[Freeswitch-dev] switch_stun_random_string returns identical strings on two calls randomly

31 Jan 2012

      Hi, 

I tried to replace the following function which I copied somewhere in msrp.c with  switch_stun_random_string (http://docs.freeswitch.org/group__stun1.html#geb124530a232d65edc508afd1b9dd6...) but I found sometimes switch_stun_random_string (http://docs.freeswitch.org/group__stun1.html#geb124530a232d65edc508afd1b9dd6...) returns identical strings on two sequential calls, with the following function I never found, so I still use it.

By looking the code I understand srand seed is time based so it's possible to return duplicate random string, but I found switch_stun_random_string (http://docs.freeswitch.org/group__stun1.html#geb124530a232d65edc508afd1b9dd6...) used in some places other than stun, just curious would it cause problems?

void random_string(char *buf, switch_size_t size)
{
long val[4];
int x;

for (x = 0; x < 4; x++)
val[x] = random();
snprintf(buf, size, "%08lx%08lx%08lx%08lx", val[0], val[1], val[2], val[3]);
*(buf+size) = '\0';
}

Thanks.

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Anthony Minessale

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