1 /* $OpenBSD: mailwrapper.c,v 1.16 2004/07/06 03:38:14 millert Exp $ */ 2 /* $NetBSD: mailwrapper.c,v 1.9 2003/03/09 08:10:43 mjl Exp $ */ 3 /* $FreeBSD: src/usr.sbin/mailwrapper/mailwrapper.c,v 1.9 2003/07/06 12:44:11 charnier Exp $ */ 4 /* $DragonFly: src/usr.sbin/mailwrapper/mailwrapper.c,v 1.7 2005/07/04 11:36:30 corecode Exp $ */ 5 6 /* 7 * Copyright (c) 1998 8 * Perry E. Metzger. All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgment: 20 * This product includes software developed for the NetBSD Project 21 * by Perry E. Metzger. 22 * 4. The name of the author may not be used to endorse or promote products 23 * derived from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 28 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 29 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 30 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 31 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 34 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 35 */ 36 37 #include <err.h> 38 #include <stdio.h> 39 #include <string.h> 40 #include <stdlib.h> 41 #include <unistd.h> 42 #include <libutil.h> 43 #include <syslog.h> 44 #include <stdarg.h> 45 46 #include "pathnames.h" 47 48 struct arglist { 49 size_t argc, maxc; 50 char **argv; 51 }; 52 53 static void initarg(struct arglist *); 54 static void addarg(struct arglist *, char *, int); 55 56 static void 57 initarg(struct arglist *al) 58 { 59 al->argc = 0; 60 al->maxc = 10; 61 if ((al->argv = malloc(al->maxc * sizeof(char *))) == NULL) 62 err(1, NULL); 63 } 64 65 static void 66 addarg(struct arglist *al, char *arg, int copy) 67 { 68 if (al->argc == al->maxc) { 69 al->maxc <<= 1; 70 al->argv = realloc(al->argv, al->maxc * sizeof(char *)); 71 if (al->argv == NULL) 72 err(1, NULL); 73 } 74 if (copy) { 75 if ((al->argv[al->argc++] = strdup(arg)) == NULL) 76 err(1, NULL); 77 } else 78 al->argv[al->argc++] = arg; 79 } 80 81 int 82 main(int argc, char **argv, char **envp) 83 { 84 FILE *config; 85 char *line, *cp, *from, *to, *ap; 86 const char *progname; 87 size_t len, lineno = 0; 88 int i; 89 struct arglist al; 90 91 /* change progname to mailwrapper so we get sensible error messages */ 92 progname = getprogname(); 93 setprogname("mailwrapper"); 94 95 if ((config = fopen(_PATH_MAILERCONF, "r")) == NULL) { 96 openlog("mailwrapper", LOG_PID, LOG_MAIL); 97 syslog(LOG_INFO, "can't open %s, using %s as default MTA", 98 _PATH_MAILERCONF, _PATH_DEFAULTMTA); 99 closelog(); 100 execve(_PATH_DEFAULTMTA, argv, envp); 101 err(1, "cannot exec %s", _PATH_DEFAULTMTA); 102 /*NOTREACHED*/ 103 } 104 105 initarg(&al); 106 addarg(&al, argv[0], 0); 107 108 for (;;) { 109 if ((line = fparseln(config, &len, &lineno, NULL, 0)) == NULL) { 110 if (feof(config)) 111 errx(1, "no mapping in %s", _PATH_MAILERCONF); 112 err(1, NULL); 113 } 114 115 #define WS " \t\n" 116 cp = line; 117 118 cp += strspn(cp, WS); 119 if (cp[0] == '\0') { 120 /* empty line */ 121 free(line); 122 continue; 123 } 124 125 if ((from = strsep(&cp, WS)) == NULL) 126 goto parse_error; 127 128 cp += strspn(cp, WS); 129 130 if ((to = strsep(&cp, WS)) == NULL) 131 goto parse_error; 132 133 if (strcmp(from, progname) == 0) { 134 for (ap = strsep(&cp, WS); ap != NULL; 135 ap = strsep(&cp, WS)) 136 if (*ap) 137 addarg(&al, ap, 0); 138 break; 139 } 140 141 free(line); 142 } 143 144 fclose(config); 145 146 for (i = 1; i < argc; i++) 147 addarg(&al, argv[i], 0); 148 addarg(&al, NULL, 0); 149 150 execve(to, al.argv, envp); 151 err(1, "cannot exec %s", to); 152 /*NOTREACHED*/ 153 parse_error: 154 errx(1, "parse error in %s at line %lu", 155 _PATH_MAILERCONF, (u_long)lineno); 156 /*NOTREACHED*/ 157 } 158