Added command-line option to modify connection/read timeout.

ssh-audit.py

@@ -68,6 +68,7 @@ def usage(err=None):
 	uout.info('   -n,  --no-colors        disable colors')
 	uout.info('   -v,  --verbose          verbose output')
 	uout.info('   -l,  --level=<level>    minimum output level (info|warn|fail)')
+	uout.info('   -t,  --timeout=<secs>   timeout (in seconds) for connection and reading\n                           (default: 5)')
 	uout.sep()
 	sys.exit(1)
 
@@ -87,7 +88,8 @@ class AuditConf(object):
 		self.ipvo = ()  # type: Sequence[int]
 		self.ipv4 = False
 		self.ipv6 = False
-	
+		self.timeout = 5.0
+
 	def __setattr__(self, name, value):
 		# type: (str, Union[str, int, bool, Sequence[int]]) -> None
 		valid = False
@@ -124,6 +126,11 @@ class AuditConf(object):
 			valid = True
 		elif name == 'host':
 			valid = True
+		elif name == 'timeout':
+			value = utils.parse_float(value)
+			if value == -1.0:
+				raise ValueError('invalid timeout: {0}'.format(value))
+			valid = True
 		if valid:
 			object.__setattr__(self, name, value)
 	
@@ -133,9 +140,9 @@ class AuditConf(object):
 		# pylint: disable=too-many-branches
 		aconf = cls()
 		try:
-			sopts = 'h1246p:bnvl:'
+			sopts = 'h1246p:bnvl:t:'
 			lopts = ['help', 'ssh1', 'ssh2', 'ipv4', 'ipv6', 'port',
-			         'batch', 'no-colors', 'verbose', 'level=']
+			         'batch', 'no-colors', 'verbose', 'level=', 'timeout=']
 			opts, args = getopt.getopt(args, sopts, lopts)
 		except getopt.GetoptError as err:
 			usage_cb(str(err))
@@ -165,6 +172,8 @@ class AuditConf(object):
 				if a not in ('info', 'warn', 'fail'):
 					usage_cb('level {0} is not valid'.format(a))
 				aconf.level = a
+			elif o in ('-t', '--timeout'):
+				aconf.timeout = float(a)
 		if len(args) == 0:
 			usage_cb()
 		if oport is not None:
@@ -1586,16 +1595,15 @@ class SSH(object):  # pylint: disable=too-few-public-methods
 				out.fail('[exception] {0}'.format(e))
 				sys.exit(1)
 		
-		def connect(self, ipvo=(), cto=3.0, rto=5.0):
+		def connect(self, ipvo, timeout):
-			# type: (Sequence[int], float, float) -> None
+			# type: (Sequence[int], float) -> None
 			err = None
 			for af, addr in self._resolve(ipvo):
 				s = None
 				try:
 					s = socket.socket(af, socket.SOCK_STREAM)
-					s.settimeout(cto)
+					s.settimeout(timeout)
 					s.connect(addr)
-					s.settimeout(rto)
 					self.__sock = s
 					return
 				except socket.error as e:
@@ -2159,6 +2167,14 @@ class Utils(object):
 		except:  # pylint: disable=bare-except
 			return 0
 
+	@staticmethod
+	def parse_float(v):
+		# type: (Any) -> float
+		try:
+			return float(v)
+		except:  # pylint: disable=bare-except
+			return -1.0
+
 
 def audit(aconf, sshv=None):
 	# type: (AuditConf, Optional[int]) -> None
@@ -2167,7 +2183,7 @@ def audit(aconf, sshv=None):
 	out.level = aconf.level
 	out.use_colors = aconf.colors
 	s = SSH.Socket(aconf.host, aconf.port)
-	s.connect(aconf.ipvo)
+	s.connect(aconf.ipvo, aconf.timeout)
 	if sshv is None:
 		sshv = 2 if aconf.ssh2 else 1
 	err = None