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Get IP info from outgoing interface

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Use IP to get interface information from outgoing interface. Use CIDR notation to make things easier.
This commit is contained in:
Dan Schaper 2015-11-25 14:08:13 -08:00
parent 4057a076a2
commit 21ee63b7fb
1 changed files with 9 additions and 19 deletions
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28
automated install/basic-install.sh
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@ -1,4 +1,4 @@
#!/bin/bash
#!/usr/bin/env bash
# Pi-hole: A black hole for Internet advertisements
# by Jacob Salmela
# Network-wide ad blocking via your Raspberry Pi
@ -24,9 +24,11 @@ columns=$(stty -a | tr \; \\012 | egrep 'columns' | cut -d' ' -f3)
r=$(( rows / 2 ))
c=$(( columns / 2 ))
IPv4addr=$(ip -4 addr show | awk '{match($0,/[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/); ip = substr($0,RSTART,RLENGTH); print ip}' | sed '/^\s*$/d' | grep -v "127.0.0.1")
IPv4mask=$(ifconfig | awk -F':' '/inet addr/ && !/127.0.0.1/ {print $4}')
IPv4gw=$(ip route show | awk '/default\ via/ {print $3}')
# Find IP used to route to outside world
IPv4info=$(ip route get 8.8.8.8)
IPv4dev=$(echo $IPv4info| awk '{print $5}')
IPv4addr=$(ip -o -f inet addr show dev $IPv4dev | awk '{print $4}')
IPv4gw=$(echo $IPv4info | awk '{print $3}')
# IPv6 support to be added later
#IPv6eui64=$(ip addr show | awk '/scope\ global/ && /ff:fe/ {print $2}' | cut -d'/' -f1)
@ -117,7 +119,6 @@ getStaticIPv4Settings()
if (whiptail --backtitle "Calibrating network interface" --title "Static IP Address" --yesno "Do you want to use your current network settings as a static address?
IP address: $IPv4addr
Subnet mask: $IPv4mask
Gateway: $IPv4gw" $r $c) then
# If they choose yes, let the user know that the IP address will not be available via DHCP and may cause a conflict.
whiptail --msgbox --backtitle "IP information" --title "FYI: IP Conflict" "It is possible your router could still try to assign this IP to a device, which would cause a conflict. But in most cases the router is smart enough to not do that.
@ -138,22 +139,17 @@ else
IPv4addr=$(whiptail --backtitle "Calibrating network interface" --title "IPv4 address" --inputbox "Enter your desired IPv4 address" $r $c $IPv4addr 3>&1 1>&2 2>&3)
if [[ $? = 0 ]];then
echo "Your static IPv4 address: $IPv4addr"
# Ask for the subnet mask
IPv4mask=$(whiptail --backtitle "Calibrating network interface" --title "IPv4 netmask" --inputbox "Enter your desired IPv4 subnet mask" $r $c $IPv4mask 3>&1 1>&2 2>&3)
if [[ $? = 0 ]];then
echo "Your static IPv4 netmask: $IPv4mask"
# Ask for the gateway
# Ask for the gateway
IPv4gw=$(whiptail --backtitle "Calibrating network interface" --title "IPv4 gateway (router)" --inputbox "Enter your desired IPv4 default gateway" $r $c $IPv4gw 3>&1 1>&2 2>&3)
if [[ $? = 0 ]];then
echo "Your static IPv4 gateway: $IPv4gw"
# Give the user a chance to review their settings before moving on
if (whiptail --backtitle "Calibrating network interface" --title "Static IP Address" --yesno "Are these settings correct?
IP address: $IPv4addr
Subnet mask: $IPv4mask
Gateway: $IPv4gw" $r $c)then
# If the settings are correct, then we need to set the piholeIP
# Saving it to a temporary file us to retrieve it later when we run the gravity.sh script
echo $IPv4addr > /tmp/piholeIP
echo ${IPv4addr%/*} > /tmp/piholeIP
# After that's done, the loop ends and we move on
ipSettingsCorrect=True
else
@ -167,12 +163,6 @@ else
exit
fi
else
# Cancelling subnet mask settings window
ipSettingsCorrect=False
echo "User canceled."
exit
fi
else
# Cancelling IPv4 settings window
ipSettingsCorrect=False
echo "User canceled."
@ -188,7 +178,7 @@ setStaticIPv4()
{
# Append these lines to /etc/dhcpcd.conf to enable a static IP
echo "interface $piholeInterface
static ip_address=$IPv4addr/24
static ip_address=$IPv4addr
static routers=$IPv4gw
static domain_name_servers=$IPv4gw" | sudo tee -a $dhcpcdFile >/dev/null
}