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libcli libcli emulates a cisco style telnet command-line interface. To compile: make make install This will install libcli.so into /usr/local/lib. If you want to change the location, edit Makefile. There is a test application built called clitest. Run this and telnet to port 8000. By default, a single username and password combination is enabled. Username: fred Password: nerk Get help by entering "help" or hitting ?. libcli provides support for using the arrow keys for command-line editing. Up and Down arrows will cycle through the command history, and Left & Right can be used for editing the current command line. libcli also works out the shortest way of entering a command, so if you have a command "show users grep foobar" defined, you can enter "sh us g foobar" if that is the shortest possible way of doing it. Enter "sh?" at the command line to get a list of commands starting with "sh" A few commands are defined in every libcli program: help quit exit logout history Use in your own code: First of all, make sure you #include <libcli.h> in your C code, and link with -lcli. If you have any trouble with this, have a look at clitest.c for a demonstration. Start your program off with a cli_init(). This sets up the internal data structures required. When a user connects, they are presented with a greeting if one is set using the cli_set_banner(banner) function. By default, the command-line session is not authenticated, which means users will get full access as soon as they connect. As this may not be always the best thing, 2 methods of authentication are available. First, you can add username / password combinations with the cli_allow_user(username, password) function. When a user connects, they can connect with any of these username / password combinations. Secondly, you can add a callback using the cli_set_auth_callback(callback) function. This function is passed the username and password as char *, and must return CLI_OK if the user is to have access and CLI_ERROR if they are not. The library itself will take care of prompting the user for credentials. Commands are built using a tree-like structure. You define commands with the cli_register_command(parent, command, callback, privilege, mode, help) function. parent is a cli_command * reference to a previously added command. Using a parent you can build up complex commands. e.g. to provide commands "show users", "show sessions" and "show people", use the following sequence: cli_command *c = cli_register_command(NULL, "show", NULL, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, NULL); cli_register_command(c, "sessions", fn_sessions, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "Show the sessions connected"); cli_register_command(c, "users", fn_users, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "Show the users connected"); cli_register_command(c, "people", fn_people, PRIVILEGE_UNPRIVILEGED, MODE_EXEC, "Show a list of the people I like"); If callback is NULL, the command can be used as part of a tree, but cannot be individually run. If you decide later that you don't want a command to be run, you can call cli_unregister_command(command). You can use this to build dynamic command trees. It is possible to carry along a user-defined context to all command callbacks using cli_set_context(cli, context) and cli_get_context(cli) functions. You are responsible for accepting a TCP connection, and for creating a process or thread to run the cli. Once you are ready to process the connection, call cli_loop(cli, sock) to interact with the user on the given socket. This function will return when the user exits the cli, either by breaking the connection or entering "quit". Call cli_done() to free the data structures. - David Parrish (email@example.com)