Ubuntu/Scripts
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#recipient_mx='recipient mail exchanger' ---obsolete | #recipient_mx='recipient mail exchanger' ---obsolete | ||
DATE=$(date) | DATE=$(date) | ||
+ | sender_domain=$(printf "$from" | sed 's/^.*@//') | ||
messageidrandom=$(od -vAn -N4 -tu4 < /dev/urandom) | messageidrandom=$(od -vAn -N4 -tu4 < /dev/urandom) | ||
− | messageid=$messageidrandom'@ | + | messageid="$messageidrandom"'@'"$sender_domain" |
IP=$(curl checkip.dyndns.org|awk '/Address:/ {print$6}'|sed 's/<.*/ /') | IP=$(curl checkip.dyndns.org|awk '/Address:/ {print$6}'|sed 's/<.*/ /') | ||
UPTIME=$(uptime) | UPTIME=$(uptime) |
Revision as of 21:27, 25 September 2015
Contents |
Email current IP address
Variables needing to be defined:
- sender domain (@sender domain.com)
- recipient (recipient address)
- recipient mail exchanger (recipient mail exchanger) ---FIXED, no longer needed
Variables automatically defined
- HOSTNAME - defined by using the hostname command
- DATE - defined by using the date command
- IP - queries checkip.dyndns.org and then parses the return to exclude everything except the IP address
- UPTIME - defined by using the uptime command
- USERS - defined by using the users command
- RECIP_DOMAIN - defined by parsing the domain from the recipients' address
- RECIP_MX - defined by querying the recipient's MX and picking the record with the highest priority
- MESSAGEID - automatically created using random numbers and the sender's domain
Code
#!/bin/bash -x #static variables from="$HOSTNAME"'@sender domain.com' to='recipient address' #dynamic variables HOSTNAME=$(hostname) #recipient_mx='recipient mail exchanger' ---obsolete DATE=$(date) sender_domain=$(printf "$from" | sed 's/^.*@//') messageidrandom=$(od -vAn -N4 -tu4 < /dev/urandom) messageid="$messageidrandom"'@'"$sender_domain" IP=$(curl checkip.dyndns.org|awk '/Address:/ {print$6}'|sed 's/<.*/ /') UPTIME=$(uptime) USERS=$(users) recip_domain=$(printf "$to" | sed 's/^.*@//') recip_mx=$(dig +short $recip_domain mx | sort -n | nawk '{print $2;exit}' | sed 's/\(.*\)./\1/') #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: <'"$to"'>\n' printf '\n' printf '\n' printf 'hostname='"$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 $recip_mx 25
Learned
- you cannot define a variable as the same exact spelling of the command.
WRONG: hostname ≠ `hostname` RIGHT: HOSTNAME = `hostname`
- you can call a standard command and define its output as a variable, so long as you use " ` " around the command (old school) or "$( )" around it
WRONG: HOSTNAME ≠ 'hostname' RIGHT: 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
- a wise man told me that i'm supposed to separate the headers from the body of the message with (2) linefeeds. Added to the script.