1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298
|
import time
import socket
import re
import select
import errno
import os
import sys
import platform
import subprocess as ssubprocess
import sshuttle.helpers as helpers
from sshuttle.helpers import log, debug1, debug2, debug3
POLL_TIME = 60 * 15
NETSTAT_POLL_TIME = 30
CACHEFILE = os.path.expanduser('~/.sshuttle.hosts')
_nmb_ok = True
_smb_ok = True
hostnames = {}
queue = {}
try:
null = open('/dev/null', 'wb')
except IOError:
_, e = sys.exc_info()[:2]
log('warning: %s\n' % e)
null = os.popen("sh -c 'while read x; do :; done'", 'wb', 4096)
def _is_ip(s):
return re.match(r'\d+\.\d+\.\d+\.\d+$', s)
def write_host_cache():
tmpname = '%s.%d.tmp' % (CACHEFILE, os.getpid())
try:
f = open(tmpname, 'wb')
for name, ip in sorted(hostnames.items()):
f.write(('%s,%s\n' % (name, ip)).encode("ASCII"))
f.close()
os.chmod(tmpname, 384) # 600 in octal, 'rw-------'
os.rename(tmpname, CACHEFILE)
finally:
try:
os.unlink(tmpname)
except:
pass
def read_host_cache():
try:
f = open(CACHEFILE)
except IOError:
_, e = sys.exc_info()[:2]
if e.errno == errno.ENOENT:
return
else:
raise
for line in f:
words = line.strip().split(',')
if len(words) == 2:
(name, ip) = words
name = re.sub(r'[^-\w]', '-', name).strip()
ip = re.sub(r'[^0-9.]', '', ip).strip()
if name and ip:
found_host(name, ip)
def found_host(hostname, ip):
hostname = re.sub(r'\..*', '', hostname)
hostname = re.sub(r'[^-\w]', '_', hostname)
if (ip.startswith('127.') or ip.startswith('255.') or
hostname == 'localhost'):
return
oldip = hostnames.get(hostname)
if oldip != ip:
hostnames[hostname] = ip
debug1('Found: %s: %s\n' % (hostname, ip))
sys.stdout.write('%s,%s\n' % (hostname, ip))
write_host_cache()
def _check_etc_hosts():
debug2(' > hosts\n')
for line in open('/etc/hosts'):
line = re.sub(r'#.*', '', line)
words = line.strip().split()
if not words:
continue
ip = words[0]
names = words[1:]
if _is_ip(ip):
debug3('< %s %r\n' % (ip, names))
for n in names:
check_host(n)
found_host(n, ip)
def _check_revdns(ip):
debug2(' > rev: %s\n' % ip)
try:
r = socket.gethostbyaddr(ip)
debug3('< %s\n' % r[0])
check_host(r[0])
found_host(r[0], ip)
except socket.herror:
pass
def _check_dns(hostname):
debug2(' > dns: %s\n' % hostname)
try:
ip = socket.gethostbyname(hostname)
debug3('< %s\n' % ip)
check_host(ip)
found_host(hostname, ip)
except socket.gaierror:
pass
def _check_netstat():
debug2(' > netstat\n')
argv = ['netstat', '-n']
try:
p = ssubprocess.Popen(argv, stdout=ssubprocess.PIPE, stderr=null)
content = p.stdout.read().decode("ASCII")
p.wait()
except OSError:
_, e = sys.exc_info()[:2]
log('%r failed: %r\n' % (argv, e))
return
for ip in re.findall(r'\d+\.\d+\.\d+\.\d+', content):
debug3('< %s\n' % ip)
check_host(ip)
def _check_smb(hostname):
return
global _smb_ok
if not _smb_ok:
return
argv = ['smbclient', '-U', '%', '-L', hostname]
debug2(' > smb: %s\n' % hostname)
try:
p = ssubprocess.Popen(argv, stdout=ssubprocess.PIPE, stderr=null)
lines = p.stdout.readlines()
p.wait()
except OSError:
_, e = sys.exc_info()[:2]
log('%r failed: %r\n' % (argv, e))
_smb_ok = False
return
lines.reverse()
# junk at top
while lines:
line = lines.pop().strip()
if re.match(r'Server\s+', line):
break
# server list section:
# Server Comment
# ------ -------
while lines:
line = lines.pop().strip()
if not line or re.match(r'-+\s+-+', line):
continue
if re.match(r'Workgroup\s+Master', line):
break
words = line.split()
hostname = words[0].lower()
debug3('< %s\n' % hostname)
check_host(hostname)
# workgroup list section:
# Workgroup Master
# --------- ------
while lines:
line = lines.pop().strip()
if re.match(r'-+\s+', line):
continue
if not line:
break
words = line.split()
(workgroup, hostname) = (words[0].lower(), words[1].lower())
debug3('< group(%s) -> %s\n' % (workgroup, hostname))
check_host(hostname)
check_workgroup(workgroup)
if lines:
assert(0)
def _check_nmb(hostname, is_workgroup, is_master):
return
global _nmb_ok
if not _nmb_ok:
return
argv = ['nmblookup'] + ['-M'] * is_master + ['--', hostname]
debug2(' > n%d%d: %s\n' % (is_workgroup, is_master, hostname))
try:
p = ssubprocess.Popen(argv, stdout=ssubprocess.PIPE, stderr=null)
lines = p.stdout.readlines()
rv = p.wait()
except OSError:
_, e = sys.exc_info()[:2]
log('%r failed: %r\n' % (argv, e))
_nmb_ok = False
return
if rv:
log('%r returned %d\n' % (argv, rv))
return
for line in lines:
m = re.match(r'(\d+\.\d+\.\d+\.\d+) (\w+)<\w\w>\n', line)
if m:
g = m.groups()
(ip, name) = (g[0], g[1].lower())
debug3('< %s -> %s\n' % (name, ip))
if is_workgroup:
_enqueue(_check_smb, ip)
else:
found_host(name, ip)
check_host(name)
def check_host(hostname):
if _is_ip(hostname):
_enqueue(_check_revdns, hostname)
else:
_enqueue(_check_dns, hostname)
_enqueue(_check_smb, hostname)
_enqueue(_check_nmb, hostname, False, False)
def check_workgroup(hostname):
_enqueue(_check_nmb, hostname, True, False)
_enqueue(_check_nmb, hostname, True, True)
def _enqueue(op, *args):
t = (op, args)
if queue.get(t) is None:
queue[t] = 0
def _stdin_still_ok(timeout):
r, w, x = select.select([sys.stdin.fileno()], [], [], timeout)
if r:
b = os.read(sys.stdin.fileno(), 4096)
if not b:
return False
return True
def hw_main(seed_hosts, auto_hosts):
if helpers.verbose >= 2:
helpers.logprefix = 'HH: '
else:
helpers.logprefix = 'hostwatch: '
debug1('Starting hostwatch with Python version %s\n'
% platform.python_version())
for h in seed_hosts:
check_host(h)
if auto_hosts:
read_host_cache()
_enqueue(_check_etc_hosts)
_enqueue(_check_netstat)
check_host('localhost')
check_host(socket.gethostname())
check_workgroup('workgroup')
check_workgroup('-')
while 1:
now = time.time()
for t, last_polled in list(queue.items()):
(op, args) = t
if not _stdin_still_ok(0):
break
maxtime = POLL_TIME
if op == _check_netstat:
maxtime = NETSTAT_POLL_TIME
if now - last_polled > maxtime:
queue[t] = time.time()
op(*args)
try:
sys.stdout.flush()
except IOError:
break
# FIXME: use a smarter timeout based on oldest last_polled
if not _stdin_still_ok(1):
break
|