DevOps-Bash-tools/.bash.d/network.sh

#!/usr/bin/env bash
#  vim:ts=4:sts=4:sw=4:et
#
#  Author: Hari Sekhon
#  Date: circa 2006-2012 (forked from .bashrc)
#
#  https://github.com/harisekhon/bash-tools
#
#  License: see accompanying Hari Sekhon LICENSE file
#
#  If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish
#
#  https://www.linkedin.com/in/harisekhon
#

# ============================================================================ #
#                                 N e t w o r k
# ============================================================================ #

alias 4="ping 4.2.2.1"

# using alias p for 'kubectl get pods' now
#alias ping="ping -n"
#alias p=ping

pingwait="-w"
[ "${APPLE:-}" ] && pingwait="-W"

checkhost(){
    if [ -z "$1" ]; then
        echo "usage: checkhost hostname/ip"
        return 1
    fi
    if grep -qi "unknown host" <<< "$(ping -c 1 "$pingwait" 1 "$1" 2>&1)"; then
        echo "Unknown host"
        return 1
    fi
}

alias google="while true; do ping www.google.com && break; sleep 1 || break; done"
alias g=google

# watch_url.pl is in DevOps-Perl-tools repo which should be in $PATH
alias wg="watch_url.pl google.com"

n(){
    if command -v host &>/dev/null; then
        host "$@"
    elif command -v nslookup &>/dev/null; then
        nslookup "$@"
    else
        echo "neither host nor nslookup were found in the path"
        return 1
    fi
}
alias h=n

getip(){
    host "$@" | grep "has address" | awk '{print $4; exit}'
}

tping(){
    while true; do
        #echo -n "`date '+%F %T'`   "
        local output
        output="$(ping -c 1 "$pingwait" 2 "$1" |
                  grep -v -e statistics \
                          -e "transmitted" \
                          -e "rtt min/avg/max/mdev" \
                          -e "bytes of data" \
                          -e "^\s*$" \
                          -e "^PING " \
                          -e "round-trip"
                 )"
        echo "$(date '+%F %T')   ${output:-no response from $1}"
        sleep 1
    done
}

port(){
    if [ -z "$2" ]; then
        echo "You must supply a hostname/ip address to test followed by a port number"
        return 1
    fi
    #sudo nmap $1 -p $2 ${@:3} -P0 | grep tcp
    nc -zv "$1" "$2" 2>&1 | grep -v "DNS fwd/rev misma" | sed 's/[^]]*\] //'
}

testport(){
    if [ -z "$2" ]; then
        echo "You must supply a hostname/ip address to test followed by a port number"
        return 1
    fi
    while true; do
        timestampcmd port "$1" "$2"
        sleep 1
    done
}

hammerport(){
    for i in {1..500}; do
        printf "%-3s: " "$i"
        nc -z -v "$1" "$2"
    done
}

halfopen(){
    while true; do
        echo -n "half-open connections: "
        netstat -ant | grep c SYN_RECV
        sleep 1
    done
}

get_gw(){
    local gw
    gw="$(netstat -rn | awk '/^default/ {print $2;exit}')"
    if [ -z "$gw" ]; then
        echo "Could not find gateway, no default route! " >&2
        return 1
    fi
    echo "$gw"
}

gw(){
    local gw
    gw="$(get_gw)"
    [ -n "$gw" ] || return 1
    ping "$gw"
}


z(){
    local gw
    gw="$(get_gw)"
    if [ -n "$gw" ]; then
        whenup "$gw" &&
        whenup 4.2.2.1 &&
        whenup www.google.com echo "INTERNET OK"
    else
        echo "Couldn't find gateway, cannot test upstream connectivity!"
        return 1
    fi
}

myip(){
    ifconfig | grep 'inet[[:space:]]' | grep -v 127.0.0.1 | awk '{print $2}'
}

whatismyip(){
    #lynx -dump $(lynx -dump www.whatismyip.com | tail -n 1)
    lynx -useragent="Mozilla" -dump www.whatismyip.com 2>/dev/null | awk '/Address Lookup Your IP|Your Public IPv6 is:/ {print $6}'
}

browser(){
    if [ -n "$BROWSER" ]; then
        "$BROWSER" "$@"
    elif [ -n "$APPLE" ]; then
        open "$@"
    else
        echo "\$BROWSER environment variable not set and not on Mac OSX, not sure which browser to use, aborting..."
        return 1
    fi
}

downorjustme(){
    browser "http://www.downforeveryoneorjustme.com/$1"
}

# directs to the same as downorjustme
isupme(){
    browser "http://www.isup.me/$1"
}

chrome(){
    checkprog google-chrome || return 1
    google-chrome "${*:-http://www.google.com}" &
}

ff(){
    checkprog firefox || return 1
    firefox "${*:-http://www.google.com}" &
}

gg(){
    if [ -z "$*" ]; then
        browser &
    else
        searchterm="$(sed 's/ /%20/g' <<< "$*")"
        browser "http://www.google.com/search?q=$searchterm" &
    fi
}

netcraft(){
    checkprog firefox || return 1
    browser "http://uptime.netcraft.com/up/graph?site=$*" &
}

wikipedia(){
    checkprog "firefox" || return 1
    local searchterm
    searchterm="$(sed 's/ /%20/g' <<< "$*")"
    browser "http://en.wikipedia.org?search=$searchterm&go=Go" &
}
alias wiki=wikipedia

definition(){
    checkprog "firefox" || return 1
    local searchterm
    searchterm="$(sed 's/ /%20/g' <<< "$*")"
    # hl=en&q=test&btnI=I%27m+Feeling+Lucky&meta=&aq=f
    browser "http://www.google.co.uk/search?hl=en&q=definition+$searchterm&btnI=I%27m+Feeling+Lucky" &
}
# alias def=definition

# gh(){
#     url="http://www.google.com/search?q="
#     browser "${url}site%3A$*" &
#     browser "${url}site%3A$* login" &
#     browser "${url}link%3A$*" &
#     browser "${url}related%3A$*" &
# }


# ============================================================================ #
#                                 M a c   O S X
# ============================================================================ #

if [ -z "$APPLE" ]; then
    return
fi

flushdns(){
    dscacheutil -flushcache
    sudo killall -HUP mDNSResponder
}
alias flushcache=flushdns

# Cisco AnyConnect set these rules which mess up my ability to connect directly to VirtualBox VMs on HostOnly Networking
cleardeny(){
    sudo ipfw delete "$(sudo ipfw list | grep deny | awk '{print $1}')"
}
ipfwqflush(){
    sudo ipfw -q flush
}

isMacNetworkService(){
    local interface="$1"
    if [ "$interface" != "Thunderbolt Ethernet" ] &&
       [ "$interface" != "Wi-Fi" ]; then
        echo "interface must be one of Thunderbolt Ethernet or Wi-Fi"
        return 1
    fi
}

set_dns(){
    get_apple_interfaces |
    while read -r interface; do
        sudo networksetup -setdnsservers "$interface" "$@"
    done
}

set_dns_search(){
    get_apple_interfaces |
    while read -r interface; do
        sudo networksetup -setsearchdomains "$interface" "$@"
    done
}

set_dns_search_empty(){
        set_dns_search "Empty"
}
# this wasn't found as an alias from another function
clear_dns_search(){
    set_dns_search_empty
}

function publicdns(){
    set_dns 4.2.2.1 4.2.2.2 4.2.2.3 4.2.2.4 4.2.2.5 4.2.2.6
    set_dns_search_empty
}

function dhcpdns(){
    clear_dns_search # hangs without this as I think it tries to query DNS for all the suffixes in the list
    set_dns "Empty"
    #networksetup -setsearchdomains <networkservice> <domain1> [domain2]
}