The Tcpdump Group git mirrors - tcpdump/blob - 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 license that accompanies tcpdump or under the GNU GPL
   6  * version 2 or later.
   7  *
   8  * print-beep.c
   9  *
  10  */
  11
  12 #ifdef HAVE_CONFIG_H
  13 #include "config.h"
  14 #endif
  15
  16 #include <netdissect-stdinc.h>
  17
  18 #include <string.h>
  19
  20 #include "netdissect.h"
  21
  22 /* Check for a string but not go beyond length
  23  * Return TRUE on match, FALSE otherwise
  24  *
  25  * Looks at the first few chars up to tl1 ...
  26  */
  27
  28 static int
  29 l_strnstart(const char *tstr1, u_int tl1, const char *str2, u_int l2)
  30 {
  31
  32         if (tl1 > l2)
  33                 return 0;
  34
  35         return (strncmp(tstr1, str2, tl1) == 0 ? 1 : 0);
  36 }
  37
  38 void
  39 beep_print(netdissect_options *ndo, const u_char *bp, u_int length)
  40 {
  41
  42         if (l_strnstart("MSG", 4, (const char *)bp, length)) /* A REQuest */
  43                 ND_PRINT((ndo, " BEEP MSG"));
  44         else if (l_strnstart("RPY ", 4, (const char *)bp, length))
  45                 ND_PRINT((ndo, " BEEP RPY"));
  46         else if (l_strnstart("ERR ", 4, (const char *)bp, length))
  47                 ND_PRINT((ndo, " BEEP ERR"));
  48         else if (l_strnstart("ANS ", 4, (const char *)bp, length))
  49                 ND_PRINT((ndo, " BEEP ANS"));
  50         else if (l_strnstart("NUL ", 4, (const char *)bp, length))
  51                 ND_PRINT((ndo, " BEEP NUL"));
  52         else if (l_strnstart("SEQ ", 4, (const char *)bp, length))
  53                 ND_PRINT((ndo, " BEEP SEQ"));
  54         else if (l_strnstart("END", 4, (const char *)bp, length))
  55                 ND_PRINT((ndo, " BEEP END"));
  56         else
  57                 ND_PRINT((ndo, " BEEP (payload or undecoded)"));
  58 }