116 lines
2.4 KiB
Go
116 lines
2.4 KiB
Go
package protocol
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import (
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"bufio"
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"bytes"
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"fmt"
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"net/http"
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)
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func init() {
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Register(Client, "", detectHTTPRequest)
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Register(Server, "HTTP/?.", detectHTTPResponse)
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}
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func detectHTTPRequest(dir Direction, data []byte, srcPort, dstPort int) (proto *Protocol, confidence float64) {
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// A minimal request "GET / HTTP/1.0\r\n" is > 8 bytes.
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if len(data) < 8 {
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return nil, 0
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}
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switch dstPort {
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case 80, 8080: // Common HTTP ports
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confidence = +.1
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case 3128: // Common HTTP proxy port
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confidence = -.1
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}
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if Strict {
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var (
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b = append(data, '\r', '\n')
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r = bufio.NewReader(bytes.NewReader(b))
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)
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if request, err := http.ReadRequest(r); err == nil {
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return &Protocol{
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Name: ProtocolHTTP,
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Version: Version{
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Major: request.ProtoMajor,
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Minor: request.ProtoMinor,
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Patch: -1,
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},
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}, confidence + .85
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}
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return nil, 0
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}
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crlfIndex := bytes.IndexFunc(data, func(r rune) bool {
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return r == '\r' || r == '\n'
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})
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if crlfIndex == -1 {
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return nil, 0
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}
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// A request has three, space-separated parts.
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part := bytes.Split(data[:crlfIndex], []byte(" "))
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if len(part) != 3 {
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return nil, 0
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}
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// The last part starts with "HTTP/".
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if !bytes.HasPrefix(part[2], []byte("HTTP/1")) {
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return nil, 0
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}
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var version = Version{Patch: -1}
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_, _ = fmt.Sscanf(string(part[2]), "HTTP/%d.%d ", &version.Major, &version.Minor)
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return &Protocol{
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Name: ProtocolHTTP,
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Version: version,
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}, confidence + .75
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}
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func detectHTTPResponse(dir Direction, data []byte, srcPort, dstPort int) (proto *Protocol, confidence float64) {
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if !dir.Contains(Server) {
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return nil, 0
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}
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// A minimal response "HTTP/1.0 200 OK\r\n" is > 8 bytes.
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if len(data) < 8 {
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return nil, 0
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}
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switch srcPort {
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case 80, 8080: // Common HTTP ports
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confidence = +.1
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case 3128: // Common HTTP proxy port
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confidence = -.1
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}
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if Strict {
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var (
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b = append(data, '\r', '\n')
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r = bufio.NewReader(bytes.NewReader(b))
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)
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if response, err := http.ReadResponse(r, nil); err == nil {
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return &Protocol{
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Name: ProtocolHTTP,
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Version: Version{
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Major: response.ProtoMajor,
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Minor: response.ProtoMinor,
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Patch: -1,
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},
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}, confidence + .85
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}
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return nil, 0
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}
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var version = Version{Patch: -1}
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_, _ = fmt.Sscanf(string(data), "HTTP/%d.%d ", &version.Major, &version.Minor)
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return &Protocol{
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Name: ProtocolHTTP,
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Version: version,
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}, confidence + .75
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}
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