nexmon – Blame information for rev 1

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1 office 1 /*
2 * Copyright (c) 1991, 1993, 1994, 1995, 1996, 1997
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 */
21  
22 #define NETDISSECT_REWORKED
23 #ifdef HAVE_CONFIG_H
24 #include "config.h"
25 #endif
26  
27 #include <tcpdump-stdinc.h>
28  
29 #include <string.h>
30  
31 #include "interface.h"
32 #include "af.h"
33  
34 /*
35 * The DLT_NULL packet header is 4 bytes long. It contains a host-byte-order
36 * 32-bit integer that specifies the family, e.g. AF_INET.
37 *
38 * Note here that "host" refers to the host on which the packets were
39 * captured; that isn't necessarily *this* host.
40 *
41 * The OpenBSD DLT_LOOP packet header is the same, except that the integer
42 * is in network byte order.
43 */
44 #define NULL_HDRLEN 4
45  
46 /*
47 * Byte-swap a 32-bit number.
48 * ("htonl()" or "ntohl()" won't work - we want to byte-swap even on
49 * big-endian platforms.)
50 */
51 #define SWAPLONG(y) \
52 ((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff))
53  
54 static inline void
55 null_hdr_print(netdissect_options *ndo, u_int family, u_int length)
56 {
57 if (!ndo->ndo_qflag) {
58 ND_PRINT((ndo, "AF %s (%u)",
59 tok2str(bsd_af_values,"Unknown",family),family));
60 } else {
61 ND_PRINT((ndo, "%s",
62 tok2str(bsd_af_values,"Unknown AF %u",family)));
63 }
64  
65 ND_PRINT((ndo, ", length %u: ", length));
66 }
67  
68 /*
69 * This is the top level routine of the printer. 'p' points
70 * to the ether header of the packet, 'h->ts' is the timestamp,
71 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
72 * is the number of bytes actually captured.
73 */
74 u_int
75 null_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
76 {
77 u_int length = h->len;
78 u_int caplen = h->caplen;
79 u_int family;
80  
81 if (caplen < NULL_HDRLEN) {
82 ND_PRINT((ndo, "[|null]"));
83 return (NULL_HDRLEN);
84 }
85  
86 memcpy((char *)&family, (char *)p, sizeof(family));
87  
88 /*
89 * This isn't necessarily in our host byte order; if this is
90 * a DLT_LOOP capture, it's in network byte order, and if
91 * this is a DLT_NULL capture from a machine with the opposite
92 * byte-order, it's in the opposite byte order from ours.
93 *
94 * If the upper 16 bits aren't all zero, assume it's byte-swapped.
95 */
96 if ((family & 0xFFFF0000) != 0)
97 family = SWAPLONG(family);
98  
99 if (ndo->ndo_eflag)
100 null_hdr_print(ndo, family, length);
101  
102 length -= NULL_HDRLEN;
103 caplen -= NULL_HDRLEN;
104 p += NULL_HDRLEN;
105  
106 switch (family) {
107  
108 case BSD_AFNUM_INET:
109 ip_print(ndo, p, length);
110 break;
111  
112 case BSD_AFNUM_INET6_BSD:
113 case BSD_AFNUM_INET6_FREEBSD:
114 case BSD_AFNUM_INET6_DARWIN:
115 ip6_print(ndo, p, length);
116 break;
117  
118 case BSD_AFNUM_ISO:
119 isoclns_print(ndo, p, length, caplen);
120 break;
121  
122 case BSD_AFNUM_APPLETALK:
123 atalk_print(ndo, p, length);
124 break;
125  
126 case BSD_AFNUM_IPX:
127 ipx_print(ndo, p, length);
128 break;
129  
130 default:
131 /* unknown AF_ value */
132 if (!ndo->ndo_eflag)
133 null_hdr_print(ndo, family, length + NULL_HDRLEN);
134 if (!ndo->ndo_suppress_default_print)
135 ND_DEFAULTPRINT(p, caplen);
136 }
137  
138 return (NULL_HDRLEN);
139 }
140  
141 /*
142 * Local Variables:
143 * c-style: whitesmith
144 * c-basic-offset: 8
145 * End:
146 */