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sel_subs.c

/*    $OpenBSD: sel_subs.c,v 1.7 1997/08/17 23:05:09 millert Exp $      */
/*    $NetBSD: sel_subs.c,v 1.5 1995/03/21 09:07:42 cgd Exp $     */

/*-
 * Copyright (c) 1992 Keith Muller.
 * Copyright (c) 1992, 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Keith Muller of the University of California, San Diego.
 *
 * 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.
 */

#ifndef lint
#if 0
static char sccsid[] = "@(#)sel_subs.c    8.1 (Berkeley) 5/31/93";
#else
static char rcsid[] = "$OpenBSD: sel_subs.c,v 1.7 1997/08/17 23:05:09 millert Exp $";
#endif
#endif /* not lint */

#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <pwd.h>
#include <grp.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include "pax.h"
#include "sel_subs.h"
#include "extern.h"

static int str_sec __P((register char *, time_t *));
static int usr_match __P((register ARCHD *));
static int grp_match __P((register ARCHD *));
static int trng_match __P((register ARCHD *));

static TIME_RNG *trhead = NULL;           /* time range list head */
static TIME_RNG *trtail = NULL;           /* time range list tail */
static USRT **usrtb = NULL;         /* user selection table */
static GRPT **grptb = NULL;         /* group selection table */

/*
 * Routines for selection of archive members
 */

/*
 * sel_chk()
 *    check if this file matches a specfied uid, gid or time range
 * Return:
 *    0 if this archive member should be processed, 1 if it should be skipped
 */

#ifdef __STDC__
int
sel_chk(register ARCHD *arcn)
#else
int
sel_chk(arcn)
      register ARCHD *arcn;
#endif
{
      if (((usrtb != NULL) && usr_match(arcn)) ||
          ((grptb != NULL) && grp_match(arcn)) ||
          ((trhead != NULL) && trng_match(arcn)))
            return(1);
      return(0);
}

/*
 * User/group selection routines
 *
 * Routines to handle user selection of files based on the file uid/gid. To
 * add an entry, the user supplies either then name or the uid/gid starting with
 * a # on the command line. A \# will eascape the #.
 */

/*
 * usr_add()
 *    add a user match to the user match hash table
 * Return:
 *    0 if added ok, -1 otherwise;
 */

#ifdef __STDC__
int
usr_add(register char *str)
#else
int
usr_add(str)
      register char *str;
#endif
{
      register u_int indx;
      register USRT *pt;
      register struct passwd *pw;
      register uid_t uid;

      /*
       * create the table if it doesn't exist
       */
      if ((str == NULL) || (*str == '\0'))
            return(-1);
      if ((usrtb == NULL) &&
          ((usrtb = (USRT **)calloc(USR_TB_SZ, sizeof(USRT *))) == NULL)) {
            paxwarn(1, "Unable to allocate memory for user selection table");
            return(-1);
      }

      /*
       * figure out user spec
       */
      if (str[0] != '#') {
            /*
             * it is a user name, \# escapes # as first char in user name
             */
            if ((str[0] == '\\') && (str[1] == '#'))
                  ++str;
            if ((pw = getpwnam(str)) == NULL) {
                  paxwarn(1, "Unable to find uid for user: %s", str);
                  return(-1);
            }
            uid = (uid_t)pw->pw_uid;
      } else
#           ifdef NET2_STAT
            uid = (uid_t)atoi(str+1);
#           else
            uid = (uid_t)strtoul(str+1, NULL, 10);
#           endif
      endpwent();

      /*
       * hash it and go down the hash chain (if any) looking for it
       */
      indx = ((unsigned)uid) % USR_TB_SZ;
      if ((pt = usrtb[indx]) != NULL) {
            while (pt != NULL) {
                  if (pt->uid == uid)
                        return(0);
                  pt = pt->fow;
            }
      }

      /*
       * uid is not yet in the table, add it to the front of the chain
       */
      if ((pt = (USRT *)malloc(sizeof(USRT))) != NULL) {
            pt->uid = uid;
            pt->fow = usrtb[indx];
            usrtb[indx] = pt;
            return(0);
      }
      paxwarn(1, "User selection table out of memory");
      return(-1);
}

/*
 * usr_match()
 *    check if this files uid matches a selected uid.
 * Return:
 *    0 if this archive member should be processed, 1 if it should be skipped
 */

#ifdef __STDC__
static int
usr_match(register ARCHD *arcn)
#else
static int
usr_match(arcn)
      register ARCHD *arcn;
#endif
{
      register USRT *pt;

      /*
       * hash and look for it in the table
       */
      pt = usrtb[((unsigned)arcn->sb.st_uid) % USR_TB_SZ];
      while (pt != NULL) {
            if (pt->uid == arcn->sb.st_uid)
                  return(0);
            pt = pt->fow;
      }

      /*
       * not found
       */
      return(1);
}

/*
 * grp_add()
 *    add a group match to the group match hash table
 * Return:
 *    0 if added ok, -1 otherwise;
 */

#ifdef __STDC__
int
grp_add(register char *str)
#else
int
grp_add(str)
      register char *str;
#endif
{
      register u_int indx;
      register GRPT *pt;
      register struct group *gr;
      register gid_t gid;

      /*
       * create the table if it doesn't exist
       */
      if ((str == NULL) || (*str == '\0'))
            return(-1);
      if ((grptb == NULL) &&
          ((grptb = (GRPT **)calloc(GRP_TB_SZ, sizeof(GRPT *))) == NULL)) {
            paxwarn(1, "Unable to allocate memory fo group selection table");
            return(-1);
      }

      /*
       * figure out user spec
       */
      if (str[0] != '#') {
            /*
             * it is a group name, \# escapes # as first char in group name
             */
            if ((str[0] == '\\') && (str[1] == '#'))
                  ++str;
            if ((gr = getgrnam(str)) == NULL) {
                  paxwarn(1,"Cannot determine gid for group name: %s", str);
                  return(-1);
            }
            gid = (gid_t)gr->gr_gid;
      } else
#           ifdef NET2_STAT
            gid = (gid_t)atoi(str+1);
#           else
            gid = (gid_t)strtoul(str+1, NULL, 10);
#           endif
      endgrent();

      /*
       * hash it and go down the hash chain (if any) looking for it
       */
      indx = ((unsigned)gid) % GRP_TB_SZ;
      if ((pt = grptb[indx]) != NULL) {
            while (pt != NULL) {
                  if (pt->gid == gid)
                        return(0);
                  pt = pt->fow;
            }
      }

      /*
       * gid not in the table, add it to the front of the chain
       */
      if ((pt = (GRPT *)malloc(sizeof(GRPT))) != NULL) {
            pt->gid = gid;
            pt->fow = grptb[indx];
            grptb[indx] = pt;
            return(0);
      }
      paxwarn(1, "Group selection table out of memory");
      return(-1);
}

/*
 * grp_match()
 *    check if this files gid matches a selected gid.
 * Return:
 *    0 if this archive member should be processed, 1 if it should be skipped
 */

#ifdef __STDC__
static int
grp_match(register ARCHD *arcn)
#else
static int
grp_match(arcn)
      register ARCHD *arcn;
#endif
{
      register GRPT *pt;

      /*
       * hash and look for it in the table
       */
      pt = grptb[((unsigned)arcn->sb.st_gid) % GRP_TB_SZ];
      while (pt != NULL) {
            if (pt->gid == arcn->sb.st_gid)
                  return(0);
            pt = pt->fow;
      }

      /*
       * not found
       */
      return(1);
}

/*
 * Time range selection routines
 *
 * Routines to handle user selection of files based on the modification and/or
 * inode change time falling within a specified time range (the non-standard
 * -T flag). The user may specify any number of different file time ranges.
 * Time ranges are checked one at a time until a match is found (if at all).
 * If the file has a mtime (and/or ctime) which lies within one of the time
 * ranges, the file is selected. Time ranges may have a lower and/or a upper
 * value. These ranges are inclusive. When no time ranges are supplied to pax
 * with the -T option, all members in the archive will be selected by the time
 * range routines. When only a lower range is supplied, only files with a
 * mtime (and/or ctime) equal to or younger are selected. When only a upper
 * range is supplied, only files with a mtime (and/or ctime) equal to or older
 * are selected. When the lower time range is equal to the upper time range,
 * only files with a mtime (or ctime) of exactly that time are selected.
 */

/*
 * trng_add()
 *    add a time range match to the time range list.
 *    This is a non-standard pax option. Lower and upper ranges are in the
 *    format: [yy[mm[dd[hh]]]]mm[.ss] and are comma separated.
 *    Time ranges are based on current time, so 1234 would specify a time of
 *    12:34 today.
 * Return:
 *    0 if the time range was added to the list, -1 otherwise
 */

#ifdef __STDC__
int
trng_add(register char *str)
#else
int
trng_add(str)
      register char *str;
#endif
{
      register TIME_RNG *pt;
      register char *up_pt = NULL;
      register char *stpt;
      register char *flgpt;
      register int dot = 0;

      /*
       * throw out the badly formed time ranges
       */
      if ((str == NULL) || (*str == '\0')) {
            paxwarn(1, "Empty time range string");
            return(-1);
      }

      /*
       * locate optional flags suffix /{cm}.
       */
      if ((flgpt = strrchr(str, '/')) != NULL)
            *flgpt++ = '\0';

      for (stpt = str; *stpt != '\0'; ++stpt) {
            if ((*stpt >= '0') && (*stpt <= '9'))
                  continue;
            if ((*stpt == ',') && (up_pt == NULL)) {
                  *stpt = '\0';
                  up_pt = stpt + 1;
                  dot = 0;
                  continue;
            }

            /*
             * allow only one dot per range (secs)
             */
            if ((*stpt == '.') && (!dot)) {
                  ++dot;
                  continue;
            }
            paxwarn(1, "Improperly specified time range: %s", str);
            goto out;
      }

      /*
       * allocate space for the time range and store the limits
       */
      if ((pt = (TIME_RNG *)malloc(sizeof(TIME_RNG))) == NULL) {
            paxwarn(1, "Unable to allocate memory for time range");
            return(-1);
      }

      /*
       * by default we only will check file mtime, but usee can specify
       * mtime, ctime (inode change time) or both.
       */
      if ((flgpt == NULL) || (*flgpt == '\0'))
            pt->flgs = CMPMTME;
      else {
            pt->flgs = 0;
            while (*flgpt != '\0') {
                  switch(*flgpt) {
                  case 'M':
                  case 'm':
                        pt->flgs |= CMPMTME;
                        break;
                  case 'C':
                  case 'c':
                        pt->flgs |= CMPCTME;
                        break;
                  default:
                        paxwarn(1, "Bad option %c with time range %s",
                            *flgpt, str);
                        goto out;
                  }
                  ++flgpt;
            }
      }

      /*
       * start off with the current time
       */
      pt->low_time = pt->high_time = time(NULL);
      if (*str != '\0') {
            /*
             * add lower limit
             */
            if (str_sec(str, &(pt->low_time)) < 0) {
                  paxwarn(1, "Illegal lower time range %s", str);
                  (void)free((char *)pt);
                  goto out;
            }
            pt->flgs |= HASLOW;
      }

      if ((up_pt != NULL) && (*up_pt != '\0')) {
            /*
             * add upper limit
             */
            if (str_sec(up_pt, &(pt->high_time)) < 0) {
                  paxwarn(1, "Illegal upper time range %s", up_pt);
                  (void)free((char *)pt);
                  goto out;
            }
            pt->flgs |= HASHIGH;

            /*
             * check that the upper and lower do not overlap
             */
            if (pt->flgs & HASLOW) {
                  if (pt->low_time > pt->high_time) {
                        paxwarn(1, "Upper %s and lower %s time overlap",
                              up_pt, str);
                        (void)free((char *)pt);
                        return(-1);
                  }
            }
      }

      pt->fow = NULL;
      if (trhead == NULL) {
            trtail = trhead = pt;
            return(0);
      }
      trtail->fow = pt;
      trtail = pt;
      return(0);

    out:
      paxwarn(1, "Time range format is: [yy[mm[dd[hh]]]]mm[.ss][/[c][m]]");
      return(-1);
}

/*
 * trng_match()
 *    check if this files mtime/ctime falls within any supplied time range.
 * Return:
 *    0 if this archive member should be processed, 1 if it should be skipped
 */

#ifdef __STDC__
static int
trng_match(register ARCHD *arcn)
#else
static int
trng_match(arcn)
      register ARCHD *arcn;
#endif
{
      register TIME_RNG *pt;

      /*
       * have to search down the list one at a time looking for a match.
       * remember time range limits are inclusive.
       */
      pt = trhead;
      while (pt != NULL) {
            switch(pt->flgs & CMPBOTH) {
            case CMPBOTH:
                  /*
                   * user wants both mtime and ctime checked for this
                   * time range
                   */
                  if (((pt->flgs & HASLOW) &&
                      (arcn->sb.st_mtime < pt->low_time) &&
                      (arcn->sb.st_ctime < pt->low_time)) ||
                      ((pt->flgs & HASHIGH) &&
                      (arcn->sb.st_mtime > pt->high_time) &&
                      (arcn->sb.st_ctime > pt->high_time))) {
                        pt = pt->fow;
                        continue;
                  }
                  break;
            case CMPCTME:
                  /*
                   * user wants only ctime checked for this time range
                   */
                  if (((pt->flgs & HASLOW) &&
                      (arcn->sb.st_ctime < pt->low_time)) ||
                      ((pt->flgs & HASHIGH) &&
                      (arcn->sb.st_ctime > pt->high_time))) {
                        pt = pt->fow;
                        continue;
                  }
                  break;
            case CMPMTME:
            default:
                  /*
                   * user wants only mtime checked for this time range
                   */
                  if (((pt->flgs & HASLOW) &&
                      (arcn->sb.st_mtime < pt->low_time)) ||
                      ((pt->flgs & HASHIGH) &&
                      (arcn->sb.st_mtime > pt->high_time))) {
                        pt = pt->fow;
                        continue;
                  }
                  break;
            }
            break;
      }

      if (pt == NULL)
            return(1);
      return(0);
}

/*
 * str_sec()
 *    Convert a time string in the format of [yy[mm[dd[hh]]]]mm[.ss] to gmt
 *    seconds. Tval already has current time loaded into it at entry.
 * Return:
 *    0 if converted ok, -1 otherwise
 */

#ifdef __STDC__
static int
str_sec(register char *str, time_t *tval)
#else
static int
str_sec(str, tval)
      register char *str;
      time_t *tval;
#endif
{
      register struct tm *lt;
      register char *dot = NULL;

      lt = localtime(tval);
      if ((dot = strchr(str, '.')) != NULL) {
            /*
             * seconds (.ss)
             */
            *dot++ = '\0';
            if (strlen(dot) != 2)
                  return(-1);
            if ((lt->tm_sec = ATOI2(dot)) > 61)
                  return(-1);
      } else
            lt->tm_sec = 0;

      switch (strlen(str)) {
      case 10:
            /*
             * year (yy)
             * watch out for year 2000
             */
            if ((lt->tm_year = ATOI2(str)) < 69)
                  lt->tm_year += 100;
            str += 2;
            /* FALLTHROUGH */
      case 8:
            /*
             * month (mm)
             * watch out months are from 0 - 11 internally
             */
            if ((lt->tm_mon = ATOI2(str)) > 12)
                  return(-1);
            --lt->tm_mon;
            str += 2;
            /* FALLTHROUGH */
      case 6:
            /*
             * day (dd)
             */
            if ((lt->tm_mday = ATOI2(str)) > 31)
                  return(-1);
            str += 2;
            /* FALLTHROUGH */
      case 4:
            /*
             * hour (hh)
             */
            if ((lt->tm_hour = ATOI2(str)) > 23)
                  return(-1);
            str += 2;
            /* FALLTHROUGH */
      case 2:
            /*
             * minute (mm)
             */
            if ((lt->tm_min = ATOI2(str)) > 59)
                  return(-1);
            break;
      default:
            return(-1);
      }
      /*
       * convert broken-down time to GMT clock time seconds
       */
      if ((*tval = mktime(lt)) == -1)
            return(-1);
      return(0);
}

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