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/*
* Copyright (C) 2018 The Android Open Source Project
*
* 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 "netdutils/InternetAddresses.h"
#include <string>
#include <android-base/stringprintf.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/socket.h>
#include <sys/types.h>
namespace android {
using base::StringPrintf;
namespace netdutils {
std::string IPAddress::toString() const noexcept {
char repr[INET6_ADDRSTRLEN] = "\0";
switch (mData.family) {
case AF_UNSPEC:
return "<unspecified>";
case AF_INET: {
const in_addr v4 = mData.ip.v4;
inet_ntop(AF_INET, &v4, repr, sizeof(repr));
break;
}
case AF_INET6: {
const in6_addr v6 = mData.ip.v6;
inet_ntop(AF_INET6, &v6, repr, sizeof(repr));
break;
}
default:
return "<unknown_family>";
}
if (mData.family == AF_INET6 && mData.scope_id > 0) {
return StringPrintf("%s%%%u", repr, mData.scope_id);
}
return repr;
}
bool IPAddress::forString(const std::string& repr, IPAddress* ip) {
const addrinfo hints = {
.ai_flags = AI_NUMERICHOST | AI_NUMERICSERV,
};
addrinfo* res;
const int ret = getaddrinfo(repr.c_str(), nullptr, &hints, &res);
ScopedAddrinfo res_cleanup(res);
if (ret != 0) {
return false;
}
bool rval = true;
switch (res[0].ai_family) {
case AF_INET: {
sockaddr_in* sin = (sockaddr_in*) res[0].ai_addr;
if (ip) *ip = IPAddress(sin->sin_addr);
break;
}
case AF_INET6: {
sockaddr_in6* sin6 = (sockaddr_in6*) res[0].ai_addr;
if (ip) *ip = IPAddress(sin6->sin6_addr, sin6->sin6_scope_id);
break;
}
default:
rval = false;
break;
}
return rval;
}
IPPrefix::IPPrefix(const IPAddress& ip, int length) : IPPrefix(ip) {
// Silently treat CIDR lengths like "-1" as meaning the full bit length
// appropriate to the address family.
if (length < 0) return;
if (length >= mData.cidrlen) return;
switch (mData.family) {
case AF_UNSPEC:
break;
case AF_INET: {
const in_addr_t mask = (length > 0) ? (~0U) << (IPV4_ADDR_BITS - length) : 0U;
mData.ip.v4.s_addr &= htonl(mask);
mData.cidrlen = static_cast<uint8_t>(length);
break;
}
case AF_INET6: {
// The byte in which this CIDR length falls.
const int which = length / 8;
const int mask = (length % 8 == 0) ? 0 : 0xff << (8 - length % 8);
mData.ip.v6.s6_addr[which] &= mask;
for (int i = which + 1; i < IPV6_ADDR_LEN; i++) {
mData.ip.v6.s6_addr[i] = 0U;
}
mData.cidrlen = static_cast<uint8_t>(length);
break;
}
default:
// TODO: Complain bitterly about possible data corruption?
return;
}
}
bool IPPrefix::isUninitialized() const noexcept {
static const internal_::compact_ipdata empty{};
return mData == empty;
}
bool IPPrefix::forString(const std::string& repr, IPPrefix* prefix) {
size_t index = repr.find('/');
if (index == std::string::npos) return false;
// Parse the IP address.
IPAddress ip;
if (!IPAddress::forString(repr.substr(0, index), &ip)) return false;
// Parse the prefix length. Can't use base::ParseUint because it accepts non-base 10 input.
const char* prefixString = repr.c_str() + index + 1;
if (!isdigit(*prefixString)) return false;
char* endptr;
unsigned long prefixlen = strtoul(prefixString, &endptr, 10);
if (*endptr != '\0') return false;
uint8_t maxlen = (ip.family() == AF_INET) ? 32 : 128;
if (prefixlen > maxlen) return false;
*prefix = IPPrefix(ip, prefixlen);
return true;
}
std::string IPPrefix::toString() const noexcept {
return StringPrintf("%s/%d", ip().toString().c_str(), mData.cidrlen);
}
std::string IPSockAddr::toString() const noexcept {
switch (mData.family) {
case AF_INET6:
return StringPrintf("[%s]:%u", ip().toString().c_str(), mData.port);
default:
return StringPrintf("%s:%u", ip().toString().c_str(), mData.port);
}
}
} // namespace netdutils
} // namespace android
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