From a436db03ce64edbe3e9750bcb5dee6737e55c427 Mon Sep 17 00:00:00 2001
From: Matthias Kruk <m@m10k.eu>
Date: Mon, 22 Mar 2021 09:48:39 +0900
Subject: [PATCH] include/iface: Add module for querying network interfaces

This commit adds a module that allows the user to query the state of
wired and wireless network interfaces.
---
 include/iface.sh | 113 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 include/iface.sh

diff --git a/include/iface.sh b/include/iface.sh
new file mode 100644
index 0000000..a71ae29
--- /dev/null
+++ b/include/iface.sh
@@ -0,0 +1,113 @@
+#!/bin/bash
+
+__init() {
+	return 0
+}
+
+iface_exists() {
+	local iface
+
+	iface="$1"
+
+	if grep -F "$iface" < /proc/net/dev &> /dev/null; then
+		return 0
+	fi
+
+	return 1
+}
+
+iface_get_state() {
+	local iface
+	local state
+
+	iface="$1"
+
+	if ! state=$(ip link show "$iface" 2>/dev/null); then
+		return 1
+	fi
+
+	if ! state=$(echo "$state" | grep -oP "state[ ]+\K[^ ]+"); then
+		return 1
+	fi
+
+	case "$state" in
+		"UP")
+			echo "1"
+			;;
+
+		"DOWN")
+			echo "0"
+			;;
+
+		*)
+			return 1
+			;;
+	esac
+
+	return 0
+}
+
+iface_set_state() {
+	local iface
+	local state
+
+	iface="$1"
+	state="$2"
+
+	case "$state" in
+		"0")
+			state="down"
+			;;
+
+		"1")
+			state="up"
+			;;
+
+		*)
+			return 1
+			;;
+	esac
+
+	if ! /sbin/ifconfig "$iface" "$state" &>/dev/null; then
+		return 1
+	fi
+
+	return 0
+}
+
+iface_get_address() {
+        local iface
+        local proto
+
+        local addr_all
+
+        iface="$1"
+        proto="$2"
+
+        if ! addr_all=$(ip address show dev "$iface"); then
+                return 1
+        fi
+
+        if ! echo "$addr_all" | grep -oP "$proto[ \t]+\K[^ ]+"; then
+                return 1
+        fi
+
+        return 0
+}
+
+iface_get_essid() {
+        local iface
+        local addr_all
+
+        iface="$1"
+
+        if ! addr_all=$(/sbin/iwconfig 2>&1); then
+                return 1
+        fi
+
+        if ! echo "$addr_all" | grep -oP "$iface.*ESSID:\"\K[^\"]+"; then
+                return 1
+        fi
+
+        return 0
+}
-- 
2.47.3