Xray-core/common/protocol/http/sniff.go
风扇滑翔翼 88ae774cce
Sniff: Routing “attrs” support non http inbound (#3808)
* Sniff: Support attrs route in non http inbound

* Add capability to sniff method and path

* Fix test

* Skip HTTP inbound PlainHTTP mode

* Fix test
again
2024-09-13 12:26:36 -04:00

118 lines
2.4 KiB
Go

package http
import (
"bytes"
"context"
"errors"
"strings"
"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/session"
)
type version byte
const (
HTTP1 version = iota
HTTP2
)
type SniffHeader struct {
version version
host string
}
func (h *SniffHeader) Protocol() string {
switch h.version {
case HTTP1:
return "http1"
case HTTP2:
return "http2"
default:
return "unknown"
}
}
func (h *SniffHeader) Domain() string {
return h.host
}
var (
methods = [...]string{"get", "post", "head", "put", "delete", "options", "connect"}
errNotHTTPMethod = errors.New("not an HTTP method")
)
func beginWithHTTPMethod(b []byte) error {
for _, m := range &methods {
if len(b) >= len(m) && strings.EqualFold(string(b[:len(m)]), m) {
return nil
}
if len(b) < len(m) {
return common.ErrNoClue
}
}
return errNotHTTPMethod
}
func SniffHTTP(b []byte, c context.Context) (*SniffHeader, error) {
content := session.ContentFromContext(c)
ShouldSniffAttr := true
// If content.Attributes have information, that means it comes from HTTP inbound PlainHTTP mode.
// It will set attributes, so skip it.
if content == nil || len(content.Attributes) != 0 {
ShouldSniffAttr = false
}
if err := beginWithHTTPMethod(b); err != nil {
return nil, err
}
sh := &SniffHeader{
version: HTTP1,
}
headers := bytes.Split(b, []byte{'\n'})
for i := 1; i < len(headers); i++ {
header := headers[i]
if len(header) == 0 {
break
}
parts := bytes.SplitN(header, []byte{':'}, 2)
if len(parts) != 2 {
continue
}
key := strings.ToLower(string(parts[0]))
value := string(bytes.TrimSpace(parts[1]))
if ShouldSniffAttr {
content.SetAttribute(key, value) // Put header in attribute
}
if key == "host" {
rawHost := strings.ToLower(value)
dest, err := ParseHost(rawHost, net.Port(80))
if err != nil {
return nil, err
}
sh.host = dest.Address.String()
}
}
// Parse request line
// Request line is like this
// "GET /homo/114514 HTTP/1.1"
if len(headers) > 0 && ShouldSniffAttr {
RequestLineParts := bytes.Split(headers[0], []byte{' '})
if len(RequestLineParts) == 3 {
content.SetAttribute(":method", string(RequestLineParts[0]))
content.SetAttribute(":path", string(RequestLineParts[1]))
}
}
if len(sh.host) > 0 {
return sh, nil
}
return nil, common.ErrNoClue
}