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// Copyright 2018 LEXUGE // This file is part of lib_blaster. // lib_blaster is free software: you can redistribute it and/or modify // it under the terms of the GNU Affero General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // lib_blaster 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 Affero General Public License for more details. // You should have received a copy of the GNU Affero General Public License // along with lib_blaster. If not, see <https://www.gnu.org/licenses/>. //! Some useful tools when construting packet use rand; use rand::distributions::uniform::SampleUniform; use rand::distributions::Distribution; use rand::distributions::Standard; use rand::prng::XorShiftRng; use rand::rngs::EntropyRng; use rand::Rng; use rand::SeedableRng; use std::net::Ipv4Addr; /// A very fast but not secure guaranteed random number generator by using [Xorshift algorithm](https://en.wikipedia.org/wiki/Xorshift) /// /// Same usage as `rand::random()`. pub fn fast_random<T>() -> Result<T, rand::Error> where T: PartialOrd + SampleUniform, Standard: Distribution<T>, { let mut rng = XorShiftRng::from_rng(EntropyRng::new())?; Ok(rng.gen()) } /// Generate random IPv4 address by calling `fast_random` pub fn rand_ipv4() -> Result<Ipv4Addr, rand::Error> { Ok(Ipv4Addr::new( fast_random::<u8>()?, fast_random::<u8>()?, fast_random::<u8>()?, fast_random::<u8>()?, )) }