create project

print-cip.c

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+/*
+ * Marko Kiiskila carnil@cs.tut.fi
+ *
+ * Tampere University of Technology - Telecommunications Laboratory
+ *
+ * Permission to use, copy, modify and distribute this
+ * software and its documentation is hereby granted,
+ * provided that both the copyright notice and this
+ * permission notice appear in all copies of the software,
+ * derivative works or modified versions, and any portions
+ * thereof, that both notices appear in supporting
+ * documentation, and that the use of this software is
+ * acknowledged in any publications resulting from using
+ * the software.
+ *
+ * TUT ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION AND DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS
+ * SOFTWARE.
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <string.h>
+
+#include <netdissect-stdinc.h>
+
+#include "netdissect.h"
+#include "addrtoname.h"
+
+#define RFC1483LLC_LEN	8
+
+static const unsigned char rfcllc[] = {
+	0xaa,	/* DSAP: non-ISO */
+	0xaa,	/* SSAP: non-ISO */
+	0x03,	/* Ctrl: Unnumbered Information Command PDU */
+	0x00,	/* OUI: EtherType */
+	0x00,
+	0x00 };
+
+static inline void
+cip_print(netdissect_options *ndo, int length)
+{
+	/*
+	 * There is no MAC-layer header, so just print the length.
+	 */
+	ND_PRINT((ndo, "%d: ", length));
+}
+
+/*
+ * This is the top level routine of the printer.  'p' points
+ * to the LLC/SNAP or raw header of the packet, 'h->ts' is the timestamp,
+ * 'h->len' is the length of the packet off the wire, and 'h->caplen'
+ * is the number of bytes actually captured.
+ */
+u_int
+cip_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
+{
+	u_int caplen = h->caplen;
+	u_int length = h->len;
+	int llc_hdrlen;
+
+	if (memcmp(rfcllc, p, sizeof(rfcllc))==0 && caplen < RFC1483LLC_LEN) {
+		ND_PRINT((ndo, "[|cip]"));
+		return (0);
+	}
+
+	if (ndo->ndo_eflag)
+		cip_print(ndo, length);
+
+	if (memcmp(rfcllc, p, sizeof(rfcllc)) == 0) {
+		/*
+		 * LLC header is present.  Try to print it & higher layers.
+		 */
+		llc_hdrlen = llc_print(ndo, p, length, caplen, NULL, NULL);
+		if (llc_hdrlen < 0) {
+			/* packet type not known, print raw packet */
+			if (!ndo->ndo_suppress_default_print)
+				ND_DEFAULTPRINT(p, caplen);
+			llc_hdrlen = -llc_hdrlen;
+		}
+	} else {
+		/*
+		 * LLC header is absent; treat it as just IP.
+		 */
+		llc_hdrlen = 0;
+		ip_print(ndo, p, length);
+	}
+
+	return (llc_hdrlen);
+}
+
+
+/*
+ * Local Variables:
+ * c-style: whitesmith
+ * c-basic-offset: 8
+ * End:
+ */