Changeset 5eab298f
- Timestamp:
- 2015-01-26T03:27:24Z (10 years ago)
- Branches:
- master
- Children:
- 73ee390
- Parents:
- 11e7828
- git-author:
- dequis <dx@…> (10-07-14 11:07:51)
- git-committer:
- dequis <dx@…> (26-01-15 03:27:24)
- Files:
-
- 3 edited
Legend:
- Unmodified
- Added
- Removed
-
bitlbee.c
r11e7828 r5eab298f 329 329 irc_t *irc; 330 330 331 /* Since we're fork()ing here, let's make sure we won't332 get the same random numbers as the parent/siblings. */333 srand( time( NULL ) ^ getpid() );334 335 331 b_main_init(); 336 332 -
lib/misc.c
r11e7828 r5eab298f 414 414 } 415 415 416 /* A pretty reliable random number generator. Tries to use the /dev/random 417 devices first, and falls back to the random number generator from libc 418 when it fails. Opens randomizer devices with O_NONBLOCK to make sure a 419 lack of entropy won't halt BitlBee. */ 416 /* A wrapper for /dev/urandom. 417 * If /dev/urandom is not present or not usable, it calls abort() 418 * to prevent bitlbee from working without a decent entropy source */ 420 419 void random_bytes( unsigned char *buf, int count ) 421 420 { 422 static int use_dev = -1; 423 424 /* Actually this probing code isn't really necessary, is it? */ 425 if( use_dev == -1 ) 426 { 427 if( access( "/dev/random", R_OK ) == 0 || access( "/dev/urandom", R_OK ) == 0 ) 428 use_dev = 1; 429 else 430 { 431 use_dev = 0; 432 srand( ( getpid() << 16 ) ^ time( NULL ) ); 433 } 434 } 435 436 if( use_dev ) 437 { 438 int fd; 439 440 /* At least on Linux, /dev/random can block if there's not 441 enough entropy. We really don't want that, so if it can't 442 give anything, use /dev/urandom instead. */ 443 if( ( fd = open( "/dev/random", O_RDONLY | O_NONBLOCK ) ) >= 0 ) 444 if( read( fd, buf, count ) == count ) 445 { 446 close( fd ); 447 return; 448 } 449 close( fd ); 450 451 /* urandom isn't supposed to block at all, but just to be 452 sure. If it blocks, we'll disable use_dev and use the libc 453 randomizer instead. */ 454 if( ( fd = open( "/dev/urandom", O_RDONLY | O_NONBLOCK ) ) >= 0 ) 455 if( read( fd, buf, count ) == count ) 456 { 457 close( fd ); 458 return; 459 } 460 close( fd ); 461 462 /* If /dev/random blocks once, we'll still try to use it 463 again next time. If /dev/urandom also fails for some 464 reason, stick with libc during this session. */ 465 466 use_dev = 0; 467 srand( ( getpid() << 16 ) ^ time( NULL ) ); 468 } 469 470 if( !use_dev ) 471 { 472 int i; 473 474 /* Possibly the LSB of rand() isn't very random on some 475 platforms. Seems okay on at least Linux and OSX though. */ 476 for( i = 0; i < count; i ++ ) 477 buf[i] = rand() & 0xff; 478 } 421 int fd; 422 if( ( ( fd = open( "/dev/urandom", O_RDONLY ) ) == -1 ) || 423 ( read( fd, buf, count ) == -1 ) ) 424 { 425 log_message( LOGLVL_ERROR, "/dev/urandom not present - aborting" ); 426 abort(); 427 } 428 429 close( fd ); 479 430 } 480 431 -
unix.c
r11e7828 r5eab298f 87 87 #endif 88 88 89 srand( time( NULL ) ^ getpid() );90 91 89 global.helpfile = g_strdup( HELP_FILE ); 92 90 if( help_init( &global.help, global.helpfile ) == NULL )
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