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optr.c

/*
 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
 * Reserved.  This file contains Original Code and/or Modifications of
 * Original Code as defined in and that are subject to the Apple Public
 * Source License Version 1.0 (the 'License').  You may not use this file
 * except in compliance with the License.  Please obtain a copy of the
 * License at http://www.apple.com/publicsource and read it before using
 * this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License."
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*-
 * Copyright (c) 1980, 1988, 1993
 *    The Regents of the University of California.  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 acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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/param.h>
#include <sys/wait.h>
#include <sys/time.h>

#include <errno.h>
#include <fstab.h>
#include <grp.h>
#include <signal.h>
#include <stdio.h>
#ifdef __STDC__
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#endif
#include <tzfile.h>
#ifdef __STDC__
#include <unistd.h>
#endif
#include <utmp.h>
#ifndef __STDC__
#include <varargs.h>
#endif

#include "dump.h"
#include "pathnames.h"

void  alarmcatch __P((/* int, int */));
int   datesort __P((const void *, const void *));
static      void sendmes __P((char *, char *));

/*
 *    Query the operator; This previously-fascist piece of code
 *    no longer requires an exact response.
 *    It is intended to protect dump aborting by inquisitive
 *    people banging on the console terminal to see what is
 *    happening which might cause dump to croak, destroying
 *    a large number of hours of work.
 *
 *    Every 2 minutes we reprint the message, alerting others
 *    that dump needs attention.
 */
static      int timeout;
static      char *attnmessage;            /* attention message */

int
query(question)
      char  *question;
{
      char  replybuffer[64];
      int   back, errcount;
      FILE  *mytty;

      if ((mytty = fopen(_PATH_TTY, "r")) == NULL)
            quit("fopen on %s fails: %s\n", _PATH_TTY, strerror(errno));
      attnmessage = question;
      timeout = 0;
      alarmcatch();
      back = -1;
      errcount = 0;
      do {
            if (fgets(replybuffer, 63, mytty) == NULL) {
                  clearerr(mytty);
                  if (++errcount > 30)    /* XXX      ugly */
                        quit("excessive operator query failures\n");
            } else if (replybuffer[0] == 'y' || replybuffer[0] == 'Y') {
                  back = 1;
            } else if (replybuffer[0] == 'n' || replybuffer[0] == 'N') {
                  back = 0;
            } else {
                  (void) fprintf(stderr,
                      "  DUMP: \"Yes\" or \"No\"?\n");
                  (void) fprintf(stderr,
                      "  DUMP: %s: (\"yes\" or \"no\") ", question);
            }
      } while (back < 0);

      /*
       *    Turn off the alarm, and reset the signal to trap out..
       */
      (void) alarm(0);
      if (signal(SIGALRM, sig) == SIG_IGN)
            signal(SIGALRM, SIG_IGN);
      (void) fclose(mytty);
      return(back);
}

char lastmsg[100];

/*
 *    Alert the console operator, and enable the alarm clock to
 *    sleep for 2 minutes in case nobody comes to satisfy dump
 */
void
alarmcatch()
{
      if (notify == 0) {
            if (timeout == 0)
                  (void) fprintf(stderr,
                      "  DUMP: %s: (\"yes\" or \"no\") ",
                      attnmessage);
            else
                  msgtail("\7\7");
      } else {
            if (timeout) {
                  msgtail("\n");
                  broadcast("");          /* just print last msg */
            }
            (void) fprintf(stderr,"  DUMP: %s: (\"yes\" or \"no\") ",
                attnmessage);
      }
      signal(SIGALRM, alarmcatch);
      (void) alarm(120);
      timeout = 1;
}

/*
 *    Here if an inquisitive operator interrupts the dump program
 */
void
interrupt(signo)
      int signo;
{
      msg("Interrupt received.\n");
      if (query("Do you want to abort dump?"))
            dumpabort(0);
}

/*
 *    The following variables and routines manage alerting
 *    operators to the status of dump.
 *    This works much like wall(1) does.
 */
struct      group *gp;

/*
 *    Get the names from the group entry "operator" to notify.
 */   
void
set_operators()
{
      if (!notify)            /*not going to notify*/
            return;
      gp = getgrnam(OPGRENT);
      (void) endgrent();
      if (gp == NULL) {
            msg("No group entry for %s.\n", OPGRENT);
            notify = 0;
            return;
      }
}

struct tm *localclock;

/*
 *    We fork a child to do the actual broadcasting, so
 *    that the process control groups are not messed up
 */
void
broadcast(message)
      char  *message;
{
      time_t            clock;
      FILE  *f_utmp;
      struct      utmp  utmp;
      char  **np;
      int   pid, s;

      if (!notify || gp == NULL)
            return;

      switch (pid = fork()) {
      case -1:
            return;
      case 0:
            break;
      default:
            while (wait(&s) != pid)
                  continue;
            return;
      }

      clock = time((time_t *)0);
      localclock = localtime(&clock);

      if ((f_utmp = fopen(_PATH_UTMP, "r")) == NULL) {
            msg("Cannot open %s: %s\n", _PATH_UTMP, strerror(errno));
            return;
      }

      while (!feof(f_utmp)) {
            if (fread((char *) &utmp, sizeof (struct utmp), 1, f_utmp) != 1)
                  break;
            if (utmp.ut_name[0] == 0)
                  continue;
            for (np = gp->gr_mem; *np; np++) {
                  if (strncmp(*np, utmp.ut_name, sizeof(utmp.ut_name)) != 0)
                        continue;
                  /*
                   *    Do not send messages to operators on dialups
                   */
                  if (strncmp(utmp.ut_line, DIALUP, strlen(DIALUP)) == 0)
                        continue;
#ifdef DEBUG
                  msg("Message to %s at %s\n", *np, utmp.ut_line);
#endif
                  sendmes(utmp.ut_line, message);
            }
      }
      (void) fclose(f_utmp);
      Exit(0);    /* the wait in this same routine will catch this */
      /* NOTREACHED */
}

static void
sendmes(tty, message)
      char *tty, *message;
{
      char t[50], buf[BUFSIZ];
      register char *cp;
      int lmsg = 1;
      FILE *f_tty;

      (void) strcpy(t, _PATH_DEV);
      (void) strcat(t, tty);

      if ((f_tty = fopen(t, "w")) != NULL) {
            setbuf(f_tty, buf);
            (void) fprintf(f_tty,
                "\n\
\7\7\7Message from the dump program to all operators at %d:%02d ...\r\n\n\
DUMP: NEEDS ATTENTION: ",
                localclock->tm_hour, localclock->tm_min);
            for (cp = lastmsg; ; cp++) {
                  if (*cp == '\0') {
                        if (lmsg) {
                              cp = message;
                              if (*cp == '\0')
                                    break;
                              lmsg = 0;
                        } else
                              break;
                  }
                  if (*cp == '\n')
                        (void) putc('\r', f_tty);
                  (void) putc(*cp, f_tty);
            }
            (void) fclose(f_tty);
      }
}

/*
 *    print out an estimate of the amount of time left to do the dump
 */

time_t      tschedule = 0;

void
timeest()
{
      time_t      tnow, deltat;

      (void) time((time_t *) &tnow);
      if (tnow >= tschedule) {
            tschedule = tnow + 300;
            if (blockswritten < 500)
                  return;     
            deltat = tstart_writing - tnow +
                  (1.0 * (tnow - tstart_writing))
                  / blockswritten * tapesize;
            msg("%3.2f%% done, finished in %d:%02d\n",
                  (blockswritten * 100.0) / tapesize,
                  deltat / 3600, (deltat % 3600) / 60);
      }
}

void
#if __STDC__
msg(const char *fmt, ...)
#else
msg(fmt, va_alist)
      char *fmt;
      va_dcl
#endif
{
      va_list ap;

      (void) fprintf(stderr,"  DUMP: ");
#ifdef TDEBUG
      (void) fprintf(stderr, "pid=%d ", getpid());
#endif
#if __STDC__
      va_start(ap, fmt);
#else
      va_start(ap);
#endif
      (void) vfprintf(stderr, fmt, ap);
      (void) fflush(stdout);
      (void) fflush(stderr);
      (void) vsprintf(lastmsg, fmt, ap);
      va_end(ap);
}

void
#if __STDC__
msgtail(const char *fmt, ...)
#else
msgtail(fmt, va_alist)
      char *fmt;
      va_dcl
#endif
{
      va_list ap;
#if __STDC__
      va_start(ap, fmt);
#else
      va_start(ap);
#endif
      (void) vfprintf(stderr, fmt, ap);
      va_end(ap);
}

void
#if __STDC__
quit(const char *fmt, ...)
#else
quit(fmt, va_alist)
      char *fmt;
      va_dcl
#endif
{
      va_list ap;

      (void) fprintf(stderr,"  DUMP: ");
#ifdef TDEBUG
      (void) fprintf(stderr, "pid=%d ", getpid());
#endif
#if __STDC__
      va_start(ap, fmt);
#else
      va_start(ap);
#endif
      (void) vfprintf(stderr, fmt, ap);
      va_end(ap);
      (void) fflush(stdout);
      (void) fflush(stderr);
      dumpabort(0);
}

/*
 *    Tell the operator what has to be done;
 *    we don't actually do it
 */

struct fstab *
allocfsent(fs)
      register struct fstab *fs;
{
      register struct fstab *new;

      new = (struct fstab *)malloc(sizeof (*fs));
      if (new == NULL ||
          (new->fs_file = strdup(fs->fs_file)) == NULL ||
          (new->fs_type = strdup(fs->fs_type)) == NULL ||
          (new->fs_spec = strdup(fs->fs_spec)) == NULL)
            quit("%s\n", strerror(errno));
      new->fs_passno = fs->fs_passno;
      new->fs_freq = fs->fs_freq;
      return (new);
}

struct      pfstab {
      struct      pfstab *pf_next;
      struct      fstab *pf_fstab;
};

static      struct pfstab *table;

void
getfstab()
{
      register struct fstab *fs;
      register struct pfstab *pf;

      if (setfsent() == 0) {
            msg("Can't open %s for dump table information: %s\n",
                _PATH_FSTAB, strerror(errno));
            return;
      }
      while ((fs = getfsent()) != NULL) {
            if (strcmp(fs->fs_type, FSTAB_RW) &&
                strcmp(fs->fs_type, FSTAB_RO) &&
                strcmp(fs->fs_type, FSTAB_RQ))
                  continue;
            fs = allocfsent(fs);
            if ((pf = (struct pfstab *)malloc(sizeof (*pf))) == NULL)
                  quit("%s\n", strerror(errno));
            pf->pf_fstab = fs;
            pf->pf_next = table;
            table = pf;
      }
      (void) endfsent();
}

/*
 * Search in the fstab for a file name.
 * This file name can be either the special or the path file name.
 *
 * The entries in the fstab are the BLOCK special names, not the
 * character special names.
 * The caller of fstabsearch assures that the character device
 * is dumped (that is much faster)
 *
 * The file name can omit the leading '/'.
 */
struct fstab *
fstabsearch(key)
      char *key;
{
      register struct pfstab *pf;
      register struct fstab *fs;
      char *rn;

      for (pf = table; pf != NULL; pf = pf->pf_next) {
            fs = pf->pf_fstab;
            if (strcmp(fs->fs_file, key) == 0 ||
                strcmp(fs->fs_spec, key) == 0)
                  return (fs);
            rn = rawname(fs->fs_spec);
            if (rn != NULL && strcmp(rn, key) == 0)
                  return (fs);
            if (key[0] != '/') {
                  if (*fs->fs_spec == '/' &&
                      strcmp(fs->fs_spec + 1, key) == 0)
                        return (fs);
                  if (*fs->fs_file == '/' &&
                      strcmp(fs->fs_file + 1, key) == 0)
                        return (fs);
            }
      }
      return (NULL);
}

/*
 *    Tell the operator what to do
 */
void
lastdump(arg)
      char  arg;  /* w ==> just what to do; W ==> most recent dumps */
{
      register int i;
      register struct fstab *dt;
      register struct dumpdates *dtwalk;
      char *lastname, *date;
      int dumpme;
      time_t tnow;

      (void) time(&tnow);
      getfstab();       /* /etc/fstab input */
      initdumptimes();  /* /etc/dumpdates input */
      qsort((char *) ddatev, nddates, sizeof(struct dumpdates *), datesort);

      if (arg == 'w')
            (void) printf("Dump these file systems:\n");
      else
            (void) printf("Last dump(s) done (Dump '>' file systems):\n");
      lastname = "??";
      ITITERATE(i, dtwalk) {
            if (strncmp(lastname, dtwalk->dd_name,
                sizeof(dtwalk->dd_name)) == 0)
                  continue;
            date = (char *)ctime(&dtwalk->dd_ddate);
            date[16] = '\0';  /* blast away seconds and year */
            lastname = dtwalk->dd_name;
            dt = fstabsearch(dtwalk->dd_name);
            dumpme = (dt != NULL &&
                dt->fs_freq != 0 &&
                dtwalk->dd_ddate < tnow - (dt->fs_freq * SECSPERDAY));
            if (arg != 'w' || dumpme)
                  (void) printf(
                      "%c %8s\t(%6s) Last dump: Level %c, Date %s\n",
                      dumpme && (arg != 'w') ? '>' : ' ',
                      dtwalk->dd_name,
                      dt ? dt->fs_file : "",
                      dtwalk->dd_level,
                      date);
      }
}

int
datesort(a1, a2)
      const void *a1, *a2;
{
      struct dumpdates *d1 = *(struct dumpdates **)a1;
      struct dumpdates *d2 = *(struct dumpdates **)a2;
      int diff;

      diff = strncmp(d1->dd_name, d2->dd_name, sizeof(d1->dd_name));
      if (diff == 0)
            return (d2->dd_ddate - d1->dd_ddate);
      return (diff);
}

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