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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

* order imports

* use strconv.ParseUint instead of strconv.ParseInt

Co-authored-by: Kévin Dunglas <kevin@dunglas.fr>

---------

Co-authored-by: Kévin Dunglas <kevin@dunglas.fr>
This commit is contained in:
WeidiDeng 2024-12-18 08:22:12 +08:00 committed by GitHub
parent c864b82ae1
commit 6790c0e38a
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1 changed files with 11 additions and 0 deletions
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11
modules/caddyhttp/reverseproxy/fastcgi/client.go
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@ -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.
@ -136,6 +138,15 @@ 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 if _, err := strconv.ParseUint(clStr, 10, 64); err != nil {
// 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
return nil, caddyhttp.Error(http.StatusLengthRequired, err)
}
writer := &streamWriter{c: c}
writer.buf = bufPool.Get().(*bytes.Buffer)
writer.buf.Reset()