xref: /freebsd/contrib/tcpdump/print-calm-fast.c (revision 7ab1a32cd43cbae61ad4dd435d6a482bbf61cb52)
1 /*
2  * Copyright (c) 2013 The TCPDUMP project
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that: (1) source code
6  * distributions retain the above copyright notice and this paragraph
7  * in its entirety, and (2) distributions including binary code include
8  * the above copyright notice and this paragraph in its entirety in
9  * the documentation or other materials provided with the distribution.
10  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
11  * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
12  * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
13  * FOR A PARTICULAR PURPOSE.
14  *
15  * Original code by Ola Martin Lykkja (ola.lykkja@q-free.com)
16  */
17 
18 /* \summary: Communication access for land mobiles (CALM) printer */
19 
20 #include <config.h>
21 
22 #include "netdissect-stdinc.h"
23 
24 #define ND_LONGJMP_FROM_TCHECK
25 #include "netdissect.h"
26 #include "extract.h"
27 #include "addrtoname.h"
28 
29 /*
30    ISO 29281:2009
31    Intelligent Transport Systems . Communications access for land mobiles (CALM)
32    CALM non-IP networking
33 */
34 
35 /*
36  * This is the top level routine of the printer.  'bp' points
37  * to the calm header of the packet.
38  */
39 void
40 calm_fast_print(netdissect_options *ndo, const u_char *bp, u_int length, const struct lladdr_info *src)
41 {
42 	ndo->ndo_protocol = "calm_fast";
43 
44 	ND_PRINT("CALM FAST");
45 	if (src != NULL)
46 		ND_PRINT(" src:%s", (src->addr_string)(ndo, src->addr));
47 	ND_PRINT("; ");
48 
49 	if (length < 2) {
50 		ND_PRINT(" (length %u < 2)", length);
51 		goto invalid;
52 	}
53 
54 	ND_PRINT("SrcNwref:%u; ", GET_U_1(bp));
55 	length -= 1;
56 	bp += 1;
57 
58 	ND_PRINT("DstNwref:%u; ", GET_U_1(bp));
59 	length -= 1;
60 	bp += 1;
61 
62 	if (ndo->ndo_vflag)
63 		ND_DEFAULTPRINT(bp, length);
64 	return;
65 
66 invalid:
67 	nd_print_invalid(ndo);
68 	ND_TCHECK_LEN(bp, length);
69 }
70