1.\" $OpenBSD: resolvd.8,v 1.9 2021/11/11 05:52:03 bket Exp $ 2.\" 3.\" Copyright (c) 2021 Florian Obser <florian@openbsd.org> 4.\" 5.\" Permission to use, copy, modify, and distribute this software for any 6.\" purpose with or without fee is hereby granted, provided that the above 7.\" copyright notice and this permission notice appear in all copies. 8.\" 9.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16.\" 17.Dd $Mdocdate: November 11 2021 $ 18.Dt RESOLVD 8 19.Os 20.Sh NAME 21.Nm resolvd 22.Nd a daemon to handle nameserver configuration 23.Sh SYNOPSIS 24.Nm 25.Op Fl dv 26.Sh DESCRIPTION 27.Nm 28handles the contents of 29.Pa /etc/resolv.conf , 30which contains details of the system's DNS nameservers, and is 31read by the resolver routines in the C library. 32Nameservers are learned from various sources, incorporated in a priority 33order, then user-edited information found in the pre-existing file is 34re-appended. 35.Pp 36.Nm 37checks whether 38.Xr unwind 8 39is running, and if so places 40.Pp 41.Dl nameserver 127.0.0.1 42.Pp 43at the top, to cause local resolution. 44.Pp 45.Nm 46also monitors the routing socket for proposals learned by 47.Xr dhclient 8 , 48.Xr dhcpleased 8 , 49.Xr slaacd 8 , 50or network devices which natively learn DNS information such as 51.Xr sppp 4 52or 53.Xr umb 4 . 54Proposals can also be sent using the 55.Xr route 8 56.Cm nameserver 57command. 58.Pp 59These proposals are added in priority order, but commented out 60if 61.Xr unwind 8 62is running. 63.Pp 64After that, 65.Nm 66appends all user-edited lines found in the file. 67.Pp 68.Nm 69also notices if the 70.Pa /etc/resolv.conf 71file is edited, and will rewrite the file, re-blending the various 72pieces of information. 73It will also create 74.Pa /etc/resolv.conf 75if it does not exist or if it is empty. 76.Pp 77The options are as follows: 78.Bl -tag -width Ds 79.It Fl d 80Do not daemonize. 81If this option is specified, 82.Nm 83will run in the foreground and log to 84.Em stderr . 85.It Fl v 86Produce more verbose output. 87.El 88.Sh SEE ALSO 89.Xr resolv.conf 5 , 90.Xr dhclient 8 , 91.Xr dhcpleased 8 , 92.Xr route 8 , 93.Xr slaacd 8 , 94.Xr unwind 8 95.Sh HISTORY 96The 97.Nm 98program first appeared in 99.Ox 6.9 . 100