shell-network/modules/net-utils.mod

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#!/bin/bash
# usage:
# [[ $(host_reachable host.net) ]] && echo sure || echo nope
# or
# host_reachable &> /dev/null && echo sure || echo nope
# or
host_reachable () {
# usage: host_reachable < -F configfile > host < port >
# reachable returns yes and return 0
# return 1 - not reachable
# return 2 no method available to try
local host; local config
function try( ) (
if [[ $(command -v nmap) ]] && [[ $2 ]]; then
[[ $(nmap $1 -PN -p $2 | grep open) ]] && echo yes && return 0 || return 1
fi
if [[ $(command -v nc) ]] && [[ $2 ]]; then
[[ $(nc -w 2 $1 $2) ]] && echo yes && return 0 || return 1
fi
if [[ $(command -v ping) ]]; then
ping -c1 -W1 $1 &> /dev/null && echo yes && return 0 || return 1
fi
return 2 # return 2 to indicate no method was available
)
[[ $1 = "-F " ]] && { config=$2;shift 2; }
host=$(lookup_host $1 $config)
try $host $2
return $?
}
lookup_host () {
# usage: lookup_host hostname < configfile >
local config; local host; local lhost
config=$([[ $2 ]] && echo $2 || echo ${SSH_CONFIG:-$HOME/.ssh/config})
host=$(parse_host $1)
lhost=$(ssh -F $config -G $host | grep -w hostname | cut -d' ' -f2)
[[ $lhost ]] && echo $lhost || echo $host
}
parse_host () {
# usage: parse_host <user/host>
# returns extracted host if passed user@host
# otherwise return value passed
[[ $1 =~ "@" ]] && { echo $(sed 's/.*@\(.*\)/\1/' <<< "$1");return 0; }
echo $1
return 1
}
parse_user () {
# usage: parse_user <user/host>
# returns extracted user if passed user@host
# otherwise returns nothing
# return 1 no user in string
[[ $1 =~ "@" ]] && { echo $(sed 's/\(.*\)@.*/\1/' <<< "$1"); return 0; } || return 1
}
valid_ip()
{
# usage: valid_ip ip
# check so see if basic format is correct and all subs or numbers, no returns 2
# then checks if they are 0 to 254, no returns 1
# otherwise if good returns "true" and 0
local ip=$1
local res
if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
OIFS=$IFS
IFS='.'
ip=($ip)
IFS=$OIFS
[[ ${ip[0]} -le 255 && ${ip[1]} -le 255 \
&& ${ip[2]} -le 255 && ${ip[3]} -le 255 ]]
res=$([ $? == 0 ] && echo true)
[[ $res ]] && { echo $res;return 0; }
return 1
fi
return 2
}
get_domain() {
# usage: get_domain fulldomain
# returns domain.tld
# exampe: get_domain discuss.mydomain.com => returns mydomain.com
local domain
domain=$(echo $1 | awk -F\. '{print $(NF-1) FS $NF}')
echo "$domain"
}
publicip () {
dig +short myip.opendns.com @resolver1.opendns.com
}
getip () {
dig +short $1 | tail -1
}