mirror of
https://github.com/e1732a364fed/v2ray_simple.git
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187 lines
4.9 KiB
Go
187 lines
4.9 KiB
Go
/*
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Package httpLayer provides methods for parsing and sending http request and response.
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Fallback 由 本包 处理. 因为回落的目标只可能是http服务器.
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http头 格式 可以参考：
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https://datatracker.ietf.org/doc/html/rfc2616#section-4
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https://datatracker.ietf.org/doc/html/rfc2616#section-5
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V2ray 兼容性
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http头我们希望能够完全兼容 v2ray的行为。
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观察v2ray的实现，在没有header时，还会添加一个 Date ，这个v2ray的文档里没提
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v2ray文档: https://www.v2fly.org/config/transport/tcp.html#noneheaderobject
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相关 v2ray代码: https://github.com/v2fly/v2ray-core/tree/master/transport/internet/headers/http/http.go
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我们虽然宣称兼容 v2ray，但在对于这种 不在 v2ray文档里提及的 代码实现, 我们不予支持。
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*/
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package httpLayer
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import (
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"bytes"
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"io"
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"net"
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"strings"
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"time"
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"github.com/e1732a364fed/v2ray_simple/utils"
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"net/http"
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"net/http/httptest"
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)
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const (
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Err403response = "HTTP/1.1 403 Forbidden\r\nConnection: close\r\nCache-Control: max-age=3600, public\r\nContent-Length: 0\r\n\r\n"
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H11_Str = "http/1.1"
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H2_Str = "h2"
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CRLF = "\r\n"
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//参考 https://datatracker.ietf.org/doc/html/rfc2616#section-4.1
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//
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//http头的尾部. 每个header末尾都有一个 crlf, 整个头部结尾还有一个crlf, 所以是两个.
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HeaderENDING = CRLF + CRLF
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//我们不使用v2ray的8k的最大header长度限制，因为这反倒会探测出特殊性。http标准是最大1MB。
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XForwardStr = "X-Forwarded-For"
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)
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var (
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HeaderENDING_bytes = []byte(HeaderENDING)
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ErrNotHTTP_Request = utils.InvalidDataErr("not http request")
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Err400response_golang string
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)
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func init() {
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//使用 httptest 包 来完美重现 golang的http包的 notfound, 可以随golang具体实现而同步变化
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req := httptest.NewRequest("GET", "http://exam.com/", nil)
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w := httptest.NewRecorder()
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http.NotFound(w, req)
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buf := &bytes.Buffer{}
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w.Result().Write(buf)
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Err400response_golang = buf.String()
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}
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type RequestErr struct {
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Path string
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Method string
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}
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func (e *RequestErr) Is(err error) bool {
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if err == nil {
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return false
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}
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if re, ok := err.(*RequestErr); ok && re != nil {
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return (e.Path == re.Path && e.Method == re.Path)
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}
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if err == utils.ErrInvalidData {
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return true
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}
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return false
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}
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func (e *RequestErr) Error() string {
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var sb strings.Builder
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sb.WriteString("InvaidRequest ")
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sb.WriteString(e.Method)
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sb.WriteString(",")
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sb.WriteString(e.Path)
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return sb.String()
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}
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// H1RequestParser被用于 预读一个链接，判断该连接是否是有效的http请求,
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// 并将Version，Path，Method 记录在结构中.
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//
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// 只能过滤 http 0.9, 1.0 和 1.1. 无法过滤h2和h3.
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type H1RequestParser struct {
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Version string
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Path string
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Method string
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WholeRequestBuf *bytes.Buffer
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Failreason int //为0表示没错误
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Headers []RawHeader
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}
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// 尝试读取数据并解析HTTP请求, 解析的 数据会存入 RequestParser 结构中.
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//如果读取错误,会返回该错误; 如果读到的不是HTTP请求，返回 的err 的 errors.Is(err,ErrNotHTTP_Request) == true;
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//
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// 该函数有个小问题,就是如果一次Read是短Read（可能是网络原因），没读完整个http头部，则仍然会认为是错误
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func (rhr *H1RequestParser) ReadAndParse(r io.Reader) error {
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bs := utils.GetPacket()
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n, e := r.Read(bs)
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if e != nil {
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return e
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}
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data := bs[:n]
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buf := bytes.NewBuffer(data)
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rhr.WholeRequestBuf = buf
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rhr.Version, rhr.Method, rhr.Path, rhr.Headers, rhr.Failreason = ParseH1Request(data, false)
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if rhr.Failreason != 0 {
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return utils.ErrInErr{ErrDesc: "httpLayer ReadAndParse failed", ErrDetail: ErrNotHTTP_Request, Data: rhr.Failreason}
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}
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return nil
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}
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//第一次没读完后，再读一遍
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func (rhr *H1RequestParser) ReadAndParse_2(r net.Conn) error {
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bs := utils.GetPacket()
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n, e := r.Read(bs)
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if e != nil {
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return e
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}
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data := bs[:n]
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buf := bytes.NewBuffer(data)
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rhr.WholeRequestBuf = buf
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rhr.Version, rhr.Method, rhr.Path, rhr.Headers, rhr.Failreason = ParseH1Request(data, false)
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if rhr.Failreason == Fail_no_endMark {
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r.SetReadDeadline(time.Now().Add(time.Millisecond * 200))
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n2, e2 := r.Read(bs[n:])
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r.SetReadDeadline(time.Time{})
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if e2 != nil && n2 <= 0 {
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return utils.ErrInErr{ErrDesc: "httpLayer ReadAndParse failed", ErrDetail: ErrNotHTTP_Request, Data: []interface{}{rhr.Failreason, e2}}
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} else {
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data2 := bs[:n+rhr.WholeRequestBuf.Len()]
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buf2 := bytes.NewBuffer(data2)
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rhr.WholeRequestBuf = buf2
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rhr.Version, rhr.Method, rhr.Path, rhr.Headers, rhr.Failreason = ParseH1Request(buf2.Bytes(), false)
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if rhr.Failreason != 0 {
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return utils.ErrInErr{ErrDesc: "httpLayer ReadAndParse failed", ErrDetail: ErrNotHTTP_Request, Data: rhr.Failreason}
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}
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}
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} else if rhr.Failreason != 0 {
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return utils.ErrInErr{ErrDesc: "httpLayer ReadAndParse failed", ErrDetail: ErrNotHTTP_Request, Data: rhr.Failreason}
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}
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return nil
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}
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