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diff --git a/contrib/sendmail/libmilter/docs/xxfi_negotiate.html b/contrib/sendmail/libmilter/docs/xxfi_negotiate.html new file mode 100644 index 0000000..0f69f70 --- /dev/null +++ b/contrib/sendmail/libmilter/docs/xxfi_negotiate.html @@ -0,0 +1,277 @@ +<HTML> +<HEAD><TITLE>xxfi_negotiate</TITLE></HEAD> +<BODY> +<!-- +$Id: xxfi_negotiate.html,v 1.23 2006/12/20 18:57:08 ca Exp $ +--> +<H1>xxfi_negotiate</H1> + +<TABLE border="0" cellspacing=4 cellpadding=4> +<!---------- Synopsis -----------> +<TR><TH valign="top" align=left width=100>SYNOPSIS</TH><TD> +<PRE> +#include <libmilter/mfapi.h> +#include <libmilter/mfdef.h> +sfsistat (*xxfi_negotiate)( + SMFICTX *ctx, + unsigned long f0, + unsigned long f1, + unsigned long f2, + unsigned long f3, + unsigned long *pf0, + unsigned long *pf1, + unsigned long *pf2, + unsigned long *pf3); +</PRE> +</TD></TR> +<!----------- Description ----------> +<TR><TH valign="top" align=left>DESCRIPTION</TH><TD> +<TABLE border="1" cellspacing=1 cellpadding=4> +<TR> +<TH valign="top" align=left width=80>Called When</TH> +<TD>Once, at the start of each SMTP connection.</TD> +</TR> +<TR> +<TH valign="top" align=left width=80>Default Behavior</TH> +<TD>Return SMFIS_ALL_OPTS to change nothing.</TD> +</TR> +</TABLE> +<!----------- Arguments ----------> +<TR><TH valign="top" align=left>ARGUMENTS</TH><TD> + <TABLE border="1" cellspacing=0> + <TR bgcolor="#dddddd"><TH>Argument</TH><TH>Description</TH></TR> + <TR><TD>ctx</TD> + <TD>the opaque context structure. + </TD></TR> + <TR><TD>f0</TD> + <TD>the actions offered by the MTA. + </TD></TR> + <TR><TD>f1</TD> + <TD>the protocol steps offered by the MTA. + <TR><TD>f2</TD> + <TD>for future extensions. + </TD></TR> + <TR><TD>f3</TD> + <TD>for future extensions. + </TD></TR> + <TR><TD>pf0</TD> + <TD>the actions requested by the milter. + </TD></TR> + <TR><TD>pf1</TD> + <TD>the protocol steps requested by the milter. + <TR><TD>pf2</TD> + <TD>for future extensions. + </TD></TR> + <TR><TD>pf3</TD> + <TD>for future extensions. + </TD></TR> + </TABLE> +</TD></TR> + +<!----------- Return values ----------> +<TR> +<TH valign="top" align=left>SPECIAL RETURN VALUES</TH> +<TD><TABLE border="1" cellspacing=0> + <TR bgcolor="#dddddd"><TH>Return value</TH><TH>Description</TH></TR> + <TR valign="top"> + <TD>SMFIS_ALL_OPTS</TD> + <TD> +If a milter just wants to inspect the available protocol steps +and actions, then it can return +SMFIS_ALL_OPTS +and the MTA will make all protocol steps and actions available +to the milter. +In this case, no values should be assigned to the output parameters +<CODE>pf0</CODE> - <CODE>pf3</CODE> +as they will be ignored. + </TD> + </TR> + <TR valign="top"> + <TD>SMFIS_REJECT</TD> + <TD>Milter startup fails and it will not be contacted again +(for the current connection). + </TD> + </TR> + <TR valign="top"> + <TD>SMFIS_CONTINUE</TD> + <TD>Continue processing. + In this case the milter <EM>must</EM> set all output parameters + <CODE>pf0</CODE> - <CODE>pf3</CODE>. + See below for an explanation how to set those output parameters. + </TD> + </TR> +</TABLE> +</TR> + +<!----------- Notes ----------> +<TR> +<TH valign="top" align=left>NOTES</TH> +<TD>This function allows a milter to dynamically determine and +request operations and actions during startup. +In previous versions, the actions (f0) were fixed in the +<A HREF="smfi_register.html#flags">flags</A> field of the +<A HREF="smfi_register.html#smfiDesc">smfiDesc</A> +structure +and the protocol steps (f1) were implicitly derived by checking whether +a callback was defined. +Due to the extensions in the new milter version, +such a static selection will not work if a milter requires +new actions that are not available when talking to an older MTA. +Hence in the negotiation callback a milter can determine +which operations are available and dynamically select +those which it needs and which are offered. +If some operations are not available, the milter may either fall back +to an older mode or abort the session and ask the user to upgrade. + +<!-- +<P> +The protocol steps are defined in +<CODE>include/libmilter/mfdef.h</CODE>: +the macros start with +<CODE>SMFIP_</CODE>. +--> + +<P> +Protocol steps +(<CODE>f1</CODE>, <CODE>*pf1</CODE>): +<UL> +<LI><A NAME="SMFIP_RCPT_REJ"><CODE>SMFIP_RCPT_REJ</CODE></A>: +By setting this bit, a milter can request that the +MTA should also send <CODE>RCPT</CODE> commands that have been rejected +because the user is unknown (or similar reasons), but not those +which have been rejected because of syntax errors etc. +If a milter requests this protocol step, +then it should check the macro +<CODE>{rcpt_mailer}</CODE>: +if that is set to +<CODE>error</CODE>, +then the recipient will be rejected by the MTA. +Usually the macros +<CODE>{rcpt_host}</CODE> and <CODE>{rcpt_addr}</CODE> +will contain an enhanced status code and an error text +in that case, respectively. + +<LI><A NAME="SMFIP_SKIP"><CODE>SMFIP_SKIP</CODE></A> +indicates that the MTA understand the +<A HREF="api.html#SMFIS_SKIP">SMFIS_SKIP</A> +return code. + +<LI><A NAME="SMFIP_NR_"><CODE>SMFIP_NR_*</CODE></A> +indicates that the MTA understand the +<A HREF="api.html#SMFIS_NOREPLY">SMFIS_NOREPLY</A> +return code. +There are flags for various protocol stages: + +<UL> + +<LI><A NAME="SMFIP_NR_CONN"><CODE>SMFIP_NR_CONN</CODE></A>: +<A HREF="xxfi_connect.html">xxfi_connect()</A> + +<LI><A NAME="SMFIP_NR_HELO"><CODE>SMFIP_NR_HELO</CODE></A>: +<A HREF="xxfi_helo.html">xxfi_helo()</A> + +<LI><A NAME="SMFIP_NR_MAIL"><CODE>SMFIP_NR_MAIL</CODE></A>: +<A HREF="xxfi_envfrom.html">xxfi_envfrom()</A> + +<LI><A NAME="SMFIP_NR_RCPT"><CODE>SMFIP_NR_RCPT</CODE></A>: +<A HREF="xxfi_envrcpt.html">xxfi_envrcpt()</A> + +<LI><A NAME="SMFIP_NR_DATA"><CODE>SMFIP_NR_DATA</CODE></A>: +<A HREF="xxfi_data.html">xxfi_data()</A> + +<LI><A NAME="SMFIP_NR_UNKN"><CODE>SMFIP_NR_UNKN</CODE></A>: +<A HREF="xxfi_unknown.html">xxfi_unknown()</A> + +<LI><A NAME="SMFIP_NR_EOH"><CODE>SMFIP_NR_EOH</CODE></A>: +<A HREF="xxfi_eoh.html">xxfi_eoh()</A> + +<LI><A NAME="SMFIP_NR_BODY"><CODE>SMFIP_NR_BODY</CODE></A>: +<A HREF="xxfi_body.html">xxfi_body()</A> + +<LI><A NAME="SMFIP_NR_HDR"><CODE>SMFIP_NR_HDR</CODE></A>: +<A HREF="xxfi_header.html">xxfi_header()</A> + +</UL> + +<LI><A NAME="SMFIP_HDR_LEADSPC"><CODE>SMFIP_HDR_LEADSPC</CODE></A> +indicates that the MTA can send header values with leading space intact. +If this protocol step is requested, then the MTA will also not add a leading +space to headers when they are added, inserted, or changed. + +<!-- +:'a,.s;^#define \(SMFIP_NO[A-Z]*\)[ ].*;<LI><A NAME="\1"><CODE>\1</CODE></A>:; +--> +<LI>The MTA can be instructed not to send information about +various SMTP stages, these flags start with: +<A NAME="SMFIP_NO"><CODE>SMFIP_NO*</CODE></A>. +<UL> +<LI><A NAME="SMFIP_NOCONNECT"><CODE>SMFIP_NOCONNECT</CODE></A>: +<A HREF="xxfi_connect.html">xxfi_connect()</A> +<LI><A NAME="SMFIP_NOHELO"><CODE>SMFIP_NOHELO</CODE></A>: +<A HREF="xxfi_header.html">xxfi_header()</A> +<LI><A NAME="SMFIP_NOMAIL"><CODE>SMFIP_NOMAIL</CODE></A>: +<A HREF="xxfi_envfrom.html">xxfi_envfrom()</A> +<LI><A NAME="SMFIP_NORCPT"><CODE>SMFIP_NORCPT</CODE></A>: +<A HREF="xxfi_envrcpt.html">xxfi_envrcpt()</A> +<LI><A NAME="SMFIP_NOBODY"><CODE>SMFIP_NOBODY</CODE></A>: +<A HREF="xxfi_body.html">xxfi_body()</A> +<LI><A NAME="SMFIP_NOHDRS"><CODE>SMFIP_NOHDRS</CODE></A>: +<A HREF="xxfi_header.html">xxfi_header()</A> +<LI><A NAME="SMFIP_NOEOH"><CODE>SMFIP_NOEOH</CODE></A>: +<A HREF="xxfi_eoh.html">xxfi_eoh()</A> +<LI><A NAME="SMFIP_NOUNKNOWN"><CODE>SMFIP_NOUNKNOWN</CODE></A>: +<A HREF="xxfi_unknown.html">xxfi_unknown()</A> +<LI><A NAME="SMFIP_NODATA"><CODE>SMFIP_NODATA</CODE></A>: +<A HREF="xxfi_data.html">xxfi_data()</A> +</UL> + +For each of these xxfi_* callbacks that a milter does not use +the corresponding flag <EM>should</EM> be set in +<CODE>*pf1</CODE>. + +</UL> + +<P> +The available actions +(<CODE>f0</CODE>, <CODE>*pf0</CODE>) +are +<!-- +defined in +<CODE>include/libmilter/mfapi.h</CODE>: +the macros start with +<CODE>SMFIF_</CODE>; +these are +--> +described +<A HREF="smfi_register.html#flags">elsewhere (xxfi_flags)</A>. + +<P> +If a milter returns SMFIS_CONTINUE, then it <EM>must</EM> +set the desired actions and protocol steps +via the (output) parameters +<CODE>pf0</CODE> +and +<CODE>pf1</CODE> +(which correspond to +<CODE>f0</CODE> +and +<CODE>f1</CODE>, respectively). +The (output) parameters +<CODE>pf2</CODE> and +<CODE>pf3</CODE> +should be set to 0 for compatibility with future versions. + +</TD> +</TR> +</TABLE> + +<HR size="1"> +<FONT size="-1"> +Copyright (c) 2006 Sendmail, Inc. and its suppliers. +All rights reserved. +<BR> +By using this file, you agree to the terms and conditions set +forth in the LICENSE. +</FONT> +</BODY> +</HTML> |
