[core/internal_network] cleanup network interface code a bit (#2905)

Signed-off-by: lizzie <lizzie@eden-emu.dev>
Co-authored-by: Caio Oliveira <caiooliveirafarias0@gmail.com>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/2905
Reviewed-by: Maufeat <sahyno1996@gmail.com>
Reviewed-by: DraVee <dravee@eden-emu.dev>
Co-authored-by: lizzie <lizzie@eden-emu.dev>
Co-committed-by: lizzie <lizzie@eden-emu.dev>

4 files changed, 203 insertions, 205 deletions

diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index 14eb331d24..8bcb66ac35 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -1131,7 +1131,6 @@ add_library(core STATIC
     internal_network/socket_proxy.cpp
     internal_network/socket_proxy.h
     internal_network/sockets.h
-    internal_network/wifi_scanner.cpp
     internal_network/wifi_scanner.h
     launch_timestamp_cache.cpp
     launch_timestamp_cache.h
@@ -1170,9 +1169,12 @@ add_library(core STATIC
     tools/renderdoc.h)
 
 if (ENABLE_WIFI_SCAN)
-    # find_package(libiw REQUIRED)
-    target_compile_definitions(core PRIVATE ENABLE_WIFI_SCAN)
-    target_link_libraries(core PRIVATE iw)
+    target_sources(core PRIVATE internal_network/wifi_scanner.cpp)
+    if (PLATFORM_LINUX)
+        target_link_libraries(core PRIVATE iw)
+    endif()
+else()
+    target_sources(core PRIVATE internal_network/wifi_scanner_dummy.cpp)
 endif()
 
 if (WIN32)
diff --git a/src/core/internal_network/network_interface.cpp b/src/core/internal_network/network_interface.cpp
index 8e8f099be8..48be1e2dc4 100644
--- a/src/core/internal_network/network_interface.cpp
+++ b/src/core/internal_network/network_interface.cpp
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 #include <algorithm>
@@ -9,21 +9,39 @@
 #include <ranges>
 #include <bit>
 
-#include "common/common_types.h"
-#include "common/logging/log.h"
-#include "common/settings.h"
-#include "common/string_util.h"
-#include "core/internal_network/emu_net_state.h"
-#include "core/internal_network/network_interface.h"
-
 #ifdef _WIN32
+#include <winsock2.h>
+#include <windows.h>
 #include <iphlpapi.h>
-#else
+#elif defined(__linux__) || defined(__ANDROID__)
 #include <cerrno>
 #include <ifaddrs.h>
 #include <net/if.h>
+#elif defined(__FreeBSD__)
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/socket.h>
+#include <net/if.h>
+#include <net/route.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/sysctl.h>
+#include <net/if.h>
+#include <net/route.h>
+#include <net/if_dl.h>
+#include <netinet/in.h>
+#include <netinet/if_ether.h>
+#include <arpa/inet.h>
+#include <netdb.h>
 #endif
 
+#include "common/common_types.h"
+#include "common/logging/log.h"
+#include "common/settings.h"
+#include "common/string_util.h"
+#include "core/internal_network/emu_net_state.h"
+#include "core/internal_network/network_interface.h"
+
 namespace Network {
 
 #ifdef _WIN32
@@ -71,22 +89,12 @@ std::vector<Network::NetworkInterface> GetAvailableNetworkInterfaces() {
             gw = reinterpret_cast<sockaddr_in*>(a->FirstGatewayAddress->Address.lpSockaddr)
                      ->sin_addr;
 
-        HostAdapterKind kind = HostAdapterKind::Ethernet;
-        switch (a->IfType) {
-        case IF_TYPE_IEEE80211: // 802.11 Wi-Fi
-            kind = HostAdapterKind::Wifi;
-            break;
-        default:
-            kind = HostAdapterKind::Ethernet;
-            break;
-        }
-
         result.emplace_back(Network::NetworkInterface{
             .name = Common::UTF16ToUTF8(std::wstring{a->FriendlyName}),
             .ip_address = ip,
             .subnet_mask = mask,
             .gateway = gw,
-            .kind = kind
+            .kind = (a->IfType == IF_TYPE_IEEE80211 ? HostAdapterKind::Wifi : HostAdapterKind::Ethernet)
         });
     }
 
@@ -96,158 +104,146 @@ std::vector<Network::NetworkInterface> GetAvailableNetworkInterfaces() {
 #else
 
 std::vector<Network::NetworkInterface> GetAvailableNetworkInterfaces() {
+#if defined(__ANDROID__) || defined(__linux__)
     struct ifaddrs* ifaddr = nullptr;
-
     if (getifaddrs(&ifaddr) != 0) {
-        LOG_ERROR(Network, "Failed to get network interfaces with getifaddrs: {}",
-                  std::strerror(errno));
+        LOG_ERROR(Network, "getifaddrs: {}", std::strerror(errno));
         return {};
     }
 
-    std::vector<Network::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;
-        }
-
-#ifdef ANDROID
-        // On Android, we can't reliably get gateway info from /proc/net/route
-        // Just use 0 as the gateway address
-        result.emplace_back(Network::NetworkInterface{
-                .name{ifa->ifa_name},
-                .ip_address{std::bit_cast<struct sockaddr_in>(*ifa->ifa_addr).sin_addr},
-                .subnet_mask{std::bit_cast<struct sockaddr_in>(*ifa->ifa_netmask).sin_addr},
-                .gateway{in_addr{.s_addr = 0}}
-        });
+    // TODO: This is still horrible, it was worse before (somehow)
+    struct RoutingEntry {
+        std::string iface_name;
+        u32 dest;
+        u32 gateway;
+        u32 flags;
+    };
+    std::vector<RoutingEntry> routes{};
+#ifdef __ANDROID__
+    // Even through Linux based, we can't reliably obtain routing information from there :(
 #else
-        u32 gateway{};
-
-        std::ifstream file{"/proc/net/route"};
-        if (!file.is_open()) {
-            LOG_ERROR(Network, "Failed to open \"/proc/net/route\"");
-
-            // Solaris defines s_addr as a macro, can't use special C++ shenanigans here
-            in_addr gateway_0;
-            gateway_0.s_addr = gateway;
-            result.emplace_back(Network::NetworkInterface{
-                .name = ifa->ifa_name,
-                .ip_address = std::bit_cast<struct sockaddr_in>(*ifa->ifa_addr).sin_addr,
-                .subnet_mask = std::bit_cast<struct sockaddr_in>(*ifa->ifa_netmask).sin_addr,
-                .gateway = gateway_0
-            });
-            continue;
-        }
-
-        // ignore header
-        file.ignore((std::numeric_limits<std::streamsize>::max)(), '\n');
-
-        bool gateway_found = false;
-
+    if (std::ifstream file("/proc/net/route"); file.is_open()) {
+        file.ignore((std::numeric_limits<std::streamsize>::max)(), '\n'); //ignore header
         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;
+            RoutingEntry info{};
+            iss >> info.iface_name >> std::hex
+                >> info.dest >> info.gateway >> info.flags;
+            routes.emplace_back(info);
         }
-
-        in_addr gateway_0;
-        gateway_0.s_addr = gateway;
-        result.emplace_back(Network::NetworkInterface{
+    } else {
+        LOG_WARNING(Network, "\"/proc/net/route\" not found - using gateway 0");
+    }
+#endif
+    std::vector<Network::NetworkInterface> ifaces;
+    for (auto ifa = ifaddr; ifa != nullptr; ifa = ifa->ifa_next) {
+        if (ifa->ifa_addr == nullptr || ifa->ifa_netmask == nullptr /* Have a netmask and address */
+        || ifa->ifa_addr->sa_family != AF_INET /* Must be of kind AF_INET */
+        || (ifa->ifa_flags & IFF_UP) == 0 || (ifa->ifa_flags & IFF_LOOPBACK) != 0) /* Not loopback */
+            continue;
+        // Just use 0 as the gateway address if not found OR routes are empty :)
+        auto const it = std::ranges::find_if(routes, [&ifa](auto const& e) {
+            return e.iface_name == ifa->ifa_name
+                && e.dest == 0 // not the default route
+                && (e.flags & 0x02) != 0; // flag RTF_GATEWAY (defined in <linux/route.h>)
+        });
+        in_addr gw; // Solaris defines s_addr as a macro, can't use special C++ shenanigans here
+        gw.s_addr = it != routes.end() ? it->gateway : 0;
+        ifaces.emplace_back(Network::NetworkInterface{
             .name = ifa->ifa_name,
             .ip_address = std::bit_cast<struct sockaddr_in>(*ifa->ifa_addr).sin_addr,
             .subnet_mask = std::bit_cast<struct sockaddr_in>(*ifa->ifa_netmask).sin_addr,
-            .gateway = gateway_0
+            .gateway = gw
         });
-#endif // ANDROID
     }
-
     freeifaddrs(ifaddr);
-    return result;
-}
-
-#endif // _WIN32
-
-std::optional<Network::NetworkInterface> GetSelectedNetworkInterface() {
+    return ifaces;
+#elif defined(__FreeBSD__)
+    std::vector<Network::NetworkInterface> ifaces;
+    int fd = ::socket(PF_ROUTE, SOCK_RAW, AF_UNSPEC);
+    if (fd < 0) {
+        LOG_ERROR(Network, "socket: {}", std::strerror(errno));
+        return {};
+    }
 
-    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;
+    size_t bufsz = 0;
+    int mib[6] = {
+        CTL_NET, PF_ROUTE, 0,
+        AF_UNSPEC, NET_RT_IFLIST, 0
+    };
+    if (::sysctl(mib, sizeof(mib) / sizeof(mib[0]), nullptr, &bufsz, nullptr, 0) < 0) {
+        LOG_ERROR(Network, "sysctl.1: {}", std::strerror(errno));
+        ::close(fd);
+        return {};
+    }
+    std::vector<char> buf(bufsz);
+    if (::sysctl(mib, sizeof(mib) / sizeof(mib[0]), buf.data(), &bufsz, nullptr, 0) < 0) {
+        LOG_ERROR(Network, "sysctl.2: {}", std::strerror(errno));
+        ::close(fd);
+        return {};
     }
 
-    #ifdef __ANDROID__
-        if (selected_network_interface.empty()) {
-            return network_interfaces[0];
+    struct rt_msghdr const *rtm = NULL;
+    for (char *next = buf.data(); next < buf.data() + bufsz; next += rtm->rtm_msglen) {
+        rtm = (struct rt_msghdr const *)next;
+        if (rtm->rtm_type == RTM_IFINFO) {
+            struct if_msghdr const* ifm = (struct if_msghdr const *)rtm;
+            size_t msglen = rtm->rtm_msglen - sizeof(*ifm);
+            char const* p = (char const*)(ifm + 1);
+
+            Network::NetworkInterface iface{};
+            for (size_t i = 0; i < RTAX_MAX; i++)
+                if ((ifm->ifm_addrs & (1 << i)) != 0) {
+                    struct sockaddr const* sa = reinterpret_cast<struct sockaddr const*>(p);
+                    if (msglen == 0 || msglen < SA_SIZE(sa))
+                        break;
+                    if (i == RTA_NETMASK && sa->sa_family == AF_LINK) {
+                        size_t namelen = 0;
+                        struct sockaddr_dl const* sdl = reinterpret_cast<struct sockaddr_dl const*>(sa);
+                        ::link_ntoa_r(sdl, nullptr, &namelen);
+                        iface.name = std::string(namelen, ' ');
+                        ::link_ntoa_r(sdl, iface.name.data(), &namelen);
+                        std::memcpy(&iface.ip_address, sa, sizeof(struct sockaddr_in));
+                    }
+                    msglen -= SA_SIZE(sa);
+                    p += SA_SIZE(sa);
+                }
+            ifaces.push_back(iface);
         }
-    #endif
+    }
+    ::close(fd);
+    return ifaces;
+#else
+    return {};
+#endif
+}
 
-    const auto res =
-        std::ranges::find_if(network_interfaces, [&selected_network_interface](const auto& iface) {
-            return iface.name == selected_network_interface;
-        });
+#endif // _WIN32
 
-    if (res == network_interfaces.end()) {
+std::optional<Network::NetworkInterface> GetSelectedNetworkInterface() {
+    auto const& sel_if = Settings::values.network_interface.GetValue();
+    if (auto const ifaces = Network::GetAvailableNetworkInterfaces(); ifaces.size() > 0) {
+        if (sel_if.empty())
+            return ifaces[0];
+        if (auto const res = std::ranges::find_if(ifaces, [&sel_if](const auto& iface) {
+            return iface.name == sel_if;
+        }); res != ifaces.end())
+            return *res;
         // Only print the error once to avoid log spam
         static bool print_error = true;
         if (print_error) {
-            LOG_ERROR(Network, "Couldn't find selected interface \"{}\"",
-                      selected_network_interface);
+            LOG_WARNING(Network, "Couldn't find interface \"{}\"", sel_if);
             print_error = false;
         }
-
         return std::nullopt;
     }
-
-    return *res;
+    LOG_WARNING(Network, "No interfaces");
+    return std::nullopt;
 }
 
 void SelectFirstNetworkInterface() {
-    const auto network_interfaces = Network::GetAvailableNetworkInterfaces();
-
-    if (network_interfaces.empty()) {
-        return;
-    }
-
-    Settings::values.network_interface.SetValue(network_interfaces[0].name);
+    if (auto const ifaces = Network::GetAvailableNetworkInterfaces(); ifaces.size() > 0)
+        Settings::values.network_interface.SetValue(ifaces[0].name);
 }
 
 } // namespace Network
diff --git a/src/core/internal_network/wifi_scanner.cpp b/src/core/internal_network/wifi_scanner.cpp
index 127221099f..1b97f69177 100644
--- a/src/core/internal_network/wifi_scanner.cpp
+++ b/src/core/internal_network/wifi_scanner.cpp
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 #include <chrono>
@@ -6,11 +6,6 @@
 #include <thread>
 #include <vector>
 
-#include "common/logging/log.h"
-#include "core/internal_network/wifi_scanner.h"
-
-using namespace std::chrono_literals;
-
 #ifdef _WIN32
 #define NOMINMAX
 #include <windows.h>
@@ -18,16 +13,30 @@ using namespace std::chrono_literals;
 #ifdef _MSC_VER
 #pragma comment(lib, "wlanapi.lib")
 #endif
+#elif defined(__linux__) && !defined(__ANDROID__)
+#include <iwlib.h>
+#elif defined(__FreeBSD__)
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/socket.h>
+#include <net/if.h>
+#include <net/ethernet.h>
+#include <net80211/ieee80211_ioctl.h>
 #endif
 
+#include "common/logging/log.h"
+#include "core/internal_network/network_interface.h"
+#include "core/internal_network/wifi_scanner.h"
+
+using namespace std::chrono_literals;
+
 namespace Network {
-#ifdef ENABLE_WIFI_SCAN
 #ifdef _WIN32
 static u8 QualityToPercent(DWORD q) {
-    return static_cast<u8>(q);
+    return u8(q);
 }
 
-static std::vector<Network::ScanData> ScanWifiWin(std::chrono::milliseconds deadline) {
+std::vector<Network::ScanData> ScanWifiNetworks(std::chrono::milliseconds deadline) {
     std::vector<Network::ScanData> out;
 
     HANDLE hClient{};
@@ -85,38 +94,16 @@ static std::vector<Network::ScanData> ScanWifiWin(std::chrono::milliseconds dead
     WlanCloseHandle(hClient, nullptr);
     return out;
 }
-#endif /* _WIN32 */
-
-#if defined(__linux__) && !defined(_WIN32) && !defined(ANDROID)
-#include <iwlib.h>
-
+#elif defined(__linux__) && !defined(__ANDROID__)
 static u8 QualityToPercent(const iwrange& r, const wireless_scan* ws) {
     const iw_quality qual = ws->stats.qual;
     const int lvl = qual.level;
     const int max = r.max_qual.level ? r.max_qual.level : 100;
-    return static_cast<u8>(std::clamp(100 * lvl / max, 0, 100));
-}
-
-static int wifi_callback(int skfd, char* ifname, char* args[], int count)
-{
-    iwrange range;
-
-    int res = iw_get_range_info(skfd, ifname, &range);
-
-    LOG_INFO(Network, "ifname {} returned {} on iw_get_range_info", ifname, res);
-
-    if (res >= 0) {
-        strncpy(args[0], ifname, IFNAMSIZ - 1);
-        args[0][IFNAMSIZ - 1] = 0;
-
-        return 1;
-    }
-
-    return 0;
+    return u8(std::clamp(100 * lvl / max, 0, 100));
 }
 
 // TODO(crueter, Maufeat): Check if driver supports wireless extensions, fallback to nl80211 if not
-static std::vector<Network::ScanData> ScanWifiLinux(std::chrono::milliseconds deadline) {
+std::vector<Network::ScanData> ScanWifiNetworks(std::chrono::milliseconds deadline) {
     std::vector<Network::ScanData> out;
     int sock = iw_sockets_open();
     if (sock < 0) {
@@ -127,7 +114,17 @@ static std::vector<Network::ScanData> ScanWifiLinux(std::chrono::milliseconds de
     char ifname[IFNAMSIZ] = {0};
     char *args[1] = {ifname};
 
-    iw_enum_devices(sock, &wifi_callback, args, 0);
+    iw_enum_devices(sock, [](int skfd, char* ifname, char* args[], int count) -> int {
+        iwrange range;
+        int res = iw_get_range_info(skfd, ifname, &range);
+        LOG_INFO(Network, "ifname {} returned {} on iw_get_range_info", ifname, res);
+        if (res >= 0) {
+            strncpy(args[0], ifname, IFNAMSIZ - 1);
+            args[0][IFNAMSIZ - 1] = 0;
+            return 1;
+        }
+        return 0;
+    }, args, 0);
 
     if (strlen(ifname) == 0) {
         LOG_WARNING(Network, "No wireless interface found");
@@ -153,20 +150,19 @@ static std::vector<Network::ScanData> ScanWifiLinux(std::chrono::milliseconds de
 
         out.clear();
         for (auto* ws = head.result; ws; ws = ws->next) {
-            if (!ws->b.has_essid)
-                continue;
+            if (ws->b.has_essid) {
+                Network::ScanData sd{};
+                sd.ssid_len = static_cast<u8>(std::min<int>(ws->b.essid_len, 0x20));
+                std::memcpy(sd.ssid, ws->b.essid, sd.ssid_len);
+                sd.quality = QualityToPercent(range, ws);
+                sd.flags |= 1;
+                if (ws->b.has_key)
+                    sd.flags |= 2;
 
-            Network::ScanData sd{};
-            sd.ssid_len = static_cast<u8>(std::min<int>(ws->b.essid_len, 0x20));
-            std::memcpy(sd.ssid, ws->b.essid, sd.ssid_len);
-            sd.quality = QualityToPercent(range, ws);
-            sd.flags |= 1;
-            if (ws->b.has_key)
-                sd.flags |= 2;
-
-            out.emplace_back(sd);
-            char tmp[0x22]{};
-            std::memcpy(tmp, sd.ssid, sd.ssid_len);
+                out.emplace_back(sd);
+                char tmp[0x22]{};
+                std::memcpy(tmp, sd.ssid, sd.ssid_len);
+            }
         }
         have = !out.empty();
     }
@@ -174,21 +170,14 @@ static std::vector<Network::ScanData> ScanWifiLinux(std::chrono::milliseconds de
     iw_sockets_close(sock);
     return out;
 }
-#endif /* linux */
-#endif
-
+#elif defined(__FreeBSD__)
 std::vector<Network::ScanData> ScanWifiNetworks(std::chrono::milliseconds deadline) {
-#ifdef ENABLE_WIFI_SCAN
-#if defined(_WIN32)
-    return ScanWifiWin(deadline);
-#elif defined(__linux__) && !defined(ANDROID)
-    return ScanWifiLinux(deadline);
-#else
-    return {}; // unsupported host, pretend no results
-#endif
+    return {}; // disabled, pretend no results
+}
 #else
+std::vector<Network::ScanData> ScanWifiNetworks(std::chrono::milliseconds deadline) {
     return {}; // disabled, pretend no results
-#endif
 }
+#endif
 
 } // namespace Network
diff --git a/src/core/internal_network/wifi_scanner_dummy.cpp b/src/core/internal_network/wifi_scanner_dummy.cpp
new file mode 100644
index 0000000000..ebc66b2e41
--- /dev/null
+++ b/src/core/internal_network/wifi_scanner_dummy.cpp
@@ -0,0 +1,11 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include <chrono>
+#include "core/internal_network/wifi_scanner.h"
+
+namespace Network {
+std::vector<Network::ScanData> ScanWifiNetworks(std::chrono::milliseconds deadline) {
+    return {}; // disabled, pretend no results
+}
+} // namespace Network