/
net.py
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/
net.py
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from __future__ import absolute_import
from __future__ import division
import ctypes
import ctypes.util
import socket
from pwnlib.util.packing import p16
from pwnlib.util.packing import p32
from pwnlib.util.packing import pack
__all__ = ['getifaddrs', 'interfaces', 'interfaces4', 'interfaces6', 'sockaddr']
# /usr/src/linux-headers-3.12-1-common/include/uapi/linux/socket.h
sa_family_t = ctypes.c_ushort
# /usr/src/linux-headers-3.12-1-common/include/linux/socket.h
class struct_sockaddr(ctypes.Structure):
_fields_ = [
('sa_family', sa_family_t) ,
('sa_data' , ctypes.c_char * 14),
]
# /usr/src/linux-headers-3.12-1-common/include/uapi/linux/in.h
struct_in_addr = ctypes.c_uint8 * 4
class struct_sockaddr_in(ctypes.Structure):
_fields_ = [
('sin_family', sa_family_t) ,
('sin_port' , ctypes.c_uint16),
('sin_addr' , struct_in_addr) ,
]
# /usr/src/linux-headers-3.12-1-common/include/uapi/linux/in6.h
struct_in6_addr = ctypes.c_uint8 * 16
class struct_sockaddr_in6(ctypes.Structure):
_fields_ = [
('sin6_family' , ctypes.c_ushort),
('sin6_port' , ctypes.c_uint16),
('sin6_flowinfo', ctypes.c_uint32),
('sin6_addr' , struct_in6_addr),
('sin6_scope_id', ctypes.c_uint32),
]
# /usr/include/ifaddrs.h
class union_ifa_ifu(ctypes.Union):
_fields_ = [
('ifu_broadaddr', ctypes.POINTER(struct_sockaddr)),
('ifu_dstaddr' , ctypes.POINTER(struct_sockaddr)),
]
class struct_ifaddrs(ctypes.Structure):
pass # recursively defined
struct_ifaddrs._fields_ = [
('ifa_next' , ctypes.POINTER(struct_ifaddrs)) ,
('ifa_name' , ctypes.c_char_p) ,
('ifa_flags' , ctypes.c_uint) ,
('ifa_addr' , ctypes.POINTER(struct_sockaddr)),
('ifa_netmask', ctypes.POINTER(struct_sockaddr)),
('ifa_ifu' , union_ifa_ifu) ,
('ifa_data' , ctypes.c_void_p) ,
]
AddressFamily = getattr(socket, 'AddressFamily', int)
def sockaddr_fixup(saptr):
family = AddressFamily(saptr.contents.sa_family)
addr = {}
if family == socket.AF_INET:
sa = ctypes.cast(saptr, ctypes.POINTER(struct_sockaddr_in)).contents
addr['port'] = socket.ntohs(sa.sin_port)
addr['addr'] = socket.inet_ntop(family, sa.sin_addr)
elif family == socket.AF_INET6:
sa = ctypes.cast(saptr, ctypes.POINTER(struct_sockaddr_in6)).contents
addr['port'] = socket.ntohs(sa.sin6_port)
addr['flowinfo'] = socket.ntohl(sa.sin6_flowinfo)
addr['addr'] = socket.inet_ntop(family, sa.sin6_addr)
addr['scope_id'] = sa.sin6_scope_id
return family, addr
def getifaddrs():
"""getifaddrs() -> dict list
A wrapper for libc's ``getifaddrs``.
Arguments:
None
Returns:
list of dictionaries each representing a `struct ifaddrs`. The
dictionaries have the fields `name`, `flags`, `family`, `addr` and
`netmask`. Refer to `getifaddrs(3)` for details. The fields `addr` and
`netmask` are themselves dictionaries. Their structure depend on
`family`. If `family` is not :const:`socket.AF_INET` or
:const:`socket.AF_INET6` they will be empty.
"""
libc = ctypes.CDLL(ctypes.util.find_library('c'))
getifaddrs = libc.getifaddrs
getifaddrs.restype = ctypes.c_int
getifaddrs.argtpes = [ctypes.POINTER(ctypes.POINTER(struct_ifaddrs))]
freeifaddrs = libc.freeifaddrs
freeifaddrs.restype = None
freeifaddrs.argtypes = [ctypes.POINTER(struct_ifaddrs)]
ifaptr = ctypes.POINTER(struct_ifaddrs)()
result = getifaddrs(ctypes.pointer(ifaptr))
if result == -1:
raise OSError(ctypes.get_errno())
del result
try:
ifas = []
while ifaptr:
ifac = ifaptr.contents
ifa = {'name' : ifac.ifa_name,
'flags': ifac.ifa_flags,
}
if ifac.ifa_addr:
ifa['family'], ifa['addr'] = sockaddr_fixup(ifac.ifa_addr)
else:
ifa['family'], ifa['addr'] = None, None
if ifac.ifa_netmask:
_, ifa['netmask'] = sockaddr_fixup(ifac.ifa_netmask)
else:
ifa['network'] = None
ifas.append(ifa)
ifaptr = ifac.ifa_next
return ifas
finally:
freeifaddrs(ifaptr)
def interfaces(all = False):
"""interfaces(all = False) -> dict
Arguments:
all (bool): Whether to include interfaces with not associated address.
Default: :const:`False`.
Returns:
A dictionary mapping each of the hosts interfaces to a list of it's
addresses. Each entry in the list is a tuple ``(family, addr)``, and
`family` is either :const:`socket.AF_INET` or :const:`socket.AF_INET6`.
"""
out = {}
for ifa in getifaddrs():
name = ifa['name']
if name not in out:
out[name] = []
if not ifa['addr']:
continue
family = ifa['family']
addr = ifa['addr']['addr']
out[name].append((family, addr))
if not all:
out = {k: v for k, v in out.items() if v}
return out
def interfaces4(all = False):
"""interfaces4(all = False) -> dict
As :func:`interfaces` but only includes IPv4 addresses and the lists in the
dictionary only contains the addresses not the family.
Arguments:
all (bool): Whether to include interfaces with not associated address.
Default: :const:`False`.
Returns:
A dictionary mapping each of the hosts interfaces to a list of it's
IPv4 addresses.
Examples:
>>> interfaces4(all=True) # doctest: +ELLIPSIS
{...'127.0.0.1'...}
"""
out = {}
for name, addrs in interfaces(all = all).items():
addrs = [addr for fam, addr in addrs if fam == socket.AF_INET]
if addrs or all:
out[name] = addrs
return out
def interfaces6(all = False):
"""interfaces6(all = False) -> dict
As :func:`interfaces` but only includes IPv6 addresses and the lists in the
dictionary only contains the addresses not the family.
Arguments:
all (bool): Whether to include interfaces with not associated address.
Default: :const:`False`.
Returns:
A dictionary mapping each of the hosts interfaces to a list of it's
IPv6 addresses.
Examples:
>>> interfaces6() # doctest: +ELLIPSIS
{...'::1'...}
"""
out = {}
for name, addrs in interfaces(all = all).items():
addrs = [addr for fam, addr in addrs if fam == socket.AF_INET6]
if addrs or all:
out[name] = addrs
return out
def sockaddr(host, port, network = 'ipv4'):
"""sockaddr(host, port, network = 'ipv4') -> (data, length, family)
Creates a sockaddr_in or sockaddr_in6 memory buffer for use in shellcode.
Arguments:
host (str): Either an IP address or a hostname to be looked up.
port (int): TCP/UDP port.
network (str): Either 'ipv4' or 'ipv6'.
Returns:
A tuple containing the sockaddr buffer, length, and the address family.
"""
address_family = {'ipv4':socket.AF_INET,'ipv6':socket.AF_INET6}[network]
for family, _, _, _, ip in socket.getaddrinfo(host, None, address_family):
ip = ip[0]
if family == address_family:
break
else:
log.error("Could not find %s address for %r" % (network, host))
info = socket.getaddrinfo(host, None, address_family)
host = socket.inet_pton(address_family, ip)
sockaddr = p16(address_family)
sockaddr += pack(port, word_size = 16, endianness = 'big') #Port should be big endian = network byte order
length = 0
if network == 'ipv4':
sockaddr += host
length = 16 # Save ten bytes by skipping two 'push 0'
else:
sockaddr += p32(0xffffffff) # Save three bytes 'push -1' vs 'push 0'
sockaddr += host
length = len(sockaddr) + 4 # Save five bytes 'push 0'
return (sockaddr, length, getattr(address_family, "name", address_family))
def sock_match(local, remote, fam=socket.AF_UNSPEC, typ=0):
"""
Given two addresses, returns a function comparing address pairs from
psutil library against these two. Useful for filtering done in
:func:`pwnlib.util.proc.pidof`.
"""
def sockinfos(addr, f, t):
if not addr:
return set()
if f not in (socket.AF_UNSPEC, socket.AF_INET, socket.AF_INET6):
return {addr}
infos = set(socket.getaddrinfo(addr[0], addr[1], f, t))
# handle mixed IPv4-to-IPv6 and the other way round connections
for f, t, proto, _canonname, sockaddr in tuple(infos):
if f == socket.AF_INET and t != socket.SOCK_RAW:
infos |= set(socket.getaddrinfo(sockaddr[0], sockaddr[1], socket.AF_INET6, t, proto, socket.AI_V4MAPPED))
return infos
if local is not None:
local = sockinfos(local, fam, typ)
remote = sockinfos(remote, fam, typ)
def match(c):
laddrs = sockinfos(c.laddr, c.family, c.type)
raddrs = sockinfos(c.raddr, c.family, c.type)
if not (raddrs & remote):
return False
if local is None:
return True
return bool(laddrs & local)
return match