1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
# Implements asyncore-based generic DGRAM transport
import socket, errno, sys
from pysnmp.carrier.asynsock.base import AbstractSocketTransport
from pysnmp.carrier.address import TransportAddressPair
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
}
try:
# bad FD may happen upon FD closure on n-1 select() event
sockErrors[errno.EBADFD] = 1
except AttributeError:
# Windows sockets do not have EBADFD
pass
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 sendMessage(self, outgoingMessage, transportAddress):
self.__outQueue.append(
(outgoingMessage, transportAddress)
)
# asyncore API
def handle_connect(self): pass
def writable(self): return self.__outQueue
def handle_write(self):
outgoingMessage, transportAddress = self.__outQueue.pop()
if isinstance(transportAddress, TransportAddressPair):
transportAddress = transportAddress.getRemoteAddr()
debug.logger & debug.flagIO and debug.logger('handle_write: transportAddress %r -> %r outgoingMessage %s' % (self.socket.getsockname(), transportAddress, 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 socket.error(sys.exc_info()[1])
def readable(self): return 1
def handle_read(self):
try:
incomingMessage, transportAddress = self.socket.recvfrom(65535)
debug.logger & debug.flagIO and debug.logger('handle_read: transportAddress %r -> %r incomingMessage %s' % (transportAddress, self.socket.getsockname(), debug.hexdump(incomingMessage)))
transportAddress = TransportAddressPair(
self.socket.getsockname(),
transportAddress
)
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 socket.error(sys.exc_info()[1])
def handle_close(self): pass # no datagram connection
|
