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/*
This file is part of libmicrohttpd
Copyright (C) 2007-2018 Daniel Pittman and Christian Grothoff
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file requests.c
* @brief Methods for managing HTTP requests
* @author Daniel Pittman
* @author Christian Grothoff
* @author Karlson2k (Evgeny Grin)
*/
#include "internal.h"
/**
* Get all of the headers from the request.
*
* @param request request to get values from
* @param kind types of values to iterate over, can be a bitmask
* @param iterator callback to call on each header;
* maybe NULL (then just count headers)
* @param iterator_cls extra argument to @a iterator
* @return number of entries iterated over
* @ingroup request
*/
unsigned int
MHD_request_get_values (struct MHD_Request *request,
enum MHD_ValueKind kind,
MHD_KeyValueIterator iterator,
void *iterator_cls)
{
int ret;
struct MHD_HTTP_Header *pos;
ret = 0;
for (pos = request->headers_received;
NULL != pos;
pos = pos->next)
{
if (0 != (pos->kind & kind))
{
ret++;
if ( (NULL != iterator) &&
(MHD_YES != iterator (iterator_cls,
pos->kind,
pos->header,
pos->value)) )
return ret;
}
}
return ret;
}
/**
* This function can be used to add an entry to the HTTP headers of a
* request (so that the #MHD_request_get_values function will
* return them -- and the `struct MHD_PostProcessor` will also see
* them). This maybe required in certain situations (see Mantis
* #1399) where (broken) HTTP implementations fail to supply values
* needed by the post processor (or other parts of the application).
*
* This function MUST only be called from within the
* request callbacks (otherwise, access maybe improperly
* synchronized). Furthermore, the client must guarantee that the key
* and value arguments are 0-terminated strings that are NOT freed
* until the connection is closed. (The easiest way to do this is by
* passing only arguments to permanently allocated strings.).
*
* @param request the request for which a
* value should be set
* @param kind kind of the value
* @param key key for the value
* @param value the value itself
* @return #MHD_NO if the operation could not be
* performed due to insufficient memory;
* #MHD_YES on success
* @ingroup request
*/
enum MHD_Bool
MHD_request_set_value (struct MHD_Request *request,
enum MHD_ValueKind kind,
const char *key,
const char *value)
{
struct MHD_HTTP_Header *pos;
pos = MHD_pool_allocate (request->connection->pool,
sizeof (struct MHD_HTTP_Header),
MHD_YES);
if (NULL == pos)
return MHD_NO;
pos->header = (char *) key;
pos->value = (char *) value;
pos->kind = kind;
pos->next = NULL;
/* append 'pos' to the linked list of headers */
if (NULL == request->headers_received_tail)
{
request->headers_received = pos;
request->headers_received_tail = pos;
}
else
{
request->headers_received_tail->next = pos;
request->headers_received_tail = pos;
}
return MHD_YES;
}
/**
* Get a particular header value. If multiple
* values match the kind, return any one of them.
*
* @param request request to get values from
* @param kind what kind of value are we looking for
* @param key the header to look for, NULL to lookup 'trailing' value without a key
* @return NULL if no such item was found
* @ingroup request
*/
const char *
MHD_request_lookup_value (struct MHD_Request *request,
enum MHD_ValueKind kind,
const char *key)
{
struct MHD_HTTP_Header *pos;
for (pos = request->headers_received;
NULL != pos;
pos = pos->next)
{
if ((0 != (pos->kind & kind)) &&
( (key == pos->header) ||
( (NULL != pos->header) &&
(NULL != key) &&
(MHD_str_equal_caseless_ (key,
pos->header)))))
return pos->value;
}
return NULL;
}
/* end of request.c */
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