InfoMagic Internet Tools 1993 July/Internet Tools.iso/RockRidge/mail/sendmail/sendmail-5.65c+IDA-1.4.4.1/ida/charset/Install

Internet Message Format | 1991-04-03 | 5.0 KB

Date: Thu, 28 Mar 91 13:50:22 +0100
From: Keld J|rn Simonsen <[e-mail]>
To: [e-mail]
Subject: Installation and Configuration Guide
X-Charset: ASCII
X-Char-Esc: 29

Multiple character set support in sendmail is provided by this
package.

These patches provide support for non-ASCII character sets in
sendmail.  About 90 7- and 8-bit character sets are supported,
including the ISO 8859 character sets, PC codepages, and Mac character
set.  Actually almost all of the so-called ECMA collection of
character sets is covered, plus many vendor defined character sets.

Messages are converted to ASCII for transmission, so full
interoperability and transparancy is guaranteed.  It should be noted
that sending out 8-bit characters in SMTP is a violation of current
RFC standards and it will create quite unintelligible messages on many
systems.

The conversion to ASCII is done with a mnemonic representation.
Recipients without special software will be able to read the message.
The conversion is fully reversible without information loss, so if
the receiver has sufficient software and hardware, the message can be
displayed in the right way.

A conversion filter program 'conv', together with the pager in the
mail user agent, provides rudimentary support when the hardware is
available for the recipient.

When mutual agreement has been achieved between two communicating
systems, these patches can also be used to transmit 8-bit character
sets.  This is useful for instance between UUCP sites, or between
cooperating sites that send 8-bit mail out over SMTP.


    Installation of character set support patches to sendmail

[ These and the IDA patches have already been applied to the sendmail
  sources.  The character set conversion code is enabled by setting
  #define BIT8 in conf.h  -pbp]

The patches have been used for sendmail 5.61, 5.64 and 5.65.  They
will most likely also work on later sendmail versions.

IDA patches are required.

The sendmail patches requires prior installation of the character
set conversion package.  This currently consist of two shar files:
ch.shar01 and ch.shar02.  Create a source directory for these and
unshar, make and make install the shar files.  Default installation
is in /usr/lib/char, /usr/lib and /usr/include, so you need sufficient
privileges for these catalogues.  The 'conv' program is not installed
anywhere, but could be copied to /usr/local/bin or similar places
for public access.

[ In this package, /usr/lib/char is rename to /usr/local/lib/mail/char. ]

Then apply the sendmail patches to the source of sendmail, and
remake and reinstall sendmail.


Configuration

In the ida/cf/Sendmail.mc file, define the local mailer to use the
internal character set of your machine.  If this is, for example,
ISO 8859-1 (LATIN1) it could be done by:

Mlocal,    P=/bin/mail, F=DFMSlmnrs,    A=mail -d $u, C=LATIN1, X=29

Valid character set names, and what encodings they cover, are listed
in the file CHARSETS.  The character set is specified with the "C="
option in the Mailer definition.  Case is not significant.

The last parameter above is the compose character for specifying
out-of-band characters.  This can be "&" or a control character.
The default is ASCII decimal 29 (035, GS), which has the advantage
of being invisible in the 'more' and 'page' pagers (but not in 'less').
The compose character is given by the option "X=" followed by the decimal
ASCII (or other character set) value.

If special arrangements have been made with adjacent UUCP or SMTP sites
to allow 8bit messages, mailers for them are specified similar to these
examples.

MUUCP,   P=/usr/bin/uux, F=CDFMUVSpu, S=19, R=19,    A=uux - -z -r $h!rmail ($u),C=ASCII,X=29
MUUCP-L1, P=/usr/bin/uux, F=CDFMUSpu, S=19/0, R=19/0, A=uux - -z -r $h!rmail ($u),C=latin1, X=29
MUUCP-850, P=/usr/bin/uux, F=CDFMUSpu, S=19/0, R=19/0, A=uux - -z -r $h!rmail ($u),C=CP850, X=29

MTCP,   P=[IPC], F=CDFMXhnmpu, E=\r\n, A=IPC $h,C=ASCII,X=29
MTCP-L1, P=[IPC], F=CDFMXhnmpu, E=\r\n, A=IPC $h,C=LATIN1,X=29
MTCP-850, P=[IPC], F=CDFMXhnmpu, E=\r\n, A=IPC $h,C=CP850,X=29

Use mailertable to declare the appropriate mailer for those sites.


Modifications to IDA sendmail consist of:

1. New mailer definitions: C for character set, and X for escape char
in decimal.  Appropriate changes to headers.c and sendmail.h .

2. In collect.c the appropiate mailer for the incoming mail is found
and if the header "X-Charset" or "X-Char-Esc" is found, these are
used instead. The header is untouched. The body is converted from
the found charset to ascii, which is the internal char set of sendmail.

3. In deliver.c  the receiving mailer is determined and the
corresponding charset is found. This is written with two
new headers, or if they exist, the old headers are revised.
Then the body of the message is converted from ascii to
the receiving character set.

4. A new routine findheader() has been added in headers.c for locating
and modifying a header.

5. The rutine sfgets() in util.c has been changed to allow 8-bit data.

[e-mail] 1991-03-24
(revised [e-mail], 1991-04-03)