xlat.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: 1f38486f764438020d24e650363c2f71fae70acd $
 * @file curl/xlat.c
 * @brief Generic xlat functions dependent on libcurl
 *
 * @copyright 2024 Arran Cudbard-Bell (a.cudbardb@freeradius.org)
 */
 
#include <freeradius-devel/util/value.h>
#include <freeradius-devel/unlang/xlat.h>
#include <freeradius-devel/curl/base.h>
#include <freeradius-devel/curl/xlat.h>
 
#include "base.h"
 
xlat_arg_parser_t const fr_curl_xlat_uri_args[] = {
        { .required = true, .concat = true, .type = FR_TYPE_STRING },
        XLAT_ARG_PARSER_TERMINATOR
};
 
xlat_arg_parser_t const fr_curl_xlat_safe_args[] = {
        { .required = true, .concat = true, .type = FR_TYPE_STRING },
        XLAT_ARG_PARSER_TERMINATOR
};
 
/** xlat function to escape URI encoded strings
 *
 */
xlat_action_t fr_curl_xlat_uri_escape(UNUSED TALLOC_CTX *ctx, fr_dcursor_t *out,
                                      UNUSED xlat_ctx_t const *xctx, UNUSED request_t *request,
                                      fr_value_box_list_t *in)
{
        fr_value_box_t  *to_escape = fr_value_box_list_pop_head(in);
        char            *escaped;
 
        escaped = curl_easy_escape(fr_curl_tmp_handle(), to_escape->vb_strvalue, to_escape->vb_length);
        if (!escaped) {
                talloc_free(to_escape);
                return XLAT_ACTION_FAIL;
        }
 
        /*
         *      Returned string the same length - nothing changed
         */
        if (strlen(escaped) == to_escape->vb_length) goto done;
 
        fr_value_box_clear_value(to_escape);
        MEM(fr_value_box_strdup(to_escape, to_escape, NULL, escaped, to_escape->tainted) >= 0);
 
done:
        curl_free(escaped);
        fr_dcursor_insert(out, to_escape);
 
        return XLAT_ACTION_DONE;
}
 
/** xlat function to unescape URI encoded strings
 *
 */
xlat_action_t fr_curl_xlat_uri_unescape(UNUSED TALLOC_CTX *ctx, fr_dcursor_t *out,
                                        UNUSED xlat_ctx_t const *xctx, UNUSED request_t *request,
                                        fr_value_box_list_t *in)
{
        fr_value_box_t  *to_unescape = fr_value_box_list_pop_head(in);
        int             unescaped_len;
        char            *unescaped;
 
        unescaped = curl_easy_unescape(fr_curl_tmp_handle(), to_unescape->vb_strvalue, to_unescape->vb_length, &unescaped_len);
        if (!unescaped) {
                talloc_free(to_unescape);
                return XLAT_ACTION_FAIL;
        }
 
        /*
         *      Returned string the same length - nothing changed
         */
        if ((size_t)unescaped_len == to_unescape->vb_length) {
                curl_free(unescaped);
                fr_dcursor_insert(out, to_unescape);
                return XLAT_ACTION_DONE;
        }
 
        fr_value_box_clear_value(to_unescape);
        MEM(fr_value_box_bstrndup(to_unescape, to_unescape, NULL, unescaped, unescaped_len, to_unescape->tainted) >= 0);
        curl_free(unescaped);
        fr_dcursor_insert(out, to_unescape);
 
        return XLAT_ACTION_DONE;
}