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- /*
- * Copyright (c) 1987 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. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. 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.
- */
-
- #ifndef lint
- char copyright[] =
- "@(#) Copyright (c) 1987 Regents of the University of California.\n\
- All rights reserved.\n";
- #endif /* not lint */
-
- #ifndef lint
- static char sccsid[] = "@(#)last.c 5.18 (Berkeley) 3/1/91";
- #endif /* not lint */
-
- /*
- * last
- */
- #include <sys/param.h>
- #include <sys/stat.h>
- #include <sys/file.h>
- #include <signal.h>
- #include <time.h>
- #include <utmp.h>
- #include <stdio.h>
- #include <paths.h>
-
- #define SECDAY (24*60*60) /* seconds in a day */
- #define NO 0 /* false/no */
- #define YES 1 /* true/yes */
-
- static struct utmp buf[1024]; /* utmp read buffer */
-
- typedef 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 */
- } ARG;
- ARG *arglist; /* head of linked list */
-
- typedef struct ttytab {
- long logout; /* log out time */
- char tty[UT_LINESIZE + 1]; /* terminal name */
- struct ttytab *next; /* linked list pointer */
- } TTY;
- TTY *ttylist; /* head of linked list */
-
- static long currentout, /* current logout value */
- maxrec; /* records to display */
- static char *file = _PATH_WTMP; /* wtmp file */
-
- main(argc, argv)
- int argc;
- char **argv;
- {
- extern int optind;
- extern char *optarg;
- int ch;
- long atol();
- char *p, *ttyconv();
-
- maxrec = -1;
- while ((ch = getopt(argc, argv, "0123456789f:h:t:")) != EOF)
- switch((char)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 (maxrec == -1) {
- p = argv[optind - 1];
- if (p[0] == '-' && p[1] == ch && !p[2])
- maxrec = atol(++p);
- else
- maxrec = atol(argv[optind] + 1);
- if (!maxrec)
- exit(0);
- }
- break;
- case 'f':
- file = optarg;
- break;
- case 'h':
- hostconv(optarg);
- addarg(HOST_TYPE, optarg);
- break;
- case 't':
- addarg(TTY_TYPE, ttyconv(optarg));
- break;
- case '?':
- default:
- fputs("usage: last [-#] [-f file] [-t tty] [-h hostname] [user ...]\n", stderr);
- exit(1);
- }
-
- if (argc) {
- setlinebuf(stdout);
- 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);
- }
- }
- wtmp();
- exit(0);
- }
-
- /*
- * wtmp --
- * read through the wtmp file
- */
- wtmp()
- {
- register struct utmp *bp; /* current structure */
- register TTY *T; /* tty list entry */
- struct stat stb; /* stat of file for size */
- long bl, delta, /* time difference */
- lseek(), time();
- int bytes, wfd;
- char *ct, *crmsg,
- *asctime(), *ctime(), *strcpy();
- TTY *addtty();
- void onintr();
-
- if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1) {
- perror(file);
- exit(1);
- }
- bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf);
-
- (void)time(&buf[0].ut_time);
- (void)signal(SIGINT, onintr);
- (void)signal(SIGQUIT, onintr);
-
- while (--bl >= 0) {
- if (lseek(wfd, (long)(bl * sizeof(buf)), L_SET) == -1 ||
- (bytes = read(wfd, (char *)buf, sizeof(buf))) == -1) {
- fprintf(stderr, "last: %s: ", file);
- perror((char *)NULL);
- exit(1);
- }
- 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 (want(bp, NO)) {
- ct = ctime(&bp->ut_time);
- printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n", UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, UT_LINESIZE, UT_LINESIZE, bp->ut_line, UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, ct, ct + 11);
- if (maxrec != -1 && !--maxrec)
- 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)) {
- ct = ctime(&bp->ut_time);
- printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n", UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, UT_LINESIZE, UT_LINESIZE, bp->ut_line, UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, ct, ct + 11);
- if (maxrec && !--maxrec)
- 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;
- }
- if (bp->ut_name[0] && want(bp, YES)) {
- ct = ctime(&bp->ut_time);
- printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s ", UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, UT_LINESIZE, UT_LINESIZE, bp->ut_line, UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, ct, ct + 11);
- if (!T->logout)
- puts(" still logged in");
- else {
- if (T->logout < 0) {
- T->logout = -T->logout;
- printf("- %s", crmsg);
- }
- else
- printf("- %5.5s", ctime(&T->logout)+11);
- delta = T->logout - bp->ut_time;
- if (delta < SECDAY)
- printf(" (%5.5s)\n", asctime(gmtime(&delta))+11);
- else
- printf(" (%ld+%5.5s)\n", delta / SECDAY, asctime(gmtime(&delta))+11);
- }
- if (maxrec != -1 && !--maxrec)
- return;
- }
- T->logout = bp->ut_time;
- }
- }
- ct = ctime(&buf[0].ut_time);
- printf("\nwtmp begins %10.10s %5.5s \n", ct, ct + 11);
- }
-
- /*
- * want --
- * see if want this entry
- */
- want(bp, check)
- register struct utmp *bp;
- int check;
- {
- register ARG *step;
-
- if (check)
- /*
- * when uucp and ftp log in over a network, the entry in
- * the utmp file is the name plus their process id. See
- * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information.
- */
- if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1))
- bp->ut_line[3] = '\0';
- else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1))
- bp->ut_line[4] = '\0';
- 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);
- }
-
- /*
- * addarg --
- * add an entry to a linked list of arguments
- */
- addarg(type, arg)
- int type;
- char *arg;
- {
- register ARG *cur;
- char *malloc();
-
- if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) {
- fputs("last: malloc failure.\n", stderr);
- exit(1);
- }
- cur->next = arglist;
- cur->type = type;
- cur->name = arg;
- arglist = cur;
- }
-
- /*
- * addtty --
- * add an entry to a linked list of ttys
- */
- TTY *
- addtty(ttyname)
- char *ttyname;
- {
- register TTY *cur;
- char *malloc();
-
- if (!(cur = (TTY *)malloc((u_int)sizeof(TTY)))) {
- fputs("last: malloc failure.\n", stderr);
- exit(1);
- }
- cur->next = ttylist;
- cur->logout = currentout;
- bcopy(ttyname, cur->tty, UT_LINESIZE);
- return(ttylist = cur);
- }
-
- /*
- * hostconv --
- * 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.
- */
- hostconv(arg)
- char *arg;
- {
- static int first = 1;
- static char *hostdot, name[MAXHOSTNAMELEN];
- char *argdot, *index();
-
- if (!(argdot = index(arg, '.')))
- return;
- if (first) {
- first = 0;
- if (gethostname(name, sizeof(name))) {
- perror("last: gethostname");
- exit(1);
- }
- hostdot = index(name, '.');
- }
- if (hostdot && !strcasecmp(hostdot, argdot))
- *argdot = '\0';
- }
-
- /*
- * ttyconv --
- * convert tty to correct name.
- */
- char *
- ttyconv(arg)
- char *arg;
- {
- char *mval, *malloc(), *strcpy();
-
- /*
- * 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((u_int)8))) {
- fputs("last: malloc failure.\n", stderr);
- exit(1);
- }
- if (!strcmp(arg, "co"))
- (void)strcpy(mval, "console");
- else {
- (void)strcpy(mval, "tty");
- (void)strcpy(mval + 3, arg);
- }
- return(mval);
- }
- if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1))
- return(arg + 5);
- return(arg);
- }
-
- /*
- * onintr --
- * on interrupt, we inform the user how far we've gotten
- */
- void
- onintr(signo)
- int signo;
- {
- char *ct, *ctime();
-
- ct = ctime(&buf[0].ut_time);
- printf("\ninterrupted %10.10s %5.5s \n", ct, ct + 11);
- if (signo == SIGINT)
- exit(1);
- (void)fflush(stdout); /* fix required for rsh */
- }
-