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net: fix bug in net.Interfaces: handle elastic sdl_data size correctly

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Fixes #1921.

R=golang-dev, jeff
CC=golang-dev
https://golang.org/cl/4535120
This commit is contained in:
Mikio Hara 2011-06-07 16:06:36 -04:00 committed by Russ Cox
parent be48115f48
commit a8fd374187
1 changed files with 6 additions and 2 deletions
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8
src/pkg/net/interface_bsd.go
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@ -9,6 +9,7 @@ package net
import (
"os"
"syscall"
"unsafe"
)
// IsUp returns true if ifi is up.
@ -102,16 +103,19 @@ func newLink(m *syscall.InterfaceMessage) ([]Interface, os.Error) {
for _, s := range sas {
switch v := s.(type) {
case *syscall.SockaddrDatalink:
// NOTE: SockaddrDatalink.Data is minimum work area,
// can be larger.
m.Data = m.Data[unsafe.Offsetof(v.Data):]
ifi := Interface{Index: int(m.Header.Index), rawFlags: int(m.Header.Flags)}
var name [syscall.IFNAMSIZ]byte
for i := 0; i < int(v.Nlen); i++ {
name[i] = byte(v.Data[i])
name[i] = byte(m.Data[i])
}
ifi.Name = string(name[:v.Nlen])
ifi.MTU = int(m.Header.Data.Mtu)
addr := make([]byte, v.Alen)
for i := 0; i < int(v.Alen); i++ {
addr[i] = byte(v.Data[int(v.Nlen)+i])
addr[i] = byte(m.Data[int(v.Nlen)+i])
}
ifi.HardwareAddr = addr[:v.Alen]
ift = append(ift, ifi)