/* $NetBSD: sel_subs.c,v 1.24 2011/08/31 16:24:54 plunky 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. 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.
*/
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
#if !defined(lint)
#if 0
static char sccsid[] = "@(#)sel_subs.c 8.1 (Berkeley) 5/31/93";
#else
__RCSID("$NetBSD: sel_subs.c,v 1.24 2011/08/31 16:24:54 plunky 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 <ctype.h>
#include <string.h>
#include <strings.h>
#include <time.h>
#include <unistd.h>
#include <stdlib.h>
#include <tzfile.h>
#include "pax.h"
#include "sel_subs.h"
#include "extern.h"
static int str_sec(const char *, time_t *);
static int usr_match(ARCHD *);
static int grp_match(ARCHD *);
static int trng_match(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 specified uid, gid or time range
* Return:
* 0 if this archive member should be processed, 1 if it should be skipped
*/
int
sel_chk(ARCHD *arcn)
{
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 the name or the uid/gid starting with
* a # on the command line. A \# will escape the #.
*/
/*
* usr_add()
* add a user match to the user match hash table
* Return:
* 0 if added ok, -1 otherwise;
*/
int
usr_add(char *str)
{
u_int indx;
USRT *pt;
struct passwd *pw;
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)) {
tty_warn(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) {
tty_warn(1, "Unable to find uid for user: %s", str);
return -1;
}
uid = (uid_t)pw->pw_uid;
} else
uid = (uid_t)strtoul(str+1, NULL, 10);
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;
}
tty_warn(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
*/
static int
usr_match(ARCHD *arcn)
{
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;
*/
int
grp_add(char *str)
{
u_int indx;
GRPT *pt;
struct group *gr;
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)) {
tty_warn(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) {
tty_warn(1,
"Cannot determine gid for group name: %s", str);
return -1;
}
gid = (gid_t)gr->gr_gid;
} else
gid = (gid_t)strtoul(str+1, NULL, 10);
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;
}
tty_warn(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
*/
static int
grp_match(ARCHD *arcn)
{
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
*/
int
trng_add(char *str)
{
TIME_RNG *pt;
char *up_pt = NULL;
char *stpt;
char *flgpt;
int dot = 0;
/*
* throw out the badly formed time ranges
*/
if ((str == NULL) || (*str == '\0')) {
tty_warn(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;
}
tty_warn(1, "Improperly specified time range: %s", str);
goto out;
}
/*
* allocate space for the time range and store the limits
*/
if ((pt = malloc(sizeof(TIME_RNG))) == NULL) {
tty_warn(1, "Unable to allocate memory for time range");
return -1;
}
/*
* by default we only will check file mtime, but user 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:
tty_warn(1, "Bad option %c with time range %s",
*flgpt, str);
free(pt);
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) {
tty_warn(1, "Illegal lower time range %s", str);
free(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) {
tty_warn(1, "Illegal upper time range %s", up_pt);
free(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) {
tty_warn(1,
"Upper %s and lower %s time overlap",
up_pt, str);
free(pt);
return -1;
}
}
}
pt->fow = NULL;
if (trhead == NULL) {
trtail = trhead = pt;
return 0;
}
trtail->fow = pt;
trtail = pt;
return 0;
out:
tty_warn(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
*/
static int
trng_match(ARCHD *arcn)
{
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
*/
#define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
static int
str_sec(const char *p, time_t *tval)
{
struct tm *lt;
const char *dot, *t;
int yearset, len;
for (t = p, dot = NULL; *t; ++t) {
if (isdigit((unsigned char)*t))
continue;
if (*t == '.' && dot == NULL) {
dot = t;
continue;
}
return -1;
}
lt = localtime(tval);
if (dot != NULL) {
len = strlen(dot);
if (len != 3)
return -1;
++dot;
lt->tm_sec = ATOI2(dot);
} else {
len = 0;
lt->tm_sec = 0;
}
yearset = 0;
switch (strlen(p) - len) {
case 12:
lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE;
yearset = 1;
/* FALLTHROUGH */
case 10:
if (yearset) {
lt->tm_year += ATOI2(p);
} else {
yearset = ATOI2(p);
if (yearset < 69)
lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
else
lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
}
/* FALLTHROUGH */
case 8:
lt->tm_mon = ATOI2(p);
--lt->tm_mon;
/* FALLTHROUGH */
case 6:
lt->tm_mday = ATOI2(p);
/* FALLTHROUGH */
case 4:
lt->tm_hour = ATOI2(p);
/* FALLTHROUGH */
case 2:
lt->tm_min = ATOI2(p);
break;
default:
return -1;
}
/*
* convert broken-down time to GMT clock time seconds
*/
if ((*tval = mktime(lt)) == -1)
return -1;
return 0;
}
