/
conn_unix.go
72 lines (64 loc) · 1.36 KB
/
conn_unix.go
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// +build darwin dragonfly freebsd linux netbsd openbsd solaris
package conn
import (
"net"
"time"
"golang.org/x/net/ipv4"
"golang.org/x/net/ipv6"
)
func setupV4Conn(c *ipv4.PacketConn) error {
err := c.SetControlMessage(ipv4.FlagDst|ipv4.FlagSrc|ipv4.FlagTTL, true)
if err != nil {
return err
}
var f ipv4.ICMPFilter
f.SetAll(true)
f.Accept(ipv4.ICMPTypeEchoReply)
err = c.SetICMPFilter(&f)
return err
}
func setupV6Conn(c *ipv6.PacketConn) error {
err := c.SetControlMessage(ipv6.FlagDst|ipv6.FlagSrc|ipv6.FlagHopLimit, true)
if err != nil {
return err
}
var f ipv6.ICMPFilter
f.SetAll(true)
f.Accept(ipv6.ICMPTypeEchoReply)
err = c.SetICMPFilter(&f)
return err
}
func readV4(c *ipv4.PacketConn, len int) (
payload []byte,
srcAddr net.Addr,
src, dst net.IP,
rlen, ttl int,
received time.Time,
err error,
) {
payload = make([]byte, len)
var cm *ipv4.ControlMessage
rlen, cm, srcAddr, err = c.ReadFrom(payload)
received = time.Now()
if cm != nil {
src, dst, ttl = cm.Src, cm.Dst, cm.TTL
}
return
}
func readV6(c *ipv6.PacketConn, len int) (
payload []byte,
srcAddr net.Addr,
src, dst net.IP,
rlen, ttl int,
received time.Time,
err error,
) {
payload = make([]byte, len)
var cm *ipv6.ControlMessage
rlen, cm, srcAddr, err = c.ReadFrom(payload)
received = time.Now()
if cm != nil {
src, dst, ttl = cm.Src, cm.Dst, cm.HopLimit
}
return
}