Dear Mr. /Ms., Hi:
I have a problem (SNMP Get), to seek help, the problem described as
follows:
The main body of the program
(Referencehttp://www.net-snmp.org/tutorial/tutorial-5/toolkit/demoapp/snmpdemoapp.c),
I added a while loop, do SNMPDEMO about 50 times the memory will increase
about 4K, then the memory will continue to increase
External environment:
CentOS5 NET-SNMP 5.5
View memory usage of the command:
# ps -e -o 'pid,comm,args,pcpu,rsz,vsz,stime,user,uid' |grep snmpdemo|grep
-v grep
thanks.
source Code:
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <string.h>
int main(int argc, char ** argv)
{
netsnmp_session session, *ss;
netsnmp_pdu *pdu;
netsnmp_pdu *response;
oid anOID[MAX_OID_LEN];
size_t anOID_len;
netsnmp_variable_list *vars;
int status;
int count=1;
/*
* Initialize the SNMP library
*/
init_snmp("snmpdemoapp");
while (1){ // //new add
/*
* Initialize a "session" that defines who we're going to talk to
*/
snmp_sess_init( &session ); /* set up defaults */
session.peername = strdup("10.10.11.104"); //change
/* set up the authentication parameters for talking to the server */
/* set the SNMP version number */
session.version = SNMP_VERSION_1;
/* set the SNMPv1 community name used for authentication */
session.community = "public"; //change
session.community_len = strlen(session.community);
/*
* Open the session
*/
SOCK_STARTUP;
ss = snmp_open(&session); /* establish the session */
if (!ss) {
snmp_sess_perror("ack", &session);
SOCK_CLEANUP;
exit(1);
}
/*
* Create the PDU for the data for our request.
* 1) We're going to GET the system.sysDescr.0 node.
*/
pdu = snmp_pdu_create(SNMP_MSG_GET);
anOID_len = MAX_OID_LEN;
if (!snmp_parse_oid(".1.3.6.1.2.1.1.1.0", anOID, &anOID_len)) {
snmp_perror(".1.3.6.1.2.1.1.1.0");
SOCK_CLEANUP;
exit(1);
}
snmp_add_null_var(pdu, anOID, anOID_len);
/*
* Send the Request out.
*/
status = snmp_synch_response(ss, pdu, &response);
/*
* Process the response.
*/
if (status == STAT_SUCCESS && response->errstat == SNMP_ERR_NOERROR) {
/*
* SUCCESS: Print the result variables
*/
for(vars = response->variables; vars; vars = vars->next_variable)
print_variable(vars->name, vars->name_length, vars);
/* manipuate the information ourselves */
for(vars = response->variables; vars; vars = vars->next_variable) {
if (vars->type == ASN_OCTET_STR) {
char *sp = (char *)malloc(1 + vars->val_len);
memcpy(sp, vars->val.string, vars->val_len);
sp[vars->val_len] = '\0';
printf("value #%d is a string: %s\n", count++, sp);
free(sp);
}
else
printf("value #%d is NOT a string! Ack!\n", count++);
}
} else {
/*
* FAILURE: print what went wrong!
*/
if (status == STAT_SUCCESS)
fprintf(stderr, "Error in packet\nReason: %s\n",
snmp_errstring(response->errstat));
else if (status == STAT_TIMEOUT)
fprintf(stderr, "Timeout: No response from %s.\n",
session.peername);
else
snmp_sess_perror("snmpdemoapp", ss);
}
/*
* Clean up:
* 1) free the response.
* 2) close the session.
*/
if (response)
snmp_free_pdu(response);
snmp_close(ss);
usleep(1000); //new add
}
SOCK_CLEANUP;
return (0);
} /* main() */
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