deauthentication.c

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/* Copyright 2021 The libwifi Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#include "deauthentication.h"
#include "common.h"
 
#include <errno.h>
#include <stdlib.h>
#include <string.h>
 
int libwifi_parse_deauth(struct libwifi_parsed_deauth *deauth, struct libwifi_frame *frame) {
    memset(deauth, 0, sizeof(struct libwifi_parsed_deauth));
 
    int tags_len = 0;
 
    if (frame->frame_control.type != TYPE_MANAGEMENT || frame->frame_control.subtype != SUBTYPE_DEAUTH) {
        return -EINVAL;
    }
 
    deauth->ordered = frame->frame_control.flags.ordered;
 
    if (deauth->ordered) {
        memcpy(&deauth->frame_header.ordered, &frame->header.mgmt_ordered,
               sizeof(struct libwifi_mgmt_ordered_frame_header));
        tags_len = (frame->len - sizeof(struct libwifi_mgmt_ordered_frame_header) -
                    sizeof(struct libwifi_deauth_fixed_parameters));
    } else {
        memcpy(&deauth->frame_header.unordered, &frame->header.mgmt_unordered,
               sizeof(struct libwifi_mgmt_unordered_frame_header));
        tags_len = (frame->len - sizeof(struct libwifi_mgmt_unordered_frame_header) -
                    sizeof(struct libwifi_deauth_fixed_parameters));
    }
 
    unsigned char *body = (unsigned char *) frame->body;
 
    memcpy(&deauth->fixed_parameters, body, sizeof(struct libwifi_deauth_fixed_parameters));
    body += sizeof(struct libwifi_deauth_fixed_parameters);
 
    deauth->tags.parameters = malloc(tags_len);
    memcpy(&deauth->tags.parameters, body, tags_len);
    memcpy(&deauth->tags.length, &tags_len, sizeof(tags_len));
 
    return 0;
}