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443 lines
8.5 KiB
Go
443 lines
8.5 KiB
Go
package hosts
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import (
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"bufio"
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"fmt"
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"io"
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"net"
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"os"
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"runtime"
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"strings"
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"sync"
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)
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func SystemHostpath() string {
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if runtime.GOOS == "windows" {
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return `C:\Windows\System32\drivers\etc\hosts`
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}
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return `/etc/hosts`
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}
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type HostNode struct {
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uid uint64
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nextuid uint64
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lastuid uint64
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IP string
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Host []string
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Comment string
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Original string
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OnlyComment bool
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Valid bool
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}
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type Host struct {
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idx uint64
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hostPath string
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nextUid uint64
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lastUid uint64
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fulldata map[uint64]*HostNode
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hostData map[string][]*HostNode
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ipData map[string][]*HostNode
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sync.RWMutex
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}
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func NewHosts() *Host {
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return &Host{
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hostData: make(map[string][]*HostNode),
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ipData: make(map[string][]*HostNode),
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fulldata: make(map[uint64]*HostNode),
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}
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}
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func (h *Host) Parse(hostPath string) error {
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h.Lock()
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defer h.Unlock()
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h.hostPath = hostPath
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h.fulldata = make(map[uint64]*HostNode)
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h.hostData = make(map[string][]*HostNode)
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h.ipData = make(map[string][]*HostNode)
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return h.parse()
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}
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func (h *Host) parse() error {
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f, err := os.OpenFile(h.hostPath, os.O_RDONLY, 0666)
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if err != nil {
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return fmt.Errorf("open hosts file %s error: %s", h.hostPath, err)
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}
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defer f.Close()
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buf := bufio.NewReader(f)
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for {
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line, err := buf.ReadString('\n')
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if err == io.EOF {
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if h.idx-1 >= 0 {
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h.fulldata[h.idx].nextuid = 0
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h.lastUid = h.idx
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}
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break
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}
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if err != nil {
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return fmt.Errorf("read hosts file error: %s", err)
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}
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h.idx++
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line = strings.TrimSpace(line)
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data, _ := h.parseLine(line)
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data.uid = h.idx
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data.lastuid = h.idx - 1
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data.nextuid = h.idx + 1
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h.fulldata[data.uid] = &data
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if h.nextUid == 0 {
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h.nextUid = h.idx
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}
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if data.Valid {
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for _, v := range data.Host {
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h.hostData[v] = append(h.hostData[v], &data)
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}
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h.ipData[data.IP] = append(h.ipData[data.IP], &data)
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}
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}
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return nil
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}
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func (h *Host) parseLine(data string) (HostNode, error) {
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var res = HostNode{
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Original: data,
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}
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if len(data) == 0 {
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return res, fmt.Errorf("empty line")
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}
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if data[0] == '#' {
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res.Comment = data
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res.OnlyComment = true
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return res, nil
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}
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var dataArr []string
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cache := ""
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for k, v := range data {
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if v == '#' {
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if len(cache) > 0 {
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dataArr = append(dataArr, cache)
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cache = ""
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}
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dataArr = append(dataArr, data[k:])
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break
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}
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if v == ' ' || v == '\t' {
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if len(cache) > 0 {
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dataArr = append(dataArr, cache)
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cache = ""
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}
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continue
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}
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cache += string(v)
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}
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if len(cache) > 0 {
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dataArr = append(dataArr, cache)
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}
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if len(dataArr) < 2 {
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return res, fmt.Errorf("invalid line")
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}
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if strings.HasPrefix(dataArr[1], "#") {
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return res, fmt.Errorf("invalid line")
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}
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if net.ParseIP(dataArr[0]) == nil {
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return res, fmt.Errorf("invalid ip address")
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}
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for k, v := range dataArr {
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switch k {
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case 0:
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res.IP = v
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default:
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if strings.HasPrefix(v, "#") {
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res.Comment = v
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} else {
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res.Host = append(res.Host, v)
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}
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}
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}
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res.Valid = true
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return res, nil
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}
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func (h *Host) List() []*HostNode {
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h.RLock()
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defer h.RUnlock()
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var res []*HostNode
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nextUid := h.nextUid
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for {
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if nextUid == 0 {
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break
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}
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res = append(res, h.fulldata[nextUid])
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nextUid = h.fulldata[nextUid].nextuid
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}
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return res
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}
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func (h *Host) ListByHost(host string) []*HostNode {
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h.RLock()
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defer h.RUnlock()
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if h.hostData == nil {
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return nil
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}
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return h.hostData[host]
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}
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func (h *Host) ListIPsByHost(host string) []string {
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h.RLock()
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defer h.RUnlock()
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if h.hostData == nil {
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return nil
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}
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var res []string
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for _, v := range h.hostData[host] {
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res = append(res, v.IP)
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}
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return res
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}
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func (h *Host) ListFirstIPByHost(host string) string {
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h.RLock()
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defer h.RUnlock()
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if h.hostData == nil {
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return ""
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}
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for _, v := range h.hostData[host] {
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return v.IP
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}
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return ""
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}
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func (h *Host) ListByIP(ip string) []*HostNode {
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h.RLock()
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defer h.RUnlock()
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if h.ipData == nil {
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return nil
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}
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return h.ipData[ip]
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}
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func (h *Host) ListHostsByIP(ip string) []string {
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h.RLock()
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return h.listHostsByIP(ip)
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}
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func (h *Host) listHostsByIP(ip string) []string {
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if h.ipData == nil {
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return nil
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}
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var res []string
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for _, v := range h.ipData[ip] {
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res = append(res, v.Host...)
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}
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return res
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}
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func (h *Host) ListFirstHostByIP(ip string) string {
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h.RLock()
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defer h.RUnlock()
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if h.ipData == nil {
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return ""
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}
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for _, v := range h.ipData[ip] {
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if len(v.Host) > 0 {
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return v.Host[0]
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}
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}
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return ""
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}
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func (h *Host) AddHosts(ip string, hosts ...string) error {
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return h.addHosts("", ip, hosts...)
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}
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func (h *Host) AddHostsComment(comment string, ip string, hosts ...string) error {
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return h.addHosts(comment, ip, hosts...)
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}
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func (h *Host) RemoveIPHosts(ip string, hosts ...string) error {
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h.Lock()
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defer h.Unlock()
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if h.ipData == nil {
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return fmt.Errorf("hosts data not initialized")
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}
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ipInfo := h.ipData[ip]
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if len(ipInfo) == 0 {
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return nil
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}
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cntfor:
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for _, v := range ipInfo {
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for _, host := range hosts {
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if len(v.Host) == 1 && v.Host[0] == host {
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delete(h.ipData, ip)
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if v.lastuid != 0 {
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h.fulldata[v.lastuid].nextuid = v.nextuid
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} else {
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h.nextUid = v.nextuid
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}
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if v.nextuid != 0 {
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h.fulldata[v.nextuid].lastuid = v.lastuid
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} else {
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h.lastUid = v.lastuid
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}
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var newHostData []*HostNode
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for _, vv := range h.hostData[v.Host[0]] {
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if vv.uid != v.uid {
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newHostData = append(newHostData, vv)
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}
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}
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h.hostData[host] = newHostData
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delete(h.fulldata, v.uid)
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v = nil
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continue cntfor
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}
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if len(v.Host) > 1 {
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var newHosts []string
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for _, vv := range v.Host {
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if vv != host {
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newHosts = append(newHosts, vv)
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}
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}
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v.Host = newHosts
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var newHostData []*HostNode
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for _, vv := range h.hostData[host] {
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if vv.uid != v.uid {
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newHostData = append(newHostData, vv)
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}
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}
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h.hostData[host] = newHostData
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}
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}
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}
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return nil
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}
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func (h *Host) RemoveIPs(ips ...string) error {
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h.Lock()
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defer h.Unlock()
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if h.ipData == nil {
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return fmt.Errorf("hosts data not initialized")
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}
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for _, ip := range ips {
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ipInfo := h.ipData[ip]
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if len(ipInfo) == 0 {
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continue
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}
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for _, v := range ipInfo {
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delete(h.ipData, ip)
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delete(h.fulldata, v.uid)
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if v.lastuid != 0 {
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h.fulldata[v.lastuid].nextuid = v.nextuid
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} else {
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h.nextUid = v.nextuid
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}
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if v.nextuid != 0 {
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h.fulldata[v.nextuid].lastuid = v.lastuid
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} else {
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h.lastUid = v.lastuid
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}
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for _, host := range v.Host {
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var newHostData []*HostNode
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for _, vv := range h.hostData[host] {
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if vv.uid != v.uid {
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newHostData = append(newHostData, vv)
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}
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}
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h.hostData[host] = newHostData
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}
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}
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}
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return nil
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}
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func (h *Host) RemoveHosts(hosts ...string) error {
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h.Lock()
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defer h.Unlock()
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if h.hostData == nil {
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return fmt.Errorf("hosts data not initialized")
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}
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for _, host := range hosts {
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hostInfo := h.hostData[host]
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if len(hostInfo) == 0 {
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continue
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}
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delete(h.hostData, host)
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for _, v := range hostInfo {
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var newHosts []string
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for _, vv := range v.Host {
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if vv != host {
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newHosts = append(newHosts, vv)
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}
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}
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v.Host = newHosts
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if len(v.Host) == 0 {
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delete(h.ipData, v.IP)
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if v.lastuid != 0 {
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h.fulldata[v.lastuid].nextuid = v.nextuid
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} else {
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h.nextUid = v.nextuid
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}
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if v.nextuid != 0 {
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h.fulldata[v.nextuid].lastuid = v.lastuid
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} else {
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h.lastUid = v.lastuid
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}
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delete(h.fulldata, v.uid)
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}
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}
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}
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return nil
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}
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func (h *Host) SetIPHosts(ip string, hosts ...string) error {
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err := h.RemoveIPs(ip)
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if err != nil {
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return err
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}
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return h.AddHosts(ip, hosts...)
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}
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func (h *Host) addHosts(comment string, ip string, hosts ...string) error {
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h.Lock()
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defer h.Unlock()
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if h.hostData == nil {
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return fmt.Errorf("hosts data not initialized")
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}
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ipInfo := h.listHostsByIP(ip)
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var needAddHosts []string
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for _, v := range hosts {
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if !inArray(ipInfo, v) {
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needAddHosts = append(needAddHosts, v)
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}
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}
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if len(needAddHosts) == 0 {
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return nil
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}
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hostNode := HostNode{
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uid: h.idx + 1,
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nextuid: 0,
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lastuid: h.lastUid,
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IP: ip,
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Host: needAddHosts,
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Valid: true,
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Comment: comment,
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}
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h.idx++
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h.fulldata[h.lastUid].nextuid = h.idx
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h.lastUid = h.idx
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h.fulldata[h.idx] = &hostNode
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h.ipData[ip] = append(h.ipData[ip], &hostNode)
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for _, v := range needAddHosts {
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h.hostData[v] = append(h.hostData[v], &hostNode)
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}
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return nil
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}
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func inArray(arr []string, v string) bool {
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for _, vv := range arr {
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if v == vv {
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return true
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}
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}
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return false
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}
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