1 /* 2 * Copyright (C) 2019 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 #pragma once 17 18 #include <cstddef> 19 #include <set> 20 #include <string> 21 #include <vector> 22 23 #include "common/libs/fs/shared_fd.h" 24 25 namespace cuttlefish { 26 // Creates, or connects to if it already exists, a tap network interface. The 27 // user needs CAP_NET_ADMIN to create such interfaces or be the owner to connect 28 // to one. 29 SharedFD OpenTapInterface(const std::string& interface_name); 30 31 // Returns a list of TAP devices that have open file descriptors 32 std::set<std::string> TapInterfacesInUse(); 33 34 struct DnsmasqDhcp4Lease { 35 std::uint64_t expiry; 36 std::uint8_t mac_address[6]; 37 std::uint8_t ip_address[4]; 38 std::string hostname; 39 std::string client_id; 40 }; 41 42 // Parses a dnsmasq lease file 43 std::vector<DnsmasqDhcp4Lease> ParseDnsmasqLeases(SharedFD lease_file); 44 45 std::ostream& operator<<(std::ostream&, const DnsmasqDhcp4Lease&); 46 47 // Sends a DHCPRELEASE message over the socket; 48 bool ReleaseDhcp4(SharedFD tap, const std::uint8_t mac_address[6], 49 const std::uint8_t ip_address[4], 50 const std::uint8_t dhcp_server_ip[4]); 51 52 } 53