1 files changed, 0 insertions, 193 deletions
diff --git a/middleware/hosts/hostsfile.go b/middleware/hosts/hostsfile.go
deleted file mode 100644
index a4f4a017d..000000000
--- a/middleware/hosts/hostsfile.go
+++ /dev/null
@@ -1,193 +0,0 @@
-// Copyright 2009 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// This file is a modified version of net/hosts.go from the golang repo
-
-package hosts
-
-import (
-	"bufio"
-	"bytes"
-	"io"
-	"net"
-	"os"
-	"strings"
-	"sync"
-	"time"
-
-	"github.com/coredns/coredns/middleware"
-)
-
-const cacheMaxAge = 5 * time.Second
-
-func parseLiteralIP(addr string) net.IP {
-	if i := strings.Index(addr, "%"); i >= 0 {
-		// discard ipv6 zone
-		addr = addr[0:i]
-	}
-
-	return net.ParseIP(addr)
-}
-
-func absDomainName(b string) string {
-	return middleware.Name(b).Normalize()
-}
-
-// Hostsfile contains known host entries.
-type Hostsfile struct {
-	sync.Mutex
-
-	// list of zones we are authoritive for
-	Origins []string
-
-	// Key for the list of literal IP addresses must be a host
-	// name. It would be part of DNS labels, a FQDN or an absolute
-	// FQDN.
-	// For now the key is converted to lower case for convenience.
-	byNameV4 map[string][]net.IP
-	byNameV6 map[string][]net.IP
-
-	// Key for the list of host names must be a literal IP address
-	// including IPv6 address with zone identifier.
-	// We don't support old-classful IP address notation.
-	byAddr map[string][]string
-
-	expire time.Time
-	path   string
-	mtime  time.Time
-	size   int64
-}
-
-// ReadHosts determines if the cached data needs to be updated based on the size and modification time of the hostsfile.
-func (h *Hostsfile) ReadHosts() {
-	now := time.Now()
-
-	if now.Before(h.expire) && len(h.byAddr) > 0 {
-		return
-	}
-	stat, err := os.Stat(h.path)
-	if err == nil && h.mtime.Equal(stat.ModTime()) && h.size == stat.Size() {
-		h.expire = now.Add(cacheMaxAge)
-		return
-	}
-
-	var file *os.File
-	if file, _ = os.Open(h.path); file == nil {
-		return
-	}
-	defer file.Close()
-
-	h.Parse(file)
-
-	// Update the data cache.
-	h.expire = now.Add(cacheMaxAge)
-	h.mtime = stat.ModTime()
-	h.size = stat.Size()
-}
-
-// Parse reads the hostsfile and populates the byName and byAddr maps.
-func (h *Hostsfile) Parse(file io.Reader) {
-	hsv4 := make(map[string][]net.IP)
-	hsv6 := make(map[string][]net.IP)
-	is := make(map[string][]string)
-
-	scanner := bufio.NewScanner(file)
-	for scanner.Scan() {
-		line := scanner.Bytes()
-		if i := bytes.Index(line, []byte{'#'}); i >= 0 {
-			// Discard comments.
-			line = line[0:i]
-		}
-		f := bytes.Fields(line)
-		if len(f) < 2 {
-			continue
-		}
-		addr := parseLiteralIP(string(f[0]))
-		if addr == nil {
-			continue
-		}
-		ver := ipVersion(string(f[0]))
-		for i := 1; i < len(f); i++ {
-			name := absDomainName(string(f[i]))
-			if middleware.Zones(h.Origins).Matches(name) == "" {
-				// name is not in Origins
-				continue
-			}
-			switch ver {
-			case 4:
-				hsv4[name] = append(hsv4[name], addr)
-			case 6:
-				hsv6[name] = append(hsv6[name], addr)
-			default:
-				continue
-			}
-			is[addr.String()] = append(is[addr.String()], name)
-		}
-	}
-	h.byNameV4 = hsv4
-	h.byNameV6 = hsv6
-	h.byAddr = is
-}
-
-// ipVersion returns what IP version was used textually
-func ipVersion(s string) int {
-	for i := 0; i < len(s); i++ {
-		switch s[i] {
-		case '.':
-			return 4
-		case ':':
-			return 6
-		}
-	}
-	return 0
-}
-
-// LookupStaticHostV4 looks up the IPv4 addresses for the given host from the hosts file.
-func (h *Hostsfile) LookupStaticHostV4(host string) []net.IP {
-	h.Lock()
-	defer h.Unlock()
-	h.ReadHosts()
-	if len(h.byNameV4) != 0 {
-		if ips, ok := h.byNameV4[absDomainName(host)]; ok {
-			ipsCp := make([]net.IP, len(ips))
-			copy(ipsCp, ips)
-			return ipsCp
-		}
-	}
-	return nil
-}
-
-// LookupStaticHostV6 looks up the IPv6 addresses for the given host from the hosts file.
-func (h *Hostsfile) LookupStaticHostV6(host string) []net.IP {
-	h.Lock()
-	defer h.Unlock()
-	h.ReadHosts()
-	if len(h.byNameV6) != 0 {
-		if ips, ok := h.byNameV6[absDomainName(host)]; ok {
-			ipsCp := make([]net.IP, len(ips))
-			copy(ipsCp, ips)
-			return ipsCp
-		}
-	}
-	return nil
-}
-
-// LookupStaticAddr looks up the hosts for the given address from the hosts file.
-func (h *Hostsfile) LookupStaticAddr(addr string) []string {
-	h.Lock()
-	defer h.Unlock()
-	h.ReadHosts()
-	addr = parseLiteralIP(addr).String()
-	if addr == "" {
-		return nil
-	}
-	if len(h.byAddr) != 0 {
-		if hosts, ok := h.byAddr[addr]; ok {
-			hostsCp := make([]string, len(hosts))
-			copy(hostsCp, hosts)
-			return hostsCp
-		}
-	}
-	return nil
-}