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#### 6.2.1.2 Indirect Functions

These functions are called indirect because they connect to an intermediate host before actually connecting to the NNTP server. All of these functions and related variables are also said to belong to the “via” family of connection: they’re all prefixed with “via” to make things cleaner. The behavior of these functions is also affected by commonly understood variables (see Common Variables).

`nntp-open-via-rlogin-and-netcat`

  Does an ‘`rlogin`’ on a remote system, and then uses `netcat` to connect to the real NNTP server from there. This is useful for instance if you need to connect to a firewall machine first.

  `nntp-open-via-rlogin-and-netcat`-specific variables:

  `nntp-via-rlogin-command`

    Command used to log in on the intermediate host. The default is ‘`rsh`’, but ‘`ssh`’ is a popular alternative.

  `nntp-via-rlogin-command-switches`

    List of strings to be used as the switches to `nntp-via-rlogin-command`. The default is `nil`. If you use ‘`ssh`’ for `nntp-via-rlogin-command`, you may set this to ‘`("-C")`’ in order to compress all data connections.

`nntp-open-via-rlogin-and-telnet`

  Does essentially the same, but uses `telnet` instead of ‘`netcat`’ to connect to the real NNTP server from the intermediate host. `telnet` is a bit less robust because of things like line-end-conversion, but sometimes `netcat` is simply not available.

  `nntp-open-via-rlogin-and-telnet`-specific variables:

  `nntp-telnet-command`

    Command used to connect to the real NNTP server from the intermediate host. The default is ‘`telnet`’.

  `nntp-telnet-switches`

    List of strings to be used as the switches to the `nntp-telnet-command` command. The default is `("-8")`.

  `nntp-via-rlogin-command`

    Command used to log in on the intermediate host. The default is ‘`rsh`’, but ‘`ssh`’ is a popular alternative.

  `nntp-via-rlogin-command-switches`

    List of strings to be used as the switches to `nntp-via-rlogin-command`. If you use ‘`ssh`’, you may need to set this to ‘`("-t" "-e" "none")`’ or ‘`("-C" "-t" "-e" "none")`’ if the telnet command requires a pseudo-tty allocation on an intermediate host. The default is `nil`.

  Note that you may want to change the value for `nntp-end-of-line` to ‘`\n`’ (see Common Variables).

`nntp-open-via-telnet-and-telnet`

  Does essentially the same, but uses ‘`telnet`’ instead of ‘`rlogin`’ to connect to the intermediate host.

  `nntp-open-via-telnet-and-telnet`-specific variables:

  `nntp-via-telnet-command`

    Command used to `telnet` the intermediate host. The default is ‘`telnet`’.

  `nntp-via-telnet-switches`

    List of strings to be used as the switches to the `nntp-via-telnet-command` command. The default is ‘`("-8")`’.

  `nntp-via-user-password`

    Password to use when logging in on the intermediate host.

  `nntp-via-envuser`

    If non-`nil`, the intermediate `telnet` session (client and server both) will support the `ENVIRON` option and not prompt for login name. This works for Solaris `telnet`, for instance.

  `nntp-via-shell-prompt`

    Regexp matching the shell prompt on the intermediate host. The default is ‘`bash\\|\$ *\r?$\\|> *\r?`’.

  Note that you may want to change the value for `nntp-end-of-line` to ‘`\n`’ (see Common Variables).

Here are some additional variables that are understood by all the above functions:

`nntp-via-user-name`

  User name to use when connecting to the intermediate host.

`nntp-via-address`

  Address of the intermediate host to connect to.

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