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
addrToStr(const struct in6_addr & addr)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
Address()38 Address::Address() {
39 mStorage.reserve(sizeof(struct sockaddr_storage));
40 }
41
Address(const struct sockaddr_nl & address)42 Address::Address(const struct sockaddr_nl& address)
43 : mStorage(sizeof(address)) {
44 memcpy(mStorage.data(), &address, sizeof(address));
45 }
Address(const struct sockaddr_in6 & address)46 Address::Address(const struct sockaddr_in6& address)
47 : mStorage(sizeof(address)) {
48 memcpy(mStorage.data(), &address, sizeof(address));
49 }
50
Address(struct in6_addr address)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
reset()58 void Address::reset() {
59 mStorage.resize(sizeof(struct sockaddr_storage));
60 }
61
resolveInet(const std::string & address)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
resolveEth(const std::string & interfaceName)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