libssh binding

By default used configuration ctlink for linking at compile time. You need instal libssh before building your application.

Configuration rtload implies that your application need load library at runtime by loadLibSSH() call. It may be useful for cross-compilation without need target libssh. For dynamic loading used ssll library.

    version (libssh_rtload)
    {
        loadLibSSH();
        scope (exit) unloadLibSSH();
    }

    auto s = ssh_new();

    ... // other libssh calls

Due to the mismatch between C and D direct copy-paste from C examples don't work, some constants placed as enum-lists and has redundant naming but some not:

// C code
ssh_options_set(session, SSH_OPTIONS_HOST, args[1]);
...
rc = ssh_channel_open_session(channel);
if (rc != SSH_OK) ...

// D code
ssh_options_set(session, ssh_options_e.SSH_OPTIONS_HOST, args[1].toStringz);
...
rc = ssh_channel_open_session(channel);
if (rc != SSH_OK) ...

For more comforable use added libssh/dconst.d file with definition of library constants.

// D code
ssh_options_set(my_ssh_session, SSH_OPTION.HOST, args[1].toStringz);
...
rc = ssh_channel_open_session(channel);
if (rc != SSH_RETCODE.OK) ...

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Used libssh headers from version 0.8.7.