1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
package main
import (
"database/sql"
"errors"
"fmt"
_ "github.com/go-sql-driver/mysql"
"log"
"time"
)
func cleanData(conf Config, db_user, db_pass, db_conn, db_name string) (err error) {
db, err := sql.Open("mysql", db_user+":"+db_pass+"@"+db_conn+"/"+db_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), conf.Limit)
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].occurences = diffpriv(cDat[i].occurences, 1, conf.Epsilon)
}
//Begin transaction
tx, err := db.Begin()
if err != nil {
log.Println("Failed to initialize transaction")
return
}
//save cleaned data
for ix := range cDat {
err = insertCleanData(tx, &cDat[ix])
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]struct{})
for _, rd := range rDat {
ips[rd.ipSrc] = struct{}{}
ips[rd.ipDst] = 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, conf)
if err != nil {
return
}
cDat = append(cDat,
CleanData{
ipbSrc: pairs[rd.ipSrc],
ipbDst: pairs[rd.ipDst],
asSrc: rd.asSrc,
asDst: rd.asDst,
portSrc: rd.portSrc,
portDst: rd.portDst,
occurences: 1,
volume: rd.pktLenDist,
time: tim,
})
}
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 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
}
|
