158 lines
4.5 KiB
C
158 lines
4.5 KiB
C
/*
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* Copyright (c) 2016-2022, OARC, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __dnscap_dnscap_common_h
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#define __dnscap_dnscap_common_h
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#include <netinet/in.h>
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#include <sys/types.h>
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#ifdef TIME_WITH_SYS_TIME
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#include <sys/time.h>
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#include <time.h>
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#else
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#else
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#include <time.h>
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#endif
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#endif
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/*
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* setup MY_BPFTIMEVAL as the timeval structure that bpf packets
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* will be assoicated with packets from libpcap
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*/
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#ifndef MY_BPFTIMEVAL
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#define MY_BPFTIMEVAL timeval
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#endif
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typedef struct MY_BPFTIMEVAL my_bpftimeval;
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/*
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* Structure to contain IP addresses
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*/
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typedef struct {
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int af;
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union {
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struct in_addr a4;
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struct in6_addr a6;
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} u;
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} iaddr;
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/*
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* Prototype for the plugin "type" function
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*
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* output - Will run plugin's "output" function last when outputting (default
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* and same behavior before the existens of a plugin type)
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* filter - Will run plugin's "filter" function before outputting and won't
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* output if the return of that function is non-zero.
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*/
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enum plugin_type {
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plugin_output,
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plugin_filter,
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};
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typedef enum plugin_type type_t(void);
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/*
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* plugins can call the logerr() function in the main dnscap
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* process.
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*/
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typedef int logerr_t(const char* fmt, ...);
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/*
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* Prototype for the plugin "output" function
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*/
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typedef void output_t(const char* descr,
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iaddr from,
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iaddr to,
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uint8_t proto,
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unsigned flags,
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unsigned sport,
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unsigned dport,
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my_bpftimeval ts,
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const u_char* pkt_copy,
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const unsigned olen,
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const u_char* payload,
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const unsigned payloadlen);
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/*
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* Prototype for the plugin "filter" function
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*/
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typedef int filter_t(const char* descr,
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iaddr* from,
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iaddr* to,
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uint8_t proto,
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unsigned flags,
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unsigned sport,
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unsigned dport,
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my_bpftimeval ts,
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const u_char* pkt_copy,
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const unsigned olen,
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const u_char* payload,
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const unsigned payloadlen);
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/*
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* Extensions
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*/
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#define DNSCAP_EXT_IS_RESPONDER 1
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typedef int (*is_responder_t)(iaddr ia);
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#define DNSCAP_EXT_IA_STR 2
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typedef const char* (*ia_str_t)(iaddr ia);
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#define DNSCAP_EXT_TCPSTATE_GETCURR 3
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typedef void* (*tcpstate_getcurr_t)(void);
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#define DNSCAP_EXT_TCPSTATE_RESET 4
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typedef void (*tcpstate_reset_t)(void* tcpstate, const char* msg);
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#define DNSCAP_EXT_SET_IADDR 5
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typedef void (*set_iaddr_t)(iaddr* from, iaddr* to);
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/*
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* Flags
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*/
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#define DNSCAP_OUTPUT_ISFRAG (1 << 0)
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#define DNSCAP_OUTPUT_ISDNS (1 << 1)
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#define DNSCAP_OUTPUT_ISLAYER (1 << 2)
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/*
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* Direction
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*/
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#define DIR_INITIATE 0x0001
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#define DIR_RESPONSE 0x0002
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#endif /* __dnscap_dnscap_common_h */
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