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## 3. Display (`X` and the font servers)

Strictly speaking, it is not absolutely necessary to set up font servers to use TrueType fonts with `X` servers. If you wish to use static files instead of a font server, please see the instructions for setting up TrueType fonts for `ghostscript`.

## 3.1 Setting up the `xfs` Font Server

At this point I assume you have a working `/etc/X11/XF86Config` file that loads explicitly specifies each directory in the `FontPath`. We will convert it to use the `xfs` Font Server.

- Install `XFS`

  If you have not already done so, install `main/binary-*/x11/xfs_*.deb`.

- Configure `XFS`

  Edit `/etc/X11/xfs/config` and change the `catalogue` to contain the contents of your `FontList`. You may also wish to change the `default-resolutions` value.

  > `/etc/X11/xfs/config

  >     # paths to search for fonts
  >     catalogue =
  >         /usr/X11R6/lib/X11/fonts/100dpi/:unscaled,
  >         /usr/X11R6/lib/X11/fonts/75dpi/:unscaled,
  >         /usr/X11R6/lib/X11/fonts/misc/,
  >         /usr/X11R6/lib/X11/fonts/Speedo/,
  >         /usr/X11R6/lib/X11/fonts/Type1/,
  >         /usr/X11R6/lib/X11/fonts/100dpi/,
  >         /usr/X11R6/lib/X11/fonts/75dpi/
  >     # x1,y1,x2,y2,...
  >     default-resolutions = 100,100,75,75

  > `

- Restart `XFS`

  Restart `XFS` in the usual Debian manner:

  > `root shell

  >     # /etc/init.d/xfs restart

  > `

- Verify that `XFS` is working

  Before we change our `XF86Config` file, we should verify that the `xfs` server is working by listing them through the font server:

  > `user shell

  >     $ fslsfonts -server unix/:7100
  >     -adobe-courier-bold-i-normal--0-0-0-0-m-0-iso8859-1
  >     -adobe-courier-bold-o-normal--0-0-100-100-m-0-iso8859-1
  >     -adobe-courier-bold-o-normal--0-0-75-75-m-0-iso8859-1
  >     ....

  > `

- Change `/etc/X11/XF86Config` to use `xfs`

  We're now ready to tell the X server to use the `xfs` font server. We keep one static font path as a fallback position in case of a problem with `xfs`. (We keep "misc" since it contains `fixed`, the default font.)

  > `/etc/X11/XF86Config

  >     Section "Files"
  >         FontPath   "unix/:7100"
  >         FontPath   "/usr/X11R6/lib/X11/fonts/misc/"
  >     EndSection

  > `

- Restart `X`

  Restart `X` with `startx`, unless you like living life dangerously. If that's the case, name me the beneficiary of your unusually large life insurance policy and restart `xdm`.

- Verify that the `XFS` fonts are visible

  Once we have an X session established, we can verify that our server sees all of the `xfs` fonts by listing them through the `X` server.

  > `user shell

  >     $ xlsfonts
  >     -adobe-courier-bold-i-normal--0-0-0-0-m-0-iso8859-1
  >     -adobe-courier-bold-o-normal--0-0-100-100-m-0-iso8859-1
  >     -adobe-courier-bold-o-normal--0-0-75-75-m-0-iso8859-1
  >     ....

  > `

## 3.2 Setting up the `xfstt` Font Server and installing TrueType fonts

At this point I assume you have a working `xfs` font server and wish to add TrueType support via `xfstt`.

- Install `XFSTT`

  If you have not already done so, install `main/binary-*/x11/xfstt_*.deb`.

- Installing the TrueType Fonts

  Copy your TrueType fonts into the `/usr/share/fonts/truetype` directory. These files usually have a `.ttf` extension, and they should have `0444` permissions.

- Restart the `XFSTT` Font Server

  Restart the `xfstt` server with the `force-reload` flag

  > `root shell

  >     # /etc/init.d/xfstt force-reload

  > `

- Verify that `XFSTT` is working

  Before we change our `XF86Config` file, we should verify that the `xfstt` server is working.

  Important: the Debian `xfstt` server listens to port 7101, not 7100. Also, the default permissions will require you to run this query as root.

  > `user and root shells

  >     $ fslsfonts -server unix/:7101
  >     _FSTransSocketUNIXConnect: Can't connect: errno = 111
  >     fslsfonts:  unable to open server "unix/:7101"

  >     # fslsfonts -server unix/:7101
  >     -ttf-arial black-medium-r-normal-regular-0-0-0-0-p-0-iso8859-1
  >     -ttf-arial mt black-medium-r-normal-regular-0-0-0-0-p-0-iso8859-1
  >     -ttf-arial narrow-bold-i-normal-bold italic-0-0-0-0-p-0-iso8859-1

  > `

- Change `/etc/X11/XF86Config` to use `xfstt`

  We're now ready to tell the X server to use the `xfstt` font server. We want it to use TrueType fonts in preference to all others.

  > `/etc/X11/XF86Config

  >     Section "Files"
  >         FontPath   "unix/:7101"
  >         FontPath   "unix/:7100"
  >         FontPath   "/usr/X11R6/lib/X11/fonts/misc/"
  >     EndSection

  > `

- Verify that `XFSTT` fonts are visible

  Once we have an X session established, we can verify that our server sees all of the TrueType fonts by listing them.

  > `

  >     $ xlsfonts | grep ttf
  >     -ttf-arial black-medium-r-normal-regular-0-0-0-0-p-0-iso8859-1
  >     -ttf-arial mt black-medium-r-normal-regular-0-0-0-0-p-0-iso8859-1
  >     -ttf-arial narrow-bold-i-normal-bold italic-0-0-0-0-p-0-iso8859-1
  >     ....

  > `

## 3.3 Using TrueType fonts

At this point it should be possible to use a TrueType font in applications like `GIMP`, `Netscape` or `StarOffice`. Since most TrueType fonts aren't monospaced you probably don't want to use one of them with `xterm` - these programs use monospacing the size of the largest character cell.

## 3.4 Installing additional TrueType fonts

If you are using the `xfstt` font server, it's trivial to install additional TrueType fonts.

- Copy the new font(s) into `/usr/share/fonts/truetype/`
- Restart `xfs` with `/etc/init.d/xfs restart`

## 3.5 Internationalization

`xfstt` has the ability to generate multiple font encodings, provided that the TrueType font contains the necessary glyphs. To enable fonts other than iso8859-1/unicode-1, you must manually edit the `/etc/init.d/xfstt` script:

> `/etc/init.d/xfstt

>     - start-stop-daemon --start --quiet --exec $XFSTT -- \
>           --port $portno --daemon
>     + start-stop-daemon --start --quiet --exec $XFSTT -- \
>           --port $portno --encoding iso8859-1,koi8-r,windows-1252,symbol-0 \
>           --daemon

> `

The recognized encodings in Debian 2.1 are:

- iso8859-1 (Latin 1 - Western Europe)
- iso8859-2 (Latin 2 - Central and Eastern Europe)
- iso8859-3 (Latin 3 - Esperanto and Maltese)
- iso8859-4 (Latin 4 - superceded by Latin 6)
- iso8859-5 (Cyrillic)
- iso8859-6 (Arabic)
- iso8859-7 (Greek)
- iso8859-8 (Hebrew)
- iso8859-9 (Latin 5 - Latin 1 with Turkish, not Icelandic)
- iso8859-10 (Latin 6 - Nordic languages, replaces Latin 4)
- koi8-r (Cyrillic)
- windows-1250 (Central Europe)
- windows-1251 (Cyrillic)
- windows-1252
- windows-1253 (Greek)
- windows-1254
- windows-1255
- windows-1256
- windows-1257
- symbol-0
- wingding-0
- wingreek-0
- cp-437 (various IBM code pages)
- cp-737
- cp-850
- cp-851
- cp-852
- cp-853
- cp-855
- cp-857
- cp-860
- cp-861
- cp-862
- cp-863
- cp-864
- cp-865
- cp-866
- cp-869
- cp-895
- atari-st
- unicode-2

The first 128 characters in the `iso8859-x` encodings is always ASCII. The `windows-` fonts embrace and extend `iso8859-1` with additional characters such as "smart quotes." (Since these extensions, such as "smart quotes" are undefined in `iso8859-1`, they are usually rendered as question marks.)

Excellent source for additional information on character set encodings are at

- `http://ppewww.ph.gla.ac.uk/%7Eflavell/iso8859/iso8859-pointers.html`,
- `http://anubis.dkuug.dk/i18n/` and
- `http://czyborra.com/charsets/iso8859.html`.

## 3.6 Security Issues

I used Unix sockets above, but the standard Debian packages also configure `xfs` and `xfstt` to listen to TCP/IP ports 7100 and 7101, respectively. Access to these ports should be controlled by the `trusted-clients` field in `/etc/X11/xfs/config`, but this option is not implemented in XFree86 3.3.2.3a.

This means that anyone, anywhere, can connect to your font server. Since `xfs` (and presumably `xfsts`) "clone" to support more users there's a trivial denial-of-service attack against these systems. It's probably safe to use the font servers on dialup lines (since you're present to handle problems), but DSL and cable modem users should use a firewall.

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