cmd/mailwrapper/mailwrapper.c

287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov/*  $OpenBSD: mailwrapper.c,v 1.18 2007/11/06 14:39:19 otto Exp $   */
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov/*  $NetBSD: mailwrapper.c,v 1.9 2003/03/09 08:10:43 mjl Exp $  */
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov/*
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * Copyright (c) 1998
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov *  Perry E. Metzger.  All rights reserved.
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov *
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * Redistribution and use in source and binary forms, with or without
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * modification, are permitted provided that the following conditions
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * are met:
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * 1. Redistributions of source code must retain the above copyright
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov *    notice, this list of conditions and the following disclaimer.
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * 2. Redistributions in binary form must reproduce the above copyright
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov *    notice, this list of conditions and the following disclaimer in the
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov *    documentation and/or other materials provided with the distribution.
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * 3. All advertising materials mentioning features or use of this software
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov *    must display the following acknowledgment:
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov *  This product includes software developed for the NetBSD Project
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov *  by Perry E. Metzger.
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * 4. The name of the author may not be used to endorse or promote products
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov *    derived from this software without specific prior written permission.
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov *
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov */
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov#include <compat.h>
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov#include <err.h>
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov#include <stdio.h>
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov#include <string.h>
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov#include <unistd.h>
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov#include <stdlib.h>
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov#include <sysexits.h>
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov#include <syslog.h>
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov#include <limits.h>
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov#include "pathnames.h"
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalovstruct arglist {
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    size_t argc, maxc;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    char **argv;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov};
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalovint main(int, char *[], char *[]);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalovstatic void initarg(struct arglist *);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalovstatic void addarg(struct arglist *, const char *);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalovstatic void
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalovinitarg(struct arglist *al)
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov{
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    al->argc = 0;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    al->maxc = 10;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    if ((al->argv = calloc(al->maxc, sizeof (char *))) == NULL)
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        err(EX_TEMPFAIL, "calloc");
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov}
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalovstatic void
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalovaddarg(struct arglist *al, const char *arg)
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov{
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    if (al->argc == al->maxc) {
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        al->maxc <<= 1;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        al->argv = realloc(al->argv, al->maxc * sizeof (char *));
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        if (al->argv == NULL)
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov            err(EX_TEMPFAIL, "realloc");
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    }
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    if (arg == NULL)
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        al->argv[al->argc++] = NULL;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    else if ((al->argv[al->argc++] = strdup(arg)) == NULL)
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        err(EX_TEMPFAIL, "strdup");
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov}
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalovint
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalovmain(int argc, char *argv[], char *envp[])
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov{
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    FILE *config;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    char *line, *cp, *from, *to, *ap;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    char progname[PATH_MAX+1];
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    const char *name;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    size_t len, lineno = 0;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    int i;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    struct arglist al;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    /* change __progname to mailwrapper so we get sensible error messages */
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    name = getprogname();
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    if (name) {
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        strncpy(progname, name, sizeof (progname));
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    } else {
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        err(EX_OSERR, "cannot get program name");
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    }
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    setprogname("mailwrapper");
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    initarg(&al);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    addarg(&al, argv[0]);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    if ((config = fopen(_PATH_MAILERCONF, "r")) == NULL) {
53f6595f69361f7ab8b35a984dbf237ec111cdd9Sebastian Wiedenroth        for (i = 1; i < argc; i++)
53f6595f69361f7ab8b35a984dbf237ec111cdd9Sebastian Wiedenroth            addarg(&al, argv[i]);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        addarg(&al, NULL);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        openlog(getprogname(), LOG_PID, LOG_MAIL);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        syslog(LOG_INFO, "cannot open %s, using %s as default MTA",
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov            _PATH_MAILERCONF, _PATH_DEFAULTMTA);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        closelog();
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        execve(_PATH_DEFAULTMTA, al.argv, envp);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        err(EX_OSERR, "cannot exec %s", _PATH_DEFAULTMTA);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        /*NOTREACHED*/
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    }
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    for (;;) {
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        if ((line = fparseln(config, &len, &lineno, NULL, 0)) == NULL) {
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov            if (feof(config))
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov                errx(EX_CONFIG, "no mapping for %s in %s",
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov                    progname, _PATH_MAILERCONF);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov            err(EX_CONFIG, "cannot parse line %lu",
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov                (ulong_t)lineno);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        }
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov#define WS  " \t\n"
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        cp = line;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        cp += strspn(cp, WS);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        if (cp[0] == '\0') {
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov            /* empty line */
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov            free(line);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov            continue;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        }
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        if ((from = strsep(&cp, WS)) == NULL || cp == NULL)
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov            goto parse_error;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        cp += strspn(cp, WS);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        if ((to = strsep(&cp, WS)) == NULL)
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov            goto parse_error;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        if (strcmp(from, progname) == 0) {
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov            for (ap = strsep(&cp, WS); ap != NULL;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov                ap = strsep(&cp, WS)) {
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov                if (*ap)
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov                    addarg(&al, ap);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov            }
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov            break;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        }
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        free(line);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    }
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    (void) fclose(config);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    for (i = 1; i < argc; i++)
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        addarg(&al, argv[i]);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    addarg(&al, NULL);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    execve(to, al.argv, envp);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    err(EX_OSERR, "cannot exec %s", to);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    /*NOTREACHED*/
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalovparse_error:
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    errx(EX_CONFIG, "parse error in %s at line %lu",
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov        _PATH_MAILERCONF, (ulong_t)lineno);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    /*NOTREACHED*/
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov    return (0);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov}