libpcap  1.10.1
About: libpcap is a packet filter library used by tools like tcpdump.
  Fossies Dox: libpcap-1.10.1.tar.gz  ("unofficial" and yet experimental doxygen-generated source code documentation)  

pcap-common.h
Go to the documentation of this file.
1 /*
2  * Copyright (c) 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  * pcap-common.h - common code for pcap and pcapng files
22  */
23 
24 /*
25  * We use the "receiver-makes-right" approach to byte order,
26  * because time is at a premium when we are writing the file.
27  * In other words, the pcap_file_header and pcap_pkthdr,
28  * records are written in host byte order.
29  * Note that the bytes of packet data are written out in the order in
30  * which they were received, so multi-byte fields in packets are not
31  * written in host byte order, they're written in whatever order the
32  * sending machine put them in.
33  *
34  * ntoh[ls] aren't sufficient because we might need to swap on a big-endian
35  * machine (if the file was written in little-end order).
36  */
37 #define SWAPLONG(y) \
38  (((((u_int)(y))&0xff)<<24) | \
39  ((((u_int)(y))&0xff00)<<8) | \
40  ((((u_int)(y))&0xff0000)>>8) | \
41  ((((u_int)(y))>>24)&0xff))
42 #define SWAPSHORT(y) \
43  ((u_short)(((((u_int)(y))&0xff)<<8) | \
44  ((((u_int)(y))&0xff00)>>8)))
45 
46 extern int dlt_to_linktype(int dlt);
47 
48 extern int linktype_to_dlt(int linktype);
49 
50 extern void swap_pseudo_headers(int linktype, struct pcap_pkthdr *hdr,
51  u_char *data);
52 
53 extern u_int max_snaplen_for_dlt(int dlt);
int linktype_to_dlt(int linktype)
Definition: pcap-common.c:1311
u_int max_snaplen_for_dlt(int dlt)
Definition: pcap-common.c:1377
int dlt_to_linktype(int dlt)
Definition: pcap-common.c:1271
void swap_pseudo_headers(int linktype, struct pcap_pkthdr *hdr, u_char *data)
Definition: pcap-common.c:1651