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Update txeh.go #16

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Nov 16, 2022
Merged

Update txeh.go #16

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11 changes: 11 additions & 0 deletions txeh.go
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@ package txeh
import (
"fmt"
"io/ioutil"
"regexp"
"runtime"
"strings"
"sync"
Expand Down Expand Up @@ -211,6 +212,10 @@ func (h *Hosts) AddHost(addressRaw string, hostRaw string) {

// if the hostname is at a different address, go and remove it from the address
for hidx, hst := range h.hostFileLines[hflIdx].Hostnames {
//for localhost we can match more than one host
if isLocalhost(address) {
break
}
if hst == host {
h.Lock()
h.hostFileLines[hflIdx].Hostnames = removeStringElement(h.hostFileLines[hflIdx].Hostnames, hidx)
Expand Down Expand Up @@ -372,3 +377,9 @@ func lineFormatter(hfl HostFileLine) string {
}
return fmt.Sprintf("%-16s %s", hfl.Address, strings.Join(hfl.Hostnames, " "))
}
// IPLocalhost is a regex pattern for IPv4 or IPv6 loopback range.
const ipLocalhost = `((127\.([0-9]{1,3}\.){2}[0-9]{1,3})|(::1)$)`
var localhostIPRegexp = regexp.MustCompile(ipLocalhost)
func isLocalhost(address string) bool {
return localhostIPRegexp.MatchString(address)
}