Add support for DSN and Enhanced Status Code

1 files changed, 137 insertions, 0 deletions

diff --git a/usr.sbin/smtpd/esc.c b/usr.sbin/smtpd/esc.c
new file mode 100644
index 00000000000..7bccc22d9ab
--- /dev/null
+++ b/usr.sbin/smtpd/esc.c
@@ -0,0 +1,137 @@
+/* $OpenBSD: esc.c,v 1.1 2014/02/04 15:44:05 eric Exp $	 */
+
+/*
+ * Copyright (c) 2014 Gilles Chehade <gilles@poolp.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <stdio.h>
+
+#include "smtpd-defines.h"
+#include "smtpd-api.h"
+
+static struct escode {
+	enum enhanced_status_code	code;
+	const char		       *description;
+} esc[] = {
+	/* 0.0 */
+	{ ESC_OTHER_STATUS,				"Other/Undefined" },
+
+	/* 1.x */
+	{ ESC_OTHER_ADDRESS_STATUS,			"Other/Undefined address status" },
+	{ ESC_BAD_DESTINATION_MAILBOX_ADDRESS,		"Bad destination mailbox address" },
+	{ ESC_BAD_DESTINATION_SYSTEM_ADDRESS,		"Bad destination system address" },
+	{ ESC_BAD_DESTINATION_MAILBOX_ADDRESS_SYNTAX,	"Bad destination mailbox address syntax" },
+	{ ESC_DESTINATION_MAILBOX_ADDRESS_AMBIGUOUS,	"Destination mailbox address ambiguous" },
+	{ ESC_DESTINATION_ADDRESS_VALID,		"Destination address valid" },
+	{ ESC_DESTINATION_MAILBOX_HAS_MOVED,		"Destination mailbox has moved, No forwarding address" },
+	{ ESC_BAD_SENDER_MAILBOX_ADDRESS_SYNTAX,	"Bad sender's mailbox address syntax" },
+	{ ESC_BAD_SENDER_SYSTEM_ADDRESS,		"Bad sender's system address syntax" },
+
+	/* 2.x */
+	{ ESC_OTHER_MAILBOX_STATUS,			"Other/Undefined mailbox status" },
+	{ ESC_MAILBOX_DISABLED,				"Mailbox disabled, not accepting messages" },
+	{ ESC_MAILBOX_FULL,				"Mailbox full" },
+	{ ESC_MESSAGE_LENGTH_TOO_LARGE,			"Message length exceeds administrative limit" },
+	{ ESC_MAILING_LIST_EXPANSION_PROBLEM,		"Mailing list expansion problem" },
+
+	/* 3.x */
+	{ ESC_OTHER_MAIL_SYSTEM_STATUS,			"Other/Undefined mail system status" },
+	{ ESC_MAIL_SYSTEM_FULL,				"Mail system full" },
+	{ ESC_SYSTEM_NOT_ACCEPTING_MESSAGES,		"System not accepting network messages" },
+	{ ESC_SYSTEM_NOT_CAPABLE_OF_SELECTED_FEATURES,	"System not capable of selected features" },
+	{ ESC_MESSAGE_TOO_BIG_FOR_SYSTEM,		"Message too big for system" },
+	{ ESC_SYSTEM_INCORRECTLY_CONFIGURED,		"System incorrectly configured" },
+
+	/* 4.x */
+	{ ESC_OTHER_NETWORK_ROUTING_STATUS,		"Other/Undefined network or routing status" },
+	{ ESC_NO_ANSWER_FROM_HOST,			"No answer from host" },
+	{ ESC_BAD_CONNECTION,				"Bad connection" },
+	{ ESC_DIRECTORY_SERVER_FAILURE,			"Directory server failure" },
+	{ ESC_UNABLE_TO_ROUTE,				"Unable to route" },
+	{ ESC_MAIL_SYSTEM_CONGESTION,			"Mail system congestion" },
+	{ ESC_ROUTING_LOOP_DETECTED,			"Routing loop detected" },
+	{ ESC_DELIVERY_TIME_EXPIRED,			"Delivery time expired" },
+
+	/* 5.x */
+	{ ESC_OTHER_PROTOCOL_STATUS,			"Other/Undefined protocol status" },
+	{ ESC_INVALID_COMMAND,				"Invalid command" },
+	{ ESC_SYNTAX_ERROR,				"Syntax error" },
+	{ ESC_TOO_MANY_RECIPIENTS,			"Too many recipients" },
+	{ ESC_INVALID_COMMAND_ARGUMENTS,		"Invalid command arguments" },
+	{ ESC_WRONG_PROTOCOL_VERSION,			"Wrong protocol version" },
+
+	/* 6.x */
+	{ ESC_OTHER_MEDIA_ERROR,			"Other/Undefined media error" },
+	{ ESC_MEDIA_NOT_SUPPORTED,			"Media not supported" },
+	{ ESC_CONVERSION_REQUIRED_AND_PROHIBITED,	"Conversion required and prohibited" },
+	{ ESC_CONVERSION_REQUIRED_BUT_NOT_SUPPORTED,	"Conversion required but not supported" },
+	{ ESC_CONVERSION_WITH_LOSS_PERFORMED,		"Conversion with loss performed" },
+	{ ESC_CONVERSION_FAILED,			"Conversion failed" },
+
+	/* 7.x */
+	{ ESC_OTHER_SECURITY_STATUS,			"Other/Undefined security status" },
+	{ ESC_DELIVERY_NOT_AUTHORIZED_MESSAGE_REFUSED,	"Delivery not authorized, message refused" },
+	{ ESC_MAILING_LIST_EXPANSION_PROHIBITED,       	"Mailing list expansion prohibited" },
+	{ ESC_SECURITY_CONVERSION_REQUIRED_NOT_POSSIBLE,"Security conversion required but not possible" },
+	{ ESC_SECURITY_FEATURES_NOT_SUPPORTED,		"Security features not supported" },
+	{ ESC_CRYPTOGRAPHIC_FAILURE,			"Cryptographic failure" },
+	{ ESC_CRYPTOGRAPHIC_ALGORITHM_NOT_SUPPORTED,	"Cryptographic algorithm not supported" },
+	{ ESC_MESSAGE_TOO_BIG_FOR_SYSTEM,		"Message integrity failure" },
+};
+
+#if 0
+struct esc_map {
+	uint8_t		code;
+	const char     *description;
+};
+
+static struct esc_map esc_class[] = {
+	{ 2, "Success" },
+	{ 4, "Persistent Transient Failure"},
+	{ 5, "Permanent Failure" },
+};
+
+static struct esc_map esc_subclass[] = {
+	{ 0, "Other/Undefined" },
+	{ 1, "Addressing Status" },
+	{ 2, "Mailbox Status" },
+	{ 3, "Mail System Status" },
+	{ 4, "Network and Routing Status" },
+	{ 5, "Mail Delivery Protocol Status" },
+	{ 6, "Message Content or Media Status" },
+	{ 7, "Security or Policy Status" },
+};
+#endif
+
+const char *
+esc_code(enum enhanced_status_class class, enum enhanced_status_code code)
+{
+	static char buffer[6];
+
+	snprintf(buffer, sizeof buffer, "%d.%d.%d", class, code / 10, code % 10);
+	return buffer;
+
+}
+
+const char *
+esc_description(enum enhanced_status_code code)
+{
+	uint32_t	i;
+
+	for (i = 0; i < nitems(esc); ++i)
+		if (code == esc[i].code)
+			return esc[i].description;
+	return "Other/Undefined";
+}