wip: kcp client

6 files changed, 119 insertions, 11 deletions

diff --git a/Makefile b/Makefile
index 71c6826..6690a0e 100644
--- a/Makefile
+++ b/Makefile
@@ -12,6 +12,9 @@ build-client:
 run-client:
 	./obfsvpn-client -c ${OBFS4_CERT}
 
+run-client-kcp:
+	KCP=1 ./obfsvpn-client -c ${OBFS4_CERT}
+
 run-openvpn:
 	./scripts/run-openvpn-client.sh
 
diff --git a/client/main.go b/client/main.go
index 0c7edcc..daf6ce4 100644
--- a/client/main.go
+++ b/client/main.go
@@ -10,6 +10,8 @@ import (
 
 	"0xacab.org/leap/obfsvpn"
 	socks5 "github.com/armon/go-socks5"
+
+	"github.com/xtaci/kcp-go"
 )
 
 func main() {
@@ -49,6 +51,12 @@ func main() {
 		logger.Fatalf("cannot get dialer: %v", err)
 	}
 
+	if os.Getenv("KCP") == "1" {
+		dialer.DialFunc = func(network, address string) (net.Conn, error) {
+			return kcp.Dial(address)
+		}
+	}
+
 	socksConf := &socks5.Config{
 		Dial: dialer.Dial,
 	}
diff --git a/dialer.go b/dialer.go
index db5d7b4..a269c4f 100644
--- a/dialer.go
+++ b/dialer.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/base64"
 	"fmt"
+	"log"
 	"net"
 	"strconv"
 
@@ -43,9 +44,10 @@ type Dialer struct {
 	NodeID    *ntor.NodeID
 	PublicKey *ntor.PublicKey
 	IATMode   IATMode
+	DialFunc  func(string, string) (net.Conn, error)
 
-	ptArgs pt.Args
-	cf     base.ClientFactory
+	ptArgs        pt.Args
+	clientFactory base.ClientFactory
 }
 
 func packCert(node *ntor.NodeID, public *ntor.PublicKey) string {
@@ -92,7 +94,7 @@ func NewDialerFromCert(cert string) (*Dialer, error) {
 
 // NewDialerFromArgs creates a dialer from existing pluggable transport arguments.
 func NewDialerFromArgs(args pt.Args) (*Dialer, error) {
-	cf, err := (&obfs4.Transport{}).ClientFactory("")
+	clientFactory, err := (&obfs4.Transport{}).ClientFactory("")
 	if err != nil {
 		return nil, err
 	}
@@ -116,11 +118,12 @@ func NewDialerFromArgs(args pt.Args) (*Dialer, error) {
 		PublicKey: pub,
 		IATMode:   IATMode(iatMode),
 
-		ptArgs: args,
-		cf:     cf,
+		ptArgs:        args,
+		clientFactory: clientFactory,
 	}, nil
 }
 
+/* what is this for? ----
 // Wrap performs the ntor handshake over an existing conection.
 // Wrap ignores the underlying Dialer config.
 func (d *Dialer) Wrap(ctx context.Context, conn net.Conn) (net.Conn, error) {
@@ -128,6 +131,7 @@ func (d *Dialer) Wrap(ctx context.Context, conn net.Conn) (net.Conn, error) {
 		return conn, nil
 	})
 }
+*/
 
 // Dial creates an outbound net.Conn and performs the ntor handshake.
 func (d *Dialer) Dial(ctx context.Context, network, address string) (net.Conn, error) {
@@ -137,19 +141,26 @@ func (d *Dialer) Dial(ctx context.Context, network, address string) (net.Conn, e
 }
 
 func (d *Dialer) dial(ctx context.Context, network, address string, f func(network, address string) (net.Conn, error)) (net.Conn, error) {
-	if d.cf == nil {
-		cf, err := (&obfs4.Transport{}).ClientFactory("")
+	if d.clientFactory == nil {
+		clientFactory, err := (&obfs4.Transport{}).ClientFactory("")
 		if err != nil {
 			return nil, err
 		}
-		d.cf = cf
+		d.clientFactory = clientFactory
 	}
 	ptArgs := d.Args()
-	args, err := d.cf.ParseArgs(&ptArgs)
+	args, err := d.clientFactory.ParseArgs(&ptArgs)
 	if err != nil {
 		return nil, err
 	}
-	return d.cf.Dial(network, address, f, args)
+
+	if d.DialFunc != nil {
+		log.Println("REPLACING DIALFUNC")
+		f = d.DialFunc
+	}
+	log.Printf(">>> client factory dial. f=%v", f)
+
+	return d.clientFactory.Dial(network, address, f, args)
 }
 
 // Args returns the dialers options as pluggable transport arguments.
diff --git a/go.mod b/go.mod
index 65a7ab2..91ef2fc 100644
--- a/go.mod
+++ b/go.mod
@@ -5,6 +5,7 @@ go 1.17
 require (
 	git.torproject.org/pluggable-transports/goptlib.git v1.0.0
 	github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5
+	github.com/xtaci/kcp-go v5.4.20+incompatible
 	// Do not update obfs4 past e330d1b7024b, a backwards incompatible change was
 	// made that will break negotiation.
 	gitlab.com/yawning/obfs4.git v0.0.0-20210511220700-e330d1b7024b
@@ -12,6 +13,12 @@ require (
 
 require (
 	github.com/dchest/siphash v1.2.1 // indirect
+	github.com/klauspost/cpuid/v2 v2.0.6 // indirect
+	github.com/klauspost/reedsolomon v1.9.16 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/templexxx/cpufeat v0.0.0-20180724012125-cef66df7f161 // indirect
+	github.com/templexxx/xor v0.0.0-20191217153810-f85b25db303b // indirect
+	github.com/tjfoc/gmsm v1.4.1 // indirect
 	golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97 // indirect
 	golang.org/x/net v0.0.0-20210226172049-e18ecbb05110 // indirect
 	golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1 // indirect
diff --git a/go.sum b/go.sum
index 482ab37..6e389b9 100644
--- a/go.sum
+++ b/go.sum
@@ -1,27 +1,85 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 git.torproject.org/pluggable-transports/goptlib.git v1.0.0 h1:ElTwFFPKf/tA6x5nuIk9g49JZzS4T5WN+eTQTjqd00A=
 git.torproject.org/pluggable-transports/goptlib.git v1.0.0/go.mod h1:YT4XMSkuEXbtqlydr9+OxqFAyspUv0Gr9qhM3B++o/Q=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5 h1:0CwZNZbxp69SHPdPJAN/hZIm0C4OItdklCFmMRWYpio=
 github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5/go.mod h1:wHh0iHkYZB8zMSxRWpUBQtwG5a7fFgvEO+odwuTv2gs=
+github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
+github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
 github.com/dchest/siphash v1.2.1 h1:4cLinnzVJDKxTCl9B01807Yiy+W7ZzVHj/KIroQRvT4=
 github.com/dchest/siphash v1.2.1/go.mod h1:q+IRvb2gOSrUnYoPqHiyHXS0FOBBOdl6tONBlVnOnt4=
 github.com/dsnet/compress v0.0.1/go.mod h1:Aw8dCMJ7RioblQeTqt88akK31OvO8Dhf5JflhBbQEHo=
 github.com/dsnet/golib v0.0.0-20171103203638-1ea166775780/go.mod h1:Lj+Z9rebOhdfkVLjJ8T6VcRQv3SXugXy999NBtR9aFY=
+github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
+github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
+github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
+github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
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 golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97 h1:/UOmuWzQfxxo9UtlXMwuQU8CMgg1eZXqTRwkSQJWKOI=
 golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
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+golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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@@ -29,3 +87,24 @@ golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9sn
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
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diff --git a/scripts/run-openvpn-client.sh b/scripts/run-openvpn-client.sh
index d5be78f..8e5fafb 100755
--- a/scripts/run-openvpn-client.sh
+++ b/scripts/run-openvpn-client.sh
@@ -13,4 +13,4 @@ sudo openvpn \
     --pull-filter ignore route-ipv6 \
     --socks-proxy 127.0.0.1 8080 \
     --remote $OBFS4_ENDPOINT_IP $OBFS4_ENDPOINT_PORT \
-    --route $OBFS4_ENDPOINT 255.255.255.255 net_gateway
+    --route $OBFS4_ENDPOINT_IP 255.255.255.255 net_gateway