Hi,
I am using VC++6.0 in windows to extend the netsnmp agent. I am
getting a link error. I understand that I have not included the
appropriate header files. Code is attached. What header files should be
included for the agent to work properly.
Thanks and Regards,
S.Jega
snmp.lib - 0 error(s), 0 warning(s)
--------------------Configuration: libsnmp - Win32
Debug--------------------
--------------------Configuration: encode_keychange - Win32
Release--------------------
Compiling...
panduitAppsLED.c
Linking...
panduitAppsLED.obj : error LNK2001: unresolved external symbol
_netsnmp_register_scalar
panduitCommon.obj : error LNK2001: unresolved external symbol
_netsnmp_register_scalar
panduitAppsLED.obj : error LNK2001: unresolved external symbol
_netsnmp_create_handler_registration
panduitCommon.obj : error LNK2001: unresolved external symbol
_netsnmp_create_handler_registration
panduitAppsLED.obj : error LNK2001: unresolved external symbol
_netsnmp_request_get_list_data
panduitAppsLED.obj : error LNK2001: unresolved external symbol
_netsnmp_request_add_list_data
panduitAppsLED.obj : error LNK2001: unresolved external symbol
_netsnmp_set_request_error
--------------------Configuration: snmpd - Win32
Release--------------------
Linking...
netsnmpmibs.lib(mib_modules.obj) : error LNK2001: unresolved external
symbol _init_panduitAppsLED
../bin/release/snmpd.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
snmpd.exe - 2 error(s), 0 warning(s)
Sample Code is attached
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include "C:\usr\include\net-snmp\agent\instance.h"
#include "panduitAppsLED.h"
//#include <unistd.h>
struct panduitApps
{
int portled;
int systemled;
}struct_obj;
FILE *fp;
char
led_fname[110]="D:\\Jegan\\downloads\\jegan\\AJack\\panduitAppsLED\\file.properties";
/** Purpose of the function create_panduitApps() is to check for the
**property file existence and to initialize the OIDs which
**have READ_WRITE Permissions
**/
void create_panduitApps()
{
//Check for property file existence
fp = fopen(led_fname,"w");
struct_obj.portled=1;
struct_obj.systemled=1;
fwrite(&struct_obj,sizeof(struct panduitApps),1,fp);
fclose(fp);
} // End of Function create_panduitApps()
/** Initializes the panduitAppsLED module */
void
init_panduitAppsLED(void)
{
static oid panduitLEDPortLedPeriod_oid[] =
{ 1, 3, 6, 1, 4, 1, 19536, 7, 4, 2 };
static oid panduitLEDSystemLedPeriod_oid[] =
{ 1, 3, 6, 1, 4, 1, 19536, 7, 4, 4 };
DEBUGMSGTL(("panduitAppsLED", "Initializing\n"));
netsnmp_register_scalar(
netsnmp_create_handler_registration("panduitLEDPortLedPeriod",handle_panduitLEDPortLedPeriod,panduitLEDPortLedPeriod_oid,OID_LENGTH(panduitLEDPortLedPeriod_oid),HANDLER_CAN_RWRITE));
netsnmp_register_scalar(netsnmp_create_handler_registration("panduitLEDSystemLedPeriod",handle_panduitLEDSystemLedPeriod,panduitLEDSystemLedPeriod_oid,OID_LENGTH(panduitLEDSystemLedPeriod_oid),HANDLER_CAN_RWRITE));
}
int
handle_panduitLEDPortLedPeriod(netsnmp_mib_handler *handler,
netsnmp_handler_registration *reginfo,
netsnmp_agent_request_info *reqinfo,
netsnmp_request_info *requests)
{
// create_panduitApps();
static int *cache=NULL;
#define LED "led"
/*
* We are never called for a GETNEXT if it's registered as a
* "instance", as it's "magically" handled for us.
*/
/*
* a instance handler also only hands us one request at a time, so
* we don't need to loop over a list of requests; we'll only get
one.
*/
switch (reqinfo->mode) {
case MODE_GET:
fp=fopen(led_fname,"r");
if(!fp)
printf ("File cannot be opened in
handle_panduitLEDPortLedPeriod:MODE_GET\n");
fseek(fp,sizeof(struct panduitApps),SEEK_SET);
fread(&struct_obj,sizeof(struct panduitApps),1,fp);
snmp_set_var_typed_value(requests->requestvb, ASN_INTEGER,
(u_char *)&struct_obj.portled
/* XXX: a pointer to the scalar's data
*/
,sizeof(struct_obj.portled)
/*
* XXX: the length of the data in bytes
*/ );
fclose(fp);
break;
/*
* SET REQUEST
*
* multiple states in the transaction. See:
*
http://www.net-snmp.org/tutorial-5/toolkit/mib_module/set-actions.jpg
*/
case MODE_SET_RESERVE1:
if ( requests->requestvb->type != ASN_INTEGER /* XXX: check
incoming data in requests->requestvb->val.XXX for failures, like an
incorrect type or an illegal value or ... */ ) {
netsnmp_set_request_error(reqinfo,
requests,SNMP_ERR_WRONGTYPE
/* XXX: set error code depending
on problem (like SNMP_ERR_WRONGTYPE or SNMP_ERR_WRONGVALUE or ... */
);
}
break;
case MODE_SET_RESERVE2:
fp=fopen(led_fname,"r");
if(!fp)
printf ("File cannot be opened in
handle_panduitLEDPortLedPeriod:MODE_SET_RESERVE2\n");
fseek(fp,sizeof(struct panduitApps),SEEK_SET);
fread(&struct_obj,sizeof(struct panduitApps),1,fp);
/*
* XXX malloc "undo" storage buffer
*/
memdup((u_char **) &cache,(u_char *)
&struct_obj.portled,sizeof(struct_obj.portled));
if (cache == NULL /* XXX if malloc, or whatever, failed: */ ) {
netsnmp_set_request_error(reqinfo, requests,
SNMP_ERR_RESOURCEUNAVAILABLE);
}
netsnmp_request_add_list_data(requests,netsnmp_create_data_list(LED,cache,free));
fclose(fp);
break;
case MODE_SET_FREE:
/*
* XXX: free resources allocated in RESERVE1 and/or
* RESERVE2. Something failed somewhere, and the states
* below won't be called.
*/
break;
case MODE_SET_ACTION:
fp=fopen(led_fname,"r+");
if(!fp)
printf ("File cannot be opened in
handle_panduitLEDPortLedPeriod:MODE_SET_ACTION\n");
fseek(fp,sizeof(struct panduitApps),SEEK_SET);
fread(&struct_obj,sizeof(struct panduitApps),1,fp);
/*
* XXX: perform the value change here
*/
struct_obj.portled=*(requests->requestvb->val.integer);
DEBUGMSGTL(("LED", "updated portled_period value ->
%d\n",struct_obj.portled));
fseek(fp,sizeof(struct panduitApps),SEEK_SET);
fwrite(&struct_obj,sizeof(struct panduitApps),1,fp);
/*if ( XXX: error? ) {
netsnmp_set_request_error(reqinfo, requests, some error
);
}*/
fclose(fp);
break;
case MODE_SET_COMMIT:
break;
case MODE_SET_UNDO:
/*
* XXX: UNDO and return to previous value for the object
*/
fp=fopen(led_fname,"r+");
if(!fp)
printf ("File cannot be opened in
handle_panduitLEDPortLedPeriod:MODE_SET_UNDO\n");
fseek(fp,sizeof(struct panduitApps),SEEK_SET);
fread(&struct_obj,sizeof(struct panduitApps),1,fp);
struct_obj.portled=*((u_long
*)netsnmp_request_get_list_data(requests,LED));
fseek(fp,sizeof(struct panduitApps),SEEK_SET);
fwrite(&struct_obj,sizeof(struct panduitApps),1,fp);
fclose(fp);
break;
default:
/*
* we should never get here, so this is a really bad error
*/
snmp_log(LOG_ERR,
"unknown mode (%d) in
handle_panduitLEDPortLedPeriod\n",
reqinfo->mode);
return SNMP_ERR_GENERR;
}
return SNMP_ERR_NOERROR;
}
int
handle_panduitLEDSystemLedPeriod(netsnmp_mib_handler *handler,
netsnmp_handler_registration *reginfo,
netsnmp_agent_request_info *reqinfo,
netsnmp_request_info *requests)
{
// create_panduitApps();
/*
* We are never called for a GETNEXT if it's registered as a
* "instance", as it's "magically" handled for us.
*/
/*
* a instance handler also only hands us one request at a time, so
* we don't need to loop over a list of requests; we'll only get
one.
*/
static int *cache = NULL;
#define SYSTEM "SYSTEM"
switch (reqinfo->mode) {
case MODE_GET:
fp=fopen(led_fname,"r");
if(!fp)
printf ("File cannot be opened in
handle_panduitLEDSystemLedPeriod:MODE_GET\n");
fseek(fp,sizeof(struct panduitApps),SEEK_SET);
fread(&struct_obj,sizeof(struct panduitApps),1,fp);
snmp_set_var_typed_value(requests->requestvb, ASN_INTEGER,
(u_char *) &struct_obj.systemled
/* XXX: a pointer to the scalar's data
*/
,sizeof(struct_obj.systemled)
/*
* XXX: the length of the data in bytes
*/ );
break;
/*
* SET REQUEST
*
* multiple states in the transaction. See:
*
http://www.net-snmp.org/tutorial-5/toolkit/mib_module/set-actions.jpg
*/
case MODE_SET_RESERVE1:
if ( requests->requestvb->type != ASN_INTEGER /* XXX: check
incoming data in requests->requestvb->val.XXX for failures, like an
incorrect type or an illegal value or ... */ ) {
netsnmp_set_request_error(reqinfo,
requests,SNMP_ERR_WRONGTYPE
/* XXX: set error code depending
on problem (like SNMP_ERR_WRONGTYPE or SNMP_ERR_WRONGVALUE or ... */
);
}
break;
case MODE_SET_RESERVE2:
fp=fopen(led_fname,"r");
if(!fp)
printf ("File cannot be opened in
handle_panduitLEDSystemLedPeriod:MODE_SET_RESERVE2\n");
fseek(fp,sizeof(struct panduitApps),SEEK_SET);
fread(&struct_obj,sizeof(struct panduitApps),1,fp);
/*
* XXX malloc "undo" storage buffer
*/
memdup( (u_char **) &cache, (u_char *) &struct_obj.systemled,
sizeof(struct_obj.systemled) );
if ( cache == NULL /* XXX if malloc, or whatever, failed: */ ) {
netsnmp_set_request_error(reqinfo, requests,
SNMP_ERR_RESOURCEUNAVAILABLE);
}
netsnmp_request_add_list_data(requests,
netsnmp_create_data_list(SYSTEM,cache,free));
fclose(fp);
break;
case MODE_SET_FREE:
/*
* XXX: free resources allocated in RESERVE1 and/or
* RESERVE2. Something failed somewhere, and the states
* below won't be called.
*/
break;
case MODE_SET_ACTION:
fp=fopen(led_fname,"r+");
if(!fp)
printf ("File cannot be opened in
handle_panduitLEDSystemLedPeriod:MODE_SET_ACTION\n");
fseek(fp,sizeof(struct panduitApps),SEEK_SET);
fread(&struct_obj,sizeof(struct panduitApps),1,fp);
/*
* XXX: perform the value change here
*/
struct_obj.systemled= *(requests->requestvb->val.integer);
DEBUGMSGTL(("LED", "updated systemled_period value ->
%d\n",struct_obj.systemled));
fseek(fp,sizeof(struct panduitApps),SEEK_SET);
fwrite(&struct_obj,sizeof(struct panduitApps),1,fp);
fclose(fp);
break;
case MODE_SET_COMMIT:
/*
* XXX: delete temporary storage
*/
break;
case MODE_SET_UNDO:
/*
* XXX: UNDO and return to previous value for the object
*/
fp=fopen(led_fname,"r+");
if(!fp)
printf ("File cannot be opened in
handle_panduitLEDSystemLedPeriod:MODE_SET_UNDO\n");
fseek(fp,sizeof(struct panduitApps),SEEK_SET);
fread(&struct_obj,sizeof(struct panduitApps),1,fp);
struct_obj.systemled=*((u_long
*)netsnmp_request_get_list_data(requests,SYSTEM));
fseek(fp,sizeof(struct panduitApps),SEEK_SET);
fwrite(&struct_obj,sizeof(struct panduitApps),1,fp);
fclose(fp);
break;
default:
/*
* we should never get here, so this is a really bad error
*/
snmp_log(LOG_ERR,
"unknown mode (%d) in
handle_panduitLEDSystemLedPeriod\n",
reqinfo->mode);
return SNMP_ERR_GENERR;
}
return SNMP_ERR_NOERROR;
}
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