/*
* Copyright (c) 1996 Joerg Wunsch
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``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 DEVELOPERS 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.
*
* $FreeBSD$
*
*/
/*
* Heuristics to convert old wtmp format to new one.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#include <utmp.h>
#define OUT_NAMESIZE 8
#define OUT_LINESIZE 8
#define OUT_HOSTSIZE 16
struct olastlog {
time_t ll_time;
char ll_line[OUT_LINESIZE];
char ll_host[OUT_HOSTSIZE];
};
struct outmp {
char ut_line[OUT_LINESIZE];
char ut_name[OUT_NAMESIZE];
char ut_host[OUT_HOSTSIZE];
long ut_time;
};
void usage(void);
void convert(const char *, int, int);
/*
* NB: We cannot convert lastlog yet, but we don't need either.
*/
void
usage(void)
{
errx(EX_USAGE, "usage: cvt-wtmp [-f] [-n] /var/log/wtmp*");
}
int
main(int argc, char **argv)
{
int errs, i, nflag, forceflag, rv;
errs = nflag = forceflag = 0;
while ((i = getopt(argc, argv, "fn")) != -1)
switch (i)
{
case 'f':
forceflag++;
break;
case 'n':
nflag++;
break;
default:
errs++;
}
argc -= optind;
argv += optind;
if (argc <= 0 || errs)
usage();
for (;argc > 0; argc--, argv++)
convert(*argv, nflag, forceflag);
return 0;
}
void
convert(const char *name, int nflag, int forceflag)
{
struct stat sb;
struct timeval tv[2];
char xname[1024], yname[1024];
unsigned char buf[128]; /* large enough to hold one wtmp record */
int fd1, fd2;
size_t off, shouldbe;
int old, new;
time_t now, early, *t;
struct tm tm;
struct utmp u;
struct outmp *ou;
enum { OLD, NEW } which = OLD; /* what we're defaulting to */
if (stat(name, &sb) == -1)
{
warn("Cannot stat file \"%s\", continuing.", name);
return;
}
now = time(NULL);
/* some point in time very early, before 386BSD 0.0 */
tm.tm_sec = 0; tm.tm_min = 0; tm.tm_hour = 0;
tm.tm_mday = 1; tm.tm_mon = 2; tm.tm_year = 92;
tm.tm_isdst = 0;
early = mktime(&tm);
tv[0].tv_sec = sb.st_atimespec.tv_sec;
tv[0].tv_usec = sb.st_atimespec.tv_nsec / 1000;
tv[1].tv_sec = sb.st_mtimespec.tv_sec;
tv[1].tv_usec = sb.st_mtimespec.tv_nsec / 1000;
/* unzipping is handled best externally */
if (strlen(name) > 3 && memcmp(&name[strlen(name) - 3], ".gz", 3) == 0)
{
warnx("Cannot handle gzipped files, ignoring \"%s\".", name);
return;
}
(void) snprintf(xname, sizeof xname, "%s.new", name);
if (!nflag && (fd1 = open(xname, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1)
err(EX_CANTCREAT, "Can't create new wtmp file");
if ((fd2 = open(name, O_RDONLY, 0)) == -1)
err(EX_UNAVAILABLE, "input file magically disappeared, i'm confused");
old = new = 0; off = 0;
memset(buf, 0, sizeof buf);
while (read(fd2, &buf[off], sizeof(time_t)) == sizeof(time_t))
{
t = (time_t *)&buf[off];
off += sizeof(time_t);
if (off < sizeof(struct outmp))
/* go on */
continue;
if (*t < early || *t > now)
{
/* unreasonable, collect another entry */
if (off > sizeof buf)
{
if (!forceflag)
{
(void) unlink(xname);
errx(EX_UNAVAILABLE, "I can't seem to make sense out of file \"%s\",\n"
"Could have forced using -f.",
name);
}
else
{
warnx("Record # %d in file \"%s\" seems bogus\n"
"(time: %d, previous time: %d, now: %d),\n"
"continuing anyway.",
old + new + 1, name, *t, early, now);
if (which == NEW)
{
(void)lseek(fd2, sizeof(struct utmp) - sizeof buf, SEEK_CUR);
goto write_new;
}
else
{
(void)lseek(fd2, sizeof(struct outmp) - sizeof buf, SEEK_CUR);
goto write_old;
}
}
}
continue;
}
/* time is reasonable, we seem to have collected a full entry */
if (off == sizeof(struct utmp))
{
/* new wtmp record */
which = NEW;
write_new:
new++;
if (!nflag)
{
if (write(fd1, buf, sizeof(struct utmp)) != sizeof(struct utmp))
err(EX_IOERR, "writing file \"%s\"", xname);
}
}
else if (off == sizeof(struct outmp))
{
/* old fart */
which = OLD;
write_old:
old++;
if (!nflag)
{
ou = (struct outmp *)buf;
memset(&u, 0, sizeof u);
memcpy(&u.ut_line, ou->ut_line, OUT_LINESIZE);
memcpy(&u.ut_name, ou->ut_name, OUT_NAMESIZE);
memcpy(&u.ut_host, ou->ut_host, OUT_HOSTSIZE);
memcpy(&u.ut_time, &ou->ut_time, sizeof u.ut_time);
if (write(fd1, &u, sizeof(struct utmp)) != sizeof(struct utmp))
err(EX_IOERR, "writing file \"%s\"", xname);
}
}
else
{
if (!forceflag)
{
warnx("Illegal record in file \"%s\", ignoring.", name);
off = 0;
continue;
}
else
{
warnx("Illegal record in file \"%s\", considering it %s one.",
name, (which == OLD? "an old": "a new"));
shouldbe = (which == OLD? sizeof(struct outmp): sizeof(struct utmp));
if (off < shouldbe)
(void)read(fd2, &buf[off], shouldbe - off);
else
(void)lseek(fd2, shouldbe - off, SEEK_CUR);
if (which == OLD)
goto write_old;
else
goto write_new;
}
}
off = 0;
/*
* Since the wtmp file is in chronologically acsending order, we
* can move the `early' time as we go. Allow for one hour
* time-of-day adjustments.
*/
early = *t - 3600;
memset(buf, 0, sizeof buf);
}
close(fd2);
printf("File \"%s\": %d old and %d new records found.\n",
name, old, new);
if (nflag)
return;
(void) close(fd1);
(void) snprintf(yname, sizeof yname, "%s.bak", name);
if (rename(name, yname) == -1)
err(EX_OSERR, "Cannot rename \"%s\" to \"%s\"", name, yname);
if (rename(xname, name) == -1)
err(EX_OSERR, "Cannot rename \"%s\" to \"%s\"", xname, name);
if (utimes(name, tv) == -1)
warn("Cannot adjust access and modification times for \"%s\"", name);
}
