148 lines
3.1 KiB
Go
148 lines
3.1 KiB
Go
package adapters
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import (
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"bufio"
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"bytes"
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"io"
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"net"
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"net/http"
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"strings"
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C "github.com/Dreamacro/clash/constant"
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)
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type PeekedConn struct {
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net.Conn
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Peeked []byte
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host string
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isHTTP bool
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}
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func (c *PeekedConn) Read(p []byte) (n int, err error) {
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if len(c.Peeked) > 0 {
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n = copy(p, c.Peeked)
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c.Peeked = c.Peeked[n:]
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if len(c.Peeked) == 0 {
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c.Peeked = nil
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}
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return n, nil
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}
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// Sometimes firefox just open a socket to process multiple domains in HTTP
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// The temporary solution is to return io.EOF when encountering different HOST
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if c.isHTTP {
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br := bufio.NewReader(bytes.NewReader(p))
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_, hostName := ParserHTTPHostHeader(br)
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if hostName != "" {
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if !strings.Contains(hostName, ":") {
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hostName += ":80"
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}
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if hostName != c.host {
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return 0, io.EOF
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}
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}
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}
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return c.Conn.Read(p)
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}
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type HttpAdapter struct {
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addr *C.Addr
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conn *PeekedConn
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}
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func (h *HttpAdapter) Close() {
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h.conn.Close()
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}
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func (h *HttpAdapter) Addr() *C.Addr {
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return h.addr
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}
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func (h *HttpAdapter) Conn() net.Conn {
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return h.conn
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}
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func NewHttp(host string, peeked []byte, isHTTP bool, conn net.Conn) *HttpAdapter {
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return &HttpAdapter{
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addr: parseHttpAddr(host),
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conn: &PeekedConn{
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Peeked: peeked,
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Conn: conn,
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host: host,
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isHTTP: isHTTP,
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},
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}
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}
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// ParserHTTPHostHeader returns the HTTP Host header from br without
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// consuming any of its bytes. It returns "" if it can't find one.
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func ParserHTTPHostHeader(br *bufio.Reader) (method, host string) {
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// br := bufio.NewReader(bytes.NewReader(data))
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const maxPeek = 4 << 10
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peekSize := 0
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for {
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peekSize++
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if peekSize > maxPeek {
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b, _ := br.Peek(br.Buffered())
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return method, httpHostHeaderFromBytes(b)
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}
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b, err := br.Peek(peekSize)
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if n := br.Buffered(); n > peekSize {
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b, _ = br.Peek(n)
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peekSize = n
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}
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if len(b) > 0 {
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if b[0] < 'A' || b[0] > 'Z' {
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// Doesn't look like an HTTP verb
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// (GET, POST, etc).
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return
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}
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if bytes.Index(b, crlfcrlf) != -1 || bytes.Index(b, lflf) != -1 {
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req, err := http.ReadRequest(bufio.NewReader(bytes.NewReader(b)))
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if err != nil {
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return
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}
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if len(req.Header["Host"]) > 1 {
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// TODO(bradfitz): what does
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// ReadRequest do if there are
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// multiple Host headers?
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return
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}
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return req.Method, req.Host
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}
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}
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if err != nil {
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return method, httpHostHeaderFromBytes(b)
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}
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}
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}
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var (
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lfHostColon = []byte("\nHost:")
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lfhostColon = []byte("\nhost:")
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crlf = []byte("\r\n")
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lf = []byte("\n")
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crlfcrlf = []byte("\r\n\r\n")
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lflf = []byte("\n\n")
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)
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func httpHostHeaderFromBytes(b []byte) string {
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if i := bytes.Index(b, lfHostColon); i != -1 {
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return string(bytes.TrimSpace(untilEOL(b[i+len(lfHostColon):])))
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}
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if i := bytes.Index(b, lfhostColon); i != -1 {
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return string(bytes.TrimSpace(untilEOL(b[i+len(lfhostColon):])))
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}
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return ""
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}
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// untilEOL returns v, truncated before the first '\n' byte, if any.
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// The returned slice may include a '\r' at the end.
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func untilEOL(v []byte) []byte {
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if i := bytes.IndexByte(v, '\n'); i != -1 {
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return v[:i]
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}
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return v
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}
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