I am trying to attach a MIB Module into my C++ program. Making it an AgentX
subagent. Any help/suggestion is appreciated.
I followed the MIB Module Tutorial on Net-SNMP, created myself a MIB module
with 3 scalars.
Then running the command net-snmp-config --compile-subagent mysnmp mysnmp.c
Executing the following snmpget localhost -v2c -c public
1.3.6.1.4.1.40463.1.1.0
And it output a test string I hard coded into mysnmp MIB module. Worked fine.
snmpget localhost -v2c -c public 1.3.6.1.4.1.40463.1.1.0
SNMPv2-SMI::enterprises.40463.1.1.0 = STRING: "mysnmp"
I have baked Net-SNMP into my C++ program (trying to make my C++ program an
AgentX subagent). To check if it worked like an AgentX, I just used the same
MIB module from my mysnmp I made following the tutorial. Move the code from
mysnmp.c into myclient.cpp. Compiled fine, ran fine, but did not get any result
back.
snmpget localhost -v2c -c public 1.3.6.1.4.1.40463.1.1.0
SNMPv2-SMI::enterprises.40463.1.1.0 = No Such Object available on this agent at
this OID
I have put the following Net-SNMP initialization code in my main:
main.cpp
int background = 0; // change this if you want to run in the background.
int syslog = 0; // change this if you want to use syslog.
// print log errors to syslog or stderr.
if (syslog)
snmp_enable_calllog();
else
snmp_enable_stderrlog();
// make us a agentx client.
netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_AGENT_ROLE, 1);
// run in background, if requested.
if (background && netsnmp_daemonize(1, !syslog)) { exit(1); }
// initialize tcpip, if necessary.
SOCK_STARTUP;
// initialize the agent library.
init_agent("my-snmp-deamon");
myclient client;
client.run();
myclient.cpp
extern "C" {
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
void init_vacm_vars();
void init_usmUser();
Netsnmp_Node_Handler handle_snmp;
}
const oid mysnmp_oid[] = { 1,3,6,1,4,1,40463,1 };
const oid mysnmpInfo_oid[] = { 1,3,6,1,4,1,40463,1,1 };
const oid mysnmpPlacementCountry_oid[] = { 1,3,6,1,4,1,40463,1,2 };
con st oid mysnmpCounter_oid[] = { 1,3,6,1,4,1,40463,1,3 };
myclient::myclient() :
_mainloop(Glib::MainLoop::create())
{
netsnmp_register_scalar_group(
netsnmp_create_handler_registration("mysnmp",
handle_snmp,
group_oid,
OID_LENGTH(group_oid),
HANDLER_CAN_RONLY
), 1, 3);
//Runs the Main Event Loop
Glib::signal_idle().connect(
sigc::bind_return(sigc::mem_fun(*this, &myclient::mainloop), true)
);
}
void myclient::run() {
_mainloop->run(); //Running Main Event Loop
}
myclient::mainloop() {
if (_snmp_ready) {
agent_check_and_process(1); /* 0 == don't block */
}
}
int
handle_snmp(netsnmp_mib_handler *handler,
netsnmp_handler_registration *reginfo,
netsnmp_agent_request_info *reqinfo,
netsnmp_request_info *requests) {
void* datapointer;
char buffer[200];
int dataint;
int length = 0;
u_char type;
const oid* request_oid = (*reginfo).rootoid;
if (netsnmp_oid_equals(request_oid, 9, mysnmpInfo_oid, 9) == 0) { //OID_LENGTH(
mysnmpInfo_oid )
strcpy(buffer, "mysnmp");
datapointer = buffer;
length = strlen(buffer);
type = ASN_OCTET_STR;
} else if (netsnmp_oid_equals(request_oid, 9, mysnmpPlacementCountry_oid, 9) ==
0) {
strcpy(buffer, "mysnmp2");
datapointer = buffer;
length = strlen(buffer);
type = ASN_OCTET_STR;
} else if (netsnmp_oid_equals(request_oid, 9, mysnmpCounter_oid, 9) == 0) {
dataint = 1234;
datapointer = &dataint;
length = sizeof(dataint);
type = ASN_INTEGER;
} else {
strcpy(buffer, "UNKNOWN_OID");
datapointer = buffer;
length = strlen(buffer);
type = ASN_OCTET_STR;
}
switch(reqinfo->mode) {
case MODE_GET:
snmp_set_var_typed_value(requests->requestvb,
type,
datapointer,
length);
break;
default:
/* we should never get here, so this is a really bad error */
snmp_log(LOG_ERR, "unknown mode (%d) in handle_snmp\n", reqinfo->mode );
return SNMP_ERR_GENERR;
}
return SNMP_ERR_NOERROR;
}
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