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/*++
/* NAME
/* bounce_notify_verp 3
/* SUMMARY
/* send non-delivery report to sender, server side
/* SYNOPSIS
/* #include "bounce_service.h"
/*
/* int bounce_notify_verp(flags, service, queue_name, queue_id,
/* encoding, smtputf8, sender,
/* dsn_envid, dsn_ret, verp_delims,
/* templates)
/* int flags;
/* char *service;
/* char *queue_name;
/* char *queue_id;
/* char *encoding;
/* int smtputf8;
/* char *sender;
/* char *dsn_envid;
/* int dsn_ret;
/* char *verp_delims;
/* BOUNCE_TEMPLATES *templates;
/* DESCRIPTION
/* This module implements the server side of the bounce_notify()
/* (send bounce message) request. The logfile
/* is removed after and a warning is posted.
/* The bounce recipient address is encoded in VERP format.
/* This routine must be used for single bounces only.
/*
/* When a message bounces, a full copy is sent to the originator,
/* and an optional copy of the diagnostics with message headers is
/* sent to the postmaster. The result is non-zero when the operation
/* should be tried again.
/*
/* When a bounce is sent, the sender address is the empty
/* address.
/* DIAGNOSTICS
/* Fatal error: error opening existing file.
/* SEE ALSO
/* bounce(3) basic bounce service client 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
/*--*/
/* System library. */
#include <sys_defs.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>
/* Utility library. */
#include <msg.h>
#include <vstream.h>
#include <name_mask.h>
#include <stringops.h>
/* Global library. */
#include <mail_params.h>
#include <mail_queue.h>
#include <post_mail.h>
#include <mail_addr.h>
#include <mail_error.h>
#include <verp_sender.h>
#include <bounce.h>
#include <dsn_mask.h>
#include <rec_type.h>
/* Application-specific. */
#include "bounce_service.h"
#define STR vstring_str
/* bounce_notify_verp - send a bounce, VERP style */
int bounce_notify_verp(int flags, char *service, char *queue_name,
char *queue_id, char *encoding,
int smtputf8, char *recipient,
char *dsn_envid, int dsn_ret,
char *verp_delims, BOUNCE_TEMPLATES *ts)
{
const char *myname = "bounce_notify_verp";
BOUNCE_INFO *bounce_info;
int bounce_status = 0;
int postmaster_status;
VSTREAM *bounce;
int notify_mask = name_mask(VAR_NOTIFY_CLASSES, mail_error_masks,
var_notify_classes);
char *postmaster;
VSTRING *verp_buf;
VSTRING *new_id;
/*
* Sanity checks. We must be called only for undeliverable non-bounce
* messages.
*/
if (*recipient == 0)
msg_panic("%s: attempt to bounce a single bounce", myname);
if (strcasecmp_utf8(recipient, mail_addr_double_bounce()) == 0)
msg_panic("%s: attempt to bounce a double bounce", myname);
/*
* Initialize. Open queue file, bounce log, etc.
*/
bounce_info = bounce_mail_init(service, queue_name, queue_id,
encoding, smtputf8, dsn_envid,
ts->failure);
/*
* If we have no recipient list then we can't send VERP replies. Send
* *something* anyway so that the mail is not lost in a black hole.
*/
if (bounce_info->log_handle == 0) {
DSN_BUF *dsn_buf = dsb_create();
RCPT_BUF *rcpt_buf = rcpb_create();
dsb_simple(dsn_buf, "5.0.0", "(error report unavailable)");
(void) DSN_FROM_DSN_BUF(dsn_buf);
vstring_strcpy(rcpt_buf->address, "(recipient address unavailable)");
(void) RECIPIENT_FROM_RCPT_BUF(rcpt_buf);
bounce_status = bounce_one_service(flags, queue_name, queue_id,
encoding, smtputf8, recipient,
dsn_envid, dsn_ret, rcpt_buf,
dsn_buf, ts);
rcpb_free(rcpt_buf);
dsb_free(dsn_buf);
bounce_mail_free(bounce_info);
return (bounce_status);
}
#define NULL_SENDER MAIL_ADDR_EMPTY /* special address */
#define NULL_TRACE_FLAGS 0
/*
* A non-bounce message was returned. Send a single bounce, one per
* recipient.
*/
verp_buf = vstring_alloc(100);
new_id = vstring_alloc(10);
while (bounce_log_read(bounce_info->log_handle, bounce_info->rcpt_buf,
bounce_info->dsn_buf) != 0) {
RECIPIENT *rcpt = &bounce_info->rcpt_buf->rcpt;
/*
* Notify the originator, subject to DSN NOTIFY restrictions.
*
* Fix 20090114: Use the Postfix original recipient, because that is
* what the VERP consumer expects.
*/
if (rcpt->dsn_notify != 0 /* compat */
&& (rcpt->dsn_notify & DSN_NOTIFY_FAILURE) == 0) {
bounce_status = 0;
} else {
verp_sender(verp_buf, verp_delims, recipient, rcpt);
if ((bounce = post_mail_fopen_nowait(NULL_SENDER, STR(verp_buf),
MAIL_SRC_MASK_BOUNCE,
NULL_TRACE_FLAGS,
smtputf8,
new_id)) != 0) {
/*
* Send the bounce message header, some boilerplate text that
* pretends that we are a polite mail system, the text with
* reason for the bounce, and a copy of the original message.
*/
if (bounce_header(bounce, bounce_info, STR(verp_buf),
NO_POSTMASTER_COPY) == 0
&& bounce_boilerplate(bounce, bounce_info) == 0
&& bounce_recipient_log(bounce, bounce_info) == 0
&& bounce_header_dsn(bounce, bounce_info) == 0
&& bounce_recipient_dsn(bounce, bounce_info) == 0)
bounce_original(bounce, bounce_info, dsn_ret ?
dsn_ret : DSN_RET_FULL);
bounce_status = post_mail_fclose(bounce);
if (bounce_status == 0)
msg_info("%s: sender non-delivery notification: %s",
queue_id, STR(new_id));
} else
bounce_status = 1;
/*
* Stop at the first sign of trouble, instead of making the
* problem worse.
*/
if (bounce_status != 0)
break;
/*
* Optionally, mark this recipient as done.
*/
if (flags & BOUNCE_FLAG_DELRCPT)
bounce_delrcpt_one(bounce_info);
}
/*
* Optionally, send a postmaster notice, subject to notify_classes
* restrictions.
*
* This postmaster notice is not critical, so if it fails don't
* retransmit the bounce that we just generated, just log a warning.
*/
#define SEND_POSTMASTER_SINGLE_BOUNCE_NOTICE (notify_mask & MAIL_ERROR_BOUNCE)
if (SEND_POSTMASTER_SINGLE_BOUNCE_NOTICE) {
/*
* Send the text with reason for the bounce, and the headers of
* the original message. Don't bother sending the boiler-plate
* text. This postmaster notice is not critical, so if it fails
* don't retransmit the bounce that we just generated, just log a
* warning.
*/
postmaster = var_bounce_rcpt;
if ((bounce = post_mail_fopen_nowait(mail_addr_double_bounce(),
postmaster,
MAIL_SRC_MASK_BOUNCE,
NULL_TRACE_FLAGS,
smtputf8,
new_id)) != 0) {
if (bounce_header(bounce, bounce_info, postmaster,
POSTMASTER_COPY) == 0
&& bounce_recipient_log(bounce, bounce_info) == 0
&& bounce_header_dsn(bounce, bounce_info) == 0
&& bounce_recipient_dsn(bounce, bounce_info) == 0)
bounce_original(bounce, bounce_info, DSN_RET_HDRS);
postmaster_status = post_mail_fclose(bounce);
if (postmaster_status == 0)
msg_info("%s: postmaster non-delivery notification: %s",
queue_id, STR(new_id));
} else
postmaster_status = 1;
if (postmaster_status)
msg_warn("%s: postmaster notice failed while bouncing to %s",
queue_id, recipient);
}
}
/*
* Examine the completion status. Delete the bounce log file only when
* the bounce was posted successfully, and only if we are bouncing for
* real, not just warning.
*/
if (bounce_status == 0 && mail_queue_remove(service, queue_id)
&& errno != ENOENT)
msg_fatal("remove %s %s: %m", service, queue_id);
/*
* Cleanup.
*/
bounce_mail_free(bounce_info);
vstring_free(verp_buf);
vstring_free(new_id);
return (bounce_status);
}
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