From 0e5b2871ca6456b01d4bf037a6e68badf1ff1a41 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Henryk=20Pl=C3=B6tz?= <henryk@ploetzli.ch>
Date: Fri, 3 Oct 2014 19:58:52 +0200
Subject: Initial commit of djbdns-1.05.tar.gz Source was
 http://cr.yp.to/djbdns/djbdns-1.05.tar.gz, SHA1
 2efdb3a039d0c548f40936aa9cb30829e0ce8c3d

---
 random-ip.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 random-ip.c

(limited to 'random-ip.c')

diff --git a/random-ip.c b/random-ip.c
new file mode 100644
index 0000000..bfd516c
--- /dev/null
+++ b/random-ip.c
@@ -0,0 +1,80 @@
+#include "buffer.h"
+#include "exit.h"
+#include "fmt.h"
+#include "scan.h"
+#include "dns.h"
+
+char ip[4];
+int ipfixed = 0;
+unsigned long loops = 10000;
+unsigned char tab[256];
+
+char strnum[FMT_ULONG];
+
+char seed[128];
+
+int main(int argc,char **argv)
+{
+  unsigned long u;
+  int i;
+  int j;
+  unsigned char c;
+
+  dns_random_init(seed);
+
+  for (i = 0;i < 256;++i) tab[i] = i;
+  for (j = 256;j > 0;--j) {
+    i = dns_random(j);
+    c = tab[j - 1];
+    tab[j - 1] = tab[i];
+    tab[i] = c;
+  }
+
+  if (*argv) ++argv;
+  if (*argv) scan_ulong(*argv++,&loops);
+  if (*argv) { scan_ulong(*argv++,&u); ip[0] = u; ipfixed = 1; }
+  if (*argv) { scan_ulong(*argv++,&u); ip[1] = u; ipfixed = 2; }
+  if (*argv) { scan_ulong(*argv++,&u); ip[2] = u; ipfixed = 3; }
+  if (*argv) { scan_ulong(*argv++,&u); ip[3] = u; ipfixed = 4; }
+
+  if (ipfixed >= 1) if (loops > 16777216) loops = 16777216;
+  if (ipfixed >= 2) if (loops > 65536) loops = 65536;
+  if (ipfixed >= 3) if (loops > 256) loops = 256;
+  if (ipfixed >= 4) if (loops > 1) loops = 1;
+
+  while (loops) {
+    --loops;
+    u = loops;
+    for (i = ipfixed;i < 4;++i) { ip[i] = u & 255; u >>= 8; }
+    if (ipfixed == 3) {
+      c = ip[3];
+      ip[3] = tab[c];
+    }
+    else if (ipfixed < 3) {
+      c = 0;
+      for (j = 0;j < 100;++j) {
+        for (i = ipfixed;i < 4;++i) {
+          c ^= (unsigned char) ip[i];
+          c = tab[c];
+          ip[i] = c;
+        }
+      }
+    }
+
+    u = (unsigned char) ip[0];
+    buffer_put(buffer_1,strnum,fmt_ulong(strnum,u));
+    buffer_puts(buffer_1,".");
+    u = (unsigned char) ip[1];
+    buffer_put(buffer_1,strnum,fmt_ulong(strnum,u));
+    buffer_puts(buffer_1,".");
+    u = (unsigned char) ip[2];
+    buffer_put(buffer_1,strnum,fmt_ulong(strnum,u));
+    buffer_puts(buffer_1,".");
+    u = (unsigned char) ip[3];
+    buffer_put(buffer_1,strnum,fmt_ulong(strnum,u));
+    buffer_puts(buffer_1,"\n");
+  }
+
+  buffer_flush(buffer_1);
+  _exit(0);
+}
-- 
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