Adding upstream version 3.4.23.upstream/3.4.23upstream

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

1 files changed, 680 insertions, 0 deletions

diff --git a/src/bounce/bounce.c b/src/bounce/bounce.c
new file mode 100644
index 0000000..afbeb63
--- /dev/null
+++ b/src/bounce/bounce.c
@@ -0,0 +1,680 @@
+/*++
+/* NAME
+/*	bounce 8
+/* SUMMARY
+/*	Postfix delivery status reports
+/* SYNOPSIS
+/*	\fBbounce\fR [generic Postfix daemon options]
+/* DESCRIPTION
+/*	The \fBbounce\fR(8) daemon maintains per-message log files with
+/*	delivery status information. Each log file is named after the
+/*	queue file that it corresponds to, and is kept in a queue subdirectory
+/*	named after the service name in the \fBmaster.cf\fR file (either
+/*	\fBbounce\fR, \fBdefer\fR or \fBtrace\fR).
+/*	This program expects to be run from the \fBmaster\fR(8) process
+/*	manager.
+/*
+/*	The \fBbounce\fR(8) daemon processes two types of service requests:
+/* .IP \(bu
+/*	Append a recipient (non-)delivery status record to a per-message
+/*	log file.
+/* .IP \(bu
+/*	Enqueue a delivery status notification message, with a copy
+/*	of a per-message log file and of the corresponding message.
+/*	When the delivery status notification message is
+/*	enqueued successfully, the per-message log file is deleted.
+/* .PP
+/*	The software does a best notification effort. A non-delivery
+/*	notification is sent even when the log file or the original
+/*	message cannot be read.
+/*
+/*	Optionally, a bounce (defer, trace) client can request that the
+/*	per-message log file be deleted when the requested operation fails.
+/*	This is used by clients that cannot retry transactions by
+/*	themselves, and that depend on retry logic in their own client.
+/* STANDARDS
+/*	RFC 822 (ARPA Internet Text Messages)
+/*	RFC 2045 (Format of Internet Message Bodies)
+/*	RFC 2822 (Internet Message Format)
+/*	RFC 3462 (Delivery Status Notifications)
+/*	RFC 3464 (Delivery Status Notifications)
+/*	RFC 3834 (Auto-Submitted: message header)
+/*	RFC 5322 (Internet Message Format)
+/*	RFC 6531 (Internationalized SMTP)
+/*	RFC 6532 (Internationalized Message Format)
+/*	RFC 6533 (Internationalized Delivery Status Notifications)
+/* DIAGNOSTICS
+/*	Problems and transactions are logged to \fBsyslogd\fR(8)
+/*	or \fBpostlogd\fR(8).
+/* CONFIGURATION PARAMETERS
+/* .ad
+/* .fi
+/*	Changes to \fBmain.cf\fR are picked up automatically, as \fBbounce\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.
+/* .IP "\fB2bounce_notice_recipient (postmaster)\fR"
+/*	The recipient of undeliverable mail that cannot be returned to
+/*	the sender.
+/* .IP "\fBbackwards_bounce_logfile_compatibility (yes)\fR"
+/*	Produce additional \fBbounce\fR(8) logfile records that can be read by
+/*	Postfix versions before 2.0.
+/* .IP "\fBbounce_notice_recipient (postmaster)\fR"
+/*	The recipient of postmaster notifications with the message headers
+/*	of mail that Postfix did not deliver and of SMTP conversation
+/*	transcripts of mail that Postfix did not receive.
+/* .IP "\fBbounce_size_limit (50000)\fR"
+/*	The maximal amount of original message text that is sent in a
+/*	non-delivery notification.
+/* .IP "\fBbounce_template_file (empty)\fR"
+/*	Pathname of a configuration file with bounce message templates.
+/* .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 "\fBdelay_notice_recipient (postmaster)\fR"
+/*	The recipient of postmaster notifications with the message headers
+/*	of mail that cannot be delivered within $delay_warning_time time
+/*	units.
+/* .IP "\fBdeliver_lock_attempts (20)\fR"
+/*	The maximal number of attempts to acquire an exclusive lock on a
+/*	mailbox file or \fBbounce\fR(8) logfile.
+/* .IP "\fBdeliver_lock_delay (1s)\fR"
+/*	The time between attempts to acquire an exclusive lock on a mailbox
+/*	file or \fBbounce\fR(8) logfile.
+/* .IP "\fBipc_timeout (3600s)\fR"
+/*	The time limit for sending or receiving information over an internal
+/*	communication channel.
+/* .IP "\fBinternal_mail_filter_classes (empty)\fR"
+/*	What categories of Postfix-generated mail are subject to
+/*	before-queue content inspection by non_smtpd_milters, header_checks
+/*	and body_checks.
+/* .IP "\fBmail_name (Postfix)\fR"
+/*	The mail system name that is displayed in Received: headers, in
+/*	the SMTP greeting banner, and in bounced mail.
+/* .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 "\fBnotify_classes (resource, software)\fR"
+/*	The list of error classes that are reported to the postmaster.
+/* .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 "\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".
+/* .PP
+/*	Available in Postfix 3.0 and later:
+/* .IP "\fBsmtputf8_autodetect_classes (sendmail, verify)\fR"
+/*	Detect that a message requires SMTPUTF8 support for the specified
+/*	mail origin classes.
+/* .PP
+/*	Available in Postfix 3.3 and later:
+/* .IP "\fBservice_name (read-only)\fR"
+/*	The master.cf service name of a Postfix daemon process.
+/* FILES
+/*	/var/spool/postfix/bounce/* non-delivery records
+/*	/var/spool/postfix/defer/* non-delivery records
+/*	/var/spool/postfix/trace/* delivery status records
+/* SEE ALSO
+/*	bounce(5), bounce message template format
+/*	qmgr(8), queue manager
+/*	postconf(5), configuration parameters
+/*	master(5), generic daemon options
+/*	master(8), process manager
+/*	postlogd(8), Postfix logging
+/*	syslogd(8), system logging
+/* 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 <string.h>
+#include <stdlib.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <vstring.h>
+#include <vstream.h>
+#include <stringops.h>
+#include <load_file.h>
+
+/* Global library. */
+
+#include <mail_proto.h>
+#include <mail_queue.h>
+#include <mail_params.h>
+#include <mail_version.h>
+#include <mail_conf.h>
+#include <bounce.h>
+#include <mail_addr.h>
+#include <rcpt_buf.h>
+#include <dsb_scan.h>
+
+/* Single-threaded server skeleton. */
+
+#include <mail_server.h>
+
+/* Application-specific. */
+
+#include <bounce_service.h>
+
+ /*
+  * Tunables.
+  */
+int     var_bounce_limit;
+int     var_max_queue_time;
+int     var_delay_warn_time;
+char   *var_notify_classes;
+char   *var_bounce_rcpt;
+char   *var_2bounce_rcpt;
+char   *var_delay_rcpt;
+char   *var_bounce_tmpl;
+
+ /*
+  * We're single threaded, so we can avoid some memory allocation overhead.
+  */
+static VSTRING *queue_id;
+static VSTRING *queue_name;
+static RCPT_BUF *rcpt_buf;
+static VSTRING *encoding;
+static VSTRING *sender;
+static VSTRING *dsn_envid;
+static VSTRING *verp_delims;
+static DSN_BUF *dsn_buf;
+
+ /*
+  * Templates.
+  */
+BOUNCE_TEMPLATES *bounce_templates;
+
+#define STR vstring_str
+
+#define VS_NEUTER(s) printable(vstring_str(s), '?')
+
+/* bounce_append_proto - bounce_append server protocol */
+
+static int bounce_append_proto(char *service_name, VSTREAM *client)
+{
+    const char *myname = "bounce_append_proto";
+    int     flags;
+
+    /*
+     * Read and validate the client request.
+     */
+    if (mail_command_server(client,
+			    RECV_ATTR_INT(MAIL_ATTR_FLAGS, &flags),
+			    RECV_ATTR_STR(MAIL_ATTR_QUEUEID, queue_id),
+			    RECV_ATTR_FUNC(rcpb_scan, (void *) rcpt_buf),
+			    RECV_ATTR_FUNC(dsb_scan, (void *) dsn_buf),
+			    ATTR_TYPE_END) != 4) {
+	msg_warn("malformed request");
+	return (-1);
+    }
+
+    /*
+     * Sanitize input.
+     */
+    if (mail_queue_id_ok(STR(queue_id)) == 0) {
+	msg_warn("malformed queue id: %s", printable(STR(queue_id), '?'));
+	return (-1);
+    }
+    VS_NEUTER(rcpt_buf->address);
+    VS_NEUTER(rcpt_buf->orig_addr);
+    VS_NEUTER(rcpt_buf->dsn_orcpt);
+    VS_NEUTER(dsn_buf->status);
+    VS_NEUTER(dsn_buf->action);
+    VS_NEUTER(dsn_buf->reason);
+    VS_NEUTER(dsn_buf->dtype);
+    VS_NEUTER(dsn_buf->dtext);
+    VS_NEUTER(dsn_buf->mtype);
+    VS_NEUTER(dsn_buf->mname);
+    (void) RECIPIENT_FROM_RCPT_BUF(rcpt_buf);
+    (void) DSN_FROM_DSN_BUF(dsn_buf);
+
+    /*
+     * Beware: some DSN or RECIPIENT fields may be null; access dsn_buf and
+     * rcpt_buf buffers instead. See DSN_FROM_DSN_BUF() and
+     * RECIPIENT_FROM_RCPT_BUF().
+     */
+    if (msg_verbose)
+	msg_info("%s: flags=0x%x service=%s id=%s org_to=%s to=%s off=%ld dsn_org=%s, notif=0x%x stat=%s act=%s why=%s",
+		 myname, flags, service_name, STR(queue_id),
+		 STR(rcpt_buf->orig_addr), STR(rcpt_buf->address),
+		 rcpt_buf->offset, STR(rcpt_buf->dsn_orcpt),
+		 rcpt_buf->dsn_notify, STR(dsn_buf->status),
+		 STR(dsn_buf->action), STR(dsn_buf->reason));
+
+    /*
+     * On request by the client, set up a trap to delete the log file in case
+     * of errors.
+     */
+    if (flags & BOUNCE_FLAG_CLEAN)
+	bounce_cleanup_register(service_name, STR(queue_id));
+
+    /*
+     * Execute the request.
+     */
+    return (bounce_append_service(flags, service_name, STR(queue_id),
+				  &rcpt_buf->rcpt, &dsn_buf->dsn));
+}
+
+/* bounce_notify_proto - bounce_notify server protocol */
+
+static int bounce_notify_proto(char *service_name, VSTREAM *client,
+			        int (*service) (int, char *, char *, char *,
+				           char *, int, char *, char *, int,
+						        BOUNCE_TEMPLATES *))
+{
+    const char *myname = "bounce_notify_proto";
+    int     flags;
+    int     smtputf8;
+    int     dsn_ret;
+
+    /*
+     * Read and validate the client request.
+     */
+    if (mail_command_server(client,
+			    RECV_ATTR_INT(MAIL_ATTR_FLAGS, &flags),
+			    RECV_ATTR_STR(MAIL_ATTR_QUEUE, queue_name),
+			    RECV_ATTR_STR(MAIL_ATTR_QUEUEID, queue_id),
+			    RECV_ATTR_STR(MAIL_ATTR_ENCODING, encoding),
+			    RECV_ATTR_INT(MAIL_ATTR_SMTPUTF8, &smtputf8),
+			    RECV_ATTR_STR(MAIL_ATTR_SENDER, sender),
+			    RECV_ATTR_STR(MAIL_ATTR_DSN_ENVID, dsn_envid),
+			    RECV_ATTR_INT(MAIL_ATTR_DSN_RET, &dsn_ret),
+			    ATTR_TYPE_END) != 8) {
+	msg_warn("malformed request");
+	return (-1);
+    }
+
+    /*
+     * Sanitize input.
+     */
+    if (mail_queue_name_ok(STR(queue_name)) == 0) {
+	msg_warn("malformed queue name: %s", printable(STR(queue_name), '?'));
+	return (-1);
+    }
+    if (mail_queue_id_ok(STR(queue_id)) == 0) {
+	msg_warn("malformed queue id: %s", printable(STR(queue_id), '?'));
+	return (-1);
+    }
+    VS_NEUTER(encoding);
+    VS_NEUTER(sender);
+    VS_NEUTER(dsn_envid);
+    if (msg_verbose)
+	msg_info("%s: flags=0x%x service=%s queue=%s id=%s encoding=%s smtputf8=%d sender=%s envid=%s ret=0x%x",
+		 myname, flags, service_name, STR(queue_name), STR(queue_id),
+		 STR(encoding), smtputf8, STR(sender), STR(dsn_envid),
+		 dsn_ret);
+
+    /*
+     * On request by the client, set up a trap to delete the log file in case
+     * of errors.
+     */
+    if (flags & BOUNCE_FLAG_CLEAN)
+	bounce_cleanup_register(service_name, STR(queue_id));
+
+    /*
+     * Execute the request.
+     */
+    return (service(flags, service_name, STR(queue_name),
+		    STR(queue_id), STR(encoding), smtputf8,
+		    STR(sender), STR(dsn_envid), dsn_ret,
+		    bounce_templates));
+}
+
+/* bounce_verp_proto - bounce_notify server protocol, VERP style */
+
+static int bounce_verp_proto(char *service_name, VSTREAM *client)
+{
+    const char *myname = "bounce_verp_proto";
+    int     flags;
+    int     smtputf8;
+    int     dsn_ret;
+
+    /*
+     * Read and validate the client request.
+     */
+    if (mail_command_server(client,
+			    RECV_ATTR_INT(MAIL_ATTR_FLAGS, &flags),
+			    RECV_ATTR_STR(MAIL_ATTR_QUEUE, queue_name),
+			    RECV_ATTR_STR(MAIL_ATTR_QUEUEID, queue_id),
+			    RECV_ATTR_STR(MAIL_ATTR_ENCODING, encoding),
+			    RECV_ATTR_INT(MAIL_ATTR_SMTPUTF8, &smtputf8),
+			    RECV_ATTR_STR(MAIL_ATTR_SENDER, sender),
+			    RECV_ATTR_STR(MAIL_ATTR_DSN_ENVID, dsn_envid),
+			    RECV_ATTR_INT(MAIL_ATTR_DSN_RET, &dsn_ret),
+			    RECV_ATTR_STR(MAIL_ATTR_VERPDL, verp_delims),
+			    ATTR_TYPE_END) != 9) {
+	msg_warn("malformed request");
+	return (-1);
+    }
+
+    /*
+     * Sanitize input.
+     */
+    if (mail_queue_name_ok(STR(queue_name)) == 0) {
+	msg_warn("malformed queue name: %s", printable(STR(queue_name), '?'));
+	return (-1);
+    }
+    if (mail_queue_id_ok(STR(queue_id)) == 0) {
+	msg_warn("malformed queue id: %s", printable(STR(queue_id), '?'));
+	return (-1);
+    }
+    VS_NEUTER(encoding);
+    VS_NEUTER(sender);
+    VS_NEUTER(dsn_envid);
+    VS_NEUTER(verp_delims);
+    if (strlen(STR(verp_delims)) != 2) {
+	msg_warn("malformed verp delimiter string: %s", STR(verp_delims));
+	return (-1);
+    }
+    if (msg_verbose)
+	msg_info("%s: flags=0x%x service=%s queue=%s id=%s encoding=%s smtputf8=%d sender=%s envid=%s ret=0x%x delim=%s",
+		 myname, flags, service_name, STR(queue_name),
+		 STR(queue_id), STR(encoding), smtputf8, STR(sender),
+		 STR(dsn_envid), dsn_ret, STR(verp_delims));
+
+    /*
+     * On request by the client, set up a trap to delete the log file in case
+     * of errors.
+     */
+    if (flags & BOUNCE_FLAG_CLEAN)
+	bounce_cleanup_register(service_name, STR(queue_id));
+
+    /*
+     * Execute the request. Fall back to traditional notification if a bounce
+     * was returned as undeliverable, because we don't want to VERPify those.
+     */
+    if (!*STR(sender) || !strcasecmp_utf8(STR(sender),
+					  mail_addr_double_bounce())) {
+	msg_warn("request to send VERP-style notification of bounced mail");
+	return (bounce_notify_service(flags, service_name, STR(queue_name),
+				      STR(queue_id), STR(encoding), smtputf8,
+				      STR(sender), STR(dsn_envid), dsn_ret,
+				      bounce_templates));
+    } else
+	return (bounce_notify_verp(flags, service_name, STR(queue_name),
+				   STR(queue_id), STR(encoding), smtputf8,
+				   STR(sender), STR(dsn_envid), dsn_ret,
+				   STR(verp_delims), bounce_templates));
+}
+
+/* bounce_one_proto - bounce_one server protocol */
+
+static int bounce_one_proto(char *service_name, VSTREAM *client)
+{
+    const char *myname = "bounce_one_proto";
+    int     flags;
+    int     smtputf8;
+    int     dsn_ret;
+
+    /*
+     * Read and validate the client request.
+     */
+    if (mail_command_server(client,
+			    RECV_ATTR_INT(MAIL_ATTR_FLAGS, &flags),
+			    RECV_ATTR_STR(MAIL_ATTR_QUEUE, queue_name),
+			    RECV_ATTR_STR(MAIL_ATTR_QUEUEID, queue_id),
+			    RECV_ATTR_STR(MAIL_ATTR_ENCODING, encoding),
+			    RECV_ATTR_INT(MAIL_ATTR_SMTPUTF8, &smtputf8),
+			    RECV_ATTR_STR(MAIL_ATTR_SENDER, sender),
+			    RECV_ATTR_STR(MAIL_ATTR_DSN_ENVID, dsn_envid),
+			    RECV_ATTR_INT(MAIL_ATTR_DSN_RET, &dsn_ret),
+			    RECV_ATTR_FUNC(rcpb_scan, (void *) rcpt_buf),
+			    RECV_ATTR_FUNC(dsb_scan, (void *) dsn_buf),
+			    ATTR_TYPE_END) != 10) {
+	msg_warn("malformed request");
+	return (-1);
+    }
+
+    /*
+     * Sanitize input.
+     */
+    if (strcmp(service_name, MAIL_SERVICE_BOUNCE) != 0) {
+	msg_warn("wrong service name \"%s\" for one-recipient bouncing",
+		 service_name);
+	return (-1);
+    }
+    if (mail_queue_name_ok(STR(queue_name)) == 0) {
+	msg_warn("malformed queue name: %s", printable(STR(queue_name), '?'));
+	return (-1);
+    }
+    if (mail_queue_id_ok(STR(queue_id)) == 0) {
+	msg_warn("malformed queue id: %s", printable(STR(queue_id), '?'));
+	return (-1);
+    }
+    VS_NEUTER(encoding);
+    VS_NEUTER(sender);
+    VS_NEUTER(dsn_envid);
+    VS_NEUTER(rcpt_buf->address);
+    VS_NEUTER(rcpt_buf->orig_addr);
+    VS_NEUTER(rcpt_buf->dsn_orcpt);
+    VS_NEUTER(dsn_buf->status);
+    VS_NEUTER(dsn_buf->action);
+    VS_NEUTER(dsn_buf->reason);
+    VS_NEUTER(dsn_buf->dtype);
+    VS_NEUTER(dsn_buf->dtext);
+    VS_NEUTER(dsn_buf->mtype);
+    VS_NEUTER(dsn_buf->mname);
+    (void) RECIPIENT_FROM_RCPT_BUF(rcpt_buf);
+    (void) DSN_FROM_DSN_BUF(dsn_buf);
+
+    /*
+     * Beware: some DSN or RECIPIENT fields may be null; access dsn_buf and
+     * rcpt_buf buffers instead. See DSN_FROM_DSN_BUF() and
+     * RECIPIENT_FROM_RCPT_BUF().
+     */
+    if (msg_verbose)
+	msg_info("%s: flags=0x%x queue=%s id=%s encoding=%s smtputf8=%d sender=%s envid=%s dsn_ret=0x%x orig_to=%s to=%s off=%ld dsn_orig=%s notif=0x%x stat=%s act=%s why=%s",
+		 myname, flags, STR(queue_name), STR(queue_id),
+		 STR(encoding), smtputf8, STR(sender), STR(dsn_envid),
+		 dsn_ret, STR(rcpt_buf->orig_addr), STR(rcpt_buf->address),
+		 rcpt_buf->offset, STR(rcpt_buf->dsn_orcpt),
+		 rcpt_buf->dsn_notify, STR(dsn_buf->status),
+		 STR(dsn_buf->action), STR(dsn_buf->reason));
+
+    /*
+     * Execute the request.
+     */
+    return (bounce_one_service(flags, STR(queue_name), STR(queue_id),
+			       STR(encoding), smtputf8, STR(sender),
+			       STR(dsn_envid), dsn_ret, rcpt_buf,
+			       dsn_buf, bounce_templates));
+}
+
+/* bounce_service - parse bounce command type and delegate */
+
+static void bounce_service(VSTREAM *client, char *service_name, char **argv)
+{
+    int     command;
+    int     status;
+
+    /*
+     * Sanity check. This service takes no command-line arguments. The
+     * service name should be usable as a subdirectory name.
+     */
+    if (argv[0])
+	msg_fatal("unexpected command-line argument: %s", argv[0]);
+    if (mail_queue_name_ok(service_name) == 0)
+	msg_fatal("malformed service name: %s", service_name);
+
+    /*
+     * Read and validate the first parameter of the client request. Let the
+     * request-specific protocol routines take care of the remainder.
+     */
+    if (attr_scan(client, ATTR_FLAG_STRICT | ATTR_FLAG_MORE,
+		  RECV_ATTR_INT(MAIL_ATTR_NREQ, &command), 0) != 1) {
+	msg_warn("malformed request");
+	status = -1;
+    } else if (command == BOUNCE_CMD_VERP) {
+	status = bounce_verp_proto(service_name, client);
+    } else if (command == BOUNCE_CMD_FLUSH) {
+	status = bounce_notify_proto(service_name, client,
+				     bounce_notify_service);
+    } else if (command == BOUNCE_CMD_WARN) {
+	status = bounce_notify_proto(service_name, client,
+				     bounce_warn_service);
+    } else if (command == BOUNCE_CMD_TRACE) {
+	status = bounce_notify_proto(service_name, client,
+				     bounce_trace_service);
+    } else if (command == BOUNCE_CMD_APPEND) {
+	status = bounce_append_proto(service_name, client);
+    } else if (command == BOUNCE_CMD_ONE) {
+	status = bounce_one_proto(service_name, client);
+    } else {
+	msg_warn("unknown command: %d", command);
+	status = -1;
+    }
+
+    /*
+     * When the request has completed, send the completion status to the
+     * client.
+     */
+    attr_print(client, ATTR_FLAG_NONE,
+	       SEND_ATTR_INT(MAIL_ATTR_STATUS, status),
+	       ATTR_TYPE_END);
+    vstream_fflush(client);
+
+    /*
+     * When a cleanup trap was set, delete the log file in case of error.
+     * This includes errors while sending the completion status to the
+     * client.
+     */
+    if (bounce_cleanup_path) {
+	if (status || vstream_ferror(client))
+	    bounce_cleanup_log();
+	bounce_cleanup_unregister();
+    }
+}
+
+static void load_helper(VSTREAM *stream, void *context)
+{
+    BOUNCE_TEMPLATES *templates = (BOUNCE_TEMPLATES *) context;
+
+    bounce_templates_load(stream, templates);
+}
+
+/* pre_jail_init - pre-jail initialization */
+
+static void pre_jail_init(char *unused_name, char **unused_argv)
+{
+
+    /*
+     * Bundle up a bunch of bounce template information.
+     */
+    bounce_templates = bounce_templates_create();
+
+    /*
+     * Load the alternate message files (if specified) before entering the
+     * chroot jail.
+     */
+    if (*var_bounce_tmpl)
+	load_file(var_bounce_tmpl, load_helper, (void *) bounce_templates);
+}
+
+/* post_jail_init - initialize after entering chroot jail */
+
+static void post_jail_init(char *service_name, char **unused_argv)
+{
+
+    /*
+     * Special case: dump bounce templates. This is not part of the master(5)
+     * public interface. This internal interface is used by the postconf
+     * command. It was implemented before bounce templates were isolated into
+     * modules that could have been called directly.
+     */
+    if (strcmp(service_name, "dump_templates") == 0) {
+	bounce_templates_dump(VSTREAM_OUT, bounce_templates);
+	vstream_fflush(VSTREAM_OUT);
+	exit(0);
+    }
+    if (strcmp(service_name, "expand_templates") == 0) {
+	bounce_templates_expand(VSTREAM_OUT, bounce_templates);
+	vstream_fflush(VSTREAM_OUT);
+	exit(0);
+    }
+
+    /*
+     * Initialize. We're single threaded so we can reuse some memory upon
+     * successive requests.
+     */
+    queue_id = vstring_alloc(10);
+    queue_name = vstring_alloc(10);
+    rcpt_buf = rcpb_create();
+    encoding = vstring_alloc(10);
+    sender = vstring_alloc(10);
+    dsn_envid = vstring_alloc(10);
+    verp_delims = vstring_alloc(10);
+    dsn_buf = dsb_create();
+}
+
+MAIL_VERSION_STAMP_DECLARE;
+
+/* main - the main program */
+
+int     main(int argc, char **argv)
+{
+    static const CONFIG_INT_TABLE int_table[] = {
+	VAR_BOUNCE_LIMIT, DEF_BOUNCE_LIMIT, &var_bounce_limit, 1, 0,
+	0,
+    };
+    static const CONFIG_TIME_TABLE time_table[] = {
+	VAR_MAX_QUEUE_TIME, DEF_MAX_QUEUE_TIME, &var_max_queue_time, 0, 8640000,
+	VAR_DELAY_WARN_TIME, DEF_DELAY_WARN_TIME, &var_delay_warn_time, 0, 0,
+	0,
+    };
+    static const CONFIG_STR_TABLE str_table[] = {
+	VAR_NOTIFY_CLASSES, DEF_NOTIFY_CLASSES, &var_notify_classes, 0, 0,
+	VAR_BOUNCE_RCPT, DEF_BOUNCE_RCPT, &var_bounce_rcpt, 1, 0,
+	VAR_2BOUNCE_RCPT, DEF_2BOUNCE_RCPT, &var_2bounce_rcpt, 1, 0,
+	VAR_DELAY_RCPT, DEF_DELAY_RCPT, &var_delay_rcpt, 1, 0,
+	VAR_BOUNCE_TMPL, DEF_BOUNCE_TMPL, &var_bounce_tmpl, 0, 0,
+	0,
+    };
+
+    /*
+     * Fingerprint executables and core dumps.
+     */
+    MAIL_VERSION_STAMP_ALLOCATE;
+
+    /*
+     * Pass control to the single-threaded service skeleton.
+     */
+    single_server_main(argc, argv, bounce_service,
+		       CA_MAIL_SERVER_INT_TABLE(int_table),
+		       CA_MAIL_SERVER_STR_TABLE(str_table),
+		       CA_MAIL_SERVER_TIME_TABLE(time_table),
+		       CA_MAIL_SERVER_PRE_INIT(pre_jail_init),
+		       CA_MAIL_SERVER_POST_INIT(post_jail_init),
+		       CA_MAIL_SERVER_UNLIMITED,
+		       0);
+}