fix #14872: fix incorrectly handle with two-words redis command (#14873)

Updated redis protocol decoder to support two-word commands.

Fixes #14872

CHANGELOG.next.asciidoc

@@ -37,6 +37,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 
 *Packetbeat*
 
+- Redis: fix incorrectly handle with two-words redis command. {issue}14872[14872] {pull}14873[14873] 
 
 *Winlogbeat*
 

packetbeat/protos/redis/redis_parse.go

@@ -18,6 +18,7 @@
 package redis
 
 import (
+	"bytes"
 	"time"
 
 	"github.com/elastic/beats/v7/libbeat/common"
@@ -423,11 +424,22 @@ func (p *parser) parseArray(depth int, buf *streambuf.Buffer) (common.NetString,
 	}
 
 	// handle top-level request command
-	if depth == 0 && isRedisCommand(content[0]) {
+	var oneWordCommand, twoWordsCommand bool
+	oneWordCommand = isRedisCommand(content[0])
+	twoWordsCommand = count > 1 && isRedisCommand(bytes.Join(content[0:2], []byte(" ")))
+
+	if depth == 0 && (oneWordCommand || twoWordsCommand) {
 		p.message.isRequest = true
-		p.message.method = content[0]
-		if len(content) > 1 {
-			p.message.path = content[1]
+		if oneWordCommand {
+			p.message.method = content[0]
+			if len(content) > 1 {
+				p.message.path = content[1]
+			}
+		} else if twoWordsCommand {
+			p.message.method = bytes.Join(content[0:2], []byte(" "))
+			if len(content) > 2 {
+				p.message.path = content[2]
+			}
 		}
 
 		var value common.NetString

packetbeat/protos/redis/redis_test.go

@@ -67,9 +67,31 @@ func TestRedisParser_ArrayRequest(t *testing.T) {
 	assert.True(t, complete)
 	assert.True(t, msg.isRequest)
 	assert.Equal(t, "SET key1 Hello", string(msg.message))
+	assert.Equal(t, "SET", string(msg.method))
+	assert.Equal(t, "key1", string(msg.path))
 	assert.Equal(t, len(arrayRequest), msg.size)
 }
 
+var arrayRequest2 = []byte("*3\r\n" +
+	"$6\r\n" +
+	"CONFIG\r\n" +
+	"$3\r\n" +
+	"GET\r\n" +
+	"$1\r\n" +
+	"*\r\n")
+
+func TestRedisParser_ArrayRequest2(t *testing.T) {
+	msg, ok, complete := parse(arrayRequest2)
+
+	assert.True(t, ok)
+	assert.True(t, complete)
+	assert.True(t, msg.isRequest)
+	assert.Equal(t, "CONFIG GET *", string(msg.message))
+	assert.Equal(t, "CONFIG GET", string(msg.method))
+	assert.Equal(t, "*", string(msg.path))
+	assert.Equal(t, len(arrayRequest2), msg.size)
+}
+
 var arrayResponse = []byte("*4\r\n" +
 	"$3\r\n" +
 	"foo\r\n" +