From 9126e08739f5115c3032997cabd23f27037131ef Mon Sep 17 00:00:00 2001
From: Gavin Andresen <gavinandresen@gmail.com>
Date: Tue, 29 Jan 2013 22:17:56 -0500
Subject: [PATCH] Utility to create pnSeed array

---
 contrib/seeds/README       |  9 +++++++++
 contrib/seeds/makeseeds.py | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 contrib/seeds/README
 create mode 100755 contrib/seeds/makeseeds.py

diff --git a/contrib/seeds/README b/contrib/seeds/README
new file mode 100644
index 00000000..97e3e1ec
--- /dev/null
+++ b/contrib/seeds/README
@@ -0,0 +1,9 @@
+Utility to generate the pnSeed[] array that is compiled into the client
+(see src/net.cpp).
+
+The 600 seeds compiled into the 0.8 release were created from sipa's DNS seed data, like this:
+
+curl -s http://bitcoin.sipa.be/seeds.txt | head -1000 | makeseeds.py
+
+The input to makeseeds.py is assumed to be approximately sorted from most-reliable to least-reliable,
+with IP:port first on each line (lines that don't match IPv4:port are ignored).
diff --git a/contrib/seeds/makeseeds.py b/contrib/seeds/makeseeds.py
new file mode 100755
index 00000000..1d01fd7d
--- /dev/null
+++ b/contrib/seeds/makeseeds.py
@@ -0,0 +1,32 @@
+#!/usr/bin/env python
+#
+# Generate pnSeed[] from Pieter's DNS seeder
+#
+
+NSEEDS=600
+
+import re
+import sys
+from subprocess import check_output
+
+def main():
+    lines = sys.stdin.readlines()
+
+    ips = []
+    pattern = re.compile(r"^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3}):8333")
+    for line in lines:
+        m = pattern.match(line)
+        if m is None:
+            continue
+        ip = 0
+        for i in range(0,4):
+            ip = ip + (int(m.group(i+1)) << (8*(i)))
+        if ip == 0:
+            continue
+        ips.append(ip)
+
+    for row in range(0, min(NSEEDS,len(ips)), 8):
+        print "    " + ", ".join([ "0x%08x"%i for i in ips[row:row+8] ]) + ","
+
+if __name__ == '__main__':
+    main()