Created
August 25, 2015 16:27
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package main | |
// +build freebsd,amd64 | |
import ( | |
"C" | |
"fmt" | |
"os" | |
"syscall" | |
"unsafe" | |
) | |
func ioctl(fd, request uintptr, argp unsafe.Pointer) error { | |
if _, _, e := syscall.Syscall6(syscall.SYS_IOCTL, fd, request, uintptr(argp), 0, 0, 0); e != 0 { | |
return e | |
} | |
return nil | |
} | |
type ifrenameArg struct { | |
name [syscall.IFNAMSIZ]byte | |
data uintptr | |
} | |
func renameInterface(from, to string) error { | |
s, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_DGRAM, 0) | |
if err != nil { | |
return err | |
} | |
defer func() { | |
syscall.Close(s) | |
}() | |
var ifr ifrenameArg | |
copy(ifr.name[:], []byte(from)) | |
ifr.data = uintptr(unsafe.Pointer(C.CString(to))) | |
return ioctl(uintptr(s), syscall.SIOCSIFNAME, unsafe.Pointer(&ifr)) | |
} | |
func main() { | |
if len(os.Args) < 3 { | |
fmt.Fprintf(os.Stderr, "%s <from> <to>\n", os.Args[0]) | |
os.Exit(1) | |
} | |
if err := renameInterface(os.Args[1], os.Args[2]); err != nil { | |
fmt.Fprintf(os.Stderr, "ifrename: %s\n", err) | |
os.Exit(1) | |
} | |
os.Exit(0) | |
} |
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