mirror of
https://github.com/autc04/Retro68.git
synced 2024-12-11 19:49:32 +00:00
79 lines
1.8 KiB
Go
79 lines
1.8 KiB
Go
// 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.
|
|
|
|
// Linux socket filter
|
|
|
|
package syscall
|
|
|
|
import (
|
|
"unsafe"
|
|
)
|
|
|
|
func LsfStmt(code, k int) *SockFilter {
|
|
return &SockFilter{Code: uint16(code), K: uint32(k)}
|
|
}
|
|
|
|
func LsfJump(code, k, jt, jf int) *SockFilter {
|
|
return &SockFilter{Code: uint16(code), Jt: uint8(jt), Jf: uint8(jf), K: uint32(k)}
|
|
}
|
|
|
|
func LsfSocket(ifindex, proto int) (int, error) {
|
|
var lsall SockaddrLinklayer
|
|
s, e := Socket(AF_PACKET, SOCK_RAW, proto)
|
|
if e != nil {
|
|
return 0, e
|
|
}
|
|
p := (*[2]byte)(unsafe.Pointer(&lsall.Protocol))
|
|
p[0] = byte(proto >> 8)
|
|
p[1] = byte(proto)
|
|
lsall.Ifindex = ifindex
|
|
e = Bind(s, &lsall)
|
|
if e != nil {
|
|
Close(s)
|
|
return 0, e
|
|
}
|
|
return s, nil
|
|
}
|
|
|
|
type iflags struct {
|
|
name [IFNAMSIZ]byte
|
|
flags uint16
|
|
}
|
|
|
|
func SetLsfPromisc(name string, m bool) error {
|
|
s, e := Socket(AF_INET, SOCK_DGRAM, 0)
|
|
if e != nil {
|
|
return e
|
|
}
|
|
defer Close(s)
|
|
var ifl iflags
|
|
copy(ifl.name[:], []byte(name))
|
|
_, _, ep := Syscall(SYS_IOCTL, uintptr(s), SIOCGIFFLAGS, uintptr(unsafe.Pointer(&ifl)))
|
|
if ep != 0 {
|
|
return Errno(ep)
|
|
}
|
|
if m {
|
|
ifl.flags |= uint16(IFF_PROMISC)
|
|
} else {
|
|
ifl.flags &= ^uint16(IFF_PROMISC)
|
|
}
|
|
_, _, ep = Syscall(SYS_IOCTL, uintptr(s), SIOCSIFFLAGS, uintptr(unsafe.Pointer(&ifl)))
|
|
if ep != 0 {
|
|
return Errno(ep)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func AttachLsf(fd int, i []SockFilter) error {
|
|
var p SockFprog
|
|
p.Len = uint16(len(i))
|
|
p.Filter = (*SockFilter)(unsafe.Pointer(&i[0]))
|
|
return setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, unsafe.Pointer(&p), Socklen_t(unsafe.Sizeof(p)))
|
|
}
|
|
|
|
func DetachLsf(fd int) error {
|
|
var dummy int
|
|
return setsockopt(fd, SOL_SOCKET, SO_DETACH_FILTER, unsafe.Pointer(&dummy), Socklen_t(unsafe.Sizeof(dummy)))
|
|
}
|