Function sys_getsockopt

components/lwp/lwp_syscall.c:5392–5430

* @brief Retrieves the value of a socket option. * * This system call retrieves the current value of a socket option for the specified socket. The socket * options allow fine-grained control over various aspects of socket behavior, such as timeouts, buffering, * and connection settings. The option value is stored in the `optval` buffer, and the size of the buffer * is specified by the `optlen

 *          Failing to provide a correctly sized buffer could result in undefined behavior or buffer overflows.
 */
sysret_t sys_getsockopt(int socket, int level, int optname, void *optval, socklen_t *optlen)
{
    int ret = 0;
    socklen_t koptlen = 0;
    void *koptval = RT_NULL;

    if (!lwp_user_accessable((void *)optlen, sizeof(uint32_t)))
        return -EFAULT;

    if (lwp_get_from_user(&koptlen, optlen, sizeof(uint32_t)) != sizeof(uint32_t))
    {
        return -EINVAL;
    }

    if (!lwp_user_accessable((void *)optval, koptlen))
        return -EFAULT;

    koptval = kmem_get(koptlen);
    if (koptval == RT_NULL)
    {
        return -ENOMEM;
    }

    if (lwp_get_from_user(koptval, optval, koptlen) != koptlen)
    {
        kmem_put(koptval);
        return -EINVAL;
    }

    convert_sockopt(&level, &optname);
    ret = getsockopt(socket, level, optname, koptval, &koptlen);

    lwp_put_to_user((void *)optval, koptval, koptlen);
    lwp_put_to_user((void *)optlen, &koptlen, sizeof(uint32_t));

    kmem_put(koptval);

    return (ret < 0 ? GET_ERRNO() : ret);
}

/**
 * @brief Sets the value of a socket option.