Hello,
I'm discovering SNMP C programmation and I've developped the following program,
with the help of NET-SNMP tutorial. It's almost the same code as tuto's code,
but which is running in localhost (or 127.0.0.1). It doesn't work, but the
tuto's application works fine !
When I compile and run the application, but instead of having an object value
(like a STRING or INTEGER), it displays :
.1702326096.1952796274.1112100141.1886730810.1935753843.1968137065.1953853556.1952543827.841905013.0.990059265.36.3.4294966456
PowerNet-MIB::upsBasicOutputStatus.0 = Wrong Type (should be INTEGER): NULL
PowerNet-MIB::upsBasicOutputStatus.2 = Wrong Type (should be INTEGER): NULL
I tried so many solutions, but nothing I found can fix this "wrong type" error.
I understand the whole code (each of its line), but I can't find the reason
that
make it doesn't work. I guess it comes from SNMP in general (or NET-SNMP), but
I'm newbie with this protocol, so I really don't know.
My goal is just to display the value of an object from a personal MIB ("home
made"), but for now I'm working with tools from tutorial ().
Have you any idea ?
thanks to everyone.
----------------------------------
C Code :: with "localhost" parameter
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <string.h>
int main(int argc, char ** argv)
{
struct snmp_session session;
struct snmp_session *sess_handle;
struct snmp_pdu *pdu;
struct snmp_pdu *response;
struct variable_list *vars;
oid id_oid[MAX_OID_LEN];
oid serial_oid[MAX_OID_LEN];
size_t id_len = MAX_OID_LEN;
size_t serial_len = MAX_OID_LEN;
int status;
struct tree * mib_tree;
/*********************/
init_mib();
if(argv[1] == NULL){
printf("Please supply a hostname\n");
exit(1);
}
init_snmp("test_PowerNet");
snmp_sess_init( &session );
session.version = SNMP_VERSION_1;
session.community = "public";
session.community_len = strlen(session.community);
session.peername = argv[1];
sess_handle = snmp_open(&session);
add_mibdir(".");
mib_tree = read_mib("NET-SNMP-TUTORIAL-MIB.txt");
pdu = snmp_pdu_create(SNMP_MSG_GET);
read_objid("NET-SNMP-TUTORIAL-MIB::nstAgentModuleObject.0", id_oid,
&id_len);
snmp_add_null_var(pdu, id_oid, id_len);
read_objid("NET-SNMP-TUTORIAL-MIB::nstAgentModuleObject.0", serial_oid,
&serial_len);
snmp_add_null_var(pdu, serial_oid, serial_len);
print_objid("NET-SNMP-TUTORIAL-MIB::nstAgentModuleObject.0",id_len);
/**
*returns :
.1702326096.1952796274.1112100141.1886730810.1935753843.1968137065.1953853556.1952543827.841905013.0.990059265.36.3.4294966464
**/
status = snmp_synch_response(sess_handle, pdu, &response);
for(vars = response->variables; vars; vars = vars->next_variable){
print_variable(vars->name, vars->name_length, vars);
}
snmp_free_pdu(response);
snmp_close(sess_handle);
return (0);
}
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