bmf filter milter daemon
git clone git://
Log | Files | Refs | LICENSE

commit 06400a9712153d0754991be7db48715a72da510c
Author: Christoph Lohmann <>
Date:   Sat, 13 Jun 2020 21:16:08 +0200

Initial commit.

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> + + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. <> + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. By contrast, +the GNU General Public License is intended to guarantee your freedom to +share and change all versions of a program--to make sure it remains free +software for all its users. We, the Free Software Foundation, use the +GNU General Public License for most of our software; it applies also to +any other work released this way by its authors. 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If not, see <>. + +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 +<>. + + 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 +<>. 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.