base.h

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#pragma once
/*
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
/** Main include file for our libcurl extension API
 *
 * @file src/lib/curl/base.h
 *
 * @copyright 2019 The FreeRADIUS project
 * @copyright 2019 Arran Cudbard-Bell (a.cudbardb@freeradius.org)
 */
 
RCSIDH(curl_h, "$Id: 53d43a08a543e425ddbcd9fa28b319b88a1b01c8 $")
 
#ifdef __cplusplus
extern "C" {
#endif
 
#define CURL_NO_OLDIES 1
 
#include <curl/curl.h>
#include <freeradius-devel/server/global_lib.h>
#include <freeradius-devel/server/module.h>
#include <freeradius-devel/server/request.h>
#include <freeradius-devel/util/event.h>
#include <freeradius-devel/util/slab.h>
#include <freeradius-devel/unlang/xlat.h>
 
DIAG_OFF_OPTIONAL(disabled-macro-expansion)
#define FR_CURL_SET_OPTION(_x, _y)\
do {\
        CURLcode _ret;\
        if ((_ret = curl_easy_setopt(randle->candle, _x, _y)) != CURLE_OK) {\
                char const *_option;\
                _option = STRINGIFY(_x);\
                ERROR("Failed setting curl option %s: %s (%u)", _option, curl_easy_strerror(_ret), _ret);\
                goto error;\
        }\
} while (0)
 
#define FR_CURL_ROPTIONAL_SET_OPTION(_x, _y)\
do {\
        CURLcode _ret;\
        if ((_ret = curl_easy_setopt(randle->candle, _x, _y)) != CURLE_OK) {\
                char const *_option;\
                _option = STRINGIFY(_x);\
                ROPTIONAL(RERROR, ERROR, "Failed setting curl option %s: %s (%u)", _option, curl_easy_strerror(_ret), _ret);\
                goto error;\
        }\
} while (0)
 
#define FR_CURL_REQUEST_SET_OPTION(_x, _y)\
do {\
        CURLcode _ret;\
        if ((_ret = curl_easy_setopt(randle->candle, _x, _y)) != CURLE_OK) {\
                char const *_option;\
                _option = STRINGIFY(_x);\
                RERROR("Failed setting curl option %s: %s (%u)", _option, curl_easy_strerror(_ret), _ret);\
                goto error;\
        }\
} while (0)
 
/*
 * We have to use this as curl uses lots of enums
 */
#ifndef CURL_AT_LEAST_VERSION
#  define CURL_VERSION_BITS(x, y, z) ((x) << 16 | (y) << 8 | (z))
#  define CURL_AT_LEAST_VERSION(x, y, z) (LIBCURL_VERSION_NUM >= CURL_VERSION_BITS(x, y, z))
#endif
 
/** Uctx data for timer and I/O functions
 *
 * Seems like overkill for a single field, but I'm sure we'll need to
 * pass around other things later.
 */
typedef struct {
        fr_event_list_t         *el;                    //!< Event list servicing I/O events.
        fr_timer_t              *ev;                    //!< Multi-Handle timer.
        uint64_t                transfers;              //!< How many transfers are current in progress.
        CURLM                   *mandle;                //!< The multi handle.
} fr_curl_handle_t;
 
/** Structure representing an individual request being passed to curl for processing
 *
 */
typedef struct {
        CURL                    *candle;                //!< Request specific handle.
        CURLcode                result;                 //!< Result of executing the request.
        request_t               *request;               //!< Current request.
        void                    *uctx;                  //!< Private data for the module using the API.
} fr_curl_io_request_t;
 
typedef struct {
        char const              *certificate_file;
        char const              *private_key_file;
        char const              *private_key_password;
        char const              *ca_file;
        char const              *ca_issuer_file;
        char const              *ca_path;
        char const              *random_file;
        curl_usessl             require_cert;
        bool                    check_cert;
        bool                    check_cert_cn;
        bool                    extract_cert_attrs;
        char const              *keylog_file;           //!< Where to log SSL keying material like the pre-master secret.
                                                        ///< The log file can then be used to decrypt the SSL session
                                                        ///< with Wireshark.
} fr_curl_tls_t;
 
typedef struct {
        fr_slab_config_t        reuse;
        fr_time_delta_t         connect_timeout;
} fr_curl_conn_config_t;
 
extern conf_parser_t            fr_curl_tls_config[];
extern conf_parser_t            fr_curl_conn_config[];
extern global_lib_autoinst_t    fr_curl_autoinst;
 
int                     fr_curl_io_request_enqueue(fr_curl_handle_t *mhandle,
                                                   request_t *request, fr_curl_io_request_t *creq);
 
fr_curl_io_request_t    *fr_curl_io_request_alloc(TALLOC_CTX *ctx);
 
fr_curl_handle_t        *fr_curl_io_init(TALLOC_CTX *ctx, fr_event_list_t *el, bool multiplex);
 
int                     fr_curl_response_certinfo(request_t *request, fr_curl_io_request_t *randle);
 
int                     fr_curl_easy_tls_init (fr_curl_io_request_t *randle, fr_curl_tls_t const *conf);
 
CURL                    *fr_curl_tmp_handle(void);
#ifdef __cplusplus
}
#endif