From 1f9427e1d9672b93577aea4c9d5a63575ee0b525 Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Sat, 6 May 2023 19:43:17 +0200
Subject: add convenience function for content-length limiation

---
 src/mhd/mhd_parsing.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

(limited to 'src/mhd')

diff --git a/src/mhd/mhd_parsing.c b/src/mhd/mhd_parsing.c
index e76450831..b047df7d3 100644
--- a/src/mhd/mhd_parsing.c
+++ b/src/mhd/mhd_parsing.c
@@ -350,4 +350,46 @@ TALER_MHD_parse_json_array (struct MHD_Connection *connection,
 }
 
 
+enum GNUNET_GenericReturnValue
+TALER_MHD_check_content_length_ (struct MHD_Connection *connection,
+                                 unsigned long long max_len)
+{
+  const char *cl;
+  unsigned long long cv;
+  char dummy;
+
+  /* Maybe check for maximum upload size
+       and refuse requests if they are just too big. */
+  cl = MHD_lookup_connection_value (connection,
+                                    MHD_HEADER_KIND,
+                                    MHD_HTTP_HEADER_CONTENT_LENGTH);
+  if (NULL == cl)
+    return GNUNET_OK;
+  if (1 != sscanf (cl,
+                   "%llu%c",
+                   &cv,
+                   &dummy))
+  {
+    /* Not valid HTTP request, just close connection. */
+    GNUNET_break_op (0);
+    return (MHD_YES ==
+            TALER_MHD_reply_with_error (connection,
+                                        MHD_HTTP_BAD_REQUEST,
+                                        TALER_EC_GENERIC_PARAMETER_MALFORMED,
+                                        MHD_HTTP_HEADER_CONTENT_LENGTH))
+      ? GNUNET_NO
+      : GNUNET_SYSERR;
+  }
+  if (cv > TALER_MHD_REQUEST_BUFFER_MAX)
+  {
+    GNUNET_break_op (0);
+    return (MHD_YES ==
+            TALER_MHD_reply_request_too_large (connection))
+    ? GNUNET_NO
+    : GNUNET_SYSERR;
+  }
+  return GNUNET_OK;
+}
+
+
 /* end of mhd_parsing.c */
-- 
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