Date: Sun, 15 Dec 1996 15:31:55 +0100 (MET) From: J Wunsch <j@uriah.heep.sax.de> To: freebsd-current@FreeBSD.org (FreeBSD-current users) Subject: cvt-wtmp Message-ID: <199612151431.PAA24147@uriah.heep.sax.de>
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--ELM850660315-20318-0_ Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit For the curious, here is it. I'm still awaiting Jordan's proposal on the upgrade suite framework :), but since i'm afraid this will take quite a bit longer to complete, and people need to convert their wtmp's right now, i wrote the tool. (Yes, i've just upgraded my machine, or what do you believe why i wrote it? :) I might check it into CVS under tools/ until the upgrade framework is ready for prime-time. Objections? (If it's only in -current, but not in 2.2, it won't get a CVS tag anytime soon, so we could even repository copy it later.) -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-) --ELM850660315-20318-0_ Content-Type: text/plain Content-Disposition: attachment; filename=cvt-wtmp.c Content-Description: /tmp/cvt-wtmp.c Content-Transfer-Encoding: 7bit /* * 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. */ /* * 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); /* * NB: We cannot convert lastlog yet, but we don't need either. */ void usage(void) { errx(EX_USAGE, "usage: cvt-wtmp [-n] /var/log/wtmp*"); } int main(int argc, char **argv) { int errs, i, nflag, rv; errs = nflag = 0; while ((i = getopt(argc, argv, "n")) != EOF) switch (i) { case 'n': nflag++; break; default: errs++; } argc -= optind; argv += optind; if (argc <= 0 || errs) usage(); for (;argc > 0; argc--, argv++) convert(*argv, nflag); return 0; } void convert(const char *name, int nflag) { 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; int old, new; time_t now, early, t; struct tm tm; struct utmp u; struct outmp *ou; 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; while (read(fd2, &buf[off], sizeof(time_t)) == sizeof(time_t)) { t = *((time_t *)&buf[off]); off += sizeof(time_t); if (t < early || t > now) { /* unreasonable, collect another entry */ if (off > sizeof buf) { (void) unlink(xname); errx(EX_UNAVAILABLE, "I can't seem to make sense out of file \"%s\"", name); } continue; } /* time is reasonable, we seem to have collected a full entry */ if (off == sizeof(struct utmp)) { /* new wtmp record */ 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 */ 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 (off < sizeof(struct outmp)) /* try again */ continue; warnx("Illegal record in file \"%s\", ignoring.", name); off = 0; continue; } off = 0; } close(fd2); /* * Since the wtmp file is chronologically increasing, we can move * the `early' time as we go. Allow for one hour time-of-day * adjustments. */ early = t - 3600; 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); } --ELM850660315-20318-0_--
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