add list-ciphers option

auth.go

@@ -1,16 +1,16 @@
 package main
 
 import (
-    "os"
+	"bufio"
+	"crypto/subtle"
+	"encoding/base64"
+	"errors"
+	"golang.org/x/crypto/bcrypt"
 	"net/http"
 	"net/url"
-    "errors"
-    "strings"
+	"os"
 	"strconv"
-    "encoding/base64"
-    "crypto/subtle"
-    "golang.org/x/crypto/bcrypt"
-    "bufio"
+	"strings"
 )
 
 const AUTH_REQUIRED_MSG = "Proxy authentication required.\n"
@@ -188,7 +188,6 @@ func (_ NoAuth) Validate(wr http.ResponseWriter, req *http.Request) bool {
 	return true
 }
 
-
 type CertAuth struct{}
 
 func (_ CertAuth) Validate(wr http.ResponseWriter, req *http.Request) bool {

condlog.go

@@ -1,8 +1,8 @@
 package main
 
 import (
-    "log"
 	"fmt"
+	"log"
 )
 
 const (

handler.go

@@ -1,13 +1,13 @@
 package main
 
 import (
-    "net"
+	"context"
 	"fmt"
-    "time"
+	"net"
 	"net/http"
 	"strings"
-    "context"
 	"sync"
+	"time"
 )
 
 type ProxyHandler struct {

logwriter.go

@@ -1,8 +1,8 @@
 package main
 
 import (
-    "io"
 	"errors"
+	"io"
 	"time"
 )
 

main.go

@@ -1,12 +1,13 @@
 package main
 
 import (
-    "log"
-    "os"
-    "fmt"
+	"crypto/tls"
 	"flag"
-    "time"
+	"fmt"
+	"log"
 	"net/http"
+	"os"
+	"time"
 )
 
 func perror(msg string) {
@@ -27,8 +28,14 @@ type CLIArgs struct {
 	verbosity         int
 	timeout           time.Duration
 	cert, key, cafile string
+	list_suites       bool
 }
 
+func list_suites() {
+	for _, cipher := range tls.CipherSuites() {
+		fmt.Println(cipher.Name)
+	}
+}
 
 func parse_args() CLIArgs {
 	var args CLIArgs
@@ -40,6 +47,7 @@ func parse_args() CLIArgs {
 	flag.StringVar(&args.cert, "cert", "", "enable TLS and use certificate")
 	flag.StringVar(&args.key, "key", "", "key for TLS certificate")
 	flag.StringVar(&args.cafile, "cafile", "", "CA file to authenticate clients with certificates")
+	flag.BoolVar(&args.list_suites, "list-ciphers", false, "list ciphersuites")
 	flag.Parse()
 	return args
 }
@@ -47,6 +55,11 @@ func parse_args() CLIArgs {
 func run() int {
 	args := parse_args()
 
+	if args.list_suites {
+		list_suites()
+		return 0
+	}
+
 	logWriter := NewLogWriter(os.Stderr)
 	defer logWriter.Close()
 

utils.go

@@ -1,17 +1,17 @@
 package main
 
 import (
-    "context"
-    "net"
-    "sync"
-    "io"
-    "time"
-    "errors"
-    "net/http"
 	"bufio"
+	"context"
 	"crypto/tls"
 	"crypto/x509"
+	"errors"
+	"io"
 	"io/ioutil"
+	"net"
+	"net/http"
+	"sync"
+	"time"
 )
 
 const COPY_BUF = 128 * 1024