Ubuntu/Scripts
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Email current IP address
Variables needing to be defined:
- sender domain (@sennder domain.com)
- recipient (recipient address)
- recipient mail exchanger (recipient mail exchanger)
Variables automatically defined
- HOSTNAME - defined by using the hostname command
- DATE - defined by using the date command
- IP - queries checkip.dyndns.org and then parses the return to exclude everything except the IP address
- UPTIME - defined by using the uptime command
- USERS - defined by using the users command
Code
#!/bin/bash -x #define variables HOSTNAME=`hostname` from="$HOSTNAME"'@sender domain.com' to='recipient address' recipient_mx='recipient mail exchanger' DATE=`date` messageid='[email protected]' IP=$(curl checkip.dyndns.org|awk '/Address:/ {print$6}'|sed 's/<.*/ /') UPTIME=`uptime` USERS=`users` #function containing mail commands. Contains enough RFC required fields to satisfy gmail's requirements to allow the message, though it may be detected as spam if you do not have a SPF record. function mail_input { sleep 1 echo 'ehlo test.com\n' sleep 0.5 printf 'mail from:<'"$from"'>\n' sleep 1 printf 'rcpt to:<'"$to"'>\n' sleep 1 printf 'data\n' sleep 0.5 printf 'Return-Path: <'"$from"'>\n' printf 'Date: '"$DATE"'\n' printf 'Message-ID: <'"$messageid"'>\n' printf 'Subject: '"$HOSTNAME"' ip address= '"$IP"'\n' printf 'From: <'"$from"'>\n' printf 'To: <'"$to"'>\n' printf 'hostname='"$HOSTNAME"'\n' printf 'ip address= '"$IP"'\n' printf 'uptime= '"$UPTIME"'\n' printf 'users logged in= '"$USERS"'\n' printf '.\n' printf 'quit' } #sending mail with mail_input function mail_input | telnet $recipient_mx 25
Learned
- you cannot define a variable as the same exact spelling of the command.
WRONG: hostname ≠ `hostname` RIGHT: HOSTNAME = `hostname`
- you can call a standard command and define its output as a variable, so long as you use " ` " around the command
WRONG: HOSTNAME ≠ 'hostname' RIGHT: HOSTNAME = `hostname`
- when using printf you should be careful which type of quote to use. a single quote should be used for plain text, such as a static heading to an output. a double quote should be used for defining variables.
WRONG: printf "Address: " '$IP' "\n" RIGHT: printf 'Address: ' "$IP" '\n'
adding -x to your #!/bin/bash statement will cause everything to be printed, useful in troubleshooting
#!/bin/bash -x