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dnsmasq: distinct Ubus names for multiple instances 

Currently, when using multiple dnsmasq instances they are all assigned
to the same Ubus instance name. This does not work, as only a single
instance can register with Ubus at a time. In the log, this leads to
`Cannot add object to UBus: Invalid argument` error messages.
Furthermore, upstream 3c93e8eb41952a9c91699386132d6fe83050e9be changes
behaviour so that instead of the log, dnsmasq exits at start instead.

With this patch, all dnsmasq instances are assigned unique names so that
they can register with Ubus concurrently. One of the enabled instances
is always assigned the previous default name "dnsmasq" to avoid breaking
backwards compatibility with other software relying on that default.
Previously, a random instance got assigned that name (while the others
produced error logs). Now, the first unnamed dnsmasq config section is
assigned the default name. If there are no unnamed dnsmasq sections the
first encountered named dnsmasq config section is assigned instead.

A similar issue exists for Dbus and was similarly addressed.

Signed-off-by: Etan Kissling <etan.kissling@gmail.com>
[tweaked commit message] dnsmasq was not crashing it is exiting
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
This commit is contained in:
Etan Kissling 2021-06-27 22:02:46 +00:00 committed by Kevin Darbyshire-Bryant
parent e8b5429609
commit ba5bd8e556
1 changed files with 29 additions and 3 deletions
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32
package/network/services/dnsmasq/files/dnsmasq.init
View File

@ -161,7 +161,7 @@ append_server() {
}
append_rev_server() {
xappend "--rev-server=$1"
xappend "--rev-server=$1"
}
append_address() {
@ -878,8 +878,16 @@ dnsmasq_start()
append_bool "$cfg" noresolv "--no-resolv"
append_bool "$cfg" localise_queries "--localise-queries"
append_bool "$cfg" readethers "--read-ethers"
append_bool "$cfg" dbus "--enable-dbus"
append_bool "$cfg" ubus "--enable-ubus" 1
local instance_name="dnsmasq.$cfg"
if [ "$cfg" = "$DEFAULT_INSTANCE" ]; then
instance_name="dnsmasq"
fi
config_get_bool dbus "$cfg" "dbus" 0
[ $dbus -gt 0 ] && xappend "--enable-dbus=uk.org.thekelleys.$instance_name"
config_get_bool ubus "$cfg" "ubus" 1
[ $ubus -gt 0 ] && xappend "--enable-ubus=$instance_name"
append_bool "$cfg" expandhosts "--expand-hosts"
config_get tftp_root "$cfg" "tftp_root"
[ -n "$tftp_root" ] && mkdir -p "$tftp_root" && append_bool "$cfg" enable_tftp "--enable-tftp"
@ -1160,6 +1168,7 @@ boot()
start_service() {
local instance="$1"
local instance_found=0
local first_instance=""
. /lib/functions/network.sh
@ -1170,10 +1179,27 @@ start_service() {
if [ -n "$instance" ] && [ "$instance" = "$name" ]; then
instance_found=1
fi
if [ -z "$DEFAULT_INSTANCE" ]; then
local disabled
config_get_bool disabled "$name" disabled 0
if [ "$disabled" -eq 0 ]; then
# First enabled section will be assigned default instance name.
# Unnamed sections get precedence over named sections.
if expr "$cfg" : 'cfg[0-9a-f]*$' >/dev/null = "9"; then # See uci_fixup_section.
DEFAULT_INSTANCE="$name" # Unnamed config section.
elif [ -z "$first_instance" ]; then
first_instance="$name"
fi
fi
fi
fi
}
DEFAULT_INSTANCE=""
config_load dhcp
if [ -z "$DEFAULT_INSTANCE" ]; then
DEFAULT_INSTANCE="$first_instance" # No unnamed config section was found.
fi
if [ -n "$instance" ]; then
[ "$instance_found" -gt 0 ] || return