chore: Add verbose logging to local capture for debugging purposes

internal/capture/local.go

@@ -9,6 +9,7 @@ import (
 	"strings"
 	"sync"
 
+	"telephony-inspector/internal/logger"
 	"telephony-inspector/internal/sip"
 )
 
@@ -50,6 +51,8 @@ func (c *LocalCapturer) Start(iface string, port int) error {
 	args := []string{"-l", "-nn", "-A", "-s", "0", "-i", iface, "port", fmt.Sprintf("%d", port)}
 	c.cmd = exec.CommandContext(ctx, "tcpdump", args...)
 
+	logger.Info("Starting local capture: tcpdump %v", args)
+
 	stdout, err := c.cmd.StdoutPipe()
 	if err != nil {
 		c.mu.Lock()
@@ -73,6 +76,8 @@ func (c *LocalCapturer) Start(iface string, port int) error {
 		return fmt.Errorf("failed to start tcpdump: %w", err)
 	}
 
+	logger.Info("Local capture started successfully")
+
 	// Process stdout in goroutine
 	go c.processStream(stdout)
 
@@ -90,6 +95,7 @@ func (c *LocalCapturer) Stop() {
 	if !c.running {
 		return
 	}
+	logger.Info("Stopping local capture")
 	c.running = false
 
 	if c.cancel != nil {
@@ -130,9 +136,11 @@ func (c *LocalCapturer) processStream(r io.Reader) {
 		}
 
 		line := scanner.Text()
+		// logger.Debug("Stdout: %s", line) // Commented out to reduce noise, enable if needed
 
 		// Detect start of SIP message
 		if isSIPStart(line) {
+			logger.Debug("SIP Start detected: %s", line)
 			// If we were building a message, parse it
 			if buffer.Len() > 0 {
 				c.parseAndEmit(buffer.String())
@@ -159,8 +167,10 @@ func (c *LocalCapturer) processErrors(r io.Reader) {
 		text := scanner.Text()
 		// tcpdump prints "listening on..." to stderr, ignore it
 		if strings.Contains(text, "listening on") {
+			logger.Info("tcpdump: %s", text)
 			continue
 		}
+		logger.Error("tcpdump stderr: %s", text)
 		if c.OnError != nil {
 			c.OnError(fmt.Errorf("tcpdump: %s", text))
 		}
@@ -170,12 +180,16 @@ func (c *LocalCapturer) processErrors(r io.Reader) {
 func (c *LocalCapturer) parseAndEmit(raw string) {
 	packet, err := sip.Parse(raw)
 	if err != nil {
+		logger.Error("Error parsing SIP packet: %v", err)
 		if c.OnError != nil {
 			c.OnError(err)
 		}
 		return
 	}
-	if packet != nil && c.OnPacket != nil {
-		c.OnPacket(packet)
+	if packet != nil {
+		logger.Debug("Packet parsed: %s %s -> %s", packet.Method, packet.SourceIP, packet.DestIP)
+		if c.OnPacket != nil {
+			c.OnPacket(packet)
+		}
 	}
 }