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>
52 #include "pathnames.h"
59 int main(int, char *[], char *[]);
61 static void initarg(struct arglist *);
62 static void addarg(struct arglist *, const char *);
65 initarg(struct arglist *al)
69 if ((al->argv = calloc(al->maxc, sizeof(char *))) == NULL)
70 err(EX_TEMPFAIL, "calloc");
74 addarg(struct arglist *al, const char *arg)
77 if (al->argc == al->maxc) {
79 al->argv = realloc(al->argv, al->maxc * sizeof(char *));
81 err(EX_TEMPFAIL, "realloc");
84 al->argv[al->argc++] = NULL;
85 else if ((al->argv[al->argc++] = strdup(arg)) == NULL)
86 err(EX_TEMPFAIL, "strdup");
90 main(int argc, char *argv[], char *envp[])
93 char *line, *cp, *from, *to, *ap;
95 char localmailerconf[MAXPATHLEN];
96 const char *mailerconf;
97 size_t len, lineno = 0;
101 /* change __progname to mailwrapper so we get sensible error messages */
102 progname = getprogname();
103 setprogname("mailwrapper");
106 addarg(&al, argv[0]);
108 snprintf(localmailerconf, MAXPATHLEN, "%s/etc/mail/mailer.conf",
111 mailerconf = localmailerconf;
112 if ((config = fopen(localmailerconf, "r")) == NULL)
113 mailerconf = _PATH_MAILERCONF;
115 if (config == NULL && ((config = fopen(mailerconf, "r")) == NULL)) {
117 openlog(getprogname(), LOG_PID, LOG_MAIL);
118 syslog(LOG_INFO, "cannot open %s, using %s as default MTA",
119 mailerconf, _PATH_DEFAULTMTA);
121 execve(_PATH_DEFAULTMTA, al.argv, envp);
122 err(EX_OSERR, "cannot exec %s", _PATH_DEFAULTMTA);
127 if ((line = fparseln(config, &len, &lineno, NULL, 0)) == NULL) {
129 errx(EX_CONFIG, "no mapping in %s", mailerconf);
130 err(EX_CONFIG, "cannot parse line %lu", (u_long)lineno);
136 cp += strspn(cp, WS);
143 if ((from = strsep(&cp, WS)) == NULL || cp == NULL)
146 cp += strspn(cp, WS);
148 if ((to = strsep(&cp, WS)) == NULL)
151 if (strcmp(from, progname) == 0) {
152 for (ap = strsep(&cp, WS); ap != NULL;
153 ap = strsep(&cp, WS)) {
163 (void)fclose(config);
165 for (i = 1; i < argc; i++)
166 addarg(&al, argv[i]);
169 execve(to, al.argv, envp);
170 err(EX_OSERR, "cannot exec %s", to);
173 errx(EX_CONFIG, "parse error in %s at line %lu",
174 mailerconf, (u_long)lineno);