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Document how to enable strict RFC 1034 enforcements.

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PR:		kern/129477
This commit is contained in:
Xin LI 2009-05-29 07:55:44 +00:00
parent a28076c8f7
commit 5512745e3a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=193024
1 changed files with 14 additions and 1 deletions
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15
lib/libc/net/resolver.3
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@ -28,7 +28,7 @@
.\" @(#)resolver.3 8.1 (Berkeley) 6/4/93
.\" $FreeBSD$
.\"
.Dd November 4, 2006
.Dd May 29, 2009
.Dt RESOLVER 3
.Os
.Sh NAME
@ -401,6 +401,19 @@ function properly if the programmer attempts to declare his or her own
.Va _res
structure in an attempt to replace the per-thread version referred to
by that macro.
.Pp
The following compile-time option can be specified to change the default
behavior of resolver routines when necessary.
.Bl -tag -width RES_ENFORCE_RFC1034
.It Dv RES_ENFORCE_RFC1034
If this symbol is defined during compile-time,
.Fn res_search
will enforce RFC 1034 check, namely, disallow using of underscore character
within host names.
This is used by the standard host lookup routines like
.Xr gethostbyname 3 .
For compatibility reasons this option is not enabled by default.
.El
.Sh RETURN VALUES
The
.Fn res_init