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