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Diffstat (limited to 'src/lib/auditor_api_handle.c')
| -rw-r--r-- | src/lib/auditor_api_handle.c | 449 |
1 files changed, 0 insertions, 449 deletions
diff --git a/src/lib/auditor_api_handle.c b/src/lib/auditor_api_handle.c deleted file mode 100644 index 9edb1115e..000000000 --- a/src/lib/auditor_api_handle.c +++ /dev/null @@ -1,449 +0,0 @@ -/* - This file is part of TALER - Copyright (C) 2014-2022 Taler Systems SA - - TALER 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 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 General Public License for more details. - - You should have received a copy of the GNU General Public License along with - TALER; see the file COPYING. If not, see - <http://www.gnu.org/licenses/> -*/ -/** - * @file lib/auditor_api_handle.c - * @brief Implementation of the "handle" component of the auditor's HTTP API - * @author Sree Harsha Totakura <sreeharsha@totakura.in> - * @author Christian Grothoff - */ -#include "platform.h" -#include <microhttpd.h> -#include <gnunet/gnunet_curl_lib.h> -#include "taler_json_lib.h" -#include "taler_auditor_service.h" -#include "taler_signatures.h" -#include "auditor_api_handle.h" -#include "auditor_api_curl_defaults.h" -#include "backoff.h" - -/** - * Which revision of the Taler auditor protocol is implemented - * by this library? Used to determine compatibility. - */ -#define TALER_PROTOCOL_CURRENT 0 - -/** - * How many revisions back are we compatible to? - */ -#define TALER_PROTOCOL_AGE 0 - - -/** - * Log error related to CURL operations. - * - * @param type log level - * @param function which function failed to run - * @param code what was the curl error code - */ -#define CURL_STRERROR(type, function, code) \ - GNUNET_log (type, "Curl function `%s' has failed at `%s:%d' with error: %s", \ - function, __FILE__, __LINE__, curl_easy_strerror (code)); - -/** - * Stages of initialization for the `struct TALER_AUDITOR_Handle` - */ -enum AuditorHandleState -{ - /** - * Just allocated. - */ - MHS_INIT = 0, - - /** - * Obtained the auditor's versioning data and version. - */ - MHS_VERSION = 1, - - /** - * Failed to initialize (fatal). - */ - MHS_FAILED = 2 -}; - - -/** - * Handle to the auditor - */ -struct TALER_AUDITOR_Handle -{ - /** - * The context of this handle - */ - struct GNUNET_CURL_Context *ctx; - - /** - * The URL of the auditor (i.e. "http://auditor.taler.net/") - */ - char *url; - - /** - * Function to call with the auditor's certification data, - * NULL if this has already been done. - */ - TALER_AUDITOR_VersionCallback version_cb; - - /** - * Closure to pass to @e version_cb. - */ - void *version_cb_cls; - - /** - * Data for the request to get the /version of a auditor, - * NULL once we are past stage #MHS_INIT. - */ - struct GNUNET_CURL_Job *vr; - - /** - * The url for the @e vr job. - */ - char *vr_url; - - /** - * Task for retrying /version request. - */ - struct GNUNET_SCHEDULER_Task *retry_task; - - /** - * /version data of the auditor, only valid if - * @e handshake_complete is past stage #MHS_VERSION. - */ - char *version; - - /** - * Version information for the callback. - */ - struct TALER_AUDITOR_VersionInformation vi; - - /** - * Retry /version frequency. - */ - struct GNUNET_TIME_Relative retry_delay; - - /** - * Stage of the auditor's initialization routines. - */ - enum AuditorHandleState state; - -}; - - -/* ***************** Internal /version fetching ************* */ - -/** - * Decode the JSON in @a resp_obj from the /version response and store the data - * in the @a key_data. - * - * @param[in] resp_obj JSON object to parse - * @param[in,out] auditor where to store the results we decoded - * @param[out] vc where to store version compatibility data - * @return #TALER_EC_NONE on success - */ -static enum TALER_ErrorCode -decode_version_json (const json_t *resp_obj, - struct TALER_AUDITOR_Handle *auditor, - enum TALER_AUDITOR_VersionCompatibility *vc) -{ - struct TALER_AUDITOR_VersionInformation *vi = &auditor->vi; - unsigned int age; - unsigned int revision; - unsigned int current; - char dummy; - const char *ver; - struct GNUNET_JSON_Specification spec[] = { - GNUNET_JSON_spec_string ("version", - &ver), - GNUNET_JSON_spec_fixed_auto ("auditor_public_key", - &vi->auditor_pub), - GNUNET_JSON_spec_end () - }; - - if (JSON_OBJECT != json_typeof (resp_obj)) - { - GNUNET_break_op (0); - return TALER_EC_GENERIC_JSON_INVALID; - } - /* check the version */ - if (GNUNET_OK != - GNUNET_JSON_parse (resp_obj, - spec, - NULL, NULL)) - { - GNUNET_break_op (0); - return TALER_EC_GENERIC_JSON_INVALID; - } - if (3 != sscanf (ver, - "%u:%u:%u%c", - ¤t, - &revision, - &age, - &dummy)) - { - GNUNET_break_op (0); - return TALER_EC_GENERIC_VERSION_MALFORMED; - } - GNUNET_free (auditor->version); - auditor->version = GNUNET_strdup (ver); - vi->version = auditor->version; - *vc = TALER_AUDITOR_VC_MATCH; - if (TALER_PROTOCOL_CURRENT < current) - { - *vc |= TALER_AUDITOR_VC_NEWER; - if (TALER_PROTOCOL_CURRENT < current - age) - *vc |= TALER_AUDITOR_VC_INCOMPATIBLE; - } - if (TALER_PROTOCOL_CURRENT > current) - { - *vc |= TALER_AUDITOR_VC_OLDER; - if (TALER_PROTOCOL_CURRENT - TALER_PROTOCOL_AGE > current) - *vc |= TALER_AUDITOR_VC_INCOMPATIBLE; - } - return TALER_EC_NONE; -} - - -/** - * Initiate download of /version from the auditor. - * - * @param cls auditor where to download /version from - */ -static void -request_version (void *cls); - - -/** - * Callback used when downloading the reply to a /version request - * is complete. - * - * @param cls the `struct TALER_AUDITOR_Handle` - * @param response_code HTTP response code, 0 on error - * @param gresp_obj parsed JSON result, NULL on error, must be a `const json_t *` - */ -static void -version_completed_cb (void *cls, - long response_code, - const void *gresp_obj) -{ - struct TALER_AUDITOR_Handle *auditor = cls; - const json_t *resp_obj = gresp_obj; - enum TALER_AUDITOR_VersionCompatibility vc; - struct TALER_AUDITOR_HttpResponse hr = { - .reply = resp_obj, - .http_status = (unsigned int) response_code - }; - - auditor->vr = NULL; - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Received version from URL `%s' with status %ld.\n", - auditor->url, - response_code); - vc = TALER_AUDITOR_VC_PROTOCOL_ERROR; - switch (response_code) - { - case 0: - case MHD_HTTP_INTERNAL_SERVER_ERROR: - /* NOTE: this design is debatable. We MAY want to throw this error at the - client. We may then still additionally internally re-try. */ - GNUNET_assert (NULL == auditor->retry_task); - auditor->retry_delay = EXCHANGE_LIB_BACKOFF (auditor->retry_delay); - auditor->retry_task = GNUNET_SCHEDULER_add_delayed (auditor->retry_delay, - &request_version, - auditor); - return; - case MHD_HTTP_OK: - if (NULL == resp_obj) - { - GNUNET_break_op (0); - TALER_LOG_WARNING ("NULL body for a 200-OK /version\n"); - hr.http_status = 0; - hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE; - break; - } - hr.ec = decode_version_json (resp_obj, - auditor, - &vc); - if (TALER_EC_NONE != hr.ec) - { - GNUNET_break_op (0); - hr.http_status = 0; - break; - } - auditor->retry_delay = GNUNET_TIME_UNIT_ZERO; /* restart quickly */ - break; - default: - hr.ec = TALER_JSON_get_error_code (resp_obj); - hr.hint = TALER_JSON_get_error_hint (resp_obj); - GNUNET_log (GNUNET_ERROR_TYPE_ERROR, - "Unexpected response code %u/%d\n", - (unsigned int) response_code, - (int) hr.ec); - break; - } - if (MHD_HTTP_OK != response_code) - { - GNUNET_log (GNUNET_ERROR_TYPE_ERROR, - "/version failed for auditor %s: %u!\n", - auditor->url, - (unsigned int) response_code); - auditor->state = MHS_FAILED; - /* notify application that we failed */ - auditor->version_cb (auditor->version_cb_cls, - &hr, - NULL, - vc); - return; - } - TALER_LOG_DEBUG ("Switching auditor state to 'version'\n"); - auditor->state = MHS_VERSION; - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Auditor %s is now READY!\n", - auditor->url); - /* notify application about the key information */ - auditor->version_cb (auditor->version_cb_cls, - &hr, - &auditor->vi, - vc); -} - - -/** - * Initiate download of /version from the auditor. - * - * @param cls auditor where to download /version from - */ -static void -request_version (void *cls) -{ - struct TALER_AUDITOR_Handle *auditor = cls; - CURL *eh; - - auditor->retry_task = NULL; - GNUNET_assert (NULL == auditor->vr); - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Requesting auditor version with URL `%s'.\n", - auditor->vr_url); - eh = TALER_AUDITOR_curl_easy_get_ (auditor->vr_url); - if (NULL == eh) - { - GNUNET_break (0); - auditor->retry_delay = EXCHANGE_LIB_BACKOFF (auditor->retry_delay); - auditor->retry_task = GNUNET_SCHEDULER_add_delayed (auditor->retry_delay, - &request_version, - auditor); - return; - } - GNUNET_break (CURLE_OK == - curl_easy_setopt (eh, - CURLOPT_TIMEOUT, - (long) 300)); - auditor->vr = GNUNET_CURL_job_add (auditor->ctx, - eh, - &version_completed_cb, - auditor); -} - - -/* ********************* library internal API ********* */ - - -struct GNUNET_CURL_Context * -TALER_AUDITOR_handle_to_context_ (struct TALER_AUDITOR_Handle *h) -{ - return h->ctx; -} - - -enum GNUNET_GenericReturnValue -TALER_AUDITOR_handle_is_ready_ (struct TALER_AUDITOR_Handle *h) -{ - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Checking if auditor at `%s` is now ready: %s\n", - h->url, - (MHD_VERSION == h->state) ? "yes" : "no"); - return (MHS_VERSION == h->state) ? GNUNET_YES : GNUNET_NO; -} - - -char * -TALER_AUDITOR_path_to_url_ (struct TALER_AUDITOR_Handle *h, - const char *path) -{ - GNUNET_assert ('/' == path[0]); - return TALER_url_join (h->url, - path + 1, - NULL); -} - - -/* ********************* public API ******************* */ - - -struct TALER_AUDITOR_Handle * -TALER_AUDITOR_connect (struct GNUNET_CURL_Context *ctx, - const char *url, - TALER_AUDITOR_VersionCallback version_cb, - void *version_cb_cls) -{ - struct TALER_AUDITOR_Handle *auditor; - - auditor = GNUNET_new (struct TALER_AUDITOR_Handle); - auditor->version_cb = version_cb; - auditor->version_cb_cls = version_cb_cls; - auditor->retry_delay = GNUNET_TIME_UNIT_SECONDS; /* start slowly */ - auditor->ctx = ctx; - auditor->url = GNUNET_strdup (url); - auditor->vr_url = TALER_AUDITOR_path_to_url_ (auditor, - "/version"); - if (NULL == auditor->vr_url) - { - GNUNET_break (0); - GNUNET_free (auditor->url); - GNUNET_free (auditor); - return NULL; - } - auditor->retry_task = GNUNET_SCHEDULER_add_now (&request_version, - auditor); - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Connecting to auditor at URL `%s'.\n", - url); - return auditor; -} - - -void -TALER_AUDITOR_disconnect (struct TALER_AUDITOR_Handle *auditor) -{ - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Disconnecting from auditor at URL `%s'.\n", - auditor->url); - if (NULL != auditor->vr) - { - GNUNET_CURL_job_cancel (auditor->vr); - auditor->vr = NULL; - } - if (NULL != auditor->retry_task) - { - GNUNET_SCHEDULER_cancel (auditor->retry_task); - auditor->retry_task = NULL; - } - GNUNET_free (auditor->version); - GNUNET_free (auditor->vr_url); - GNUNET_free (auditor->url); - GNUNET_free (auditor); -} - - -/* end of auditor_api_handle.c */ |