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nstarke/network-callout.sh

Created June 21, 2022 21:41
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  1. nstarke created this gist Jun 21, 2022.
    92 changes: 92 additions & 0 deletions network-callout.sh
    View file
    Original file line number Diff line number Diff line change
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    #!/bin/bash
    # sudo apt install iw curl jq
    ALIVE="$1"

    check_public_ip() {
    INTERFACE="$1"
    PUBLIC_IP=$(curl -s https://httpbin.org/ip | jq -r .origin)
    if ! [[ -z $PUBLIC_IP ]]; then
    echo "[+] Found Public IP $PUBLIC_IP for $INTERFACE"
    fi
    }

    check_interface() {
    INTERFACE="$1"
    IP_ADDRESS=$(ip -4 addr show $INTERFACE | grep "inet" | awk -F" " '{print $2}' | awk -F"/" '{print $1}')

    echo "[+] Found IPv4: $IP_ADDRESS for interface $INTERFACE"
    IPV6_ADDRESS=$(ip -6 addr show $INTERFACE | grep "inet" | awk -F" " '{print $2}' | awk -F"/" '{print $1}')

    echo "[+] Found IPv6: $IPV6_ADDRESS for interface $INTERFACE"
    if [[ -z $IP_ADDRESS ]] && [[ -z $IPV6_ADDRESS ]]; then
    return 1
    fi

    if ! [[ -z $IP_ADDRESS ]]; then
    LINE_COUNT=$(ping -4 -c 4 -I $INTERFACE $ALIVE 2>/dev/null | wc -l)
    if [ $LINE_COUNT -gt 4 ]; then
    echo "[+] Reached Internet on $INTERFACE with local IP address $IP_ADDRESS"
    check_public_ip "$INTERFACE"
    fi
    fi

    if ! [[ -z $IPV6_ADDRESS ]]; then
    LINE_COUNT=$(ping -6 -c 4 -I $INTERFACE $ALIVE 2>/dev/null | wc -l)
    if [ $LINE_COUNT -gt 4 ]; then
    echo "Reached Internet on $INTERFACE with local IPv6 address $IPV6_ADDRESS"
    check_public_ip "$INTERFACE"
    fi
    fi
    return 0
    }

    if [[ -z "$ALIVE" ]]; then
    ALIVE="www.google.com"
    fi

    ETHERNET_INTERFACES=$(ip link | awk -F: '$0 !~ "lo|vir|wl|^[^0-9]"{print $2;getline}')

    for ETHERNET_INTERFACE in $ETHERNET_INTERFACES
    do
    echo "[*] Attempting Ethernet interface $ETHERNET_INTERFACE"
    timeout -k 5s 5s dhclient -r $ETHERNET_INTERFACE 2> /dev/null
    timeout -k 5s 5s dhclient $ETHERNET_INTERFACE 2> /dev/null
    if [[ $? -eq 0 ]]; then
    check_interface "$ETHERNET_INTERFACE"
    if [[ $? -eq 0 ]]; then
    echo "[*] Succcess for interface $ETHERNET_INTERFACE"
    ip link set "$ETHERNET_INTERFACE" down
    else
    echo "[-] Failure for interface $ETHERNET_INTERFACE"
    fi
    fi
    echo "[*] Ethernet Done"
    done

    WIFI_INTERFACES=$(iw dev | grep Interface | awk -F" " '{print $2}')

    for WIFI_INTERFACE in $WIFI_INTERFACES
    do
    echo "[*] Attempting WiFi interface $WIFI_INTERFACE"
    SSIDS=$(iw dev $WIFI_INTERFACE scan | grep "SSID:" | awk -F": " '{print $2}')
    while read -r SSID;
    do
    if [[ -z "$SSID" ]]; then
    continue
    fi
    NMCLI_OUTPUT=$(nmcli device wifi connect "$SSID") # 2>/dev/null
    if [[ $? -ne 0 ]] || [[ "$NMCLI_OUTPUT" = *"Secrets were required"* ]]; then
    continue
    fi
    timeout -k 5s 5s dhclient -r $WIFI_INTERFACE 2> /dev/null
    timeout -k 5s 5s dhclient $WIFI_INTERFACE 2>/dev/null
    if [[ $? -eq 0 ]]; then
    check_interface "$WIFI_INTERFACE"
    if [[ $? -eq 0 ]]; then
    echo "[-] SSID "'"'"$SSID"'"'" Succeeded for interface $WIFI_INTERFACE"
    nmcli con down "$SSID"
    fi
    fi
    done <<< "$SSIDS"
    done
    echo "[*] WiFi done"