Mark Andrews writes:
>
> Mark Andrews writes:
> >
> > And whomever added underscorechar() to that should be shot. There
> > are good reasons to be able to distingish hostnames from other sorts
> > of text. Adding '_' doesn't help one do that as it is impossible to
> > distinguish underscored text from underscored hostnames.
> >
> > T h i s _i s _a _t i t l e
>
> Lets try the example again.
>
> _T_h_i_s__i_s__a__t_i_t_l_e
Or even better
_A_ _q_u_e_s_t_i_o_n_ _a_b_o_u_t_
_e_x_a_m_p_l_e_._c_o_m_.
>
> > Mark
> >
> > In message <20151118212633.ga18...@sources.org>, Stephane Bortzmeyer writes
> :
> > > On Wed, Nov 18, 2015 at 12:19:57PM +0000,
> > > Phil Mayers <p.may...@imperial.ac.uk> wrote
> > > a message of 44 lines which said:
> > >
> > > > I suspect getaddrinfo isn't parsing the DNS response for some reason.
> > > ...
> > > > Obviously the *.thing on the RHS of the first CNAME is weird, but is it
> > > > illegal?
> > >
> > > Yes, for a *host* name (no for a *domain* name). See Tony Finch's
> > > explanation.
> > >
> > > In the GNU libc, the relevant code is in resolv/res_comp.c and
> > > includes this function, which tests that a *host* name is
> > > a-z0-9\.\-+:
> > >
> > > #define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \
> > > || ((c) >= 0x61 && (c) <= 0x7a))
> > > #define digitchar(c) ((c) >= 0x30 && (c) <= 0x39)
> > >
> > > #define borderchar(c) (alphachar(c) || digitchar(c))
> > > #define middlechar(c) (borderchar(c) || hyphenchar(c) ||
> > > underscorechar(c))
> > > #define domainchar(c) ((c) > 0x20 && (c) < 0x7f)
> > >
> > > int
> > > res_hnok(const char *dn) {
> > > int pch = PERIOD, ch = *dn++;
> > >
> > > while (ch != '\0') {
> > > int nch = *dn++;
> > >
> > > if (periodchar(ch)) {
> > > (void)NULL;
> > > } else if (periodchar(pch)) {
> > > if (!borderchar(ch))
> > > return (0);
> > > } else if (periodchar(nch) || nch == '\0') {
> > > if (!borderchar(ch))
> > > return (0);
> > > } else {
> > > if (!middlechar(ch))
> > > return (0);
> > > }
> > > pch = ch, ch = nch;
> > > }
> > > return (1);
> > > }
> > > _______________________________________________
> > > Please visit https://lists.isc.org/mailman/listinfo/bind-users to
> > > unsubscribe from this list
> > >
> > > bind-users mailing list
> > > bind-users@lists.isc.org
> > > https://lists.isc.org/mailman/listinfo/bind-users
> >
> > --
> > Mark Andrews, ISC
> > 1 Seymour St., Dundas Valley, NSW 2117, Australia
> > PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org
> --
> Mark Andrews, ISC
> 1 Seymour St., Dundas Valley, NSW 2117, Australia
> PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org
_______________________________________________
Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe
from this list
bind-users mailing list
bind-users@lists.isc.org
https://lists.isc.org/mailman/listinfo/bind-users
