Add BuildResponseRecord

doc/tests/header.mk

@@ -1,5 +1,5 @@
 
-test-i2np-header-all: test-i2np-type test-i2np-message test-i2np-expiration test-i2np-ntcp-components test-i2np-data test-i2np-regression
+test-i2np-header-all: test-i2np-type test-i2np-message test-i2np-expiration test-i2np-ntcp-components test-i2np-data test-i2np-regression test-i2np-build-request-record test-i2np-build-response-record
 
 test-i2np-type:
 	$(GO) test -v ./lib/i2np -run TestReadI2NPTypeWith
@@ -21,10 +21,28 @@ test-i2np-data:
 test-i2np-regression:
 	$(GO) test -v ./lib/i2np -run TestCrasherRegression123781
 
+test-i2np-build-request-record:
+	$(GO) test -v ./lib/i2np -run TestReadBuildRequestRecordReceiveTunnelTooLittleData
+	$(GO) test -v ./lib/i2np -run TestReadBuildRequestRecordReceiveTunnelValidData
+	$(GO) test -v ./lib/i2np -run TestReadBuildRequestRecordOurIdentTooLittleData
+	$(GO) test -v ./lib/i2np -run TestReadBuildRequestRecordOurIdentValidData
+
+test-i2np-build-response-record:
+	$(GO) test -v ./lib/i2np -run TestReadBuildResponseRecordHashTooLittleData
+	$(GO) test -v ./lib/i2np -run TestReadBuildResponseRecordHashValidData
+	$(GO) test -v ./lib/i2np -run TestReadBuildResponseRecordRandomDataTooLittleData
+	$(GO) test -v ./lib/i2np -run TestReadBuildResponseRecordRandomDataValidData
+	$(GO) test -v ./lib/i2np -run TestReadBuildResponseRecordReplyTooLittleData
+	$(GO) test -v ./lib/i2np -run TestReadBuildResponseRecordReplyValidData
+	$(GO) test -v ./lib/i2np -run TestReadBuildResponseRecordTooLittleData
+	$(GO) test -v ./lib/i2np -run TestReadBuildResponseRecordValidData
+
 .PHONY: test-i2np-header-all \
         test-i2np-type \
         test-i2np-message \
         test-i2np-expiration \
         test-i2np-ntcp-components \
         test-i2np-data \
-        test-i2np-regression
+        test-i2np-regression \
+        test-i2np-build-request-record \
+        test-i2np-build-response-record

lib/i2np/build_request_record.go

@@ -278,7 +278,7 @@ func readBuildRequestRecordReceiveTunnel(data []byte) (tunnel.TunnelID, error) {
 
 	log.WithFields(logrus.Fields{
 		"at":              "i2np.readBuildRequestRecordReceiveTunnel",
-		"receieve_tunnel": receive_tunnel,
+		"receive_tunnel": receive_tunnel,
 	}).Debug("parsed_build_request_record_receive_tunnel")
 	return receive_tunnel, nil
 }

lib/i2np/build_request_record_test.go

@@ -24,7 +24,7 @@ func TestReadBuildRequestRecordReceiveTunnelValidData(t *testing.T) {
 	assert.Equal(nil, err)
 }
 
-func TestReadBuildRequestRecordOurIdentTooLittleValidData(t *testing.T) {
+func TestReadBuildRequestRecordOurIdentTooLittleData(t *testing.T) {
 	assert := assert.New(t)
 
 	receive_tunnel := []byte{0x00, 0x00, 0x00, 0x01}

lib/i2np/build_response_record.go

@@ -1,13 +1,17 @@
 package i2np
 
 import (
+	"errors"
+
+	"github.com/sirupsen/logrus"
+
 	common "github.com/go-i2p/go-i2p/lib/common/data"
 )
 
 /*
 I2P I2NP BuildResponseRecord
-https://geti2p.net/spec/i2np
-Accurate for version 0.9.28
+https://geti2p.net/spec/i2np#buildresponserecord
+Accurate for version 0.9.65
 
 Encrypted:
 
@@ -43,8 +47,87 @@ type (
 	BuildResponseRecordELGamal    [528]byte
 )
 
+/*
+BuildResponseRecord struct contains a response to BuildRequestRecord
+concerning the creation of one hop in the tunnel
+*/
 type BuildResponseRecord struct {
-	Hash    common.Hash
-	Padding [495]byte
-	Reply   byte
+	Hash       common.Hash
+	RandomData [495]byte
+	Reply      byte
 }
+
+var ERR_BUILD_RESPONSE_RECORD_NOT_ENOUGH_DATA = errors.New("not enough i2np build request record data")
+
+func ReadBuildResponseRecord(data []byte) (BuildResponseRecord, error) {
+	log.Debug("Reading BuildResponseRecord")
+	build_response_record := BuildResponseRecord{}
+
+	hash, err := readBuildResponseRecordHash(data)
+	if err != nil {
+		log.WithError(err).Error("Failed to read Hash")
+		return build_response_record, err
+	}
+	build_response_record.Hash = hash
+
+	random_data, err := readBuildResponseRecordRandomData(data)
+	if err != nil {
+		log.WithError(err).Error("Failed to read Random Data")
+		return build_response_record, err
+	}
+	build_response_record.RandomData = random_data
+
+	reply, err := readBuildResponseRecordReply(data)
+	if err != nil {
+		log.WithError(err).Error("Failed to read Reply")
+		return build_response_record, err
+	}
+	build_response_record.Reply = reply
+
+	log.Debug("BuildResponseRecord read successfully")
+	return build_response_record, nil
+}
+
+func readBuildResponseRecordHash(data []byte) (common.Hash, error) {
+	if len(data) < 32 {
+		return common.Hash{}, ERR_BUILD_REQUEST_RECORD_NOT_ENOUGH_DATA
+	}
+
+	hash := common.Hash(data[0:32])
+
+	log.WithFields(logrus.Fields{
+		"at":   "i2np.readBuildResponseRecordHash",
+		"hash": hash,
+	}).Debug("parsed_build_response_record_hash")
+	return hash, nil
+}
+
+func readBuildResponseRecordRandomData(data []byte) ([495]byte, error) {
+	if len(data) < 527 {
+		return [495]byte{}, ERR_BUILD_REQUEST_RECORD_NOT_ENOUGH_DATA
+	}
+
+	random_data := [495]byte{}
+	copy(random_data[:], data[32:527])
+
+	log.WithFields(logrus.Fields{
+		"at":          "i2np.readBuildResponseRandomData",
+		"random_data": random_data,
+	}).Debug("parsed_build_response_record_random_data")
+	return random_data, nil
+}
+
+func readBuildResponseRecordReply(data []byte) (byte, error) {
+	if len(data) < 528 {
+		return byte(0), ERR_BUILD_REQUEST_RECORD_NOT_ENOUGH_DATA
+	}
+
+	reply := data[527]
+
+	log.WithFields(logrus.Fields{
+		"at":    "i2np.readBuildResponseReply",
+		"reply": reply,
+	}).Debug("parsed_build_response_record_reply")
+	return reply, nil
+}
+

lib/i2np/build_response_record_test.go

@@ -0,0 +1,117 @@
+package i2np
+
+import (
+	"testing"
+
+	common "github.com/go-i2p/go-i2p/lib/common/data"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestReadBuildResponseRecordHashTooLittleData(t *testing.T) {
+	assert := assert.New(t)
+
+	hash, err := readBuildResponseRecordHash([]byte{0x01})
+	assert.Equal(common.Hash{}, hash)
+	assert.Equal(ERR_BUILD_REQUEST_RECORD_NOT_ENOUGH_DATA, err)
+}
+
+func TestReadBuildResponseRecordHashValidData(t *testing.T) {
+	assert := assert.New(t)
+
+	data := make([]byte, 32)
+	data[31] = 0x31
+	res_hash, err := readBuildResponseRecordHash(data)
+	hash := common.Hash(data)
+
+	assert.Equal(res_hash, hash)
+	assert.Equal(nil, err)
+}
+
+func TestReadBuildResponseRecordRandomDataTooLittleData(t *testing.T) {
+	assert := assert.New(t)
+
+	hash := make([]byte, 32)
+	data := append(hash, 0x01)
+	random_data, err := readBuildResponseRecordRandomData(data)
+	assert.Equal([495]byte{}, random_data)
+	assert.Equal(ERR_BUILD_REQUEST_RECORD_NOT_ENOUGH_DATA, err)
+}
+
+func TestReadBuildResponseRecordRandomDataValidData(t *testing.T) {
+	assert := assert.New(t)
+
+	hash := make([]byte, 32) 
+	hash[31] = 0x13
+	random_data := make([]byte, 495)
+	random_data[493] = 0x33
+	random_data[494] = 0x74
+	data := append(hash, random_data...)
+	res_random_data, err := readBuildResponseRecordRandomData(data)
+	assert.Equal([495]byte(random_data), res_random_data)
+	assert.Equal(nil, err)
+}
+
+func TestReadBuildResponseRecordReplyTooLittleData(t *testing.T) {
+	assert := assert.New(t)
+
+	hash := make([]byte, 32) 
+	random_data := make([]byte, 495)
+	random_data[493] = 0x33
+	random_data[494] = 0x74
+	data := append(hash, random_data...)
+
+	res_reply, err := readBuildResponseRecordReply(data)
+	assert.Equal(byte(0), res_reply)
+	assert.Equal(ERR_BUILD_REQUEST_RECORD_NOT_ENOUGH_DATA, err)
+}
+
+
+func TestReadBuildResponseRecordReplyValidData(t *testing.T) {
+	assert := assert.New(t)
+
+	hash := make([]byte, 32) 
+	hash[31] = 0x13
+	random_data := make([]byte, 495)
+	random_data[493] = 0x33
+	random_data[494] = 0x74
+	reply := byte(37)
+	data := append(hash, random_data...)
+	data = append(data, reply)
+
+	res_reply, err := readBuildResponseRecordReply(data)
+	assert.Equal(reply, res_reply)
+	assert.Equal(nil, err)
+}
+
+func TestReadBuildResponseRecordTooLittleData(t *testing.T) {
+	assert := assert.New(t)
+
+	hash := make([]byte, 32)
+	hash[31] = 0x31
+	data := append(hash, 0x01)
+	build_response_record, err := ReadBuildResponseRecord(data)
+
+	assert.Equal(common.Hash(hash), build_response_record.Hash)
+	assert.Equal([495]byte{}, build_response_record.RandomData)
+	assert.Equal(ERR_BUILD_REQUEST_RECORD_NOT_ENOUGH_DATA, err)
+}
+
+func TestReadBuildResponseRecordValidData(t *testing.T) {
+	assert := assert.New(t)
+
+	hash := make([]byte, 32)
+	hash[31] = 0x12
+	random_data := make([]byte, 495)
+	random_data[493] = 0x33
+	random_data[494] = 0x74
+	reply := byte(37)
+	data := append(hash, random_data...)
+	data = append(data, reply)
+
+	build_response_record, err := ReadBuildResponseRecord(data)
+
+	assert.Equal(common.Hash(hash), build_response_record.Hash)
+	assert.Equal([495]byte(random_data), build_response_record.RandomData)
+	assert.Equal(reply, build_response_record.Reply)
+	assert.Equal(nil, err)
+}