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package blocklist
import (
"bufio"
"os"
"strings"
)
type Blocklist struct {
domains map[string]struct{}
}
func Load(path string) (*Blocklist, error) {
bl := &Blocklist{domains: make(map[string]struct{})}
f, err := os.Open(path)
if err != nil {
if os.IsNotExist(err) {
return bl, nil
}
return nil, err
}
defer f.Close()
sc := bufio.NewScanner(f)
for sc.Scan() {
line := strings.TrimSpace(sc.Text())
if line == "" || line[0] == '#' {
continue
}
line = strings.ToLower(line)
line = strings.TrimSuffix(line, ".")
bl.domains[line] = struct{}{}
}
return bl, sc.Err()
}
func (bl *Blocklist) Blocked(qname string) bool {
qname = strings.ToLower(qname)
qname = strings.TrimSuffix(qname, ".")
if _, ok := bl.domains[qname]; ok {
return true
}
for i := 0; i < len(qname); i++ {
if qname[i] == '.' {
if _, ok := bl.domains[qname[i+1:]]; ok {
return true
}
}
}
return false
}
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