avoid various use-after-free issues.

create a ptrdiff_t offset between the start of an allocation region and
some interesting pointer, so it can be adjusted with this offset after
realloc() returns.

found by GCC 12.

lib: remove CONSTCOND comment

Since 2021-01-31, lint doesn't need it anymore for the common pattern of
'do ... while (0)'.

Don't complain about additional DNAME records received when resolving A or
AAAA (like already done for SIG/KEY and CNAME).

branches: 1.92.8; 1.92.18;
- fix various leaks on error
- don't use the wrong error variable in switch
- always set the error return code
- return consistent errors when the input data cannot be handled.

use fparseln() instead of abusing fgetln(), so that the last line that
might not have a terminating newline is processed.

branches: 1.90.2;
CID 1163170, 1164171, resource leak
CID 1161172 double free

fix memory allocation, and an off-by-one

the addition is handled in the alias.

Move more code into the macro, and fix the bug where realloc would cause
a dangling pointer and memory corruption.

Remove MAXALIASES limit

- don't clobber hp in the RES_USE_INET6 case
- increment naddrs in the yp case
- don't use __hostalias(), it is not thread-safe.

move the host file getbyname and getbyaddr functions to sethostent.c so
that they are in a separate file from the dns ones in order for libhack
to use them.

get rid of bogus + 1

fix gethostbyaddr prototype per TOG.

appease lint.

Add not advertised reentrant functions: {get,set,end}hostent_r,
gethostbyname{,2}_r, gethostbyaddr_r. Make getnameinfo(3) use
gethostbyaddr_r(3) so it is re-entrant (ahem __ypdomain). These
are not being advertised because there is a bunch of different
implementation of them that have a variety of type signatures.

If people want to follow someone's implementation, it is now easy.

branches: 1.79.2;
implement no-check-names

PR/45989: Martin Husemann: lint invocation does include -w only on i386

- turn lint -w for all the platforms after fixing the lint warnings.
- add _DIAGASSERTS() for casts that would assign values to types that
would not fit.
- change types, add casts
- change into ansii prototypes
- turn on _DIAGNOSTIC for libc (during current, to be eliminated for release
builds)

approved by core@

branches: 1.77.2; 1.77.4;
close on exec fixes:
- open + fcntl -> open O_CLOEXEC
- configuration database file descriptors that can stay open are now opened
fopen(db, "re")

dprintf is claimed by posix.

Revert a -> an changes: Adding an 'n' follows pronunciation, not writing.

fix grammar: a -> an

branches: 1.73.18;
Appropriate versions are not supplied by bind anymore.

merge in resolver portion of bind-9.4.0-rc2

branches: 1.71.2; 1.71.4;
fix incomplete initializers

Coverity CID 2279: Plug memory leak.

Coverity CID 2280: Plug memory leak.

PR/32616: Yves-Emmanuel JUTARD: Fix compilation with -DDEBUG

Rest of fix for PR#31184: getaddrinfo() now honors resolv.conf sortlist
directive for dns answers.

Also, unifdef the RESLVSORT (non-)option sillyness.

Reviewed by christos.

Re-enable resolv.conf sortlist support in gethostbyname().

Fixes first part of PR#31184. addrsort() was not exposed to the rest of
libc as it turns out not to be usable for getaddrinfo(), so a different
sorter will be implemented for that.

appease gcc -Wuninitialized

Fix gethostent(3) (which was reenabled in rev 1.63) so that it actually
works by allowing _gethtent() to treat host.h_addrtype==0 && host.h_length==0
as "any address family" when parsing.

Restore gethostent() as a supported interface. Yes, it maybe obsolete
but it is specified by IEEE Std 1003.1, 2004 Edition (POSIX) and
the X/Open standards (Issue 6 and XNS 5.2).

* revert change removing gethostent() from gethostbyname(3) man page
* delete kruft from gethnamaddr.c leaving only gethostent() as a
wrapper around _gethtent().
* revert recent changes to <netdb.h>
+ restore gethostent() prototype
+ restore freehostent() prototype; handle similar to non-shipped
getipnodby*() prototypes
+ use correct XOPEN_SOURCE version (520 not 500) for freeaddrinfo()
prototype; interface specified by XNS5.2 not XNS5

Reviewd by <christos> and <drochner>.

now that e.f.f.3.ip6.arpa is ready, we no longer need to query ip6.int

Change remaining K&R style function definition to ANSI; Reviewd by <christos>.

centralize res_*init() calls in __res_get_state()

Finish bind9 resolver merge.

branches: 1.58.2;
Back out rev. 1.56; `pointer points the byte just after the valid region'
is normal case. If the parser wants something more, there should be
another bounds check for it.

paren around macro arg

off-by-one. from millert@openbsd

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

Patches provided by Joel Baker in PR 22280, verified by myself.

bound copies

Fix signed/unsigned comparison warnings.

allocate 64K recieve buffer for DNS responses.

drop AAAA reply with IPv4 mapped address. sync w/kame
draft-itojun-v6ops-v4mapped-harmful-00.txt

set h_errno properly if internal string manipulation fails.

eliminate sprintf, use snprintf. check strlcat error.

query ip6.arpa then ip6.int for IPv6 reverse lookup. follows RFC3152.

correct DIAGASSERT

avoid remote buffer overrun on hostbuf[]. From: Joost Pol <joost@pine.nl>

correct bad practice in the code - it uses two changing variables
to manage buffer (buf and buflen). we eliminate buflen and use
fixed point (ep) as the ending pointer.

this fix is critical.

do not pass uninitialized variable to nsdispatch().

__STDC__ is always defined on NetBSD.

be picky about string manipulation in reverse lookups

branches: 1.42.2;
style

do not reverse-lookup scoped IPv6 address. it does not make sense as
there's no way to give scope identifier. sync w/kame

Change the `len' arguemtn to gethostbyaddr(3) from int to socklen_t in
accordance with XNS5.2; fixes PR standards/12703.

branches: 1.39.2;
remove redundant declarations.

Varargsify dprintf to allow for format string checking

on gethostby* with NIS backend, make a lookup against ipnodes.{byname,byaddr}
for non-IPv4 address. obeys solaris8 practice.

XXX does not support scoped address extension, as gethostby* are not
scope-aware. always use getaddrinfo/getnameinfo.
XXX it is not very useful at this moment, if you define multiple entries for
single hostname. see PR 10713 for detail.

plug host_addrs overrun. rogue NIS server can transmit tons of lines,
effectively overrun host_addrs buffer.

Passing "char" values to ctype(3) functions is problematic.
If an argument of a ctype function is outside "unsigned char"
and if it is not EOF, the behavior is undefined.

The isascii(3) is the sole exception of above and it was used to
be used to check a value was valid for other ctype functions in
ancient systems. On modern systems, the ctype functions take
all values of "unsigned char", and this check is obsolete and
even wrong for non-ASCII systems. However, we leave the isascii()
untouched for now, so as not to change the current behavior.

add CONSTCOND where appropriate

branches: 1.33.4;
Fix an alignment problem introduced by the patch for PR lib/8032.
Fixes PR lib/10048 by J.T. Conklin.

sync with BIND 4.9.7. strict boundary checking.

Try to silence some of the lint warnings. Unfortunately we cannot fix
them all right now until we fix the ALIGN() macro to return u_long in
all the ports.

Delint.

Delint.
Remove trailing ; from uses of __weak_alias(). The macro inserts this if
needed.

ignore KEY and SIG records when matching responses to the query. we
get those as extras from DNSsec-enabled name servers.

change default nsswitch.conf entry for `hosts' from:
hosts: dns files
to
hosts: files dns

this should speed things up a lot at boot if hostnames that are in
/etc/hosts are used for ifconfig, route, etc.

branches: 1.26.2;
back out the #ifdef _DIAGNOSTIC argument checks; too many people complained.
_DIAGASSERT() is still retained.

* use _DIAGASSERT() to check pointer arguments against NULL and file
descriptors against -1 (as appropriate).
* add actual checks which to detect stuff that would trigger_DIAGASSERT(),
and attempt to return a sane error condition.
* knf some code
* remove some `register' decls.

the first two items result in the addition of code similar to the
following in various functions:

_DIAGASSERT(path != NULL)
#ifdef _DIAGNOSTIC
if (path == NULL) {
errno = EFAULT;
return (-1);
}
#endif

do not make reverse query against IPv6 unspecified, or loopback addresses.

From: ume@mahoroba.org

- make sure that host_addr is suitably aligned
- add appropriate casts
- take out & in from array; it is meaningless

Make sure that "h_addr_list" pointers are longword aligned because some
broken applications depend on it. Fixes PR lib/8032 by David K Brownlee.

fix name resolution problem when you have "hosts: files dns" on
/etc/nsswitch.conf.

This was because of two reasons:
- /etc/hosts lookup code damaged some of internal
state used by gethostbyname2().
- getaddrinfo() was not persistent enough against errors.

Sorry for the delay, and hope this fix all the following PRs
(I checked in my environment immitating those PRs and it worked for me)
PR: 7901, 7912, 7921

check address family on getting entries from /etc/hosts.

fix hardcoded T_A.
this fixes gethostbyname2(host, AF_INET6) to actually work.

As discussed on "tech-net@netbsd.org":
Enhance the file resolver to return all IP addresses of a host on a
call to gethostbyname().

Remove unused 'len' and the relevant gcc kludges.

Don't bother de-linting inside __GNUC__ ifdefs.

specifically include stdarg/varargs.h

branches: 1.14.2;
minor knf; don't exceed 80 columns ;)

add ARGSUSED

constify ns_dtab defs

convert to new nsdispatch(3). lookup defaults back to "dns files"

before each call to nsdispatch(), set h_errno to NETDB_INTERNAL, and only
change to NETDB_SUCCESS if nsdispatch() returns NS_SUCCESS. it is up to the
internal methods to change h_errno from NETDB_INTERNAL to a more appropriate
value when an error is detected.

pull nsswitch up to main branch
convert getnetby*() to nsswitch (from resolv.conf lookup)

delint

branches: 1.7.2;
(bcmp(), bcopy(), bzero()) -> (memcmp(), memcpy(), memset())

Since these files are shared with parts of the BIND-4 userland (outside libc),
do the internal symbol renaming dance only if inside the libc build environment.

Need internal names for gethostby{addr,name}().

$Id: -> Id: (to make hunting down other bad Ids easier).

Bring over changes where were mistakenly committed to gethostnamadr.c:

date: 1997/07/21 14:07:54; author: jtc; state: Exp; lines: +3 -2
If port provides __weak_alias(), provide an Standard C and POSIX pure
identifier namespace by renaming non standard functions and variables
such that they have a leading underscore. The library will use those
names internally. Weak aliases are used to provide the original names
to the API.

This is only the first part of this change. It is most of the functions
which are implemented in C for all NetBSD ports. Subsequent changes are
to add the same support to the remaining C files, to assembly files, and
to the automagically generated assembly source used for system calls.
When all of the above is done, ports with weak alias support should add
a definition for __weak_alias to <sys/cdefs.h>.

merge bind 4.9.6 resolver. still need to fix <resolv.h>

branches: 1.1.1;
Initial revision

lib: remove CONSTCOND comment

Since 2021-01-31, lint doesn't need it anymore for the common pattern of
'do ... while (0)'.

Don't complain about additional DNAME records received when resolving A or
AAAA (like already done for SIG/KEY and CNAME).

branches: 1.92.8; 1.92.18;
- fix various leaks on error
- don't use the wrong error variable in switch
- always set the error return code
- return consistent errors when the input data cannot be handled.

use fparseln() instead of abusing fgetln(), so that the last line that
might not have a terminating newline is processed.

branches: 1.90.2;
CID 1163170, 1164171, resource leak
CID 1161172 double free

fix memory allocation, and an off-by-one

the addition is handled in the alias.

Move more code into the macro, and fix the bug where realloc would cause
a dangling pointer and memory corruption.

Remove MAXALIASES limit

- don't clobber hp in the RES_USE_INET6 case
- increment naddrs in the yp case
- don't use __hostalias(), it is not thread-safe.

move the host file getbyname and getbyaddr functions to sethostent.c so
that they are in a separate file from the dns ones in order for libhack
to use them.

get rid of bogus + 1

fix gethostbyaddr prototype per TOG.

appease lint.

Add not advertised reentrant functions: {get,set,end}hostent_r,
gethostbyname{,2}_r, gethostbyaddr_r. Make getnameinfo(3) use
gethostbyaddr_r(3) so it is re-entrant (ahem __ypdomain). These
are not being advertised because there is a bunch of different
implementation of them that have a variety of type signatures.

If people want to follow someone's implementation, it is now easy.

branches: 1.79.2;
implement no-check-names

PR/45989: Martin Husemann: lint invocation does include -w only on i386

- turn lint -w for all the platforms after fixing the lint warnings.
- add _DIAGASSERTS() for casts that would assign values to types that
would not fit.
- change types, add casts
- change into ansii prototypes
- turn on _DIAGNOSTIC for libc (during current, to be eliminated for release
builds)

approved by core@

branches: 1.77.2; 1.77.4;
close on exec fixes:
- open + fcntl -> open O_CLOEXEC
- configuration database file descriptors that can stay open are now opened
fopen(db, "re")

dprintf is claimed by posix.

Revert a -> an changes: Adding an 'n' follows pronunciation, not writing.

fix grammar: a -> an

branches: 1.73.18;
Appropriate versions are not supplied by bind anymore.

merge in resolver portion of bind-9.4.0-rc2

branches: 1.71.2; 1.71.4;
fix incomplete initializers

Coverity CID 2279: Plug memory leak.

Coverity CID 2280: Plug memory leak.

PR/32616: Yves-Emmanuel JUTARD: Fix compilation with -DDEBUG

Rest of fix for PR#31184: getaddrinfo() now honors resolv.conf sortlist
directive for dns answers.

Also, unifdef the RESLVSORT (non-)option sillyness.

Reviewed by christos.

Re-enable resolv.conf sortlist support in gethostbyname().

Fixes first part of PR#31184. addrsort() was not exposed to the rest of
libc as it turns out not to be usable for getaddrinfo(), so a different
sorter will be implemented for that.

appease gcc -Wuninitialized

Fix gethostent(3) (which was reenabled in rev 1.63) so that it actually
works by allowing _gethtent() to treat host.h_addrtype==0 && host.h_length==0
as "any address family" when parsing.

Restore gethostent() as a supported interface. Yes, it maybe obsolete
but it is specified by IEEE Std 1003.1, 2004 Edition (POSIX) and
the X/Open standards (Issue 6 and XNS 5.2).

* revert change removing gethostent() from gethostbyname(3) man page
* delete kruft from gethnamaddr.c leaving only gethostent() as a
wrapper around _gethtent().
* revert recent changes to <netdb.h>
+ restore gethostent() prototype
+ restore freehostent() prototype; handle similar to non-shipped
getipnodby*() prototypes
+ use correct XOPEN_SOURCE version (520 not 500) for freeaddrinfo()
prototype; interface specified by XNS5.2 not XNS5

Reviewd by <christos> and <drochner>.

now that e.f.f.3.ip6.arpa is ready, we no longer need to query ip6.int

Change remaining K&R style function definition to ANSI; Reviewd by <christos>.

centralize res_*init() calls in __res_get_state()

Finish bind9 resolver merge.

branches: 1.58.2;
Back out rev. 1.56; `pointer points the byte just after the valid region'
is normal case. If the parser wants something more, there should be
another bounds check for it.

paren around macro arg

off-by-one. from millert@openbsd

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

Patches provided by Joel Baker in PR 22280, verified by myself.

bound copies

Fix signed/unsigned comparison warnings.

allocate 64K recieve buffer for DNS responses.

drop AAAA reply with IPv4 mapped address. sync w/kame
draft-itojun-v6ops-v4mapped-harmful-00.txt

set h_errno properly if internal string manipulation fails.

eliminate sprintf, use snprintf. check strlcat error.

query ip6.arpa then ip6.int for IPv6 reverse lookup. follows RFC3152.

correct DIAGASSERT

avoid remote buffer overrun on hostbuf[]. From: Joost Pol <joost@pine.nl>

correct bad practice in the code - it uses two changing variables
to manage buffer (buf and buflen). we eliminate buflen and use
fixed point (ep) as the ending pointer.

this fix is critical.

do not pass uninitialized variable to nsdispatch().

__STDC__ is always defined on NetBSD.

be picky about string manipulation in reverse lookups

branches: 1.42.2;
style

do not reverse-lookup scoped IPv6 address. it does not make sense as
there's no way to give scope identifier. sync w/kame

Change the `len' arguemtn to gethostbyaddr(3) from int to socklen_t in
accordance with XNS5.2; fixes PR standards/12703.

branches: 1.39.2;
remove redundant declarations.

Varargsify dprintf to allow for format string checking

on gethostby* with NIS backend, make a lookup against ipnodes.{byname,byaddr}
for non-IPv4 address. obeys solaris8 practice.

XXX does not support scoped address extension, as gethostby* are not
scope-aware. always use getaddrinfo/getnameinfo.
XXX it is not very useful at this moment, if you define multiple entries for
single hostname. see PR 10713 for detail.

plug host_addrs overrun. rogue NIS server can transmit tons of lines,
effectively overrun host_addrs buffer.

Passing "char" values to ctype(3) functions is problematic.
If an argument of a ctype function is outside "unsigned char"
and if it is not EOF, the behavior is undefined.

The isascii(3) is the sole exception of above and it was used to
be used to check a value was valid for other ctype functions in
ancient systems. On modern systems, the ctype functions take
all values of "unsigned char", and this check is obsolete and
even wrong for non-ASCII systems. However, we leave the isascii()
untouched for now, so as not to change the current behavior.

add CONSTCOND where appropriate

branches: 1.33.4;
Fix an alignment problem introduced by the patch for PR lib/8032.
Fixes PR lib/10048 by J.T. Conklin.

sync with BIND 4.9.7. strict boundary checking.

Try to silence some of the lint warnings. Unfortunately we cannot fix
them all right now until we fix the ALIGN() macro to return u_long in
all the ports.

Delint.

Delint.
Remove trailing ; from uses of __weak_alias(). The macro inserts this if
needed.

ignore KEY and SIG records when matching responses to the query. we
get those as extras from DNSsec-enabled name servers.

change default nsswitch.conf entry for `hosts' from:
hosts: dns files
to
hosts: files dns

this should speed things up a lot at boot if hostnames that are in
/etc/hosts are used for ifconfig, route, etc.

branches: 1.26.2;
back out the #ifdef _DIAGNOSTIC argument checks; too many people complained.
_DIAGASSERT() is still retained.

* use _DIAGASSERT() to check pointer arguments against NULL and file
descriptors against -1 (as appropriate).
* add actual checks which to detect stuff that would trigger_DIAGASSERT(),
and attempt to return a sane error condition.
* knf some code
* remove some `register' decls.

the first two items result in the addition of code similar to the
following in various functions:

_DIAGASSERT(path != NULL)
#ifdef _DIAGNOSTIC
if (path == NULL) {
errno = EFAULT;
return (-1);
}
#endif

do not make reverse query against IPv6 unspecified, or loopback addresses.

From: ume@mahoroba.org

- make sure that host_addr is suitably aligned
- add appropriate casts
- take out & in from array; it is meaningless

Make sure that "h_addr_list" pointers are longword aligned because some
broken applications depend on it. Fixes PR lib/8032 by David K Brownlee.

fix name resolution problem when you have "hosts: files dns" on
/etc/nsswitch.conf.

This was because of two reasons:
- /etc/hosts lookup code damaged some of internal
state used by gethostbyname2().
- getaddrinfo() was not persistent enough against errors.

Sorry for the delay, and hope this fix all the following PRs
(I checked in my environment immitating those PRs and it worked for me)
PR: 7901, 7912, 7921

check address family on getting entries from /etc/hosts.

fix hardcoded T_A.
this fixes gethostbyname2(host, AF_INET6) to actually work.

As discussed on "tech-net@netbsd.org":
Enhance the file resolver to return all IP addresses of a host on a
call to gethostbyname().

Remove unused 'len' and the relevant gcc kludges.

Don't bother de-linting inside __GNUC__ ifdefs.

specifically include stdarg/varargs.h

branches: 1.14.2;
minor knf; don't exceed 80 columns ;)

add ARGSUSED

constify ns_dtab defs

convert to new nsdispatch(3). lookup defaults back to "dns files"

before each call to nsdispatch(), set h_errno to NETDB_INTERNAL, and only
change to NETDB_SUCCESS if nsdispatch() returns NS_SUCCESS. it is up to the
internal methods to change h_errno from NETDB_INTERNAL to a more appropriate
value when an error is detected.

pull nsswitch up to main branch
convert getnetby*() to nsswitch (from resolv.conf lookup)

delint

branches: 1.7.2;
(bcmp(), bcopy(), bzero()) -> (memcmp(), memcpy(), memset())

Since these files are shared with parts of the BIND-4 userland (outside libc),
do the internal symbol renaming dance only if inside the libc build environment.

Need internal names for gethostby{addr,name}().

$Id: -> Id: (to make hunting down other bad Ids easier).

Bring over changes where were mistakenly committed to gethostnamadr.c:

date: 1997/07/21 14:07:54; author: jtc; state: Exp; lines: +3 -2
If port provides __weak_alias(), provide an Standard C and POSIX pure
identifier namespace by renaming non standard functions and variables
such that they have a leading underscore. The library will use those
names internally. Weak aliases are used to provide the original names
to the API.

This is only the first part of this change. It is most of the functions
which are implemented in C for all NetBSD ports. Subsequent changes are
to add the same support to the remaining C files, to assembly files, and
to the automagically generated assembly source used for system calls.
When all of the above is done, ports with weak alias support should add
a definition for __weak_alias to <sys/cdefs.h>.

merge bind 4.9.6 resolver. still need to fix <resolv.h>

branches: 1.1.1;
Initial revision

Don't complain about additional DNAME records received when resolving A or
AAAA (like already done for SIG/KEY and CNAME).

- fix various leaks on error
- don't use the wrong error variable in switch
- always set the error return code
- return consistent errors when the input data cannot be handled.

use fparseln() instead of abusing fgetln(), so that the last line that
might not have a terminating newline is processed.

branches: 1.90.2;
CID 1163170, 1164171, resource leak
CID 1161172 double free

fix memory allocation, and an off-by-one

the addition is handled in the alias.

Move more code into the macro, and fix the bug where realloc would cause
a dangling pointer and memory corruption.

Remove MAXALIASES limit

- don't clobber hp in the RES_USE_INET6 case
- increment naddrs in the yp case
- don't use __hostalias(), it is not thread-safe.

move the host file getbyname and getbyaddr functions to sethostent.c so
that they are in a separate file from the dns ones in order for libhack
to use them.

get rid of bogus + 1

fix gethostbyaddr prototype per TOG.

appease lint.

Add not advertised reentrant functions: {get,set,end}hostent_r,
gethostbyname{,2}_r, gethostbyaddr_r. Make getnameinfo(3) use
gethostbyaddr_r(3) so it is re-entrant (ahem __ypdomain). These
are not being advertised because there is a bunch of different
implementation of them that have a variety of type signatures.

If people want to follow someone's implementation, it is now easy.

branches: 1.79.2;
implement no-check-names

PR/45989: Martin Husemann: lint invocation does include -w only on i386

- turn lint -w for all the platforms after fixing the lint warnings.
- add _DIAGASSERTS() for casts that would assign values to types that
would not fit.
- change types, add casts
- change into ansii prototypes
- turn on _DIAGNOSTIC for libc (during current, to be eliminated for release
builds)

approved by core@

branches: 1.77.2; 1.77.4;
close on exec fixes:
- open + fcntl -> open O_CLOEXEC
- configuration database file descriptors that can stay open are now opened
fopen(db, "re")

dprintf is claimed by posix.

Revert a -> an changes: Adding an 'n' follows pronunciation, not writing.

fix grammar: a -> an

branches: 1.73.18;
Appropriate versions are not supplied by bind anymore.

merge in resolver portion of bind-9.4.0-rc2

branches: 1.71.2; 1.71.4;
fix incomplete initializers

Coverity CID 2279: Plug memory leak.

Coverity CID 2280: Plug memory leak.

PR/32616: Yves-Emmanuel JUTARD: Fix compilation with -DDEBUG

Rest of fix for PR#31184: getaddrinfo() now honors resolv.conf sortlist
directive for dns answers.

Also, unifdef the RESLVSORT (non-)option sillyness.

Reviewed by christos.

Re-enable resolv.conf sortlist support in gethostbyname().

Fixes first part of PR#31184. addrsort() was not exposed to the rest of
libc as it turns out not to be usable for getaddrinfo(), so a different
sorter will be implemented for that.

appease gcc -Wuninitialized

Fix gethostent(3) (which was reenabled in rev 1.63) so that it actually
works by allowing _gethtent() to treat host.h_addrtype==0 && host.h_length==0
as "any address family" when parsing.

Restore gethostent() as a supported interface. Yes, it maybe obsolete
but it is specified by IEEE Std 1003.1, 2004 Edition (POSIX) and
the X/Open standards (Issue 6 and XNS 5.2).

* revert change removing gethostent() from gethostbyname(3) man page
* delete kruft from gethnamaddr.c leaving only gethostent() as a
wrapper around _gethtent().
* revert recent changes to <netdb.h>
+ restore gethostent() prototype
+ restore freehostent() prototype; handle similar to non-shipped
getipnodby*() prototypes
+ use correct XOPEN_SOURCE version (520 not 500) for freeaddrinfo()
prototype; interface specified by XNS5.2 not XNS5

Reviewd by <christos> and <drochner>.

now that e.f.f.3.ip6.arpa is ready, we no longer need to query ip6.int

Change remaining K&R style function definition to ANSI; Reviewd by <christos>.

centralize res_*init() calls in __res_get_state()

Finish bind9 resolver merge.

branches: 1.58.2;
Back out rev. 1.56; `pointer points the byte just after the valid region'
is normal case. If the parser wants something more, there should be
another bounds check for it.

paren around macro arg

off-by-one. from millert@openbsd

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

Patches provided by Joel Baker in PR 22280, verified by myself.

bound copies

Fix signed/unsigned comparison warnings.

allocate 64K recieve buffer for DNS responses.

drop AAAA reply with IPv4 mapped address. sync w/kame
draft-itojun-v6ops-v4mapped-harmful-00.txt

set h_errno properly if internal string manipulation fails.

eliminate sprintf, use snprintf. check strlcat error.

query ip6.arpa then ip6.int for IPv6 reverse lookup. follows RFC3152.

correct DIAGASSERT

avoid remote buffer overrun on hostbuf[]. From: Joost Pol <joost@pine.nl>

correct bad practice in the code - it uses two changing variables
to manage buffer (buf and buflen). we eliminate buflen and use
fixed point (ep) as the ending pointer.

this fix is critical.

do not pass uninitialized variable to nsdispatch().

__STDC__ is always defined on NetBSD.

be picky about string manipulation in reverse lookups

branches: 1.42.2;
style

do not reverse-lookup scoped IPv6 address. it does not make sense as
there's no way to give scope identifier. sync w/kame

Change the `len' arguemtn to gethostbyaddr(3) from int to socklen_t in
accordance with XNS5.2; fixes PR standards/12703.

branches: 1.39.2;
remove redundant declarations.

Varargsify dprintf to allow for format string checking

on gethostby* with NIS backend, make a lookup against ipnodes.{byname,byaddr}
for non-IPv4 address. obeys solaris8 practice.

XXX does not support scoped address extension, as gethostby* are not
scope-aware. always use getaddrinfo/getnameinfo.
XXX it is not very useful at this moment, if you define multiple entries for
single hostname. see PR 10713 for detail.

plug host_addrs overrun. rogue NIS server can transmit tons of lines,
effectively overrun host_addrs buffer.

Passing "char" values to ctype(3) functions is problematic.
If an argument of a ctype function is outside "unsigned char"
and if it is not EOF, the behavior is undefined.

The isascii(3) is the sole exception of above and it was used to
be used to check a value was valid for other ctype functions in
ancient systems. On modern systems, the ctype functions take
all values of "unsigned char", and this check is obsolete and
even wrong for non-ASCII systems. However, we leave the isascii()
untouched for now, so as not to change the current behavior.

add CONSTCOND where appropriate

branches: 1.33.4;
Fix an alignment problem introduced by the patch for PR lib/8032.
Fixes PR lib/10048 by J.T. Conklin.

sync with BIND 4.9.7. strict boundary checking.

Try to silence some of the lint warnings. Unfortunately we cannot fix
them all right now until we fix the ALIGN() macro to return u_long in
all the ports.

Delint.

Delint.
Remove trailing ; from uses of __weak_alias(). The macro inserts this if
needed.

ignore KEY and SIG records when matching responses to the query. we
get those as extras from DNSsec-enabled name servers.

change default nsswitch.conf entry for `hosts' from:
hosts: dns files
to
hosts: files dns

this should speed things up a lot at boot if hostnames that are in
/etc/hosts are used for ifconfig, route, etc.

branches: 1.26.2;
back out the #ifdef _DIAGNOSTIC argument checks; too many people complained.
_DIAGASSERT() is still retained.

* use _DIAGASSERT() to check pointer arguments against NULL and file
descriptors against -1 (as appropriate).
* add actual checks which to detect stuff that would trigger_DIAGASSERT(),
and attempt to return a sane error condition.
* knf some code
* remove some `register' decls.

the first two items result in the addition of code similar to the
following in various functions:

_DIAGASSERT(path != NULL)
#ifdef _DIAGNOSTIC
if (path == NULL) {
errno = EFAULT;
return (-1);
}
#endif

do not make reverse query against IPv6 unspecified, or loopback addresses.

From: ume@mahoroba.org

- make sure that host_addr is suitably aligned
- add appropriate casts
- take out & in from array; it is meaningless

Make sure that "h_addr_list" pointers are longword aligned because some
broken applications depend on it. Fixes PR lib/8032 by David K Brownlee.

fix name resolution problem when you have "hosts: files dns" on
/etc/nsswitch.conf.

This was because of two reasons:
- /etc/hosts lookup code damaged some of internal
state used by gethostbyname2().
- getaddrinfo() was not persistent enough against errors.

Sorry for the delay, and hope this fix all the following PRs
(I checked in my environment immitating those PRs and it worked for me)
PR: 7901, 7912, 7921

check address family on getting entries from /etc/hosts.

fix hardcoded T_A.
this fixes gethostbyname2(host, AF_INET6) to actually work.

As discussed on "tech-net@netbsd.org":
Enhance the file resolver to return all IP addresses of a host on a
call to gethostbyname().

Remove unused 'len' and the relevant gcc kludges.

Don't bother de-linting inside __GNUC__ ifdefs.

specifically include stdarg/varargs.h

branches: 1.14.2;
minor knf; don't exceed 80 columns ;)

add ARGSUSED

constify ns_dtab defs

convert to new nsdispatch(3). lookup defaults back to "dns files"

before each call to nsdispatch(), set h_errno to NETDB_INTERNAL, and only
change to NETDB_SUCCESS if nsdispatch() returns NS_SUCCESS. it is up to the
internal methods to change h_errno from NETDB_INTERNAL to a more appropriate
value when an error is detected.

pull nsswitch up to main branch
convert getnetby*() to nsswitch (from resolv.conf lookup)

delint

branches: 1.7.2;
(bcmp(), bcopy(), bzero()) -> (memcmp(), memcpy(), memset())

Since these files are shared with parts of the BIND-4 userland (outside libc),
do the internal symbol renaming dance only if inside the libc build environment.

Need internal names for gethostby{addr,name}().

$Id: -> Id: (to make hunting down other bad Ids easier).

Bring over changes where were mistakenly committed to gethostnamadr.c:

date: 1997/07/21 14:07:54; author: jtc; state: Exp; lines: +3 -2
If port provides __weak_alias(), provide an Standard C and POSIX pure
identifier namespace by renaming non standard functions and variables
such that they have a leading underscore. The library will use those
names internally. Weak aliases are used to provide the original names
to the API.

This is only the first part of this change. It is most of the functions
which are implemented in C for all NetBSD ports. Subsequent changes are
to add the same support to the remaining C files, to assembly files, and
to the automagically generated assembly source used for system calls.
When all of the above is done, ports with weak alias support should add
a definition for __weak_alias to <sys/cdefs.h>.

merge bind 4.9.6 resolver. still need to fix <resolv.h>

branches: 1.1.1;
Initial revision