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/*++
/* NAME
/* error 8
/* SUMMARY
/* Postfix error mailer
/* SYNOPSIS
/* \fBerror\fR [generic Postfix daemon options]
/* DESCRIPTION
/* The Postfix error mailer processes message delivery requests from
/* the queue manager. Each request specifies a queue file, a sender
/* address, a domain or host name that is treated as the reason for
/* non-delivery, and recipient information.
/* This program expects to be run from the \fBmaster\fR(8) process
/* manager.
/*
/* The error mailer client forces all recipients to bounce, using the
/* domain or host information as the reason for non-delivery, updates
/* the queue file and marks recipients as finished, or it informs the
/* queue manager that delivery should be tried again at a later time.
/*
/* Delivery problem reports are sent to the \fBbounce\fR(8) or
/* \fBdefer\fR(8) daemon as appropriate.
/* SECURITY
/* .ad
/* .fi
/* The error mailer is not security-sensitive. It does not talk
/* to the network, and can be run chrooted at fixed low privilege.
/* STANDARDS
/* None.
/* DIAGNOSTICS
/* Problems and transactions are logged to \fBsyslogd\fR(8).
/*
/* Depending on the setting of the \fBnotify_classes\fR parameter,
/* the postmaster is notified of bounces and of other trouble.
/* BUGS
/* CONFIGURATION PARAMETERS
/* .ad
/* .fi
/* The following \fBmain.cf\fR parameters are especially relevant to
/* this program. See the Postfix \fBmain.cf\fR file for syntax details
/* and for default values. Use the \fBpostfix reload\fR command after
/* a configuration change.
/* .SH Miscellaneous
/* .ad
/* .fi
/* .IP \fBbounce_notice_recipient\fR
/* Postmaster for bounce error notices.
/* .IP \fBnotify_classes\fR
/* When this parameter includes the \fBbounce\fR class, send mail to the
/* postmaster with with the headers of the bounced mail.
/* SEE ALSO
/* bounce(8) non-delivery status reports
/* master(8) process manager
/* qmgr(8) queue manager
/* 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
/*--*/
/* System library. */
#include <sys_defs.h>
#include <unistd.h>
#include <stdlib.h>
/* Utility library. */
#include <msg.h>
#include <vstream.h>
/* Global library. */
#include <deliver_request.h>
#include <mail_queue.h>
#include <bounce.h>
#include <deliver_completed.h>
/* Single server skeleton. */
#include <mail_server.h>
/* deliver_message - deliver message with extreme prejudice */
static int deliver_message(DELIVER_REQUEST *request)
{
char *myname = "deliver_message";
VSTREAM *src;
int result = 0;
int status;
RECIPIENT *rcpt;
int nrcpt;
if (msg_verbose)
msg_info("deliver_message: from %s", request->sender);
/*
* Sanity checks.
*/
if (request->nexthop[0] == 0)
msg_fatal("empty nexthop hostname");
if (request->rcpt_list.len <= 0)
msg_fatal("recipient count: %d", request->rcpt_list.len);
/*
* Open the queue file. Opening the file can fail for a variety of
* reasons, such as the system running out of resources. Instead of
* throwing away mail, we're raising a fatal error which forces the mail
* system to back off, and retry later.
*/
src = mail_queue_open(request->queue_name, request->queue_id,
O_RDWR, 0);
if (src == 0)
msg_fatal("%s: open %s %s: %m", myname,
request->queue_name, request->queue_id);
if (msg_verbose)
msg_info("%s: file %s", myname, VSTREAM_PATH(src));
/*
* Bounce all recipients.
*/
for (nrcpt = 0; nrcpt < request->rcpt_list.len; nrcpt++) {
rcpt = request->rcpt_list.info + nrcpt;
if (rcpt->offset >= 0) {
status = bounce_append(BOUNCE_FLAG_KEEP, request->queue_id,
rcpt->address, "error",
request->arrival_time,
"%s", request->nexthop);
if (status == 0)
deliver_completed(src, rcpt->offset);
result |= status;
}
}
/*
* Clean up.
*/
if (vstream_fclose(src))
msg_warn("close %s %s: %m", request->queue_name, request->queue_id);
return (result);
}
/* error_service - perform service for client */
static void error_service(VSTREAM *client_stream, char *unused_service, char **argv)
{
DELIVER_REQUEST *request;
int status;
/*
* Sanity check. This service takes no command-line arguments.
*/
if (argv[0])
msg_fatal("unexpected command-line argument: %s", argv[0]);
/*
* This routine runs whenever a client connects to the UNIX-domain socket
* dedicated to the error mailer. What we see below is a little protocol
* to (1) tell the queue manager that we are ready, (2) read a request
* from the queue manager, and (3) report the completion status of that
* request. All connection-management stuff is handled by the common code
* in single_server.c.
*/
if ((request = deliver_request_read(client_stream)) != 0) {
status = deliver_message(request);
deliver_request_done(client_stream, request, status);
}
}
/* main - pass control to the single-threaded skeleton */
int main(int argc, char **argv)
{
single_server_main(argc, argv, error_service, 0);
}
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