LCOV - code coverage report
Current view: top level - source4/heimdal/lib/hcrypto - rand-timer.c (source / functions) Hit Total Coverage
Test: coverage report for abartlet/fix-coverage dd10fb34 Lines: 0 39 0.0 %
Date: 2021-09-23 10:06:22 Functions: 0 9 0.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 1995, 1996, 1997, 1999, 2007 Kungliga Tekniska Högskolan
       3             :  * (Royal Institute of Technology, Stockholm, Sweden).
       4             :  * All rights reserved.
       5             :  *
       6             :  * Redistribution and use in source and binary forms, with or without
       7             :  * modification, are permitted provided that the following conditions
       8             :  * are met:
       9             :  *
      10             :  * 1. Redistributions of source code must retain the above copyright
      11             :  *    notice, this list of conditions and the following disclaimer.
      12             :  *
      13             :  * 2. Redistributions in binary form must reproduce the above copyright
      14             :  *    notice, this list of conditions and the following disclaimer in the
      15             :  *    documentation and/or other materials provided with the distribution.
      16             :  *
      17             :  * 3. Neither the name of the Institute nor the names of its contributors
      18             :  *    may be used to endorse or promote products derived from this software
      19             :  *    without specific prior written permission.
      20             :  *
      21             :  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
      22             :  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      23             :  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
      24             :  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
      25             :  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
      26             :  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
      27             :  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
      28             :  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
      29             :  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
      30             :  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
      31             :  * SUCH DAMAGE.
      32             :  */
      33             : 
      34             : #include <config.h>
      35             : 
      36             : #include <stdio.h>
      37             : #include <stdlib.h>
      38             : #include <rand.h>
      39             : 
      40             : #include <roken.h>
      41             : 
      42             : #include "randi.h"
      43             : 
      44             : #ifndef WIN32 /* don't bother with this on windows */
      45             : 
      46             : static volatile int counter;
      47             : static volatile unsigned char *gdata; /* Global data */
      48             : static volatile int igdata;     /* Index into global data */
      49             : static int gsize;
      50             : 
      51             : static
      52             : RETSIGTYPE
      53           0 : sigALRM(int sig)
      54             : {
      55           0 :     if (igdata < gsize)
      56           0 :         gdata[igdata++] ^= counter & 0xff;
      57             : 
      58             : #ifndef HAVE_SIGACTION
      59             :     signal(SIGALRM, sigALRM); /* Reinstall SysV signal handler */
      60             : #endif
      61           0 :     SIGRETURN(0);
      62             : }
      63             : 
      64             : #ifndef HAVE_SETITIMER
      65             : static void
      66             : pacemaker(struct timeval *tv)
      67             : {
      68             :     fd_set fds;
      69             :     pid_t pid;
      70             :     pid = getppid();
      71             :     while(1){
      72             :         FD_ZERO(&fds);
      73             :         FD_SET(0, &fds);
      74             :         select(1, &fds, NULL, NULL, tv);
      75             :         kill(pid, SIGALRM);
      76             :     }
      77             : }
      78             : #endif
      79             : 
      80             : #ifdef HAVE_SIGACTION
      81             : /* XXX ugly hack, should perhaps use function from roken */
      82             : static RETSIGTYPE
      83           0 : (*fake_signal(int sig, RETSIGTYPE (*f)(int)))(int)
      84             : {
      85             :     struct sigaction sa, osa;
      86           0 :     sa.sa_handler = f;
      87           0 :     sa.sa_flags = 0;
      88           0 :     sigemptyset(&sa.sa_mask);
      89           0 :     sigaction(sig, &sa, &osa);
      90           0 :     return osa.sa_handler;
      91             : }
      92             : #define signal(S, F) fake_signal((S), (F))
      93             : #endif
      94             : 
      95             : #endif /* WIN32*/
      96             : 
      97             : /*
      98             :  *
      99             :  */
     100             : 
     101             : static void
     102           0 : timer_seed(const void *indata, int size)
     103             : {
     104           0 : }
     105             : 
     106             : static int
     107           0 : timer_bytes(unsigned char *outdata, int size)
     108             : {
     109             : #ifdef WIN32
     110             :     return 0;
     111             : #else /* WIN32 */
     112             :     struct itimerval tv, otv;
     113             :     RETSIGTYPE (*osa)(int);
     114             :     int i, j;
     115             : #ifndef HAVE_SETITIMER
     116             :     RETSIGTYPE (*ochld)(int);
     117             :     pid_t pid;
     118             : #endif
     119             : 
     120           0 :     gdata = outdata;
     121           0 :     gsize = size;
     122           0 :     igdata = 0;
     123             : 
     124           0 :     osa = signal(SIGALRM, sigALRM);
     125             : 
     126             :     /* Start timer */
     127           0 :     tv.it_value.tv_sec = 0;
     128           0 :     tv.it_value.tv_usec = 10 * 1000; /* 10 ms */
     129           0 :     tv.it_interval = tv.it_value;
     130             : #ifdef HAVE_SETITIMER
     131           0 :     setitimer(ITIMER_REAL, &tv, &otv);
     132             : #else
     133             :     ochld = signal(SIGCHLD, SIG_IGN);
     134             :     pid = fork();
     135             :     if(pid == -1){
     136             :         signal(SIGCHLD, ochld != SIG_ERR ? ochld : SIG_DFL);
     137             :         des_not_rand_data(data, size);
     138             :         return;
     139             :     }
     140             :     if(pid == 0)
     141             :         pacemaker(&tv.it_interval);
     142             : #endif
     143             : 
     144           0 :     for(i = 0; i < 4; i++) {
     145           0 :         for (igdata = 0; igdata < size;) /* igdata++ in sigALRM */
     146           0 :             counter++;
     147           0 :         for (j = 0; j < size; j++) /* Only use 2 bits each lap */
     148           0 :             gdata[j] = (gdata[j]>>2) | (gdata[j]<<6);
     149             :     }
     150             : #ifdef HAVE_SETITIMER
     151           0 :     setitimer(ITIMER_REAL, &otv, 0);
     152             : #else
     153             :     kill(pid, SIGKILL);
     154             :     while(waitpid(pid, NULL, 0) != pid);
     155             :     signal(SIGCHLD, ochld != SIG_ERR ? ochld : SIG_DFL);
     156             : #endif
     157           0 :     signal(SIGALRM, osa != SIG_ERR ? osa : SIG_DFL);
     158             : 
     159           0 :     return 1;
     160             : #endif
     161             : }
     162             : 
     163             : static void
     164           0 : timer_cleanup(void)
     165             : {
     166           0 : }
     167             : 
     168             : static void
     169           0 : timer_add(const void *indata, int size, double entropi)
     170             : {
     171           0 : }
     172             : 
     173             : static int
     174           0 : timer_pseudorand(unsigned char *outdata, int size)
     175             : {
     176           0 :     return timer_bytes(outdata, size);
     177             : }
     178             : 
     179             : static int
     180           0 : timer_status(void)
     181             : {
     182             : #ifdef WIN32
     183             :     return 0;
     184             : #else
     185           0 :     return 1;
     186             : #endif
     187             : }
     188             : 
     189             : const RAND_METHOD hc_rand_timer_method = {
     190             :     timer_seed,
     191             :     timer_bytes,
     192             :     timer_cleanup,
     193             :     timer_add,
     194             :     timer_pseudorand,
     195             :     timer_status
     196             : };
     197             : 
     198             : const RAND_METHOD *
     199           0 : RAND_timer_method(void)
     200             : {
     201           0 :     return &hc_rand_timer_method;
     202             : }

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