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
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
|
#
# This file is part of pysnmp software.
#
# Copyright (c) 2005-2018, Ilya Etingof <etingof@gmail.com>
# License: http://snmplabs.com/pysnmp/license.html
#
import sys
import traceback
from pysnmp.smi import error
from pysnmp import debug
__all__ = ['AbstractMibInstrumController', 'MibInstrumController']
class AbstractMibInstrumController(object):
def readVars(self, varBinds, acInfo=(None, None)):
raise error.NoSuchInstanceError(idx=0)
def readNextVars(self, varBinds, acInfo=(None, None)):
raise error.EndOfMibViewError(idx=0)
def writeVars(self, varBinds, acInfo=(None, None)):
raise error.NoSuchObjectError(idx=0)
class MibInstrumController(AbstractMibInstrumController):
fsmReadVar = {
# ( state, status ) -> newState
('start', 'ok'): 'readTest',
('readTest', 'ok'): 'readGet',
('readGet', 'ok'): 'stop',
('*', 'err'): 'stop'
}
fsmReadNextVar = {
# ( state, status ) -> newState
('start', 'ok'): 'readTestNext',
('readTestNext', 'ok'): 'readGetNext',
('readGetNext', 'ok'): 'stop',
('*', 'err'): 'stop'
}
fsmWriteVar = {
# ( state, status ) -> newState
('start', 'ok'): 'writeTest',
('writeTest', 'ok'): 'writeCommit',
('writeCommit', 'ok'): 'writeCleanup',
('writeCleanup', 'ok'): 'readTest',
# Do read after successful write
('readTest', 'ok'): 'readGet',
('readGet', 'ok'): 'stop',
# Error handling
('writeTest', 'err'): 'writeCleanup',
('writeCommit', 'err'): 'writeUndo',
('writeUndo', 'ok'): 'readTest',
# Ignore read errors (removed columns)
('readTest', 'err'): 'stop',
('readGet', 'err'): 'stop',
('*', 'err'): 'stop'
}
def __init__(self, mibBuilder):
self.mibBuilder = mibBuilder
self.lastBuildId = -1
self.lastBuildSyms = {}
def getMibBuilder(self):
return self.mibBuilder
# MIB indexing
def __indexMib(self):
# Build a tree from MIB objects found at currently loaded modules
if self.lastBuildId == self.mibBuilder.lastBuildId:
return
(MibScalarInstance, MibScalar, MibTableColumn, MibTableRow,
MibTable) = self.mibBuilder.importSymbols(
'SNMPv2-SMI', 'MibScalarInstance', 'MibScalar',
'MibTableColumn', 'MibTableRow', 'MibTable'
)
mibTree, = self.mibBuilder.importSymbols('SNMPv2-SMI', 'iso')
#
# Management Instrumentation gets organized as follows:
#
# MibTree
# |
# +----MibScalar
# | |
# | +-----MibScalarInstance
# |
# +----MibTable
# |
# +----MibTableRow
# |
# +-------MibTableColumn
# |
# +------MibScalarInstance(s)
#
# Mind you, only Managed Objects get indexed here, various MIB defs and
# constants can't be SNMP managed so we drop them.
#
scalars = {}
instances = {}
tables = {}
rows = {}
cols = {}
# Sort by module name to give user a chance to slip-in
# custom MIB modules (that would be sorted out first)
mibSymbols = list(self.mibBuilder.mibSymbols.items())
mibSymbols.sort(key=lambda x: x[0], reverse=True)
for modName, mibMod in mibSymbols:
for symObj in mibMod.values():
if isinstance(symObj, MibTable):
tables[symObj.name] = symObj
elif isinstance(symObj, MibTableRow):
rows[symObj.name] = symObj
elif isinstance(symObj, MibTableColumn):
cols[symObj.name] = symObj
elif isinstance(symObj, MibScalarInstance):
instances[symObj.name] = symObj
elif isinstance(symObj, MibScalar):
scalars[symObj.name] = symObj
# Detach items from each other
for symName, parentName in self.lastBuildSyms.items():
if parentName in scalars:
scalars[parentName].unregisterSubtrees(symName)
elif parentName in cols:
cols[parentName].unregisterSubtrees(symName)
elif parentName in rows:
rows[parentName].unregisterSubtrees(symName)
else:
mibTree.unregisterSubtrees(symName)
lastBuildSyms = {}
# Attach Managed Objects Instances to Managed Objects
for inst in instances.values():
if inst.typeName in scalars:
scalars[inst.typeName].registerSubtrees(inst)
elif inst.typeName in cols:
cols[inst.typeName].registerSubtrees(inst)
else:
raise error.SmiError(
'Orphan MIB scalar instance %r at %r' % (inst, self)
)
lastBuildSyms[inst.name] = inst.typeName
# Attach Table Columns to Table Rows
for col in cols.values():
rowName = col.name[:-1] # XXX
if rowName in rows:
rows[rowName].registerSubtrees(col)
else:
raise error.SmiError(
'Orphan MIB table column %r at %r' % (col, self)
)
lastBuildSyms[col.name] = rowName
# Attach Table Rows to MIB tree
for row in rows.values():
mibTree.registerSubtrees(row)
lastBuildSyms[row.name] = mibTree.name
# Attach Tables to MIB tree
for table in tables.values():
mibTree.registerSubtrees(table)
lastBuildSyms[table.name] = mibTree.name
# Attach Scalars to MIB tree
for scalar in scalars.values():
mibTree.registerSubtrees(scalar)
lastBuildSyms[scalar.name] = mibTree.name
self.lastBuildSyms = lastBuildSyms
self.lastBuildId = self.mibBuilder.lastBuildId
debug.logger & debug.flagIns and debug.logger('__indexMib: rebuilt')
# MIB instrumentation
def flipFlopFsm(self, fsmTable, inputVarBinds, acInfo):
self.__indexMib()
debug.logger & debug.flagIns and debug.logger('flipFlopFsm: input var-binds %r' % (inputVarBinds,))
mibTree, = self.mibBuilder.importSymbols('SNMPv2-SMI', 'iso')
outputVarBinds = []
state, status = 'start', 'ok'
origExc = None
while True:
k = (state, status)
if k in fsmTable:
fsmState = fsmTable[k]
else:
k = ('*', status)
if k in fsmTable:
fsmState = fsmTable[k]
else:
raise error.SmiError(
'Unresolved FSM state %s, %s' % (state, status)
)
debug.logger & debug.flagIns and debug.logger(
'flipFlopFsm: state %s status %s -> fsmState %s' % (state, status, fsmState))
state = fsmState
status = 'ok'
if state == 'stop':
break
idx = 0
for name, val in inputVarBinds:
f = getattr(mibTree, state, None)
if f is None:
raise error.SmiError(
'Unsupported state handler %s at %s' % (state, self)
)
try:
# Convert to tuple to avoid ObjectName instantiation
# on subscription
rval = f(tuple(name), val, idx, acInfo)
except error.SmiError:
exc_t, exc_v, exc_tb = sys.exc_info()
debug.logger & debug.flagIns and debug.logger(
'flipFlopFsm: fun %s exception %s for %s=%r with traceback: %s' % (
f, exc_t, name, val, traceback.format_exception(exc_t, exc_v, exc_tb)))
if origExc is None: # Take the first exception
origExc, origTraceback = exc_v, exc_tb
status = 'err'
break
else:
debug.logger & debug.flagIns and debug.logger(
'flipFlopFsm: fun %s suceeded for %s=%r' % (f, name, val))
if rval is not None:
outputVarBinds.append((rval[0], rval[1]))
idx += 1
if origExc:
if sys.version_info[0] <= 2:
raise origExc
else:
try:
raise origExc.with_traceback(origTraceback)
finally:
# Break cycle between locals and traceback object
# (seems to be irrelevant on Py3 but just in case)
del origTraceback
return outputVarBinds
def readVars(self, varBinds, acInfo=(None, None)):
return self.flipFlopFsm(self.fsmReadVar, varBinds, acInfo)
def readNextVars(self, varBinds, acInfo=(None, None)):
return self.flipFlopFsm(self.fsmReadNextVar, varBinds, acInfo)
def writeVars(self, varBinds, acInfo=(None, None)):
return self.flipFlopFsm(self.fsmWriteVar, varBinds, acInfo)
|
