external/bsd/tcpdump/dist/print-beep.c

   1 /*
   2  * Copyright (C) 2000, Richard Sharpe
   3  *
   4  * This software may be distributed either under the terms of the
   5  * BSD-style licence that accompanies tcpdump or under the GNU GPL
   6  * version 2 or later.
   7  *
   8  * print-beep.c
   9  *
  10  */
  11
  12 #include <sys/cdefs.h>
  13 #ifndef lint
  14 __RCSID("$NetBSD: print-beep.c,v 1.4 2014/11/20 03:05:03 christos Exp $");
  15 #endif
  16
  17 #define NETDISSECT_REWORKED
  18 #ifdef HAVE_CONFIG_H
  19 #include "config.h"
  20 #endif
  21
  22 #include <tcpdump-stdinc.h>
  23
  24 #include <string.h>
  25
  26 #include "interface.h"
  27
  28 /* Check for a string but not go beyond length
  29  * Return TRUE on match, FALSE otherwise
  30  *
  31  * Looks at the first few chars up to tl1 ...
  32  */
  33
  34 static int
  35 l_strnstart(const char *tstr1, u_int tl1, const char *str2, u_int l2)
  36 {
  37
  38         if (tl1 > l2)
  39                 return 0;
  40
  41         return (strncmp(tstr1, str2, tl1) == 0 ? 1 : 0);
  42 }
  43
  44 void
  45 beep_print(netdissect_options *ndo, const u_char *bp, u_int length)
  46 {
  47
  48         if (l_strnstart("MSG", 4, (const char *)bp, length)) /* A REQuest */
  49                 ND_PRINT((ndo, " BEEP MSG"));
  50         else if (l_strnstart("RPY ", 4, (const char *)bp, length))
  51                 ND_PRINT((ndo, " BEEP RPY"));
  52         else if (l_strnstart("ERR ", 4, (const char *)bp, length))
  53                 ND_PRINT((ndo, " BEEP ERR"));
  54         else if (l_strnstart("ANS ", 4, (const char *)bp, length))
  55                 ND_PRINT((ndo, " BEEP ANS"));
  56         else if (l_strnstart("NUL ", 4, (const char *)bp, length))
  57                 ND_PRINT((ndo, " BEEP NUL"));
  58         else if (l_strnstart("SEQ ", 4, (const char *)bp, length))
  59                 ND_PRINT((ndo, " BEEP SEQ"));
  60         else if (l_strnstart("END", 4, (const char *)bp, length))
  61                 ND_PRINT((ndo, " BEEP END"));
  62         else
  63                 ND_PRINT((ndo, " BEEP (payload or undecoded)"));
  64 }