97 lines
2.5 KiB
Groff
97 lines
2.5 KiB
Groff
.\" $OpenBSD: resolvd.8,v 1.12 2023/02/21 07:47:24 jmc Exp $
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.\"
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.\" Copyright (c) 2021 Florian Obser <florian@openbsd.org>
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.\"
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.\" Permission to use, copy, modify, and distribute this software for any
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.\" purpose with or without fee is hereby granted, provided that the above
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.\" copyright notice and this permission notice appear in all copies.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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.\"
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.Dd $Mdocdate: February 21 2023 $
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.Dt RESOLVD 8
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.Os
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.Sh NAME
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.Nm resolvd
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.Nd a daemon to handle nameserver configuration
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.Sh SYNOPSIS
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.Nm
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.Op Fl dv
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.Sh DESCRIPTION
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.Nm
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handles the contents of
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.Pa /etc/resolv.conf ,
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which contains details of the system's DNS nameservers, and is
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read by the resolver routines in the C library.
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Nameservers are learned from various sources, incorporated in a priority
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order, then user-edited information found in the pre-existing file is
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re-appended.
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.Pp
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.Nm
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checks whether
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.Xr unwind 8
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is running and, if so, places a nameserver line at the top
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to cause local resolution:
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.Pp
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.Dl nameserver 127.0.0.1
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.Pp
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.Nm
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also monitors the routing socket for proposals learned by
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.Xr dhcpleased 8 ,
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.Xr iked 8 ,
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.Xr slaacd 8 ,
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or network devices which natively learn DNS information such as
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.Xr sppp 4
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or
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.Xr umb 4 .
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Proposals can be sent manually using the
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.Xr route 8
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.Cm nameserver
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command.
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The proposals are added in priority order,
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but commented out if
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.Xr unwind 8
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is running.
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.Pp
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After that,
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.Nm
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appends all user-edited lines found in the file.
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.Pp
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.Nm
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also notices if the
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.Pa /etc/resolv.conf
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file is edited, and will rewrite the file, re-blending the various
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pieces of information.
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It will also create
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.Pa /etc/resolv.conf
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if it does not exist or if it is empty.
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.Pp
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The options are as follows:
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.Bl -tag -width Ds
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.It Fl d
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Do not daemonize.
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If this option is specified,
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.Nm
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will run in the foreground and log to
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.Em stderr .
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.It Fl v
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Produce more verbose output.
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.El
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.Sh SEE ALSO
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.Xr resolv.conf 5 ,
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.Xr dhcpleased 8 ,
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.Xr route 8 ,
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.Xr slaacd 8 ,
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.Xr unwind 8
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.Sh HISTORY
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The
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.Nm
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program first appeared in
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.Ox 6.9 .
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