net: implement network interface API for Solaris

Fixes #7177.

Change-Id: Iba6063905f4f9c6acef8aba76b55d996f186d835
Reviewed-on: https://go-review.googlesource.com/29892
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>

src/go/build/deps_test.go

@@ -298,7 +298,7 @@ var pkgDeps = map[string][]string{
 		"context", "math/rand", "os", "sort", "syscall", "time",
 		"internal/nettrace",
 		"internal/syscall/windows", "internal/singleflight", "internal/race",
-		"golang_org/x/net/route",
+		"golang_org/x/net/lif", "golang_org/x/net/route",
 	},
 
 	// NET enables use of basic network-related packages.

src/net/interface.go

@@ -10,10 +10,10 @@ import (
 	"time"
 )
 
-// BUG(mikio): On NaCl, Plan9 and Solaris, methods and functions
-// related to Interface are not implemented.
+// BUG(mikio): On NaCl and Plan9, methods and functions related to
+// Interface are not implemented.
 
-// BUG(mikio): On DragonFly BSD, NetBSD and OpenBSD, the
+// BUG(mikio): On DragonFly BSD, NetBSD, OpenBSD and Solaris, the
 // MulticastAddrs method of Interface is not implemented.
 
 var (
@@ -117,6 +117,10 @@ func InterfaceAddrs() ([]Addr, error) {
 }
 
 // InterfaceByIndex returns the interface specified by index.
+//
+// On Solaris, it returns one of the logical network interfaces
+// sharing the logical data link; for more precision use
+// InterfaceByName.
 func InterfaceByIndex(index int) (*Interface, error) {
 	if index <= 0 {
 		return nil, &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: errInvalidInterfaceIndex}

src/net/interface_solaris.go

@@ -0,0 +1,107 @@
+// Copyright 2016 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.
+
+package net
+
+import (
+	"syscall"
+
+	"golang_org/x/net/lif"
+)
+
+// 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) {
+	lls, err := lif.Links(syscall.AF_UNSPEC, "")
+	if err != nil {
+		return nil, err
+	}
+	var ift []Interface
+	for _, ll := range lls {
+		if ifindex != 0 && ifindex != ll.Index {
+			continue
+		}
+		ifi := Interface{Index: ll.Index, MTU: ll.MTU, Name: ll.Name, Flags: linkFlags(ll.Flags)}
+		if len(ll.Addr) > 0 {
+			ifi.HardwareAddr = HardwareAddr(ll.Addr)
+		}
+		ift = append(ift, ifi)
+	}
+	return ift, nil
+}
+
+const (
+	sysIFF_UP          = 0x1
+	sysIFF_BROADCAST   = 0x2
+	sysIFF_DEBUG       = 0x4
+	sysIFF_LOOPBACK    = 0x8
+	sysIFF_POINTOPOINT = 0x10
+	sysIFF_NOTRAILERS  = 0x20
+	sysIFF_RUNNING     = 0x40
+	sysIFF_NOARP       = 0x80
+	sysIFF_PROMISC     = 0x100
+	sysIFF_ALLMULTI    = 0x200
+	sysIFF_INTELLIGENT = 0x400
+	sysIFF_MULTICAST   = 0x800
+	sysIFF_MULTI_BCAST = 0x1000
+	sysIFF_UNNUMBERED  = 0x2000
+	sysIFF_PRIVATE     = 0x8000
+)
+
+func linkFlags(rawFlags int) Flags {
+	var f Flags
+	if rawFlags&sysIFF_UP != 0 {
+		f |= FlagUp
+	}
+	if rawFlags&sysIFF_BROADCAST != 0 {
+		f |= FlagBroadcast
+	}
+	if rawFlags&sysIFF_LOOPBACK != 0 {
+		f |= FlagLoopback
+	}
+	if rawFlags&sysIFF_POINTOPOINT != 0 {
+		f |= FlagPointToPoint
+	}
+	if rawFlags&sysIFF_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) {
+	var name string
+	if ifi != nil {
+		name = ifi.Name
+	}
+	as, err := lif.Addrs(syscall.AF_UNSPEC, name)
+	if err != nil {
+		return nil, err
+	}
+	var ifat []Addr
+	for _, a := range as {
+		var ip IP
+		var mask IPMask
+		switch a := a.(type) {
+		case *lif.Inet4Addr:
+			ip = IPv4(a.IP[0], a.IP[1], a.IP[2], a.IP[3])
+			mask = CIDRMask(a.PrefixLen, 8*IPv4len)
+		case *lif.Inet6Addr:
+			ip = make(IP, IPv6len)
+			copy(ip, a.IP[:])
+			mask = CIDRMask(a.PrefixLen, 8*IPv6len)
+		}
+		ifat = append(ifat, &IPNet{IP: ip, Mask: mask})
+	}
+	return ifat, nil
+}
+
+// interfaceMulticastAddrTable returns addresses for a specific
+// interface.
+func interfaceMulticastAddrTable(ifi *Interface) ([]Addr, error) {
+	return nil, nil
+}

src/net/interface_stub.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build nacl plan9 solaris
+// +build nacl plan9
 
 package net
 

src/net/interface_test.go

@@ -58,8 +58,15 @@ func TestInterfaces(t *testing.T) {
 		if err != nil {
 			t.Fatal(err)
 		}
-		if !reflect.DeepEqual(ifxi, &ifi) {
-			t.Errorf("got %v; want %v", ifxi, ifi)
+		switch runtime.GOOS {
+		case "solaris":
+			if ifxi.Index != ifi.Index {
+				t.Errorf("got %v; want %v", ifxi, ifi)
+			}
+		default:
+			if !reflect.DeepEqual(ifxi, &ifi) {
+				t.Errorf("got %v; want %v", ifxi, ifi)
+			}
 		}
 		ifxn, err := InterfaceByName(ifi.Name)
 		if err != nil {