fix: Extract network metadata from tcpdump headers to populate SIP packet IPs

internal/capture/local.go

@@ -15,10 +15,11 @@ import (
 
 // LocalCapturer handles SIP packet capture locally via tcpdump
 type LocalCapturer struct {
-	cmd     *exec.Cmd
-	cancel  context.CancelFunc
-	running bool
-	mu      sync.Mutex
+	cmd            *exec.Cmd
+	cancel         context.CancelFunc
+	running        bool
+	mu             sync.Mutex
+	currentNetInfo *NetInfo
 
 	// Callbacks
 	OnPacket func(*sip.Packet)
@@ -138,6 +139,13 @@ func (c *LocalCapturer) processStream(r io.Reader) {
 		line := scanner.Text()
 		// logger.Debug("Stdout: %s", line) // Commented out to reduce noise, enable if needed
 
+		// Check for tcpdump header
+		if netInfo := parseTcpdumpHeader(line); netInfo != nil {
+			c.currentNetInfo = netInfo
+			// Proceed to next line
+			continue
+		}
+
 		// Detect start of SIP message
 		if idx := findSIPStart(line); idx != -1 {
 			logger.Debug("SIP Start detected: %s", line)
@@ -190,6 +198,14 @@ func (c *LocalCapturer) parseAndEmit(raw string) {
 		return
 	}
 	if packet != nil {
+		// Attach network info if available
+		if c.currentNetInfo != nil {
+			packet.Timestamp = c.currentNetInfo.Timestamp
+			packet.SourceIP = c.currentNetInfo.SourceIP
+			packet.SourcePort = c.currentNetInfo.SourcePort
+			packet.DestIP = c.currentNetInfo.DestIP
+			packet.DestPort = c.currentNetInfo.DestPort
+		}
 		logger.Debug("Packet parsed: %s %s -> %s", packet.Method, packet.SourceIP, packet.DestIP)
 		if c.OnPacket != nil {
 			c.OnPacket(packet)