285 lines
7.1 KiB
C
285 lines
7.1 KiB
C
/*
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* Copyright (c) 1996 Joerg Wunsch
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id$
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*
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*/
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/*
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* Heuristics to convert old wtmp format to new one.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <err.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <unistd.h>
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#include <utmp.h>
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#define OUT_NAMESIZE 8
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#define OUT_LINESIZE 8
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#define OUT_HOSTSIZE 16
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struct olastlog {
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time_t ll_time;
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char ll_line[OUT_LINESIZE];
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char ll_host[OUT_HOSTSIZE];
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};
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struct outmp {
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char ut_line[OUT_LINESIZE];
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char ut_name[OUT_NAMESIZE];
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char ut_host[OUT_HOSTSIZE];
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long ut_time;
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};
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void usage(void);
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void convert(const char *, int, int);
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/*
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* NB: We cannot convert lastlog yet, but we don't need either.
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*/
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void
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usage(void)
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{
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errx(EX_USAGE, "usage: cvt-wtmp [-f] [-n] /var/log/wtmp*");
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}
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int
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main(int argc, char **argv)
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{
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int errs, i, nflag, forceflag, rv;
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errs = nflag = forceflag = 0;
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while ((i = getopt(argc, argv, "fn")) != EOF)
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switch (i)
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{
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case 'f':
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forceflag++;
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break;
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case 'n':
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nflag++;
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break;
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default:
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errs++;
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}
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argc -= optind;
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argv += optind;
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if (argc <= 0 || errs)
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usage();
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for (;argc > 0; argc--, argv++)
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convert(*argv, nflag, forceflag);
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return 0;
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}
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void
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convert(const char *name, int nflag, int forceflag)
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{
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struct stat sb;
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struct timeval tv[2];
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char xname[1024], yname[1024];
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unsigned char buf[128]; /* large enough to hold one wtmp record */
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int fd1, fd2;
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size_t off, shouldbe;
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int old, new;
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time_t now, early, *t;
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struct tm tm;
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struct utmp u;
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struct outmp *ou;
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enum { OLD, NEW } which = OLD; /* what we're defaulting to */
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if (stat(name, &sb) == -1)
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{
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warn("Cannot stat file \"%s\", continuing.", name);
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return;
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}
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now = time(NULL);
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/* some point in time very early, before 386BSD 0.0 */
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tm.tm_sec = 0; tm.tm_min = 0; tm.tm_hour = 0;
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tm.tm_mday = 1; tm.tm_mon = 2; tm.tm_year = 92;
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tm.tm_isdst = 0;
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early = mktime(&tm);
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tv[0].tv_sec = sb.st_atimespec.tv_sec;
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tv[0].tv_usec = sb.st_atimespec.tv_nsec / 1000;
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tv[1].tv_sec = sb.st_mtimespec.tv_sec;
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tv[1].tv_usec = sb.st_mtimespec.tv_nsec / 1000;
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/* unzipping is handled best externally */
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if (strlen(name) > 3 && memcmp(&name[strlen(name) - 3], ".gz", 3) == 0)
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{
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warnx("Cannot handle gzipped files, ignoring \"%s\".", name);
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return;
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}
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(void) snprintf(xname, sizeof xname, "%s.new", name);
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if (!nflag && (fd1 = open(xname, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1)
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err(EX_CANTCREAT, "Can't create new wtmp file");
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if ((fd2 = open(name, O_RDONLY, 0)) == -1)
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err(EX_UNAVAILABLE, "input file magically disappeared, i'm confused");
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old = new = 0; off = 0;
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memset(buf, 0, sizeof buf);
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while (read(fd2, &buf[off], sizeof(time_t)) == sizeof(time_t))
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{
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t = (time_t *)&buf[off];
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off += sizeof(time_t);
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if (off < sizeof(struct outmp))
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/* go on */
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continue;
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if (*t < early || *t > now)
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{
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/* unreasonable, collect another entry */
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if (off > sizeof buf)
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{
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if (!forceflag)
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{
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(void) unlink(xname);
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errx(EX_UNAVAILABLE, "I can't seem to make sense out of file \"%s\",\n"
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"Could have forced using -f.",
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name);
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}
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else
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{
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warnx("Record # %d in file \"%s\" seems bogus\n"
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"(time: %d, previous time: %d, now: %d),\n"
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"continuing anyway.",
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old + new + 1, name, *t, early, now);
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if (which == NEW)
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{
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(void)lseek(fd2, sizeof(struct utmp) - sizeof buf, SEEK_CUR);
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goto write_new;
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}
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else
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{
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(void)lseek(fd2, sizeof(struct outmp) - sizeof buf, SEEK_CUR);
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goto write_old;
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}
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}
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}
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continue;
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}
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/* time is reasonable, we seem to have collected a full entry */
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if (off == sizeof(struct utmp))
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{
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/* new wtmp record */
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which = NEW;
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write_new:
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new++;
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if (!nflag)
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{
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if (write(fd1, buf, sizeof(struct utmp)) != sizeof(struct utmp))
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err(EX_IOERR, "writing file \"%s\"", xname);
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}
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}
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else if (off == sizeof(struct outmp))
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{
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/* old fart */
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which = OLD;
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write_old:
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old++;
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if (!nflag)
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{
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ou = (struct outmp *)buf;
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memset(&u, 0, sizeof u);
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memcpy(&u.ut_line, ou->ut_line, OUT_LINESIZE);
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memcpy(&u.ut_name, ou->ut_name, OUT_NAMESIZE);
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memcpy(&u.ut_host, ou->ut_host, OUT_HOSTSIZE);
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memcpy(&u.ut_time, &ou->ut_time, sizeof u.ut_time);
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if (write(fd1, &u, sizeof(struct utmp)) != sizeof(struct utmp))
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err(EX_IOERR, "writing file \"%s\"", xname);
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}
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}
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else
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{
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if (!forceflag)
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{
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warnx("Illegal record in file \"%s\", ignoring.", name);
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off = 0;
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continue;
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}
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else
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{
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warnx("Illegal record in file \"%s\", considering it %s one.",
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name, (which == OLD? "an old": "a new"));
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shouldbe = (which == OLD? sizeof(struct outmp): sizeof(struct utmp));
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if (off < shouldbe)
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(void)read(fd2, &buf[off], shouldbe - off);
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else
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(void)lseek(fd2, shouldbe - off, SEEK_CUR);
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if (which == OLD)
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goto write_old;
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else
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goto write_new;
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}
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}
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off = 0;
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/*
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* Since the wtmp file is in chronologically acsending order, we
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* can move the `early' time as we go. Allow for one hour
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* time-of-day adjustments.
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*/
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early = *t - 3600;
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memset(buf, 0, sizeof buf);
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}
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close(fd2);
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printf("File \"%s\": %d old and %d new records found.\n",
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name, old, new);
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if (nflag)
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return;
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(void) close(fd1);
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(void) snprintf(yname, sizeof yname, "%s.bak", name);
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if (rename(name, yname) == -1)
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err(EX_OSERR, "Cannot rename \"%s\" to \"%s\"", name, yname);
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if (rename(xname, name) == -1)
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err(EX_OSERR, "Cannot rename \"%s\" to \"%s\"", xname, name);
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if (utimes(name, tv) == -1)
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warn("Cannot adjust access and modification times for \"%s\"", name);
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}
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