Utility to create pnSeed array

contrib/seeds/README

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+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).

contrib/seeds/makeseeds.py

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+#!/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()