Hello all,
I have written the following test code to verify how to register a handler for
an OID in a subagent using the AgentX protocol. Despite the API return success
I never see the handler invoked for the OID, nor do I see a packet delivered to
subagent.
I'm guessing I either I am utilizing the API incorrectly, or I am missing a
critical step. I have poured through the documentation I can find online, with
little success.
Also are there any books on writing subagents? Search of Amazon showed no
obvious titles.
Thanks in advance, Marc
=== BEGIN CODE ===
#include <assert.h>
#include <signal.h>
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#define SUBAGENT_NAME "testrig"
static netsnmp_handler_registration *reginfo;
static int keep_running = 1;
void stop_server(int sig)
{
keep_running = 0;
}
int handler(netsnmp_mib_handler *handler,
netsnmp_handler_registration *reginfo,
netsnmp_agent_request_info *reqinfo,
netsnmp_request_info *requests)
{
assert(0);
puts("Handler called.");
return -1;
}
int register_oid()
{
oid oid1[] = { 1, 3, 6, 1, 2, 1, 27, 2 };
int rc;
reginfo = netsnmp_create_handler_registration("handler",
handler,
oid1,
OID_LENGTH(oid1),
HANDLER_CAN_RWRITE);
if (!reginfo) {
puts("Failed to register handler.");
return 0;
}
rc = netsnmp_register_instance(reginfo);
switch (rc) {
case MIB_REGISTERED_OK:
puts("Handler successfully registered.");
break;
case MIB_REGISTRATION_FAILED:
puts("Handler registration failed.");
return 0;
break;
case MIB_DUPLICATE_REGISTRATION:
puts("Handler reigstration failed - duplicate.");
return 0;
break;
}
return 1;
}
void unregister_oid()
{
int rc;
rc = netsnmp_unregister_handler(reginfo);
printf("unregister rc=%d\n", rc);
reginfo = NULL;
}
void main_loop()
{
int pktcount;
while (keep_running) {
pktcount = agent_check_and_process(1);
printf("Processed %d packets.\n", pktcount);
}
}
int main(int argc, char *argv[])
{
int rc;
snmp_enable_stderrlog();
netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_AGENT_ROLE, 1);
netsnmp_ds_set_string(NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_AGENT_X_SOCKET,
"/tmp/agentx");
netsnmp_ds_set_int(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_AGENTX_PING_INTERVAL, 15);
rc = init_agent(SUBAGENT_NAME);
assert(rc == 0);
puts("Connected as subagent.");
if (!register_oid()) {
puts("Failed to register oid.");
exit(1);
}
keep_running = 1;
signal(SIGTERM, stop_server);
signal(SIGINT, stop_server);
main_loop();
unregister_oid();
snmp_shutdown(SUBAGENT_NAME);
return 0;
}
=== END CODE ===
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