ipv6 #1 assignment done

pedro/ipv6-stuff/overlap.py

@@ -0,0 +1,53 @@
+import ipaddress
+import argparse
+# for exit codes
+import sys
+
+def proc_args():
+  # src https://docs.python.org/3/library/argparse.html#description
+  parser = argparse.ArgumentParser(description='Compare two IPs and check if they are overlapped or not')
+  parser.add_argument('ip1', type=str,
+                      help='IPv6 number 1')
+  parser.add_argument('ip2', type=str,
+                      help='IPv6 number 2')
+  args = parser.parse_args()
+  return args
+
+  #  - Write a python script that checks whether two IPv6 networks are overlapping
+  #    - *overlap.py ip1 ip2*
+
+def parse_ip(ip_arg):
+  if('/' in ip_arg):
+    ip_arg = ip_arg.split('/')[0]
+  else:
+    # if no network specified, assume a netmask of /48 for all of them
+    ip_arg = ip_arg + '/48'
+  # strict false to avoid -> https://stackoverflow.com/questions/40839147/ipaddress-module-valueerrors-has-host-bits-set-self
+  # strict is passed to IPv4Network or IPv6Network constructor. A ValueError is
+  #   raised if address does not represent a valid IPv4 or IPv6 address, or if
+  #   the network has host bits set. -> src https://docs.python.org/3/library/ipaddress.html#ipaddress.ip_network
+  return ipaddress.IPv6Network(ip_arg, False)
+
+def main():
+
+  is_overlap=False
+
+  args = proc_args()
+  try:
+    ip1 = parse_ip(args.ip1)
+    ip2 = parse_ip(args.ip2)
+  except:
+    print('incorrect IPv6 address')
+
+  # src https://docs.python.org/3/library/ipaddress.html#ipaddress.IPv4Network.overlaps
+  is_overlap = ip1.overlaps(ip2)
+
+  if(is_overlap):
+    print('overlap')
+    sys.exit(1)
+  else:
+    print('no overlap')
+    sys.exit(0)
+
+if __name__ == "__main__":
+    main()

pedro/ipv6-stuff/overlap_run.sh

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+#!/bin/sh
+
+run_program() {
+  echo "args:\n  ip1: ${1}\n  ip2: ${2}"
+  printf 'output: '
+  python3 overlap.py ${1} ${2}
+  echo "exit code: $?"
+  echo '----------------'
+}
+
+#  - Use the following test IPv6 addresses:
+#    - 2001:db8::
+#    - 2001:db8:0:2::
+#    - 2001:db8:1::
+#  - Step 2: Make your script parse ipv6 networks (like
+#    2001:db8::/48 and 2001:db8::/64) ) and check whether they overlap
+
+ip1='2001:db8::'
+ip2='2001:db8:0:2::'
+run_program $ip1 $ip2
+
+ip1='2001:db8::'
+ip2='2001:db8:1::'
+run_program $ip1 $ip2
+
+ip1='2001:db8:0:2::'
+ip2='2001:db8:1::'
+run_program $ip1 $ip2
+
+ip1='2001:db8::/48'
+ip2='2001:db8::/64'
+run_program $ip1 $ip2