/usr/lib/python3/dist-packages/pysnmp/smi/builder.py is in python3-pysnmp4 4.2.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import os, sys, imp, struct, marshal, time, traceback
from pysnmp.smi import error
from pysnmp import debug
if sys.version_info[0] <= 2:
import types
classTypes = (types.ClassType, type)
else:
classTypes = (type,)
class __AbstractMibSource:
def __init__(self, srcName):
self._srcName = srcName
self.__magic = imp.get_magic()
self.__sfx = {}
self.__inited = None
for sfx, mode, typ in imp.get_suffixes():
if typ not in self.__sfx:
self.__sfx[typ] = []
self.__sfx[typ].append((sfx, len(sfx), mode))
debug.logger & debug.flagBld and debug.logger('trying %s' % self)
def __repr__(self):
return '%s(%r)' % (self.__class__.__name__, self._srcName)
def _uniqNames(self, files):
u = {}
for f in files:
if f[:9] == '__init__.':
continue
for typ in (imp.PY_SOURCE, imp.PY_COMPILED):
for sfx, sfxLen, mode in self.__sfx[typ]:
if f[-sfxLen:] == sfx:
u[f[:-sfxLen]] = None
return tuple(u.keys())
# MibSource API follows
def fullPath(self, f='', sfx=''):
return self._srcName + (f and (os.sep + f + sfx) or '')
def init(self):
if self.__inited is None:
self.__inited = self._init()
if self.__inited is self:
self.__inited = True
if self.__inited is True:
return self
else:
return self.__inited
def listdir(self): return self._listdir()
def read(self, f):
for pycSfx, pycSfxLen, pycMode in self.__sfx[imp.PY_COMPILED]:
try:
pycData = self._getData(f + pycSfx, pycMode)
except IOError:
pycTime = -1
else:
if self.__magic == pycData[:4]:
pycData = pycData[4:]
pycTime = struct.unpack('<L', pycData[:4])[0]
pycData = pycData[4:]
break
else:
debug.logger & debug.flagBld and debug.logger(
'bad magic in %s' % (f+pycSfx,)
)
pycTime = -1
debug.logger & debug.flagBld and debug.logger(
'file %s mtime %d' % (f+pycSfx, pycTime)
)
for pySfx, pySfxLen, pyMode in self.__sfx[imp.PY_SOURCE]:
try:
pyTime = self._getTimestamp(f+pySfx)
except (IOError, OSError):
pyTime = -1
else:
break
debug.logger & debug.flagBld and debug.logger(
'file %s mtime %d' % (f+pySfx, pyTime)
)
if pycTime != -1 and pycTime >= pyTime:
return marshal.loads(pycData), pycSfx
if pyTime != -1:
return self._getData(f+pySfx, pyMode), pySfx
raise IOError('No suitable module found')
# Interfaces for subclasses
def _init(self): raise NotImplementedError()
def _listdir(self): raise NotImplementedError()
def _getTimestamp(self, f): raise NotImplementedError()
def _getData(self, f, mode=None): NotImplementedError()
class ZipMibSource(__AbstractMibSource):
def _init(self):
try:
p = __import__(self._srcName, globals(), locals(), ['__init__'])
if hasattr(p, '__loader__') and hasattr(p.__loader__, '_files'):
self.__loader = p.__loader__
self._srcName = self._srcName.replace('.', os.sep)
return self
else:
# Dir relative to PYTHONPATH
return DirMibSource(os.path.split(p.__file__)[0]).init()
except ImportError:
# Dir relative to CWD
return DirMibSource(self._srcName).init()
def _parseDosTime(self, dosdate, dostime):
t = ( ((dosdate >> 9) & 0x7f) + 1980, # year
((dosdate >> 5) & 0x0f), # month
dosdate & 0x1f, # mday
(dostime >> 11) & 0x1f, # hour
(dostime >> 5) & 0x3f, # min
(dostime & 0x1f) * 2, # sec
-1, # wday
-1, # yday
-1 ) # dst
return time.mktime(t)
def _listdir(self):
l = []
for f in self.__loader._files.keys():
d, f = os.path.split(f)
if d == self._srcName:
l.append(f)
return tuple(self._uniqNames(l))
def _getTimestamp(self, f):
p = os.path.join(self._srcName, f)
if p in self.__loader._files:
return self._parseDosTime(
self.__loader._files[p][6],
self.__loader._files[p][5]
)
else:
raise IOError('No file in ZIP: %s' % p)
def _getData(self, f, mode=None):
return self.__loader.get_data(os.path.join(self._srcName, f))
class DirMibSource(__AbstractMibSource):
def _init(self):
self._srcName = os.path.normpath(self._srcName)
return self
def _listdir(self):
try:
return self._uniqNames(os.listdir(self._srcName))
except OSError:
return ()
def _getTimestamp(self, f):
return os.stat(os.path.join(self._srcName, f))[8]
def _getData(self, f, mode):
try:
if f in os.listdir(self._srcName): # make FS case-sensitive
return open(os.path.join(self._srcName, f), mode).read()
except OSError:
pass
raise IOError # pretend there's no such file
class MibBuilder:
loadTexts = 0
defaultCoreMibs = os.pathsep.join(
('pysnmp.smi.mibs.instances', 'pysnmp.smi.mibs')
)
defaultMiscMibs = 'pysnmp_mibs'
moduleID = 'PYSNMP_MODULE_ID'
def __init__(self):
self.lastBuildId = self._autoName = 0
sources = []
for m in os.environ.get('PYSNMP_MIB_PKGS', self.defaultCoreMibs).split(os.pathsep):
sources.append(ZipMibSource(m))
# Compatibility variable
if 'PYSNMP_MIB_DIR' in os.environ:
os.environ['PYSNMP_MIB_DIRS'] = os.environ['PYSNMP_MIB_DIR']
if 'PYSNMP_MIB_DIRS' in os.environ:
for m in os.environ['PYSNMP_MIB_DIRS'].split(os.pathsep):
sources.append(DirMibSource(m))
if self.defaultMiscMibs:
for m in self.defaultMiscMibs.split(os.pathsep):
sources.append(ZipMibSource(m))
self.mibSymbols = {}
self.__modSeen = {}
self.__modPathsSeen = {}
self.setMibSources(*sources)
# MIB modules management
def setMibSources(self, *mibSources):
self.__mibSources = [ s.init() for s in mibSources ]
debug.logger & debug.flagBld and debug.logger('setMibPath: new MIB sources %s' % (self.__mibSources,))
def getMibSources(self): return tuple(self.__mibSources)
# Legacy/compatibility methods (won't work for .eggs)
def setMibPath(self, *mibPaths):
self.setMibSources(*[ DirMibSource(x) for x in mibPaths ])
def getMibPath(self):
paths = ()
for mibSource in self.getMibSources():
if isinstance(mibSource, DirMibSource):
paths += ( mibSource.fullPath(), )
else:
raise error.SmiError(
'MIB source is not a plain directory: %s' % (mibSource,)
)
return paths
def loadModules(self, *modNames, **userCtx):
# Build a list of available modules
if not modNames:
modNames = {}
for mibSource in self.__mibSources:
for modName in mibSource.listdir():
modNames[modName] = None
modNames = list(modNames.keys())
if not modNames:
raise error.SmiError(
'No MIB module to load at %s' % (self,)
)
for modName in modNames:
for mibSource in self.__mibSources:
debug.logger & debug.flagBld and debug.logger('loadModules: trying %s at %s' % (modName, mibSource))
try:
modData, sfx = mibSource.read(modName)
except IOError:
debug.logger & debug.flagBld and debug.logger('loadModules: read %s from %s failed: %s' % (modName, mibSource, sys.exc_info()[1]))
continue
modPath = mibSource.fullPath(modName, sfx)
if modPath in self.__modPathsSeen:
debug.logger & debug.flagBld and debug.logger('loadModules: seen %s' % modPath)
break
else:
self.__modPathsSeen[modPath] = 1
debug.logger & debug.flagBld and debug.logger('loadModules: evaluating %s' % modPath)
g = { 'mibBuilder': self,
'userCtx': userCtx }
try:
exec(modData, g)
except Exception:
del self.__modPathsSeen[modPath]
raise error.SmiError(
'MIB module \"%s\" load error: %s' % (modPath, traceback.format_exception(*sys.exc_info()))
)
self.__modSeen[modName] = modPath
debug.logger & debug.flagBld and debug.logger('loadModules: loaded %s' % modPath)
break
if modName not in self.__modSeen:
raise error.SmiError(
'MIB file \"%s\" not found in search path' % (modName and modName + ".py[co]")
)
return self
def unloadModules(self, *modNames):
if not modNames:
modNames = list(self.mibSymbols.keys())
for modName in modNames:
if modName not in self.mibSymbols:
raise error.SmiError(
'No module %s at %s' % (modName, self)
)
self.unexportSymbols(modName)
del self.__modPathsSeen[self.__modSeen[modName]]
del self.__modSeen[modName]
debug.logger & debug.flagBld and debug.logger('unloadModules: ' % (modName))
return self
def importSymbols(self, modName, *symNames, **userCtx):
if not modName:
raise error.SmiError(
'importSymbols: empty MIB module name'
)
r = ()
for symName in symNames:
if modName not in self.mibSymbols:
self.loadModules(modName, **userCtx)
if modName not in self.mibSymbols:
raise error.SmiError(
'No module %s loaded at %s' % (modName, self)
)
if symName not in self.mibSymbols[modName]:
raise error.SmiError(
'No symbol %s::%s at %s' % (modName, symName, self)
)
r = r + (self.mibSymbols[modName][symName],)
return r
def exportSymbols(self, modName, *anonymousSyms, **namedSyms):
if modName not in self.mibSymbols:
self.mibSymbols[modName] = {}
mibSymbols = self.mibSymbols[modName]
for symObj in anonymousSyms:
debug.logger & debug.flagBld and debug.logger('exportSymbols: anonymous symbol %s::__pysnmp_%ld' % (modName, self._autoName))
mibSymbols['__pysnmp_%ld' % self._autoName] = symObj
self._autoName = self._autoName + 1
for symName, symObj in namedSyms.items():
if symName in mibSymbols:
raise error.SmiError(
'Symbol %s already exported at %s' % (symName, modName)
)
if symName != self.moduleID and \
not isinstance(symObj, classTypes):
label = symObj.getLabel()
if label:
symName = label
else:
symObj.setLabel(symName)
mibSymbols[symName] = symObj
debug.logger & debug.flagBld and debug.logger('exportSymbols: symbol %s::%s' % (modName, symName))
self.lastBuildId = self.lastBuildId + 1
def unexportSymbols(self, modName, *symNames):
if modName not in self.mibSymbols:
raise error.SmiError(
'No module %s at %s' % (modName, self)
)
mibSymbols = self.mibSymbols[modName]
if not symNames:
symNames = list(mibSymbols.keys())
for symName in symNames:
if symName not in mibSymbols:
raise error.SmiError(
'No symbol %s::%s at %s' % (modName, symName, self)
)
del mibSymbols[symName]
debug.logger & debug.flagBld and debug.logger('unexportSymbols: symbol %s::%s' % (modName, symName))
if not self.mibSymbols[modName]:
del self.mibSymbols[modName]
self.lastBuildId = self.lastBuildId + 1
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