dhcp_protect/dhcp_protect.h

//   Copyright 2019 Pascal Gloor
//
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.

typedef struct dp_conf {
	int pktint;
	int interval;
	int debug;
	int bltime;
	int queue;
	int dryrun;
} dp_conf;

typedef struct dp_accounting {
	unsigned char remoteid[256];
	int len;
	int count;
	UT_hash_handle hh;
} dp_accounting;

typedef struct dp_blacklist {
	unsigned char remoteid[256];
	int len;
	time_t expire;
	UT_hash_handle hh;
} dp_blacklist;

// global hash lists
static dp_accounting *accountings = NULL;
static dp_blacklist *blacklists = NULL;
// timestamp for cleanup interval
static time_t dp_accountingtime = 0;
static time_t dp_cleanuptime = 0;

static int dp_callback (
	struct nfq_q_handle*,
	struct nfgenmsg*,
	struct nfq_data*,
	void*);

void       usage               (char*);
int        dhcp_check          (struct nfq_data*, dp_conf*);
dp_conf   *load_config         (dp_conf*, char*);
void       nfq_start           (dp_conf*);
void       dp_accounting_add   (dp_conf*, unsigned char *, int);
int        dp_accounting_check (dp_conf*, unsigned char *, int);
void       dp_blacklist_add    (dp_conf*, unsigned char *, int);
int        dp_blacklist_check  (dp_conf*, unsigned char *, int);
void       dp_hash_cleanup     (dp_conf*);
void       dp_log              (unsigned char *, int, char *, ...);