/*
 *  Copyright (C) 2004-2026 Savoir-faire Linux Inc.
 *
 *  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 3 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, see <https://www.gnu.org/licenses/>.
 */

#include <cstdlib>

#include "lib/gnutls.h"
#include "lib/sip-fmt.h"

/*
 * Example that will try to overflow the SDP parser.
 */
bool
mutate_gnutls_record_send(ChanneledMessage& msg)
{
    static size_t body_repeat = 1;

    SIPFmt sip(msg.data);

    /* Only SIP request */
    if (not sip.isRequest()) {
        return false;
    }

    /* Skip none SDP Content-Type */
    if (not sip.isApplication("media_control+xml")) {
        return false;
    }

    auto body = sip.getBody();
    std::vector<uint8_t> newBody;

    newBody.reserve(body_repeat * body.size());

    for (size_t i = 0; i < body_repeat; ++i) {
        for (auto it = body.cbegin(); it != body.cend(); ++it) {
            newBody.emplace_back(*it);
        }
    }

    sip.swapBody(newBody);

    body_repeat *= 2;

    /* Commit changes! */
    sip.swap(msg.data);

    return true;
}
