cmd/cron/funcs.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*  Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*    All Rights Reserved   */

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <fcntl.h>
#include <stdlib.h>
#include <ctype.h>
#include <stdio.h>
#include <dirent.h>
#include <libintl.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <tzfile.h>
#include "cron.h"

#define CANTCD      "can't change directory to the at directory"
#define NOREADDIR   "can't read the at directory"
#define YEAR        1900
extern int audit_cron_is_anc_name(char *);

time_t
num(char **ptr)
{
    time_t n = 0;
    while (isdigit(**ptr)) {
        n = n*10 + (**ptr - '0');
        *ptr += 1; }
    return (n);
}


static int dom[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

int
days_btwn(int m1, int d1, int y1, int m2, int d2, int y2)
{
    /*
     * calculate the number of "full" days in between
     * m1/d1/y1 and m2/d2/y2.
     * NOTE: there should not be more than a year separation in the
     * dates. also, m should be in 0 to 11, and d should be in 1 to 31.
     */

    int days;
    int m;

    if ((m1 == m2) && (d1 == d2) && (y1 == y2))
        return (0);
    if ((m1 == m2) && (d1 < d2)) {
        /*
         * In case of d2==29 ,d1==28 and m1==m2==Feb and year is not
         * a leap year, this function should return the days till the
         * the next Feb 29.See Bug 4257355.
         */
        if (d2 > days_in_mon(m2, y2)) {
            int p;
            for (p = 1; ! isleap(y2+YEAR+p); p++)
                ;
            return (p*365 + d2-d1-1);
        }
        return (d2-d1-1);
    }
    /* the remaining dates are on different months */
    days = (days_in_mon(m1, y1)-d1) + (d2-1);
    m = (m1 + 1) % 12;
    while (m != m2) {
        if (m == 0)
            y1++;
        days += days_in_mon(m, y1);
        m = (m + 1) % 12;
    }
    return (days);
}

int
days_in_mon(int m, int y)
{
    /*
     * returns the number of days in month m of year y
     * NOTE: m should be in the range 0 to 11
     */
    return (dom[m] + (((m == 1) && isleap(y + YEAR)) ? 1 : 0));
}

void *
xmalloc(size_t size)
{
    char *p;

    if ((p = malloc(size)) == NULL) {
        perror("malloc");
        exit(55);
    }
    return (p);
}

void *
xcalloc(size_t nElements, size_t size)
{
    void *p;

    if ((p = calloc(nElements, size)) == NULL) {
        perror("calloc");
        exit(55);
    }
    return (p);
}

char *
xstrdup(const char *str)
{
    int len;
    char    *p;

    len = strlen(str);
    p = xmalloc(len + 1);
    (void) memcpy(p, str, len);
    p[len] = '\0';

    return (p);
}

void
cron_sendmsg(char action, char *login, char *fname, char etype)
{
    static int  msgfd = -2;
    struct message  *pmsg, msgbuf;
    int i;

    (void) memset(&msgbuf, 0, sizeof (msgbuf));
    pmsg = &msgbuf;
    if (msgfd == -2) {
        if ((msgfd = open(FIFO, O_WRONLY|O_NDELAY)) < 0) {
            if (errno == ENXIO || errno == ENOENT)
                (void) fprintf(stderr, gettext("cron may not"
                    " be running - call your system"
                    " administrator\n"));
            else
                (void) fprintf(stderr, gettext(
                    "error in message queue open\n"));
            return;
        }
    }
    pmsg->etype = etype;
    pmsg->action = action;
    (void) strlcpy(pmsg->fname, fname, FLEN);
    (void) strlcpy(pmsg->logname, login, LLEN);
    if ((i = write(msgfd, pmsg, sizeof (struct message))) < 0)
        (void) fprintf(stderr, gettext("error in message send\n"));
    else if (i != sizeof (struct message))
        (void) fprintf(stderr, gettext(
            "error in message send: Premature EOF\n"));
}

char
*errmsg(int errnum)
{
    char *msg;
    static char msg_buf[32];

    msg = strerror(errnum);

    if (msg == NULL) {
        (void) snprintf(msg_buf, sizeof (msg_buf),
            gettext("Error %d"), errnum);
        return (msg_buf);
    } else
        return (msg);
}

int
filewanted(struct dirent *direntry)
{
    char        *p;
    char        c;

    p = direntry->d_name;
    (void) num(&p);
    if (p == direntry->d_name)
        return (0); /* didn't start with a number */
    if (*p++ != '.')
        return (0); /* followed by a period */
    c = *p++;
    if (c < 'a' || c > 'z')
        return (0); /* followed by a queue name */
    if (audit_cron_is_anc_name(direntry->d_name))
        return (0);
    return (1);
}

int
isvalid_shell(const char *shell)
{
    char *t;
    int ret = 0;

    while ((t =  getusershell()) != NULL) {
        if (strcmp(t, shell) == 0) {
            ret = 1;
            break;
        }
    }
    endusershell();
    return (ret);
}

int
isvalid_dir(const char *dir)
{
    char *cwd = getcwd(NULL, 0);

    if (dir[0] != '/' || chdir(dir) == -1) {
        return (0);
    }
    if (cwd != NULL) {
        (void) chdir(cwd);
    }
    return (1);
}