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e3b218cd7b
records with time==0 get "the time of the last valid record", while records where time goes backwards (compared to the previous record) are skipped. Also prints a message saying how many records were changed or skipped due to these checks. Check was inspired by a simpler check in OpenBSD's version. This is all meant to sidestep problems that Tillman Hodgson noticed with 'ac' when running sparc64 with 64-bit time_t's. The real problem is whatever is creating wtmp records with ut_time==0, of course, but I have not yet figured out what is doing that. Reviewed by: no screams from freebsd-sparc64 or bde MFC after: 2 weeks
669 lines
15 KiB
C
669 lines
15 KiB
C
/*
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* Copyright (c) 1994 Christopher G. Demetriou.
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* @(#)Copyright (c) 1994, Simon J. Gerraty.
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*
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* This is free software. It comes with NO WARRANTY.
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* Permission to use, modify and distribute this source code
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* is granted subject to the following conditions.
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* 1/ that the above copyright notice and this notice
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* are preserved in all copies and that due credit be given
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* to the author.
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* 2/ that any changes to this code are clearly commented
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* as such so that the author does not get blamed for bugs
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* other than his own.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/time.h>
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#include <err.h>
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#include <errno.h>
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#include <langinfo.h>
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#include <locale.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <timeconv.h>
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#include <unistd.h>
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#include <utmp.h>
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/*
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* this is for our list of currently logged in sessions
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*/
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struct utmp_list {
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struct utmp_list *next;
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struct utmp usr;
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};
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/*
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* this is for our list of users that are accumulating time.
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*/
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struct user_list {
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struct user_list *next;
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char name[UT_NAMESIZE+1];
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time_t secs;
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};
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/*
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* this is for chosing whether to ignore a login
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*/
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struct tty_list {
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struct tty_list *next;
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char name[UT_LINESIZE+3];
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size_t len;
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int ret;
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};
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/*
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* globals - yes yuk
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*/
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#ifdef CONSOLE_TTY
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static char *Console = CONSOLE_TTY;
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#endif
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static time_t Total = 0;
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static time_t FirstTime = 0;
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static int Flags = 0;
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static struct user_list *Users = NULL;
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static struct tty_list *Ttys = NULL;
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#define NEW(type) (type *)malloc(sizeof (type))
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#define AC_W 1 /* not _PATH_WTMP */
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#define AC_D 2 /* daily totals (ignore -p) */
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#define AC_P 4 /* per-user totals */
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#define AC_U 8 /* specified users only */
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#define AC_T 16 /* specified ttys only */
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#ifdef DEBUG
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static int Debug = 0;
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#endif
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int main(int, char **);
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int ac(FILE *);
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struct tty_list *add_tty(char *);
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#ifdef DEBUG
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const char *debug_pfx(const struct utmp *, const struct utmp *);
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#endif
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int do_tty(char *);
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FILE *file(const char *);
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struct utmp_list *log_in(struct utmp_list *, struct utmp *);
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struct utmp_list *log_out(struct utmp_list *, struct utmp *);
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int on_console(struct utmp_list *);
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void show(const char *, time_t);
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void show_today(struct user_list *, struct utmp_list *,
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time_t);
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void show_users(struct user_list *);
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struct user_list *update_user(struct user_list *, char *, time_t);
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void usage(void);
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/*
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* open wtmp or die
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*/
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FILE *
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file(const char *name)
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{
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FILE *fp;
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if ((fp = fopen(name, "r")) == NULL)
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err(1, "%s", name);
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/* in case we want to discriminate */
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if (strcmp(_PATH_WTMP, name))
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Flags |= AC_W;
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return fp;
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}
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struct tty_list *
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add_tty(char *name)
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{
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struct tty_list *tp;
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char *rcp;
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Flags |= AC_T;
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if ((tp = NEW(struct tty_list)) == NULL)
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errx(1, "malloc failed");
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tp->len = 0; /* full match */
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tp->ret = 1; /* do if match */
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if (*name == '!') { /* don't do if match */
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tp->ret = 0;
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name++;
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}
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strlcpy(tp->name, name, sizeof (tp->name));
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if ((rcp = strchr(tp->name, '*')) != NULL) { /* wild card */
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*rcp = '\0';
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tp->len = strlen(tp->name); /* match len bytes only */
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}
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tp->next = Ttys;
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Ttys = tp;
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return Ttys;
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}
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/*
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* should we process the named tty?
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*/
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int
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do_tty(char *name)
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{
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struct tty_list *tp;
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int def_ret = 0;
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for (tp = Ttys; tp != NULL; tp = tp->next) {
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if (tp->ret == 0) /* specific don't */
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def_ret = 1; /* default do */
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if (tp->len != 0) {
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if (strncmp(name, tp->name, tp->len) == 0)
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return tp->ret;
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} else {
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if (strncmp(name, tp->name, sizeof (tp->name)) == 0)
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return tp->ret;
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}
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}
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return def_ret;
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}
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#ifdef CONSOLE_TTY
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/*
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* is someone logged in on Console?
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*/
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int
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on_console(struct utmp_list *head)
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{
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struct utmp_list *up;
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for (up = head; up; up = up->next) {
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if (strncmp(up->usr.ut_line, Console,
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sizeof (up->usr.ut_line)) == 0)
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return 1;
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}
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return 0;
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}
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#endif
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/*
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* update user's login time
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*/
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struct user_list *
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update_user(struct user_list *head, char *name, time_t secs)
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{
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struct user_list *up;
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for (up = head; up != NULL; up = up->next) {
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if (strncmp(up->name, name, UT_NAMESIZE) == 0) {
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up->secs += secs;
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Total += secs;
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return head;
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}
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}
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/*
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* not found so add new user unless specified users only
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*/
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if (Flags & AC_U)
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return head;
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if ((up = NEW(struct user_list)) == NULL)
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errx(1, "malloc failed");
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up->next = head;
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strlcpy(up->name, name, sizeof (up->name));
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up->secs = secs;
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Total += secs;
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return up;
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}
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#ifdef DEBUG
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/*
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* Create a string which is the standard prefix for a debug line. It
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* includes a timestamp (perhaps with year), device-name, and user-name.
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*/
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const char *
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debug_pfx(const struct utmp *event_up, const struct utmp *userinf_up)
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{
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static char str_result[40+UT_LINESIZE+UT_NAMESIZE];
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static char thisyear[5];
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size_t maxcopy;
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time_t ut_timecopy;
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if (thisyear[0] == '\0') {
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/* Figure out what "this year" is. */
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time(&ut_timecopy);
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strlcpy(str_result, ctime(&ut_timecopy), sizeof(str_result));
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strlcpy(thisyear, &str_result[20], sizeof(thisyear));
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}
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if (event_up->ut_time == 0)
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strlcpy(str_result, "*ZeroTime* --:--:-- ", sizeof(str_result));
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else {
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/*
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* The type of utmp.ut_time is not necessary type time_t, as
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* it is explicitly defined as type int32_t. Copy the value
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* for platforms where sizeof(time_t) != sizeof(int32_t).
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*/
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ut_timecopy = _time32_to_time(event_up->ut_time);
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strlcpy(str_result, ctime(&ut_timecopy), sizeof(str_result));
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/*
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* Include the year, if it is not the same year as "now".
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*/
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if (strncmp(&str_result[20], thisyear, 4) == 0)
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str_result[20] = '\0';
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else {
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str_result[24] = ' '; /* Replace a '\n' */
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str_result[25] = '\0';
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}
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}
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if (userinf_up->ut_line[0] == '\0')
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strlcat(str_result, "NoDev", sizeof(str_result));
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else {
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/* ut_line is not necessarily null-terminated. */
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maxcopy = strlen(str_result) + UT_LINESIZE + 1;
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if (maxcopy > sizeof(str_result))
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maxcopy = sizeof(str_result);
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strlcat(str_result, userinf_up->ut_line, maxcopy);
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}
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strlcat(str_result, ": ", sizeof(str_result));
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if (userinf_up->ut_name[0] == '\0')
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strlcat(str_result, "LogOff", sizeof(str_result));
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else {
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/* ut_name is not necessarily null-terminated. */
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maxcopy = strlen(str_result) + UT_NAMESIZE + 1;
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if (maxcopy > sizeof(str_result))
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maxcopy = sizeof(str_result);
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strlcat(str_result, userinf_up->ut_name, maxcopy);
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}
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return (str_result);
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}
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#endif
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int
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main(int argc, char *argv[])
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{
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FILE *fp;
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int c;
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(void) setlocale(LC_TIME, "");
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fp = NULL;
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while ((c = getopt(argc, argv, "Dc:dpt:w:")) != -1) {
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switch (c) {
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#ifdef DEBUG
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case 'D':
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Debug++;
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break;
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#endif
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case 'c':
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#ifdef CONSOLE_TTY
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Console = optarg;
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#else
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usage(); /* XXX */
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#endif
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break;
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case 'd':
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Flags |= AC_D;
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break;
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case 'p':
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Flags |= AC_P;
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break;
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case 't': /* only do specified ttys */
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add_tty(optarg);
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break;
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case 'w':
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fp = file(optarg);
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break;
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case '?':
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default:
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usage();
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break;
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}
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}
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if (optind < argc) {
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/*
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* initialize user list
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*/
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for (; optind < argc; optind++) {
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Users = update_user(Users, argv[optind], (time_t)0);
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}
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Flags |= AC_U; /* freeze user list */
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}
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if (Flags & AC_D)
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Flags &= ~AC_P;
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if (fp == NULL) {
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/*
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* if _PATH_WTMP does not exist, exit quietly
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*/
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if (access(_PATH_WTMP, 0) != 0 && errno == ENOENT)
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return 0;
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fp = file(_PATH_WTMP);
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}
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ac(fp);
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return 0;
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}
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/*
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* print login time in decimal hours
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*/
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void
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show(const char *name, time_t secs)
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{
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(void)printf("\t%-*s %8.2f\n", UT_NAMESIZE, name,
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((double)secs / 3600));
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}
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void
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show_users(struct user_list *list)
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{
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struct user_list *lp;
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for (lp = list; lp; lp = lp->next)
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show(lp->name, lp->secs);
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}
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/*
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* print total login time for 24hr period in decimal hours
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*/
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void
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show_today(struct user_list *users, struct utmp_list *logins, time_t secs)
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{
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struct user_list *up;
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struct utmp_list *lp;
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char date[64];
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time_t yesterday = secs - 1;
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static int d_first = -1;
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if (d_first < 0)
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d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
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(void)strftime(date, sizeof (date),
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d_first ? "%e %b total" : "%b %e total",
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localtime(&yesterday));
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/* restore the missing second */
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yesterday++;
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for (lp = logins; lp != NULL; lp = lp->next) {
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secs = yesterday - lp->usr.ut_time;
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Users = update_user(Users, lp->usr.ut_name, secs);
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lp->usr.ut_time = yesterday; /* as if they just logged in */
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}
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secs = 0;
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for (up = users; up != NULL; up = up->next) {
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secs += up->secs;
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up->secs = 0; /* for next day */
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}
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if (secs)
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(void)printf("%s %11.2f\n", date, ((double)secs / 3600));
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}
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/*
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* log a user out and update their times.
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* if ut_line is "~", we log all users out as the system has
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* been shut down.
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*/
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struct utmp_list *
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log_out(struct utmp_list *head, struct utmp *up)
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{
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struct utmp_list *lp, *lp2, *tlp;
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time_t secs;
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for (lp = head, lp2 = NULL; lp != NULL; )
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if (*up->ut_line == '~' || strncmp(lp->usr.ut_line, up->ut_line,
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sizeof (up->ut_line)) == 0) {
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secs = up->ut_time - lp->usr.ut_time;
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Users = update_user(Users, lp->usr.ut_name, secs);
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#ifdef DEBUG
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if (Debug)
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printf("%s logged out (%2d:%02d:%02d)\n",
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debug_pfx(up, &lp->usr), (int)(secs / 3600),
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(int)((secs % 3600) / 60),
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(int)(secs % 60));
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#endif
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/*
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* now lose it
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*/
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tlp = lp;
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lp = lp->next;
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if (tlp == head)
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head = lp;
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else if (lp2 != NULL)
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lp2->next = lp;
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free(tlp);
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} else {
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lp2 = lp;
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lp = lp->next;
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}
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return head;
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}
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/*
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* if do_tty says ok, login a user
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*/
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struct utmp_list *
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log_in(struct utmp_list *head, struct utmp *up)
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{
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struct utmp_list *lp;
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/*
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* this could be a login. if we're not dealing with
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* the console name, say it is.
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*
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* If we are, and if ut_host==":0.0" we know that it
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* isn't a real login. _But_ if we have not yet recorded
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* someone being logged in on Console - due to the wtmp
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* file starting after they logged in, we'll pretend they
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* logged in, at the start of the wtmp file.
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*/
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#ifdef CONSOLE_TTY
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if (up->ut_host[0] == ':') {
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/*
|
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* SunOS 4.0.2 does not treat ":0.0" as special but we
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* do.
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*/
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if (on_console(head))
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return head;
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/*
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* ok, no recorded login, so they were here when wtmp
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* started! Adjust ut_time!
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*/
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up->ut_time = FirstTime;
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/*
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* this allows us to pick the right logout
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*/
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strlcpy(up->ut_line, Console, sizeof (up->ut_line));
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}
|
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#endif
|
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/*
|
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* If we are doing specified ttys only, we ignore
|
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* anything else.
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*/
|
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if (Flags & AC_T)
|
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if (!do_tty(up->ut_line))
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return head;
|
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|
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/*
|
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* go ahead and log them in
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*/
|
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if ((lp = NEW(struct utmp_list)) == NULL)
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errx(1, "malloc failed");
|
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lp->next = head;
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head = lp;
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memmove((char *)&lp->usr, (char *)up, sizeof (struct utmp));
|
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#ifdef DEBUG
|
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if (Debug) {
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printf("%s logged in", debug_pfx(&lp->usr, up));
|
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if (*up->ut_host)
|
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printf(" (%-.*s)", (int)sizeof(up->ut_host),
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up->ut_host);
|
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putchar('\n');
|
|
}
|
|
#endif
|
|
return head;
|
|
}
|
|
|
|
int
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ac(FILE *fp)
|
|
{
|
|
struct utmp_list *lp, *head = NULL;
|
|
struct utmp usr;
|
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struct tm *ltm;
|
|
time_t prev_secs, secs, ut_timecopy;
|
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int day, rfound, tchanged, tskipped;
|
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|
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day = -1;
|
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prev_secs = 1; /* Minimum acceptable date == 1970 */
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rfound = tchanged = tskipped = 0;
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secs = 0;
|
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while (fread((char *)&usr, sizeof(usr), 1, fp) == 1) {
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rfound++;
|
|
/*
|
|
* The type of utmp.ut_time is not necessary type time_t, as
|
|
* it is explicitly defined as type int32_t. Copy the value
|
|
* for platforms where sizeof(time_t) != size(int32_t).
|
|
*/
|
|
ut_timecopy = _time32_to_time(usr.ut_time);
|
|
/*
|
|
* With sparc64 using 64-bit time_t's, there is some system
|
|
* routine which sets ut_time==0 (the high-order word of a
|
|
* 64-bit time) instead of a 32-bit time value. For those
|
|
* wtmp files, it is "more-accurate" to substitute the most-
|
|
* recent time found, instead of throwing away the entire
|
|
* record. While it is still just a guess, it is a better
|
|
* guess than throwing away a log-off record and therefore
|
|
* counting a session as if it continued to the end of the
|
|
* month, or the next system-reboot.
|
|
*/
|
|
if (ut_timecopy == 0 && prev_secs > 1) {
|
|
#ifdef DEBUG
|
|
if (Debug)
|
|
printf("%s - date changed to: %s",
|
|
debug_pfx(&usr, &usr), ctime(&prev_secs));
|
|
#endif
|
|
tchanged++;
|
|
usr.ut_time = ut_timecopy = prev_secs;
|
|
}
|
|
/*
|
|
* Skip records where the time goes backwards.
|
|
*/
|
|
if (ut_timecopy < prev_secs) {
|
|
#ifdef DEBUG
|
|
if (Debug)
|
|
printf("%s - bad date, record skipped\n",
|
|
debug_pfx(&usr, &usr));
|
|
#endif
|
|
tskipped++;
|
|
continue; /* Skip this invalid record. */
|
|
}
|
|
prev_secs = ut_timecopy;
|
|
|
|
if (!FirstTime)
|
|
FirstTime = ut_timecopy;
|
|
if (Flags & AC_D) {
|
|
ltm = localtime(&ut_timecopy);
|
|
if (day >= 0 && day != ltm->tm_yday) {
|
|
day = ltm->tm_yday;
|
|
/*
|
|
* print yesterday's total
|
|
*/
|
|
secs = ut_timecopy;
|
|
secs -= ltm->tm_sec;
|
|
secs -= 60 * ltm->tm_min;
|
|
secs -= 3600 * ltm->tm_hour;
|
|
show_today(Users, head, secs);
|
|
} else
|
|
day = ltm->tm_yday;
|
|
}
|
|
switch(*usr.ut_line) {
|
|
case '|':
|
|
secs = ut_timecopy;
|
|
break;
|
|
case '{':
|
|
secs -= ut_timecopy;
|
|
/*
|
|
* adjust time for those logged in
|
|
*/
|
|
for (lp = head; lp != NULL; lp = lp->next)
|
|
lp->usr.ut_time -= secs;
|
|
break;
|
|
case '~': /* reboot or shutdown */
|
|
head = log_out(head, &usr);
|
|
FirstTime = ut_timecopy; /* shouldn't be needed */
|
|
break;
|
|
default:
|
|
/*
|
|
* if they came in on tty[p-sP-S]*, then it is only
|
|
* a login session if the ut_host field is non-empty
|
|
*/
|
|
if (*usr.ut_name) {
|
|
if (strncmp(usr.ut_line, "tty", 3) == 0 ||
|
|
strchr("pqrsPQRS", usr.ut_line[3]) != 0 ||
|
|
*usr.ut_host != '\0')
|
|
head = log_in(head, &usr);
|
|
#ifdef DEBUG
|
|
else if (Debug > 1)
|
|
/* Things such as 'screen' sessions. */
|
|
printf("%s - record ignored\n",
|
|
debug_pfx(&usr, &usr));
|
|
#endif
|
|
} else
|
|
head = log_out(head, &usr);
|
|
break;
|
|
}
|
|
}
|
|
(void)fclose(fp);
|
|
if (!(Flags & AC_W))
|
|
usr.ut_time = time((time_t *)0);
|
|
(void)strcpy(usr.ut_line, "~");
|
|
|
|
if (Flags & AC_D) {
|
|
ut_timecopy = _time32_to_time(usr.ut_time);
|
|
ltm = localtime(&ut_timecopy);
|
|
if (day >= 0 && day != ltm->tm_yday) {
|
|
/*
|
|
* print yesterday's total
|
|
*/
|
|
secs = ut_timecopy;
|
|
secs -= ltm->tm_sec;
|
|
secs -= 60 * ltm->tm_min;
|
|
secs -= 3600 * ltm->tm_hour;
|
|
show_today(Users, head, secs);
|
|
}
|
|
}
|
|
/*
|
|
* anyone still logged in gets time up to now
|
|
*/
|
|
head = log_out(head, &usr);
|
|
|
|
if (Flags & AC_D)
|
|
show_today(Users, head, time((time_t *)0));
|
|
else {
|
|
if (Flags & AC_P)
|
|
show_users(Users);
|
|
show("total", Total);
|
|
}
|
|
|
|
if (tskipped > 0)
|
|
printf("(Skipped %d of %d records due to invalid time values)\n",
|
|
tskipped, rfound);
|
|
if (tchanged > 0)
|
|
printf("(Changed %d of %d records to have a more likely time value)\n",
|
|
tchanged, rfound);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
usage(void)
|
|
{
|
|
(void)fprintf(stderr,
|
|
#ifdef CONSOLE_TTY
|
|
"ac [-dp] [-c console] [-t tty] [-w wtmp] [users ...]\n");
|
|
#else
|
|
"ac [-dp] [-t tty] [-w wtmp] [users ...]\n");
|
|
#endif
|
|
exit(1);
|
|
}
|