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package main
import (
"database/sql"
"errors"
"fmt"
_ "github.com/go-sql-driver/mysql"
"log"
"time"
)
const (
DATABASE_USER = "cleaner"
DATABASE_PASS = "nil"
DATABASE_CONNECTION = "" //e.g. "tcp(localhost:55555)
DATABASE_NAME = "netflow"
)
func cleanData(conf Config) (err error) {
db, err := sql.Open("mysql", DATABASE_USER+":"+DATABASE_PASS+"@/"+DATABASE_NAME)
if err != nil {
log.Println("Failed to connect to db")
return
}
defer db.Close()
//Remove the processed mark on entries older than 6 hours
err = reprocess(db, time.Now().Add(-6*time.Hour))
if err != nil {
return
}
var interval time.Duration
switch conf.Interval {
case "5min":
interval = time.Minute * 5
case "10min":
interval = time.Minute * 10
case "hour":
interval = time.Hour
case "day":
interval = time.Hour * 24
default:
err = errors.New(fmt.Sprintf("Invalid interval: %s", conf.Interval))
return
}
//Fetch data that should be cleaned
rDat, err := fetchRawData(db, time.Now().Add(-2*interval))
if err != nil {
log.Println("Faild to fetch raw data")
return
}
cDat, err := clean(rDat, conf)
if err != nil {
log.Println("Failed to clean data")
return
}
//Add noise for differential privacy
for i := range cDat {
cDat[i].occurances = diffpriv(cDat[i].occurances, 1, conf.Epsilon)
}
//Begin transaction
tx, err := db.Begin()
if err != nil {
log.Println("Failed to initialize transaction")
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()
log.Println("Failed to save cleaned data")
return
}
}
//remove old data
err = purgeRawData(tx, rDat)
if err != nil {
tx.Rollback()
log.Println("Failed to remove old data")
return
}
tx.Commit()
return
}
func getTimespan(t time.Time, conf Config) (span time.Time, err error) {
loc, err := time.LoadLocation(TIMEZONE)
if err != nil {
return
}
switch {
case conf.Interval == "5min": //Round the date into 5 minutes
y, m, d := t.Date()
h := t.Hour()
min := t.Minute()
min = (min / 5) * 5
span = time.Date(y, m, d, h, min, 0, 0, loc)
case conf.Interval == "10min": //Round the date into 10 minutes
y, m, d := t.Date()
h := t.Hour()
min := t.Minute()
min = (min / 10) * 10
span = time.Date(y, m, d, h, min, 0, 0, loc)
case conf.Interval == "hour": //Round the date into hour
y, m, d := t.Date()
h := t.Hour()
span = time.Date(y, m, d, h, 0, 0, 0, loc)
case conf.Interval == "day": //Round the date into day
y, m, d := t.Date()
span = time.Date(y, m, d, 0, 0, 0, 0, loc)
default:
err = errors.New(fmt.Sprintf("Bad interval in config %s", conf.Interval))
return
}
return
}
func clean(rDat []RawData, conf Config) (cDat []CleanData, err error) {
// collect all ips so we can query for their ip blocks
ips := make(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 ix, p := range pairs {
ips[p.ipAdr] = &pairs[ix]
}
var vol string
for _, rd := range rDat {
vol, err = rd.getVolSize(conf)
if err != nil {
return
}
var tim time.Time
tim, err = getTimespan(rd.time, conf)
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,
})
}
cDat = removeDups(cDat)
return
}
func removeDups(cDat []CleanData) []CleanData {
ret := make([]CleanData, 0)
var found bool
for ci := range cDat {
found = false
//Check if an equal struct already is appended
for ri := range ret {
if ret[ri].equals(&cDat[ci]) {
//If found, increase it occurances instead of
//appending a new struct
ret[ri].occurances += cDat[ci].occurances
found = true
break
}
}
if !found {
//if no equal struct is found
//append it
ret = append(ret, cDat[ci])
}
}
return ret
}
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