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Import NetBSD's mailwrapper to redirect /usr/sbin/sendmail to the user's

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chosen mailer.

Obtained from: NetBSD
This commit is contained in:
Peter Wemm 1999-12-19 13:50:37 +00:00
parent 9e19fa4980
commit 3ae9291301
6 changed files with 435 additions and 0 deletions
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8
etc/mail/mailer.conf Normal file
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# $NetBSD: mailer.conf,v 1.2 1999/02/05 18:11:23 perry Exp $
#
# Execute the "real" sendmail program, named /usr/libexec/sendmail/sendmail
#
sendmail /usr/libexec/sendmail/sendmail
send-mail /usr/libexec/sendmail/sendmail
mailq /usr/libexec/sendmail/sendmail
newaliases /usr/libexec/sendmail/sendmail

8
etc/mailer.conf Normal file
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# $NetBSD: mailer.conf,v 1.2 1999/02/05 18:11:23 perry Exp $
#
# Execute the "real" sendmail program, named /usr/libexec/sendmail/sendmail
#
sendmail /usr/libexec/sendmail/sendmail
send-mail /usr/libexec/sendmail/sendmail
mailq /usr/libexec/sendmail/sendmail
newaliases /usr/libexec/sendmail/sendmail

97
share/man/man5/mailer.conf.5 Normal file
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.\" $NetBSD: mailer.conf.5,v 1.2 1999/05/29 18:18:30 christos 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.
.\"
.\" The following requests are required for all man pages.
.Dd December 16, 1998
.Dt MAILER.CONF 5
.Os
.Sh NAME
.Nm mailer.conf
.Nd configuration file for
.Xr mailwrapper 8 .
.Sh DESCRIPTION
.Pp
The file
.Pa /etc/mailer.conf
contains a series of pairs. The first member of each pair is the name
of a program invoking
.Xr mailwrapper 8
which is typically a symbolic link to
.Pa /usr/sbin/sendmail .
(On a typical system,
.Xr newaliases 1
and
.Xr mailq 1
would be set up this way.)
The second member of each pair is the name of the program to
actually execute when the first name is invoked. The file may also
contain comments, denoted by a # mark in the first column of any line.
.Sh EXAMPLES
The following is an example of how to set up an
.Nm
for traditional sendmail invocation behavior.
.Bd -literal
# Execute the "real" sendmail program, named /usr/libexec/sendmail/sendmail
sendmail /usr/libexec/sendmail/sendmail
send-mail /usr/libexec/sendmail/sendmail
mailq /usr/libexec/sendmail/sendmail
newaliases /usr/libexec/sendmail/sendmail
.Ed
.Pp
This example shows how to invoke the fictitious "newmail" program in
place of sendmail.
.Bd -literal
# Emulate sendmail using postfix
sendmail /usr/libexec/postfix/sendmail
send-mail /usr/libexec/postfix/sendmail
mailq /usr/libexec/postfix/sendmail
newaliases /usr/libexec/postfix/sendmail
.Ed
.Sh FILES
/etc/mailer.conf
.Sh SEE ALSO
.Xr mail 1 ,
.Xr mailq 1 ,
.Xr mailwrapper 8 ,
.Xr newaliases 1 ,
.Xr sendmail 8 .
.Sh HISTORY
.Nm
appeared in
.Nx 1.4 .
.Sh AUTHORS
Perry E. Metzger <perry@piermont.com>
.Sh BUGS
The entire reason this program exists is a crock. Instead, a command
for how to submit mail should be standardized, and all the "behave
differently if invoked with a different name" behavior of things like
.Xr mailq 1
should go away.

13
usr.sbin/mailwrapper/Makefile Normal file
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# $NetBSD: Makefile,v 1.4 1999/03/25 16:40:18 is Exp $
PROG= mailwrapper
MAN= mailwrapper.8 mailer.conf.5
DPADD+= ${LIBUTIL}
LDADD+= -lutil
SYMLINKS= /usr/sbin/mailwrapper /usr/sbin/sendmail \
/usr/sbin/mailwrapper /usr/bin/newaliases \
/usr/sbin/mailwrapper /usr/bin/mailq
.include <bsd.prog.mk>

144
usr.sbin/mailwrapper/mailwrapper.8 Normal file
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.\" $NetBSD: mailwrapper.8,v 1.6 1999/03/25 16:40:17 is 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.
.\"
.\" The following requests are required for all man pages.
.Dd December 16, 1998
.Dt MAILWRAPPER 8
.Os
.Sh NAME
.Nm mailwrapper
.Nd invoke appropriate MTA software based on configuration file
.Sh SYNOPSIS
Special. See below.
.Sh DESCRIPTION
At one time, the only Mail Transfer Agent (MTA) software easily available
was
.Xr sendmail 8 .
As a result of this, most Mail User Agents (MUAs) such as
.Xr mail 1
had the path and calling conventions expected by
.Xr sendmail 8
compiled in.
.Pp
Times have changed, however.
On a modern
.Nx
system, the administrator may wish to use one of several
available MTAs.
.Pp
It would be difficult to modify all MUA software typically available
on a system, so most of the authors of alternative MTAs have written
their front end message submission programs so that they use the same
calling conventions as
.Xr sendmail 8
and may be put into place instead of
.Xr sendmail 8
in
.Pa /usr/sbin/sendmail .
.Pp
.Xr sendmail 8
also typically has aliases named
.Xr mailq 1
and
.Xr newaliases 1
linked to it. The program knows to behave differently when its
.Va argv[0]
is
.Dq mailq
or
.Dq newaliases
and behaves appropriately. Typically, replacement MTAs provide similar
functionality, either through a program that also switches behavior
based on calling name, or through a set of programs that provide
similar functionality.
.Pp
Although having replacement programs that plug replace
.Xr sendmail 8
helps in installing alternative MTAs, it essentially makes the
configuration of the system depend on hard installing new programs in
.Pa /usr .
This leads to configuration problems for many administrators, since
they may wish to install a new MTA without altering the system
provided
.Pa /usr .
(This may be, for example, to avoid having upgrade problems when a new
version of the system is installed over the old.)
They may also have a shared
.Pa /usr
among several
machines, and may wish to avoid placing implicit configuration
information in a read-only
.Pa /usr .
.Pp
The
.Nm
program is designed to replace
.Pa /usr/sbin/sendmail
and to invoke an appropriate MTA instead of
.Xr sendmail 8
based on configuration information placed in
.Pa /etc/mailer.conf .
This permits the administrator to configure which MTA is to be invoked on
the system at run time.
.Sh FILES
Configuration for
.Nm
is kept in
.Pa /etc/mailer.conf .
.Pa /usr/sbin/sendmail
is typically set up as a symlink to
.Nm
which is not usually invoked on its own.
.Sh DIAGNOSTICS
.Nm
will return an error value and print a diagnostic if its configuration
file is missing or malformed, or does not contain a mapping for the
name under which
.Nm
was invoked.
.Sh SEE ALSO
.Xr mail 1 ,
.Xr mailq 1 ,
.Xr mailer.conf 5 ,
.Xr newaliases 1 ,
.Xr sendmail 8 .
.Sh HISTORY
.Nm
appeared in
.Nx 1.4 .
.Sh AUTHORS
Perry E. Metzger <perry@piermont.com>
.Sh BUGS
The entire reason this program exists is a crock. Instead, a command
for how to submit mail should be standardized, and all the "behave
differently if invoked with a different name" behavior of things like
.Xr mailq 1
should go away.

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usr.sbin/mailwrapper/mailwrapper.c Normal file
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/* $NetBSD: mailwrapper.c,v 1.3 1999/05/29 18:18:15 christos 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 <err.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <util.h>
#define _PATH_MAILERCONF "/etc/mailer.conf"
struct arglist {
size_t argc, maxc;
char **argv;
};
int main __P((int, char *[], char *[]));
static void initarg __P((struct arglist *));
static void addarg __P((struct arglist *, const char *, int));
static void freearg __P((struct arglist *, int));
extern const char *__progname; /* from crt0.o */
static void
initarg(al)
struct arglist *al;
{
al->argc = 0;
al->maxc = 10;
if ((al->argv = malloc(al->maxc * sizeof(char *))) == NULL)
err(1, "mailwrapper");
}
static void
addarg(al, arg, copy)
struct arglist *al;
const char *arg;
int copy;
{
if (al->argc == al->maxc) {
al->maxc <<= 1;
if ((al->argv = realloc(al->argv,
al->maxc * sizeof(char *))) == NULL)
err(1, "mailwrapper");
}
if (copy) {
if ((al->argv[al->argc++] = strdup(arg)) == NULL)
err(1, "mailwrapper:");
} else
al->argv[al->argc++] = (char *)arg;
}
static void
freearg(al, copy)
struct arglist *al;
int copy;
{
size_t i;
if (copy)
for (i = 0; i < al->argc; i++)
free(al->argv[i]);
free(al->argv);
}
int
main(argc, argv, envp)
int argc;
char *argv[];
char *envp[];
{
FILE *config;
char *line, *cp, *from, *to, *ap;
size_t len, lineno = 0;
struct arglist al;
initarg(&al);
for (len = 0; len < argc; len++)
addarg(&al, argv[len], 0);
if ((config = fopen(_PATH_MAILERCONF, "r")) == NULL)
err(1, "mailwrapper: can't open %s", _PATH_MAILERCONF);
for (;;) {
if ((line = fparseln(config, &len, &lineno, NULL, 0)) == NULL) {
if (feof(config))
errx(1, "mailwrapper: no mapping in %s",
_PATH_MAILERCONF);
err(1, "mailwrapper");
}
#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)
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, 0);
break;
}
free(line);
}
(void)fclose(config);
execve(to, al.argv, envp);
freearg(&al, 0);
free(line);
err(1, "mailwrapper: execing %s", to);
/*NOTREACHED*/
parse_error:
freearg(&al, 0);
free(line);
errx(1, "mailwrapper: parse error in %s at line %lu",
_PATH_MAILERCONF, (u_long)lineno);
/*NOTREACHED*/
}