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.\" ========================================================================
.\"
.IX Title "Sendmail::PMilter::Context 3pm"
.TH Sendmail::PMilter::Context 3pm "2011-04-18" "perl v5.10.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Sendmail::PMilter::Context \- per\-connection milter context
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
A Sendmail::PMilter::Context is the context object passed to milter callback
functions as the first argument, typically named \*(L"$ctx\*(R" for convenience.  
This manual explains publicly accessible operations on \f(CW$ctx\fR.
.SH "METHODS"
.IX Header "METHODS"
.ie n .IP "$ctx\->getpriv" 4
.el .IP "\f(CW$ctx\fR\->getpriv" 4
.IX Item "$ctx->getpriv"
Returns the private data object for this milter instance, set by
\&\f(CW$ctx\fR\->\fIsetpriv()\fR (see below).  Returns undef if setpriv has never been called
by this milter instance.
.ie n .IP "$ctx\->getsymval(\s-1NAME\s0)" 4
.el .IP "\f(CW$ctx\fR\->getsymval(\s-1NAME\s0)" 4
.IX Item "$ctx->getsymval(NAME)"
Retrieves the macro symbol named \s-1NAME\s0 from the macros available from the \s-1MTA\s0
for the current callback.  This typically consists of a one-letter macro
name, or a multi-letter macro name enclosed in {curly braces}.  If the
requested macro was not defined by the \s-1MTA\s0 ny the time getsymval is called,
returns undef.
.Sp
Some common macros include the following.  (Since milter is a protocol first
implemented in the Sendmail \s-1MTA\s0, the macro names are the same as those in
Sendmail itself.)
.RS 4
.ie n .IP "$ctx\->getsymval('_')" 2
.el .IP "\f(CW$ctx\fR\->getsymval('_')" 2
.IX Item "$ctx->getsymval('_')"
The remote host name and address, in standard \s-1SMTP\s0 \*(L"name [address]\*(R" form.
.ie n .IP "$ctx\->getsymval('i')" 2
.el .IP "\f(CW$ctx\fR\->getsymval('i')" 2
.IX Item "$ctx->getsymval('i')"
The \s-1MTA\s0's queue \s-1ID\s0 for the current message.
.ie n .IP "$ctx\->getsymval('j')" 2
.el .IP "\f(CW$ctx\fR\->getsymval('j')" 2
.IX Item "$ctx->getsymval('j')"
The \s-1MTA\s0's idea of local host name.
.ie n .IP "$ctx\->getsymval('{if_addr}')" 2
.el .IP "\f(CW$ctx\fR\->getsymval('{if_addr}')" 2
.IX Item "$ctx->getsymval('{if_addr}')"
The local address of the network interface upon which the connection was
received.
.ie n .IP "$ctx\->getsymval('{if_name}')" 2
.el .IP "\f(CW$ctx\fR\->getsymval('{if_name}')" 2
.IX Item "$ctx->getsymval('{if_name}')"
The local hostname of the network interface upon which the connection was
received.
.ie n .IP "$ctx\->getsymval('{mail_addr}')" 2
.el .IP "\f(CW$ctx\fR\->getsymval('{mail_addr}')" 2
.IX Item "$ctx->getsymval('{mail_addr}')"
The \s-1MAIL\s0 \s-1FROM:\s0 sender's address, canonicalized and angle bracket stripped.
(This is typically not the same value as the second argument to the
\&\*(L"envfrom\*(R" callback.)  Will be defined to the empty string '' if the client
issued a \s-1MAIL\s0 FROM:<> null return path command.
.ie n .IP "$ctx\->getsymval('{rcpt_addr}')" 2
.el .IP "\f(CW$ctx\fR\->getsymval('{rcpt_addr}')" 2
.IX Item "$ctx->getsymval('{rcpt_addr}')"
The \s-1RCPT\s0 \s-1TO:\s0 recipient's address, canonicalized and angle bracket stripped.
(This is typically not the same value as the second argument to the
\&\*(L"envrcpt\*(R" callback.)
.RE
.RS 4
.Sp
Not all macros may be available at all times, of course.  Some macros are
only available after a specific phase is reached, and some macros may only
be available from certain \s-1MTA\s0 implementations.  Care should be taken to
check for undef returns in order to cover these cases.
.RE
.ie n .IP "$ctx\->setpriv(\s-1DATA\s0)" 4
.el .IP "\f(CW$ctx\fR\->setpriv(\s-1DATA\s0)" 4
.IX Item "$ctx->setpriv(DATA)"
This is the place to store milter-private data that is sensitive to the
current \s-1SMTP\s0 client connection.  Only one value can be stored, so typically
an arrayref or hashref is initialized in the \*(L"connect\*(R" callback and set with
\&\f(CW$ctx\fR\->setpriv.
.Sp
This value can be retrieved on subsequent callback runs with \f(CW$ctx\fR\->getpriv.
.ie n .IP "$ctx\->setreply(\s-1RCODE\s0, \s-1XCODE\s0, \s-1MESSAGE\s0)" 4
.el .IP "\f(CW$ctx\fR\->setreply(\s-1RCODE\s0, \s-1XCODE\s0, \s-1MESSAGE\s0)" 4
.IX Item "$ctx->setreply(RCODE, XCODE, MESSAGE)"
Set an extended \s-1SMTP\s0 status reply (before returning \s-1SMFIS_REJECT\s0 or
\&\s-1SMFIS_TEMPFAIL\s0).  \s-1RCODE\s0 should be a short (4xx or 5xx) numeric reply code,
\&\s-1XCODE\s0 should be a long ('4.x.x' or '5.x.x') \s-1ESMTP\s0 reply code, and \s-1MESSAGE\s0 is
the full text of the message to send.  Example:
.Sp
.Vb 2
\&        $ctx\->setreply(451, \*(Aq4.7.0\*(Aq, \*(AqCannot authenticate you right now\*(Aq);
\&        return SMFIS_TEMPFAIL;
.Ve
.Sp
Note that after setting a reply with this method, the \s-1SMTP\s0 result code comes
from \s-1RCODE\s0, not the difference between \s-1SMFIS_REJECT\s0 or \s-1SMFIS_TEMPFAIL\s0.  
However, for consistency, callbacks that set a 4xx response code should use
\&\s-1SMFIS_TEMPFAIL\s0, and those that set a 5xx code should return \s-1SMFIS_REJECT\s0.
.Sp
Returns a true value on success, undef on failure.  In the case of failure,
typically only caused by bad parameters, a generic message will still be
sent based on the SMFIS_* return code.
.ie n .IP "$ctx\->\fIshutdown()\fR" 4
.el .IP "\f(CW$ctx\fR\->\fIshutdown()\fR" 4
.IX Item "$ctx->shutdown()"
A special case of \f(CW\*(C`$ctx\->setreply()\*(C'\fR which sets the short numeric reply 
code to 421 and the \s-1ESMTP\s0 code to 4.7.0.  Under Sendmail 8.13 and higher, 
this will close the \s-1MTA\s0's communication channel quickly, which should 
immediately result in a \*(L"close\*(R" callback and end of milter execution. 
(However, Sendmail 8.11\-8.12 will treat this as a regular 4xx error and 
will continue processing the message.)
.Sp
Always returns a true value.
.Sp
This method is an extension that is not available in the standard 
Sendmail::Milter package.
.ie n .IP "$ctx\->addheader(\s-1HEADER\s0, \s-1VALUE\s0)" 4
.el .IP "\f(CW$ctx\fR\->addheader(\s-1HEADER\s0, \s-1VALUE\s0)" 4
.IX Item "$ctx->addheader(HEADER, VALUE)"
Add header \s-1HEADER\s0 with value \s-1VALUE\s0 to this mail.  Does not change any
existing headers with the same name.  Only callable from the \*(L"eom\*(R" callback.
.Sp
Returns a true value on success, undef on failure.
.ie n .IP "$ctx\->addrcpt(\s-1ADDRESS\s0)" 4
.el .IP "\f(CW$ctx\fR\->addrcpt(\s-1ADDRESS\s0)" 4
.IX Item "$ctx->addrcpt(ADDRESS)"
Add address \s-1ADDRESS\s0 to the list of recipients for this mail.  Only callable
from the \*(L"eom\*(R" callback.
.Sp
Returns a true value on success, undef on failure.
.ie n .IP "$ctx\->chgheader(\s-1HEADER\s0, \s-1INDEX\s0, \s-1VALUE\s0)" 4
.el .IP "\f(CW$ctx\fR\->chgheader(\s-1HEADER\s0, \s-1INDEX\s0, \s-1VALUE\s0)" 4
.IX Item "$ctx->chgheader(HEADER, INDEX, VALUE)"
Change the \s-1INDEX\s0'th header of name \s-1HEADER\s0 to the value \s-1VALUE\s0.  Only callable
from the \*(L"eom\*(R" callback.
.Sp
Returns a true value on success, undef on failure.
.ie n .IP "$ctx\->delrcpt(\s-1ADDRESS\s0)" 4
.el .IP "\f(CW$ctx\fR\->delrcpt(\s-1ADDRESS\s0)" 4
.IX Item "$ctx->delrcpt(ADDRESS)"
Remove address \s-1ADDRESS\s0 from the list of recipients for this mail.  The
\&\s-1ADDRESS\s0 argument must match a prior argument to the \*(L"envrcpt\*(R" callback
exactly (case sensitive, and including angle brackets if present).  Only
callable from the \*(L"eom\*(R" callback.
.Sp
Returns a true value on success, undef on failure.  A success return does
not necessarily indicate that the recipient was successfully removed, but
rather that the command was queued for processing.
.ie n .IP "$ctx\->\fIprogress()\fR" 4
.el .IP "\f(CW$ctx\fR\->\fIprogress()\fR" 4
.IX Item "$ctx->progress()"
Sends an asynchronous \*(L"progress\*(R" message to the \s-1MTA\s0, which should reset 
the \s-1MTA\s0's internal communications timer.  This can allow longer than 
normal operations, such as a deliberate delay, to continue running without 
dropping the milter-MTA connection.  This command can be issued at any 
time during any callback, although issuing it during a \*(L"close\*(R" callback 
may trigger socket connection warnings in Perl.
.Sp
Always returns a true value.
.Sp
This method is an extension that is not available in the standard 
Sendmail::Milter package.
.ie n .IP "$ctx\->quarantine(\s-1REASON\s0)" 4
.el .IP "\f(CW$ctx\fR\->quarantine(\s-1REASON\s0)" 4
.IX Item "$ctx->quarantine(REASON)"
Quarantine the current message in the MTA-defined quarantine area, using 
the given \s-1REASON\s0 as a text string describing the quarantine status.  Only 
callable from the \*(L"eom\*(R" callback.
.Sp
Returns a true value on success, undef on failure.
.Sp
This method is an extension that is not available in the standard 
Sendmail::Milter package.
.ie n .IP "$ctx\->replacebody(\s-1BUFFER\s0)" 4
.el .IP "\f(CW$ctx\fR\->replacebody(\s-1BUFFER\s0)" 4
.IX Item "$ctx->replacebody(BUFFER)"
Replace the message body with the data in \s-1BUFFER\s0 (a scalar).  This method
may be called multiple times, each call appending to the replacement buffer.  
End-of-line should be represented by CR-LF (\*(L"\er\en\*(R").  Only callable from the
\&\*(L"eom\*(R" callback.
.Sp
Returns a true value on success, undef on failure.
.ie n .IP "$ctx\->setsender(\s-1ADDRESS\s0)" 4
.el .IP "\f(CW$ctx\fR\->setsender(\s-1ADDRESS\s0)" 4
.IX Item "$ctx->setsender(ADDRESS)"
Replace the envelope sender address for the given mail message.  This
method provides an implementation to access the mlfi_setsender method
added to the libmilter library as part of the mlfi-setsender project 
(http://www.sourceforge.net/projects/mlfi\-setsender).
.Sp
Returns a true value on success, undef on failure.  A success return does
not necessarily indicate that the recipient was successfully removed, but
rather that the command was queued for processing.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Sendmail::PMilter