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fastcgi: check for CONTENT_LENGTH when sending requests #6661

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Merged
mholt merged 4 commits into from
Dec 18, 2024
Merged

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
f0801b9
use strconv.ParseUint instead of strconv.ParseInt
WeidiDeng Dec 18, 2024
a55962a
Merge branch 'master' into fastcgi-cl-header
mholt Dec 18, 2024
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11 changes: 11 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 +138,15 @@ 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()
Expand Down