SSH2_MSG_CHANNEL_OPEN
if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
case SSH2_MSG_CHANNEL_OPEN:
(r = sshbuf_put_u8(b, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
if ((r = sshpkt_start(ssh, SSH2_MSG_CHANNEL_OPEN)) != 0 ||
ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN, &client_input_channel_open);
ssh_dispatch_set(ssh, SSH2_MSG_CHANNEL_OPEN, &server_input_channel_open);