new: implemented can.dup and can.dump.inject to read a candump log file

.gitignore

@@ -15,3 +15,4 @@ stage/
 /snap
 .idea
 /cover.out
+/can-data

modules/can/can.go

@@ -2,6 +2,7 @@ package can
 
 import (
 	"errors"
+	"fmt"
 	"net"
 
 	"github.com/bettercap/bettercap/v2/session"
@@ -13,6 +14,8 @@ type CANModule struct {
 	session.SessionModule
 
 	deviceName string
+	dumpName   string
+	dumpInject bool
 	transport  string
 	filter     string
 	filterExpr *bexpr.Evaluator
@@ -30,6 +33,8 @@ func NewCanModule(s *session.Session) *CANModule {
 		filterExpr:    nil,
 		transport:     "can",
 		deviceName:    "can0",
+		dumpName:      "",
+		dumpInject:    false,
 	}
 
 	mod.AddParam(session.NewStringParameter("can.device",
@@ -37,6 +42,15 @@ func NewCanModule(s *session.Session) *CANModule {
 		"",
 		"CAN-bus device."))
 
+	mod.AddParam(session.NewStringParameter("can.dump",
+		mod.dumpName,
+		"",
+		"Load CAN traffic from this candump log file."))
+
+	mod.AddParam(session.NewBoolParameter("can.dump.inject",
+		fmt.Sprintf("%v", mod.dumpInject),
+		"Write CAN traffic read form the candump log file to the selected can.device."))
+
 	mod.AddParam(session.NewStringParameter("can.transport",
 		mod.transport,
 		"",
@@ -53,18 +67,6 @@ func NewCanModule(s *session.Session) *CANModule {
 			return mod.Start()
 		}))
 
-	mod.AddHandler(session.NewModuleHandler("can.load_dbc PATH", "",
-		"Start CAN-bus discovery.",
-		func(args []string) error {
-			return mod.Start()
-		}))
-
-	mod.AddHandler(session.NewModuleHandler("can.dbc.load NAME", "can.dbc.load (.+)",
-		"Load a DBC file from the list of available ones or from disk.",
-		func(args []string) error {
-			return mod.dbcLoad(args[0])
-		}))
-
 	mod.AddHandler(session.NewModuleHandler("can.recon off", "",
 		"Stop CAN-bus discovery.",
 		func(args []string) error {
@@ -84,6 +86,12 @@ func NewCanModule(s *session.Session) *CANModule {
 			return mod.Show()
 		}))
 
+	mod.AddHandler(session.NewModuleHandler("can.dbc.load NAME", "can.dbc.load (.+)",
+		"Load a DBC file from the list of available ones or from disk.",
+		func(args []string) error {
+			return mod.dbcLoad(args[0])
+		}))
+
 	mod.AddHandler(session.NewModuleHandler("can.inject FRAME_EXPRESSION", `(?i)^can\.inject\s+([a-fA-F0-9#R]+)$`,
 		"Parse FRAME_EXPRESSION as 'id#data' and inject it as a CAN frame.",
 		func(args []string) error {

modules/can/can_dump_reader.go

@@ -0,0 +1,76 @@
+package can
+
+import (
+	"bufio"
+	"context"
+	"os"
+	"regexp"
+
+	"github.com/evilsocket/islazy/str"
+	"go.einride.tech/can"
+)
+
+// (1700623093.260875) can0 7E0#0322128C00000000
+var dumpLineParser = regexp.MustCompile(`(?m)^\(([\d\.]+)\)\s+([^\s]+)\s+(.+)`)
+
+type dumpEntry struct {
+	Time   string
+	Device string
+	Frame  string
+}
+
+func (mod *CANModule) startDumpReader() error {
+	mod.Info("loading CAN dump from %s ...", mod.dumpName)
+
+	file, err := os.Open(mod.dumpName)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	entries := make([]dumpEntry, 0)
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		line := str.Trim(scanner.Text())
+		if line != "" {
+			if m := dumpLineParser.FindStringSubmatch(line); len(m) != 4 {
+				mod.Warning("unexpected line: '%s' -> %d matches", line, len(m))
+			} else {
+				entries = append(entries, dumpEntry{
+					Time:   m[1],
+					Device: m[2],
+					Frame:  m[3],
+				})
+			}
+		}
+	}
+
+	if err = scanner.Err(); err != nil {
+		return err
+	}
+
+	mod.Info("loaded %d entries from candump log", len(entries))
+
+	go func() {
+		mod.Info("candump reader started ...")
+
+		for _, entry := range entries {
+			frame := can.Frame{}
+			if err := frame.UnmarshalString(entry.Frame); err != nil {
+				mod.Error("could not unmarshal CAN frame: %v", err)
+				continue
+			}
+
+			if mod.dumpInject {
+				if err := mod.send.TransmitFrame(context.Background(), frame); err != nil {
+					mod.Error("could not send CAN frame: %v", err)
+				}
+			} else {
+				mod.onFrame(frame)
+			}
+		}
+	}()
+
+	return nil
+}

modules/can/can_recon.go

@@ -25,6 +25,10 @@ func (mod *CANModule) Configure() error {
 		return session.ErrAlreadyStarted(mod.Name())
 	} else if err, mod.deviceName = mod.StringParam("can.device"); err != nil {
 		return err
+	} else if err, mod.dumpName = mod.StringParam("can.dump"); err != nil {
+		return err
+	} else if err, mod.dumpInject = mod.BoolParam("can.dump.inject"); err != nil {
+		return err
 	} else if err, mod.transport = mod.StringParam("can.transport"); err != nil {
 		return err
 	} else if mod.transport != "can" && mod.transport != "udp" {
@@ -43,10 +47,15 @@ func (mod *CANModule) Configure() error {
 	if mod.conn, err = socketcan.Dial(mod.transport, mod.deviceName); err != nil {
 		return err
 	}
-
 	mod.recv = socketcan.NewReceiver(mod.conn)
 	mod.send = socketcan.NewTransmitter(mod.conn)
 
+	if mod.dumpName != "" {
+		if err = mod.startDumpReader(); err != nil {
+			return err
+		}
+	}
+
 	return nil
 }