Ubuntu/Scripts
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| + | [[Ubuntu/Scripts|Scripts]] | [[Ubuntu/Scripts/SSL_Expire|SSL Expire]] | [[Ubuntu/Scripts/PulseAudio|PulseAudio]] | ||
| + | |||
==Email current IP address== | ==Email current IP address== | ||
====Variables needing to be defined:==== | ====Variables needing to be defined:==== | ||
| − | *sender domain (@ | + | *sender domain (@sender domain.com) |
*recipient (recipient address) | *recipient (recipient address) | ||
| − | |||
====Variables automatically defined==== | ====Variables automatically defined==== | ||
| Line 9: | Line 10: | ||
*DATE - defined by using the date 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 | *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 | ||
| + | *SENDER_DOMAIN - defined by parsing the domain from the senders' address, used for the messageid | ||
| + | *MESSAGEID - automatically created using random numbers and the sender's domain<br> | ||
| + | Another way to gen random, which is awesome: | ||
| + | <nowiki>~$ openssl rand -hex 12 | ||
| + | ~$ openssl rand -base64 12</nowiki> | ||
| + | *BOUNDARY - automatically created for content-type boundaries | ||
====Code==== | ====Code==== | ||
| − | #!/bin/bash -x | + | <nowiki>#!/bin/bash -x |
| − | + | ||
| − | + | #static variables | |
| − | + | from="$HOSTNAME"'@sender domain.com' | |
| − | + | to='recipient address' | |
| − | + | ||
| − | + | #dynamic variables | |
| − | + | HOSTNAME=$(hostname) | |
| − | + | #recipient_mx='recipient mail exchanger' ---obsolete | |
| − | + | DATE=$(date -R) | |
| − | + | sender_domain=$(printf "$from" | sed 's/^.*@//') | |
| − | + | messageidrandom=$(od -vAn -N4 -tu4 < /dev/urandom) | |
| − | + | messageidrandom=$(printf "$messageidrandom" | sed 's/ //') | |
| − | + | 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/') | ||
| + | boundaryrandom=$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1) | ||
| + | boundary='b1_'"$boundaryrandom" | ||
| + | |||
| + | #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 { | function mail_input { | ||
| − | + | sleep 1 | |
| − | + | printf '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: <'"$to"'>\n' | |
| − | + | printf 'Content-type: multipart/alternative;\n' | |
| − | + | printf ' boundary="'"$boundary"'"\n' | |
| − | + | printf '\n' | |
| − | + | printf '\n' | |
| − | + | printf "%s\n" '--'"$boundary"'' | |
| − | + | printf 'Content-type: text/plain;\n' | |
| + | printf ' charset="UTF-8"\n' | ||
| + | printf 'Content-transfer-encoding: quoted-printable\n' | ||
| + | printf '\n' | ||
| + | printf 'hostname: '"$HOSTNAME"'\n' | ||
| + | printf 'ip address: '"$IP"'\n' | ||
| + | printf 'uptime: '"$UPTIME"'\n' | ||
| + | printf 'users logged in: '"$USERS"'\n' | ||
| + | printf '\n' | ||
| + | printf '\n' | ||
| + | printf "%s\n" '--'"$boundary"'' | ||
| + | printf 'Content-type: text/html;\n' | ||
| + | printf ' charset="UTF-8"\n' | ||
| + | printf 'Content-transfer-encoding: quoted-printable\n' | ||
| + | printf '\n' | ||
| + | printf '<html>\n' | ||
| + | printf '<head>\n' | ||
| + | printf '<meta http-equiv=3D"Content-Type" content="3Dtext/html; charset=3Dutf-8">\n' | ||
| + | printf '</head>\n' | ||
| + | printf '<body>\n' | ||
| + | printf 'hostname: '"$HOSTNAME"'<br>\n' | ||
| + | printf 'ip address: '"$IP"'<br>\n' | ||
| + | printf 'uptime: '"$UPTIME"'<br>\n' | ||
| + | printf 'users logged in: '"$USERS"'<br>\n' | ||
| + | printf '</body>\n' | ||
| + | printf '</html>\n' | ||
| + | printf '\n' | ||
| + | printf '\n' | ||
| + | printf "%s\n" '--'"$boundary"'--' | ||
| + | printf '\n' | ||
| + | printf '\n' | ||
| + | printf '\n' | ||
| + | printf '.\n' | ||
| + | sleep 3 | ||
| + | printf 'quit' | ||
| + | sleep 10 | ||
| + | kill $$ | ||
} | } | ||
| − | + | ||
| − | + | #sending mail with mail_input function | |
| − | + | #plain text | |
| + | mail_input | telnet $recip_mx 25 | ||
| + | #TLS encrypted | ||
| + | #mail_input | openssl s_client -crlf -starttls smtp -quiet -connect $recip_mx:25 | ||
| + | </nowiki> | ||
====Learned==== | ====Learned==== | ||
| Line 56: | Line 116: | ||
WRONG: hostname ≠ `hostname` | WRONG: hostname ≠ `hostname` | ||
RIGHT: HOSTNAME = `hostname` | RIGHT: HOSTNAME = `hostname` | ||
| − | *you can call a standard command and define its output as a variable, so long as you use " ` " around the command | + | *you can call a standard command and define its output as a variable, so long as you use " ` " around the command (old school) or "$( )" around it |
WRONG: HOSTNAME ≠ 'hostname' | WRONG: HOSTNAME ≠ 'hostname' | ||
RIGHT: HOSTNAME = `hostname` | RIGHT: HOSTNAME = `hostname` | ||
| + | RIGHT: HOSTNAME = $(hostname) | ||
*when using printf you should be careful which type of quote to use. a single quote should be used for plain text, such as a static heading to an output. a double quote should be used for defining variables. | *when using printf you should be careful which type of quote to use. a single quote should be used for plain text, such as a static heading to an output. a double quote should be used for defining variables. | ||
WRONG: printf "Address: " '$IP' "\n" | WRONG: printf "Address: " '$IP' "\n" | ||
| Line 64: | Line 125: | ||
adding -x to your #!/bin/bash statement will cause everything to be printed, useful in troubleshooting | adding -x to your #!/bin/bash statement will cause everything to be printed, useful in troubleshooting | ||
#!/bin/bash -x | #!/bin/bash -x | ||
| + | *a wise man told me that i'm supposed to separate the headers from the body of the message with (2) linefeeds. Added to the script. | ||
Latest revision as of 01:17, 14 January 2022
Scripts | SSL Expire | PulseAudio
Contents |
[edit] Email current IP address
[edit] Variables needing to be defined:
- sender domain (@sender domain.com)
- recipient (recipient address)
[edit] Variables automatically defined
- HOSTNAME - defined by using the hostname command
- DATE - defined by using the date command
- IP - queries checkip.dyndns.org and then parses the return to exclude everything except the IP address
- UPTIME - defined by using the uptime command
- USERS - defined by using the users command
- RECIP_DOMAIN - defined by parsing the domain from the recipients' address
- RECIP_MX - defined by querying the recipient's MX and picking the record with the highest priority
- SENDER_DOMAIN - defined by parsing the domain from the senders' address, used for the messageid
- MESSAGEID - automatically created using random numbers and the sender's domain
Another way to gen random, which is awesome:
~$ openssl rand -hex 12 ~$ openssl rand -base64 12
- BOUNDARY - automatically created for content-type boundaries
[edit] 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=$(date -R)
sender_domain=$(printf "$from" | sed 's/^.*@//')
messageidrandom=$(od -vAn -N4 -tu4 < /dev/urandom)
messageidrandom=$(printf "$messageidrandom" | sed 's/ //')
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/')
boundaryrandom=$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1)
boundary='b1_'"$boundaryrandom"
#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
printf '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: <'"$to"'>\n'
printf 'Content-type: multipart/alternative;\n'
printf ' boundary="'"$boundary"'"\n'
printf '\n'
printf '\n'
printf "%s\n" '--'"$boundary"''
printf 'Content-type: text/plain;\n'
printf ' charset="UTF-8"\n'
printf 'Content-transfer-encoding: quoted-printable\n'
printf '\n'
printf 'hostname: '"$HOSTNAME"'\n'
printf 'ip address: '"$IP"'\n'
printf 'uptime: '"$UPTIME"'\n'
printf 'users logged in: '"$USERS"'\n'
printf '\n'
printf '\n'
printf "%s\n" '--'"$boundary"''
printf 'Content-type: text/html;\n'
printf ' charset="UTF-8"\n'
printf 'Content-transfer-encoding: quoted-printable\n'
printf '\n'
printf '<html>\n'
printf '<head>\n'
printf '<meta http-equiv=3D"Content-Type" content="3Dtext/html; charset=3Dutf-8">\n'
printf '</head>\n'
printf '<body>\n'
printf 'hostname: '"$HOSTNAME"'<br>\n'
printf 'ip address: '"$IP"'<br>\n'
printf 'uptime: '"$UPTIME"'<br>\n'
printf 'users logged in: '"$USERS"'<br>\n'
printf '</body>\n'
printf '</html>\n'
printf '\n'
printf '\n'
printf "%s\n" '--'"$boundary"'--'
printf '\n'
printf '\n'
printf '\n'
printf '.\n'
sleep 3
printf 'quit'
sleep 10
kill $$
}
#sending mail with mail_input function
#plain text
mail_input | telnet $recip_mx 25
#TLS encrypted
#mail_input | openssl s_client -crlf -starttls smtp -quiet -connect $recip_mx:25
[edit] Learned
- you cannot define a variable as the same exact spelling of the command.
WRONG: hostname ≠ `hostname` RIGHT: HOSTNAME = `hostname`
- you can call a standard command and define its output as a variable, so long as you use " ` " around the command (old school) or "$( )" 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.
