Patch by Robert Scheck <robert@fedoraproject.org> for dsniff >= 2.4b1, that
adds further link layer offsets; inspirated from the original DLT_LINUX_SLL
patch by Roland Kletzing <devzero@web.de>. This patch supersedes the Debian
patch by Joerg Dorchain <joerg@dorchain.net> which adds tcpkill support for
handling PPP interfaces. So for some further information, please also have
a look to Debian bug ID #572516.

--- dsniff-2.4/pcaputil.c		2001-03-15 09:33:04.000000000 +0100
+++ dsniff-2.4/pcaputil.c.ll_offset	2011-10-09 17:13:01.000000000 +0200
@@ -46,12 +46,63 @@
 	case DLT_FDDI:
 		offset = 21;
 		break;
+#ifdef __amigaos__
+	case DLT_MIAMI:
+		offset = 16;
+		break;
+#endif
+	case DLT_RAW:
 #ifdef DLT_LOOP
 	case DLT_LOOP:
 #endif
 	case DLT_NULL:
 		offset = 4;
 		break;
+	case DLT_SLIP:
+#ifdef DLT_SLIP_BSDOS
+	case DLT_SLIP_BSDOS:
+#endif
+#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__bsdi__) || defined(__APPLE__)
+		offset = 16;
+#else
+		offset = 24;
+#endif
+		break;
+	case DLT_PPP:
+#ifdef DLT_PPP_BSDOS
+	case DLT_PPP_BSDOS:
+#endif
+#ifdef DLT_PPP_SERIAL
+	case DLT_PPP_SERIAL:
+#endif
+#ifdef DLT_PPP_ETHER
+	case DLT_PPP_ETHER:
+#endif
+#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__bsdi__) || defined(__APPLE__)
+		offset = 4;
+#else
+#if defined(sun) || defined(__sun)
+		offset = 8;
+#else
+		offset = 24;
+#endif
+#endif
+		break;
+#ifdef DLT_ENC
+	case DLT_ENC:
+		offset = 12;
+		break;
+#endif
+#ifdef DLT_LINUX_SLL
+	case DLT_LINUX_SLL:
+		offset = 16;
+		break;
+#endif
+#ifdef DLT_IPNET
+	case DLT_IPNET:
+		offset = 24;
+		break;
+#endif
 	default:
 		warnx("unsupported datalink type");
 		break;