Add solaris/illumos support

Author: nshalman

ipc/uapi_solaris.go

@@ -0,0 +1,111 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
+ */
+
+package ipc
+
+import (
+	"net"
+	"os"
+
+	"golang.org/x/sys/unix"
+)
+
+type UAPIListener struct {
+	listener net.Listener // unix socket listener
+	connNew  chan net.Conn
+	connErr  chan error
+	evPort   *unix.EventPort
+}
+
+func (l *UAPIListener) Accept() (net.Conn, error) {
+	for {
+		select {
+		case conn := <-l.connNew:
+			return conn, nil
+
+		case err := <-l.connErr:
+			return nil, err
+		}
+	}
+}
+
+func (l *UAPIListener) Close() error {
+	err1 := l.evPort.Close()
+	err2 := l.listener.Close()
+	if err1 != nil {
+		return err1
+	}
+	return err2
+}
+
+func (l *UAPIListener) Addr() net.Addr {
+	return l.listener.Addr()
+}
+
+func UAPIListen(name string, file *os.File) (net.Listener, error) {
+	listener, err := net.FileListener(file)
+	if err != nil {
+		return nil, err
+	}
+
+	uapi := &UAPIListener{
+		listener: listener,
+		connNew:  make(chan net.Conn, 1),
+		connErr:  make(chan error, 1),
+	}
+
+	if unixListener, ok := listener.(*net.UnixListener); ok {
+		unixListener.SetUnlinkOnClose(true)
+	}
+
+	socketPath := sockPath(name)
+
+	uapi.evPort, err = unix.NewEventPort()
+	if err != nil {
+		return nil, err
+	}
+	stat, err := os.Lstat(socketPath)
+	if err != nil {
+		return nil, err
+	}
+	err = uapi.evPort.AssociatePath(socketPath, stat, unix.FILE_MODIFIED|unix.FILE_ATTRIB|unix.FILE_NOFOLLOW, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	go func(l *UAPIListener) {
+		for {
+			// start with lstat to avoid race condition
+			if _, err := os.Lstat(socketPath); os.IsNotExist(err) {
+				l.connErr <- err
+				return
+			}
+			_, perr := l.evPort.GetOne(nil)
+			if perr == unix.EINTR {
+				// If we were interrupted, resume watching.
+				continue
+			}
+			if perr != nil {
+				l.connErr <- perr
+				return
+			}
+		}
+	}(uapi)
+
+	// watch for new connections
+
+	go func(l *UAPIListener) {
+		for {
+			conn, err := l.listener.Accept()
+			if err != nil {
+				l.connErr <- err
+				break
+			}
+			l.connNew <- conn
+		}
+	}(uapi)
+
+	return uapi, nil
+}

ipc/uapi_unix.go

@@ -1,4 +1,4 @@
-//go:build linux || darwin || freebsd || openbsd
+//go:build linux || darwin || freebsd || openbsd || solaris || illumos
 
 /* SPDX-License-Identifier: MIT
  *