1 /* $NetBSD: mailwrapper.c,v 1.2 1999/02/20 22:10:07 thorpej 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 <err.h> 35 #include <stdio.h> 36 #include <string.h> 37 #include <stdlib.h> 38 #include <unistd.h> 39 #include <util.h> 40 41 #define _PATH_MAILERCONF "/etc/mailer.conf" 42 43 int main __P((int, char *[], char *[])); 44 45 extern const char *__progname; /* from crt0.o */ 46 47 int 48 main(argc, argv, envp) 49 int argc; 50 char *argv[]; 51 char *envp[]; 52 { 53 FILE *config; 54 char *line, *cp, *from, *to; 55 size_t len, lineno = 0; 56 57 if ((config = fopen(_PATH_MAILERCONF, "r")) == NULL) 58 err(1, "mailwrapper: can't open %s", _PATH_MAILERCONF); 59 60 for (;;) { 61 if ((line = fparseln(config, &len, &lineno, NULL, 0)) == NULL) { 62 if (feof(config)) 63 errx(1, "mailwrapper: no mapping in %s", 64 _PATH_MAILERCONF); 65 err(1, "mailwrapper"); 66 } 67 68 #define WHITESPACE " \t" 69 #define PARSE_ERROR \ 70 errx(1, "mailwrapper: parse error in %s at line %lu", \ 71 _PATH_MAILERCONF, (u_long)lineno) 72 73 cp = line; 74 75 cp += strspn(cp, WHITESPACE); 76 if (cp[0] == '\0') { 77 /* empty line */ 78 free(line); 79 continue; 80 } 81 82 if ((from = strsep(&cp, WHITESPACE)) == NULL) 83 PARSE_ERROR; 84 85 cp += strspn(cp, WHITESPACE); 86 87 if ((to = strsep(&cp, WHITESPACE)) == NULL) 88 PARSE_ERROR; 89 90 if (cp != NULL) { 91 cp += strspn(cp, WHITESPACE); 92 if (cp[0] != '\0') 93 PARSE_ERROR; 94 } 95 96 if (strcmp(from, __progname) == 0) 97 break; 98 99 free(line); 100 } 101 102 fclose(config); 103 104 execve(to, argv, envp); 105 106 err(1, "mailwrapper: execing %s", to); 107 } 108