Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1 | # Copyright 2007 Google Inc. |
| 2 | # Licensed to PSF under a Contributor Agreement. |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 3 | |
| 4 | """A fast, lightweight IPv4/IPv6 manipulation library in Python. |
| 5 | |
| 6 | This library is used to create/poke/manipulate IPv4 and IPv6 addresses |
| 7 | and networks. |
| 8 | |
| 9 | """ |
| 10 | |
| 11 | __version__ = '1.0' |
| 12 | |
Hynek Schlawack | 91c5a34 | 2012-06-05 11:55:58 +0200 | [diff] [blame] | 13 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 14 | import struct |
Nick Coghlan | 3008ec0 | 2012-07-08 00:45:33 +1000 | [diff] [blame] | 15 | import functools |
Hynek Schlawack | 91c5a34 | 2012-06-05 11:55:58 +0200 | [diff] [blame] | 16 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 17 | IPV4LENGTH = 32 |
| 18 | IPV6LENGTH = 128 |
| 19 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 20 | class AddressValueError(ValueError): |
| 21 | """A Value Error related to the address.""" |
| 22 | |
| 23 | |
| 24 | class NetmaskValueError(ValueError): |
| 25 | """A Value Error related to the netmask.""" |
| 26 | |
| 27 | |
Nick Coghlan | 51c3067 | 2012-05-27 00:25:58 +1000 | [diff] [blame] | 28 | def ip_address(address): |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 29 | """Take an IP string/int and return an object of the correct type. |
| 30 | |
| 31 | Args: |
| 32 | address: A string or integer, the IP address. Either IPv4 or |
| 33 | IPv6 addresses may be supplied; integers less than 2**32 will |
| 34 | be considered to be IPv4 by default. |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 35 | |
| 36 | Returns: |
| 37 | An IPv4Address or IPv6Address object. |
| 38 | |
| 39 | Raises: |
Sandro Tosi | 876ecad | 2012-05-23 22:26:55 +0200 | [diff] [blame] | 40 | ValueError: if the *address* passed isn't either a v4 or a v6 |
Nick Coghlan | 51c3067 | 2012-05-27 00:25:58 +1000 | [diff] [blame] | 41 | address |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 42 | |
| 43 | """ |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 44 | try: |
| 45 | return IPv4Address(address) |
| 46 | except (AddressValueError, NetmaskValueError): |
| 47 | pass |
| 48 | |
| 49 | try: |
| 50 | return IPv6Address(address) |
| 51 | except (AddressValueError, NetmaskValueError): |
| 52 | pass |
| 53 | |
| 54 | raise ValueError('%r does not appear to be an IPv4 or IPv6 address' % |
| 55 | address) |
| 56 | |
| 57 | |
Nick Coghlan | 51c3067 | 2012-05-27 00:25:58 +1000 | [diff] [blame] | 58 | def ip_network(address, strict=True): |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 59 | """Take an IP string/int and return an object of the correct type. |
| 60 | |
| 61 | Args: |
| 62 | address: A string or integer, the IP network. Either IPv4 or |
| 63 | IPv6 networks may be supplied; integers less than 2**32 will |
| 64 | be considered to be IPv4 by default. |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 65 | |
| 66 | Returns: |
| 67 | An IPv4Network or IPv6Network object. |
| 68 | |
| 69 | Raises: |
| 70 | ValueError: if the string passed isn't either a v4 or a v6 |
Nick Coghlan | 51c3067 | 2012-05-27 00:25:58 +1000 | [diff] [blame] | 71 | address. Or if the network has host bits set. |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 72 | |
| 73 | """ |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 74 | try: |
| 75 | return IPv4Network(address, strict) |
| 76 | except (AddressValueError, NetmaskValueError): |
| 77 | pass |
| 78 | |
| 79 | try: |
| 80 | return IPv6Network(address, strict) |
| 81 | except (AddressValueError, NetmaskValueError): |
| 82 | pass |
| 83 | |
| 84 | raise ValueError('%r does not appear to be an IPv4 or IPv6 network' % |
| 85 | address) |
| 86 | |
| 87 | |
Nick Coghlan | 51c3067 | 2012-05-27 00:25:58 +1000 | [diff] [blame] | 88 | def ip_interface(address): |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 89 | """Take an IP string/int and return an object of the correct type. |
| 90 | |
| 91 | Args: |
| 92 | address: A string or integer, the IP address. Either IPv4 or |
| 93 | IPv6 addresses may be supplied; integers less than 2**32 will |
| 94 | be considered to be IPv4 by default. |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 95 | |
| 96 | Returns: |
Sandro Tosi | 876ecad | 2012-05-23 22:26:55 +0200 | [diff] [blame] | 97 | An IPv4Interface or IPv6Interface object. |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 98 | |
| 99 | Raises: |
| 100 | ValueError: if the string passed isn't either a v4 or a v6 |
Nick Coghlan | 51c3067 | 2012-05-27 00:25:58 +1000 | [diff] [blame] | 101 | address. |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 102 | |
| 103 | Notes: |
| 104 | The IPv?Interface classes describe an Address on a particular |
| 105 | Network, so they're basically a combination of both the Address |
| 106 | and Network classes. |
Sandro Tosi | b95c634 | 2012-05-23 23:17:22 +0200 | [diff] [blame] | 107 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 108 | """ |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 109 | try: |
| 110 | return IPv4Interface(address) |
| 111 | except (AddressValueError, NetmaskValueError): |
| 112 | pass |
| 113 | |
| 114 | try: |
| 115 | return IPv6Interface(address) |
| 116 | except (AddressValueError, NetmaskValueError): |
| 117 | pass |
| 118 | |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 119 | raise ValueError('%r does not appear to be an IPv4 or IPv6 interface' % |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 120 | address) |
| 121 | |
| 122 | |
| 123 | def v4_int_to_packed(address): |
Sandro Tosi | 876ecad | 2012-05-23 22:26:55 +0200 | [diff] [blame] | 124 | """Represent an address as 4 packed bytes in network (big-endian) order. |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 125 | |
| 126 | Args: |
| 127 | address: An integer representation of an IPv4 IP address. |
| 128 | |
| 129 | Returns: |
Sandro Tosi | 876ecad | 2012-05-23 22:26:55 +0200 | [diff] [blame] | 130 | The integer address packed as 4 bytes in network (big-endian) order. |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 131 | |
| 132 | Raises: |
Sandro Tosi | 876ecad | 2012-05-23 22:26:55 +0200 | [diff] [blame] | 133 | ValueError: If the integer is negative or too large to be an |
| 134 | IPv4 IP address. |
Sandro Tosi | b95c634 | 2012-05-23 23:17:22 +0200 | [diff] [blame] | 135 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 136 | """ |
Sandro Tosi | 876ecad | 2012-05-23 22:26:55 +0200 | [diff] [blame] | 137 | try: |
| 138 | return struct.pack('!I', address) |
| 139 | except: |
| 140 | raise ValueError("Address negative or too large for IPv4") |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 141 | |
| 142 | |
| 143 | def v6_int_to_packed(address): |
Sandro Tosi | 876ecad | 2012-05-23 22:26:55 +0200 | [diff] [blame] | 144 | """Represent an address as 16 packed bytes in network (big-endian) order. |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 145 | |
| 146 | Args: |
Sandro Tosi | b4386d3 | 2012-06-02 17:14:22 +0200 | [diff] [blame] | 147 | address: An integer representation of an IPv6 IP address. |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 148 | |
| 149 | Returns: |
Sandro Tosi | 876ecad | 2012-05-23 22:26:55 +0200 | [diff] [blame] | 150 | The integer address packed as 16 bytes in network (big-endian) order. |
Sandro Tosi | b95c634 | 2012-05-23 23:17:22 +0200 | [diff] [blame] | 151 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 152 | """ |
Sandro Tosi | 876ecad | 2012-05-23 22:26:55 +0200 | [diff] [blame] | 153 | try: |
| 154 | return struct.pack('!QQ', address >> 64, address & (2**64 - 1)) |
| 155 | except: |
| 156 | raise ValueError("Address negative or too large for IPv6") |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 157 | |
| 158 | |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 159 | def _split_optional_netmask(address): |
| 160 | """Helper to split the netmask and raise AddressValueError if needed""" |
| 161 | addr = str(address).split('/') |
| 162 | if len(addr) > 2: |
| 163 | raise AddressValueError("Only one '/' permitted in %r" % address) |
| 164 | return addr |
| 165 | |
Nick Coghlan | 297b143 | 2012-07-08 17:11:04 +1000 | [diff] [blame] | 166 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 167 | def _find_address_range(addresses): |
Sandro Tosi | 876ecad | 2012-05-23 22:26:55 +0200 | [diff] [blame] | 168 | """Find a sequence of IPv#Address. |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 169 | |
| 170 | Args: |
Sandro Tosi | 876ecad | 2012-05-23 22:26:55 +0200 | [diff] [blame] | 171 | addresses: a list of IPv#Address objects. |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 172 | |
| 173 | Returns: |
| 174 | A tuple containing the first and last IP addresses in the sequence. |
| 175 | |
| 176 | """ |
| 177 | first = last = addresses[0] |
| 178 | for ip in addresses[1:]: |
| 179 | if ip._ip == last._ip + 1: |
| 180 | last = ip |
| 181 | else: |
| 182 | break |
| 183 | return (first, last) |
| 184 | |
Sandro Tosi | b95c634 | 2012-05-23 23:17:22 +0200 | [diff] [blame] | 185 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 186 | def _count_righthand_zero_bits(number, bits): |
| 187 | """Count the number of zero bits on the right hand side. |
| 188 | |
| 189 | Args: |
| 190 | number: an integer. |
| 191 | bits: maximum number of bits to count. |
| 192 | |
| 193 | Returns: |
| 194 | The number of zero bits on the right hand side of the number. |
| 195 | |
| 196 | """ |
| 197 | if number == 0: |
| 198 | return bits |
| 199 | for i in range(bits): |
Nick Coghlan | 7319f69 | 2012-07-07 21:43:30 +1000 | [diff] [blame] | 200 | if (number >> i) & 1: |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 201 | return i |
Nick Coghlan | 7319f69 | 2012-07-07 21:43:30 +1000 | [diff] [blame] | 202 | # All bits of interest were zero, even if there are more in the number |
| 203 | return bits |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 204 | |
| 205 | |
| 206 | def summarize_address_range(first, last): |
| 207 | """Summarize a network range given the first and last IP addresses. |
| 208 | |
| 209 | Example: |
| 210 | >>> summarize_address_range(IPv4Address('192.0.2.0'), |
| 211 | IPv4Address('192.0.2.130')) |
| 212 | [IPv4Network('192.0.2.0/25'), IPv4Network('192.0.2.128/31'), |
| 213 | IPv4Network('192.0.2.130/32')] |
| 214 | |
| 215 | Args: |
| 216 | first: the first IPv4Address or IPv6Address in the range. |
| 217 | last: the last IPv4Address or IPv6Address in the range. |
| 218 | |
| 219 | Returns: |
| 220 | An iterator of the summarized IPv(4|6) network objects. |
| 221 | |
| 222 | Raise: |
| 223 | TypeError: |
| 224 | If the first and last objects are not IP addresses. |
| 225 | If the first and last objects are not the same version. |
| 226 | ValueError: |
| 227 | If the last object is not greater than the first. |
Nick Coghlan | 51c3067 | 2012-05-27 00:25:58 +1000 | [diff] [blame] | 228 | If the version of the first address is not 4 or 6. |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 229 | |
| 230 | """ |
Hynek Schlawack | 072b1e1 | 2012-05-26 12:04:56 +0200 | [diff] [blame] | 231 | if (not (isinstance(first, _BaseAddress) and |
| 232 | isinstance(last, _BaseAddress))): |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 233 | raise TypeError('first and last must be IP addresses, not networks') |
| 234 | if first.version != last.version: |
| 235 | raise TypeError("%s and %s are not of the same version" % ( |
Nick Coghlan | 912238e | 2012-07-07 13:34:50 +1000 | [diff] [blame] | 236 | first, last)) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 237 | if first > last: |
| 238 | raise ValueError('last IP address must be greater than first') |
| 239 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 240 | if first.version == 4: |
| 241 | ip = IPv4Network |
| 242 | elif first.version == 6: |
| 243 | ip = IPv6Network |
| 244 | else: |
| 245 | raise ValueError('unknown IP version') |
| 246 | |
| 247 | ip_bits = first._max_prefixlen |
| 248 | first_int = first._ip |
| 249 | last_int = last._ip |
| 250 | while first_int <= last_int: |
Nick Coghlan | 7319f69 | 2012-07-07 21:43:30 +1000 | [diff] [blame] | 251 | nbits = min(_count_righthand_zero_bits(first_int, ip_bits), |
| 252 | (last_int - first_int + 1).bit_length() - 1) |
| 253 | net = ip('%s/%d' % (first, ip_bits - nbits)) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 254 | yield net |
Nick Coghlan | 7319f69 | 2012-07-07 21:43:30 +1000 | [diff] [blame] | 255 | first_int += 1 << nbits |
| 256 | if first_int - 1 == ip._ALL_ONES: |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 257 | break |
Nick Coghlan | 51c3067 | 2012-05-27 00:25:58 +1000 | [diff] [blame] | 258 | first = first.__class__(first_int) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 259 | |
Sandro Tosi | b95c634 | 2012-05-23 23:17:22 +0200 | [diff] [blame] | 260 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 261 | def _collapse_addresses_recursive(addresses): |
| 262 | """Loops through the addresses, collapsing concurrent netblocks. |
| 263 | |
| 264 | Example: |
| 265 | |
| 266 | ip1 = IPv4Network('192.0.2.0/26') |
| 267 | ip2 = IPv4Network('192.0.2.64/26') |
| 268 | ip3 = IPv4Network('192.0.2.128/26') |
| 269 | ip4 = IPv4Network('192.0.2.192/26') |
| 270 | |
| 271 | _collapse_addresses_recursive([ip1, ip2, ip3, ip4]) -> |
| 272 | [IPv4Network('192.0.2.0/24')] |
| 273 | |
| 274 | This shouldn't be called directly; it is called via |
| 275 | collapse_addresses([]). |
| 276 | |
| 277 | Args: |
| 278 | addresses: A list of IPv4Network's or IPv6Network's |
| 279 | |
| 280 | Returns: |
| 281 | A list of IPv4Network's or IPv6Network's depending on what we were |
| 282 | passed. |
| 283 | |
| 284 | """ |
Nick Coghlan | 7319f69 | 2012-07-07 21:43:30 +1000 | [diff] [blame] | 285 | while True: |
| 286 | last_addr = None |
| 287 | ret_array = [] |
| 288 | optimized = False |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 289 | |
Nick Coghlan | 7319f69 | 2012-07-07 21:43:30 +1000 | [diff] [blame] | 290 | for cur_addr in addresses: |
| 291 | if not ret_array: |
| 292 | last_addr = cur_addr |
| 293 | ret_array.append(cur_addr) |
| 294 | elif (cur_addr.network_address >= last_addr.network_address and |
| 295 | cur_addr.broadcast_address <= last_addr.broadcast_address): |
| 296 | optimized = True |
| 297 | elif cur_addr == list(last_addr.supernet().subnets())[1]: |
| 298 | ret_array[-1] = last_addr = last_addr.supernet() |
| 299 | optimized = True |
| 300 | else: |
| 301 | last_addr = cur_addr |
| 302 | ret_array.append(cur_addr) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 303 | |
Nick Coghlan | 7319f69 | 2012-07-07 21:43:30 +1000 | [diff] [blame] | 304 | addresses = ret_array |
| 305 | if not optimized: |
| 306 | return addresses |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 307 | |
| 308 | |
| 309 | def collapse_addresses(addresses): |
| 310 | """Collapse a list of IP objects. |
| 311 | |
| 312 | Example: |
| 313 | collapse_addresses([IPv4Network('192.0.2.0/25'), |
| 314 | IPv4Network('192.0.2.128/25')]) -> |
| 315 | [IPv4Network('192.0.2.0/24')] |
| 316 | |
| 317 | Args: |
| 318 | addresses: An iterator of IPv4Network or IPv6Network objects. |
| 319 | |
| 320 | Returns: |
| 321 | An iterator of the collapsed IPv(4|6)Network objects. |
| 322 | |
| 323 | Raises: |
| 324 | TypeError: If passed a list of mixed version objects. |
| 325 | |
| 326 | """ |
| 327 | i = 0 |
| 328 | addrs = [] |
| 329 | ips = [] |
| 330 | nets = [] |
| 331 | |
| 332 | # split IP addresses and networks |
| 333 | for ip in addresses: |
| 334 | if isinstance(ip, _BaseAddress): |
| 335 | if ips and ips[-1]._version != ip._version: |
| 336 | raise TypeError("%s and %s are not of the same version" % ( |
Nick Coghlan | 912238e | 2012-07-07 13:34:50 +1000 | [diff] [blame] | 337 | ip, ips[-1])) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 338 | ips.append(ip) |
| 339 | elif ip._prefixlen == ip._max_prefixlen: |
| 340 | if ips and ips[-1]._version != ip._version: |
| 341 | raise TypeError("%s and %s are not of the same version" % ( |
Nick Coghlan | 912238e | 2012-07-07 13:34:50 +1000 | [diff] [blame] | 342 | ip, ips[-1])) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 343 | try: |
| 344 | ips.append(ip.ip) |
| 345 | except AttributeError: |
| 346 | ips.append(ip.network_address) |
| 347 | else: |
| 348 | if nets and nets[-1]._version != ip._version: |
| 349 | raise TypeError("%s and %s are not of the same version" % ( |
Nick Coghlan | 912238e | 2012-07-07 13:34:50 +1000 | [diff] [blame] | 350 | ip, nets[-1])) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 351 | nets.append(ip) |
| 352 | |
| 353 | # sort and dedup |
| 354 | ips = sorted(set(ips)) |
| 355 | nets = sorted(set(nets)) |
| 356 | |
| 357 | while i < len(ips): |
| 358 | (first, last) = _find_address_range(ips[i:]) |
| 359 | i = ips.index(last) + 1 |
| 360 | addrs.extend(summarize_address_range(first, last)) |
| 361 | |
| 362 | return iter(_collapse_addresses_recursive(sorted( |
| 363 | addrs + nets, key=_BaseNetwork._get_networks_key))) |
| 364 | |
| 365 | |
| 366 | def get_mixed_type_key(obj): |
| 367 | """Return a key suitable for sorting between networks and addresses. |
| 368 | |
| 369 | Address and Network objects are not sortable by default; they're |
| 370 | fundamentally different so the expression |
| 371 | |
| 372 | IPv4Address('192.0.2.0') <= IPv4Network('192.0.2.0/24') |
| 373 | |
| 374 | doesn't make any sense. There are some times however, where you may wish |
| 375 | to have ipaddress sort these for you anyway. If you need to do this, you |
| 376 | can use this function as the key= argument to sorted(). |
| 377 | |
| 378 | Args: |
| 379 | obj: either a Network or Address object. |
| 380 | Returns: |
| 381 | appropriate key. |
| 382 | |
| 383 | """ |
| 384 | if isinstance(obj, _BaseNetwork): |
| 385 | return obj._get_networks_key() |
| 386 | elif isinstance(obj, _BaseAddress): |
| 387 | return obj._get_address_key() |
| 388 | return NotImplemented |
| 389 | |
| 390 | |
Nick Coghlan | 3008ec0 | 2012-07-08 00:45:33 +1000 | [diff] [blame] | 391 | class _TotalOrderingMixin: |
| 392 | # Helper that derives the other comparison operations from |
| 393 | # __lt__ and __eq__ |
Nick Coghlan | 297b143 | 2012-07-08 17:11:04 +1000 | [diff] [blame] | 394 | # We avoid functools.total_ordering because it doesn't handle |
| 395 | # NotImplemented correctly yet (http://bugs.python.org/issue10042) |
Nick Coghlan | 3008ec0 | 2012-07-08 00:45:33 +1000 | [diff] [blame] | 396 | def __eq__(self, other): |
| 397 | raise NotImplementedError |
| 398 | def __ne__(self, other): |
| 399 | equal = self.__eq__(other) |
| 400 | if equal is NotImplemented: |
| 401 | return NotImplemented |
| 402 | return not equal |
| 403 | def __lt__(self, other): |
| 404 | raise NotImplementedError |
| 405 | def __le__(self, other): |
| 406 | less = self.__lt__(other) |
| 407 | if less is NotImplemented or not less: |
| 408 | return self.__eq__(other) |
| 409 | return less |
| 410 | def __gt__(self, other): |
| 411 | less = self.__lt__(other) |
| 412 | if less is NotImplemented: |
| 413 | return NotImplemented |
| 414 | equal = self.__eq__(other) |
| 415 | if equal is NotImplemented: |
| 416 | return NotImplemented |
| 417 | return not (less or equal) |
| 418 | def __ge__(self, other): |
| 419 | less = self.__lt__(other) |
| 420 | if less is NotImplemented: |
| 421 | return NotImplemented |
| 422 | return not less |
| 423 | |
| 424 | class _IPAddressBase(_TotalOrderingMixin): |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 425 | |
| 426 | """The mother class.""" |
| 427 | |
| 428 | @property |
| 429 | def exploded(self): |
| 430 | """Return the longhand version of the IP address as a string.""" |
| 431 | return self._explode_shorthand_ip_string() |
| 432 | |
| 433 | @property |
| 434 | def compressed(self): |
| 435 | """Return the shorthand version of the IP address as a string.""" |
| 436 | return str(self) |
| 437 | |
Nick Coghlan | d972265 | 2012-06-17 16:33:00 +1000 | [diff] [blame] | 438 | @property |
| 439 | def version(self): |
| 440 | msg = '%200s has no version specified' % (type(self),) |
| 441 | raise NotImplementedError(msg) |
| 442 | |
Nick Coghlan | 297b143 | 2012-07-08 17:11:04 +1000 | [diff] [blame] | 443 | def _check_int_address(self, address): |
| 444 | if address < 0: |
| 445 | msg = "%d (< 0) is not permitted as an IPv%d address" |
| 446 | raise AddressValueError(msg % (address, self._version)) |
| 447 | if address > self._ALL_ONES: |
| 448 | msg = "%d (>= 2**%d) is not permitted as an IPv%d address" |
| 449 | raise AddressValueError(msg % (address, self._max_prefixlen, |
| 450 | self._version)) |
| 451 | |
| 452 | def _check_packed_address(self, address, expected_len): |
| 453 | address_len = len(address) |
| 454 | if address_len != expected_len: |
| 455 | msg = "%r (len %d != %d) is not permitted as an IPv%d address" |
| 456 | raise AddressValueError(msg % (address, address_len, |
| 457 | expected_len, self._version)) |
| 458 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 459 | def _ip_int_from_prefix(self, prefixlen=None): |
| 460 | """Turn the prefix length netmask into a int for comparison. |
| 461 | |
| 462 | Args: |
| 463 | prefixlen: An integer, the prefix length. |
| 464 | |
| 465 | Returns: |
| 466 | An integer. |
| 467 | |
| 468 | """ |
Hynek Schlawack | 91c5a34 | 2012-06-05 11:55:58 +0200 | [diff] [blame] | 469 | if prefixlen is None: |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 470 | prefixlen = self._prefixlen |
| 471 | return self._ALL_ONES ^ (self._ALL_ONES >> prefixlen) |
| 472 | |
| 473 | def _prefix_from_ip_int(self, ip_int, mask=32): |
| 474 | """Return prefix length from the decimal netmask. |
| 475 | |
| 476 | Args: |
| 477 | ip_int: An integer, the IP address. |
| 478 | mask: The netmask. Defaults to 32. |
| 479 | |
| 480 | Returns: |
| 481 | An integer, the prefix length. |
| 482 | |
| 483 | """ |
Nick Coghlan | 7319f69 | 2012-07-07 21:43:30 +1000 | [diff] [blame] | 484 | return mask - _count_righthand_zero_bits(ip_int, mask) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 485 | |
| 486 | def _ip_string_from_prefix(self, prefixlen=None): |
| 487 | """Turn a prefix length into a dotted decimal string. |
| 488 | |
| 489 | Args: |
| 490 | prefixlen: An integer, the netmask prefix length. |
| 491 | |
| 492 | Returns: |
| 493 | A string, the dotted decimal netmask string. |
| 494 | |
| 495 | """ |
| 496 | if not prefixlen: |
| 497 | prefixlen = self._prefixlen |
| 498 | return self._string_from_ip_int(self._ip_int_from_prefix(prefixlen)) |
| 499 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 500 | class _BaseAddress(_IPAddressBase): |
| 501 | |
| 502 | """A generic IP object. |
| 503 | |
| 504 | This IP class contains the version independent methods which are |
| 505 | used by single IP addresses. |
| 506 | |
| 507 | """ |
| 508 | |
| 509 | def __init__(self, address): |
| 510 | if (not isinstance(address, bytes) |
| 511 | and '/' in str(address)): |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 512 | raise AddressValueError("Unexpected '/' in %r" % address) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 513 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 514 | def __int__(self): |
| 515 | return self._ip |
| 516 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 517 | def __eq__(self, other): |
| 518 | try: |
| 519 | return (self._ip == other._ip |
| 520 | and self._version == other._version) |
| 521 | except AttributeError: |
| 522 | return NotImplemented |
| 523 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 524 | def __lt__(self, other): |
| 525 | if self._version != other._version: |
| 526 | raise TypeError('%s and %s are not of the same version' % ( |
Nick Coghlan | 912238e | 2012-07-07 13:34:50 +1000 | [diff] [blame] | 527 | self, other)) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 528 | if not isinstance(other, _BaseAddress): |
| 529 | raise TypeError('%s and %s are not of the same type' % ( |
Nick Coghlan | 912238e | 2012-07-07 13:34:50 +1000 | [diff] [blame] | 530 | self, other)) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 531 | if self._ip != other._ip: |
| 532 | return self._ip < other._ip |
| 533 | return False |
| 534 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 535 | # Shorthand for Integer addition and subtraction. This is not |
| 536 | # meant to ever support addition/subtraction of addresses. |
| 537 | def __add__(self, other): |
| 538 | if not isinstance(other, int): |
| 539 | return NotImplemented |
Nick Coghlan | 51c3067 | 2012-05-27 00:25:58 +1000 | [diff] [blame] | 540 | return self.__class__(int(self) + other) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 541 | |
| 542 | def __sub__(self, other): |
| 543 | if not isinstance(other, int): |
| 544 | return NotImplemented |
Nick Coghlan | 51c3067 | 2012-05-27 00:25:58 +1000 | [diff] [blame] | 545 | return self.__class__(int(self) - other) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 546 | |
| 547 | def __repr__(self): |
| 548 | return '%s(%r)' % (self.__class__.__name__, str(self)) |
| 549 | |
| 550 | def __str__(self): |
Hynek Schlawack | 072b1e1 | 2012-05-26 12:04:56 +0200 | [diff] [blame] | 551 | return str(self._string_from_ip_int(self._ip)) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 552 | |
| 553 | def __hash__(self): |
| 554 | return hash(hex(int(self._ip))) |
| 555 | |
| 556 | def _get_address_key(self): |
| 557 | return (self._version, self) |
| 558 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 559 | |
| 560 | class _BaseNetwork(_IPAddressBase): |
| 561 | |
Nick Coghlan | 51c3067 | 2012-05-27 00:25:58 +1000 | [diff] [blame] | 562 | """A generic IP network object. |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 563 | |
| 564 | This IP class contains the version independent methods which are |
| 565 | used by networks. |
| 566 | |
| 567 | """ |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 568 | def __init__(self, address): |
| 569 | self._cache = {} |
| 570 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 571 | def __int__(self): |
| 572 | return int(self.network_address) |
| 573 | |
| 574 | def __repr__(self): |
| 575 | return '%s(%r)' % (self.__class__.__name__, str(self)) |
| 576 | |
Hynek Schlawack | 454a74d | 2012-06-04 18:14:02 +0200 | [diff] [blame] | 577 | def __str__(self): |
Nick Coghlan | 912238e | 2012-07-07 13:34:50 +1000 | [diff] [blame] | 578 | return '%s/%d' % (self.network_address, self.prefixlen) |
Hynek Schlawack | 454a74d | 2012-06-04 18:14:02 +0200 | [diff] [blame] | 579 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 580 | def hosts(self): |
| 581 | """Generate Iterator over usable hosts in a network. |
| 582 | |
Sandro Tosi | b95c634 | 2012-05-23 23:17:22 +0200 | [diff] [blame] | 583 | This is like __iter__ except it doesn't return the network |
| 584 | or broadcast addresses. |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 585 | |
| 586 | """ |
Nick Coghlan | 7319f69 | 2012-07-07 21:43:30 +1000 | [diff] [blame] | 587 | network = int(self.network_address) |
| 588 | broadcast = int(self.broadcast_address) |
| 589 | for x in range(network + 1, broadcast): |
| 590 | yield self._address_class(x) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 591 | |
| 592 | def __iter__(self): |
Nick Coghlan | 7319f69 | 2012-07-07 21:43:30 +1000 | [diff] [blame] | 593 | network = int(self.network_address) |
| 594 | broadcast = int(self.broadcast_address) |
| 595 | for x in range(network, broadcast + 1): |
| 596 | yield self._address_class(x) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 597 | |
| 598 | def __getitem__(self, n): |
| 599 | network = int(self.network_address) |
| 600 | broadcast = int(self.broadcast_address) |
| 601 | if n >= 0: |
| 602 | if network + n > broadcast: |
| 603 | raise IndexError |
Nick Coghlan | 51c3067 | 2012-05-27 00:25:58 +1000 | [diff] [blame] | 604 | return self._address_class(network + n) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 605 | else: |
| 606 | n += 1 |
| 607 | if broadcast + n < network: |
| 608 | raise IndexError |
Nick Coghlan | 51c3067 | 2012-05-27 00:25:58 +1000 | [diff] [blame] | 609 | return self._address_class(broadcast + n) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 610 | |
| 611 | def __lt__(self, other): |
| 612 | if self._version != other._version: |
| 613 | raise TypeError('%s and %s are not of the same version' % ( |
Nick Coghlan | 912238e | 2012-07-07 13:34:50 +1000 | [diff] [blame] | 614 | self, other)) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 615 | if not isinstance(other, _BaseNetwork): |
| 616 | raise TypeError('%s and %s are not of the same type' % ( |
Nick Coghlan | 912238e | 2012-07-07 13:34:50 +1000 | [diff] [blame] | 617 | self, other)) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 618 | if self.network_address != other.network_address: |
| 619 | return self.network_address < other.network_address |
| 620 | if self.netmask != other.netmask: |
| 621 | return self.netmask < other.netmask |
| 622 | return False |
| 623 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 624 | def __eq__(self, other): |
Nick Coghlan | 9a9c28c | 2012-07-07 23:05:59 +1000 | [diff] [blame] | 625 | try: |
| 626 | return (self._version == other._version and |
| 627 | self.network_address == other.network_address and |
| 628 | int(self.netmask) == int(other.netmask)) |
| 629 | except AttributeError: |
| 630 | return NotImplemented |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 631 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 632 | def __hash__(self): |
| 633 | return hash(int(self.network_address) ^ int(self.netmask)) |
| 634 | |
| 635 | def __contains__(self, other): |
| 636 | # always false if one is v4 and the other is v6. |
| 637 | if self._version != other._version: |
| 638 | return False |
| 639 | # dealing with another network. |
| 640 | if isinstance(other, _BaseNetwork): |
| 641 | return False |
| 642 | # dealing with another address |
| 643 | else: |
| 644 | # address |
| 645 | return (int(self.network_address) <= int(other._ip) <= |
| 646 | int(self.broadcast_address)) |
| 647 | |
| 648 | def overlaps(self, other): |
| 649 | """Tell if self is partly contained in other.""" |
| 650 | return self.network_address in other or ( |
| 651 | self.broadcast_address in other or ( |
| 652 | other.network_address in self or ( |
| 653 | other.broadcast_address in self))) |
| 654 | |
| 655 | @property |
| 656 | def broadcast_address(self): |
| 657 | x = self._cache.get('broadcast_address') |
| 658 | if x is None: |
Nick Coghlan | 51c3067 | 2012-05-27 00:25:58 +1000 | [diff] [blame] | 659 | x = self._address_class(int(self.network_address) | |
| 660 | int(self.hostmask)) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 661 | self._cache['broadcast_address'] = x |
| 662 | return x |
| 663 | |
| 664 | @property |
| 665 | def hostmask(self): |
| 666 | x = self._cache.get('hostmask') |
| 667 | if x is None: |
Nick Coghlan | 51c3067 | 2012-05-27 00:25:58 +1000 | [diff] [blame] | 668 | x = self._address_class(int(self.netmask) ^ self._ALL_ONES) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 669 | self._cache['hostmask'] = x |
| 670 | return x |
| 671 | |
| 672 | @property |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 673 | def with_prefixlen(self): |
Nick Coghlan | 912238e | 2012-07-07 13:34:50 +1000 | [diff] [blame] | 674 | return '%s/%d' % (self.network_address, self._prefixlen) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 675 | |
| 676 | @property |
| 677 | def with_netmask(self): |
Nick Coghlan | 912238e | 2012-07-07 13:34:50 +1000 | [diff] [blame] | 678 | return '%s/%s' % (self.network_address, self.netmask) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 679 | |
| 680 | @property |
| 681 | def with_hostmask(self): |
Nick Coghlan | 912238e | 2012-07-07 13:34:50 +1000 | [diff] [blame] | 682 | return '%s/%s' % (self.network_address, self.hostmask) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 683 | |
| 684 | @property |
| 685 | def num_addresses(self): |
| 686 | """Number of hosts in the current subnet.""" |
| 687 | return int(self.broadcast_address) - int(self.network_address) + 1 |
| 688 | |
| 689 | @property |
Nick Coghlan | 51c3067 | 2012-05-27 00:25:58 +1000 | [diff] [blame] | 690 | def _address_class(self): |
Nick Coghlan | d972265 | 2012-06-17 16:33:00 +1000 | [diff] [blame] | 691 | # Returning bare address objects (rather than interfaces) allows for |
| 692 | # more consistent behaviour across the network address, broadcast |
| 693 | # address and individual host addresses. |
| 694 | msg = '%200s has no associated address class' % (type(self),) |
| 695 | raise NotImplementedError(msg) |
Nick Coghlan | 51c3067 | 2012-05-27 00:25:58 +1000 | [diff] [blame] | 696 | |
| 697 | @property |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 698 | def prefixlen(self): |
| 699 | return self._prefixlen |
| 700 | |
| 701 | def address_exclude(self, other): |
| 702 | """Remove an address from a larger block. |
| 703 | |
| 704 | For example: |
| 705 | |
| 706 | addr1 = ip_network('192.0.2.0/28') |
| 707 | addr2 = ip_network('192.0.2.1/32') |
| 708 | addr1.address_exclude(addr2) = |
| 709 | [IPv4Network('192.0.2.0/32'), IPv4Network('192.0.2.2/31'), |
| 710 | IPv4Network('192.0.2.4/30'), IPv4Network('192.0.2.8/29')] |
| 711 | |
| 712 | or IPv6: |
| 713 | |
| 714 | addr1 = ip_network('2001:db8::1/32') |
| 715 | addr2 = ip_network('2001:db8::1/128') |
| 716 | addr1.address_exclude(addr2) = |
| 717 | [ip_network('2001:db8::1/128'), |
| 718 | ip_network('2001:db8::2/127'), |
| 719 | ip_network('2001:db8::4/126'), |
| 720 | ip_network('2001:db8::8/125'), |
| 721 | ... |
| 722 | ip_network('2001:db8:8000::/33')] |
| 723 | |
| 724 | Args: |
| 725 | other: An IPv4Network or IPv6Network object of the same type. |
| 726 | |
| 727 | Returns: |
| 728 | An iterator of the the IPv(4|6)Network objects which is self |
| 729 | minus other. |
| 730 | |
| 731 | Raises: |
| 732 | TypeError: If self and other are of difffering address |
| 733 | versions, or if other is not a network object. |
| 734 | ValueError: If other is not completely contained by self. |
| 735 | |
| 736 | """ |
| 737 | if not self._version == other._version: |
| 738 | raise TypeError("%s and %s are not of the same version" % ( |
Nick Coghlan | 912238e | 2012-07-07 13:34:50 +1000 | [diff] [blame] | 739 | self, other)) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 740 | |
| 741 | if not isinstance(other, _BaseNetwork): |
Nick Coghlan | 912238e | 2012-07-07 13:34:50 +1000 | [diff] [blame] | 742 | raise TypeError("%s is not a network object" % other) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 743 | |
| 744 | if not (other.network_address >= self.network_address and |
| 745 | other.broadcast_address <= self.broadcast_address): |
Hynek Schlawack | 072b1e1 | 2012-05-26 12:04:56 +0200 | [diff] [blame] | 746 | raise ValueError('%s not contained in %s' % (other, self)) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 747 | if other == self: |
| 748 | raise StopIteration |
| 749 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 750 | # Make sure we're comparing the network of other. |
Nick Coghlan | 912238e | 2012-07-07 13:34:50 +1000 | [diff] [blame] | 751 | other = other.__class__('%s/%s' % (other.network_address, |
| 752 | other.prefixlen)) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 753 | |
| 754 | s1, s2 = self.subnets() |
| 755 | while s1 != other and s2 != other: |
| 756 | if (other.network_address >= s1.network_address and |
| 757 | other.broadcast_address <= s1.broadcast_address): |
| 758 | yield s2 |
| 759 | s1, s2 = s1.subnets() |
| 760 | elif (other.network_address >= s2.network_address and |
| 761 | other.broadcast_address <= s2.broadcast_address): |
| 762 | yield s1 |
| 763 | s1, s2 = s2.subnets() |
| 764 | else: |
| 765 | # If we got here, there's a bug somewhere. |
| 766 | raise AssertionError('Error performing exclusion: ' |
| 767 | 's1: %s s2: %s other: %s' % |
Nick Coghlan | 912238e | 2012-07-07 13:34:50 +1000 | [diff] [blame] | 768 | (s1, s2, other)) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 769 | if s1 == other: |
| 770 | yield s2 |
| 771 | elif s2 == other: |
| 772 | yield s1 |
| 773 | else: |
| 774 | # If we got here, there's a bug somewhere. |
| 775 | raise AssertionError('Error performing exclusion: ' |
| 776 | 's1: %s s2: %s other: %s' % |
Nick Coghlan | 912238e | 2012-07-07 13:34:50 +1000 | [diff] [blame] | 777 | (s1, s2, other)) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 778 | |
| 779 | def compare_networks(self, other): |
| 780 | """Compare two IP objects. |
| 781 | |
| 782 | This is only concerned about the comparison of the integer |
| 783 | representation of the network addresses. This means that the |
| 784 | host bits aren't considered at all in this method. If you want |
| 785 | to compare host bits, you can easily enough do a |
| 786 | 'HostA._ip < HostB._ip' |
| 787 | |
| 788 | Args: |
| 789 | other: An IP object. |
| 790 | |
| 791 | Returns: |
| 792 | If the IP versions of self and other are the same, returns: |
| 793 | |
| 794 | -1 if self < other: |
| 795 | eg: IPv4Network('192.0.2.0/25') < IPv4Network('192.0.2.128/25') |
| 796 | IPv6Network('2001:db8::1000/124') < |
| 797 | IPv6Network('2001:db8::2000/124') |
| 798 | 0 if self == other |
| 799 | eg: IPv4Network('192.0.2.0/24') == IPv4Network('192.0.2.0/24') |
| 800 | IPv6Network('2001:db8::1000/124') == |
| 801 | IPv6Network('2001:db8::1000/124') |
| 802 | 1 if self > other |
| 803 | eg: IPv4Network('192.0.2.128/25') > IPv4Network('192.0.2.0/25') |
| 804 | IPv6Network('2001:db8::2000/124') > |
| 805 | IPv6Network('2001:db8::1000/124') |
| 806 | |
| 807 | Raises: |
| 808 | TypeError if the IP versions are different. |
| 809 | |
| 810 | """ |
| 811 | # does this need to raise a ValueError? |
| 812 | if self._version != other._version: |
| 813 | raise TypeError('%s and %s are not of the same type' % ( |
Nick Coghlan | 912238e | 2012-07-07 13:34:50 +1000 | [diff] [blame] | 814 | self, other)) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 815 | # self._version == other._version below here: |
| 816 | if self.network_address < other.network_address: |
| 817 | return -1 |
| 818 | if self.network_address > other.network_address: |
| 819 | return 1 |
| 820 | # self.network_address == other.network_address below here: |
| 821 | if self.netmask < other.netmask: |
| 822 | return -1 |
| 823 | if self.netmask > other.netmask: |
| 824 | return 1 |
| 825 | return 0 |
| 826 | |
| 827 | def _get_networks_key(self): |
| 828 | """Network-only key function. |
| 829 | |
| 830 | Returns an object that identifies this address' network and |
| 831 | netmask. This function is a suitable "key" argument for sorted() |
| 832 | and list.sort(). |
| 833 | |
| 834 | """ |
| 835 | return (self._version, self.network_address, self.netmask) |
| 836 | |
| 837 | def subnets(self, prefixlen_diff=1, new_prefix=None): |
| 838 | """The subnets which join to make the current subnet. |
| 839 | |
| 840 | In the case that self contains only one IP |
| 841 | (self._prefixlen == 32 for IPv4 or self._prefixlen == 128 |
| 842 | for IPv6), yield an iterator with just ourself. |
| 843 | |
| 844 | Args: |
| 845 | prefixlen_diff: An integer, the amount the prefix length |
| 846 | should be increased by. This should not be set if |
| 847 | new_prefix is also set. |
| 848 | new_prefix: The desired new prefix length. This must be a |
| 849 | larger number (smaller prefix) than the existing prefix. |
| 850 | This should not be set if prefixlen_diff is also set. |
| 851 | |
| 852 | Returns: |
| 853 | An iterator of IPv(4|6) objects. |
| 854 | |
| 855 | Raises: |
| 856 | ValueError: The prefixlen_diff is too small or too large. |
| 857 | OR |
| 858 | prefixlen_diff and new_prefix are both set or new_prefix |
| 859 | is a smaller number than the current prefix (smaller |
| 860 | number means a larger network) |
| 861 | |
| 862 | """ |
| 863 | if self._prefixlen == self._max_prefixlen: |
| 864 | yield self |
| 865 | return |
| 866 | |
| 867 | if new_prefix is not None: |
| 868 | if new_prefix < self._prefixlen: |
| 869 | raise ValueError('new prefix must be longer') |
| 870 | if prefixlen_diff != 1: |
| 871 | raise ValueError('cannot set prefixlen_diff and new_prefix') |
| 872 | prefixlen_diff = new_prefix - self._prefixlen |
| 873 | |
| 874 | if prefixlen_diff < 0: |
| 875 | raise ValueError('prefix length diff must be > 0') |
| 876 | new_prefixlen = self._prefixlen + prefixlen_diff |
| 877 | |
| 878 | if not self._is_valid_netmask(str(new_prefixlen)): |
| 879 | raise ValueError( |
| 880 | 'prefix length diff %d is invalid for netblock %s' % ( |
Nick Coghlan | 912238e | 2012-07-07 13:34:50 +1000 | [diff] [blame] | 881 | new_prefixlen, self)) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 882 | |
Nick Coghlan | 51c3067 | 2012-05-27 00:25:58 +1000 | [diff] [blame] | 883 | first = self.__class__('%s/%s' % |
Nick Coghlan | 912238e | 2012-07-07 13:34:50 +1000 | [diff] [blame] | 884 | (self.network_address, |
| 885 | self._prefixlen + prefixlen_diff)) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 886 | |
| 887 | yield first |
| 888 | current = first |
| 889 | while True: |
| 890 | broadcast = current.broadcast_address |
| 891 | if broadcast == self.broadcast_address: |
| 892 | return |
Nick Coghlan | 51c3067 | 2012-05-27 00:25:58 +1000 | [diff] [blame] | 893 | new_addr = self._address_class(int(broadcast) + 1) |
Nick Coghlan | 912238e | 2012-07-07 13:34:50 +1000 | [diff] [blame] | 894 | current = self.__class__('%s/%s' % (new_addr, |
| 895 | new_prefixlen)) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 896 | |
| 897 | yield current |
| 898 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 899 | def supernet(self, prefixlen_diff=1, new_prefix=None): |
| 900 | """The supernet containing the current network. |
| 901 | |
| 902 | Args: |
| 903 | prefixlen_diff: An integer, the amount the prefix length of |
| 904 | the network should be decreased by. For example, given a |
| 905 | /24 network and a prefixlen_diff of 3, a supernet with a |
| 906 | /21 netmask is returned. |
| 907 | |
| 908 | Returns: |
| 909 | An IPv4 network object. |
| 910 | |
| 911 | Raises: |
Hynek Schlawack | 072b1e1 | 2012-05-26 12:04:56 +0200 | [diff] [blame] | 912 | ValueError: If self.prefixlen - prefixlen_diff < 0. I.e., you have |
| 913 | a negative prefix length. |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 914 | OR |
| 915 | If prefixlen_diff and new_prefix are both set or new_prefix is a |
| 916 | larger number than the current prefix (larger number means a |
| 917 | smaller network) |
| 918 | |
| 919 | """ |
| 920 | if self._prefixlen == 0: |
| 921 | return self |
| 922 | |
| 923 | if new_prefix is not None: |
| 924 | if new_prefix > self._prefixlen: |
| 925 | raise ValueError('new prefix must be shorter') |
| 926 | if prefixlen_diff != 1: |
| 927 | raise ValueError('cannot set prefixlen_diff and new_prefix') |
| 928 | prefixlen_diff = self._prefixlen - new_prefix |
| 929 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 930 | if self.prefixlen - prefixlen_diff < 0: |
| 931 | raise ValueError( |
| 932 | 'current prefixlen is %d, cannot have a prefixlen_diff of %d' % |
| 933 | (self.prefixlen, prefixlen_diff)) |
| 934 | # TODO (pmoody): optimize this. |
Nick Coghlan | 912238e | 2012-07-07 13:34:50 +1000 | [diff] [blame] | 935 | t = self.__class__('%s/%d' % (self.network_address, |
Nick Coghlan | 51c3067 | 2012-05-27 00:25:58 +1000 | [diff] [blame] | 936 | self.prefixlen - prefixlen_diff), |
| 937 | strict=False) |
Nick Coghlan | 912238e | 2012-07-07 13:34:50 +1000 | [diff] [blame] | 938 | return t.__class__('%s/%d' % (t.network_address, t.prefixlen)) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 939 | |
| 940 | |
Hynek Schlawack | c4b78a3 | 2012-06-01 11:48:32 +0200 | [diff] [blame] | 941 | class _BaseV4: |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 942 | |
| 943 | """Base IPv4 object. |
| 944 | |
| 945 | The following methods are used by IPv4 objects in both single IP |
| 946 | addresses and networks. |
| 947 | |
| 948 | """ |
| 949 | |
| 950 | # Equivalent to 255.255.255.255 or 32 bits of 1's. |
| 951 | _ALL_ONES = (2**IPV4LENGTH) - 1 |
| 952 | _DECIMAL_DIGITS = frozenset('0123456789') |
| 953 | |
Hynek Schlawack | 91c5a34 | 2012-06-05 11:55:58 +0200 | [diff] [blame] | 954 | # the valid octets for host and netmasks. only useful for IPv4. |
Nick Coghlan | 7319f69 | 2012-07-07 21:43:30 +1000 | [diff] [blame] | 955 | _valid_mask_octets = frozenset((255, 254, 252, 248, 240, 224, 192, 128, 0)) |
Hynek Schlawack | 91c5a34 | 2012-06-05 11:55:58 +0200 | [diff] [blame] | 956 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 957 | def __init__(self, address): |
| 958 | self._version = 4 |
| 959 | self._max_prefixlen = IPV4LENGTH |
| 960 | |
| 961 | def _explode_shorthand_ip_string(self): |
| 962 | return str(self) |
| 963 | |
| 964 | def _ip_int_from_string(self, ip_str): |
| 965 | """Turn the given IP string into an integer for comparison. |
| 966 | |
| 967 | Args: |
| 968 | ip_str: A string, the IP ip_str. |
| 969 | |
| 970 | Returns: |
| 971 | The IP ip_str as an integer. |
| 972 | |
| 973 | Raises: |
| 974 | AddressValueError: if ip_str isn't a valid IPv4 Address. |
| 975 | |
| 976 | """ |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 977 | if not ip_str: |
| 978 | raise AddressValueError('Address cannot be empty') |
| 979 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 980 | octets = ip_str.split('.') |
| 981 | if len(octets) != 4: |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 982 | raise AddressValueError("Expected 4 octets in %r" % ip_str) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 983 | |
Nick Coghlan | 7319f69 | 2012-07-07 21:43:30 +1000 | [diff] [blame] | 984 | try: |
| 985 | return int.from_bytes(map(self._parse_octet, octets), 'big') |
| 986 | except ValueError as exc: |
| 987 | raise AddressValueError("%s in %r" % (exc, ip_str)) from None |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 988 | |
| 989 | def _parse_octet(self, octet_str): |
| 990 | """Convert a decimal octet into an integer. |
| 991 | |
| 992 | Args: |
| 993 | octet_str: A string, the number to parse. |
| 994 | |
| 995 | Returns: |
| 996 | The octet as an integer. |
| 997 | |
| 998 | Raises: |
| 999 | ValueError: if the octet isn't strictly a decimal from [0..255]. |
| 1000 | |
| 1001 | """ |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 1002 | if not octet_str: |
| 1003 | raise ValueError("Empty octet not permitted") |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1004 | # Whitelist the characters, since int() allows a lot of bizarre stuff. |
| 1005 | if not self._DECIMAL_DIGITS.issuperset(octet_str): |
Nick Coghlan | 07c4e33 | 2012-07-08 23:06:45 +1000 | [diff] [blame] | 1006 | msg = "Only decimal digits permitted in %r" |
| 1007 | raise ValueError(msg % octet_str) |
| 1008 | # We do the length check second, since the invalid character error |
| 1009 | # is likely to be more informative for the user |
| 1010 | if len(octet_str) > 3: |
| 1011 | msg = "At most 3 characters permitted in %r" |
| 1012 | raise ValueError(msg % octet_str) |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 1013 | # Convert to integer (we know digits are legal) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1014 | octet_int = int(octet_str, 10) |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 1015 | # Any octets that look like they *might* be written in octal, |
| 1016 | # and which don't look exactly the same in both octal and |
| 1017 | # decimal are rejected as ambiguous |
| 1018 | if octet_int > 7 and octet_str[0] == '0': |
Nick Coghlan | 07c4e33 | 2012-07-08 23:06:45 +1000 | [diff] [blame] | 1019 | msg = "Ambiguous (octal/decimal) value in %r not permitted" |
| 1020 | raise ValueError(msg % octet_str) |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 1021 | if octet_int > 255: |
Nick Coghlan | b582ecc | 2012-07-07 22:15:22 +1000 | [diff] [blame] | 1022 | raise ValueError("Octet %d (> 255) not permitted" % octet_int) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1023 | return octet_int |
| 1024 | |
| 1025 | def _string_from_ip_int(self, ip_int): |
| 1026 | """Turns a 32-bit integer into dotted decimal notation. |
| 1027 | |
| 1028 | Args: |
| 1029 | ip_int: An integer, the IP address. |
| 1030 | |
| 1031 | Returns: |
| 1032 | The IP address as a string in dotted decimal notation. |
| 1033 | |
| 1034 | """ |
Nick Coghlan | 7319f69 | 2012-07-07 21:43:30 +1000 | [diff] [blame] | 1035 | return '.'.join(map(str, ip_int.to_bytes(4, 'big'))) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1036 | |
Hynek Schlawack | 91c5a34 | 2012-06-05 11:55:58 +0200 | [diff] [blame] | 1037 | def _is_valid_netmask(self, netmask): |
| 1038 | """Verify that the netmask is valid. |
| 1039 | |
| 1040 | Args: |
| 1041 | netmask: A string, either a prefix or dotted decimal |
| 1042 | netmask. |
| 1043 | |
| 1044 | Returns: |
| 1045 | A boolean, True if the prefix represents a valid IPv4 |
| 1046 | netmask. |
| 1047 | |
| 1048 | """ |
| 1049 | mask = netmask.split('.') |
| 1050 | if len(mask) == 4: |
Nick Coghlan | 7319f69 | 2012-07-07 21:43:30 +1000 | [diff] [blame] | 1051 | try: |
| 1052 | for x in mask: |
| 1053 | if int(x) not in self._valid_mask_octets: |
| 1054 | return False |
| 1055 | except ValueError: |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 1056 | # Found something that isn't an integer or isn't valid |
Hynek Schlawack | 91c5a34 | 2012-06-05 11:55:58 +0200 | [diff] [blame] | 1057 | return False |
Nick Coghlan | 7319f69 | 2012-07-07 21:43:30 +1000 | [diff] [blame] | 1058 | for idx, y in enumerate(mask): |
| 1059 | if idx > 0 and y > mask[idx - 1]: |
| 1060 | return False |
Hynek Schlawack | 91c5a34 | 2012-06-05 11:55:58 +0200 | [diff] [blame] | 1061 | return True |
| 1062 | try: |
| 1063 | netmask = int(netmask) |
| 1064 | except ValueError: |
| 1065 | return False |
| 1066 | return 0 <= netmask <= self._max_prefixlen |
| 1067 | |
| 1068 | def _is_hostmask(self, ip_str): |
| 1069 | """Test if the IP string is a hostmask (rather than a netmask). |
| 1070 | |
| 1071 | Args: |
| 1072 | ip_str: A string, the potential hostmask. |
| 1073 | |
| 1074 | Returns: |
| 1075 | A boolean, True if the IP string is a hostmask. |
| 1076 | |
| 1077 | """ |
| 1078 | bits = ip_str.split('.') |
| 1079 | try: |
Nick Coghlan | 7319f69 | 2012-07-07 21:43:30 +1000 | [diff] [blame] | 1080 | parts = [x for x in map(int, bits) if x in self._valid_mask_octets] |
Hynek Schlawack | 91c5a34 | 2012-06-05 11:55:58 +0200 | [diff] [blame] | 1081 | except ValueError: |
| 1082 | return False |
| 1083 | if len(parts) != len(bits): |
| 1084 | return False |
| 1085 | if parts[0] < parts[-1]: |
| 1086 | return True |
| 1087 | return False |
| 1088 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1089 | @property |
| 1090 | def max_prefixlen(self): |
| 1091 | return self._max_prefixlen |
| 1092 | |
| 1093 | @property |
| 1094 | def version(self): |
| 1095 | return self._version |
| 1096 | |
| 1097 | @property |
| 1098 | def is_reserved(self): |
| 1099 | """Test if the address is otherwise IETF reserved. |
| 1100 | |
| 1101 | Returns: |
| 1102 | A boolean, True if the address is within the |
| 1103 | reserved IPv4 Network range. |
| 1104 | |
| 1105 | """ |
| 1106 | reserved_network = IPv4Network('240.0.0.0/4') |
| 1107 | if isinstance(self, _BaseAddress): |
| 1108 | return self in reserved_network |
| 1109 | return (self.network_address in reserved_network and |
| 1110 | self.broadcast_address in reserved_network) |
| 1111 | |
| 1112 | @property |
| 1113 | def is_private(self): |
| 1114 | """Test if this address is allocated for private networks. |
| 1115 | |
| 1116 | Returns: |
| 1117 | A boolean, True if the address is reserved per RFC 1918. |
| 1118 | |
| 1119 | """ |
| 1120 | private_10 = IPv4Network('10.0.0.0/8') |
| 1121 | private_172 = IPv4Network('172.16.0.0/12') |
| 1122 | private_192 = IPv4Network('192.168.0.0/16') |
| 1123 | if isinstance(self, _BaseAddress): |
| 1124 | return (self in private_10 or self in private_172 or |
| 1125 | self in private_192) |
| 1126 | else: |
| 1127 | return ((self.network_address in private_10 and |
| 1128 | self.broadcast_address in private_10) or |
| 1129 | (self.network_address in private_172 and |
| 1130 | self.broadcast_address in private_172) or |
| 1131 | (self.network_address in private_192 and |
| 1132 | self.broadcast_address in private_192)) |
| 1133 | |
| 1134 | @property |
| 1135 | def is_multicast(self): |
| 1136 | """Test if the address is reserved for multicast use. |
| 1137 | |
| 1138 | Returns: |
| 1139 | A boolean, True if the address is multicast. |
| 1140 | See RFC 3171 for details. |
| 1141 | |
| 1142 | """ |
| 1143 | multicast_network = IPv4Network('224.0.0.0/4') |
| 1144 | if isinstance(self, _BaseAddress): |
| 1145 | return self in IPv4Network('224.0.0.0/4') |
| 1146 | return (self.network_address in multicast_network and |
| 1147 | self.broadcast_address in multicast_network) |
| 1148 | |
| 1149 | @property |
| 1150 | def is_unspecified(self): |
| 1151 | """Test if the address is unspecified. |
| 1152 | |
| 1153 | Returns: |
| 1154 | A boolean, True if this is the unspecified address as defined in |
| 1155 | RFC 5735 3. |
| 1156 | |
| 1157 | """ |
| 1158 | unspecified_address = IPv4Address('0.0.0.0') |
| 1159 | if isinstance(self, _BaseAddress): |
Hynek Schlawack | bcd3044 | 2012-06-04 14:19:39 +0200 | [diff] [blame] | 1160 | return self == unspecified_address |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1161 | return (self.network_address == self.broadcast_address == |
| 1162 | unspecified_address) |
| 1163 | |
| 1164 | @property |
| 1165 | def is_loopback(self): |
| 1166 | """Test if the address is a loopback address. |
| 1167 | |
| 1168 | Returns: |
| 1169 | A boolean, True if the address is a loopback per RFC 3330. |
| 1170 | |
| 1171 | """ |
| 1172 | loopback_address = IPv4Network('127.0.0.0/8') |
| 1173 | if isinstance(self, _BaseAddress): |
| 1174 | return self in loopback_address |
| 1175 | |
| 1176 | return (self.network_address in loopback_address and |
| 1177 | self.broadcast_address in loopback_address) |
| 1178 | |
| 1179 | @property |
| 1180 | def is_link_local(self): |
| 1181 | """Test if the address is reserved for link-local. |
| 1182 | |
| 1183 | Returns: |
| 1184 | A boolean, True if the address is link-local per RFC 3927. |
| 1185 | |
| 1186 | """ |
| 1187 | linklocal_network = IPv4Network('169.254.0.0/16') |
| 1188 | if isinstance(self, _BaseAddress): |
| 1189 | return self in linklocal_network |
| 1190 | return (self.network_address in linklocal_network and |
| 1191 | self.broadcast_address in linklocal_network) |
| 1192 | |
| 1193 | |
| 1194 | class IPv4Address(_BaseV4, _BaseAddress): |
| 1195 | |
| 1196 | """Represent and manipulate single IPv4 Addresses.""" |
| 1197 | |
| 1198 | def __init__(self, address): |
| 1199 | |
| 1200 | """ |
| 1201 | Args: |
| 1202 | address: A string or integer representing the IP |
| 1203 | |
| 1204 | Additionally, an integer can be passed, so |
| 1205 | IPv4Address('192.0.2.1') == IPv4Address(3221225985). |
| 1206 | or, more generally |
| 1207 | IPv4Address(int(IPv4Address('192.0.2.1'))) == |
| 1208 | IPv4Address('192.0.2.1') |
| 1209 | |
| 1210 | Raises: |
Sandro Tosi | b4386d3 | 2012-06-02 17:14:22 +0200 | [diff] [blame] | 1211 | AddressValueError: If ipaddress isn't a valid IPv4 address. |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1212 | |
| 1213 | """ |
| 1214 | _BaseAddress.__init__(self, address) |
| 1215 | _BaseV4.__init__(self, address) |
| 1216 | |
| 1217 | # Efficient constructor from integer. |
| 1218 | if isinstance(address, int): |
Nick Coghlan | 297b143 | 2012-07-08 17:11:04 +1000 | [diff] [blame] | 1219 | self._check_int_address(address) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1220 | self._ip = address |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1221 | return |
| 1222 | |
| 1223 | # Constructing from a packed address |
Nick Coghlan | 5cf896f | 2012-07-07 01:43:31 +1000 | [diff] [blame] | 1224 | if isinstance(address, bytes): |
Nick Coghlan | 297b143 | 2012-07-08 17:11:04 +1000 | [diff] [blame] | 1225 | self._check_packed_address(address, 4) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1226 | self._ip = struct.unpack('!I', address)[0] |
| 1227 | return |
| 1228 | |
| 1229 | # Assume input argument to be string or any object representation |
| 1230 | # which converts into a formatted IP string. |
| 1231 | addr_str = str(address) |
| 1232 | self._ip = self._ip_int_from_string(addr_str) |
| 1233 | |
| 1234 | @property |
| 1235 | def packed(self): |
| 1236 | """The binary representation of this address.""" |
| 1237 | return v4_int_to_packed(self._ip) |
| 1238 | |
| 1239 | |
| 1240 | class IPv4Interface(IPv4Address): |
| 1241 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1242 | def __init__(self, address): |
| 1243 | if isinstance(address, (bytes, int)): |
| 1244 | IPv4Address.__init__(self, address) |
| 1245 | self.network = IPv4Network(self._ip) |
| 1246 | self._prefixlen = self._max_prefixlen |
| 1247 | return |
| 1248 | |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 1249 | addr = _split_optional_netmask(address) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1250 | IPv4Address.__init__(self, addr[0]) |
| 1251 | |
| 1252 | self.network = IPv4Network(address, strict=False) |
| 1253 | self._prefixlen = self.network._prefixlen |
| 1254 | |
| 1255 | self.netmask = self.network.netmask |
| 1256 | self.hostmask = self.network.hostmask |
| 1257 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1258 | def __str__(self): |
| 1259 | return '%s/%d' % (self._string_from_ip_int(self._ip), |
| 1260 | self.network.prefixlen) |
| 1261 | |
| 1262 | def __eq__(self, other): |
Nick Coghlan | 3008ec0 | 2012-07-08 00:45:33 +1000 | [diff] [blame] | 1263 | address_equal = IPv4Address.__eq__(self, other) |
| 1264 | if not address_equal or address_equal is NotImplemented: |
| 1265 | return address_equal |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1266 | try: |
Nick Coghlan | 3008ec0 | 2012-07-08 00:45:33 +1000 | [diff] [blame] | 1267 | return self.network == other.network |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1268 | except AttributeError: |
Nick Coghlan | 3008ec0 | 2012-07-08 00:45:33 +1000 | [diff] [blame] | 1269 | # An interface with an associated network is NOT the |
| 1270 | # same as an unassociated address. That's why the hash |
| 1271 | # takes the extra info into account. |
| 1272 | return False |
| 1273 | |
| 1274 | def __lt__(self, other): |
| 1275 | address_less = IPv4Address.__lt__(self, other) |
| 1276 | if address_less is NotImplemented: |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1277 | return NotImplemented |
Nick Coghlan | 3008ec0 | 2012-07-08 00:45:33 +1000 | [diff] [blame] | 1278 | try: |
| 1279 | return self.network < other.network |
| 1280 | except AttributeError: |
| 1281 | # We *do* allow addresses and interfaces to be sorted. The |
| 1282 | # unassociated address is considered less than all interfaces. |
| 1283 | return False |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1284 | |
| 1285 | def __hash__(self): |
| 1286 | return self._ip ^ self._prefixlen ^ int(self.network.network_address) |
| 1287 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1288 | @property |
| 1289 | def prefixlen(self): |
| 1290 | return self._prefixlen |
| 1291 | |
| 1292 | @property |
| 1293 | def ip(self): |
| 1294 | return IPv4Address(self._ip) |
| 1295 | |
| 1296 | @property |
| 1297 | def with_prefixlen(self): |
| 1298 | return self |
| 1299 | |
| 1300 | @property |
| 1301 | def with_netmask(self): |
| 1302 | return '%s/%s' % (self._string_from_ip_int(self._ip), |
| 1303 | self.netmask) |
Hynek Schlawack | 072b1e1 | 2012-05-26 12:04:56 +0200 | [diff] [blame] | 1304 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1305 | @property |
| 1306 | def with_hostmask(self): |
| 1307 | return '%s/%s' % (self._string_from_ip_int(self._ip), |
| 1308 | self.hostmask) |
| 1309 | |
| 1310 | |
| 1311 | class IPv4Network(_BaseV4, _BaseNetwork): |
| 1312 | |
| 1313 | """This class represents and manipulates 32-bit IPv4 network + addresses.. |
| 1314 | |
| 1315 | Attributes: [examples for IPv4Network('192.0.2.0/27')] |
| 1316 | .network_address: IPv4Address('192.0.2.0') |
| 1317 | .hostmask: IPv4Address('0.0.0.31') |
| 1318 | .broadcast_address: IPv4Address('192.0.2.32') |
| 1319 | .netmask: IPv4Address('255.255.255.224') |
| 1320 | .prefixlen: 27 |
| 1321 | |
| 1322 | """ |
Nick Coghlan | 51c3067 | 2012-05-27 00:25:58 +1000 | [diff] [blame] | 1323 | # Class to use when creating address objects |
Nick Coghlan | 51c3067 | 2012-05-27 00:25:58 +1000 | [diff] [blame] | 1324 | _address_class = IPv4Address |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1325 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1326 | def __init__(self, address, strict=True): |
| 1327 | |
| 1328 | """Instantiate a new IPv4 network object. |
| 1329 | |
| 1330 | Args: |
| 1331 | address: A string or integer representing the IP [& network]. |
| 1332 | '192.0.2.0/24' |
| 1333 | '192.0.2.0/255.255.255.0' |
| 1334 | '192.0.0.2/0.0.0.255' |
| 1335 | are all functionally the same in IPv4. Similarly, |
| 1336 | '192.0.2.1' |
| 1337 | '192.0.2.1/255.255.255.255' |
| 1338 | '192.0.2.1/32' |
| 1339 | are also functionaly equivalent. That is to say, failing to |
| 1340 | provide a subnetmask will create an object with a mask of /32. |
| 1341 | |
| 1342 | If the mask (portion after the / in the argument) is given in |
| 1343 | dotted quad form, it is treated as a netmask if it starts with a |
| 1344 | non-zero field (e.g. /255.0.0.0 == /8) and as a hostmask if it |
| 1345 | starts with a zero field (e.g. 0.255.255.255 == /8), with the |
| 1346 | single exception of an all-zero mask which is treated as a |
| 1347 | netmask == /0. If no mask is given, a default of /32 is used. |
| 1348 | |
| 1349 | Additionally, an integer can be passed, so |
| 1350 | IPv4Network('192.0.2.1') == IPv4Network(3221225985) |
| 1351 | or, more generally |
| 1352 | IPv4Interface(int(IPv4Interface('192.0.2.1'))) == |
| 1353 | IPv4Interface('192.0.2.1') |
| 1354 | |
| 1355 | Raises: |
Sandro Tosi | b4386d3 | 2012-06-02 17:14:22 +0200 | [diff] [blame] | 1356 | AddressValueError: If ipaddress isn't a valid IPv4 address. |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1357 | NetmaskValueError: If the netmask isn't valid for |
| 1358 | an IPv4 address. |
Sandro Tosi | b4386d3 | 2012-06-02 17:14:22 +0200 | [diff] [blame] | 1359 | ValueError: If strict is True and a network address is not |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1360 | supplied. |
| 1361 | |
| 1362 | """ |
| 1363 | |
| 1364 | _BaseV4.__init__(self, address) |
| 1365 | _BaseNetwork.__init__(self, address) |
| 1366 | |
| 1367 | # Constructing from a packed address |
Nick Coghlan | 5cf896f | 2012-07-07 01:43:31 +1000 | [diff] [blame] | 1368 | if isinstance(address, bytes): |
Nick Coghlan | 297b143 | 2012-07-08 17:11:04 +1000 | [diff] [blame] | 1369 | self.network_address = IPv4Address(address) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1370 | self._prefixlen = self._max_prefixlen |
| 1371 | self.netmask = IPv4Address(self._ALL_ONES) |
| 1372 | #fixme: address/network test here |
| 1373 | return |
| 1374 | |
| 1375 | # Efficient constructor from integer. |
| 1376 | if isinstance(address, int): |
Nick Coghlan | 297b143 | 2012-07-08 17:11:04 +1000 | [diff] [blame] | 1377 | self.network_address = IPv4Address(address) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1378 | self._prefixlen = self._max_prefixlen |
| 1379 | self.netmask = IPv4Address(self._ALL_ONES) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1380 | #fixme: address/network test here. |
| 1381 | return |
| 1382 | |
| 1383 | # Assume input argument to be string or any object representation |
| 1384 | # which converts into a formatted IP prefix string. |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 1385 | addr = _split_optional_netmask(address) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1386 | self.network_address = IPv4Address(self._ip_int_from_string(addr[0])) |
| 1387 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1388 | if len(addr) == 2: |
| 1389 | mask = addr[1].split('.') |
| 1390 | |
| 1391 | if len(mask) == 4: |
| 1392 | # We have dotted decimal netmask. |
| 1393 | if self._is_valid_netmask(addr[1]): |
| 1394 | self.netmask = IPv4Address(self._ip_int_from_string( |
| 1395 | addr[1])) |
| 1396 | elif self._is_hostmask(addr[1]): |
| 1397 | self.netmask = IPv4Address( |
| 1398 | self._ip_int_from_string(addr[1]) ^ self._ALL_ONES) |
| 1399 | else: |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 1400 | raise NetmaskValueError('%r is not a valid netmask' |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1401 | % addr[1]) |
| 1402 | |
| 1403 | self._prefixlen = self._prefix_from_ip_int(int(self.netmask)) |
| 1404 | else: |
| 1405 | # We have a netmask in prefix length form. |
| 1406 | if not self._is_valid_netmask(addr[1]): |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 1407 | raise NetmaskValueError('%r is not a valid netmask' |
| 1408 | % addr[1]) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1409 | self._prefixlen = int(addr[1]) |
| 1410 | self.netmask = IPv4Address(self._ip_int_from_prefix( |
| 1411 | self._prefixlen)) |
| 1412 | else: |
| 1413 | self._prefixlen = self._max_prefixlen |
| 1414 | self.netmask = IPv4Address(self._ip_int_from_prefix( |
| 1415 | self._prefixlen)) |
| 1416 | |
| 1417 | if strict: |
| 1418 | if (IPv4Address(int(self.network_address) & int(self.netmask)) != |
| 1419 | self.network_address): |
| 1420 | raise ValueError('%s has host bits set' % self) |
| 1421 | self.network_address = IPv4Address(int(self.network_address) & |
| 1422 | int(self.netmask)) |
| 1423 | |
| 1424 | if self._prefixlen == (self._max_prefixlen - 1): |
| 1425 | self.hosts = self.__iter__ |
| 1426 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1427 | |
Hynek Schlawack | c4b78a3 | 2012-06-01 11:48:32 +0200 | [diff] [blame] | 1428 | class _BaseV6: |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1429 | |
| 1430 | """Base IPv6 object. |
| 1431 | |
| 1432 | The following methods are used by IPv6 objects in both single IP |
| 1433 | addresses and networks. |
| 1434 | |
| 1435 | """ |
| 1436 | |
| 1437 | _ALL_ONES = (2**IPV6LENGTH) - 1 |
| 1438 | _HEXTET_COUNT = 8 |
| 1439 | _HEX_DIGITS = frozenset('0123456789ABCDEFabcdef') |
| 1440 | |
| 1441 | def __init__(self, address): |
| 1442 | self._version = 6 |
| 1443 | self._max_prefixlen = IPV6LENGTH |
| 1444 | |
| 1445 | def _ip_int_from_string(self, ip_str): |
| 1446 | """Turn an IPv6 ip_str into an integer. |
| 1447 | |
| 1448 | Args: |
| 1449 | ip_str: A string, the IPv6 ip_str. |
| 1450 | |
| 1451 | Returns: |
| 1452 | An int, the IPv6 address |
| 1453 | |
| 1454 | Raises: |
| 1455 | AddressValueError: if ip_str isn't a valid IPv6 Address. |
| 1456 | |
| 1457 | """ |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 1458 | if not ip_str: |
| 1459 | raise AddressValueError('Address cannot be empty') |
| 1460 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1461 | parts = ip_str.split(':') |
| 1462 | |
| 1463 | # An IPv6 address needs at least 2 colons (3 parts). |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 1464 | _min_parts = 3 |
| 1465 | if len(parts) < _min_parts: |
| 1466 | msg = "At least %d parts expected in %r" % (_min_parts, ip_str) |
| 1467 | raise AddressValueError(msg) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1468 | |
| 1469 | # If the address has an IPv4-style suffix, convert it to hexadecimal. |
| 1470 | if '.' in parts[-1]: |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 1471 | try: |
| 1472 | ipv4_int = IPv4Address(parts.pop())._ip |
| 1473 | except AddressValueError as exc: |
| 1474 | raise AddressValueError("%s in %r" % (exc, ip_str)) from None |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1475 | parts.append('%x' % ((ipv4_int >> 16) & 0xFFFF)) |
| 1476 | parts.append('%x' % (ipv4_int & 0xFFFF)) |
| 1477 | |
| 1478 | # An IPv6 address can't have more than 8 colons (9 parts). |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 1479 | # The extra colon comes from using the "::" notation for a single |
| 1480 | # leading or trailing zero part. |
| 1481 | _max_parts = self._HEXTET_COUNT + 1 |
| 1482 | if len(parts) > _max_parts: |
| 1483 | msg = "At most %d colons permitted in %r" % (_max_parts-1, ip_str) |
| 1484 | raise AddressValueError(msg) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1485 | |
| 1486 | # Disregarding the endpoints, find '::' with nothing in between. |
| 1487 | # This indicates that a run of zeroes has been skipped. |
Nick Coghlan | 7319f69 | 2012-07-07 21:43:30 +1000 | [diff] [blame] | 1488 | skip_index = None |
| 1489 | for i in range(1, len(parts) - 1): |
| 1490 | if not parts[i]: |
| 1491 | if skip_index is not None: |
| 1492 | # Can't have more than one '::' |
| 1493 | msg = "At most one '::' permitted in %r" % ip_str |
| 1494 | raise AddressValueError(msg) |
| 1495 | skip_index = i |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1496 | |
| 1497 | # parts_hi is the number of parts to copy from above/before the '::' |
| 1498 | # parts_lo is the number of parts to copy from below/after the '::' |
| 1499 | if skip_index is not None: |
| 1500 | # If we found a '::', then check if it also covers the endpoints. |
| 1501 | parts_hi = skip_index |
| 1502 | parts_lo = len(parts) - skip_index - 1 |
| 1503 | if not parts[0]: |
| 1504 | parts_hi -= 1 |
| 1505 | if parts_hi: |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 1506 | msg = "Leading ':' only permitted as part of '::' in %r" |
| 1507 | raise AddressValueError(msg % ip_str) # ^: requires ^:: |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1508 | if not parts[-1]: |
| 1509 | parts_lo -= 1 |
| 1510 | if parts_lo: |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 1511 | msg = "Trailing ':' only permitted as part of '::' in %r" |
| 1512 | raise AddressValueError(msg % ip_str) # :$ requires ::$ |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1513 | parts_skipped = self._HEXTET_COUNT - (parts_hi + parts_lo) |
| 1514 | if parts_skipped < 1: |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 1515 | msg = "Expected at most %d other parts with '::' in %r" |
| 1516 | raise AddressValueError(msg % (self._HEXTET_COUNT-1, ip_str)) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1517 | else: |
Hynek Schlawack | 072b1e1 | 2012-05-26 12:04:56 +0200 | [diff] [blame] | 1518 | # Otherwise, allocate the entire address to parts_hi. The |
| 1519 | # endpoints could still be empty, but _parse_hextet() will check |
| 1520 | # for that. |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1521 | if len(parts) != self._HEXTET_COUNT: |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 1522 | msg = "Exactly %d parts expected without '::' in %r" |
| 1523 | raise AddressValueError(msg % (self._HEXTET_COUNT, ip_str)) |
| 1524 | if not parts[0]: |
| 1525 | msg = "Leading ':' only permitted as part of '::' in %r" |
| 1526 | raise AddressValueError(msg % ip_str) # ^: requires ^:: |
| 1527 | if not parts[-1]: |
| 1528 | msg = "Trailing ':' only permitted as part of '::' in %r" |
| 1529 | raise AddressValueError(msg % ip_str) # :$ requires ::$ |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1530 | parts_hi = len(parts) |
| 1531 | parts_lo = 0 |
| 1532 | parts_skipped = 0 |
| 1533 | |
| 1534 | try: |
| 1535 | # Now, parse the hextets into a 128-bit integer. |
| 1536 | ip_int = 0 |
| 1537 | for i in range(parts_hi): |
| 1538 | ip_int <<= 16 |
| 1539 | ip_int |= self._parse_hextet(parts[i]) |
| 1540 | ip_int <<= 16 * parts_skipped |
| 1541 | for i in range(-parts_lo, 0): |
| 1542 | ip_int <<= 16 |
| 1543 | ip_int |= self._parse_hextet(parts[i]) |
| 1544 | return ip_int |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 1545 | except ValueError as exc: |
| 1546 | raise AddressValueError("%s in %r" % (exc, ip_str)) from None |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1547 | |
| 1548 | def _parse_hextet(self, hextet_str): |
| 1549 | """Convert an IPv6 hextet string into an integer. |
| 1550 | |
| 1551 | Args: |
| 1552 | hextet_str: A string, the number to parse. |
| 1553 | |
| 1554 | Returns: |
| 1555 | The hextet as an integer. |
| 1556 | |
| 1557 | Raises: |
Hynek Schlawack | 072b1e1 | 2012-05-26 12:04:56 +0200 | [diff] [blame] | 1558 | ValueError: if the input isn't strictly a hex number from |
| 1559 | [0..FFFF]. |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1560 | |
| 1561 | """ |
| 1562 | # Whitelist the characters, since int() allows a lot of bizarre stuff. |
| 1563 | if not self._HEX_DIGITS.issuperset(hextet_str): |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 1564 | raise ValueError("Only hex digits permitted in %r" % hextet_str) |
Nick Coghlan | 07c4e33 | 2012-07-08 23:06:45 +1000 | [diff] [blame] | 1565 | # We do the length check second, since the invalid character error |
| 1566 | # is likely to be more informative for the user |
Nick Coghlan | 3c2570c | 2012-07-07 01:13:55 +1000 | [diff] [blame] | 1567 | if len(hextet_str) > 4: |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 1568 | msg = "At most 4 characters permitted in %r" |
| 1569 | raise ValueError(msg % hextet_str) |
Nick Coghlan | 07c4e33 | 2012-07-08 23:06:45 +1000 | [diff] [blame] | 1570 | # Length check means we can skip checking the integer value |
| 1571 | return int(hextet_str, 16) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1572 | |
| 1573 | def _compress_hextets(self, hextets): |
| 1574 | """Compresses a list of hextets. |
| 1575 | |
| 1576 | Compresses a list of strings, replacing the longest continuous |
| 1577 | sequence of "0" in the list with "" and adding empty strings at |
| 1578 | the beginning or at the end of the string such that subsequently |
| 1579 | calling ":".join(hextets) will produce the compressed version of |
| 1580 | the IPv6 address. |
| 1581 | |
| 1582 | Args: |
| 1583 | hextets: A list of strings, the hextets to compress. |
| 1584 | |
| 1585 | Returns: |
| 1586 | A list of strings. |
| 1587 | |
| 1588 | """ |
| 1589 | best_doublecolon_start = -1 |
| 1590 | best_doublecolon_len = 0 |
| 1591 | doublecolon_start = -1 |
| 1592 | doublecolon_len = 0 |
| 1593 | for index in range(len(hextets)): |
| 1594 | if hextets[index] == '0': |
| 1595 | doublecolon_len += 1 |
| 1596 | if doublecolon_start == -1: |
| 1597 | # Start of a sequence of zeros. |
| 1598 | doublecolon_start = index |
| 1599 | if doublecolon_len > best_doublecolon_len: |
| 1600 | # This is the longest sequence of zeros so far. |
| 1601 | best_doublecolon_len = doublecolon_len |
| 1602 | best_doublecolon_start = doublecolon_start |
| 1603 | else: |
| 1604 | doublecolon_len = 0 |
| 1605 | doublecolon_start = -1 |
| 1606 | |
| 1607 | if best_doublecolon_len > 1: |
| 1608 | best_doublecolon_end = (best_doublecolon_start + |
| 1609 | best_doublecolon_len) |
| 1610 | # For zeros at the end of the address. |
| 1611 | if best_doublecolon_end == len(hextets): |
| 1612 | hextets += [''] |
| 1613 | hextets[best_doublecolon_start:best_doublecolon_end] = [''] |
| 1614 | # For zeros at the beginning of the address. |
| 1615 | if best_doublecolon_start == 0: |
| 1616 | hextets = [''] + hextets |
| 1617 | |
| 1618 | return hextets |
| 1619 | |
| 1620 | def _string_from_ip_int(self, ip_int=None): |
| 1621 | """Turns a 128-bit integer into hexadecimal notation. |
| 1622 | |
| 1623 | Args: |
| 1624 | ip_int: An integer, the IP address. |
| 1625 | |
| 1626 | Returns: |
| 1627 | A string, the hexadecimal representation of the address. |
| 1628 | |
| 1629 | Raises: |
| 1630 | ValueError: The address is bigger than 128 bits of all ones. |
| 1631 | |
| 1632 | """ |
Hynek Schlawack | 91c5a34 | 2012-06-05 11:55:58 +0200 | [diff] [blame] | 1633 | if ip_int is None: |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1634 | ip_int = int(self._ip) |
| 1635 | |
| 1636 | if ip_int > self._ALL_ONES: |
| 1637 | raise ValueError('IPv6 address is too large') |
| 1638 | |
| 1639 | hex_str = '%032x' % ip_int |
Nick Coghlan | 7319f69 | 2012-07-07 21:43:30 +1000 | [diff] [blame] | 1640 | hextets = ['%x' % int(hex_str[x:x+4], 16) for x in range(0, 32, 4)] |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1641 | |
| 1642 | hextets = self._compress_hextets(hextets) |
| 1643 | return ':'.join(hextets) |
| 1644 | |
| 1645 | def _explode_shorthand_ip_string(self): |
| 1646 | """Expand a shortened IPv6 address. |
| 1647 | |
| 1648 | Args: |
| 1649 | ip_str: A string, the IPv6 address. |
| 1650 | |
| 1651 | Returns: |
| 1652 | A string, the expanded IPv6 address. |
| 1653 | |
| 1654 | """ |
| 1655 | if isinstance(self, IPv6Network): |
| 1656 | ip_str = str(self.network_address) |
| 1657 | elif isinstance(self, IPv6Interface): |
| 1658 | ip_str = str(self.ip) |
| 1659 | else: |
| 1660 | ip_str = str(self) |
| 1661 | |
| 1662 | ip_int = self._ip_int_from_string(ip_str) |
Nick Coghlan | 7319f69 | 2012-07-07 21:43:30 +1000 | [diff] [blame] | 1663 | hex_str = '%032x' % ip_int |
| 1664 | parts = [hex_str[x:x+4] for x in range(0, 32, 4)] |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1665 | if isinstance(self, (_BaseNetwork, IPv6Interface)): |
| 1666 | return '%s/%d' % (':'.join(parts), self.prefixlen) |
| 1667 | return ':'.join(parts) |
| 1668 | |
| 1669 | @property |
| 1670 | def max_prefixlen(self): |
| 1671 | return self._max_prefixlen |
| 1672 | |
| 1673 | @property |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1674 | def version(self): |
| 1675 | return self._version |
| 1676 | |
| 1677 | @property |
| 1678 | def is_multicast(self): |
| 1679 | """Test if the address is reserved for multicast use. |
| 1680 | |
| 1681 | Returns: |
| 1682 | A boolean, True if the address is a multicast address. |
| 1683 | See RFC 2373 2.7 for details. |
| 1684 | |
| 1685 | """ |
| 1686 | multicast_network = IPv6Network('ff00::/8') |
| 1687 | if isinstance(self, _BaseAddress): |
| 1688 | return self in multicast_network |
| 1689 | return (self.network_address in multicast_network and |
| 1690 | self.broadcast_address in multicast_network) |
| 1691 | |
| 1692 | @property |
| 1693 | def is_reserved(self): |
| 1694 | """Test if the address is otherwise IETF reserved. |
| 1695 | |
| 1696 | Returns: |
| 1697 | A boolean, True if the address is within one of the |
| 1698 | reserved IPv6 Network ranges. |
| 1699 | |
| 1700 | """ |
| 1701 | reserved_networks = [IPv6Network('::/8'), IPv6Network('100::/8'), |
| 1702 | IPv6Network('200::/7'), IPv6Network('400::/6'), |
| 1703 | IPv6Network('800::/5'), IPv6Network('1000::/4'), |
| 1704 | IPv6Network('4000::/3'), IPv6Network('6000::/3'), |
| 1705 | IPv6Network('8000::/3'), IPv6Network('A000::/3'), |
| 1706 | IPv6Network('C000::/3'), IPv6Network('E000::/4'), |
| 1707 | IPv6Network('F000::/5'), IPv6Network('F800::/6'), |
| 1708 | IPv6Network('FE00::/9')] |
| 1709 | |
| 1710 | if isinstance(self, _BaseAddress): |
Nick Coghlan | 7319f69 | 2012-07-07 21:43:30 +1000 | [diff] [blame] | 1711 | return any(self in x for x in reserved_networks) |
| 1712 | return any(self.network_address in x and self.broadcast_address in x |
| 1713 | for x in reserved_networks) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1714 | |
| 1715 | @property |
| 1716 | def is_link_local(self): |
| 1717 | """Test if the address is reserved for link-local. |
| 1718 | |
| 1719 | Returns: |
| 1720 | A boolean, True if the address is reserved per RFC 4291. |
| 1721 | |
| 1722 | """ |
| 1723 | linklocal_network = IPv6Network('fe80::/10') |
| 1724 | if isinstance(self, _BaseAddress): |
| 1725 | return self in linklocal_network |
| 1726 | return (self.network_address in linklocal_network and |
| 1727 | self.broadcast_address in linklocal_network) |
| 1728 | |
| 1729 | @property |
| 1730 | def is_site_local(self): |
| 1731 | """Test if the address is reserved for site-local. |
| 1732 | |
| 1733 | Note that the site-local address space has been deprecated by RFC 3879. |
| 1734 | Use is_private to test if this address is in the space of unique local |
| 1735 | addresses as defined by RFC 4193. |
| 1736 | |
| 1737 | Returns: |
| 1738 | A boolean, True if the address is reserved per RFC 3513 2.5.6. |
| 1739 | |
| 1740 | """ |
| 1741 | sitelocal_network = IPv6Network('fec0::/10') |
| 1742 | if isinstance(self, _BaseAddress): |
| 1743 | return self in sitelocal_network |
| 1744 | return (self.network_address in sitelocal_network and |
| 1745 | self.broadcast_address in sitelocal_network) |
| 1746 | |
| 1747 | @property |
| 1748 | def is_private(self): |
| 1749 | """Test if this address is allocated for private networks. |
| 1750 | |
| 1751 | Returns: |
| 1752 | A boolean, True if the address is reserved per RFC 4193. |
| 1753 | |
| 1754 | """ |
| 1755 | private_network = IPv6Network('fc00::/7') |
| 1756 | if isinstance(self, _BaseAddress): |
| 1757 | return self in private_network |
| 1758 | return (self.network_address in private_network and |
| 1759 | self.broadcast_address in private_network) |
| 1760 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1761 | @property |
| 1762 | def ipv4_mapped(self): |
| 1763 | """Return the IPv4 mapped address. |
| 1764 | |
| 1765 | Returns: |
| 1766 | If the IPv6 address is a v4 mapped address, return the |
| 1767 | IPv4 mapped address. Return None otherwise. |
| 1768 | |
| 1769 | """ |
| 1770 | if (self._ip >> 32) != 0xFFFF: |
| 1771 | return None |
| 1772 | return IPv4Address(self._ip & 0xFFFFFFFF) |
| 1773 | |
| 1774 | @property |
| 1775 | def teredo(self): |
| 1776 | """Tuple of embedded teredo IPs. |
| 1777 | |
| 1778 | Returns: |
| 1779 | Tuple of the (server, client) IPs or None if the address |
| 1780 | doesn't appear to be a teredo address (doesn't start with |
| 1781 | 2001::/32) |
| 1782 | |
| 1783 | """ |
| 1784 | if (self._ip >> 96) != 0x20010000: |
| 1785 | return None |
| 1786 | return (IPv4Address((self._ip >> 64) & 0xFFFFFFFF), |
| 1787 | IPv4Address(~self._ip & 0xFFFFFFFF)) |
| 1788 | |
| 1789 | @property |
| 1790 | def sixtofour(self): |
| 1791 | """Return the IPv4 6to4 embedded address. |
| 1792 | |
| 1793 | Returns: |
| 1794 | The IPv4 6to4-embedded address if present or None if the |
| 1795 | address doesn't appear to contain a 6to4 embedded address. |
| 1796 | |
| 1797 | """ |
| 1798 | if (self._ip >> 112) != 0x2002: |
| 1799 | return None |
| 1800 | return IPv4Address((self._ip >> 80) & 0xFFFFFFFF) |
| 1801 | |
| 1802 | @property |
| 1803 | def is_unspecified(self): |
| 1804 | """Test if the address is unspecified. |
| 1805 | |
| 1806 | Returns: |
| 1807 | A boolean, True if this is the unspecified address as defined in |
| 1808 | RFC 2373 2.5.2. |
| 1809 | |
| 1810 | """ |
| 1811 | if isinstance(self, (IPv6Network, IPv6Interface)): |
| 1812 | return int(self.network_address) == 0 and getattr( |
| 1813 | self, '_prefixlen', 128) == 128 |
| 1814 | return self._ip == 0 |
| 1815 | |
| 1816 | @property |
| 1817 | def is_loopback(self): |
| 1818 | """Test if the address is a loopback address. |
| 1819 | |
| 1820 | Returns: |
| 1821 | A boolean, True if the address is a loopback address as defined in |
| 1822 | RFC 2373 2.5.3. |
| 1823 | |
| 1824 | """ |
| 1825 | if isinstance(self, IPv6Network): |
Nick Coghlan | 2c58910 | 2012-05-27 01:03:25 +1000 | [diff] [blame] | 1826 | return int(self) == 1 and getattr( |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1827 | self, '_prefixlen', 128) == 128 |
| 1828 | elif isinstance(self, IPv6Interface): |
| 1829 | return int(self.network.network_address) == 1 and getattr( |
| 1830 | self, '_prefixlen', 128) == 128 |
| 1831 | return self._ip == 1 |
| 1832 | |
| 1833 | |
| 1834 | class IPv6Address(_BaseV6, _BaseAddress): |
| 1835 | |
Sandro Tosi | b95c634 | 2012-05-23 23:17:22 +0200 | [diff] [blame] | 1836 | """Represent and manipulate single IPv6 Addresses.""" |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1837 | |
| 1838 | def __init__(self, address): |
| 1839 | """Instantiate a new IPv6 address object. |
| 1840 | |
| 1841 | Args: |
| 1842 | address: A string or integer representing the IP |
| 1843 | |
| 1844 | Additionally, an integer can be passed, so |
| 1845 | IPv6Address('2001:db8::') == |
| 1846 | IPv6Address(42540766411282592856903984951653826560) |
| 1847 | or, more generally |
| 1848 | IPv6Address(int(IPv6Address('2001:db8::'))) == |
| 1849 | IPv6Address('2001:db8::') |
| 1850 | |
| 1851 | Raises: |
| 1852 | AddressValueError: If address isn't a valid IPv6 address. |
| 1853 | |
| 1854 | """ |
| 1855 | _BaseAddress.__init__(self, address) |
| 1856 | _BaseV6.__init__(self, address) |
| 1857 | |
| 1858 | # Efficient constructor from integer. |
| 1859 | if isinstance(address, int): |
Nick Coghlan | 297b143 | 2012-07-08 17:11:04 +1000 | [diff] [blame] | 1860 | self._check_int_address(address) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1861 | self._ip = address |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1862 | return |
| 1863 | |
| 1864 | # Constructing from a packed address |
Nick Coghlan | 5cf896f | 2012-07-07 01:43:31 +1000 | [diff] [blame] | 1865 | if isinstance(address, bytes): |
Nick Coghlan | 297b143 | 2012-07-08 17:11:04 +1000 | [diff] [blame] | 1866 | self._check_packed_address(address, 16) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1867 | tmp = struct.unpack('!QQ', address) |
| 1868 | self._ip = (tmp[0] << 64) | tmp[1] |
| 1869 | return |
| 1870 | |
| 1871 | # Assume input argument to be string or any object representation |
| 1872 | # which converts into a formatted IP string. |
| 1873 | addr_str = str(address) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1874 | self._ip = self._ip_int_from_string(addr_str) |
| 1875 | |
Hynek Schlawack | 91c5a34 | 2012-06-05 11:55:58 +0200 | [diff] [blame] | 1876 | @property |
| 1877 | def packed(self): |
| 1878 | """The binary representation of this address.""" |
| 1879 | return v6_int_to_packed(self._ip) |
| 1880 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1881 | |
| 1882 | class IPv6Interface(IPv6Address): |
| 1883 | |
| 1884 | def __init__(self, address): |
| 1885 | if isinstance(address, (bytes, int)): |
| 1886 | IPv6Address.__init__(self, address) |
| 1887 | self.network = IPv6Network(self._ip) |
| 1888 | self._prefixlen = self._max_prefixlen |
| 1889 | return |
| 1890 | |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 1891 | addr = _split_optional_netmask(address) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1892 | IPv6Address.__init__(self, addr[0]) |
| 1893 | self.network = IPv6Network(address, strict=False) |
| 1894 | self.netmask = self.network.netmask |
| 1895 | self._prefixlen = self.network._prefixlen |
| 1896 | self.hostmask = self.network.hostmask |
| 1897 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1898 | def __str__(self): |
| 1899 | return '%s/%d' % (self._string_from_ip_int(self._ip), |
| 1900 | self.network.prefixlen) |
| 1901 | |
| 1902 | def __eq__(self, other): |
Nick Coghlan | 3008ec0 | 2012-07-08 00:45:33 +1000 | [diff] [blame] | 1903 | address_equal = IPv6Address.__eq__(self, other) |
| 1904 | if not address_equal or address_equal is NotImplemented: |
| 1905 | return address_equal |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1906 | try: |
Nick Coghlan | 3008ec0 | 2012-07-08 00:45:33 +1000 | [diff] [blame] | 1907 | return self.network == other.network |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1908 | except AttributeError: |
Nick Coghlan | 3008ec0 | 2012-07-08 00:45:33 +1000 | [diff] [blame] | 1909 | # An interface with an associated network is NOT the |
| 1910 | # same as an unassociated address. That's why the hash |
| 1911 | # takes the extra info into account. |
| 1912 | return False |
| 1913 | |
| 1914 | def __lt__(self, other): |
| 1915 | address_less = IPv6Address.__lt__(self, other) |
| 1916 | if address_less is NotImplemented: |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1917 | return NotImplemented |
Nick Coghlan | 3008ec0 | 2012-07-08 00:45:33 +1000 | [diff] [blame] | 1918 | try: |
| 1919 | return self.network < other.network |
| 1920 | except AttributeError: |
| 1921 | # We *do* allow addresses and interfaces to be sorted. The |
| 1922 | # unassociated address is considered less than all interfaces. |
| 1923 | return False |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1924 | |
| 1925 | def __hash__(self): |
| 1926 | return self._ip ^ self._prefixlen ^ int(self.network.network_address) |
| 1927 | |
| 1928 | @property |
| 1929 | def prefixlen(self): |
| 1930 | return self._prefixlen |
Hynek Schlawack | 072b1e1 | 2012-05-26 12:04:56 +0200 | [diff] [blame] | 1931 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1932 | @property |
| 1933 | def ip(self): |
| 1934 | return IPv6Address(self._ip) |
| 1935 | |
| 1936 | @property |
| 1937 | def with_prefixlen(self): |
| 1938 | return self |
| 1939 | |
| 1940 | @property |
| 1941 | def with_netmask(self): |
| 1942 | return self.with_prefixlen |
Hynek Schlawack | 072b1e1 | 2012-05-26 12:04:56 +0200 | [diff] [blame] | 1943 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1944 | @property |
| 1945 | def with_hostmask(self): |
| 1946 | return '%s/%s' % (self._string_from_ip_int(self._ip), |
| 1947 | self.hostmask) |
| 1948 | |
| 1949 | |
| 1950 | class IPv6Network(_BaseV6, _BaseNetwork): |
| 1951 | |
| 1952 | """This class represents and manipulates 128-bit IPv6 networks. |
| 1953 | |
| 1954 | Attributes: [examples for IPv6('2001:db8::1000/124')] |
| 1955 | .network_address: IPv6Address('2001:db8::1000') |
| 1956 | .hostmask: IPv6Address('::f') |
| 1957 | .broadcast_address: IPv6Address('2001:db8::100f') |
| 1958 | .netmask: IPv6Address('ffff:ffff:ffff:ffff:ffff:ffff:ffff:fff0') |
| 1959 | .prefixlen: 124 |
| 1960 | |
| 1961 | """ |
| 1962 | |
Nick Coghlan | 51c3067 | 2012-05-27 00:25:58 +1000 | [diff] [blame] | 1963 | # Class to use when creating address objects |
Nick Coghlan | 51c3067 | 2012-05-27 00:25:58 +1000 | [diff] [blame] | 1964 | _address_class = IPv6Address |
| 1965 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1966 | def __init__(self, address, strict=True): |
| 1967 | """Instantiate a new IPv6 Network object. |
| 1968 | |
| 1969 | Args: |
Hynek Schlawack | 072b1e1 | 2012-05-26 12:04:56 +0200 | [diff] [blame] | 1970 | address: A string or integer representing the IPv6 network or the |
| 1971 | IP and prefix/netmask. |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 1972 | '2001:db8::/128' |
| 1973 | '2001:db8:0000:0000:0000:0000:0000:0000/128' |
| 1974 | '2001:db8::' |
| 1975 | are all functionally the same in IPv6. That is to say, |
| 1976 | failing to provide a subnetmask will create an object with |
| 1977 | a mask of /128. |
| 1978 | |
| 1979 | Additionally, an integer can be passed, so |
| 1980 | IPv6Network('2001:db8::') == |
| 1981 | IPv6Network(42540766411282592856903984951653826560) |
| 1982 | or, more generally |
| 1983 | IPv6Network(int(IPv6Network('2001:db8::'))) == |
| 1984 | IPv6Network('2001:db8::') |
| 1985 | |
| 1986 | strict: A boolean. If true, ensure that we have been passed |
| 1987 | A true network address, eg, 2001:db8::1000/124 and not an |
| 1988 | IP address on a network, eg, 2001:db8::1/124. |
| 1989 | |
| 1990 | Raises: |
| 1991 | AddressValueError: If address isn't a valid IPv6 address. |
| 1992 | NetmaskValueError: If the netmask isn't valid for |
| 1993 | an IPv6 address. |
| 1994 | ValueError: If strict was True and a network address was not |
| 1995 | supplied. |
| 1996 | |
| 1997 | """ |
| 1998 | _BaseV6.__init__(self, address) |
| 1999 | _BaseNetwork.__init__(self, address) |
| 2000 | |
| 2001 | # Efficient constructor from integer. |
| 2002 | if isinstance(address, int): |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 2003 | self.network_address = IPv6Address(address) |
| 2004 | self._prefixlen = self._max_prefixlen |
| 2005 | self.netmask = IPv6Address(self._ALL_ONES) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 2006 | return |
| 2007 | |
| 2008 | # Constructing from a packed address |
Nick Coghlan | 5cf896f | 2012-07-07 01:43:31 +1000 | [diff] [blame] | 2009 | if isinstance(address, bytes): |
Nick Coghlan | 297b143 | 2012-07-08 17:11:04 +1000 | [diff] [blame] | 2010 | self.network_address = IPv6Address(address) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 2011 | self._prefixlen = self._max_prefixlen |
| 2012 | self.netmask = IPv6Address(self._ALL_ONES) |
Hynek Schlawack | ed36b2e | 2012-06-08 15:21:21 +0200 | [diff] [blame] | 2013 | return |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 2014 | |
| 2015 | # Assume input argument to be string or any object representation |
| 2016 | # which converts into a formatted IP prefix string. |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 2017 | addr = _split_optional_netmask(address) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 2018 | |
| 2019 | self.network_address = IPv6Address(self._ip_int_from_string(addr[0])) |
| 2020 | |
| 2021 | if len(addr) == 2: |
| 2022 | if self._is_valid_netmask(addr[1]): |
| 2023 | self._prefixlen = int(addr[1]) |
| 2024 | else: |
Nick Coghlan | 36f8dcd | 2012-07-07 19:23:53 +1000 | [diff] [blame] | 2025 | raise NetmaskValueError('%r is not a valid netmask' |
| 2026 | % addr[1]) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 2027 | else: |
| 2028 | self._prefixlen = self._max_prefixlen |
| 2029 | |
| 2030 | self.netmask = IPv6Address(self._ip_int_from_prefix(self._prefixlen)) |
| 2031 | if strict: |
| 2032 | if (IPv6Address(int(self.network_address) & int(self.netmask)) != |
| 2033 | self.network_address): |
Nick Coghlan | 912238e | 2012-07-07 13:34:50 +1000 | [diff] [blame] | 2034 | raise ValueError('%s has host bits set' % self) |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 2035 | self.network_address = IPv6Address(int(self.network_address) & |
| 2036 | int(self.netmask)) |
| 2037 | |
| 2038 | if self._prefixlen == (self._max_prefixlen - 1): |
| 2039 | self.hosts = self.__iter__ |
| 2040 | |
Nick Coghlan | dc9b255 | 2012-05-20 21:01:57 +1000 | [diff] [blame] | 2041 | def _is_valid_netmask(self, prefixlen): |
| 2042 | """Verify that the netmask/prefixlen is valid. |
| 2043 | |
| 2044 | Args: |
| 2045 | prefixlen: A string, the netmask in prefix length format. |
| 2046 | |
| 2047 | Returns: |
| 2048 | A boolean, True if the prefix represents a valid IPv6 |
| 2049 | netmask. |
| 2050 | |
| 2051 | """ |
| 2052 | try: |
| 2053 | prefixlen = int(prefixlen) |
| 2054 | except ValueError: |
| 2055 | return False |
| 2056 | return 0 <= prefixlen <= self._max_prefixlen |