Add STUN server test to snowflake tests

README

@@ -2,10 +2,15 @@ Prerequesites:
 #Python 3 and related packages
 apt install python python3-pip
 pip3 install stem
+Golang 1.13+
 
 #obfs4 and tor
 apt install obfs4proxy tor torsocks
 
+#build scripts
+cd stun-test
+go build
+
 [SITENAME] is an arbitrary identifier for the probe site
 that you have to choose.
 

probetest.sh

@@ -20,6 +20,10 @@ case $CASE in
         "$dirname/obfs4test" "$dirname/bridge_lines.txt"
         ;;
     'snowflake')
+        # First test reachability of STUN servers
+        "$dirname/stun-test/stun-test"
+        # Throughput/reachibility test of 100 snowflakes
         "$dirname/snowflaketest"
+        # Process .pcap files and delete
         ;;
 esac

stun-test/stun-test.go

+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+
+	"github.com/pion/stun"
+)
+
+var defaultSTUNServers = []string{
+	"stun.l.google.com:19302",
+	"stun.voip.blackberry.com:3478",
+	"stun.altar.com.pl:3478",
+	"stun.antisip.com:3478",
+	"stun.bluesip.net:3478",
+	"stun.dus.net:3478",
+	"stun.epygi.com:3478",
+	"stun.sonetel.com:3478",
+	"stun.sonetel.net:3478",
+	"stun.stunprotocol.org:3478",
+	"stun.uls.co.za:3478",
+	"stun.voipgate.com:3478",
+	"stun.voys.nl:3478",
+}
+
+func main() {
+	flag.Usage = func() {
+		fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
+		fmt.Fprintln(os.Stderr, os.Args[0], "[path]")
+	}
+	flag.Parse()
+	path := flag.Arg(0)
+	if path == "" {
+		path = "."
+	}
+	path = fmt.Sprintf("%s/stun-test.csv", path)
+
+	f, err := os.OpenFile(path, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0600)
+	if err != nil {
+		panic(err)
+	}
+
+	for _, server := range defaultSTUNServers {
+		res := testServer(server)
+		if _, err := f.Write([]byte(res)); err != nil {
+			panic(err)
+		}
+
+	}
+	f.Close()
+}
+
+func testServer(addr string) string {
+	c, err := stun.Dial("udp", addr)
+	if err != nil {
+		return fmt.Sprintf("%s,false,dial,%s\n", addr, err.Error())
+	}
+	if err = c.Do(stun.MustBuild(stun.TransactionID, stun.BindingRequest), func(res stun.Event) {
+		if res.Error != nil {
+			return
+		}
+		var xorAddr stun.XORMappedAddress
+		if getErr := xorAddr.GetFrom(res.Message); getErr != nil {
+			return
+		}
+		fmt.Println(xorAddr)
+	}); err != nil {
+		return fmt.Sprintf("%s,false,request,%s\n", addr, err.Error())
+	}
+	c.Close()
+	return fmt.Sprintf("%s,true,,\n", addr)
+}