func main() {
stun.SetServerHost("v.mozilla.com", 3478)
nat, host, err := stun.Discover()
if err != nil {
panic(err)
}
fmt.Println(host.Ip(), nat)
}
func findNATviaStun(orig_ctx Context) (ctx Context, err error) {
ctx = orig_ctx
attempt := 0
for stunSrv, stunPort := range stunHosts {
stun.SetServerHost(stunSrv, stunPort)
nat, host, err := stun.Discover()
if err != nil {
ctx.Channels.Log <- mig.Log{Desc: fmt.Sprintf("STUN discovery failed against %s:%d with error '%v'", stunSrv, stunPort, err)}.Debug()
}
switch nat {
case stun.NAT_ERROR:
ctx.Agent.Env.NAT.Result = "Test failed"
case stun.NAT_UNKNOWN:
ctx.Agent.Env.NAT.Result = "Unexpected response from the STUN server"
case stun.NAT_BLOCKED:
ctx.Agent.Env.NAT.Result = "UDP is blocked"
case stun.NAT_FULL:
ctx.Agent.Env.NAT.Result = "Full cone NAT"
case stun.NAT_SYMETRIC:
ctx.Agent.Env.NAT.Result = "Symmetric NAT"
case stun.NAT_RESTRICTED:
ctx.Agent.Env.NAT.Result = "Restricted NAT"
case stun.NAT_PORT_RESTRICTED:
ctx.Agent.Env.NAT.Result = "Port restricted NAT"
case stun.NAT_NONE:
ctx.Agent.Env.NAT.Result = "Not behind a NAT"
case stun.NAT_SYMETRIC_UDP_FIREWALL:
ctx.Agent.Env.NAT.Result = "Symmetric UDP firewall"
default:
ctx.Agent.Env.NAT.Result = "Unknown"
}
if host != nil {
ctx.Agent.Env.NAT.IP = host.Ip()
ctx.Agent.Env.NAT.StunServer = fmt.Sprintf("%s:%d", stunSrv, stunPort)
break
}
attempt++
if attempt == 3 {
ctx.Agent.Env.NAT.Result = "Attempted 3 lookups without results"
break
}
}
return
}