proc: inhibit chunked transfer encoding on existing TEs or known length

When a backend CGI, Lua or ucode handler produces a response which either
includes a Content-Length or a Transfer-Encoding header then disable the
uhttpd side chunked transfer encoding and assume the backend response to
be already properly encoded or length delimitted.

Fixes: https://github.com/openwrt/luci/issues/7655
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 4 insertions, 0 deletions

diff --git a/proc.c b/proc.c
index 2b69703..89fe320 100644
--- a/proc.c
+++ b/proc.c
@@ -218,6 +218,10 @@ static void proc_handle_header(struct relay *r, const char *name, const char *va
 		cl->dispatch.proc.status_code = atoi(buf);
 		return;
 	}
+	else if (!strcasecmp(name, "Content-Length") ||
+	         !strcasecmp(name, "Transfer-Encoding")) {
+		cl->request.disable_chunked = true;
+	}
 
 	blobmsg_add_string(&cl->dispatch.proc.hdr, name, val);
 }