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e739f41d05
resolvconf -p resolvconf: Error: Command not recognized Signed-off-by: Sergio E. Nemirowski <sergio@outerface.net> Acked-by: David Sommerseth <davids@openvpn.net> Message-Id: <20210529013516.767555-1-sergio@outerface.net> URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg22467.html Signed-off-by: Gert Doering <gert@greenie.muc.de>
105 lines
2.9 KiB
Bash
105 lines
2.9 KiB
Bash
#!/bin/sh
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# Copyright (c) 2005-2018 OpenVPN Inc
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# Licensed under the GPL version 2
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# First version by Jesse Adelman
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# someone at boldandbusted dink com
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# http://www.boldandbusted.com/
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# PURPOSE: This script automatically sets the proper /etc/resolv.conf entries
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# as pulled down from an OpenVPN server.
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# INSTALL NOTES:
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# Place this in /etc/openvpn/client.up
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# Then, add the following to your /etc/openvpn/<clientconfig>.conf:
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# client
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# up /etc/openvpn/client.up
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# Next, "chmod a+x /etc/openvpn/client.up"
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# USAGE NOTES:
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# Note that this script is best served with the companion "client.down"
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# script.
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# Tested under Debian lenny with OpenVPN 2.1_rc11
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# It should work with any UNIX with a POSIX sh, /etc/resolv.conf or resolvconf
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# This runs with the context of the OpenVPN UID/GID
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# at the time of execution. This generally means that
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# the client "up" script will run fine, but the "down" script
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# will require the use of the OpenVPN "down-root" plugin
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# which is in the plugins/ directory of the OpenVPN source tree
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# A horrid work around, from a security perspective,
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# is to run OpenVPN as root. THIS IS NOT RECOMMENDED. You have
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# been WARNED.
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PATH=/bin:/usr/bin:/usr/local/bin:/sbin:/usr/sbin:/usr/local/sbin
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# init variables
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i=1
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domains=
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fopt=
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ndoms=0
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nns=0
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nl='
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'
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# $foreign_option_<n> is something like
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# "dhcp-option DOMAIN example.com" (multiple allowed)
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# or
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# "dhcp-option DNS 10.10.10.10" (multiple allowed)
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# each DNS option becomes a "nameserver" option in resolv.conf
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# if we get one DOMAIN, that becomes "domain" in resolv.conf
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# if we get multiple DOMAINS, those become "search" lines in resolv.conf
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# if we get no DOMAINS, then don't use either domain or search.
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while true; do
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eval fopt=\$foreign_option_${i}
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[ -z "${fopt}" ] && break
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case ${fopt} in
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dhcp-option\ DOMAIN\ *)
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ndoms=$((ndoms + 1))
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domains="${domains} ${fopt#dhcp-option DOMAIN }"
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;;
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dhcp-option\ DNS\ *)
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nns=$((nns + 1))
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if [ $nns -le 3 ]; then
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dns="${dns}${dns:+$nl}nameserver ${fopt#dhcp-option DNS }"
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else
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printf "%s\n" "Too many nameservers - ignoring after third" >&2
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fi
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;;
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*)
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printf "%s\n" "Unknown option \"${fopt}\" - ignored" >&2
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;;
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esac
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i=$((i + 1))
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done
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ds=""
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if [ $ndoms -eq 1 ]; then
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ds="${nl}domain"
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elif [ $ndoms -gt 1 ]; then
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ds="${nl}search"
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fi
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# This is the complete file - "$domains" has a leading space already
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out="# resolv.conf autogenerated by ${0} (${dev})${nl}${dns}${ds}${domains}"
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# use resolvconf if it's available
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if type resolvconf >/dev/null 2>&1; then
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printf "%s\n" "${out}" | resolvconf -a "${dev}"
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else
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# Preserve the existing resolv.conf
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if [ -e /etc/resolv.conf ] ; then
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cp /etc/resolv.conf /etc/resolv.conf.ovpnsave
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fi
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printf "%s\n" "${out}" > /etc/resolv.conf
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chmod 644 /etc/resolv.conf
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fi
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exit 0
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