Add OpenBSD support in System.Net.NetworkInformation

src/libraries/System.Net.NetworkInformation/src/System.Net.NetworkInformation.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>$(NetCoreAppCurrent)-windows;$(NetCoreAppCurrent)-linux;$(NetCoreAppCurrent)-android;$(NetCoreAppCurrent)-osx;$(NetCoreAppCurrent)-ios;$(NetCoreAppCurrent)-tvos;$(NetCoreAppCurrent)-freebsd;$(NetCoreAppCurrent)-illumos;$(NetCoreAppCurrent)-solaris;$(NetCoreAppCurrent)-haiku;$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFrameworks>$(NetCoreAppCurrent)-windows;$(NetCoreAppCurrent)-linux;$(NetCoreAppCurrent)-android;$(NetCoreAppCurrent)-osx;$(NetCoreAppCurrent)-ios;$(NetCoreAppCurrent)-tvos;$(NetCoreAppCurrent)-freebsd;$(NetCoreAppCurrent)-openbsd;$(NetCoreAppCurrent)-illumos;$(NetCoreAppCurrent)-solaris;$(NetCoreAppCurrent)-haiku;$(NetCoreAppCurrent)</TargetFrameworks>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <UseCompilerGeneratedDocXmlFile>false</UseCompilerGeneratedDocXmlFile>
   </PropertyGroup>
@@ -166,8 +166,8 @@
     <Compile Include="System\Net\NetworkInformation\NetworkAddressChange.Android.cs" />
   </ItemGroup>
 
-  <!-- OSX -->
-  <ItemGroup Condition="'$(TargetPlatformIdentifier)' == 'osx' or '$(TargetPlatformIdentifier)' == 'ios' or '$(TargetPlatformIdentifier)' == 'tvos' or '$(TargetPlatformIdentifier)' == 'freebsd'">
+  <!-- OSX/FreeBSD/OpenBSD -->
+  <ItemGroup Condition="'$(TargetPlatformIdentifier)' == 'osx' or '$(TargetPlatformIdentifier)' == 'ios' or '$(TargetPlatformIdentifier)' == 'tvos' or '$(TargetPlatformIdentifier)' == 'freebsd' or '$(TargetPlatformIdentifier)' == 'openbsd'">
     <Compile Include="System\Net\NetworkInformation\IPGlobalPropertiesPal.Bsd.cs" />
     <Compile Include="System\Net\NetworkInformation\NetworkInterfacePal.Bsd.cs" />
     <Compile Include="System\Net\NetworkInformation\BsdIcmpV4Statistics.cs" />
@@ -201,7 +201,7 @@
     <Compile Include="$(CommonPath)Interop\FreeBSD\Interop.Libraries.cs" Link="Common\Interop\FreeBSD\Interop.Libraries.cs" />
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetPlatformIdentifier)' == 'linux' or '$(TargetPlatformIdentifier)' == 'freebsd'">
+  <ItemGroup Condition="'$(TargetPlatformIdentifier)' == 'linux' or '$(TargetPlatformIdentifier)' == 'freebsd' or '$(TargetPlatformIdentifier)' == 'openbsd'">
     <Compile Include="System\Net\NetworkInformation\NetworkAddressChange.Unix.cs" />
     <Compile Include="$(CommonPath)Interop\Unix\System.Native\Interop.NetworkChange.cs" Link="Common\Interop\Unix\System.Native\Interop.NetworkChange.cs" />
   </ItemGroup>

src/libraries/System.Net.NetworkInformation/src/System/Net/NetworkInformation/BsdIPGlobalProperties.cs

@@ -10,6 +10,12 @@ internal sealed class BsdIPGlobalProperties : UnixIPGlobalProperties
         private unsafe TcpConnectionInformation[] GetTcpConnections(bool listeners)
         {
             int realCount = Interop.Sys.GetEstimatedTcpConnectionCount();
+            if (realCount == -1)
+            {
+                // The platform (e.g. OpenBSD) does not expose the TCP connection table.
+                throw new PlatformNotSupportedException(SR.net_InformationUnavailableOnPlatform);
+            }
+
             int infoCount = realCount * 2;
             Interop.Sys.NativeTcpConnectionInformation[] infos = new Interop.Sys.NativeTcpConnectionInformation[infoCount];
             fixed (Interop.Sys.NativeTcpConnectionInformation* infosPtr = infos)
@@ -70,6 +76,12 @@ public override IPEndPoint[] GetActiveTcpListeners()
         public override unsafe IPEndPoint[] GetActiveUdpListeners()
         {
             int realCount = Interop.Sys.GetEstimatedUdpListenerCount();
+            if (realCount == -1)
+            {
+                // The platform (e.g. OpenBSD) does not expose the UDP listener table.
+                throw new PlatformNotSupportedException(SR.net_InformationUnavailableOnPlatform);
+            }
+
             int infoCount = realCount * 2;
             Interop.Sys.IPEndPointInfo[] infos = new Interop.Sys.IPEndPointInfo[infoCount];
             fixed (Interop.Sys.IPEndPointInfo* infosPtr = infos)

src/libraries/System.Net.NetworkInformation/tests/FunctionalTests/IPGlobalPropertiesTest.cs

@@ -34,6 +34,7 @@ public IPGlobalPropertiesTest(ITestOutputHelper output)
 
         [Fact]
         [SkipOnPlatform(TestPlatforms.Android, "Expected behavior is different on Android")]
+        [SkipOnPlatform(TestPlatforms.OpenBSD, "TCP/UDP connection enumeration is unsupported on OpenBSD")]
         public void IPGlobalProperties_AccessAllMethods_NoErrors()
         {
             IPGlobalProperties gp = IPGlobalProperties.GetIPGlobalProperties();
@@ -129,6 +130,7 @@ public void IPGlobalProperties_IPv4_IPv6_NoErrors_Android(int ipVersion)
         [Theory]
         [MemberData(nameof(Loopbacks))]
         [SkipOnPlatform(TestPlatforms.Android, "Unsupported on Android")]
+        [SkipOnPlatform(TestPlatforms.OpenBSD, "TCP connection enumeration is unsupported on OpenBSD")]
         public void IPGlobalProperties_TcpListeners_Succeed(IPAddress address)
         {
             using (var server = new Socket(address.AddressFamily, SocketType.Stream, ProtocolType.Tcp))
@@ -145,6 +147,7 @@ public void IPGlobalProperties_TcpListeners_Succeed(IPAddress address)
         [Theory]
         [MemberData(nameof(Loopbacks))]
         [SkipOnPlatform(TestPlatforms.Android, "Unsupported on Android")]
+        [SkipOnPlatform(TestPlatforms.OpenBSD, "UDP listener enumeration is unsupported on OpenBSD")]
         public void IPGlobalProperties_UdpListeners_Succeed(IPAddress address)
         {
             using (var server = new Socket(address.AddressFamily, SocketType.Dgram, ProtocolType.Udp))
@@ -158,7 +161,7 @@ public void IPGlobalProperties_UdpListeners_Succeed(IPAddress address)
         }
 
         [Theory]
-        [PlatformSpecific(~(TestPlatforms.iOS | TestPlatforms.tvOS | TestPlatforms.Android))]
+        [PlatformSpecific(~(TestPlatforms.iOS | TestPlatforms.tvOS | TestPlatforms.Android | TestPlatforms.OpenBSD))]
         [MemberData(nameof(Loopbacks))]
         public async Task IPGlobalProperties_TcpActiveConnections_Succeed(IPAddress address)
         {
@@ -190,6 +193,7 @@ public async Task IPGlobalProperties_TcpActiveConnections_Succeed(IPAddress addr
 
         [Fact]
         [SkipOnPlatform(TestPlatforms.Android, "Unsupported on Android")]
+        [SkipOnPlatform(TestPlatforms.OpenBSD, "TCP connection enumeration is unsupported on OpenBSD")]
         public void IPGlobalProperties_TcpActiveConnections_NotListening()
         {
             TcpConnectionInformation[] tcpCconnections = IPGlobalProperties.GetIPGlobalProperties().GetActiveTcpConnections();

src/libraries/System.Net.NetworkInformation/tests/FunctionalTests/NetworkInterfaceBasicTest.cs

@@ -276,7 +276,7 @@ public void BasicTest_GetIsNetworkAvailable_Success()
         }
 
         [ConditionalTheory]
-        [SkipOnPlatform(TestPlatforms.OSX | TestPlatforms.FreeBSD, "Expected behavior is different on OSX or FreeBSD")]
+        [SkipOnPlatform(TestPlatforms.OSX | TestPlatforms.FreeBSD | TestPlatforms.OpenBSD, "Expected behavior is different on OSX, FreeBSD, or OpenBSD")]
         [SkipOnPlatform(TestPlatforms.iOS | TestPlatforms.MacCatalyst | TestPlatforms.tvOS, "Not supported on Browser, iOS, MacCatalyst, or tvOS.")]
         [InlineData(false)]
         [InlineData(true)]

src/libraries/System.Net.Sockets/src/System/Net/Sockets/Socket.cs

@@ -261,7 +261,8 @@ private static SafeSocketHandle ValidateHandle(SafeSocketHandle handle)
         public static bool OSSupportsIPv4 => SocketProtocolSupportPal.OSSupportsIPv4;
         public static bool OSSupportsIPv6 => SocketProtocolSupportPal.OSSupportsIPv6;
         [UnsupportedOSPlatformGuard("wasi")]
-        internal static bool OSSupportsIPv6DualMode => !OperatingSystem.IsWasi() && OSSupportsIPv6;
+        // OpenBSD does not support dual-mode (IPv4-mapped IPv6) sockets: setting IPV6_V6ONLY to 0 fails with EINVAL.
+        internal static bool OSSupportsIPv6DualMode => !OperatingSystem.IsWasi() && OSSupportsIPv6 && !RuntimeInformation.IsOSPlatform(OSPlatform.Create("OPENBSD"));
         [UnsupportedOSPlatformGuard("wasi")]
         internal static bool OSSupportsThreads => !OperatingSystem.IsWasi();
         public static bool OSSupportsUnixDomainSockets => SocketProtocolSupportPal.OSSupportsUnixDomainSockets;

src/native/libs/System.Native/pal_interfaceaddresses.c

@@ -174,6 +174,18 @@ int32_t SystemNative_EnumerateInterfaceAddresses(void* context,
                 memcpy_s(iai.AddressBytes, sizeof_member(IpAddressInfo, AddressBytes), sain6->sin6_addr.s6_addr, sizeof(sain6->sin6_addr.s6_addr));
                 uint32_t scopeId = sain6->sin6_scope_id;
 
+#ifdef TARGET_OPENBSD
+                // OpenBSD's KAME-derived stack embeds the scope id (interface index) in the second
+                // 16-bit word of a link-local address and leaves sin6_scope_id set to 0. Recover the
+                // scope id from the address bytes and restore the canonical link-local form.
+                if (scopeId == 0 && iai.AddressBytes[0] == 0xFE && (iai.AddressBytes[1] & 0xC0) == 0x80)
+                {
+                    scopeId = (uint32_t)((iai.AddressBytes[2] << 8) | iai.AddressBytes[3]);
+                    iai.AddressBytes[2] = 0;
+                    iai.AddressBytes[3] = 0;
+                }
+#endif
+
                 struct sockaddr_in6* mask_sain6 = (struct sockaddr_in6*)current->ifa_netmask;
                 iai.PrefixLength = mask_sain6 != NULL ? mask2prefix((uint8_t*)&mask_sain6->sin6_addr.s6_addr, NUM_BYTES_IN_IPV6_ADDRESS) : NUM_BYTES_IN_IPV6_ADDRESS * 8;
                 onIpv6Found(context, actualName, &iai, &scopeId);

src/native/libs/System.Native/pal_networking.c

@@ -3370,9 +3370,11 @@ static int32_t TryChangeSocketEventRegistrationInner(
                0,
                0,
                GetKeventUdata(data));
-#if defined(__FreeBSD__)
+#if defined(__FreeBSD__) || defined(__OpenBSD__)
         // Issue: #30698
-        // FreeBSD seems to have some issue when setting read/write events together.
+        // FreeBSD and OpenBSD have an issue when setting read/write events together
+        // in a single kevent() call: the second (write) filter is silently not armed,
+        // so connect-completion is never delivered and async connect hangs.
         // As a workaround use separate kevent() calls.
         if (writeChanged)
         {

src/native/libs/System.Native/pal_networkstatistics.c

@@ -573,6 +573,97 @@ int32_t SystemNative_GetActiveUdpListeners(IPEndPointInfo* infos, int32_t* infoC
     return 0;
 }
 
+#else
+int32_t SystemNative_GetTcpGlobalStatistics(TcpGlobalStatistics* retStats)
+{
+    (void)retStats;
+    errno = ENOTSUP;
+    return -1;
+}
+
+int32_t SystemNative_GetIPv4GlobalStatistics(IPv4GlobalStatistics* retStats)
+{
+    (void)retStats;
+    errno = ENOTSUP;
+    return -1;
+}
+
+int32_t SystemNative_GetUdpGlobalStatistics(UdpGlobalStatistics* retStats)
+{
+    (void)retStats;
+    errno = ENOTSUP;
+    return -1;
+}
+
+int32_t SystemNative_GetIcmpv4GlobalStatistics(Icmpv4GlobalStatistics* retStats)
+{
+    (void)retStats;
+    errno = ENOTSUP;
+    return -1;
+}
+
+int32_t SystemNative_GetIcmpv6GlobalStatistics(Icmpv6GlobalStatistics* retStats)
+{
+    (void)retStats;
+    errno = ENOTSUP;
+    return -1;
+}
+
+int32_t SystemNative_GetEstimatedTcpConnectionCount(void)
+{
+    errno = ENOTSUP;
+    return -1;
+}
+
+int32_t SystemNative_GetActiveTcpConnectionInfos(NativeTcpConnectionInformation* infos, int32_t* infoCount)
+{
+    (void)infos;
+    (void)infoCount;
+    errno = ENOTSUP;
+    return -1;
+}
+
+int32_t SystemNative_GetEstimatedUdpListenerCount(void)
+{
+    errno = ENOTSUP;
+    return -1;
+}
+
+int32_t SystemNative_GetActiveUdpListeners(IPEndPointInfo* infos, int32_t* infoCount)
+{
+    (void)infos;
+    (void)infoCount;
+    errno = ENOTSUP;
+    return -1;
+}
+#endif // HAVE_NETINET_TCP_VAR_H
+
+// SystemNative_GetNativeIPInterfaceStatistics and SystemNative_GetNumRoutes only require the
+// route/interface sysctl APIs (rt_msghdr), not the protocol statistics that live in tcp_var.h.
+// Gate them on HAVE_RT_MSGHDR so platforms that lack tcp_var.h but do have rt_msghdr (e.g. OpenBSD)
+// still get the real implementation instead of the ENOTSUP stub.
+#if HAVE_RT_MSGHDR
+#include <string.h>
+#include <assert.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#if HAVE_SYS_SYSCTL_H
+#include <sys/sysctl.h>
+#endif
+#include <sys/ioctl.h>
+#include <unistd.h>
+#include <net/if.h>
+#if HAVE_IOS_NET_ROUTE_H
+#include "ios/net/route.h"
+#else
+#include <net/route.h>
+#endif
+#if HAVE_NET_IFMEDIA_H
+#include <net/if_media.h>
+#elif HAVE_IOS_NET_IFMEDIA_H
+#include "ios/net/if_media.h"
+#endif
+
 int32_t SystemNative_GetNativeIPInterfaceStatistics(char* interfaceName, NativeIPInterfaceStatistics* retStats)
 {
     assert(interfaceName != NULL && retStats != NULL);
@@ -709,6 +800,7 @@ int32_t SystemNative_GetNativeIPInterfaceStatistics(char* interfaceName, NativeI
     memset(retStats, 0, sizeof(NativeIPInterfaceStatistics));
     return -1;
 }
+
 int32_t SystemNative_GetNumRoutes(void)
 {
     int32_t count = 0;
@@ -753,69 +845,6 @@ int32_t SystemNative_GetNumRoutes(void)
     return count;
 }
 #else
-int32_t SystemNative_GetTcpGlobalStatistics(TcpGlobalStatistics* retStats)
-{
-    (void)retStats;
-    errno = ENOTSUP;
-    return -1;
-}
-
-int32_t SystemNative_GetIPv4GlobalStatistics(IPv4GlobalStatistics* retStats)
-{
-    (void)retStats;
-    errno = ENOTSUP;
-    return -1;
-}
-
-int32_t SystemNative_GetUdpGlobalStatistics(UdpGlobalStatistics* retStats)
-{
-    (void)retStats;
-    errno = ENOTSUP;
-    return -1;
-}
-
-int32_t SystemNative_GetIcmpv4GlobalStatistics(Icmpv4GlobalStatistics* retStats)
-{
-    (void)retStats;
-    errno = ENOTSUP;
-    return -1;
-}
-
-int32_t SystemNative_GetIcmpv6GlobalStatistics(Icmpv6GlobalStatistics* retStats)
-{
-    (void)retStats;
-    errno = ENOTSUP;
-    return -1;
-}
-
-int32_t SystemNative_GetEstimatedTcpConnectionCount(void)
-{
-    errno = ENOTSUP;
-    return -1;
-}
-
-int32_t SystemNative_GetActiveTcpConnectionInfos(NativeTcpConnectionInformation* infos, int32_t* infoCount)
-{
-    (void)infos;
-    (void)infoCount;
-    errno = ENOTSUP;
-    return -1;
-}
-
-int32_t SystemNative_GetEstimatedUdpListenerCount(void)
-{
-    errno = ENOTSUP;
-    return -1;
-}
-
-int32_t SystemNative_GetActiveUdpListeners(IPEndPointInfo* infos, int32_t* infoCount)
-{
-    (void)infos;
-    (void)infoCount;
-    errno = ENOTSUP;
-    return -1;
-}
-
 int32_t SystemNative_GetNativeIPInterfaceStatistics(char* interfaceName, NativeIPInterfaceStatistics* retStats)
 {
     (void)interfaceName;
@@ -829,4 +858,4 @@ int32_t SystemNative_GetNumRoutes(void)
     errno = ENOTSUP;
     return -1;
 }
-#endif // HAVE_NETINET_TCP_VAR_H
+#endif // HAVE_RT_MSGHDR