X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/99c91c3aec40b691641374f58e798bd8d6b657bd..47b02443f099fc93a7c69041d30bf6f6be552ece:/print-cip.c?ds=sidebyside

diff --git a/print-cip.c b/print-cip.c
index 2ea50bc0..a123b69f 100644
--- a/print-cip.c
+++ b/print-cip.c
@@ -20,6 +20,8 @@
  *
  */
 
+/* \summary: Classical-IP over ATM printer */
+
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
@@ -31,8 +33,6 @@
 #include "netdissect.h"
 #include "addrtoname.h"
 
-#define RFC1483LLC_LEN	8
-
 static const unsigned char rfcllc[] = {
 	0xaa,	/* DSAP: non-ISO */
 	0xaa,	/* SSAP: non-ISO */
@@ -42,12 +42,12 @@ static const unsigned char rfcllc[] = {
 	0x00 };
 
 static inline void
-cip_print(netdissect_options *ndo, int length)
+cip_print(netdissect_options *ndo, u_int length)
 {
 	/*
 	 * There is no MAC-layer header, so just print the length.
 	 */
-	ND_PRINT((ndo, "%d: ", length));
+	ND_PRINT((ndo, "%u: ", length));
 }
 
 /*
@@ -61,17 +61,23 @@ cip_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char
 {
 	u_int caplen = h->caplen;
 	u_int length = h->len;
+	size_t cmplen;
 	int llc_hdrlen;
 
-	if (memcmp(rfcllc, p, sizeof(rfcllc))==0 && caplen < RFC1483LLC_LEN) {
-		ND_PRINT((ndo, "[|cip]"));
-		return (0);
-	}
+	cmplen = sizeof(rfcllc);
+	if (cmplen > caplen)
+		cmplen = caplen;
+	if (cmplen > length)
+		cmplen = length;
 
 	if (ndo->ndo_eflag)
 		cip_print(ndo, length);
 
-	if (memcmp(rfcllc, p, sizeof(rfcllc)) == 0) {
+	if (cmplen == 0) {
+		ND_PRINT((ndo, "[|cip]"));
+		return 0;
+	}
+	if (memcmp(rfcllc, p, cmplen) == 0) {
 		/*
 		 * LLC header is present.  Try to print it & higher layers.
 		 */