summaryrefslogtreecommitdiffstats
path: root/scripts/external_libs/scapy-2.3.1/python2/scapy/asn1/mib.py
blob: 8531fcf21479667f80d9f7bd0bbc3e36edfeca96 (plain)
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
## This file is part of Scapy
## See http://www.secdev.org/projects/scapy for more informations
## Copyright (C) Philippe Biondi <phil@secdev.org>
## This program is published under a GPLv2 license

"""
Management Information Base (MIB) parsing
"""

import re
from glob import glob
from scapy.dadict import DADict,fixname
from scapy.config import conf
from scapy.utils import do_graph

#################
## MIB parsing ##
#################

_mib_re_integer = re.compile("^[0-9]+$")
_mib_re_both = re.compile("^([a-zA-Z_][a-zA-Z0-9_-]*)\(([0-9]+)\)$")
_mib_re_oiddecl = re.compile("$\s*([a-zA-Z0-9_-]+)\s+OBJECT([^:\{\}]|\{[^:]+\})+::=\s*\{([^\}]+)\}",re.M)
_mib_re_strings = re.compile('"[^"]*"')
_mib_re_comments = re.compile('--.*(\r|\n)')

class MIBDict(DADict):
    def _findroot(self, x):
        if x.startswith("."):
            x = x[1:]
        if not x.endswith("."):
            x += "."
        max=0
        root="."
        for k in self.keys():
            if x.startswith(self[k]+"."):
                if max < len(self[k]):
                    max = len(self[k])
                    root = k
        return root, x[max:-1]
    def _oidname(self, x):
        root,remainder = self._findroot(x)
        return root+remainder
    def _oid(self, x):
        xl = x.strip(".").split(".")
        p = len(xl)-1
        while p >= 0 and _mib_re_integer.match(xl[p]):
            p -= 1
        if p != 0 or xl[p] not in self:
            return x
        xl[p] = self[xl[p]] 
        return ".".join(xl[p:])
    def _make_graph(self, other_keys=[], **kargs):
        nodes = [(k,self[k]) for k in self.keys()]
        oids = [self[k] for k in self.keys()]
        for k in other_keys:
            if k not in oids:
                nodes.append(self.oidname(k),k)
        s = 'digraph "mib" {\n\trankdir=LR;\n\n'
        for k,o in nodes:
            s += '\t"%s" [ label="%s"  ];\n' % (o,k)
        s += "\n"
        for k,o in nodes:
            parent,remainder = self._findroot(o[:-1])
            remainder = remainder[1:]+o[-1]
            if parent != ".":
                parent = self[parent]
            s += '\t"%s" -> "%s" [label="%s"];\n' % (parent, o,remainder)
        s += "}\n"
        do_graph(s, **kargs)
    def __len__(self):
        return len(self.keys())


def mib_register(ident, value, the_mib, unresolved):
    if ident in the_mib or ident in unresolved:
        return ident in the_mib
    resval = []
    not_resolved = 0
    for v in value:
        if _mib_re_integer.match(v):
            resval.append(v)
        else:
            v = fixname(v)
            if v not in the_mib:
                not_resolved = 1
            if v in the_mib:
                v = the_mib[v]
            elif v in unresolved:
                v = unresolved[v]
            if type(v) is list:
                resval += v
            else:
                resval.append(v)
    if not_resolved:
        unresolved[ident] = resval
        return False
    else:
        the_mib[ident] = resval
        keys = unresolved.keys()
        i = 0
        while i < len(keys):
            k = keys[i]
            if mib_register(k,unresolved[k], the_mib, {}):
                del(unresolved[k])
                del(keys[i])
                i = 0
            else:
                i += 1
                    
        return True


def load_mib(filenames):
    the_mib = {'iso': ['1']}
    unresolved = {}
    for k in conf.mib.keys():
        mib_register(k, conf.mib[k].split("."), the_mib, unresolved)

    if type(filenames) is str:
        filenames = [filenames]
    for fnames in filenames:
        for fname in glob(fnames):
            f = open(fname)
            text = f.read()
            cleantext = " ".join(_mib_re_strings.split(" ".join(_mib_re_comments.split(text))))
            for m in _mib_re_oiddecl.finditer(cleantext):
                gr = m.groups()
                ident,oid = gr[0],gr[-1]
                ident=fixname(ident)
                oid = oid.split()
                for i in range(len(oid)):
                    m = _mib_re_both.match(oid[i])
                    if m:
                        oid[i] = m.groups()[1]
                mib_register(ident, oid, the_mib, unresolved)

    newmib = MIBDict(_name="MIB")
    for k,o in the_mib.iteritems():
        newmib[k]=".".join(o)
    for k,o in unresolved.iteritems():
        newmib[k]=".".join(o)

    conf.mib=newmib



conf.mib = MIBDict(_name="MIB")