NetBSD/usr.sbin/mailwrapper/mailwrapper.c

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/* $NetBSD: mailwrapper.c,v 1.1 1998/12/25 22:06:59 perry 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 <ctype.h>
#include <err.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#define _PATH_MAILERCONF "/etc/mailer.conf"
int main __P((int, char *[], char *[]));
int
main(argc, argv, envp)
int argc;
char *argv[];
char *envp[];
{
FILE *config;
char buf[BUFSIZ], from[BUFSIZ], to[BUFSIZ], orig[BUFSIZ];
char *tmp;
if ((config = fopen(_PATH_MAILERCONF, "r")) == NULL)
err(1, "mailswitch: can't open %s", _PATH_MAILERCONF);
if (strlen(argv[0]) > (BUFSIZ - 1))
errx(1, "mailswitch: invoking command pathname is too long.");
tmp = strrchr(argv[0], '/');
if (tmp == NULL)
strcpy(orig, argv[0]);
else
strcpy(orig, ++tmp);
while (1) {
if (fgets(buf, BUFSIZ, config) == NULL)
errx(1, "mailswitch: %s contains no mapping for %s",
_PATH_MAILERCONF, orig);
if (buf[0] == '#')
continue;
if (sscanf(buf, "%s %s", from, to) != 2)
continue;
if (strcmp(from, orig) == 0)
break;
}
fclose(config);
execve(to, argv, envp);
err(1, "mailswitch: execing %s:", to);
}