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IPPCapPacketStream.go
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IPPCapPacketStream.go
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/*====================================================================
Copyright 2013 Southfork Security, Inc.
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 main
import (
"errors"
"fmt"
"io/ioutil"
"time"
)
type IPPcapStream struct {
pcapHandle *Pcap
die bool
status bool
dieReason error
dumper PcapFileWriter
}
func (ipcs *IPPcapStream) Init(device string, snaplen int, promisc bool, timeout uint32, filter string, dumpUnparsable bool) error {
sniffDev, err := OpenActiveDevice(*dev, DEFAULT_SNAPLEN, true, 1000, filter)
if err != nil {
return errors.New(fmt.Sprintf("Failed to open active device: %v", err))
}
ipcs.pcapHandle = sniffDev
if dumpUnparsable {
fout, err := ioutil.TempFile("/tmp/", "IPPcapStreamDump")
if err != nil {
return err
}
ipcs.dumper.Init(fout, true)
} else {
ipcs.dumper.Init(nil, false)
}
return nil
}
func (ipcs *IPPcapStream) MainFeederLoop(flowManagerProducerChan chan FlowItem) {
ipcs.die = false
ipcs.status = true
ipcs.dieReason = nil
var pkt *Packet = nil
var err error
for pkt, err = ipcs.pcapHandle.Next(); err == nil && ipcs.die == false; pkt, err = ipcs.pcapHandle.Next() {
if pkt == nil {
continue
}
err := pkt.Parse()
if err != nil {
ipcs.dumper.WritePacket(pkt)
continue
}
if pkt.Type == IP4_TYPE {
var ipv4flow IPv4Flow
ipv4flow.ImportPacket(pkt)
var flowItem FlowItem = &ipv4flow
flowManagerProducerChan <- flowItem
} else if pkt.Type == IP6_TYPE {
if *verbose {
fmt.Printf("Got IPv6 packet, skipping\n")
}
continue
} else {
if *verbose {
fmt.Printf("Got non IP packet of type 0x%04x, skipping\n", pkt.Type)
}
ipcs.dumper.WritePacket(pkt)
continue
}
}
if pkt == nil {
ipcs.dieReason = errors.New(fmt.Sprintf("Got a nil packet, so probably lost handle on libpcap"))
} else {
ipcs.dieReason = nil
}
ipcs.status = false
fmt.Println("Good bye")
}
func (ipcs *IPPcapStream) Status() (bool, error) {
if ipcs.status {
return true, nil
}
return false, ipcs.dieReason
}
func (ipcs *IPPcapStream) Stop() error {
ipcs.die = true
for ipcs.status == true {
time.Sleep(10 * time.Millisecond)
}
ipcs.pcapHandle.Close()
return ipcs.dieReason
}