Adding upstream version 3.4.23.upstream/3.4.23upstream

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

1 files changed, 266 insertions, 0 deletions

diff --git a/src/bounce/bounce_one_service.c b/src/bounce/bounce_one_service.c
new file mode 100644
index 0000000..29c4fc3
--- /dev/null
+++ b/src/bounce/bounce_one_service.c
@@ -0,0 +1,266 @@
+/*++
+/* NAME
+/*	bounce_one_service 3
+/* SUMMARY
+/*	send non-delivery report to sender, server side
+/* SYNOPSIS
+/*	#include "bounce_service.h"
+/*
+/*	int     bounce_one_service(flags, queue_name, queue_id, encoding,
+/*					smtputf8, orig_sender, envid, ret,
+/*					rcpt_buf, dsn_buf, templates)
+/*	int	flags;
+/*	char	*queue_name;
+/*	char	*queue_id;
+/*	char	*encoding;
+/*	int	smtputf8;
+/*	char	*orig_sender;
+/*	char	*envid;
+/*	int	ret;
+/*	RCPT_BUF *rcpt_buf;
+/*	DSN_BUF	*dsn_buf;
+/*	BOUNCE_TEMPLATES *templates;
+/* DESCRIPTION
+/*	This module implements the server side of the bounce_one()
+/*	(send bounce message for one recipient) request.
+/*
+/*	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.  When a bounce bounces, an optional double bounce
+/*	with the entire undeliverable mail is sent to the postmaster,
+/*	with as sender address the double bounce address.
+/* DIAGNOSTICS
+/*	Fatal error: error opening existing file.
+/* BUGS
+/* 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 <post_mail.h>
+#include <mail_addr.h>
+#include <mail_error.h>
+#include <bounce.h>
+#include <dsn_mask.h>
+#include <rec_type.h>
+
+/* Application-specific. */
+
+#include "bounce_service.h"
+
+#define STR vstring_str
+
+/* bounce_one_service - send a bounce for one recipient */
+
+int     bounce_one_service(int flags, char *queue_name, char *queue_id,
+			           char *encoding, int smtputf8,
+			           char *orig_sender, char *dsn_envid,
+			           int dsn_ret, RCPT_BUF *rcpt_buf,
+			           DSN_BUF *dsn_buf, BOUNCE_TEMPLATES *ts)
+{
+    BOUNCE_INFO *bounce_info;
+    int     bounce_status = 1;
+    int     postmaster_status = 1;
+    VSTREAM *bounce;
+    int     notify_mask = name_mask(VAR_NOTIFY_CLASSES, mail_error_masks,
+				    var_notify_classes);
+    VSTRING *new_id = vstring_alloc(10);
+
+    /*
+     * Initialize. Open queue file, bounce log, etc.
+     */
+    bounce_info = bounce_mail_one_init(queue_name, queue_id, encoding,
+				       smtputf8, dsn_envid, rcpt_buf,
+				       dsn_buf, ts->failure);
+
+#define NULL_SENDER		MAIL_ADDR_EMPTY	/* special address */
+#define NULL_TRACE_FLAGS	0
+
+    /*
+     * The choice of bounce sender address depends on the original sender
+     * address. For a single bounce (a non-delivery notification to the
+     * message originator), the sender address is the empty string. For a
+     * double bounce (typically a failed single bounce, or a postmaster
+     * notification that was produced by any of the mail processes) the
+     * sender address is defined by the var_double_bounce_sender
+     * configuration variable. When a double bounce cannot be delivered, the
+     * queue manager blackholes the resulting triple bounce message.
+     */
+
+    /*
+     * Double bounce failed. Never send a triple bounce.
+     * 
+     * However, this does not prevent double bounces from bouncing on other
+     * systems. In order to cope with this, either the queue manager must
+     * recognize the double-bounce original sender address and discard mail,
+     * or every delivery agent must recognize the double-bounce sender
+     * address and substitute something else so mail does not come back at
+     * us.
+     */
+    if (strcasecmp_utf8(orig_sender, mail_addr_double_bounce()) == 0) {
+	msg_warn("%s: undeliverable postmaster notification discarded",
+		 queue_id);
+	bounce_status = 0;
+    }
+
+    /*
+     * Single bounce failed. Optionally send a double bounce to postmaster,
+     * subject to notify_classes restrictions.
+     */
+#define ANY_BOUNCE (MAIL_ERROR_2BOUNCE | MAIL_ERROR_BOUNCE)
+#define SEND_POSTMASTER_ANY_BOUNCE_NOTICE (notify_mask & ANY_BOUNCE)
+
+    else if (*orig_sender == 0) {
+	if (!SEND_POSTMASTER_ANY_BOUNCE_NOTICE) {
+	    bounce_status = 0;
+	} else {
+	    if ((bounce = post_mail_fopen_nowait(mail_addr_double_bounce(),
+						 var_2bounce_rcpt,
+						 MAIL_SRC_MASK_BOUNCE,
+						 NULL_TRACE_FLAGS,
+						 smtputf8,
+						 new_id)) != 0) {
+
+		/*
+		 * Double bounce to Postmaster. This is the last opportunity
+		 * for this message to be delivered. Send the text with
+		 * reason for the bounce, and the headers of the original
+		 * message. Don't bother sending the boiler-plate text.
+		 */
+		if (!bounce_header(bounce, bounce_info, var_2bounce_rcpt,
+				   POSTMASTER_COPY)
+		    && 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_FULL);
+		bounce_status = post_mail_fclose(bounce);
+		if (bounce_status == 0)
+		    msg_info("%s: postmaster non-delivery notification: %s",
+			     queue_id, STR(new_id));
+	    }
+	}
+    }
+
+    /*
+     * Non-bounce failed. Send a single bounce, subject to DSN NOTIFY
+     * restrictions.
+     */
+    else {
+	RECIPIENT *rcpt = &bounce_info->rcpt_buf->rcpt;
+
+	if (rcpt->dsn_notify != 0		/* compat */
+	    && (rcpt->dsn_notify & DSN_NOTIFY_FAILURE) == 0) {
+	    bounce_status = 0;
+	} else {
+	    if ((bounce = post_mail_fopen_nowait(NULL_SENDER, orig_sender,
+						 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, orig_sender,
+				  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));
+	    }
+	}
+
+	/*
+	 * 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 (bounce_status == 0 && SEND_POSTMASTER_SINGLE_BOUNCE_NOTICE
+	    && strcasecmp_utf8(orig_sender, mail_addr_double_bounce()) != 0) {
+
+	    /*
+	     * 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.
+	     */
+	    if ((bounce = post_mail_fopen_nowait(mail_addr_double_bounce(),
+						 var_bounce_rcpt,
+						 MAIL_SRC_MASK_BOUNCE,
+						 NULL_TRACE_FLAGS,
+						 smtputf8,
+						 new_id)) != 0) {
+		if (bounce_header(bounce, bounce_info, var_bounce_rcpt,
+				  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));
+	    }
+	    if (postmaster_status)
+		msg_warn("%s: postmaster notice failed while bouncing to %s",
+			 queue_id, orig_sender);
+	}
+    }
+
+    /*
+     * Optionally, delete the recipient from the queue file.
+     */
+    if (bounce_status == 0 && (flags & BOUNCE_FLAG_DELRCPT))
+	bounce_delrcpt_one(bounce_info);
+
+    /*
+     * Cleanup.
+     */
+    bounce_mail_free(bounce_info);
+    vstring_free(new_id);
+
+    return (bounce_status);
+}