server: support passive md5 and ttl on *bsd

Signed-off-by: FUJITA Tomonori <[email protected]>

server/sockopt_bsd.go

@@ -0,0 +1,76 @@
+// Copyright (C) 2016 Nippon Telegraph and Telephone Corporation.
+//
+// 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.
+// +build dragonfly freebsd netbsd openbsd
+
+package server
+
+import (
+	"fmt"
+	"net"
+	"os"
+	"strings"
+	"syscall"
+	"unsafe"
+)
+
+const (
+	TCP_MD5SIG = 0x10
+)
+
+func SetTcpMD5SigSockopts(l *net.TCPListener, address string, key string) error {
+	fi, err := l.File()
+	defer fi.Close()
+
+	if err != nil {
+		return err
+	}
+
+	if l, err := net.FileListener(fi); err == nil {
+		defer l.Close()
+	}
+
+	// always enable and assumes that the configuration is done by
+	// setkey()
+	t := int32(1)
+	_, _, e := syscall.Syscall6(syscall.SYS_SETSOCKOPT, fi.Fd(),
+		uintptr(syscall.IPPROTO_TCP), uintptr(TCP_MD5SIG),
+		uintptr(unsafe.Pointer(&t)), unsafe.Sizeof(t), 0)
+	if e > 0 {
+		return e
+	}
+	return nil
+}
+
+func SetTcpTTLSockopts(conn *net.TCPConn, ttl int) error {
+	level := syscall.IPPROTO_IP
+	name := syscall.IP_TTL
+	if strings.Contains(conn.RemoteAddr().String(), "[") {
+		level = syscall.IPPROTO_IPV6
+		name = syscall.IPV6_UNICAST_HOPS
+	}
+	fi, err := conn.File()
+	defer fi.Close()
+	if err != nil {
+		return err
+	}
+	if conn, err := net.FileConn(fi); err == nil {
+		defer conn.Close()
+	}
+	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(int(fi.Fd()), level, name, ttl))
+}
+
+func DialTCPTimeoutWithMD5Sig(host string, port int, localAddr, key string, msec int) (*net.TCPConn, error) {
+	return nil, fmt.Errorf("md5 active connection unsupported")
+}