transaction.c

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/*
 *   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
 */
 
/**
 * $Id: 4e8118c7bb7cb93bfa7fa37fe88ed73083769f11 $
 *
 * @file unlang/transaction.c
 * @brief Allows for edit transactions
 *
 * @copyright 2023 Network RADIUS SAS (legal@networkradius.com)
 */
 
RCSID("$Id: 4e8118c7bb7cb93bfa7fa37fe88ed73083769f11 $")
 
#include <freeradius-devel/util/syserror.h>
#include "transaction.h"
#include "transaction_priv.h"
 
/** Signal a transaction to abort.
 *
 * @param[in] request           The current request.
 * @param[in] frame             being signalled.
 * @param[in] action            to signal.
 */
static void unlang_transaction_signal(UNUSED request_t *request, unlang_stack_frame_t *frame, fr_signal_t action)
{
        unlang_frame_state_transaction_t *state = talloc_get_type_abort(frame->state,
                                                                        unlang_frame_state_transaction_t);
 
        /*
         *      Ignore everything except cancel.
         */
        if (action != FR_SIGNAL_CANCEL) return;
        
        fr_edit_list_abort(state->el);
        state->el = NULL;
}
 
/** Commit a successful transaction.
 *
 */
static unlang_action_t unlang_transaction_final(rlm_rcode_t *p_result, UNUSED request_t *request,
                                                unlang_stack_frame_t *frame)
{
        unlang_frame_state_transaction_t *state = talloc_get_type_abort(frame->state,
                                                                        unlang_frame_state_transaction_t);
 
        fr_assert(state->el != NULL);
 
        switch (*p_result) {
        case RLM_MODULE_REJECT:
        case RLM_MODULE_FAIL:
        case RLM_MODULE_INVALID:
        case RLM_MODULE_DISALLOW:
                fr_edit_list_abort(state->el);
                break;
        
        case RLM_MODULE_OK:
        case RLM_MODULE_HANDLED:
        case RLM_MODULE_NOOP:
        case RLM_MODULE_UPDATED:
                fr_edit_list_commit(state->el);
                break;
 
        default:
                fr_assert(0);
                return UNLANG_ACTION_FAIL;
        }
 
        return UNLANG_ACTION_CALCULATE_RESULT;
}
 
static unlang_action_t unlang_transaction(rlm_rcode_t *p_result, request_t *request, unlang_stack_frame_t *frame)
{
        unlang_frame_state_transaction_t        *state = talloc_get_type_abort(frame->state, unlang_frame_state_transaction_t);
        fr_edit_list_t *parent;
 
        parent = unlang_interpret_edit_list(request);
 
        MEM(state->el = fr_edit_list_alloc(state, 10, parent));
 
        frame_repeat(frame, unlang_transaction_final);
 
        return unlang_interpret_push_children(p_result, request, frame->result, UNLANG_NEXT_SIBLING);
}
 
fr_edit_list_t *unlang_interpret_edit_list(request_t *request)
{
        unlang_stack_frame_t    *frame;
        unlang_stack_t          *stack = request->stack;
        int                     i, depth = stack->depth;
 
        if (depth == 1) return NULL;
 
        for (i = depth - 1; i > 0; i--) {
                unlang_frame_state_transaction_t *state;
 
                frame = &stack->frame[i];
                if (frame->instruction->type != UNLANG_TYPE_TRANSACTION) continue;
 
                state = talloc_get_type_abort(frame->state, unlang_frame_state_transaction_t);
                fr_assert(state->el != NULL);
 
                return state->el;
        }
 
        return NULL;
}
 
void unlang_transaction_init(void)
{
        unlang_register(UNLANG_TYPE_TRANSACTION,
                           &(unlang_op_t){
                                .name = "transaction",
                                .interpret = unlang_transaction,
                                .signal = unlang_transaction_signal,
                                .frame_state_size = sizeof(unlang_frame_state_transaction_t),
                                .frame_state_type = "unlang_frame_state_transaction_t",
                                .debug_braces = true
                           });
}