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| 19:32.28 | seanbright | ast_random() seems weird to me. it returns a long int, but only the lower 32 bits are non-zero. |
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| 19:33.36 | rmudgett | long int is still 32 bits. Did you mean long long int? |
| 19:33.48 | seanbright | i may have |
| 19:33.56 | seanbright | let me look again |
| 19:34.57 | seanbright | sizeof(long int) returns 8 on my machine |
| 19:36.15 | rmudgett | ast_random() is just a wrapper around random() which simply returns a long. |
| 19:36.19 | coreyfarrell | seanbright: specs for C require that long int be at least 32-bit, but allows it to be larger. |
| 19:37.55 | seanbright | rmudgett: it's more than a wrapper around random(). it reads /dev/urandom directly. |
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| 19:38.21 | seanbright | well, we should maybe document that there are only 4 bytes worth of random data returned. |
| 19:38.34 | seanbright | not it |
| 19:38.49 | jameswf | https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=2ahUKEwi4_5bvjKLdAhW-HDQIHZIjD2MQjRx6BAgBEAU&url=https%3A%2F%2Fwww.random.org%2Fanalysis%2F&psig=AOvVaw2F6Mhf2nv0XriqrF7Eh4lh&ust=1536176316047465 |
| 19:39.13 | jameswf | https://usercontent.irccloud-cdn.com/file/CIi7wAJl/image.png |
| 19:39.26 | seanbright | that was helpful, thanks. |
| 19:39.47 | jameswf | has done his deed for the day |
| 19:42.51 | jameswf | the manual page for /dev/*random doesn't even mention block size |
| 19:43.09 | seanbright | it has nothing to do with /dev/urandom |
| 19:44.05 | seanbright | it would probably be fine without the modulo stuff in the ast_random() function |
| 19:44.39 | jameswf | """ A read from the /dev/urandom device will not block waiting for more entropy, but will only return random bytes with a maximum of 32MB per read""" |
| 19:44.45 | seanbright | ... |
| 19:44.52 | jameswf | so it gives what it is asked for up to 32M |
| 19:45.04 | rmudgett | ast_random uses the dev_urandom_fd only if it is opened otherwise it uses random() |
| 19:45.17 | seanbright | sigh |
| 19:46.08 | seanbright | and it's opened during asterisk startup |
| 19:46.19 | jameswf | sorry you mentioned documentation so my ADHD was curious if it was independently documented (not just a todo for here) |
| 19:46.55 | seanbright | maybe now someone can link to documentation for the open() call? |
| 19:47.02 | seanbright | or something equally irrelevant? |
| 19:47.13 | jameswf | lmgtfy :) |
| 19:48.59 | seanbright | so, ast_random() returns 32 bits of random data, regardless of the size of long int |
| 19:51.20 | seanbright | git blame seems to indicate that the modulo stuff in that function was put there specifically to enforce that |
| 19:51.36 | seanbright | because RAND_MAX |
| 19:52.26 | coreyfarrell | looks the modulo stuff forces it to replicate results of random(). also if I'm reading correctly ast_random() only returns 31-bits of random data. |
| 19:52.35 | seanbright | so while it's not a wrapper around random(), it's behavior is designed to mimic random() |
| 19:53.36 | seanbright | yeah, RAND_MAX is 2^31 i think |
| 19:54.41 | seanbright | 2^31-1 |
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