/
hosts.go
45 lines (41 loc) · 863 Bytes
/
hosts.go
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package hosts
import (
"bufio"
"net"
"net/http"
"strings"
"time"
)
func parseHosts(url string) (map[string]net.IP, error) {
client := http.Client{
Timeout: 5 * time.Second,
}
resp, err := client.Get(url)
if err != nil {
return nil, err
}
hosts := make(map[string]net.IP)
lines := bufio.NewReader(resp.Body)
for {
line, err := lines.ReadString('\n')
if err != nil {
break
}
if len(line) < 2 || line[0] == 35 || line[0] == 32 { // if first character is '#' or space
continue
}
if strings.ContainsAny(line, ":") { // ignore ipv6
continue
}
// split line
var pair []string
pair = strings.SplitN(line, "\t", 2)
if pair[0] == "" || pair[1] == "" {
continue
}
pair[1] = strings.TrimRight(pair[1], "\n")
pair[1] = strings.TrimSpace(pair[1])
hosts[pair[1]+"."] = net.ParseIP(pair[0])
}
return hosts, nil
}