X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/39d15607cad1b4b463794c1a67873f6182dc52f7..1a04b92e365f5ed01ca38619b41bcc4fc9cbd63c:/print-beep.c

diff --git a/print-beep.c b/print-beep.c
index 1ddb9eb5..2be7a7b6 100644
--- a/print-beep.c
+++ b/print-beep.c
@@ -2,18 +2,20 @@
  * Copyright (C) 2000, Richard Sharpe
  *
  * This software may be distributed either under the terms of the
- * BSD-style licence that accompanies tcpdump or under the GNU GPL
+ * BSD-style license that accompanies tcpdump or under the GNU GPL
  * version 2 or later.
  *
  * print-beep.c
  *
  */
 
+/* \summary: Blocks Extensible Exchange Protocol (BEEP) printer */
+
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
-#include <tcpdump-stdinc.h>
+#include <netdissect-stdinc.h>
 
 #include <string.h>
 
@@ -26,9 +28,17 @@
  */
 
 static int
-l_strnstart(const char *tstr1, u_int tl1, const char *str2, u_int l2)
+l_strnstart(netdissect_options *ndo, const char *tstr1, u_int tl1,
+    const char *str2, u_int l2)
 {
-
+	if (!ND_TTEST_LEN(str2, tl1)) {
+		/*
+		 * We don't have tl1 bytes worth of captured data
+		 * for the string, so we can't check for this
+		 * string.
+		 */
+		return 0;
+	}
 	if (tl1 > l2)
 		return 0;
 
@@ -39,19 +49,19 @@ void
 beep_print(netdissect_options *ndo, const u_char *bp, u_int length)
 {
 
-	if (l_strnstart("MSG", 4, (const char *)bp, length)) /* A REQuest */
+	if (l_strnstart(ndo, "MSG", 4, (const char *)bp, length)) /* A REQuest */
 		ND_PRINT((ndo, " BEEP MSG"));
-	else if (l_strnstart("RPY ", 4, (const char *)bp, length))
+	else if (l_strnstart(ndo, "RPY ", 4, (const char *)bp, length))
 		ND_PRINT((ndo, " BEEP RPY"));
-	else if (l_strnstart("ERR ", 4, (const char *)bp, length))
+	else if (l_strnstart(ndo, "ERR ", 4, (const char *)bp, length))
 		ND_PRINT((ndo, " BEEP ERR"));
-	else if (l_strnstart("ANS ", 4, (const char *)bp, length))
+	else if (l_strnstart(ndo, "ANS ", 4, (const char *)bp, length))
 		ND_PRINT((ndo, " BEEP ANS"));
-	else if (l_strnstart("NUL ", 4, (const char *)bp, length))
+	else if (l_strnstart(ndo, "NUL ", 4, (const char *)bp, length))
 		ND_PRINT((ndo, " BEEP NUL"));
-	else if (l_strnstart("SEQ ", 4, (const char *)bp, length))
+	else if (l_strnstart(ndo, "SEQ ", 4, (const char *)bp, length))
 		ND_PRINT((ndo, " BEEP SEQ"));
-	else if (l_strnstart("END", 4, (const char *)bp, length))
+	else if (l_strnstart(ndo, "END", 4, (const char *)bp, length))
 		ND_PRINT((ndo, " BEEP END"));
 	else
 		ND_PRINT((ndo, " BEEP (payload or undecoded)"));