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# Implements asyncore-based generic DGRAM transport
import socket, errno, sys
from pysnmp.carrier.asynsock.base import AbstractSocketTransport
from pysnmp.carrier import 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
def __init__(self, sock=None, sockMap=None):
self.__outQueue = []
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=True):
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],))
return self
def sendMessage(self, outgoingMessage, transportAddress):
self.__outQueue.append(
(outgoingMessage, transportAddress)
)
debug.logger & debug.flagIO and debug.logger('sendMessage: outgoingMessage queued (%d octets) %s' % (len(outgoingMessage), debug.hexdump(outgoingMessage)))
def normalizeAddress(self, transportAddress): 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' % (self.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.socket.sendto(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.socket.recvfrom(65535)
transportAddress = self.normalizeAddress(transportAddress)
debug.logger & debug.flagIO and debug.logger('handle_read: transportAddress %r -> %r incomingMessage (%d octets) %s' % (transportAddress, self.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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