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fastcgi: check for CONTENT_LENGTH when sending requests #6661

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fastcgi: check for CONTENT_LENGTH when sending requests #6661

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78265c6
fastcgi: check for CONTENT_LENGTH when sending requests
WeidiDeng Oct 24, 2024
6db43b6
order imports
WeidiDeng Oct 24, 2024
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14 changes: 14 additions & 0 deletions modules/caddyhttp/reverseproxy/fastcgi/client.go
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,8 @@ import (

"go.uber.org/zap"
"go.uber.org/zap/zapcore"

"github.com/caddyserver/caddy/v2/modules/caddyhttp"
)

// FCGIListenSockFileno describes listen socket file number.
Expand Down Expand Up @@ -136,6 +138,18 @@ type client struct {
// Do made the request and returns a io.Reader that translates the data read
// from fcgi responder out of fcgi packet before returning it.
func (c *client) Do(p map[string]string, req io.Reader) (r io.Reader, err error) {
// check for CONTENT_LENGTH, since the lack of it or wrong value will cause the backend to hang
if clStr, ok := p["CONTENT_LENGTH"]; !ok {
return nil, caddyhttp.Error(http.StatusLengthRequired, nil)
} else {
cl, err := strconv.ParseInt(clStr, 10, 64)
// stdlib won't return a negative Content-Length, but we check just in case,
// the most likely cause is from a missing content length, which is -1
if err != nil || cl < 0 {
return nil, caddyhttp.Error(http.StatusLengthRequired, err)
}
}

writer := &streamWriter{c: c}
writer.buf = bufPool.Get().(*bytes.Buffer)
writer.buf.Reset()
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