/* * Copyright (c) 1987, 1993, 1994 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD$ */ #ifndef lint static const char copyright[] = "@(#) Copyright (c) 1987, 1993, 1994\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint static const char sccsid[] = "@(#)last.c 8.2 (Berkeley) 4/2/94"; #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define NO 0 /* false/no */ #define YES 1 /* true/yes */ #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; static struct utmp buf[1024]; /* utmp read buffer */ typedef struct arg { char *name; /* argument */ #define HOST_TYPE -2 #define TTY_TYPE -3 #define USER_TYPE -4 int type; /* type of arg */ struct arg *next; /* linked list pointer */ } ARG; ARG *arglist; /* head of linked list */ LIST_HEAD(ttylisthead, ttytab) ttylist; struct ttytab { time_t logout; /* log out time */ char tty[UT_LINESIZE + 1]; /* terminal name */ LIST_ENTRY(ttytab) list; }; static const char *crmsg; /* cause of last reboot */ static long currentout, /* current logout value */ maxrec; /* records to display */ static const char *file = _PATH_WTMP; /* wtmp file */ static int sflag = 0; /* show delta in seconds */ static int width = 5; /* show seconds in delta */ static int yflag; /* show year */ static int d_first; static int snapfound = 0; /* found snapshot entry? */ static time_t snaptime; /* if != 0, we will only * report users logged in * at this snapshot time */ void addarg __P((int, char *)); time_t dateconv __P((char *)); void doentry __P((struct utmp *)); void hostconv __P((char *)); void onintr __P((int)); void printentry __P((struct utmp *, struct ttytab *)); char *ttyconv __P((char *)); int want __P((struct utmp *)); void usage __P((void)); void wtmp __P((void)); void usage(void) { (void)fprintf(stderr, "usage: last [-#] [-y] [-d [[CC]YY][MMDD]hhmm[.SS]] [-f file] [-h host]\n" "\t[-t tty] [-s|w] [user ...]\n"); exit(1); } int main(argc, argv) int argc; char *argv[]; { int ch; char *p; (void) setlocale(LC_TIME, ""); d_first = (*nl_langinfo(D_MD_ORDER) == 'd'); maxrec = -1; snaptime = 0; while ((ch = getopt(argc, argv, "0123456789d:f:h:st:wy")) != -1) switch (ch) { case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': /* * kludge: last was originally designed to take * a number after a dash. */ if (maxrec == -1) { p = argv[optind - 1]; if (p[0] == '-' && p[1] == ch && !p[2]) maxrec = atol(++p); else maxrec = atol(argv[optind] + 1); if (!maxrec) exit(0); } break; case 'd': snaptime = dateconv(optarg); break; case 'f': file = optarg; break; case 'h': hostconv(optarg); addarg(HOST_TYPE, optarg); break; case 's': sflag++; /* Show delta as seconds */ break; case 't': addarg(TTY_TYPE, ttyconv(optarg)); break; case 'w': width = 8; break; case 'y': yflag++; break; case '?': default: usage(); } if (sflag && width == 8) usage(); if (argc) { setlinebuf(stdout); for (argv += optind; *argv; ++argv) { #define COMPATIBILITY #ifdef COMPATIBILITY /* code to allow "last p5" to work */ addarg(TTY_TYPE, ttyconv(*argv)); #endif addarg(USER_TYPE, *argv); } } wtmp(); exit(0); } /* * wtmp -- * read through the wtmp file */ void wtmp() { struct utmp *bp; /* current structure */ struct stat stb; /* stat of file for size */ long bl; int bytes, wfd; char ct[80]; struct tm *tm; time_t t; LIST_INIT(&ttylist); if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1) err(1, "%s", file); bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf); (void)time(&t); buf[0].ut_time = _time_to_int(t); (void)signal(SIGINT, onintr); (void)signal(SIGQUIT, onintr); while (--bl >= 0) { if (lseek(wfd, (off_t)(bl * sizeof(buf)), L_SET) == -1 || (bytes = read(wfd, buf, sizeof(buf))) == -1) err(1, "%s", file); for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) doentry(bp); } t = _int_to_time(buf[0].ut_time); tm = localtime(&t); (void) strftime(ct, sizeof(ct), "\nwtmp begins %+\n", tm); printf("%s", ct); } /* * doentry -- * process a single wtmp entry */ void doentry(bp) struct utmp *bp; { struct ttytab *tt, *ttx; /* ttylist entry */ /* * if the terminal line is '~', the machine stopped. * see utmp(5) for more info. */ if (bp->ut_line[0] == '~' && !bp->ut_line[1]) { /* everybody just logged out */ for (tt = LIST_FIRST(&ttylist); tt;) { LIST_REMOVE(tt, list); ttx = tt; tt = LIST_NEXT(tt, list); free(ttx); } currentout = -bp->ut_time; crmsg = strncmp(bp->ut_name, "shutdown", UT_NAMESIZE) ? "crash" : "shutdown"; /* * if we're in snapshot mode, we want to exit if this * shutdown/reboot appears while we we are tracking the * active range */ if (snaptime && snapfound) exit(0); /* * don't print shutdown/reboot entries unless flagged for */ if (!snaptime && want(bp)) printentry(bp, NULL); return; } /* * if the line is '{' or '|', date got set; see * utmp(5) for more info. */ if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|') && !bp->ut_line[1]) { if (want(bp) && !snaptime) printentry(bp, NULL); return; } /* find associated tty */ LIST_FOREACH(tt, &ttylist, list) if (!strncmp(tt->tty, bp->ut_line, UT_LINESIZE)) break; if (tt == NULL) { /* add new one */ tt = malloc(sizeof(struct ttytab)); if (tt == NULL) err(1, "malloc failure"); tt->logout = currentout; strncpy(tt->tty, bp->ut_line, UT_LINESIZE); LIST_INSERT_HEAD(&ttylist, tt, list); } /* * print record if not in snapshot mode and wanted * or in snapshot mode and in snapshot range */ if (bp->ut_name[0] && (want(bp) || (bp->ut_time < snaptime && (tt->logout > snaptime || tt->logout < 1)))) { snapfound = 1; /* * 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", sizeof("ftp") - 1)) bp->ut_line[3] = '\0'; else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) bp->ut_line[4] = '\0'; printentry(bp, tt); } tt->logout = bp->ut_time; } /* * printentry -- * output an entry * * If `tt' is non-NULL, use it and `crmsg' to print the logout time or * logout type (crash/shutdown) as appropriate. */ void printentry(bp, tt) struct utmp *bp; struct ttytab *tt; { char ct[80]; struct tm *tm; time_t delta; /* time difference */ time_t t; if (maxrec != -1 && !maxrec--) exit(0); t = _int_to_time(bp->ut_time); tm = localtime(&t); (void) strftime(ct, sizeof(ct), d_first ? (yflag ? "%a %e %b %Y %R" : "%a %e %b %R") : (yflag ? "%a %b %e %Y %R" : "%a %b %e %R"), tm); printf("%-*.*s %-*.*s %-*.*s %s%c", UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, UT_LINESIZE, UT_LINESIZE, bp->ut_line, UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, ct, tt == NULL ? '\n' : ' '); if (tt == NULL) return; if (!tt->logout) { puts(" still logged in"); return; } if (tt->logout < 0) { tt->logout = -tt->logout; printf("- %s", crmsg); } else { tm = localtime(&tt->logout); (void) strftime(ct, sizeof(ct), "%R", tm); printf("- %s", ct); } delta = tt->logout - bp->ut_time; if (sflag) { printf(" (%8ld)\n", (long)delta); } else { tm = gmtime(&delta); (void) strftime(ct, sizeof(ct), width >= 8 ? "%T" : "%R", tm); if (delta < 86400) printf(" (%s)\n", ct); else printf(" (%ld+%s)\n", (long)delta / 86400, ct); } } /* * want -- * see if want this entry */ int want(bp) struct utmp *bp; { ARG *step; if (snaptime) return (NO); if (!arglist) return (YES); for (step = arglist; step; step = step->next) switch(step->type) { case HOST_TYPE: if (!strncasecmp(step->name, bp->ut_host, UT_HOSTSIZE)) return (YES); break; case TTY_TYPE: if (!strncmp(step->name, bp->ut_line, UT_LINESIZE)) return (YES); break; case USER_TYPE: if (!strncmp(step->name, bp->ut_name, UT_NAMESIZE)) return (YES); break; } return (NO); } /* * addarg -- * add an entry to a linked list of arguments */ void addarg(type, arg) int type; char *arg; { ARG *cur; if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) err(1, "malloc failure"); cur->next = arglist; cur->type = type; cur->name = arg; arglist = cur; } /* * hostconv -- * convert the hostname to search pattern; if the supplied host name * has a domain attached that is the same as the current domain, rip * off the domain suffix since that's what login(1) does. */ void hostconv(arg) char *arg; { static int first = 1; static char *hostdot, name[MAXHOSTNAMELEN]; char *argdot; if (!(argdot = strchr(arg, '.'))) return; if (first) { first = 0; if (gethostname(name, sizeof(name))) err(1, "gethostname"); hostdot = strchr(name, '.'); } if (hostdot && !strcasecmp(hostdot, argdot)) *argdot = '\0'; } /* * ttyconv -- * convert tty to correct name. */ char * ttyconv(arg) char *arg; { char *mval; /* * kludge -- we assume that all tty's end with * a two character suffix. */ if (strlen(arg) == 2) { /* either 6 for "ttyxx" or 8 for "console" */ if (!(mval = malloc((u_int)8))) err(1, "malloc failure"); if (!strcmp(arg, "co")) (void)strcpy(mval, "console"); else { (void)strcpy(mval, "tty"); (void)strcpy(mval + 3, arg); } return (mval); } if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) return (arg + 5); return (arg); } /* * dateconv -- * Convert the snapshot time in command line given in the format * [[CC]YY]MMDDhhmm[.SS]] to a time_t. * Derived from atime_arg1() in usr.bin/touch/touch.c */ time_t dateconv(arg) char *arg; { time_t timet; struct tm *t; int yearset; char *p; /* Start with the current time. */ if (time(&timet) < 0) err(1, "time"); if ((t = localtime(&timet)) == NULL) err(1, "localtime"); /* [[CC]YY]MMDDhhmm[.SS] */ if ((p = strchr(arg, '.')) == NULL) t->tm_sec = 0; /* Seconds defaults to 0. */ else { if (strlen(p + 1) != 2) goto terr; *p++ = '\0'; t->tm_sec = ATOI2(p); } yearset = 0; switch (strlen(arg)) { case 12: /* CCYYMMDDhhmm */ t->tm_year = ATOI2(arg); t->tm_year *= 100; yearset = 1; /* FALLTHOUGH */ case 10: /* YYMMDDhhmm */ if (yearset) { yearset = ATOI2(arg); t->tm_year += yearset; } else { yearset = ATOI2(arg); if (yearset < 69) t->tm_year = yearset + 2000; else t->tm_year = yearset + 1900; } t->tm_year -= 1900; /* Convert to UNIX time. */ /* FALLTHROUGH */ case 8: /* MMDDhhmm */ t->tm_mon = ATOI2(arg); --t->tm_mon; /* Convert from 01-12 to 00-11 */ t->tm_mday = ATOI2(arg); t->tm_hour = ATOI2(arg); t->tm_min = ATOI2(arg); break; case 4: /* hhmm */ t->tm_hour = ATOI2(arg); t->tm_min = ATOI2(arg); break; default: goto terr; } t->tm_isdst = -1; /* Figure out DST. */ timet = mktime(t); if (timet == -1) terr: errx(1, "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); return timet; } /* * onintr -- * on interrupt, we inform the user how far we've gotten */ void onintr(signo) int signo; { char ct[80]; struct tm *tm; time_t t = _int_to_time(buf[0].ut_time); tm = localtime(&t); (void) strftime(ct, sizeof(ct), d_first ? "%a %e %b %R" : "%a %b %e %R", tm); printf("\ninterrupted %s\n", ct); if (signo == SIGINT) exit(1); (void)fflush(stdout); /* fix required for rsh */ }