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List: net-snmp-users
Subject: perl / translate bit string into English
From: Stuart Kendrick <stuartk () alleninstitute ! org>
Date: 2016-04-11 3:14:35
Message-ID: CY1PR12MB02955A8B6B8BEBCD19BD6F82C3940 () CY1PR12MB0295 ! namprd12 ! prod ! outlook ! com
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(1) In what format does the Perl module return a BITS flavor of OID?
- It sort of looks like a hex string ... but not quite.
- I'm using net-snmp-5.7.3
(2) Seems to me that SNMP.pm does not translate a string of bits into English. Am \
I correct?
(3) So I figured I'd do it myself. But I'm struggling to see how. How might I \
translate the hex string which SNMP.pm gives me into English, given that I'm willing \
to build a one-off translator for each object?
Here is an example:
host$ snmpget -c public test-esx IEEE8023-LAG-MIB::dot3adAggPortActorOperState.10701
IEEE8023-LAG-MIB::dot3adAggPortActorOperState.10701 = BITS: BC lacpActivity(0) \
aggregation(2) synchronization(3) collecting(4) distributing(5)
host% cat test-script
[....]
say "dot3adAggPortActorOperState_before = '$dot3adAggPortActorOperState_before'";
[...]
host% ./test-script
[...]
dot3adAggPortActorOperState_before = 'BC '
[...]
host% cat IEEE8023-LAG-MIB
[...]
dot3adAggPortActorOperState OBJECT-TYPE
SYNTAX LacpState
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"A string of 8 bits, corresponding to the current
operational values of Actor_State as transmitted by the
Actor in LACPDUs. The bit allocations are as defined in
6.3.2.1.20. This attribute value is read-only."
REFERENCE
"6.3.2.1.21"
::= { dot3adAggPortEntry 21 }
[...]
LacpState ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"The Actor and Partner State values from the LACPDU."
SYNTAX BITS {
lacpActivity(0),
lacpTimeout(1),
aggregation(2),
synchronization(3),
collecting(4),
distributing(5),
defaulted(6),
expired(7)
}
In the example above, I would have predicted the following
lacpActivity = 1
lacpTimeout = 0
aggregration = 1
synchronization = 1
collecting = 1
distributing = 1
defaulted = 0
expired = 0
[In other words, five of the eight bits are set to 1, while the remaining three are \
set to zero.]
To my way of thinking this would produce something like the following:
10 11 11 00 = A B B 0 = ABB0
Or, perhaps the other way around, if the bits appear in the opposite order:
00 11 11 01 = 0 BB 1 = 0BB1
But instead, SNMP.pm spits out 'BC ', i.e. B followed by C followed by a pair of \
spaces. I don't see how to translate 'BC ' back into a string of bits, which I \
could then parse to produce English text.
(4) Am I headed off into the weeds? Or might there cheese at the end of this \
tunnel?
--sk
Stuart Kendrick
Seattle, WA USA
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<div class="WordSection1">
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo3"><![if \
!supportLists]><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"><span \
style="mso-list:Ignore">(1)<span style="font:7.0pt "Times New \
Roman""> </span></span></span><![endif]><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">In what format does \
the Perl module return a BITS flavor of OID?<o:p></o:p></span></p> <p \
class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l2 level1 lfo2"><![if \
!supportLists]><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"><span \
style="mso-list:Ignore">-<span style="font:7.0pt "Times New \
Roman""> \
</span></span></span><![endif]><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">It sort of looks \
like a hex string … but not quite.<o:p></o:p></span></p> <p \
class="MsoListParagraph" style="text-indent:-.25in;mso-list:l2 level1 lfo2"><![if \
!supportLists]><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"><span \
style="mso-list:Ignore">-<span style="font:7.0pt "Times New \
Roman""> \
</span></span></span><![endif]><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">I’m using \
net-snmp-5.7.3<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo3"><![if \
!supportLists]><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"><span \
style="mso-list:Ignore">(2)<span style="font:7.0pt "Times New \
Roman""> </span></span></span><![endif]><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">Seems to me that \
SNMP.pm does not translate a string of bits into English. Am I \
correct?<o:p></o:p></span></p> <p class="MsoListParagraph"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo3"><![if \
!supportLists]><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"><span \
style="mso-list:Ignore">(3)<span style="font:7.0pt "Times New \
Roman""> </span></span></span><![endif]><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">So I figured \
I’d do it myself. But I’m struggling to see how. How might I \
translate the hex string which SNMP.pm gives me into English, given that I’m \
willing to build a one-off translator for each object?<o:p></o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">Here is an \
example:<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">host$ snmpget -c \
public test-esx IEEE8023-LAG-MIB::dot3adAggPortActorOperState.10701<o:p></o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">IEEE8023-LAG-MIB::dot3adAggPortActorOperState.10701 \
= BITS: BC lacpActivity(0) aggregation(2) synchronization(3) collecting(4) \
distributing(5)<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">host% cat \
test-script<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">[....]<o:p></o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">say \
"dot3adAggPortActorOperState_before = \
'$dot3adAggPortActorOperState_before'";<o:p></o:p></span></p> <p \
class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">[...]<o:p></o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">host% \
./test-script<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">[...]<o:p></o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">dot3adAggPortActorOperState_before \
= 'BC '<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">[...]<o:p></o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">host% cat \
IEEE8023-LAG-MIB<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">[...]<o:p></o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">dot3adAggPortActorOperState \
OBJECT-TYPE<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"> \
SYNTAX LacpState<o:p></o:p></span></p> <p \
class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"> \
MAX-ACCESS read-only<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"> \
STATUS current<o:p></o:p></span></p> <p \
class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"> \
DESCRIPTION<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"> \
"A string of 8 bits, corresponding to the current<o:p></o:p></span></p> <p \
class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"> \
operational values of Actor_State as transmitted by the<o:p></o:p></span></p> <p \
class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"> \
Actor in LACPDUs. The bit allocations are as defined in<o:p></o:p></span></p> <p \
class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"> \
6.3.2.1.20. This attribute value is read-only."<o:p></o:p></span></p> <p \
class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"> \
REFERENCE<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"> \
"6.3.2.1.21"<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"> \
::= { dot3adAggPortEntry 21 }<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">[...]<o:p></o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">LacpState ::= \
TEXTUAL-CONVENTION<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"> \
STATUS current<o:p></o:p></span></p> <p \
class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"> \
DESCRIPTION<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"> \
"The Actor and Partner State values from the LACPDU."<o:p></o:p></span></p> \
<p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"> \
SYNTAX BITS {<o:p></o:p></span></p> <p \
class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"> &n \
bsp; \
lacpActivity(0),<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"> &n \
bsp; \
lacpTimeout(1),<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"> &n \
bsp; \
aggregation(2),<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"> &n \
bsp; \
synchronization(3),<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"> &n \
bsp; \
collecting(4),<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"> \
distributing(5),<o:p></o:p></span></p> <p \
class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"> &n \
bsp; \
defaulted(6),<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"> &n \
bsp; \
expired(7)<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"> \
}<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">In the example \
above, I would have predicted the following<o:p></o:p></span></p> <p \
class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">lacpActivity \
= 1<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">lacpTimeout = \
0<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">aggregration = \
1<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">synchronization = \
1<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">collecting = \
1<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">distributing = \
1<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">defaulted = \
0<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">expired = \
0<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">[In other words, \
five of the eight bits are set to 1, while the remaining three are set to \
zero.]<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">To my way of \
thinking this would produce something like the following:<o:p></o:p></span></p> <p \
class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">10 11 11 00 = A B B \
0 = ABB0<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">Or, perhaps the \
other way around, if the bits appear in the opposite order:<o:p></o:p></span></p> <p \
class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">00 11 11 01 = 0 BB \
1 = 0BB1<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">But instead, \
SNMP.pm spits out ‘BC ‘, i.e. B followed by C followed by a pair of \
spaces. I don’t see how to translate ‘BC ‘ back into a \
string of bits, which I could then parse to produce English \
text.<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo3"><![if \
!supportLists]><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"><span \
style="mso-list:Ignore">(4)<span style="font:7.0pt "Times New \
Roman""> </span></span></span><![endif]><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">Am I headed off \
into the weeds? Or might there cheese at the end of this \
tunnel?<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Arial",sans-serif">--sk</span> \
<o:p></o:p></p> <p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Stuart Kendrick<o:p></o:p></p>
<p class="MsoNormal">Seattle, WA USA<o:p></o:p></p>
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