From 9326593844e636dd589922b136bf2d1f07a2bad8 Mon Sep 17 00:00:00 2001
From: Jake Hillion <jake@hillion.co.uk>
Date: Thu, 25 Mar 2021 13:45:24 +0000
Subject: [PATCH] Added flags

---
 flags/flags.go        | 33 +++++++++++++++++++++++++++++++++
 flags/locs_freebsd.go |  4 ++++
 flags/locs_linux.go   |  4 ++++
 go.mod                |  1 +
 go.sum                |  7 ++++---
 5 files changed, 46 insertions(+), 3 deletions(-)
 create mode 100644 flags/flags.go
 create mode 100644 flags/locs_freebsd.go
 create mode 100644 flags/locs_linux.go

diff --git a/flags/flags.go b/flags/flags.go
new file mode 100644
index 0000000..52608e7
--- /dev/null
+++ b/flags/flags.go
@@ -0,0 +1,33 @@
+package flags
+
+import (
+	"fmt"
+	"github.com/jessevdk/go-flags"
+)
+
+type Options struct {
+	Config  string `short:"c" long:"config" description:"Configuration file location" value-name:"FILE"`
+	PidFile string `short:"p" long:"pid" description:"PID file location"`
+
+	InterfaceName string
+}
+
+func ParseFlags() (*Options, error) {
+	o := new(Options)
+	args, err := flags.Parse(o)
+	if err != nil {
+		return nil, err
+	}
+
+	if len(args) > 0 {
+		o.InterfaceName = args[0]
+		if o.Config == "" {
+			o.Config = fmt.Sprintf(DefaultConfigFile, o.InterfaceName)
+		}
+		if o.PidFile == "" {
+			o.PidFile = fmt.Sprintf(DefaultPidFile, o.InterfaceName)
+		}
+	}
+
+	return o, err
+}
diff --git a/flags/locs_freebsd.go b/flags/locs_freebsd.go
new file mode 100644
index 0000000..13bbda0
--- /dev/null
+++ b/flags/locs_freebsd.go
@@ -0,0 +1,4 @@
+package flags
+
+const DefaultConfigFile = "/usr/local/etc/netcombiner/%s"
+const DefaultPidFile = "/var/run/netcombiner/%s.pid"
diff --git a/flags/locs_linux.go b/flags/locs_linux.go
new file mode 100644
index 0000000..82a7f21
--- /dev/null
+++ b/flags/locs_linux.go
@@ -0,0 +1,4 @@
+package flags
+
+const DefaultConfigFile = "/etc/netcombiner/%s"
+const DefaultPidFile = "/var/run/netcombiner/%s.pid"
diff --git a/go.mod b/go.mod
index edfdcc1..1157795 100644
--- a/go.mod
+++ b/go.mod
@@ -5,6 +5,7 @@ go 1.15
 require (
 	github.com/JakeHillion/taptun v0.0.0-20210320133200-cf0ef75b1bff
 	github.com/go-playground/validator/v10 v10.4.1
+	github.com/jessevdk/go-flags v1.5.0
 	github.com/smartystreets/goconvey v1.6.4 // indirect
 	github.com/stretchr/testify v1.4.0
 	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9
diff --git a/go.sum b/go.sum
index cc4beb1..91065b9 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,3 @@
-github.com/JakeHillion/taptun v0.0.0-20160424131934-bbbd335672ab h1:/UB98lLA11PJZOqhdzqeITMTMz6eiTjti9Z9kYq1SWQ=
-github.com/JakeHillion/taptun v0.0.0-20160424131934-bbbd335672ab/go.mod h1:8WBFCKR7ZdT+WVtgyiSPJf6gqXiNZUvfglN8vwkoyBE=
 github.com/JakeHillion/taptun v0.0.0-20210320133200-cf0ef75b1bff h1:O+wiKpOHS2BidwDz6ZuR3dVQNsrD55raE9mY4yub6Wc=
 github.com/JakeHillion/taptun v0.0.0-20210320133200-cf0ef75b1bff/go.mod h1:8WBFCKR7ZdT+WVtgyiSPJf6gqXiNZUvfglN8vwkoyBE=
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
@@ -14,6 +12,8 @@ github.com/go-playground/validator/v10 v10.4.1 h1:pH2c5ADXtd66mxoE0Zm9SUhxE20r7a
 github.com/go-playground/validator/v10 v10.4.1/go.mod h1:nlOn6nFhuKACm19sB/8EGNn9GlaMV7XkbRSipzJ0Ii4=
 github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1 h1:EGx4pi6eqNxGaHF6qqu48+N2wcFQ5qg5FXgOdqsJ5d8=
 github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
+github.com/jessevdk/go-flags v1.5.0 h1:1jKYvbxEjfUl0fmqTCOfonvskHHXMjBySTLW4y9LFvc=
+github.com/jessevdk/go-flags v1.5.0/go.mod h1:Fw0T6WPc1dYxT4mKEZRfG5kJhaTDP9pj1c2EWnYs/m4=
 github.com/jtolds/gls v4.20.0+incompatible h1:xdiiI2gbIgH/gLH7ADydsJ1uDOEzR8yvV7C0MuV77Wo=
 github.com/jtolds/gls v4.20.0+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
 github.com/leodido/go-urn v1.2.0 h1:hpXL4XnriNwQ/ABnpepYM/1vCLWNDfUNts8dX3xTG6Y=
@@ -33,8 +33,9 @@ golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPh
 golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20190412213103-97732733099d h1:+R4KGOnez64A81RvjARKc4UT5/tI9ujCIVX+P5KiHuI=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210320140829-1e4c9ba3b0c4 h1:EZ2mChiOa8udjfp6rRmswTbtZN/QzUQp4ptM4rnjHvc=
+golang.org/x/sys v0.0.0-20210320140829-1e4c9ba3b0c4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=