148 lines
3.9 KiB
C
148 lines
3.9 KiB
C
/* $NetBSD: mailwrapper.c,v 1.5 2001/02/19 23:22:44 cgd 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 <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 <util.h>
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#define _PATH_MAILERCONF "/etc/mailer.conf"
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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 __P((int, char *[], char *[]));
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static void initarg __P((struct arglist *));
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static void addarg __P((struct arglist *, const char *, int));
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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, "mailwrapper");
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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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if (al->argc == al->maxc) {
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al->maxc <<= 1;
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if ((al->argv = realloc(al->argv,
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al->maxc * sizeof(char *))) == NULL)
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err(1, "mailwrapper");
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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, "mailwrapper:");
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} else
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al->argv[al->argc++] = (char *)arg;
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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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err(1, "mailwrapper: can't open %s", _PATH_MAILERCONF);
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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, "mailwrapper: no mapping in %s",
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_PATH_MAILERCONF);
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err(1, "mailwrapper");
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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, getprogname()) == 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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err(1, "mailwrapper: execing %s", to);
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/*NOTREACHED*/
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parse_error:
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errx(1, "mailwrapper: 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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