From c29500c7b461603790126f7591fcb6dc3b9634e7 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Fri, 16 Jul 2021 17:27:59 +0200
Subject: [dhcpc-busybox] Add option to ignore secondary interfaces, improve

.... resolv.conf awk generator
---
 .../data/etc/systemd/system/udhcpc@.service        |  7 +-
 .../data/opt/openslx/scripts/systemd-udhcpc        | 34 +++++++++
 .../data/opt/openslx/scripts/systemd-udhcpc++      | 34 ---------
 .../data/opt/openslx/scripts/udhcpc-openslx        | 85 ++++++++++++----------
 4 files changed, 84 insertions(+), 76 deletions(-)
 create mode 100755 core/modules/dhcpc-busybox/data/opt/openslx/scripts/systemd-udhcpc
 delete mode 100755 core/modules/dhcpc-busybox/data/opt/openslx/scripts/systemd-udhcpc++

(limited to 'core/modules/dhcpc-busybox/data')

diff --git a/core/modules/dhcpc-busybox/data/etc/systemd/system/udhcpc@.service b/core/modules/dhcpc-busybox/data/etc/systemd/system/udhcpc@.service
index d797dd4b..cfab7923 100644
--- a/core/modules/dhcpc-busybox/data/etc/systemd/system/udhcpc@.service
+++ b/core/modules/dhcpc-busybox/data/etc/systemd/system/udhcpc@.service
@@ -3,8 +3,7 @@ Description=DHCP Client for %i
 After=systemd-tmpfiles-setup.service
 
 [Service]
-Type=forking
-PIDFile=/run/udhcpc/udhcpc.%i.pid
-ExecStart=/opt/openslx/scripts/systemd-udhcpc++ %i
-ExecStopPost=/opt/openslx/bin/rm /run/udhcpc/udhcpc.%i.pid
+Type=simple
+ExecStart=/opt/openslx/scripts/systemd-udhcpc %i
+Restart=on-failure
 
diff --git a/core/modules/dhcpc-busybox/data/opt/openslx/scripts/systemd-udhcpc b/core/modules/dhcpc-busybox/data/opt/openslx/scripts/systemd-udhcpc
new file mode 100755
index 00000000..49d0180d
--- /dev/null
+++ b/core/modules/dhcpc-busybox/data/opt/openslx/scripts/systemd-udhcpc
@@ -0,0 +1,34 @@
+#!/bin/bash
+# For arrays
+
+net_if="$1"
+net_ip="$(ip addr show dev "${net_if}" | grep -m1 '^\s*inet ' | awk -F " " '{print $2}' | awk -F "/" '{print $1}')"
+
+declare -a udhcpc_opts
+if [ -n "$net_ip" ]; then
+	udhcpc_opts+=( "-r" "$net_ip" )
+fi
+
+. /opt/openslx/config
+primary="${SLX_BRIDGE:-br0}"
+
+if [ "${SLX_DHCP_SECONDARY:-yes}" != "yes" ]; then
+	echo "No DHCP on other NICs requested. Doing nothing."
+	exit 0
+fi
+
+if [ "$primary" = "$net_if" ] && [ "$SLX_NET_DHCP_UUID" = "yes" ]; then
+	uid="$( dmidecode -s system-uuid | sed -r 's/^(..)(..)(..)(..)-(..)(..)-(..)(..)-(....)-/00\4\3\2\1\6\5\8\7\9/' )"
+	if [ "${#uid}" = 34 ]; then
+		echo "Using SMBIOS uid for DHCP"
+		udhcpc_opts+=( "-x" "0x3d:$uid" )
+	fi
+fi
+
+exec /opt/openslx/sbin/udhcpc "${udhcpc_opts[@]}" \
+	-O domain -O nissrv -O nisdomain -O wpad -O search -O wins \
+	-s /opt/openslx/scripts/udhcpc-openslx \
+	-i "${net_if}" -f -t 8
+
+slxlog "udhcpc" "Could not run 'udhcpc ${udhcpc_opts[*]}' on ${net_if}."
+exit 1
diff --git a/core/modules/dhcpc-busybox/data/opt/openslx/scripts/systemd-udhcpc++ b/core/modules/dhcpc-busybox/data/opt/openslx/scripts/systemd-udhcpc++
deleted file mode 100755
index 7d7dfc68..00000000
--- a/core/modules/dhcpc-busybox/data/opt/openslx/scripts/systemd-udhcpc++
+++ /dev/null
@@ -1,34 +0,0 @@
-#!/bin/bash
-# For arrays
-
-net_if="$1"
-net_ip="$(ip addr show dev "${net_if}" | grep -m1 '^\s*inet ' | awk -F " " '{print $2}' | awk -F "/" '{print $1}')"
-
-declare -a udhcpc_opts
-if [ -n "$net_ip" ]; then
-	udhcpc_opts+=( "-r" "$net_ip" )
-fi
-
-. /opt/openslx/config
-primary="br0"
-[ -n "$SLX_BRIDGE" ] && primary="$SLX_BRIDGE"
-
-if [ "$primary" = "$net_if" ] && [ "$SLX_NET_DHCP_UUID" = "yes" ]; then
-	uid=$(dmidecode -s system-uuid | sed -r 's/^(..)(..)(..)(..)-(..)(..)-(..)(..)-(....)-/00\4\3\2\1\6\5\8\7\9/')
-	if [ "${#uid}" = 34 ]; then
-		echo "Using SMBIOS uid for DHCP"
-		udhcpc_opts+=( "-x" "0x3d:$uid" )
-	fi
-fi
-
-mkdir -p /run/udhcpc || echo "Could not create '/run/udhcpc'."
-
-/opt/openslx/sbin/udhcpc "${udhcpc_opts[@]}" -O domain -O nissrv -O nisdomain -O wpad -O search -O wins -t 8 -s /opt/openslx/scripts/udhcpc-openslx -i "${net_if}" -p "/run/udhcpc/udhcpc.${net_if}.pid"
-ret=$?
-
-if [ "${ret}" != 0 ]; then
-	slxlog "udhcpc" "Could not run 'udhcpc ${udhcpc_opts[*]}' on ${net_if}."
-fi
-
-exit "${ret}"
-
diff --git a/core/modules/dhcpc-busybox/data/opt/openslx/scripts/udhcpc-openslx b/core/modules/dhcpc-busybox/data/opt/openslx/scripts/udhcpc-openslx
index c034efb5..3a35dccb 100755
--- a/core/modules/dhcpc-busybox/data/opt/openslx/scripts/udhcpc-openslx
+++ b/core/modules/dhcpc-busybox/data/opt/openslx/scripts/udhcpc-openslx
@@ -20,33 +20,55 @@
 
 . /opt/openslx/config
 
-primary="br0"
-[ -n "$SLX_BRIDGE" ] && primary="$SLX_BRIDGE"
+declare -rg primary="${SLX_BRIDGE:-br0}"
 
-RESOLV_CONF="/opt/openslx/resolv.conf"
-THIS_RESOLV="/run/network/${interface}.resolv"
+declare -rg RESOLV_CONF="/opt/openslx/resolv.conf"
+declare -rg THIS_RESOLV="/run/network/${interface}.resolv"
 
 rebuild_resolv_conf () {
 	# Don't do anything if the active resolv.conf is not ours
 	# Also this will not run resolvconf update.d... No idea if we should still do so...
 	[ -L "/etc/resolv.conf" ] || return 0
-	[ "x$(readlink "/etc/resolv.conf")" == "x${RESOLV_CONF}" ] || return 0
-	# Maybe make this smarter some time, if anyone is using clients that are on multiple networks at once etc...
-	# This is a little braindead but should work most of the time
-	# See man resolv.conf -> only the last "search" line is valid, thus we merge them
-	sort -u /run/network/*.resolv \
+	[ "$(readlink -f "/etc/resolv.conf")" = "${RESOLV_CONF}" ] || return 0
+	# Use extglob trickery to make sure br0/$primary stuff comes first
+	shopt -s extglob
+	# Then print them in a first-come-first-served manner.
+	# Print nameserver entries one per line, print only first domain value,
+	# group everything else together into one line.
+	# Skip domain entirely if any search lines are found.
+	cat "/tmp/$primary.resolv" /tmp/!("$primary").resolv \
 		| awk '{
-			if ( $1 == "search" )
-				search[++idx] = $2
-			else
+			if ( $1 ~ /^[a-z]+$/ ) {
+				for (i = 2; i <= NF; ++i) {
+					if (done[$1][$i])
+						continue
+					done[$1][$i] = 1
+					output[$1][++idx] = $i
+				}
+			} else {
 				print $0
 			}
-			END {
-				printf "%s", "search"
-				for (s in search)
-					printf " %s", search[s]
-			}' \
+		}
+		END {
+			for (s in output) {
+				if (s == "nameserver") {
+					for (t in output[s]) {
+						print s " " output[s][t]
+					}
+				} else if (s == "domain" && isarray(output["search"])) {
+				} else {
+					printf "%s", s
+					for (t in output[s]) {
+						printf " %s", output[s][t]
+						if (s == "domain")
+							break
+					}
+					print ""
+				}
+			}
+		}' \
 		> "$RESOLV_CONF" 2> /dev/null
+	shopt -u extglob
 
 	# add support for resolv.conf update scripts // see man(8) resolvconf
 	for s in /etc/resolvconf/update.d/*.sh; do
@@ -55,11 +77,11 @@ rebuild_resolv_conf () {
 }
 
 escape_search() {
-	echo "$@" | sed -e 's/[]\/()$*.^|[]/\\&/g'
+	sed -e 's/[]\/()$*.^|[]/\\&/g' <<<"$@"
 }
 
 escape_replace() {
-	echo "$@" | sed -e 's/[\/&]/\\&/g'
+	sed -e 's/[\/&]/\\&/g' <<<"$@"
 }
 
 check_env() {
@@ -143,17 +165,9 @@ case "$1" in
 			echo "nameserver $i" >> "${conf_file}"
 		done
 		
-		if [ -x "/sbin/resolvconf" ] && [ -L "/etc/resolv.conf" ] && [ -d "/etc/resolvconf/update.d" ]; then
-			# Automatic handling :-)
-			resolvconf --create-runtime-directories
-			resolvconf --enable-updates
-			< "$conf_file"  resolvconf -a "${interface}.udhcpc"
-			rm -- "$conf_file"
-		else
-			# Manual handling required :-(
-			mv -f "$conf_file" "$THIS_RESOLV"
-			rebuild_resolv_conf
-		fi
+		# Manual handling required :-(
+		mv -f "$conf_file" "$THIS_RESOLV"
+		rebuild_resolv_conf
 
 		
 		# Things that should only happen for the main interface that was used for booting
@@ -265,14 +279,9 @@ case "$1" in
 			sed -i "/^$(escape_search "$ip")(\s|$)/d" /etc/hosts
 		fi
 		
-		if [ -x /sbin/resolvconf ] && [ -L /etc/resolv.conf ] && [ -d /etc/resolvconf/update.d ]; then
-			# Automatic handling :-)
-			resolvconf -d "${interface}.udhcpc"
-		else
-			# Manual handling required :-(
-			rm -f -- "$THIS_RESOLV"
-			rebuild_resolv_conf
-		fi
+		# Manual handling required :-(
+		rm -f -- "$THIS_RESOLV"
+		rebuild_resolv_conf
 	;;
 	
 	leasefail)
-- 
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