1 files changed, 182 insertions, 0 deletions
diff --git a/src/net/interface_bsd.go b/src/net/interface_bsd.go
new file mode 100644
index 000000000..16775579d
--- /dev/null
+++ b/src/net/interface_bsd.go
@@ -0,0 +1,182 @@
+// Copyright 2011 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin dragonfly freebsd netbsd openbsd
+
+package net
+
+import (
+	"os"
+	"syscall"
+	"unsafe"
+)
+
+// If the ifindex is zero, interfaceTable returns mappings of all
+// network interfaces.  Otherwise it returns a mapping of a specific
+// interface.
+func interfaceTable(ifindex int) ([]Interface, error) {
+	tab, err := syscall.RouteRIB(syscall.NET_RT_IFLIST, ifindex)
+	if err != nil {
+		return nil, os.NewSyscallError("route rib", err)
+	}
+	msgs, err := syscall.ParseRoutingMessage(tab)
+	if err != nil {
+		return nil, os.NewSyscallError("route message", err)
+	}
+	return parseInterfaceTable(ifindex, msgs)
+}
+
+func parseInterfaceTable(ifindex int, msgs []syscall.RoutingMessage) ([]Interface, error) {
+	var ift []Interface
+loop:
+	for _, m := range msgs {
+		switch m := m.(type) {
+		case *syscall.InterfaceMessage:
+			if ifindex == 0 || ifindex == int(m.Header.Index) {
+				ifi, err := newLink(m)
+				if err != nil {
+					return nil, err
+				}
+				ift = append(ift, *ifi)
+				if ifindex == int(m.Header.Index) {
+					break loop
+				}
+			}
+		}
+	}
+	return ift, nil
+}
+
+func newLink(m *syscall.InterfaceMessage) (*Interface, error) {
+	sas, err := syscall.ParseRoutingSockaddr(m)
+	if err != nil {
+		return nil, os.NewSyscallError("route sockaddr", err)
+	}
+	ifi := &Interface{Index: int(m.Header.Index), Flags: linkFlags(m.Header.Flags)}
+	for _, sa := range sas {
+		switch sa := sa.(type) {
+		case *syscall.SockaddrDatalink:
+			// NOTE: SockaddrDatalink.Data is minimum work area,
+			// can be larger.
+			m.Data = m.Data[unsafe.Offsetof(sa.Data):]
+			var name [syscall.IFNAMSIZ]byte
+			for i := 0; i < int(sa.Nlen); i++ {
+				name[i] = byte(m.Data[i])
+			}
+			ifi.Name = string(name[:sa.Nlen])
+			ifi.MTU = int(m.Header.Data.Mtu)
+			addr := make([]byte, sa.Alen)
+			for i := 0; i < int(sa.Alen); i++ {
+				addr[i] = byte(m.Data[int(sa.Nlen)+i])
+			}
+			ifi.HardwareAddr = addr[:sa.Alen]
+		}
+	}
+	return ifi, nil
+}
+
+func linkFlags(rawFlags int32) Flags {
+	var f Flags
+	if rawFlags&syscall.IFF_UP != 0 {
+		f |= FlagUp
+	}
+	if rawFlags&syscall.IFF_BROADCAST != 0 {
+		f |= FlagBroadcast
+	}
+	if rawFlags&syscall.IFF_LOOPBACK != 0 {
+		f |= FlagLoopback
+	}
+	if rawFlags&syscall.IFF_POINTOPOINT != 0 {
+		f |= FlagPointToPoint
+	}
+	if rawFlags&syscall.IFF_MULTICAST != 0 {
+		f |= FlagMulticast
+	}
+	return f
+}
+
+// If the ifi is nil, interfaceAddrTable returns addresses for all
+// network interfaces.  Otherwise it returns addresses for a specific
+// interface.
+func interfaceAddrTable(ifi *Interface) ([]Addr, error) {
+	index := 0
+	if ifi != nil {
+		index = ifi.Index
+	}
+	tab, err := syscall.RouteRIB(syscall.NET_RT_IFLIST, index)
+	if err != nil {
+		return nil, os.NewSyscallError("route rib", err)
+	}
+	msgs, err := syscall.ParseRoutingMessage(tab)
+	if err != nil {
+		return nil, os.NewSyscallError("route message", err)
+	}
+	var ift []Interface
+	if index == 0 {
+		ift, err = parseInterfaceTable(index, msgs)
+		if err != nil {
+			return nil, err
+		}
+	}
+	var ifat []Addr
+	for _, m := range msgs {
+		switch m := m.(type) {
+		case *syscall.InterfaceAddrMessage:
+			if index == 0 || index == int(m.Header.Index) {
+				if index == 0 {
+					var err error
+					ifi, err = interfaceByIndex(ift, int(m.Header.Index))
+					if err != nil {
+						return nil, err
+					}
+				}
+				ifa, err := newAddr(ifi, m)
+				if err != nil {
+					return nil, err
+				}
+				if ifa != nil {
+					ifat = append(ifat, ifa)
+				}
+			}
+		}
+	}
+	return ifat, nil
+}
+
+func newAddr(ifi *Interface, m *syscall.InterfaceAddrMessage) (Addr, error) {
+	sas, err := syscall.ParseRoutingSockaddr(m)
+	if err != nil {
+		return nil, os.NewSyscallError("route sockaddr", err)
+	}
+	ifa := &IPNet{}
+	for i, sa := range sas {
+		switch sa := sa.(type) {
+		case *syscall.SockaddrInet4:
+			switch i {
+			case 0:
+				ifa.Mask = IPv4Mask(sa.Addr[0], sa.Addr[1], sa.Addr[2], sa.Addr[3])
+			case 1:
+				ifa.IP = IPv4(sa.Addr[0], sa.Addr[1], sa.Addr[2], sa.Addr[3])
+			}
+		case *syscall.SockaddrInet6:
+			switch i {
+			case 0:
+				ifa.Mask = make(IPMask, IPv6len)
+				copy(ifa.Mask, sa.Addr[:])
+			case 1:
+				ifa.IP = make(IP, IPv6len)
+				copy(ifa.IP, sa.Addr[:])
+				// NOTE: KAME based IPv6 protcol stack usually embeds
+				// the interface index in the interface-local or link-
+				// local address as the kernel-internal form.
+				if ifa.IP.IsLinkLocalUnicast() {
+					ifa.IP[2], ifa.IP[3] = 0, 0
+				}
+			}
+		default: // Sockaddrs contain syscall.SockaddrDatalink on NetBSD
+			return nil, nil
+		}
+	}
+	return ifa, nil
+}