On Tue, Nov 2, 2021 at 8:17 AM Nishant Nayan <nayan.nishant2...@gmail.com> wrote:
> Hi, > Is there a way to track all function calls along with this > "-Ddumpv,dumph"? > I would like to track function calls made by 'snmpd' when I run snmpget to > query OIDs from other snmp abled device. > You could try -DALL. That doesn't quite track all function calls, but at least it tracks all places where there is any debugging specified. Bill > On Mon, 6 Sept 2021 at 19:26, Bill Fenner <fen...@gmail.com> wrote: > >> On Sun, Sep 5, 2021 at 9:59 AM Nishant Nayan <nayan.nishant2...@gmail.com> >> wrote: >> >>> My aim is to know how various parameters like errorstat and errindex >>> etc. are set from response. >>> >>> For an example command : >>> snmpget -v1 -c cmty_remotehost1 localhost SNMPv2-MIB::sysName.1 >>> SNMPv2-MIB::sysDescr.0 SNMPv2-MIB::sysObjectID.0 >>> >>> SNMPv2-MIB::sysName.1 being an incorrect oid >>> >> >> I like to add "-Ddumpv,dumph" to get details of the messages that are >> being send and received. Try running your get with that debugging to see >> if the output helps you understand where each field comes from. (You can >> change it to just "-Ddump" to also get a hex dump, which you may be able to >> compare with the data field you see in your debugger). >> >> Each field in the packet is encoded using ASN.1, which is more or less a >> type/length/value encoding, but is fairly complex. If you're trying to >> create your own packets, please see if it's feasible to use an existing >> ASN.1 encoder, because there have historically been many bugs in ASN.1 >> parsing and encoding so it's best to use a well-tested implementation. >> >> Also, if you want to know what the SNMP protocol is doing, as opposed to >> what the helpful snmpget command is doing, you should add "-Cf" to the >> snmpget command line - when snmpget gets an error like this, it'll strip >> out the bad object and try again so that it gets the data that may exist, >> but that is not how SNMP works per se - that is how snmpget works. >> >> Bill >> >>
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