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feat: support http2 and grpc, parse grpc content, partially
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,208 +1,95 @@ | ||
| package protocol | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/binary" | ||
| "encoding/hex" | ||
| "fmt" | ||
| "io" | ||
| "strings" | ||
|
|
||
| "github.com/fatih/color" | ||
| "github.com/kevwan/tproxy/display" | ||
| "golang.org/x/net/http2" | ||
| "golang.org/x/net/http2/hpack" | ||
| "google.golang.org/protobuf/encoding/protowire" | ||
| ) | ||
|
|
||
| const ( | ||
| http2HeaderLen = 9 | ||
| http2Preface = "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n" | ||
| http2SettingsPayloadLen = 6 | ||
| ) | ||
|
|
||
| type GrpcInterop struct{} | ||
|
|
||
| func (i *GrpcInterop) Dump(r io.Reader, source string, id int, quiet bool) { | ||
| i.readPreface(r, source, id) | ||
|
|
||
| data := make([]byte, bufferSize) | ||
| for { | ||
| n, err := r.Read(data) | ||
| if n > 0 && !quiet { | ||
| var buf strings.Builder | ||
| buf.WriteString(color.HiGreenString("from %s [%d]\n", source, id)) | ||
|
|
||
| var index int | ||
| for index < n { | ||
| frameInfo, moreInfo, offset := i.explain(data[index:n]) | ||
| buf.WriteString(fmt.Sprintf("%s%s%s\n", | ||
| color.HiBlueString("%s:(", grpcProtocol), | ||
| color.HiYellowString(frameInfo), | ||
| color.HiBlueString(")"))) | ||
| end := index + offset | ||
| if end > n { | ||
| end = n | ||
| } | ||
| buf.WriteString(fmt.Sprint(hex.Dump(data[index:end]))) | ||
| if len(moreInfo) > 0 { | ||
| buf.WriteString(fmt.Sprintf("\n%s\n\n", strings.TrimSpace(moreInfo))) | ||
| } | ||
| index += offset | ||
| } | ||
|
|
||
| display.PrintfWithTime("%s\n\n", strings.TrimSpace(buf.String())) | ||
| } | ||
| if err != nil && err != io.EOF { | ||
| fmt.Printf("unable to read data %v", err) | ||
| break | ||
| } | ||
| if n == 0 { | ||
| break | ||
| } | ||
| } | ||
| } | ||
| type grpcExplainer struct{} | ||
|
|
||
| func (i *GrpcInterop) explain(b []byte) (string, string, int) { | ||
| if len(b) < http2HeaderLen { | ||
| return "", "", len(b) | ||
| func (g *grpcExplainer) explain(b []byte) string { | ||
| if len(b) < grpcHeaderLen { | ||
| return "" | ||
| } | ||
|
|
||
| frame, err := http2.ReadFrameHeader(bytes.NewReader(b[:http2HeaderLen])) | ||
| if err != nil { | ||
| return "", "", len(b) | ||
| if int(b[0]) == 1 { | ||
| return "" | ||
| } | ||
|
|
||
| frameLen := http2HeaderLen + int(frame.Length) | ||
| switch frame.Type { | ||
| case http2.FrameSettings: | ||
| switch frame.Flags { | ||
| case http2.FlagSettingsAck: | ||
| return "http2:settings:ack", "", frameLen | ||
| default: | ||
| return i.explainSettings(b[http2HeaderLen:frameLen]), "", frameLen | ||
| } | ||
| case http2.FramePing: | ||
| id := hex.EncodeToString(b[http2HeaderLen:frameLen]) | ||
| switch frame.Flags { | ||
| case http2.FlagPingAck: | ||
| return fmt.Sprintf("http2:ping:ack %s", id), "", frameLen | ||
| default: | ||
| return fmt.Sprintf("http2:ping %s", id), "", frameLen | ||
| } | ||
| case http2.FrameWindowUpdate: | ||
| increment := binary.BigEndian.Uint32(b[http2HeaderLen : http2HeaderLen+4]) | ||
| return fmt.Sprintf("http2:window_update window_size_increment:%d", increment), "", frameLen | ||
| case http2.FrameHeaders: | ||
| info, headers := i.explainHeaders(frame, b[http2HeaderLen:frameLen]) | ||
| var builder strings.Builder | ||
| for _, header := range headers { | ||
| builder.WriteString(fmt.Sprintf("%s: %s\n", header.Name, header.Value)) | ||
| } | ||
| return info, builder.String(), frameLen | ||
| b = b[1:] | ||
| // 4 bytes as the pb message length | ||
| size := binary.BigEndian.Uint32(b) | ||
| b = b[4:] | ||
| if len(b) < int(size) { | ||
| return "" | ||
| } | ||
|
|
||
| if frame.StreamID > 0 { | ||
| if frame.Flags == http2.FlagDataEndStream { | ||
| return fmt.Sprintf("http2:%s stream:%d end_stream", | ||
| strings.ToLower(frame.Type.String()), frame.StreamID), "", frameLen | ||
| } | ||
|
|
||
| desc := fmt.Sprintf("http2:%s stream:%d", strings.ToLower(frame.Type.String()), frame.StreamID) | ||
| return desc, "", frameLen | ||
| } | ||
|
|
||
| return "http2:" + strings.ToLower(frame.Type.String()), "", frameLen | ||
| var builder strings.Builder | ||
| g.explainFields(b[:size], &builder, 0) | ||
| return builder.String() | ||
| } | ||
|
|
||
| func (i *GrpcInterop) explainHeaders(frame http2.FrameHeader, b []byte) (string, []hpack.HeaderField) { | ||
| var padded int | ||
| var weight int | ||
| if frame.Flags&http2.FlagHeadersPadded != 0 { | ||
| padded = int(b[0]) | ||
| b = b[1 : len(b)-padded] | ||
| } | ||
| if frame.Flags&http2.FlagHeadersPriority != 0 { | ||
| b = b[4:] | ||
| weight = int(b[0]) | ||
| b = b[1:] | ||
| } | ||
|
|
||
| var buf strings.Builder | ||
| buf.WriteString(fmt.Sprintf("http2:headers stream:%d", frame.StreamID)) | ||
|
|
||
| switch { | ||
| case frame.Flags&http2.FlagHeadersEndStream != 0: | ||
| buf.WriteString(" end_stream") | ||
| case frame.Flags&http2.FlagHeadersEndHeaders != 0: | ||
| buf.WriteString(" end_headers") | ||
| case frame.Flags&http2.FlagHeadersPadded != 0: | ||
| buf.WriteString(" padded") | ||
| case frame.Flags&http2.FlagHeadersPriority != 0: | ||
| buf.WriteString(" priority") | ||
| } | ||
|
|
||
| if weight > 0 { | ||
| buf.WriteString(fmt.Sprintf(" weight:%d", weight)) | ||
| } | ||
|
|
||
| if frame.Flags&http2.FlagHeadersEndStream != 0 || frame.Flags&http2.FlagHeadersEndHeaders != 0 { | ||
| headers, err := hpack.NewDecoder(0, nil).DecodeFull(b) | ||
| if err != nil { | ||
| return buf.String(), nil | ||
| func (g *grpcExplainer) explainFields(b []byte, builder *strings.Builder, depth int) bool { | ||
| for len(b) > 0 { | ||
| num, tp, n := protowire.ConsumeTag(b) | ||
| if n < 0 { | ||
| return false | ||
| } | ||
| b = b[n:] | ||
|
|
||
| return buf.String(), headers | ||
| } | ||
|
|
||
| return buf.String(), nil | ||
| } | ||
|
|
||
| func (i *GrpcInterop) explainSettings(b []byte) string { | ||
| var builder strings.Builder | ||
|
|
||
| builder.WriteString("http2:settings") | ||
| for i := 0; i < len(b)/http2SettingsPayloadLen; i++ { | ||
| start := i * http2SettingsPayloadLen | ||
| flag := binary.BigEndian.Uint16(b[start : start+2]) | ||
| value := binary.BigEndian.Uint32(b[start+2 : start+http2SettingsPayloadLen]) | ||
|
|
||
| switch http2.SettingID(flag) { | ||
| case http2.SettingHeaderTableSize: | ||
| builder.WriteString(fmt.Sprintf(" header_table_size:%d", value)) | ||
| case http2.SettingEnablePush: | ||
| builder.WriteString(fmt.Sprintf(" enable_push:%d", value)) | ||
| case http2.SettingMaxConcurrentStreams: | ||
| builder.WriteString(fmt.Sprintf(" max_concurrent_streams:%d", value)) | ||
| case http2.SettingInitialWindowSize: | ||
| builder.WriteString(fmt.Sprintf(" initial_window_size:%d", value)) | ||
| case http2.SettingMaxFrameSize: | ||
| builder.WriteString(fmt.Sprintf(" max_frame_size:%d", value)) | ||
| case http2.SettingMaxHeaderListSize: | ||
| builder.WriteString(fmt.Sprintf(" max_header_list_size:%d", value)) | ||
| switch tp { | ||
| case protowire.VarintType: | ||
| _, n = protowire.ConsumeVarint(b) | ||
| if n < 0 { | ||
| return false | ||
| } | ||
| b = b[n:] | ||
| write(builder, fmt.Sprintf("#%d: (varint)\n", num), depth) | ||
| case protowire.Fixed32Type: | ||
| _, n = protowire.ConsumeFixed32(b) | ||
| if n < 0 { | ||
| return false | ||
| } | ||
| b = b[n:] | ||
| write(builder, fmt.Sprintf("#%d: (fixed32)\n", num), depth) | ||
| case protowire.Fixed64Type: | ||
| _, n = protowire.ConsumeFixed64(b) | ||
| if n < 0 { | ||
| return false | ||
| } | ||
| b = b[n:] | ||
| write(builder, fmt.Sprintf("#%d: (fixed64)\n", num), depth) | ||
| case protowire.BytesType: | ||
| v, n := protowire.ConsumeBytes(b) | ||
| if n < 0 { | ||
| return false | ||
| } | ||
| var buf strings.Builder | ||
| if g.explainFields(b[1:n], &buf, depth+1) { | ||
| write(builder, fmt.Sprintf("#%d:\n", num), depth) | ||
| builder.WriteString(buf.String()) | ||
| } else { | ||
| write(builder, fmt.Sprintf("#%d: %s\n", num, v), depth) | ||
| } | ||
| b = b[n:] | ||
| default: | ||
| _, _, n = protowire.ConsumeField(b) | ||
| if n < 0 { | ||
| return false | ||
| } | ||
| b = b[n:] | ||
| } | ||
| } | ||
|
|
||
| return builder.String() | ||
| return true | ||
| } | ||
|
|
||
| func (i *GrpcInterop) readPreface(r io.Reader, source string, id int) { | ||
| if source != ClientSide { | ||
| return | ||
| } | ||
|
|
||
| preface := make([]byte, len(http2Preface)) | ||
| n, err := r.Read(preface) | ||
| if err != nil || n < len(http2Preface) { | ||
| return | ||
| func write(builder *strings.Builder, val string, depth int) { | ||
| for i := 0; i < depth; i++ { | ||
| builder.WriteString(" ") | ||
| } | ||
|
|
||
| fmt.Println() | ||
| var builder strings.Builder | ||
| builder.WriteString(color.HiGreenString("from %s [%d]\n", source, id)) | ||
| builder.WriteString(fmt.Sprintf("%s%s%s\n", | ||
| color.HiBlueString("%s:(", grpcProtocol), | ||
| color.YellowString("http2:preface"), | ||
| color.HiBlueString(")"))) | ||
| builder.WriteString(fmt.Sprint(hex.Dump(preface))) | ||
| display.PrintlnWithTime(builder.String()) | ||
| builder.WriteString(val) | ||
| } |
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