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79 lines
1.8 KiB
79 lines
1.8 KiB
// Copyright 2011 The Go Authors. All rights reserved. |
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// Use of this source code is governed by a BSD-style |
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// license that can be found in the LICENSE file. |
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// Linux socket filter |
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package unix |
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import ( |
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"syscall" |
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"unsafe" |
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) |
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func LsfStmt(code, k int) *SockFilter { |
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return &SockFilter{Code: uint16(code), K: uint32(k)} |
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} |
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func LsfJump(code, k, jt, jf int) *SockFilter { |
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return &SockFilter{Code: uint16(code), Jt: uint8(jt), Jf: uint8(jf), K: uint32(k)} |
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} |
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func LsfSocket(ifindex, proto int) (int, error) { |
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var lsall SockaddrLinklayer |
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s, e := Socket(AF_PACKET, SOCK_RAW, proto) |
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if e != nil { |
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return 0, e |
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} |
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p := (*[2]byte)(unsafe.Pointer(&lsall.Protocol)) |
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p[0] = byte(proto >> 8) |
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p[1] = byte(proto) |
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lsall.Ifindex = ifindex |
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e = Bind(s, &lsall) |
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if e != nil { |
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Close(s) |
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return 0, e |
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} |
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return s, nil |
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} |
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type iflags struct { |
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name [IFNAMSIZ]byte |
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flags uint16 |
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} |
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func SetLsfPromisc(name string, m bool) error { |
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s, e := Socket(AF_INET, SOCK_DGRAM, 0) |
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if e != nil { |
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return e |
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} |
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defer Close(s) |
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var ifl iflags |
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copy(ifl.name[:], []byte(name)) |
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_, _, ep := Syscall(SYS_IOCTL, uintptr(s), SIOCGIFFLAGS, uintptr(unsafe.Pointer(&ifl))) |
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if ep != 0 { |
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return syscall.Errno(ep) |
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} |
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if m { |
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ifl.flags |= uint16(IFF_PROMISC) |
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} else { |
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ifl.flags &= ^uint16(IFF_PROMISC) |
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} |
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_, _, ep = Syscall(SYS_IOCTL, uintptr(s), SIOCSIFFLAGS, uintptr(unsafe.Pointer(&ifl))) |
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if ep != 0 { |
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return syscall.Errno(ep) |
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} |
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return nil |
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} |
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func AttachLsf(fd int, i []SockFilter) error { |
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var p SockFprog |
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p.Len = uint16(len(i)) |
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p.Filter = (*SockFilter)(unsafe.Pointer(&i[0])) |
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return setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, unsafe.Pointer(&p), unsafe.Sizeof(p)) |
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} |
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func DetachLsf(fd int) error { |
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var dummy int |
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return setsockopt(fd, SOL_SOCKET, SO_DETACH_FILTER, unsafe.Pointer(&dummy), unsafe.Sizeof(dummy)) |
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}
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