| /* |
| * |
| * Copyright (c) 2020 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 <inet/Inet.h> |
| #include <lib/dnssd/minimal_mdns/Server.h> |
| |
| namespace MdnsExample { |
| |
| /// Returns |
| /// - NULL interface for IPv4 |
| /// - all interfaces for IPv6 |
| class AllInterfaces : public mdns::Minimal::ListenIterator |
| { |
| public: |
| AllInterfaces(bool enableIpV4) : mState(enableIpV4 ? State::kIpV4 : State::kIpV6) |
| { |
| if (!enableIpV4) |
| { |
| SkipToFirstValidInterface(); |
| } |
| } |
| |
| bool Next(chip::Inet::InterfaceId * id, chip::Inet::IPAddressType * type) override |
| { |
| if (mState == State::kIpV4) |
| { |
| #if INET_CONFIG_ENABLE_IPV4 |
| *id = chip::Inet::InterfaceId::Null(); |
| *type = chip::Inet::IPAddressType::kIPv4; |
| #endif |
| mState = State::kIpV6; |
| |
| SkipToFirstValidInterface(); |
| |
| #if INET_CONFIG_ENABLE_IPV4 |
| return true; |
| #endif |
| } |
| |
| if (!mIterator.HasCurrent()) |
| { |
| return false; |
| } |
| |
| *id = mIterator.GetInterfaceId(); |
| *type = chip::Inet::IPAddressType::kIPv6; |
| |
| for (mIterator.Next(); SkipCurrentInterface(); mIterator.Next()) |
| { |
| } |
| return true; |
| } |
| |
| private: |
| enum class State |
| { |
| kIpV4, |
| kIpV6, |
| }; |
| State mState; |
| chip::Inet::InterfaceIterator mIterator; |
| |
| void SkipToFirstValidInterface() |
| { |
| if (SkipCurrentInterface()) |
| { |
| while (mIterator.Next()) |
| { |
| if (!SkipCurrentInterface()) |
| { |
| break; |
| } |
| } |
| } |
| } |
| |
| bool SkipCurrentInterface() |
| { |
| if (!mIterator.HasCurrent()) |
| { |
| return false; // nothing to try. |
| } |
| |
| if (!mIterator.IsUp()) |
| { |
| return true; // not a usable interface |
| } |
| |
| char name[chip::Inet::InterfaceId::kMaxIfNameLength]; |
| if (mIterator.GetInterfaceName(name, sizeof(name)) != CHIP_NO_ERROR) |
| { |
| printf("!!!! FAILED TO GET INTERFACE NAME\n"); |
| return true; |
| } |
| |
| if (strncmp(name, "lo", 2) == 0) |
| { |
| printf("Skipping interface '%s' (assume local loopback)\n", name); |
| return true; |
| } |
| |
| printf("Usable interface: %s\n", name); |
| |
| return false; |
| } |
| }; |
| |
| } // namespace MdnsExample |