[openwrt/openwrt] dnsmasq: add logfacility file to jail mounts

[LEDE Commits]

dangole pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/2b5fa44f60165d66d74131778df0b64b706887e2

commit 2b5fa44f60165d66d74131778df0b64b706887e2
Author: Daniel Golle <daniel at makrotopia.org>
AuthorDate: Mon Apr 25 18:56:52 2022 +0100

    dnsmasq: add logfacility file to jail mounts
    
    If logfacility is a path to a file it needs to be r/w mounted in the
    sandbox as well for dnsmasq to work.
    
    Reported-by: @iointerrupt
    Signed-off-by: Daniel Golle <daniel at makrotopia.org>
---
 package/network/services/dnsmasq/files/dnsmasq.init | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/package/network/services/dnsmasq/files/dnsmasq.init b/package/network/services/dnsmasq/files/dnsmasq.init
index d95502c0da..040ceaea2f 100755
--- a/package/network/services/dnsmasq/files/dnsmasq.init
+++ b/package/network/services/dnsmasq/files/dnsmasq.init
@@ -820,7 +820,7 @@ dnsmasq_ipset_add() {
 dnsmasq_start()
 {
 	local cfg="$1"
-	local disabled user_dhcpscript
+	local disabled user_dhcpscript logfacility
 	local resolvfile resolvdir localuse=0
 
 	config_get_bool disabled "$cfg" disabled 0
@@ -933,7 +933,7 @@ dnsmasq_start()
 	append_bool "$cfg" scriptarp "--script-arp"
 
 	append_parm "$cfg" logfacility "--log-facility"
-
+	config_get logfacility "$cfg" "logfacility"
 	append_parm "$cfg" cachesize "--cache-size"
 	append_parm "$cfg" dnsforwardmax "--dns-forward-max"
 	append_parm "$cfg" port "--port"
@@ -1167,6 +1167,10 @@ dnsmasq_start()
 	procd_add_jail_mount $dnsmasqconffile $dnsmasqconfdir $resolvdir $user_dhcpscript
 	procd_add_jail_mount /etc/passwd /etc/group /etc/TZ /etc/hosts /etc/ethers
 	procd_add_jail_mount_rw /var/run/dnsmasq/ $leasefile
+	case "$logfacility" in */*)
+		[ ! -e "$logfacility" ] && touch "$logfacility"
+		procd_add_jail_mount_rw "$logfacility"
+	esac
 
 	procd_close_instance
 }