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Agentuino.cpp
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Agentuino.cpp
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/*
Agentuino.cpp - An Arduino library for a lightweight SNMP Agent.
Copyright (C) 2010 Eric C. Gionet <lavco_eg@hotmail.com>
All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
//
// sketch_aug23a
//
#include "Agentuino.h"
#include "EtherCard.h"
//EthernetUDP Udp;
SNMP_API_STAT_CODES AgentuinoClass::begin()
{
// set community names
_getCommName = "public";
_setCommName = "private";
// set community name set/get sizes
_setSize = strlen(_setCommName);
_getSize = strlen(_getCommName);
// init UDP socket
//Udp.begin(SNMP_DEFAULT_PORT);
//register udpSerialPrint() to port 1337
//ether.udpServerListenOnPort(&udpSerialPrint, SNMP_DEFAULT_PORT);
_srcPort = SNMP_DEFAULT_PORT;
return SNMP_API_STAT_SUCCESS;
}
SNMP_API_STAT_CODES AgentuinoClass::begin(char *getCommName, char *setCommName, uint16_t port)
{
// set community name set/get sizes
_setSize = strlen(setCommName);
_getSize = strlen(getCommName);
// validate get/set community name sizes
if ( _setSize > SNMP_MAX_NAME_LEN + 1 || _getSize > SNMP_MAX_NAME_LEN + 1 ) {
return SNMP_API_STAT_NAME_TOO_BIG;
}
// set community names
_getCommName = getCommName;
_setCommName = setCommName;
// validate session port number
if ( port == NULL || port == 0 ) port = SNMP_DEFAULT_PORT;
_srcPort = port;
// init UDP socket
//Udp.begin(port);
//register udpSerialPrint() to port 1337
//ether.udpServerListenOnPort(&udpSerialPrint, SNMP_DEFAULT_PORT);
return SNMP_API_STAT_SUCCESS;
}
void AgentuinoClass::listen(void)
{
// if bytes are available in receive buffer
// and pointer to a function (delegate function)
// isn't null, trigger the function
ether.packetLoop(ether.packetReceive());
//Udp.parsePacket();
if ( _packetAvailable && _callback != NULL ) (*_callback)();
}
void AgentuinoClass::parsePacket(uint16_t dest_port, uint8_t src_ip[IP_LEN], uint16_t src_port, const char *data, uint16_t len){
_packetAvailable = true;
memcpy(_dstIp, src_ip, 4);
_dstPort = src_port;
_srcPort = dest_port;
_packetSize = len;
// reset packet array
memset(_packet, 0, SNMP_MAX_PACKET_LEN);
// validate packet
if ( _packetSize != 0 && _packetSize > SNMP_MAX_PACKET_LEN ) {
_apiError = SNMP_API_STAT_PACKET_TOO_BIG;
return;
}
// get UDP packet
memcpy(_packet, data, _packetSize);
// packet check 1
if ( _packet[0] != 0x30 ) {
_apiError = SNMP_API_STAT_PACKET_INVALID;
return;
}
_apiError = SNMP_API_STAT_SUCCESS;
}
SNMP_API_STAT_CODES AgentuinoClass::requestPdu(SNMP_PDU *pdu)
{
char *community;
// sequence length
byte seqLen;
// version
byte verLen, verEnd;
// community string
byte comLen, comEnd;
// pdu
byte pduTyp, pduLen;
byte ridLen, ridEnd;
byte errLen, errEnd;
byte eriLen, eriEnd;
byte vblTyp, vblLen;
byte vbiTyp, vbiLen;
byte obiLen, obiEnd;
byte valTyp, valLen, valEnd;
byte i;
_packetAvailable = false;
if (_apiError != SNMP_API_STAT_SUCCESS) {
return _apiError;
}
// sequence length
seqLen = _packet[1];
// version
verLen = _packet[3];
verEnd = 3 + verLen;
// community string
comLen = _packet[verEnd + 2];
comEnd = verEnd + 2 + comLen;
// pdu
pduTyp = _packet[comEnd + 1];
pduLen = _packet[comEnd + 2];
ridLen = _packet[comEnd + 4];
ridEnd = comEnd + 4 + ridLen;
errLen = _packet[ridEnd + 2];
errEnd = ridEnd + 2 + errLen;
eriLen = _packet[errEnd + 2];
eriEnd = errEnd + 2 + eriLen;
vblTyp = _packet[eriEnd + 1];
vblLen = _packet[eriEnd + 2];
vbiTyp = _packet[eriEnd + 3];
vbiLen = _packet[eriEnd + 4];
obiLen = _packet[eriEnd + 6];
obiEnd = eriEnd + obiLen + 6;
valTyp = _packet[obiEnd + 1];
valLen = _packet[obiEnd + 2];
valEnd = obiEnd + 2 + valLen;
// extract version
pdu->version = 0;
for ( i = 0; i < verLen; i++ ) {
pdu->version = (pdu->version << 8) | _packet[5 + i];
}
// validate version
// pdu-type
pdu->type = (SNMP_PDU_TYPES)pduTyp;
_dstType = pdu->type;
// validate community size
if ( comLen > SNMP_MAX_NAME_LEN ) {
// set pdu error
pdu->error = SNMP_ERR_TOO_BIG;
return SNMP_API_STAT_NAME_TOO_BIG;
}
// validate community name
if ( pdu->type == SNMP_PDU_SET && comLen == _setSize ) {
for ( i = 0; i < _setSize; i++ ) {
if( _packet[verEnd + 3 + i] != (byte)_setCommName[i] ) {
// set pdu error
pdu->error = SNMP_ERR_NO_SUCH_NAME;
return SNMP_API_STAT_NO_SUCH_NAME;
}
}
} else if ( pdu->type == SNMP_PDU_GET && comLen == _getSize ) {
for ( i = 0; i < _getSize; i++ ) {
if( _packet[verEnd + 3 + i] != (byte)_getCommName[i] ) {
// set pdu error
pdu->error = SNMP_ERR_NO_SUCH_NAME;
return SNMP_API_STAT_NO_SUCH_NAME;
}
}
} else if ( pdu->type == SNMP_PDU_GET_NEXT && comLen == _getSize ) {
for ( i = 0; i < _getSize; i++ ) {
if( _packet[verEnd + 3 + i] != (byte)_getCommName[i] ) {
// set pdu error
pdu->error = SNMP_ERR_NO_SUCH_NAME;
return SNMP_API_STAT_NO_SUCH_NAME;
}
}
} else {
// set pdu error
pdu->error = SNMP_ERR_NO_SUCH_NAME;
return SNMP_API_STAT_NO_SUCH_NAME;
}
// extract reqiest-id 0x00 0x00 0x00 0x01 (4-byte int aka int32)
pdu->requestId = 0;
for ( i = 0; i < ridLen; i++ ) {
pdu->requestId = (pdu->requestId << 8) | _packet[comEnd + 5 + i];
}
// extract error
pdu->error = SNMP_ERR_NO_ERROR;
int32_t err = 0;
for ( i = 0; i < errLen; i++ ) {
err = (err << 8) | _packet[ridEnd + 3 + i];
}
pdu->error = (SNMP_ERR_CODES)err;
// extract error-index
pdu->errorIndex = 0;
for ( i = 0; i < eriLen; i++ ) {
pdu->errorIndex = (pdu->errorIndex << 8) | _packet[errEnd + 3 + i];
}
// validate object-identifier size
if ( obiLen > SNMP_MAX_OID_LEN ) {
// set pdu error
pdu->error = SNMP_ERR_TOO_BIG;
return SNMP_API_STAT_OID_TOO_BIG;
}
// extract and contruct object-identifier
memset(pdu->OID.data, 0, SNMP_MAX_OID_LEN);
pdu->OID.size = obiLen;
for ( i = 0; i < obiLen; i++ ) {
pdu->OID.data[i] = _packet[eriEnd + 7 + i];
}
// value-type
pdu->VALUE.syntax = (SNMP_SYNTAXES)valTyp;
// validate value size
if ( obiLen > SNMP_MAX_VALUE_LEN ) {
// set pdu error
pdu->error = SNMP_ERR_TOO_BIG;
return SNMP_API_STAT_VALUE_TOO_BIG;
}
// value-size
pdu->VALUE.size = valLen;
// extract value
memset(pdu->VALUE.data, 0, SNMP_MAX_VALUE_LEN);
for ( i = 0; i < valLen; i++ ) {
pdu->VALUE.data[i] = _packet[obiEnd + 3 + i];
}
return SNMP_API_STAT_SUCCESS;
}
SNMP_API_STAT_CODES AgentuinoClass::responsePdu(SNMP_PDU *pdu)
{
int32_u u;
ether.makeUdpReplyStart(_srcPort);
// Length of entire SNMP packet
_packetSize = 25 + sizeof(pdu->requestId) + sizeof(pdu->error) + sizeof(pdu->errorIndex) + pdu->OID.size + pdu->VALUE.size;
memset(_packet, 0, SNMP_MAX_PACKET_LEN);
if ( _dstType == SNMP_PDU_SET ) {
_packetSize += _setSize;
} else {
_packetSize += _getSize;
}
ether.makeUdpReplyData(SNMP_SYNTAX_SEQUENCE);
ether.makeUdpReplyData(_packetSize - 2);
// SNMP version
ether.makeUdpReplyData(SNMP_SYNTAX_INT);
ether.makeUdpReplyData(0x01);
ether.makeUdpReplyData(0x00);
// SNMP community string
ether.makeUdpReplyData(SNMP_SYNTAX_OCTETS);
if ( _dstType == SNMP_PDU_SET ) {
ether.makeUdpReplyData(_setSize);
ether.makeUdpReplyData(_setCommName, _setSize);
} else {
ether.makeUdpReplyData(_getSize);
ether.makeUdpReplyData(_getCommName, _getSize);
}
// SNMP PDU
ether.makeUdpReplyData(pdu->type);
ether.makeUdpReplyData(sizeof(pdu->requestId) + sizeof((int32_t)pdu->error) + sizeof(pdu->errorIndex) + pdu->OID.size + pdu->VALUE.size + 14);
// Request ID (size always 4 e.g. 4-byte int)
ether.makeUdpReplyData(SNMP_SYNTAX_INT);
ether.makeUdpReplyData(sizeof(pdu->requestId));
u.int32 = pdu->requestId;
ether.makeUdpReplyData(u.data[3]);
ether.makeUdpReplyData(u.data[2]);
ether.makeUdpReplyData(u.data[1]);
ether.makeUdpReplyData(u.data[0]);
// Error (size always 4 e.g. 4-byte int)
ether.makeUdpReplyData(SNMP_SYNTAX_INT);
ether.makeUdpReplyData(sizeof((int32_t)pdu->error));
u.int32 = pdu->error;
ether.makeUdpReplyData(u.data[3]);
ether.makeUdpReplyData(u.data[2]);
ether.makeUdpReplyData(u.data[1]);
ether.makeUdpReplyData(u.data[0]);
// Error Index (size always 4 e.g. 4-byte int)
ether.makeUdpReplyData(SNMP_SYNTAX_INT);
ether.makeUdpReplyData(sizeof(pdu->errorIndex));
u.int32 = pdu->errorIndex;
ether.makeUdpReplyData(u.data[3]);
ether.makeUdpReplyData(u.data[2]);
ether.makeUdpReplyData(u.data[1]);
ether.makeUdpReplyData(u.data[0]);
// Varbind List
ether.makeUdpReplyData(SNMP_SYNTAX_SEQUENCE);
ether.makeUdpReplyData(pdu->OID.size + pdu->VALUE.size + 6);
// Varbind
ether.makeUdpReplyData(SNMP_SYNTAX_SEQUENCE);
ether.makeUdpReplyData(pdu->OID.size + pdu->VALUE.size + 4);
// ObjectIdentifier
ether.makeUdpReplyData(SNMP_SYNTAX_OID);
ether.makeUdpReplyData(pdu->OID.size);
ether.makeUdpReplyData(pdu->OID.data, pdu->OID.size);
// Value
ether.makeUdpReplyData(pdu->VALUE.syntax);
ether.makeUdpReplyData(pdu->VALUE.size);
ether.makeUdpReplyData(pdu->VALUE.data, pdu->VALUE.size);
ether.makeUdpReplyFinish();
return SNMP_API_STAT_SUCCESS;
}
void AgentuinoClass::onPduReceive(onPduReceiveCallback pduReceived)
{
_callback = pduReceived;
}
void AgentuinoClass::freePdu(SNMP_PDU *pdu)
{
memset(pdu->OID.data, 0, SNMP_MAX_OID_LEN);
memset(pdu->VALUE.data, 0, SNMP_MAX_VALUE_LEN);
free((char *) pdu);
}
// Create one global object
AgentuinoClass Agentuino;