sysdep.cpp

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/*
 * Copyright (c) 1990- 1993, 1996 Open Software Foundation, Inc.
 * Copyright (c) 1989 by Hewlett-Packard Company, Palo Alto, Ca. &
 * Digital Equipment Corporation, Maynard, Mass.
 * Copyright (c) 1998 Microsoft.
 * Copyright (C) 2021+ GPL 3 and higher by Ingo Höft, <Ingo@Hoeft-online.de>
 * Redistribution only with this Copyright remark. Last modified: 2025-07-18
 * To anyone who acknowledges that this file is provided "AS IS"
 * without any express or implied warranty: permission to use, copy,
 * modify, and distribute this file for any purpose is hereby
 * granted without fee, provided that the above copyright notices and
 * this notice appears in all source code copies, and that none of
 * the names of Open Software Foundation, Inc., Hewlett-Packard
 * Company, or Digital Equipment Corporation be used in advertising
 * or publicity pertaining to distribution of the software without
 * specific, written prior permission.  Neither Open Software
 * Foundation, Inc., Hewlett-Packard Company, Microsoft, nor Digital Equipment
 * Corporation makes any representations about the suitability of
 * this software for any purpose.
 */
// Last compare with ./Pupnp source file on 2025-07-18, ver 1.14.21
 
#ifdef _WIN32
// enable "save" rand_s(), only defined on win32.
#define _CRT_RAND_S
#endif
 
#include <sysdep.hpp>
#include <UPnPsdk/port_sock.hpp>
 
#include <cstring>
 
void get_ieee_node_identifier(uuid_node_t* node) {
    unsigned char seed[16];
    static int inited = 0;
    static uuid_node_t saved_node;
 
    if (!inited) {
        get_random_info(seed);
        seed[0] |= 0x80;
        memcpy(&saved_node, seed, sizeof(uuid_node_t));
        inited = 1;
    }
    *node = saved_node;
}
 
#ifdef _WIN32
 
void get_system_time(uuid_time_t* uuid_time) {
    ULARGE_INTEGER time;
 
    GetSystemTimeAsFileTime((FILETIME*)&time);
    /*
       NT keeps time in FILETIME format which is 100ns ticks since
       Jan 1, 1601.  UUIDs use time in 100ns ticks since Oct 15, 1582.
       The difference is 17 Days in Oct + 30 (Nov) + 31 (Dec)
       + 18 years and 5 leap days.
     */
    time.QuadPart +=
        (unsigned __int64)(1000 * 1000 * 10)               /* seconds */
        * (unsigned __int64)(60 * 60 * 24)                 /* days */
        * (unsigned __int64)(17 + 30 + 31 + 365 * 18 + 5); /* # of days */
    *uuid_time = time.QuadPart;
};
 
void get_random_info(unsigned char seed[16]) {
    int i;
    for (i = 0; i < 16; i++) {
        unsigned int number;
        rand_s(&number);
        seed[i] = (unsigned char)number;
    }
};
 
#else  /* _WIN32 */
 
void get_system_time(uuid_time_t* uuid_time) {
    struct timeval tp;
 
    gettimeofday(&tp, (struct timezone*)0);
    /* Offset between UUID formatted times and Unix formatted times.
     * UUID UTC base time is October 15, 1582.
     * Unix base time is January 1, 1970. */
    *uuid_time = (uuid_time_t)tp.tv_sec * 10000000 +
                 (uuid_time_t)tp.tv_usec * 10 + 0x01B21DD213814000L;
}
 
constexpr int HOSTNAME_LENGTH{255};
 
void get_random_info(unsigned char seed[16]) {
    MD5_CTX c;
    typedef struct {
        /*struct sysinfo s; */
        struct timeval t;
        char hostname[HOSTNAME_LENGTH + 1];
    } randomness;
    randomness r;
 
    /* Initialize memory area so that valgrind does not complain. */
    memset(&r, 0, sizeof r);
 
    /* Get some random stuff. */
    gettimeofday(&r.t, (struct timezone*)0);
    gethostname(r.hostname, HOSTNAME_LENGTH);
 
    /* MD5 it */
    MD5Init(&c);
    MD5Update(&c, (unsigned char*)&r, sizeof r);
    MD5Final(seed, &c);
}
 
#endif /* _WIN32 */