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| Current File : //usr/include/libmilter/mfapi.h |
/*
* Copyright (c) 1999-2004, 2006, 2008 Sendmail, Inc. and its suppliers.
* All rights reserved.
*
* By using this file, you agree to the terms and conditions set
* forth in the LICENSE file which can be found at the top level of
* the sendmail distribution.
*
*
* $Id: mfapi.h,v 8.80 2009/11/06 00:57:08 ca Exp $
*/
/*
** MFAPI.H -- Global definitions for mail filter library and mail filters.
*/
#ifndef _LIBMILTER_MFAPI_H
# define _LIBMILTER_MFAPI_H 1
#ifndef SMFI_VERSION
# if _FFR_MDS_NEGOTIATE
# define SMFI_VERSION 0x01000002 /* libmilter version number */
/* first libmilter version that has MDS support */
# define SMFI_VERSION_MDS 0x01000002
# else /* _FFR_MDS_NEGOTIATE */
# define SMFI_VERSION 0x01000001 /* libmilter version number */
# endif /* _FFR_MDS_NEGOTIATE */
#endif /* ! SMFI_VERSION */
#define SM_LM_VRS_MAJOR(v) (((v) & 0x7f000000) >> 24)
#define SM_LM_VRS_MINOR(v) (((v) & 0x007fff00) >> 8)
#define SM_LM_VRS_PLVL(v) ((v) & 0x0000007f)
# include <sys/types.h>
# include <sys/socket.h>
#include "libmilter/mfdef.h"
# define LIBMILTER_API extern
/* Only need to export C interface if used by C++ source code */
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#ifndef _SOCK_ADDR
# define _SOCK_ADDR struct sockaddr
#endif /* ! _SOCK_ADDR */
/*
** libmilter functions return one of the following to indicate
** success/failure(/continue):
*/
#define MI_SUCCESS 0
#define MI_FAILURE (-1)
#if _FFR_WORKERS_POOL
# define MI_CONTINUE 1
#endif /* _FFR_WORKERS_POOL */
/* "forward" declarations */
typedef struct smfi_str SMFICTX;
typedef struct smfi_str *SMFICTX_PTR;
typedef struct smfiDesc smfiDesc_str;
typedef struct smfiDesc *smfiDesc_ptr;
/*
** Type which callbacks should return to indicate message status.
** This may take on one of the SMFIS_* values listed below.
*/
typedef int sfsistat;
#if defined(__linux__) && defined(__GNUC__) && defined(__cplusplus) && __GNUC_MINOR__ >= 8
# define SM__P(X) __PMT(X)
#else /* __linux__ && __GNUC__ && __cplusplus && _GNUC_MINOR__ >= 8 */
# define SM__P(X) __P(X)
#endif /* __linux__ && __GNUC__ && __cplusplus && _GNUC_MINOR__ >= 8 */
/* Some platforms don't define __P -- do it for them here: */
#ifndef __P
# ifdef __STDC__
# define __P(X) X
# else /* __STDC__ */
# define __P(X) ()
# endif /* __STDC__ */
#endif /* __P */
#if SM_CONF_STDBOOL_H
# include <stdbool.h>
#else /* SM_CONF_STDBOOL_H */
# ifndef __cplusplus
# ifndef bool
# ifndef __bool_true_false_are_defined
typedef int bool;
# define __bool_true_false_are_defined 1
# endif /* ! __bool_true_false_are_defined */
# endif /* bool */
# endif /* ! __cplusplus */
#endif /* SM_CONF_STDBOOL_H */
/*
** structure describing one milter
*/
struct smfiDesc
{
char *xxfi_name; /* filter name */
int xxfi_version; /* version code -- do not change */
unsigned long xxfi_flags; /* flags */
/* connection info filter */
sfsistat (*xxfi_connect) SM__P((SMFICTX *, char *, _SOCK_ADDR *));
/* SMTP HELO command filter */
sfsistat (*xxfi_helo) SM__P((SMFICTX *, char *));
/* envelope sender filter */
sfsistat (*xxfi_envfrom) SM__P((SMFICTX *, char **));
/* envelope recipient filter */
sfsistat (*xxfi_envrcpt) SM__P((SMFICTX *, char **));
/* header filter */
sfsistat (*xxfi_header) SM__P((SMFICTX *, char *, char *));
/* end of header */
sfsistat (*xxfi_eoh) SM__P((SMFICTX *));
/* body block */
sfsistat (*xxfi_body) SM__P((SMFICTX *, unsigned char *, size_t));
/* end of message */
sfsistat (*xxfi_eom) SM__P((SMFICTX *));
/* message aborted */
sfsistat (*xxfi_abort) SM__P((SMFICTX *));
/* connection cleanup */
sfsistat (*xxfi_close) SM__P((SMFICTX *));
/* any unrecognized or unimplemented command filter */
sfsistat (*xxfi_unknown) SM__P((SMFICTX *, const char *));
/* SMTP DATA command filter */
sfsistat (*xxfi_data) SM__P((SMFICTX *));
/* negotiation callback */
sfsistat (*xxfi_negotiate) SM__P((SMFICTX *,
unsigned long, unsigned long,
unsigned long, unsigned long,
unsigned long *, unsigned long *,
unsigned long *, unsigned long *));
#if 0
/* signal handler callback, not yet implemented. */
int (*xxfi_signal) SM__P((int));
#endif
};
LIBMILTER_API int smfi_opensocket __P((bool));
LIBMILTER_API int smfi_register __P((struct smfiDesc));
LIBMILTER_API int smfi_main __P((void));
LIBMILTER_API int smfi_setbacklog __P((int));
LIBMILTER_API int smfi_setdbg __P((int));
LIBMILTER_API int smfi_settimeout __P((int));
LIBMILTER_API int smfi_setconn __P((char *));
LIBMILTER_API int smfi_stop __P((void));
LIBMILTER_API size_t smfi_setmaxdatasize __P((size_t));
LIBMILTER_API int smfi_version __P((unsigned int *, unsigned int *, unsigned int *));
/*
** What the filter might do -- values to be ORed together for
** smfiDesc.xxfi_flags.
*/
#define SMFIF_NONE 0x00000000L /* no flags */
#define SMFIF_ADDHDRS 0x00000001L /* filter may add headers */
#define SMFIF_CHGBODY 0x00000002L /* filter may replace body */
#define SMFIF_MODBODY SMFIF_CHGBODY /* backwards compatible */
#define SMFIF_ADDRCPT 0x00000004L /* filter may add recipients */
#define SMFIF_DELRCPT 0x00000008L /* filter may delete recipients */
#define SMFIF_CHGHDRS 0x00000010L /* filter may change/delete headers */
#define SMFIF_QUARANTINE 0x00000020L /* filter may quarantine envelope */
/* filter may change "from" (envelope sender) */
#define SMFIF_CHGFROM 0x00000040L
#define SMFIF_ADDRCPT_PAR 0x00000080L /* add recipients incl. args */
/* filter can send set of symbols (macros) that it wants */
#define SMFIF_SETSYMLIST 0x00000100L
/*
** Macro "places";
** Notes:
** - must be coordinated with libmilter/engine.c and sendmail/milter.c
** - the order MUST NOT be changed as it would break compatibility between
** different versions. It's ok to append new entries however
** (hence the list is not sorted by the SMT protocol steps).
*/
#define SMFIM_FIRST 0 /* Do NOT use, internal marker only */
#define SMFIM_CONNECT 0 /* connect */
#define SMFIM_HELO 1 /* HELO/EHLO */
#define SMFIM_ENVFROM 2 /* MAIL From */
#define SMFIM_ENVRCPT 3 /* RCPT To */
#define SMFIM_DATA 4 /* DATA */
#define SMFIM_EOM 5 /* end of message (final dot) */
#define SMFIM_EOH 6 /* end of header */
#define SMFIM_LAST 6 /* Do NOT use, internal marker only */
/*
** Continue processing message/connection.
*/
#define SMFIS_CONTINUE 0
/*
** Reject the message/connection.
** No further routines will be called for this message
** (or connection, if returned from a connection-oriented routine).
*/
#define SMFIS_REJECT 1
/*
** Accept the message,
** but silently discard the message.
** No further routines will be called for this message.
** This is only meaningful from message-oriented routines.
*/
#define SMFIS_DISCARD 2
/*
** Accept the message/connection.
** No further routines will be called for this message
** (or connection, if returned from a connection-oriented routine;
** in this case, it causes all messages on this connection
** to be accepted without filtering).
*/
#define SMFIS_ACCEPT 3
/*
** Return a temporary failure, i.e.,
** the corresponding SMTP command will return a 4xx status code.
** In some cases this may prevent further routines from
** being called on this message or connection,
** although in other cases (e.g., when processing an envelope
** recipient) processing of the message will continue.
*/
#define SMFIS_TEMPFAIL 4
/*
** Do not send a reply to the MTA
*/
#define SMFIS_NOREPLY 7
/*
** Skip over rest of same callbacks, e.g., body.
*/
#define SMFIS_SKIP 8
/* xxfi_negotiate: use all existing protocol options/actions */
#define SMFIS_ALL_OPTS 10
#if 0
/*
** Filter Routine Details
*/
/* connection info filter */
extern sfsistat xxfi_connect __P((SMFICTX *, char *, _SOCK_ADDR *));
/*
** xxfi_connect(ctx, hostname, hostaddr) Invoked on each connection
**
** char *hostname; Host domain name, as determined by a reverse lookup
** on the host address.
** _SOCK_ADDR *hostaddr; Host address, as determined by a getpeername
** call on the SMTP socket.
*/
/* SMTP HELO command filter */
extern sfsistat xxfi_helo __P((SMFICTX *, char *));
/*
** xxfi_helo(ctx, helohost) Invoked on SMTP HELO/EHLO command
**
** char *helohost; Value passed to HELO/EHLO command, which should be
** the domain name of the sending host (but is, in practice,
** anything the sending host wants to send).
*/
/* envelope sender filter */
extern sfsistat xxfi_envfrom __P((SMFICTX *, char **));
/*
** xxfi_envfrom(ctx, argv) Invoked on envelope from
**
** char **argv; Null-terminated SMTP command arguments;
** argv[0] is guaranteed to be the sender address.
** Later arguments are the ESMTP arguments.
*/
/* envelope recipient filter */
extern sfsistat xxfi_envrcpt __P((SMFICTX *, char **));
/*
** xxfi_envrcpt(ctx, argv) Invoked on each envelope recipient
**
** char **argv; Null-terminated SMTP command arguments;
** argv[0] is guaranteed to be the recipient address.
** Later arguments are the ESMTP arguments.
*/
/* unknown command filter */
extern sfsistat *xxfi_unknown __P((SMFICTX *, const char *));
/*
** xxfi_unknown(ctx, arg) Invoked when SMTP command is not recognized or not
** implemented.
** const char *arg; Null-terminated SMTP command
*/
/* header filter */
extern sfsistat xxfi_header __P((SMFICTX *, char *, char *));
/*
** xxfi_header(ctx, headerf, headerv) Invoked on each message header. The
** content of the header may have folded white space (that is, multiple
** lines with following white space) included.
**
** char *headerf; Header field name
** char *headerv; Header field value
*/
/* end of header */
extern sfsistat xxfi_eoh __P((SMFICTX *));
/*
** xxfi_eoh(ctx) Invoked at end of header
*/
/* body block */
extern sfsistat xxfi_body __P((SMFICTX *, unsigned char *, size_t));
/*
** xxfi_body(ctx, bodyp, bodylen) Invoked for each body chunk. There may
** be multiple body chunks passed to the filter. End-of-lines are
** represented as received from SMTP (normally Carriage-Return/Line-Feed).
**
** unsigned char *bodyp; Pointer to body data
** size_t bodylen; Length of body data
*/
/* end of message */
extern sfsistat xxfi_eom __P((SMFICTX *));
/*
** xxfi_eom(ctx) Invoked at end of message. This routine can perform
** special operations such as modifying the message header, body, or
** envelope.
*/
/* message aborted */
extern sfsistat xxfi_abort __P((SMFICTX *));
/*
** xxfi_abort(ctx) Invoked if message is aborted outside of the control of
** the filter, for example, if the SMTP sender issues an RSET command. If
** xxfi_abort is called, xxfi_eom will not be called and vice versa.
*/
/* connection cleanup */
extern sfsistat xxfi_close __P((SMFICTX *));
/*
** xxfi_close(ctx) Invoked at end of the connection. This is called on
** close even if the previous mail transaction was aborted.
*/
#endif /* 0 */
/*
** Additional information is passed in to the vendor filter routines using
** symbols. Symbols correspond closely to sendmail macros. The symbols
** defined depend on the context. The value of a symbol is accessed using:
*/
/* Return the value of a symbol. */
LIBMILTER_API char * smfi_getsymval __P((SMFICTX *, char *));
/*
** Return the value of a symbol.
**
** SMFICTX *ctx; Opaque context structure
** char *symname; The name of the symbol to access.
*/
/*
** Vendor filter routines that want to pass additional information back to
** the MTA for use in SMTP replies may call smfi_setreply before returning.
*/
LIBMILTER_API int smfi_setreply __P((SMFICTX *, char *, char *, char *));
/*
** Alternatively, smfi_setmlreply can be called if a multi-line SMTP reply
** is needed.
*/
LIBMILTER_API int smfi_setmlreply __P((SMFICTX *, const char *, const char *, ...));
/*
** Set the specific reply code to be used in response to the active
** command. If not specified, a generic reply code is used.
**
** SMFICTX *ctx; Opaque context structure
** char *rcode; The three-digit (RFC 821) SMTP reply code to be
** returned, e.g., ``551''.
** char *xcode; The extended (RFC 2034) reply code, e.g., ``5.7.6''.
** char *message; The text part of the SMTP reply.
*/
/*
** The xxfi_eom routine is called at the end of a message (essentially,
** after the final DATA dot). This routine can call some special routines
** to modify the envelope, header, or body of the message before the
** message is enqueued. These routines must not be called from any vendor
** routine other than xxfi_eom.
*/
LIBMILTER_API int smfi_addheader __P((SMFICTX *, char *, char *));
/*
** Add a header to the message. It is not checked for standards
** compliance; the mail filter must ensure that no protocols are violated
** as a result of adding this header.
**
** SMFICTX *ctx; Opaque context structure
** char *headerf; Header field name
** char *headerv; Header field value
*/
LIBMILTER_API int smfi_chgheader __P((SMFICTX *, char *, int, char *));
/*
** Change/delete a header in the message. It is not checked for standards
** compliance; the mail filter must ensure that no protocols are violated
** as a result of adding this header.
**
** SMFICTX *ctx; Opaque context structure
** char *headerf; Header field name
** int index; The Nth occurence of header field name
** char *headerv; New header field value (empty for delete header)
*/
LIBMILTER_API int smfi_insheader __P((SMFICTX *, int, char *, char *));
/*
** Insert a header into the message. It is not checked for standards
** compliance; the mail filter must ensure that no protocols are violated
** as a result of adding this header.
**
** SMFICTX *ctx; Opaque context structure
** int idx; index into the header list where the insertion should happen
** char *headerh; Header field name
** char *headerv; Header field value
*/
LIBMILTER_API int smfi_chgfrom __P((SMFICTX *, char *, char *));
/*
** Modify envelope sender address
**
** SMFICTX *ctx; Opaque context structure
** char *mail; New envelope sender address
** char *args; ESMTP arguments
*/
LIBMILTER_API int smfi_addrcpt __P((SMFICTX *, char *));
/*
** Add a recipient to the envelope
**
** SMFICTX *ctx; Opaque context structure
** char *rcpt; Recipient to be added
*/
LIBMILTER_API int smfi_addrcpt_par __P((SMFICTX *, char *, char *));
/*
** Add a recipient to the envelope
**
** SMFICTX *ctx; Opaque context structure
** char *rcpt; Recipient to be added
** char *args; ESMTP arguments
*/
LIBMILTER_API int smfi_delrcpt __P((SMFICTX *, char *));
/*
** Send a "no-op" up to the MTA to tell it we're still alive, so long
** milter-side operations don't time out.
**
** SMFICTX *ctx; Opaque context structure
*/
LIBMILTER_API int smfi_progress __P((SMFICTX *));
/*
** Delete a recipient from the envelope
**
** SMFICTX *ctx; Opaque context structure
** char *rcpt; Envelope recipient to be deleted. This should be in
** exactly the form passed to xxfi_envrcpt or the address may
** not be deleted.
*/
LIBMILTER_API int smfi_replacebody __P((SMFICTX *, unsigned char *, int));
/*
** Replace the body of the message. This routine may be called multiple
** times if the body is longer than convenient to send in one call. End of
** line should be represented as Carriage-Return/Line Feed.
**
** char *bodyp; Pointer to block of body information to insert
** int bodylen; Length of data pointed at by bodyp
*/
/*
** If the message is aborted (for example, if the SMTP sender sends the
** envelope but then does a QUIT or RSET before the data is sent),
** xxfi_abort is called. This can be used to reset state.
*/
/*
** Quarantine an envelope
**
** SMFICTX *ctx; Opaque context structure
** char *reason: explanation
*/
LIBMILTER_API int smfi_quarantine __P((SMFICTX *ctx, char *reason));
/*
** Connection-private data (specific to an SMTP connection) can be
** allocated using the smfi_setpriv routine; routines can access private
** data using smfi_getpriv.
*/
LIBMILTER_API int smfi_setpriv __P((SMFICTX *, void *));
/*
** Set the private data pointer
**
** SMFICTX *ctx; Opaque context structure
** void *privatedata; Pointer to private data area
*/
LIBMILTER_API void *smfi_getpriv __P((SMFICTX *));
/*
** Get the private data pointer
**
** SMFICTX *ctx; Opaque context structure
** void *privatedata; Pointer to private data area
*/
LIBMILTER_API int smfi_setsymlist __P((SMFICTX *, int, char *));
/*
** Set list of symbols (macros) to receive
**
** SMFICTX *ctx; Opaque context structure
** int where; where in the SMTP dialogue should the macros be sent
** char *macros; list of macros (space separated)
*/
#if _FFR_THREAD_MONITOR
LIBMILTER_API int smfi_set_max_exec_time __P((unsigned int));
#endif /* _FFR_THREAD_MONITOR */
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* ! _LIBMILTER_MFAPI_H */