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Try reopening /dev/urandom if there is a problem.

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This commit is contained in:
Adam Ierymenko 2015-10-06 18:10:40 -07:00
parent 64aaea3978
commit 598a1d8dd7
1 changed files with 11 additions and 5 deletions
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16
node/Utils.cpp
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@ -181,7 +181,7 @@ void Utils::getSecureRandom(void *buf,unsigned int bytes)
#ifdef __UNIX_LIKE__ #ifdef __UNIX_LIKE__
static char randomBuf[65536]; static char randomBuf[131072];
static unsigned int randomPtr = sizeof(randomBuf); static unsigned int randomPtr = sizeof(randomBuf);
static int devURandomFd = -1; static int devURandomFd = -1;
static Mutex globalLock; static Mutex globalLock;
@ -199,10 +199,16 @@ void Utils::getSecureRandom(void *buf,unsigned int bytes)
for(unsigned int i=0;i<bytes;++i) { for(unsigned int i=0;i<bytes;++i) {
if (randomPtr >= sizeof(randomBuf)) { if (randomPtr >= sizeof(randomBuf)) {
if ((int)::read(devURandomFd,randomBuf,sizeof(randomBuf)) != (int)sizeof(randomBuf)) { for(;;) {
fprintf(stderr,"FATAL ERROR: Utils::getSecureRandom() unable to read from /dev/urandom\n"); if ((int)::read(devURandomFd,randomBuf,sizeof(randomBuf)) != (int)sizeof(randomBuf)) {
exit(1); ::close(devURandomFd);
return; devURandomFd = ::open("/dev/urandom",O_RDONLY);
if (devURandomFd <= 0) {
fprintf(stderr,"FATAL ERROR: Utils::getSecureRandom() unable to open /dev/urandom\n");
exit(1);
return;
}
} else break;
} }
randomPtr = 0; randomPtr = 0;
} }