mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2025-04-26 17:03:43 +02:00
608 lines
18 KiB
C++
608 lines
18 KiB
C++
/*
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* Copyright (c)2013-2020 ZeroTier, Inc.
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file in the project's root directory.
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*
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* Change Date: 2024-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2.0 of the Apache License.
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*/
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/****/
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#ifndef ZT_UTILS_HPP
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#define ZT_UTILS_HPP
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#include "Constants.hpp"
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#include <cstdlib>
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#include <cstring>
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namespace ZeroTier {
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namespace Utils {
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#ifdef ZT_ARCH_X64
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struct CPUIDRegisters
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{
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uint32_t eax,ebx,ecx,edx;
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bool rdrand;
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bool aes;
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CPUIDRegisters();
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};
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extern const CPUIDRegisters CPUID;
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#endif
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/**
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* 256 zero bits / 32 zero bytes
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*/
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extern const uint64_t ZERO256[4];
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/**
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* Hexadecimal characters 0-f
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*/
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extern const char HEXCHARS[16];
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/**
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* Perform a time-invariant binary comparison
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*
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* @param a First binary string
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* @param b Second binary string
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* @param len Length of strings
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* @return True if strings are equal
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*/
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bool secureEq(const void *a,const void *b,unsigned int len) noexcept;
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/**
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* Be absolutely sure to zero memory
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*
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* This uses some hacks to be totally sure the compiler does not optimize it out.
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*
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* @param ptr Memory to zero
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* @param len Length of memory in bytes
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*/
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void burn(void *ptr,unsigned int len);
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/**
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* @param n Number to convert
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* @param s Buffer, at least 24 bytes in size
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* @return String containing 'n' in base 10 form
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*/
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char *decimal(unsigned long n,char s[24]) noexcept;
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/**
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* Convert an unsigned integer into hex
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*
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* @param i Any unsigned integer
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* @param s Buffer to receive hex, must be at least (2*sizeof(i))+1 in size or overflow will occur.
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* @return Pointer to s containing hex string with trailing zero byte
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*/
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char *hex(uint8_t i,char s[3]) noexcept;
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/**
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* Convert an unsigned integer into hex
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*
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* @param i Any unsigned integer
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* @param s Buffer to receive hex, must be at least (2*sizeof(i))+1 in size or overflow will occur.
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* @return Pointer to s containing hex string with trailing zero byte
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*/
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char *hex(uint16_t i,char s[5]) noexcept;
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/**
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* Convert an unsigned integer into hex
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*
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* @param i Any unsigned integer
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* @param s Buffer to receive hex, must be at least (2*sizeof(i))+1 in size or overflow will occur.
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* @return Pointer to s containing hex string with trailing zero byte
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*/
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char *hex(uint32_t i,char s[9]) noexcept;
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/**
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* Convert an unsigned integer into hex
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*
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* @param i Any unsigned integer
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* @param s Buffer to receive hex, must be at least (2*sizeof(i))+1 in size or overflow will occur.
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* @return Pointer to s containing hex string with trailing zero byte
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*/
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char *hex(uint64_t i,char s[17]) noexcept;
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/**
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* Decode an unsigned integer in hex format
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*
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* @param s String to decode, non-hex chars are ignored
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* @return Unsigned integer
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*/
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uint64_t unhex(const char *s) noexcept;
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/**
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* Convert a byte array into hex
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*
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* @param d Bytes
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* @param l Length of bytes
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* @param s String buffer, must be at least (l*2)+1 in size or overflow will occur
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* @return Pointer to filled string buffer
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*/
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char *hex(const void *d,unsigned int l,char *s) noexcept;
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/**
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* Decode a hex string
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*
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* @param h Hex C-string (non hex chars are ignored)
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* @param hlen Maximum length of string (will stop at terminating zero)
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* @param buf Output buffer
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* @param buflen Length of output buffer
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* @return Number of written bytes
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*/
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unsigned int unhex(const char *h,unsigned int hlen,void *buf,unsigned int buflen) noexcept;
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/**
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* Generate secure random bytes
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*
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* This will try to use whatever OS sources of entropy are available. It's
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* guarded by an internal mutex so it's thread-safe.
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*
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* @param buf Buffer to fill
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* @param bytes Number of random bytes to generate
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*/
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void getSecureRandom(void *buf,unsigned int bytes) noexcept;
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/**
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* @return Secure random 64-bit integer
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*/
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uint64_t getSecureRandomU64() noexcept;
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/**
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* Encode string to base32
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*
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* @param data Binary data to encode
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* @param length Length of data in bytes
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* @param result Result buffer
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* @param bufSize Size of result buffer
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* @return Number of bytes written
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*/
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int b32e(const uint8_t *data,int length,char *result,int bufSize) noexcept;
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/**
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* Decode base32 string
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*
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* @param encoded C-string in base32 format (non-base32 characters are ignored)
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* @param result Result buffer
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* @param bufSize Size of result buffer
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* @return Number of bytes written or -1 on error
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*/
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int b32d(const char *encoded, uint8_t *result, int bufSize) noexcept;
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/**
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* Get a non-cryptographic random integer
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*/
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uint64_t random() noexcept;
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/**
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* Perform a safe C string copy, ALWAYS null-terminating the result
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*
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* This will never ever EVER result in dest[] not being null-terminated
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* regardless of any input parameter (other than len==0 which is invalid).
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*
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* @param dest Destination buffer (must not be NULL)
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* @param len Length of dest[] (if zero, false is returned and nothing happens)
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* @param src Source string (if NULL, dest will receive a zero-length string and true is returned)
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* @return True on success, false on overflow (buffer will still be 0-terminated)
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*/
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bool scopy(char *dest,unsigned int len,const char *src) noexcept;
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/**
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* Mix bits in a 64-bit integer
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*
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* https://nullprogram.com/blog/2018/07/31/
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*
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* @param x Integer to mix
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* @return Hashed value
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*/
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static ZT_ALWAYS_INLINE uint64_t hash64(uint64_t x) noexcept
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{
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x ^= x >> 30U;
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x *= 0xbf58476d1ce4e5b9ULL;
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x ^= x >> 27U;
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x *= 0x94d049bb133111ebULL;
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x ^= x >> 31U;
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return x;
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}
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/**
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* @param b Buffer to check
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* @param l Length of buffer
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* @return True if buffer is all zero
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*/
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static ZT_ALWAYS_INLINE bool allZero(const void *const b,const unsigned int l) noexcept
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{
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const uint8_t *x = reinterpret_cast<const uint8_t *>(b);
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const uint8_t *const y = x + l;
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while (x != y) {
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if (*x != 0)
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return false;
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++x;
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}
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return true;
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}
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/**
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* Wrapper around reentrant strtok functions, which differ in name by platform
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*
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* @param str String to tokenize or NULL for subsequent calls
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* @param delim Delimiter
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* @param saveptr Pointer to pointer where function can save state
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* @return Next token or NULL if none
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*/
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static ZT_ALWAYS_INLINE char *stok(char *str,const char *delim,char **saveptr) noexcept
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{
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#ifdef __WINDOWS__
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return strtok_s(str,delim,saveptr);
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#else
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return strtok_r(str,delim,saveptr);
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#endif
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}
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static ZT_ALWAYS_INLINE unsigned int strToUInt(const char *s) noexcept
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{
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return (unsigned int)strtoul(s,nullptr,10);
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}
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static ZT_ALWAYS_INLINE unsigned long long hexStrToU64(const char *s) noexcept
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{
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#ifdef __WINDOWS__
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return (unsigned long long)_strtoui64(s,nullptr,16);
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#else
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return strtoull(s,nullptr,16);
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#endif
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}
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/**
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* Calculate a non-cryptographic hash of a byte string
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*
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* @param key Key to hash
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* @param len Length in bytes
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* @return Non-cryptographic hash suitable for use in a hash table
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*/
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static ZT_ALWAYS_INLINE unsigned long hashString(const void *restrict key,const unsigned int len) noexcept
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{
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const uint8_t *p = reinterpret_cast<const uint8_t *>(key);
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unsigned long h = 0;
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for (unsigned int i=0;i<len;++i) {
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h += p[i];
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h += (h << 10U);
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h ^= (h >> 6U);
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}
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h += (h << 3U);
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h ^= (h >> 11U);
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h += (h << 15U);
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return h;
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}
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#ifdef __GNUC__
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static ZT_ALWAYS_INLINE unsigned int countBits(const uint8_t v) noexcept { return (unsigned int)__builtin_popcount((unsigned int)v); }
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static ZT_ALWAYS_INLINE unsigned int countBits(const uint16_t v) noexcept { return (unsigned int)__builtin_popcount((unsigned int)v); }
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static ZT_ALWAYS_INLINE unsigned int countBits(const uint32_t v) noexcept { return (unsigned int)__builtin_popcountl((unsigned long)v); }
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static ZT_ALWAYS_INLINE unsigned int countBits(const uint64_t v) noexcept{ return (unsigned int)__builtin_popcountll((unsigned long long)v); }
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#else
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template<typename T>
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static ZT_ALWAYS_INLINE unsigned int countBits(T v) noexcept
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{
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v = v - ((v >> 1) & (T)~(T)0/3);
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v = (v & (T)~(T)0/15*3) + ((v >> 2) & (T)~(T)0/15*3);
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v = (v + (v >> 4)) & (T)~(T)0/255*15;
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return (unsigned int)((v * ((~((T)0))/((T)255))) >> ((sizeof(T) - 1) * 8));
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}
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#endif
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/**
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* Unconditionally swap bytes regardless of host byte order
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*
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* @param n Integer to swap
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* @return Integer with bytes reversed
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*/
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static ZT_ALWAYS_INLINE uint64_t swapBytes(const uint64_t n) noexcept
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{
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#ifdef __GNUC__
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return __builtin_bswap64(n);
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#else
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#ifdef _MSC_VER
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return (uint64_t)_byteswap_uint64((unsigned __int64)n);
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#else
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return (
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((n & 0x00000000000000ffULL) << 56) |
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((n & 0x000000000000ff00ULL) << 40) |
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((n & 0x0000000000ff0000ULL) << 24) |
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((n & 0x00000000ff000000ULL) << 8) |
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((n & 0x000000ff00000000ULL) >> 8) |
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((n & 0x0000ff0000000000ULL) >> 24) |
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((n & 0x00ff000000000000ULL) >> 40) |
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((n & 0xff00000000000000ULL) >> 56)
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);
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#endif
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#endif
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}
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/**
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* Unconditionally swap bytes regardless of host byte order
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*
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* @param n Integer to swap
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* @return Integer with bytes reversed
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*/
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static ZT_ALWAYS_INLINE uint32_t swapBytes(const uint32_t n) noexcept
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{
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#if defined(__GCC__)
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return __builtin_bswap32(n);
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#else
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#ifdef _MSC_VER
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return (uint32_t)_byteswap_ulong((unsigned long)n);
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#else
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return htonl(n);
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#endif
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#endif
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}
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/**
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* Unconditionally swap bytes regardless of host byte order
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*
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* @param n Integer to swap
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* @return Integer with bytes reversed
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*/
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static ZT_ALWAYS_INLINE uint16_t swapBytes(const uint16_t n) noexcept
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{
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#if defined(__GCC__)
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return __builtin_bswap16(n);
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#else
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#ifdef _MSC_VER
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return (uint16_t)_byteswap_ushort((unsigned short)n);
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#else
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return htons(n);
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#endif
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#endif
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}
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// ZZvvvzvzvvzzz... moooooo... http://www.catb.org/~esr/jargon/html/Y/yak-shaving.html
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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template<typename I,unsigned int S>
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class _hton_impl { public: static ZT_ALWAYS_INLINE I hton(const I n) { return n; } };
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template<typename I>
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class _hton_impl<I,2> { public: static ZT_ALWAYS_INLINE I hton(const I n) { return (I)swapBytes((uint16_t)n); } };
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template<typename I>
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class _hton_impl<I,4> { public: static ZT_ALWAYS_INLINE I hton(const I n) { return (I)swapBytes((uint32_t)n); } };
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template<typename I>
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class _hton_impl<I,8> { public: static ZT_ALWAYS_INLINE I hton(const I n) { return (I)swapBytes((uint64_t)n); } };
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#endif
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/**
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* Convert any signed or unsigned integer type to big-endian ("network") byte order
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*
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* @tparam I Integer type (usually inferred)
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* @param n Value to convert
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* @return Value in big-endian order
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*/
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template<typename I>
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static ZT_ALWAYS_INLINE I hton(const I n) noexcept
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{
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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return _hton_impl<I,sizeof(I)>::hton(n);
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#else
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return n;
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#endif
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}
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/**
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* Convert any signed or unsigned integer type to host byte order from big-endian ("network") byte order
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*
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* @tparam I Integer type (usually inferred)
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* @param n Value to convert
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* @return Value in host byte order
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*/
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template<typename I>
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static ZT_ALWAYS_INLINE I ntoh(const I n) noexcept
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{
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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return _hton_impl<I,sizeof(I)>::hton(n);
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#else
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return n;
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#endif
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}
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/**
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* Decode a big-endian value from a byte stream
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*
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* @tparam I Type to decode (should be unsigned e.g. uint32_t or uint64_t)
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* @param p Byte stream, must be at least sizeof(I) in size
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* @return Decoded integer
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*/
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template<typename I>
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static ZT_ALWAYS_INLINE I loadBigEndian(const void *const p) noexcept
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{
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#ifdef ZT_NO_UNALIGNED_ACCESS
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if (sizeof(I) == 8) {
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return (I)(
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((uint64_t)reinterpret_cast<const uint8_t *>(p)[0] << 56U) |
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((uint64_t)reinterpret_cast<const uint8_t *>(p)[1] << 48U) |
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((uint64_t)reinterpret_cast<const uint8_t *>(p)[2] << 40U) |
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((uint64_t)reinterpret_cast<const uint8_t *>(p)[3] << 32U) |
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((uint64_t)reinterpret_cast<const uint8_t *>(p)[4] << 24U) |
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((uint64_t)reinterpret_cast<const uint8_t *>(p)[5] << 16U) |
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((uint64_t)reinterpret_cast<const uint8_t *>(p)[6] << 8U) |
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(uint64_t)reinterpret_cast<const uint8_t *>(p)[7]
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);
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} else if (sizeof(I) == 4) {
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return (I)(
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((uint32_t)reinterpret_cast<const uint8_t *>(p)[0] << 24U) |
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((uint32_t)reinterpret_cast<const uint8_t *>(p)[1] << 16U) |
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((uint32_t)reinterpret_cast<const uint8_t *>(p)[2] << 8U) |
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(uint32_t)reinterpret_cast<const uint8_t *>(p)[3]
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);
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} else if (sizeof(I) == 2) {
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return (I)(
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((unsigned int)reinterpret_cast<const uint8_t *>(p)[0] << 8U) |
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(unsigned int)reinterpret_cast<const uint8_t *>(p)[1]
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);
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} else {
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return (I)reinterpret_cast<const uint8_t *>(p)[0];
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}
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#else
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return ntoh(*reinterpret_cast<const I *>(p));
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#endif
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}
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/**
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* Save an integer in big-endian format
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*
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* @tparam I Integer type to store (usually inferred)
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* @param p Byte stream to write (must be at least sizeof(I))
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* #param i Integer to write
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*/
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template<typename I>
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static ZT_ALWAYS_INLINE void storeBigEndian(void *const p,I i) noexcept
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{
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#ifdef ZT_NO_UNALIGNED_ACCESS
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if (sizeof(I) == 8) {
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reinterpret_cast<uint8_t *>(p)[0] = (uint8_t)(reinterpret_cast<uint64_t>(i) >> 56U);
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reinterpret_cast<uint8_t *>(p)[1] = (uint8_t)(reinterpret_cast<uint64_t>(i) >> 48U);
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reinterpret_cast<uint8_t *>(p)[2] = (uint8_t)(reinterpret_cast<uint64_t>(i) >> 40U);
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reinterpret_cast<uint8_t *>(p)[3] = (uint8_t)(reinterpret_cast<uint64_t>(i) >> 32U);
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reinterpret_cast<uint8_t *>(p)[4] = (uint8_t)(reinterpret_cast<uint64_t>(i) >> 24U);
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reinterpret_cast<uint8_t *>(p)[5] = (uint8_t)(reinterpret_cast<uint64_t>(i) >> 16U);
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reinterpret_cast<uint8_t *>(p)[6] = (uint8_t)(reinterpret_cast<uint64_t>(i) >> 8U);
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reinterpret_cast<uint8_t *>(p)[7] = (uint8_t)reinterpret_cast<uint64_t>(i);
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} else if (sizeof(I) == 4) {
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reinterpret_cast<uint8_t *>(p)[0] = (uint8_t)(reinterpret_cast<uint32_t>(i) >> 24U);
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reinterpret_cast<uint8_t *>(p)[1] = (uint8_t)(reinterpret_cast<uint32_t>(i) >> 16U);
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reinterpret_cast<uint8_t *>(p)[2] = (uint8_t)(reinterpret_cast<uint32_t>(i) >> 8U);
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reinterpret_cast<uint8_t *>(p)[3] = (uint8_t)reinterpret_cast<uint32_t>(i);
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} else if (sizeof(I) == 2) {
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reinterpret_cast<uint8_t *>(p)[0] = (uint8_t)(reinterpret_cast<uint16_t>(i) >> 8U);
|
|
reinterpret_cast<uint8_t *>(p)[1] = (uint8_t)reinterpret_cast<uint16_t>(i);
|
|
} else {
|
|
reinterpret_cast<uint8_t *>(p)[0] = (uint8_t)i;
|
|
}
|
|
#else
|
|
*reinterpret_cast<I *>(p) = hton(i);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* Decode a little-endian value from a byte stream
|
|
*
|
|
* @tparam I Type to decode
|
|
* @param p Byte stream, must be at least sizeof(I) in size
|
|
* @return Decoded integer
|
|
*/
|
|
template<typename I>
|
|
static ZT_ALWAYS_INLINE I loadLittleEndian(const void *const p) noexcept
|
|
{
|
|
#if __BYTE_ORDER == __BIG_ENDIAN || defined(ZT_NO_UNALIGNED_ACCESS)
|
|
if (sizeof(I) == 8) {
|
|
return (I)(
|
|
(uint64_t)reinterpret_cast<const uint8_t *>(p)[0] |
|
|
((uint64_t)reinterpret_cast<const uint8_t *>(p)[1] << 8U) |
|
|
((uint64_t)reinterpret_cast<const uint8_t *>(p)[2] << 16U) |
|
|
((uint64_t)reinterpret_cast<const uint8_t *>(p)[3] << 24U) |
|
|
((uint64_t)reinterpret_cast<const uint8_t *>(p)[4] << 32U) |
|
|
((uint64_t)reinterpret_cast<const uint8_t *>(p)[5] << 40U) |
|
|
((uint64_t)reinterpret_cast<const uint8_t *>(p)[6] << 48U) |
|
|
((uint64_t)reinterpret_cast<const uint8_t *>(p)[7] << 56U)
|
|
);
|
|
} else if (sizeof(I) == 4) {
|
|
return (I)(
|
|
(uint32_t)reinterpret_cast<const uint8_t *>(p)[0] |
|
|
((uint32_t)reinterpret_cast<const uint8_t *>(p)[1] << 8U) |
|
|
((uint32_t)reinterpret_cast<const uint8_t *>(p)[2] << 16U) |
|
|
((uint32_t)reinterpret_cast<const uint8_t *>(p)[3] << 24U)
|
|
);
|
|
} else if (sizeof(I) == 2) {
|
|
return (I)(
|
|
(unsigned int)reinterpret_cast<const uint8_t *>(p)[0] |
|
|
((unsigned int)reinterpret_cast<const uint8_t *>(p)[1] << 8U)
|
|
);
|
|
} else {
|
|
return (I)reinterpret_cast<const uint8_t *>(p)[0];
|
|
}
|
|
#else
|
|
return *reinterpret_cast<const I *>(p);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* Save an integer in little-endian format
|
|
*
|
|
* @tparam I Integer type to store (usually inferred)
|
|
* @param p Byte stream to write (must be at least sizeof(I))
|
|
* #param i Integer to write
|
|
*/
|
|
template<typename I>
|
|
static ZT_ALWAYS_INLINE void storeLittleEndian(void *const p,const I i) noexcept
|
|
{
|
|
#if __BYTE_ORDER == __BIG_ENDIAN || defined(ZT_NO_UNALIGNED_ACCESS)
|
|
if (sizeof(I) == 8) {
|
|
reinterpret_cast<uint8_t *>(p)[0] = (uint8_t)reinterpret_cast<uint64_t>(i);
|
|
reinterpret_cast<uint8_t *>(p)[1] = (uint8_t)(reinterpret_cast<uint64_t>(i) >> 8U);
|
|
reinterpret_cast<uint8_t *>(p)[2] = (uint8_t)(reinterpret_cast<uint64_t>(i) >> 16U);
|
|
reinterpret_cast<uint8_t *>(p)[3] = (uint8_t)(reinterpret_cast<uint64_t>(i) >> 24U);
|
|
reinterpret_cast<uint8_t *>(p)[4] = (uint8_t)(reinterpret_cast<uint64_t>(i) >> 32U);
|
|
reinterpret_cast<uint8_t *>(p)[5] = (uint8_t)(reinterpret_cast<uint64_t>(i) >> 40U);
|
|
reinterpret_cast<uint8_t *>(p)[6] = (uint8_t)(reinterpret_cast<uint64_t>(i) >> 48U);
|
|
reinterpret_cast<uint8_t *>(p)[7] = (uint8_t)(reinterpret_cast<uint64_t>(i) >> 56U);
|
|
} else if (sizeof(I) == 4) {
|
|
reinterpret_cast<uint8_t *>(p)[0] = (uint8_t)reinterpret_cast<uint32_t>(i);
|
|
reinterpret_cast<uint8_t *>(p)[1] = (uint8_t)(reinterpret_cast<uint32_t>(i) >> 8U);
|
|
reinterpret_cast<uint8_t *>(p)[2] = (uint8_t)(reinterpret_cast<uint32_t>(i) >> 16U);
|
|
reinterpret_cast<uint8_t *>(p)[3] = (uint8_t)(reinterpret_cast<uint32_t>(i) >> 24U);
|
|
} else if (sizeof(I) == 2) {
|
|
reinterpret_cast<uint8_t *>(p)[0] = (uint8_t)reinterpret_cast<uint16_t>(i);
|
|
reinterpret_cast<uint8_t *>(p)[1] = (uint8_t)(reinterpret_cast<uint16_t>(i) >> 8U);
|
|
} else {
|
|
reinterpret_cast<uint8_t *>(p)[0] = (uint8_t)i;
|
|
}
|
|
#else
|
|
*reinterpret_cast<I *>(p) = i;
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* Copy bits from memory into an integer type without modifying their order
|
|
*
|
|
* @tparam I Type to load
|
|
* @param p Byte stream, must be at least sizeof(I) in size
|
|
* @return Loaded raw integer
|
|
*/
|
|
template<typename I>
|
|
static ZT_ALWAYS_INLINE I loadAsIsEndian(const void *const p) noexcept
|
|
{
|
|
#ifdef ZT_NO_UNALIGNED_ACCESS
|
|
I x = (I)0;
|
|
for(unsigned int k=0;k<sizeof(I);++k)
|
|
reinterpret_cast<uint8_t *>(&x)[k] = reinterpret_cast<const uint8_t *>(p)[k];
|
|
return x;
|
|
#else
|
|
return *reinterpret_cast<const I *>(p);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* Copy bits from memory into an integer type without modifying their order
|
|
*
|
|
* @tparam I Type to store
|
|
* @param p Byte array (must be at least sizeof(I))
|
|
* @param i Integer to store
|
|
*/
|
|
template<typename I>
|
|
static ZT_ALWAYS_INLINE void storeAsIsEndian(void *const p,const I i) noexcept
|
|
{
|
|
#ifdef ZT_NO_UNALIGNED_ACCESS
|
|
for(unsigned int k=0;k<sizeof(I);++k)
|
|
reinterpret_cast<uint8_t *>(p)[k] = reinterpret_cast<const uint8_t *>(&i)[k];
|
|
#else
|
|
*reinterpret_cast<I *>(p) = i;
|
|
#endif
|
|
}
|
|
|
|
} // namespace Utils
|
|
|
|
} // namespace ZeroTier
|
|
|
|
#endif
|