sync/gen_statemachine.ysl2
author Volker Birk <vb@pep-project.org>
Fri, 15 Mar 2019 16:06:53 +0100
branchsync
changeset 3339 bd26d8c34462
parent 3338 e4906a775c0c
child 3340 4b4b1262b415
permissions -rw-r--r--
should be enough
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// This file is under GNU General Public License 3.0
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// see LICENSE.txt
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// generate state machine code
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// Copyleft (c) 2016 - 2018, p≡p foundation
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// Written by Volker Birk
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include yslt.yml2
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tstylesheet {
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    include standardlib.ysl2
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    include ./functions.ysl2
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    template "/protocol" {
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        document "generated/{@name}_event.h", "text"
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        ||
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        // This file is under GNU General Public License 3.0
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        // see LICENSE.txt
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        #pragma once
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        #include "dynamic_api.h"
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        #ifdef __cplusplus
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        extern "C" {
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        #endif
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        typedef struct «@name» «yml:ucase(@name)»;
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        typedef int «yml:ucase(@name)»_PR;
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        typedef struct «@name»_event {
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            «yml:ucase(@name)»_PR fsm;
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            int event;
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            «yml:ucase(@name)» *msg;
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        } «@name»_event_t;
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        // new_«@name»_event() - allocate a new «@name»_event
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        //
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        //  parameters:
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        //      fsm (in)        finite state machine the event is for
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        //      event (in)      event or None
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        //      msg (in)        message to compute event from
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        //
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        //  return value:
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        //      pointer to new event or NULL in case of failure
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        //
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        //  caveat:
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        //      event must be valid for fsm or None
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        //      in case msg is given event will be calculated out of message
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        «@name»_event_t *new_«@name»_event(«yml:ucase(@name)»_PR fsm, int event, «yml:ucase(@name)» *msg);
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        #define «yml:ucase(@name)»_TIMEOUT_EVENT new_«@name»_event(«@name»_PR_NOTHING, 0, NULL);
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vb@3338
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        // free_«@name»_event() - free memory occupied by event
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        //
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        //  parameters:
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        //      ev (in)         event to free
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        void free_«@name»_event(«@name»_event_t *ev);
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        #ifdef __cplusplus
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        }
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        #endif
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        ||
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        document "generated/{@name}_event.c", "text"
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        ||
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        // This file is under GNU General Public License 3.0
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        // see LICENSE.txt
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        #include "platform.h"
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        #include "pEp_internal.h"
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        #include "«@name»_event.h"
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        #include "«@name»_func.h"
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        `` for "fsm" | #include "«@name»_fsm.h"
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        «@name»_event_t *new_«@name»_event(«yml:ucase(@name)»_PR fsm, int event, «@name»_t *msg)
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        {
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            «@name»_event_t *ev = («@name»_event_t *) calloc(1, sizeof(«@name»_event_t));
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            assert(ev);
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            if (!ev)
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                return NULL;
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            ev->fsm = fsm;
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            ev->event = event;
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            ev->msg = msg;
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            if (msg) {
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                switch (fsm) {
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                    `` apply "fsm", 3, mode=event
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                    default:
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                        // unknown protocol
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                        free(ev);
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                        return NULL;
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                }
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            }
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            return ev;
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        }
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        void free_«@name»_event(«@name»_event_t *ev)
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        {
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            if (ev) {
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                free_«@name»_message(ev->msg);
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                free(ev);
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            }
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        }
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        ||
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        document "generated/{@name}_impl.h", "text" {
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            ||
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            // This file is under GNU General Public License 3.0
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            // see LICENSE.txt
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            #pragma once
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            #include "fsm_common.h"
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            #include "«@name»_event.h"
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            #include "message_api.h"
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            #include "../asn.1/«@name».h"
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            #define «yml:ucase(@name)»_THRESHOLD «@threshold»
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            `` for "fsm" | #define «yml:ucase(@name)»_THRESHOLD «@threshold»
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            #ifdef __cplusplus
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            extern "C" {
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            #endif
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            // conditions
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            ||
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            for "func:distinctName(*//condition)"
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                | PEP_STATUS «@name»(PEP_SESSION session, bool *result);
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            ||
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            // actions
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            ||
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            for "func:distinctName(*//action)"
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                | PEP_STATUS «@name»(PEP_SESSION session);
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            ||
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            // timeout handler
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            ||
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            for "fsm[@threshold > 0]"
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                | PEP_STATUS «@name»TimeoutHandler(PEP_SESSION session);
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            ||
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            // send message about an event to communication partners using state
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            PEP_STATUS send_«@name»_message(
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                    PEP_SESSION session, 
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                    «@name»_PR fsm,
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                    int message_type
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                );
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            // receive message and store it in state
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            PEP_STATUS recv_«@name»_event(
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                    PEP_SESSION session,
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                    «@name»_event_t *ev
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                );
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            // state machine driver
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            // if fsm or event set to 0 use fields in src if present
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            PEP_STATUS «@name»_driver(
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                    PEP_SESSION session,
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                    «@name»_PR fsm,
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                    int event
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                );
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            // API being used by the engine internally
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   184
vb@2888
   185
            // call this if you need to signal an external event
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   186
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   187
            PEP_STATUS signal_«@name»_event(
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   188
                    PEP_SESSION session, 
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   189
                    «@name»_PR fsm,
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                    int event
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                );
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            // call this if you are a transport and are receiving
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            // a «@name» message
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            PEP_STATUS signal_«@name»_message(
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                    PEP_SESSION session, 
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                    PEP_rating rating,
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                    const char *data,
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                    size_t size,
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                    const char *fpr
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                );
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            #ifdef __cplusplus
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            }
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            #endif
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            ||
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        }
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        document "generated/{@name}_impl.c", "text" {
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            ||
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            // This file is under GNU General Public License 3.0
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            // see LICENSE.txt
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            #include "«@name»_impl.h"
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            #include "pEp_internal.h"
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            #include "«@name»_event.h"
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            #include "«yml:lcase(@name)»_codec.h"
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            #include "baseprotocol.h"
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            `` for "fsm" | #include "«@name»_fsm.h"
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            `` apply "fsm", 0, mode=timeout
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            PEP_STATUS «@name»_driver(
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                    PEP_SESSION session,
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                    «@name»_PR fsm,
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                    int event
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                )
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            {
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                assert(session);
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                if (!session)
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                    return PEP_ILLEGAL_VALUE;
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                switch (fsm) {
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                    case None:
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                        if (!event) {
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                            // timeout occured
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                        `` for "fsm" |>>>> «../@name»_driver(session, «../@name»_PR_«yml:lcase(@name)», None);
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                            return PEP_STATUS_OK;
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                        }
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                        return PEP_ILLEGAL_VALUE;
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                    `` apply "fsm", mode=reset_state_machine;
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                    default:
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                        return PEP_ILLEGAL_VALUE;
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                }
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                int next_state = None;
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                do {
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                    switch (fsm) {
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                        `` apply "fsm", 3, mode=driver               
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                        default:
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                            return PEP_ILLEGAL_VALUE;
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                    }
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                }  while (next_state);
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   257
                return PEP_STATUS_OK;
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            }
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vb@2880
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            PEP_STATUS signal_«@name»_event(
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                    PEP_SESSION session, 
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                    «@name»_PR fsm,
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                    int event
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                )
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            {
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                «@name»_t *msg = NULL;
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                «@name»_event_t *ev = NULL;
vb@2870
   268
vb@2870
   269
                assert(session && fsm > 0 && event > None);
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   270
                if (!(session && fsm > 0 && event > None))
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                    return PEP_ILLEGAL_VALUE;
vb@2870
   272
vb@2870
   273
                PEP_STATUS status = PEP_STATUS_OK;
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   274
vb@2888
   275
                if (!session->inject_«yml:lcase(@name)»_event)
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   276
                   return PEP_«yml:ucase(@name)»_NO_INJECT_CALLBACK;
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   277
vb@2870
   278
                if (event < Extra) {
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                    msg = new_«@name»_message(fsm, event);
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                    if (!msg) {
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                        status = PEP_OUT_OF_MEMORY;
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                        goto the_end;
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                    }
vb@2870
   284
vb@2870
   285
                    status = update_«@name»_message(session, msg);
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   286
                    if (status)
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                        goto the_end;
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   288
                }
vb@2870
   289
vb@2888
   290
                ev = new_«@name»_event(fsm, event, msg);
vb@2870
   291
                if (!ev) {
vb@2870
   292
                    status = PEP_OUT_OF_MEMORY;
vb@2888
   293
                    goto the_end;
vb@2870
   294
                }
vb@2870
   295
vb@2870
   296
                int result = session->inject_«yml:lcase(@name)»_event(ev,
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   297
                        session->«yml:lcase(@name)»_management);
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   298
                if (result) {
vb@2870
   299
                    status = PEP_STATEMACHINE_ERROR;
vb@2888
   300
                    goto the_end;
vb@2870
   301
                }
vb@2888
   302
                return PEP_STATUS_OK;
vb@2870
   303
vb@2870
   304
            the_end:
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                free_«@name»_event(ev); // msg gets freed here
vb@2870
   306
                return status;
vb@2870
   307
            }
vb@2870
   308
vb@2888
   309
            PEP_STATUS signal_«@name»_message(
vb@2870
   310
                    PEP_SESSION session, 
vb@2888
   311
                    PEP_rating rating,
vb@2888
   312
                    const char *data,
vb@3143
   313
                    size_t size,
vb@3143
   314
                    const char *fpr
vb@2870
   315
                )
vb@2870
   316
            {
vb@2888
   317
                assert(session && data && size);
vb@2888
   318
                if (!(session && data && size))
vb@2870
   319
                    return PEP_ILLEGAL_VALUE;
vb@2870
   320
vb@2888
   321
                if (!session->inject_«yml:lcase(@name)»_event)
vb@2888
   322
                   return PEP_«yml:ucase(@name)»_NO_INJECT_CALLBACK;
vb@2870
   323
vb@2888
   324
                «@name»_t *msg = NULL;
vb@2888
   325
                PEP_STATUS status = decode_«@name»_message(data, size, &msg);
vb@2888
   326
                if (status)
vb@2888
   327
                    return status;
vb@2888
   328
vb@2890
   329
                «@name»_event_t *ev = NULL;
vb@2890
   330
vb@3117
   331
                «@name»_PR fsm = msg->present;
vb@3118
   332
                int event = 0;
vb@3117
   333
vb@3117
   334
                switch (fsm) {
vb@2890
   335
                    `` apply "fsm", 2, mode=signal_message
vb@2890
   336
                    default:
vb@2890
   337
                        status = PEP_«yml:ucase(@name)»_ILLEGAL_MESSAGE;
vb@2890
   338
                        goto the_end;
vb@2890
   339
                }
vb@2890
   340
vb@3144
   341
                if (fpr) {
vb@3144
   342
                    if (session->«yml:lcase(@name)»_state.common.from->fpr)
vb@3144
   343
                        free(session->«yml:lcase(@name)»_state.common.from->fpr);
vb@3144
   344
                    session->«yml:lcase(@name)»_state.common.from->fpr = strdup(fpr);
vb@3144
   345
                    assert(session->«yml:lcase(@name)»_state.common.from->fpr);
vb@3144
   346
                    if (!session->«yml:lcase(@name)»_state.common.from->fpr) {
vb@3144
   347
                        status = PEP_OUT_OF_MEMORY;
vb@3144
   348
                        goto the_end;
vb@3144
   349
                    }
vb@3143
   350
                }
vb@3143
   351
vb@3117
   352
                ev = new_«@name»_event(fsm, event, msg);
vb@2888
   353
                if (!ev) {
vb@2829
   354
                    status = PEP_OUT_OF_MEMORY;
vb@2888
   355
                    goto the_end;
vb@2829
   356
                }
vb@2829
   357
vb@2888
   358
                int result = session->inject_«yml:lcase(@name)»_event(ev,
vb@2888
   359
                        session->«yml:lcase(@name)»_management);
vb@2888
   360
                if (result) {
vb@2888
   361
                    status = PEP_STATEMACHINE_ERROR;
vb@2888
   362
                    goto the_end;
vb@2888
   363
                }
vb@3143
   364
vb@2888
   365
                return PEP_STATUS_OK;
vb@2870
   366
vb@2870
   367
            the_end:
krista@3331
   368
                free_«@name»_event(ev); // msg gets freed here
vb@2870
   369
                return status;
vb@2829
   370
            }
vb@2829
   371
vb@2870
   372
            PEP_STATUS send_«@name»_message(
vb@2870
   373
                    PEP_SESSION session, 
vb@2870
   374
                    «@name»_PR fsm,
vb@2870
   375
                    int message_type
vb@2870
   376
                )
vb@2870
   377
            {
vb@2870
   378
                PEP_STATUS status = PEP_STATUS_OK;
vb@2829
   379
vb@2870
   380
                assert(session && fsm > None && message_type > None);
vb@2870
   381
                if (!(session && fsm > None && message_type > None))
vb@2870
   382
                    return PEP_ILLEGAL_VALUE;
vb@2870
   383
                
vb@2870
   384
                «@name»_t *msg = new_«@name»_message(fsm, message_type);
vb@2870
   385
                if (!msg)
vb@2870
   386
                    return PEP_OUT_OF_MEMORY;
vb@2870
   387
vb@2870
   388
                char *data = NULL;
vb@2870
   389
                message *m = NULL;
vb@2870
   390
                identity_list *channels = NULL;
vb@2870
   391
vb@2870
   392
                status = update_«@name»_message(session, msg);
vb@2870
   393
                if (status)
vb@2870
   394
                    goto the_end;
vb@2870
   395
vb@2870
   396
                size_t size = 0;
vb@2870
   397
                status = encode_«@name»_message(msg, &data, &size);
vb@2870
   398
                if (status)
vb@2870
   399
                    goto the_end;
vb@2870
   400
vb@2870
   401
                switch (message_type) {
vb@2871
   402
                    // these messages are being broadcasted
vb@2877
   403
                    `` for "fsm/message[@type='broadcast']" |>> case «../@name»__payload_PR_«yml:mixedCase(@name)»:
vb@2871
   404
                        status = _own_identities_retrieve(session, &channels, PEP_idf_not_for_«yml:lcase(@name)»);
vb@2875
   405
                        if (status)
vb@2870
   406
                            goto the_end;
vb@2871
   407
vb@2871
   408
                        if (!(channels && channels->ident)) {
vb@3240
   409
                            // status = PEP_«yml:ucase(@name)»_NO_CHANNEL;
vb@3240
   410
                            // we don't check for having a channel, because if
vb@3240
   411
                            // this is initial setup before having an own
vb@3240
   412
                            // identity we're fine
vb@2871
   413
                            goto the_end;
vb@2871
   414
                        }
vb@2870
   415
                        break;
vb@2870
   416
vb@2877
   417
                    // these go anycast; previously used address is sticky (unicast)
vb@2877
   418
                    `` for "fsm/message[@type='anycast']" |>> case «../@name»__payload_PR_«yml:mixedCase(@name)»:
vb@2870
   419
                        if (!session->«yml:lcase(@name)»_state.common.from `> |`|
vb@2870
   420
                            (session->«yml:lcase(@name)»_state.common.from->flags &
vb@2871
   421
                            PEP_idf_not_for_«yml:lcase(@name)»)) {
vb@2870
   422
vb@2870
   423
                            // no address available yet, try to find one
vb@2871
   424
                            status = _own_identities_retrieve(session, &channels, PEP_idf_not_for_«yml:lcase(@name)»);
vb@2870
   425
                            if (!status)
vb@2870
   426
                                goto the_end;
vb@2870
   427
                            break;
vb@2870
   428
vb@2870
   429
                            if (channels && channels->ident) {
vb@2870
   430
                                // only need the first one
vb@2870
   431
                                free_identity_list(channels->next);
vb@2870
   432
                                channels->next = NULL;
vb@2870
   433
                            }
vb@2870
   434
                            else {
vb@2871
   435
                                status = PEP_«yml:ucase(@name)»_NO_CHANNEL;
vb@2870
   436
                                goto the_end;
vb@2870
   437
                            }
vb@2870
   438
                        }
vb@2870
   439
                        else {
vb@2870
   440
                            pEp_identity *channel = identity_dup(session->«yml:lcase(@name)»_state.common.from);
vb@2870
   441
                            if (!channel) {
vb@2870
   442
                                status = PEP_OUT_OF_MEMORY;
vb@2870
   443
                                goto the_end;
vb@2870
   444
                            }
vb@2870
   445
vb@2870
   446
                            channels = new_identity_list(channel);
vb@2870
   447
                            if (!channels) {
vb@2870
   448
                                status = PEP_OUT_OF_MEMORY;
vb@2870
   449
                                goto the_end;
vb@2870
   450
                            }
vb@2870
   451
                        }
vb@2877
   452
vb@2877
   453
                    default:
vb@2877
   454
                        status = PEP_«yml:ucase(@name)»_ILLEGAL_MESSAGE;
vb@2877
   455
                        goto the_end;
vb@2870
   456
                }
vb@2870
   457
vb@2870
   458
                for (identity_list *li = channels; li && li->ident ; li = li->next) {
vb@2878
   459
                    message *_m = NULL;
vb@2944
   460
                    char *_data = NULL;
vb@2944
   461
                    
vb@2944
   462
                    _data = malloc(size);
vb@2944
   463
                    assert(_data);
vb@2944
   464
                    if (!_data) {
vb@2944
   465
                        status = PEP_OUT_OF_MEMORY;
vb@2944
   466
                        goto the_end;
vb@2944
   467
                    }
vb@2944
   468
                    memcpy(_data, data, size);
vb@2875
   469
vb@2878
   470
                    switch (message_type) {
vb@2878
   471
                    `` for "fsm/message[@security='unencrypted']" |>>> case «../@name»__payload_PR_«yml:mixedCase(@name)»:
vb@3129
   472
                            status = base_prepare_message(
vb@3143
   473
                                    session,
vb@3129
   474
                                    li->ident,
vb@3129
   475
                                    li->ident,
vb@3129
   476
                                    _data,
vb@3129
   477
                                    size,
vb@3129
   478
                                    li->ident->fpr,
vb@3129
   479
                                    &_m
vb@3129
   480
                                );
vb@3129
   481
                            if (status) {
vb@3129
   482
                                free(_data);
vb@3129
   483
                                goto the_end;
vb@3129
   484
                            }
Thomas@3127
   485
                            attach_own_key(session, _m);
vb@2878
   486
                            m = _m;
vb@2878
   487
                            break;
vb@2878
   488
vb@2878
   489
                        default:
vb@3129
   490
                            status = base_prepare_message(
vb@3143
   491
                                    session,
vb@3129
   492
                                    li->ident,
vb@3129
   493
                                    li->ident,
vb@3129
   494
                                    _data,
vb@3129
   495
                                    size,
vb@3129
   496
                                    NULL,
vb@3129
   497
                                    &_m
vb@3129
   498
                                );
vb@3129
   499
                            if (status) {
vb@3129
   500
                                free(_data);
vb@3129
   501
                                goto the_end;
vb@3129
   502
                            }
vb@2878
   503
                            status = encrypt_message(session, _m, NULL, &m, PEP_enc_PEP, 0);
vb@2879
   504
                            if (status) {
vb@2899
   505
                                status = PEP_«yml:ucase(@name)»_CANNOT_ENCRYPT;
vb@2878
   506
                                goto the_end;
vb@2879
   507
                            }
vb@2878
   508
                            free_message(_m);
vb@2878
   509
                    }
vb@2878
   510
vb@2899
   511
                    status = session->messageToSend(m);
vb@2870
   512
                    m = NULL;
vb@2870
   513
                }
vb@2870
   514
vb@2870
   515
            the_end:
vb@2870
   516
                free_identity_list(channels);
vb@2870
   517
                free_message(m);
vb@2870
   518
                free(data);
vb@2870
   519
                free_«@name»_message(msg);
vb@2870
   520
                return status;
vb@2829
   521
            }
vb@2829
   522
vb@2870
   523
            PEP_STATUS recv_«@name»_event(
vb@2870
   524
                    PEP_SESSION session,
vb@2870
   525
                    «@name»_event_t *ev
vb@2870
   526
                )
vb@2870
   527
            {
vb@2870
   528
                assert(session && ev);
vb@2870
   529
                if (!(session && ev))
vb@2870
   530
                    return PEP_ILLEGAL_VALUE;
vb@2829
   531
vb@2870
   532
                PEP_STATUS status = PEP_STATUS_OK;
vb@2888
   533
                «@name»_PR fsm = (int) None;
vb@2888
   534
                int event = None;
vb@2829
   535
vb@2910
   536
                if (ev->event > None && ev->event < Extra) {
vb@2870
   537
                    status = update_«@name»_state(session, ev->msg, &fsm, &event);
vb@2870
   538
                    if (status)
vb@2888
   539
                        goto the_end;
vb@2829
   540
vb@2870
   541
                    if (ev->fsm) {
vb@2870
   542
                        if (ev->fsm != fsm |`> |` ev->event != event) {
vb@2870
   543
                            status = PEP_«yml:ucase(@name)»_ILLEGAL_MESSAGE;
vb@2888
   544
                            goto the_end;
vb@2870
   545
                        }
vb@2870
   546
                    }
vb@2888
   547
                    else if (ev->event) {
vb@2888
   548
                        status = PEP_«yml:ucase(@name)»_ILLEGAL_MESSAGE;
vb@2888
   549
                        goto the_end;
vb@2870
   550
                    }
vb@2870
   551
                }
vb@2888
   552
                else {
vb@2888
   553
                    fsm = ev->fsm;
vb@2888
   554
                    event = ev->event;
vb@2888
   555
                }
vb@2829
   556
vb@2888
   557
                status = «@name»_driver(session, fsm, event);
vb@2870
   558
vb@2888
   559
            the_end:
krista@3331
   560
                //free_«@name»_event(ev); // FIXME: We don't own this pointer. Are we sure it gets freed externally?
vb@2870
   561
                return status;
vb@2829
   562
            }
vb@2829
   563
vb@2870
   564
            ||
vb@2829
   565
        }
vb@2829
   566
vb@2829
   567
        apply "fsm", 0, mode=gen;
vb@2829
   568
    }
vb@2829
   569
vb@2909
   570
    template "fsm", mode=timeout
vb@2909
   571
    ||
vb@2909
   572
    static bool _«@name»_timeout(int state)
vb@2909
   573
    {
vb@2909
   574
        static int last_state = None;
vb@2909
   575
        static time_t switch_time = 0;
vb@2909
   576
vb@2909
   577
        if (state > Init) {
vb@2909
   578
            if (state == last_state) {
vb@2909
   579
                if (time(NULL) - switch_time > «yml:ucase(@name)»_THRESHOLD) {
vb@2909
   580
                    last_state = None;
vb@2909
   581
                    switch_time = 0;
vb@2909
   582
                    return true;
vb@2909
   583
                }
vb@2909
   584
            }
vb@2909
   585
            else {
vb@2909
   586
                last_state = state;
vb@2909
   587
                switch_time = time(NULL);
vb@2909
   588
            }
vb@2909
   589
        }
vb@2909
   590
        else {
vb@2909
   591
            last_state = None;
vb@2909
   592
            switch_time = 0;
vb@2909
   593
        }
vb@2909
   594
vb@2909
   595
        return false;
vb@2909
   596
    }
vb@2909
   597
vb@2909
   598
    ||
vb@2909
   599
vb@2909
   600
    template "fsm", mode=reset_state_machine
vb@2909
   601
    ||
vb@2909
   602
        case «../@name»_PR_«yml:lcase(@name)»: {
vb@2909
   603
            int state = session->«yml:lcase(../@name)»_state.«yml:lcase(@name)».state;
vb@2909
   604
            switch (state) {
vb@2909
   605
                `` for "state[@name!='InitState' and @timeout != 'off']" |>>> case «@name»:
vb@2909
   606
                    if (_«@name»_timeout(state)) {
vb@2909
   607
                        session->«yml:lcase(../@name)»_state.«yml:lcase(@name)».state = Init;
vb@2909
   608
                        event = Init;
vb@2914
   609
                        `` if "@threshold > 0" |>>>>> «@name»TimeoutHandler(session);
vb@2909
   610
                    }
vb@2909
   611
                    break;
vb@2909
   612
                
vb@2909
   613
                default:
vb@2909
   614
                    _«@name»_timeout(None);
vb@2909
   615
            }
vb@2909
   616
            break;
vb@2909
   617
        }
vb@2909
   618
vb@2909
   619
    ||
vb@2909
   620
vb@2890
   621
    template "fsm", mode=signal_message
vb@2890
   622
    {
vb@2890
   623
        ||
vb@2890
   624
        case «../@name»_PR_«yml:lcase(@name)»:
vb@3338
   625
            switch (msg->choice.«yml:lcase(@name)».payload.present) {
vb@2891
   626
        ||
vb@2891
   627
        if "message[@security='unencrypted']" {
vb@3338
   628
            |>> // these messages require a detached signature
vb@3338
   629
            for "message[@security='unencrypted']" {
vb@2891
   630
            ||
vb@3338
   631
                    case «../@name»__payload_PR_«yml:mixedCase(@name)»:
vb@3146
   632
                        if (!fpr) {
vb@3146
   633
                            status = PEP_«yml:ucase(ancestor::protocol/@name)»_ILLEGAL_MESSAGE;
vb@3146
   634
                            goto the_end;
vb@3146
   635
                        }
vb@3338
   636
                        event = «@name»;
vb@3117
   637
                        break;
vb@2890
   638
vb@2891
   639
            ||
vb@3338
   640
            }
vb@2891
   641
        }
vb@3338
   642
        if "message[@security='untrusted']" {
vb@3338
   643
            |>> // these messages must arrive encrypted
vb@3338
   644
            for "message[@security='untrusted']" {
vb@3338
   645
            ||
vb@3338
   646
                    case «../@name»__payload_PR_«yml:mixedCase(@name)»:
vb@3339
   647
                        if (rating < PEP_rating_reliable) {
vb@3338
   648
                            status = PEP_«yml:ucase(ancestor::protocol/@name)»_ILLEGAL_MESSAGE;
vb@3338
   649
                            goto the_end;
vb@3338
   650
                        }
vb@3338
   651
                        event = «@name»;
vb@3338
   652
                        break;
vb@3338
   653
vb@3338
   654
            ||
vb@3338
   655
            }
vb@3338
   656
        }
vb@3338
   657
        if "message[@security='trusted']" {
vb@3338
   658
            |>> // these messages must come through a trusted channel
vb@3338
   659
            for "message[@security='trusted']" {
vb@3338
   660
            ||
vb@3338
   661
                    case «../@name»__payload_PR_«yml:mixedCase(@name)»:
vb@3339
   662
                        if (rating < PEP_rating_trusted) {
vb@3338
   663
                            status = PEP_«yml:ucase(ancestor::protocol/@name)»_ILLEGAL_MESSAGE;
vb@3338
   664
                            goto the_end;
vb@3338
   665
                        }
vb@3338
   666
                        event = «@name»;
vb@3338
   667
                        break;
vb@3338
   668
vb@3338
   669
            ||
vb@3338
   670
            }
vb@3338
   671
        }
vb@2891
   672
        ||
vb@2890
   673
                default:
vb@2890
   674
                    status = PEP_«yml:ucase(ancestor::protocol/@name)»_ILLEGAL_MESSAGE;
vb@2890
   675
                    goto the_end;
vb@2890
   676
            }
vb@2890
   677
            break;
vb@2890
   678
vb@2890
   679
        ||
vb@2890
   680
    }
vb@2890
   681
vb@2838
   682
    template "fsm", mode=event
vb@2838
   683
    {
vb@2838
   684
    ||
vb@2843
   685
    case «../@name»_PR_«yml:lcase(@name)»: {
vb@2839
   686
        switch (msg->choice.«yml:lcase(@name)».payload.present) {
vb@2838
   687
    ||
vb@2838
   688
    for "message"
vb@2838
   689
    ||
vb@2838
   690
            case «../@name»__payload_PR_«yml:mixedCase(@name)»:
vb@2838
   691
                ev->event = «@name»;
vb@2838
   692
                break;
vb@2838
   693
    ||
vb@2838
   694
    ||
vb@2838
   695
            default:
vb@2838
   696
                // unknown message type
vb@2838
   697
                free(ev);
vb@2838
   698
                return NULL;
vb@2838
   699
        }
vb@2838
   700
        break;
vb@2838
   701
    }
vb@2838
   702
vb@2838
   703
    ||
vb@2838
   704
    }
vb@2838
   705
vb@2829
   706
    template "fsm", mode=driver
vb@2829
   707
    ||
vb@2843
   708
    case «../@name»_PR_«yml:lcase(@name)»: {
vb@2839
   709
        int state = session->«yml:lcase(../@name)»_state.«yml:lcase(@name)».state;
vb@2839
   710
        next_state = fsm_«@name»(session, state, event);
vb@2838
   711
        if (next_state > None) {
vb@2838
   712
            session->«yml:lcase(../@name)»_state.«yml:lcase(@name)».state = next_state;
vb@2838
   713
            event = Init;
vb@2838
   714
        }
vb@2838
   715
        else if (next_state < None) {
Hussein@3167
   716
            return PEP_STATEMACHINE_ERROR - next_state;
vb@2838
   717
        }
vb@2829
   718
        break;
vb@2829
   719
    }
vb@2829
   720
vb@2829
   721
    ||
vb@2829
   722
vb@2829
   723
    template "fsm", mode=gen {
vb@2829
   724
        document "generated/{@name}_fsm.h", "text" {
vb@2829
   725
        ||
vb@2829
   726
        // This file is under GNU General Public License 3.0
vb@2829
   727
        // see LICENSE.txt
vb@2829
   728
vb@2829
   729
        #pragma once
vb@2829
   730
vb@2829
   731
        #include "«../@name»_impl.h"
vb@2829
   732
vb@2829
   733
        #ifdef __cplusplus
vb@2829
   734
        extern "C" {
vb@2829
   735
        #endif
vb@2829
   736
vb@2829
   737
        // state machine for «@name»
krista@2271
   738
krista@2271
   739
        // states
krista@2271
   740
krista@2271
   741
        typedef enum _«@name»_state {
vb@2829
   742
            «@name»_state_None = None,
vb@2829
   743
            «@name»_state_Init = Init,
vb@2829
   744
        ||
vb@2829
   745
        for "func:distinctName(state[not(@name='InitState')])"
vb@2829
   746
            |> «@name»`if "position()!=last()" > , `
vb@2829
   747
        ||
krista@2271
   748
        } «@name»_state;
krista@2271
   749
krista@2271
   750
        // events
krista@2271
   751
krista@2271
   752
        typedef enum _«@name»_event {
vb@2829
   753
            «@name»_event_None = None,
vb@2829
   754
            «@name»_event_Init = Init,
krista@2271
   755
        ||
vb@2829
   756
        for "func:distinctName(state/event[not(not(../../message/@name=@name))])" {
krista@2271
   757
            const "name", "@name";
vb@2829
   758
            |> «$name» = «/protocol/fsm/message[@name=$name]/@id»,
krista@2271
   759
        }
vb@2830
   760
        for "func:distinctName(state/event[not(not(../../external/@name=@name))])" {
vb@2830
   761
            const "name", "@name";
vb@2830
   762
            |> «$name» = «/protocol/fsm/external[@name=$name]/@id»,
vb@2830
   763
        }
vb@2829
   764
        |> «@name»_event_Extra = Extra,
vb@2830
   765
        for "func:distinctName(state/event[not(../../message/@name=@name or ../../external/@name=@name)])" {
vb@2829
   766
            if "@name!='Init'"
vb@2829
   767
                |> «@name»`if "position()!=last()" > , `
vb@2829
   768
        }
krista@2271
   769
        ||
krista@2271
   770
        } «@name»_event;
krista@2271
   771
vb@2829
   772
        // state machine
krista@2271
   773
vb@2829
   774
        const char *«@name»_state_name(int state);
vb@2881
   775
        const char *«@name»_event_name(int event);
krista@2271
   776
vb@2838
   777
        // the state machine function is returning the next state in case of a
vb@2838
   778
        // transition or None for staying
vb@2838
   779
krista@2271
   780
        «@name»_state fsm_«@name»(
krista@2271
   781
                PEP_SESSION session,
krista@2271
   782
                «@name»_state state,
vb@2829
   783
                «@name»_event event
krista@2271
   784
            );
krista@2271
   785
krista@2271
   786
        #ifdef __cplusplus
krista@2271
   787
        }
krista@2271
   788
        #endif
krista@2271
   789
krista@2271
   790
        ||
krista@2271
   791
        }
vb@2829
   792
vb@2829
   793
        document "generated/{@name}_fsm.c", "text" {
krista@2271
   794
        ||
vb@2829
   795
        // This file is under GNU General Public License 3.0
vb@2829
   796
        // see LICENSE.txt
krista@2271
   797
vb@2829
   798
        #include "«@name»_fsm.h"
vb@2847
   799
        #include <stdlib.h>
krista@2271
   800
vb@2829
   801
        const char *«@name»_state_name(int state)
vb@2829
   802
        {
vb@2829
   803
            switch (state) {
vb@2829
   804
                case End:
vb@2829
   805
                    return "End";
vb@2829
   806
                case None:
vb@2829
   807
                    return "None";
vb@2829
   808
                case Init:
vb@2829
   809
                    return "InitState";
vb@2829
   810
        ||
vb@2829
   811
        for "func:distinctName(state[not(@name='InitState')])" {
vb@2829
   812
            |>> case «@name»:
vb@2829
   813
            |>>> return "«@name»";
vb@2829
   814
        }
vb@2829
   815
        ||
vb@2829
   816
                default:
vb@2829
   817
                    return "unknown state";
vb@2829
   818
            }
vb@2829
   819
        }
krista@2271
   820
vb@2881
   821
        const char *«@name»_event_name(int event)
vb@2881
   822
        {
vb@2881
   823
            switch (event) {
vb@2881
   824
                case None:
vb@2881
   825
                    return "None";
vb@2881
   826
                case Init:
vb@2881
   827
                    return "Init";
vb@2881
   828
        ||
vb@2881
   829
        for "func:distinctName(state/event[not(@name='Init')])" {
vb@2881
   830
            |>> case «@name»:
vb@2881
   831
            |>>> return "«@name»";
vb@2881
   832
        }
vb@2881
   833
        ||
vb@2881
   834
                default:
vb@2881
   835
                    return "unknown event";
vb@2881
   836
            }
vb@2881
   837
        }
vb@2881
   838
vb@2881
   839
vb@2829
   840
        static char *_str(int n, bool hex)
vb@2829
   841
        {
vb@2829
   842
            char *buf = calloc(1, 24);
vb@2829
   843
            assert(buf);
vb@2829
   844
            if (!buf)
vb@2829
   845
                return NULL;
vb@2829
   846
vb@2829
   847
            if (hex)
vb@2829
   848
                snprintf(buf, 24, "%.4x", n);
vb@2829
   849
            else
vb@2829
   850
                snprintf(buf, 24, "%d", n);
vb@2829
   851
            return buf;
vb@2829
   852
        }
vb@2829
   853
vb@2829
   854
        #define «@name»_ERR_LOG(t, d) log_event(session, (t), "«@name»", (d), "error")
vb@2829
   855
vb@2829
   856
        static PEP_STATUS _«@name»_ERR_LOG_int(PEP_SESSION session, char *t, int n, bool hex)
vb@2829
   857
        {
vb@2829
   858
            char *_buf = _str(n, hex);
vb@2829
   859
            if (!_buf)
vb@2829
   860
                return PEP_OUT_OF_MEMORY;
vb@2829
   861
            PEP_STATUS status = «@name»_ERR_LOG(t, _buf);
vb@2829
   862
            free(_buf);
vb@2829
   863
            return status;
vb@2829
   864
        }
vb@2829
   865
vb@2829
   866
        #define «@name»_ERR_LOG_INT(t, n) _«@name»_ERR_LOG_int(session, (t), (n), false)
vb@2829
   867
        #define «@name»_ERR_LOG_HEX(t, n) _«@name»_ERR_LOG_int(session, (t), (n), true)
vb@2829
   868
vb@2829
   869
        #ifndef SERVICE_LOG
vb@2829
   870
        // SERVICE LOG is meant to check session->service_log in runtime config;
vb@2829
   871
        // for older engines log more than needed
vb@2829
   872
        #define SERVICE_LOG(session, t, n, d) log_event((session), (t), (n), (d), "service")
vb@2829
   873
        #endif 
vb@2829
   874
vb@2829
   875
        #define «@name»_SERVICE_LOG(t, d) SERVICE_LOG(session, (t), "«@name»", (d))
vb@2829
   876
vb@2829
   877
        «@name»_state fsm_«@name»(
krista@2271
   878
                PEP_SESSION session,
vb@2829
   879
                «@name»_state state,
vb@2829
   880
                «@name»_event event
krista@2271
   881
            )
krista@2271
   882
        {
krista@2271
   883
            assert(session);
krista@2271
   884
            if (!session)
vb@2829
   885
                return invalid_state;
krista@2271
   886
krista@2271
   887
            switch (state) {
vb@2829
   888
                case None:
vb@2838
   889
                    return «@name»_state_Init;
vb@2829
   890
                
vb@2829
   891
                `` apply "state", 2, mode=fsm
krista@2271
   892
                default:
vb@2838
   893
                    «@name»_ERR_LOG_INT("invalid state", state);
vb@2829
   894
                    return invalid_state;
krista@2271
   895
            }
vb@2829
   896
            
vb@2838
   897
            return None;
krista@2271
   898
        }
krista@2271
   899
krista@2271
   900
        ||
vb@2829
   901
        }
vb@2829
   902
    }
vb@2829
   903
    
vb@2829
   904
    template "state", mode=fsm {
vb@2829
   905
        choose {
vb@2829
   906
            when "@name='InitState'" | case «../@name»_state_Init:
vb@2829
   907
            otherwise | case «@name»:
vb@2829
   908
        }
vb@2829
   909
        ||
vb@2829
   910
            «../@name»_SERVICE_LOG("in state", "«@name»");
vb@2829
   911
vb@2829
   912
            switch (event) {
vb@2829
   913
                case None:
vb@2829
   914
                    «../@name»_SERVICE_LOG("received None event", "ignoring");
vb@2838
   915
                    break;
vb@2829
   916
     
vb@2838
   917
        ||
vb@2838
   918
        if "not(event[@name='Init'])"
vb@2838
   919
        ||
vb@2838
   920
                case Init:
vb@2838
   921
                    // nothing to do
vb@2838
   922
                    break;
vb@2838
   923
vb@2838
   924
        ||
vb@2838
   925
        ||
vb@2829
   926
                `` apply "event", 2, mode=fsm
vb@2829
   927
                default:
vb@2885
   928
                    // ignore events not handled here
vb@2885
   929
                    «../@name»_SERVICE_LOG("ignoring event", KeySync_event_name(event));
vb@2885
   930
                    break;
vb@2829
   931
            }
vb@2829
   932
            break;
vb@2829
   933
vb@2829
   934
        ||
krista@2271
   935
    }
krista@2271
   936
vb@2829
   937
    template "event", mode=fsm {
vb@2829
   938
        | case «@name»: {
vb@2865
   939
        if "condition|action|send" |> PEP_STATUS status;
vb@2829
   940
        if "condition" |> bool result = false;
vb@2865
   941
        if "condition|action|send" |
krista@2271
   942
        ||
vb@2829
   943
            «../../@name»_SERVICE_LOG("received event", "«@name»");
vb@2907
   944
            `` apply "transition|action|condition|else|send";
vb@2829
   945
        ||
vb@2829
   946
        if "name(*[last()])!='transition'" {
vb@2829
   947
            |
vb@2843
   948
            |> «../../@name»_SERVICE_LOG("remaining in state", "«../@name»");
vb@2829
   949
            |> break;
vb@2829
   950
        }
vb@2829
   951
        ||
vb@2829
   952
        }
vb@2829
   953
        
vb@2829
   954
        ||
vb@2829
   955
    }
vb@2829
   956
vb@2829
   957
    template "transition" {
vb@2865
   958
        const "fsm", "ancestor::fsm";
krista@2271
   959
        ||
krista@2271
   960
vb@2829
   961
        «$fsm/@name»_SERVICE_LOG("transition to state", "«@target»");
vb@2838
   962
        return «@target»;
krista@2271
   963
        ||
vb@2829
   964
    }
krista@2271
   965
vb@2865
   966
    template "send" {
vb@2865
   967
        const "fsm", "ancestor::fsm";
vb@2865
   968
        const "protocol", "ancestor::protocol";
vb@2865
   969
        ||
vb@2865
   970
vb@2865
   971
        «$fsm/@name»_SERVICE_LOG("send message", "«@name»");
vb@2865
   972
        status = send_«$protocol/@name»_message(session, «$fsm/@id», «$fsm/@name»__payload_PR_«yml:mixedCase(@name)»);
vb@3089
   973
        if (status == PEP_OUT_OF_MEMORY)
vb@3089
   974
            return out_of_memory;
vb@3089
   975
        if (status) {
vb@3089
   976
            «$fsm/@name»_ERR_LOG_HEX("sending «@name» failed", status);
vb@3089
   977
            return cannot_send;
vb@3089
   978
        }
vb@2865
   979
        ||
vb@2865
   980
    }
vb@2865
   981
vb@2829
   982
    template "action" {
vb@2865
   983
        const "fsm", "ancestor::fsm";
vb@2865
   984
        ||
vb@2829
   985
vb@2865
   986
        «$fsm/@name»_SERVICE_LOG("do action", "«@name»");
vb@2865
   987
        status = «@name»(session);
vb@3089
   988
        if (status == PEP_OUT_OF_MEMORY)
vb@3089
   989
            return out_of_memory;
vb@2829
   990
        if (status) {
vb@2829
   991
            «$fsm/@name»_ERR_LOG_HEX("executing action «@name»() failed", status);
vb@2829
   992
            return invalid_action;
krista@2271
   993
        }
krista@2271
   994
        ||
krista@2271
   995
    }
krista@2271
   996
vb@2829
   997
    template "condition" {
vb@2865
   998
        const "fsm", "ancestor::fsm";
krista@2271
   999
        ||
krista@2271
  1000
vb@2829
  1001
        status = «@name»(session, &result);
vb@3089
  1002
        if (status == PEP_OUT_OF_MEMORY)
vb@3089
  1003
            return out_of_memory;
vb@2829
  1004
        if (status) {
vb@2829
  1005
            «$fsm/@name»_ERR_LOG_HEX("computing condition «@name» failed", status);
vb@2829
  1006
            return invalid_condition;
krista@2271
  1007
        }
vb@2829
  1008
        if (result) {
vb@2843
  1009
            «$fsm/@name»_SERVICE_LOG("condition applies", "«@name»");
krista@2271
  1010
        ||
vb@2907
  1011
        apply "transition|action|condition|else|send";
vb@2907
  1012
        | }
vb@2907
  1013
    }
vb@2907
  1014
vb@2907
  1015
    template "else" {
vb@2907
  1016
        if "not(name(preceding-sibling::*[last()]) = 'condition')"
vb@2907
  1017
            error "else without if";
vb@2907
  1018
vb@2907
  1019
        | else {
vb@2907
  1020
        |> «ancestor::fsm/@name»_SERVICE_LOG("condition does not apply", "«preceding-sibling::*[last()]/@name»");
vb@2907
  1021
        apply "transition|action|condition|else|send";
krista@2271
  1022
        | }
krista@2271
  1023
    }
krista@2271
  1024
}