Internet protocol libraries and Application added

>> Internet \ FTPserver
>> Internet \ httpServer (web server)
>> Internet \ SNMP (SNMPv1 agent)
>> Application \ loopback (loopback test)

Internet/SNMP/snmp.h

@@ -0,0 +1,114 @@
+#ifndef _SNMP_H_
+#define _SNMP_H_
+
+// SNMP Debug Message (dump) Enable
+#define _SNMP_DEBUG_
+
+#define PORT_SNMP_AGENT				161
+#define PORT_SNMP_TRAP				162
+
+#define SNMP_V1						0
+
+#define MAX_OID						12
+#define MAX_STRING					64
+#define MAX_SNMPMSG_LEN				512
+#define MAX_TRAPMSG_LEN				512
+
+// SNMP Error code
+#define SNMP_SUCCESS				0
+#define OID_NOT_FOUND				-1
+#define TABLE_FULL					-2
+#define ILLEGAL_LENGTH				-3
+#define INVALID_ENTRY_ID			-4
+#define INVALID_DATA_TYPE			-5
+
+#define NO_SUCH_NAME				2
+#define BAD_VALUE					3
+
+// SNMPv1 Commands
+#define GET_REQUEST					0xa0
+#define GET_NEXT_REQUEST			0xa1
+#define GET_RESPONSE				0xa2
+#define SET_REQUEST					0xa3
+
+// Macros: SNMPv1 request validation checker
+#define VALID_REQUEST(x)			((x == GET_REQUEST) || (x == GET_NEXT_REQUEST) || (x == SET_REQUEST))
+
+// SNMPv1 Return Types
+#define SNMPDTYPE_INTEGER			0x02
+#define SNMPDTYPE_OCTET_STRING		0x04
+#define SNMPDTYPE_NULL_ITEM			0x05
+#define SNMPDTYPE_OBJ_ID			0x06
+#define SNMPDTYPE_SEQUENCE			0x30
+#define SNMPDTYPE_SEQUENCE_OF		SNMPDTYPE_SEQUENCE
+
+#define SNMPDTYPE_COUNTER			0x41
+#define SNMPDTYPE_GAUGE  			0x42
+#define SNMPDTYPE_TIME_TICKS		0x43
+#define SNMPDTYPE_OPAQUE			0x44
+
+// SNMP Trap: Standard Trap Types (Generic)
+#define SNMPTRAP_COLDSTART			0x00	// Generic trap-type 0: Cold Start
+#define SNMPTRAP_WARMSTART			0x01	// Generic trap-type 1: Warm Start
+#define SNMPTRAP_LINKDOWN			0x02	// Generic trap-type 2: Link Down
+#define SNMPTRAP_LINKUP				0x03	// Generic trap-type 3: Link Up
+#define SNMPTRAP_AUTHENTICATION		0x04	// Generic trap-type 4: Authentication Failure
+#define SNMPTRAP_EGPNEIGHBORLOSS	0x05	// Generic trap-type 5: EGP Neighbor Loss
+
+// Macros
+#define COPY_SEGMENT(x) \
+{ \
+	request_msg.index += seglen; \
+	memcpy(&response_msg.buffer[response_msg.index], &request_msg.buffer[x.start], seglen ); \
+	response_msg.index += seglen; \
+}
+
+#ifndef HTONL
+    #define HTONL(x)                    \
+        ((((x) >> 24) & 0x000000ff) |   \
+         (((x) >>  8) & 0x0000ff00) |   \
+         (((x) <<  8) & 0x00ff0000) |   \
+         (((x) << 24) & 0xff000000))
+#endif
+
+typedef struct {
+	uint8_t oidlen;
+	uint8_t oid[MAX_OID];
+	uint8_t dataType;
+	uint8_t dataLen;
+	union {
+		uint8_t octetstring[MAX_STRING];
+		uint32_t intval;
+	} u;
+	void (*getfunction)(void *, uint8_t *);
+	void (*setfunction)(int32_t);
+} dataEntryType;
+
+struct messageStruct {
+	uint8_t buffer[MAX_SNMPMSG_LEN];
+	int32_t len;
+	int32_t index;
+};
+
+typedef struct {
+	int32_t start;		/* Absolute Index of the TLV */
+	int32_t len;		/* The L value of the TLV */
+	int32_t vstart;		/* Absolute Index of this TLV's Value */
+	int32_t nstart;		/* Absolute Index of the next TLV */
+} tlvStructType;
+
+
+/********************************************************************************************/
+/* SNMP : Functions                                                                         */
+/********************************************************************************************/
+// SNMP Main functions
+void snmpd_init(uint8_t * managerIP, uint8_t * agentIP, uint8_t sn_agent, uint8_t sn_trap);
+int32_t snmpd_run(void);
+int32_t snmp_sendTrap(uint8_t * managerIP, uint8_t * agentIP, int8_t* community, dataEntryType enterprise_oid, uint32_t genericTrap, uint32_t specificTrap, uint32_t va_count, ...);
+
+// SNMP Time handler functions
+void SNMP_time_handler(void);
+uint32_t getSNMPTimeTick(void);
+void currentUptime(void *ptr, uint8_t *len);
+
+#endif