Bash-Snippets/geo/geo

#!/bin/bash

#
# Bash utility for getting specific network info
# Author: Jake Meyer
# Github: https://github.com/jakewmeyer
#

currentVersion="1.8.0"
configuredClient=""

## This function determines which http get tool the system has installed and returns an error if there isnt one
getConfiguredClient()
{
    if  command -v curl &>/dev/null ; then
      configuredClient="curl"
    elif command -v wget &>/dev/null ; then
      configuredClient="wget"
    elif command -v fetch &>/dev/null ; then
      configuredClient="fetch"
    else
      echo "Error: This tool reqires either curl, wget, or fetch to be installed."
      return 1
    fi

}

## Allows to call the users configured client without if statements everywhere
httpGet()
{
  case "$configuredClient" in
    curl) curl -A curl -s "$@";;
    wget) wget -qO- "$@";;
    fetch) fetch -o "...";;
  esac
}
# Parse arguments passed + help formatting
usage() {
    echo "Usage: geo [flag]"
    echo "  -w  Returns WAN IP"
    echo "  -l  Returns LAN IP(s)"
    echo "  -r  Returns Router IP"
    echo "  -d  Returns DNS Nameserver"
    echo "  -m  Returns MAC address for interface. Ex. eth0"
    echo "  -g  Returns Current IP Geodata"
    echo "Custom Geo Output =>"
    echo "[all] [query] [city] [region] [country] [zip] [isp]"
    echo "Example: geo -a 8.8.8.8 -o city,zip,isp"
    echo "  -o  [options] Returns Specific Geodata"
    echo "  -a  [address] For specific ip in -s"
    echo "  -v  Returns Version"
    echo "  -h  Returns Help Screen"
    echo "  -u  Updates Bash-Snippets"
    exit
}

# Displays version number
version() {
  echo $currentVersion;
}

# Fetches WAN ip address
wan_search() {
  dig +short myip.opendns.com @resolver1.opendns.com
}

# Fetches current LAN ip address
lan_search() {
  if [ "$(uname)" = "Darwin" ]; then
    ifconfig | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*' | grep -v '127.0.0.1'
  elif [ "$(uname -s)" = "Linux" ]; then
    ip addr show | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*' | grep -v '127.0.0.1'
  else
    echo "OS not supported"
    exit 1
  fi
}

# Fetches Router ip address
router_search() {
  if [ "$(uname)" = "Darwin" ]; then
    netstat -rn | grep default | head -1 | awk '{print$2}'
  elif [ "$(uname -s)" = "Linux" ]; then
    ip route | grep ^default'\s'via | head -1 | awk '{print$3}'
  else
    echo "OS not supported"
    exit 1
  fi
}

# Fetches DNS nameserver
dns_search() {
  if [ "$(uname)" = "Darwin" ]; then
    grep -i nameserver /etc/resolv.conf |head -n1|cut -d ' ' -f2
  elif [ "$(uname -s)" = "Linux" ]; then
    cat /etc/resolv.conf | grep -i ^nameserver | cut -d ' ' -f2
  else
    echo "OS not supported"
    exit 1
  fi
}

# Fetches MAC address of
mac_search() {
  if [ "$(uname)" = "Darwin" ]; then
    ifconfig "$MAC" | grep -o -E '([[:xdigit:]]{1,2}:){5}[[:xdigit:]]{1,2}'
  elif [ "$(uname -s)" = "Linux" ]; then
    ip addr show "$MAC" | grep -o -E '([[:xdigit:]]{1,2}:){5}[[:xdigit:]]{1,2}' | grep -v ff:
  else
    echo "OS not supported"
    exit 1
  fi
}

# Fetches current geodata based on ip
geodata_search() {
  httpGet "http://ip-api.com/line/?fields=query,city,region,country,zip,isp"
}

# Fetches specific geodata based on args
specific_geo() {
  if [ "$OPTIONS" = "all" ]; then
    httpGet "http://ip-api.com/line/${ADDRESS}?fields=query,city,region,country,zip,isp"
  else
    httpGet "http://ip-api.com/line/${ADDRESS}?fields=${OPTIONS}"
  fi
}


update()
{
  # Author: Alexander Epstein https://github.com/alexanderepstein
  # Update utility version 1.2.0
  # To test the tool enter in the defualt values that are in the examples for each variable
  repositoryName="Bash-Snippets" #Name of repostiory to be updated ex. Sandman-Lite
  githubUserName="alexanderepstein" #username that hosts the repostiory ex. alexanderepstein
  nameOfInstallFile="install.sh" # change this if the installer file has a different name be sure to include file extension if there is one
  latestVersion=$(httpGet https://api.github.com/repos/$githubUserName/$repositoryName/tags | grep -Eo '"name":.*?[^\\]",'| head -1 | grep -Eo "[0-9.]+" ) #always grabs the tag without the v option

  if [[ $currentVersion == "" || $repositoryName == "" || $githubUserName == "" || $nameOfInstallFile == "" ]];then
    echo "Error: update utility has not been configured correctly." >&2
    exit 1
  elif [[ $latestVersion == "" ]];then
    echo "Error: no active internet connection" >&2
    exit 1
  else
    if [[ "$latestVersion" != "$currentVersion" ]]; then
      echo "Version $latestVersion available"
      echo -n "Do you wish to update $repositoryName [Y/n]: "
      read -r answer
      if [[ "$answer" == "Y" || "$answer" == "y" ]] ;then
        cd  ~ || { echo 'Update Failed' ; exit 1 ; }
        if [[ -d  ~/$repositoryName ]]; then rm -r -f $repositoryName  ||  { echo "Permissions Error: try running the update as sudo"; exit 1; } ; fi
        git clone "https://github.com/$githubUserName/$repositoryName" || { echo "Couldn't download latest version" ; exit 1; }
        cd $repositoryName ||  { echo 'Update Failed' ; exit 1 ;}
        git checkout "v$latestVersion" 2> /dev/null || git checkout "$latestVersion" 2> /dev/null || echo "Couldn't git checkout to stable release, updating to latest commit."
        chmod a+x install.sh #this might be necessary in your case but wasnt in mine.
        ./$nameOfInstallFile "update" || exit 1
        cd ..
        rm -r -f $repositoryName ||  { echo "Permissions Error: update succesfull but cannot delete temp files located at ~/$repositoryName delete this directory with sudo"; exit 1; }
      else
        exit 1
      fi
    else
      echo "$repositoryName is already the latest version"
    fi
  fi

}



checkInternet()
{
  echo "GET http://google.com HTTP/1.0\n\n" | nc google.com 80 > /dev/null 2>&1 # query google with a get request
  if [ $? -eq 0 ]; then #check if the output is 0, if so no errors have occured and we have connected to google successfully
    return 0
  else
    echo "Error: no active internet connection" >&2 #sent to stderr
    return 1
  fi
}


# Option parsing "controller"
optspec="uwlrdm:go:a:vh*:"
while getopts "$optspec" optchar
do
    case "${optchar}" in
        w) wan_search ;;
        l) lan_search ;;
        r) router_search ;;
        d) dns_search ;;
        m) MAC=$OPTARG mac_search;;
        g) getConfiguredClient && checkInternet && geodata_search || exit 1 ;;
        a) ADDRESS=$OPTARG ;;
        o) getConfiguredClient && checkInternet && OPTIONS=$OPTARG specific_geo || exit 1 ;;
        v) version ;;
        h) usage ;;
        u) getConfiguredClient && checkInternet && update || exit 1 ;;
        *) usage ;;
    esac
done

# Makes geo command default to help screen for usability
if [ $# -eq 0 ];
then
    usage
    exit 0
elif [[ $1 == "update" ]];then
  getConfiguredClient && checkInternet && update || exit 1
elif [[ $1 == "help" ]];then
  usage
  exit 0
fi