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Agentuino.h
634 lines (577 loc) · 19.7 KB
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Agentuino.h
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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.
@Edit: M. Pivovarsky <miroslav.pivovarsky@gmail.com>
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
*/
#ifndef Agentuino_h
#define Agentuino_h
#define SNMP_DEFAULT_PORT 161
#define SNMP_MIN_OID_LEN 2
#define SNMP_MAX_OID_LEN 64 // 128
#define SNMP_MAX_NAME_LEN 20
#define SNMP_MAX_VALUE_LEN 64 // 128 ??? should limit this
#define SNMP_MAX_PACKET_LEN SNMP_MAX_VALUE_LEN + SNMP_MAX_OID_LEN + 25 //???
#define SNMP_FREE(s) do { if (s) { free((void *)s); s=NULL; } } while(0)
//Frees a pointer only if it is !NULL and sets its value to NULL.
#define DEBUG
#include "Arduino.h"
#include "Udp.h"
#include "MIB.h"
#include "Variable.h"
extern "C" {
// callback function
typedef void (*onPduReceiveCallback)(void);
}
//typedef long long int64_t;
typedef unsigned long long uint64_t;
//typedef long int32_t;
//typedef unsigned long uint32_t;
//typedef unsigned char uint8_t;
//typedef short int16_t;
//typedef unsigned short uint16_t;
typedef union uint64_u {
uint64_t uint64;
byte data[8];
};
typedef union int32_u {
int32_t int32;
byte data[4];
};
typedef union uint32_u {
uint32_t uint32;
byte data[4];
};
typedef union int16_u {
int16_t int16;
byte data[2];
};
//typedef union uint16_u {
// uint16_t uint16;
// byte data[2];
//};
typedef enum ASN_BER_BASE_TYPES {
// ASN/BER base types
ASN_BER_BASE_UNIVERSAL = 0x0,
ASN_BER_BASE_APPLICATION = 0x40,
ASN_BER_BASE_CONTEXT = 0x80,
ASN_BER_BASE_PUBLIC = 0xC0,
ASN_BER_BASE_PRIMITIVE = 0x0,
ASN_BER_BASE_CONSTRUCTOR = 0x20
};
typedef enum SNMP_PDU_TYPES {
// PDU choices
SNMP_PDU_GET = ASN_BER_BASE_CONTEXT | ASN_BER_BASE_CONSTRUCTOR | 0,
SNMP_PDU_GET_NEXT = ASN_BER_BASE_CONTEXT | ASN_BER_BASE_CONSTRUCTOR | 1,
SNMP_PDU_RESPONSE = ASN_BER_BASE_CONTEXT | ASN_BER_BASE_CONSTRUCTOR | 2,
SNMP_PDU_SET = ASN_BER_BASE_CONTEXT | ASN_BER_BASE_CONSTRUCTOR | 3,
SNMP_PDU_TRAP = ASN_BER_BASE_CONTEXT | ASN_BER_BASE_CONSTRUCTOR | 4
};
typedef enum SNMP_TRAP_TYPES {
// Trap generic types:
SNMP_TRAP_COLD_START = 0,
SNMP_TRAP_WARM_START = 1,
SNMP_TRAP_LINK_DOWN = 2,
SNMP_TRAP_LINK_UP = 3,
SNMP_TRAP_AUTHENTICATION_FAIL = 4,
SNMP_TRAP_EGP_NEIGHBORLOSS = 5,
SNMP_TRAP_ENTERPRISE_SPECIFIC = 6
};
typedef enum SNMP_ERR_CODES {
SNMP_ERR_NO_ERROR = 0,
SNMP_ERR_TOO_BIG = 1,
SNMP_ERR_NO_SUCH_NAME = 2,
SNMP_ERR_BAD_VALUE = 3,
SNMP_ERR_READ_ONLY = 4,
SNMP_ERR_GEN_ERROR = 5,
SNMP_ERR_NO_ACCESS = 6,
SNMP_ERR_WRONG_TYPE = 7,
SNMP_ERR_WRONG_LENGTH = 8,
SNMP_ERR_WRONG_ENCODING = 9,
SNMP_ERR_WRONG_VALUE = 10,
SNMP_ERR_NO_CREATION = 11,
SNMP_ERR_INCONSISTANT_VALUE = 12,
SNMP_ERR_RESOURCE_UNAVAILABLE = 13,
SNMP_ERR_COMMIT_FAILED = 14,
SNMP_ERR_UNDO_FAILED = 15,
SNMP_ERR_AUTHORIZATION_ERROR = 16,
SNMP_ERR_NOT_WRITABLE = 17,
SNMP_ERR_INCONSISTEN_NAME = 18
};
typedef enum SNMP_API_STAT_CODES {
SNMP_API_STAT_SUCCESS = 0,
SNMP_API_STAT_MALLOC_ERR = 1,
SNMP_API_STAT_NAME_TOO_BIG = 2,
SNMP_API_STAT_OID_TOO_BIG = 3,
SNMP_API_STAT_VALUE_TOO_BIG = 4,
SNMP_API_STAT_PACKET_INVALID = 5,
SNMP_API_STAT_PACKET_TOO_BIG = 6,
SNMP_API_STAT_NO_SUCH_NAME = 7,
};
//
// http://oreilly.com/catalog/esnmp/chapter/ch02.html Table 2-1: SMIv1 Datatypes
typedef enum SNMP_SYNTAXES {
// SNMP ObjectSyntax values
SNMP_SYNTAX_SEQUENCE = ASN_BER_BASE_UNIVERSAL | ASN_BER_BASE_CONSTRUCTOR | 0x10,
// These values are used in the "syntax" member of VALUEs
SNMP_SYNTAX_BOOL = ASN_BER_BASE_UNIVERSAL | ASN_BER_BASE_PRIMITIVE | 1,
SNMP_SYNTAX_INT = ASN_BER_BASE_UNIVERSAL | ASN_BER_BASE_PRIMITIVE | 2,
SNMP_SYNTAX_BITS = ASN_BER_BASE_UNIVERSAL | ASN_BER_BASE_PRIMITIVE | 3,
SNMP_SYNTAX_OCTETS = ASN_BER_BASE_UNIVERSAL | ASN_BER_BASE_PRIMITIVE | 4,
SNMP_SYNTAX_NULL = ASN_BER_BASE_UNIVERSAL | ASN_BER_BASE_PRIMITIVE | 5,
SNMP_SYNTAX_OID = ASN_BER_BASE_UNIVERSAL | ASN_BER_BASE_PRIMITIVE | 6,
SNMP_SYNTAX_INT32 = SNMP_SYNTAX_INT,
SNMP_SYNTAX_IP_ADDRESS = ASN_BER_BASE_APPLICATION | ASN_BER_BASE_PRIMITIVE | 0,
SNMP_SYNTAX_COUNTER = ASN_BER_BASE_APPLICATION | ASN_BER_BASE_PRIMITIVE | 1,
SNMP_SYNTAX_GAUGE = ASN_BER_BASE_APPLICATION | ASN_BER_BASE_PRIMITIVE | 2,
SNMP_SYNTAX_TIME_TICKS = ASN_BER_BASE_APPLICATION | ASN_BER_BASE_PRIMITIVE | 3,
SNMP_SYNTAX_OPAQUE = ASN_BER_BASE_APPLICATION | ASN_BER_BASE_PRIMITIVE | 4,
SNMP_SYNTAX_NSAPADDR = ASN_BER_BASE_APPLICATION | ASN_BER_BASE_PRIMITIVE | 5,
SNMP_SYNTAX_COUNTER64 = ASN_BER_BASE_APPLICATION | ASN_BER_BASE_PRIMITIVE | 6,
SNMP_SYNTAX_UINT32 = ASN_BER_BASE_APPLICATION | ASN_BER_BASE_PRIMITIVE | 7,
};
typedef struct SNMP_OID {
byte data[SNMP_MAX_OID_LEN]; // ushort array insted??
size_t size;
//
byte * fromString(const char *buffer, size_t &size_array) {
if (buffer[0] == '1' && buffer[1] == '.' && buffer[2] == '3' && buffer[3] == '.') {
memset(data, 0, SNMP_MAX_OID_LEN);
data[0] = 0x2B;
int fs_ilen = strlen(buffer);
int fs_ic = 0;
int fs_id = 1;
char fs_Csl[5];
memset(fs_Csl, 0, 5);
for (int fs_i = 4; fs_i < fs_ilen; fs_i++) {
if (buffer[fs_i] == '.') {
word fs_oidw = atol(fs_Csl);
if (fs_oidw < 128) {
data[fs_id] = fs_oidw;
} else if (fs_oidw < 16384) {
byte fs_loidb = lowByte(fs_oidw) & 127;
word fs_oidwtmp = fs_oidw << 1;
byte fs_hoidb = highByte(fs_oidwtmp) | 128;
data[fs_id] = fs_hoidb;
fs_id++;
data[fs_id] = fs_loidb;
} else {
byte fs_loidb = lowByte(fs_oidw) & 127;
word fs_oidwtmp = fs_oidw << 1;
byte fs_hoidb = highByte(fs_oidwtmp) | 128;
fs_oidwtmp = fs_oidw >> 14;
byte fs_hhoidb = (lowByte(fs_oidwtmp) & 3) | 128;
data[fs_id] = fs_hhoidb;
fs_id++;
data[fs_id] = fs_hoidb;
fs_id++;
data[fs_id] = fs_loidb;
}
memset(fs_Csl, 0, 5);
fs_ic = 0;
fs_id++;
} else {
fs_Csl[fs_ic] = buffer[fs_i];
fs_ic++;
}
}
word fs_oidw = atoi(fs_Csl);
if (fs_oidw < 128) {
data[fs_id] = fs_oidw;
} else if (fs_oidw < 16384) {
byte fs_loidb = lowByte(fs_oidw) & 127;
word fs_oidwtmp = fs_oidw << 1;
byte fs_hoidb = highByte(fs_oidwtmp) | 128;
data[fs_id] = fs_hoidb;
fs_id++;
data[fs_id] = fs_loidb;
} else {
byte fs_loidb = lowByte(fs_oidw) & 127;
word fs_oidwtmp = fs_oidw << 1;
byte fs_hoidb = highByte(fs_oidwtmp) | 128;
fs_oidwtmp = fs_oidw >> 14;
byte fs_hhoidb = (lowByte(fs_oidwtmp) & 3) | 128;
data[fs_id] = fs_hhoidb;
fs_id++;
data[fs_id] = fs_hoidb;
fs_id++;
data[fs_id] = fs_loidb;
}
fs_id++;
size = fs_id;
size_array = size;
return data;
}
}
//
void toString(char *buffer) {
buffer[0] = '1';
buffer[1] = '.';
buffer[2] = '3';
buffer[3] = '\0';
//
char buff[16];
byte hsize = size - 1;
byte hpos = 1;
uint16_t subid;
//
while (hsize > 0) {
subid = 0;
uint16_t b = 0;
do {
uint16_t next = data[hpos++];
b = next & 0xFF;
subid = (subid << 7) + (b & ~0x80);
hsize--;
} while ((hsize > 0) && ((b & 0x80) != 0));
utoa(subid, buff, 10);
strcat(buffer, ".");
strcat(buffer, buff);
}
};
};
// union for values?
//
typedef struct SNMP_VALUE {
byte data[SNMP_MAX_VALUE_LEN];
size_t size;
SNMP_SYNTAXES syntax;
//
byte i; // for encoding/decoding functions
//
// clear's buffer and sets size to 0
void clear(void) {
memset(data, 0, SNMP_MAX_VALUE_LEN);
size = 0;
}
//
//
// ASN.1 decoding functions
//
// decode's an octet string, object-identifier, opaque syntax to string
SNMP_ERR_CODES decode(char *value, size_t max_size) {
if (syntax == SNMP_SYNTAX_OCTETS || syntax == SNMP_SYNTAX_OID
|| syntax == SNMP_SYNTAX_OPAQUE) {
if (strlen(value) - 1 < max_size) {
if (syntax == SNMP_SYNTAX_OID) {
value[0] = '1';
value[1] = '.';
value[2] = '3';
value[3] = '\0';
//
char buff[16];
byte hsize = size - 1;
byte hpos = 1;
uint16_t subid;
//
while (hsize > 0) {
subid = 0;
uint16_t b = 0;
do {
uint16_t next = data[hpos++];
b = next & 0xFF;
subid = (subid << 7) + (b & ~0x80);
hsize--;
} while ((hsize > 0) && ((b & 0x80) != 0));
utoa(subid, buff, 10);
strcat(value, ".");
strcat(value, buff);
}
} else {
for (i = 0; i < size; i++) {
value[i] = (char) data[i];
}
value[size] = '\0';
}
return SNMP_ERR_NO_ERROR;
} else {
clear();
return SNMP_ERR_TOO_BIG;
}
} else {
clear();
return SNMP_ERR_WRONG_TYPE;
}
}
//
// decode's an int syntax to int16
SNMP_ERR_CODES decode(int16_t *value) {
if (syntax == SNMP_SYNTAX_INT) {
uint8_t *p = (uint8_t*) value, i;
memset(value, 0, sizeof (*value));
for (i = 0; i < size; i++) {
*p++ = data[size - 1 - i];
}
return SNMP_ERR_NO_ERROR;
} else {
clear();
return SNMP_ERR_WRONG_TYPE;
}
}
//
// decode's an int32 syntax to int32
SNMP_ERR_CODES decode(int32_t *value) {
if (syntax == SNMP_SYNTAX_INT32) {
uint8_t *p = (uint8_t*) value, i;
memset(value, 0, sizeof (*value));
for (i = 0; i < size; i++) {
*p++ = data[size - 1 - i];
}
return SNMP_ERR_NO_ERROR;
} else {
clear();
return SNMP_ERR_WRONG_TYPE;
}
}
//
// decode's an uint32, counter, time-ticks, gauge syntax to uint32
SNMP_ERR_CODES decode(uint32_t *value) {
if (syntax == SNMP_SYNTAX_COUNTER || syntax == SNMP_SYNTAX_TIME_TICKS
|| syntax == SNMP_SYNTAX_GAUGE || syntax == SNMP_SYNTAX_UINT32) {
uint8_t *p = (uint8_t*) value, i;
memset(value, 0, sizeof (*value));
for (i = 0; i < size; i++) {
*p++ = data[size - 1 - i];
}
return SNMP_ERR_NO_ERROR;
} else {
clear();
return SNMP_ERR_WRONG_TYPE;
}
}
//
// decode's an ip-address, NSAP-address syntax to an ip-address byte array
SNMP_ERR_CODES decode(byte *value) {
memset(data, 0, SNMP_MAX_VALUE_LEN);
if (syntax == SNMP_SYNTAX_IP_ADDRESS || syntax == SNMP_SYNTAX_NSAPADDR) {
uint8_t *p = (uint8_t*) value, i;
memset(value, 0, 4);
for (i = 0; i < size; i++) {
*p++ = data[size - 4 - i];
}
return SNMP_ERR_NO_ERROR;
} else {
clear();
return SNMP_ERR_WRONG_TYPE;
}
}
//
// decode's a boolean syntax to boolean
SNMP_ERR_CODES decode(bool *value) {
if (syntax == SNMP_SYNTAX_BOOL) {
*value = (data[0] != 0);
return SNMP_ERR_NO_ERROR;
} else {
clear();
return SNMP_ERR_WRONG_TYPE;
}
}
//
//
// ASN.1 encoding functions
//
// encode's a octet string to a string, opaque syntax
// encode object-identifier here??
SNMP_ERR_CODES encode(SNMP_SYNTAXES syn, const char *value) {
memset(data, 0, SNMP_MAX_VALUE_LEN);
if (syn == SNMP_SYNTAX_OCTETS || syn == SNMP_SYNTAX_OPAQUE) {
if (strlen(value) - 1 < SNMP_MAX_VALUE_LEN) {
syntax = syn;
size = strlen(value);
for (i = 0; i < size; i++) {
data[i] = (byte) value[i];
}
return SNMP_ERR_NO_ERROR;
} else {
clear();
return SNMP_ERR_TOO_BIG;
}
} else {
clear();
return SNMP_ERR_WRONG_TYPE;
}
}
//
// encode's an int16 to int, opaque syntax
SNMP_ERR_CODES encode(SNMP_SYNTAXES syn, const int16_t value) {
memset(data, 0, SNMP_MAX_VALUE_LEN);
if (syn == SNMP_SYNTAX_INT || syn == SNMP_SYNTAX_OPAQUE) {
int16_u tmp;
size = 2;
syntax = syn;
tmp.int16 = value;
data[0] = tmp.data[1];
data[1] = tmp.data[0];
return SNMP_ERR_NO_ERROR;
} else {
clear();
return SNMP_ERR_WRONG_TYPE;
}
}
//
// encode's an int32 to int32, opaque syntax
SNMP_ERR_CODES encode(SNMP_SYNTAXES syn, const int32_t value) {
memset(data, 0, SNMP_MAX_VALUE_LEN);
if (syn == SNMP_SYNTAX_INT32 || syn == SNMP_SYNTAX_OPAQUE) {
int32_u tmp;
size = 4;
syntax = syn;
tmp.int32 = value;
data[0] = tmp.data[3];
data[1] = tmp.data[2];
data[2] = tmp.data[1];
data[3] = tmp.data[0];
return SNMP_ERR_NO_ERROR;
} else {
clear();
return SNMP_ERR_WRONG_TYPE;
}
}
//
// encode's an uint32 to uint32, counter, time-ticks, gauge, opaque syntax
SNMP_ERR_CODES encode(SNMP_SYNTAXES syn, const uint32_t value) {
memset(data, 0, SNMP_MAX_VALUE_LEN);
if (syn == SNMP_SYNTAX_COUNTER || syn == SNMP_SYNTAX_TIME_TICKS
|| syn == SNMP_SYNTAX_GAUGE || syn == SNMP_SYNTAX_UINT32
|| syn == SNMP_SYNTAX_OPAQUE) {
uint32_u tmp;
size = 4;
syntax = syn;
tmp.uint32 = value;
data[0] = tmp.data[3];
data[1] = tmp.data[2];
data[2] = tmp.data[1];
data[3] = tmp.data[0];
return SNMP_ERR_NO_ERROR;
} else {
clear();
return SNMP_ERR_WRONG_TYPE;
}
}
//
// encode's an ip-address byte array to ip-address, NSAP-address, opaque syntax
SNMP_ERR_CODES encode(SNMP_SYNTAXES syn, const byte *value) {
memset(data, 0, SNMP_MAX_VALUE_LEN);
if (syn == SNMP_SYNTAX_IP_ADDRESS || syn == SNMP_SYNTAX_NSAPADDR
|| syn == SNMP_SYNTAX_OPAQUE) {
if (sizeof (value) > 4) {
clear();
return SNMP_ERR_TOO_BIG;
} else {
size = 4;
syntax = syn;
data[0] = value[3];
data[1] = value[2];
data[2] = value[1];
data[3] = value[0];
return SNMP_ERR_NO_ERROR;
}
} else {
clear();
return SNMP_ERR_WRONG_TYPE;
}
}
//
// encode's a boolean to boolean, opaque syntax
SNMP_ERR_CODES encode(SNMP_SYNTAXES syn, const bool value) {
memset(data, 0, SNMP_MAX_VALUE_LEN);
if (syn == SNMP_SYNTAX_BOOL || syn == SNMP_SYNTAX_OPAQUE) {
size = 1;
syntax = syn;
data[0] = value ? 0xff : 0;
return SNMP_ERR_NO_ERROR;
} else {
clear();
return SNMP_ERR_WRONG_TYPE;
}
}
//
// encode's an uint64 to counter64, opaque syntax
SNMP_ERR_CODES encode(SNMP_SYNTAXES syn, const uint64_t value) {
memset(data, 0, SNMP_MAX_VALUE_LEN);
if (syn == SNMP_SYNTAX_COUNTER64 || syn == SNMP_SYNTAX_OPAQUE) {
uint64_u tmp;
size = 8;
syntax = syn;
tmp.uint64 = value;
data[0] = tmp.data[7];
data[1] = tmp.data[6];
data[2] = tmp.data[5];
data[3] = tmp.data[4];
data[4] = tmp.data[3];
data[5] = tmp.data[2];
data[6] = tmp.data[1];
data[7] = tmp.data[0];
return SNMP_ERR_NO_ERROR;
} else {
clear();
return SNMP_ERR_WRONG_TYPE;
}
}
//
// encode's a null to null, opaque syntax
SNMP_ERR_CODES encode(SNMP_SYNTAXES syn) {
clear();
if (syn == SNMP_SYNTAX_NULL || syn == SNMP_SYNTAX_OPAQUE) {
size = 0;
syntax = syn;
return SNMP_ERR_NO_ERROR;
} else {
return SNMP_ERR_WRONG_TYPE;
}
}
};
typedef struct SNMP_PDU {
SNMP_PDU_TYPES type;
int32_t version;
int32_t requestId;
SNMP_ERR_CODES error;
int32_t errorIndex;
SNMP_OID OID;
SNMP_VALUE VALUE;
};
class AgentuinoClass {
public:
// Agent functions
SNMP_API_STAT_CODES begin();
SNMP_API_STAT_CODES begin(char *getCommName, char *setCommName, uint16_t port);
void listen(void);
SNMP_API_STAT_CODES requestPdu(SNMP_PDU *pdu);
SNMP_API_STAT_CODES responsePdu(SNMP_PDU *pdu);
void onPduReceive(onPduReceiveCallback pduReceived);
void Trap(char Message[], byte RemIP[4], uint32_t Time,
char enterprise_oid[] = "1.3.6.1.4.1.36061.0", char oid_[] = "1.3.6.1.4.1.36061.3.1.1.1"); // This is the line you must add
void freePdu(SNMP_PDU *pdu);
// Helper functions
private:
byte _packet[SNMP_MAX_PACKET_LEN];
uint16_t _packetSize;
uint16_t _packetPos;
SNMP_PDU_TYPES _dstType;
uint8_t _dstIp[4];
uint16_t _dstPort;
char *_getCommName;
size_t _getSize;
char *_setCommName;
size_t _setSize;
onPduReceiveCallback _callback;
};
extern AgentuinoClass Agentuino;
// function for pduReceived() function
extern SNMP_API_STAT_CODES api_status;
extern SNMP_ERR_CODES status;
extern char oid[SNMP_MAX_OID_LEN];
extern uint32_t prevMillis;
void pduReceived(); // function the perform at SNMP Requirements
#endif