/*
* If there was an error in the input pdu, creates a clone of the pdu
* that includes all the variables except the one marked by the errindex.
* The command is set to the input command and the reqid, errstat, and
* errindex are set to default values.
* If the error status didn't indicate an error, the error index didn't
* indicate a variable, the pdu wasn't a get response message, or there
* would be no remaining variables, this function will return 0.
* If everything was successful, a pointer to the fixed cloned pdu will
* be returned.
*/
netsnmp_pdu *
snmp_fix_pdu(netsnmp_pdu *pdu, int command)
{
netsnmp_pdu *newpdu;
if ((pdu->command != SNMP_MSG_RESPONSE)
|| (pdu->errstat == SNMP_ERR_NOERROR)
|| (0 == pdu->variables)
|| (pdu->errindex <= 0)) {
return 0; /* pre-condition tests fail */
}
newpdu = _clone_pdu(pdu, 1); /* copies all except errored variable */
if (!newpdu)
return 0;
if (!newpdu->variables) {
snmp_free_pdu(newpdu);
return 0; /* no variables. "should not happen" */
}
newpdu->command = command;
newpdu->reqid = snmp_get_next_reqid();
newpdu->msgid = snmp_get_next_msgid();
newpdu->errstat = SNMP_DEFAULT_ERRSTAT;
newpdu->errindex = SNMP_DEFAULT_ERRINDEX;
return newpdu;
}
int main(void)
{
netsnmp_session session;
netsnmp_pdu *pdu;
netsnmp_variable_list *vars;
int status=45,ctr;
pdu = (netsnmp_pdu *) calloc(1, sizeof(netsnmp_pdu));
if (pdu)
{
pdu->version = SNMP_VERSION_1;
pdu->command = SNMP_MSG_RESPONSE;
pdu->errstat = SNMP_DEFAULT_ERRSTAT;
pdu->errindex = SNMP_DEFAULT_ERRINDEX;
pdu->securityModel = SNMP_DEFAULT_SECMODEL;
pdu->transport_data = NULL;
pdu->transport_data_length = 0;
pdu->securityNameLen = 0;
pdu->contextNameLen = 0;
pdu->time = 0;
pdu->reqid = snmp_get_next_reqid();
pdu->msgid = snmp_get_next_msgid();
}
printf("Message before parsing");
for(ctr=0;ctr<pktlen;ctr++)
printf("%x",pkt[ctr]);
printf("\n\n");
status=snmp_parse(&session,pdu,pkt,pktlen);
printf("Status %d",status);
for(vars = pdu->variables; vars; vars = vars->next_variable)
{
print_variable(vars->name, vars->name_length, vars);
printf("printing..");
}
return (0);
}
netsnmp_pdu *
snmp_pdu_create(int command)
{
netsnmp_pdu *pdu;
pdu = (netsnmp_pdu *) calloc(1, sizeof(netsnmp_pdu));
if (pdu) {
pdu->version = SNMP_DEFAULT_VERSION;
pdu->command = command;
pdu->errstat = SNMP_DEFAULT_ERRSTAT;
pdu->errindex = SNMP_DEFAULT_ERRINDEX;
pdu->securityModel = SNMP_DEFAULT_SECMODEL;
pdu->transport_data = NULL;
pdu->transport_data_length = 0;
pdu->securityNameLen = 0;
pdu->contextNameLen = 0;
pdu->time = 0;
pdu->reqid = snmp_get_next_reqid();
pdu->msgid = snmp_get_next_msgid();
}
return pdu;
}
int main(void)
{
netsnmp_session session;
netsnmp_pdu *pdu;
netsnmp_variable_list *vars;
int status=45,ctr,i;
pdu = (netsnmp_pdu *) calloc(1, sizeof(netsnmp_pdu));
if (pdu)
{
//pdu->version = SNMP_VERSION_1;
//pdu->command = SNMP_MSG_RESPONSE;
//pdu->errstat = SNMP_DEFAULT_ERRSTAT;
//pdu->errindex = SNMP_DEFAULT_ERRINDEX;
pdu->securityModel = SNMP_DEFAULT_SECMODEL;
pdu->transport_data = NULL;
pdu->transport_data_length = 0;
pdu->securityNameLen = 0;
pdu->contextNameLen = 0;
pdu->time = 0;
pdu->reqid = snmp_get_next_reqid();
pdu->msgid = snmp_get_next_msgid();
}
printf("Message before parsing\n");
for(ctr=0;ctr<pktlen;ctr++)
printf("%x",pkt[ctr]);
printf("\n\n");
status=snmp_parse(&session,pdu,pkt,pktlen);
printf("Status %d",status);
for(vars = pdu->variables; vars; vars = vars->next_variable)
{
print_variable(vars->name, vars->name_length, vars);
}
printf("pdu:\nversion:%ld\ncommand:%d\n",pdu->version,pdu->command);
printf("Decoding done. \n Now encoding...");
status=snmp_build(&newpkt,&newpktlen,&offset,&session,pdu);
printf("\nstatus = %d\n",status);
printf("\nnewpktlen = %d\n",newpktlen);
printf("\noffset = %d\n",offset);
if(status==0 || status==-20)
{
//newpktlen=sizeof(newpkt);
//printf("seems successful\n Here's the new packet:\npktlen :%d\n",newpktlen);
printf("Packet dump : \n");
for(ctr=newpktlen-offset;ctr<newpktlen;ctr++)
{
printf("%X",newpkt[ctr]);
}
printf("\nPacket dump - END \n");
for(ctr=newpktlen-offset,i=0;i<pktlen && ctr<newpktlen;i++,ctr++)
{
if(newpkt[ctr]!=pkt[i])
{
printf("\nMISMATCH");
exit(1);
}
}
printf("\nMATCH!!!!\n Parse successful\n");
}
return (0);
}
