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 $ */
5 * SPDX-License-Identifier: BSD-4-Clause
8 * Perry E. Metzger. All rights reserved.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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.
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
40 #include <sys/param.h>
51 #include "pathnames.h"
58 int main(int, char *[], char *[]);
60 static void initarg(struct arglist *);
61 static void addarg(struct arglist *, const char *);
64 initarg(struct arglist *al)
68 if ((al->argv = calloc(al->maxc, sizeof(char *))) == NULL)
69 err(EX_TEMPFAIL, "calloc");
73 addarg(struct arglist *al, const char *arg)
76 if (al->argc == al->maxc) {
78 al->argv = realloc(al->argv, al->maxc * sizeof(char *));
80 err(EX_TEMPFAIL, "realloc");
83 al->argv[al->argc++] = NULL;
84 else if ((al->argv[al->argc++] = strdup(arg)) == NULL)
85 err(EX_TEMPFAIL, "strdup");
89 main(int argc, char *argv[], char *envp[])
92 char *line, *cp, *from, *to, *ap;
94 char localmailerconf[MAXPATHLEN];
95 const char *mailerconf;
96 size_t len, lineno = 0;
100 /* change __progname to mailwrapper so we get sensible error messages */
101 progname = getprogname();
102 setprogname("mailwrapper");
105 addarg(&al, argv[0]);
107 snprintf(localmailerconf, MAXPATHLEN, "%s/etc/mail/mailer.conf",
108 getenv("LOCALBASE") ? getenv("LOCALBASE") : "/usr/local");
110 mailerconf = localmailerconf;
111 if ((config = fopen(localmailerconf, "r")) == NULL)
112 mailerconf = _PATH_MAILERCONF;
114 if (config == NULL && ((config = fopen(mailerconf, "r")) == NULL)) {
116 openlog(getprogname(), LOG_PID, LOG_MAIL);
117 syslog(LOG_INFO, "cannot open %s, using %s as default MTA",
118 mailerconf, _PATH_DEFAULTMTA);
120 execve(_PATH_DEFAULTMTA, al.argv, envp);
121 err(EX_OSERR, "cannot exec %s", _PATH_DEFAULTMTA);
126 if ((line = fparseln(config, &len, &lineno, NULL, 0)) == NULL) {
128 errx(EX_CONFIG, "no mapping in %s", mailerconf);
129 err(EX_CONFIG, "cannot parse line %lu", (u_long)lineno);
135 cp += strspn(cp, WS);
142 if ((from = strsep(&cp, WS)) == NULL || cp == NULL)
145 cp += strspn(cp, WS);
147 if ((to = strsep(&cp, WS)) == NULL)
150 if (strcmp(from, progname) == 0) {
151 for (ap = strsep(&cp, WS); ap != NULL;
152 ap = strsep(&cp, WS)) {
162 (void)fclose(config);
164 for (i = 1; i < argc; i++)
165 addarg(&al, argv[i]);
168 execve(to, al.argv, envp);
169 err(EX_OSERR, "cannot exec %s", to);
172 errx(EX_CONFIG, "parse error in %s at line %lu",
173 mailerconf, (u_long)lineno);