rlm_always.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: f954669b977ef0da53694bfe10ae3ed4889588f1 $
 * @file rlm_always.c
 * @brief Return preconfigured fixed rcodes.
 *
 * @copyright 2000,2006 The FreeRADIUS server project
 */
RCSID("$Id: f954669b977ef0da53694bfe10ae3ed4889588f1 $")
 
#define LOG_PREFIX mctx->mi->name
 
#include <freeradius-devel/server/base.h>
#include <freeradius-devel/server/module.h>
#include <freeradius-devel/server/module_rlm.h>
#include <freeradius-devel/unlang/xlat_func.h>
 
/*
 *      Instance data is mprotected for runtime
 *      this is fine for the majority of module
 *      instances, but not for rlm_always.
 *
 *      This struct is allocated outside of the
 */
typedef struct {
        rlm_rcode_t             rcode;          //!< The integer constant representing rcode_str.
        bool                    force;          //!< If true, we force the rcode.
} rlm_always_mutable_t;
 
/*
 *      The instance data for rlm_always is the list of fake values we are
 *      going to return.
 */
typedef struct {
        char const              *rcode_str;     //!< The base value.
        module_instance_t       *mi;
        rlm_always_mutable_t    *mutable;
} rlm_always_t;
 
/*
 *      A mapping of configuration file names to internal variables.
 */
static const conf_parser_t module_config[] = {
        { FR_CONF_OFFSET("rcode", rlm_always_t, rcode_str), .dflt = "fail" },
        CONF_PARSER_TERMINATOR
};
 
static xlat_arg_parser_t const always_xlat_args[] = {
        { .single = true, .type = FR_TYPE_STRING },
        XLAT_ARG_PARSER_TERMINATOR
};
 
/** Set module status or rcode
 *
 * Look ma, no locks...
 *
 * Example: %db_status(fail)
 */
static xlat_action_t always_xlat(TALLOC_CTX *ctx, fr_dcursor_t *out,
                                 xlat_ctx_t const *xctx,
                                 request_t *request, fr_value_box_list_t *in)
{
        rlm_always_t            *inst = talloc_get_type_abort(xctx->mctx->mi->data, rlm_always_t);
        module_instance_t       *mi = inst->mi;
        char const              *status;
        char const              *p;
        fr_value_box_t          *vb;
        fr_value_box_t          *in_head = fr_value_box_list_head(in);
 
        /*
         *      Expand to the existing status
         */
        p = "alive";
        if (mi->force) {
                p = fr_table_str_by_value(rcode_table, mi->code, "<invalid>");
        }
 
        if (!in_head || in_head->vb_length == 0) goto done;
        status = in_head->vb_strvalue;
 
        /*
         *      Set the module status
         */
        if (strcmp(status, "alive") == 0) {
                mi->force = false;
        } else {
                int rcode;
 
                rcode = fr_table_value_by_str(rcode_table, status, RLM_MODULE_NOT_SET);
                if (rcode == RLM_MODULE_NOT_SET) {
                        RWARN("Unknown status \"%s\"", status);
                        return XLAT_ACTION_FAIL;
                }
 
                mi->code = rcode;
                mi->force = true;
 
        }
 
done:
 
        MEM(vb = fr_value_box_alloc_null(ctx));
        fr_value_box_strdup(vb, vb, NULL, p, false);
        fr_dcursor_append(out, vb);
 
        return XLAT_ACTION_DONE;
 
}
 
/*
 *      Just return the rcode ... this function is autz, auth, acct, and
 *      preacct!
 */
static unlang_action_t CC_HINT(nonnull) mod_always_return(rlm_rcode_t *p_result, module_ctx_t const *mctx, UNUSED request_t *request)
{
        rlm_always_t const *inst = talloc_get_type_abort_const(mctx->mi->data, rlm_always_t);
 
        RETURN_MODULE_RCODE(inst->mutable->rcode);
}
 
static int mod_detach(module_detach_ctx_t const *mctx)
{
        rlm_always_t    *inst = talloc_get_type_abort(mctx->mi->data, rlm_always_t);
 
        talloc_free(inst->mutable);
        return 0;
}
 
static int mod_instantiate(module_inst_ctx_t const *mctx)
{
        rlm_always_t    *inst = talloc_get_type_abort(mctx->mi->data, rlm_always_t);
 
        inst->mi = UNCONST(module_instance_t *, mctx->mi);
        if (!inst->mi) {
                cf_log_err(mctx->mi->conf, "Can't find the module instance data for this module: %s", mctx->mi->name);
                return -1;
        }
 
        /*
         *      Allocate this outside of the module instance data,
         *      as that gets mprotected
         */
        MEM(inst->mutable = talloc_zero(NULL, rlm_always_mutable_t));
 
        /*
         *      Convert the rcode string to an int
         */
        inst->mutable->rcode = fr_table_value_by_str(rcode_table, inst->rcode_str, RLM_MODULE_NOT_SET);
        if (inst->mutable->rcode == RLM_MODULE_NOT_SET) {
                cf_log_err(mctx->mi->conf, "rcode value \"%s\" is invalid", inst->rcode_str);
                return -1;
        }
 
        return 0;
}
 
static int mod_bootstrap(module_inst_ctx_t const *mctx)
{
        xlat_t          *xlat;
 
        xlat = module_rlm_xlat_register(mctx->mi->boot, mctx, NULL, always_xlat, FR_TYPE_STRING);
        xlat_func_args_set(xlat, always_xlat_args);
 
        return 0;
}
 
extern module_rlm_t rlm_always;
module_rlm_t rlm_always = {
        .common = {
                .magic          = MODULE_MAGIC_INIT,
                .name           = "always",
                .inst_size      = sizeof(rlm_always_t),
                .config         = module_config,
                .bootstrap      = mod_bootstrap,
                .instantiate    = mod_instantiate,
                .detach         = mod_detach
        },
        .method_group = {
                .bindings = (module_method_binding_t[]){
                        { .section = SECTION_NAME(CF_IDENT_ANY, CF_IDENT_ANY), .method = mod_always_return },
                        MODULE_BINDING_TERMINATOR
                }
        }
};