sppp_auth_send
static void sppp_auth_send(const struct cp *, struct sppp *,
sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->scp[IDX_CHAP].confid,
sppp_auth_send(&chap, sp, CHAP_RESPONSE, sp->scp[IDX_CHAP].rconfid,
sppp_auth_send(&pap, sp, PAP_REQ, sp->scp[IDX_PAP].confid,
sppp_auth_send(cp, sp, type, ident, mlen, (const u_char *)msg, 0);