+###--------------------------------------------------------------------------
+### Address manipulation.
+###
+### I think this is the most demanding application, in terms of address
+### hacking, in the entire TrIPE suite. At least we don't have to do it in
+### C.
+
+class BaseAddress (object):
+ def __init__(me, addrstr, maskstr = None):
+ me._setaddr(addrstr)
+ if maskstr is None:
+ me.mask = -1
+ elif maskstr.isdigit():
+ me.mask = (1 << me.NBITS) - (1 << me.NBITS - int(maskstr))
+ else:
+ me._setmask(maskstr)
+ if me.addr&~me.mask:
+ raise ValueError('network contains bits set beyond mask')
+ def _addrstr_to_int(me, addrstr):
+ try: return loadb(S.inet_pton(me.AF, addrstr))
+ except S.error: raise ValueError('bad address syntax')
+ def _int_to_addrstr(me, n):
+ return S.inet_ntop(me.AF, storeb(me.addr, me.NBITS))
+ def _setmask(me, maskstr):
+ raise ValueError('only prefix masked supported')
+ def _maskstr(me):
+ raise ValueError('only prefix masked supported')
+ def sockaddr(me, port = 0):
+ if me.mask != -1: raise ValueError('not a simple address')
+ return me._sockaddr(port)
+ def __str__(me):
+ addrstr = me._addrstr()
+ if me.mask == -1:
+ return addrstr
+ else:
+ inv = me.mask ^ ((1 << me.NBITS) - 1)
+ if (inv&(inv + 1)) == 0:
+ return '%s/%d' % (addrstr, me.NBITS - inv.bit_length())
+ else:
+ return '%s/%s' % (addrstr, me._maskstr())
+ def withinp(me, net):
+ if type(net) != type(me): return False
+ if (me.mask&net.mask) != net.mask: return False
+ if (me.addr ^ net.addr)&net.mask: return False
+ return me._withinp(net)
+ def eq(me, other):
+ if type(me) != type(other): return False
+ if me.mask != other.mask: return False
+ if me.addr != other.addr: return False
+ return me._eq(other)
+ def _withinp(me, net):
+ return True
+ def _eq(me, other):
+ return True
+
+class InetAddress (BaseAddress):
+ AF = S.AF_INET
+ AFNAME = 'IPv4'
+ NBITS = 32
+ def _addrstr_to_int(me, addrstr):
+ try: return loadb(S.inet_aton(addrstr))
+ except S.error: raise ValueError('bad address syntax')
+ def _setaddr(me, addrstr):
+ me.addr = me._addrstr_to_int(addrstr)
+ def _setmask(me, maskstr):
+ me.mask = me._addrstr_to_int(maskstr)
+ def _addrstr(me):
+ return me._int_to_addrstr(me.addr)
+ def _maskstr(me):
+ return me._int_to_addrstr(me.mask)
+ def _sockaddr(me, port = 0):
+ return (me._addrstr(), port)
+ @classmethod
+ def from_sockaddr(cls, sa):
+ addr, port = (lambda a, p: (a, p))(*sa)
+ return cls(addr), port
+
+class Inet6Address (BaseAddress):
+ AF = S.AF_INET6
+ AFNAME = 'IPv6'
+ NBITS = 128
+ def _setaddr(me, addrstr):
+ pc = addrstr.find('%')
+ if pc == -1:
+ me.addr = me._addrstr_to_int(addrstr)
+ me.scope = 0
+ else:
+ me.addr = me._addrstr_to_int(addrstr[:pc])
+ ais = S.getaddrinfo(addrstr, 0, S.AF_INET6, S.SOCK_DGRAM, 0,
+ S.AI_NUMERICHOST | S.AI_NUMERICSERV)
+ me.scope = ais[0][4][3]
+ def _addrstr(me):
+ addrstr = me._int_to_addrstr(me.addr)
+ if me.scope == 0:
+ return addrstr
+ else:
+ name, _ = S.getnameinfo((addrstr, 0, 0, me.scope),
+ S.NI_NUMERICHOST | S.NI_NUMERICSERV)
+ return name
+ def _sockaddr(me, port = 0):
+ return (me._addrstr(), port, 0, me.scope)
+ @classmethod
+ def from_sockaddr(cls, sa):
+ addr, port, _, scope = (lambda a, p, f = 0, s = 0: (a, p, f, s))(*sa)
+ me = cls(addr)
+ me.scope = scope
+ return me, port
+ def _withinp(me, net):
+ return net.scope == 0 or me.scope == net.scope
+ def _eq(me, other):
+ return me.scope == other.scope
+
+def parse_address(addrstr, maskstr = None):
+ if addrstr.find(':') >= 0: return Inet6Address(addrstr, maskstr)
+ else: return InetAddress(addrstr, maskstr)
+
+def parse_net(netstr):
+ try: sl = netstr.index('/')
+ except ValueError: raise ValueError('missing mask')
+ return parse_address(netstr[:sl], netstr[sl + 1:])
+
+def straddr(a): return a is None and '#<none>' or str(a)