Changes methods that do not reference the instance to static methods

4 files changed, 31 insertions, 18 deletions

diff --git a/sshuttle/methods/__init__.py b/sshuttle/methods/__init__.py
index 6359d19..84a0453 100644
--- a/sshuttle/methods/__init__.py
+++ b/sshuttle/methods/__init__.py
@@ -35,7 +35,8 @@ class BaseMethod(object):
     def set_firewall(self, firewall):
         self.firewall = firewall
 
-    def get_supported_features(self):
+    @staticmethod
+    def get_supported_features():
         result = Features()
         result.ipv6 = False
         result.udp = False
@@ -43,10 +44,12 @@ class BaseMethod(object):
         result.user = False
         return result
 
-    def get_tcp_dstip(self, sock):
+    @staticmethod
+    def get_tcp_dstip(sock):
         return original_dst(sock)
 
-    def recv_udp(self, udp_listener, bufsize):
+    @staticmethod
+    def recv_udp(udp_listener, bufsize):
         debug3('Accept UDP using recvfrom.\n')
         data, srcip = udp_listener.recvfrom(bufsize)
         return (srcip, None, data)
@@ -77,7 +80,8 @@ class BaseMethod(object):
     def restore_firewall(self, port, family, udp, user):
         raise NotImplementedError()
 
-    def firewall_command(self, line):
+    @staticmethod
+    def firewall_command(line):
         return False
 
 
diff --git a/sshuttle/methods/pf.py b/sshuttle/methods/pf.py
index 2c0e575..1716e06 100644
--- a/sshuttle/methods/pf.py
+++ b/sshuttle/methods/pf.py
@@ -35,11 +35,11 @@ class Generic(object):
 
     class pf_addr(Structure):
         class _pfa(Union):
-             _fields_ = [("v4", c_uint32),     # struct in_addr
-                        ("v6", c_uint32 * 4),  # struct in6_addr
-                        ("addr8", c_uint8 * 16),
-                        ("addr16", c_uint16 * 8),
-                        ("addr32", c_uint32 * 4)]
+            _fields_ = [("v4", c_uint32),     # struct in_addr
+                       ("v6", c_uint32 * 4),  # struct in6_addr
+                       ("addr8", c_uint8 * 16),
+                       ("addr16", c_uint16 * 8),
+                       ("addr32", c_uint32 * 4)]
 
         _fields_ = [("pfa", _pfa)]
         _anonymous_ = ("pfa",)
@@ -66,7 +66,8 @@ class Generic(object):
             pfctl('-e')
             _pf_context['started_by_sshuttle'] += 1
 
-    def disable(self, anchor):
+    @staticmethod
+    def disable(anchor):
         pfctl('-a %s -F all' % anchor)
         if _pf_context['started_by_sshuttle'] == 1:
             pfctl('-d')
@@ -98,11 +99,13 @@ class Generic(object):
         port = socket.ntohs(self._get_natlook_port(pnl.rdxport))
         return (ip, port)
 
-    def _add_natlook_ports(self, pnl, src_port, dst_port):
+    @staticmethod
+    def _add_natlook_ports(pnl, src_port, dst_port):
         pnl.sxport = socket.htons(src_port)
         pnl.dxport = socket.htons(dst_port)
 
-    def _get_natlook_port(self, xport):
+    @staticmethod
+    def _get_natlook_port(xport):
         return xport
 
     def add_anchors(self, anchor, status=None):
@@ -129,18 +132,22 @@ class Generic(object):
             'I', self.PF_CHANGE_ADD_TAIL), 4)  # action = PF_CHANGE_ADD_TAIL
         ioctl(pf_get_dev(), pf.DIOCCHANGERULE, pr)
 
-    def _inet_version(self, family):
+    @staticmethod
+    def _inet_version(family):
         return b'inet' if family == socket.AF_INET else b'inet6'
 
-    def _lo_addr(self, family):
+    @staticmethod
+    def _lo_addr(family):
         return b'127.0.0.1' if family == socket.AF_INET else b'::1'
 
-    def add_rules(self, anchor, rules):
+    @staticmethod
+    def add_rules(anchor, rules):
         assert isinstance(rules, bytes)
         debug3("rules:\n" + rules.decode("ASCII"))
         pfctl('-a %s -f /dev/stdin' % anchor, rules)
 
-    def has_skip_loopback(self):
+    @staticmethod
+    def has_skip_loopback():
         return b'skip' in pfctl('-s Interfaces -i lo -v')[0]
 
 
diff --git a/sshuttle/server.py b/sshuttle/server.py
index a3a38cd..e40e76b 100644
--- a/sshuttle/server.py
+++ b/sshuttle/server.py
@@ -175,7 +175,8 @@ class DnsProxy(Handler):
             self.to_nameserver = self._addrinfo(peer, port)
         self.try_send()
 
-    def _addrinfo(self, peer, port):
+    @staticmethod
+    def _addrinfo(peer, port):
         if int(port) == 0:
             port = 53
         family, _, _, _, sockaddr = socket.getaddrinfo(peer, port)[0]
diff --git a/sshuttle/ssnet.py b/sshuttle/ssnet.py
index 5c3639c..f506d6a 100644
--- a/sshuttle/ssnet.py
+++ b/sshuttle/ssnet.py
@@ -200,7 +200,8 @@ class SockWrapper:
                 _, e = sys.exc_info()[:2]
                 self.seterr('nowrite: %s' % e)
 
-    def too_full(self):
+    @staticmethod
+    def too_full():
         return False  # fullness is determined by the socket's select() state
 
     def uwrite(self, buf):