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streamui.go
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streamui.go
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// Copyright 2019 Graham Clark. All rights reserved. Use of this source
// code is governed by the MIT license that can be found in the LICENSE
// file.
// Package ui contains user-interface functions and helpers for termshark.
package ui
import (
"fmt"
"os"
"strings"
"sync"
"time"
"github.com/gcla/gowid"
"github.com/gcla/gowid/gwutil"
"github.com/gcla/gowid/widgets/holder"
"github.com/gcla/gowid/widgets/menu"
"github.com/gcla/gowid/widgets/null"
"github.com/gcla/gowid/widgets/table"
"github.com/gcla/termshark/v2"
"github.com/gcla/termshark/v2/pcap"
"github.com/gcla/termshark/v2/pdmltree"
"github.com/gcla/termshark/v2/streams"
"github.com/gcla/termshark/v2/widgets/appkeys"
"github.com/gcla/termshark/v2/widgets/streamwidget"
"github.com/gdamore/tcell"
lru "github.com/hashicorp/golang-lru"
log "github.com/sirupsen/logrus"
)
var streamViewNoKeysHolder *holder.Widget
var streamView *appkeys.KeyWidget
var conversationMenu *menu.Widget
var conversationMenuHolder *holder.Widget
var currentStreamKey *streamKey
var streamWidgets *lru.Cache // map[streamKey]*streamwidget.Widget
var StreamLoader *streams.Loader // DOC - one because it holds stream index state for pcap
//======================================================================
// The index for the stream widget cache e.g. UDP stream 6
type streamKey struct {
proto streams.Protocol
idx int
}
//======================================================================
type ManageStreamCache struct{}
var _ pcap.INewSource = ManageStreamCache{}
// Make sure that existing stream widgets are discarded if the user loads a new pcap.
func (t ManageStreamCache) OnNewSource(closeMe chan<- struct{}) {
clearStreamState()
close(closeMe)
}
//======================================================================
func streamKeyPress(evk *tcell.EventKey, app gowid.IApp) bool {
handled := false
if evk.Rune() == 'q' || evk.Rune() == 'Q' || evk.Key() == tcell.KeyEscape {
closeStreamUi(app, true)
StreamLoader.StopLoad()
handled = true
}
return handled
}
func startStreamReassembly(app gowid.IApp) {
var model *pdmltree.Model
if packetListView != nil {
if fxy, err := packetListView.FocusXY(); err == nil {
rid, _ := packetListView.Model().RowIdentifier(fxy.Row)
row := int(rid)
model = getCurrentStructModel(row)
}
}
if model == nil {
OpenError("No packets available.", app)
return
}
proto := streams.TCP
streamIndex := model.TCPStreamIndex()
if streamIndex.IsNone() {
proto = streams.UDP
streamIndex = model.UDPStreamIndex()
if streamIndex.IsNone() {
OpenError("Please select a TCP or UDP packet.", app)
return
}
}
filterProto := gwutil.If(proto == streams.TCP, "tcp", "udp").(string)
filter := fmt.Sprintf("%s.stream eq %d", filterProto, streamIndex.Val())
previousFilterValue := FilterWidget.Value()
FilterWidget.SetValue(filter, app)
PcapScheduler.RequestNewFilter(filter, MakePacketViewUpdater(app))
currentStreamKey = &streamKey{proto: proto, idx: streamIndex.Val()}
// we maintain an lru.Cache of stream widgets so that we can quickly re-open
// the UI for streams that have been calculated before.
if streamWidgets == nil {
initStreamWidgetCache()
}
var swid *streamwidget.Widget
swid2, ok := streamWidgets.Get(*currentStreamKey)
if ok {
swid = swid2.(*streamwidget.Widget)
} else {
swid = makeStreamWidget(previousFilterValue, filter, Loader.String(), proto)
streamWidgets.Add(*currentStreamKey, swid)
}
if swid.Finished() {
openStreamUi(swid, app)
} else {
// Use the source context. At app shutdown, canceling main will cancel src which will cancel the stream
// loader. And changing source should also cancel the stream loader on all occasions.
StreamLoader = streams.NewLoader(streams.MakeCommands(), Loader.SourceContext())
sh := &streamParseHandler{
app: app,
name: Loader.String(),
proto: proto,
idx: streamIndex.Val(),
wid: swid,
}
StreamLoader.StartLoad(
Loader.PcapPdml,
filterProto,
streamIndex.Val(),
app,
sh,
)
}
}
//======================================================================
type streamParseHandler struct {
app gowid.IApp
tick *time.Ticker // for updating the spinner
stop chan struct{}
stopped bool
chunks chan streams.IChunk
pktIndices chan int
name string
proto streams.Protocol
idx int
wid *streamwidget.Widget
pleaseWaitClosed bool
openedStreams bool
sync.Mutex
}
var _ streams.IOnStreamChunk = (*streamParseHandler)(nil)
var _ streams.IOnStreamHeader = (*streamParseHandler)(nil)
// Run from the app goroutine
func (t *streamParseHandler) drainChunks() int {
curLen := len(t.chunks)
for i := 0; i < curLen; i++ {
chunk := <-t.chunks
if !t.pleaseWaitClosed {
t.pleaseWaitClosed = true
ClosePleaseWait(t.app)
}
t.wid.AddChunkEntire(chunk, t.app)
}
return curLen
}
// Run from the app goroutine
func (t *streamParseHandler) drainPacketIndices() int {
curLen := len(t.pktIndices)
for i := 0; i < curLen; i++ {
packet := <-t.pktIndices
t.wid.TrackPayloadPacket(packet)
}
return curLen
}
func (t *streamParseHandler) BeforeBegin(closeMe chan<- struct{}) {
close(closeMe)
t.app.Run(gowid.RunFunction(func(app gowid.IApp) {
OpenPleaseWait(appView, t.app)
}))
t.tick = time.NewTicker(time.Duration(200) * time.Millisecond)
t.stop = make(chan struct{})
t.chunks = make(chan streams.IChunk, 1000)
t.pktIndices = make(chan int, 1000)
// Start this after widgets have been cleared, to get focus change
termshark.TrackedGo(func() {
fn := func() {
t.app.Run(gowid.RunFunction(func(app gowid.IApp) {
t.drainChunks()
t.drainPacketIndices()
if !t.openedStreams {
appViewNoKeys.SetSubWidget(streamView, app)
openStreamUi(t.wid, app)
t.openedStreams = true
}
}))
}
termshark.RunOnDoubleTicker(t.stop, fn,
time.Duration(200)*time.Millisecond,
time.Duration(200)*time.Millisecond,
10)
}, Goroutinewg)
termshark.TrackedGo(func() {
Loop:
for {
select {
case <-t.tick.C:
t.app.Run(gowid.RunFunction(func(app gowid.IApp) {
pleaseWaitSpinner.Update()
}))
case <-t.stop:
break Loop
}
}
}, Goroutinewg)
}
func (t *streamParseHandler) AfterIndexEnd(success bool, closeMe chan<- struct{}) {
close(closeMe)
t.wid.SetFinished(true)
}
func (t *streamParseHandler) AfterEnd(closeMe chan<- struct{}) {
close(closeMe)
t.app.Run(gowid.RunFunction(func(app gowid.IApp) {
t.Lock()
t.stopped = true
t.Unlock()
if !t.pleaseWaitClosed {
t.pleaseWaitClosed = true
ClosePleaseWait(t.app)
}
if !t.openedStreams {
openStreamUi(t.wid, app)
t.openedStreams = true
}
// Clear out anything lingering from last ticker run to now
for {
if t.drainChunks() == 0 && t.drainPacketIndices() == 0 {
break
}
}
if t.wid.NumChunks() == 0 {
OpenMessage("No stream payloads found.", appView, app)
}
}))
close(t.stop)
}
func (t *streamParseHandler) TrackPayloadPacket(packet int) {
t.Lock()
defer t.Unlock()
if !t.stopped {
t.pktIndices <- packet
}
}
func (t *streamParseHandler) OnStreamHeader(hdr streams.FollowHeader, ch chan struct{}) {
t.app.Run(gowid.RunFunction(func(app gowid.IApp) {
t.wid.AddHeader(hdr)
}))
close(ch)
}
// Handle a line/chunk of input - one piece of reassembled data, which comes with
// a client/server direction.
func (t *streamParseHandler) OnStreamChunk(chunk streams.IChunk, ch chan struct{}) {
t.Lock()
defer t.Unlock()
if !t.stopped {
t.chunks <- chunk
}
close(ch)
}
func (t *streamParseHandler) OnError(err error, closeMe chan<- struct{}) {
close(closeMe)
log.Error(err)
if !Running {
fmt.Fprintf(os.Stderr, "%v\n", err)
QuitRequestedChan <- struct{}{}
} else {
var errstr string
if kverr, ok := err.(gowid.KeyValueError); ok {
errstr = fmt.Sprintf("%v\n\n", kverr.Cause())
kvs := make([]string, 0, len(kverr.KeyVals))
for k, v := range kverr.KeyVals {
kvs = append(kvs, fmt.Sprintf("%v: %v", k, v))
}
errstr = errstr + strings.Join(kvs, "\n")
} else {
errstr = fmt.Sprintf("%v", err)
}
t.app.Run(gowid.RunFunction(func(app gowid.IApp) {
OpenError(errstr, app)
}))
}
}
func initStreamWidgetCache() {
widgetCacheSize := termshark.ConfInt("main.stream-cache-size", 100)
var err error
streamWidgets, err = lru.New(widgetCacheSize)
if err != nil {
log.Fatal(err)
}
log.Infof("Initialized stream widget cache with %d entries.", widgetCacheSize)
}
func clearStreamState() {
initStreamWidgetCache()
currentStreamKey = nil
}
type streamClicker struct{}
var _ streamwidget.IChunkClicked = streamClicker{}
func (c streamClicker) OnPacketClicked(pkt int, app gowid.IApp) error {
if packetListView != nil {
coords, err := packetListView.FocusXY()
if err == nil {
// Need to go from row identifier ("9th packet") to display order which might be sorted.
// Note that for our pcap table, the row identifier (logical id) for each table row is
// itself an int i.e. packet #0, packet #1 (although the packet's *frame number* might
// be different if there's a filter). When OnChunkClicked() is called, it means react
// to a click on the logical packet #N (where the stream loader tracks pcap packet ->
// packet-with-payload). So
//
// - user clicks on 9th item in stream view
// - the stream loader translates this to the 15th packet in the pcap (rest are SYN, etc)
// - the inverted table model translates this to display row #5 in the table (because it's sorted)
// - then we set the display row and switch to the data/away from the table header
//
if row, ok := packetListView.InvertedModel().IdentifierToRow(table.RowId(pkt)); !ok {
OpenError(fmt.Sprintf("Unexpected error looking up packet %v.", pkt), app)
} else {
coords.Row = row // cast to int - we want row == #item in list
packetListView.SetFocusXY(app, coords)
packetListTable.SetFocusOnData(app)
packetListTable.GoToMiddle(app)
setFocusOnPacketList(app)
OpenMessage(fmt.Sprintf("Selected packet %d.", pkt+1), appView, app)
}
}
}
return nil
}
func (c streamClicker) HandleError(row table.RowId, err error, app gowid.IApp) {
OpenError(fmt.Sprintf("Packet at row %v is not loaded yet. Try again in a few seconds.", row), app)
}
//======================================================================
type simpleOnError struct{}
func (s simpleOnError) OnError(msg string, app gowid.IApp) {
OpenError(msg, app)
}
func makeStreamWidget(previousFilter string, filter string, cap string, proto streams.Protocol) *streamwidget.Widget {
return streamwidget.New(filter, cap, proto,
conversationMenu, conversationMenuHolder,
streamwidget.Options{
DefaultDisplay: func() streamwidget.DisplayFormat {
view := streamwidget.Hex
choice := termshark.ConfString("main.stream-view", "hex")
switch choice {
case "raw":
view = streamwidget.Raw
case "ascii":
view = streamwidget.Ascii
}
return view
},
PreviousFilter: previousFilter,
FilterOutFunc: func(w streamwidget.IFilterOut, app gowid.IApp) {
closeStreamUi(app, true)
var newFilter string
if w.PreviousFilter() == "" {
newFilter = fmt.Sprintf("!(%s)", w.DisplayFilter())
} else {
newFilter = fmt.Sprintf("%s and !(%s)", w.PreviousFilter(), w.DisplayFilter())
}
FilterWidget.SetValue(newFilter, app)
PcapScheduler.RequestNewFilter(newFilter, MakePacketViewUpdater(app))
},
CopyModeWidget: CopyModeWidget,
ChunkClicker: streamClicker{},
ErrorHandler: simpleOnError{},
})
}
//======================================================================
func openStreamUi(swid *streamwidget.Widget, app gowid.IApp) {
streamViewNoKeysHolder.SetSubWidget(swid, app)
appViewNoKeys.SetSubWidget(streamView, app)
// When opening, put focus on the list of stream chunks. There may be none in which case
// this won't work. But when UI is constructed, there are no chunks, even though it's not
// open yet, so focus on the pile goes to the bottom, even when the chunk table becomes populated.
// That's not ideal.
swid.SetFocusOnChunksIfPossible(app)
}
func closeStreamUi(app gowid.IApp, refocus bool) {
appViewNoKeys.SetSubWidget(mainView, app)
// Do this if the user starts reassembly from the menu - better UX
if refocus {
setFocusOnPacketList(app)
}
}
//======================================================================
func buildStreamUi() {
conversationMenuHolder, conversationMenu = streamwidget.MakeConvMenu()
streamViewNoKeysHolder = holder.New(null.New())
streamView = appkeys.New(
appkeys.New(
appkeys.New(
streamViewNoKeysHolder,
streamKeyPress,
),
copyModeExitKeys20,
appkeys.Options{
ApplyBefore: true,
},
),
copyModeEnterKeys,
)
}
//======================================================================
// Local Variables:
// mode: Go
// fill-column: 110
// End: