Function sys_getsockname

components/lwp/lwp_syscall.c:5321–5361

* @brief Retrieves the local address of the socket. * * This system call retrieves the local address (local endpoint) that is bound to the specified socket. * The socket must be created and, if necessary, bound to a local address using `sys_bind`. The address * of the local endpoint is stored in the `name` structure, and the size of the structure is updated in `namelen`. * * @param[in] sock

 *          Failing to provide a correctly sized `namelen` could result in buffer overflows or undefined behavior.
 */
sysret_t sys_getsockname(int socket, struct musl_sockaddr *name, socklen_t *namelen)
{
    int ret = -1;
    struct sockaddr sa;
    struct musl_sockaddr kname;
    socklen_t unamelen;
    socklen_t knamelen;

    if (!lwp_user_accessable(namelen, sizeof (socklen_t)))
    {
        return -EFAULT;
    }
    lwp_get_from_user(&unamelen, namelen, sizeof (socklen_t));
    if (!unamelen)
    {
        return -EINVAL;
    }

    if (!lwp_user_accessable(name, unamelen))
    {
        return -EFAULT;
    }

    knamelen = sizeof(struct sockaddr);
    ret = getsockname(socket, &sa, &knamelen);
    if (ret == 0)
    {
        sockaddr_tomusl(&sa, &kname);
        if (unamelen > sizeof(struct musl_sockaddr))
        {
            unamelen = sizeof(struct musl_sockaddr);
        }
        lwp_put_to_user(name, &kname, unamelen);
        lwp_put_to_user(namelen, &unamelen, sizeof(socklen_t));
    }
    else
    {
        ret = GET_ERRNO();
    }
    return ret;
}

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