src/last.c

/*
 * last.c	Re-implementation of the 'last' command, this time
 *		for Linux. Yes I know there is BSD last, but I
 *		just felt like writing this. No thanks :-).
 *		Also, this version gives lots more info (especially with -x)
 *
 * Author:	Miquel van Smoorenburg, miquels@cistron.nl
 *
 * Version:	@(#)last  2.85  30-Jul-2004  miquels@cistron.nl
 *
 *		This file is part of the sysvinit suite,
 *		Copyright 1991-2004 Miquel van Smoorenburg.
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/fcntl.h>
#include <time.h>
#include <stdio.h>
#include <ctype.h>
#include <utmpx.h>
#include <errno.h>
//#include <malloc.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <getopt.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include "oldutmp.h"
#include <sys/param.h>
#include "paths.h"

#ifndef SHUTDOWN_TIME
#  define SHUTDOWN_TIME 254
#endif

#ifdef __INTERIX
#define fseeko fseek
#define ftello ftell
#endif

#if defined __INTERIX || defined __FreeBSD__
#ifndef RUN_LVL
#ifdef EMPTY
#define RUN_LVL EMPTY
#else
#define RUN_LVL 0
#endif
#endif		/* !RUN_LVL */
#endif

#if !defined ut_time && !defined __CYGWIN__
#define ut_time ut_tv.tv_sec
#endif

char *Version = "@(#) last 2.85 31-Apr-2004 miquels";

#define CHOP_DOMAIN	0	/* Define to chop off local domainname. */
#define NEW_UTMP	1	/* Fancy & fast utmp read code. */
#define UCHUNKSIZE	16384	/* How much we read at once. */

/* Double linked list of struct utmp's */
struct utmplist {
  struct utmpx ut;
  struct utmplist *next;
  struct utmplist *prev;
};
struct utmplist *utmplist = NULL;

/* Types of listing */
#define R_CRASH		1 /* No logout record, system boot in between */
#define R_DOWN		2 /* System brought down in decent way */
#define R_NORMAL	3 /* Normal */
#define R_NOW		4 /* Still logged in */
#define R_REBOOT	5 /* Reboot record. */
#define R_PHANTOM	6 /* No logout record but session is stale. */
#define R_TIMECHANGE	7 /* NEW_TIME or OLD_TIME */

/* Global variables */
int maxrecs = 0;	/* Maximum number of records to list. */
int recsdone = 0;	/* Number of records listed */
int showhost = 1;	/* Show hostname too? */
int altlist = 0;	/* Show hostname at the end. */
int usedns = 0;		/* Use DNS to lookup the hostname. */
int useip = 0;		/* Print IP address in number format */
int fulltime = 0;	/* Print full dates and times */
int oldfmt = 0;		/* Use old libc5 format? */
char **show = NULL;	/* What do they want us to show */
const char *ufile;	/* Filename of this file */
time_t lastdate;	/* Last date we've seen */
const char *progname;	/* Name of this program */
#if CHOP_DOMAIN
char hostname[256];	/* For gethostbyname() */
char *domainname;	/* Our domainname. */
#endif

/*
 *	Convert old utmp format to new.
 */
void uconv(const struct oldutmp *oldut, struct utmpx *utn)
{
	memset(utn, 0, sizeof(struct utmpx));
	utn->ut_type = oldut->ut_type;
	utn->ut_pid  = oldut->ut_pid;
	utn->ut_time = oldut->ut_oldtime;
#if defined __GLIBC__ || defined __CYGWIN__
#ifdef __GLIBC__
	utn->ut_addr_v6[0]
#else
	utn->ut_addr
#endif
		= oldut->ut_oldaddr;
#endif
	strncpy(utn->ut_line, oldut->ut_line, OLD_LINESIZE);
	strncpy(utn->ut_user, oldut->ut_user, OLD_NAMESIZE);
	strncpy(utn->ut_host, oldut->ut_host, OLD_HOSTSIZE);
}

#if NEW_UTMP
/*
 *	Read one utmp entry, return in new format.
 *	Automatically reposition file pointer.
 */
int uread(FILE *fp, struct utmpx *u, int *quit)
{
	static int utsize;
	static char buf[UCHUNKSIZE];
	char tmp[1024];
	static off_t fpos;
	static int bpos;
	struct oldutmp uto;
	int r;
	off_t o;

	if (quit == NULL && u != NULL) {
		/*
		 *	Normal read.
		 */
		if (oldfmt) {
			r = fread(&uto, sizeof(uto), 1, fp);
			uconv(&uto, u);
		} else
			r = fread(u, sizeof(struct utmpx), 1, fp);
		return r;
	}

	if (u == NULL) {
		/*
		 *	Initialize and position.
		 */
		utsize = oldfmt ? sizeof(uto) : sizeof(struct utmpx);
		fseeko(fp, 0, SEEK_END);
		fpos = ftello(fp);
		if (fpos == 0)
			return 0;
		o = ((fpos - 1) / UCHUNKSIZE) * UCHUNKSIZE;
		if (fseeko(fp, o, SEEK_SET) < 0) {
			fprintf(stderr, "%s: seek failed!\n", progname);
			return 0;
		}
		bpos = (int)(fpos - o);
		if (fread(buf, bpos, 1, fp) != 1) {
			fprintf(stderr, "%s: read failed!\n", progname);
			return 0;
		}
		fpos = o;
		return 1;
	}

	/*
	 *	Read one struct. From the buffer if possible.
	 */
	bpos -= utsize;
	if (bpos >= 0) {
		if (oldfmt)
			uconv((struct oldutmp *)(buf + bpos), u);
		else
			memcpy(u, buf + bpos, sizeof(struct utmpx));
		return 1;
	}

	/*
	 *	Oops we went "below" the buffer. We should be able to
	 *	seek back UCHUNKSIZE bytes.
	 */
	fpos -= UCHUNKSIZE;
	if (fpos < 0)
		return 0;

	/*
	 *	Copy whatever is left in the buffer.
	 */
	memcpy(tmp + (-bpos), buf, utsize + bpos);
	if (fseeko(fp, fpos, SEEK_SET) < 0) {
		perror("fseek");
		return 0;
	}

	/*
	 *	Read another UCHUNKSIZE bytes.
	 */
	if (fread(buf, UCHUNKSIZE, 1, fp) != 1) {
		perror("fread");
		return 0;
	}

	/*
	 *	The end of the UCHUNKSIZE byte buffer should be the first
	 *	few bytes of the current struct utmp.
	 */
	memcpy(tmp, buf + UCHUNKSIZE + bpos, -bpos);
	bpos += UCHUNKSIZE;

	if (oldfmt)
		uconv((struct oldutmp *)tmp, u);
	else
		memcpy(u, tmp, sizeof(struct utmpx));

	return 1;
}

#else /* NEW_UTMP */

/*
 *	Read one utmp entry, return in new format.
 *	Automatically reposition file pointer.
 */
int uread(FILE *fp, struct utmpx *u, int *quit)
{
	struct oldutmp uto;
	off_t r;

	if (u == NULL) {
		r = oldfmt ? sizeof(struct oldutmp) : sizeof(struct utmpx);
		fseek(fp, -1 * r, SEEK_END);
		return 1;
	}

	if (!oldfmt) {
		r = fread(u, sizeof(struct utmpx), 1, fp);
		if (r == 1) {
			if (fseeko(fp, -2 * sizeof(struct utmpx), SEEK_CUR) < 0)
				if (quit) *quit = 1;
		}
		return r;
	}
	r = fread(&uto, sizeof(struct oldutmp), 1, fp);
	if (r == 1) {
		if (fseeko(fp, -2 * sizeof(struct oldutmp), SEEK_CUR) < 0)
			if (quit) *quit = 1;
		uconv(&uto, u);
	}

	return r;
}
#endif

/*
 *	Try to be smart about the location of the BTMP file
 */
#ifndef BTMPX_FILE
#define BTMPX_FILE getbtmpx()
static char *getbtmpx()
{
	static char btmpx[128];
	char *p;

	strcpy(btmpx, WTMPX_FILE);
	p = strrchr(btmpx, '/');
	if(p) p++;
	else p = btmpx;
	*p = 'b';
	return btmpx;
}
#endif

/*
 *	Print a short date.
 */
const char *datestr()
{
	char *s = ctime(&lastdate);
	s[16] = 0;
	return s;
}

/*
 *	SIGINT handler
 */
void int_handler()
{
	printf("Interrupted %s\n", datestr());
	exit(1);
}

/*
 *	SIGQUIT handler
 */
void quit_handler()
{
	printf("Interrupted %s\n", datestr());
	signal(SIGQUIT, quit_handler);
}

/*
 *	Get the basename of a filename
 */
const char *mybasename(const char *s)
{
	const char *p;

	if ((p = strrchr(s, '/')) != NULL)
		p++;
	else
		p = s;
	return p;
}

#if defined __GLIBC__ || defined __CYGWIN__
/*
 *	Lookup a host with DNS.
 */
#ifdef __GLIBC__
int dns_lookup(char *result, int size, int useip, const int32_t *a)
#else
int dns_lookup(char *result, int size, int useip, int32_t a)
#endif
{
	struct sockaddr_in	sin;
	struct sockaddr		*sa;
	int			salen, flags;
#ifdef __GLIBC__
#ifndef _NO_IPV6
	struct sockaddr_in6	sin6;
#endif
	unsigned int		topnibble;
	unsigned int		azero = 0, sitelocal = 0;
	int			mapped = 0;
#endif

	flags = useip ? NI_NUMERICHOST : 0;

	/*
	 *	IPv4 or IPv6 ? We use 2 heuristics:
	 *	1. Current IPv6 range uses 2000-3fff or fec0-feff.
	 *	   Outside of that is illegal and must be IPv4.
	 *	2. If last 3 bytes are 0, must be IPv4
	 *	3. If IPv6 in IPv4, handle as IPv4
	 *
	 *	Ugly.
	 */
#ifdef __GLIBC__
	if (a[0] == 0 && a[1] == 0 && a[2] == htonl (0xffff))
		mapped = 1;
	topnibble = ntohl((unsigned int)a[0]) >> 28;

	azero = ntohl((unsigned int)a[0]) >> 16;
	sitelocal = (azero >= 0xfec0 && azero <= 0xfeff) ? 1 : 0;
	if (((topnibble < 2 || topnibble > 3) && (!sitelocal)) || mapped ||
	    (a[1] == 0 && a[2] == 0 && a[3] == 0)) {
#endif
		/* IPv4 */
		sin.sin_family = AF_INET;
		sin.sin_port = 0;
#ifdef __GLIBC__
		sin.sin_addr.s_addr = mapped ? a[3] : a[0];
#else
		sin.sin_addr.s_addr = a;
#endif
		sa = (struct sockaddr *)&sin;
		salen = sizeof(sin);
#ifdef __GLIBC__
	} else {
#ifdef _NO_IPV6
		return EAI_NONAME;
#else
		/* IPv6 */
		memset(&sin6, 0, sizeof(sin6));
		sin6.sin6_family = AF_INET6;
		sin6.sin6_port = 0;
		memcpy(sin6.sin6_addr.s6_addr, a, 16);
		sa = (struct sockaddr *)&sin6;
		salen = sizeof(sin6);
#endif
	}
#endif
	return getnameinfo(sa, salen, result, size, NULL, 0, flags);
}
#endif

/*
 *	Show one line of information on screen
 */
int list(const struct utmpx *p, time_t t, int what)
{
	time_t		secs, tmp;
	char		logintime[32];
	char		logouttime[32];
	char		length[32];
	char		final[128];
	char		utline[sizeof p->ut_line + 1];
	char		domain[256];
	char		*s, **walk;
	int		mins, hours, days;
#if defined __GLIBC__ || defined __CYGWIN__
	int		r;
#endif

	/*
	 *	uucp and ftp have special-type entries
	 */
	utline[0] = 0;
	strncat(utline, p->ut_line, sizeof p->ut_line);
	if (strncmp(utline, "ftp", 3) == 0 && isdigit(utline[3]))
		utline[3] = 0;
	if (strncmp(utline, "uucp", 4) == 0 && isdigit(utline[4]))
		utline[4] = 0;

	/*
	 *	Is this something we wanna show?
	 */
	if (show) {
		for (walk = show; *walk; walk++) {
			if (strncmp(p->ut_user, *walk, sizeof p->ut_user) == 0 ||
			    strcmp(utline, *walk) == 0 ||
			    (strncmp(utline, "tty", 3) == 0 &&
			     strcmp(utline + 3, *walk) == 0)) break;
		}
		if (*walk == NULL) return 0;
	}

	/*
	 *	Calculate times
	 */
	tmp = (time_t)p->ut_time;
	strcpy(logintime, ctime(&tmp));
	if (fulltime)
		sprintf(logouttime, "- %s", ctime(&t));
	else {
		logintime[16] = 0;
		sprintf(logouttime, "- %s", ctime(&t) + 11);
		logouttime[7] = 0;
	}
	secs = t - p->ut_time;
	mins  = (secs / 60) % 60;
	hours = (secs / 3600) % 24;
	days  = secs / 86400;
	if (days)
		sprintf(length, "(%d+%02d:%02d)", days, hours, mins);
	else
		sprintf(length, " (%02d:%02d)", hours, mins);

	switch(what) {
		case R_CRASH:
			sprintf(logouttime, "- crash");
			break;
		case R_DOWN:
			sprintf(logouttime, "- down ");
			break;
		case R_NOW:
			length[0] = 0;
			if (fulltime)
				sprintf(logouttime, "  still logged in");
			else {
				sprintf(logouttime, "  still");
				sprintf(length, "logged in");
			}
			break;
		case R_PHANTOM:
			length[0] = 0;
			if (fulltime)
				sprintf(logouttime, "  gone - no logout");
			else {
				sprintf(logouttime, "   gone");
				sprintf(length, "- no logout");
			}
			break;
		case R_REBOOT:
			break;
		case R_TIMECHANGE:
			logouttime[0] = 0;
			length[0] = 0;
			break;
		case R_NORMAL:
			break;
 	}

	/*
	 *	Look up host with DNS if needed.
	 */
#if defined __GLIBC__ || defined __CYGWIN__
	r = -1;
	if (usedns || useip) {
		r = dns_lookup(domain, sizeof(domain), useip,
#ifdef __GLIBC__
			p->ut_addr_v6
#else
			(int32_t)p->ut_addr
#endif
			);
	}
	if (r < 0) {
#else
	{
#endif
		size_t len = sizeof p->ut_host;
		if (len >= sizeof(domain)) len = sizeof(domain) - 1;
		domain[0] = 0;
		strncat(domain, p->ut_host, len);
	}

	if (showhost) {
#if CHOP_DOMAIN
		/*
		 *	See if this is in our domain.
		 */
		if (!usedns && (s = strchr(p->ut_host, '.')) != NULL &&
		     strcmp(s + 1, domainname) == 0) *s = 0;
#endif
		if (!altlist) {
			snprintf(final, sizeof(final),
				fulltime ?
				"%-8.8s %-12.12s %-16.16s %-24.24s %-26.26s %-12.12s\n" :
				"%-8.8s %-12.12s %-16.16s %-16.16s %-7.7s %-12.12s\n",
				p->ut_user, utline,
				domain, logintime, logouttime, length);
		} else {
			snprintf(final, sizeof(final), 
				fulltime ?
				"%-8.8s %-12.12s %-24.24s %-26.26s %-12.12s %s\n" :
				"%-8.8s %-12.12s %-16.16s %-7.7s %-12.12s %s\n",
				p->ut_user, utline,
				logintime, logouttime, length, domain);
		}
	} else {
		snprintf(final, sizeof(final),
			fulltime ?
			"%-8.8s %-12.12s %-24.24s %-26.26s %-12.12s\n" :
			"%-8.8s %-12.12s %-16.16s %-7.7s %-12.12s\n",
			p->ut_user, utline,
			logintime, logouttime, length);
	}

	/*
	 *	Print out "final" string safely.
	 */
	for (s = final; *s; s++) {
		if (*s == '\n' || (*s >= 32 && (unsigned char)*s <= 126))
			putchar(*s);
		else
			putchar('*');
	}

	recsdone++;
	if (maxrecs && recsdone >= maxrecs)
		return 1;

	return 0;
}


/*
 *	show usage
 */
void usage(const char *s)
{
	fprintf(stderr, "Usage: %s [-<num> | -n <num>] [-f <file>] "
			"[-t <YYYYMMDDHHMMSS>] "
			"[-R] [-adioxF] [<username> ...] [<tty> ...]\n", s);
	exit(1);
}

time_t parsetm(const char *ts)
{
	struct tm	u, origu;
	time_t		tm;

	memset(&tm, 0, sizeof(tm));

	if (sscanf(ts, "%4d%2d%2d%2d%2d%2d", &u.tm_year,
	    &u.tm_mon, &u.tm_mday, &u.tm_hour, &u.tm_min,
	    &u.tm_sec) != 6)
		return (time_t)-1;

	u.tm_year -= 1900;
	u.tm_mon -= 1;
	u.tm_isdst = -1;

	origu = u;

	if ((tm = mktime(&u)) == (time_t)-1)
		return tm;

	/*
	 *	Unfortunately mktime() is much more forgiving than
	 *	it should be.  For example, it'll gladly accept
	 *	"30" as a valid month number.  This behavior is by
	 *	design, but we don't like it, so we want to detect
	 *	it and complain.
	 */
	if (u.tm_year != origu.tm_year ||
	    u.tm_mon != origu.tm_mon ||
	    u.tm_mday != origu.tm_mday ||
	    u.tm_hour != origu.tm_hour ||
	    u.tm_min != origu.tm_min ||
	    u.tm_sec != origu.tm_sec)
		return (time_t)-1;

	return tm;
}

int main(int argc, char **argv)
{
	FILE *fp;		/* Filepointer of wtmpx file */

	struct utmpx ut;	/* Current utmp entry */
	struct utmpx oldut;	/* Old utmp entry to check for duplicates */
	struct utmplist *p;	/* Pointer into utmplist */
	struct utmplist *next;	/* Pointer into utmplist */

	time_t lastboot = 0;	/* Last boottime */
	time_t lastrch = 0;	/* Last run level change */
	time_t lastdown;	/* Last downtime */
	time_t begintime;	/* When wtmpx begins */
	int whydown = 0;	/* Why we went down: crash or shutdown */

	int c, x;		/* Scratch */
	struct stat st;		/* To stat the [uw]tmp file */
	int quit = 0;		/* Flag */
	int down = 0;		/* Down flag */
	int lastb = 0;		/* Is this 'lastb' ? */
	int extended = 0;	/* Lots of info. */
	char *altufile = NULL;	/* Alternate wtmpx */

	time_t until = 0;	/* at what time to stop parsing the file */

	progname = mybasename(argv[0]);

	/* Process the arguments. */
	while((c = getopt(argc, argv, "f:n:RxadFiot:0123456789")) != EOF) {
		switch(c) {
			case 'R':
				showhost = 0;
				break;
			case 'x':
				extended = 1;
				break;
			case 'n':
				maxrecs = atoi(optarg);
				break;
			case 'o':
				oldfmt = 1;
				break;
			case 'f':
				if((altufile = malloc(strlen(optarg)+1)) == NULL) {
					fprintf(stderr, "%s: out of memory\n",
							progname);
					exit(1);
				}
				strcpy(altufile, optarg);
				break;
			case 'd':
				usedns++;
				break;
			case 'i':
				useip++;
				break;
			case 'a':
				altlist++;
				break;
			case 'F':
				fulltime++;
				break;
			case 't':
				if ((until = parsetm(optarg)) == (time_t)-1) {
					fprintf(stderr, "%s: Invalid time value \"%s\"\n",
							progname, optarg);
					usage(progname);
				}
				break;
			case '0': case '1': case '2': case '3': case '4':
			case '5': case '6': case '7': case '8': case '9':
				maxrecs = 10*maxrecs + c - '0';
				break;
			default:
				usage(progname);
				break;
		}
	}
	if (optind < argc) show = argv + optind;

	/*
	 *	Which file do we want to read?
	 */
	if (strcmp(progname, "lastb") == 0) {
		ufile = BTMPX_FILE;
		lastb = 1;
	} else {
		ufile = WTMPX_FILE;
	}
	if (altufile)
		ufile = altufile;
	time(&lastdown);
	lastrch = lastdown;

	/*
	 *	Fill in 'lastdate'
	 */
	lastdate = lastdown;

#if CHOP_DOMAIN
	/*
	 *	Find out domainname.
	 *
	 *	This doesn't work on modern systems, where only a DNS
	 *	lookup of the result from hostname() will get you the domainname.
	 *	Remember that domainname() is the NIS domainname, not DNS.
	 *	So basically this whole piece of code is bullshit.
	 */
	hostname[0] = 0;
	(void) gethostname(hostname, sizeof(hostname));
	if ((domainname = strchr(hostname, '.')) != NULL) domainname++;
	if (domainname == NULL || domainname[0] == 0) {
		hostname[0] = 0;
		(void) getdomainname(hostname, sizeof(hostname));
		hostname[sizeof(hostname) - 1] = 0;
		domainname = hostname;
		if (strcmp(domainname, "(none)") == 0 || domainname[0] == 0)
			domainname = NULL;
	}
#endif

	/*
	 *	Install signal handlers
	 */
	signal(SIGINT, int_handler);
	signal(SIGQUIT, quit_handler);

	/*
	 *	Open the utmp file
	 */
	if ((fp = fopen(ufile, "r")) == NULL) {
		x = errno;
		fprintf(stderr, "%s: %s: %s\n", progname, ufile, strerror(errno));
		if (altufile == NULL && x == ENOENT)
			fprintf(stderr, "Perhaps this file was removed by the "
					"operator to prevent logging %s info.\n", progname);
		exit(1);
	}

	/*
	 *	Optimize the buffer size.
	 */
	setvbuf(fp, NULL, _IOFBF, UCHUNKSIZE);

	/*
	 *	Read first structure to capture the time field
	 */
	if (uread(fp, &ut, NULL) == 1) {
		begintime = ut.ut_time;
	} else {
		fstat(fileno(fp), &st);
		begintime = st.st_ctime;
		quit = 1;
	}

	/*
	 *	Go to end of file minus one structure
	 *	and/or initialize utmp reading code.
	 */
	uread(fp, NULL, NULL);

	/*
	 *	Read struct after struct backwards from the file.
	 */
	while(!quit) {

		if (uread(fp, &ut, &quit) != 1)
			break;

		if (until && until < ut.ut_time)
			continue;

		if (memcmp(&ut, &oldut, sizeof(struct utmpx)) == 0) continue;
		memcpy(&oldut, &ut, sizeof(struct utmpx));
		lastdate = ut.ut_time;

		if (lastb) {
			quit = list(&ut, ut.ut_time, R_NORMAL);
			continue;
		}

		/*
		 *	Set ut_type to the correct type.
		 */
		if (strncmp(ut.ut_line, "~", 1) == 0) {
			if (strncmp(ut.ut_user, "shutdown", 8) == 0)
				ut.ut_type = SHUTDOWN_TIME;
			else if (strncmp(ut.ut_user, "reboot", 6) == 0)
				ut.ut_type = BOOT_TIME;
			else if (strncmp(ut.ut_user, "runlevel", 8) == 0)
				ut.ut_type = RUN_LVL;
		}
#if 1 /*def COMPAT*/
		/*
		 *	For stupid old applications that don't fill in
		 *	ut_type correctly.
		 */
		else {
			if (ut.ut_type != DEAD_PROCESS &&
					ut.ut_user[0] && ut.ut_line[0] &&
					strcmp(ut.ut_user, "LOGIN") != 0)
				ut.ut_type = USER_PROCESS;
			/*
			 *	Even worse, applications that write ghost
			 *	entries: ut_type set to USER_PROCESS but
			 *	empty ut_user...
			 */
			//if (ut.ut_user[0] == 0)
			//	ut.ut_type = DEAD_PROCESS;
			// Stop support this

			/*
			 *	Clock changes.
			 */
			if (strcmp(ut.ut_user, "date") == 0) {
				if (ut.ut_line[0] == '|') ut.ut_type = OLD_TIME;
				if (ut.ut_line[0] == '{') ut.ut_type = NEW_TIME;
			}
		}
#endif

		switch (ut.ut_type) {
			case SHUTDOWN_TIME:
				if (extended) {
					strcpy(ut.ut_line, "system down");
					quit = list(&ut, lastboot, R_NORMAL);
				}
				lastdown = lastrch = ut.ut_time;
				down = 1;
				break;
			case OLD_TIME:
			case NEW_TIME:
				if (extended) {
					strcpy(ut.ut_line,
							ut.ut_type == NEW_TIME ? "new time" :
							"old time");
					quit = list(&ut, lastdown, R_TIMECHANGE);
				}
				break;
			case BOOT_TIME:
				strcpy(ut.ut_line, "system boot");
				quit = list(&ut, lastdown, R_REBOOT);
				lastboot = ut.ut_time;
				down = 1;
				break;
			case RUN_LVL:
				x = ut.ut_pid & 255;
				if(x) {
					if (extended) {
						sprintf(ut.ut_line, "(to lvl %c)", x);
						quit = list(&ut, lastrch, R_NORMAL);
					}
					if (x == '0' || x == '6') {
						lastdown = ut.ut_time;
						down = 1;
						ut.ut_type = SHUTDOWN_TIME;
					}
				} else if(*ut.ut_line && extended) {
					if(!*ut.ut_user) strcpy(ut.ut_user, "runlevel");
					quit = list(&ut, lastrch, R_NORMAL);
				}
				lastrch = ut.ut_time;
				break;

			case USER_PROCESS:
				/*
				 *	This was a login - show the first matching
				 *	logout record and delete all records with
				 *	the same ut_line.
				 */
				c = 0;
				for (p = utmplist; p; p = next) {
					next = p->next;
					if(strncmp(p->ut.ut_line, ut.ut_line, sizeof p->ut.ut_line) == 0) {
						/* Show it */
						if (c == 0) {
							quit = list(&ut, p->ut.ut_time,
									R_NORMAL);
							c = 1;
						}
						if (p->next) p->next->prev = p->prev;
						if (p->prev) p->prev->next = p->next;
						else utmplist = p->next;
						free(p);
					}
				}
				/*
				 *	Not found? Then crashed, down, still
				 *	logged in, or missing logout record.
				 */
				if (c == 0) {
					if (lastboot == 0) {
						c = R_NOW;
						/* Is process still alive? */
						if (ut.ut_pid > 0 &&
						kill(ut.ut_pid, 0) != 0 &&
						errno == ESRCH) {
							c = R_PHANTOM;
						}
					} else c = whydown;
					quit = list(&ut, lastboot, c);
				}
				/* FALLTHRU */

			case DEAD_PROCESS:
				/*
				 *	Just store the data if it is
				 *	interesting enough.
				 */
				if (ut.ut_line[0] == 0)
					break;
				if ((p = malloc(sizeof(struct utmplist))) == NULL) {
					fprintf(stderr, "%s: out of memory\n",
						progname);
					exit(1);
				}
				memcpy(&p->ut, &ut, sizeof(struct utmpx));
				p->next  = utmplist;
				p->prev  = NULL;
				if (utmplist) utmplist->prev = p;
				utmplist = p;
				break;

		}
		/*
		 *	If we saw a shutdown/reboot record we can remove
		 *	the entire current utmplist.
		 */
		if (down) {
			lastboot = ut.ut_time;
			whydown = (ut.ut_type == SHUTDOWN_TIME) ? R_DOWN : R_CRASH;
			for (p = utmplist; p; p = next) {
				next = p->next;
				free(p);
			}
			utmplist = NULL;
			down = 0;
		}
	}
	printf("\n%s begins %s", mybasename(ufile), ctime(&begintime));

	fclose(fp);

	/*
	 *	Should we free memory here? Nah. This is not NT :)
	 */
	return 0;
}