Hello!
Did anyone face the same behaviour?
Why the retries are not accepted?
What is necessary to do in order to resolve this situation?
Best regards,
Andrei Yahorau
From: Andrei Yahorau/IBA
To: net-snmp-coders@lists.sourceforge.net
Date: 08.05.2020 10:37
Subject: A simple C program which sends v2c informs do not make
retries in case of unavailable destination
Hello Everyone!
I have a question. I want to send SNMP v2c informs using C and net-snmp
module in linux SLES 12.
To do this I created the following simple program where everything comes
to send_trap_to_sess() function :
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
oid objid_sysuptime[] = { 1, 3, 6, 1, 2, 1, 1, 3, 0 };
oid objid_id[] = { 1,3,6,1,4,1,78945,1,1,2,4,0};
oid objid_name[] = { 1,3,6,1,4,1,78945,1,1,2,1,0};
oid trap_oid[] = {1,3,6,1,4,1,78945,1,1,1,1,1};
int main()
{
netsnmp_session session, *ss;
netsnmp_pdu *pdu, *response;
char *trap = NULL;
char comm[] = "public";
snmp_sess_init( &session );
session.version = SNMP_VERSION_2c;
session.community = comm;
session.community_len = strlen(session.community);
session.peername = "192.168.4.10:1234";
session.retries = 3;
session.timeout = 1000;
ss = snmp_open(&session);
if (!ss) {
snmp_sess_perror("ack", &session);
exit(1);
}
pdu = snmp_pdu_create(SNMP_MSG_INFORM);
pdu->community = comm;
pdu->community_len = strlen(comm);
pdu->trap_type = SNMP_TRAP_ENTERPRISESPECIFIC;
long sysuptime;
char csysuptime [20];
sysuptime = get_uptime ();
sprintf (csysuptime, "%ld", sysuptime);
trap = csysuptime;
snmp_add_var (pdu, objid_sysuptime, sizeof (objid_sysuptime)/sizeof
(oid),'t', trap);
snmp_add_var(pdu, trap_oid, OID_LENGTH(trap_oid), 'o',
"1.3.6.1.4.1.78945.1.1.1.1.1");
snmp_add_var(pdu, objid_name, OID_LENGTH(objid_name), 's', "Test Name"
);
snmp_add_var(pdu, objid_id, OID_LENGTH(objid_id) , 'i', "5468");
send_trap_to_sess (ss, pdu);
snmp_close(ss);
return (0);
}
Frankly speaking this is modified part of code taken from
https://stackoverflow.com/questions/30050542/how-to-send-v2-traps-in-net-snmp-using-c
where a user asked how to send snmp v2c trap using C.
Here I modified creation of pdu:
pdu = snmp_pdu_create(SNMP_MSG_INFORM);
and added assignments of retries and timeout values for informs
session.retries = 3;
session.timeout = 1000;
This example works quite well. I see that it sends inform request in
wireshark output. But there is one problem: If the destination is not
available it will not do any retries despite that this is an inform.
Could you please give me a suggestion what I do wrong here?
Thank you in advance.
Best regards,
Andrei Yahorau
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