replyCmdBuf, replyLength);
/* Copy the CRC into place. */
uint16_t crcValue = crc->get();
std::memcpy(replyCmdBuf, &crcValue, sizeof(crcValue));
return result;
}
} // namespace blobs
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