sysutils/egress-monitor: Add new port

Add sysutils/egress-monitor, a tool that is watching for default routes
changes and sets the interface group. When the default route is added,
egress-monitor sets the group of that interface to appropriate egress.

WWW: https://github.com/mekanix/egress-monitor

PR:		267731
Tested by:	dfr

sysutils/Makefile

@@ -335,6 +335,7 @@
     SUBDIR += eclat
     SUBDIR += edid-decode
     SUBDIR += edk2
+    SUBDIR += egress-monitor
     SUBDIR += eject
     SUBDIR += eksctl
     SUBDIR += endian

sysutils/egress-monitor/Makefile

@@ -0,0 +1,22 @@
+PORTNAME=	egress-monitor
+DISTVERSION=	0.0.3
+CATEGORIES=	sysutils
+
+MAINTAINER=	meka@tilda.center
+COMMENT=	Set network interface groups based on default routes
+WWW=		https://github.com/mekanix/egress-monitor
+
+LICENSE=	BSD2CLAUSE
+LICENSE_FILE=	${WRKSRC}/LICENSE
+
+USES=		uidfix
+USE_RC_SUBR=	egress-monitor
+SUB_FILES=	pkg-message
+
+USE_GITHUB=	yes
+GH_ACCOUNT=	mekanix
+
+PLIST_FILES=	man/man1/egress-monitor.1.gz \
+		sbin/egress-monitor
+
+.include <bsd.port.mk>

sysutils/egress-monitor/distinfo

@@ -0,0 +1,3 @@
+TIMESTAMP = 1668281396
+SHA256 (mekanix-egress-monitor-0.0.3_GH0.tar.gz) = 74302e0fea9be384d791d7610c85a783696f71ab2ca005e98e590d14b12e1da5
+SIZE (mekanix-egress-monitor-0.0.3_GH0.tar.gz) = 4937

sysutils/egress-monitor/files/egress-monitor.in

@@ -0,0 +1,22 @@
+#!/bin/sh
+
+# PROVIDE: egress-monitor
+# KEYWORD: shutdown
+# REQUIRE: NETWORKING
+# BEFORE: pf
+
+. /etc/rc.subr
+
+name=egress_monitor
+desc="default route monitor"
+rcvar=${name}_enable
+load_rc_config $name
+
+: ${egress_monitor_enable:="NO"}
+
+procname="%%PREFIX%%/sbin/egress-monitor"
+command="/usr/sbin/daemon"
+command_args="-S -T ${name} ${procname}"
+
+run_rc_command $*
+

sysutils/egress-monitor/files/pkg-message.in

@@ -0,0 +1,8 @@
+[
+{ type: install
+  message: <<EOM
+Please note that egress-monitor will not pick up changes in net.fibs sysctl, so
+if you change it, you have to "service egress-monitor restart".
+EOM
+}
+]

sysutils/egress-monitor/pkg-descr

@@ -0,0 +1,4 @@
+Watching for default routes changes and sets the interface group. When the
+default route is added, egress-monitor sets the group of that interface to
+appropriate egress. That means for IPv4 and FIB 0 (default one) the group will
+be v4fib0egress. In general, the group name is v<4|6>fib<number>egress.