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- package main
- import (
- "bufio"
- "fmt"
- "io"
- "net"
- "os"
- "strings"
- )
- func dns(domain string) {
- ns, err := net.LookupHost(domain)
- if err != nil {
- //fmt.Fprintf(os.Stderr, "Err: %s", err.Error())
- } else {
- fmt.Print(domain)
- }
- for _, n := range ns {
- fmt.Fprintf(os.Stdout, "--%s\n", n)
- }
- }
- func main() {
- f, err := os.Open("dns.txt")
- if err != nil {
- fmt.Print(err)
- }
- defer f.Close()
- buf := bufio.NewReader(f)
- for {
- line, err := buf.ReadString('\n')
- line = strings.TrimSpace(line)
- if err != nil {
- if err == io.EOF {
- break
- }
- fmt.Print(err)
- }
- domain := line + "lenovo.com.cn"
- go dns(domain)
- }
- }
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