1.1 --- a/thesis/tex/4-MasqmailsFuture.tex	Wed Dec 10 18:52:09 2008 +0100
     1.2 +++ b/thesis/tex/4-MasqmailsFuture.tex	Wed Dec 10 21:12:09 2008 +0100
     1.3 @@ -1,41 +1,65 @@
     1.4  \chapter{\masqmail's present and future}
     1.5  
     1.6 -\section{Existing features}
     1.7 -This overview regards \masqmail\ version 0.2.21, the state this document starts off.
     1.8 +\section{Existing code base}
     1.9 +Here regarded is version 0.2.21 of \masqmail. This is the last version released by \person{Oliver Kurth}, and the basis for my thesis.
    1.10  
    1.11 -\masqmail\ is an \MTA, therefor it accepts mail on the command line and via \SMTP. Mail queueing and alias expansion is supported. \masqmail\ is able to deliver mail to local mailboxes (in \name{mbox} or \name{maildir} format) or pass it to a \name{mail delivery agent} (like \name{procmail}). Mail destinated to remote locations is sent via \SMTP. Outgoing \SMTP\ connections feature \name{SMTP-Auth} and \name{SMTP-after-POP} authentication, but incoming \SMTP\ does not.
    1.12 +\subsubsection*{Features}
    1.13  
    1.14 -As \masqmail\ is focused on non-permanent Internet connections, online state can be queried by three methods: reading from a file, reading the output of a command, or by asking an \name{mserver}. Each method may return a string indicating one of the available routes being online, or returning nothing to indicate offline state.
    1.15 +\masqmail\ accepts mail on the command line and via \SMTP. Mail queueing and alias expansion is supported. \masqmail\ is able to deliver mail to local mailboxes (in \name{mbox} or \name{maildir} format) or pass it to a \name{mail delivery agent} (like \name{procmail}). Mail destinated to remote locations is sent using \SMTP.
    1.16  
    1.17 -Delivery to recipients on the local host or in local nets is done at once; delivery to recipients on the Internet is only done when being online, and queued otherwise. Each online route may have a different mail server to which mail is relayed. Return address headers are modified appropriate if wished.
    1.18 +Outgoing \SMTP\ connections feature \SMTP-\NAME{AUTH} and \SMTP-after-\NAME{POP} authentication, but incoming \SMTP\ does not.
    1.19 +%todo: what about SSL/TLS encryption?
    1.20  
    1.21 -Additional to the \mta\ job, \masqmail\ also offers mail retrieval services with being a \NAME{POP3} client. Thus it can fetch mail from remote locations, dependent on the active online route.
    1.22 -
    1.23 -
    1.24 -
    1.25 -The \masqmail\ executable can be called under various names for \name{sendmail-compatibility} reasons. This is commonly organized by creating symbolic links with with different names to the \masqmail\ executable. These are \path{/usr/lib/sendmail} and \path{/usr/sbin/sendmail} because many programs expect a \mta\ to be located there. Further more \sendmail\ provides shortcuts by calling it with a different name instead of supplying command line arguments. The best known of it is \path{mailq}, which is equivilent to calling the \MTA\ with the argument \verb+-bq+. \masqmail\ reacts to the names \path{mailq}, \path{smtpd}, \path{mailrm}, \path{runq}, \path{rmail}, and \path{in.smtpd}. The last four are an addition to \sendmail. Not implemented is the name \path{newaliases} because it is not relevant to \masqmail. To provide the command nonetheless, one may write a shell script located at \path{/usr/bin/newaliases}, that simply invokes \verb+masqmail -bi+.
    1.26 -
    1.27 +The \masqmail\ executable can be called under various names for sendmail-compatibility reasons. This is organized by symbolic links with different names pointing to the \masqmail\ executable. The \sendmail\ names are \path{/usr/lib/sendmail} and \path{/usr/sbin/sendmail} because many programs expect the \mta\ to be located there. Further more \sendmail\ supports calling it with a different name instead of supplying command line arguments. The best known of this shortcuts is \path{mailq}, which is equivilent to calling it with the argument \verb+-bq+. \masqmail\ recognizes the names \path{mailq}, \path{smtpd}, \path{mailrm}, \path{runq}, \path{rmail}, and \path{in.smtpd}. The first two are inspired by \sendmail. Not implemented is the name \path{newaliases} because \masqmail\ does not generate binary representations of the alias file.\footnote{A shell script located named \path{newaliases}, that invokes \texttt{masqmail -bi}, can provide the command to satisfy other software needing it.} \path{hoststat} and \path{purgestat} are missing for sendmail-compatibility.
    1.28  %masqmail: mailq, mailrm, runq, rmail, smtpd/in.smtpd
    1.29  %sendmail: hoststat, mailq, newaliases, purgestat, smtpd
    1.30  
    1.31 -\masqmail\ is written in the \NAME{C} programming language. The program, as of version 0.2.21, consists of 34 source code and eight header files, containing about 9,000 lines of code\footnote{Measured with \name{sloccount} by David A.\ Wheeler.}. Additionally, it includes a \name{base64} implementation (about 300 lines) and \name{md5} code (about 150 lines). For systems that do not provide \name{libident}, this library is distributed as well (circa 600 lines); an available shared library however has higher precedence in linking.
    1.32 +Additional to the \mta\ job, \masqmail\ also offers mail retrieval services with being a \NAME{POP3} client. It can fetch mail from different remote locations, dependent on the active online route.
    1.33  
    1.34 -The only mandatory dependency is \name{glib}---a cross-platform software utility library, originated in the \NAME{GTK+} project. It provides safer replacements for many standard library functions. (The unsafe \verb+sprintf()+ is one example.) Also it offers handy data containers, easy-to-use implementations of data structures, and much more.
    1.35 +
    1.36 +
    1.37 +\subsubsection*{The code}
    1.38 +
    1.39 +\masqmail\ is written in the C programming language. The program, as of version 0.2.21, consists of 34 source code and eight header files, containing about 9,000 lines of code\footnote{Measured with \name{sloccount} by David A.\ Wheeler.}. Additionally, it includes a \name{base64} implementation (about 300 lines) and \name{md5} code (about 150 lines). For systems that do not provide \name{libident}, this library is distributed as well (circa 600 lines); an available shared library however has higher precedence in linking.
    1.40 +
    1.41 +The only mandatory dependency is \name{glib}---a cross-platform software utility library, originated in the \NAME{GTK+} project. It provides safer replacements for many standard library functions. It also offers handy data containers, easy-to-use implementations of data structures, and much more.
    1.42 +
    1.43  
    1.44  With \masqmail\ comes the small tool \path{mservdetect}; it helps setting up a configuration that uses the \name{mserver} system to detect the online state. Two other binaries get compiled for testing purposes: \path{readtest} and \path{smtpsend}. All three programms use \masqmail\ source code; they only add a file with a \verb+main()+ function each.
    1.45  
    1.46 -\masqmail\ does not provide an interface for modules with additional functionality. There exists no add-on or module system. But the code is separated by function to the various source files, and some functional parts can be included or excluded by defining symbols. This means adding some argument (like \verb+--enable-maildir+) to the \verb+configure+ call. Thus the concerning code gets not removed by the preprocessor.
    1.47  
    1.48 +\masqmail\ does not provide an interface to plug in modules with additional functionality. There exists no add-on or module system. The code is only separated by function to the various source files. Some functional parts can be included or excluded by defining symbols. Adding maildir support at compile time, means giving the option \verb+--enable-maildir+ to the \path{configure} call. This preserves the concerning code to get removed by the preprocessor. Unfortunately the \verb+#ifdef+s are scattered through all the source, leading to a FIXME(holperig) code base.
    1.49  
    1.50  
    1.51  
    1.52  
    1.53 -\section{Discussion/Ideas}
    1.54  
    1.55 +\section{Directions to go}
    1.56  
    1.57  <<  plans to get masqmail more popular again (if that is the goal) >> %FIXME
    1.58  
    1.59  
    1.60 +\subsection{\masqmail\ in five years}
    1.61 +
    1.62 +Now how could \masqmail\ be like in, say, five years?
    1.63 +
    1.64 +<< requirements >> %FIXME
    1.65 +
    1.66 +<< which parts to do >> %FIXME
    1.67 +
    1.68 +<< how to make masqmail future-safe >> %FIXME
    1.69 +
    1.70 +<< how to advertise masqmail >> %FIXME
    1.71 +
    1.72 +<< why is it worth to revive masqmail? >> %FIXME
    1.73 +
    1.74 +
    1.75 +
    1.76 +<<  concrete decisions based on results of the last 2 chapters >> %FIXME
    1.77 +
    1.78 +
    1.79 +
    1.80 +
    1.81  \subsection{Architecture}
    1.82  
    1.83  << architecture diagram >>
    1.84 @@ -77,30 +101,12 @@
    1.85  
    1.86  
    1.87  
    1.88 -<<  concrete decisions based on results of the last 2 chapters >> %FIXME
    1.89  
    1.90  
    1.91  
    1.92  
    1.93  
    1.94  
    1.95 -\section{Directions to go}
    1.96 -
    1.97 -\subsection{\masqmail\ in five years}
    1.98 -\label{sec:masqmail-in-5-years}
    1.99 -Now how could \masqmail\ be like in, say, five years?
   1.100 -
   1.101 -<< requirements >> %FIXME
   1.102 -
   1.103 -<< which parts to do >> %FIXME
   1.104 -
   1.105 -<< how to make masqmail future-safe >> %FIXME
   1.106 -
   1.107 -<< how to advertise masqmail >> %FIXME
   1.108 -
   1.109 -<< difference for free software >> %FIXME
   1.110 -
   1.111 -<< why is it worth to revive masqmail? >> %FIXME
   1.112  
   1.113  
   1.114