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103 lines
2.2 KiB
103 lines
2.2 KiB
/*
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* ppbloom.c - Ping-Pong Bloom Filter for nonce reuse detection
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*
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* Copyright (C) 2013 - 2018, Max Lv <max.c.lv@gmail.com>
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*
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* This file is part of the shadowsocks-libev.
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*
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* shadowsocks-libev is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* shadowsocks-libev is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with shadowsocks-libev; see the file COPYING. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#include <errno.h>
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#include <stdlib.h>
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#include "bloom.h"
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#include "ppbloom.h"
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#include "utils.h"
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#define PING 0
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#define PONG 1
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static struct bloom ppbloom[2];
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static int bloom_count[2];
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static int current;
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static int entries;
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static double error;
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int
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ppbloom_init(int n, double e)
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{
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int err;
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entries = n / 2;
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error = e;
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err = bloom_init(ppbloom + PING, entries, error);
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if (err)
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return err;
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err = bloom_init(ppbloom + PONG, entries, error);
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if (err)
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return err;
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bloom_count[PING] = 0;
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bloom_count[PONG] = 0;
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current = PING;
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return 0;
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}
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int
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ppbloom_check(const void *buffer, int len)
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{
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int ret;
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ret = bloom_check(ppbloom + PING, buffer, len);
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if (ret)
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return ret;
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ret = bloom_check(ppbloom + PONG, buffer, len);
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if (ret)
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return ret;
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return 0;
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}
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int
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ppbloom_add(const void *buffer, int len)
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{
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int err;
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err = bloom_add(ppbloom + current, buffer, len);
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if (err == -1)
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return err;
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bloom_count[current]++;
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if (bloom_count[current] >= entries) {
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bloom_count[current] = 0;
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current = current == PING ? PONG : PING;
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bloom_free(ppbloom + current);
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bloom_init(ppbloom + current, entries, error);
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}
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return 0;
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}
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void
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ppbloom_free()
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{
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bloom_free(ppbloom + PING);
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bloom_free(ppbloom + PONG);
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}
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