Hi there.
First off, apologies for mailing here but I was having little luck from the
users mailing list.
I am writing a trap listener which listens on upd 162. When each trap comes
in I want to grab the source IP address of the device which sent the trap.
My code basically takes snmptrapd.c and stripped it down to essentials -
http://pastebin.com/fbCSQhpc
Now, the trap callback function is where I want to get the client ip
address. I thought 'pdu->agent_addr' would have the ip but I got null form
that.
I also tried:
netsnmp_transport *t = (netsnmp_transport *)(session->callback_magic);
//callback_magic was given the transport variable in the add_session()
function
netsnmp_udp_addr_pair *pp = (netsnmp_udp_addr_pair *)(t->data);
where netsnmp_udp_addr_pair is a struct:
typedef struct netsnmp_udp_addr_pair_s {
struct sockaddr_in remote_addr;
struct in_addr local_addr;
} netsnmp_udp_addr_pair;
But I got nothing from that with t->data_length returning 0.
The somebody suggested getting the sockaddr_in by casting
pdu->transport_data but I got nothing worthwhile after I gave the
sockaddr_in to inet_pton().
I was hoping somebody could point me in the right direction? Can I just
grab the client ip from somewhere?
Thanks,
Tom
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