+/*
+ * 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 */
+}
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