blob: 25bdfbf2cbf3414fefd955ba3ef41e77b6681d92 [file] [log] [blame]
/*
*
* Copyright (c) 2021 Project CHIP Authors
*
* 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 "ServiceNaming.h"
#include <lib/core/CHIPEncoding.h>
#include <lib/support/BytesToHex.h>
#include <lib/support/CodeUtils.h>
#include <cstdio>
#include <inttypes.h>
#include <string.h>
namespace chip {
namespace Dnssd {
CHIP_ERROR MakeInstanceName(char * buffer, size_t bufferLen, const PeerId & peerId)
{
ReturnErrorCodeIf(bufferLen <= Operational::kInstanceNameMaxLength, CHIP_ERROR_BUFFER_TOO_SMALL);
NodeId nodeId = peerId.GetNodeId();
CompressedFabricId fabricId = peerId.GetCompressedFabricId();
snprintf(buffer, bufferLen, "%08" PRIX32 "%08" PRIX32 "-%08" PRIX32 "%08" PRIX32, static_cast<uint32_t>(fabricId >> 32),
static_cast<uint32_t>(fabricId), static_cast<uint32_t>(nodeId >> 32), static_cast<uint32_t>(nodeId));
return CHIP_NO_ERROR;
}
CHIP_ERROR ExtractIdFromInstanceName(const char * name, PeerId * peerId)
{
ReturnErrorCodeIf(name == nullptr, CHIP_ERROR_INVALID_ARGUMENT);
ReturnErrorCodeIf(peerId == nullptr, CHIP_ERROR_INVALID_ARGUMENT);
// Make sure the string is long enough.
static constexpr size_t fabricIdByteLength = 8;
static constexpr size_t fabricIdStringLength = fabricIdByteLength * 2;
static constexpr size_t nodeIdByteLength = 8;
static constexpr size_t nodeIdStringLength = nodeIdByteLength * 2;
static constexpr size_t totalLength = fabricIdStringLength + nodeIdStringLength + 1; // +1 for '-'
// Ensure we have at least totalLength chars.
size_t len = strnlen(name, totalLength);
ReturnErrorCodeIf(len < totalLength, CHIP_ERROR_INVALID_ARGUMENT);
// Check that we have a proper terminator.
ReturnErrorCodeIf(name[totalLength] != '\0' && name[totalLength] != '.', CHIP_ERROR_WRONG_NODE_ID);
// Check what we have a separator where we expect.
ReturnErrorCodeIf(name[fabricIdStringLength] != '-', CHIP_ERROR_WRONG_NODE_ID);
static constexpr size_t bufferSize = max(fabricIdByteLength, nodeIdByteLength);
uint8_t buf[bufferSize];
ReturnErrorCodeIf(Encoding::HexToBytes(name, fabricIdStringLength, buf, bufferSize) == 0, CHIP_ERROR_WRONG_NODE_ID);
// Buf now stores the fabric id, as big-endian bytes.
static_assert(fabricIdByteLength == sizeof(uint64_t), "Wrong number of bytes");
peerId->SetCompressedFabricId(Encoding::BigEndian::Get64(buf));
ReturnErrorCodeIf(Encoding::HexToBytes(name + fabricIdStringLength + 1, nodeIdStringLength, buf, bufferSize) == 0,
CHIP_ERROR_WRONG_NODE_ID);
// Buf now stores the node id id, as big-endian bytes.
static_assert(nodeIdByteLength == sizeof(uint64_t), "Wrong number of bytes");
peerId->SetNodeId(Encoding::BigEndian::Get64(buf));
return CHIP_NO_ERROR;
}
CHIP_ERROR MakeHostName(char * buffer, size_t bufferLen, const chip::ByteSpan & macOrEui64)
{
ReturnErrorCodeIf(bufferLen < macOrEui64.size() * 2 + 1, CHIP_ERROR_BUFFER_TOO_SMALL);
int idx = 0;
for (size_t i = 0; i < macOrEui64.size(); ++i)
{
idx += snprintf(buffer + idx, 3, "%02X", macOrEui64.data()[i]);
}
return CHIP_NO_ERROR;
}
CHIP_ERROR MakeServiceSubtype(char * buffer, size_t bufferLen, DiscoveryFilter subtype)
{
int requiredSize;
switch (subtype.type)
{
case DiscoveryFilterType::kShortDiscriminator:
// 4-bit number
if (subtype.code >= 1 << 4)
{
return CHIP_ERROR_INVALID_ARGUMENT;
}
requiredSize = snprintf(buffer, bufferLen, "_S%u", static_cast<uint16_t>(subtype.code));
break;
case DiscoveryFilterType::kLongDiscriminator:
// 12-bit number
if (subtype.code >= 1 << 12)
{
return CHIP_ERROR_INVALID_ARGUMENT;
}
requiredSize = snprintf(buffer, bufferLen, "_L%u", static_cast<uint16_t>(subtype.code));
break;
case DiscoveryFilterType::kVendorId:
if (subtype.code >= 1 << 16)
{
return CHIP_ERROR_INVALID_ARGUMENT;
}
requiredSize = snprintf(buffer, bufferLen, "_V%u", static_cast<uint16_t>(subtype.code));
break;
case DiscoveryFilterType::kDeviceType:
requiredSize = snprintf(buffer, bufferLen, "_T%" PRIu32, static_cast<uint32_t>(subtype.code));
break;
case DiscoveryFilterType::kCommissioningMode:
requiredSize = snprintf(buffer, bufferLen, "_CM");
break;
case DiscoveryFilterType::kCommissioner:
if (subtype.code > 1)
{
return CHIP_ERROR_INVALID_ARGUMENT;
}
requiredSize = snprintf(buffer, bufferLen, "_D%u", static_cast<uint16_t>(subtype.code));
break;
case DiscoveryFilterType::kCompressedFabricId:
requiredSize = snprintf(buffer, bufferLen, "_I");
return Encoding::Uint64ToHex(subtype.code, &buffer[requiredSize], bufferLen - static_cast<size_t>(requiredSize),
Encoding::HexFlags::kUppercaseAndNullTerminate);
break;
case DiscoveryFilterType::kInstanceName:
requiredSize = snprintf(buffer, bufferLen, "%s", subtype.instanceName);
break;
case DiscoveryFilterType::kNone:
requiredSize = 0;
buffer[0] = '\0';
break;
}
return (static_cast<size_t>(requiredSize) <= (bufferLen - 1)) ? CHIP_NO_ERROR : CHIP_ERROR_NO_MEMORY;
}
CHIP_ERROR MakeServiceTypeName(char * buffer, size_t bufferLen, DiscoveryFilter nameDesc, DiscoveryType type)
{
int requiredSize;
if (nameDesc.type == DiscoveryFilterType::kNone)
{
if (type == DiscoveryType::kCommissionableNode)
{
requiredSize = snprintf(buffer, bufferLen, kCommissionableServiceName);
}
else if (type == DiscoveryType::kCommissionerNode)
{
requiredSize = snprintf(buffer, bufferLen, kCommissionerServiceName);
}
else
{
return CHIP_ERROR_NOT_IMPLEMENTED;
}
}
else
{
ReturnErrorOnFailure(MakeServiceSubtype(buffer, bufferLen, nameDesc));
size_t subtypeLen = strlen(buffer);
if (type == DiscoveryType::kCommissionableNode)
{
requiredSize = snprintf(buffer + subtypeLen, bufferLen - subtypeLen, ".%s.%s", kSubtypeServiceNamePart,
kCommissionableServiceName);
}
else if (type == DiscoveryType::kCommissionerNode)
{
requiredSize =
snprintf(buffer + subtypeLen, bufferLen - subtypeLen, ".%s.%s", kSubtypeServiceNamePart, kCommissionerServiceName);
}
else if (type == DiscoveryType::kOperational)
{
requiredSize =
snprintf(buffer + subtypeLen, bufferLen - subtypeLen, ".%s.%s", kSubtypeServiceNamePart, kOperationalServiceName);
}
else
{
return CHIP_ERROR_NOT_IMPLEMENTED;
}
}
return (static_cast<size_t>(requiredSize) <= (bufferLen - 1)) ? CHIP_NO_ERROR : CHIP_ERROR_NO_MEMORY;
}
} // namespace Dnssd
} // namespace chip