1 /* $OpenBSD: mailwrapper.c,v 1.18 2007/11/06 14:39:19 otto Exp $ */ 2 /* $NetBSD: mailwrapper.c,v 1.9 2003/03/09 08:10:43 mjl Exp $ */ 3 4 /*- 5 * SPDX-License-Identifier: BSD-4-Clause 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 <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <sys/param.h> 41 42 #include <err.h> 43 #include <paths.h> 44 #include <stdio.h> 45 #include <string.h> 46 #include <unistd.h> 47 #include <stdlib.h> 48 #include <libutil.h> 49 #include <sysexits.h> 50 #include <syslog.h> 51 52 #include "pathnames.h" 53 54 struct arglist { 55 size_t argc, maxc; 56 char **argv; 57 }; 58 59 int main(int, char *[], char *[]); 60 61 static void initarg(struct arglist *); 62 static void addarg(struct arglist *, const char *); 63 64 static void 65 initarg(struct arglist *al) 66 { 67 al->argc = 0; 68 al->maxc = 10; 69 if ((al->argv = calloc(al->maxc, sizeof(char *))) == NULL) 70 err(EX_TEMPFAIL, "calloc"); 71 } 72 73 static void 74 addarg(struct arglist *al, const char *arg) 75 { 76 77 if (al->argc == al->maxc) { 78 al->maxc <<= 1; 79 al->argv = realloc(al->argv, al->maxc * sizeof(char *)); 80 if (al->argv == NULL) 81 err(EX_TEMPFAIL, "realloc"); 82 } 83 if (arg == NULL) 84 al->argv[al->argc++] = NULL; 85 else if ((al->argv[al->argc++] = strdup(arg)) == NULL) 86 err(EX_TEMPFAIL, "strdup"); 87 } 88 89 int 90 main(int argc, char *argv[], char *envp[]) 91 { 92 FILE *config; 93 char *line, *cp, *from, *to, *ap; 94 const char *progname; 95 char localmailerconf[MAXPATHLEN]; 96 const char *mailerconf; 97 size_t len, lineno = 0; 98 int i; 99 struct arglist al; 100 101 /* change __progname to mailwrapper so we get sensible error messages */ 102 progname = getprogname(); 103 setprogname("mailwrapper"); 104 105 initarg(&al); 106 addarg(&al, argv[0]); 107 108 snprintf(localmailerconf, MAXPATHLEN, "%s/etc/mail/mailer.conf", 109 getlocalbase()); 110 111 mailerconf = localmailerconf; 112 if ((config = fopen(localmailerconf, "r")) == NULL) 113 mailerconf = _PATH_MAILERCONF; 114 115 if (config == NULL && ((config = fopen(mailerconf, "r")) == NULL)) { 116 addarg(&al, NULL); 117 openlog(getprogname(), LOG_PID, LOG_MAIL); 118 syslog(LOG_INFO, "cannot open %s, using %s as default MTA", 119 mailerconf, _PATH_DEFAULTMTA); 120 closelog(); 121 execve(_PATH_DEFAULTMTA, al.argv, envp); 122 err(EX_OSERR, "cannot exec %s", _PATH_DEFAULTMTA); 123 /*NOTREACHED*/ 124 } 125 126 for (;;) { 127 if ((line = fparseln(config, &len, &lineno, NULL, 0)) == NULL) { 128 if (feof(config)) 129 errx(EX_CONFIG, "no mapping in %s", mailerconf); 130 err(EX_CONFIG, "cannot parse line %lu", (u_long)lineno); 131 } 132 133 #define WS " \t\n" 134 cp = line; 135 136 cp += strspn(cp, WS); 137 if (cp[0] == '\0') { 138 /* empty line */ 139 free(line); 140 continue; 141 } 142 143 if ((from = strsep(&cp, WS)) == NULL || cp == NULL) 144 goto parse_error; 145 146 cp += strspn(cp, WS); 147 148 if ((to = strsep(&cp, WS)) == NULL) 149 goto parse_error; 150 151 if (strcmp(from, progname) == 0) { 152 for (ap = strsep(&cp, WS); ap != NULL; 153 ap = strsep(&cp, WS)) { 154 if (*ap) 155 addarg(&al, ap); 156 } 157 break; 158 } 159 160 free(line); 161 } 162 163 (void)fclose(config); 164 165 for (i = 1; i < argc; i++) 166 addarg(&al, argv[i]); 167 168 addarg(&al, NULL); 169 execve(to, al.argv, envp); 170 err(EX_OSERR, "cannot exec %s", to); 171 /*NOTREACHED*/ 172 parse_error: 173 errx(EX_CONFIG, "parse error in %s at line %lu", 174 mailerconf, (u_long)lineno); 175 /*NOTREACHED*/ 176 } 177