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