From 3ae9291301ebfc1278c62a15e0ef1bba671106dc Mon Sep 17 00:00:00 2001 From: Peter Wemm Date: Sun, 19 Dec 1999 13:50:37 +0000 Subject: [PATCH] Import NetBSD's mailwrapper to redirect /usr/sbin/sendmail to the user's chosen mailer. Obtained from: NetBSD --- etc/mail/mailer.conf | 8 ++ etc/mailer.conf | 8 ++ share/man/man5/mailer.conf.5 | 97 +++++++++++++++++ usr.sbin/mailwrapper/Makefile | 13 +++ usr.sbin/mailwrapper/mailwrapper.8 | 144 +++++++++++++++++++++++++ usr.sbin/mailwrapper/mailwrapper.c | 165 +++++++++++++++++++++++++++++ 6 files changed, 435 insertions(+) create mode 100644 etc/mail/mailer.conf create mode 100644 etc/mailer.conf create mode 100644 share/man/man5/mailer.conf.5 create mode 100644 usr.sbin/mailwrapper/Makefile create mode 100644 usr.sbin/mailwrapper/mailwrapper.8 create mode 100644 usr.sbin/mailwrapper/mailwrapper.c diff --git a/etc/mail/mailer.conf b/etc/mail/mailer.conf new file mode 100644 index 000000000000..6d2b3c5ec3c6 --- /dev/null +++ b/etc/mail/mailer.conf @@ -0,0 +1,8 @@ +# $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 diff --git a/etc/mailer.conf b/etc/mailer.conf new file mode 100644 index 000000000000..6d2b3c5ec3c6 --- /dev/null +++ b/etc/mailer.conf @@ -0,0 +1,8 @@ +# $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 diff --git a/share/man/man5/mailer.conf.5 b/share/man/man5/mailer.conf.5 new file mode 100644 index 000000000000..6901cd733d19 --- /dev/null +++ b/share/man/man5/mailer.conf.5 @@ -0,0 +1,97 @@ +.\" $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 +.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. diff --git a/usr.sbin/mailwrapper/Makefile b/usr.sbin/mailwrapper/Makefile new file mode 100644 index 000000000000..ed1130fbfcf7 --- /dev/null +++ b/usr.sbin/mailwrapper/Makefile @@ -0,0 +1,13 @@ +# $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 diff --git a/usr.sbin/mailwrapper/mailwrapper.8 b/usr.sbin/mailwrapper/mailwrapper.8 new file mode 100644 index 000000000000..eb34a12becc8 --- /dev/null +++ b/usr.sbin/mailwrapper/mailwrapper.8 @@ -0,0 +1,144 @@ +.\" $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 +.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. diff --git a/usr.sbin/mailwrapper/mailwrapper.c b/usr.sbin/mailwrapper/mailwrapper.c new file mode 100644 index 000000000000..4d7d67d1a8df --- /dev/null +++ b/usr.sbin/mailwrapper/mailwrapper.c @@ -0,0 +1,165 @@ +/* $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 +#include +#include +#include +#include +#include + +#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*/ +}