ssh_msg_send
int ssh_msg_send(int, u_char, struct sshbuf *);
if (ssh_msg_send(STDOUT_FILENO, version, b) == -1)
if ((r = ssh_msg_send(fd, SSH_SK_HELPER_VERSION, req)) != 0) {
if (ssh_msg_send(out, SSH_SK_HELPER_VERSION, resp) == -1)
if (ssh_msg_send(to[1], version, b) == -1)