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Removed sys.exit from _resolve in ssh_socket.py (#187)

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Changed (and documented) _resolve so the application does not quit when a hostname cannot be resolved.

Adapted connect function to expect incoming exceptions from _resolve

This fixes issue #186
This commit is contained in:
Dani Cuesta 2023-06-20 15:21:06 +02:00 committed by GitHub
parent e99cb0b579
commit a74c3abdde
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1 changed files with 20 additions and 18 deletions
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12
src/ssh_audit/ssh_socket.py
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@ -75,12 +75,17 @@ class SSH_Socket(ReadBuf, WriteBuf):
self.client_port = None self.client_port = None
def _resolve(self) -> Iterable[Tuple[int, Tuple[Any, ...]]]: def _resolve(self) -> Iterable[Tuple[int, Tuple[Any, ...]]]:
"""Resolves a hostname into a list of IPs
Raises
------
socket.gaierror [Errno -2]
If the hostname cannot be resolved.
"""
# If __ip_version_preference has only one entry, then it means that ONLY that IP version should be used. # If __ip_version_preference has only one entry, then it means that ONLY that IP version should be used.
if len(self.__ip_version_preference) == 1: if len(self.__ip_version_preference) == 1:
family = socket.AF_INET if self.__ip_version_preference[0] == 4 else socket.AF_INET6 family = socket.AF_INET if self.__ip_version_preference[0] == 4 else socket.AF_INET6
else: else:
family = socket.AF_UNSPEC family = socket.AF_UNSPEC
try:
stype = socket.SOCK_STREAM stype = socket.SOCK_STREAM
r = socket.getaddrinfo(self.__host, self.__port, family, stype) r = socket.getaddrinfo(self.__host, self.__port, family, stype)
@ -90,9 +95,6 @@ class SSH_Socket(ReadBuf, WriteBuf):
for af, socktype, _proto, _canonname, addr in r: for af, socktype, _proto, _canonname, addr in r:
if socktype == socket.SOCK_STREAM: if socktype == socket.SOCK_STREAM:
yield af, addr yield af, addr
except socket.error as e:
self.__outputbuffer.fail('[exception] {}'.format(e)).write()
sys.exit(exitcodes.CONNECTION_ERROR)
# Listens on a server socket and accepts one connection (used for # Listens on a server socket and accepts one connection (used for
# auditing client connections). # auditing client connections).
@ -152,9 +154,9 @@ class SSH_Socket(ReadBuf, WriteBuf):
def connect(self) -> Optional[str]: def connect(self) -> Optional[str]:
'''Returns None on success, or an error string.''' '''Returns None on success, or an error string.'''
err = None err = None
for af, addr in self._resolve():
s = None s = None
try: try:
for af, addr in self._resolve():
s = socket.socket(af, socket.SOCK_STREAM) s = socket.socket(af, socket.SOCK_STREAM)
s.settimeout(self.__timeout) s.settimeout(self.__timeout)
self.__outputbuffer.d(("Connecting to %s:%d..." % ('[%s]' % addr[0] if Utils.is_ipv6_address(addr[0]) else addr[0], addr[1])), write_now=True) self.__outputbuffer.d(("Connecting to %s:%d..." % ('[%s]' % addr[0] if Utils.is_ipv6_address(addr[0]) else addr[0], addr[1])), write_now=True)