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sensor.go
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sensor.go
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/*
* NETCAP - Traffic Analysis Framework
* Copyright (c) 2017 Philipp Mieden <dreadl0ck [at] protonmail [dot] ch>
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package main
import (
"bytes"
"compress/gzip"
"context"
"encoding/hex"
"flag"
"fmt"
"io/ioutil"
"os"
"github.com/dreadl0ck/cryptoutils"
"github.com/dreadl0ck/netcap"
"github.com/dreadl0ck/netcap/collector"
"github.com/dreadl0ck/netcap/encoder"
"github.com/dreadl0ck/netcap/types"
"github.com/gogo/protobuf/proto"
)
var (
flagInterface = flag.String("iface", "en0", "interface")
flagMaxSize = flag.Int("max", 10*1024, "max size of packet") // max 65,507 bytes
flagBPF = flag.String("bpf", "", "supply a BPF filter to use for netcap collection")
flagInclude = flag.String("include", "", "include specific encoders")
flagExclude = flag.String("exclude", "", "exclude specific encoders")
flagEncoders = flag.Bool("encoders", false, "show all available encoders")
flagWorkers = flag.Int("workers", 100, "number of encoder routines")
flagPacketBuffer = flag.Int("pbuf", 0, "set packet buffer size")
flagPromiscMode = flag.Bool("promisc", true, "capture live in promisc mode")
flagSnapLen = flag.Int("snaplen", 1024, "configure snaplen for live capture")
flagServerPubKey = flag.String("pubkey", "", "path to the hex encoded server public key on disk")
flagAddr = flag.String("addr", "127.0.0.1:1335", "specify the address and port of the collection server")
)
func main() {
// parse command-line flags
flag.Parse()
// no server public key specified - no party
if *flagServerPubKey == "" {
fmt.Println("need public key of server")
os.Exit(1)
}
// read server public key contents from file
pubKeyContents, err := ioutil.ReadFile(*flagServerPubKey)
if err != nil {
panic(err)
}
// decode server public key
var serverPubKey [cryptoutils.KeySize]byte
_, err = hex.Decode(serverPubKey[:], pubKeyContents)
if err != nil {
panic(err)
}
if *flagEncoders {
encoder.ShowEncoders()
return
}
// create keypair
pub, priv, err := cryptoutils.GenerateKeypair()
if err != nil {
panic(err)
}
// init collector
c := collector.New(collector.Config{
Live: true,
Workers: *flagWorkers,
PacketBufferSize: *flagPacketBuffer,
WriteUnknownPackets: false,
Promisc: *flagPromiscMode,
SnapLen: *flagSnapLen,
EncoderConfig: encoder.Config{
// needs to be disabled for batch mode
Buffer: false,
Compression: false,
CSV: false,
IncludeEncoders: *flagInclude,
ExcludeEncoders: *flagExclude,
Out: "",
Version: netcap.Version,
Source: *flagInterface,
// set channel writer
WriteChan: true,
},
})
// initialize batching
chans, handle := c.InitBatching(*flagMaxSize, *flagBPF, *flagInterface)
// close handle on exit
defer handle.Close()
// get client id
// currently the user name is used for this
// TODO: generate a unique numerical identifier instead
var userName = os.Getenv("USER")
fmt.Println("\n["+userName+"] got", len(chans), "channels")
// iterate over encoder channels
for _, bi := range chans {
// create a copy of loop variable
info := collector.BatchInfo{
Type: bi.Type,
Chan: bi.Chan,
}
// handle channel goroutine
go func() {
var leftOverBuf []byte
// send data loop
for {
var (
b = &types.Batch{}
size []byte
)
// set clientID and messageType
b.ClientID = userName
b.MessageType = info.Type
// if there is buffered data left over
if len(leftOverBuf) > 0 {
// add to current batch
b.Data = append(b.Data, leftOverBuf...)
b.Size = int32(len(leftOverBuf))
// reset leftover buffer
leftOverBuf = make([]byte, 0)
}
// read chan loop
for {
select {
case data := <-info.Chan:
// message complete
if len(size) != 0 {
fmt.Println("got", len(data), "bytes of type", info.Type, "expected", size)
// calculate new size
newSize := int32(len(size)+len(data)) + b.Size
// if the new size would exceed the maximum size
if newSize > int32(*flagMaxSize) {
// buffer and break from loop
leftOverBuf = append(size, data...)
goto send
}
// collect data
b.Data = append(b.Data, append(size, data...)...)
// update batch size
b.Size = newSize
// reset size slice
size = []byte{}
continue
}
// received a size as varint
fmt.Println("got size", data, "for type", info.Type)
// set the size value
size = data
}
}
send: // send batch to collection server
fmt.Println("\nBatch done!", b.Size, len(b.Data), b.ClientID, b.MessageType)
// marshal batch
d, err := proto.Marshal(b)
if err != nil {
panic(err)
}
// compress data
var buf bytes.Buffer
gw := gzip.NewWriter(&buf)
_, err = gw.Write(d)
if err != nil {
panic(err)
}
// flush compressed writer
err = gw.Flush()
if err != nil {
panic(err)
}
// close compressed writer
err = gw.Close()
if err != nil {
panic(err)
}
// encrypt payload
encData, err := cryptoutils.AsymmetricEncrypt(buf.Bytes(), &serverPubKey, priv)
if err != nil {
panic(err)
}
// create a buffer for the encrypted bytes
var encB bytes.Buffer
// write public key
encB.Write(pub[:])
// write encrypted data
encB.Write(encData)
// send to server
err = sendUDP(context.Background(), *flagAddr, &encB)
if err != nil {
panic(err)
}
}
}()
}
// wait until the end of time
wait := make(chan bool)
<-wait
}