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increased TTYS to 500, read buffer to 1K; rewrote to require
[unix-history] / usr / src / usr.bin / last / last.c
/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1980 Regents of the University of California.\n\
All rights reserved.\n";
#endif not lint
#ifndef lint
static char sccsid[] = "@(#)last.c 5.7 (Berkeley) %G%";
#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>
#define MAXTTYS 500 /* max ttys last can handle */
#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 */
#define HMAX sizeof(buf[0].ut_host) /* size of utmp host field */
#define LMAX sizeof(buf[0].ut_line) /* size of utmp tty field */
#define NMAX sizeof(buf[0].ut_name) /* size of utmp name field */
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 *head; /* head of linked list */
typedef struct ttytab {
long logout; /* log out time */
char tty[LMAX + 1]; /* terminal name */
} TTYS;
static TTYS tab[MAXTTYS + 1]; /* tty table */
static long maxrec; /* records to display */
static char *file = "/usr/adm/wtmp"; /* wtmp file */
main(argc, argv)
int argc;
char **argv;
{
extern int optind;
extern char *optarg;
int ch;
char *malloc();
long atol();
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)
maxrec = atol(argv[optind - 1] + 1);
break;
case 'f':
file = optarg;
break;
case 'h':
hostconv(optarg);
addarg(HOST_TYPE, optarg);
break;
case 't':
{
char *mval, *strcpy();
/*
* kludge -- we assume that all tty's end with
* a two character suffix.
*/
if (strlen(optarg) == 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(optarg, "co"))
(void)strcpy(mval, "console");
else {
(void)strcpy(mval, "tty");
(void)strcpy(mval + 3, optarg);
}
addarg(TTY_TYPE, mval);
}
else
addarg(TTY_TYPE, optarg);
break;
}
case '?':
default:
fputs("usage: last [-#] [-f file] [-t tty] [-h hostname] [user ...]\n", stderr);
exit(1);
}
for (argv += optind; *argv; ++argv)
addarg(USER_TYPE, *argv);
wtmp();
exit(0);
}
/*
* wtmp --
* read through the wtmp file
*/
static
wtmp()
{
register struct utmp *bp; /* current structure */
register TTYS *T; /* table entry */
struct stat stb; /* stat of file for size */
long bl, delta, /* time difference */
lseek(), time();
int bytes, wfd,
onintr();
char *ct, *crmsg,
*asctime(), *ctime(), *strcpy();
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);
tab[MAXTTYS].logout = -1; /* end flag value */
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 (!strncmp(bp->ut_line, "~", LMAX)) {
for (T = tab; T->logout != -1; ++T)
T->logout = -bp->ut_time;
crmsg = strncmp(bp->ut_name, "shutdown", NMAX)
? "crash" : "down ";
if (!bp->ut_name[0])
(void)strcpy(bp->ut_name, "reboot");
if (want(bp, NO)) {
ct = ctime(&bp->ut_time);
printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n", NMAX, NMAX, bp->ut_name, LMAX, LMAX, bp->ut_line, HMAX, HMAX, bp->ut_host, ct, ct + 11);
if (maxrec && !--maxrec)
return;
}
continue;
}
for (T = tab;;) { /* find assoc. tty */
if (T->logout <= 0) { /* unused entry */
bcopy(bp->ut_line, T->tty, LMAX);
break;
}
if (!strncmp(T->tty, bp->ut_line, LMAX))
break;
if ((++T)->logout == -1) {
fputs("last: too many terminals.\n", stderr);
exit(1);
}
}
if (bp->ut_name[0] && want(bp, YES)) {
ct = ctime(&bp->ut_time);
printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s ", NMAX, NMAX, bp->ut_name, LMAX, LMAX, bp->ut_line, HMAX, HMAX, 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
*/
static
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", 3))
bp->ut_line[3] = '\0';
else if (!strncmp(bp->ut_line, "uucp", 4))
bp->ut_line[4] = '\0';
if (!head)
return(YES);
for (step = head; step; step = step->next)
switch(step->type) {
case HOST_TYPE:
if (!strncasecmp(step->name, bp->ut_host, HMAX))
return(YES);
break;
case TTY_TYPE:
if (!strncmp(step->name, bp->ut_line, LMAX))
return(YES);
break;
case USER_TYPE:
if (!strncmp(step->name, bp->ut_name, NMAX))
return(YES);
break;
}
return(NO);
}
/*
* addarg --
* add an entry to a linked list of arguments
*/
static
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 = head;
cur->type = type;
cur->name = arg;
head = 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.
*/
static
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';
}
/*
* onintr --
* on interrupt, we inform the user how far we've gotten
*/
static
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 */
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.