1.\" $OpenBSD: resolvd.8,v 1.12 2023/02/21 07:47:24 jmc 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: February 21 2023 $ 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 a nameserver line at the top 40to cause local resolution: 41.Pp 42.Dl nameserver 127.0.0.1 43.Pp 44.Nm 45also monitors the routing socket for proposals learned by 46.Xr dhcpleased 8 , 47.Xr iked 8 , 48.Xr slaacd 8 , 49or network devices which natively learn DNS information such as 50.Xr sppp 4 51or 52.Xr umb 4 . 53Proposals can be sent manually using the 54.Xr route 8 55.Cm nameserver 56command. 57The proposals are added in priority order, 58but commented out if 59.Xr unwind 8 60is running. 61.Pp 62After that, 63.Nm 64appends all user-edited lines found in the file. 65.Pp 66.Nm 67also notices if the 68.Pa /etc/resolv.conf 69file is edited, and will rewrite the file, re-blending the various 70pieces of information. 71It will also create 72.Pa /etc/resolv.conf 73if it does not exist or if it is empty. 74.Pp 75The options are as follows: 76.Bl -tag -width Ds 77.It Fl d 78Do not daemonize. 79If this option is specified, 80.Nm 81will run in the foreground and log to 82.Em stderr . 83.It Fl v 84Produce more verbose output. 85.El 86.Sh SEE ALSO 87.Xr resolv.conf 5 , 88.Xr dhcpleased 8 , 89.Xr route 8 , 90.Xr slaacd 8 , 91.Xr unwind 8 92.Sh HISTORY 93The 94.Nm 95program first appeared in 96.Ox 6.9 . 97