Adding upstream version 3.5.24.upstream/3.5.24upstream

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

4 files changed, 750 insertions, 0 deletions

diff --git a/src/pickup/.indent.pro b/src/pickup/.indent.pro
new file mode 120000
index 0000000..5c837ec
--- /dev/null
+++ b/src/pickup/.indent.pro
@@ -0,0 +1 @@
+../../.indent.pro
\ No newline at end of file
diff --git a/src/pickup/.printfck b/src/pickup/.printfck
new file mode 100644
index 0000000..66016ed
--- /dev/null
+++ b/src/pickup/.printfck
@@ -0,0 +1,25 @@
+been_here_xt	2	0
+bounce_append	5	0
+cleanup_out_format	1	0
+defer_append	5	0
+mail_command	1	0
+mail_print	1	0
+msg_error	0	0
+msg_fatal	0	0
+msg_info	0	0
+msg_panic	0	0
+msg_warn	0	0
+opened		4	0
+post_mail_fprintf	1	0
+qmgr_message_bounce	2	0
+rec_fprintf	2	0
+sent	4	0
+smtp_cmd	1	0
+smtp_mesg_fail	2	0
+smtp_printf	1	0
+smtp_rcpt_fail	3	0
+smtp_site_fail	2	0
+udp_syslog	1	0
+vstream_fprintf	1	0
+vstream_printf	0	0
+vstring_sprintf	1	0
diff --git a/src/pickup/Makefile.in b/src/pickup/Makefile.in
new file mode 100644
index 0000000..9c8766f
--- /dev/null
+++ b/src/pickup/Makefile.in
@@ -0,0 +1,94 @@
+SHELL	= /bin/sh
+SRCS	= pickup.c
+OBJS	= pickup.o
+HDRS	= 
+TESTSRC	=
+DEFS	= -I. -I$(INC_DIR) -D$(SYSTYPE)
+CFLAGS	= $(DEBUG) $(OPT) $(DEFS)
+TESTPROG= 
+PROG	= pickup
+INC_DIR = ../../include
+LIBS	= ../../lib/lib$(LIB_PREFIX)master$(LIB_SUFFIX) \
+	../../lib/lib$(LIB_PREFIX)global$(LIB_SUFFIX) \
+	../../lib/lib$(LIB_PREFIX)util$(LIB_SUFFIX)
+
+.c.o:;	$(CC) $(CFLAGS) -c $*.c
+
+$(PROG): $(OBJS) $(LIBS)
+	$(CC) $(CFLAGS) $(SHLIB_RPATH) -o $@ $(OBJS) $(LIBS) $(SYSLIBS)
+
+$(OBJS): ../../conf/makedefs.out
+
+Makefile: Makefile.in
+	cat ../../conf/makedefs.out $? >$@
+
+test:	$(TESTPROG)
+
+tests:
+
+root_tests:
+
+update: ../../libexec/$(PROG)
+
+../../libexec/$(PROG): $(PROG)
+	cp $(PROG) ../../libexec
+
+printfck: $(OBJS) $(PROG)
+	rm -rf printfck
+	mkdir printfck
+	sed '1,/^# do not edit/!d' Makefile >printfck/Makefile
+	set -e; for i in *.c; do printfck -f .printfck $$i >printfck/$$i; done
+	cd printfck; make "INC_DIR=../../../include" `cd ..; ls *.o`
+
+lint:
+	lint $(DEFS) $(SRCS) $(LINTFIX)
+
+clean:
+	rm -f *.o *core $(PROG) $(TESTPROG) junk 
+	rm -rf printfck
+
+tidy:	clean
+
+depend: $(MAKES)
+	(sed '1,/^# do not edit/!d' Makefile.in; \
+	set -e; for i in [a-z][a-z0-9]*.c; do \
+	    $(CC) -E $(DEFS) $(INCL) $$i | grep -v '[<>]' | sed -n -e '/^# *1 *"\([^"]*\)".*/{' \
+	    -e 's//'`echo $$i|sed 's/c$$/o/'`': \1/' \
+	    -e 's/o: \.\//o: /' -e p -e '}' ; \
+	done | LANG=C sort -u) | grep -v '[.][o][:][ ][/]' >$$$$ && mv $$$$ Makefile.in
+	@$(EXPORT) make -f Makefile.in Makefile 1>&2
+
+# do not edit below this line - it is generated by 'make depend'
+pickup.o: ../../include/attr.h
+pickup.o: ../../include/check_arg.h
+pickup.o: ../../include/cleanup_user.h
+pickup.o: ../../include/htable.h
+pickup.o: ../../include/info_log_addr_form.h
+pickup.o: ../../include/input_transp.h
+pickup.o: ../../include/iostuff.h
+pickup.o: ../../include/lex_822.h
+pickup.o: ../../include/mail_conf.h
+pickup.o: ../../include/mail_date.h
+pickup.o: ../../include/mail_open_ok.h
+pickup.o: ../../include/mail_params.h
+pickup.o: ../../include/mail_proto.h
+pickup.o: ../../include/mail_queue.h
+pickup.o: ../../include/mail_server.h
+pickup.o: ../../include/mail_version.h
+pickup.o: ../../include/msg.h
+pickup.o: ../../include/mymalloc.h
+pickup.o: ../../include/nvtable.h
+pickup.o: ../../include/rec_attr_map.h
+pickup.o: ../../include/rec_type.h
+pickup.o: ../../include/record.h
+pickup.o: ../../include/safe_open.h
+pickup.o: ../../include/scan_dir.h
+pickup.o: ../../include/set_ugid.h
+pickup.o: ../../include/smtputf8.h
+pickup.o: ../../include/stringops.h
+pickup.o: ../../include/sys_defs.h
+pickup.o: ../../include/vbuf.h
+pickup.o: ../../include/vstream.h
+pickup.o: ../../include/vstring.h
+pickup.o: ../../include/watchdog.h
+pickup.o: pickup.c
diff --git a/src/pickup/pickup.c b/src/pickup/pickup.c
new file mode 100644
index 0000000..157970d
--- /dev/null
+++ b/src/pickup/pickup.c
@@ -0,0 +1,630 @@
+/*++
+/* NAME
+/*	pickup 8
+/* SUMMARY
+/*	Postfix local mail pickup
+/* SYNOPSIS
+/*	\fBpickup\fR [generic Postfix daemon options]
+/* DESCRIPTION
+/*	The \fBpickup\fR(8) daemon waits for hints that new mail has been
+/*	dropped into the \fBmaildrop\fR directory, and feeds it into the
+/*	\fBcleanup\fR(8) daemon.
+/*	Ill-formatted files are deleted without notifying the originator.
+/*	This program expects to be run from the \fBmaster\fR(8) process
+/*	manager.
+/* STANDARDS
+/* .ad
+/* .fi
+/*	None. The \fBpickup\fR(8) daemon does not interact with
+/*	the outside world.
+/* SECURITY
+/* .ad
+/* .fi
+/*	The \fBpickup\fR(8) daemon is moderately security sensitive. It runs
+/*	with fixed low privilege and can run in a chrooted environment.
+/*	However, the program reads files from potentially hostile users.
+/*	The \fBpickup\fR(8) daemon opens no files for writing, is careful about
+/*	what files it opens for reading, and does not actually touch any data
+/*	that is sent to its public service endpoint.
+/* DIAGNOSTICS
+/*	Problems and transactions are logged to \fBsyslogd\fR(8)
+/*	or \fBpostlogd\fR(8).
+/* BUGS
+/*	The \fBpickup\fR(8) daemon copies mail from file to the \fBcleanup\fR(8)
+/*	daemon.  It could avoid message copying overhead by sending a file
+/*	descriptor instead of file data, but then the already complex
+/*	\fBcleanup\fR(8) daemon would have to deal with unfiltered user data.
+/* CONFIGURATION PARAMETERS
+/* .ad
+/* .fi
+/*	As the \fBpickup\fR(8) daemon is a relatively long-running process, up
+/*	to an hour may pass before a \fBmain.cf\fR change takes effect.
+/*	Use the command "\fBpostfix reload\fR" command 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.
+/* 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 "\fBipc_timeout (3600s)\fR"
+/*	The time limit for sending or receiving information over an internal
+/*	communication channel.
+/* .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 "\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 "\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 3.3 and later:
+/* .IP "\fBservice_name (read-only)\fR"
+/*	The master.cf service name of a Postfix daemon process.
+/* .PP
+/*	Available in Postfix 3.5 and later:
+/* .IP "\fBinfo_log_address_format (external)\fR"
+/*	The email address form that will be used in non-debug logging
+/*	(info, warning, etc.).
+/* SEE ALSO
+/*	cleanup(8), message canonicalization
+/*	sendmail(1), Sendmail-compatible interface
+/*	postdrop(1), mail posting agent
+/*	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 <sys/stat.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <ctype.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <scan_dir.h>
+#include <vstring.h>
+#include <vstream.h>
+#include <set_ugid.h>
+#include <safe_open.h>
+#include <watchdog.h>
+#include <stringops.h>
+
+/* Global library. */
+
+#include <mail_queue.h>
+#include <mail_open_ok.h>
+#include <mymalloc.h>
+#include <mail_proto.h>
+#include <cleanup_user.h>
+#include <mail_date.h>
+#include <mail_params.h>
+#include <mail_conf.h>
+#include <record.h>
+#include <rec_type.h>
+#include <lex_822.h>
+#include <input_transp.h>
+#include <rec_attr_map.h>
+#include <mail_version.h>
+#include <smtputf8.h>
+#include <info_log_addr_form.h>
+
+/* Single-threaded server skeleton. */
+
+#include <mail_server.h>
+
+/* Application-specific. */
+
+char   *var_filter_xport;
+char   *var_input_transp;
+
+ /*
+  * Structure to bundle a bunch of information about a queue file.
+  */
+typedef struct {
+    char   *id;				/* queue file basename */
+    struct stat st;			/* queue file status */
+    char   *path;			/* name for open/remove */
+    char   *sender;			/* sender address */
+} PICKUP_INFO;
+
+ /*
+  * What action should be taken after attempting to deliver a message: remove
+  * the file from the maildrop, or leave it alone. The latter is also used
+  * for files that are still being written to.
+  */
+#define REMOVE_MESSAGE_FILE	1
+#define KEEP_MESSAGE_FILE	2
+
+ /*
+  * Transparency: before mail is queued, do we allow address mapping,
+  * automatic bcc, header/body checks?
+  */
+int     pickup_input_transp_mask;
+
+/* file_read_error - handle error while reading queue file */
+
+static int file_read_error(PICKUP_INFO *info, int type)
+{
+    msg_warn("uid=%ld: unexpected or malformed record type %d",
+	     (long) info->st.st_uid, type);
+    return (REMOVE_MESSAGE_FILE);
+}
+
+/* cleanup_service_error_reason - handle error writing to cleanup service. */
+
+static int cleanup_service_error_reason(PICKUP_INFO *info, int status,
+					        const char *reason)
+{
+
+    /*
+     * XXX If the cleanup server gave a reason, then it was already logged.
+     * Don't bother logging it another time.
+     * 
+     * XXX Discard a message without recipient. This can happen with "postsuper
+     * -r" when a message is already delivered (or bounced). The Postfix
+     * sendmail command rejects submissions without recipients.
+     */
+    if (reason == 0 || *reason == 0)
+	msg_warn("%s: error writing %s: %s",
+		 info->path, info->id, cleanup_strerror(status));
+    return ((status & (CLEANUP_STAT_BAD | CLEANUP_STAT_RCPT)) ?
+	    REMOVE_MESSAGE_FILE : KEEP_MESSAGE_FILE);
+}
+
+#define cleanup_service_error(info, status) \
+	cleanup_service_error_reason((info), (status), (char *) 0)
+
+/* copy_segment - copy a record group */
+
+static int copy_segment(VSTREAM *qfile, VSTREAM *cleanup, PICKUP_INFO *info,
+			        VSTRING *buf, char *expected)
+{
+    int     type;
+    int     check_first = (*expected == REC_TYPE_CONTENT[0]);
+    int     time_seen = 0;
+    char   *attr_name;
+    char   *attr_value;
+    char   *saved_attr;
+    int     skip_attr;
+
+    /*
+     * Limit the input record size. All front-end programs should protect the
+     * mail system against unreasonable inputs. This also requires that we
+     * limit the size of envelope records written by the local posting agent.
+     * 
+     * Records with named attributes are filtered by postdrop(1).
+     * 
+     * We must allow PTR records here because of "postsuper -r".
+     */
+    for (;;) {
+	if ((type = rec_get(qfile, buf, var_line_limit)) < 0
+	    || strchr(expected, type) == 0)
+	    return (file_read_error(info, type));
+	if (msg_verbose)
+	    msg_info("%s: read %c %s", info->id, type, vstring_str(buf));
+	if (type == *expected)
+	    break;
+	if (type == REC_TYPE_FROM) {
+	    if (info->sender == 0)
+		info->sender = mystrdup(vstring_str(buf));
+	    /* Compatibility with Postfix < 2.3. */
+	    if (time_seen == 0)
+		rec_fprintf(cleanup, REC_TYPE_TIME, "%ld",
+			    (long) info->st.st_mtime);
+	}
+	if (type == REC_TYPE_TIME)
+	    time_seen = 1;
+
+	/*
+	 * XXX Workaround: REC_TYPE_FILT (used in envelopes) == REC_TYPE_CONT
+	 * (used in message content).
+	 * 
+	 * As documented in postsuper(1), ignore content filter record.
+	 */
+	if (*expected != REC_TYPE_CONTENT[0]) {
+	    if (type == REC_TYPE_FILT)
+		/* Discard FILTER record after "postsuper -r". */
+		continue;
+	    if (type == REC_TYPE_RDR)
+		/* Discard REDIRECT record after "postsuper -r". */
+		continue;
+	}
+	if (*expected == REC_TYPE_EXTRACT[0]) {
+	    if (type == REC_TYPE_RRTO)
+		/* Discard return-receipt record after "postsuper -r". */
+		continue;
+	    if (type == REC_TYPE_ERTO)
+		/* Discard errors-to record after "postsuper -r". */
+		continue;
+	    if (type == REC_TYPE_ATTR) {
+		saved_attr = mystrdup(vstring_str(buf));
+		skip_attr = (split_nameval(saved_attr,
+					   &attr_name, &attr_value) == 0
+			     && rec_attr_map(attr_name) == 0);
+		myfree(saved_attr);
+		/* Discard other/header/body action after "postsuper -r". */
+		if (skip_attr)
+		    continue;
+	    }
+	}
+
+	/*
+	 * 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.
+	 */
+	if (check_first
+	    && (type == REC_TYPE_NORM || type == REC_TYPE_CONT)) {
+	    check_first = 0;
+	    if (VSTRING_LEN(buf) > 0 && IS_SPACE_TAB(vstring_str(buf)[0]))
+		rec_put(cleanup, REC_TYPE_NORM, "", 0);
+	}
+	if ((REC_PUT_BUF(cleanup, type, buf)) < 0)
+	    return (cleanup_service_error(info, CLEANUP_STAT_WRITE));
+    }
+    return (0);
+}
+
+/* pickup_copy - copy message to cleanup service */
+
+static int pickup_copy(VSTREAM *qfile, VSTREAM *cleanup,
+		               PICKUP_INFO *info, VSTRING *buf)
+{
+    time_t  now = time((time_t *) 0);
+    int     status;
+    char   *name;
+
+    /*
+     * Protect against time-warped time stamps. Warn about mail that has been
+     * queued for an excessive amount of time. Allow for some time drift with
+     * network clients that mount the maildrop remotely - especially clients
+     * that can't get their daylight savings offsets right.
+     */
+#define DAY_SECONDS 86400
+#define HOUR_SECONDS 3600
+
+    if (info->st.st_mtime > now + 2 * HOUR_SECONDS) {
+	msg_warn("%s: message dated %ld seconds into the future",
+		 info->id, (long) (info->st.st_mtime - now));
+	info->st.st_mtime = now;
+    } else if (info->st.st_mtime < now - DAY_SECONDS) {
+	msg_warn("%s: message has been queued for %d days",
+		 info->id, (int) ((now - info->st.st_mtime) / DAY_SECONDS));
+    }
+
+    /*
+     * Add content inspection transport. See also postsuper(1).
+     */
+    if (*var_filter_xport)
+	rec_fprintf(cleanup, REC_TYPE_FILT, "%s", var_filter_xport);
+
+    /*
+     * Copy the message envelope segment. Allow only those records that we
+     * expect to see in the envelope section. The envelope segment must
+     * contain an envelope sender address.
+     */
+    if ((status = copy_segment(qfile, cleanup, info, buf, REC_TYPE_ENVELOPE)) != 0)
+	return (status);
+    if (info->sender == 0) {
+	msg_warn("%s: uid=%ld: no envelope sender",
+		 info->id, (long) info->st.st_uid);
+	return (REMOVE_MESSAGE_FILE);
+    }
+
+    /*
+     * For messages belonging to $mail_owner also log the maildrop queue id.
+     * This supports message tracking for mail requeued via "postsuper -r".
+     */
+#define MAIL_IS_REQUEUED(info) \
+    ((info)->st.st_uid == var_owner_uid && ((info)->st.st_mode & S_IROTH) == 0)
+
+    if (MAIL_IS_REQUEUED(info)) {
+	msg_info("%s: uid=%d from=<%s> orig_id=%s", info->id,
+	     (int) info->st.st_uid, info_log_addr_form_sender(info->sender),
+		 ((name = strrchr(info->path, '/')) != 0 ?
+		  name + 1 : info->path));
+    } else {
+	msg_info("%s: uid=%d from=<%s>", info->id,
+	    (int) info->st.st_uid, info_log_addr_form_sender(info->sender));
+    }
+
+    /*
+     * Message content segment. Send a dummy message length. Prepend a
+     * Received: header to the message contents. For tracing purposes,
+     * include the message file ownership, without revealing the login name.
+     */
+    rec_fputs(cleanup, REC_TYPE_MESG, "");
+    rec_fprintf(cleanup, REC_TYPE_NORM, "Received: by %s (%s, from userid %ld)",
+		var_myhostname, var_mail_name, (long) info->st.st_uid);
+    rec_fprintf(cleanup, REC_TYPE_NORM, "\tid %s; %s", info->id,
+		mail_date(info->st.st_mtime));
+
+    /*
+     * Copy the message content segment. Allow only those records that we
+     * expect to see in the message content section.
+     */
+    if ((status = copy_segment(qfile, cleanup, info, buf, REC_TYPE_CONTENT)) != 0)
+	return (status);
+
+    /*
+     * Send the segment with information extracted from message headers.
+     * Permit a non-empty extracted segment, so that list manager software
+     * can to output recipients after the message, and so that sysadmins can
+     * re-inject messages after a change of configuration.
+     */
+    rec_fputs(cleanup, REC_TYPE_XTRA, "");
+    if ((status = copy_segment(qfile, cleanup, info, buf, REC_TYPE_EXTRACT)) != 0)
+	return (status);
+
+    /*
+     * There are no errors. Send the end-of-data marker, and get the cleanup
+     * service completion status. XXX Since the pickup service is unable to
+     * bounce, the cleanup service can report only soft errors here.
+     */
+    rec_fputs(cleanup, REC_TYPE_END, "");
+    if (attr_scan(cleanup, ATTR_FLAG_MISSING,
+		  RECV_ATTR_INT(MAIL_ATTR_STATUS, &status),
+		  RECV_ATTR_STR(MAIL_ATTR_WHY, buf),
+		  ATTR_TYPE_END) != 2)
+	return (cleanup_service_error(info, CLEANUP_STAT_WRITE));
+
+    /*
+     * Depending on the cleanup service completion status, delete the message
+     * file, or try again later. Bounces are dealt with by the cleanup
+     * service itself. The master process wakes up the cleanup service every
+     * now and then.
+     */
+    if (status) {
+	return (cleanup_service_error_reason(info, status, vstring_str(buf)));
+    } else {
+	return (REMOVE_MESSAGE_FILE);
+    }
+}
+
+/* pickup_file - initialize for file copy and cleanup */
+
+static int pickup_file(PICKUP_INFO *info)
+{
+    VSTRING *buf = vstring_alloc(100);
+    int     status;
+    VSTREAM *qfile;
+    VSTREAM *cleanup;
+    int     cleanup_flags;
+
+    /*
+     * Open the submitted file. If we cannot open it, and we're not having a
+     * file descriptor leak problem, delete the submitted file, so that we
+     * won't keep complaining about the same file again and again. XXX
+     * Perhaps we should save "bad" files elsewhere for further inspection.
+     * XXX How can we delete a file when open() fails with ENOENT?
+     */
+    qfile = safe_open(info->path, O_RDONLY | O_NONBLOCK, 0,
+		      (struct stat *) 0, -1, -1, buf);
+    if (qfile == 0) {
+	if (errno != ENOENT)
+	    msg_warn("open input file %s: %s", info->path, vstring_str(buf));
+	vstring_free(buf);
+	if (errno == EACCES)
+	    msg_warn("if this file was created by Postfix < 1.1, then you may have to chmod a+r %s/%s",
+		     var_queue_dir, info->path);
+	return (errno == EACCES ? KEEP_MESSAGE_FILE : REMOVE_MESSAGE_FILE);
+    }
+
+    /*
+     * Contact the cleanup service and read the queue ID that it has
+     * allocated. In case of trouble, request that the cleanup service
+     * bounces its copy of the message. because the original input file is
+     * not readable by the bounce service.
+     * 
+     * If mail is re-injected with "postsuper -r", disable Milter applications.
+     * If they were run before the mail was queued then there is no need to
+     * run them again. Moreover, the queue file does not contain enough
+     * information to reproduce the exact same SMTP events and Sendmail
+     * macros that Milters received when the mail originally arrived in
+     * Postfix.
+     * 
+     * The actual message copying code is in a separate routine, so that it is
+     * easier to implement the many possible error exits without forgetting
+     * to close files, or to release memory.
+     */
+    cleanup_flags =
+	input_transp_cleanup(CLEANUP_FLAG_BOUNCE | CLEANUP_FLAG_MASK_EXTERNAL,
+			     pickup_input_transp_mask);
+    /* As documented in postsuper(1). */
+    if (MAIL_IS_REQUEUED(info))
+	cleanup_flags &= ~CLEANUP_FLAG_MILTER;
+    else
+	cleanup_flags |= smtputf8_autodetect(MAIL_SRC_MASK_SENDMAIL);
+
+    cleanup = mail_connect_wait(MAIL_CLASS_PUBLIC, var_cleanup_service);
+    if (attr_scan(cleanup, ATTR_FLAG_STRICT,
+		  RECV_ATTR_STR(MAIL_ATTR_QUEUEID, buf),
+		  ATTR_TYPE_END) != 1
+	|| attr_print(cleanup, ATTR_FLAG_NONE,
+		      SEND_ATTR_INT(MAIL_ATTR_FLAGS, cleanup_flags),
+		      ATTR_TYPE_END) != 0) {
+	status = KEEP_MESSAGE_FILE;
+    } else {
+	info->id = mystrdup(vstring_str(buf));
+	status = pickup_copy(qfile, cleanup, info, buf);
+    }
+    vstream_fclose(qfile);
+    vstream_fclose(cleanup);
+    vstring_free(buf);
+    return (status);
+}
+
+/* pickup_init - init info structure */
+
+static void pickup_init(PICKUP_INFO *info)
+{
+    info->id = 0;
+    info->path = 0;
+    info->sender = 0;
+}
+
+/* pickup_free - wipe info structure */
+
+static void pickup_free(PICKUP_INFO *info)
+{
+#define SAFE_FREE(x) { if (x) myfree(x); }
+
+    SAFE_FREE(info->id);
+    SAFE_FREE(info->path);
+    SAFE_FREE(info->sender);
+}
+
+/* pickup_service - service client */
+
+static void pickup_service(char *unused_buf, ssize_t unused_len,
+			           char *unused_service, char **argv)
+{
+    SCAN_DIR *scan;
+    char   *queue_name;
+    PICKUP_INFO info;
+    const char *path;
+    char   *id;
+    int     file_count;
+
+    /*
+     * Sanity check. This service takes no command-line arguments.
+     */
+    if (argv[0])
+	msg_fatal("unexpected command-line argument: %s", argv[0]);
+
+    /*
+     * Skip over things that we don't want to open, such as files that are
+     * still being written, or garbage. Leave it up to the sysadmin to remove
+     * garbage. Keep scanning the queue directory until we stop removing
+     * files from it.
+     * 
+     * When we find a file, stroke the watchdog so that it will not bark while
+     * some application is keeping us busy by injecting lots of mail into the
+     * maildrop directory.
+     */
+    queue_name = MAIL_QUEUE_MAILDROP;		/* XXX should be a list */
+    do {
+	file_count = 0;
+	scan = scan_dir_open(queue_name);
+	while ((id = scan_dir_next(scan)) != 0) {
+	    if (mail_open_ok(queue_name, id, &info.st, &path) == MAIL_OPEN_YES) {
+		pickup_init(&info);
+		info.path = mystrdup(path);
+		watchdog_pat();
+		if (pickup_file(&info) == REMOVE_MESSAGE_FILE) {
+		    if (REMOVE(info.path))
+			msg_warn("remove %s: %m", info.path);
+		    else
+			file_count++;
+		}
+		pickup_free(&info);
+	    }
+	}
+	scan_dir_close(scan);
+    } while (file_count);
+}
+
+/* post_jail_init - drop privileges */
+
+static void post_jail_init(char *unused_name, char **unused_argv)
+{
+
+    /*
+     * In case master.cf was not updated for unprivileged service.
+     */
+    if (getuid() != var_owner_uid)
+	set_ugid(var_owner_uid, var_owner_gid);
+
+    /*
+     * Initialize the receive transparency options: do we want unknown
+     * recipient checks, do we want address mapping.
+     */
+    pickup_input_transp_mask =
+	input_transp_mask(VAR_INPUT_TRANSP, var_input_transp);
+}
+
+MAIL_VERSION_STAMP_DECLARE;
+
+/* main - pass control to the multi-threaded server skeleton */
+
+int     main(int argc, char **argv)
+{
+    static const CONFIG_STR_TABLE str_table[] = {
+	VAR_FILTER_XPORT, DEF_FILTER_XPORT, &var_filter_xport, 0, 0,
+	VAR_INPUT_TRANSP, DEF_INPUT_TRANSP, &var_input_transp, 0, 0,
+	0,
+    };
+
+    /*
+     * Fingerprint executables and core dumps.
+     */
+    MAIL_VERSION_STAMP_ALLOCATE;
+
+    /*
+     * Use the multi-threaded skeleton, because no-one else should be
+     * monitoring our service socket while this process runs.
+     * 
+     * XXX The default watchdog timeout for trigger servers is 1000s, while the
+     * cleanup server watchdog timeout is $daemon_timeout (i.e. several
+     * hours). We override the default 1000s timeout to avoid problems with
+     * slow mail submission. The real problem is of course that the
+     * single-threaded pickup server is not a good solution for mail
+     * submissions.
+     */
+    trigger_server_main(argc, argv, pickup_service,
+			CA_MAIL_SERVER_STR_TABLE(str_table),
+			CA_MAIL_SERVER_POST_INIT(post_jail_init),
+			CA_MAIL_SERVER_SOLITARY,
+			CA_MAIL_SERVER_WATCHDOG(&var_daemon_timeout),
+			0);
+}