/
main.go
151 lines (132 loc) · 3.49 KB
/
main.go
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package main
import (
"crypto/tls"
"crypto/x509"
"flag"
"fmt"
"io"
"log"
"net"
"sync"
"time"
)
var (
addr = ":8080"
serverTLSCert = "server.crt"
serverTLSKey = "server.key"
clientTLSCert = "client.crt"
clientTLSKey = "client.key"
)
func init() {
flag.StringVar(&addr, "addr", ":8080", "Address to listen on")
flag.StringVar(&serverTLSCert, "tls-server-cert", serverTLSCert, "Path for server TLS cert")
flag.StringVar(&serverTLSKey, "tls-server-key", serverTLSKey, "Path for server TLS key")
flag.StringVar(&clientTLSCert, "tls-client-cert", clientTLSCert, "Path for client TLS cert")
flag.StringVar(&clientTLSKey, "tls-client-key", clientTLSKey, "Path for client TLS key")
}
func main() {
flag.Parse()
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
runServer()
}()
wg.Add(1)
go func() {
defer wg.Done()
for {
runClient()
fmt.Println("")
log.Println("client: trying again 5 seconds")
time.Sleep(time.Second * 5)
}
}()
wg.Wait()
}
func runServer() {
cert, err := tls.LoadX509KeyPair(serverTLSCert, serverTLSKey)
if err != nil {
log.Fatalf("server: unable to load keys: %s", err)
}
tlsconf := &tls.Config{Certificates: []tls.Certificate{cert}}
lis, err := tls.Listen("tcp", addr, tlsconf)
if err != nil {
log.Fatalf("server: unable to start listener: %s", err)
}
log.Printf("server listening on: %s", addr)
for {
conn, err := lis.Accept()
if err != nil {
log.Fatalf("server: unable to access connections: %s", err)
}
defer conn.Close()
log.Printf("server: got request from %s", conn.RemoteAddr())
tlscon, ok := conn.(*tls.Conn)
if ok {
log.Print("server: keys verified")
state := tlscon.ConnectionState()
for _, v := range state.PeerCertificates {
pk, err := x509.MarshalPKIXPublicKey(v.PublicKey)
if err != nil {
log.Fatalf("server: unable to marshall public key %s", err)
}
log.Printf("server: public key: %s", pk)
}
}
go handleClient(conn)
}
}
func handleClient(conn net.Conn) {
defer conn.Close()
buf := make([]byte, 512)
for {
log.Print("server: conn: waiting")
n, err := conn.Read(buf)
if err != nil {
if err != nil {
log.Printf("server: conn: read: %s", err)
}
break
}
log.Printf("server: conn: echo %q\n", string(buf[:n]))
n, err = conn.Write(buf[:n])
n, err = conn.Write(buf[:n])
log.Printf("server: conn: wrote %d bytes", n)
if err != nil {
log.Printf("server: write: %s", err)
break
}
}
log.Println("server: conn: closed")
}
func runClient() {
cert, err := tls.LoadX509KeyPair(clientTLSCert, clientTLSKey)
if err != nil {
log.Fatalf("client: error loading keys: %s", err)
}
tlsconf := &tls.Config{Certificates: []tls.Certificate{cert}, InsecureSkipVerify: true}
conn, err := tls.Dial("tcp", addr, tlsconf)
if err != nil {
log.Fatalf("client: dial: %s", err)
}
defer conn.Close()
log.Println("client: connected to: ", conn.RemoteAddr())
state := conn.ConnectionState()
for _, v := range state.PeerCertificates {
fmt.Println(x509.MarshalPKIXPublicKey(v.PublicKey))
fmt.Println(v.Subject)
}
log.Println("client: handshake: ", state.HandshakeComplete)
log.Println("client: mutual: ", state.NegotiatedProtocolIsMutual)
message := "Hello\n"
n, err := io.WriteString(conn, message)
if err != nil {
log.Fatalf("client: write: %s", err)
}
log.Printf("client: wrote %q (%d bytes)", message, n)
reply := make([]byte, 256)
n, err = conn.Read(reply)
log.Printf("client: read %q (%d bytes)", string(reply[:n]), n)
log.Print("client: exiting")
}