Hi All,
I haven't had an answer so I don't know if the mail was received. Just in case below is what i wrote.
thanks Mauricio.
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Hi all,
I'm new to net snmp. i work with microsoft windows. I am trying to use the snmpdemoapp.c in the tutorial. but can't make it work. the snmpd.conf file is ok.
i am trying to use authentication and enryption using snmp v3. the user i created like this:
snmpusm -v 3 -u initial -n "" -l authPriv -a MD5 -A setup_passphrase -x DES -X setup_passphrase -l authPriv localhost create testusr initial User successfully created.
snmpusm -v 3 -u testusr -n "" -l authPriv -a MD5 -A setup_passphrase -x D ES -X setup_passphrase localhost passwd setup_passphrase testthispass SNMPv3 Key(s) successfully changed.
a snmpget works well:
snmpget -v 3 -u testusr -n "" -l authPriv -a MD5 -A testthispass -x DES -X testthispass localhost system.sysContact.0
but when i use the code below i get: Why it says it doesn't support encryption, if it works above? the agent was compiled with openssl
No log handling enabled - turning on stderr logging Encryption support not enabled. snmpget: USM encryption error
thanks, mauricio
i have done this:
#include <net-snmp/net-snmp-config.h> #include <net-snmp/net-snmp-includes.h> #include <string.h>
const char *pass="testthispass";
int main(int argc, char ** argv) { struct snmp_session session, *ss; struct snmp_pdu *pdu; struct snmp_pdu *response;
oid anOID[MAX_OID_LEN]; size_t anOID_len = MAX_OID_LEN;
struct variable_list *vars; int status; int count=1;
init_snmp("snmpapp");
snmp_sess_init( &session ); session.peername = strdup("127.0.0.1");
session.version=SNMP_VERSION_3;
session.securityName = strdup("testusr");
session.securityNameLen = strlen(session.securityName);
session.securityLevel = SNMP_SEC_LEVEL_AUTHPRIV;
session.securityAuthProto = usmHMACMD5AuthProtocol;
session.securityAuthProtoLen = sizeof(usmHMACMD5AuthProtocol)/sizeof(oid);
session.securityAuthKeyLen = USM_AUTH_KU_LEN;
session.securityPrivProto = usmDESPrivProtocol;
session.securityPrivProtoLen = USM_PRIV_PROTO_DES_LEN;
session.securityPrivKeyLen = USM_PRIV_KU_LEN;
if (generate_Ku(session.securityAuthProto, session.securityAuthProtoLen, (u_char *) pass, strlen(pass), session.securityAuthKey, &session.securityAuthKeyLen) != SNMPERR_SUCCESS) { snmp_perror(argv[0]); snmp_log(LOG_ERR, "Error generating Ku from authentication pass phrase. \n"); exit(1); }
if (generate_Ku(session.securityAuthProto, session.securityAuthProtoLen, (u_char *) pass, strlen(pass), session.securityPrivKey, &session.securityPrivKeyLen) != SNMPERR_SUCCESS) { snmp_perror(argv[0]); snmp_log(LOG_ERR, "Error generating Ku from authentication pass phrase. \n"); exit(1); }
SOCK_STARTUP; ss = snmp_open(&session);
if (!ss) { snmp_perror("ack"); snmp_log(LOG_ERR, "something horrible happened!!!\n"); exit(2); }
pdu = snmp_pdu_create(SNMP_MSG_GET); read_objid(".1.3.6.1.2.1.1.4.0", anOID, &anOID_len);
snmp_add_null_var(pdu, anOID, anOID_len);
status = snmp_synch_response(ss, pdu, &response);
if (status == STAT_SUCCESS && response->errstat == SNMP_ERR_NOERROR) {
for(vars = response->variables; vars; vars = vars->next_variable) print_variable(vars->name, vars->name_length, vars);
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
{
if (status == STAT_SUCCESS)
fprintf(stderr, "Error in packet\nReason: %s\n",snmp_errstring(response->errstat));
else
snmp_sess_perror("snmpget", ss);
}
if (response) snmp_free_pdu(response); snmp_close(ss);
SOCK_CLEANUP; return (0); }
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