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package main
import (
"database/sql"
"errors"
"fmt"
_ "github.com/Go-SQL-Driver/MySQL"
"log"
"os"
"time"
)
var (
cllogger *log.Logger
)
func init() {
cllogger = log.New(os.Stdout, "[ Cleaner ]", log.LstdFlags)
}
func cleanFromDB(cfg *Config) (rowsLeft int, err error) {
if VERBOSE {
cllogger.Println("Starting to clean from db...")
}
db, err := sql.Open("mysql", cfg.DBUser+":"+cfg.DBPass+"@"+cfg.DBConn+"/"+cfg.DBName)
if err != nil {
cllogger.Println("Failed to connect to db")
return
}
defer db.Close()
//Remove the processed mark on entries older than 6 hours
err = reprocess(db, cfg, time.Now().Add(-1*time.Hour))
if err != nil {
return
}
interval, err := cfg.getInterval()
if err != nil {
return
}
cleanLimit := time.Now().Add(-2 * interval)
//Fetch data that should be cleaned
rDat, err := fetchRawData(db, cfg, cleanLimit)
if err != nil {
cllogger.Println("Faild to fetch raw data")
return
}
cDat, err := clean(rDat, cfg)
if err != nil {
cllogger.Println("Failed to clean data from db:", err)
return
}
//Begin transaction
tx, err := db.Begin()
if err != nil {
cllogger.Println("Failed to initialize transaction")
return
}
//save cleaned data
err = insertCleanData(tx, cfg, cDat)
if err != nil {
tx.Rollback()
cllogger.Println("Failed to save cleaned data")
return
}
//remove old data
err = purgeRawData(tx, cfg, rDat)
if err != nil {
tx.Rollback()
cllogger.Println("Failed to remove old data")
return
}
rowsLeft, err = availableRows(tx, cfg, cleanLimit)
if err != nil {
tx.Rollback()
cllogger.Println("Failed to fetch available rows")
return
}
tx.Commit()
if VERBOSE {
cllogger.Println("Finished cleaning from db!")
}
return
}
func cleanFromStdin(rDatChan <-chan []RawData, cfg *Config) error {
if VERBOSE {
cllogger.Println("Starting to clean from stdin...")
}
for rDat := range rDatChan {
cDat, err := clean(rDat, cfg)
if err != nil {
cllogger.Println("Failed to clean data from stdin:", err)
cllogger.Println("Skipping data:", cDat)
continue
}
err = insertCleanDataToDB(cfg, cDat)
if err != nil {
cllogger.Println("Failed to insert clean data from stdin:", err)
cllogger.Println("Skipping data:", cDat)
continue
}
}
if VERBOSE {
cllogger.Println("Finished cleaning from stdin!")
}
return nil
}
func getTimespan(t time.Time, cfg *Config) (span time.Time, err error) {
loc, err := time.LoadLocation(TIMEZONE)
if err != nil {
return
}
switch {
case cfg.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 cfg.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 cfg.Interval == "30min": //Round the date into 10 minutes
y, m, d := t.Date()
h := t.Hour()
min := t.Minute()
min = (min / 30) * 30
span = time.Date(y, m, d, h, min, 0, 0, loc)
case cfg.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 cfg.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", cfg.Interval))
return
}
return
}
func clean(rDat []RawData, cfg *Config) (cDat []cleanedData, err error) {
// collect all ips so we can query for their ip blocks
ips := make(map[string]struct{})
for _, rd := range rDat {
ips[rd.Ip_src] = struct{}{}
ips[rd.Ip_dst] = struct{}{}
}
var iplist []string
for ip := range ips {
iplist = append(iplist, ip)
}
pairs, err := findIPBlock(iplist...)
if err != nil {
return
}
for _, rd := range rDat {
var tim time.Time
tim, err = getTimespan(rd.time, cfg)
if err != nil {
return
}
cDat = append(cDat,
cleanedData{
ipbSrc: pairs[rd.Ip_src],
ipbDst: pairs[rd.Ip_dst],
asSrc: rd.As_src,
asDst: rd.As_dst,
portSrc: rd.Port_src,
portDst: rd.Port_dst,
occurences: rd.Packets,
volume: rd.Pkt_len_distrib,
time: tim,
})
}
cDat = removeDups(cDat)
return
}
func removeDups(cDat []cleanedData) []cleanedData {
ret := make([]cleanedData, 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 occurences instead of
//appending a new struct
ret[ri].occurences += cDat[ci].occurences
found = true
break
}
}
if !found {
//if no equal struct is found
//append it
ret = append(ret, cDat[ci])
}
}
return ret
}
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