/
server.go
64 lines (50 loc) · 1.05 KB
/
server.go
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package main
import (
"fmt"
"golang.org/x/net/icmp"
"github.com/codegangsta/cli"
)
// RunServer runs server-side daemon
func RunServer(c *cli.Context) {
iface, err := CreateIface()
if err != nil {
panic(fmt.Sprintf("creating interface error: %v\n", err))
}
defer iface.Close()
conn, err := ListenICMP()
if err != nil {
panic(fmt.Sprintf("listen icmp packet error: %v\n", err))
}
defer conn.Close()
data := make(chan []byte)
go func() {
for {
buffer := make([]byte, 1522)
_, err := iface.Read(buffer)
if err == nil {
data <- buffer
}
}
}()
for {
select {
case buffer := <-data:
fmt.Println(string(buffer[:]))
}
}
}
// CreateIface creates network interface
func CreateIface() (*Interface, error) {
// creates a tap interface
iface, err := TapInterface()
if err == nil {
// set network interface ip
iface.ParseIP(10, 0, 40, 1)
iface.Up()
}
return iface, err
}
// ListenICMP listens to incoming ICMP packet
func ListenICMP() (*icmp.PacketConn, error) {
return icmp.ListenPacket("ip4:icmp", "0.0.0.0")
}