frp/pkg/util/vhost/vhost.go

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// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package vhost
import (
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"context"
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"fmt"
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"net"
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"strings"
"time"
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"github.com/fatedier/frp/pkg/util/log"
frpNet "github.com/fatedier/frp/pkg/util/net"
"github.com/fatedier/frp/pkg/util/xlog"
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"github.com/fatedier/golib/errors"
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)
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type RouteInfo string
const (
RouteInfoURL RouteInfo = "url"
RouteInfoHost RouteInfo = "host"
RouteInfoRemote RouteInfo = "remote"
)
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type muxFunc func(net.Conn) (net.Conn, map[string]string, error)
type httpAuthFunc func(net.Conn, string, string, string) (bool, error)
type hostRewriteFunc func(net.Conn, string) (net.Conn, error)
type successFunc func(net.Conn) error
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type Muxer struct {
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listener net.Listener
timeout time.Duration
vhostFunc muxFunc
authFunc httpAuthFunc
successFunc successFunc
rewriteFunc hostRewriteFunc
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registryRouter *Routers
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}
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func NewMuxer(listener net.Listener, vhostFunc muxFunc, authFunc httpAuthFunc, successFunc successFunc, rewriteFunc hostRewriteFunc, timeout time.Duration) (mux *Muxer, err error) {
mux = &Muxer{
listener: listener,
timeout: timeout,
vhostFunc: vhostFunc,
authFunc: authFunc,
successFunc: successFunc,
rewriteFunc: rewriteFunc,
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registryRouter: NewRouters(),
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}
go mux.run()
return mux, nil
}
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type CreateConnFunc func(remoteAddr string) (net.Conn, error)
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// RouteConfig is the params used to match HTTP requests
type RouteConfig struct {
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Domain string
Location string
RewriteHost string
Username string
Password string
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Headers map[string]string
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CreateConnFn CreateConnFunc
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}
// listen for a new domain name, if rewriteHost is not empty and rewriteFunc is not nil
// then rewrite the host header to rewriteHost
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func (v *Muxer) Listen(ctx context.Context, cfg *RouteConfig) (l *Listener, err error) {
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l = &Listener{
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name: cfg.Domain,
location: cfg.Location,
rewriteHost: cfg.RewriteHost,
userName: cfg.Username,
passWord: cfg.Password,
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mux: v,
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accept: make(chan net.Conn),
ctx: ctx,
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}
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err = v.registryRouter.Add(cfg.Domain, cfg.Location, l)
if err != nil {
return
}
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return l, nil
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}
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func (v *Muxer) getListener(name, path string) (l *Listener, exist bool) {
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// first we check the full hostname
// if not exist, then check the wildcard_domain such as *.example.com
vr, found := v.registryRouter.Get(name, path)
if found {
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return vr.payload.(*Listener), true
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}
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domainSplit := strings.Split(name, ".")
if len(domainSplit) < 3 {
return
}
for {
if len(domainSplit) < 3 {
return
}
domainSplit[0] = "*"
name = strings.Join(domainSplit, ".")
vr, found = v.registryRouter.Get(name, path)
if found {
return vr.payload.(*Listener), true
}
domainSplit = domainSplit[1:]
}
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}
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func (v *Muxer) run() {
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for {
conn, err := v.listener.Accept()
if err != nil {
return
}
go v.handle(conn)
}
}
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func (v *Muxer) handle(c net.Conn) {
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if err := c.SetDeadline(time.Now().Add(v.timeout)); err != nil {
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c.Close()
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return
}
sConn, reqInfoMap, err := v.vhostFunc(c)
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if err != nil {
log.Debug("get hostname from http/https request error: %v", err)
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c.Close()
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return
}
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name := strings.ToLower(reqInfoMap["Host"])
path := strings.ToLower(reqInfoMap["Path"])
l, ok := v.getListener(name, path)
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if !ok {
res := notFoundResponse()
res.Write(c)
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log.Debug("http request for host [%s] path [%s] not found", name, path)
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c.Close()
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return
}
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xl := xlog.FromContextSafe(l.ctx)
if v.successFunc != nil {
if err := v.successFunc(c); err != nil {
xl.Info("success func failure on vhost connection: %v", err)
c.Close()
return
}
}
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// if authFunc is exist and userName/password is set
// then verify user access
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if l.mux.authFunc != nil && l.userName != "" && l.passWord != "" {
bAccess, err := l.mux.authFunc(c, l.userName, l.passWord, reqInfoMap["Authorization"])
if bAccess == false || err != nil {
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xl.Debug("check http Authorization failed")
res := noAuthResponse()
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res.Write(c)
c.Close()
return
}
}
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if err = sConn.SetDeadline(time.Time{}); err != nil {
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c.Close()
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return
}
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c = sConn
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xl.Debug("get new http request host [%s] path [%s]", name, path)
err = errors.PanicToError(func() {
l.accept <- c
})
if err != nil {
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xl.Warn("listener is already closed, ignore this request")
}
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}
type Listener struct {
name string
location string
rewriteHost string
userName string
passWord string
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mux *Muxer // for closing Muxer
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accept chan net.Conn
ctx context.Context
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}
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func (l *Listener) Accept() (net.Conn, error) {
xl := xlog.FromContextSafe(l.ctx)
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conn, ok := <-l.accept
if !ok {
return nil, fmt.Errorf("Listener closed")
}
// if rewriteFunc is exist
// rewrite http requests with a modified host header
// if l.rewriteHost is empty, nothing to do
if l.mux.rewriteFunc != nil {
sConn, err := l.mux.rewriteFunc(conn, l.rewriteHost)
if err != nil {
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xl.Warn("host header rewrite failed: %v", err)
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return nil, fmt.Errorf("host header rewrite failed")
}
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xl.Debug("rewrite host to [%s] success", l.rewriteHost)
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conn = sConn
}
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return frpNet.NewContextConn(l.ctx, conn), nil
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}
func (l *Listener) Close() error {
l.mux.registryRouter.Del(l.name, l.location)
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close(l.accept)
return nil
}
func (l *Listener) Name() string {
return l.name
}
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func (l *Listener) Addr() net.Addr {
return (*net.TCPAddr)(nil)
}