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input_raw.go
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input_raw.go
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package main
import (
"log"
"net"
"time"
"github.com/buger/goreplay/proto"
raw "github.com/buger/goreplay/raw_socket_listener"
)
// RAWInput used for intercepting traffic for given address
type RAWInput struct {
data chan *raw.TCPMessage
address string
expire time.Duration
quit chan bool
engine int
realIPHeader []byte
trackResponse bool
listener *raw.Listener
bpfFilter string
timestampType string
bufferSize int
}
// Available engines for intercepting traffic
const (
EngineRawSocket = 1 << iota
EnginePcap
EnginePcapFile
)
// NewRAWInput constructor for RAWInput. Accepts address with port as argument.
func NewRAWInput(address string, engine int, trackResponse bool, expire time.Duration, realIPHeader string, bpfFilter string, timestampType string, bufferSize int) (i *RAWInput) {
i = new(RAWInput)
i.data = make(chan *raw.TCPMessage)
i.address = address
i.expire = expire
i.engine = engine
i.bpfFilter = bpfFilter
i.realIPHeader = []byte(realIPHeader)
i.quit = make(chan bool)
i.trackResponse = trackResponse
i.timestampType = timestampType
i.bufferSize = bufferSize
i.listen(address)
i.listener.IsReady()
return
}
func (i *RAWInput) Read(data []byte) (int, error) {
msg := <-i.data
buf := msg.Bytes()
var header []byte
if msg.IsIncoming {
header = payloadHeader(RequestPayload, msg.UUID(), msg.Start.UnixNano(), -1)
if len(i.realIPHeader) > 0 {
buf = proto.SetHeader(buf, i.realIPHeader, []byte(msg.IP().String()))
}
} else {
header = payloadHeader(ResponsePayload, msg.UUID(), msg.Start.UnixNano(), msg.End.UnixNano()-msg.AssocMessage.End.UnixNano())
}
copy(data[0:len(header)], header)
copy(data[len(header):], buf)
return len(buf) + len(header), nil
}
func (i *RAWInput) listen(address string) {
Debug("Listening for traffic on: " + address)
host, port, err := net.SplitHostPort(address)
if err != nil {
log.Fatal("input-raw: error while parsing address", err)
}
i.listener = raw.NewListener(host, port, i.engine, i.trackResponse, i.expire, i.bpfFilter, i.timestampType, i.bufferSize, Settings.inputRAWOverrideSnapLen, Settings.inputRAWImmediateMode)
ch := i.listener.Receiver()
go func() {
for {
select {
case <-i.quit:
return
default:
}
// Receiving TCPMessage object
m := <-ch
i.data <- m
}
}()
}
func (i *RAWInput) String() string {
return "Intercepting traffic from: " + i.address
}
func (i *RAWInput) Close() error {
i.listener.Close()
close(i.quit)
return nil
}