Adding upstream version 3.7.10.upstream/3.7.10

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

1 files changed, 865 insertions, 0 deletions

diff --git a/src/qmqpd/qmqpd.c b/src/qmqpd/qmqpd.c
new file mode 100644
index 0000000..d94d33d
--- /dev/null
+++ b/src/qmqpd/qmqpd.c
@@ -0,0 +1,865 @@
+/*++
+/* NAME
+/*	qmqpd 8
+/* SUMMARY
+/*	Postfix QMQP server
+/* SYNOPSIS
+/*	\fBqmqpd\fR [generic Postfix daemon options]
+/* DESCRIPTION
+/*	The Postfix QMQP server receives one message per connection.
+/*	Each message is piped through the \fBcleanup\fR(8)
+/*	daemon, and is placed into the \fBincoming\fR queue as one
+/*	single queue file.  The program expects to be run from the
+/*	\fBmaster\fR(8) process manager.
+/*
+/*	The QMQP server implements one access policy: only explicitly
+/*	authorized client hosts are allowed to use the service.
+/* SECURITY
+/* .ad
+/* .fi
+/*	The QMQP server is moderately security-sensitive. It talks to QMQP
+/*	clients and to DNS servers on the network. The QMQP server can be
+/*	run chrooted at fixed low privilege.
+/* DIAGNOSTICS
+/*	Problems and transactions are logged to \fBsyslogd\fR(8)
+/*	or \fBpostlogd\fR(8).
+/* BUGS
+/*	The QMQP protocol provides only one server reply per message
+/*	delivery. It is therefore not possible to reject individual
+/*	recipients.
+/*
+/*	The QMQP protocol requires the server to receive the entire
+/*	message before replying. If a message is malformed, or if any
+/*	netstring component is longer than acceptable, Postfix replies
+/*	immediately and closes the connection. It is left up to the
+/*	client to handle the situation.
+/* CONFIGURATION PARAMETERS
+/* .ad
+/* .fi
+/*	Changes to \fBmain.cf\fR are picked up automatically, as \fBqmqpd\fR(8)
+/*	processes run for only a limited amount of time. Use the command
+/*	"\fBpostfix reload\fR" to speed up a change.
+/*
+/*	The text below provides only a parameter summary. See
+/*	\fBpostconf\fR(5) for more details including examples.
+/* CONTENT INSPECTION CONTROLS
+/* .ad
+/* .fi
+/* .IP "\fBcontent_filter (empty)\fR"
+/*	After the message is queued, send the entire message to the
+/*	specified \fItransport:destination\fR.
+/* .IP "\fBreceive_override_options (empty)\fR"
+/*	Enable or disable recipient validation, built-in content
+/*	filtering, or address mapping.
+/* SMTPUTF8 CONTROLS
+/* .ad
+/* .fi
+/*	Preliminary SMTPUTF8 support is introduced with Postfix 3.0.
+/* .IP "\fBsmtputf8_enable (yes)\fR"
+/*	Enable preliminary SMTPUTF8 support for the protocols described
+/*	in RFC 6531..6533.
+/* .IP "\fBsmtputf8_autodetect_classes (sendmail, verify)\fR"
+/*	Detect that a message requires SMTPUTF8 support for the specified
+/*	mail origin classes.
+/* .PP
+/*	Available in Postfix version 3.2 and later:
+/* .IP "\fBenable_idna2003_compatibility (no)\fR"
+/*	Enable 'transitional' compatibility between IDNA2003 and IDNA2008,
+/*	when converting UTF-8 domain names to/from the ASCII form that is
+/*	used for DNS lookups.
+/* RESOURCE AND RATE CONTROLS
+/* .ad
+/* .fi
+/* .IP "\fBline_length_limit (2048)\fR"
+/*	Upon input, long lines are chopped up into pieces of at most
+/*	this length; upon delivery, long lines are reconstructed.
+/* .IP "\fBhopcount_limit (50)\fR"
+/*	The maximal number of Received:  message headers that is allowed
+/*	in the primary message headers.
+/* .IP "\fBmessage_size_limit (10240000)\fR"
+/*	The maximal size in bytes of a message, including envelope information.
+/* .IP "\fBqmqpd_timeout (300s)\fR"
+/*	The time limit for sending or receiving information over the network.
+/* TROUBLE SHOOTING CONTROLS
+/* .ad
+/* .fi
+/* .IP "\fBdebug_peer_level (2)\fR"
+/*	The increment in verbose logging level when a nexthop destination,
+/*	remote client or server name or network address matches a pattern
+/*	given with the debug_peer_list parameter.
+/* .IP "\fBdebug_peer_list (empty)\fR"
+/*	Optional list of nexthop destination, remote client or server
+/*	name or network address patterns that, if matched, cause the verbose
+/*	logging level to increase by the amount specified in $debug_peer_level.
+/* .IP "\fBsoft_bounce (no)\fR"
+/*	Safety net to keep mail queued that would otherwise be returned to
+/*	the sender.
+/* TARPIT CONTROLS
+/* .ad
+/* .fi
+/* .IP "\fBqmqpd_error_delay (1s)\fR"
+/*	How long the Postfix QMQP server will pause before sending a negative
+/*	reply to the remote QMQP client.
+/* MISCELLANEOUS CONTROLS
+/* .ad
+/* .fi
+/* .IP "\fBconfig_directory (see 'postconf -d' output)\fR"
+/*	The default location of the Postfix main.cf and master.cf
+/*	configuration files.
+/* .IP "\fBdaemon_timeout (18000s)\fR"
+/*	How much time a Postfix daemon process may take to handle a
+/*	request before it is terminated by a built-in watchdog timer.
+/* .IP "\fBipc_timeout (3600s)\fR"
+/*	The time limit for sending or receiving information over an internal
+/*	communication channel.
+/* .IP "\fBmax_idle (100s)\fR"
+/*	The maximum amount of time that an idle Postfix daemon process waits
+/*	for an incoming connection before terminating voluntarily.
+/* .IP "\fBmax_use (100)\fR"
+/*	The maximal number of incoming connections that a Postfix daemon
+/*	process will service before terminating voluntarily.
+/* .IP "\fBprocess_id (read-only)\fR"
+/*	The process ID of a Postfix command or daemon process.
+/* .IP "\fBprocess_name (read-only)\fR"
+/*	The process name of a Postfix command or daemon process.
+/* .IP "\fBqmqpd_authorized_clients (empty)\fR"
+/*	What remote QMQP clients are allowed to connect to the Postfix QMQP
+/*	server port.
+/* .IP "\fBqueue_directory (see 'postconf -d' output)\fR"
+/*	The location of the Postfix top-level queue directory.
+/* .IP "\fBsyslog_facility (mail)\fR"
+/*	The syslog facility of Postfix logging.
+/* .IP "\fBsyslog_name (see 'postconf -d' output)\fR"
+/*	A prefix that is prepended to the process name in syslog
+/*	records, so that, for example, "smtpd" becomes "prefix/smtpd".
+/* .IP "\fBverp_delimiter_filter (-=+)\fR"
+/*	The characters Postfix accepts as VERP delimiter characters on the
+/*	Postfix \fBsendmail\fR(1) command line and in SMTP commands.
+/* .PP
+/*	Available in Postfix version 2.5 and later:
+/* .IP "\fBqmqpd_client_port_logging (no)\fR"
+/*	Enable logging of the remote QMQP client port in addition to
+/*	the hostname and IP address.
+/* .PP
+/*	Available in Postfix 3.3 and later:
+/* .IP "\fBservice_name (read-only)\fR"
+/*	The master.cf service name of a Postfix daemon process.
+/* SEE ALSO
+/*	http://cr.yp.to/proto/qmqp.html, QMQP protocol
+/*	cleanup(8), message canonicalization
+/*	master(8), process manager
+/*	postlogd(8), Postfix logging
+/*	syslogd(8), system logging
+/* README FILES
+/* .ad
+/* .fi
+/*	Use "\fBpostconf readme_directory\fR" or
+/*	"\fBpostconf html_directory\fR" to locate this information.
+/* .na
+/* .nf
+/*	QMQP_README, Postfix ezmlm-idx howto.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* HISTORY
+/* .ad
+/* .fi
+/*	The qmqpd service was introduced with Postfix version 1.1.
+/* 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 <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <stdarg.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mymalloc.h>
+#include <vstring.h>
+#include <vstream.h>
+#include <netstring.h>
+#include <dict.h>
+#include <inet_proto.h>
+
+/* Global library. */
+
+#include <mail_params.h>
+#include <mail_version.h>
+#include <record.h>
+#include <rec_type.h>
+#include <mail_proto.h>
+#include <cleanup_user.h>
+#include <mail_date.h>
+#include <mail_conf.h>
+#include <debug_peer.h>
+#include <mail_stream.h>
+#include <namadr_list.h>
+#include <quote_822_local.h>
+#include <match_parent_style.h>
+#include <lex_822.h>
+#include <verp_sender.h>
+#include <input_transp.h>
+#include <smtputf8.h>
+
+/* Single-threaded server skeleton. */
+
+#include <mail_server.h>
+
+/* Application-specific */
+
+#include <qmqpd.h>
+
+ /*
+  * Tunable parameters. Make sure that there is some bound on the length of a
+  * netstring, so that the mail system stays in control even when a malicious
+  * client sends netstrings of unreasonable length. The recipient count limit
+  * is enforced by the message size limit.
+  */
+int     var_qmqpd_timeout;
+int     var_qmqpd_err_sleep;
+char   *var_filter_xport;
+char   *var_qmqpd_clients;
+char   *var_input_transp;
+bool    var_qmqpd_client_port_log;
+
+ /*
+  * Silly little macros.
+  */
+#define STR(x)	vstring_str(x)
+#define LEN(x)	VSTRING_LEN(x)
+
+#define DO_LOG		1
+#define DONT_LOG	0
+
+ /*
+  * Access control. This service should be exposed only to explicitly
+  * authorized clients. There is no default authorization.
+  */
+static NAMADR_LIST *qmqpd_clients;
+
+ /*
+  * Transparency: before mail is queued, do we allow address mapping,
+  * automatic bcc, header/body checks?
+  */
+int     qmqpd_input_transp_mask;
+
+/* qmqpd_open_file - open a queue file */
+
+static void qmqpd_open_file(QMQPD_STATE *state)
+{
+    int     cleanup_flags;
+
+    /*
+     * Connect to the cleanup server. Log client name/address with queue ID.
+     */
+    cleanup_flags = input_transp_cleanup(CLEANUP_FLAG_MASK_EXTERNAL,
+					 qmqpd_input_transp_mask);
+    cleanup_flags |= smtputf8_autodetect(MAIL_SRC_MASK_QMQPD);
+    state->dest = mail_stream_service(MAIL_CLASS_PUBLIC, var_cleanup_service);
+    if (state->dest == 0
+	|| attr_print(state->dest->stream, ATTR_FLAG_NONE,
+		      SEND_ATTR_INT(MAIL_ATTR_FLAGS, cleanup_flags),
+		      ATTR_TYPE_END) != 0)
+	msg_fatal("unable to connect to the %s %s service",
+		  MAIL_CLASS_PUBLIC, var_cleanup_service);
+    state->cleanup = state->dest->stream;
+    state->queue_id = mystrdup(state->dest->id);
+    msg_info("%s: client=%s", state->queue_id, state->namaddr);
+
+    /*
+     * Record the time of arrival. Optionally, enable content filtering (not
+     * bloody likely, but present for the sake of consistency with all other
+     * Postfix points of entrance).
+     */
+    rec_fprintf(state->cleanup, REC_TYPE_TIME, REC_TYPE_TIME_FORMAT,
+		REC_TYPE_TIME_ARG(state->arrival_time));
+    if (*var_filter_xport)
+	rec_fprintf(state->cleanup, REC_TYPE_FILT, "%s", var_filter_xport);
+}
+
+/* qmqpd_read_content - receive message content */
+
+static void qmqpd_read_content(QMQPD_STATE *state)
+{
+    state->where = "receiving message content";
+    netstring_get(state->client, state->message, var_message_limit);
+}
+
+/* qmqpd_copy_sender - copy envelope sender */
+
+static void qmqpd_copy_sender(QMQPD_STATE *state)
+{
+    char   *end_prefix;
+    char   *end_origin;
+    int     verp_requested;
+    static char verp_delims[] = "-=";
+
+    /*
+     * If the sender address looks like prefix@origin-@[], then request
+     * variable envelope return path delivery, with an envelope sender
+     * address of prefi@origin, and with VERP delimiters of x and =. This
+     * way, the recipients will see envelope sender addresses that look like:
+     * prefixuser=domain@origin.
+     */
+    state->where = "receiving sender address";
+    netstring_get(state->client, state->buf, var_line_limit);
+    VSTRING_TERMINATE(state->buf);
+    verp_requested =
+	((end_origin = vstring_end(state->buf) - 4) > STR(state->buf)
+	 && strcmp(end_origin, "-@[]") == 0
+	 && (end_prefix = strchr(STR(state->buf), '@')) != 0	/* XXX */
+	 && --end_prefix < end_origin - 2	/* non-null origin */
+	 && end_prefix > STR(state->buf));	/* non-null prefix */
+    if (verp_requested) {
+	verp_delims[0] = end_prefix[0];
+	if (verp_delims_verify(verp_delims) != 0) {
+	    state->err |= CLEANUP_STAT_CONT;	/* XXX */
+	    vstring_sprintf(state->why_rejected, "Invalid VERP delimiters: \"%s\". Need two characters from \"%s\"",
+			    verp_delims, var_verp_filter);
+	}
+	memmove(end_prefix, end_prefix + 1, end_origin - end_prefix - 1);
+	vstring_truncate(state->buf, end_origin - STR(state->buf) - 1);
+    }
+    if (state->err == CLEANUP_STAT_OK
+	&& REC_PUT_BUF(state->cleanup, REC_TYPE_FROM, state->buf) < 0)
+	state->err = CLEANUP_STAT_WRITE;
+    if (verp_requested)
+	if (state->err == CLEANUP_STAT_OK
+	    && rec_put(state->cleanup, REC_TYPE_VERP, verp_delims, 2) < 0)
+	    state->err = CLEANUP_STAT_WRITE;
+    state->sender = mystrndup(STR(state->buf), LEN(state->buf));
+}
+
+/* qmqpd_write_attributes - save session attributes */
+
+static void qmqpd_write_attributes(QMQPD_STATE *state)
+{
+
+    /*
+     * Logging attributes, also used for XFORWARD.
+     */
+    rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%s",
+		MAIL_ATTR_LOG_CLIENT_NAME, state->name);
+    rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%s",
+		MAIL_ATTR_LOG_CLIENT_ADDR, state->rfc_addr);
+    rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%s",
+		MAIL_ATTR_LOG_CLIENT_PORT, state->port);
+    rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%s",
+		MAIL_ATTR_LOG_ORIGIN, state->namaddr);
+    rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%s",
+		MAIL_ATTR_LOG_PROTO_NAME, state->protocol);
+
+    /*
+     * For consistency with the smtpd Milter client, we need to provide the
+     * real client attributes to the cleanup Milter client. This does not
+     * matter much with qmqpd which speaks to trusted clients only, but we
+     * want to be sure that the cleanup input protocol is ready when a new
+     * type of network daemon is added to receive mail from the Internet.
+     * 
+     * See also the comments in smtpd.c.
+     */
+    rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%s",
+		MAIL_ATTR_ACT_CLIENT_NAME, state->name);
+    rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%s",
+		MAIL_ATTR_ACT_CLIENT_ADDR, state->addr);
+    rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%s",
+		MAIL_ATTR_ACT_CLIENT_PORT, state->port);
+    rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%u",
+		MAIL_ATTR_ACT_CLIENT_AF, state->addr_family);
+    rec_fprintf(state->cleanup, REC_TYPE_ATTR, "%s=%s",
+		MAIL_ATTR_ACT_PROTO_NAME, state->protocol);
+
+    /* XXX What about the address rewriting context? */
+}
+
+/* qmqpd_copy_recipients - copy message recipients */
+
+static void qmqpd_copy_recipients(QMQPD_STATE *state)
+{
+    int     ch;
+
+    /*
+     * Remember the first recipient. We are done when we read the over-all
+     * netstring terminator.
+     * 
+     * XXX This approach violates abstractions, but it is a heck of a lot more
+     * convenient than counting the over-all byte count down to zero, like
+     * qmail does.
+     */
+    state->where = "receiving recipient address";
+    while ((ch = VSTREAM_GETC(state->client)) != ',') {
+	vstream_ungetc(state->client, ch);
+	netstring_get(state->client, state->buf, var_line_limit);
+	if (state->err == CLEANUP_STAT_OK
+	    && REC_PUT_BUF(state->cleanup, REC_TYPE_RCPT, state->buf) < 0)
+	    state->err = CLEANUP_STAT_WRITE;
+	state->rcpt_count++;
+	if (state->recipient == 0)
+	    state->recipient = mystrndup(STR(state->buf), LEN(state->buf));
+    }
+}
+
+/* qmqpd_next_line - get line from buffer, return last char, newline, or -1 */
+
+static int qmqpd_next_line(VSTRING *message, char **start, int *len,
+			           char **next)
+{
+    char   *beyond = STR(message) + LEN(message);
+    char   *enough = *next + var_line_limit;
+    char   *cp;
+
+    /*
+     * Stop at newline or at some limit. Don't look beyond the end of the
+     * buffer.
+     */
+#define UCHARPTR(x) ((unsigned char *) (x))
+
+    for (cp = *start = *next; /* void */ ; cp++) {
+	if (cp >= beyond)
+	    return ((*len = (*next = cp) - *start) > 0 ? UCHARPTR(cp)[-1] : -1);
+	if (*cp == '\n')
+	    return ((*len = cp - *start), (*next = cp + 1), '\n');
+	if (cp >= enough)
+	    return ((*len = cp - *start), (*next = cp), UCHARPTR(cp)[-1]);
+    }
+}
+
+/* qmqpd_write_content - write the message content segment */
+
+static void qmqpd_write_content(QMQPD_STATE *state)
+{
+    char   *start;
+    char   *next;
+    int     len;
+    int     rec_type;
+    int     first = 1;
+    int     ch;
+
+    /*
+     * Start the message content segment. Prepend our own Received: header to
+     * the message content. List the recipient only when a message has one
+     * recipient. Otherwise, don't list the recipient to avoid revealing Bcc:
+     * recipients that are supposed to be invisible.
+     */
+    rec_fputs(state->cleanup, REC_TYPE_MESG, "");
+    rec_fprintf(state->cleanup, REC_TYPE_NORM, "Received: from %s (%s [%s])",
+		state->name, state->name, state->rfc_addr);
+    if (state->rcpt_count == 1 && state->recipient) {
+	rec_fprintf(state->cleanup, REC_TYPE_NORM,
+		    "\tby %s (%s) with %s id %s",
+		    var_myhostname, var_mail_name,
+		    state->protocol, state->queue_id);
+	quote_822_local(state->buf, state->recipient);
+	rec_fprintf(state->cleanup, REC_TYPE_NORM,
+		    "\tfor <%s>; %s", STR(state->buf),
+		    mail_date(state->arrival_time.tv_sec));
+    } else {
+	rec_fprintf(state->cleanup, REC_TYPE_NORM,
+		    "\tby %s (%s) with %s",
+		    var_myhostname, var_mail_name, state->protocol);
+	rec_fprintf(state->cleanup, REC_TYPE_NORM,
+		    "\tid %s; %s", state->queue_id,
+		    mail_date(state->arrival_time.tv_sec));
+    }
+#ifdef RECEIVED_ENVELOPE_FROM
+    quote_822_local(state->buf, state->sender);
+    rec_fprintf(state->cleanup, REC_TYPE_NORM,
+		"\t(envelope-from <%s>)", STR(state->buf));
+#endif
+
+    /*
+     * Write the message content.
+     * 
+     * XXX Force an empty record when the queue file content begins with
+     * whitespace, so that it won't be considered as being part of our own
+     * Received: header. What an ugly Kluge.
+     * 
+     * XXX Deal with UNIX-style From_ lines at the start of message content just
+     * in case.
+     */
+    for (next = STR(state->message); /* void */ ; /* void */ ) {
+	if ((ch = qmqpd_next_line(state->message, &start, &len, &next)) < 0)
+	    break;
+	if (ch == '\n')
+	    rec_type = REC_TYPE_NORM;
+	else
+	    rec_type = REC_TYPE_CONT;
+	if (first) {
+	    if (strncmp(start + strspn(start, ">"), "From ", 5) == 0) {
+		rec_fprintf(state->cleanup, rec_type,
+			    "X-Mailbox-Line: %.*s", len, start);
+		continue;
+	    }
+	    first = 0;
+	    if (len > 0 && IS_SPACE_TAB(start[0]))
+		rec_put(state->cleanup, REC_TYPE_NORM, "", 0);
+	}
+	if (rec_put(state->cleanup, rec_type, start, len) < 0) {
+	    state->err = CLEANUP_STAT_WRITE;
+	    return;
+	}
+    }
+}
+
+/* qmqpd_close_file - close queue file */
+
+static void qmqpd_close_file(QMQPD_STATE *state)
+{
+
+    /*
+     * Send the end-of-segment markers.
+     */
+    if (state->err == CLEANUP_STAT_OK)
+	if (rec_fputs(state->cleanup, REC_TYPE_XTRA, "") < 0
+	    || rec_fputs(state->cleanup, REC_TYPE_END, "") < 0
+	    || vstream_fflush(state->cleanup))
+	    state->err = CLEANUP_STAT_WRITE;
+
+    /*
+     * Finish the queue file or finish the cleanup conversation.
+     */
+    if (state->err == 0)
+	state->err = mail_stream_finish(state->dest, state->why_rejected);
+    else
+	mail_stream_cleanup(state->dest);
+    state->dest = 0;
+}
+
+/* qmqpd_reply - send status to client and optionally log message */
+
+static void qmqpd_reply(QMQPD_STATE *state, int log_message,
+			        int status_code, const char *fmt,...)
+{
+    va_list ap;
+
+    /*
+     * Optionally change hard errors into retryable ones. Send the reply and
+     * optionally log it. Always insert a delay before reporting a problem.
+     * This slows down software run-away conditions.
+     */
+    if (status_code == QMQPD_STAT_HARD && var_soft_bounce)
+	status_code = QMQPD_STAT_RETRY;
+    VSTRING_RESET(state->buf);
+    VSTRING_ADDCH(state->buf, status_code);
+    va_start(ap, fmt);
+    vstring_vsprintf_append(state->buf, fmt, ap);
+    va_end(ap);
+    NETSTRING_PUT_BUF(state->client, state->buf);
+    if (log_message)
+	(status_code == QMQPD_STAT_OK ? msg_info : msg_warn) ("%s: %s: %s",
+		      state->queue_id, state->namaddr, STR(state->buf) + 1);
+    if (status_code != QMQPD_STAT_OK)
+	sleep(var_qmqpd_err_sleep);
+    netstring_fflush(state->client);
+}
+
+/* qmqpd_send_status - send mail transaction completion status */
+
+static void qmqpd_send_status(QMQPD_STATE *state)
+{
+
+    /*
+     * One message may suffer from multiple errors, so complain only about
+     * the most severe error.
+     * 
+     * See also: smtpd.c
+     */
+    state->where = "sending completion status";
+
+    if (state->err == CLEANUP_STAT_OK) {
+	qmqpd_reply(state, DONT_LOG, QMQPD_STAT_OK,
+		    "Ok: queued as %s", state->queue_id);
+    } else if ((state->err & CLEANUP_STAT_DEFER) != 0) {
+	qmqpd_reply(state, DO_LOG, QMQPD_STAT_RETRY,
+		    "Error: %s", STR(state->why_rejected));
+    } else if ((state->err & CLEANUP_STAT_BAD) != 0) {
+	qmqpd_reply(state, DO_LOG, QMQPD_STAT_RETRY,
+		    "Error: internal error %d", state->err);
+    } else if ((state->err & CLEANUP_STAT_SIZE) != 0) {
+	qmqpd_reply(state, DO_LOG, QMQPD_STAT_HARD,
+		    "Error: message too large");
+    } else if ((state->err & CLEANUP_STAT_HOPS) != 0) {
+	qmqpd_reply(state, DO_LOG, QMQPD_STAT_HARD,
+		    "Error: too many hops");
+    } else if ((state->err & CLEANUP_STAT_CONT) != 0) {
+	qmqpd_reply(state, DO_LOG, STR(state->why_rejected)[0] == '4' ?
+		    QMQPD_STAT_RETRY : QMQPD_STAT_HARD,
+		    "Error: %s", STR(state->why_rejected));
+    } else if ((state->err & CLEANUP_STAT_WRITE) != 0) {
+	qmqpd_reply(state, DO_LOG, QMQPD_STAT_RETRY,
+		    "Error: queue file write error");
+    } else if ((state->err & CLEANUP_STAT_RCPT) != 0) {
+	qmqpd_reply(state, DO_LOG, QMQPD_STAT_HARD,
+		    "Error: no recipients specified");
+    } else {
+	qmqpd_reply(state, DO_LOG, QMQPD_STAT_RETRY,
+		    "Error: internal error %d", state->err);
+    }
+}
+
+/* qmqpd_receive - receive QMQP message+sender+recipients */
+
+static void qmqpd_receive(QMQPD_STATE *state)
+{
+
+    /*
+     * Open a queue file. This must be first so that we can simplify the
+     * error logging and always include the queue ID information.
+     */
+    qmqpd_open_file(state);
+
+    /*
+     * Read and ignore the over-all netstring length indicator.
+     */
+    state->where = "receiving QMQP packet header";
+    (void) netstring_get_length(state->client);
+
+    /*
+     * XXX Read the message content into memory, because Postfix expects to
+     * store the sender before storing the message content. Fixing that
+     * requires changes to pickup, cleanup, qmgr, and perhaps elsewhere, so
+     * that will have to happen later when I have more time. However, QMQP is
+     * used for mailing list distribution, so the bulk of the volume is
+     * expected to be not message content but recipients, and recipients are
+     * not accumulated in memory.
+     */
+    qmqpd_read_content(state);
+
+    /*
+     * Read and write the envelope sender.
+     */
+    qmqpd_copy_sender(state);
+
+    /*
+     * Record some session attributes.
+     */
+    qmqpd_write_attributes(state);
+
+    /*
+     * Read and write the envelope recipients, including the optional big
+     * brother recipient.
+     */
+    qmqpd_copy_recipients(state);
+
+    /*
+     * Start the message content segment, prepend our own Received: header,
+     * and write the message content.
+     */
+    if (state->err == 0)
+	qmqpd_write_content(state);
+
+    /*
+     * Close the queue file.
+     */
+    qmqpd_close_file(state);
+
+    /*
+     * Report the completion status to the client.
+     */
+    qmqpd_send_status(state);
+}
+
+/* qmqpd_proto - speak the QMQP "protocol" */
+
+static void qmqpd_proto(QMQPD_STATE *state)
+{
+    int     status;
+
+    netstring_setup(state->client, var_qmqpd_timeout);
+
+    switch (status = vstream_setjmp(state->client)) {
+
+    default:
+	msg_panic("qmqpd_proto: unknown status %d", status);
+
+    case NETSTRING_ERR_EOF:
+	state->reason = "lost connection";
+	break;
+
+    case NETSTRING_ERR_TIME:
+	state->reason = "read/write timeout";
+	break;
+
+    case NETSTRING_ERR_FORMAT:
+	state->reason = "netstring format error";
+	if (vstream_setjmp(state->client) == 0)
+	    if (state->reason && state->where)
+		qmqpd_reply(state, DONT_LOG, QMQPD_STAT_HARD, "%s while %s",
+			    state->reason, state->where);
+	break;
+
+    case NETSTRING_ERR_SIZE:
+	state->reason = "netstring length exceeds storage limit";
+	if (vstream_setjmp(state->client) == 0)
+	    if (state->reason && state->where)
+		qmqpd_reply(state, DONT_LOG, QMQPD_STAT_HARD, "%s while %s",
+			    state->reason, state->where);
+	break;
+
+    case 0:
+
+	/*
+	 * See if we want to talk to this client at all.
+	 */
+	if (namadr_list_match(qmqpd_clients, state->name, state->addr) != 0) {
+	    qmqpd_receive(state);
+	} else if (qmqpd_clients->error == 0) {
+	    qmqpd_reply(state, DONT_LOG, QMQPD_STAT_HARD,
+			"Error: %s is not authorized to use this service",
+			state->namaddr);
+	} else {
+	    qmqpd_reply(state, DONT_LOG, QMQPD_STAT_RETRY,
+			"Error: server configuration error");
+	}
+	break;
+    }
+
+    /*
+     * Log abnormal session termination. Indicate the last recognized state
+     * before things went wrong.
+     */
+    if (state->reason && state->where)
+	msg_info("%s: %s: %s while %s",
+		 state->queue_id ? state->queue_id : "NOQUEUE",
+		 state->namaddr, state->reason, state->where);
+}
+
+/* qmqpd_service - service one client */
+
+static void qmqpd_service(VSTREAM *stream, char *unused_service, char **argv)
+{
+    QMQPD_STATE *state;
+
+    /*
+     * Sanity check. This service takes no command-line arguments.
+     */
+    if (argv[0])
+	msg_fatal("unexpected command-line argument: %s", argv[0]);
+
+    /*
+     * For sanity, require that at least one of INET or INET6 is enabled.
+     * Otherwise, we can't look up interface information, and we can't
+     * convert names or addresses.
+     */
+    if (inet_proto_info()->ai_family_list[0] == 0)
+	msg_fatal("all network protocols are disabled (%s = %s)",
+		  VAR_INET_PROTOCOLS, var_inet_protocols);
+
+    /*
+     * This routine runs when a client has connected to our network port.
+     * Look up and sanitize the peer name and initialize some connection-
+     * specific state.
+     */
+    state = qmqpd_state_alloc(stream);
+
+    /*
+     * See if we need to turn on verbose logging for this client.
+     */
+    debug_peer_check(state->name, state->addr);
+
+    /*
+     * Provide the QMQP service.
+     */
+    msg_info("connect from %s", state->namaddr);
+    qmqpd_proto(state);
+    msg_info("disconnect from %s", state->namaddr);
+
+    /*
+     * After the client has gone away, clean up whatever we have set up at
+     * connection time.
+     */
+    debug_peer_restore();
+    qmqpd_state_free(state);
+}
+
+/* pre_accept - see if tables have changed */
+
+static void pre_accept(char *unused_name, char **unused_argv)
+{
+    const char *table;
+
+    if ((table = dict_changed_name()) != 0) {
+	msg_info("table %s has changed -- restarting", table);
+	exit(0);
+    }
+}
+
+/* pre_jail_init - pre-jail initialization */
+
+static void pre_jail_init(char *unused_name, char **unused_argv)
+{
+    debug_peer_init();
+    qmqpd_clients =
+	namadr_list_init(VAR_QMQPD_CLIENTS, MATCH_FLAG_RETURN
+			 | match_parent_style(VAR_QMQPD_CLIENTS),
+			 var_qmqpd_clients);
+}
+
+/* post_jail_init - post-jail initialization */
+
+static void post_jail_init(char *unused_name, char **unused_argv)
+{
+
+    /*
+     * Initialize the receive transparency options: do we want unknown
+     * recipient checks, do we want address mapping.
+     */
+    qmqpd_input_transp_mask =
+    input_transp_mask(VAR_INPUT_TRANSP, var_input_transp);
+}
+
+MAIL_VERSION_STAMP_DECLARE;
+
+/* main - the main program */
+
+int     main(int argc, char **argv)
+{
+    static const CONFIG_TIME_TABLE time_table[] = {
+	VAR_QMTPD_TMOUT, DEF_QMTPD_TMOUT, &var_qmqpd_timeout, 1, 0,
+	VAR_QMTPD_ERR_SLEEP, DEF_QMTPD_ERR_SLEEP, &var_qmqpd_err_sleep, 0, 0,
+	0,
+    };
+    static const CONFIG_STR_TABLE str_table[] = {
+	VAR_FILTER_XPORT, DEF_FILTER_XPORT, &var_filter_xport, 0, 0,
+	VAR_QMQPD_CLIENTS, DEF_QMQPD_CLIENTS, &var_qmqpd_clients, 0, 0,
+	VAR_INPUT_TRANSP, DEF_INPUT_TRANSP, &var_input_transp, 0, 0,
+	0,
+    };
+    static const CONFIG_BOOL_TABLE bool_table[] = {
+	VAR_QMQPD_CLIENT_PORT_LOG, DEF_QMQPD_CLIENT_PORT_LOG, &var_qmqpd_client_port_log,
+	0,
+    };
+
+    /*
+     * Fingerprint executables and core dumps.
+     */
+    MAIL_VERSION_STAMP_ALLOCATE;
+
+    /*
+     * Pass control to the single-threaded service skeleton.
+     */
+    single_server_main(argc, argv, qmqpd_service,
+		       CA_MAIL_SERVER_TIME_TABLE(time_table),
+		       CA_MAIL_SERVER_STR_TABLE(str_table),
+		       CA_MAIL_SERVER_BOOL_TABLE(bool_table),
+		       CA_MAIL_SERVER_PRE_INIT(pre_jail_init),
+		       CA_MAIL_SERVER_PRE_ACCEPT(pre_accept),
+		       CA_MAIL_SERVER_POST_INIT(post_jail_init),
+		       0);
+}