// startCapturePcap starts a new capture for a specified interface on a VM,
// writing the packets to the specified filename in PCAP format.
func startCapturePcap(vm string, iface int, filename string) error {
// get the vm
v := vms.findVm(vm)
if v == nil {
return vmNotFound(vm)
}
if len(v.Taps) <= iface {
return fmt.Errorf("no such interface %v", iface)
}
tap := v.Taps[iface]
// attempt to start pcap on the bridge
p, err := gopcap.NewPCAP(tap, filename)
if err != nil {
return err
}
// success! add it to the list
ce := &capture{
ID: <-captureIDCount,
Type: "pcap",
VM: v.ID,
Interface: iface,
Path: filename,
pcap: p,
}
captureLock.Lock()
captureEntries[ce.ID] = ce
captureLock.Unlock()
return nil
}
// startBridgeCapturePcap starts a new capture for all the traffic on the
// specified bridge, writing all packets to the specified filename in PCAP
// format.
func startBridgeCapturePcap(b, filename string) error {
// create the bridge if necessary
br, err := getBridge(b)
if err != nil {
return err
}
tap, err := br.CreateMirror()
if err != nil {
return err
}
// attempt to start pcap on the mirrored tap
p, err := gopcap.NewPCAP(tap, filename)
if err != nil {
return err
}
// success! add it to the list
ce := &capture{
ID: captureID.Next(),
Type: "pcap",
Bridge: br.Name,
VM: -1,
Interface: -1,
Path: filename,
pcap: p,
tap: tap,
}
captureEntries[ce.ID] = ce
return nil
}
// startCapturePcap starts a new capture for a specified interface on a VM,
// writing the packets to the specified filename in PCAP format.
func startCapturePcap(vm string, iface int, filename string) error {
// TODO: filter by namespace?
// get the vm
v := vms.FindVM(vm)
if v == nil {
return vmNotFound(vm)
}
config := getConfig(v)
if len(config.Networks) <= iface {
return fmt.Errorf("no such interface %v", iface)
}
tap := config.Networks[iface].Tap
// attempt to start pcap on the bridge
p, err := gopcap.NewPCAP(tap, filename)
if err != nil {
return err
}
// success! add it to the list
ce := &capture{
ID: captureID.Next(),
Type: "pcap",
VM: v.GetID(),
Interface: iface,
Path: filename,
pcap: p,
}
captureEntries[ce.ID] = ce
return nil
}
// startBridgeCapturePcap starts a new capture for all the traffic on the
// specified bridge, writing all packets to the specified filename in PCAP
// format.
func startBridgeCapturePcap(bridge, filename string) error {
// create the bridge if necessary
b, err := getBridge(bridge)
if err != nil {
return err
}
tap, err := b.CreateBridgeMirror()
if err != nil {
return err
}
// attempt to start pcap on the mirrored tap
p, err := gopcap.NewPCAP(tap, filename)
if err != nil {
return err
}
// success! add it to the list
ce := &capture{
ID: <-captureIDCount,
Type: "pcap",
Bridge: bridge,
VM: -1,
Interface: -1,
Path: filename,
pcap: p,
tap: tap,
}
captureLock.Lock()
captureEntries[ce.ID] = ce
captureLock.Unlock()
return nil
}
