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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/last/last.c	Lines:	0	249	0.0 %
Date:	2017-11-13	Branches:	0	196	0.0 %


/*	$OpenBSD: last.c,v 1.50 2015/10/29 03:00:31 deraadt Exp $	*/
/*	$NetBSD: last.c,v 1.6 1994/12/24 16:49:02 cgd Exp $	*/

/*
 * Copyright (c) 1987, 1993, 1994
 *	The Regents of the University of California.  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.
 * 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.
 */

#include <sys/stat.h>

#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <libgen.h>
#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <limits.h>
#include <utmp.h>

#define	NO	0				/* false/no */
#define	YES	1				/* true/yes */
#define ATOI2(ar)	((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;

static struct utmp	buf[1024];		/* utmp read buffer */

struct arg {
	char	*name;				/* argument */
#define	HOST_TYPE	-2
#define	TTY_TYPE	-3
#define	USER_TYPE	-4
	int	type;				/* type of arg */
	struct	arg *next;			/* linked list pointer */
} *arglist;

struct ttytab {
	time_t	logout;				/* log out time */
	char	tty[UT_LINESIZE + 1];		/* terminal name */
	struct	ttytab*next;			/* linked list pointer */
} *ttylist;

static time_t	currentout;			/* current logout value */
static long	maxrec = -1;			/* records to display */
static char	*file = _PATH_WTMP;		/* wtmp file */
static int	fulltime = 0;			/* Display seconds? */
static time_t	snaptime = 0;			/* report only at this time */
static int	calculate = 0;
static int	seconds = 0;

void	 addarg(int, char *);
struct ttytab	*addtty(char *);
void	 hostconv(char *);
void	 onintr(int);
char	*ttyconv(char *);
time_t	 dateconv(char *);
int	 want(struct utmp *, int);
void	 wtmp(void);
void	 checkargs(void);
void	 print_entry(const struct utmp *);
void	 usage(void);

#define NAME_WIDTH	9
#define HOST_WIDTH	24

#define SECSPERDAY	(24 * 60 * 60)

int
main(int argc, char *argv[])
{
	const char *errstr;
	int ch, lastch = '\0', newarg = 1, prevoptind = 1;

	if (pledge("stdio rpath flock cpath wpath", NULL) == -1)
		err(1, "pledge");

	while ((ch = getopt(argc, argv, "0123456789cf:h:n:st:d:T")) != -1) {
		switch (ch) {
		case '0': case '1': case '2': case '3': case '4':
		case '5': case '6': case '7': case '8': case '9':
			/*
			 * kludge: last was originally designed to take
			 * a number after a dash.
			 */
			if (newarg || !isdigit(lastch))
				maxrec = 0;
			else if (maxrec > INT_MAX / 10)
				usage();
			maxrec = (maxrec * 10) + (ch - '0');
			break;
		case 'c':
			calculate = 1;
			break;
		case 'f':
			file = optarg;
			break;
		case 'h':
			hostconv(optarg);
			addarg(HOST_TYPE, optarg);
			break;
		case 'n':
			maxrec = strtonum(optarg, 0, LONG_MAX, &errstr);
			if (errstr != NULL)
				errx(1, "number of lines is %s: %s", errstr,
				    optarg);
			if (maxrec == 0)
				exit(0);
			break;
		case 's':
			seconds = 1;
			break;
		case 't':
			addarg(TTY_TYPE, ttyconv(optarg));
			break;
		case 'd':
			snaptime = dateconv(optarg);
			break;
		case 'T':
			fulltime = 1;
			break;
		default:
			usage();
		}
		lastch = ch;
		newarg = optind != prevoptind;
		prevoptind = optind;
	}
	if (maxrec == 0)
		exit(0);

	if (argc) {
		setvbuf(stdout, NULL, _IOLBF, 0);
		for (argv += optind; *argv; ++argv) {
#define	COMPATIBILITY
#ifdef	COMPATIBILITY
			/* code to allow "last p5" to work */
			addarg(TTY_TYPE, ttyconv(*argv));
#endif
			addarg(USER_TYPE, *argv);
		}
	}

	checkargs();
	wtmp();
	exit(0);
}

/*
 * if snaptime is set, print warning if usernames, or -t or -h
 * flags are also provided
 */
void
checkargs(void)
{
	int	ttyflag = 0;
	struct arg *step;

	if (!snaptime || !arglist)
		return;

	for (step = arglist; step; step = step->next)
		switch (step->type) {
		case HOST_TYPE:
			(void)fprintf(stderr,
			    "Warning: Ignoring hostname flag\n");
			break;
		case TTY_TYPE:
			if (!ttyflag) { /* don't print this twice */
				(void)fprintf(stderr,
				    "Warning: Ignoring tty flag\n");
				ttyflag = 1;
			}
			break;
		case USER_TYPE:
			(void)fprintf(stderr,
			    "Warning: Ignoring username[s]\n");
			break;
		default:
			break;
			/* PRINT NOTHING */
		}
}

void
print_entry(const struct utmp *bp)
{
	printf("%-*.*s %-*.*s %-*.*s ",
	    NAME_WIDTH, UT_NAMESIZE, bp->ut_name,
	    UT_LINESIZE, UT_LINESIZE, bp->ut_line,
	    HOST_WIDTH, UT_HOSTSIZE, bp->ut_host);

	if (seconds)
		printf("%lld", (long long)bp->ut_time);
	else {
		struct tm *tm;

		tm = localtime(&bp->ut_time);
		if (tm == NULL) {
			/* bogus entry?  format as epoch time... */
			printf("%lld", (long long)bp->ut_time);
		} else {
			char	tim[40];

			strftime(tim, sizeof tim,
			    fulltime ? "%a %b %d %H:%M:%S" : "%a %b %d %H:%M",
			    tm);
			printf("%s", tim);
		}
	}
}


/*
 * read through the wtmp file
 */
void
wtmp(void)
{
	time_t	delta, total = 0;
	int	timesize, wfd, snapfound = 0;
	char	*ct, *crmsg = "invalid";
	struct utmp	*bp;
	struct stat	stb;
	ssize_t	bytes;
	off_t	bl;
	struct ttytab	*T;

	if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1)
		err(1, "%s", file);
	bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf);

	if (fulltime)
		timesize = 8;	/* HH:MM:SS */
	else
		timesize = 5;	/* HH:MM */

	(void)time(&buf[0].ut_time);
	(void)signal(SIGINT, onintr);
	(void)signal(SIGQUIT, onintr);

	while (--bl >= 0) {
		if (lseek(wfd, bl * sizeof(buf), SEEK_SET) == -1 ||
		    (bytes = read(wfd, buf, sizeof(buf))) == -1)
			err(1, "%s", file);
		for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) {
			/*
			 * if the terminal line is '~', the machine stopped.
			 * see utmp(5) for more info.
			 */
			if (bp->ut_line[0] == '~' && !bp->ut_line[1]) {
				/* everybody just logged out */
				for (T = ttylist; T; T = T->next)
					T->logout = -bp->ut_time;
				currentout = -bp->ut_time;
				crmsg = strncmp(bp->ut_name, "shutdown",
				    UT_NAMESIZE) ? "crash" : "shutdown";

				/*
				 * if we're in snapshot mode, we want to
				 * exit if this shutdown/reboot appears
				 * while we we are tracking the active
				 * range
				 */
				if (snaptime && snapfound) {
					close(wfd);
					return;
				}

				/*
				 * don't print shutdown/reboot entries
				 * unless flagged for
				 */
				if (want(bp, NO)) {
					print_entry(bp);
					printf("\n");
					if (maxrec != -1 && !--maxrec) {
						close(wfd);
						return;
					}
				}
				continue;
			}

			/*
			 * if the line is '{' or '|', date got set; see
			 * utmp(5) for more info.
			 */
			if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|') &&
			    !bp->ut_line[1]) {
				if (want(bp, NO)) {
					print_entry(bp);
					printf("\n");
					if (maxrec && !--maxrec) {
						close(wfd);
						return;
					}
				}
				continue;
			}

			/* find associated tty */
			for (T = ttylist;; T = T->next) {
				if (!T) {
					/* add new one */
					T = addtty(bp->ut_line);
					break;
				}
				if (!strncmp(T->tty, bp->ut_line, UT_LINESIZE))
					break;
			}

			/*
			 * print record if not in snapshot mode and wanted
			 * or in snapshot mode and in snapshot range
			 */
			if (bp->ut_name[0] &&
			    ((want(bp, YES)) || (bp->ut_time < snaptime &&
			    (T->logout > snaptime || !T->logout ||
			    T->logout < 0)))) {
				snapfound = 1;
				print_entry(bp);
				printf(" ");

				if (!T->logout)
					puts("  still logged in");
				else {
					if (T->logout < 0) {
						T->logout = -T->logout;
						printf("- %s", crmsg);
					} else {
						if (seconds)
							printf("- %lld",
							    (long long)T->logout);
						else
							printf("- %*.*s",
							    timesize, timesize,
							    ctime(&T->logout)+11);
					}
					delta = T->logout - bp->ut_time;
					if (seconds)
						printf("  (%lld)\n",
						    (long long)delta);
					else {
						if (delta < SECSPERDAY)
							printf("  (%*.*s)\n",
							    timesize, timesize,
							    asctime(gmtime(&delta))+11);
						else
							printf(" (%lld+%*.*s)\n",
							    (long long)delta / SECSPERDAY,
							    timesize, timesize,
							    asctime(gmtime(&delta))+11);
					}
					if (calculate)
						total += delta;
				}
				if (maxrec != -1 && !--maxrec) {
					close(wfd);
					return;
				}
			}
			T->logout = bp->ut_time;
		}
	}
	close(wfd);
	if (calculate) {
		if ((total / SECSPERDAY) > 0) {
			int days = (total / SECSPERDAY);
			total -= (days * SECSPERDAY);

			printf("\nTotal time: %d days, %*.*s\n",
			    days, timesize, timesize,
			    asctime(gmtime(&total))+11);
		} else
			printf("\nTotal time: %*.*s\n",
			    timesize, timesize,
			    asctime(gmtime(&total))+11);
	}
	ct = ctime(&buf[0].ut_time);
	printf("\n%s begins %10.10s %*.*s %4.4s\n", basename(file), ct,
	    timesize, timesize, ct + 11, ct + 20);
}

/*
 * see if want this entry
 */
int
want(struct utmp *bp, int check)
{
	struct arg *step;

	if (check) {
		/*
		 * some entries, such as ftp and uucp, will
		 * include process name plus id; exclude entries
		 * that start with 'console' and 'tty' from
		 * having the process id stripped.
		 */
		if ((strncmp(bp->ut_line, "console", strlen("console")) != 0) &&
		    (strncmp(bp->ut_line, "tty", strlen("tty")) != 0)) {
			char *s;
			for (s = bp->ut_line;
			     *s != '\0' && !isdigit((unsigned char)*s); s++)
				;
			*s = '\0';
		}
	}

	if (snaptime)		/* if snaptime is set, return NO */
		return (NO);

	if (!arglist)
		return (YES);

	for (step = arglist; step; step = step->next)
		switch (step->type) {
		case HOST_TYPE:
			if (!strncasecmp(step->name, bp->ut_host, UT_HOSTSIZE))
				return (YES);
			break;
		case TTY_TYPE:
			if (!strncmp(step->name, bp->ut_line, UT_LINESIZE))
				return (YES);
			break;
		case USER_TYPE:
			if (!strncmp(step->name, bp->ut_name, UT_NAMESIZE))
				return (YES);
			break;
		}

	return (NO);
}

/*
 * add an entry to a linked list of arguments
 */
void
addarg(int type, char *arg)
{
	struct arg *cur;

	if (!(cur = malloc((u_int)sizeof(struct arg))))
		err(1, "malloc failure");
	cur->next = arglist;
	cur->type = type;
	cur->name = arg;
	arglist = cur;
}

/*
 * add an entry to a linked list of ttys
 */
struct ttytab *
addtty(char *ttyname)
{
	struct ttytab *cur;

	if (!(cur = malloc((u_int)sizeof(struct ttytab))))
		err(1, "malloc failure");
	cur->next = ttylist;
	cur->logout = currentout;
	memmove(cur->tty, ttyname, UT_LINESIZE);
	return (ttylist = cur);
}

/*
 * convert the hostname to search pattern; if the supplied host name
 * has a domain attached that is the same as the current domain, rip
 * off the domain suffix since that's what login(1) does.
 */
void
hostconv(char *arg)
{
	static char *hostdot, name[HOST_NAME_MAX+1];
	static int first = 1;
	char *argdot;

	if (!(argdot = strchr(arg, '.')))
		return;
	if (first) {
		first = 0;
		if (gethostname(name, sizeof(name)))
			err(1, "gethostname");
		hostdot = strchr(name, '.');
	}
	if (hostdot && !strcasecmp(hostdot, argdot))
		*argdot = '\0';
}

/*
 * convert tty to correct name.
 */
char *
ttyconv(char *arg)
{
	size_t len = 8;
	char *mval;

	/*
	 * kludge -- we assume that all tty's end with
	 * a two character suffix.
	 */
	if (strlen(arg) == 2) {
		/* either 6 for "ttyxx" or 8 for "console" */
		if (!(mval = malloc(len)))
			err(1, "malloc failure");
		if (!strcmp(arg, "co"))
			(void)strlcpy(mval, "console", len);
		else
			snprintf(mval, len, "tty%s", arg);
		return (mval);
	}
	if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1))
		return (arg + 5);
	return (arg);
}

/*
 * Convert the snapshot time in command line given in the format
 *	[[[CC]YY]MMDD]hhmm[.SS]] to a time_t.
 *	Derived from atime_arg1() in usr.bin/touch/touch.c
 */
time_t
dateconv(char *arg)
{
	time_t timet;
	struct tm *t;
	int yearset;
	char *p;

	/* Start with the current time. */
	if (time(&timet) < 0)
		err(1, "time");
	if ((t = localtime(&timet)) == NULL)
		err(1, "localtime");

	/* [[[CC]YY]MMDD]hhmm[.SS] */
	if ((p = strchr(arg, '.')) == NULL)
		t->tm_sec = 0;		/* Seconds defaults to 0. */
	else {
		if (strlen(p + 1) != 2)
			goto terr;
		*p++ = '\0';
		t->tm_sec = ATOI2(p);
	}

	yearset = 0;
	switch (strlen(arg)) {
	case 12:			/* CCYYMMDDhhmm */
		t->tm_year = ATOI2(arg);
		t->tm_year *= 100;
		yearset = 1;
		/* FALLTHROUGH */
	case 10:			/* YYMMDDhhmm */
		if (yearset) {
			yearset = ATOI2(arg);
			t->tm_year += yearset;
		} else {
			yearset = ATOI2(arg);
			if (yearset < 69)
				t->tm_year = yearset + 2000;
			else
				t->tm_year = yearset + 1900;
		}
		t->tm_year -= 1900;	/* Convert to UNIX time. */
		/* FALLTHROUGH */
	case 8:				/* MMDDhhmm */
		t->tm_mon = ATOI2(arg);
		--t->tm_mon;		/* Convert from 01-12 to 00-11 */
		t->tm_mday = ATOI2(arg);
		t->tm_hour = ATOI2(arg);
		t->tm_min = ATOI2(arg);
		break;
	case 4:				/* hhmm */
		t->tm_hour = ATOI2(arg);
		t->tm_min = ATOI2(arg);
		break;
	default:
		goto terr;
	}
	t->tm_isdst = -1;		/* Figure out DST. */
	timet = mktime(t);
	if (timet == -1)
terr:		errx(1, "out of range or illegal time specification: "
		    "[[[CC]YY]MMDD]hhmm[.SS]");
	return (timet);
}


/*
 * on interrupt, we inform the user how far we've gotten
 */
void
onintr(int signo)
{
	char str[1024], *ct, ctbuf[26];

	ct = ctime_r(&buf[0].ut_time, ctbuf);
	snprintf(str, sizeof str, "\ninterrupted %10.10s %8.8s \n",
	    ct, ct + 11);
	write(STDOUT_FILENO, str, strlen(str));
	if (signo == SIGINT)
		_exit(1);
}

void
usage(void)
{
	extern char *__progname;

	fprintf(stderr,
	    "usage: %s [-csT] [-d date] [-f file] [-h host]"
	    " [-n number] [-t tty] [user ...]\n", __progname);
	exit(1);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: last.c,v 1.50 2015/10/29 03:00:31 deraadt Exp $ */
2			/* $NetBSD: last.c,v 1.6 1994/12/24 16:49:02 cgd Exp $ */
3
4			/*
5			* Copyright (c) 1987, 1993, 1994
6			* The Regents of the University of California. All rights reserved.
7			*
8			* Redistribution and use in source and binary forms, with or without
9			* modification, are permitted provided that the following conditions
10			* are met:
11			* 1. Redistributions of source code must retain the above copyright
12			* notice, this list of conditions and the following disclaimer.
13			* 2. Redistributions in binary form must reproduce the above copyright
14			* notice, this list of conditions and the following disclaimer in the
15			* documentation and/or other materials provided with the distribution.
16			* 3. Neither the name of the University nor the names of its contributors
17			* may be used to endorse or promote products derived from this software
18			* without specific prior written permission.
19			*
20			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23			* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30			* SUCH DAMAGE.
31			*/
32
33			#include <sys/stat.h>
34
35			#include <ctype.h>
36			#include <err.h>
37			#include <fcntl.h>
38			#include <libgen.h>
39			#include <paths.h>
40			#include <signal.h>
41			#include <stdio.h>
42			#include <stdlib.h>
43			#include <string.h>
44			#include <time.h>
45			#include <unistd.h>
46			#include <limits.h>
47			#include <utmp.h>
48
49			#define NO 0 /* false/no */
50			#define YES 1 /* true/yes */
51			#define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
52
53			static struct utmp buf[1024]; /* utmp read buffer */
54
55			struct arg {
56			char name; / argument */
57			#define HOST_TYPE -2
58			#define TTY_TYPE -3
59			#define USER_TYPE -4
60			int type; /* type of arg */
61			struct arg next; / linked list pointer */
62			} *arglist;
63
64			struct ttytab {
65			time_t logout; /* log out time */
66			char tty[UT_LINESIZE + 1]; /* terminal name */
67			struct ttytabnext; / linked list pointer */
68			} *ttylist;
69
70			static time_t currentout; /* current logout value */
71			static long maxrec = -1; /* records to display */
72			static char file = _PATH_WTMP; / wtmp file */
73			static int fulltime = 0; /* Display seconds? */
74			static time_t snaptime = 0; /* report only at this time */
75			static int calculate = 0;
76			static int seconds = 0;
77
78			void addarg(int, char *);
79			struct ttytab addtty(char );
80			void hostconv(char *);
81			void onintr(int);
82			char ttyconv(char );
83			time_t dateconv(char *);
84			int want(struct utmp *, int);
85			void wtmp(void);
86			void checkargs(void);
87			void print_entry(const struct utmp *);
88			void usage(void);
89
90			#define NAME_WIDTH 9
91			#define HOST_WIDTH 24
92
93			#define SECSPERDAY (24 * 60 * 60)
94
95			int
96			main(int argc, char *argv[])
97			{
98			const char *errstr;
99			int ch, lastch = '\0', newarg = 1, prevoptind = 1;
100
101			if (pledge("stdio rpath flock cpath wpath", NULL) == -1)
102			err(1, "pledge");
103
104			while ((ch = getopt(argc, argv, "0123456789cf:h:n:st:d:T")) != -1) {
105			switch (ch) {
106			case '0': case '1': case '2': case '3': case '4':
107			case '5': case '6': case '7': case '8': case '9':
108			/*
109			* kludge: last was originally designed to take
110			* a number after a dash.
111			*/
112			if (newarg \|\| !isdigit(lastch))
113			maxrec = 0;
114			else if (maxrec > INT_MAX / 10)
115			usage();
116			maxrec = (maxrec * 10) + (ch - '0');
117			break;
118			case 'c':
119			calculate = 1;
120			break;
121			case 'f':
122			file = optarg;
123			break;
124			case 'h':
125			hostconv(optarg);
126			addarg(HOST_TYPE, optarg);
127			break;
128			case 'n':
129			maxrec = strtonum(optarg, 0, LONG_MAX, &errstr);
130			if (errstr != NULL)
131			errx(1, "number of lines is %s: %s", errstr,
132			optarg);
133			if (maxrec == 0)
134			exit(0);
135			break;
136			case 's':
137			seconds = 1;
138			break;
139			case 't':
140			addarg(TTY_TYPE, ttyconv(optarg));
141			break;
142			case 'd':
143			snaptime = dateconv(optarg);
144			break;
145			case 'T':
146			fulltime = 1;
147			break;
148			default:
149			usage();
150			}
151			lastch = ch;
152			newarg = optind != prevoptind;
153			prevoptind = optind;
154			}
155			if (maxrec == 0)
156			exit(0);
157
158			if (argc) {
159			setvbuf(stdout, NULL, _IOLBF, 0);
160			for (argv += optind; *argv; ++argv) {
161			#define COMPATIBILITY
162			#ifdef COMPATIBILITY
163			/* code to allow "last p5" to work */
164			addarg(TTY_TYPE, ttyconv(*argv));
165			#endif
166			addarg(USER_TYPE, *argv);
167			}
168			}
169
170			checkargs();
171			wtmp();
172			exit(0);
173			}
174
175			/*
176			* if snaptime is set, print warning if usernames, or -t or -h
177			* flags are also provided
178			*/
179			void
180			checkargs(void)
181			{
182			int ttyflag = 0;
183			struct arg *step;
184
185			if (!snaptime \|\| !arglist)
186			return;
187
188			for (step = arglist; step; step = step->next)
189			switch (step->type) {
190			case HOST_TYPE:
191			(void)fprintf(stderr,
192			"Warning: Ignoring hostname flag\n");
193			break;
194			case TTY_TYPE:
195			if (!ttyflag) { /* don't print this twice */
196			(void)fprintf(stderr,
197			"Warning: Ignoring tty flag\n");
198			ttyflag = 1;
199			}
200			break;
201			case USER_TYPE:
202			(void)fprintf(stderr,
203			"Warning: Ignoring username[s]\n");
204			break;
205			default:
206			break;
207			/* PRINT NOTHING */
208			}
209			}
210
211			void
212			print_entry(const struct utmp *bp)
213			{
214			printf("%-.s %-.s %-.s ",
215			NAME_WIDTH, UT_NAMESIZE, bp->ut_name,
216			UT_LINESIZE, UT_LINESIZE, bp->ut_line,
217			HOST_WIDTH, UT_HOSTSIZE, bp->ut_host);
218
219			if (seconds)
220			printf("%lld", (long long)bp->ut_time);
221			else {
222			struct tm *tm;
223
224			tm = localtime(&bp->ut_time);
225			if (tm == NULL) {
226			/* bogus entry? format as epoch time... */
227			printf("%lld", (long long)bp->ut_time);
228			} else {
229			char tim[40];
230
231			strftime(tim, sizeof tim,
232			fulltime ? "%a %b %d %H:%M:%S" : "%a %b %d %H:%M",
233			tm);
234			printf("%s", tim);
235			}
236			}
237			}
238
239
240			/*
241			* read through the wtmp file
242			*/
243			void
244			wtmp(void)
245			{
246			time_t delta, total = 0;
247			int timesize, wfd, snapfound = 0;
248			char ct, crmsg = "invalid";
249			struct utmp *bp;
250			struct stat stb;
251			ssize_t bytes;
252			off_t bl;
253			struct ttytab *T;
254
255			if ((wfd = open(file, O_RDONLY, 0)) < 0 \|\| fstat(wfd, &stb) == -1)
256			err(1, "%s", file);
257			bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf);
258
259			if (fulltime)
260			timesize = 8; /* HH:MM:SS */
261			else
262			timesize = 5; /* HH:MM */
263
264			(void)time(&buf[0].ut_time);
265			(void)signal(SIGINT, onintr);
266			(void)signal(SIGQUIT, onintr);
267
268			while (--bl >= 0) {
269			if (lseek(wfd, bl * sizeof(buf), SEEK_SET) == -1 \|\|
270			(bytes = read(wfd, buf, sizeof(buf))) == -1)
271			err(1, "%s", file);
272			for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) {
273			/*
274			* if the terminal line is '~', the machine stopped.
275			* see utmp(5) for more info.
276			*/
277			if (bp->ut_line[0] == '~' && !bp->ut_line[1]) {
278			/* everybody just logged out */
279			for (T = ttylist; T; T = T->next)
280			T->logout = -bp->ut_time;
281			currentout = -bp->ut_time;
282			crmsg = strncmp(bp->ut_name, "shutdown",
283			UT_NAMESIZE) ? "crash" : "shutdown";
284
285			/*
286			* if we're in snapshot mode, we want to
287			* exit if this shutdown/reboot appears
288			* while we we are tracking the active
289			* range
290			*/
291			if (snaptime && snapfound) {
292			close(wfd);
293			return;
294			}
295
296			/*
297			* don't print shutdown/reboot entries
298			* unless flagged for
299			*/
300			if (want(bp, NO)) {
301			print_entry(bp);
302			printf("\n");
303			if (maxrec != -1 && !--maxrec) {
304			close(wfd);
305			return;
306			}
307			}
308			continue;
309			}
310
311			/*
312			* if the line is '{' or '\|', date got set; see
313			* utmp(5) for more info.
314			*/
315			if ((bp->ut_line[0] == '{' \|\| bp->ut_line[0] == '\|') &&
316			!bp->ut_line[1]) {
317			if (want(bp, NO)) {
318			print_entry(bp);
319			printf("\n");
320			if (maxrec && !--maxrec) {
321			close(wfd);
322			return;
323			}
324			}
325			continue;
326			}
327
328			/* find associated tty */
329			for (T = ttylist;; T = T->next) {
330			if (!T) {
331			/* add new one */
332			T = addtty(bp->ut_line);
333			break;
334			}
335			if (!strncmp(T->tty, bp->ut_line, UT_LINESIZE))
336			break;
337			}
338
339			/*
340			* print record if not in snapshot mode and wanted
341			* or in snapshot mode and in snapshot range
342			*/
343			if (bp->ut_name[0] &&
344			((want(bp, YES)) \|\| (bp->ut_time < snaptime &&
345			(T->logout > snaptime \|\| !T->logout \|\|
346			T->logout < 0)))) {
347			snapfound = 1;
348			print_entry(bp);
349			printf(" ");
350
351			if (!T->logout)
352			puts(" still logged in");
353			else {
354			if (T->logout < 0) {
355			T->logout = -T->logout;
356			printf("- %s", crmsg);
357			} else {
358			if (seconds)
359			printf("- %lld",
360			(long long)T->logout);
361			else
362			printf("- %.s",
363			timesize, timesize,
364			ctime(&T->logout)+11);
365			}
366			delta = T->logout - bp->ut_time;
367			if (seconds)
368			printf(" (%lld)\n",
369			(long long)delta);
370			else {
371			if (delta < SECSPERDAY)
372			printf(" (%.s)\n",
373			timesize, timesize,
374			asctime(gmtime(&delta))+11);
375			else
376			printf(" (%lld+%.s)\n",
377			(long long)delta / SECSPERDAY,
378			timesize, timesize,
379			asctime(gmtime(&delta))+11);
380			}
381			if (calculate)
382			total += delta;
383			}
384			if (maxrec != -1 && !--maxrec) {
385			close(wfd);
386			return;
387			}
388			}
389			T->logout = bp->ut_time;
390			}
391			}
392			close(wfd);
393			if (calculate) {
394			if ((total / SECSPERDAY) > 0) {
395			int days = (total / SECSPERDAY);
396			total -= (days * SECSPERDAY);
397
398			printf("\nTotal time: %d days, %.s\n",
399			days, timesize, timesize,
400			asctime(gmtime(&total))+11);
401			} else
402			printf("\nTotal time: %.s\n",
403			timesize, timesize,
404			asctime(gmtime(&total))+11);
405			}
406			ct = ctime(&buf[0].ut_time);
407			printf("\n%s begins %10.10s %.s %4.4s\n", basename(file), ct,
408			timesize, timesize, ct + 11, ct + 20);
409			}
410
411			/*
412			* see if want this entry
413			*/
414			int
415			want(struct utmp *bp, int check)
416			{
417			struct arg *step;
418
419			if (check) {
420			/*
421			* some entries, such as ftp and uucp, will
422			* include process name plus id; exclude entries
423			* that start with 'console' and 'tty' from
424			* having the process id stripped.
425			*/
426			if ((strncmp(bp->ut_line, "console", strlen("console")) != 0) &&
427			(strncmp(bp->ut_line, "tty", strlen("tty")) != 0)) {
428			char *s;
429			for (s = bp->ut_line;
430			s != '\0' && !isdigit((unsigned char)s); s++)
431			;
432			*s = '\0';
433			}
434			}
435
436			if (snaptime) /* if snaptime is set, return NO */
437			return (NO);
438
439			if (!arglist)
440			return (YES);
441
442			for (step = arglist; step; step = step->next)
443			switch (step->type) {
444			case HOST_TYPE:
445			if (!strncasecmp(step->name, bp->ut_host, UT_HOSTSIZE))
446			return (YES);
447			break;
448			case TTY_TYPE:
449			if (!strncmp(step->name, bp->ut_line, UT_LINESIZE))
450			return (YES);
451			break;
452			case USER_TYPE:
453			if (!strncmp(step->name, bp->ut_name, UT_NAMESIZE))
454			return (YES);
455			break;
456			}
457
458			return (NO);
459			}
460
461			/*
462			* add an entry to a linked list of arguments
463			*/
464			void
465			addarg(int type, char *arg)
466			{
467			struct arg *cur;
468
469			if (!(cur = malloc((u_int)sizeof(struct arg))))
470			err(1, "malloc failure");
471			cur->next = arglist;
472			cur->type = type;
473			cur->name = arg;
474			arglist = cur;
475			}
476
477			/*
478			* add an entry to a linked list of ttys
479			*/
480			struct ttytab *
481			addtty(char *ttyname)
482			{
483			struct ttytab *cur;
484
485			if (!(cur = malloc((u_int)sizeof(struct ttytab))))
486			err(1, "malloc failure");
487			cur->next = ttylist;
488			cur->logout = currentout;
489			memmove(cur->tty, ttyname, UT_LINESIZE);
490			return (ttylist = cur);
491			}
492
493			/*
494			* convert the hostname to search pattern; if the supplied host name
495			* has a domain attached that is the same as the current domain, rip
496			* off the domain suffix since that's what login(1) does.
497			*/
498			void
499			hostconv(char *arg)
500			{
501			static char *hostdot, name[HOST_NAME_MAX+1];
502			static int first = 1;
503			char *argdot;
504
505			if (!(argdot = strchr(arg, '.')))
506			return;
507			if (first) {
508			first = 0;
509			if (gethostname(name, sizeof(name)))
510			err(1, "gethostname");
511			hostdot = strchr(name, '.');
512			}
513			if (hostdot && !strcasecmp(hostdot, argdot))
514			*argdot = '\0';
515			}
516
517			/*
518			* convert tty to correct name.
519			*/
520			char *
521			ttyconv(char *arg)
522			{
523			size_t len = 8;
524			char *mval;
525
526			/*
527			* kludge -- we assume that all tty's end with
528			* a two character suffix.
529			*/
530			if (strlen(arg) == 2) {
531			/* either 6 for "ttyxx" or 8 for "console" */
532			if (!(mval = malloc(len)))
533			err(1, "malloc failure");
534			if (!strcmp(arg, "co"))
535			(void)strlcpy(mval, "console", len);
536			else
537			snprintf(mval, len, "tty%s", arg);
538			return (mval);
539			}
540			if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1))
541			return (arg + 5);
542			return (arg);
543			}
544
545			/*
546			* Convert the snapshot time in command line given in the format
547			* [[[CC]YY]MMDD]hhmm[.SS]] to a time_t.
548			* Derived from atime_arg1() in usr.bin/touch/touch.c
549			*/
550			time_t
551			dateconv(char *arg)
552			{
553			time_t timet;
554			struct tm *t;
555			int yearset;
556			char *p;
557
558			/* Start with the current time. */
559			if (time(&timet) < 0)
560			err(1, "time");
561			if ((t = localtime(&timet)) == NULL)
562			err(1, "localtime");
563
564			/* [[[CC]YY]MMDD]hhmm[.SS] */
565			if ((p = strchr(arg, '.')) == NULL)
566			t->tm_sec = 0; /* Seconds defaults to 0. */
567			else {
568			if (strlen(p + 1) != 2)
569			goto terr;
570			*p++ = '\0';
571			t->tm_sec = ATOI2(p);
572			}
573
574			yearset = 0;
575			switch (strlen(arg)) {
576			case 12: /* CCYYMMDDhhmm */
577			t->tm_year = ATOI2(arg);
578			t->tm_year *= 100;
579			yearset = 1;
580			/* FALLTHROUGH */
581			case 10: /* YYMMDDhhmm */
582			if (yearset) {
583			yearset = ATOI2(arg);
584			t->tm_year += yearset;
585			} else {
586			yearset = ATOI2(arg);
587			if (yearset < 69)
588			t->tm_year = yearset + 2000;
589			else
590			t->tm_year = yearset + 1900;
591			}
592			t->tm_year -= 1900; /* Convert to UNIX time. */
593			/* FALLTHROUGH */
594			case 8: /* MMDDhhmm */
595			t->tm_mon = ATOI2(arg);
596			--t->tm_mon; /* Convert from 01-12 to 00-11 */
597			t->tm_mday = ATOI2(arg);
598			t->tm_hour = ATOI2(arg);
599			t->tm_min = ATOI2(arg);
600			break;
601			case 4: /* hhmm */
602			t->tm_hour = ATOI2(arg);
603			t->tm_min = ATOI2(arg);
604			break;
605			default:
606			goto terr;
607			}
608			t->tm_isdst = -1; /* Figure out DST. */
609			timet = mktime(t);
610			if (timet == -1)
611			terr: errx(1, "out of range or illegal time specification: "
612			"[[[CC]YY]MMDD]hhmm[.SS]");
613			return (timet);
614			}
615
616
617			/*
618			* on interrupt, we inform the user how far we've gotten
619			*/
620			void
621			onintr(int signo)
622			{
623			char str[1024], *ct, ctbuf[26];
624
625			ct = ctime_r(&buf[0].ut_time, ctbuf);
626			snprintf(str, sizeof str, "\ninterrupted %10.10s %8.8s \n",
627			ct, ct + 11);
628			write(STDOUT_FILENO, str, strlen(str));
629			if (signo == SIGINT)
630			_exit(1);
631			}
632
633			void
634			usage(void)
635			{
636			extern char *__progname;
637
638			fprintf(stderr,
639			"usage: %s [-csT] [-d date] [-f file] [-h host]"
640			" [-n number] [-t tty] [user ...]\n", __progname);
641			exit(1);
642			}