/* $OpenBSD: mailwrapper.c,v 1.18 2007/11/06 14:39:19 otto Exp $ */
/* $NetBSD: mailwrapper.c,v 1.9 2003/03/09 08:10:43 mjl Exp $ */
/*-
* SPDX-License-Identifier: BSD-4-Clause
*
* Copyright (c) 1998
* Perry E. Metzger. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgment:
* This product includes software developed for the NetBSD Project
* by Perry E. Metzger.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <sys/param.h>
#include <err.h>
#include <paths.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <libutil.h>
#include <sysexits.h>
#include <syslog.h>
#include "pathnames.h"
struct arglist {
size_t argc, maxc;
char **argv;
};
int main(int, char *[], char *[]);
static void initarg(struct arglist *);
static void addarg(struct arglist *, const char *);
static void
initarg(struct arglist *al)
{
al->argc = 0;
al->maxc = 10;
if ((al->argv = calloc(al->maxc, sizeof(char *))) == NULL)
err(EX_TEMPFAIL, "calloc");
}
static void
addarg(struct arglist *al, const char *arg)
{
if (al->argc == al->maxc) {
al->maxc <<= 1;
al->argv = realloc(al->argv, al->maxc * sizeof(char *));
if (al->argv == NULL)
err(EX_TEMPFAIL, "realloc");
}
if (arg == NULL)
al->argv[al->argc++] = NULL;
else if ((al->argv[al->argc++] = strdup(arg)) == NULL)
err(EX_TEMPFAIL, "strdup");
}
int
main(int argc, char *argv[], char *envp[])
{
FILE *config;
char *line, *cp, *from, *to, *ap;
const char *progname;
char localmailerconf[MAXPATHLEN];
const char *mailerconf;
size_t len, lineno = 0;
int i;
struct arglist al;
/* change __progname to mailwrapper so we get sensible error messages */
progname = getprogname();
setprogname("mailwrapper");
initarg(&al);
addarg(&al, argv[0]);
snprintf(localmailerconf, MAXPATHLEN, "%s/etc/mail/mailer.conf",
getlocalbase());
mailerconf = localmailerconf;
if ((config = fopen(localmailerconf, "r")) == NULL)
mailerconf = _PATH_MAILERCONF;
if (config == NULL && ((config = fopen(mailerconf, "r")) == NULL)) {
addarg(&al, NULL);
openlog(getprogname(), LOG_PID, LOG_MAIL);
syslog(LOG_INFO, "cannot open %s, using %s as default MTA",
mailerconf, _PATH_DEFAULTMTA);
closelog();
execve(_PATH_DEFAULTMTA, al.argv, envp);
err(EX_OSERR, "cannot exec %s", _PATH_DEFAULTMTA);
/*NOTREACHED*/
}
for (;;) {
if ((line = fparseln(config, &len, &lineno, NULL, 0)) == NULL) {
if (feof(config))
errx(EX_CONFIG, "no mapping in %s", mailerconf);
err(EX_CONFIG, "cannot parse line %lu", (u_long)lineno);
}
#define WS " \t\n"
cp = line;
cp += strspn(cp, WS);
if (cp[0] == '\0') {
/* empty line */
free(line);
continue;
}
if ((from = strsep(&cp, WS)) == NULL || cp == NULL)
goto parse_error;
cp += strspn(cp, WS);
if ((to = strsep(&cp, WS)) == NULL)
goto parse_error;
if (strcmp(from, progname) == 0) {
for (ap = strsep(&cp, WS); ap != NULL;
ap = strsep(&cp, WS)) {
if (*ap)
addarg(&al, ap);
}
break;
}
free(line);
}
(void)fclose(config);
for (i = 1; i < argc; i++)
addarg(&al, argv[i]);
addarg(&al, NULL);
execve(to, al.argv, envp);
err(EX_OSERR, "cannot exec %s", to);
/*NOTREACHED*/
parse_error:
errx(EX_CONFIG, "parse error in %s at line %lu",
mailerconf, (u_long)lineno);
/*NOTREACHED*/
}
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