Created
March 28, 2016 16:57
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IRC client written in pure bash using only bash builtin commands and no other binaries.
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#!/bin/bash | |
#no PATH, no way to accidently run any programs | |
PATH='' | |
#useful variables | |
term_height=0 | |
term_width=0 | |
term_scroll_height=0 | |
status_line_row=0 | |
irc_host='' | |
irc_channel='' | |
irc_nick='' | |
function scroll_bottom() { | |
echo -en '\e[999B' | |
} | |
#figure out terminal height, NOTE: moves cursor to bottom of terminal | |
function term_height() { | |
echo -en '\e[999B\e[6n' | |
read -s -r -d'[' | |
read -s -r -d';' term_height | |
read -s -r -d'R' term_width | |
echo -en '\e[999D' | |
} | |
#set the area the terminal is allowed to scroll in | |
function scroll_helper() { | |
term_scroll_height=$((term_height-2)) | |
status_line_row=$((term_height-1)) | |
echo -en "\e[0;${term_scroll_height}r" | |
} | |
function bottom_line() { | |
echo -en "\e[${term_height};0f" | |
} | |
function paste_data() { | |
echo -en '\e7' "\e[${term_scroll_height};0f" '\n' | |
echo -n " $1" | |
echo -en '\e8' | |
} | |
function status_line() { | |
echo -en '\e7' "\e[${status_line_row};0f" '\e[2K' | |
echo -en "\e[4;44mSTATUS: $irc_nick in $irc_channel @ $irc_host\e[0m" | |
echo -en '\e8' | |
} | |
function init_screen() { | |
echo -en '\e[r' #reset screen | |
term_height | |
scroll_helper | |
bottom_line | |
} | |
function net_fd_helper() { | |
local buff='' | |
#close 44 if open, then open read/write | |
exec 44>&- | |
exec 44<>"$1" | |
#delay slightly to improve chance of success | |
#read -s -r -t1 -u 44 | |
#try connecting, sometimes JOIN won't work here and will have to be done manually | |
echo "NICK $irc_nick" >&44 | |
echo "USER $irc_nick 8 * :${HOSTNAME} ${USER}" >&44 | |
echo "JOIN $irc_channel" >&44 | |
while true | |
do | |
while IFS='' read -s -r -t1 -u 44 | |
do | |
case "$REPLY" in | |
( :irc* ) | |
paste_data "$REPLY" | |
;; | |
( PING* ) | |
paste_data "$REPLY" | |
buff="${REPLY##*:}" | |
paste_data "PONG :$buff" | |
echo "PONG :$buff" >&44 | |
;; | |
( * ) | |
buff="${REPLY%%\!*}" | |
REPLY="${REPLY#*:*:}" | |
buff="<${buff/:/}> $REPLY" | |
paste_data "$buff" | |
;; | |
esac | |
done | |
while IFS='' read -r -t1 | |
do | |
status_line | |
echo -en '\e[2K\r> ' | |
case "$REPLY" in | |
( :shell* ) | |
buff="${REPLY#*\ }" | |
paste_data "$buff" | |
eval "$buff" | |
;; | |
( :reset ) | |
init_screen | |
break | |
;; | |
( /JOIN* ) | |
irc_channel="${REPLY##*\ }" | |
echo "${REPLY/\//}" >&44 | |
;; | |
( /QUIT* ) | |
echo "QUIT :${REPLY#*\ }" >&44 | |
exec 44>&- | |
exit 0 | |
;; | |
( /* ) | |
echo "${REPLY/\//}" >&44 | |
;; | |
( "" ) | |
break | |
;; | |
( * ) | |
echo "PRIVMSG $irc_channel :$REPLY" >&44 | |
;; | |
esac | |
buff="<$irc_nick> ${REPLY}" | |
paste_data "$buff" | |
done | |
done | |
} | |
function main() { | |
local irc_fd='' | |
scroll_bottom | |
read -p 'IRC Server (eg irc.rizon.net): ' -e -r irc_host | |
read -p 'IRC Channel (eg #foobar): ' -e -r irc_channel | |
read -p 'IRC Nickname (eg egg_lover): ' -e -r irc_nick | |
init_screen | |
net_fd_helper "/dev/tcp/$irc_host/6667" | |
} | |
main |
Regarding Line 4 (set PATH to empty string): How about absolute paths?
@daveloyall I did it to prevent myself from running non-bash builtins
That's really cool. Now do it in Batch!
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Really interesting magic going on here. 👍