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well, I started looking at this to add a flag to allow the use of a
[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 5.4 (Berkeley) %G%";
#endif not lint
/*
* last
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <signal.h>
#include <time.h>
#include <pwd.h>
#include <utmp.h>
#include <strings.h>
#include <stdio.h>
#include <ctype.h>
#define MAXTTYS 200 /* 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[500]; /* 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 */
#define lineq(a,b) (!strncmp(a,b,LMAX))
#define nameq(a,b) (!strncmp(a,b,NMAX))
#define hosteq(a,b) (!strncmp(a,b,HMAX))
typedef struct ttytab {
long logout; /* log out time */
char tty[LMAX + 1]; /* terminal name */
} TTYS;
static TTYS tab[MAXTTYS + 1]; /* tty table */
static char **sargs; /* start of selections args */
main(argc,argv)
int argc;
char **argv;
{
register struct utmp *bp; /* current structure */
register TTYS *T; /* table entry */
register long maxrec = -1; /* records to display */
register int indx; /* array offsets */
struct stat stb; /* stat of file for size */
long delta, /* time difference */
atol(), lseek(), time();
int bl, /* reads to do */
bytes, /* bytes read */
wtmp, /* wtmp file descriptor */
onintr();
char *ct, /* ctime return */
*crmsg, /* crash message */
*file, /* user specified file */
*asctime(), *ctime(), *strspl();
file = "/usr/adm/wtmp";
for (--argc,sargs = argv = ++argv,indx = 0;indx < argc;++indx) {
if (argv[indx][0] == '-' && isdigit(argv[indx][1])) {
if ((maxrec = atol(argv[indx] + 1)) <= 0) {
fputs("last: bad line count value.\n",stderr);
exit(1);
}
++sargs;
continue;
}
if (!strncmp(argv[indx],"-f",2)) {
if (argv[indx][2]) {
file = argv[indx] + 2;
++sargs;
}
else if (++indx == argc) {
fputs("last: option requires an argument -- f\n",stderr);
exit(1);
}
else {
file = argv[indx];
sargs += 2;
}
continue;
}
if (strlen(argv[indx]) > 2)
continue;
if (!strcmp(argv[indx],"~"))
continue;
if (getpwnam(argv[indx]))
continue;
argv[indx] = strspl(argv[indx]);
}
if ((wtmp = open(file,O_RDONLY,0)) < 0 || fstat(wtmp,&stb) == -1) {
perror(file);
exit(1);
}
bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf);
time(&buf[0].ut_time);
signal(SIGINT,onintr);
signal(SIGQUIT,onintr);
tab[MAXTTYS].logout = -1; /* end flag value */
while (--bl >= 0) {
if (lseek(wtmp,(long)(bl * sizeof(buf)),L_SET) == -1 || (bytes = read(wtmp,(char *)buf,sizeof(buf))) == -1) {
perror(file);
exit(1);
}
for (bp = &buf[bytes / sizeof(buf[0]) - 1];bp >= buf;--bp) {
if (lineq(bp->ut_line,"~")) {
/*
* if the name is empty and the terminal
* line is '~', it's a shutdown of some
* sort; see utmp(5) for more info.
*/
for (T = tab;T->logout != -1;++T)
T->logout = -bp->ut_time;
crmsg = nameq(bp->ut_name,"shutdown") ? "down " : "crash";
if (!bp->ut_name[0])
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 != -1 && !--maxrec)
exit(0);
}
continue;
}
for (T = tab;;) {
if (T->logout <= 0) {
bcopy(bp->ut_line,T->tty,LMAX);
break;
}
if (lineq(T->tty,bp->ut_line))
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)
exit(0);
}
T->logout = bp->ut_time;
}
}
ct = ctime(&buf[0].ut_time);
printf("\nwtmp begins %10.10s %5.5s \n",ct,ct + 11);
exit(0);
}
onintr(signo)
int signo;
{
char *ct,
*ctime();
ct = ctime(&buf[0].ut_time);
printf("\ninterrupted %10.10s %5.5s \n",ct,ct + 11);
fflush(stdout); /* fix required for rsh */
if (signo == SIGINT)
exit(1);
}
want(bp,check)
register struct utmp *bp;
int check;
{
register char **indx;
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 (!*sargs)
return(YES);
for (indx = sargs;*indx;++indx)
if (nameq(*indx,bp->ut_name) || lineq(*indx,bp->ut_line))
return(YES);
return(NO);
}
char *
strspl(str)
char *str;
{
register char *res;
char *malloc();
if (!(res = malloc((u_int)(4 + strlen(str))))) {
fputs("last: malloc failure.\n",stderr);
exit(1);
}
strcpy(res,"tty");
strcpy(res + 3,str);
return(res);
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.