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cache.h
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cache.h
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/* $Id$ */
/*
* Copyright (c) 2001-2010 Aaron Turner <aturner at synfin dot net>
* Copyright (c) 2013-2017 Fred Klassen <tcpreplay at appneta dot com> - AppNeta
*
* The Tcpreplay Suite of tools is free software: you can redistribute it
* and/or modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or with the authors permission any later version.
*
* The Tcpreplay Suite is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with the Tcpreplay Suite. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __CACHE_H__
#define __CACHE_H__
#define CACHEMAGIC "tcpprep"
#define CACHEVERSION "04"
#define CACHEDATASIZE 255
#define CACHE_PACKETS_PER_BYTE 4 /* number of packets / byte */
#define CACHE_BITS_PER_PACKET 2 /* number of bits / packet */
#define SEND 1
#define DONT_SEND 0
/*
* CACHEVERSION History:
* 01 - Inital release. 1 bit of data/packet (primary or secondary nic)
* 02 - 2 bits of data/packet (drop/send & primary or secondary nic)
* 03 - Write integers in network-byte order
* 04 - Increase num_packets from 32 to 64 bit integer
*/
struct tcpr_cache_s {
char data[CACHEDATASIZE];
unsigned int packets; /* number of packets tracked in data */
struct tcpr_cache_s *next;
};
typedef struct tcpr_cache_s tcpr_cache_t;
/*
* Each byte in cache_type.data represents CACHE_PACKETS_PER_BYTE (4) number of packets
* Each packet has CACHE_BITS_PER_PACKETS (2) bits of data.
* High Bit: 1 = send, 0 = don't send
* Low Bit: 1 = primary interface, 0 = secondary interface
*/
/*
* cache_file_header Data structure defining a file as a tcpprep cache file
* and it's version
*
* If you need to enhance this struct, do so AFTER the version field and be sure
* to increment CACHEVERSION
*/
struct tcpr_cache_file_hdr_s {
char magic[8];
char version[4];
/* begin version 2 features */
/* version 3 puts everything in network-byte order */
/* version 4 makes num_packets a 64 bit int */
u_int64_t num_packets; /* total # of packets in file */
u_int16_t packets_per_byte;
u_int16_t comment_len; /* how long is the user comment? */
} __attribute__((__packed__));
typedef struct tcpr_cache_file_hdr_s tcpr_cache_file_hdr_t;
enum tcpr_dir_e {
TCPR_DIR_ERROR = -1,
TCPR_DIR_NOSEND = 0,
TCPR_DIR_C2S = 1, /* aka PRIMARY */
TCPR_DIR_S2C = 2 /* aka SECONDARY */
};
typedef enum tcpr_dir_e tcpr_dir_t;
COUNTER write_cache(tcpr_cache_t *, const int, COUNTER, char *);
tcpr_dir_t add_cache(tcpr_cache_t **, const int, const tcpr_dir_t);
COUNTER read_cache(char **, const char *, char **);
tcpr_dir_t check_cache(char *, COUNTER);
/* return values for check_cache
#define CACHE_ERROR -1
#define CACHE_NOSEND 0 // NULL
#define CACHE_PRIMARY 1
#define CACHE_SECONDARY 2
*/
/* macro to change a bitstring to 8 bits */
#define BIT_STR(x) x[0], x[1], x[2], x[3], x[4], x[5], x[6], x[7]
/* string of 8 zeros */
#define EIGHT_ZEROS "\060\060\060\060\060\060\060\060"
#endif