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utils.go
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/
utils.go
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/*
* Copyright (c) 2024 Yunshan Networks
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cmd
import (
"encoding/hex"
"flag"
"fmt"
"net"
"net/http"
"os"
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
logging "github.com/op/go-logging"
"github.com/deepflowio/deepflow/server/libs/utils"
)
const PKT_CNT_INFINITE = 0
var log = logging.MustGetLogger(os.Args[0])
var Ifname = flag.String("i", "", "Specify interface name")
var StatsInterval = flag.Int("s", 0, "Specify stats interval, unit: second")
var SrcMac = flag.String("srcMac", "", "source MAC")
var DstMac = flag.String("dstMac", "", "source MAC")
var SrcIp = flag.String("srcIp", "", "source MAC")
var DstIp = flag.String("dstIp", "", "source MAC")
var EnableProfile = flag.Bool("p", true, "if enable Profile")
var PktCount = flag.Int("c", 0, "specify receive or send packet count, default 0 stand for forever")
var LogLevel = flag.String("l", "Info", "specify log level(ingore case)"+
"[CRITICAL, ERROR, WARNING, NOTICE, INFO, DEBUG], default is INFO")
var FrameNum = flag.Uint("n", 1024, "Specify the sum of umem blocks, must be power of 2, default is 1024")
var PayloadLen = flag.Uint("L", 0, "Specify packet payload length, default is 0, packet total length = payload + 42(udp) or 54(tcp)")
var Proto = flag.String("P", "udp", "Specify ip protocol(udp or tcp), default is udp")
// increase仅对dMac, dIp有效
func GeneratePacket(sMac, dMac, sIp, dIp string, increase int) []byte {
buffer := gopacket.NewSerializeBuffer()
lays := make([]gopacket.SerializableLayer, 0, 5)
opt := gopacket.SerializeOptions{
FixLengths: true,
ComputeChecksums: false,
}
srcMac, err := net.ParseMAC(sMac)
if err != nil {
fmt.Printf("error srcMac:%v", srcMac)
}
dstMac, err := net.ParseMAC(dMac)
if err != nil {
fmt.Printf("error dstMac:%v", dstMac)
}
dstMac[5] += byte(increase)
log.Debugf("dstMac:%v", dstMac.String())
eth := layers.Ethernet{
SrcMAC: srcMac,
DstMAC: dstMac,
EthernetType: layers.EthernetTypeIPv4,
}
lays = append(lays, ð)
srcIp := net.ParseIP(sIp)
dstIp := net.ParseIP(dIp)
dstIp[15] += byte(increase)
log.Debugf("dstIp:%v", dstIp.String())
if *Proto == "udp" {
ip := layers.IPv4{
Version: 4, SrcIP: srcIp, DstIP: dstIp,
Protocol: layers.IPProtocolUDP, TTL: 64,
Checksum: 0x2222,
}
lays = append(lays, &ip)
udp := layers.UDP{
SrcPort: layers.UDPPort(1111),
DstPort: layers.UDPPort(2222),
Checksum: 0x2223,
}
udp.SetNetworkLayerForChecksum(&ip)
lays = append(lays, &udp)
} else {
ip := layers.IPv4{
Version: 4, SrcIP: srcIp, DstIP: dstIp,
Protocol: layers.IPProtocolTCP, TTL: 64,
Checksum: 0x3333,
}
lays = append(lays, &ip)
tcp := layers.TCP{
SrcPort: layers.TCPPort(3333),
DstPort: layers.TCPPort(4444),
Checksum: 0x3334,
}
tcp.SetNetworkLayerForChecksum(&ip)
lays = append(lays, &tcp)
}
payload := make([]byte, *PayloadLen)
lays = append(lays, gopacket.Payload(payload))
gopacket.SerializeLayers(buffer, opt, lays...)
pkt := buffer.Bytes()
fmt.Printf("generate packet(len:%v):\n%s", len(pkt),
hex.Dump(pkt[:utils.Min(len(pkt), 128)]))
return pkt
}
func GetPktCount(count int) int {
if count == 0 {
return PKT_CNT_INFINITE
}
return count
}
func StartProfiler() {
go func() {
if err := http.ListenAndServe("0.0.0.0:8008", nil); err != nil {
fmt.Println("Start pprof on http 0.0.0.0:8008 failed")
os.Exit(1)
}
}()
}