137 lines
2.2 KiB
Go
137 lines
2.2 KiB
Go
package main
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import (
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"sync"
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"github.com/fsnotify/fsnotify"
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"strings"
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"golang.org/x/net/publicsuffix"
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"os"
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"bufio"
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"regexp"
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)
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type FileHosts struct {
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HostProvider
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file string
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hosts map[string]string
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mu sync.RWMutex
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}
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func NewFileProvider(file string) HostProvider {
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fp := &FileHosts{
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file: file,
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hosts: make(map[string]string),
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}
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watcher, err := fsnotify.NewWatcher()
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// Use fsnotify to notify us of host file changes
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if err == nil {
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watcher.Add(file)
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go func() {
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for {
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e := <- watcher.Events
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if e.Op == fsnotify.Write {
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fp.Refresh()
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}
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}
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}()
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}
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return fp
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}
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func (f *FileHosts) Get(domain string) ([]string, bool) {
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f.mu.RLock()
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defer f.mu.RUnlock()
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domain = strings.ToLower(domain)
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ip, ok := f.hosts[domain]
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if ok {
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return []string{ip}, true
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}
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sld, err := publicsuffix.EffectiveTLDPlusOne(domain)
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if err != nil {
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return nil, false
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}
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for host, ip := range f.hosts {
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if strings.HasPrefix(host, "*.") {
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old, err := publicsuffix.EffectiveTLDPlusOne(host)
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if err != nil {
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continue
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}
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if sld == old {
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return []string{ip}, true
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}
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}
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}
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return nil, false
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}
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var (
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hostRegexp = regexp.MustCompile("^(.*?)\\s+(.*)$")
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)
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func (f *FileHosts) Refresh() {
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buf, err := os.Open(f.file)
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if err != nil {
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logger.Warn("Update hosts records from file failed %s", err)
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return
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}
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defer buf.Close()
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f.mu.Lock()
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defer f.mu.Unlock()
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f.clear()
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scanner := bufio.NewScanner(buf)
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for scanner.Scan() {
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line := strings.TrimSpace(scanner.Text())
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if strings.HasPrefix(line, "#") || line == "" {
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continue
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}
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m := hostRegexp.FindStringSubmatch(line)
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if m == nil {
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continue
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}
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ip := m[1]
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if !isIP(ip) {
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continue
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}
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domains := strings.Split(m[2], " ")
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// Would have multiple columns of domain in line.
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// Such as "127.0.0.1 localhost localhost.domain" on linux.
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// The domains may not strict standard, like "local" so don't check with f.isDomain(domain).
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for _, domain := range domains {
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domain = strings.TrimSpace(domain)
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if domain == "" {
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continue
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}
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f.hosts[strings.ToLower(domain)] = ip
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}
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}
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logger.Debug("update hosts records from %s, total %d records.", f.file, len(f.hosts))
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}
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func (f *FileHosts) clear() {
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f.hosts = make(map[string]string)
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}
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