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ESP32: Add EndpointQueueFilter for ESP32 platform (project-chip#31440)
* Add EndpointQueueFilter for ESP32 platform * Restyled by clang-format * Restyled by gn * fix compile error when disabling inet ipv4 * review changes * Restyled by clang-format * review changes * review changes --------- Co-authored-by: Restyled.io <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| /* | ||
| * | ||
| * Copyright (c) 2023 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. | ||
| */ | ||
|
|
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| #pragma once | ||
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| #include <inet/EndpointQueueFilter.h> | ||
| #include <inet/IPAddress.h> | ||
| #include <lwip/ip_addr.h> | ||
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| namespace chip { | ||
| namespace Inet { | ||
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| class ESP32EndpointQueueFilter : public EndpointQueueFilter | ||
| { | ||
| public: | ||
| CHIP_ERROR SetMdnsHostName(const chip::CharSpan & hostName) | ||
| { | ||
| ReturnErrorCodeIf(hostName.size() != sizeof(mHostNameBuffer), CHIP_ERROR_INVALID_ARGUMENT); | ||
| ReturnErrorCodeIf(!IsValidMdnsHostName(hostName), CHIP_ERROR_INVALID_ARGUMENT); | ||
| memcpy(mHostNameBuffer, hostName.data(), hostName.size()); | ||
| return CHIP_NO_ERROR; | ||
| } | ||
|
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| FilterOutcome FilterBeforeEnqueue(const void * endpoint, const IPPacketInfo & pktInfo, | ||
| const chip::System::PacketBufferHandle & pktPayload) override | ||
| { | ||
| if (!IsMdnsBroadcastPacket(pktInfo)) | ||
| { | ||
| return FilterOutcome::kAllowPacket; | ||
| } | ||
| // Drop the mDNS packets which don't contain 'matter' or '<device-hostname>'. | ||
| const uint8_t matterBytes[] = { 'm', 'a', 't', 't', 'e', 'r' }; | ||
| if (PayloadContains(pktPayload, ByteSpan(matterBytes)) || PayloadContainsHostNameCaseInsensitive(pktPayload)) | ||
| { | ||
| return FilterOutcome::kAllowPacket; | ||
| } | ||
| return FilterOutcome::kDropPacket; | ||
| } | ||
|
|
||
| FilterOutcome FilterAfterDequeue(const void * endpoint, const IPPacketInfo & pktInfo, | ||
| const chip::System::PacketBufferHandle & pktPayload) override | ||
| { | ||
| return FilterOutcome::kAllowPacket; | ||
| } | ||
|
|
||
| private: | ||
| // TODO: Add unit tests for these static functions | ||
| static bool IsMdnsBroadcastPacket(const IPPacketInfo & pktInfo) | ||
| { | ||
| if (pktInfo.DestPort == 5353) | ||
| { | ||
| #if INET_CONFIG_ENABLE_IPV4 | ||
| ip_addr_t mdnsIPv4BroadcastAddr = IPADDR4_INIT_BYTES(224, 0, 0, 251); | ||
| if (pktInfo.DestAddress == chip::Inet::IPAddress(mdnsIPv4BroadcastAddr)) | ||
| { | ||
| return true; | ||
| } | ||
| #endif | ||
| ip_addr_t mdnsIPv6BroadcastAddr = IPADDR6_INIT_HOST(0xFF020000, 0, 0, 0xFB); | ||
| if (pktInfo.DestAddress == chip::Inet::IPAddress(mdnsIPv6BroadcastAddr)) | ||
| { | ||
| return true; | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
|
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| static bool PayloadContains(const chip::System::PacketBufferHandle & payload, const chip::ByteSpan & byteSpan) | ||
| { | ||
| if (payload->HasChainedBuffer() || payload->TotalLength() < byteSpan.size()) | ||
| { | ||
| return false; | ||
| } | ||
| for (size_t i = 0; i <= payload->TotalLength() - byteSpan.size(); ++i) | ||
| { | ||
| if (memcmp(payload->Start() + i, byteSpan.data(), byteSpan.size()) == 0) | ||
| { | ||
| return true; | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
|
|
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| bool PayloadContainsHostNameCaseInsensitive(const chip::System::PacketBufferHandle & payload) | ||
| { | ||
| uint8_t hostNameLowerCase[12]; | ||
| memcpy(hostNameLowerCase, mHostNameBuffer, sizeof(mHostNameBuffer)); | ||
| for (size_t i = 0; i < sizeof(hostNameLowerCase); ++i) | ||
| { | ||
| if (hostNameLowerCase[i] <= 'F' && hostNameLowerCase[i] >= 'A') | ||
| { | ||
| hostNameLowerCase[i] = 'a' + hostNameLowerCase[i] - 'A'; | ||
| } | ||
| } | ||
| return PayloadContains(payload, ByteSpan(mHostNameBuffer)) || PayloadContains(payload, ByteSpan(hostNameLowerCase)); | ||
| } | ||
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| static bool IsValidMdnsHostName(const chip::CharSpan & hostName) | ||
| { | ||
| for (size_t i = 0; i < hostName.size(); ++i) | ||
| { | ||
| char ch_data = *(hostName.data() + i); | ||
| if (!((ch_data >= '0' && ch_data <= '9') || (ch_data >= 'A' && ch_data <= 'F'))) | ||
| { | ||
| return false; | ||
| } | ||
| } | ||
| return true; | ||
| } | ||
|
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| uint8_t mHostNameBuffer[12] = { 0 }; | ||
| }; | ||
|
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| } // namespace Inet | ||
| } // namespace chip |