SET OctetString support about gosnmp HOT 11 CLOSED

👍 Thanks MrSpock. Yes it's a feature I'd like to add, I'll keep this issue open. We're all pretty busy (you, me, others on the gosnmp project). Perhaps you'd like to submit a pull request? Otherwise I'll get onto this when I next have a holiday :-)

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PS Would you mind sending a couple of packet captures of doing some SNMP string sets? That would help for developing the code (TDD - Test Driven Development).

How to do packet captures is detailed in the readme.

Thanks, Sonia.

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Sonia,
I have few days of holiday and I'm already sitting with wireshark pcap files from my SNMP session and maybe I will submit push request before your next holidays :)

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Sonia,
Since I needed this really hard after ~1.5h with tcpdump and wireshark I made it :)
I've made code for SNMP Set OctetString and String (they are the same on PDU layer since string is sent as bytes).
It works for me and you can set either Octet String (not always printable chars you have to send) or strings.
Example when creating SnmpPDU:
// set string
pdu := []gosnmp.SnmpPDU{gosnmp.SnmpPDU{oid, gosnmp.OctetString, "foo"}}
// set bytes (not necessary readable string. Any 0x0-0xff is ok in SNMP OctetString)
pdu := []gosnmp.SnmpPDU{gosnmp.SnmpPDU{oid, gosnmp.OctetString, []byte{0x62, 0x61, 0x72}}}

I made pull request.

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Thanks Marcin, I'm working on the patch at the moment. The pcap file - would you mind emailing it to me ([email protected]) or putting it somewhere I can download it?

I like to use TDD for gosnmp - catch all those corner cases. I'll use the pcap file to write a test.

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Sonia,
First pcap is from native Linux snmputils snmpset and it sends 4 sets -two integers and two OctetStrings:
https://dl.dropboxusercontent.com/u/7660386/github/snmpset_native.pcap
Second is from my code (example used http://pastebin.com/WBW02b5F )
Here is pcap file:
https://dl.dropboxusercontent.com/u/7660386/github/snmpset_go.pcap

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Thanks!

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See also #30

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Hi Marcin, would you mind doing the following, to make writing the tests easier:

• do the snmpset as one command (ie set 4 values at once), rather than 4 separate sets
• tell me what the snmpset commandline is, so I can see what types and what expected values are being used. For example see [1], but use v2c, numeric options rather than ascii for OIDs, and not the equals format. For example snmpset -c private -v 1 test-hub system.sysContact.0 s [email protected] gers.edu ip.ipforwarding.0 = 2
• send me a URL to the pcap for that

Thanks very much for your help :-)

[1] http://www.linuxcommand.org/man_pages/snmpset1.html

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Sonia,

Here is command:
snmpset -c private -v2c 10.80.0.14 .1.3.6.1.4.1.2863.205.10.1.33.2.5.1.2.2 i 5001 .1.3.6.1.4.1.2863.205.10.1.33.2.5.1.3.2 i 5001 .1.3.6.1.4.1.2863.205.10.1.33.2.5.1.4.2 i 2 .1.3.6.1.4.1.2863.205.10.1.33.2.5.1.5.2 i 1

Here is resulted file.

https://dl.dropboxusercontent.com/u/7660386/github/snmp_multiset.pcap

I don't know why snmpset repeates queries. Device which receives them respond slow so maybe this is somehow related to timeout. However packet content is ok and this is nice example of multiple varbinds in one packet.

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Thanks very much! Tests written, merged. Would you mind sending a pcap for a couple of ipaddress sets and and the snmpset command line, so I can write the tests :-)

(I've rebased your set_ipaddress branch)

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