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#!/usr/bin/env python3
# Copyright (c) 2014-2018 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Linux network utilities.
Roughly based on http://voorloopnul.com/blog/a-python-netstat-in-less-than-100-lines-of-code/ by Ricardo Pascal
"""
import sys
import socket
import struct
import array
import os
from binascii import unhexlify
# STATE_ESTABLISHED = '01'
# STATE_SYN_SENT = '02'
# STATE_SYN_RECV = '03'
# STATE_FIN_WAIT1 = '04'
# STATE_FIN_WAIT2 = '05'
# STATE_TIME_WAIT = '06'
# STATE_CLOSE = '07'
# STATE_CLOSE_WAIT = '08'
# STATE_LAST_ACK = '09'
STATE_LISTEN = '0A'
# STATE_CLOSING = '0B'
def get_socket_inodes(pid):
'''
Get list of socket inodes for process pid.
'''
base = '/proc/%i/fd' % pid
inodes = []
for item in os.listdir(base):
target = os.readlink(os.path.join(base, item))
if target.startswith('socket:'):
inodes.append(int(target[8:-1]))
return inodes
def _remove_empty(array):
return [x for x in array if x !='']
def _convert_ip_port(array):
host,port = array.split(':')
# convert host from mangled-per-four-bytes form as used by kernel
host = unhexlify(host)
host_out = ''
for x in range(0, len(host) // 4):
(val,) = struct.unpack('=I', host[x*4:(x+1)*4])
host_out += '%08x' % val
return host_out,int(port,16)
def netstat(typ='tcp'):
'''
Function to return a list with status of tcp connections at linux systems
To get pid of all network process running on system, you must run this script
as superuser
'''
with open('/proc/net/'+typ,'r',encoding='utf8') as f:
content = f.readlines()
content.pop(0)
result = []
for line in content:
line_array = _remove_empty(line.split(' ')) # Split lines and remove empty spaces.
tcp_id = line_array[0]
l_addr = _convert_ip_port(line_array[1])
r_addr = _convert_ip_port(line_array[2])
state = line_array[3]
inode = int(line_array[9]) # Need the inode to match with process pid.
nline = [tcp_id, l_addr, r_addr, state, inode]
result.append(nline)
return result
def get_bind_addrs(pid):
'''
Get bind addresses as (host,port) tuples for process pid.
'''
inodes = get_socket_inodes(pid)
bind_addrs = []
for conn in netstat('tcp') + netstat('tcp6'):
if conn[3] == STATE_LISTEN and conn[4] in inodes:
bind_addrs.append(conn[1])
return bind_addrs
# from: http://code.activestate.com/recipes/439093/
def all_interfaces():
'''
Return all interfaces that are up
'''
import fcntl # Linux only, so only import when required
is_64bits = sys.maxsize > 2**32
struct_size = 40 if is_64bits else 32
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
max_possible = 8 # initial value
while True:
bytes = max_possible * struct_size
names = array.array('B', b'\0' * bytes)
outbytes = struct.unpack('iL', fcntl.ioctl(
s.fileno(),
0x8912, # SIOCGIFCONF
struct.pack('iL', bytes, names.buffer_info()[0])
))[0]
if outbytes == bytes:
max_possible *= 2
else:
break
namestr = names.tobytes()
return [(namestr[i:i+16].split(b'\0', 1)[0],
socket.inet_ntoa(namestr[i+20:i+24]))
for i in range(0, outbytes, struct_size)]
def addr_to_hex(addr):
'''
Convert string IPv4 or IPv6 address to binary address as returned by
get_bind_addrs.
Very naive implementation that certainly doesn't work for all IPv6 variants.
'''
if '.' in addr: # IPv4
addr = [int(x) for x in addr.split('.')]
elif ':' in addr: # IPv6
sub = [[], []] # prefix, suffix
x = 0
addr = addr.split(':')
for i,comp in enumerate(addr):
if comp == '':
if i == 0 or i == (len(addr)-1): # skip empty component at beginning or end
continue
x += 1 # :: skips to suffix
assert x < 2
else: # two bytes per component
val = int(comp, 16)
sub[x].append(val >> 8)
sub[x].append(val & 0xff)
nullbytes = 16 - len(sub[0]) - len(sub[1])
assert (x == 0 and nullbytes == 0) or (x == 1 and nullbytes > 0)
addr = sub[0] + ([0] * nullbytes) + sub[1]
else:
raise ValueError('Could not parse address %s' % addr)
return bytearray(addr).hex()
def test_ipv6_local():
'''
Check for (local) IPv6 support.
'''
import socket
# By using SOCK_DGRAM this will not actually make a connection, but it will
# fail if there is no route to IPv6 localhost.
have_ipv6 = True
try:
s = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
s.connect(('::1', 0))
except socket.error:
have_ipv6 = False
return have_ipv6
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