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# Implements asyncore-based generic DGRAM transport
import socket, errno, sys
from pysnmp.carrier.asyncore.base import AbstractSocketTransport
from pysnmp.carrier import sockfix, sockmsg, error
from pysnmp import debug
sockErrors = { # Ignore these socket errors
errno.ESHUTDOWN: 1,
errno.ENOTCONN: 1,
errno.ECONNRESET: 0,
errno.ECONNREFUSED: 0,
errno.EAGAIN: 0,
errno.EWOULDBLOCK: 0
}
if hasattr(errno, 'EBADFD'):
# bad FD may happen upon FD closure on n-1 select() event
sockErrors[errno.EBADFD] = 1
class DgramSocketTransport(AbstractSocketTransport):
sockType = socket.SOCK_DGRAM
retryCount = 3; retryInterval = 1
addressType = lambda x: x
def __init__(self, sock=None, sockMap=None):
self.__outQueue = []
self._sendto = lambda s,b,a: s.sendto(b, a)
def __recvfrom(s, sz):
d, a = s.recvfrom(sz)
return d, self.addressType(a)
self._recvfrom = __recvfrom
AbstractSocketTransport.__init__(self, sock, sockMap)
def openClientMode(self, iface=None):
if iface is not None:
try:
self.socket.bind(iface)
except socket.error:
raise error.CarrierError('bind() for %s failed: %s' % (iface is None and "<all local>" or iface, sys.exc_info()[1]))
return self
def openServerMode(self, iface):
try:
self.socket.bind(iface)
except socket.error:
raise error.CarrierError('bind() for %s failed: %s' % (iface, sys.exc_info()[1],))
return self
def enableBroadcast(self, flag=1):
try:
self.socket.setsockopt(
socket.SOL_SOCKET, socket.SO_BROADCAST, flag
)
except socket.error:
raise error.CarrierError('setsockopt() for SO_BROADCAST failed: %s' % (sys.exc_info()[1],))
debug.logger & debug.flagIO and debug.logger('enableBroadcast: %s option SO_BROADCAST on socket %s' % (turnOn and "enabled" or "disabled", self.socket.fileno()))
return self
def enablePktInfo(self, flag=1):
if not hasattr(self.socket, 'sendmsg') or \
not hasattr(self.socket, 'recvmsg'):
raise error.CarrierError('sendmsg()/recvmsg() interface is not supported by this OS and/or Python version')
try:
if self.socket.family in (socket.AF_INET,socket.AF_INET6):
self.socket.setsockopt(socket.SOL_IP, socket.IP_PKTINFO, flag)
if self.socket.family == socket.AF_INET6:
self.socket.setsockopt(socket.SOL_IPV6, socket.IPV6_RECVPKTINFO, flag)
except socket.error:
raise error.CarrierError('setsockopt() for %s failed: %s' % (self.socket.family == socket.AF_INET6 and "IPV6_RECVPKTINFO" or "IP_PKTINFO", sys.exc_info()[1]))
self._sendto = sockmsg.getSendTo(self.addressType)
self._recvfrom = sockmsg.getRecvFrom(self.addressType)
debug.logger & debug.flagIO and debug.logger('enablePktInfo: %s option %s on socket %s' % (self.socket.family == socket.AF_INET6 and "IPV6_RECVPKTINFO" or "IP_PKTINFO", flag and "enabled" or "disabled", self.socket.fileno()))
return self
def enableTransparent(self, flag=1):
try:
if self.socket.family == socket.AF_INET:
self.socket.setsockopt(
socket.SOL_IP, socket.IP_TRANSPARENT, flag
)
if self.socket.family == socket.AF_INET6:
self.socket.setsockopt(
socket.SOL_IPV6, socket.IP_TRANSPARENT, flag
)
except socket.error:
raise error.CarrierError('setsockopt() for IP_TRANSPARENT failed: %s' % sys.exc_info()[1])
except PermissionError:
raise error.CarrierError('IP_TRANSPARENT socket option requires superusre previleges')
debug.logger & debug.flagIO and debug.logger('enableTransparent: %s option IP_TRANSPARENT on socket %s' % (flag and "enabled" or "disabled", self.socket.fileno()))
return self
def sendMessage(self, outgoingMessage, transportAddress):
self.__outQueue.append(
(outgoingMessage, self.normalizeAddress(transportAddress))
)
debug.logger & debug.flagIO and debug.logger('sendMessage: outgoingMessage queued (%d octets) %s' % (len(outgoingMessage), debug.hexdump(outgoingMessage)))
def normalizeAddress(self, transportAddress):
if not isinstance(transportAddress, self.addressType):
transportAddress = self.addressType(transportAddress)
if not transportAddress.getLocalAddress():
transportAddress.setLocalAddress(self.getLocalAddress())
return transportAddress
def getLocalAddress(self):
# one evil OS does not seem to support getsockname() for DGRAM sockets
try:
return self.socket.getsockname()
except:
return ('0.0.0.0', 0)
# asyncore API
def handle_connect(self): pass
def writable(self): return self.__outQueue
def handle_write(self):
outgoingMessage, transportAddress = self.__outQueue.pop(0)
debug.logger & debug.flagIO and debug.logger('handle_write: transportAddress %r -> %r outgoingMessage (%d octets) %s' % (transportAddress.getLocalAddress(), transportAddress, len(outgoingMessage), debug.hexdump(outgoingMessage)))
if not transportAddress:
debug.logger & debug.flagIO and debug.logger('handle_write: missing dst address, loosing outgoing msg')
return
try:
self._sendto(
self.socket, outgoingMessage, transportAddress
)
except socket.error:
if sys.exc_info()[1].args[0] in sockErrors:
debug.logger & debug.flagIO and debug.logger('handle_write: ignoring socket error %s' % (sys.exc_info()[1],))
else:
raise error.CarrierError('sendto() failed for %s: %s' % (transportAddress, sys.exc_info()[1]))
def readable(self): return 1
def handle_read(self):
try:
incomingMessage, transportAddress = self._recvfrom(
self.socket, 65535
)
transportAddress = self.normalizeAddress(transportAddress)
debug.logger & debug.flagIO and debug.logger('handle_read: transportAddress %r -> %r incomingMessage (%d octets) %s' % (transportAddress, transportAddress.getLocalAddress(), len(incomingMessage), debug.hexdump(incomingMessage)))
if not incomingMessage:
self.handle_close()
return
else:
self._cbFun(self, transportAddress, incomingMessage)
return
except socket.error:
if sys.exc_info()[1].args[0] in sockErrors:
debug.logger & debug.flagIO and debug.logger('handle_read: known socket error %s' % (sys.exc_info()[1],))
sockErrors[sys.exc_info()[1].args[0]] and self.handle_close()
return
else:
raise error.CarrierError('recvfrom() failed: %s' % (sys.exc_info()[1],))
def handle_close(self): pass # no datagram connection
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