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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| package ebpfcommon | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "unsafe" | ||
|
|
||
| trace2 "go.opentelemetry.io/otel/trace" | ||
|
|
||
| "github.com/grafana/beyla/pkg/internal/request" | ||
| ) | ||
|
|
||
| const fastCGIRequestHeaderLen = 24 | ||
| const requestMethodKey = "REQUEST_METHOD" | ||
| const requestURIKey = "REQUEST_URI" | ||
| const scriptNameKey = "SCRIPT_NAME" | ||
| const responseError = 7 // FCGI_STDERR | ||
|
|
||
| func parseCGITable(b []byte) map[string]string { | ||
| res := map[string]string{} | ||
|
|
||
| for { | ||
| key := "" | ||
| val := "" | ||
| if len(b) <= 2 { // key len + val len | ||
| break | ||
| } | ||
|
|
||
| keyLen := int(b[0]) | ||
| valLen := int(b[1]) | ||
|
|
||
| if keyLen < 0 || valLen < 0 { | ||
| break | ||
| } | ||
|
|
||
| b = b[2:] | ||
|
|
||
| if keyLen > 0 && len(b) > keyLen { | ||
| key = string(b[:keyLen]) | ||
| b = b[keyLen:] | ||
| } | ||
|
|
||
| if valLen > 0 && len(b) > valLen { | ||
| val = string(b[:valLen]) | ||
| b = b[valLen:] | ||
| } | ||
|
|
||
| if key != "" { | ||
| res[key] = val | ||
| } | ||
| } | ||
|
|
||
| return res | ||
| } | ||
|
|
||
| func maybeFastCGI(b []byte) bool { | ||
| if len(b) <= fastCGIRequestHeaderLen { | ||
| return false | ||
| } | ||
|
|
||
| methodPos := bytes.Index(b, []byte(requestMethodKey)) | ||
|
|
||
| return methodPos >= 0 | ||
| } | ||
|
|
||
| func detectFastCGI(b, rb []byte) (string, string, int) { | ||
| b = b[fastCGIRequestHeaderLen:] | ||
|
|
||
| methodPos := bytes.Index(b, []byte(requestMethodKey)) | ||
| if methodPos >= 0 { | ||
| kv := parseCGITable(b) | ||
|
|
||
| method, ok := kv[requestMethodKey] | ||
| if !ok { | ||
| return "", "", -1 | ||
| } | ||
| uri, ok := kv[requestURIKey] | ||
| if !ok { | ||
| uri = kv[scriptNameKey] | ||
| } | ||
|
|
||
| // Translate the status code into HTTP, 200 OK, 500 ERR | ||
| status := 200 | ||
|
|
||
| if len(rb) >= 2 { | ||
| if rb[1] == responseError { | ||
| status = 500 | ||
| } | ||
| } | ||
|
|
||
| return method, uri, status | ||
| } | ||
| return "", "", -1 | ||
| } | ||
|
|
||
| func TCPToFastCGIToSpan(trace *TCPRequestInfo, op, uri string, status int) request.Span { | ||
| peer := "" | ||
| hostname := "" | ||
| hostPort := 0 | ||
|
|
||
| if trace.ConnInfo.S_port != 0 || trace.ConnInfo.D_port != 0 { | ||
| peer, hostname = (*BPFConnInfo)(unsafe.Pointer(&trace.ConnInfo)).reqHostInfo() | ||
| hostPort = int(trace.ConnInfo.D_port) | ||
| } | ||
|
|
||
| reqType := request.EventTypeHTTPClient | ||
| if trace.Direction == 0 { | ||
| reqType = request.EventTypeHTTP | ||
| } | ||
|
|
||
| return request.Span{ | ||
| Type: reqType, | ||
| Method: op, | ||
| Path: uri, | ||
| Peer: peer, | ||
| PeerPort: int(trace.ConnInfo.S_port), | ||
| Host: hostname, | ||
| HostPort: hostPort, | ||
| ContentLength: int64(trace.Len), | ||
| RequestStart: int64(trace.StartMonotimeNs), | ||
| Start: int64(trace.StartMonotimeNs), | ||
| End: int64(trace.EndMonotimeNs), | ||
| Status: status, | ||
| TraceID: trace2.TraceID(trace.Tp.TraceId), | ||
| SpanID: trace2.SpanID(trace.Tp.SpanId), | ||
| ParentSpanID: trace2.SpanID(trace.Tp.ParentId), | ||
| Flags: trace.Tp.Flags, | ||
| Pid: request.PidInfo{ | ||
| HostPID: trace.Pid.HostPid, | ||
| UserPID: trace.Pid.UserPid, | ||
| Namespace: trace.Pid.Ns, | ||
| }, | ||
| } | ||
| } |
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