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/*
* Copyright (c) 2016-2021, OARC, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef __dnscap_dnscap_common_h
#define __dnscap_dnscap_common_h
#include <netinet/in.h>
#include <sys/types.h>
#ifdef TIME_WITH_SYS_TIME
#include <sys/time.h>
#include <time.h>
#else
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#else
#include <time.h>
#endif
#endif
/*
* setup MY_BPFTIMEVAL as the timeval structure that bpf packets
* will be assoicated with packets from libpcap
*/
#ifndef MY_BPFTIMEVAL
#define MY_BPFTIMEVAL timeval
#endif
typedef struct MY_BPFTIMEVAL my_bpftimeval;
/*
* Structure to contain IP addresses
*/
typedef struct {
int af;
union {
struct in_addr a4;
struct in6_addr a6;
} u;
} iaddr;
/*
* Prototype for the plugin "type" function
*
* output - Will run plugin's "output" function last when outputting (default
* and same behavior before the existens of a plugin type)
* filter - Will run plugin's "filter" function before outputting and won't
* output if the return of that function is non-zero.
*/
enum plugin_type {
plugin_output,
plugin_filter,
};
typedef enum plugin_type type_t(void);
/*
* plugins can call the logerr() function in the main dnscap
* process.
*/
typedef int logerr_t(const char* fmt, ...);
/*
* Prototype for the plugin "output" function
*/
typedef void output_t(const char* descr,
iaddr from,
iaddr to,
uint8_t proto,
unsigned flags,
unsigned sport,
unsigned dport,
my_bpftimeval ts,
const u_char* pkt_copy,
const unsigned olen,
const u_char* payload,
const unsigned payloadlen);
/*
* Prototype for the plugin "filter" function
*/
typedef int filter_t(const char* descr,
iaddr* from,
iaddr* to,
uint8_t proto,
unsigned flags,
unsigned sport,
unsigned dport,
my_bpftimeval ts,
const u_char* pkt_copy,
const unsigned olen,
const u_char* payload,
const unsigned payloadlen);
/*
* Extensions
*/
#define DNSCAP_EXT_IS_RESPONDER 1
typedef int (*is_responder_t)(iaddr ia);
#define DNSCAP_EXT_IA_STR 2
typedef const char* (*ia_str_t)(iaddr ia);
#define DNSCAP_EXT_TCPSTATE_GETCURR 3
typedef void* (*tcpstate_getcurr_t)(void);
#define DNSCAP_EXT_TCPSTATE_RESET 4
typedef void (*tcpstate_reset_t)(void* tcpstate, const char* msg);
#define DNSCAP_EXT_SET_IADDR 5
typedef void (*set_iaddr_t)(iaddr* from, iaddr* to);
/*
* Flags
*/
#define DNSCAP_OUTPUT_ISFRAG (1 << 0)
#define DNSCAP_OUTPUT_ISDNS (1 << 1)
#define DNSCAP_OUTPUT_ISLAYER (1 << 2)
/*
* Direction
*/
#define DIR_INITIATE 0x0001
#define DIR_RESPONSE 0x0002
#endif /* __dnscap_dnscap_common_h */
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