1 /* 2 * Copyright (C) 2017 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 17 #include "address.h" 18 19 #include <arpa/inet.h> 20 #include <errno.h> 21 #include <linux/if_ether.h> 22 #include <linux/if_packet.h> 23 #include <netdb.h> 24 #include <net/if.h> 25 #include <string.h> 26 #include <sys/ioctl.h> 27 28 #include "socket.h" 29 30 std::string addrToStr(const struct in6_addr& addr) { 31 char buf[INET6_ADDRSTRLEN]; 32 if (inet_ntop(AF_INET6, &addr, buf, sizeof(buf)) == nullptr) { 33 return "[unknown]"; 34 } 35 return buf; 36 } 37 38 Address::Address() { 39 mStorage.reserve(sizeof(struct sockaddr_storage)); 40 } 41 42 Address::Address(const struct sockaddr_nl& address) 43 : mStorage(sizeof(address)) { 44 memcpy(mStorage.data(), &address, sizeof(address)); 45 } 46 Address::Address(const struct sockaddr_in6& address) 47 : mStorage(sizeof(address)) { 48 memcpy(mStorage.data(), &address, sizeof(address)); 49 } 50 51 Address::Address(struct in6_addr address) 52 : mStorage(sizeof(struct sockaddr_in6)) { 53 auto sockaddr = reinterpret_cast<struct sockaddr_in6*>(mStorage.data()); 54 sockaddr->sin6_family = AF_INET6; 55 sockaddr->sin6_addr = address; 56 } 57 58 void Address::reset() { 59 mStorage.resize(sizeof(struct sockaddr_storage)); 60 } 61 62 Result Address::resolveInet(const std::string& address) { 63 struct addrinfo hints; 64 memset(&hints, 0, sizeof(hints)); 65 hints.ai_family = AF_INET6; 66 hints.ai_socktype = SOCK_RAW; 67 struct addrinfo* addrinfo; 68 int res = ::getaddrinfo(address.c_str(), nullptr, &hints, &addrinfo); 69 if (res != 0) { 70 return Result::error(gai_strerror(res)); 71 } 72 mStorage.resize(addrinfo->ai_addrlen); 73 memcpy(mStorage.data(), addrinfo->ai_addr, mStorage.size()); 74 freeaddrinfo(addrinfo); 75 76 return Result::success(); 77 } 78 79 Result Address::resolveEth(const std::string& interfaceName) { 80 mStorage.resize(sizeof(struct sockaddr_ll)); 81 memset(mStorage.data(), 0, mStorage.size()); 82 auto addr = reinterpret_cast<struct sockaddr_ll*>(mStorage.data()); 83 addr->sll_family = AF_PACKET; 84 addr->sll_protocol = htons(ETH_P_IPV6); 85 86 unsigned int index = if_nametoindex(interfaceName.c_str()); 87 if (index == 0) { 88 return Result::error(strerror(errno)); 89 } 90 addr->sll_ifindex = index; 91 92 struct ifreq request; 93 memset(&request, 0, sizeof(request)); 94 strncpy(request.ifr_name, interfaceName.c_str(), sizeof(request.ifr_name)); 95 request.ifr_name[sizeof(request.ifr_name) - 1] = '\0'; 96 97 Socket socket; 98 Result res = socket.open(AF_INET, SOCK_DGRAM, IPPROTO_IP); 99 if (!res) { 100 return res; 101 } 102 int status = ::ioctl(socket.get(), SIOCGIFHWADDR, &request); 103 if (status != 0) { 104 return Result::error(strerror(errno)); 105 } 106 memcpy(addr->sll_addr, request.ifr_addr.sa_data, 6); 107 108 return Result::success(); 109 } 110
