bmf-milter

bmf filter milter daemon
git clone git://r-36.net/bmf-milter
Log | Files | Refs | LICENSE
commit 06400a9712153d0754991be7db48715a72da510c
Author: Christoph Lohmann <20h@r-36.net>
Date:   Sat, 13 Jun 2020 21:16:08 +0200

Initial commit.

Diffstat:

LICENSE | 676+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


Makefile | 52++++++++++++++++++++++++++++++++++++++++++++++++++++


arg.h | 46++++++++++++++++++++++++++++++++++++++++++++++


bmf-milter | 0


bmf-milter.c | 310+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


bmf-milter.o | 0


6 files changed, 1084 insertions(+), 0 deletions(-)

diff --git a/LICENSE b/LICENSE
@@ -0,0 +1,676 @@
+© 2020 Christoph Lohmann <20h at r-36 dot net>
+
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+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/Makefile b/Makefile
@@ -0,0 +1,52 @@
+# bmf-milter - milter daemon for bmf
+# See LICENSE file for copyright and license details.
+.POSIX:
+
+NAME = bmf-milter
+VERSION = 0.5
+
+PREFIX = /usr/local
+BINDIR = ${PREFIX}/sbin
+MANDIR = ${PREFIX}/share/man/man8
+
+BMFMILTER_CFLAGS = -D_DEFAULT_SOURCE -D_POSIX_C_SOURCE=200809L -I. -I/usr/include ${CFLAGS}
+BMFMILTER_LDFLAGS = -L/usr/lib -L. -lmilter ${LDFLAGS}
+
+SRC = bmf-milter.c
+OBJ = ${SRC:.c=.o}
+
+all: ${NAME}
+
+.c.o:
+	${CC} ${BMFMILTER_CFLAGS} -c $<
+
+${OBJ}:
+
+${NAME}: ${OBJ}
+	${CC} -o $@ ${OBJ} ${BMFMILTER_LDFLAGS}
+
+clean:
+	rm -f ${NAME} ${OBJ} ${NAME}-${VERSION}.tar.gz
+
+install: all
+	mkdir -p "${DESTDIR}${BINDIR}"
+	cp -f ${NAME} "${DESTDIR}${BINDIR}"
+	chmod 755 "${DESTDIR}${BINDIR}/${NAME}"
+	mkdir -p "${DESTDIR}${MANDIR}"
+	#cp -f ${NAME}.8 "${DESTDIR}${MANDIR}"
+	#chmod 644 "${DESTDIR}${MANDIR}/${NAME}.8"
+
+uninstall:
+	rm -f "${DESTDIR}${BINDIR}/${NAME}"
+	#rm -f "${DESTDIR}${MANDIR}/${NAME}.8"
+
+dist: clean
+	mkdir -p ${NAME}-${VERSION}
+	cp -R README LICENSE Makefile ${NAME}.8 \
+	       	*.c *.h ${NAME}-${VERSION}
+	tar -cf ${NAME}-${VERSION}.tar ${NAME}-${VERSION}
+	gzip ${NAME}-${VERSION}.tar
+	mv ${NAME}-${VERSION}.tar.gz ${NAME}-${VERSION}.tgz
+	rm -rf "${NAME}-${VERSION}"
+
+.PHONY: all clean dist install uninstall
diff --git a/arg.h b/arg.h
@@ -0,0 +1,46 @@
+/*
+ * Copy me if you can.
+ * by 20h
+ */
+
+#ifndef ARG_H__
+#define ARG_H__
+
+/* use main(int argc, char *argv[]) */
+#define ARGBEGIN(ARGV0)	for (ARGV0 = *argv, argv++, argc--;\
+					argv[0] && argv[0][0] == '-'\
+					&& argv[0][1];\
+					argc--, argv++) {\
+				char argc_;\
+				char **argv_;\
+				int brk_;\
+				if (argv[0][1] == '-' && argv[0][2] == '\0') {\
+					argv++;\
+					argc--;\
+					break;\
+				}\
+				for (brk_ = 0, argv[0]++, argv_ = argv;\
+						argv[0][0] && !brk_;\
+						argv[0]++) {\
+					if (argv_ != argv)\
+						break;\
+					argc_ = argv[0][0];\
+					switch (argc_)
+#define ARGEND			}\
+			}
+
+#define ARGC()		argc_
+
+#define EARGF(x)	((argv[0][1] == '\0' && argv[1] == NULL)?\
+				((x), abort(), (char *)0) :\
+				(brk_ = 1, (argv[0][1] != '\0')?\
+					(&argv[0][1]) :\
+					(argc--, argv++, argv[0])))
+
+#define ARGF()		((argv[0][1] == '\0' && argv[1] == NULL)?\
+				(char *)0 :\
+				(brk_ = 1, (argv[0][1] != '\0')?\
+					(&argv[0][1]) :\
+					(argc--, argv++, argv[0])))
+
+#endif
diff --git a/bmf-milter b/bmf-milter
Binary files differ.
diff --git a/bmf-milter.c b/bmf-milter.c
@@ -0,0 +1,310 @@
+/*
+ * Copy me if you can.
+ * by 20h
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <sysexits.h>
+#include <unistd.h>
+#include <signal.h>
+
+#include "libmilter/mfapi.h"
+
+#include "arg.h"
+
+struct Priv
+{
+	/* read from execpipe[0], write to execpipe[1] */
+	int	execpipe[2];
+	int	execpid;
+};
+
+#define MLFIPRIV ((struct Priv *) smfi_getpriv(ctx))
+
+extern sfsistat	mlfi_cleanup(SMFICTX *);
+
+sfsistat
+mlfi_connect(SMFICTX *ctx, char *hostname, _SOCK_ADDR *hostaddr)
+{
+	struct Priv *priv;
+	char *ident;
+	int pid;
+
+	printf("mlfi_connect(%s)\n", hostname);
+
+	priv = malloc(sizeof *priv);
+	if (priv == NULL)
+		return SMFIS_TEMPFAIL;
+	memset(priv, '\0', sizeof *priv);
+
+	smfi_setpriv(ctx, priv);
+
+	if (pipe(priv->execpipe) < 0) {
+		free(priv);
+		smfi_setpriv(ctx, NULL);
+		return SMFIS_TEMPFAIL;
+	}
+
+	switch((pid = fork())) {
+	case 0:
+		while(dup2(priv->execpipe[0], 0) < 0 && errno == EINTR);
+		close(priv->execpipe[1]);
+		if (execl("/usr/bin/bmf", "bmf", "-t", (char *)NULL) < 0) {
+			perror("execl");
+			_exit(1);
+		}
+		break;
+	case -1:
+		free(priv);
+		smfi_setpriv(ctx, NULL);
+		return SMFIS_TEMPFAIL;
+	default:
+		priv->execpid = pid;
+		close(priv->execpipe[0]);
+		break;
+	}
+
+	return SMFIS_CONTINUE;
+}
+
+sfsistat
+mlfi_helo(SMFICTX *ctx, char *helohost)
+{
+	printf("mlfi_help\n");
+
+	return SMFIS_CONTINUE;
+}
+
+sfsistat
+mlfi_envfrom(SMFICTX *ctx, char *argv[])
+{
+	struct Priv *priv = MLFIPRIV;
+
+	printf("mlfi_envfrom(%s)\n", argv[0]);
+
+	dprintf(priv->execpipe[1], "From: %s\n", argv[0]);
+
+	return SMFIS_CONTINUE;
+}
+
+sfsistat
+mlfi_envrcpt(SMFICTX *ctx, char *argv[])
+{
+	struct Priv *priv = MLFIPRIV;
+
+	printf("mfli_envrcpt(%s)\n", argv[0]);
+
+	dprintf(priv->execpipe[1], "To: %s\n", argv[0]);
+
+	return SMFIS_CONTINUE;
+}
+
+sfsistat
+mlfi_header(SMFICTX *ctx, char *headerf, char *headerv)
+{
+	struct Priv *priv = MLFIPRIV;
+
+	printf("mlfi_header(%s = '%s')\n", headerf, headerv);
+
+	dprintf(priv->execpipe[1], "%s: %s\n", headerf, headerv);
+
+	return SMFIS_CONTINUE;
+}
+
+sfsistat
+mlfi_eoh(SMFICTX *ctx)
+{
+	struct Priv *priv = MLFIPRIV;
+
+	printf("mlfi_eoh\n");
+
+	dprintf(priv->execpipe[1], "\n");
+
+	return SMFIS_CONTINUE;
+}
+
+sfsistat
+mlfi_body(SMFICTX *ctx, unsigned char *bodyp, size_t bodylen)
+{
+        struct Priv *priv = MLFIPRIV;
+	int written;
+
+	printf("mlfi_body(%ld bytes)\n", bodylen);
+
+	for (int written = 0, rw = 0; written <= bodylen; written += rw)
+		rw = write(priv->execpipe[1], bodyp+written, bodylen-written);
+
+	return SMFIS_CONTINUE;
+}
+
+sfsistat
+mlfi_eom(SMFICTX *ctx)
+{
+	printf("mlfi_eom\n");
+	return mlfi_cleanup(ctx);
+}
+
+sfsistat
+mlfi_abort(SMFICTX *ctx)
+{
+	printf("mlfi_abort\n");
+	return mlfi_cleanup(ctx);
+}
+
+sfsistat
+mlfi_cleanup(SMFICTX *ctx)
+{
+	struct Priv *priv = MLFIPRIV;
+	int retcode = -1;
+
+	printf("mlfi_cleanup\n");
+
+	if (priv == NULL)
+		return SMFIS_CONTINUE;
+
+	close(priv->execpipe[1]);
+	waitpid(priv->execpid, &retcode, 0);
+
+	if (retcode == 0) {
+		if (smfi_addheader(ctx, "X-Spam-Flag", "YES") == MI_FAILURE)
+			return SMFIS_TEMPFAIL;
+		if (smfi_addheader(ctx, "X-BMF-Processed",
+					"YES") == MI_FAILURE) {
+			return SMFIS_TEMPFAIL;
+		}
+	}
+
+	return SMFIS_CONTINUE;
+}
+
+sfsistat
+mlfi_close(SMFICTX *ctx)
+{
+	struct Priv *priv = MLFIPRIV;
+
+	printf("mlfi_close\n");
+
+	if (priv != NULL) {
+		close(priv->execpipe[1]);
+		kill(priv->execpid, SIGKILL);
+		free(priv);
+		smfi_setpriv(ctx, NULL);
+	}
+
+	return SMFIS_CONTINUE;
+}
+
+sfsistat
+mlfi_unknown(SMFICTX *ctx, const char *cmd)
+{
+	printf("mlfi_unknown(%s)\n", cmd);
+	return SMFIS_CONTINUE;
+}
+
+sfsistat
+mlfi_data(SMFICTX * ctx)
+{
+	printf("mlfi_data\n");
+	return SMFIS_CONTINUE;
+}
+
+sfsistat
+mlfi_negotiate(SMFICTX *ctx,
+		unsigned long f0,
+		unsigned long f1,
+		unsigned long f2,
+		unsigned long f3,
+		unsigned long *pf0,
+		unsigned long *pf1,
+		unsigned long *pf2,
+		unsigned long *pf3)
+{
+	printf("mfli_negotiate\n");
+	return SMFIS_ALL_OPTS;
+}
+
+struct smfiDesc smfilter =
+{
+	"BMF",		/* filter name */
+	SMFI_VERSION,	/* version code -- do not change */
+	SMFIF_ADDHDRS,  /* flags */
+	mlfi_connect,	/* connection info filter */
+	mlfi_helo,	/* SMTP HELO command filter */
+	mlfi_envfrom,	/* envelope sender filter */
+	mlfi_envrcpt,	/* envelope recipient filter */
+	mlfi_header,	/* header filter */
+	mlfi_eoh,	/* end of header */
+	mlfi_body,	/* body block filter */
+	mlfi_eom,	/* end of message */
+	mlfi_abort,	/* message aborted */
+	mlfi_close,	/* connection cleanup */
+	mlfi_unknown,	/* unknown SMTP commands */
+	mlfi_data,	/* DATA command */
+	mlfi_negotiate	/* Once, at the start of each SMTP connection */
+};
+
+void
+usage(char *argv0)
+{
+	fprintf(stderr,
+		"Usage: %s [-h] [-d dbglvl] [-p listen] [-t timeout]\n",
+		argv0);
+}
+
+int
+main(int argc, char *argv[])
+{
+	char *argv0, *port;
+	int timeout;
+
+	port = "inet:9957";
+	timeout = 0;
+
+	ARGBEGIN(argv0) {
+	case 'd':
+		smfi_setdbg(atoi(EARGF(argv0)));
+		break;
+	case 'p':
+		port = EARGF(usage(argv0));
+		break;
+	case 't':
+		timeout = atoi(EARGF(usage(argv0)));
+		break;
+	default:
+		usage(argv0);
+		return 1;
+	} ARGEND;
+
+	printf("port = %s; timetout = %d;\n", port, timeout);
+
+	if (smfi_setconn(port) == MI_FAILURE) {
+		perror("smfi_setconn");
+		return 1;
+	}
+
+	if (!strncasecmp(port, "unix:", 5)) {
+		unlink(port + 5);
+	} else if (!strncasecmp(port, "local:", 6)) {
+		unlink(port + 6);
+	}
+
+	if (smfi_settimeout(timeout) == MI_FAILURE) {
+		perror("smfi_settimout");
+		return 1;
+	}
+
+	if (smfi_register(smfilter) == MI_FAILURE) {
+		perror("smfi_register");
+		return 1;
+	}
+
+	return smfi_main();
+}
+
diff --git a/bmf-milter.o b/bmf-milter.o
Binary files differ.