fix typos in comments, mainly s/extention/extension/ and s/sufficent/sufficient/

Default to check-names for safety.

add <netinet/in.h> because it is needed for sockaddr_in.

make the default to not check names.

expose res_check for the benefit of mDNS.

Bring back binary compatibility with the previous version of the resolver.
There was no room to allocate 16 bytes for _rnd in the struct in the _LP64
case, so we dynamically allocate now. Also put th

Bring back binary compatibility with the previous version of the resolver.
There was no room to allocate 16 bytes for _rnd in the struct in the _LP64
case, so we dynamically allocate now. Also put the _rnd field last, so that
we are bitwise compatible too. Now of course we've run out of space, so
next time will need to perform more evil tricks to fit.

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merge libbind

restore correct symbol protection and add a comment so that I don't
break this again.

sync with bind-9-5-0

Resolve conflicts.

Merge back all our changes.

u_intN_t -> uintN_t

de-__P -- the hack is long since useless. Discussed with christos,
matt, kleink, others. Approved by christos.

Resolve conflicts.

Provide an ifdef so that we can define an old style _res if we need to.

Removr parameter names from __h_errno_set() function declaration.
Without this the vax port fails to compile the okheaders regression
test, because the "err" parameter name shadows a global variable.

PR/25707: Love: remove _LIBC from res_state as suggested, so that res_ninit
calls in userland don't trash memory.

Provide access to the 5 symbols the bind8 resolver libc did.

provide unconditional access to _res via __res_state(). This will abort
for multi-threaded programs.

resolve conflicts.

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22270, verified by myself.

Remove variable names from prototypes.

transmission, not transmition.

implement EDNS0 support, as EDNS0 support will be made mandatory for
IPv6 transport-ready resolvers/DNS servers. need careful configuration
when enable it. (default config is not affected).
see manp

implement EDNS0 support, as EDNS0 support will be made mandatory for
IPv6 transport-ready resolvers/DNS servers. need careful configuration
when enable it. (default config is not affected).
see manpage for details.

XXX visible symbol __res_opt() is added, however, it is not supposed to be
called from outside, libc minor is not bumped.

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define IPv6 library functions and structures, as defined in
RFC2292 and RFC2553.
define internal state structure for IPv6-transport resolver.

Commits for source code will follow.