New proto script question -- how to daemonize the binary?

stangri · February 7, 2024, 5:34pm

I'm trying to create a protocol netifd script for netclient/netmaker. The binary which should be daemonized just creates a wg link, but I don't know how to daemonize (and then kill on proto_teardown) a binary from netifd script. Any suggestions?

stangri · February 19, 2024, 1:15am

Anyone? @jow?

jow · February 19, 2024, 7:24am

The appropriate functions to use are proto_add_command() and proto_kill_command() - see

github.com

openwrt/openwrt/blob/main/package/network/services/ppp/files/ppp.sh#L137


      
          
          	local lcp_failure="${keepalive%%[, ]*}"
          	local lcp_interval="${keepalive##*[, ]}"
          	local lcp_adaptive="lcp-echo-adaptive"
          	[ "${lcp_failure:-0}" -lt 1 ] && lcp_failure=""
          	[ "$lcp_interval" != "$keepalive" ] || lcp_interval=5
          	[ "${keepalive_adaptive:-1}" -lt 1 ] && lcp_adaptive=""
          	[ -n "$connect" ] || json_get_var connect connect
          	[ -n "$disconnect" ] || json_get_var disconnect disconnect
          
          	proto_run_command "$config" /usr/sbin/pppd \
          		nodetach ipparam "$config" \
          		ifname "$pppname" \
          		${localip:+$localip:} \
          		${lcp_failure:+lcp-echo-interval $lcp_interval lcp-echo-failure $lcp_failure $lcp_adaptive} \
          		${ipv6:++ipv6} \
          		${autoipv6:+set AUTOIPV6=1} \
          		${ip6table:+set IP6TABLE=$ip6table} \
          		${peerdns:+set PEERDNS=$peerdns} \
          		nodefaultroute \
          		usepeerdns \

and

github.com

openwrt/openwrt/blob/main/package/network/services/ppp/files/ppp.sh#L184


      
          			proto_notify_error "$interface" "$errorstring"
          			if [ "${authfail:-0}" -gt 0 ]; then
          				proto_block_restart "$interface"
          			fi
          		;;
          		*)
          			proto_notify_error "$interface" "$errorstring"
          		;;
          	esac
          
          	proto_kill_command "$interface"
          }
          
          # PPP on serial device
          
          proto_ppp_init_config() {
          	proto_config_add_string "device"
          	ppp_generic_init_config
          	no_device=1
          	available=1
          	lasterror=1

for real life examples. The first argument of both functions is the logical interface name, all subsequent arguments for proto_add_command() form the argument vector.

This requires that the invoked command stays in foreground and does not daemonize itself. When the called process terminates by itself (e.g. due to a crash), netifd will tear down the related interface. When an "ifdown ..." is issued for the related interface, netifd will terminate the related process.