Send HTTP headers to payload callback

Even if libweb already parses some common headers, such as
Content-Length, some users might find it interesting to inspect which
headers were received from a request.

Since HTTP/1.1 does not define a limit on the number of maximum headers
a client can send, for security reasons a maximum value must be provided
by the user. Any extra headers shall be then discarded by libweb.

An example application showing this new feature is also provided.

2 files changed, 10 insertions, 5 deletions

diff --git a/include/libweb/handler.h b/include/libweb/handler.h
index 9cde129..f7bc76a 100644
--- a/include/libweb/handler.h
+++ b/include/libweb/handler.h
@@ -13,6 +13,7 @@ struct handler_cfg
     int (*length)(unsigned long long len, const struct http_cookie *c,
         struct http_response *r, void *user);
     void *user;
+    size_t max_headers;
 };
 
 struct handler *handler_alloc(const struct handler_cfg *cfg);
diff --git a/include/libweb/http.h b/include/libweb/http.h
index 80030fb..ddb6a89 100644
--- a/include/libweb/http.h
+++ b/include/libweb/http.h
@@ -5,6 +5,11 @@
 #include <stddef.h>
 #include <stdio.h>
 
+struct http_header
+{
+    char *header, *value;
+};
+
 struct http_payload
 {
     enum http_op
@@ -46,7 +51,8 @@ struct http_payload
         char *key, *value;
     } *args;
 
-    size_t n_args;
+    size_t n_args, n_headers;
+    const struct http_header *headers;
 };
 
 #define HTTP_STATUSES \
@@ -69,10 +75,7 @@ struct http_response
 #undef X
     } status;
 
-    struct http_header
-    {
-        char *header, *value;
-    } *headers;
+    struct http_header *headers;
 
     union
     {
@@ -96,6 +99,7 @@ struct http_cfg
         struct http_response *r, void *user);
     const char *tmpdir;
     void *user;
+    size_t max_headers;
 };
 
 struct http_ctx *http_alloc(const struct http_cfg *cfg);