Add smtp-delay: Introduce SMTP banner delays for qmail

This little number can be used to introduce smtp banner delays for
qmail. When run between tcpserver and rblsmtpd, it'll do a reverse
lookup of the connecting IP, compare that PTR to a regex, and then apply
long banner delays if there was no PTR or if the PTR matches the
"dialup" regex. The program depends on the fact that tcpserver will set
TCPREMOTEIP, and will take advantage of TCPREMOTEHOST if it's set. If
the client tries to pipeline (ram SMTP commands down our throat before
we show them an SMTP banner), RBLSMTPD is set, notifying rblsmtpd to
refuse their mail.

Author: schmonz

mail/smtp-delay/DESCR

@@ -0,0 +1,9 @@
+This little number can be used to introduce smtp banner delays for
+qmail. When run between tcpserver and rblsmtpd, it'll do a reverse
+lookup of the connecting IP, compare that PTR to a regex, and then apply
+long banner delays if there was no PTR or if the PTR matches the
+"dialup" regex. The program depends on the fact that tcpserver will set
+TCPREMOTEIP, and will take advantage of TCPREMOTEHOST if it's set. If
+the client tries to pipeline (ram SMTP commands down our throat before
+we show them an SMTP banner), RBLSMTPD is set, notifying rblsmtpd to
+refuse their mail.

mail/smtp-delay/Makefile

@@ -0,0 +1,26 @@
+# $NetBSD: Makefile,v 1.1 2023/12/05 17:36:16 schmonz Exp $
+
+DISTNAME=		smtp-delay
+PKGNAME=		${DISTNAME}-0.20
+CATEGORIES=		mail
+MASTER_SITES=		https://www.lewis.org/~jlewis/
+DIST_SUBDIR=		${PKGNAME_NOREV}
+EXTRACT_SUFX=		.c
+
+MAINTAINER=		schmonz@NetBSD.org
+HOMEPAGE=		https://www.lewis.org/~jlewis/smtp-delay/
+COMMENT=		Introduce SMTP banner delays for qmail
+LICENSE=		gnu-gpl-v2
+
+WRKSRC=			${WRKDIR}
+
+INSTALLATION_DIRS=	bin
+
+do-build:
+	cd ${WRKSRC};	\
+	${CC} ${CFLAGS} ${LDFLAGS} -o ${PKGBASE} ${PKGBASE}.c
+
+do-install:
+	${INSTALL_PROGRAM} ${WRKSRC}/${PKGBASE} ${DESTDIR}${PREFIX}/bin/
+
+.include "../../mk/bsd.pkg.mk"

mail/smtp-delay/PLIST

@@ -0,0 +1,2 @@
+@comment $NetBSD: PLIST,v 1.1 2023/12/05 17:36:16 schmonz Exp $
+bin/smtp-delay

mail/smtp-delay/distinfo

@@ -0,0 +1,5 @@
+$NetBSD: distinfo,v 1.1 2023/12/05 17:36:16 schmonz Exp $
+
+BLAKE2s (smtp-delay-0.20/smtp-delay.c) = 7e72d14cc3715e18caece85b2c47451e892a7547932ba8360f7d6e2fe991eaee
+SHA512 (smtp-delay-0.20/smtp-delay.c) = f8b9b0043f9eba7d68f693349a4c2f9c9bda9607cef1d6f24b7d0230410b0f499ad16922c9e81421271c234a6db3d5a4ff263a87c83b9e4a984e92f49aa5185d
+Size (smtp-delay-0.20/smtp-delay.c) = 14569 bytes