79 lines
1.4 KiB
Go
79 lines
1.4 KiB
Go
package dnsfilter
|
|
|
|
import (
|
|
"fmt"
|
|
"os"
|
|
"path"
|
|
"runtime"
|
|
"strings"
|
|
"sync/atomic"
|
|
)
|
|
|
|
func isValidRule(rule string) bool {
|
|
if len(rule) < 4 {
|
|
return false
|
|
}
|
|
if rule[0] == '!' {
|
|
return false
|
|
}
|
|
if rule[0] == '#' {
|
|
return false
|
|
}
|
|
if strings.HasPrefix(rule, "[Adblock") {
|
|
return false
|
|
}
|
|
|
|
// Filter out all sorts of cosmetic rules:
|
|
// https://kb.adguard.com/en/general/how-to-create-your-own-ad-filters#cosmetic-rules
|
|
masks := []string{
|
|
"##",
|
|
"#@#",
|
|
"#?#",
|
|
"#@?#",
|
|
"#$#",
|
|
"#@$#",
|
|
"#?$#",
|
|
"#@?$#",
|
|
"$$",
|
|
"$@$",
|
|
"#%#",
|
|
"#@%#",
|
|
}
|
|
for _, mask := range masks {
|
|
if strings.Contains(rule, mask) {
|
|
return false
|
|
}
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
func updateMax(valuePtr *int64, maxPtr *int64) {
|
|
for {
|
|
current := atomic.LoadInt64(valuePtr)
|
|
max := atomic.LoadInt64(maxPtr)
|
|
if current <= max {
|
|
break
|
|
}
|
|
swapped := atomic.CompareAndSwapInt64(maxPtr, max, current)
|
|
if swapped {
|
|
break
|
|
}
|
|
// swapping failed because value has changed after reading, try again
|
|
}
|
|
}
|
|
|
|
func trace(format string, args ...interface{}) {
|
|
pc := make([]uintptr, 10) // at least 1 entry needed
|
|
runtime.Callers(2, pc)
|
|
f := runtime.FuncForPC(pc[0])
|
|
var buf strings.Builder
|
|
buf.WriteString(fmt.Sprintf("%s(): ", path.Base(f.Name())))
|
|
text := fmt.Sprintf(format, args...)
|
|
buf.WriteString(text)
|
|
if len(text) == 0 || text[len(text)-1] != '\n' {
|
|
buf.WriteRune('\n')
|
|
}
|
|
fmt.Fprint(os.Stderr, buf.String())
|
|
}
|