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SNMP protocol in Logic Machine

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SNMP protocol in Logic Machine
Carlos Padilla Offline
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#41
18.07.2019, 14:07
Attached an example for a data type OCTET STRING. It is important to clarify that if you want to send a value, it must be passed from ascii to hexadecimal and separated by two points (Smile. For example, the asci 30 when passed to hexadecimal is 33:30. On the other hand, when writing the type of data to write, you can use the type of data or the number that represents it, according to the documentation of LUA SNMP (http://luasnmp.luaforge.net/ objects.html), whichever of the two is possible.
Code:
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val=event.getvalue() require('snmp') conn, err = snmp.open({   version = snmp.SNMPv1,   community = 'public',   peer = '192.168.0.222', }) assert(conn, err) if val==true then   vbIn = {     {oid = "1.3.6.1.4.1.1248.4.1.1.2.1.0", type=snmp.TYPE_INTEGER, value = "1"},     {oid = "1.3.6.1.4.1.1248.4.1.1.2.2.0", type=2, value = "33:30"}     } vbOut, err, index = conn:set(vbIn)   log(vbOut)   else   vbIn = { {oid = "1.3.6.1.4.1.1248.4.1.1.2.1.0", type=snmp.TYPE_INTEGER, value = "0"}  } vbOut, err, index = conn:set(vbIn)     end conn:close()
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DGrandes Offline
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#42
03.11.2019, 20:26
Hi,

Is there any way to get an entire table by snmp?
I see the table in Mib browser and I can get single value of table but if i try to put table oid value = nil.
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DGrandes Offline
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#43
04.11.2019, 08:38
Hi,

I´ve seen in snmp lua manual that appears different commands but I don´t see getsubtree command.
How can I implement this command to get the table?

Is there any documentation about snmp in logicmachine?
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admin Offline
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#44
04.11.2019, 12:12
Use this code to walk through SNMP:
Code:
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function walk(peer, community, version, root)   local snmp = require('snmp')   local session, err = snmp.open({     peer = peer,     community = community or 'public',     version = version or snmp.SNMPv1   })   if not session then     return nil, 'unable to open session: ' .. tostring(err)   end   root = root or '1'   local vb = { oid = root }   local err   local res = {}   while true do     vb, err = session:getnext(vb)     if err then       break     elseif string.find(vb.oid, root) == nil or vb.type == snmp.ENDOFMIBVIEW then       break     else       res[ vb.oid ] = vb.value     end   end   session:close()   if err then     return nil, 'walk failed: ' .. tostring(err)   else     return res   end end res, err = walk('192.168.1.1', 'public', snmp.SNMPv1, '1.0.8802.1.1.2.1.3') log(res, err)

Arguments for walk:
1. remote device IP
2. community, defaults to 'public'
3. version, defaults to v1
4. root SNMP node, defaults to '1'

SNMP library info: http://luasnmp.luaforge.net/
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MarcusH Offline
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#45
21.02.2020, 07:47 (This post was last modified: 21.02.2020, 07:50 by MarcusH.)
Success today! I made a post in this thread https://forum.logicmachine.net/showthread.php?tid=2371

Now i understand the script from this thread. My next question is how to read out the number, i've read out values from tables before, but on this one im a bit stuck.
I get this result and i want to read out the number to a grp address. i see that you use an other way to read it earlier in this thread, but from my knowledge i can do it from this scrip as well.

Code:
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res, err = walk('192.168.1.252', 'public', snmp.SNMPv1, '1.3.6.1.4.1.318.1.1.26.6.3.1.6') log(res, err) if type(res) == 'table' then   voltage = res.????? log(voltage)   end


[Image: 4i9Se4X.png]
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admin Offline
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#46
21.02.2020, 08:22
walk is needed when you want to finds all sub-OIDs within a sub-tree.
Have a look at this example:
https://forum.logicmachine.net/showthrea...51#pid9651
You just need to provide device IP and OID to group address mapping. Script will then handle reading.
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MarcusH Offline
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#47
21.02.2020, 08:25 (This post was last modified: 21.02.2020, 08:27 by MarcusH.)
Got it Blush Blush
Code:
12345678910
res, err = walk('192.168.1.252', 'public', snmp.SNMPv1, '1.3.6.1.4.1.318.1.1.26.6.3.1.6') log(res, err) if type(res) == 'table' then   voltage = res["1.3.6.1.4.1.318.1.1.26.6.3.1.6.1"] log(voltage)   end
(21.02.2020, 08:22)admin Wrote: walk is needed when you want to finds all sub-OIDs within a sub-tree.
Have a look at this example:
https://forum.logicmachine.net/showthrea...51#pid9651
You just need to provide device IP and OID to group address mapping. Script will then handle reading.
 
Ahh okey, this is an way easier way then. Thanks
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DGrandes Offline
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#48
06.03.2020, 11:35 (This post was last modified: 06.03.2020, 11:37 by DGrandes.)
Hi,

I have a problem with counter64 data type. I can log it but it hasn´t data type and I can´t write in an object.
What can I do??

   


This one works fine:

   

Thanks
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admin Offline
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#49
06.03.2020, 12:26
Use 29. 8 byte signed integer
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DGrandes Offline
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#50
06.03.2020, 18:01 (This post was last modified: 06.03.2020, 18:01 by DGrandes.)
I´ve use it but update a "0" in the object.

   
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admin Offline
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#51
06.03.2020, 18:47
Change object data type to string and check what you get there
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DGrandes Offline
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#52
06.03.2020, 18:50 (This post was last modified: 06.03.2020, 18:50 by DGrandes.)
I´ve tried it too but the same. I haven´t get nothing.
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admin Offline
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#53
07.03.2020, 13:20
Post full script that you are using to read values
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DGrandes Offline
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#54
08.03.2020, 17:22 (This post was last modified: 08.03.2020, 17:37 by DGrandes.)
(07.03.2020, 13:20)admin Wrote: Post full script that you are using to read values
Code:
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local IP_Mikrotik = "192.168.2.1" local OID_Mikrotik = {   {'38/5/1',".1.3.6.1.2.1.25.2.3.1.5.65536"}, --Total Memowy   {'38/5/2',".1.3.6.1.2.1.25.2.3.1.6.65536"}, --Used-Memory   {'38/5/3',".1.3.6.1.2.1.25.3.3.1.2.1"}, --CPU Frecuency   {'38/5/5',".1.3.6.1.4.1.14988.1.1.3.14.0"}, --Carga CPU   {'38/5/11',".1.3.6.1.4.1.14988.1.1.14.1.1.2.1"}, --Interface 1 Name   {'38/5/12',".1.3.6.1.4.1.14988.1.1.14.1.1.2.2"}, --Interface 2 Name   {'38/5/13',".1.3.6.1.4.1.14988.1.1.14.1.1.2.3"}, --Interface 3 Name   {'38/5/14',".1.3.6.1.4.1.14988.1.1.14.1.1.2.4"}, --Interface 4 Name   {'38/5/15',".1.3.6.1.4.1.14988.1.1.14.1.1.2.5"}, --Interface 5 Name   {'38/5/16',".1.3.6.1.4.1.14988.1.1.14.1.1.2.6"}, --Interface 6 Name   {'38/5/17',".1.3.6.1.4.1.14988.1.1.14.1.1.2.7"}, --Interface 7 Name   {'38/5/21',".1.3.6.1.4.1.14988.1.1.14.1.1.11.1"}, --Interface 1 TX bytes   {'38/5/22',".1.3.6.1.4.1.14988.1.1.14.1.1.11.2"}, --Interface 2 TX bytes   {'38/5/23',".1.3.6.1.4.1.14988.1.1.14.1.1.11.3"}, --Interface 3 TX bytes   {'38/5/24',".1.3.6.1.4.1.14988.1.1.14.1.1.11.4"}, --Interface 4 TX bytes   {'38/5/25',".1.3.6.1.4.1.14988.1.1.14.1.1.11.5"}, --Interface 5 TX bytes   {'38/5/26',".1.3.6.1.4.1.14988.1.1.14.1.1.11.6"}, --Interface 6 TX bytes   {'38/5/27',".1.3.6.1.4.1.14988.1.1.14.1.1.11.7"}, --Interface 7 TX bytes   {'38/5/31',".1.3.6.1.4.1.14988.1.1.14.1.1.13.1"}, --Interface 1 RX bytes   {'38/5/32',".1.3.6.1.4.1.14988.1.1.14.1.1.13.2"}, --Interface 2 RX bytes   {'38/5/33',".1.3.6.1.4.1.14988.1.1.14.1.1.13.3"}, --Interface 3 RX bytes   {'38/5/34',".1.3.6.1.4.1.14988.1.1.14.1.1.13.4"}, --Interface 4 RX bytes   {'38/5/35',".1.3.6.1.4.1.14988.1.1.14.1.1.13.5"}, --Interface 5 RX bytes   {'38/5/36',".1.3.6.1.4.1.14988.1.1.14.1.1.13.6"}, --Interface 6 RX bytes   {'38/5/37',".1.3.6.1.4.1.14988.1.1.14.1.1.13.7"}, --Interface 7 RX bytes   {'38/5/0',".1.3.6.1.2.1.2.2.1.8.1"}, --Interface 1 Up/Down (Para saber si ISP esta activo } ups1, err = snmp.open{   version = snmp.SNMPv1,   community = "MonitoreoLM",   port = 161,   peer = IP_Mikrotik, } assert(ups1, err) for _, item in ipairs(OID_Mikrotik) do   vbind, err = ups1:get(item[2])   if vbind then     --log(item[1],vbind.value)     grp.checkupdate(item[1], vbind.value)    else     alert('error reading from snmp: ' .. tostring(err))   end end ups1:close()
Solved!. If I convert it to string and again to number it works.

Thanks!
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admin Offline
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#55
09.03.2020, 09:21
Write does not work because SNMP lib uses a special "container" type instead of numbers to store 64-bit values. This will be changed in new versions but for now your approach with tostring/tonumber is correct.
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AlexLV Offline
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#56
27.03.2020, 18:43 (This post was last modified: 27.03.2020, 19:29 by AlexLV.)
Hi,

..admin wrote: ...but for now your approach with tostring/tonumber is correct. How to do it in example above? As I see no all values should be converted tostring/tonumber, just values with digits. Can you explain a little more? I tried to test example above, and I have instead of digital values just zeros...

BR,

Alex
I added conversion for line 45:

grp.checkupdate(item[1], tonumber(tostring(vbind.value)))

but in such case I received all digital values, all strings = nil of course.. How automate this, not to write conversion separately to every line with digit values?

Alex
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AlexLV Offline
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#57
28.03.2020, 09:33
Finally I found how do it working.

Code:
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require "snmp" local IP_Mikrotik = "192.168.10.1" local OID_Mikrotik = {   {'38/5/1',".1.3.6.1.2.1.25.2.3.1.5.65536"}, --Total Memowy   {'38/5/2',".1.3.6.1.2.1.25.2.3.1.6.65536"}, --Used-Memory   {'38/5/3',".1.3.6.1.2.1.25.3.3.1.2.1"}, --CPU Frecuency   {'38/5/5',".1.3.6.1.4.1.14988.1.1.3.14.0"}, -- CPU Load   {'38/5/11',".1.3.6.1.4.1.14988.1.1.14.1.1.2.1"}, --Interface 1 Name   {'38/5/12',".1.3.6.1.4.1.14988.1.1.14.1.1.2.2"}, --Interface 2 Name   {'38/5/13',".1.3.6.1.4.1.14988.1.1.14.1.1.2.3"}, --Interface 3 Name   {'38/5/14',".1.3.6.1.4.1.14988.1.1.14.1.1.2.4"}, --Interface 4 Name   {'38/5/15',".1.3.6.1.4.1.14988.1.1.14.1.1.2.5"}, --Interface 5 Name   {'38/5/16',".1.3.6.1.4.1.14988.1.1.14.1.1.2.6"}, --Interface 6 Name   {'38/5/17',".1.3.6.1.4.1.14988.1.1.14.1.1.2.7"}, --Interface 7 Name   {'38/5/21',".1.3.6.1.4.1.14988.1.1.14.1.1.11.1"}, --Interface 1 TX bytes   {'38/5/22',".1.3.6.1.4.1.14988.1.1.14.1.1.11.2"}, --Interface 2 TX bytes   {'38/5/23',".1.3.6.1.4.1.14988.1.1.14.1.1.11.3"}, --Interface 3 TX bytes   {'38/5/24',".1.3.6.1.4.1.14988.1.1.14.1.1.11.4"}, --Interface 4 TX bytes   {'38/5/25',".1.3.6.1.4.1.14988.1.1.14.1.1.11.5"}, --Interface 5 TX bytes   {'38/5/26',".1.3.6.1.4.1.14988.1.1.14.1.1.11.6"}, --Interface 6 TX bytes   {'38/5/27',".1.3.6.1.4.1.14988.1.1.14.1.1.11.7"}, --Interface 7 TX bytes   {'38/5/31',".1.3.6.1.4.1.14988.1.1.14.1.1.13.1"}, --Interface 1 RX bytes   {'38/5/32',".1.3.6.1.4.1.14988.1.1.14.1.1.13.2"}, --Interface 2 RX bytes   {'38/5/33',".1.3.6.1.4.1.14988.1.1.14.1.1.13.3"}, --Interface 3 RX bytes   {'38/5/34',".1.3.6.1.4.1.14988.1.1.14.1.1.13.4"}, --Interface 4 RX bytes   {'38/5/35',".1.3.6.1.4.1.14988.1.1.14.1.1.13.5"}, --Interface 5 RX bytes   {'38/5/36',".1.3.6.1.4.1.14988.1.1.14.1.1.13.6"}, --Interface 6 RX bytes   {'38/5/37',".1.3.6.1.4.1.14988.1.1.14.1.1.13.7"}, --Interface 7 RX bytes   {'38/5/0',".1.3.6.1.2.1.2.2.1.8.1"}, --Interface 1 Up/Down (To find out if ISP is active) } ups1, err = snmp.open{   version = snmp.SNMPv1,   community = "public",   port = 161,   peer = IP_Mikrotik, } assert(ups1, err) for _, item in ipairs(OID_Mikrotik) do   vbind, err = ups1:get(item[2])   if vbind then if tonumber(tostring(vbind.value)) ~=nil then       grp.checkupdate(item[1], tonumber(tostring(vbind.value))) --- Here we receive correct digital values     --log(item[1],vbind.value) else     grp.checkupdate(item[1], vbind.value) --- Here we receive correct string values   end   else     alert('error reading from snmp: ' .. tostring(err))   end end ups1:close()
thanks to admin, he gives us solutions or ways where to possible find answers..
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admin Offline
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#58
28.03.2020, 15:06
A more correct approach of handling counter64 type values:
Code:
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if vbind then   value = vbind.value   if type(value) == 'userdata' then     value = tonumber(tostring(value))   end   if value ~= nil then     grp.checkupdate(item[1], value)   end else   alert('error reading from snmp: ' .. tostring(err)) end
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AlexLV Offline
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#59
11.04.2020, 21:10
Hi,
how integrate to last more correct script addon, if data type = "table"
I wanted to add router uptime value, and in log I see it such way:

* arg: 1
* string: 38/5/6
* arg: 2
* table:
["minutes"]
* number: 0
["deciseconds"]
* number: 0
["days"]
* number: 0
["ticks"]
* number: 2165600
["seconds"]
* number: 56
["hours"]
* number: 6

BR,

Alex
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admin Offline
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#60
12.04.2020, 12:12
This will convert table value to a string (for example: 1d 06h 42m).
Code:
123
if type(value) == 'table' then   value = string.format('%dd %02dh %02dm', value.days or 0, value.hours or 0, value.minutes or 0) end
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