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CaptureSession.go
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CaptureSession.go
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package main
import (
"context"
"fmt"
"github.com/google/gopacket/pcap"
"github.com/olebedev/emitter"
"github.com/therecipe/qt/widgets"
)
type CaptureSession struct {
CaptureWindow *DissectorWindow
CaptureContext *CaptureContext
IsCapturing bool
Context context.Context
CancelFunc context.CancelFunc
Name string
PacketListViewers []*PacketListViewer
HTTPViewers []*HTTPViewer
UsesInitialViewer bool
Handle *pcap.Handle
SetModel bool
}
func (session *CaptureSession) AddConversation(conv *Conversation) *PacketListViewer {
var viewer *PacketListViewer
// The very first session window will exist before packets have been captured
if !session.UsesInitialViewer {
session.UsesInitialViewer = true
viewer = session.PacketListViewers[0]
} else {
window := session.CaptureWindow
viewer = NewPacketListViewer(session.Context, window, 0)
session.PacketListViewers = append(session.PacketListViewers, viewer)
window.TabWidget.AddTab(viewer, fmt.Sprintf("Converation: %s#%d", session.Name, len(session.PacketListViewers)))
}
viewer.BindToConversation(conv)
if session.SetModel {
viewer.UpdateModel()
}
return viewer
}
func (session *CaptureSession) AddHTTPConversation(conv *HTTPConversation) *HTTPViewer {
var viewer *HTTPViewer
// TODO: Use initial viewer?
window := session.CaptureWindow
viewer = NewHTTPViewer(window, 0)
session.HTTPViewers = append(session.HTTPViewers, viewer)
window.TabWidget.AddTab(viewer, fmt.Sprintf("HTTP: %s#%d", session.Name, len(session.HTTPViewers)))
viewer.BindToConversation(conv)
return viewer
}
func (session *CaptureSession) FindViewer(viewer *widgets.QWidget) *PacketListViewer {
for _, v := range session.PacketListViewers {
// TODO: Too hacky?
if v.QWidget.Pointer() == viewer.Pointer() {
return v
}
}
return nil
}
func (session *CaptureSession) FindHTTPViewer(viewer *widgets.QWidget) *HTTPViewer {
for _, v := range session.HTTPViewers {
if v.QWidget.Pointer() == viewer.Pointer() {
return v
}
}
return nil
}
func (session *CaptureSession) StopCapture() {
session.IsCapturing = false
session.CancelFunc()
session.CaptureWindow.UpdateButtons()
}
func NewCaptureSession(name string, window *DissectorWindow) *CaptureSession {
ctx, cancelFunc := context.WithCancel(context.Background())
captureContext := NewCaptureContext()
initialViewer := NewPacketListViewer(ctx, window, 0)
session := &CaptureSession{
IsCapturing: true,
CaptureWindow: window,
CaptureContext: captureContext,
Context: ctx,
CancelFunc: cancelFunc,
Name: name,
PacketListViewers: []*PacketListViewer{initialViewer},
}
captureContext.ConversationEmitter.On("conversation", func(e *emitter.Event) {
conv := e.Args[0].(*Conversation)
MainThreadRunner.RunOnMain(func() {
session.AddConversation(conv)
window.UpdateButtons()
})
<-MainThreadRunner.Wait
}, emitter.Void)
captureContext.ConversationEmitter.On("http", func(e *emitter.Event) {
thisConv := e.Args[0].(*HTTPConversation)
MainThreadRunner.RunOnMain(func() {
session.AddHTTPConversation(thisConv)
window.UpdateButtons()
})
<-MainThreadRunner.Wait
}, emitter.Void)
// TODO: Too hacky?
captureContext.Close = func() {
if session.Handle != nil {
session.Handle.Close()
}
}
// Can't add the tab here because the session isn't on the window yet
return session
}
func (session *CaptureSession) CaptureFromHandle(handle *pcap.Handle, isIPv4 bool, progressChan chan int) error {
session.Handle = handle
return session.CaptureContext.CaptureFromHandle(session.Context, handle, isIPv4, progressChan)
}
func (session *CaptureSession) UpdateModels() {
for _, viewer := range session.PacketListViewers {
viewer.UpdateModel()
}
}
// FIXME: HTTPViewer
func (session *CaptureSession) RemoveViewer(viewer *widgets.QWidget) bool {
// TODO: Remove conversation for CaptureContext?
var index int
for i, v := range session.PacketListViewers {
// TODO: Too hacky?
if v.QWidget.Pointer() == viewer.Pointer() {
index = i
}
}
// anti-memory leak deletion
copy(session.PacketListViewers[index:], session.PacketListViewers[index+1:])
session.PacketListViewers[len(session.PacketListViewers)-1] = nil
session.PacketListViewers = session.PacketListViewers[:len(session.PacketListViewers)-1]
return len(session.PacketListViewers) == 0
}
func (session *CaptureSession) Destroy() {
if session.IsCapturing {
session.StopCapture()
}
for _, viewer := range session.PacketListViewers {
viewer.DestroyQWidget()
}
session.PacketListViewers = nil
}