Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2911 insertions, 0 deletions

diff --git a/src/milter/milter8.c b/src/milter/milter8.c
new file mode 100644
index 0000000..6344734
--- /dev/null
+++ b/src/milter/milter8.c
@@ -0,0 +1,2911 @@
+/*++
+/* NAME
+/*	milter8 3
+/* SUMMARY
+/*	MTA-side Sendmail 8 Milter protocol
+/* SYNOPSIS
+/*	#include <milter8.h>
+/*
+/*	MILTER	*milter8_create(name, conn_timeout, cmd_timeout, msg_timeout,
+/*				protocol, def_action, parent)
+/*	const char *name;
+/*	int conn_timeout;
+/*	int cmd_timeout;
+/*	int msg_timeout;
+/*	const char *protocol;
+/*	const char *def_action;
+/*	MILTERS *parent;
+/*
+/*	MILTER	*milter8_receive(stream)
+/*	VSTREAM	*stream;
+/* DESCRIPTION
+/*	This module implements the MTA side of the Sendmail 8 mail
+/*	filter protocol.
+/*
+/*	milter8_create() creates a MILTER data structure with virtual
+/*	functions that implement a client for the Sendmail 8 Milter
+/*	protocol. These virtual functions are then invoked via the
+/*	milter(3) interface.  The *timeout, protocol and def_action
+/*	arguments come directly from milter_create(). The parent
+/*	argument specifies a context for content editing.
+/*
+/*	milter8_receive() receives a mail filter definition from the
+/*	specified stream. The result is zero in case of success.
+/*
+/*	Arguments:
+/* .IP name
+/*	The Milter application endpoint, either inet:host:port or
+/*	unix:/pathname.
+/* DIAGNOSTICS
+/*	Panic: interface violation.  Fatal errors: out of memory.
+/* CONFIGURATION PARAMETERS
+/*	milter8_protocol, protocol version and extensions
+/* SEE ALSO
+/*	milter(3) generic Milter interface
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*
+/*	Wietse Venema
+/*	Google, Inc.
+/*	111 8th Avenue
+/*	New York, NY 10011, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <stddef.h>			/* offsetof() */
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <limits.h>			/* INT_MAX */
+
+#ifndef SHUT_RDWR
+#define SHUT_RDWR	2
+#endif
+
+#ifdef STRCASECMP_IN_STRINGS_H
+#include <strings.h>
+#endif
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mymalloc.h>
+#include <split_at.h>
+#include <connect.h>
+#include <argv.h>
+#include <name_mask.h>
+#include <name_code.h>
+#include <stringops.h>
+#include <compat_va_copy.h>
+
+/* Global library. */
+
+#include <mail_params.h>
+#include <mail_proto.h>
+#include <rec_type.h>
+#include <record.h>
+#include <mime_state.h>
+#include <is_header.h>
+
+/* Postfix Milter library. */
+
+#include <milter.h>
+
+/* Application-specific. */
+
+ /*
+  * Use our own protocol definitions, so that Postfix can be built even when
+  * libmilter is not installed. This means that we must specify the libmilter
+  * protocol version in main.cf, and that we must send only the commands that
+  * are supported for that protocol version.
+  */
+
+ /*
+  * Commands from MTA to filter.
+  */
+#define SMFIC_ABORT		'A'	/* Abort */
+#define SMFIC_BODY		'B'	/* Body chunk */
+#define SMFIC_CONNECT		'C'	/* Connection information */
+#define SMFIC_MACRO		'D'	/* Define macro */
+#define SMFIC_BODYEOB		'E'	/* final body chunk (End) */
+#define SMFIC_HELO		'H'	/* HELO/EHLO */
+#define SMFIC_HEADER		'L'	/* Header */
+#define SMFIC_MAIL		'M'	/* MAIL from */
+#define SMFIC_EOH		'N'	/* EOH */
+#define SMFIC_OPTNEG		'O'	/* Option negotiation */
+#define SMFIC_QUIT		'Q'	/* QUIT */
+#define SMFIC_RCPT		'R'	/* RCPT to */
+#define SMFIC_DATA		'T'	/* DATA */
+#define SMFIC_UNKNOWN		'U'	/* Any unknown command */
+ /* Introduced with Sendmail 8.14. */
+#define SMFIC_QUIT_NC		'K'	/* Quit + new connection */
+
+static const NAME_CODE smfic_table[] = {
+    "SMFIC_ABORT", SMFIC_ABORT,
+    "SMFIC_BODY", SMFIC_BODY,
+    "SMFIC_CONNECT", SMFIC_CONNECT,
+    "SMFIC_MACRO", SMFIC_MACRO,
+    "SMFIC_BODYEOB", SMFIC_BODYEOB,
+    "SMFIC_HELO", SMFIC_HELO,
+    "SMFIC_HEADER", SMFIC_HEADER,
+    "SMFIC_MAIL", SMFIC_MAIL,
+    "SMFIC_EOH", SMFIC_EOH,
+    "SMFIC_OPTNEG", SMFIC_OPTNEG,
+    "SMFIC_QUIT", SMFIC_QUIT,
+    "SMFIC_RCPT", SMFIC_RCPT,
+    "SMFIC_DATA", SMFIC_DATA,
+    "SMFIC_UNKNOWN", SMFIC_UNKNOWN,
+    /* Introduced with Sendmail 8.14. */
+    "SMFIC_QUIT_NC", SMFIC_QUIT_NC,
+    0, 0,
+};
+
+ /*
+  * Responses from filter to MTA.
+  */
+#define SMFIR_ADDRCPT		'+'	/* add recipient */
+#define SMFIR_DELRCPT		'-'	/* remove recipient */
+#define SMFIR_ACCEPT		'a'	/* accept */
+#define SMFIR_REPLBODY		'b'	/* replace body (chunk) */
+#define SMFIR_CONTINUE		'c'	/* continue */
+#define SMFIR_DISCARD		'd'	/* discard */
+#define SMFIR_CONN_FAIL		'f'	/* cause a connection failure */
+#define SMFIR_CHGHEADER		'm'	/* change header */
+#define SMFIR_PROGRESS		'p'	/* progress */
+#define SMFIR_REJECT		'r'	/* reject */
+#define SMFIR_TEMPFAIL		't'	/* tempfail */
+#define SMFIR_SHUTDOWN		'4'	/* 421: shutdown (internal to MTA) */
+#define SMFIR_ADDHEADER		'h'	/* add header */
+#define SMFIR_INSHEADER		'i'	/* insert header */
+#define SMFIR_REPLYCODE		'y'	/* reply code etc */
+#define SMFIR_QUARANTINE	'q'	/* quarantine */
+ /* Introduced with Sendmail 8.14. */
+#define SMFIR_SKIP		's'	/* skip further events of this type */
+#define SMFIR_CHGFROM		'e'	/* change sender (incl. ESMTP args) */
+#define SMFIR_ADDRCPT_PAR	'2'	/* add recipient (incl. ESMTP args) */
+#define SMFIR_SETSYMLIST	'l'	/* set list of symbols (macros) */
+
+static const NAME_CODE smfir_table[] = {
+    "SMFIR_ADDRCPT", SMFIR_ADDRCPT,
+    "SMFIR_DELRCPT", SMFIR_DELRCPT,
+    "SMFIR_ACCEPT", SMFIR_ACCEPT,
+    "SMFIR_REPLBODY", SMFIR_REPLBODY,
+    "SMFIR_CONTINUE", SMFIR_CONTINUE,
+    "SMFIR_DISCARD", SMFIR_DISCARD,
+    "SMFIR_CONN_FAIL", SMFIR_CONN_FAIL,
+    "SMFIR_CHGHEADER", SMFIR_CHGHEADER,
+    "SMFIR_PROGRESS", SMFIR_PROGRESS,
+    "SMFIR_REJECT", SMFIR_REJECT,
+    "SMFIR_TEMPFAIL", SMFIR_TEMPFAIL,
+    "SMFIR_SHUTDOWN", SMFIR_SHUTDOWN,
+    "SMFIR_ADDHEADER", SMFIR_ADDHEADER,
+    "SMFIR_INSHEADER", SMFIR_INSHEADER,
+    "SMFIR_REPLYCODE", SMFIR_REPLYCODE,
+    "SMFIR_QUARANTINE", SMFIR_QUARANTINE,
+    /* Introduced with Sendmail 8.14. */
+    "SMFIR_SKIP", SMFIR_SKIP,
+    "SMFIR_CHGFROM", SMFIR_CHGFROM,
+    "SMFIR_ADDRCPT_PAR", SMFIR_ADDRCPT_PAR,
+    "SMFIR_SETSYMLIST", SMFIR_SETSYMLIST,
+    0, 0,
+};
+
+ /*
+  * Commands that the filter does not want to receive, and replies that the
+  * filter will not send. Plus some other random stuff.
+  */
+#define SMFIP_NOCONNECT		(1L<<0)	/* filter does not want connect info */
+#define SMFIP_NOHELO		(1L<<1)	/* filter does not want HELO info */
+#define SMFIP_NOMAIL		(1L<<2)	/* filter does not want MAIL info */
+#define SMFIP_NORCPT		(1L<<3)	/* filter does not want RCPT info */
+#define SMFIP_NOBODY		(1L<<4)	/* filter does not want body */
+#define SMFIP_NOHDRS		(1L<<5)	/* filter does not want headers */
+#define SMFIP_NOEOH		(1L<<6)	/* filter does not want EOH */
+#define SMFIP_NR_HDR		(1L<<7)	/* filter won't reply for header */
+#define SMFIP_NOHREPL		SMFIP_NR_HDR
+#define SMFIP_NOUNKNOWN 	(1L<<8)	/* filter does not want unknown cmd */
+#define SMFIP_NODATA		(1L<<9)	/* filter does not want DATA */
+ /* Introduced with Sendmail 8.14. */
+#define SMFIP_SKIP		(1L<<10)/* MTA supports SMFIR_SKIP */
+#define SMFIP_RCPT_REJ		(1L<<11)/* filter wants rejected RCPTs */
+#define SMFIP_NR_CONN		(1L<<12)/* filter won't reply for connect */
+#define SMFIP_NR_HELO		(1L<<13)/* filter won't reply for HELO */
+#define SMFIP_NR_MAIL		(1L<<14)/* filter won't reply for MAIL */
+#define SMFIP_NR_RCPT		(1L<<15)/* filter won't reply for RCPT */
+#define SMFIP_NR_DATA		(1L<<16)/* filter won't reply for DATA */
+#define SMFIP_NR_UNKN		(1L<<17)/* filter won't reply for UNKNOWN */
+#define SMFIP_NR_EOH		(1L<<18)/* filter won't reply for eoh */
+#define SMFIP_NR_BODY		(1L<<19)/* filter won't reply for body chunk */
+#define SMFIP_HDR_LEADSPC	(1L<<20)/* header value has leading space */
+
+#define SMFIP_NOSEND_MASK \
+	(SMFIP_NOCONNECT | SMFIP_NOHELO | SMFIP_NOMAIL | SMFIP_NORCPT \
+	| SMFIP_NOBODY | SMFIP_NOHDRS | SMFIP_NOEOH | SMFIP_NOUNKNOWN \
+	| SMFIP_NODATA)
+
+#define SMFIP_NOREPLY_MASK \
+	(SMFIP_NR_CONN | SMFIP_NR_HELO | SMFIP_NR_MAIL | SMFIP_NR_RCPT \
+	| SMFIP_NR_DATA | SMFIP_NR_UNKN | SMFIP_NR_HDR | SMFIP_NR_EOH | \
+	SMFIP_NR_BODY)
+
+static const NAME_MASK smfip_table[] = {
+    "SMFIP_NOCONNECT", SMFIP_NOCONNECT,
+    "SMFIP_NOHELO", SMFIP_NOHELO,
+    "SMFIP_NOMAIL", SMFIP_NOMAIL,
+    "SMFIP_NORCPT", SMFIP_NORCPT,
+    "SMFIP_NOBODY", SMFIP_NOBODY,
+    "SMFIP_NOHDRS", SMFIP_NOHDRS,
+    "SMFIP_NOEOH", SMFIP_NOEOH,
+    "SMFIP_NR_HDR", SMFIP_NR_HDR,
+    "SMFIP_NOUNKNOWN", SMFIP_NOUNKNOWN,
+    "SMFIP_NODATA", SMFIP_NODATA,
+    /* Introduced with Sendmail 8.14. */
+    "SMFIP_SKIP", SMFIP_SKIP,
+    "SMFIP_RCPT_REJ", SMFIP_RCPT_REJ,
+    "SMFIP_NR_CONN", SMFIP_NR_CONN,
+    "SMFIP_NR_HELO", SMFIP_NR_HELO,
+    "SMFIP_NR_MAIL", SMFIP_NR_MAIL,
+    "SMFIP_NR_RCPT", SMFIP_NR_RCPT,
+    "SMFIP_NR_DATA", SMFIP_NR_DATA,
+    "SMFIP_NR_UNKN", SMFIP_NR_UNKN,
+    "SMFIP_NR_EOH", SMFIP_NR_EOH,
+    "SMFIP_NR_BODY", SMFIP_NR_BODY,
+    "SMFIP_HDR_LEADSPC", SMFIP_HDR_LEADSPC,
+    0, 0,
+};
+
+ /*
+  * Options that the filter may send at initial handshake time, and message
+  * modifications that the filter may request at the end of the message body.
+  */
+#define SMFIF_ADDHDRS		(1L<<0)	/* filter may add headers */
+#define SMFIF_CHGBODY		(1L<<1)	/* filter may replace body */
+#define SMFIF_ADDRCPT		(1L<<2)	/* filter may add recipients */
+#define SMFIF_DELRCPT		(1L<<3)	/* filter may delete recipients */
+#define SMFIF_CHGHDRS		(1L<<4)	/* filter may change/delete headers */
+#define SMFIF_QUARANTINE 	(1L<<5)	/* filter may quarantine envelope */
+ /* Introduced with Sendmail 8.14. */
+#define SMFIF_CHGFROM		(1L<<6)	/* filter may replace sender */
+#define SMFIF_ADDRCPT_PAR	(1L<<7)	/* filter may add recipients + args */
+#define SMFIF_SETSYMLIST	(1L<<8)	/* filter may send macro names */
+
+static const NAME_MASK smfif_table[] = {
+    "SMFIF_ADDHDRS", SMFIF_ADDHDRS,
+    "SMFIF_CHGBODY", SMFIF_CHGBODY,
+    "SMFIF_ADDRCPT", SMFIF_ADDRCPT,
+    "SMFIF_DELRCPT", SMFIF_DELRCPT,
+    "SMFIF_CHGHDRS", SMFIF_CHGHDRS,
+    "SMFIF_QUARANTINE", SMFIF_QUARANTINE,
+    /* Introduced with Sendmail 8.14. */
+    "SMFIF_CHGFROM", SMFIF_CHGFROM,
+    "SMFIF_ADDRCPT_PAR", SMFIF_ADDRCPT_PAR,
+    "SMFIF_SETSYMLIST", SMFIF_SETSYMLIST,
+    0, 0,
+};
+
+ /*
+  * Network protocol families, used when sending CONNECT information.
+  */
+#define SMFIA_UNKNOWN		'U'	/* unknown */
+#define SMFIA_UNIX		'L'	/* unix/local */
+#define SMFIA_INET		'4'	/* inet */
+#define SMFIA_INET6		'6'	/* inet6 */
+
+ /*
+  * External macro class numbers, to identify the optional macro name lists
+  * that may be sent after the initial negotiation header.
+  */
+#define SMFIM_CONNECT	0		/* macros for connect */
+#define SMFIM_HELO	1		/* macros for HELO */
+#define SMFIM_ENVFROM	2		/* macros for MAIL */
+#define SMFIM_ENVRCPT	3		/* macros for RCPT */
+#define SMFIM_DATA	4		/* macros for DATA */
+#define SMFIM_EOM	5		/* macros for end-of-message */
+#define SMFIM_EOH	6		/* macros for end-of-header */
+
+static const NAME_CODE smfim_table[] = {
+    "SMFIM_CONNECT", SMFIM_CONNECT,
+    "SMFIM_HELO", SMFIM_HELO,
+    "SMFIM_ENVFROM", SMFIM_ENVFROM,
+    "SMFIM_ENVRCPT", SMFIM_ENVRCPT,
+    "SMFIM_DATA", SMFIM_DATA,
+    "SMFIM_EOM", SMFIM_EOM,
+    "SMFIM_EOH", SMFIM_EOH,
+    0, 0,
+};
+
+ /*
+  * Mapping from external macro class numbers to our internal MILTER_MACROS
+  * structure members, without using a switch statement.
+  */
+static const size_t milter8_macro_offsets[] = {
+    offsetof(MILTER_MACROS, conn_macros),	/* SMFIM_CONNECT */
+    offsetof(MILTER_MACROS, helo_macros),	/* SMFIM_HELO */
+    offsetof(MILTER_MACROS, mail_macros),	/* SMFIM_ENVFROM */
+    offsetof(MILTER_MACROS, rcpt_macros),	/* SMFIM_ENVRCPT */
+    offsetof(MILTER_MACROS, data_macros),	/* SMFIM_DATA */
+    offsetof(MILTER_MACROS, eod_macros),/* Note: SMFIM_EOM < SMFIM_EOH */
+    offsetof(MILTER_MACROS, eoh_macros),/* Note: SMFIM_EOH > SMFIM_EOM */
+};
+
+#define MILTER8_MACRO_PTR(__macros, __class) \
+	((char **) (((char *) (__macros)) + milter8_macro_offsets[(__class)]))
+
+ /*
+  * How much buffer space is available for sending body content.
+  */
+#define MILTER_CHUNK_SIZE	65535	/* body chunk size */
+
+/*#define msg_verbose 2*/
+
+ /*
+  * Sendmail 8 mail filter client.
+  */
+typedef struct {
+    MILTER  m;				/* parent class */
+    int     conn_timeout;		/* connect timeout */
+    int     cmd_timeout;		/* per-command timeout */
+    int     msg_timeout;		/* content inspection timeout */
+    char   *protocol;			/* protocol version/extension */
+    char   *def_action;			/* action if unavailable */
+    int     version;			/* application protocol version */
+    int     rq_mask;			/* application requests (SMFIF_*) */
+    int     ev_mask;			/* application events (SMFIP_*) */
+    int     np_mask;			/* events outside my protocol version */
+    VSTRING *buf;			/* I/O buffer */
+    VSTRING *body;			/* I/O buffer */
+    VSTREAM *fp;			/* stream or null (closed) */
+
+    /*
+     * Following fields must be reset after successful CONNECT, to avoid
+     * leakage from one use to another.
+     */
+    int     state;			/* MILTER8_STAT_mumble */
+    char   *def_reply;			/* error response or null */
+    int     skip_event_type;		/* skip operations of this type */
+} MILTER8;
+
+ /*
+  * XXX Sendmail 8 libmilter automatically closes the MTA-to-filter socket
+  * when it finds out that the SMTP client has disconnected. Because of this
+  * behavior, Postfix has to open a new MTA-to-filter socket each time an
+  * SMTP client connects.
+  */
+#define LIBMILTER_AUTO_DISCONNECT
+
+ /*
+  * Milter internal state. For the external representation we use SMTP
+  * replies (4XX X.Y.Z text, 5XX X.Y.Z text) and one-letter strings
+  * (H=quarantine, D=discard, S=shutdown).
+  */
+#define MILTER8_STAT_ERROR	1	/* error, must be non-zero */
+#define MILTER8_STAT_CLOSED	2	/* no connection */
+#define MILTER8_STAT_READY	3	/* wait for connect event */
+#define MILTER8_STAT_ENVELOPE	4	/* in envelope */
+#define MILTER8_STAT_MESSAGE	5	/* in message */
+#define MILTER8_STAT_ACCEPT_CON	6	/* accept all commands */
+#define MILTER8_STAT_ACCEPT_MSG	7	/* accept one message */
+#define MILTER8_STAT_REJECT_CON	8	/* reject all commands */
+
+ /*
+  * Protocol formatting requests. Note: the terms "long" and "short" refer to
+  * the data types manipulated by htonl(), htons() and friends. These types
+  * are network specific, not host platform specific.
+  */
+#define MILTER8_DATA_END	0	/* no more arguments */
+#define MILTER8_DATA_HLONG	1	/* host long */
+#define MILTER8_DATA_BUFFER	2	/* network-formatted buffer */
+#define MILTER8_DATA_STRING	3	/* null-terminated string */
+#define MILTER8_DATA_NSHORT	4	/* network short */
+#define MILTER8_DATA_ARGV	5	/* array of null-terminated strings */
+#define MILTER8_DATA_OCTET	6	/* byte */
+#define MILTER8_DATA_MORE	7	/* more arguments in next call */
+
+ /*
+  * We don't accept insane amounts of data.
+  */
+#define XXX_MAX_DATA	(INT_MAX / 2)
+#define XXX_TIMEOUT	10
+
+ /*
+  * We implement the protocol up to and including version 6, and configure in
+  * main.cf what protocol version we will use. The version is the first data
+  * item in the SMFIC_OPTNEG packet.
+  * 
+  * We must send only events that are defined for the specified protocol
+  * version. Libmilter may disconnect when we send unexpected events.
+  * 
+  * The following events are supported in all our milter protocol versions.
+  */
+#define MILTER8_V2_PROTO_MASK \
+	(SMFIP_NOCONNECT | SMFIP_NOHELO | SMFIP_NOMAIL | SMFIP_NORCPT | \
+	SMFIP_NOBODY | SMFIP_NOHDRS | SMFIP_NOEOH)
+
+ /*
+  * Events supported by later versions.
+  */
+#define MILTER8_V3_PROTO_MASK	(MILTER8_V2_PROTO_MASK | SMFIP_NOUNKNOWN)
+#define MILTER8_V4_PROTO_MASK	(MILTER8_V3_PROTO_MASK | SMFIP_NODATA)
+#define MILTER8_V6_PROTO_MASK \
+	(MILTER8_V4_PROTO_MASK | SMFIP_SKIP | SMFIP_RCPT_REJ \
+	| SMFIP_NOREPLY_MASK | SMFIP_HDR_LEADSPC)
+
+ /*
+  * What events we can send to the milter application. The milter8_protocol
+  * parameter can specify a protocol version as well as protocol extensions
+  * such as "no_header_reply", a feature that speeds up the protocol by not
+  * sending a filter reply for every individual message header.
+  * 
+  * This looks unclean because the user can specify multiple protocol versions,
+  * but that is taken care of by the table that follows this one.
+  * 
+  * XXX Is this still needed? Sendmail 8.14 provides a proper way to negotiate
+  * what replies the mail filter will send.
+  * 
+  * XXX Keep this table in reverse numerical order. This is needed by the code
+  * that implements compatibility with older Milter protocol versions.
+  */
+static const NAME_CODE milter8_event_masks[] = {
+    "6", MILTER8_V6_PROTO_MASK,
+    "4", MILTER8_V4_PROTO_MASK,
+    "3", MILTER8_V3_PROTO_MASK,
+    "2", MILTER8_V2_PROTO_MASK,
+    "no_header_reply", SMFIP_NOHREPL,
+    0, -1,
+};
+
+ /*
+  * The following table lets us use the same milter8_protocol parameter
+  * setting to derive the protocol version number. In this case we ignore
+  * protocol extensions such as "no_header_reply", and require that exactly
+  * one version number is specified.
+  */
+static const NAME_CODE milter8_versions[] = {
+    "2", 2,
+    "3", 3,
+    "4", 4,
+    "6", 6,
+    "no_header_reply", 0,
+    0, -1,
+};
+
+/* SLMs. */
+
+#define STR(x) vstring_str(x)
+#define LEN(x) VSTRING_LEN(x)
+
+/* milter8_def_reply - set persistent response */
+
+static const char *milter8_def_reply(MILTER8 *milter, const char *reply)
+{
+    if (milter->def_reply)
+	myfree(milter->def_reply);
+    milter->def_reply = reply ? mystrdup(reply) : 0;
+    return (milter->def_reply);
+}
+
+/* milter8_conf_error - local/remote configuration error */
+
+static int milter8_conf_error(MILTER8 *milter)
+{
+    const char *reply;
+
+    /*
+     * XXX When the cleanup server closes its end of the Milter socket while
+     * editing a queue file, the SMTP server is left out of sync with the
+     * Milter. Sending an ABORT to the Milters will not restore
+     * synchronization, because there may be any number of Milter replies
+     * already in flight. Workaround: poison the socket and force the SMTP
+     * server to abandon it.
+     */
+    if (milter->fp != 0) {
+	(void) shutdown(vstream_fileno(milter->fp), SHUT_RDWR);
+	(void) vstream_fclose(milter->fp);
+	milter->fp = 0;
+    }
+    if (strcasecmp(milter->def_action, "accept") == 0) {
+	reply = 0;
+    } else if (strcasecmp(milter->def_action, "quarantine") == 0) {
+	reply = "H";
+    } else {
+	reply = "451 4.3.5 Server configuration problem - try again later";
+    }
+    milter8_def_reply(milter, reply);
+    return (milter->state = MILTER8_STAT_ERROR);
+}
+
+/* milter8_comm_error - read/write/format communication error */
+
+static int milter8_comm_error(MILTER8 *milter)
+{
+    const char *reply;
+
+    /*
+     * XXX When the cleanup server closes its end of the Milter socket while
+     * editing a queue file, the SMTP server is left out of sync with the
+     * Milter. Sending an ABORT to the Milters will not restore
+     * synchronization, because there may be any number of Milter replies
+     * already in flight. Workaround: poison the socket and force the SMTP
+     * server to abandon it.
+     */
+    if (milter->fp != 0) {
+	(void) shutdown(vstream_fileno(milter->fp), SHUT_RDWR);
+	(void) vstream_fclose(milter->fp);
+	milter->fp = 0;
+    }
+    if (strcasecmp(milter->def_action, "accept") == 0) {
+	reply = 0;
+    } else if (strcasecmp(milter->def_action, "reject") == 0) {
+	reply = "550 5.5.0 Service unavailable";
+    } else if (strcasecmp(milter->def_action, "tempfail") == 0) {
+	reply = "451 4.7.1 Service unavailable - try again later";
+    } else if (strcasecmp(milter->def_action, "quarantine") == 0) {
+	reply = "H";
+    } else {
+	msg_warn("milter %s: unrecognized default action: %s",
+		 milter->m.name, milter->def_action);
+	reply = "451 4.3.5 Server configuration problem - try again later";
+    }
+    milter8_def_reply(milter, reply);
+    return (milter->state = MILTER8_STAT_ERROR);
+}
+
+/* milter8_close_stream - close stream to milter application */
+
+static void milter8_close_stream(MILTER8 *milter)
+{
+    if (milter->fp != 0) {
+	(void) vstream_fclose(milter->fp);
+	milter->fp = 0;
+    }
+    milter->state = MILTER8_STAT_CLOSED;
+}
+
+/* milter8_read_resp - receive command code now, receive data later */
+
+static int milter8_read_resp(MILTER8 *milter, int event, unsigned char *command,
+			             ssize_t *data_len)
+{
+    UINT32_TYPE len;
+    ssize_t pkt_len;
+    const char *smfic_name;
+    int     cmd;
+
+    /*
+     * Receive the packet length.
+     */
+    if ((vstream_fread(milter->fp, (void *) &len, UINT32_SIZE))
+	!= UINT32_SIZE) {
+	smfic_name = str_name_code(smfic_table, event);
+	msg_warn("milter %s: can't read %s reply packet header: %m",
+		 milter->m.name, smfic_name != 0 ?
+		 smfic_name : "(unknown MTA event)");
+	return (milter8_comm_error(milter));
+    } else if ((pkt_len = ntohl(len)) < 1) {
+	msg_warn("milter %s: bad packet length: %ld",
+		 milter->m.name, (long) pkt_len);
+	return (milter8_comm_error(milter));
+    } else if (pkt_len > XXX_MAX_DATA) {
+	msg_warn("milter %s: unreasonable packet length: %ld > %ld",
+		 milter->m.name, (long) pkt_len, (long) XXX_MAX_DATA);
+	return (milter8_comm_error(milter));
+    }
+
+    /*
+     * Receive the command code.
+     */
+    else if ((cmd = VSTREAM_GETC(milter->fp)) == VSTREAM_EOF) {
+	msg_warn("milter %s: EOF while reading command code: %m",
+		 milter->m.name);
+	return (milter8_comm_error(milter));
+    }
+
+    /*
+     * All is well.
+     */
+    else {
+	*command = cmd;
+	*data_len = pkt_len - 1;
+	return (0);
+    }
+}
+
+static int milter8_read_data(MILTER8 *milter, ssize_t *data_len,...);
+
+/* vmilter8_read_data - read command data */
+
+static int vmilter8_read_data(MILTER8 *milter, ssize_t *data_len, va_list ap)
+{
+    const char *myname = "milter8_read_data";
+    int     arg_type;
+    UINT32_TYPE net_long;
+    UINT32_TYPE *host_long_ptr;
+    VSTRING *buf;
+    int     ch;
+
+    while ((arg_type = va_arg(ap, int)) > 0 && arg_type != MILTER8_DATA_MORE) {
+	switch (arg_type) {
+
+	    /*
+	     * Host order long.
+	     */
+	case MILTER8_DATA_HLONG:
+	    if (*data_len < UINT32_SIZE) {
+		msg_warn("milter %s: input packet too short for network long",
+			 milter->m.name);
+		return (milter8_comm_error(milter));
+	    }
+	    host_long_ptr = va_arg(ap, UINT32_TYPE *);
+	    if (vstream_fread(milter->fp, (void *) &net_long, UINT32_SIZE)
+		!= UINT32_SIZE) {
+		msg_warn("milter %s: EOF while reading network long: %m",
+			 milter->m.name);
+		return (milter8_comm_error(milter));
+	    }
+	    *data_len -= UINT32_SIZE;
+	    *host_long_ptr = ntohl(net_long);
+	    break;
+
+	    /*
+	     * Raw on-the-wire format, without explicit null terminator.
+	     */
+	case MILTER8_DATA_BUFFER:
+	    if (*data_len < 0) {
+		msg_warn("milter %s: no data in input packet", milter->m.name);
+		return (milter8_comm_error(milter));
+	    }
+	    buf = va_arg(ap, VSTRING *);
+	    if (vstream_fread_buf(milter->fp, buf, *data_len)
+		!= *data_len) {
+		msg_warn("milter %s: EOF while reading data: %m", milter->m.name);
+		return (milter8_comm_error(milter));
+	    }
+	    *data_len = 0;
+	    break;
+
+	    /*
+	     * Pointer to null-terminated string.
+	     */
+	case MILTER8_DATA_STRING:
+	    if (*data_len < 1) {
+		msg_warn("milter %s: packet too short for string",
+			 milter->m.name);
+		return (milter8_comm_error(milter));
+	    }
+	    buf = va_arg(ap, VSTRING *);
+	    VSTRING_RESET(buf);
+	    for (;;) {
+		if ((ch = VSTREAM_GETC(milter->fp)) == VSTREAM_EOF) {
+		    msg_warn("%s: milter %s: EOF while reading string: %m",
+			     myname, milter->m.name);
+		    return (milter8_comm_error(milter));
+		}
+		*data_len -= 1;
+		if (ch == 0)
+		    break;
+		VSTRING_ADDCH(buf, ch);
+		if (*data_len <= 0) {
+		    msg_warn("%s: milter %s: missing string null termimator",
+			     myname, milter->m.name);
+		    return (milter8_comm_error(milter));
+		}
+	    }
+	    VSTRING_TERMINATE(buf);
+	    break;
+
+	    /*
+	     * Error.
+	     */
+	default:
+	    msg_panic("%s: unknown argument type: %d", myname, arg_type);
+	}
+    }
+
+    /*
+     * Sanity checks. We may have excess data when the sender is confused. We
+     * may have a negative count when we're confused ourselves.
+     */
+    if (arg_type != MILTER8_DATA_MORE && *data_len > 0) {
+	msg_warn("%s: left-over data %ld bytes", myname, (long) *data_len);
+	return (milter8_comm_error(milter));
+    }
+    if (*data_len < 0)
+	msg_panic("%s: bad left-over data count %ld",
+		  myname, (long) *data_len);
+    return (0);
+}
+
+/* milter8_read_data - read command data */
+
+static int milter8_read_data(MILTER8 *milter, ssize_t *data_len,...)
+{
+    va_list ap;
+    int     ret;
+
+    va_start(ap, data_len);
+    ret = vmilter8_read_data(milter, data_len, ap);
+    va_end(ap);
+    return (ret);
+}
+
+/* vmilter8_size_data - compute command data length */
+
+static ssize_t vmilter8_size_data(va_list ap)
+{
+    const char *myname = "vmilter8_size_data";
+    ssize_t data_len;
+    int     arg_type;
+    VSTRING *buf;
+    const char *str;
+    const char **cpp;
+
+    /*
+     * Compute data size.
+     */
+    for (data_len = 0; (arg_type = va_arg(ap, int)) > 0; /* void */ ) {
+	switch (arg_type) {
+
+	    /*
+	     * Host order long.
+	     */
+	case MILTER8_DATA_HLONG:
+	    (void) va_arg(ap, UINT32_TYPE);
+	    data_len += UINT32_SIZE;
+	    break;
+
+	    /*
+	     * Raw on-the-wire format.
+	     */
+	case MILTER8_DATA_BUFFER:
+	    buf = va_arg(ap, VSTRING *);
+	    data_len += LEN(buf);
+	    break;
+
+	    /*
+	     * Pointer to null-terminated string.
+	     */
+	case MILTER8_DATA_STRING:
+	    str = va_arg(ap, char *);
+	    data_len += strlen(str) + 1;
+	    break;
+
+	    /*
+	     * Array of pointers to null-terminated strings.
+	     */
+	case MILTER8_DATA_ARGV:
+	    for (cpp = va_arg(ap, const char **); *cpp; cpp++)
+		data_len += strlen(*cpp) + 1;
+	    break;
+
+	    /*
+	     * Network order short, promoted to int.
+	     */
+	case MILTER8_DATA_NSHORT:
+	    (void) va_arg(ap, unsigned);
+	    data_len += UINT16_SIZE;
+	    break;
+
+	    /*
+	     * Octet, promoted to int.
+	     */
+	case MILTER8_DATA_OCTET:
+	    (void) va_arg(ap, unsigned);
+	    data_len += 1;
+	    break;
+
+	    /*
+	     * Error.
+	     */
+	default:
+	    msg_panic("%s: bad argument type: %d", myname, arg_type);
+	}
+    }
+    va_end(ap);
+    return (data_len);
+}
+
+/* vmilter8_write_cmd - write command to Sendmail 8 Milter */
+
+static int vmilter8_write_cmd(MILTER8 *milter, int command, ssize_t data_len,
+			              va_list ap)
+{
+    const char *myname = "vmilter8_write_cmd";
+    int     arg_type;
+    UINT32_TYPE pkt_len;
+    UINT32_TYPE host_long;
+    UINT32_TYPE net_long;
+    UINT16_TYPE net_short;
+    VSTRING *buf;
+    const char *str;
+    const char **cpp;
+    char    ch;
+
+    /*
+     * Deliver the packet.
+     */
+    if ((pkt_len = 1 + data_len) < 1)
+	msg_panic("%s: bad packet length %d", myname, pkt_len);
+    pkt_len = htonl(pkt_len);
+    (void) vstream_fwrite(milter->fp, (void *) &pkt_len, UINT32_SIZE);
+    (void) VSTREAM_PUTC(command, milter->fp);
+    while ((arg_type = va_arg(ap, int)) > 0) {
+	switch (arg_type) {
+
+	    /*
+	     * Network long.
+	     */
+	case MILTER8_DATA_HLONG:
+	    host_long = va_arg(ap, UINT32_TYPE);
+	    net_long = htonl(host_long);
+	    (void) vstream_fwrite(milter->fp, (void *) &net_long, UINT32_SIZE);
+	    break;
+
+	    /*
+	     * Raw on-the-wire format.
+	     */
+	case MILTER8_DATA_BUFFER:
+	    buf = va_arg(ap, VSTRING *);
+	    (void) vstream_fwrite(milter->fp, STR(buf), LEN(buf));
+	    break;
+
+	    /*
+	     * Pointer to null-terminated string.
+	     */
+	case MILTER8_DATA_STRING:
+	    str = va_arg(ap, char *);
+	    (void) vstream_fwrite(milter->fp, str, strlen(str) + 1);
+	    break;
+
+	    /*
+	     * Octet, promoted to int.
+	     */
+	case MILTER8_DATA_OCTET:
+	    ch = va_arg(ap, unsigned);
+	    (void) vstream_fwrite(milter->fp, &ch, 1);
+	    break;
+
+	    /*
+	     * Array of pointers to null-terminated strings.
+	     */
+	case MILTER8_DATA_ARGV:
+	    for (cpp = va_arg(ap, const char **); *cpp; cpp++)
+		(void) vstream_fwrite(milter->fp, *cpp, strlen(*cpp) + 1);
+	    break;
+
+	    /*
+	     * Network order short, promoted to int.
+	     */
+	case MILTER8_DATA_NSHORT:
+	    net_short = va_arg(ap, unsigned);
+	    (void) vstream_fwrite(milter->fp, (void *) &net_short, UINT16_SIZE);
+	    break;
+
+	    /*
+	     * Error.
+	     */
+	default:
+	    msg_panic("%s: bad argument type: %d", myname, arg_type);
+	}
+
+	/*
+	 * Report errors immediately.
+	 */
+	if (vstream_ferror(milter->fp)) {
+	    msg_warn("milter %s: error writing command: %m", milter->m.name);
+	    milter8_comm_error(milter);
+	    break;
+	}
+    }
+    va_end(ap);
+    return (milter->state == MILTER8_STAT_ERROR);
+}
+
+/* milter8_write_cmd - write command to Sendmail 8 Milter */
+
+static int milter8_write_cmd(MILTER8 *milter, int command,...)
+{
+    va_list ap;
+    va_list ap2;
+    ssize_t data_len;
+    int     err;
+
+    /*
+     * Initialize argument lists.
+     */
+    va_start(ap, command);
+    VA_COPY(ap2, ap);
+
+    /*
+     * Size the command data.
+     */
+    data_len = vmilter8_size_data(ap);
+    va_end(ap);
+
+    /*
+     * Send the command and data.
+     */
+    err = vmilter8_write_cmd(milter, command, data_len, ap2);
+    va_end(ap2);
+
+    return (err);
+}
+
+/* milter8_event - report event and receive reply */
+
+static const char *milter8_event(MILTER8 *milter, int event,
+				         int skip_event_flag,
+				         int skip_reply,
+				         ARGV *macros,...)
+{
+    const char *myname = "milter8_event";
+    va_list ap;
+    va_list ap2;
+    ssize_t data_len;
+    int     err;
+    unsigned char cmd;
+    ssize_t data_size;
+    const char *smfic_name;
+    const char *smfir_name;
+    MILTERS *parent = milter->m.parent;
+    UINT32_TYPE index;
+    const char *edit_resp = 0;
+    const char *retval = 0;
+    VSTRING *body_line_buf = 0;
+    int     done = 0;
+    int     body_edit_lockout = 0;
+
+#define DONT_SKIP_REPLY	0
+
+    /*
+     * Sanity check.
+     */
+    if (milter->fp == 0 || milter->def_reply != 0) {
+	msg_warn("%s: attempt to send event %s to milter %s after error",
+		 myname,
+		 (smfic_name = str_name_code(smfic_table, event)) != 0 ?
+		 smfic_name : "(unknown MTA event)", milter->m.name);
+	return (milter->def_reply);
+    }
+
+    /*
+     * Skip this event if it doesn't exist in the protocol that I announced.
+     */
+    if ((skip_event_flag & milter->np_mask) != 0) {
+	if (msg_verbose)
+	    msg_info("skipping non-protocol event %s for milter %s",
+		     (smfic_name = str_name_code(smfic_table, event)) != 0 ?
+		     smfic_name : "(unknown MTA event)", milter->m.name);
+	return (milter->def_reply);
+    }
+
+    /*
+     * Skip further events of this type if the filter told us so.
+     */
+    if (milter->skip_event_type != 0) {
+	if (event == milter->skip_event_type) {
+	    if (msg_verbose)
+		msg_info("skipping event %s after SMFIR_SKIP from milter %s",
+		     (smfic_name = str_name_code(smfic_table, event)) != 0 ?
+			 smfic_name : "(unknown MTA event)", milter->m.name);
+	    return (milter->def_reply);
+	} else {
+	    milter->skip_event_type = 0;
+	}
+    }
+
+    /*
+     * Send the macros for this event, even when we're not reporting the
+     * event itself. This does not introduce a performance problem because
+     * we're sending macros and event parameters in one VSTREAM transaction.
+     * 
+     * XXX Is this still necessary?
+     */
+    if (msg_verbose) {
+	VSTRING *buf = vstring_alloc(100);
+
+	if (macros) {
+	    if (macros->argc > 0) {
+		char  **cpp;
+
+		for (cpp = macros->argv; *cpp && cpp[1]; cpp += 2)
+		    vstring_sprintf_append(buf, " %s=%s", *cpp, cpp[1]);
+	    }
+	}
+	msg_info("event: %s; macros:%s",
+		 (smfic_name = str_name_code(smfic_table, event)) != 0 ?
+		 smfic_name : "(unknown MTA event)", *STR(buf) ?
+		 STR(buf) : " (none)");
+	vstring_free(buf);
+    }
+    if (macros) {
+	if (milter8_write_cmd(milter, SMFIC_MACRO,
+			      MILTER8_DATA_OCTET, event,
+			      MILTER8_DATA_ARGV, macros->argv,
+			      MILTER8_DATA_END) != 0)
+	    return (milter->def_reply);
+    }
+
+    /*
+     * Skip this event if the Milter told us not to send it.
+     */
+    if ((skip_event_flag & milter->ev_mask) != 0) {
+	if (msg_verbose)
+	    msg_info("skipping event %s for milter %s",
+		     (smfic_name = str_name_code(smfic_table, event)) != 0 ?
+		     smfic_name : "(unknown MTA event)", milter->m.name);
+	return (milter->def_reply);
+    }
+
+    /*
+     * Initialize argument lists.
+     */
+    va_start(ap, macros);
+    VA_COPY(ap2, ap);
+
+    /*
+     * Compute the command data size. This is necessary because the protocol
+     * sends length before content.
+     */
+    data_len = vmilter8_size_data(ap);
+    va_end(ap);
+
+    /*
+     * Send the command and data.
+     */
+    err = vmilter8_write_cmd(milter, event, data_len, ap2);
+    va_end(ap2);
+
+    /*
+     * C99 requires that we finalize argument lists before returning.
+     */
+    if (err != 0)
+	return (milter->def_reply);
+
+    /*
+     * Special feature: don't wait for one reply per header. This allows us
+     * to send multiple headers in one VSTREAM transaction, and improves
+     * over-all performance.
+     */
+    if (skip_reply) {
+	if (msg_verbose)
+	    msg_info("skipping reply for event %s from milter %s",
+		     (smfic_name = str_name_code(smfic_table, event)) != 0 ?
+		     smfic_name : "(unknown MTA event)", milter->m.name);
+	return (milter->def_reply);
+    }
+
+    /*
+     * Receive the reply or replies.
+     * 
+     * Intercept all loop exits so that we can do post header/body edit
+     * processing.
+     * 
+     * XXX Bound the loop iteration count.
+     * 
+     * In the end-of-body stage, the Milter may reply with one or more queue
+     * file edit requests before it replies with its final decision: accept,
+     * reject, etc. After a local queue file edit error (file too big, media
+     * write error), do not close the Milter socket in the cleanup server.
+     * Instead skip all further Milter replies until the final decision. This
+     * way the Postfix SMTP server stays in sync with the Milter, and Postfix
+     * doesn't have to lose the ability to handle multiple deliveries within
+     * the same SMTP session. This requires that the Postfix SMTP server uses
+     * something other than CLEANUP_STAT_WRITE when it loses contact with the
+     * cleanup server.
+     */
+#define IN_CONNECT_EVENT(e) ((e) == SMFIC_CONNECT || (e) == SMFIC_HELO)
+
+    /*
+     * XXX Don't evaluate this macro's argument multiple times. Since we use
+     * "continue" the macro can't be enclosed in do .. while (0).
+     */
+#define MILTER8_EVENT_BREAK(s) { \
+	retval = (s); \
+	done = 1; \
+	continue; \
+    }
+
+    while (done == 0) {
+	char   *cp;
+	char   *rp;
+	char    ch;
+	char   *next;
+
+	if (milter8_read_resp(milter, event, &cmd, &data_size) != 0)
+	    MILTER8_EVENT_BREAK(milter->def_reply);
+	if (msg_verbose)
+	    msg_info("reply: %s data %ld bytes",
+		     (smfir_name = str_name_code(smfir_table, cmd)) != 0 ?
+		     smfir_name : "unknown", (long) data_size);
+
+	/*
+	 * Handle unfinished message body replacement first.
+	 * 
+	 * XXX When SMFIR_REPLBODY is followed by some different request, we
+	 * assume that the body replacement operation is complete. The queue
+	 * file editing implementation currently does not support sending
+	 * part 1 of the body replacement text, doing some other queue file
+	 * updates, and then sending part 2 of the body replacement text. To
+	 * avoid loss of data, we log an error when SMFIR_REPLBODY requests
+	 * are alternated with other requests.
+	 */
+	if (body_line_buf != 0 && cmd != SMFIR_REPLBODY) {
+	    /* In case the last body replacement line didn't end in CRLF. */
+	    if (edit_resp == 0 && LEN(body_line_buf) > 0)
+		edit_resp = parent->repl_body(parent->chg_context,
+					      MILTER_BODY_LINE,
+					      REC_TYPE_NORM,
+					      body_line_buf);
+	    if (edit_resp == 0)
+		edit_resp = parent->repl_body(parent->chg_context,
+					      MILTER_BODY_END,
+					      /* unused*/ 0,
+					      (VSTRING *) 0);
+	    body_edit_lockout = 1;
+	    vstring_free(body_line_buf);
+	    body_line_buf = 0;
+	}
+	switch (cmd) {
+
+	    /*
+	     * Still working on it.
+	     */
+	case SMFIR_PROGRESS:
+	    if (data_size != 0)
+		break;
+	    continue;
+
+	    /*
+	     * Decision: continue processing.
+	     */
+	case SMFIR_CONTINUE:
+	    if (data_size != 0)
+		break;
+	    MILTER8_EVENT_BREAK(milter->def_reply);
+
+	    /*
+	     * Decision: accept this message, or accept all further commands
+	     * in this SMTP connection. This decision is final (i.e. Sendmail
+	     * 8 changes receiver state).
+	     */
+	case SMFIR_ACCEPT:
+	    if (data_size != 0)
+		break;
+	    if (IN_CONNECT_EVENT(event)) {
+#ifdef LIBMILTER_AUTO_DISCONNECT
+		milter8_close_stream(milter);
+#endif
+		/* No more events for this SMTP connection. */
+		milter->state = MILTER8_STAT_ACCEPT_CON;
+	    } else {
+		/* No more events for this message. */
+		milter->state = MILTER8_STAT_ACCEPT_MSG;
+	    }
+	    MILTER8_EVENT_BREAK(milter->def_reply);
+
+	    /*
+	     * Decision: accept and silently discard this message. According
+	     * to the milter API documentation there will be no action when
+	     * this is requested by a connection-level function. This
+	     * decision is final (i.e. Sendmail 8 changes receiver state).
+	     */
+	case SMFIR_DISCARD:
+	    if (data_size != 0)
+		break;
+	    if (IN_CONNECT_EVENT(event)) {
+		msg_warn("milter %s: DISCARD action is not allowed "
+			 "for connect or helo", milter->m.name);
+		MILTER8_EVENT_BREAK(milter->def_reply);
+	    } else {
+		/* No more events for this message. */
+		milter->state = MILTER8_STAT_ACCEPT_MSG;
+		MILTER8_EVENT_BREAK("D");
+	    }
+
+	    /*
+	     * Decision: reject connection, message or recipient. This
+	     * decision is final (i.e. Sendmail 8 changes receiver state).
+	     */
+	case SMFIR_REJECT:
+	    if (data_size != 0)
+		break;
+	    if (IN_CONNECT_EVENT(event)) {
+#ifdef LIBMILTER_AUTO_DISCONNECT
+		milter8_close_stream(milter);
+#endif
+		milter->state = MILTER8_STAT_REJECT_CON;
+		MILTER8_EVENT_BREAK(milter8_def_reply(milter, "550 5.7.1 Command rejected"));
+	    } else {
+		MILTER8_EVENT_BREAK("550 5.7.1 Command rejected");
+	    }
+
+	    /*
+	     * Decision: tempfail. This decision is final (i.e. Sendmail 8
+	     * changes receiver state).
+	     */
+	case SMFIR_TEMPFAIL:
+	    if (data_size != 0)
+		break;
+	    if (IN_CONNECT_EVENT(event)) {
+#ifdef LIBMILTER_AUTO_DISCONNECT
+		milter8_close_stream(milter);
+#endif
+		milter->state = MILTER8_STAT_REJECT_CON;
+		MILTER8_EVENT_BREAK(milter8_def_reply(milter,
+			"451 4.7.1 Service unavailable - try again later"));
+	    } else {
+		MILTER8_EVENT_BREAK("451 4.7.1 Service unavailable - try again later");
+	    }
+
+	    /*
+	     * Decision: disconnect. This decision is final (i.e. Sendmail 8
+	     * changes receiver state).
+	     */
+	case SMFIR_SHUTDOWN:
+	    if (data_size != 0)
+		break;
+#ifdef LIBMILTER_AUTO_DISCONNECT
+	    milter8_close_stream(milter);
+#endif
+	    milter->state = MILTER8_STAT_REJECT_CON;
+	    MILTER8_EVENT_BREAK(milter8_def_reply(milter, "S"));
+
+	    /*
+	     * Decision: "ddd d.d+.d+ text". This decision is final (i.e.
+	     * Sendmail 8 changes receiver state). Note: the reply may be in
+	     * multi-line SMTP format.
+	     * 
+	     * XXX Sendmail compatibility: sendmail 8 uses the reply as a format
+	     * string; therefore any '%' characters in the reply are doubled.
+	     * Postfix doesn't use replies as format strings; we replace '%%'
+	     * by '%', and remove single (i.e. invalid) '%' characters.
+	     */
+	case SMFIR_REPLYCODE:
+	    if (milter8_read_data(milter, &data_size,
+				  MILTER8_DATA_BUFFER, milter->buf,
+				  MILTER8_DATA_END) != 0)
+		MILTER8_EVENT_BREAK(milter->def_reply);
+	    /* XXX Enforce this for each line of a multi-line reply. */
+	    if ((STR(milter->buf)[0] != '4' && STR(milter->buf)[0] != '5')
+		|| !ISDIGIT(STR(milter->buf)[1])
+		|| !ISDIGIT(STR(milter->buf)[2])
+		|| (STR(milter->buf)[3] != ' ' && STR(milter->buf)[3] != '-')
+		|| (ISDIGIT(STR(milter->buf)[4])
+		    && (STR(milter->buf)[4] != STR(milter->buf)[0]))) {
+		msg_warn("milter %s: malformed reply: %s",
+			 milter->m.name, STR(milter->buf));
+		milter8_conf_error(milter);
+		MILTER8_EVENT_BREAK(milter->def_reply);
+	    }
+	    if ((rp = cp = strchr(STR(milter->buf), '%')) != 0) {
+		for (;;) {
+		    if ((ch = *cp++) == '%')
+			ch = *cp++;
+		    *rp++ = ch;
+		    if (ch == 0)
+			break;
+		}
+	    }
+	    if (var_soft_bounce) {
+		for (cp = STR(milter->buf); /* void */ ; cp = next) {
+		    if (cp[0] == '5') {
+			cp[0] = '4';
+			if (cp[4] == '5')
+			    cp[4] = '4';
+		    }
+		    if ((next = strstr(cp, "\r\n")) == 0)
+			break;
+		    next += 2;
+		}
+	    }
+	    if (IN_CONNECT_EVENT(event)) {
+#ifdef LIBMILTER_AUTO_DISCONNECT
+		milter8_close_stream(milter);
+#endif
+		milter->state = MILTER8_STAT_REJECT_CON;
+		MILTER8_EVENT_BREAK(milter8_def_reply(milter, STR(milter->buf)));
+	    } else {
+		MILTER8_EVENT_BREAK(STR(milter->buf));
+	    }
+
+	    /*
+	     * Decision: quarantine. In Sendmail 8.13 this does not imply a
+	     * transition in the receiver state (reply, reject, tempfail,
+	     * accept, discard). We should not transition, either, otherwise
+	     * we get out of sync.
+	     */
+	case SMFIR_QUARANTINE:
+	    /* XXX What to do with the "reason" text? */
+	    if (milter8_read_data(milter, &data_size,
+				  MILTER8_DATA_BUFFER, milter->buf,
+				  MILTER8_DATA_END) != 0)
+		MILTER8_EVENT_BREAK(milter->def_reply);
+	    milter8_def_reply(milter, "H");
+	    continue;
+
+	    /*
+	     * Decision: skip further events of this type.
+	     */
+	case SMFIR_SKIP:
+	    if (data_size != 0)
+		break;
+	    milter->skip_event_type = event;
+	    MILTER8_EVENT_BREAK(milter->def_reply);
+
+	    /*
+	     * Modification request or error.
+	     */
+	default:
+	    if (event == SMFIC_BODYEOB) {
+		switch (cmd) {
+
+#define MILTER8_HDR_SPACE(m) (((m)->ev_mask & SMFIP_HDR_LEADSPC) ? "" : " ")
+
+		    /*
+		     * Modification request: replace, insert or delete
+		     * header. Index 1 means the first instance.
+		     */
+		case SMFIR_CHGHEADER:
+		    if (milter8_read_data(milter, &data_size,
+					  MILTER8_DATA_HLONG, &index,
+					  MILTER8_DATA_STRING, milter->buf,
+					  MILTER8_DATA_STRING, milter->body,
+					  MILTER8_DATA_END) != 0)
+			MILTER8_EVENT_BREAK(milter->def_reply);
+		    /* Skip to the next request after previous edit error. */
+		    if (edit_resp)
+			continue;
+		    /* XXX Sendmail 8 compatibility. */
+		    if (index == 0)
+			index = 1;
+		    if ((ssize_t) index < 1) {
+			msg_warn("milter %s: bad change header index: %ld",
+				 milter->m.name, (long) index);
+			milter8_conf_error(milter);
+			MILTER8_EVENT_BREAK(milter->def_reply);
+		    }
+		    if (LEN(milter->buf) == 0) {
+			msg_warn("milter %s: null change header name",
+				 milter->m.name);
+			milter8_conf_error(milter);
+			MILTER8_EVENT_BREAK(milter->def_reply);
+		    }
+		    if (STR(milter->body)[0])
+			edit_resp = parent->upd_header(parent->chg_context,
+						       (ssize_t) index,
+						       STR(milter->buf),
+						  MILTER8_HDR_SPACE(milter),
+						       STR(milter->body));
+		    else
+			edit_resp = parent->del_header(parent->chg_context,
+						       (ssize_t) index,
+						       STR(milter->buf));
+		    continue;
+
+		    /*
+		     * Modification request: append header.
+		     */
+		case SMFIR_ADDHEADER:
+		    if (milter8_read_data(milter, &data_size,
+					  MILTER8_DATA_STRING, milter->buf,
+					  MILTER8_DATA_STRING, milter->body,
+					  MILTER8_DATA_END) != 0)
+			MILTER8_EVENT_BREAK(milter->def_reply);
+		    /* Skip to the next request after previous edit error. */
+		    if (edit_resp)
+			continue;
+		    edit_resp = parent->add_header(parent->chg_context,
+						   STR(milter->buf),
+						   MILTER8_HDR_SPACE(milter),
+						   STR(milter->body));
+		    continue;
+
+		    /*
+		     * Modification request: insert header. With Sendmail 8,
+		     * index 0 means the top-most header. We use 1-based
+		     * indexing for consistency with header change
+		     * operations.
+		     */
+		case SMFIR_INSHEADER:
+		    if (milter8_read_data(milter, &data_size,
+					  MILTER8_DATA_HLONG, &index,
+					  MILTER8_DATA_STRING, milter->buf,
+					  MILTER8_DATA_STRING, milter->body,
+					  MILTER8_DATA_END) != 0)
+			MILTER8_EVENT_BREAK(milter->def_reply);
+		    /* Skip to the next request after previous edit error. */
+		    if (edit_resp)
+			continue;
+		    if ((ssize_t) index + 1 < 1) {
+			msg_warn("milter %s: bad insert header index: %ld",
+				 milter->m.name, (long) index);
+			milter8_conf_error(milter);
+			MILTER8_EVENT_BREAK(milter->def_reply);
+		    }
+		    edit_resp = parent->ins_header(parent->chg_context,
+						   (ssize_t) index + 1,
+						   STR(milter->buf),
+						   MILTER8_HDR_SPACE(milter),
+						   STR(milter->body));
+		    continue;
+
+		    /*
+		     * Modification request: replace sender, with optional
+		     * ESMTP args.
+		     */
+		case SMFIR_CHGFROM:
+		    if (milter8_read_data(milter, &data_size,
+					  MILTER8_DATA_STRING, milter->buf,
+					  MILTER8_DATA_MORE) != 0)
+			MILTER8_EVENT_BREAK(milter->def_reply);
+		    if (data_size > 0) {
+			if (milter8_read_data(milter, &data_size,
+					  MILTER8_DATA_STRING, milter->body,
+					      MILTER8_DATA_END) != 0)
+			    MILTER8_EVENT_BREAK(milter->def_reply);
+		    } else {
+			VSTRING_RESET(milter->body);
+			VSTRING_TERMINATE(milter->body);
+		    }
+		    /* Skip to the next request after previous edit error. */
+		    if (edit_resp)
+			continue;
+		    edit_resp = parent->chg_from(parent->chg_context,
+						 STR(milter->buf),
+						 STR(milter->body));
+		    continue;
+
+		    /*
+		     * Modification request: append recipient.
+		     */
+		case SMFIR_ADDRCPT:
+		    if (milter8_read_data(milter, &data_size,
+					  MILTER8_DATA_STRING, milter->buf,
+					  MILTER8_DATA_END) != 0)
+			MILTER8_EVENT_BREAK(milter->def_reply);
+		    /* Skip to the next request after previous edit error. */
+		    if (edit_resp)
+			continue;
+		    edit_resp = parent->add_rcpt(parent->chg_context,
+						 STR(milter->buf));
+		    continue;
+
+		    /*
+		     * Modification request: append recipient, with optional
+		     * ESMTP args.
+		     */
+		case SMFIR_ADDRCPT_PAR:
+		    if (milter8_read_data(milter, &data_size,
+					  MILTER8_DATA_STRING, milter->buf,
+					  MILTER8_DATA_MORE) != 0)
+			MILTER8_EVENT_BREAK(milter->def_reply);
+		    if (data_size > 0) {
+			if (milter8_read_data(milter, &data_size,
+					  MILTER8_DATA_STRING, milter->body,
+					      MILTER8_DATA_END) != 0)
+			    MILTER8_EVENT_BREAK(milter->def_reply);
+		    } else {
+			VSTRING_RESET(milter->body);
+			VSTRING_TERMINATE(milter->body);
+		    }
+		    /* Skip to the next request after previous edit error. */
+		    if (edit_resp)
+			continue;
+		    edit_resp = parent->add_rcpt_par(parent->chg_context,
+						     STR(milter->buf),
+						     STR(milter->body));
+		    continue;
+
+		    /*
+		     * Modification request: delete (expansion of) recipient.
+		     */
+		case SMFIR_DELRCPT:
+		    if (milter8_read_data(milter, &data_size,
+					  MILTER8_DATA_STRING, milter->buf,
+					  MILTER8_DATA_END) != 0)
+			MILTER8_EVENT_BREAK(milter->def_reply);
+		    /* Skip to the next request after previous edit error. */
+		    if (edit_resp)
+			continue;
+		    edit_resp = parent->del_rcpt(parent->chg_context,
+						 STR(milter->buf));
+		    continue;
+
+		    /*
+		     * Modification request: replace the message body, and
+		     * update the message size.
+		     */
+		case SMFIR_REPLBODY:
+		    if (body_edit_lockout) {
+			msg_warn("milter %s: body replacement requests can't "
+				 "currently be mixed with other requests",
+				 milter->m.name);
+			milter8_conf_error(milter);
+			MILTER8_EVENT_BREAK(milter->def_reply);
+		    }
+		    if (milter8_read_data(milter, &data_size,
+					  MILTER8_DATA_BUFFER, milter->body,
+					  MILTER8_DATA_END) != 0)
+			MILTER8_EVENT_BREAK(milter->def_reply);
+		    /* Skip to the next request after previous edit error. */
+		    if (edit_resp)
+			continue;
+		    /* Start body replacement. */
+		    if (body_line_buf == 0) {
+			body_line_buf = vstring_alloc(var_line_limit);
+			edit_resp = parent->repl_body(parent->chg_context,
+						      MILTER_BODY_START,
+						      /* unused */ 0,
+						      (VSTRING *) 0);
+		    }
+		    /* Extract lines from the on-the-wire CRLF format. */
+		    for (cp = STR(milter->body); edit_resp == 0
+			 && cp < vstring_end(milter->body); cp++) {
+			ch = *(unsigned char *) cp;
+			if (ch == '\n') {
+			    if (LEN(body_line_buf) > 0
+				&& vstring_end(body_line_buf)[-1] == '\r')
+				vstring_truncate(body_line_buf,
+						 LEN(body_line_buf) - 1);
+			    edit_resp = parent->repl_body(parent->chg_context,
+							  MILTER_BODY_LINE,
+							  REC_TYPE_NORM,
+							  body_line_buf);
+			    VSTRING_RESET(body_line_buf);
+			} else {
+			    /* Preserves \r if not followed by \n. */
+			    if (LEN(body_line_buf) == var_line_limit) {
+				edit_resp = parent->repl_body(parent->chg_context,
+							   MILTER_BODY_LINE,
+							      REC_TYPE_CONT,
+							      body_line_buf);
+				VSTRING_RESET(body_line_buf);
+			    }
+			    VSTRING_ADDCH(body_line_buf, ch);
+			}
+		    }
+		    continue;
+		}
+	    }
+	    msg_warn("milter %s: unexpected filter response %s after event %s",
+		     milter->m.name,
+		     (smfir_name = str_name_code(smfir_table, cmd)) != 0 ?
+		     smfir_name : "(unknown filter reply)",
+		     (smfic_name = str_name_code(smfic_table, event)) != 0 ?
+		     smfic_name : "(unknown MTA event)");
+	    milter8_comm_error(milter);
+	    MILTER8_EVENT_BREAK(milter->def_reply);
+	}
+
+	/*
+	 * Get here when the reply was followed by data bytes that weren't
+	 * supposed to be there.
+	 */
+	msg_warn("milter %s: reply %s was followed by %ld data bytes",
+	milter->m.name, (smfir_name = str_name_code(smfir_table, cmd)) != 0 ?
+		 smfir_name : "unknown", (long) data_len);
+	milter8_comm_error(milter);
+	MILTER8_EVENT_BREAK(milter->def_reply);
+    }
+
+    /*
+     * Clean up after aborted message body replacement.
+     */
+    if (body_line_buf)
+	vstring_free(body_line_buf);
+
+    /*
+     * XXX Some cleanup clients ask the cleanup server to bounce mail for
+     * them. In that case we must override a hard reject retval result after
+     * queue file update failure. This is not a big problem; the odds are
+     * small that a Milter application sends a hard reject after replacing
+     * the message body.
+     */
+    if (edit_resp && (retval == 0 || strchr("DS4", retval[0]) == 0))
+	retval = edit_resp;
+    return (retval);
+}
+
+/* milter8_connect - connect to filter */
+
+static void milter8_connect(MILTER8 *milter)
+{
+    const char *myname = "milter8_connect";
+    ssize_t data_len;
+    unsigned char cmd;
+    char   *transport;
+    char   *endpoint;
+    int     (*connect_fn) (const char *, int, int);
+    int     fd;
+    const UINT32_TYPE my_actions = (SMFIF_ADDHDRS | SMFIF_ADDRCPT
+				    | SMFIF_DELRCPT | SMFIF_CHGHDRS
+				    | SMFIF_CHGBODY
+				    | SMFIF_QUARANTINE
+				    | SMFIF_CHGFROM
+				    | SMFIF_ADDRCPT_PAR
+				    | SMFIF_SETSYMLIST
+    );
+    UINT32_TYPE my_version = 0;
+    UINT32_TYPE my_events = 0;
+    char   *saved_version;
+    char   *cp;
+    char   *name;
+
+    /*
+     * Sanity check.
+     */
+    if (milter->fp != 0)
+	msg_panic("%s: milter %s: socket is not closed",
+		  myname, milter->m.name);
+
+    /*
+     * For user friendliness reasons the milter_protocol configuration
+     * parameter can specify both the protocol version and protocol
+     * extensions (e.g., don't reply for each individual message header).
+     * 
+     * The protocol version is sent as is to the milter application.
+     * 
+     * The version and extensions determine what events we can send to the
+     * milter application.
+     * 
+     * We don't announce support for events that aren't defined for my protocol
+     * version. Today's libmilter implementations don't seem to care, but we
+     * don't want to take the risk that a future version will be more picky.
+     */
+    cp = saved_version = mystrdup(milter->protocol);
+    while ((name = mystrtok(&cp, CHARS_COMMA_SP)) != 0) {
+	int     mask;
+	int     vers;
+
+	if ((mask = name_code(milter8_event_masks,
+			      NAME_CODE_FLAG_NONE, name)) == -1
+	    || (vers = name_code(milter8_versions,
+				 NAME_CODE_FLAG_NONE, name)) == -1
+	    || (vers != 0 && my_version != 0)) {
+	    msg_warn("milter %s: bad protocol information: %s",
+		     milter->m.name, name);
+	    milter8_conf_error(milter);
+	    return;
+	}
+	if (vers != 0)
+	    my_version = vers;
+	my_events |= mask;
+    }
+    myfree(saved_version);
+    if (my_events == 0 || my_version == 0) {
+	msg_warn("milter %s: no protocol version information", milter->m.name);
+	milter8_conf_error(milter);
+	return;
+    }
+
+    /*
+     * Don't send events that aren't defined for my protocol version.
+     */
+    milter->np_mask = (SMFIP_NOSEND_MASK & ~my_events);
+    if (msg_verbose)
+	msg_info("%s: non-protocol events for protocol version %d: %s",
+		 myname, my_version,
+		 str_name_mask_opt(milter->buf, "non-protocol event mask",
+			   smfip_table, milter->np_mask, NAME_MASK_NUMBER));
+
+    /*
+     * Parse the Milter application endpoint.
+     */
+#define FREE_TRANSPORT_AND_BAIL_OUT(milter, milter_error) do { \
+	myfree(transport); \
+	milter_error(milter); \
+	return; \
+    } while (0);
+
+    transport = mystrdup(milter->m.name);
+    if ((endpoint = split_at(transport, ':')) == 0
+	|| *endpoint == 0 || *transport == 0) {
+	msg_warn("Milter service needs transport:endpoint instead of \"%s\"",
+		 milter->m.name);
+	FREE_TRANSPORT_AND_BAIL_OUT(milter, milter8_conf_error);
+    }
+    if (msg_verbose)
+	msg_info("%s: transport=%s endpoint=%s", myname, transport, endpoint);
+    if (strcmp(transport, "inet") == 0) {
+	connect_fn = inet_connect;
+    } else if (strcmp(transport, "unix") == 0) {
+	connect_fn = unix_connect;
+    } else if (strcmp(transport, "local") == 0) {
+	connect_fn = LOCAL_CONNECT;
+    } else {
+	msg_warn("invalid transport name: %s in Milter service: %s",
+		 transport, milter->m.name);
+	FREE_TRANSPORT_AND_BAIL_OUT(milter, milter8_conf_error);
+    }
+
+    /*
+     * Connect to the Milter application.
+     */
+    if ((fd = connect_fn(endpoint, BLOCKING, milter->conn_timeout)) < 0) {
+	msg_warn("connect to Milter service %s: %m", milter->m.name);
+	FREE_TRANSPORT_AND_BAIL_OUT(milter, milter8_comm_error);
+    }
+    myfree(transport);
+    milter->fp = vstream_fdopen(fd, O_RDWR);
+    vstream_control(milter->fp,
+		    CA_VSTREAM_CTL_DOUBLE,
+		    CA_VSTREAM_CTL_TIMEOUT(milter->cmd_timeout),
+		    CA_VSTREAM_CTL_END);
+    /* Avoid poor performance when TCP MSS > VSTREAM_BUFSIZE. */
+    if (connect_fn == inet_connect)
+	vstream_tweak_tcp(milter->fp);
+
+    /*
+     * Open the negotiations by sending what actions the Milter may request
+     * and what events the Milter can receive.
+     */
+    if (msg_verbose) {
+	msg_info("%s: my_version=0x%lx", myname, (long) my_version);
+	msg_info("%s: my_actions=0x%lx %s", myname, (long) my_actions,
+		 str_name_mask_opt(milter->buf, "request mask",
+				smfif_table, my_actions, NAME_MASK_NUMBER));
+	msg_info("%s: my_events=0x%lx %s", myname, (long) my_events,
+		 str_name_mask_opt(milter->buf, "event mask",
+				 smfip_table, my_events, NAME_MASK_NUMBER));
+    }
+    errno = 0;
+    if (milter8_write_cmd(milter, SMFIC_OPTNEG,
+			  MILTER8_DATA_HLONG, my_version,
+			  MILTER8_DATA_HLONG, my_actions,
+			  MILTER8_DATA_HLONG, my_events,
+			  MILTER8_DATA_END) != 0) {
+	msg_warn("milter %s: write error in initial handshake",
+		 milter->m.name);
+	/* milter8_write_cmd() called milter8_comm_error() */
+	return;
+    }
+
+    /*
+     * Receive the filter's response and verify that we are compatible.
+     */
+    if (milter8_read_resp(milter, SMFIC_OPTNEG, &cmd, &data_len) != 0) {
+	msg_warn("milter %s: read error in initial handshake", milter->m.name);
+	/* milter8_read_resp() called milter8_comm_error() */
+	return;
+    }
+    if (cmd != SMFIC_OPTNEG) {
+	msg_warn("milter %s: unexpected reply \"%c\" in initial handshake",
+		 milter->m.name, cmd);
+	(void) milter8_comm_error(milter);
+	return;
+    }
+    if (milter8_read_data(milter, &data_len,
+			  MILTER8_DATA_HLONG, &milter->version,
+			  MILTER8_DATA_HLONG, &milter->rq_mask,
+			  MILTER8_DATA_HLONG, &milter->ev_mask,
+			  MILTER8_DATA_MORE) != 0) {
+	msg_warn("milter %s: read error in initial handshake", milter->m.name);
+	/* milter8_read_data() called milter8_comm_error() */
+	return;
+    }
+    if (milter->version > my_version) {
+	msg_warn("milter %s: protocol version %d conflict"
+		 " with MTA protocol version %d",
+		 milter->m.name, milter->version, my_version);
+	(void) milter8_comm_error(milter);
+	return;
+    }
+    if ((milter->rq_mask & my_actions) != milter->rq_mask) {
+	msg_warn("milter %s: request mask 0x%x conflict"
+		 " with MTA request mask 0x%lx",
+		 milter->m.name, milter->rq_mask, (long) my_actions);
+	(void) milter8_comm_error(milter);
+	return;
+    }
+    if (milter->ev_mask & SMFIP_RCPT_REJ)
+	milter->m.flags |= MILTER_FLAG_WANT_RCPT_REJ;
+
+    /*
+     * Allow the remote application to run an older protocol version, but
+     * don't them send events that their protocol version doesn't support.
+     * Based on a suggestion by Kouhei Sutou.
+     * 
+     * XXX When the Milter sends a protocol version that we don't have
+     * information for, use the information for the next-lower protocol
+     * version instead. This code assumes that the milter8_event_masks table
+     * is organized in reverse numerical order.
+     */
+    if (milter->version < my_version) {
+	const NAME_CODE *np;
+	int     version;
+
+	for (np = milter8_event_masks; /* see below */ ; np++) {
+	    if (np->name == 0) {
+		msg_warn("milter %s: unexpected protocol version %d",
+			 milter->m.name, milter->version);
+		break;
+	    }
+	    if ((version = atoi(np->name)) > 0 && version <= milter->version) {
+		milter->np_mask |= (SMFIP_NOSEND_MASK & ~np->code);
+		if (msg_verbose)
+		    msg_info("%s: non-protocol events for milter %s"
+			     " protocol version %d: %s",
+			     myname, milter->m.name, milter->version,
+			     str_name_mask_opt(milter->buf,
+					       "non-protocol event mask",
+					       smfip_table, milter->np_mask,
+					       NAME_MASK_NUMBER));
+		break;
+	    }
+	}
+    }
+
+    /*
+     * Initial negotiations completed.
+     */
+    if (msg_verbose) {
+	if ((milter->ev_mask & my_events) != milter->ev_mask)
+	    msg_info("milter %s: event mask 0x%x includes features not"
+		     " offered in MTA event mask 0x%lx",
+		     milter->m.name, milter->ev_mask, (long) my_events);
+	msg_info("%s: milter %s version %d",
+		 myname, milter->m.name, milter->version);
+	msg_info("%s: events %s", myname,
+		 str_name_mask_opt(milter->buf, "event mask",
+			   smfip_table, milter->ev_mask, NAME_MASK_NUMBER));
+	msg_info("%s: requests %s", myname,
+		 str_name_mask_opt(milter->buf, "request mask",
+			   smfif_table, milter->rq_mask, NAME_MASK_NUMBER));
+    }
+    milter->state = MILTER8_STAT_READY;
+    milter8_def_reply(milter, 0);
+    milter->skip_event_type = 0;
+
+    /*
+     * Secondary negotiations: override lists of macro names.
+     */
+    if (data_len > 0) {
+	VSTRING *buf = vstring_alloc(100);
+	UINT32_TYPE mac_type;
+	const char *smfim_name;
+	char  **mac_value_ptr;
+
+	milter->m.macros = milter_macros_alloc(MILTER_MACROS_ALLOC_EMPTY);
+
+	while (data_len > 0
+	       && milter8_read_data(milter, &data_len,
+				    MILTER8_DATA_HLONG, &mac_type,
+				    MILTER8_DATA_STRING, buf,
+				    MILTER8_DATA_MORE) == 0) {
+	    smfim_name = str_name_code(smfim_table, mac_type);
+	    if (smfim_name == 0) {
+		msg_warn("milter %s: ignoring unknown macro type %u",
+			 milter->m.name, (unsigned) mac_type);
+	    } else {
+		if (msg_verbose)
+		    msg_info("override %s macro list with \"%s\"",
+			     smfim_name, STR(buf));
+		mac_value_ptr = MILTER8_MACRO_PTR(milter->m.macros, mac_type);
+		myfree(*mac_value_ptr);
+		*mac_value_ptr = mystrdup(STR(buf));
+	    }
+	}
+	/* milter8_read_data() calls milter8_comm_error() after error. */
+	vstring_free(buf);
+	/* At this point the filter state is either READY or ERROR. */
+    }
+}
+
+/* milter8_conn_event - report connect event to Sendmail 8 milter */
+
+static const char *milter8_conn_event(MILTER *m,
+				              const char *client_name,
+				              const char *client_addr,
+				              const char *client_port,
+				              unsigned addr_family,
+				              ARGV *macros)
+{
+    const char *myname = "milter8_conn_event";
+    MILTER8 *milter = (MILTER8 *) m;
+    int     port;
+    int     skip_reply;
+    const char *sm_name;
+    char   *ptr = 0;
+    const char *resp;
+
+    /*
+     * Need a global definition for "unknown" host name or address that is
+     * shared by smtpd, cleanup and libmilter.
+     */
+#define XXX_UNKNOWN	"unknown"
+#define STR_EQ(x,y)	(strcmp((x), (y)) == 0)
+#define STR_NE(x,y)	(strcmp((x), (y)) != 0)
+
+    /*
+     * Report the event.
+     */
+    switch (milter->state) {
+    case MILTER8_STAT_ERROR:
+	if (msg_verbose)
+	    msg_info("%s: skip milter %s", myname, milter->m.name);
+	return (milter->def_reply);
+    case MILTER8_STAT_READY:
+	if (msg_verbose)
+	    msg_info("%s: milter %s: connect %s/%s",
+		     myname, milter->m.name, client_name, client_addr);
+	if (client_port == 0) {
+	    port = 0;
+	} else if (!alldig(client_port) || (port = atoi(client_port)) < 0
+		   || port > 65535) {
+	    msg_warn("milter %s: bad client port number %s",
+		     milter->m.name, client_port);
+	    port = 0;
+	}
+	milter->state = MILTER8_STAT_ENVELOPE;
+	skip_reply = ((milter->ev_mask & SMFIP_NR_CONN) != 0);
+	/* Transform unknown hostname from Postfix to Sendmail form. */
+	sm_name = (STR_NE(client_name, XXX_UNKNOWN) ? client_name :
+		   STR_EQ(client_addr, XXX_UNKNOWN) ? client_name :
+		   (ptr = concatenate("[", client_addr, "]", (char *) 0)));
+	switch (addr_family) {
+	case AF_INET:
+	    resp = milter8_event(milter, SMFIC_CONNECT, SMFIP_NOCONNECT,
+				 skip_reply, macros,
+				 MILTER8_DATA_STRING, sm_name,
+				 MILTER8_DATA_OCTET, SMFIA_INET,
+				 MILTER8_DATA_NSHORT, htons(port),
+				 MILTER8_DATA_STRING, client_addr,
+				 MILTER8_DATA_END);
+	    break;
+#ifdef HAS_IPV6
+	case AF_INET6:
+	    resp = milter8_event(milter, SMFIC_CONNECT, SMFIP_NOCONNECT,
+				 skip_reply, macros,
+				 MILTER8_DATA_STRING, sm_name,
+				 MILTER8_DATA_OCTET, SMFIA_INET6,
+				 MILTER8_DATA_NSHORT, htons(port),
+				 MILTER8_DATA_STRING, client_addr,
+				 MILTER8_DATA_END);
+	    break;
+#endif
+	case AF_UNIX:
+	    resp = milter8_event(milter, SMFIC_CONNECT, SMFIP_NOCONNECT,
+				 skip_reply, macros,
+				 MILTER8_DATA_STRING, sm_name,
+				 MILTER8_DATA_OCTET, SMFIA_UNIX,
+				 MILTER8_DATA_NSHORT, htons(0),
+				 MILTER8_DATA_STRING, client_addr,
+				 MILTER8_DATA_END);
+	    break;
+	default:
+	    resp = milter8_event(milter, SMFIC_CONNECT, SMFIP_NOCONNECT,
+				 skip_reply, macros,
+				 MILTER8_DATA_STRING, sm_name,
+				 MILTER8_DATA_OCTET, SMFIA_UNKNOWN,
+				 MILTER8_DATA_END);
+	    break;
+	}
+	if (ptr != 0)
+	    myfree(ptr);
+	return (resp);
+    default:
+	msg_panic("%s: milter %s: bad state %d",
+		  myname, milter->m.name, milter->state);
+    }
+}
+
+/* milter8_helo_event - report HELO/EHLO command to Sendmail 8 milter */
+
+static const char *milter8_helo_event(MILTER *m, const char *helo_name,
+				              int unused_esmtp,
+				              ARGV *macros)
+{
+    const char *myname = "milter8_helo_event";
+    MILTER8 *milter = (MILTER8 *) m;
+    int     skip_reply;
+
+    /*
+     * Report the event.
+     */
+    switch (milter->state) {
+    case MILTER8_STAT_ERROR:
+    case MILTER8_STAT_ACCEPT_CON:
+    case MILTER8_STAT_REJECT_CON:
+	if (msg_verbose)
+	    msg_info("%s: skip milter %s", myname, milter->m.name);
+	return (milter->def_reply);
+    case MILTER8_STAT_ENVELOPE:
+    case MILTER8_STAT_ACCEPT_MSG:
+	/* With HELO after MAIL, smtpd(8) calls milter8_abort() next. */
+	if (msg_verbose)
+	    msg_info("%s: milter %s: helo %s",
+		     myname, milter->m.name, helo_name);
+	skip_reply = ((milter->ev_mask & SMFIP_NR_HELO) != 0);
+	return (milter8_event(milter, SMFIC_HELO, SMFIP_NOHELO,
+			      skip_reply, macros,
+			      MILTER8_DATA_STRING, helo_name,
+			      MILTER8_DATA_END));
+    default:
+	msg_panic("%s: milter %s: bad state %d",
+		  myname, milter->m.name, milter->state);
+    }
+}
+
+/* milter8_mail_event - report MAIL command to Sendmail 8 milter */
+
+static const char *milter8_mail_event(MILTER *m, const char **argv,
+				              ARGV *macros)
+{
+    const char *myname = "milter8_mail_event";
+    MILTER8 *milter = (MILTER8 *) m;
+    const char **cpp;
+    int     skip_reply;
+
+    /*
+     * Report the event.
+     */
+    switch (milter->state) {
+    case MILTER8_STAT_ERROR:
+    case MILTER8_STAT_ACCEPT_CON:
+    case MILTER8_STAT_REJECT_CON:
+	if (msg_verbose)
+	    msg_info("%s: skip milter %s", myname, milter->m.name);
+	return (milter->def_reply);
+    case MILTER8_STAT_ENVELOPE:
+	if (msg_verbose) {
+	    VSTRING *buf = vstring_alloc(100);
+
+	    for (cpp = argv; *cpp; cpp++)
+		vstring_sprintf_append(buf, " %s", *cpp);
+	    msg_info("%s: milter %s: mail%s",
+		     myname, milter->m.name, STR(buf));
+	    vstring_free(buf);
+	}
+	skip_reply = ((milter->ev_mask & SMFIP_NR_MAIL) != 0);
+	return (milter8_event(milter, SMFIC_MAIL, SMFIP_NOMAIL,
+			      skip_reply, macros,
+			      MILTER8_DATA_ARGV, argv,
+			      MILTER8_DATA_END));
+    default:
+	msg_panic("%s: milter %s: bad state %d",
+		  myname, milter->m.name, milter->state);
+    }
+}
+
+/* milter8_rcpt_event - report RCPT command to Sendmail 8 milter */
+
+static const char *milter8_rcpt_event(MILTER *m, const char **argv,
+				              ARGV *macros)
+{
+    const char *myname = "milter8_rcpt_event";
+    MILTER8 *milter = (MILTER8 *) m;
+    const char **cpp;
+    int     skip_reply;
+
+    /*
+     * Report the event.
+     */
+    switch (milter->state) {
+    case MILTER8_STAT_ERROR:
+    case MILTER8_STAT_ACCEPT_CON:
+    case MILTER8_STAT_REJECT_CON:
+    case MILTER8_STAT_ACCEPT_MSG:
+	if (msg_verbose)
+	    msg_info("%s: skip milter %s", myname, milter->m.name);
+	return (milter->def_reply);
+    case MILTER8_STAT_ENVELOPE:
+	if (msg_verbose) {
+	    VSTRING *buf = vstring_alloc(100);
+
+	    for (cpp = argv; *cpp; cpp++)
+		vstring_sprintf_append(buf, " %s", *cpp);
+	    msg_info("%s: milter %s: rcpt%s",
+		     myname, milter->m.name, STR(buf));
+	    vstring_free(buf);
+	}
+	skip_reply = ((milter->ev_mask & SMFIP_NR_RCPT) != 0);
+	return (milter8_event(milter, SMFIC_RCPT, SMFIP_NORCPT,
+			      skip_reply, macros,
+			      MILTER8_DATA_ARGV, argv,
+			      MILTER8_DATA_END));
+    default:
+	msg_panic("%s: milter %s: bad state %d",
+		  myname, milter->m.name, milter->state);
+    }
+}
+
+/* milter8_data_event - report DATA command to Sendmail 8 milter */
+
+static const char *milter8_data_event(MILTER *m, ARGV *macros)
+{
+    const char *myname = "milter8_data_event";
+    MILTER8 *milter = (MILTER8 *) m;
+    int     skip_reply;
+
+    /*
+     * Report the event.
+     */
+    switch (milter->state) {
+    case MILTER8_STAT_ERROR:
+    case MILTER8_STAT_ACCEPT_CON:
+    case MILTER8_STAT_REJECT_CON:
+    case MILTER8_STAT_ACCEPT_MSG:
+	if (msg_verbose)
+	    msg_info("%s: skip milter %s", myname, milter->m.name);
+	return (milter->def_reply);
+    case MILTER8_STAT_ENVELOPE:
+	if (msg_verbose)
+	    msg_info("%s: milter %s: data command", myname, milter->m.name);
+	skip_reply = ((milter->ev_mask & SMFIP_NR_DATA) != 0);
+	return (milter8_event(milter, SMFIC_DATA, SMFIP_NODATA,
+			      skip_reply, macros,
+			      MILTER8_DATA_END));
+    default:
+	msg_panic("%s: milter %s: bad state %d",
+		  myname, milter->m.name, milter->state);
+    }
+}
+
+/* milter8_unknown_event - report unknown SMTP command to Sendmail 8 milter */
+
+static const char *milter8_unknown_event(MILTER *m, const char *command,
+					         ARGV *macros)
+{
+    const char *myname = "milter8_unknown_event";
+    MILTER8 *milter = (MILTER8 *) m;
+    int     skip_reply;
+
+    /*
+     * Report the event.
+     */
+    switch (milter->state) {
+    case MILTER8_STAT_ERROR:
+    case MILTER8_STAT_ACCEPT_CON:
+    case MILTER8_STAT_REJECT_CON:
+    case MILTER8_STAT_ACCEPT_MSG:
+	if (msg_verbose)
+	    msg_info("%s: skip milter %s", myname, milter->m.name);
+	return (milter->def_reply);
+    case MILTER8_STAT_ENVELOPE:
+	if (msg_verbose)
+	    msg_info("%s: milter %s: unknown command: %s",
+		     myname, milter->m.name, command);
+	/* XXX Sendmail doesn't send macros (checked with 8.6.13). */
+	skip_reply = ((milter->ev_mask & SMFIP_NR_UNKN) != 0);
+	return (milter8_event(milter, SMFIC_UNKNOWN, SMFIP_NOUNKNOWN,
+			      skip_reply, macros,
+			      MILTER8_DATA_STRING, command,
+			      MILTER8_DATA_END));
+    default:
+	msg_panic("%s: milter %s: bad state %d",
+		  myname, milter->m.name, milter->state);
+    }
+}
+
+/* milter8_other_event - reply for other event */
+
+static const char *milter8_other_event(MILTER *m)
+{
+    const char *myname = "milter8_other_event";
+    MILTER8 *milter = (MILTER8 *) m;
+
+    /*
+     * Return the default reply.
+     */
+    if (msg_verbose)
+	msg_info("%s: milter %s", myname, milter->m.name);
+    return (milter->def_reply);
+}
+
+/* milter8_abort - cancel one milter's message receiving state */
+
+static void milter8_abort(MILTER *m)
+{
+    const char *myname = "milter8_abort";
+    MILTER8 *milter = (MILTER8 *) m;
+
+    /*
+     * XXX Sendmail 8 libmilter closes the MTA-to-filter socket when it finds
+     * out that the SMTP client has disconnected. Because of this, Postfix
+     * has to open a new MTA-to-filter socket for each SMTP client.
+     */
+    switch (milter->state) {
+    case MILTER8_STAT_CLOSED:
+    case MILTER8_STAT_READY:
+	return;
+    case MILTER8_STAT_ERROR:
+    case MILTER8_STAT_ACCEPT_CON:
+    case MILTER8_STAT_REJECT_CON:
+	if (msg_verbose)
+	    msg_info("%s: skip milter %s", myname, milter->m.name);
+	break;
+    case MILTER8_STAT_ENVELOPE:
+    case MILTER8_STAT_MESSAGE:
+    case MILTER8_STAT_ACCEPT_MSG:
+	if (msg_verbose)
+	    msg_info("%s: abort milter %s", myname, milter->m.name);
+	(void) milter8_write_cmd(milter, SMFIC_ABORT, MILTER8_DATA_END);
+	if (milter->state != MILTER8_STAT_ERROR)
+	    milter->state = MILTER8_STAT_ENVELOPE;
+	break;
+    default:
+	msg_panic("%s: milter %s: bad state %d",
+		  myname, milter->m.name, milter->state);
+    }
+}
+
+/* milter8_disc_event - report client disconnect event */
+
+static void milter8_disc_event(MILTER *m)
+{
+    const char *myname = "milter8_disc_event";
+    MILTER8 *milter = (MILTER8 *) m;
+
+    /*
+     * XXX Sendmail 8 libmilter closes the MTA-to-filter socket when it finds
+     * out that the SMTP client has disconnected. Because of this, Postfix
+     * has to open a new MTA-to-filter socket for each SMTP client.
+     */
+    switch (milter->state) {
+    case MILTER8_STAT_CLOSED:
+    case MILTER8_STAT_READY:
+	return;
+    case MILTER8_STAT_ERROR:
+#ifdef LIBMILTER_AUTO_DISCONNECT
+    case MILTER8_STAT_ACCEPT_CON:
+    case MILTER8_STAT_REJECT_CON:
+#endif
+	if (msg_verbose)
+	    msg_info("%s: skip quit milter %s", myname, milter->m.name);
+	break;
+    case MILTER8_STAT_ENVELOPE:
+    case MILTER8_STAT_MESSAGE:
+#ifndef LIBMILTER_AUTO_DISCONNECT
+    case MILTER8_STAT_ACCEPT_CON:
+    case MILTER8_STAT_REJECT_CON:
+#endif
+    case MILTER8_STAT_ACCEPT_MSG:
+	if (msg_verbose)
+	    msg_info("%s: quit milter %s", myname, milter->m.name);
+	(void) milter8_write_cmd(milter, SMFIC_QUIT, MILTER8_DATA_END);
+	break;
+    }
+#ifdef LIBMILTER_AUTO_DISCONNECT
+    milter8_close_stream(milter);
+#else
+    if (milter->state != MILTER8_STAT_ERROR)
+	milter->state = MILTER8_STAT_READY;
+#endif
+    milter8_def_reply(milter, 0);
+}
+
+ /*
+  * Structure to ship context across the MIME_STATE engine.
+  */
+typedef struct {
+    MILTER8 *milter;			/* milter client */
+    ARGV   *eoh_macros;			/* end-of-header macros */
+    ARGV   *eod_macros;			/* end-of-body macros */
+    ARGV   *auto_hdrs;			/* auto-generated headers */
+    int     auto_done;			/* good enough for now */
+    int     first_header;		/* first header */
+    int     first_body;			/* first body line */
+    const char *resp;			/* milter application response */
+} MILTER_MSG_CONTEXT;
+
+/* milter8_header - milter8_message call-back for message header */
+
+static void milter8_header(void *ptr, int unused_header_class,
+			           const HEADER_OPTS *header_info,
+			           VSTRING *buf, off_t unused_offset)
+{
+    const char *myname = "milter8_header";
+    MILTER_MSG_CONTEXT *msg_ctx = (MILTER_MSG_CONTEXT *) ptr;
+    MILTER8 *milter = msg_ctx->milter;
+    char   *cp;
+    int     skip_reply;
+    char  **cpp;
+    unsigned done;
+
+    /*
+     * XXX Workaround: mime_state_update() may invoke multiple call-backs
+     * before returning to the caller.
+     */
+#define MILTER8_MESSAGE_DONE(milter, msg_ctx) \
+	((milter)->state != MILTER8_STAT_MESSAGE || (msg_ctx)->resp != 0)
+
+    if (MILTER8_MESSAGE_DONE(milter, msg_ctx))
+	return;
+
+    /*
+     * XXX Sendmail compatibility. Don't expose our first (received) header
+     * to mail filter applications. See also cleanup_milter.c for code to
+     * ensure that header replace requests are relative to the message
+     * content as received, that is, without our own first (received) header,
+     * while header insert requests are relative to the message as delivered,
+     * that is, including our own first (received) header.
+     * 
+     * XXX But this breaks when they delete our own Received: header with
+     * header_checks before it reaches the queue file. Even then we must not
+     * expose the first header to mail filter applications, otherwise the
+     * dk-filter signature will be inserted at the wrong position. It should
+     * precede the headers that it signs.
+     * 
+     * XXX Sendmail compatibility. It eats the first space (not tab) after the
+     * header label and ":".
+     */
+    for (cpp = msg_ctx->auto_hdrs->argv, done = 1; *cpp; cpp++, done <<= 1)
+	if ((msg_ctx->auto_done & done) == 0 && strcmp(*cpp, STR(buf)) == 0) {
+	    msg_ctx->auto_done |= done;
+	    return;
+	}
+
+    /*
+     * Sendmail 8 sends multi-line headers as text separated by newline.
+     * 
+     * We destroy the header buffer to split it into label and value. Changing
+     * the buffer is explicitly allowed by the mime_state(3) interface.
+     */
+    if (msg_verbose > 1)
+	msg_info("%s: header milter %s: %.100s",
+		 myname, milter->m.name, STR(buf));
+    cp = STR(buf) + (header_info ? strlen(header_info->name) :
+		     is_header(STR(buf)));
+    /* XXX Following matches is_header.c */
+    while (*cp == ' ' || *cp == '\t')
+	*cp++ = 0;
+    if (*cp != ':')
+	msg_panic("%s: header label not followed by ':'", myname);
+    *cp++ = 0;
+    /* XXX Sendmail by default eats one space (not tab) after the colon. */
+    if ((milter->ev_mask & SMFIP_HDR_LEADSPC) == 0 && *cp == ' ')
+	cp++;
+    skip_reply = ((milter->ev_mask & SMFIP_NOHREPL) != 0);
+    msg_ctx->resp =
+	milter8_event(milter, SMFIC_HEADER, SMFIP_NOHDRS,
+		      skip_reply, msg_ctx->eoh_macros,
+		      MILTER8_DATA_STRING, STR(buf),
+		      MILTER8_DATA_STRING, cp,
+		      MILTER8_DATA_END);
+}
+
+/* milter8_eoh - milter8_message call-back for end-of-header */
+
+static void milter8_eoh(void *ptr)
+{
+    const char *myname = "milter8_eoh";
+    MILTER_MSG_CONTEXT *msg_ctx = (MILTER_MSG_CONTEXT *) ptr;
+    MILTER8 *milter = msg_ctx->milter;
+    int     skip_reply;
+
+    if (MILTER8_MESSAGE_DONE(milter, msg_ctx))
+	return;
+    if (msg_verbose)
+	msg_info("%s: eoh milter %s", myname, milter->m.name);
+    skip_reply = ((milter->ev_mask & SMFIP_NR_EOH) != 0);
+    msg_ctx->resp =
+	milter8_event(milter, SMFIC_EOH, SMFIP_NOEOH,
+		      skip_reply, msg_ctx->eoh_macros,
+		      MILTER8_DATA_END);
+}
+
+/* milter8_body - milter8_message call-back for body content */
+
+static void milter8_body(void *ptr, int rec_type,
+			         const char *buf, ssize_t len,
+			         off_t offset)
+{
+    const char *myname = "milter8_body";
+    MILTER_MSG_CONTEXT *msg_ctx = (MILTER_MSG_CONTEXT *) ptr;
+    MILTER8 *milter = msg_ctx->milter;
+    ssize_t todo = len;
+    const char *bp = buf;
+    ssize_t space;
+    ssize_t count;
+    int     skip_reply;
+
+    if (MILTER8_MESSAGE_DONE(milter, msg_ctx))
+	return;
+
+    /*
+     * XXX Sendmail compatibility: don't expose our first body line.
+     */
+    if (msg_ctx->first_body) {
+	msg_ctx->first_body = 0;
+	return;
+    }
+
+    /*
+     * XXX I thought I was going to delegate all the on-the-wire formatting
+     * to a common lower layer, but unfortunately it's not practical. If we
+     * were to do MILTER_CHUNK_SIZE buffering in a common lower layer, then
+     * we would have to pass along call-backs and state, so that the
+     * call-back can invoke milter8_event() with the right arguments when the
+     * MILTER_CHUNK_SIZE buffer reaches capacity. That's just too ugly.
+     * 
+     * To recover the cost of making an extra copy of body content from Milter
+     * buffer to VSTREAM buffer, we could make vstream_fwrite() a little
+     * smarter so that it does large transfers directly from the user buffer
+     * instead of copying the data one block at a time into a VSTREAM buffer.
+     */
+    if (msg_verbose > 1)
+	msg_info("%s: body milter %s: %.100s", myname, milter->m.name, buf);
+    skip_reply = ((milter->ev_mask & SMFIP_NR_BODY) != 0);
+    /* To append \r\n, simply redirect input to another buffer. */
+    if (rec_type == REC_TYPE_NORM && todo == 0) {
+	bp = "\r\n";
+	todo = 2;
+	rec_type = REC_TYPE_EOF;
+    }
+    while (todo > 0) {
+	/* Append one REC_TYPE_NORM or REC_TYPE_CONT to body chunk buffer. */
+	space = MILTER_CHUNK_SIZE - LEN(milter->body);
+	if (space <= 0)
+	    msg_panic("%s: bad buffer size: %ld",
+		      myname, (long) LEN(milter->body));
+	count = (todo > space ? space : todo);
+	vstring_memcat(milter->body, bp, count);
+	bp += count;
+	todo -= count;
+	/* Flush body chunk buffer when full. See also milter8_eob(). */
+	if (LEN(milter->body) == MILTER_CHUNK_SIZE) {
+	    msg_ctx->resp =
+		milter8_event(milter, SMFIC_BODY, SMFIP_NOBODY,
+			      skip_reply, msg_ctx->eod_macros,
+			      MILTER8_DATA_BUFFER, milter->body,
+			      MILTER8_DATA_END);
+	    if (MILTER8_MESSAGE_DONE(milter, msg_ctx))
+		break;
+	    VSTRING_RESET(milter->body);
+	}
+	/* To append \r\n, simply redirect input to another buffer. */
+	if (rec_type == REC_TYPE_NORM && todo == 0) {
+	    bp = "\r\n";
+	    todo = 2;
+	    rec_type = REC_TYPE_EOF;
+	}
+    }
+}
+
+/* milter8_eob - milter8_message call-back for end-of-body */
+
+static void milter8_eob(void *ptr)
+{
+    const char *myname = "milter8_eob";
+    MILTER_MSG_CONTEXT *msg_ctx = (MILTER_MSG_CONTEXT *) ptr;
+    MILTER8 *milter = msg_ctx->milter;
+    int     skip_reply;
+
+    if (MILTER8_MESSAGE_DONE(milter, msg_ctx))
+	return;
+    if (msg_verbose)
+	msg_info("%s: eob milter %s", myname, milter->m.name);
+
+    /*
+     * Flush partial body chunk buffer. See also milter8_body().
+     * 
+     * XXX Sendmail 8 libmilter accepts SMFIC_EOB+data, and delivers it to the
+     * application as two events: SMFIC_BODY+data followed by SMFIC_EOB. This
+     * breaks with the PMilter 0.95 protocol re-implementation, which
+     * delivers the SMFIC_EOB event and ignores the data. To avoid such
+     * compatibility problems we separate the events in the client. With
+     * this, we also prepare for a future where different event types can
+     * have different macro lists.
+     */
+    if (LEN(milter->body) > 0) {
+	skip_reply = ((milter->ev_mask & SMFIP_NR_BODY) != 0);
+	msg_ctx->resp =
+	    milter8_event(milter, SMFIC_BODY, SMFIP_NOBODY,
+			  skip_reply, msg_ctx->eod_macros,
+			  MILTER8_DATA_BUFFER, milter->body,
+			  MILTER8_DATA_END);
+	if (MILTER8_MESSAGE_DONE(milter, msg_ctx))
+	    return;
+    }
+    msg_ctx->resp =
+	milter8_event(msg_ctx->milter, SMFIC_BODYEOB, 0,
+		      DONT_SKIP_REPLY, msg_ctx->eod_macros,
+		      MILTER8_DATA_END);
+}
+
+/* milter8_message - send message content and receive reply */
+
+static const char *milter8_message(MILTER *m, VSTREAM *qfile,
+				           off_t data_offset,
+				           ARGV *eoh_macros,
+				           ARGV *eod_macros,
+				           ARGV *auto_hdrs)
+{
+    const char *myname = "milter8_message";
+    MILTER8 *milter = (MILTER8 *) m;
+    MIME_STATE *mime_state;
+    int     rec_type;
+    const MIME_STATE_DETAIL *detail;
+    int     mime_errs = 0;
+    MILTER_MSG_CONTEXT msg_ctx;
+    VSTRING *buf;
+    int     saved_errno;
+
+    switch (milter->state) {
+    case MILTER8_STAT_ERROR:
+    case MILTER8_STAT_ACCEPT_CON:
+    case MILTER8_STAT_REJECT_CON:
+    case MILTER8_STAT_ACCEPT_MSG:
+	if (msg_verbose)
+	    msg_info("%s: skip message to milter %s", myname, milter->m.name);
+	return (milter->def_reply);
+    case MILTER8_STAT_ENVELOPE:
+	if (msg_verbose)
+	    msg_info("%s: message to milter %s", myname, milter->m.name);
+	if (vstream_fseek(qfile, data_offset, SEEK_SET) < 0) {
+	    saved_errno = errno;
+	    msg_warn("%s: vstream_fseek %s: %m", myname, VSTREAM_PATH(qfile));
+	    /* XXX This should be available from cleanup_strerror.c. */
+	    return (saved_errno == EFBIG ?
+		    "552 5.3.4 Message file too big" :
+		    "451 4.3.0 Queue file write error");
+	}
+	msg_ctx.milter = milter;
+	msg_ctx.eoh_macros = eoh_macros;
+	msg_ctx.eod_macros = eod_macros;
+	msg_ctx.auto_hdrs = auto_hdrs;
+	msg_ctx.auto_done = 0;
+	msg_ctx.first_header = 1;
+	msg_ctx.first_body = 1;
+	msg_ctx.resp = 0;
+	mime_state =
+	    mime_state_alloc(MIME_OPT_DISABLE_MIME,
+			     (milter->ev_mask & SMFIP_NOHDRS) ?
+			     (MIME_STATE_HEAD_OUT) 0 : milter8_header,
+			     (milter->ev_mask & SMFIP_NOEOH) ?
+			     (MIME_STATE_ANY_END) 0 : milter8_eoh,
+			     (milter->ev_mask & SMFIP_NOBODY) ?
+			     (MIME_STATE_BODY_OUT) 0 : milter8_body,
+			     milter8_eob,
+			     (MIME_STATE_ERR_PRINT) 0,
+			     (void *) &msg_ctx);
+	buf = vstring_alloc(100);
+	milter->state = MILTER8_STAT_MESSAGE;
+	VSTRING_RESET(milter->body);
+	vstream_control(milter->fp,
+			CA_VSTREAM_CTL_DOUBLE,
+			CA_VSTREAM_CTL_TIMEOUT(milter->msg_timeout),
+			CA_VSTREAM_CTL_END);
+
+	/*
+	 * XXX When the message (not MIME body part) does not end in CRLF
+	 * (i.e. the last record was REC_TYPE_CONT), do we send a CRLF
+	 * terminator before triggering the end-of-body condition?
+	 */
+	for (;;) {
+	    if ((rec_type = rec_get(qfile, buf, 0)) < 0) {
+		msg_warn("%s: error reading %s: %m",
+			 myname, VSTREAM_PATH(qfile));
+		msg_ctx.resp = "450 4.3.0 Queue file write error";
+		break;
+	    }
+	    /* Invoke the appropriate call-back routine. */
+	    mime_errs = mime_state_update(mime_state, rec_type,
+					  STR(buf), LEN(buf));
+	    if (mime_errs) {
+		detail = mime_state_detail(mime_errs);
+		msg_warn("%s: MIME problem %s in %s",
+			 myname, detail->text, VSTREAM_PATH(qfile));
+		msg_ctx.resp = "450 4.3.0 Queue file write error";
+		break;
+	    }
+	    if (MILTER8_MESSAGE_DONE(milter, &msg_ctx))
+		break;
+	    if (rec_type != REC_TYPE_NORM && rec_type != REC_TYPE_CONT)
+		break;
+	}
+	mime_state_free(mime_state);
+	vstring_free(buf);
+	if (milter->fp)
+	    vstream_control(milter->fp,
+			    CA_VSTREAM_CTL_DOUBLE,
+			    CA_VSTREAM_CTL_TIMEOUT(milter->cmd_timeout),
+			    CA_VSTREAM_CTL_END);
+	if (milter->state == MILTER8_STAT_MESSAGE
+	    || milter->state == MILTER8_STAT_ACCEPT_MSG)
+	    milter->state = MILTER8_STAT_ENVELOPE;
+	return (msg_ctx.resp);
+    default:
+	msg_panic("%s: milter %s: bad state %d",
+		  myname, milter->m.name, milter->state);
+    }
+}
+
+ /*
+  * Preliminary protocol to send/receive milter instances. This needs to be
+  * extended with type information once we support multiple milter protocols.
+  */
+#define MAIL_ATTR_MILT_NAME	"milter_name"
+#define MAIL_ATTR_MILT_VERS	"milter_version"
+#define MAIL_ATTR_MILT_ACTS	"milter_actions"
+#define MAIL_ATTR_MILT_EVTS	"milter_events"
+#define MAIL_ATTR_MILT_NPTS	"milter_non_events"
+#define MAIL_ATTR_MILT_STAT	"milter_state"
+#define MAIL_ATTR_MILT_CONN	"milter_conn_timeout"
+#define MAIL_ATTR_MILT_CMD	"milter_cmd_timeout"
+#define MAIL_ATTR_MILT_MSG	"milter_msg_timeout"
+#define MAIL_ATTR_MILT_ACT	"milter_action"
+#define MAIL_ATTR_MILT_MAC	"milter_macro_list"
+
+/* milter8_active - report if this milter still wants events */
+
+static int milter8_active(MILTER *m)
+{
+    MILTER8 *milter = (MILTER8 *) m;
+
+    return (milter->fp != 0
+	    && (milter->state == MILTER8_STAT_ENVELOPE
+		|| milter->state == MILTER8_STAT_READY));
+}
+
+/* milter8_send - send milter instance */
+
+static int milter8_send(MILTER *m, VSTREAM *stream)
+{
+    const char *myname = "milter8_send";
+    MILTER8 *milter = (MILTER8 *) m;
+
+    if (msg_verbose)
+	msg_info("%s: milter %s", myname, milter->m.name);
+
+    /*
+     * The next read on this Milter socket happens in a different process. It
+     * will not automatically flush the output buffer in this process.
+     */
+    if (milter->fp)
+	vstream_fflush(milter->fp);
+
+    if (attr_print(stream, ATTR_FLAG_MORE,
+		   SEND_ATTR_STR(MAIL_ATTR_MILT_NAME, milter->m.name),
+		   SEND_ATTR_INT(MAIL_ATTR_MILT_VERS, milter->version),
+		   SEND_ATTR_INT(MAIL_ATTR_MILT_ACTS, milter->rq_mask),
+		   SEND_ATTR_INT(MAIL_ATTR_MILT_EVTS, milter->ev_mask),
+		   SEND_ATTR_INT(MAIL_ATTR_MILT_NPTS, milter->np_mask),
+		   SEND_ATTR_INT(MAIL_ATTR_MILT_STAT, milter->state),
+		   SEND_ATTR_INT(MAIL_ATTR_MILT_CONN, milter->conn_timeout),
+		   SEND_ATTR_INT(MAIL_ATTR_MILT_CMD, milter->cmd_timeout),
+		   SEND_ATTR_INT(MAIL_ATTR_MILT_MSG, milter->msg_timeout),
+		   SEND_ATTR_STR(MAIL_ATTR_MILT_ACT, milter->def_action),
+		   SEND_ATTR_INT(MAIL_ATTR_MILT_MAC, milter->m.macros != 0),
+		   ATTR_TYPE_END) != 0
+	|| (milter->m.macros != 0
+	    && attr_print(stream, ATTR_FLAG_NONE,
+			  SEND_ATTR_FUNC(milter_macros_print,
+					 (void *) milter->m.macros),
+			  ATTR_TYPE_END) != 0)
+	|| (milter->m.macros == 0
+	    && attr_print(stream, ATTR_FLAG_NONE,
+			  ATTR_TYPE_END) != 0)
+	|| vstream_fflush(stream) != 0) {
+	return (-1);
+#ifdef CANT_WRITE_BEFORE_SENDING_FD
+    } else if (attr_scan(stream, ATTR_FLAG_STRICT,
+			 RECV_ATTR_STR(MAIL_ATTR_DUMMY, milter->buf),
+			 ATTR_TYPE_END) != 1) {
+	return (-1);
+#endif
+    } else if (LOCAL_SEND_FD(vstream_fileno(stream),
+			     vstream_fileno(milter->fp)) < 0) {
+	return (-1);
+#ifdef MUST_READ_AFTER_SENDING_FD
+    } else if (attr_scan(stream, ATTR_FLAG_STRICT,
+			 RECV_ATTR_STR(MAIL_ATTR_DUMMY, milter->buf),
+			 ATTR_TYPE_END) != 1) {
+	return (-1);
+#endif
+    } else {
+	return (0);
+    }
+}
+
+static MILTER8 *milter8_alloc(const char *, int, int, int, const char *,
+			              const char *, MILTERS *);
+
+/* milter8_receive - receive milter instance */
+
+MILTER *milter8_receive(VSTREAM *stream, MILTERS *parent)
+{
+    const char *myname = "milter8_receive";
+    static VSTRING *name_buf;
+    static VSTRING *act_buf;
+    MILTER8 *milter;
+    int     version;
+    int     rq_mask;
+    int     ev_mask;
+    int     np_mask;
+    int     state;
+    int     conn_timeout;
+    int     cmd_timeout;
+    int     msg_timeout;
+    int     fd;
+    int     has_macros;
+    MILTER_MACROS *macros = 0;
+
+#define FREE_MACROS_AND_RETURN(x) do { \
+	if (macros) \
+	    milter_macros_free(macros); \
+	return (x); \
+    } while (0)
+
+    if (name_buf == 0) {
+	name_buf = vstring_alloc(10);
+	act_buf = vstring_alloc(10);
+    }
+    if (attr_scan(stream, ATTR_FLAG_STRICT | ATTR_FLAG_MORE,
+		  RECV_ATTR_STR(MAIL_ATTR_MILT_NAME, name_buf),
+		  RECV_ATTR_INT(MAIL_ATTR_MILT_VERS, &version),
+		  RECV_ATTR_INT(MAIL_ATTR_MILT_ACTS, &rq_mask),
+		  RECV_ATTR_INT(MAIL_ATTR_MILT_EVTS, &ev_mask),
+		  RECV_ATTR_INT(MAIL_ATTR_MILT_NPTS, &np_mask),
+		  RECV_ATTR_INT(MAIL_ATTR_MILT_STAT, &state),
+		  RECV_ATTR_INT(MAIL_ATTR_MILT_CONN, &conn_timeout),
+		  RECV_ATTR_INT(MAIL_ATTR_MILT_CMD, &cmd_timeout),
+		  RECV_ATTR_INT(MAIL_ATTR_MILT_MSG, &msg_timeout),
+		  RECV_ATTR_STR(MAIL_ATTR_MILT_ACT, act_buf),
+		  RECV_ATTR_INT(MAIL_ATTR_MILT_MAC, &has_macros),
+		  ATTR_TYPE_END) < 10
+	|| (has_macros != 0
+	    && attr_scan(stream, ATTR_FLAG_STRICT,
+			 RECV_ATTR_FUNC(milter_macros_scan,
+					(void *) (macros =
+			    milter_macros_alloc(MILTER_MACROS_ALLOC_ZERO))),
+			 ATTR_TYPE_END) < 1)
+	|| (has_macros == 0
+	    && attr_scan(stream, ATTR_FLAG_STRICT,
+			 ATTR_TYPE_END) < 0)) {
+	FREE_MACROS_AND_RETURN(0);
+#ifdef CANT_WRITE_BEFORE_SENDING_FD
+    } else if (attr_print(stream, ATTR_FLAG_NONE,
+			  SEND_ATTR_STR(MAIL_ATTR_DUMMY, ""),
+			  ATTR_TYPE_END) != 0
+	       || vstream_fflush(stream) != 0) {
+	FREE_MACROS_AND_RETURN(0);
+#endif
+    } else if ((fd = LOCAL_RECV_FD(vstream_fileno(stream))) < 0) {
+	FREE_MACROS_AND_RETURN(0);
+    } else {
+#ifdef MUST_READ_AFTER_SENDING_FD
+	(void) attr_print(stream, ATTR_FLAG_NONE,
+			  SEND_ATTR_STR(MAIL_ATTR_DUMMY, ""),
+			  ATTR_TYPE_END);
+#endif
+#define NO_PROTOCOL	((char *) 0)
+
+	if (msg_verbose)
+	    msg_info("%s: milter %s", myname, STR(name_buf));
+
+	milter = milter8_alloc(STR(name_buf), conn_timeout, cmd_timeout,
+			    msg_timeout, NO_PROTOCOL, STR(act_buf), parent);
+	milter->fp = vstream_fdopen(fd, O_RDWR);
+	milter->m.macros = macros;
+	vstream_control(milter->fp, CA_VSTREAM_CTL_DOUBLE, CA_VSTREAM_CTL_END);
+	/* Avoid poor performance when TCP MSS > VSTREAM_BUFSIZE. */
+	vstream_tweak_sock(milter->fp);
+	milter->version = version;
+	milter->rq_mask = rq_mask;
+	milter->ev_mask = ev_mask;
+	milter->np_mask = np_mask;
+	milter->state = state;
+	return (&milter->m);
+    }
+}
+
+/* milter8_free - destroy Milter instance */
+
+static void milter8_free(MILTER *m)
+{
+    MILTER8 *milter = (MILTER8 *) m;
+
+    if (msg_verbose)
+	msg_info("free milter %s", milter->m.name);
+    if (milter->fp)
+	(void) vstream_fclose(milter->fp);
+    myfree(milter->m.name);
+    vstring_free(milter->buf);
+    vstring_free(milter->body);
+    if (milter->protocol)
+	myfree(milter->protocol);
+    myfree(milter->def_action);
+    if (milter->def_reply)
+	myfree(milter->def_reply);
+    if (milter->m.macros)
+	milter_macros_free(milter->m.macros);
+    myfree((void *) milter);
+}
+
+/* milter8_alloc - create MTA-side Sendmail 8 Milter instance */
+
+static MILTER8 *milter8_alloc(const char *name, int conn_timeout,
+			              int cmd_timeout, int msg_timeout,
+			              const char *protocol,
+			              const char *def_action,
+			              MILTERS *parent)
+{
+    MILTER8 *milter;
+
+    /*
+     * Fill in the structure. Note: all strings must be copied.
+     * 
+     * XXX Sendmail 8 libmilter closes the MTA-to-filter socket when it finds
+     * out that the SMTP client has disconnected. Because of this, Postfix
+     * has to open a new MTA-to-filter socket for each SMTP client.
+     */
+    milter = (MILTER8 *) mymalloc(sizeof(*milter));
+    milter->m.name = mystrdup(name);
+    milter->m.flags = 0;
+    milter->m.next = 0;
+    milter->m.parent = parent;
+    milter->m.macros = 0;
+#ifdef LIBMILTER_AUTO_DISCONNECT
+    milter->m.connect_on_demand = (void (*) (struct MILTER *)) milter8_connect;
+#else
+    milter->m.connect_on_demand = 0;
+#endif
+    milter->m.conn_event = milter8_conn_event;
+    milter->m.helo_event = milter8_helo_event;
+    milter->m.mail_event = milter8_mail_event;
+    milter->m.rcpt_event = milter8_rcpt_event;
+    milter->m.data_event = milter8_data_event;	/* may be null */
+    milter->m.message = milter8_message;
+    milter->m.unknown_event = milter8_unknown_event;	/* may be null */
+    milter->m.other_event = milter8_other_event;
+    milter->m.abort = milter8_abort;
+    milter->m.disc_event = milter8_disc_event;
+    milter->m.active = milter8_active;
+    milter->m.send = milter8_send;
+    milter->m.free = milter8_free;
+    milter->fp = 0;
+    milter->buf = vstring_alloc(100);
+    milter->body = vstring_alloc(100);
+    milter->version = 0;
+    milter->rq_mask = 0;
+    milter->ev_mask = 0;
+    milter->state = MILTER8_STAT_CLOSED;
+    milter->conn_timeout = conn_timeout;
+    milter->cmd_timeout = cmd_timeout;
+    milter->msg_timeout = msg_timeout;
+    milter->protocol = (protocol ? mystrdup(protocol) : 0);
+    milter->def_action = mystrdup(def_action);
+    milter->def_reply = 0;
+    milter->skip_event_type = 0;
+
+    return (milter);
+}
+
+/* milter8_create - create MTA-side Sendmail 8 Milter instance */
+
+MILTER *milter8_create(const char *name, int conn_timeout, int cmd_timeout,
+		               int msg_timeout, const char *protocol,
+		               const char *def_action, MILTERS *parent)
+{
+    MILTER8 *milter;
+
+    /*
+     * Fill in the structure.
+     */
+    milter = milter8_alloc(name, conn_timeout, cmd_timeout, msg_timeout,
+			   protocol, def_action, parent);
+
+    /*
+     * XXX Sendmail 8 libmilter closes the MTA-to-filter socket when it finds
+     * out that the SMTP client has disconnected. Because of this, Postfix
+     * has to open a new MTA-to-filter socket for each SMTP client.
+     */
+#ifndef LIBMILTER_AUTO_DISCONNECT
+    milter8_connect(milter);
+#endif
+    return (&milter->m);
+}