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ircd: Add std::random subsystem and utils.

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This commit is contained in:
Jason Volk 2017-08-19 14:27:51 -06:00
parent b6d51b89dd
commit 48148c640c
6 changed files with 200 additions and 35 deletions
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1
configure.ac
View file

@ -293,6 +293,7 @@ RB_CHK_SYSHEADER([atomic], [ATOMIC])
RB_CHK_SYSHEADER([thread], [THREAD])
RB_CHK_SYSHEADER([mutex], [MUTEX])
RB_CHK_SYSHEADER([condition_variable], [CONDITION_VARIABLE])
RB_CHK_SYSHEADER([random], [RANDOM])
dnl experimental
RB_CHK_SYSHEADER([string_view], [STRING_VIEW])

85
include/ircd/rand.h Normal file
View file

@ -0,0 +1,85 @@
/*
* Copyright (C) 2017 Charybdis Development Team
* Copyright (C) 2017 Jason Volk <jason@zemos.net>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice is present in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
*/
#pragma once
#define HAVE_IRCD_UTIL_RANDOM_H
namespace ircd {
namespace rand {
extern std::random_device device;
extern std::mt19937_64 mt;
namespace dict
{
extern const std::string alnum;
extern const std::string alpha;
extern const std::string upper;
extern const std::string lower;
extern const std::string numeric;
}
uint64_t integer();
uint64_t integer(const uint64_t &min, const uint64_t &max);
// Random character from dictionary
char character(const std::string &dict = dict::alnum);
// Random string of len from dictionary; char buffers null terminated, uchar not.
template<size_t size> string_view string(const std::string &dict, const size_t &len, char (&buf)[size]);
string_view string(const std::string &dict, const size_t &len, char *const &buf, const size_t &max);
string_view string(const std::string &dict, const size_t &len, uint8_t *const &buf);
std::string string(const std::string &dict, const size_t &len);
} // namespace rand
} // namespace ircd
template<size_t size>
ircd::string_view
ircd::rand::string(const std::string &dict,
const size_t &len,
char (&buf)[size])
{
return string(dict, len, buf, size);
}
// Random character from dictionary
inline char
ircd::rand::character(const std::string &dict)
{
assert(!dict.empty());
return dict.at(integer(0, dict.size() - 1));
}
inline uint64_t
ircd::rand::integer(const uint64_t &min,
const uint64_t &max)
{
std::uniform_int_distribution<uint64_t> dist{min, max};
return dist(mt);
}
inline uint64_t
ircd::rand::integer()
{
return mt();
}

2
include/ircd/stdinc.h
View file

@ -82,6 +82,7 @@ extern "C" {
#include <RB_INC_THREAD
#include <RB_INC_MUTEX
#include <RB_INC_CONDITION_VARIABLE
#include <RB_INC_RANDOM
///////////////////////////////////////////////////////////////////////////////
//
@ -176,6 +177,7 @@ struct client;
} // namespace ircd
#include "util.h"
#include "rand.h"
#include "timer.h"
#include "allocator.h"
#include "info.h"

4
ircd/Makefile.am
View file

@ -61,7 +61,9 @@ libircd_la_SOURCES = \
json.cc \
parse.cc \
listen.cc \
matrix.cc
matrix.cc \
rand.cc \
###
if JS
libircd_la_SOURCES += \

37
ircd/ircd.cc
View file

@ -37,8 +37,7 @@ namespace ircd
main_exit_cb main_exit_func; // Called when main context exits
ctx::ctx *main_context; // Reference to main context
void seed_random();
void init_system();
void init_rlimit();
void main_exiting() noexcept;
void main();
}
@ -51,7 +50,7 @@ ircd::init(boost::asio::io_service &io_service,
ircd::ios = &io_service;
main_finish = false;
_main_exited = false;
init_system();
init_rlimit();
// The log is available, but it is console-only until conf opens files.
log::init();
@ -153,19 +152,6 @@ ircd::at_main_exit(main_exit_cb main_exit_func)
ircd::main_exit_func = std::move(main_exit_func);
}
namespace ircd
{
void init_random();
void init_rlimit();
}
void
ircd::init_system()
{
init_rlimit();
init_random();
}
void
#ifdef HAVE_SYS_RESOURCE_H
ircd::init_rlimit()
@ -190,24 +176,7 @@ catch(const std::exception &e)
ircd::init_rlimit()
{
}
#endif
void
ircd::init_random()
{
union
{
char seed_char[4];
int seed_int;
};
std::ifstream s("/dev/urandom");
if(s.good())
s.read(seed_char, sizeof(seed_char));
srand(seed_int);
}
#endif
// namespace ircd {

106
ircd/rand.cc Normal file
View file

@ -0,0 +1,106 @@
/*
* Copyright (C) 2017 Charybdis Development Team
* Copyright (C) 2017 Jason Volk <jason@zemos.net>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice is present in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
*/
decltype(ircd::rand::device) ircd::rand::device
{
// on linux: uses RDRND or /dev/urandom
// on windows: TODO: verify construction source
};
decltype(ircd::rand::mt) ircd::rand::mt
{
device()
};
decltype(ircd::rand::dict::alnum) ircd::rand::dict::alnum
{
"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
};
decltype(ircd::rand::dict::alpha) ircd::rand::dict::alpha
{
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
};
decltype(ircd::rand::dict::upper) ircd::rand::dict::upper
{
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
};
decltype(ircd::rand::dict::lower) ircd::rand::dict::lower
{
"abcdefghijklmnopqrstuvwxyz"
};
decltype(ircd::rand::dict::numeric) ircd::rand::dict::numeric
{
"0123456789"
};
std::string
ircd::rand::string(const std::string &dict,
const size_t &len)
{
std::string ret(len, char());
string(dict, len, reinterpret_cast<uint8_t *>(&ret.front()));
return ret;
}
ircd::string_view
ircd::rand::string(const std::string &dict,
const size_t &len,
char *const &buf,
const size_t &max)
{
if(unlikely(!max))
return { buf, max };
const auto size
{
std::min(len, max - 1)
};
buf[size] = '\0';
return string(dict, size, reinterpret_cast<uint8_t *>(buf));
}
ircd::string_view
ircd::rand::string(const std::string &dict,
const size_t &len,
uint8_t *const &buf)
{
std::uniform_int_distribution<size_t> dist
{
0, dict.size() - 1
};
std::generate(buf, buf + len, [&dict, &dist]
() -> uint8_t
{
return dict.at(dist(mt));
});
return string_view
{
reinterpret_cast<const char *>(buf), len
};
}