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package main
import (
"database/sql"
"errors"
_ "github.com/go-sql-driver/mysql"
"time"
)
const (
DATABASE_USER = "root"
DATABASE_PASS = "pass"
DATABASE_CONNECTION = "" //e.g. "tcp(localhost:55555)
DATABASE_NAME = "netflow"
MAXIMUM_ENTRIES = 10
TIMESPAN = "day"
)
type RawData struct {
ipSrc string
ipDst string
time time.Time
port int
packetSize int
}
type CleanData struct {
ipbSrc string
ipbDst string
time time.Time
port int
volume string
occurances int
}
func cleanData() (err error) {
db, err := sql.Open("mysql", DATABASE_USER+":"+DATABASE_PASS+"@/"+DATABASE_NAME)
if err != nil {
return
}
defer db.Close()
//Fetch data that should be cleaned
rDat, err := fetchRawData(db, MAXIMUM_ENTRIES)
if err != nil {
return
}
cDat, err := clean(rDat)
if err != nil {
return
}
//Begin transaction
tx, err := db.Begin()
if err != nil {
return
}
//save cleaned data
for _, cd := range cDat {
err = insertCleanData(tx, cd.ipbSrc, cd.ipbDst, cd.volume, cd.time, cd.port, cd.occurances)
if err != nil {
tx.Rollback()
return
}
}
//remove old data
err = purgeRawData(tx, rDat)
if err != nil {
tx.Rollback()
return
}
tx.Commit()
return
}
func getVolSize(s int) string {
return "medium"
}
func getTimespan(t time.Time) (span time.Time, err error) {
loc, err := time.LoadLocation("Local")
switch {
case TIMESPAN == "5min":
case TIMESPAN == "hour":
case TIMESPAN == "day":
y, m, d := t.Date()
if err != nil {
return
}
span = time.Date(y, m, d, 0, 0, 0, 0, loc)
default:
err = errors.New("Bad timespan")
return
}
return
}
func clean(rDat []RawData) (cDat []CleanData, err error) {
// collect all ips so we can query for their ip blocks
var ips map[string]*asnipPair
for _, rd := range rDat {
ips[rd.ipSrc] = nil
ips[rd.ipDst] = nil
}
var iplist []string
for ip := range ips {
iplist = append(iplist, ip)
}
pairs, err := findASAndIPBlock(iplist...)
if err != nil {
return
}
for _, p := range pairs {
ips[p.ipAdr] = &p
}
for _, rd := range rDat {
vol := getVolSize(rd.packetSize)
var tim time.Time
tim, err = getTimespan(rd.time)
if err != nil {
return
}
cDat = append(cDat,
CleanData{
ipbSrc: ips[rd.ipSrc].ipBlock,
ipbDst: ips[rd.ipDst].ipBlock,
time: tim,
port: rd.port,
volume: vol,
occurances: 1,
})
}
return
}
func fetchRawData(db *sql.DB, numRows int) (rDat []RawData, err error) {
prepStmt, err := db.Prepare("SELECT * FROM raw_data LIMIT ? ")
if err != nil {
return
}
rows, err := prepStmt.Query(numRows)
if err != nil {
return
}
for rows.Next() {
var r RawData
err = rows.Scan(&r.ipSrc, &r.ipDst, &r.time, &r.port, &r.packetSize)
if err != nil {
return
}
rDat = append(rDat, r)
}
return
}
func purgeRawData(tx *sql.Tx, rDat []RawData) (err error) {
prepStmt, err := tx.Prepare("DELETE FROM raw_data WHERE ip_src = ? AND ip_dst = ? AND time = ? AND port = ? AND packet_size = ?")
if err != nil {
return
}
for _, r := range rDat {
_, err = prepStmt.Exec(r.ipSrc, r.ipDst, r.time, r.port, r.packetSize)
if err != nil {
return
}
}
return
}
func insertCleanData(tx *sql.Tx, ipbSrc, ipbDst, volume string, time time.Time, port, occurences int) error {
prepStmt, err := tx.Prepare("INSERT INTO clean_data (ipb_src, ipb_dst, time, port, volume, occurenaces) VALUES ( ? , ? , ? , ? , ? , ? , ?) ON DUPLICATE KEY UPDATE occurences = occurences + ?")
if err != nil {
return err
}
_, err = prepStmt.Exec(ipbSrc, ipbDst, time, port, volume, occurences, occurences)
if err != nil {
return err
}
return nil
}
func insertASNIP(db *sql.DB, asn int, ipBlock string) error {
prepCheck, err := db.Prepare("SELECT asn FROM asnip WHERE ip_block = ?")
if err != nil {
return err
}
defer prepCheck.Close()
rows, err := prepCheck.Exec(ipBlock)
if err != nil {
return err
}
if rows != nil {
return nil
}
prepIns, err := db.Prepare("INSERT INTO asnip VALUES ( ? , ? )")
if err != nil {
return err
}
defer prepIns.Close()
_, err = prepIns.Exec(asn, ipBlock)
if err != nil {
return err
}
return nil
}
func removeASNIP(db *sql.DB, asn int, ipBlock string) error {
prepStmt, err := db.Prepare("DELETE FROM anip WHERE asn = ? AND ip_block = ?")
if err != nil {
return err
}
defer prepStmt.Close()
_, err = prepStmt.Exec(asn, ipBlock)
if err != nil {
return err
}
return nil
}
|
