input_gssapi_token
ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token);
static int input_gssapi_token(int type, uint32_t plen, struct ssh *ssh);
static int input_gssapi_token(int type, uint32_t, struct ssh *);
ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token);