X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/2a579c6b18e16138a1296e6942c84cde163d0717..296d466cd6bbf2f7e75e15bb6a01268e88c76ed0:/print-cip.c

diff --git a/print-cip.c b/print-cip.c
index a6467136..96587fe0 100644
--- a/print-cip.c
+++ b/print-cip.c
@@ -1,6 +1,6 @@
 /*
- * Marko Kiiskila carnil@cs.tut.fi 
- * 
+ * Marko Kiiskila carnil@cs.tut.fi
+ *
  * Tampere University of Technology - Telecommunications Laboratory
  *
  * Permission to use, copy, modify and distribute this
@@ -12,47 +12,27 @@
  * 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.
- * 
+ *
  */
 
-#ifndef lint
-static const char rcsid[] =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-cip.c,v 1.12 2001-03-19 03:58:10 guy Exp $ (LBL)";
-#endif
+/* \summary: Linux Classical IP over ATM printer */
 
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
+#include <config.h>
 
 #include <string.h>
 
-#include <sys/param.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-
-
-#include <netinet/in.h>
-
-#include <stdio.h>
-#include <pcap.h>
+#include "netdissect-stdinc.h"
 
-#include "interface.h"
+#define ND_LONGJMP_FROM_TCHECK
+#include "netdissect.h"
 #include "addrtoname.h"
-#include "ethertype.h"
-#include "ether.h"
 
-const u_char *packetp;
-const u_char *snapend;
-
-#define RFC1483LLC_LEN	8 
-
-static unsigned char rfcllc[] = {
+static const unsigned char rfcllc[] = {
 	0xaa,	/* DSAP: non-ISO */
 	0xaa,	/* SSAP: non-ISO */
 	0x03,	/* Ctrl: Unnumbered Information Command PDU */
@@ -60,102 +40,46 @@ static unsigned char rfcllc[] = {
 	0x00,
 	0x00 };
 
-static inline void
-cip_print(register const u_char *bp, int length)
-{
-	int i;
-
-	if (memcmp(rfcllc, bp, sizeof(rfcllc))) {
-		if (qflag) {
-			for (i = 0;i < RFC1483LLC_LEN; i++)
-			(void)printf("%2.2x ",bp[i]);
-		} else {
-			for (i = 0;i < RFC1483LLC_LEN - 2; i++)
-				(void)printf("%2.2x ",bp[i]);
-			etherproto_string(((u_short*)bp)[3]);
-		} 
-	} else {
-		if (qflag)
-			(void)printf("(null encapsulation)");
-		else {
-			(void)printf("(null encap)");
-			etherproto_string(ETHERTYPE_IP);
-		}
-	}
-}
-
 /*
- * This is the top level routine of the printer.  'p' is the points
- * to the raw header of the packet, 'tvp' is the timestamp,
- * 'length' is the length of the packet off the wire, and 'caplen'
+ * 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.
  */
 void
-cip_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
+cip_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
 {
-	int caplen = h->caplen;
-	int length = h->len;
-	u_short ether_type;
-	u_short extracted_ethertype;
-	u_short *bp;
-
-	ts_print(&h->ts);
-
-	if (memcmp(rfcllc, p, sizeof(rfcllc))==0 && caplen < RFC1483LLC_LEN) {
-		printf("[|cip]");
-		goto out;
-	}
-
-	if (eflag)
-		cip_print(p, length);
-
-	/*
-	 * Some printers want to get back at the ethernet addresses,
-	 * and/or check that they're not walking off the end of the packet.
-	 * Rather than pass them all the way down, we set these globals.
-	 */
-	packetp = p;
-	snapend = p + caplen;
-
-	if (memcmp(rfcllc, p, sizeof(rfcllc))==0) {
-		length -= RFC1483LLC_LEN;
-		caplen -= RFC1483LLC_LEN;
-		bp = (u_short *)p;
-		p += RFC1483LLC_LEN;
-		ether_type = ntohs(bp[3]);
+	u_int caplen = h->caplen;
+	u_int length = h->len;
+	int llc_hdrlen;
+
+	ndo->ndo_protocol = "cip";
+
+	if (ndo->ndo_eflag)
+		/*
+		 * There is no MAC-layer header, so just print the length.
+		 */
+		ND_PRINT("%u: ", length);
+
+	ND_TCHECK_LEN(p, sizeof(rfcllc));
+	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 {
-		ether_type = ETHERTYPE_IP;
-		bp = (u_short *)p;
+		/*
+		 * LLC header is absent; treat it as just IP.
+		 */
+		llc_hdrlen = 0;
+		ip_print(ndo, p, length);
 	}
 
-	/*
-	 * Is it (gag) an 802.3 encapsulation?
-	 */
-	extracted_ethertype = 0;
-	if (ether_type < ETHERMTU) {
-		/* Try to print the LLC-layer header & higher layers */
-		if (llc_print(p, length, caplen, NULL, NULL,
-		    &extracted_ethertype)==0) {
-			/* ether_type not known, print raw packet */
-			if (!eflag)
-				cip_print((u_char *)bp, length + RFC1483LLC_LEN);
-			if (extracted_ethertype) {
-				printf("(LLC %s) ",
-			       etherproto_string(htons(extracted_ethertype)));
-			}
-			if (!xflag && !qflag)
-				default_print(p, caplen);
-		}
-	} else if (ether_encap_print(ether_type, p, length, caplen,
-	    &extracted_ethertype) == 0) {
-		/* ether_type not known, print raw packet */
-		if (!eflag)
-			cip_print((u_char *)bp, length + RFC1483LLC_LEN);
-		if (!xflag && !qflag)
-			default_print(p, caplen);
-	}
-	if (xflag)
-		default_print(p, caplen);
- out:
-	putchar('\n');
+	ndo->ndo_ll_hdr_len += llc_hdrlen;
 }