exchange_establish
exchange_establish(name, 0, 0, 0);
exchange_establish(peer, exchange_establish_finalize,
extern void exchange_establish(char *name, void (*)(struct exchange *,
exchange_establish(conn, pf_key_v2_stayalive, conn, 0);
exchange_establish(sa->name, 0, 0, 0);
exchange_establish(sa->name, 0, 0, 1);
exchange_establish(sa->name, 0, 0, 1);