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.

diff --git a/include/iface.sh b/include/iface.sh
new file mode 100644 (file)
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
+}