mailwrapper - zygaena/hammerhead

root / base / usr / src / cmd / mailwrapper
mailwrapper Plain Text 758 lines 23.5 KB
#
# This file and its contents are supplied under the terms of the
# Common Development and Distribution License ("CDDL"), version 1.0.
# You may only use this file in accordance with the terms of version
# 1.0 of the CDDL.
#
# A full copy of the text of the CDDL should have accompanied this
# source.  A copy of the CDDL is also available via the Internet at
# http://www.illumos.org/license/CDDL.
#

#
# Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
# Copyright 2014 Alexander Pyhalov
# Copyright (c) 2018, Joyent, Inc.
#


LIBPROG=	mailwrapper

PROG=	       $(LIBPROG)

include ../Makefile.cmd

MWOBJS=		fgetln.o fparseln.o mailwrapper.o

CLOBBERFILES=	$(PROG)
CLEANFILES=	$(MWOBJS)

CPROG=		mailwrapper
CPROGSRC=	$(CPROG:%=_%.c)

CFS=		mailer.conf

ROOTETCFILES=$(CFS:%=$(ROOTETC)/%)

$(ROOTETCFILES) :	FILEMODE = 0644

# installed modules
ROOTLIBPROG=	$(LIBPROG:%=$(ROOTLIB)/%)

ROOTSYMLINKS=	$(ROOTBIN)/mailq \
		$(ROOTLIB)/sendmail \
		$(ROOTUSRSBIN)/newaliases \
		$(ROOTUSRSBIN)/sendmail

CPPFLAGS =	-I. $(CPPFLAGS.master)

SMOFF += all_func_returns

# conditional assignments
#
all:		TARGET= all
install:	TARGET= install
clean:		TARGET= clean
clobber:	TARGET= clobber

# install rules
$(ROOTINC)/% : %
	$(INS.file)

.KEEP_STATE:

.PARALLEL: $(MWOBJS) $(OBJS)

all:		$(PROG)

mailwrapper:	$(MWOBJS)
	$(LINK.c) -o $@ $(MWOBJS) $(LDLIBS)
	$(POST_PROCESS)

install: all .WAIT $(ROOTLIBPROG) $(ROOTSYMLINKS) $(ROOTETCFILES)

# ROOTSYMLINKS
#
$(ROOTBIN)/mailq:
	$(RM) $@; $(SYMLINK) ../lib/mailwrapper $@

$(ROOTLIB)/sendmail:
	$(RM) $@; $(SYMLINK) mailwrapper $@

$(ROOTUSRSBIN)/newaliases:
	$(RM) $@; $(SYMLINK) ../lib/mailwrapper $@

$(ROOTUSRSBIN)/sendmail:
	$(RM) $@; $(SYMLINK) ../lib/mailwrapper $@

$(ROOTETCMAIL)/%:  %
	$(INS.file)

clean:
	$(RM) $(OBJS) $(MWOBJS) mailwrapper

clobber: clean
	$(RM) $(ROOTSYMLINKS) $(ROOTLIBPROG) $(ROOTETCFILES)
fgetln.c is provided under the following license
/*-
 * Copyright (c) 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Christos Zoulas.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
fparseln.c is provided under the following license
/*
 * Copyright (c) 1997 Christos Zoulas.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Christos Zoulas.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
mailwrapper.c is provided under the following license
/*
 * Copyright (c) 1998
 *      Perry E. Metzger.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgment:
 *      This product includes software developed for the NetBSD Project
 *      by Perry E. Metzger.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

mailwrapper and BSD compatibilty functions
/*
 * Copyright (c) 1996  Peter Wemm <peter@FreeBSD.org>.
 * All rights reserved.
 * Copyright (c) 2002 Networks Associates Technology, Inc.
 * All rights reserved.
 *
 * Portions of this software were developed for the FreeBSD Project by
 * ThinkSec AS and NAI Labs, the Security Research Division of Network
 * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
 * ("CBOSS"), as part of the DARPA CHATS research program.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, is permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote
 *    products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/* This file contains extracts from FreeBSD libc and libutil headers */
#ifndef _COMPAT_H
#define	_COMPAT_H
#include <stdio.h>

#define	FPARSELN_UNESCESC	0x01
#define	FPARSELN_UNESCCONT	0x02
#define	FPARSELN_UNESCCOMM	0x04
#define	FPARSELN_UNESCREST	0x08
#define	FPARSELN_UNESCALL	0x0f

char *fparseln(FILE *, size_t *, size_t *, const char[3], int);
char *fgetln(FILE *, size_t *);
#endif /* _COMPAT_H */
/* $Id$ */
/*	$NetBSD: fgetln.c,v 1.3 2007/08/07 02:06:58 lukem Exp $	*/

/*
 * Copyright (c) 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Christos Zoulas.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/types.h>

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char *
fgetln(FILE *fp, size_t *len)
{
	static char *buf = NULL;
	static size_t bufsiz = 0;
	char *ptr;


	if (buf == NULL) {
		bufsiz = BUFSIZ;
		if ((buf = malloc(bufsiz)) == NULL)
			return (NULL);
	}

	if (fgets(buf, bufsiz, fp) == NULL)
		return (NULL);

	*len = 0;
	while ((ptr = strchr(&buf[*len], '\n')) == NULL) {
		size_t nbufsiz = bufsiz + BUFSIZ;
		char *nbuf = realloc(buf, nbufsiz);

		if (nbuf == NULL) {
			int oerrno = errno;
			free(buf);
			errno = oerrno;
			buf = NULL;
			return (NULL);
		} else
			buf = nbuf;

		*len = bufsiz;
		if (fgets(&buf[bufsiz], BUFSIZ, fp) == NULL)
			return (buf);

		bufsiz = nbufsiz;
	}

	*len = (ptr - buf) + 1;
	return (buf);
}
/*	$NetBSD: fparseln.c,v 1.9 1999/09/20 04:48:06 lukem Exp $	*/

/*
 * Copyright (c) 1997 Christos Zoulas.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Christos Zoulas.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <compat.h>

static int isescaped(const char *, const char *, int);

/*
 * isescaped():
 *	Return true if the character in *p that belongs to a string
 *	that starts in *sp, is escaped by the escape character esc.
 */
static int
isescaped(const char *sp, const char *p, int esc)
{
	const char	*cp;
	size_t		ne;

	/* No escape character */
	if (esc == '\0')
		return (1);

	/* Count the number of escape characters that precede ours */
	for (ne = 0, cp = p; --cp >= sp && *cp == esc; ne++)
		continue;

	/* Return true if odd number of escape characters */
	return ((ne & 1) != 0);
}


/*
 * fparseln():
 *	Read a line from a file parsing continuations ending in \
 *	and eliminating trailing newlines, or comments starting with
 *	the comment char.
 */
char *
fparseln(FILE *fp, size_t *size, size_t *lineno, const char str[3], int flags)
{
	static const char dstr[3] = { '\\', '\\', '#' };

	size_t	s, len;
	char   *buf;
	char   *ptr, *cp;
	int	cnt;
	char	esc, con, nl, com;

	len = 0;
	buf = NULL;
	cnt = 1;

	if (str == NULL)
		str = dstr;

	esc = str[0];
	con = str[1];
	com = str[2];
	/*
	 * XXX: it would be cool to be able to specify the newline character,
	 * but unfortunately, fgetln does not let us
	 */
	nl  = '\n';

	while (cnt) {
		cnt = 0;

		if (lineno)
			(*lineno)++;

		if ((ptr = fgetln(fp, &s)) == NULL)
			break;

		if (s && com) {		/* Check and eliminate comments */
			for (cp = ptr; cp < ptr + s; cp++)
				if (*cp == com && !isescaped(ptr, cp, esc)) {
					s = cp - ptr;
					cnt = s == 0 && buf == NULL;
					break;
				}
		}

		if (s && nl) { 		/* Check and eliminate newlines */
			cp = &ptr[s - 1];

			if (*cp == nl)
				s--;	/* forget newline */
		}

		if (s && con) {		/* Check and eliminate continuations */
			cp = &ptr[s - 1];

			if (*cp == con && !isescaped(ptr, cp, esc)) {
				s--;	/* forget escape */
				cnt = 1;
			}
		}

		if (s == 0 && buf != NULL)
			continue;

		if ((cp = realloc(buf, len + s + 1)) == NULL) {
			free(buf);
			return (NULL);
		}
		buf = cp;

		(void) memcpy(buf + len, ptr, s);
		len += s;
		buf[len] = '\0';
	}

	if ((flags & FPARSELN_UNESCALL) != 0 && esc && buf != NULL &&
	    strchr(buf, esc) != NULL) {
		ptr = cp = buf;
		while (cp[0] != '\0') {
			int skipesc;

			while (cp[0] != '\0' && cp[0] != esc)
				*ptr++ = *cp++;
			if (cp[0] == '\0' || cp[1] == '\0')
				break;

			skipesc = 0;
			if (cp[1] == com)
				skipesc += (flags & FPARSELN_UNESCCOMM);
			if (cp[1] == con)
				skipesc += (flags & FPARSELN_UNESCCONT);
			if (cp[1] == esc)
				skipesc += (flags & FPARSELN_UNESCESC);
			if (cp[1] != com && cp[1] != con && cp[1] != esc)
				skipesc = (flags & FPARSELN_UNESCREST);

			if (skipesc)
				cp++;
			else
				*ptr++ = *cp++;
			*ptr++ = *cp++;
		}
		*ptr = '\0';
		len = strlen(buf);
	}

	if (size) {
		*size = len;
	}
	return (buf);
}

#ifdef TEST

int
main(int argc, char *argv[])
{
	char   *ptr;
	size_t	size, line;

	line = 0;
	while ((ptr = fparseln(stdin, &size, &line, NULL,
	    FPARSELN_UNESCALL)) != NULL) {
		printf("line %d (%d) |%s|\n", line, size, ptr);
	}
	return (0);
}

/*
 * # This is a test
 * line 1
 * line 2 \
 * line 3 # Comment
 * line 4 \# Not comment \\\\
 *
 * # And a comment \
 * line 5 \\\
 * line 6
 *
 */

#endif /* TEST */
#
# This file configures mailwrapper(8).
# For details see mailer.conf(5).
#
# No MTA is installed by default.  To configure one, install an MTA
# package (e.g., OpenSMTPD, Postfix) and update the paths below.
#
# Example for OpenSMTPD:
#   sendmail	/usr/sbin/smtpctl
#   newaliases	/usr/sbin/smtpctl
#   mailq	/usr/sbin/smtpctl
#
# Example for Postfix:
#   sendmail	/usr/lib/smtp/postfix/sendmail
#   newaliases	/usr/lib/smtp/postfix/newaliases
#   mailq	/usr/lib/smtp/postfix/mailq
/*	$OpenBSD: mailwrapper.c,v 1.18 2007/11/06 14:39:19 otto Exp $	*/
/*	$NetBSD: mailwrapper.c,v 1.9 2003/03/09 08:10:43 mjl Exp $	*/

/*
 * Copyright (c) 1998
 * 	Perry E. Metzger.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgment:
 *	This product includes software developed for the NetBSD Project
 *	by Perry E. Metzger.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <compat.h>
#include <err.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <sysexits.h>
#include <syslog.h>
#include <limits.h>

#include "pathnames.h"

struct arglist {
	size_t argc, maxc;
	char **argv;
};

int main(int, char *[], char *[]);

static void initarg(struct arglist *);
static void addarg(struct arglist *, const char *);

static void
initarg(struct arglist *al)
{
	al->argc = 0;
	al->maxc = 10;
	if ((al->argv = calloc(al->maxc, sizeof (char *))) == NULL)
		err(EX_TEMPFAIL, "calloc");
}

static void
addarg(struct arglist *al, const char *arg)
{

	if (al->argc == al->maxc) {
		al->maxc <<= 1;
		al->argv = realloc(al->argv, al->maxc * sizeof (char *));
		if (al->argv == NULL)
			err(EX_TEMPFAIL, "realloc");
	}
	if (arg == NULL)
		al->argv[al->argc++] = NULL;
	else if ((al->argv[al->argc++] = strdup(arg)) == NULL)
		err(EX_TEMPFAIL, "strdup");
}

int
main(int argc, char *argv[], char *envp[])
{
	FILE *config;
	char *line, *cp, *from, *to, *ap;
	char progname[PATH_MAX+1];
	const char *name;
	size_t len, lineno = 0;
	int i;
	struct arglist al;

	/* change __progname to mailwrapper so we get sensible error messages */
	name = getprogname();
	if (name) {
		strncpy(progname, name, sizeof (progname));
	} else {
		err(EX_OSERR, "cannot get program name");
	}
	setprogname("mailwrapper");

	initarg(&al);
	addarg(&al, argv[0]);

	if ((config = fopen(_PATH_MAILERCONF, "r")) == NULL) {
		for (i = 1; i < argc; i++)
			addarg(&al, argv[i]);
		addarg(&al, NULL);
		openlog(getprogname(), LOG_PID, LOG_MAIL);
		syslog(LOG_INFO, "cannot open %s, using %s as default MTA",
		    _PATH_MAILERCONF, _PATH_DEFAULTMTA);
		closelog();
		execve(_PATH_DEFAULTMTA, al.argv, envp);
		err(EX_OSERR, "cannot exec %s", _PATH_DEFAULTMTA);
		/*NOTREACHED*/
	}

	for (;;) {
		if ((line = fparseln(config, &len, &lineno, NULL, 0)) == NULL) {
			if (feof(config))
				errx(EX_CONFIG, "no mapping for %s in %s",
				    progname, _PATH_MAILERCONF);
			err(EX_CONFIG, "cannot parse line %lu",
			    (ulong_t)lineno);
		}

#define	WS	" \t\n"
		cp = line;

		cp += strspn(cp, WS);
		if (cp[0] == '\0') {
			/* empty line */
			free(line);
			continue;
		}

		if ((from = strsep(&cp, WS)) == NULL || cp == NULL)
			goto parse_error;

		cp += strspn(cp, WS);

		if ((to = strsep(&cp, WS)) == NULL)
			goto parse_error;

		if (strcmp(from, progname) == 0) {
			for (ap = strsep(&cp, WS); ap != NULL;
			    ap = strsep(&cp, WS)) {
				if (*ap)
					addarg(&al, ap);
			}
			break;
		}

		free(line);
	}

	(void) fclose(config);

	for (i = 1; i < argc; i++)
		addarg(&al, argv[i]);

	addarg(&al, NULL);
	execve(to, al.argv, envp);
	err(EX_OSERR, "cannot exec %s", to);
	/*NOTREACHED*/
parse_error:
	errx(EX_CONFIG, "parse error in %s at line %lu",
	    _PATH_MAILERCONF, (ulong_t)lineno);
	/*NOTREACHED*/
	return (0);
}
/* $FreeBSD$ */

/*
 * Copyright (c) 1998
 * 	Perry E. Metzger.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgment:
 *	This product includes software developed for the NetBSD Project
 *	by Perry E. Metzger.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _PATHNAMES_H
#define	_PATHNAMES_H
#define	_PATH_MAILERCONF	"/etc/mailer.conf"
#define	_PATH_DEFAULTMTA	"/usr/sbin/smtpctl"
#endif /* _PATHNAMES_H */