kimcm@olamb.UUCP (Kim Chr. Madsen) (09/05/86)
[ Never eat anything bigger than your head! ]
For what it's worth I have made a Yet-Another-Who-Program, with the following
enhancements to the standard who:
* It gives you nice little headers telling you the meaning
of each colomn.
* It tells you how many users are on the system right now.
* It tells you how long time any user has left his keyboard
untouched. (originally this was used to a timeout program.)
* It indicates the invoking user with a asterix on the tty-entry
on which the call was made. (nice little feature if you're
logged in more than once).
The program is tested to run under UNIX SVR2 and XENIX III.
Best Regards
Kim Chr. Madsen
kimcm@olamb.UUCP
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/*
*
* Defines some characteristics about the system.
*
* use this if you miss the ident.h header file.
* install in /usr/include/local/ident.h
*
* (c) 1986 by Kim Chr. Madsen at AmbraSoft A/S.
*/
static char *myname = "AT&T 3B2/400"; /* change to your machinetype */
-----------------------------CUT AGAIN---------------------------------------
/*
* who - YAWP
*
* Call:
* who
* who am I
* who are you
*
* Programmed by:
* Kim Chr. Madsen, AmbraSoft A/S.
* June 16 1986
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <ctype.h>
#include <signal.h>
#include <utmp.h>
#include <fcntl.h>
#include <pwd.h>
#include <time.h>
#include <local/ident.h>
#define UTMP "/etc/utmp" /* Name of utmp file */
#define TTYLEN 8 /* Length of tty entry in utmp */
#define NAMELEN 8 /* Length of name entry in utmp */
#define BUF 50
main(argc,argv)
int argc;
char *argv[];
{
extern struct passwd *getpwnam();
extern void p_time();
extern void whoami();
extern void whoareyou();
char device[BUF];
int fd;
int users = 0;
long clock;
struct stat statbuf;
struct utmp entry;
if (strcmp(argv[0],"whoami") == 0) whoami();
if (argc==3) {
if (strcmp(argv[2],"i")==0 || strcmp(argv[2],"I")==0)
whoami();
if (strcmp(argv[2],"you")==0 || strcmp(argv[2],"You")==0)
whoareyou();
}
if ((fd=open(UTMP,O_RDONLY)) < 0) {
fprintf(stderr,"Cannot open utmp");
exit(1);
}
printf("USER: TTY: ON SINCE: IDLETIME:\n");
while (read(fd,&entry,sizeof(entry)) > 0) {
if (getpwnam(entry.ut_name) == NULL)
continue; /* Not a user process! */
sprintf(device,"/dev/%s",entry.ut_line);
if (stat(device,&statbuf) < 0) {
fprintf(stderr,"Cannot stat ",device);
exit(2);
}
users++;
time(&clock);
printf("%s\t%s\t",entry.ut_name,entry.ut_line);
p_time(entry.ut_time,0);
p_time(clock-statbuf.st_atime,1);
if (strcmp(entry.ut_name,getlogin()) == 0 &&
strcmp(device,ttyname(2)) == 0) printf(" *");
putchar('\n');
}
printf("No. of users: %d\n",users);
if (close(fd) < 0) {
fprintf(stderr,"cannot close");
exit(3);
}
}
void p_time(sec,mode)
long sec;
short mode;
{
long min, hour, day;
extern struct tm *localtime();
struct tm *clock;
if (mode) {
min = sec/60;
sec -= min*60;
hour = min/60;
min -= hour*60;
day = hour/24;
hour -= day*24;
if (day) printf("%d %s and ",day,(day>1)?"days":"day");
if (hour) printf("%2d:",hour); else printf(" ");
if (min<10) printf("0%d:",min); else printf("%d:",min);
if (sec<10) printf("0%d",sec); else printf("%d",sec);
} else {
clock = localtime(&sec);
switch (clock->tm_mon) {
case 0: printf("Jan "); break;
case 1: printf("Feb "); break;
case 2: printf("Mar "); break;
case 3: printf("Apr "); break;
case 4: printf("May "); break;
case 5: printf("Jun "); break;
case 6: printf("Jul "); break;
case 7: printf("Aug "); break;
case 8: printf("Sep "); break;
case 9: printf("Oct "); break;
case 10: printf("Nov "); break;
case 11: printf("Dec "); break;
}
printf("%2d ",clock->tm_mday);
printf("%2d:",clock->tm_hour);
if (clock->tm_min<10) printf("0%d ",clock->tm_min);
else printf("%d ",clock->tm_min);
}
}
void whoami()
{
extern struct passwd *getpwuid();
struct passwd *buf;
extern int getuid();
extern int geteuid();
extern int getgid();
extern int getegid();
int i;
int uid;
int euid;
if ((uid=getuid()) < 0) {
fprintf(stderr,"Something is rotten uid = %d\n",uid);
exit(1);
}
if ((buf = getpwuid(uid)) == (struct passwd *) NULL) {
fprintf(stderr,"Go away you don't exist...\n");
exit(1);
}
if ((euid=geteuid()) != uid) {
if (euid<0) {
printf("I see you have a problem your euid is %d\n",euid);
printf("and that should be next to impossible!!!\n");
printf("But your login name is: %s\n",getlogin());
exit(1);
}
printf("You seems to have a split-personality, but here\n");
printf("are the informations I could gather:\n\n");
} else {
printf("In case you suffer of amnesia, I can only give you\n");
printf("the following informations:\n\n");
}
printf("uid: %d\n",uid);
if (euid != uid) printf("euid: %d\n",euid);
printf("gid: %d\n",getgid());
if (getgid() != getegid()) printf("egid: %d\n",getegid());
printf("login: %s\n",getlogin());
printf("name: ");
for (i=0;buf->pw_gecos[i] != '\0' && buf->pw_gecos[i] != ','; i++)
putchar(buf->pw_gecos[i]);
putchar('\n');
exit(0);
}
void whoareyou()
{
printf("The information avaiable of the machine is:\n\n");
printf("%s\n",myname);
exit(0);
}