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httpd.go
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httpd.go
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// SPDX-FileCopyrightText: 2020 M. Shulhan <[email protected]>
// SPDX-License-Identifier: GPL-3.0-or-later
package rescached
import (
"encoding/base64"
"encoding/json"
"fmt"
"log"
"net/http"
"path/filepath"
"regexp"
"strings"
"git.sr.ht/~shulhan/pakakeh.go/lib/dns"
libhttp "git.sr.ht/~shulhan/pakakeh.go/lib/http"
libnet "git.sr.ht/~shulhan/pakakeh.go/lib/net"
)
const (
defHTTPDRootDir = "_www"
paramNameDomain = "domain"
paramNameName = "name"
paramNameQuery = "query"
paramNameRecord = "record"
paramNameType = "type"
paramNameValue = "value"
httpAPIBlockd = `/api/block.d`
httpAPIBlockdDisable = `/api/block.d/disable`
httpAPIBlockdEnable = `/api/block.d/enable`
httpAPIBlockdFetch = `/api/block.d/fetch`
httpAPICaches = `/api/caches`
httpAPICachesSearch = `/api/caches/search`
httpAPIEnvironment = `/api/environment`
apiHostsd = "/api/hosts.d"
apiHostsdRR = "/api/hosts.d/rr"
apiZoned = "/api/zone.d"
apiZonedRR = "/api/zone.d/rr"
)
func (srv *Server) httpdInit() (err error) {
srv.httpd, err = libhttp.NewServer(srv.env.HttpdOptions)
if err != nil {
return fmt.Errorf("newHTTPServer: %w", err)
}
err = srv.httpdRegisterEndpoints()
if err != nil {
return fmt.Errorf("newHTTPServer: %w", err)
}
return nil
}
func (srv *Server) httpdRegisterEndpoints() (err error) {
// Register HTTP APIs to manage block.d.
err = srv.httpd.RegisterEndpoint(libhttp.Endpoint{
Method: libhttp.RequestMethodGet,
Path: httpAPIBlockd,
RequestType: libhttp.RequestTypeNone,
ResponseType: libhttp.ResponseTypeJSON,
Call: srv.httpAPIBlockdList,
})
if err != nil {
return err
}
err = srv.httpd.RegisterEndpoint(libhttp.Endpoint{
Method: libhttp.RequestMethodPut,
Path: httpAPIBlockd,
RequestType: libhttp.RequestTypeJSON,
ResponseType: libhttp.ResponseTypeJSON,
Call: srv.httpAPIBlockdUpdate,
})
if err != nil {
return err
}
err = srv.httpd.RegisterEndpoint(libhttp.Endpoint{
Method: libhttp.RequestMethodPost,
Path: httpAPIBlockdDisable,
RequestType: libhttp.RequestTypeForm,
ResponseType: libhttp.ResponseTypeJSON,
Call: srv.httpAPIBlockdDisable,
})
if err != nil {
return err
}
err = srv.httpd.RegisterEndpoint(libhttp.Endpoint{
Method: libhttp.RequestMethodPost,
Path: httpAPIBlockdEnable,
RequestType: libhttp.RequestTypeForm,
ResponseType: libhttp.ResponseTypeJSON,
Call: srv.httpAPIBlockdEnable,
})
if err != nil {
return err
}
err = srv.httpd.RegisterEndpoint(libhttp.Endpoint{
Method: libhttp.RequestMethodPost,
Path: httpAPIBlockdFetch,
RequestType: libhttp.RequestTypeForm,
ResponseType: libhttp.ResponseTypeJSON,
Call: srv.httpAPIBlockdFetch,
})
if err != nil {
return err
}
// Register HTTP APIs to manage caches.
err = srv.httpd.RegisterEndpoint(libhttp.Endpoint{
Method: libhttp.RequestMethodGet,
Path: httpAPICaches,
RequestType: libhttp.RequestTypeQuery,
ResponseType: libhttp.ResponseTypeJSON,
Call: srv.httpAPICaches,
})
if err != nil {
return err
}
err = srv.httpd.RegisterEndpoint(libhttp.Endpoint{
Method: libhttp.RequestMethodDelete,
Path: httpAPICaches,
RequestType: libhttp.RequestTypeQuery,
ResponseType: libhttp.ResponseTypeJSON,
Call: srv.httpAPICachesDelete,
})
if err != nil {
return err
}
err = srv.httpd.RegisterEndpoint(libhttp.Endpoint{
Method: libhttp.RequestMethodGet,
Path: httpAPICachesSearch,
RequestType: libhttp.RequestTypeQuery,
ResponseType: libhttp.ResponseTypeJSON,
Call: srv.httpAPICachesSearch,
})
if err != nil {
return err
}
// Register HTTP APIs to manage environment.
err = srv.httpd.RegisterEndpoint(libhttp.Endpoint{
Method: libhttp.RequestMethodGet,
Path: httpAPIEnvironment,
RequestType: libhttp.RequestTypeJSON,
ResponseType: libhttp.ResponseTypeJSON,
Call: srv.httpAPIEnvironmentGet,
})
if err != nil {
return err
}
err = srv.httpd.RegisterEndpoint(libhttp.Endpoint{
Method: libhttp.RequestMethodPost,
Path: httpAPIEnvironment,
RequestType: libhttp.RequestTypeJSON,
ResponseType: libhttp.ResponseTypeJSON,
Call: srv.httpAPIEnvironmentUpdate,
})
if err != nil {
return err
}
// Register HTTP APIs to manage hosts.d.
err = srv.httpd.RegisterEndpoint(libhttp.Endpoint{
Method: libhttp.RequestMethodPost,
Path: apiHostsd,
RequestType: libhttp.RequestTypeForm,
ResponseType: libhttp.ResponseTypeJSON,
Call: srv.apiHostsdCreate,
})
if err != nil {
return err
}
// Register API to delete hosts file.
err = srv.httpd.RegisterEndpoint(libhttp.Endpoint{
Method: libhttp.RequestMethodDelete,
Path: apiHostsd,
RequestType: libhttp.RequestTypeQuery,
ResponseType: libhttp.ResponseTypeJSON,
Call: srv.apiHostsdDelete,
})
if err != nil {
return err
}
// Register API to get content of hosts file.
err = srv.httpd.RegisterEndpoint(libhttp.Endpoint{
Method: libhttp.RequestMethodGet,
Path: apiHostsd,
RequestType: libhttp.RequestTypeQuery,
ResponseType: libhttp.ResponseTypeJSON,
Call: srv.apiHostsdGet,
})
if err != nil {
return err
}
// Register API to create one record in hosts file.
err = srv.httpd.RegisterEndpoint(libhttp.Endpoint{
Method: libhttp.RequestMethodPost,
Path: apiHostsdRR,
RequestType: libhttp.RequestTypeForm,
ResponseType: libhttp.ResponseTypeJSON,
Call: srv.apiHostsdRecordAdd,
})
if err != nil {
return err
}
// Register API to delete a record from hosts file.
err = srv.httpd.RegisterEndpoint(libhttp.Endpoint{
Method: libhttp.RequestMethodDelete,
Path: apiHostsdRR,
RequestType: libhttp.RequestTypeQuery,
ResponseType: libhttp.ResponseTypeJSON,
Call: srv.apiHostsdRecordDelete,
})
if err != nil {
return err
}
err = srv.httpd.RegisterEndpoint(libhttp.Endpoint{
Method: libhttp.RequestMethodGet,
Path: apiZoned,
RequestType: libhttp.RequestTypeNone,
ResponseType: libhttp.ResponseTypeJSON,
Call: srv.apiZoned,
})
if err != nil {
return err
}
err = srv.httpd.RegisterEndpoint(libhttp.Endpoint{
Method: libhttp.RequestMethodPost,
Path: apiZoned,
RequestType: libhttp.RequestTypeForm,
ResponseType: libhttp.ResponseTypeJSON,
Call: srv.apiZonedCreate,
})
if err != nil {
return err
}
err = srv.httpd.RegisterEndpoint(libhttp.Endpoint{
Method: libhttp.RequestMethodDelete,
Path: apiZoned,
RequestType: libhttp.RequestTypeNone,
ResponseType: libhttp.ResponseTypeJSON,
Call: srv.apiZonedDelete,
})
if err != nil {
return err
}
err = srv.httpd.RegisterEndpoint(libhttp.Endpoint{
Method: libhttp.RequestMethodGet,
Path: apiZonedRR,
RequestType: libhttp.RequestTypeQuery,
ResponseType: libhttp.ResponseTypeJSON,
Call: srv.apiZonedRR,
})
if err != nil {
return err
}
err = srv.httpd.RegisterEndpoint(libhttp.Endpoint{
Method: libhttp.RequestMethodPost,
Path: apiZonedRR,
RequestType: libhttp.RequestTypeJSON,
ResponseType: libhttp.ResponseTypeJSON,
Call: srv.apiZonedRRAdd,
})
if err != nil {
return err
}
err = srv.httpd.RegisterEndpoint(libhttp.Endpoint{
Method: libhttp.RequestMethodDelete,
Path: apiZonedRR,
RequestType: libhttp.RequestTypeForm,
ResponseType: libhttp.ResponseTypeJSON,
Call: srv.apiZonedRRDelete,
})
if err != nil {
return err
}
return nil
}
func (srv *Server) httpdRun() {
defer func() {
err := recover()
if err != nil {
log.Printf("httpServer: %s", err)
}
}()
log.Printf("=== rescached: httpd listening at %s", srv.env.WUIListen)
err := srv.httpd.Start()
if err != nil {
log.Printf("httpServer.run: %s", err)
}
}
// httpAPIBlockdList fetch the list of block.d files.
//
// # Request
//
// GET /api/block.d
//
// # Response
//
// On success it will return list of hosts in block.d,
//
// {
// "data": {
// "<name>": <Blockd>
// ...
// }
// }
func (srv *Server) httpAPIBlockdList(_ *libhttp.EndpointRequest) (resBody []byte, err error) {
var res = libhttp.EndpointResponse{}
res.Code = http.StatusOK
res.Data = srv.env.HostBlockd
resBody, err = json.Marshal(&res)
return resBody, err
}
// httpAPIBlockdDisable disable the hosts block.d.
//
// # Request
//
// POST /api/block.d/disable
// Content-Type: application/x-www-form-urlencoded
//
// name=<name>
//
// # Response
//
// On success, it will return the affected Blockd object.
//
// {
// "data": <Blockd>
// }
func (srv *Server) httpAPIBlockdDisable(epr *libhttp.EndpointRequest) (resBody []byte, err error) {
var (
res = libhttp.EndpointResponse{}
hb *Blockd
hbName string
)
hbName = strings.ToLower(epr.HTTPRequest.Form.Get(paramNameName))
hb = srv.env.HostBlockd[hbName]
if hb == nil {
res.Code = http.StatusBadRequest
res.Message = `hosts block.d name not found: ` + hbName
return nil, &res
}
if hb.IsEnabled {
err = hb.disable()
if err != nil {
res.Code = http.StatusInternalServerError
res.Message = err.Error()
return nil, &res
}
}
res.Code = http.StatusOK
res.Message = fmt.Sprintf("hosts block.d %s has succesfully disabled", hbName)
res.Data = hb
return json.Marshal(&res)
}
// httpAPIBlockdEnable enable the hosts block.d.
//
// # Request
//
// POST /api/block.d/enable
// Content-Type: application/x-www-form-urlencoded
//
// name=<name>
//
// # Response
//
// On success, it will return the affected Blockd object.
//
// {
// "data": <Blockd>
// }
func (srv *Server) httpAPIBlockdEnable(epr *libhttp.EndpointRequest) (resBody []byte, err error) {
var (
res = libhttp.EndpointResponse{}
hb *Blockd
hbName string
)
hbName = strings.ToLower(epr.HTTPRequest.Form.Get(paramNameName))
hb = srv.env.HostBlockd[hbName]
if hb == nil {
res.Code = http.StatusBadRequest
res.Message = `hosts block.d name not found: ` + hbName
return nil, &res
}
if !hb.IsEnabled {
err = hb.enable()
if err != nil {
res.Code = http.StatusInternalServerError
res.Message = err.Error()
return nil, &res
}
}
res.Code = http.StatusOK
res.Message = fmt.Sprintf("hosts block.d %s has succesfully enabled", hbName)
res.Data = hb
return json.Marshal(&res)
}
// httpAPIBlockdFetch fetch the latest hosts file from the block.d provider
// based on registered URL.
//
// # Request
//
// POST /api/block.d/update
// Content-Type: application/x-www-form-urlencoded
//
// Name=<block.d name>
//
// # Response
//
// On success, the hosts file will be updated and the server will be
// restarted.
func (srv *Server) httpAPIBlockdFetch(epr *libhttp.EndpointRequest) (resBody []byte, err error) {
var (
logp = `httpAPIBlockdFetch`
res = libhttp.EndpointResponse{}
hb *Blockd
hbName string
)
hbName = strings.ToLower(epr.HTTPRequest.Form.Get(paramNameName))
hb = srv.env.HostBlockd[hbName]
if hb == nil {
res.Code = http.StatusBadRequest
res.Message = fmt.Sprintf("%s: unknown hosts block.d name: %s", logp, hbName)
return nil, &res
}
err = hb.update()
if err != nil {
res.Code = http.StatusInternalServerError
res.Message = fmt.Sprintf("%s: %s", logp, err)
return nil, &res
}
srv.Stop()
err = srv.Start()
if err != nil {
res.Code = http.StatusInternalServerError
res.Message = err.Error()
return nil, &res
}
res.Code = http.StatusOK
res.Message = fmt.Sprintf("%s: block.d %s has succesfully updated", logp, hbName)
res.Data = hb
return json.Marshal(&res)
}
func (srv *Server) httpAPICaches(_ *libhttp.EndpointRequest) (resBody []byte, err error) {
var (
res = libhttp.EndpointResponse{}
answers = srv.dns.Caches.ExternalLRU()
)
res.Code = http.StatusOK
if len(answers) == 0 {
res.Data = make([]struct{}, 0, 1)
} else {
res.Data = answers
}
return json.Marshal(&res)
}
func (srv *Server) httpAPICachesSearch(epr *libhttp.EndpointRequest) (resBody []byte, err error) {
var (
res = libhttp.EndpointResponse{}
q = epr.HTTPRequest.Form.Get(paramNameQuery)
re *regexp.Regexp
listMsg []*dns.Message
)
if len(q) == 0 {
res.Code = http.StatusOK
res.Data = make([]struct{}, 0, 1)
return json.Marshal(&res)
}
re, err = regexp.Compile(q)
if err != nil {
res.Code = http.StatusInternalServerError
res.Message = err.Error()
return nil, &res
}
listMsg = srv.dns.Caches.ExternalSearch(re)
if listMsg == nil {
listMsg = make([]*dns.Message, 0)
}
res.Code = http.StatusOK
res.Data = listMsg
return json.Marshal(&res)
}
func (srv *Server) httpAPICachesDelete(epr *libhttp.EndpointRequest) (resBody []byte, err error) {
var (
res = libhttp.EndpointResponse{}
q = epr.HTTPRequest.Form.Get(paramNameName)
answers []*dns.Answer
)
if len(q) == 0 {
res.Code = http.StatusInternalServerError
res.Message = "empty query 'name' parameter"
return nil, &res
}
if q == "all" {
answers = srv.dns.Caches.ExternalClear()
} else {
answers = srv.dns.Caches.ExternalRemoveNames([]string{q})
}
res.Code = http.StatusOK
res.Data = answers
return json.Marshal(&res)
}
// httpAPIEnvironmentGet get the current Environment.
//
// # Request
//
// GET /api/environment
//
// # Response
//
// Content-Type: application/json
//
// {
// "data": <Environment>
// }
func (srv *Server) httpAPIEnvironmentGet(_ *libhttp.EndpointRequest) (resBody []byte, err error) {
var (
res = libhttp.EndpointResponse{}
)
res.Code = http.StatusOK
res.Data = srv.env
return json.Marshal(&res)
}
// httpAPIEnvironmentUpdate update the environment and restart the service.
//
// # Request
//
// Format,
//
// POST /api/environment
// Content-Type: application/json
//
// {
// <Environment>
// }
//
// # Response
//
// Content-Type: application/json
//
// {
// "data": <Environment>
// }
func (srv *Server) httpAPIEnvironmentUpdate(epr *libhttp.EndpointRequest) (resBody []byte, err error) {
var (
res = libhttp.EndpointResponse{}
newEnv = new(Environment)
)
err = json.Unmarshal(epr.RequestBody, newEnv)
if err != nil {
res.Code = http.StatusBadRequest
res.Message = err.Error()
return nil, &res
}
if len(newEnv.ServerOptions.NameServers) == 0 {
res.Code = http.StatusBadRequest
res.Message = "At least one parent name servers must be defined"
return nil, &res
}
srv.env.ServerOptions = newEnv.ServerOptions
if len(srv.env.ServerOptions.ListenAddress) == 0 {
srv.env.ServerOptions.ListenAddress = defListenAddress
}
srv.env.Debug = newEnv.Debug
err = srv.env.write(srv.env.fileConfig)
if err != nil {
res.Code = http.StatusInternalServerError
res.Message = err.Error()
return nil, &res
}
srv.Stop()
err = srv.Start()
if err != nil {
res.Code = http.StatusInternalServerError
res.Message = err.Error()
return nil, &res
}
res.Code = http.StatusOK
res.Message = "Restarting DNS server"
res.Data = srv.env
return json.Marshal(&res)
}
// httpAPIBlockdUpdate set the HostsBlock to be enabled or disabled.
//
// If its status changes to enabled, unhide the hosts block file, populate the
// hosts back to caches, and add it to list of hostBlockdFile.
//
// If its status changes to disabled, remove the hosts from caches, hide it,
// and remove it from list of hostBlockdFile.
//
// # Request
//
// Format,
//
// PUT /api/block.d
// Content-Type: application/json
//
// {
// "<Blockd name>": <Blockd>,
// ...
// }
//
// # Response
//
// On success, it will return the list of Blockd objects.
//
// {
// "data": {
// "<Blockd name>": <Blockd>,
// ...
// }
// }
func (srv *Server) httpAPIBlockdUpdate(epr *libhttp.EndpointRequest) (resBody []byte, err error) {
var (
logp = `httpAPIBlockdUpdate`
res = libhttp.EndpointResponse{}
hostBlockd = make(map[string]*Blockd, 0)
blockdReq *Blockd
blockdCur *Blockd
)
err = json.Unmarshal(epr.RequestBody, &hostBlockd)
if err != nil {
res.Code = http.StatusBadRequest
res.Message = err.Error()
return nil, &res
}
res.Code = http.StatusInternalServerError
for _, blockdReq = range hostBlockd {
for _, blockdCur = range srv.env.HostBlockd {
if blockdReq.Name != blockdCur.Name {
continue
}
if blockdReq.IsEnabled == blockdCur.IsEnabled {
break
}
if blockdReq.IsEnabled {
err = srv.blockdEnable(blockdCur)
if err != nil {
res.Message = err.Error()
return nil, &res
}
} else {
err = srv.blockdDisable(blockdCur)
if err != nil {
res.Message = err.Error()
return nil, &res
}
blockdCur.IsEnabled = false
}
}
}
err = srv.env.write(srv.env.fileConfig)
if err != nil {
log.Printf("%s: %s", logp, err.Error())
res.Message = err.Error()
return nil, &res
}
res.Code = http.StatusOK
res.Data = hostBlockd
return json.Marshal(&res)
}
func (srv *Server) blockdEnable(hb *Blockd) (err error) {
var (
logp = "blockdEnable"
hfile *dns.HostsFile
)
err = hb.enable()
if err != nil {
return fmt.Errorf("%s: %w", logp, err)
}
err = hb.update()
if err != nil {
return fmt.Errorf("%s: %w", logp, err)
}
hfile, err = dns.ParseHostsFile(hb.file)
if err != nil {
return fmt.Errorf("%s: %w", logp, err)
}
err = srv.dns.Caches.InternalPopulateRecords(hfile.Records, hfile.Path)
if err != nil {
return fmt.Errorf("%s: %w", logp, err)
}
srv.env.hostBlockdFile[hfile.Name] = hfile
return nil
}
func (srv *Server) blockdDisable(hb *Blockd) (err error) {
var (
logp = "blockdDisable"
hfile *dns.HostsFile
)
hfile = srv.env.hostBlockdFile[hb.Name]
if hfile == nil {
return fmt.Errorf("%s: unknown hosts block: %q", logp, hb.Name)
}
srv.dns.Caches.InternalRemoveNames(hfile.Names())
err = hb.disable()
if err != nil {
return fmt.Errorf("%s: %w", logp, err)
}
delete(srv.env.hostBlockdFile, hfile.Name)
return nil
}
// apiHostsdCreate create new hosts file inside the hosts.d directory with the
// name from request parameter.
//
// # Request
//
// POST /api/hosts.d
// Content-Type: application/x-www-form-urlencoded
//
// name=<hosts file name>
//
// # Response
//
// On success it will return the HostsFile object in JSON format.
//
// Content-Type: application/json
//
// {
// "code": 200,
// "data": <HostsFile>
// }
//
// This API is idempotent, which means, calling this API several times with
// same name will return the same HostsFile object.
func (srv *Server) apiHostsdCreate(epr *libhttp.EndpointRequest) (resbody []byte, err error) {
var (
res = libhttp.EndpointResponse{}
name = epr.HTTPRequest.Form.Get(paramNameName)
hfile *dns.HostsFile
path string
)
if len(name) == 0 {
res.Code = http.StatusBadRequest
res.Message = "parameter hosts file name is empty"
return nil, &res
}
hfile = srv.env.hostsd[name]
if hfile == nil {
path = filepath.Join(srv.env.pathDirHosts, name)
hfile, err = dns.NewHostsFile(path, nil)
if err != nil {
res.Code = http.StatusInternalServerError
res.Message = err.Error()
return nil, &res
}
srv.env.hostsd[hfile.Name] = hfile
}
res.Code = http.StatusOK
res.Message = fmt.Sprintf("Hosts file %q has been created", name)
res.Data = hfile
return json.Marshal(&res)
}
// apiHostsdDelete delete a hosts file by name in hosts.d directory.
//
// # Request
//
// DELETE /api/hosts.d?name=<name>
//
// # Response
//
// On success, if the hosts file name exists, the local caches associated with
// hosts file will be removed and the hosts file will be deleted.
// Server will return the deleted HostsFile object in JSON format,
//
// Content-Type: application/json
//
// {
// "code": 200,
// "data": <HostsFile>
// }
//
// On fail server will return 4xx or 5xx HTTP status code.
func (srv *Server) apiHostsdDelete(epr *libhttp.EndpointRequest) (resbody []byte, err error) {
var (
res = libhttp.EndpointResponse{}
name = epr.HTTPRequest.Form.Get(paramNameName)
hfile *dns.HostsFile
found bool
)
if len(name) == 0 {
res.Code = http.StatusBadRequest
res.Message = "empty or invalid parameter for host file name"
return nil, &res
}
hfile, found = srv.env.hostsd[name]
if !found {
res.Code = http.StatusBadRequest
res.Message = fmt.Sprintf("hosts file %s not found", name)
return nil, &res
}
// Remove the records associated with hosts file.
srv.dns.Caches.InternalRemoveNames(hfile.Names())
err = hfile.Delete()
if err != nil {
res.Code = http.StatusInternalServerError
res.Message = err.Error()
return nil, &res
}
delete(srv.env.hostsd, name)
res.Code = http.StatusOK
res.Message = name + " has been deleted"
res.Data = hfile
return json.Marshal(&res)
}
// apiHostsdGet get the content of hosts file inside hosts.d by its file name.
//
// # Request
//
// Format,
//
// GET /api/hosts.d?name=<name>
//
// Parameters,
//
// - name: string, optional, the name of hosts file where content to be
// fetch.
// If its empty, it will return all hosts files.
//
// # Response
//
// On success, it will return list of resource record in JSON format.
func (srv *Server) apiHostsdGet(epr *libhttp.EndpointRequest) (resbody []byte, err error) {
var (
res = libhttp.EndpointResponse{}
name = epr.HTTPRequest.Form.Get(paramNameName)
hf *dns.HostsFile
found bool
)
name = strings.TrimSpace(name)
if len(name) == 0 {
res.Code = http.StatusOK
res.Data = srv.env.hostsd
return json.Marshal(&res)
}
hf, found = srv.env.hostsd[name]
if !found {
res.Code = http.StatusNotFound
res.Message = "invalid or empty hosts file " + name
return nil, &res
}
if hf.Records == nil || cap(hf.Records) == 0 {
hf.Records = make([]*dns.ResourceRecord, 0, 1)
}
res.Code = http.StatusOK
res.Data = hf.Records
return json.Marshal(&res)
}
// apiHostsdRecordAdd add new record and save it to the hosts file.
//
// # Request
//
// Request format,
//
// POST /api/hosts.d/rr
// content-type: application/x-www-form-urlencoded
//
// name=&domain=&value=
//
// Parameters,
//
// - name: the hosts file name where record to be added.
// - domain: the domain name.
// - value: the IPv4 or IPv6 address of domain name.
//
// If the domain name already exist, the new record will be appended to the
// end of file.
//
// # Response
//
// On success, a single line "<domain> <value>" will be appended to the hosts
// file as new record and return it to the caller.
func (srv *Server) apiHostsdRecordAdd(epr *libhttp.EndpointRequest) (resbody []byte, err error) {
var (
res = libhttp.EndpointResponse{}
hostsFileName = epr.HTTPRequest.Form.Get(paramNameName)
hfile *dns.HostsFile