int
handle_var_list(struct agent_snmp_session *asp)
{
struct variable_list *varbind_ptr;
u_char statType;
u_char *statP;
size_t statLen;
u_short acl;
WriteMethod *write_method;
AddVarMethod *add_method;
int noSuchObject = TRUE;
int count, view;
count = 0;
varbind_ptr = asp->start;
if ( !varbind_ptr ) {
return SNMP_ERR_NOERROR;
}
while (1) {
count++;
statp_loop:
statP = getStatPtr( varbind_ptr->name,
&varbind_ptr->name_length,
&statType, &statLen, &acl,
asp->exact, &write_method, asp->pdu, &noSuchObject);
if (statP == NULL && (asp->rw != WRITE || write_method == NULL)) {
/* Careful -- if the varbind was lengthy, it will have
allocated some memory. */
snmp_set_var_value(varbind_ptr, NULL, 0);
varbind_ptr->val.integer = NULL;
varbind_ptr->val_len = 0;
if ( asp->exact ) {
if ( noSuchObject == TRUE ){
statType = SNMP_NOSUCHOBJECT;
} else {
statType = SNMP_NOSUCHINSTANCE;
}
} else {
statType = SNMP_ENDOFMIBVIEW;
}
if (asp->pdu->version == SNMP_VERSION_1) {
asp->pdu->errstat = SNMP_ERR_NOSUCHNAME;
asp->pdu->errindex = count;
return SNMP_ERR_NOSUCHNAME;
}
else if (asp->rw == WRITE) {
asp->pdu->errstat =
( noSuchObject ? SNMP_ERR_NOTWRITABLE
: SNMP_ERR_NOCREATION );
asp->pdu->errindex = count;
return asp->pdu->errstat;
}
else
varbind_ptr->type = statType;
}
/* Delegated variables should be added to the
relevant outgoing request */
else if ( IS_DELEGATED(statType)) {
add_method = (AddVarMethod*)statP;
statType = (*add_method)( asp, varbind_ptr );
}
/* GETNEXT/GETBULK should just skip inaccessible entries */
else if ((view = in_a_view(varbind_ptr->name, &varbind_ptr->name_length,
asp->pdu, varbind_ptr->type))
&& !asp->exact) {
if (view != 5) send_easy_trap(SNMP_TRAP_AUTHFAIL, 0);
goto statp_loop;
}
/* Other access problems are permanent */
else if (( asp->rw == WRITE && !(acl & 2)) || view) {
if (asp->pdu->version == SNMP_VERSION_1 || asp->rw != WRITE) {
if (ds_get_boolean(DS_APPLICATION_ID, DS_AGENT_VERBOSE))
DEBUGMSGTL(("snmp_agent", " >> noSuchName (read-only)\n"));
ERROR_MSG("read-only");
statType = SNMP_ERR_NOSUCHNAME;
}
else {
if (ds_get_boolean(DS_APPLICATION_ID, DS_AGENT_VERBOSE))
DEBUGMSGTL(("snmp_agent", " >> notWritable\n"));
ERROR_MSG("Not Writable");
statType = SNMP_ERR_NOTWRITABLE;
}
asp->pdu->errstat = statType;
asp->pdu->errindex = count;
send_easy_trap(SNMP_TRAP_AUTHFAIL, 0);
return statType;
}
else {
/* dump verbose info */
if (ds_get_boolean(DS_APPLICATION_ID, DS_AGENT_VERBOSE) && statP)
dump_var(varbind_ptr->name, varbind_ptr->name_length,
statType, statP, statLen);
/* FINALLY we can act on SET requests ....*/
if ( asp->rw == WRITE ) {
if ( write_method != NULL ) {
statType = (*write_method)(asp->mode,
varbind_ptr->val.string,
varbind_ptr->type,
varbind_ptr->val_len, statP,
varbind_ptr->name,
varbind_ptr->name_length);
if (statType != SNMP_ERR_NOERROR) {
asp->pdu->errstat = statType;
asp->pdu->errindex = count;
return statType;
}
}
else {
if (!goodValue(varbind_ptr->type, varbind_ptr->val_len,
statType, statLen)){
if (asp->pdu->version == SNMP_VERSION_1)
statType = SNMP_ERR_BADVALUE;
else
statType = SNMP_ERR_WRONGTYPE; /* poor approximation */
asp->pdu->errstat = statType;
asp->pdu->errindex = count;
return statType;
}
/* actually do the set if necessary */
if (asp->mode == COMMIT)
setVariable(varbind_ptr->val.string, varbind_ptr->type,
varbind_ptr->val_len, statP, statLen);
}
}
/* ... or save the results from assorted GETs */
else {
snmp_set_var_value(varbind_ptr, statP, statLen);
varbind_ptr->type = statType;
}
}
if ( varbind_ptr == asp->end )
return SNMP_ERR_NOERROR;
varbind_ptr = varbind_ptr->next_variable;
if ( asp->mode == RESERVE1 )
snmp_vars_inc++;
}
}
//*
//* Parse_var_op_list goes through the list of variables and retrieves each one,
//* placing it's value in the output packet. In the case of a set request,
//* if action is RESERVE, the value is just checked for correct type and
//* value, and resources may need to be reserved. If the action is COMMIT,
//* the variable is set. If the action is FREE, an error was discovered
//* somewhere in the previous RESERVE pass, so any reserved resources
//* should be FREE'd.
//* If any error occurs, an error code is returned.
//*
int
parse_var_op_list(
snmp_session *session,
uint8 *data, //point to variable-binding of in-packet data
int length, //in packet data length
uint8 *out_data, //point to variable-binding of out-packet data
int out_length, //out packet buffer length
long *index, //error-index (output)
int msgtype, //message type
int action //???
)
{
uint8 type;
oid var_name[SNMP_MAX_NAME_LEN];
int var_name_len, var_val_len;
uint8 var_val_type, *var_val, statType;
uint8 *statP;
int statLen;
uint16 acl;
int (*write_method)();
uint8 *headerP, *var_list_start;
int dummyLen;
#ifdef WEBADMIN
int dummyLen1; // add -- By arius 5/17/2000
uint8 *newpacket_end; // add -- By arius 5/17/2000
#endif WEBADMIN
int noSuchObject;
int (*WriteMethod)(int,uint8 *,uint8,int,uint8 *,oid *,int);
int err, exact;
// if (msgtype== SET_REQ_MSG) rw = SNMP_WRITE;
// else rw = SNMP_READ;
if (msgtype == GETNEXT_REQ_MSG) exact = FALSE;
else exact = TRUE;
//Parse variable-binging header
data = asn_parse_header(data, &length, &type);
if (data == NULL){
ERROR("not enough space for varlist");
return PARSE_ERROR;
}
if (type != (uint8)(ASN_SEQUENCE | ASN_CONSTRUCTOR)){
ERROR("wrong type");
return PARSE_ERROR;
}
headerP = out_data;
//Set Resp variable-binging header
out_data = asn_build_sequence(out_data, &out_length,
(uint8)(ASN_SEQUENCE | ASN_CONSTRUCTOR), 0);
if (out_data == NULL){
ERROR("not enough space in output packet");
return BUILD_ERROR;
}
var_list_start = out_data;
*index = 1;
while((int)length > 0){
// parse the name, value pair
var_name_len = SNMP_MAX_NAME_LEN;
data = snmp_parse_var_op(data, var_name, &var_name_len, &var_val_type,
&var_val_len, &var_val, (int *)&length);
if (data == NULL) return PARSE_ERROR;
// now attempt to retrieve the variable on the local entity
statP = getStatPtr(var_name, &var_name_len, &statType,
&statLen, &acl, exact,
&write_method, SNMP_VERSION_1, &noSuchObject,
(msgtype==SET_REQ_MSG?
(session->access & SNMP_ACCESS_WRITE):
(session->access & SNMP_ACCESS_READ) )
);
if (/* session->version == SNMP_VERSION_1 &&*/
statP == NULL &&
(msgtype != SET_REQ_MSG || !write_method))
{
//** XXX: happens when running
// XXX: snmpwalk localhost public .1
// XXX: fix me some day.
//**
//** ERROR("warning: internal v1_error"); **
return SNMP_ERR_NOSUCHNAME;
}
// check if this variable is read-write (in the MIB sense).
if( msgtype == SET_REQ_MSG && acl != RWRITE )
return SNMP_ERR_READONLY;
// return session->version == SNMP_VERSION_1 ? SNMP_ERR_NOSUCHNAME : SNMP_ERR_NOTWRITABLE;
//* Its bogus to check here on getnexts - the whole packet shouldn't
// be dumped - this should should be the loop in getStatPtr
// luckily no objects are set unreadable. This can still be
// useful for sets to determine which are intrinsically writable
if (msgtype== SET_REQ_MSG){
if (write_method == NULL){
if (statP != NULL){
// see if the type and value is consistent with this entity's variable
if (!goodValue(var_val_type, var_val_len, statType,statLen))
{
// if (session->version != SNMP_VERSION_1)
// return SNMP_ERR_WRONGTYPE; // poor approximation
// else
{
snmp_inbadvalues++;
return SNMP_ERR_BADVALUE;
}
}
// actually do the set if necessary
if (action == COMMIT)
setVariable(var_val, var_val_type, var_val_len,statP, statLen);
} else {
// if (session->version != SNMP_VERSION_1)
// return SNMP_ERR_NOCREATION;
// else
return SNMP_ERR_NOSUCHNAME;
}
} else {
WriteMethod = (int (*)(int,uint8 *,uint8,int,uint8 *,oid *,int)) write_method;
err = (*WriteMethod)(action, var_val, var_val_type,
var_val_len, statP, var_name,
var_name_len);
//*
//* Map the SNMPv2 error codes to SNMPv1 error codes (RFC 2089).
//*
// if (session->version == SNMP_VERSION_1) {
switch (err) {
case SNMP_ERR_NOERROR:
// keep the no-error error:
break;
case SNMP_ERR_WRONGVALUE:
case SNMP_ERR_WRONGENCODING:
case SNMP_ERR_WRONGTYPE:
case SNMP_ERR_WRONGLENGTH:
case SNMP_ERR_INCONSISTENTVALUE:
err = SNMP_ERR_BADVALUE;
break;
case SNMP_ERR_NOACCESS:
case SNMP_ERR_NOTWRITABLE:
case SNMP_ERR_NOCREATION:
case SNMP_ERR_INCONSISTENTNAME:
case SNMP_ERR_AUTHORIZATIONERROR:
err = SNMP_ERR_NOSUCHNAME;
break;
default:
err = SNMP_ERR_GENERR;
break;
// }
}//if(session->version == SNMP_VERSION_1) ....
if (err != SNMP_ERR_NOERROR){
// if (session->version == SNMP_VERSION_1) {
snmp_inbadvalues++;
// }
return err;
}
}
} else {
//* retrieve the value of the variable and place it into the
//* outgoing packet
if (statP == NULL){
statLen = 0;
if (exact){
if (noSuchObject == TRUE){
statType = SNMP_NOSUCHOBJECT;
} else {
statType = SNMP_NOSUCHINSTANCE;
}
} else {
statType = SNMP_ENDOFMIBVIEW;
}
} //if (statP == NULL) ...
out_data = snmp_build_var_op(out_data, var_name, &var_name_len,
statType, statLen, statP,
&out_length);
if (out_data == NULL){
return SNMP_ERR_TOOBIG;
}
} //if (msgtype== SET_REQ_MSG) ...
(*index)++;
} //while((int)length > 0) ....
if(msgtype!= SET_REQ_MSG){
// save a pointer to the end of the packet
packet_end = out_data;
// Now rebuild header with the actual lengths
dummyLen = packet_end - var_list_start;
// modified by ---- Arius 5/17/2000
#ifdef WEBADMIN
dummyLen1 = packet_end - headerP;
newpacket_end = asn_build_sequence(headerP, &dummyLen1,
(uint8)(ASN_SEQUENCE | ASN_CONSTRUCTOR), dummyLen);
var_list_start -= (packet_end - newpacket_end);
out_length += (packet_end - newpacket_end);
// save new pointer to the end of the packet when the sapces will be adjust
packet_end = newpacket_end;
if (headerP == NULL)
#else
if (asn_build_sequence(headerP, &dummyLen,
(uint8)(ASN_SEQUENCE | ASN_CONSTRUCTOR),
dummyLen) == NULL)
#endif WEBADMIN
// end of here
{
return SNMP_ERR_TOOBIG; // bogus error ????
}
}
*index = 0;
return SNMP_ERR_NOERROR;
}
