1 // Copyright 2014 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
5 // +build darwin dragonfly freebsd linux netbsd openbsd solaris windows
15 "golang.org/x/net/internal/iana"
16 "golang.org/x/net/ipv4"
17 "golang.org/x/net/ipv6"
20 const sysIP_STRIPHDR = 0x17 // for now only darwin supports this option
22 // ListenPacket listens for incoming ICMP packets addressed to
23 // address. See net.Dial for the syntax of address.
25 // For non-privileged datagram-oriented ICMP endpoints, network must
26 // be "udp4" or "udp6". The endpoint allows to read, write a few
27 // limited ICMP messages such as echo request and echo reply.
28 // Currently only Darwin and Linux support this.
31 // ListenPacket("udp4", "192.168.0.1")
32 // ListenPacket("udp4", "0.0.0.0")
33 // ListenPacket("udp6", "fe80::1%en0")
34 // ListenPacket("udp6", "::")
36 // For privileged raw ICMP endpoints, network must be "ip4" or "ip6"
37 // followed by a colon and an ICMP protocol number or name.
40 // ListenPacket("ip4:icmp", "192.168.0.1")
41 // ListenPacket("ip4:1", "0.0.0.0")
42 // ListenPacket("ip6:ipv6-icmp", "fe80::1%en0")
43 // ListenPacket("ip6:58", "::")
44 func ListenPacket(network, address string) (*PacketConn, error) {
48 family, proto = syscall.AF_INET, iana.ProtocolICMP
50 family, proto = syscall.AF_INET6, iana.ProtocolIPv6ICMP
52 i := last(network, ':')
55 proto = iana.ProtocolICMP
57 proto = iana.ProtocolIPv6ICMP
63 case syscall.AF_INET, syscall.AF_INET6:
64 s, err := syscall.Socket(family, syscall.SOCK_DGRAM, proto)
66 return nil, os.NewSyscallError("socket", err)
68 if runtime.GOOS == "darwin" && family == syscall.AF_INET {
69 if err := syscall.SetsockoptInt(s, iana.ProtocolIP, sysIP_STRIPHDR, 1); err != nil {
71 return nil, os.NewSyscallError("setsockopt", err)
74 sa, err := sockaddr(family, address)
79 if err := syscall.Bind(s, sa); err != nil {
81 return nil, os.NewSyscallError("bind", err)
83 f := os.NewFile(uintptr(s), "datagram-oriented icmp")
84 c, cerr = net.FilePacketConn(f)
87 c, cerr = net.ListenPacket(network, address)
93 case iana.ProtocolICMP:
94 return &PacketConn{c: c, p4: ipv4.NewPacketConn(c)}, nil
95 case iana.ProtocolIPv6ICMP:
96 return &PacketConn{c: c, p6: ipv6.NewPacketConn(c)}, nil
98 return &PacketConn{c: c}, nil