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Fix ifconfig parsing #2

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8b56dc0
Made MAC parsing more robust
jsl123 Oct 12, 2017
8baff85
Fixing markdown
jsl123 Oct 12, 2017
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10 changes: 6 additions & 4 deletions README.md
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Expand Up @@ -12,7 +12,7 @@ PGP Key 0x30D2ABDB2DF72435

A service written in bash to resolve ongoing issues with IP aliasing when using Amazon EC2 virtual machines without the benefit of ec2-net-utils.

###Features
### Features

- Adds and removes routing table entries on RHEL Amazon EC2 virtual machines to support the mapping of multiple public IP addresses to the same EC2 instance.

Expand All @@ -22,7 +22,7 @@ A service written in bash to resolve ongoing issues with IP aliasing when using

- Multiple IP mappings are supported

###To Do
### To Do

The following features are planned:

Expand All @@ -38,11 +38,11 @@ The following features are planned:

3. On your server, copy the systemd service file `aliaser.service` to `/etc/systemd/system/aliaser.service`

4. Copy the shell script `aliaser` to `/usr/bin/aliaser`
4. Copy the shell script `aliaser` to `/usr/sbin/aliaser`

5. Assign the script an executable bit to the shell script as follows:

`#chmod +x /usr/bin/aliaser`
`#chmod +x /usr/sbin/aliaser`

6. `aliaser` will is now installed! Start the `aliaser` service:

Expand Down Expand Up @@ -80,6 +80,8 @@ The following features are planned:
The output of `curl http://169.254.169.254/latest/meta-data/public-ipv4` has proven unpredictable. Unfortunately the Primary Public IP filed for
`./aliaser print` initially relied on this EC2 API call. I am working on formatting another option that will produce stable output. This does not impact the actual functionality of the IP address allocation.

Please be sure to install `curl` (through your package management tool) before installing aliaser

### Licensing and Copyright

Copyright ©2017 Josh Wieder
Expand Down
15 changes: 12 additions & 3 deletions aliaser
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Expand Up @@ -19,10 +19,18 @@ fi
#printf "\n"
#declare -a ETHINT=($interface)

#case $ETHINT in
ETHINT=${ETHINT:-eth0}

function mac-grab {
MAC_ADDR=$(ifconfig eth0 | sed -n 's/.*ether \([a-f0-9:]*\).*/\1/p')
MAC_ADDR=$(ip addr list $ETHINT | sed -n 's/.*link\/ether \([a-f0-9:]*\).*/\1/p')
if test -z "$MAC_ADDR" ; then
MAC_ADDR=$(ifconfig $ETHINT | sed -n 's/.*ether \([a-f0-9:]*\).*/\1/p')
fi
if test -z "$MAC_ADDR" ; then
echo "Can't determine mac address, giving up"
exit 1
fi
MAC_ADDR=$(echo "$MAC_ADDR" | tr 'A-F' 'a-f')
}

function public-grab {
Expand All @@ -38,10 +46,11 @@ function primary-private-grab {
}

function private-loop {
local priv
for priv in ${PRIVATE[@]:1};
do
echo "Adding IP: $priv"
ip addr add dev eth0 $priv/$SUBNET_CIDR_BLOCK
ip addr add dev $ETHINT $priv/$SUBNET_CIDR_BLOCK
done
}

Expand Down
6 changes: 3 additions & 3 deletions aliaser.service
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Expand Up @@ -10,9 +10,9 @@ Type=oneshot
User=root
RemainAfterExit=yes

ExecStart=/usr/bin/aliaser start
ExecReload=/usr/bin/aliaser reload
ExecStop=/usr/bin/aliaser stop
ExecStart=/usr/sbin/aliaser start
ExecReload=/usr/sbin/aliaser reload
ExecStop=/usr/sbin/aliaser stop

[Install]
WantedBy=multi-user.target