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/*
This file is part of TALER
Copyright (C) 2014--2020 Taler Systems SA
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU Affero General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License along with
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file mhd_parsing.c
* @brief functions to parse incoming requests (MHD arguments and JSON snippets)
* @author Florian Dold
* @author Benedikt Mueller
* @author Christian Grothoff
*/
#include "platform.h"
#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_json_lib.h>
#include "taler_json_lib.h"
#include "taler_mhd_lib.h"
enum GNUNET_GenericReturnValue
TALER_MHD_parse_post_json (struct MHD_Connection *connection,
void **con_cls,
const char *upload_data,
size_t *upload_data_size,
json_t **json)
{
enum GNUNET_JSON_PostResult pr;
pr = GNUNET_JSON_post_parser (TALER_MHD_REQUEST_BUFFER_MAX,
connection,
con_cls,
upload_data,
upload_data_size,
json);
switch (pr)
{
case GNUNET_JSON_PR_OUT_OF_MEMORY:
GNUNET_break (NULL == *json);
return (MHD_NO ==
TALER_MHD_reply_with_error (
connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_GENERIC_PARSER_OUT_OF_MEMORY,
NULL)) ? GNUNET_SYSERR : GNUNET_NO;
case GNUNET_JSON_PR_CONTINUE:
GNUNET_break (NULL == *json);
return GNUNET_YES;
case GNUNET_JSON_PR_REQUEST_TOO_LARGE:
GNUNET_break (NULL == *json);
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Closing connection, upload too large\n");
return GNUNET_SYSERR;
case GNUNET_JSON_PR_JSON_INVALID:
GNUNET_break (NULL == *json);
return (MHD_YES ==
TALER_MHD_reply_with_error (connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_GENERIC_JSON_INVALID,
NULL))
? GNUNET_NO : GNUNET_SYSERR;
case GNUNET_JSON_PR_SUCCESS:
GNUNET_break (NULL != *json);
return GNUNET_YES;
}
/* this should never happen */
GNUNET_break (0);
return GNUNET_SYSERR;
}
void
TALER_MHD_parse_post_cleanup_callback (void *con_cls)
{
GNUNET_JSON_post_parser_cleanup (con_cls);
}
/**
* Extract fixed-size base32crockford encoded data from request.
*
* Queues an error response to the connection if the parameter is missing or
* invalid.
*
* @param connection the MHD connection
* @param param_name the name of the HTTP key with the value
* @param kind whether to extract from header, argument or footer
* @param[out] out_data pointer to store the result
* @param out_size expected size of @a out_data
* @param[out] present set to true if argument was found
* @return
* #GNUNET_YES if the the argument is present
* #GNUNET_NO if the argument is absent or malformed
* #GNUNET_SYSERR on internal error (error response could not be sent)
*/
static enum GNUNET_GenericReturnValue
parse_request_data (struct MHD_Connection *connection,
const char *param_name,
enum MHD_ValueKind kind,
void *out_data,
size_t out_size,
bool *present)
{
const char *str;
str = MHD_lookup_connection_value (connection,
kind,
param_name);
if (NULL == str)
{
*present = false;
return GNUNET_OK;
}
if (GNUNET_OK !=
GNUNET_STRINGS_string_to_data (str,
strlen (str),
out_data,
out_size))
return (MHD_NO ==
TALER_MHD_reply_with_error (connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_GENERIC_PARAMETER_MALFORMED,
param_name))
? GNUNET_SYSERR : GNUNET_NO;
*present = true;
return GNUNET_OK;
}
enum GNUNET_GenericReturnValue
TALER_MHD_parse_request_arg_data (struct MHD_Connection *connection,
const char *param_name,
void *out_data,
size_t out_size,
bool *present)
{
return parse_request_data (connection,
param_name,
MHD_GET_ARGUMENT_KIND,
out_data,
out_size,
present);
}
enum GNUNET_GenericReturnValue
TALER_MHD_parse_request_header_data (struct MHD_Connection *connection,
const char *header_name,
void *out_data,
size_t out_size,
bool *present)
{
return parse_request_data (connection,
header_name,
MHD_HEADER_KIND,
out_data,
out_size,
present);
}
enum GNUNET_GenericReturnValue
TALER_MHD_parse_request_arg_timeout (struct MHD_Connection *connection,
struct GNUNET_TIME_Absolute *expiration)
{
const char *ts;
char dummy;
unsigned long long tms;
ts = MHD_lookup_connection_value (connection,
MHD_GET_ARGUMENT_KIND,
"timeout_ms");
if (NULL == ts)
{
*expiration = GNUNET_TIME_UNIT_ZERO_ABS;
return GNUNET_OK;
}
if (1 !=
sscanf (ts,
"%llu%c",
&tms,
&dummy))
{
MHD_RESULT mret;
GNUNET_break_op (0);
mret = TALER_MHD_reply_with_error (connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_GENERIC_PARAMETER_MALFORMED,
"timeout_ms");
return (MHD_YES == mret)
? GNUNET_NO
: GNUNET_SYSERR;
}
*expiration = GNUNET_TIME_relative_to_absolute (
GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
tms));
return GNUNET_OK;
}
enum GNUNET_GenericReturnValue
TALER_MHD_parse_request_arg_number (struct MHD_Connection *connection,
const char *name,
uint64_t *off)
{
const char *ts;
char dummy;
unsigned long long num;
ts = MHD_lookup_connection_value (connection,
MHD_GET_ARGUMENT_KIND,
name);
if (NULL == ts)
return GNUNET_OK;
if (1 !=
sscanf (ts,
"%llu%c",
&num,
&dummy))
{
MHD_RESULT mret;
GNUNET_break_op (0);
mret = TALER_MHD_reply_with_error (connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_GENERIC_PARAMETER_MALFORMED,
name);
return (MHD_YES == mret)
? GNUNET_NO
: GNUNET_SYSERR;
}
*off = (uint64_t) num;
return GNUNET_OK;
}
enum GNUNET_GenericReturnValue
TALER_MHD_parse_json_data (struct MHD_Connection *connection,
const json_t *root,
struct GNUNET_JSON_Specification *spec)
{
enum GNUNET_GenericReturnValue ret;
const char *error_json_name;
unsigned int error_line;
ret = GNUNET_JSON_parse (root,
spec,
&error_json_name,
&error_line);
if (GNUNET_SYSERR == ret)
{
if (NULL == error_json_name)
error_json_name = "<no field>";
ret = (MHD_YES ==
TALER_MHD_REPLY_JSON_PACK (
connection,
MHD_HTTP_BAD_REQUEST,
GNUNET_JSON_pack_string ("hint",
TALER_ErrorCode_get_hint (
TALER_EC_GENERIC_JSON_INVALID)),
GNUNET_JSON_pack_uint64 ("code",
TALER_EC_GENERIC_JSON_INVALID),
GNUNET_JSON_pack_string ("field",
error_json_name),
GNUNET_JSON_pack_uint64 ("line",
error_line)))
? GNUNET_NO : GNUNET_SYSERR;
return ret;
}
return GNUNET_YES;
}
enum GNUNET_GenericReturnValue
TALER_MHD_parse_internal_json_data (struct MHD_Connection *connection,
const json_t *root,
struct GNUNET_JSON_Specification *spec)
{
enum GNUNET_GenericReturnValue ret;
const char *error_json_name;
unsigned int error_line;
ret = GNUNET_JSON_parse (root,
spec,
&error_json_name,
&error_line);
if (GNUNET_SYSERR == ret)
{
if (NULL == error_json_name)
error_json_name = "<no field>";
ret = (MHD_YES ==
TALER_MHD_REPLY_JSON_PACK (
connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
GNUNET_JSON_pack_string ("hint",
TALER_ErrorCode_get_hint (
TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE)),
GNUNET_JSON_pack_uint64 ("code",
TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE),
GNUNET_JSON_pack_string ("field",
error_json_name),
GNUNET_JSON_pack_uint64 ("line",
error_line)))
? GNUNET_NO : GNUNET_SYSERR;
return ret;
}
return GNUNET_YES;
}
enum GNUNET_GenericReturnValue
TALER_MHD_parse_json_array (struct MHD_Connection *connection,
const json_t *root,
struct GNUNET_JSON_Specification *spec,
...)
{
enum GNUNET_GenericReturnValue ret;
const char *error_json_name;
unsigned int error_line;
va_list ap;
json_int_t dim;
va_start (ap, spec);
dim = 0;
while ( (-1 != (ret = va_arg (ap, int))) &&
(NULL != root) )
{
dim++;
root = json_array_get (root, ret);
}
va_end (ap);
if (NULL == root)
{
ret = (MHD_YES ==
TALER_MHD_REPLY_JSON_PACK (
connection,
MHD_HTTP_BAD_REQUEST,
GNUNET_JSON_pack_string ("hint",
TALER_ErrorCode_get_hint (
TALER_EC_GENERIC_JSON_INVALID)),
GNUNET_JSON_pack_uint64 ("code",
TALER_EC_GENERIC_JSON_INVALID),
GNUNET_JSON_pack_string ("detail",
"expected array"),
GNUNET_JSON_pack_uint64 ("dimension",
dim)))
? GNUNET_NO : GNUNET_SYSERR;
return ret;
}
ret = GNUNET_JSON_parse (root,
spec,
&error_json_name,
&error_line);
if (GNUNET_SYSERR == ret)
{
if (NULL == error_json_name)
error_json_name = "<no field>";
ret = (MHD_YES ==
TALER_MHD_REPLY_JSON_PACK (
connection,
MHD_HTTP_BAD_REQUEST,
GNUNET_JSON_pack_string ("detail",
error_json_name),
GNUNET_JSON_pack_string ("hint",
TALER_ErrorCode_get_hint (
TALER_EC_GENERIC_JSON_INVALID)),
GNUNET_JSON_pack_uint64 ("code",
TALER_EC_GENERIC_JSON_INVALID),
GNUNET_JSON_pack_uint64 ("line",
error_line)))
? GNUNET_NO : GNUNET_SYSERR;
return ret;
}
return GNUNET_YES;
}
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 0
/* wallet currently doesn't always send content-length! */
GNUNET_break_op (0);
return (MHD_YES ==
TALER_MHD_reply_with_error (connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_GENERIC_PARAMETER_MISSING,
MHD_HTTP_HEADER_CONTENT_LENGTH))
? GNUNET_NO
: GNUNET_SYSERR;
#endif
}
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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