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377
study/linux-travel/MINIX-1.5/1.5/Source/commands/last.c
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377
study/linux-travel/MINIX-1.5/1.5/Source/commands/last.c
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/* last - display login history Author: Terrence W. Holm */
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/* last- Display the user log-in history.
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* Last(1) searches backwards through the file of log-in
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* records (/usr/adm/wtmp), displaying the length of
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* log-in sessions as requested by the options:
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*
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* Usage: last [-r] [-count] [-f file] [name] [tty] ...
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*
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* -r Search backwards only until the last reboot
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* record.
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*
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* -count Only print out <count> records. Last(1) stops
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* when either -r or -count is satisfied, or at
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* the end of the file if neither is given.
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*
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* -f file Use "file" instead of "/usr/adm/wtmp".
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*
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* name Print records for the user "name".
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*
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* tty Print records for the terminal "tty". Actually,
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* a list of names may be given and all records
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* that match either the user or tty name are
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* printed. If no names are given then all records
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* are displayed.
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*
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* A sigquit (^\) causes last(1) to display how far it
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* has gone back in the log-in record file, it then
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* continues. This is used to check on the progress of
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* long running searches. A sigint will stop last(1).
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*
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* Author: Terrence W. Holm May 1988
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*
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* Revision:
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* Fred van Kempen, October 1989
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* -Adapted to MSS.
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* -Adapted to new utmp database.
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*
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* Fred van Kempen, December 1989
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* -Adapted to POSIX (MINIX 1.5)
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*
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* Fred van Kempen, January 1990
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* -Final edit for 1.5
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*/
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#include <sys/types.h>
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#include <signal.h>
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#include <string.h>
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#include <utmp.h>
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#include <time.h>
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#include <stdlib.h>
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#include <stdio.h>
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#define FALSE 0
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#define TRUE 1
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#define BUFFER_SIZE 4096 /* Room for wtmp records */
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#define MAX_WTMP_COUNT ( BUFFER_SIZE / sizeof(struct utmp) )
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#define min( a, b ) ( (a < b) ? a : b )
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#define max( a, b ) ( (a > b) ? a : b )
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typedef struct logout { /* A logout time record */
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char line[12]; /* The terminal name */
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long time; /* The logout time */
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struct logout *next; /* Next in linked list */
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} logout;
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static char *Version = "@(#) LAST 1.6 (01/09/90)";
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/* command-line option flags */
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char boot_limit = FALSE; /* stop on latest reboot */
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char count_limit = FALSE; /* stop after print_count */
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int print_count;
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int arg_count; /* used to select specific */
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char **args; /* users and ttys */
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/* global variables */
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long boot_time = 0; /* Zero means no reboot yet */
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char *boot_down; /* "crash" or "down " flag */
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logout *first_link = NULL; /* List of logout times */
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int interrupt = FALSE; /* If sigint or sigquit occurs */
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/* Sigint() and Sigquit() Flag occurrence of an interrupt. */
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void Sigint(sig)
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int sig;
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{
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interrupt = SIGINT;
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}
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void Sigquit(sig)
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int sig;
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{
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interrupt = SIGQUIT;
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}
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void usage()
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{
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fprintf(stderr, "Usage: last [-r] [-count] [-f file] [name] [tty] ...\n");
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exit(-1);
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}
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/* A log-in record format file contains four types of records.
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*
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* [1] generated on a system reboot:
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*
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* line="~", name="reboot", host="", time=date()
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*
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*
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* [2] generated after a shutdown:
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*
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* line="~", name="shutdown", host="", time=date()
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*
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*
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* [3] generated on a successful login(1)
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*
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* line=ttyname(), name=cuserid(), host=, time=date()
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*
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*
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* [4] generated by init(8) on a logout
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*
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* line=ttyname(), name="", host="", time=date()
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*
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*
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* Note: This version of last(1) does not recognize the '|' and '}' time
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* change records. Last(1) pairs up line login's and logout's to
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* generate four types of output lines:
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*
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* [1] a system reboot or shutdown
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*
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* reboot ~ Mon May 16 14:16
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* shutdown ~ Mon May 16 14:15
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*
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* [2] a login with a matching logout
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*
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* edwin tty1 Thu May 26 20:05 - 20:32 (00:27)
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*
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* [3] a login followed by a reboot or shutdown
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*
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* root tty0 Mon May 16 13:57 - crash (00:19)
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* root tty1 Mon May 16 13:45 - down (00:30)
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*
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* [4] a login not followed by a logout or reboot
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*
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* terry tty0 Thu May 26 21:19 still logged in
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*/
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Process(wtmp)
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struct utmp *wtmp;
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{
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logout *link;
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logout *next_link;
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/* suppress the job number on an "ftp" line */
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if (!strncmp(wtmp->ut_line, "ftp", 3)) strncpy(wtmp->ut_line, "ftp", 8);
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if (!strcmp(wtmp->ut_line, "~")) {
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/* A reboot or shutdown record */
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if (boot_limit) exit(0);
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if (Print_Record(wtmp)) putchar('\n');
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boot_time = wtmp->ut_time;
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if (!strcmp(wtmp->ut_name, "reboot"))
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boot_down = "crash";
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else
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boot_down = "down ";
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/* remove any logout records */
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for (link = first_link; link != NULL; link = next_link) {
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next_link = link->next;
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free(link);
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}
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first_link = NULL;
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} else if (wtmp->ut_name[0] == '\0') {
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/* A logout record */
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Record_Logout_Time(wtmp);
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} else {
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/* A login record */
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for (link = first_link; link != NULL; link = link->next)
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if (!strncmp(link->line, wtmp->ut_line, 8)) {
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/* found corresponding logout record */
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if (Print_Record(wtmp)) {
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printf("- %.5s ", ctime(&link->time) + 11);
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Print_Duration(wtmp->ut_time, link->time);
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}
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/* record login time */
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link->time = wtmp->ut_time;
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return;
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}
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/* could not find a logout record for this login tty */
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if (Print_Record(wtmp))
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if (boot_time == 0) /* still on */
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printf(" still logged in\n");
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else { /* system crashed while on */
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printf("- %s ", boot_down);
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Print_Duration(wtmp->ut_time, boot_time);
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}
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Record_Logout_Time(wtmp); /* Needed in case of 2
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* consecutive logins */
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}
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}
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/* Print_Record(wtmp) If the record was requested, then print out
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* the user name, terminal, host and time.
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*/
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Print_Record(wtmp)
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struct utmp *wtmp;
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{
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int i;
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char print_flag = FALSE;
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/* check if we have already printed the requested number of records */
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if (count_limit && print_count == 0) exit(0);
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for (i = 0; i < arg_count; ++i)
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if (!strcmp(args[i], wtmp->ut_name) || !strcmp(args[i], wtmp->ut_line))
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print_flag = TRUE;
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if (arg_count == 0 || print_flag) {
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#ifdef RLOGIN
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printf("%-8.8s %-8.8s %-16.16s %.16s ",
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wtmp->ut_name, wtmp->ut_line, wtmp->ut_host,
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ctime(&wtmp->ut_time));
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#else
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printf("%-8.8s %-8.8s %.16s ",
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wtmp->ut_name, wtmp->ut_line, ctime(&wtmp->ut_time));
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#endif
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--print_count;
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return(TRUE);
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}
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return(FALSE);
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}
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/* Print_Duration(from, to) Calculate and print the days and hh:mm between
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* the log-in and the log-out.
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*/
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Print_Duration(from, to)
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long from;
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long to;
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{
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long delta, days, hours, minutes;
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delta = max(to - from, 0);
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days = delta / (24L * 60L * 60L);
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delta = delta % (24L * 60L * 60L);
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hours = delta / (60L * 60L);
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delta = delta % (60L * 60L);
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minutes = delta / 60L;
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if (days > 0)
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printf("(%ld+", days);
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else
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printf(" (");
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printf("%02ld:%02ld)\n", hours, minutes);
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}
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/* Record_Logout_Time(wtmp) A linked list of "last logout time" is kept.
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* Each element of the list is for one terminal.
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*/
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Record_Logout_Time(wtmp)
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struct utmp *wtmp;
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{
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logout *link;
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/* see if the terminal is already in the list */
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for (link = first_link; link != NULL; link = link->next)
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if (!strncmp(link->line, wtmp->ut_line, 8)) {
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link->time = wtmp->ut_time;
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return;
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}
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/* allocate a new logout record, for a tty not previously encountered */
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link = (logout *) malloc(sizeof(logout));
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if (link == (logout *) NULL) {
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fprintf(stderr, "last: malloc failure\n");
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exit(1);
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}
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strncpy(link->line, wtmp->ut_line, 8);
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link->time = wtmp->ut_time;
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link->next = first_link;
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first_link = link;
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}
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main(argc, argv)
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int argc;
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char *argv[];
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{
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char *wtmp_file = WTMP;
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FILE *f;
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long size; /* Number of wtmp records in the file */
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long now; /* time */
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int wtmp_count; /* How many to read into wtmp_buffer */
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struct utmp wtmp_buffer[MAX_WTMP_COUNT];
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--argc;
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++argv;
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while (argc > 0 && *argv[0] == '-') {
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if (!strcmp(argv[0], "-r"))
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boot_limit = TRUE;
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else if (argc > 1 && !strcmp(argv[0], "-f")) {
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wtmp_file = argv[1];
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--argc;
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++argv;
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} else if ((print_count = atoi(argv[0] + 1)) > 0)
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count_limit = TRUE;
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else
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usage();
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--argc;
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++argv;
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}
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arg_count = argc;
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args = argv;
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if ((f = fopen(wtmp_file, "r")) == (FILE *) NULL) {
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perror(wtmp_file);
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exit(1);
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}
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if (fseek(f, 0L, 2) != 0 || (size = ftell(f)) % sizeof(struct utmp) != 0) {
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fprintf(stderr, "last: invalid wtmp file\n");
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exit(1);
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}
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if (signal(SIGINT, SIG_IGN) != SIG_IGN) {
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signal(SIGINT, Sigint);
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signal(SIGQUIT, Sigquit);
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}
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size /= sizeof(struct utmp); /* Number of records in wtmp */
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if (size == 0) {
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now = time((time_t *)0);
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printf("\nwtmp begins %.16s \n", ctime(&now));
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exit(0);
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}
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while (size > 0) {
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wtmp_count = (int) min(size, MAX_WTMP_COUNT);
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size -= (long) wtmp_count;
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fseek(f, size * sizeof(struct utmp), 0);
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if (fread(&wtmp_buffer[0], sizeof(struct utmp), wtmp_count, f)
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!= wtmp_count) {
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fprintf(stderr, "last: read error on wtmp file\n");
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exit(1);
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}
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while (--wtmp_count >= 0) {
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Process(&wtmp_buffer[wtmp_count]);
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if (interrupt) {
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printf("\ninterrupted %.16s \n",
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ctime(&wtmp_buffer[wtmp_count].ut_time));
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if (interrupt == SIGINT) exit(2);
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interrupt = FALSE;
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signal(SIGQUIT, Sigquit);
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}
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}
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} /* end while(size > 0) */
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printf("\nwtmp begins %.16s \n", ctime(&wtmp_buffer[0].ut_time));
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exit(0);
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}
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