syscall: handle routing entry in ParseRoutingSockaddr on BSD variants

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4972053

diff --git a/src/pkg/syscall/route_bsd.go b/src/pkg/syscall/route_bsd.go
index 93e345d71736e2a7e7dae55a374863a3d4d63cf4..22a0a4f80e806775178032586f0ce63c9d49c302 100644 (file)
--- a/src/pkg/syscall/route_bsd.go
+++ b/src/pkg/syscall/route_bsd.go
@@ -72,9 +72,52 @@ type RouteMessage struct {
        Data   []byte
 }
 
-func (m *RouteMessage) sockaddr() (sas []Sockaddr) {
-       // TODO: implement this in the near future
-       return nil
+const rtaRtMask = RTA_DST | RTA_GATEWAY | RTA_NETMASK | RTA_GENMASK
+
+func (m *RouteMessage) sockaddr() []Sockaddr {
+       var (
+               af  int
+               sas [4]Sockaddr
+       )
+
+       buf := m.Data[:]
+       for i := uint(0); i < RTAX_MAX; i++ {
+               if m.Header.Addrs&rtaRtMask&(1<<i) == 0 {
+                       continue
+               }
+               rsa := (*RawSockaddr)(unsafe.Pointer(&buf[0]))
+               switch i {
+               case RTAX_DST, RTAX_GATEWAY:
+                       sa, e := anyToSockaddr((*RawSockaddrAny)(unsafe.Pointer(rsa)))
+                       if e != 0 {
+                               return nil
+                       }
+                       if i == RTAX_DST {
+                               af = int(rsa.Family)
+                       }
+                       sas[i] = sa
+               case RTAX_NETMASK, RTAX_GENMASK:
+                       switch af {
+                       case AF_INET:
+                               rsa4 := (*RawSockaddrInet4)(unsafe.Pointer(&buf[0]))
+                               sa := new(SockaddrInet4)
+                               for j := 0; rsa4.Len > 0 && j < int(rsa4.Len)-int(unsafe.Offsetof(rsa4.Addr)); j++ {
+                                       sa.Addr[j] = rsa4.Addr[j]
+                               }
+                               sas[i] = sa
+                       case AF_INET6:
+                               rsa6 := (*RawSockaddrInet6)(unsafe.Pointer(&buf[0]))
+                               sa := new(SockaddrInet6)
+                               for j := 0; rsa6.Len > 0 && j < int(rsa6.Len)-int(unsafe.Offsetof(rsa6.Addr)); j++ {
+                                       sa.Addr[j] = rsa6.Addr[j]
+                               }
+                               sas[i] = sa
+                       }
+               }
+               buf = buf[rsaAlignOf(int(rsa.Len)):]
+       }
+
+       return sas[:]
 }
 
 // InterfaceMessage represents a routing message containing