442 lines
12 KiB
C
442 lines
12 KiB
C
/*
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* Copyright (c) 1999-2002 Sendmail, Inc. and its suppliers.
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* All rights reserved.
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the sendmail distribution.
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*
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*
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* $Id: mfapi.h,v 1.1.1.4 2002/04/10 03:04:55 gshapiro Exp $
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*/
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/*
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** MFAPI.H -- Global definitions for mail filter library and mail filters.
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*/
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#ifndef _LIBMILTER_MFAPI_H
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# define _LIBMILTER_MFAPI_H 1
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# include <sys/types.h>
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# include <sys/socket.h>
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# include "libmilter/mfdef.h"
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# define LIBMILTER_API extern
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#ifndef _SOCK_ADDR
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# define _SOCK_ADDR struct sockaddr
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#endif /* ! _SOCK_ADDR */
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/*
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** libmilter functions return one of the following to indicate
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** success/failure:
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*/
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#define MI_SUCCESS 0
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#define MI_FAILURE (-1)
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/* "forward" declarations */
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typedef struct smfi_str SMFICTX;
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typedef struct smfi_str *SMFICTX_PTR;
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typedef struct smfiDesc smfiDesc_str;
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typedef struct smfiDesc *smfiDesc_ptr;
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/*
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** Type which callbacks should return to indicate message status.
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** This may take on one of the SMFIS_* values listed below.
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*/
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typedef int sfsistat;
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#if defined(__linux__) && defined(__GNUC__) && defined(__cplusplus) && __GNUC_MINOR__ >= 8
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# define SM__P(X) __PMT(X)
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#else /* __linux__ && __GNUC__ && __cplusplus && _GNUC_MINOR__ >= 8 */
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# define SM__P(X) __P(X)
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#endif /* __linux__ && __GNUC__ && __cplusplus && _GNUC_MINOR__ >= 8 */
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/* Some platforms don't define __P -- do it for them here: */
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#ifndef __P
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# ifdef __STDC__
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# define __P(X) X
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# else /* __STDC__ */
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# define __P(X) ()
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# endif /* __STDC__ */
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#endif /* __P */
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/*
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** structure describing one milter
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*/
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struct smfiDesc
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{
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char *xxfi_name; /* filter name */
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int xxfi_version; /* version code -- do not change */
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unsigned long xxfi_flags; /* flags */
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/* connection info filter */
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sfsistat (*xxfi_connect) SM__P((SMFICTX *, char *, _SOCK_ADDR *));
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/* SMTP HELO command filter */
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sfsistat (*xxfi_helo) SM__P((SMFICTX *, char *));
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/* envelope sender filter */
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sfsistat (*xxfi_envfrom) SM__P((SMFICTX *, char **));
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/* envelope recipient filter */
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sfsistat (*xxfi_envrcpt) SM__P((SMFICTX *, char **));
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/* header filter */
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sfsistat (*xxfi_header) SM__P((SMFICTX *, char *, char *));
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/* end of header */
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sfsistat (*xxfi_eoh) SM__P((SMFICTX *));
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/* body block */
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sfsistat (*xxfi_body) SM__P((SMFICTX *, unsigned char *, size_t));
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/* end of message */
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sfsistat (*xxfi_eom) SM__P((SMFICTX *));
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/* message aborted */
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sfsistat (*xxfi_abort) SM__P((SMFICTX *));
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/* connection cleanup */
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sfsistat (*xxfi_close) SM__P((SMFICTX *));
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};
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LIBMILTER_API int smfi_register __P((struct smfiDesc));
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LIBMILTER_API int smfi_main __P((void));
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LIBMILTER_API int smfi_setbacklog __P((int));
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LIBMILTER_API int smfi_setdbg __P((int));
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LIBMILTER_API int smfi_settimeout __P((int));
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LIBMILTER_API int smfi_setconn __P((char *));
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LIBMILTER_API int smfi_stop __P((void));
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#define SMFI_VERSION 2 /* version number */
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/*
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** What the filter might do -- values to be ORed together for
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** smfiDesc.xxfi_flags.
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*/
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#define SMFIF_NONE 0x00000000L /* no flags */
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#define SMFIF_ADDHDRS 0x00000001L /* filter may add headers */
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#define SMFIF_CHGBODY 0x00000002L /* filter may replace body */
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#define SMFIF_MODBODY SMFIF_CHGBODY /* backwards compatible */
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#define SMFIF_ADDRCPT 0x00000004L /* filter may add recipients */
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#define SMFIF_DELRCPT 0x00000008L /* filter may delete recipients */
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#define SMFIF_CHGHDRS 0x00000010L /* filter may change/delete headers */
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#if _FFR_QUARANTINE
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# define SMFIF_QUARANTINE 0x00000020L /* filter may quarantine envelope */
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#endif /* _FFR_QUARANTINE */
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/*
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** Continue processing message/connection.
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*/
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#define SMFIS_CONTINUE 0
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/*
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** Reject the message/connection.
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** No further routines will be called for this message
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** (or connection, if returned from a connection-oriented routine).
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*/
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#define SMFIS_REJECT 1
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/*
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** Accept the message,
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** but silently discard the message.
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** No further routines will be called for this message.
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** This is only meaningful from message-oriented routines.
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*/
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#define SMFIS_DISCARD 2
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/*
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** Accept the message/connection.
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** No further routines will be called for this message
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** (or connection, if returned from a connection-oriented routine;
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** in this case, it causes all messages on this connection
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** to be accepted without filtering).
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*/
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#define SMFIS_ACCEPT 3
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/*
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** Return a temporary failure, i.e.,
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** the corresponding SMTP command will return a 4xx status code.
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** In some cases this may prevent further routines from
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** being called on this message or connection,
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** although in other cases (e.g., when processing an envelope
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** recipient) processing of the message will continue.
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*/
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#define SMFIS_TEMPFAIL 4
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#if 0
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/*
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** Filter Routine Details
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*/
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/* connection info filter */
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extern sfsistat xxfi_connect __P((SMFICTX *, char *, _SOCK_ADDR *));
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/*
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** xxfi_connect(ctx, hostname, hostaddr) Invoked on each connection
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**
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** char *hostname; Host domain name, as determined by a reverse lookup
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** on the host address.
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** _SOCK_ADDR *hostaddr; Host address, as determined by a getpeername
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** call on the SMTP socket.
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*/
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/* SMTP HELO command filter */
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extern sfsistat xxfi_helo __P((SMFICTX *, char *));
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/*
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** xxfi_helo(ctx, helohost) Invoked on SMTP HELO/EHLO command
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**
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** char *helohost; Value passed to HELO/EHLO command, which should be
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** the domain name of the sending host (but is, in practice,
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** anything the sending host wants to send).
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*/
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/* envelope sender filter */
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extern sfsistat xxfi_envfrom __P((SMFICTX *, char **));
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/*
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** xxfi_envfrom(ctx, argv) Invoked on envelope from
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**
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** char **argv; Null-terminated SMTP command arguments;
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** argv[0] is guaranteed to be the sender address.
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** Later arguments are the ESMTP arguments.
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*/
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/* envelope recipient filter */
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extern sfsistat xxfi_envrcpt __P((SMFICTX *, char **));
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/*
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** xxfi_envrcpt(ctx, argv) Invoked on each envelope recipient
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**
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** char **argv; Null-terminated SMTP command arguments;
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** argv[0] is guaranteed to be the recipient address.
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** Later arguments are the ESMTP arguments.
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*/
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/* header filter */
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extern sfsistat xxfi_header __P((SMFICTX *, char *, char *));
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/*
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** xxfi_header(ctx, headerf, headerv) Invoked on each message header. The
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** content of the header may have folded white space (that is, multiple
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** lines with following white space) included.
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**
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** char *headerf; Header field name
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** char *headerv; Header field value
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*/
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/* end of header */
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extern sfsistat xxfi_eoh __P((SMFICTX *));
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/*
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** xxfi_eoh(ctx) Invoked at end of header
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*/
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/* body block */
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extern sfsistat xxfi_body __P((SMFICTX *, unsigned char *, size_t));
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/*
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** xxfi_body(ctx, bodyp, bodylen) Invoked for each body chunk. There may
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** be multiple body chunks passed to the filter. End-of-lines are
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** represented as received from SMTP (normally Carriage-Return/Line-Feed).
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**
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** unsigned char *bodyp; Pointer to body data
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** size_t bodylen; Length of body data
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*/
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/* end of message */
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extern sfsistat xxfi_eom __P((SMFICTX *));
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/*
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** xxfi_eom(ctx) Invoked at end of message. This routine can perform
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** special operations such as modifying the message header, body, or
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** envelope.
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*/
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/* message aborted */
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extern sfsistat xxfi_abort __P((SMFICTX *));
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/*
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** xxfi_abort(ctx) Invoked if message is aborted outside of the control of
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** the filter, for example, if the SMTP sender issues an RSET command. If
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** xxfi_abort is called, xxfi_eom will not be called and vice versa.
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*/
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/* connection cleanup */
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extern sfsistat xxfi_close __P((SMFICTX *));
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/*
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** xxfi_close(ctx) Invoked at end of the connection. This is called on
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** close even if the previous mail transaction was aborted.
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*/
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#endif /* 0 */
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/*
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** Additional information is passed in to the vendor filter routines using
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** symbols. Symbols correspond closely to sendmail macros. The symbols
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** defined depend on the context. The value of a symbol is accessed using:
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*/
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/* Return the value of a symbol. */
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LIBMILTER_API char * smfi_getsymval __P((SMFICTX *, char *));
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/*
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** Return the value of a symbol.
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**
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** SMFICTX *ctx; Opaque context structure
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** char *symname; The name of the symbol to access.
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*/
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/*
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** Vendor filter routines that want to pass additional information back to
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** the MTA for use in SMTP replies may call smfi_setreply before returning.
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*/
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LIBMILTER_API int smfi_setreply __P((SMFICTX *, char *, char *, char *));
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#if _FFR_MULTILINE
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/*
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** Alternatively, smfi_setmlreply can be called if a multi-line SMTP reply
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** is needed.
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*/
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LIBMILTER_API int smfi_setmlreply __P((SMFICTX *, const char *, const char *, ...));
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#endif /* _FFR_MULTILINE */
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/*
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** Set the specific reply code to be used in response to the active
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** command. If not specified, a generic reply code is used.
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**
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** SMFICTX *ctx; Opaque context structure
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** char *rcode; The three-digit (RFC 821) SMTP reply code to be
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** returned, e.g., ``551''.
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** char *xcode; The extended (RFC 2034) reply code, e.g., ``5.7.6''.
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** char *message; The text part of the SMTP reply.
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*/
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/*
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** The xxfi_eom routine is called at the end of a message (essentially,
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** after the final DATA dot). This routine can call some special routines
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** to modify the envelope, header, or body of the message before the
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** message is enqueued. These routines must not be called from any vendor
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** routine other than xxfi_eom.
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*/
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LIBMILTER_API int smfi_addheader __P((SMFICTX *, char *, char *));
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/*
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** Add a header to the message. This header is not passed to other
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** filters. It is not checked for standards compliance; the mail filter
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** must ensure that no protocols are violated as a result of adding this
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** header.
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**
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** SMFICTX *ctx; Opaque context structure
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** char *headerf; Header field name
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** char *headerv; Header field value
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*/
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LIBMILTER_API int smfi_chgheader __P((SMFICTX *, char *, int, char *));
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/*
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** Change/delete a header in the message. It is not checked for standards
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** compliance; the mail filter must ensure that no protocols are violated
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** as a result of adding this header.
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**
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** SMFICTX *ctx; Opaque context structure
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** char *headerf; Header field name
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** int index; The Nth occurence of header field name
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** char *headerv; New header field value (empty for delete header)
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*/
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LIBMILTER_API int smfi_addrcpt __P((SMFICTX *, char *));
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/*
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** Add a recipient to the envelope
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**
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** SMFICTX *ctx; Opaque context structure
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** char *rcpt; Recipient to be added
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*/
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LIBMILTER_API int smfi_delrcpt __P((SMFICTX *, char *));
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#if _FFR_SMFI_PROGRESS
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/*
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** Send a "no-op" up to the MTA to tell it we're still alive, so long
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** milter-side operations don't time out.
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**
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** SMFICTX *ctx; Opaque context structure
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*/
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LIBMILTER_API int smfi_progress __P((SMFICTX *));
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#endif /* _FFR_SMFI_PROGRESS */
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/*
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** Delete a recipient from the envelope
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**
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** SMFICTX *ctx; Opaque context structure
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** char *rcpt; Envelope recipient to be deleted. This should be in
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** exactly the form passed to xxfi_envrcpt or the address may
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** not be deleted.
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*/
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LIBMILTER_API int smfi_replacebody __P((SMFICTX *, unsigned char *, int));
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/*
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** Replace the body of the message. This routine may be called multiple
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** times if the body is longer than convenient to send in one call. End of
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** line should be represented as Carriage-Return/Line Feed.
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**
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** char *bodyp; Pointer to block of body information to insert
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** int bodylen; Length of data pointed at by bodyp
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*/
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/*
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** If the message is aborted (for example, if the SMTP sender sends the
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** envelope but then does a QUIT or RSET before the data is sent),
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** xxfi_abort is called. This can be used to reset state.
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*/
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#if _FFR_QUARANTINE
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/*
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** Quarantine an envelope
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**
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** SMFICTX *ctx; Opaque context structure
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** char *reason: explanation
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*/
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LIBMILTER_API int smfi_quarantine __P((SMFICTX *ctx, char *reason));
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#endif /* _FFR_QUARANTINE */
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/*
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** Connection-private data (specific to an SMTP connection) can be
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** allocated using the smfi_setpriv routine; routines can access private
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** data using smfi_getpriv.
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*/
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LIBMILTER_API int smfi_setpriv __P((SMFICTX *, void *));
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/*
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** Set the private data pointer
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**
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** SMFICTX *ctx; Opaque context structure
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** void *privatedata; Pointer to private data area
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*/
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LIBMILTER_API void *smfi_getpriv __P((SMFICTX *));
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#endif /* !_LIBMILTER_MFAPI_H */
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