Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame^] | 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 | */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 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) \ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame^] | 38 | (((((u_int)(y))&0xff)<<24) | \ |
| 39 | ((((u_int)(y))&0xff00)<<8) | \ |
| 40 | ((((u_int)(y))&0xff0000)>>8) | \ |
| 41 | ((((u_int)(y))>>24)&0xff)) |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 42 | #define SWAPSHORT(y) \ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame^] | 43 | ((u_short)(((((u_int)(y))&0xff)<<8) | \ |
| 44 | ((((u_int)(y))&0xff00)>>8))) |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 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); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame^] | 52 | |
| 53 | extern u_int max_snaplen_for_dlt(int dlt); |