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// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <algorithm>
#include <fstream>
#include <sstream>
#include <vector>
#include "common/bit_cast.h"
#include "common/common_types.h"
#include "common/logging/log.h"
#include "common/settings.h"
#include "common/string_util.h"
#include "core/internal_network/network_interface.h"
#ifdef _WIN32
#include <iphlpapi.h>
#else
#include <cerrno>
#include <ifaddrs.h>
#include <net/if.h>
#endif
namespace Network {
#ifdef _WIN32
std::vector<NetworkInterface> GetAvailableNetworkInterfaces() {
std::vector<IP_ADAPTER_ADDRESSES> adapter_addresses;
DWORD ret = ERROR_BUFFER_OVERFLOW;
DWORD buf_size = 0;
// retry up to 5 times
for (int i = 0; i < 5 && ret == ERROR_BUFFER_OVERFLOW; i++) {
ret = GetAdaptersAddresses(
AF_INET, GAA_FLAG_SKIP_MULTICAST | GAA_FLAG_SKIP_DNS_SERVER | GAA_FLAG_INCLUDE_GATEWAYS,
nullptr, adapter_addresses.data(), &buf_size);
if (ret != ERROR_BUFFER_OVERFLOW) {
break;
}
adapter_addresses.resize((buf_size / sizeof(IP_ADAPTER_ADDRESSES)) + 1);
}
if (ret != NO_ERROR) {
LOG_ERROR(Network, "Failed to get network interfaces with GetAdaptersAddresses");
return {};
}
std::vector<NetworkInterface> result;
for (auto current_address = adapter_addresses.data(); current_address != nullptr;
current_address = current_address->Next) {
if (current_address->FirstUnicastAddress == nullptr ||
current_address->FirstUnicastAddress->Address.lpSockaddr == nullptr) {
continue;
}
if (current_address->OperStatus != IfOperStatusUp) {
continue;
}
const auto ip_addr = Common::BitCast<struct sockaddr_in>(
*current_address->FirstUnicastAddress->Address.lpSockaddr)
.sin_addr;
ULONG mask = 0;
if (ConvertLengthToIpv4Mask(current_address->FirstUnicastAddress->OnLinkPrefixLength,
&mask) != NO_ERROR) {
LOG_ERROR(Network, "Failed to convert IPv4 prefix length to subnet mask");
continue;
}
struct in_addr gateway = {.S_un{.S_addr{0}}};
if (current_address->FirstGatewayAddress != nullptr &&
current_address->FirstGatewayAddress->Address.lpSockaddr != nullptr) {
gateway = Common::BitCast<struct sockaddr_in>(
*current_address->FirstGatewayAddress->Address.lpSockaddr)
.sin_addr;
}
result.emplace_back(NetworkInterface{
.name{Common::UTF16ToUTF8(std::wstring{current_address->FriendlyName})},
.ip_address{ip_addr},
.subnet_mask = in_addr{.S_un{.S_addr{mask}}},
.gateway = gateway});
}
return result;
}
#else
std::vector<NetworkInterface> GetAvailableNetworkInterfaces() {
struct ifaddrs* ifaddr = nullptr;
if (getifaddrs(&ifaddr) != 0) {
LOG_ERROR(Network, "Failed to get network interfaces with getifaddrs: {}",
std::strerror(errno));
return {};
}
std::vector<NetworkInterface> result;
for (auto ifa = ifaddr; ifa != nullptr; ifa = ifa->ifa_next) {
if (ifa->ifa_addr == nullptr || ifa->ifa_netmask == nullptr) {
continue;
}
if (ifa->ifa_addr->sa_family != AF_INET) {
continue;
}
if ((ifa->ifa_flags & IFF_UP) == 0 || (ifa->ifa_flags & IFF_LOOPBACK) != 0) {
continue;
}
u32 gateway{};
std::ifstream file{"/proc/net/route"};
if (!file.is_open()) {
LOG_ERROR(Network, "Failed to open \"/proc/net/route\"");
result.emplace_back(NetworkInterface{
.name{ifa->ifa_name},
.ip_address{Common::BitCast<struct sockaddr_in>(*ifa->ifa_addr).sin_addr},
.subnet_mask{Common::BitCast<struct sockaddr_in>(*ifa->ifa_netmask).sin_addr},
.gateway{in_addr{.s_addr = gateway}}});
continue;
}
// ignore header
file.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
bool gateway_found = false;
for (std::string line; std::getline(file, line);) {
std::istringstream iss{line};
std::string iface_name;
iss >> iface_name;
if (iface_name != ifa->ifa_name) {
continue;
}
iss >> std::hex;
u32 dest{};
iss >> dest;
if (dest != 0) {
// not the default route
continue;
}
iss >> gateway;
u16 flags{};
iss >> flags;
// flag RTF_GATEWAY (defined in <linux/route.h>)
if ((flags & 0x2) == 0) {
continue;
}
gateway_found = true;
break;
}
if (!gateway_found) {
gateway = 0;
}
result.emplace_back(NetworkInterface{
.name{ifa->ifa_name},
.ip_address{Common::BitCast<struct sockaddr_in>(*ifa->ifa_addr).sin_addr},
.subnet_mask{Common::BitCast<struct sockaddr_in>(*ifa->ifa_netmask).sin_addr},
.gateway{in_addr{.s_addr = gateway}}});
}
freeifaddrs(ifaddr);
return result;
}
#endif
std::optional<NetworkInterface> GetSelectedNetworkInterface() {
const auto& selected_network_interface = Settings::values.network_interface.GetValue();
const auto network_interfaces = Network::GetAvailableNetworkInterfaces();
if (network_interfaces.empty()) {
LOG_ERROR(Network, "GetAvailableNetworkInterfaces returned no interfaces");
return std::nullopt;
}
const auto res =
std::ranges::find_if(network_interfaces, [&selected_network_interface](const auto& iface) {
return iface.name == selected_network_interface;
});
if (res == network_interfaces.end()) {
LOG_ERROR(Network, "Couldn't find selected interface \"{}\"", selected_network_interface);
return std::nullopt;
}
return *res;
}
void SelectFirstNetworkInterface() {
const auto network_interfaces = Network::GetAvailableNetworkInterfaces();
if (network_interfaces.empty()) {
return;
}
Settings::values.network_interface.SetValue(network_interfaces[0].name);
}
} // namespace Network
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