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mailwrapper.c revision 1.1 
      1 /*	$NetBSD: mailwrapper.c,v 1.1 1998/12/25 22:06:59 perry Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1998
      5  * 	Perry E. Metzger.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgment:
     17  *	This product includes software developed for the NetBSD Project
     18  *	by Perry E. Metzger.
     19  * 4. The name of the author may not be used to endorse or promote products
     20  *    derived from this software without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     32  */
     33 
     34 #include <ctype.h>
     35 #include <err.h>
     36 #include <stdio.h>
     37 #include <string.h>
     38 #include <unistd.h>
     39 
     40 #define _PATH_MAILERCONF	"/etc/mailer.conf"
     41 
     42 int main __P((int, char *[], char *[]));
     43 
     44 int
     45 main(argc, argv, envp)
     46 	int argc;
     47 	char *argv[];
     48 	char *envp[];
     49 {
     50 	FILE *config;
     51 	char buf[BUFSIZ], from[BUFSIZ], to[BUFSIZ], orig[BUFSIZ];
     52 	char *tmp;
     53 
     54 	if ((config = fopen(_PATH_MAILERCONF, "r")) == NULL)
     55 		err(1, "mailswitch: can't open %s", _PATH_MAILERCONF);
     56 
     57 	if (strlen(argv[0]) > (BUFSIZ - 1))
     58 		errx(1, "mailswitch: invoking command pathname is too long.");
     59 
     60 	tmp = strrchr(argv[0], '/');
     61 	if (tmp == NULL)
     62 		strcpy(orig, argv[0]);
     63 	else
     64 		strcpy(orig, ++tmp);
     65 
     66 	while (1) {
     67 		if (fgets(buf, BUFSIZ, config) == NULL)
     68 			errx(1, "mailswitch: %s contains no mapping for %s",
     69 			    _PATH_MAILERCONF, orig);
     70 
     71 		if (buf[0] == '#')
     72 			continue;
     73 
     74 		if (sscanf(buf, "%s %s", from, to) != 2)
     75 			continue;
     76 
     77 		if (strcmp(from, orig) == 0)
     78 			break;
     79 	}
     80 
     81 	fclose(config);
     82 
     83 	execve(to, argv, envp);
     84 
     85 	err(1, "mailswitch: execing %s:", to);
     86 }
     87