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Use random address allocation for DHCPv6 temporary addresses.

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This commit is contained in:
Simon Kelley
2013-11-07 14:20:13 +00:00
parent 3511a92869
commit 6586e8352a
4 changed files with 44 additions and 13 deletions
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37
src/util.c
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@@ -39,6 +39,15 @@ unsigned short rand16(void)
return (unsigned short) (arc4random() >> 15);
}
u64 rand64(void)
{
u64 ret;
arc4random_buf(&ret, sizeof(ret));
return ret;
}
#else
/* SURF random number generator */
@@ -46,6 +55,7 @@ unsigned short rand16(void)
static u32 seed[32];
static u32 in[12];
static u32 out[8];
static int outleft = 0;
void rand_init()
{
@@ -82,16 +92,31 @@ static void surf(void)
}
unsigned short rand16(void)
{
if (!outleft)
{
if (!++in[0]) if (!++in[1]) if (!++in[2]) ++in[3];
surf();
outleft = 8;
}
return (unsigned short) out[--outleft];
}
u64 rand64(void)
{
static int outleft = 0;
if (!outleft) {
if (!++in[0]) if (!++in[1]) if (!++in[2]) ++in[3];
surf();
outleft = 8;
}
if (outleft < 2)
{
if (!++in[0]) if (!++in[1]) if (!++in[2]) ++in[3];
surf();
outleft = 8;
}
outleft -= 2;
return (unsigned short) out[--outleft];
return (u64)out[outleft+1] + (((u64)out[outleft]) << 32);
}
#endif