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191 lines
4.6 KiB
C
191 lines
4.6 KiB
C
/* $OpenBSD: mailwrapper.c,v 1.6 1999/12/17 05:06:28 mickey Exp $ */
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/* $NetBSD: mailwrapper.c,v 1.3 1999/05/29 18:18:15 christos Exp $ */
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/*
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* Copyright (c) 1998
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* Perry E. Metzger. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgment:
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* This product includes software developed for the NetBSD Project
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* by Perry E. Metzger.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <err.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <libutil.h>
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#include <syslog.h>
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#include <stdarg.h>
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#include "pathnames.h"
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struct arglist {
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size_t argc, maxc;
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char **argv;
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};
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int main(int, char *[], char *[]);
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static void initarg(struct arglist *);
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static void addarg(struct arglist *, const char *, int);
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static void freearg(struct arglist *, int);
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extern const char *__progname; /* from crt0.o */
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static void
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initarg(al)
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struct arglist *al;
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{
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al->argc = 0;
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al->maxc = 10;
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if ((al->argv = malloc(al->maxc * sizeof(char *))) == NULL)
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err(1, NULL);
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}
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static void
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addarg(al, arg, copy)
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struct arglist *al;
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const char *arg;
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int copy;
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{
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char **argv2;
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if (al->argc == al->maxc) {
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al->maxc <<= 1;
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if ((argv2 = realloc(al->argv,
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al->maxc * sizeof(char *))) == NULL) {
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if (al->argv)
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free(al->argv);
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al->argv = NULL;
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err(1, NULL);
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} else {
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al->argv = argv2;
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}
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}
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if (copy) {
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if ((al->argv[al->argc++] = strdup(arg)) == NULL)
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err(1, NULL);
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} else
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al->argv[al->argc++] = (char *)arg;
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}
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static void
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freearg(al, copy)
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struct arglist *al;
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int copy;
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{
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size_t i;
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if (copy)
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for (i = 0; i < al->argc; i++)
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free(al->argv[i]);
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free(al->argv);
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}
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int
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main(argc, argv, envp)
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int argc;
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char *argv[];
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char *envp[];
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{
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FILE *config;
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char *line, *cp, *from, *to, *ap;
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size_t len, lineno = 0;
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struct arglist al;
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initarg(&al);
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for (len = 0; len < argc; len++)
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addarg(&al, argv[len], 0);
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if ((config = fopen(_PATH_MAILERCONF, "r")) == NULL) {
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addarg(&al, NULL, 0);
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openlog("mailwrapper", LOG_PID, LOG_MAIL);
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syslog(LOG_INFO, "can't open %s, using %s as default MTA",
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_PATH_MAILERCONF, _PATH_DEFAULTMTA);
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closelog();
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execve(_PATH_DEFAULTMTA, al.argv, envp);
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freearg(&al, 0);
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err(1, "execing %s", _PATH_DEFAULTMTA);
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/*NOTREACHED*/
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}
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for (;;) {
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if ((line = fparseln(config, &len, &lineno, NULL, 0)) == NULL) {
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if (feof(config))
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errx(1, "no mapping in %s", _PATH_MAILERCONF);
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err(1, "can't parse line %lu", (u_long)lineno);
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}
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#define WS " \t\n"
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cp = line;
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cp += strspn(cp, WS);
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if (cp[0] == '\0') {
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/* empty line */
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free(line);
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continue;
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}
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if ((from = strsep(&cp, WS)) == NULL)
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goto parse_error;
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cp += strspn(cp, WS);
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if ((to = strsep(&cp, WS)) == NULL)
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goto parse_error;
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if (strcmp(from, __progname) == 0) {
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for (ap = strsep(&cp, WS); ap != NULL;
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ap = strsep(&cp, WS))
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if (*ap)
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addarg(&al, ap, 0);
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break;
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}
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free(line);
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}
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(void)fclose(config);
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addarg(&al, NULL, 0);
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execve(to, al.argv, envp);
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freearg(&al, 0);
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warn("execing %s", to);
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free(line);
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exit(1);
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/*NOTREACHED*/
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parse_error:
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freearg(&al, 0);
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free(line);
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errx(1, "parse error in %s at line %lu",
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_PATH_MAILERCONF, (u_long)lineno);
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/*NOTREACHED*/
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}
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