1. Support user register and login.
2. Support files encrypted transmission.
3. Support client explore,upload and download files.
4. Multiple concurrent processing a large number of connections.
5. Support menu UI and command line two modes of operations.

In order to run the SFTP-SYS,the following program are needed:

1. openssl
2. sqlite3
3. readline

on Ubuntu,you can use sudo apt-get install command to install them. You can also install from source code.Download the source package and use the following command to install them.

	$ ./configure 
	$ make 
	$ make install 

1. Entry the SFTP-SYS/(root directory)and execute the make command.Then it will generate libsftpsys.a, ssl_server, ssl_client in lib/,server/,client/.

2. Entry the server/ directory and edit sftp-sys.conf,such as the following:

    #Sever network configure 
    
    # Server will use the localhost IP when 'INADDR_ANY' is on
    
    INADDR_ANY = off 
    
    # Assign a specify IP,and make sure the 'INADDR_ANY' is off.
    
    IP = 127.0.0.1
    PORT = 7838
    # Connection backlog
    
    LISTEN = 1000 
   

save the configure,and run ./ssl_server & 3. Entry the client/ directory and run ./ssl_client 127.0.0.1 7838. The default user and password are "Populus","123456".You can register a account by yourself.

Entry the server/certificate/ directory,you will see two files:privkey.pem (private key),cacert.pem(digital certificate).You can go back to the server/ ,run ./create_cert.sh to generate those files and copy to here.

The Server will generate a user directory under the server/User/ directory which according to the user name.This directory is the user space.User can only explore,upload and download files with this space.

On client,there a SFT_DOWNLOAD/ directory which use to receive the download files from the server.