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"""Custom Jinja2 filters for IPv4 address math."""
import struct
import socket
def _ip_to_int(ip):
return struct.unpack("!I", socket.inet_aton(ip))[0]
def _int_to_ip(n):
return socket.inet_ntoa(struct.pack("!I", n))
def ipv4_network(cidr):
"""Return the network address of a CIDR. '10.0.20.2/24' -> '10.0.20.0'"""
ip, prefix = cidr.split("/")
mask = (0xFFFFFFFF << (32 - int(prefix))) & 0xFFFFFFFF
return _int_to_ip(_ip_to_int(ip) & mask)
def ipv4_nth(cidr, n):
"""Return the nth host address relative to the given IP. '192.168.2.0/16' | ipv4_nth(101) -> '192.168.2.101'"""
ip, _ = cidr.split("/")
return _int_to_ip(_ip_to_int(ip) + int(n))
def ipv4_nth_cidr(cidr, n):
"""Return the nth host address with the original prefix. '10.0.20.0/24' | ipv4_nth_cidr(101) -> '10.0.20.101/24'"""
_, prefix = cidr.split("/")
return ipv4_nth(cidr, n) + "/" + prefix
def ipv4_host(cidr):
"""Return just the host part of a CIDR. '10.0.20.2/24' -> '10.0.20.2'"""
return cidr.split("/")[0]
def ipv4_prefixlen(cidr):
"""Return just the prefix length. '10.0.20.2/24' -> '24'"""
return cidr.split("/")[1]
def normalize_zfs(entries):
"""Expand short ZFS dataset names to full zroot/jails/volumes/ paths."""
result = []
for entry in entries:
e = dict(entry)
if '/' not in e.get('name', ''):
e['name'] = 'zroot/jails/volumes/' + e['name']
result.append(e)
return result
def normalize_nullfs(entries):
"""Expand short nullfs src names to full /usr/local/jails/volumes/ paths."""
result = []
for entry in entries:
e = dict(entry)
src = e.get('src', '')
if not src.startswith('/'):
e['src'] = '/usr/local/jails/volumes/' + src
result.append(e)
return result
class FilterModule(object):
def filters(self):
return {
"ipv4_network": ipv4_network,
"ipv4_nth": ipv4_nth,
"ipv4_nth_cidr": ipv4_nth_cidr,
"ipv4_host": ipv4_host,
"ipv4_prefixlen": ipv4_prefixlen,
"normalize_zfs": normalize_zfs,
"normalize_nullfs": normalize_nullfs,
}
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