summaryrefslogtreecommitdiff
path: root/dnsstub/dns_random.c
diff options
context:
space:
mode:
Diffstat (limited to 'dnsstub/dns_random.c')
-rw-r--r--dnsstub/dns_random.c70
1 files changed, 0 insertions, 70 deletions
diff --git a/dnsstub/dns_random.c b/dnsstub/dns_random.c
deleted file mode 100644
index 200cd6c..0000000
--- a/dnsstub/dns_random.c
+++ /dev/null
@@ -1,70 +0,0 @@
-#include <unistd.h>
-#include "taia.h"
-#include "uint_t.h"
-#include "dnsresolv.h"
-
-/**
- @file dns_random.c
- @author djb
- @source ucspi-tcp
- @brief random use of DNS resolvers given their IP
-*/
-
-static uint32 seed[32];
-static uint32 in[12];
-static uint32 out[8];
-static int outleft = 0;
-
-#define ROTATE(x,b) (((x) << (b)) | ((x) >> (32 - (b))))
-#define MUSH(i,b) x = t[i] += (((x ^ seed[i]) + sum) ^ ROTATE(x,b));
-
-static void surf(void)
-{
- uint32 t[12]; uint32 x; uint32 sum = 0;
- int r; int i; int loop;
-
- for (i = 0; i < 12; ++i) t[i] = in[i] ^ seed[12 + i];
- for (i = 0; i < 8; ++i) out[i] = seed[24 + i];
- x = t[11];
- for (loop = 0; loop < 2; ++loop) {
- for (r = 0; r < 16; ++r) {
- sum += 0x9e3779b9;
- MUSH(0,5) MUSH(1,7) MUSH(2,9) MUSH(3,13)
- MUSH(4,5) MUSH(5,7) MUSH(6,9) MUSH(7,13)
- MUSH(8,5) MUSH(9,7) MUSH(10,9) MUSH(11,13)
- }
- for (i = 0; i < 8; ++i) out[i] ^= t[i + 4];
- }
-}
-
-void dns_random_init(const char data[128])
-{
- int i;
- struct taia t;
- char tpack[16];
-
- for (i = 0; i < 32; ++i)
- uint32_unpack((char *)data + 4 * i,seed + i);
-
- taia_now(&t);
- taia_pack(tpack,&t);
- for (i = 0; i < 4; ++i)
- uint32_unpack(tpack + 4 * i,in + 4 + i);
-
- in[8] = getpid();
- in[9] = getppid();
- /* more space in 10 and 11, but this is probably enough */
-}
-
-unsigned int dns_random(unsigned int n)
-{
- if (!n) return 0;
-
- if (!outleft) {
- if (!++in[0]) if (!++in[1]) if (!++in[2]) ++in[3];
- surf();
- outleft = 8;
- }
-
- return out[--outleft] % n;
-}