Termux Connect (tercon)

Requirements §

1. openssh should be installed on both devices.
2. sshd daemon should be started on both devices.
3. To connect to linux on IP 192.168.1.1 on port 80.

 ssh -p 80 linux@192.168.1.1

Some useful commands. §

1. arp -v to see the connected devices on the network.
2. ifconfig wlan0 to find the ipaddress of your device.
3. whoami to find the username of your device
4. nmap localhost to see the running hosts on the localhost.
5. arp -a | awk '{print $2}' | tr -d "()" to see the IPaddress of all devices connected to the local network.

For more functionality §

1. Install termux-api and the Termux:API application to interact with android API.
2. Install shizuku and setup rish with Termux to use more functionalities provided by ADB.

Dependencies §

openssh
sshpass
fzf
gawk
nmap
arp
egrep
grep
netcat-openbsd

Script §

Connects termux with other devices via ssh, so tercon, move it to .local/bin

#!/bin/bash
 
# ╻┏┓╻╻╺┳╸
# ┃┃┗┫┃ ┃ 
# ╹╹ ╹╹ ╹ 
# config file
config_file="$HOME/.config/tercon/config.sh"
 
# sourcing config file.
source $config_file
 
# Clearing the screen
clear
echo "Scanning..."
 
# ╻ ╻┏━┓┏━┓╻┏━┓┏┓ ╻  ┏━╸┏━┓
# ┃┏┛┣━┫┣┳┛┃┣━┫┣┻┓┃  ┣╸ ┗━┓
# ┗┛ ╹ ╹╹┗╸╹╹ ╹┗━┛┗━╸┗━╸┗━┛
# Variables
arg1=$1
argf=$2
 
# full path of the file
if [ $argf ]; then
    arg2="$(readlink -f $argf)"
fi
 
# Devices ip list
if [ "$iplist" == "none" ]; then
    iplist="$(arp -a | awk '{print $2}' | tr -d "()")"
fi
 
# ┏━╸╻ ╻┏┓╻   ┏━╸╻╻  ┏━╸
# ┣╸ ┃ ┃┃┗┫   ┣╸ ┃┃  ┣╸ 
# ╹  ┗━┛╹ ╹   ╹  ╹┗━╸┗━╸
# Making a function that sends a file
function send () {
 
        if [ "$password" == "none" ]; then
                invoke="scp -P $port $arg2 $whoami@"
        else
                invoke="sshpass -p "$password" scp -P $port $arg2 $whoami@"
        fi
 
        # Iterating over the list of ip addresses.
        for item in $iplist
        do
 
            # Using "netcat-openbsd" to see if the ssh port is available.
            nc -w 2 $item $port
 
            if [ $? -eq 0 ]
            then
                # Echoing out the available IP.
                echo "IP: $item"
                break
            fi
 
        done
 
        # Running the command to send the file
        $invoke$item:$send_path
 
        # Sending the file to another path.
        if [ "$send_path2" != "none" ]; then
 
            $invoke$item:$send_path2
 
        fi
 
}
 
# ┏━╸╻ ╻┏┓╻   ┏━┓┏━╸┏┓╻╺┳┓
# ┣╸ ┃ ┃┃┗┫   ┗━┓┣╸ ┃┗┫ ┃┃
# ╹  ┗━┛╹ ╹   ┗━┛┗━╸╹ ╹╺┻┛
# Making a function that connects to sftp.
function file () {
 
        if [ "$password" == "none" ]; then
                invoke="sftp -p $port $whoami@"
        else
                invoke="sshpass -p "$password" sftp -P $port $whoami@"
        fi
 
        # Iterating over the list of ip addresses.
        for item in $iplist
        do
 
            # Using "netcat-openbsd" to see if the ssh port is available.
            nc -w 2 $item $port
 
            if [ $? -eq 0 ]
            then
                # Echoing out the available IP.
                echo "IP: $item"
                break
            fi
 
        done
 
        # Running the command to connect to sftp
        $invoke$item
        
}
 
# ┏━┓┏━╸┏┓╻╺┳┓
# ┗━┓┣╸ ┃┗┫ ┃┃
# ┗━┛┗━╸╹ ╹╺┻┛
# If the second argument is "send" use function send.
if [ "$arg1" == "send" ]; then
 
    if [ -f "$arg2" ]; then
            send
            echo "Sucessfully Sent! $argf"
    else
            echo "Sending $argf failed!"
            exit
    fi
    exit
 
# ┏━╸╻╻  ┏━╸
# ┣╸ ┃┃  ┣╸ 
# ╹  ╹┗━╸┗━╸
# If the second argument is "file" use function file.
elif [[ "$arg1" == "file" ]]; then
    
    file
    exit
 
fi
 
# ┏┳┓┏━┓╻┏┓╻
# ┃┃┃┣━┫┃┃┗┫
# ╹ ╹╹ ╹╹╹ ╹
# The command that should run to connect to ssh.
 
main () {
 
        if [ "$password" == "none" ]; then
            invoke="ssh -p $port -o StrictHostKeyChecking=no $whoami@"
        else
            invoke="sshpass -p "$password" ssh -p $port -o StrictHostKeyChecking=no $whoami@"
        fi
 
        # Iterating over each line from $iplist, which consists of the IP addresses that
        # are working on the local network.
        # and cheching if the ssh port is available to connect.
        for item in $iplist
        do
 
        # Using "netcat-openbsd" to see if the ssh port is available.
        nc -w 2 $item $port
 
        if [ $? -eq 0 ]
        then
            # Echoing out the available IP.
            echo "IP: $item"
            break
        fi
 
        done
 
        # Running the command to connect to ssh
        $invoke$item
 
}
 
main
 

Config file §

Configuration file for tercon, move it to .config/tercon/config.sh

# Username on Termux
whoami="linux"
 
# Password on Termux (Don't set password for better security)
# To make it ask for password to connect.
password="<password>" # Comment this line and uncomment the line below.
# password="none"
 
# Port in which the sshd daemon is running,
port="80"
 
# set if the ip is static
iplist="none"
# iplist="192.168.1.01"
 
# path on termux to send the file to.
send_path="tercon/recieved/"
# Second send path.
send_path2="storage/shared/Applications/Termux/shared/"
# send_path2="none"

Usage §

1. To connect to ssh, just type tercon.
2. To send files, type tercon send <filename_having_no_spaces>. Currently files with space in their names are unsupported.
3. To get into file transfer sftp mode, type tercon file , and use get and put commands to send and receive files.