115 lines
4.9 KiB
C
115 lines
4.9 KiB
C
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/***************************************************************************
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* Program: lastlogin (c)1987 ICUS Computer Group *
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* By: Lenny Tropiano ...{ihnp4,mtune}!icus!lenny *
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* *
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* Program intent: This will allow programs like 'finger' and 'last' to *
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* lookup in the file /usr/adm/lastlogin.log and see *
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* when a particular user has logged-in. This saves *
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* the necessity to keep /etc/wtmp around for a long *
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* period of time. *
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* *
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* This program can be used/modified and redistributed *
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* I declare it PUBLIC DOMAIN. Please give me credit *
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* when credit is due. *
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* *
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* AT&T 3B1 compiling instructions for shared-libaries: *
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* *
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* $ cc -c -O lastlogin.c *
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* $ ld -s -o lastlogin lastlogin.o /lib/shlib.ifile /lib/crt0s.o *
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* $ mv lastlogin /etc *
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* $ su *
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* Password: *
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* # chown adm /etc/lastlogin /usr/adm *
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* # chgrp adm /etc/lastlogin /usr/adm *
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* # chmod 4755 /etc/lastlogin *
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* *
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* Place a call to /etc/lastlogin in your /etc/localprofile *
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* to be run on all user logins. *
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***************************************************************************/
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/***************************************************************************
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* Linux compiling instructions: *
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* *
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* $ gcc -o lastlogin lastlogin.c utmp2.o *
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* utmp2.o is compiled from poe-IGL (1.2) *
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* $ mv lastlogin /etc *
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* $ su *
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* Password: *
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* # chown adm /etc/lastlogin /usr/adm *
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* # chgrp adm /etc/lastlogin /usr/adm *
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* # chmod 4755 /etc/lastlogin *
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* *
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* Place a call to /etc/lastlogin in your /etc/profile *
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* to be run on all user logins. *
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* *
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* B.Bergt@informatik.tu-chemnitz.de *
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***************************************************************************/
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/* Print the last login time and record the new time */
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#include <stdio.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <string.h>
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#include <time.h>
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#include <utmp.h>
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#define LOGFILE "/usr/adm/lastlog"
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main()
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{
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struct utmp *utent, *getutent();
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int fd;
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long hrs, min, sec;
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struct lastlog {
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char ll_line[8];
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time_t ll_time;
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} ll;
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if (access(LOGFILE, 0) == -1) {
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if ((fd = creat(LOGFILE,0644)) == -1) {
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fprintf(stderr,"Cannot create file %s: ", LOGFILE);
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perror("creat()");
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exit(1);
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}
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} else {
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if ((fd = open(LOGFILE,O_RDWR)) == -1) {
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fprintf(stderr,"Cannot open file %s: ", LOGFILE);
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perror("open()");
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exit(1);
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}
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}
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if (lseek(fd, (long)(getuid()*sizeof(struct lastlog)), 0) == -1) {
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fprintf(stderr,"Cannot position file %s: ", LOGFILE);
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perror("lseek()");
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exit(1);
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}
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if (read(fd, (char *) &ll, sizeof ll) == sizeof ll &&
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ll.ll_time != 0L) {
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printf("Last login: %.*s on %.*s\n" , 19
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, (char *) ctime(&ll.ll_time) , sizeof(ll.ll_line)
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, ll.ll_line);
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} else printf("Last login: [No Login information on record]\n");
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sprintf(ll.ll_line, "%.8s", strrchr(ttyname(0), '/')+1);
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setutent();
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while ((utent = getutent()) != NULL)
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if (strcmp(utent->ut_line, ll.ll_line) == 0)
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break;
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if (utent == NULL) {
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fprintf(stderr,"Cannot locate utmp entry for tty\n");
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exit(1);
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}
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ll.ll_time = utent->ut_time;
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endutent();
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lseek(fd, (long)(getuid()*sizeof(struct lastlog)), 0);
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write(fd, (char *) &ll, sizeof ll);
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close(fd);
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exit(0);
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}
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