On 04/21/16 13:42, Wes
Hardaker wrote:Well, because I'm using the utilities from net-snmp (under Win7/64) to test our agent, but the agent itself is running on an ARM9 core, with 96KB RAM and 512KB FLASH.?0?2 I had hand-coded all our existing snmp v1 and v2 support by reverse-engineering Wireshark packet dumps of interactions between net-snmp utilities and net-snmp snmpd running on another machine.?0?2RFC3414 is indeed the exact document you need to read if you're implementing things by hand.Though I might wonder why you're implementing it by hand rather than using something existing (since you're already using net-snmp). Unfortunately, that isn't so simple with the authentication/encryption requirements of v3!!?0?2 So my current plan is to identify the minimum set of functions that I need to extract from net-snmp into our firmware to get this job done. I have merged snmplib/openssl into our firmware, which takes up about 31KB.?0?2 But I definitely cannot pull in all of snmplib itself (over 66,000 lines).?0?2 So I'm tracing snmpget.c, along with the agent, to figure out what the minimum set of functionality that I need to pull in, to handle the auth/encryption, and then link them to my existing hand-coded snmp packet handlers. My current theory is that I should be able to extract generate_Ku() and whatever function it calls, to handle the tasks that I don't already know how to handle, but I've got some further analysis of the agent to go before I'll know if that is reasonable...
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