icvpn/scripts/check

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#!/usr/bin/env python
import sys
import os
import socket
import subprocess
import nmap
from optparse import OptionParser
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ip4, ip6 = 0, 0
ANSI_COLOR_ERR = "\x1b[31m"
ANSI_COLOR_WARN = "\x1b[33m"
ANSI_COLOR_OK = "\x1b[32m"
ANSI_COLOR_RESET = "\x1b[0m"
def error(*arg):
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print(ANSI_COLOR_ERR, *arg, file=sys.stderr,
end='%s\n' % ANSI_COLOR_RESET)
def warn(*arg):
print(ANSI_COLOR_WARN, *arg, file=sys.stderr,
end='%s\n' % ANSI_COLOR_RESET)
def ok(*arg):
print(ANSI_COLOR_OK, *arg, file=sys.stderr,
end='%s\n' % ANSI_COLOR_RESET)
def check_host_lookup(hostname, port):
try:
return socket.getaddrinfo(hostname, port)
except Exception:
error("DNS Lookup for {hostname} failed".format(hostname=hostname))
return []
def check_icmp_reachability(gai_record):
host = gai_record[4][0]
family = gai_record[0]
if family is socket.AddressFamily.AF_INET:
process_name = 'ping'
else:
process_name = 'ping6'
child = subprocess.Popen([process_name, host, '-c', '1', '-W', '5'],
stdout=subprocess.PIPE)
child.communicate()
if child.returncode:
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error("{host} is icmp unreachable".format(host=host))
return True if child.returncode == 0 else False
def check_udp_reachability(gai_record):
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global ip4, ip6
host, port = gai_record[4][:2]
family = gai_record[0]
if family is socket.AddressFamily.AF_INET:
arguments = '-sU -PN'
else:
arguments = '-sU -PN -6'
scanner = nmap.PortScanner()
result = scanner.scan(host, str(port), arguments) # -sU requires root
state = result['scan'][host]['udp'][port]['state']
if state == 'closed':
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error("{host} port {port}/udp is {state}"
.format(host=host, port=port, state=state))
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else:
ok("{host} port {port}/udp is {state}"
.format(host=host, port=port, state=state))
if family is socket.AddressFamily.AF_INET:
ip4 += 1
else:
ip6 += 1
return False if state == 'closed' else True
def get_hosts_data(srcdir):
for fname in sorted(list(set(os.listdir(srcdir)))):
if fname.startswith("."):
continue
fpath = os.path.join(srcdir, fname)
if os.path.isfile(fpath):
with open(fpath) as f:
ignore_key = False
addresses = []
port = 655 # tinc default port
for line in f.readlines():
if '-----BEGIN RSA PUBLIC KEY-----' in line:
ignore_key = True
elif '-----END RSA PUBLIC KEY-----' in line:
ignore_key = False
if line.startswith("#") or ignore_key:
continue
chunks = line.split("=")
if len(chunks) == 2:
(k, v) = (x.strip().lower() for x in chunks)
if k == "port":
try:
port = int(v)
except ValueError:
error("non-integer default port given")
elif k == "address":
if " " in v:
parts = v.split(' ')
if len(parts) != 2:
error("unknown address format")
try:
int(parts[1])
addresses.append(parts)
except ValueError:
error("non-integer port given")
else:
addresses.append((v, None))
elif k in ('ecdsapublickey'):
continue
else:
error("unknown key {key} with value {val}"
.format(key=k, val=v))
# set explicit port for address/port pairs
for i, addr in enumerate(addresses):
if addr[1] is None:
item = (addr[0], port)
addresses[i] = item
yield(dict(community=fname, addresses=addresses))
def do_checks(srcdir):
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global ip4, ip6
errcnt = 0
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warncnt = 0
for host in get_hosts_data(srcdir):
print("Checking {community}".format(community=host['community']))
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if not host['addresses']:
warn("no addresses specified")
warncnt += 1
for address in host['addresses']:
host, port = address
# dns lookup
records = check_host_lookup(host, port)
if not records:
errcnt += 1
else:
for record in records:
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if record[1] is not socket.SOCK_DGRAM:
# vpn connections are udp based, so skip
# everything else
continue
if not check_icmp_reachability(record):
errcnt += 1
else:
port_state = check_udp_reachability(record)
if not port_state:
errcnt += 1
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print("\nfound {}/{} working ipv4/ipv6 peers".format(ip4, ip6))
error("{} errors".format(errcnt))
warn("{} warnings".format(warncnt))
return 0 if errcnt == 0 else 1
if __name__ == "__main__":
parser = OptionParser()
parser.add_option("-s", "--sourcedir", dest="src",
help="Location of tinc host files. Default: ../hosts",
metavar="DIR",
default="../hosts/")
(options, args) = parser.parse_args()
ret = do_checks(options.src)
sys.exit(ret)