/* $OpenBSD: last.c,v 1.33 2005/11/14 15:38:05 deraadt Exp $ */ /* $NetBSD: last.c,v 1.6 1994/12/24 16:49:02 cgd Exp $ */ /* * 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. 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. */ #ifndef lint static char copyright[] = "@(#) Copyright (c) 1987, 1993, 1994\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint #if 0 static char sccsid[] = "@(#)last.c 8.2 (Berkeley) 4/2/94"; #endif static char rcsid[] = "$OpenBSD: last.c,v 1.33 2005/11/14 15:38:05 deraadt Exp $"; #endif /* not lint */ #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 */ 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 */ } *arglist; struct ttytab { time_t logout; /* log out time */ char tty[UT_LINESIZE + 1]; /* terminal name */ struct ttytab*next; /* linked list pointer */ } *ttylist; static time_t currentout; /* current logout value */ static long maxrec = -1; /* records to display */ static char *file = _PATH_WTMP; /* wtmp file */ static int fulltime = 0; /* Display seconds? */ static time_t snaptime = 0; /* report only at this time */ static int calculate = 0; static int seconds = 0; void addarg(int, char *); struct ttytab *addtty(char *); void hostconv(char *); void onintr(int); char *ttyconv(char *); time_t dateconv(char *); int want(struct utmp *, int); void wtmp(void); void checkargs(void); void usage(void); #define NAME_WIDTH 9 #define HOST_WIDTH 24 int main(int argc, char *argv[]) { const char *errstr; int ch, lastch = '\0', newarg = 1, prevoptind = 1; while ((ch = getopt(argc, argv, "0123456789cf:h:n:st:d:T")) != -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 (newarg || !isdigit(lastch)) maxrec = 0; else if (maxrec > INT_MAX / 10) usage(); maxrec = (maxrec * 10) + (ch - '0'); break; case 'c': calculate++; break; case 'f': file = optarg; break; case 'h': hostconv(optarg); addarg(HOST_TYPE, optarg); break; case 'n': maxrec = strtonum(optarg, 0, LONG_MAX, &errstr); if (errstr != NULL) errx(1, "number of lines is %s: %s", errstr, optarg); if (maxrec == 0) exit(0); break; case 's': seconds++; break; case 't': addarg(TTY_TYPE, ttyconv(optarg)); break; case 'd': snaptime = dateconv(optarg); break; case 'T': fulltime = 1; break; default: usage(); } lastch = ch; newarg = optind != prevoptind; prevoptind = optind; } if (maxrec == 0) exit(0); 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); } } checkargs(); wtmp(); exit(0); } /* * if snaptime is set, print warning if usernames, or -t or -h * flags are also provided */ void checkargs(void) { int ttyflag = 0; struct arg *step; if (!snaptime || !arglist) return; for (step = arglist; step; step = step->next) switch (step->type) { case HOST_TYPE: (void)fprintf(stderr, "Warning: Ignoring hostname flag\n"); break; case TTY_TYPE: if (!ttyflag) { /* don't print this twice */ (void)fprintf(stderr, "Warning: Ignoring tty flag\n"); ttyflag = 1; } break; case USER_TYPE: (void)fprintf(stderr, "Warning: Ignoring username[s]\n"); break; default: break; /* PRINT NOTHING */ } } /* * read through the wtmp file */ void wtmp(void) { time_t delta, total = 0; int timesize, wfd, snapfound = 0; char *ct, *crmsg, tim[40]; struct utmp *bp; struct stat stb; ssize_t bytes; off_t bl; struct ttytab *T; 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); if (fulltime) timesize = 8; /* HH:MM:SS */ else timesize = 5; /* HH:MM */ (void)time(&buf[0].ut_time); (void)signal(SIGINT, onintr); (void)signal(SIGQUIT, onintr); while (--bl >= 0) { if (lseek(wfd, bl * sizeof(buf), SEEK_SET) == -1 || (bytes = read(wfd, buf, sizeof(buf))) == -1) err(1, "%s", file); for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) { /* * 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 (T = ttylist; T; T = T->next) T->logout = -bp->ut_time; 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) { close(wfd); return; } /* * don't print shutdown/reboot entries * unless flagged for */ if (want(bp, NO)) { if (seconds) { snprintf(tim, sizeof tim, "%ld", (long)bp->ut_time); } else { ct = ctime(&bp->ut_time); snprintf(tim, sizeof tim, "%10.10s %*.*s", ct, timesize, timesize, ct + 11); } printf("%-*.*s %-*.*s %-*.*s %s \n", NAME_WIDTH, UT_NAMESIZE, bp->ut_name, UT_LINESIZE, UT_LINESIZE, bp->ut_line, HOST_WIDTH, UT_HOSTSIZE, bp->ut_host, tim); if (maxrec != -1 && !--maxrec) { close(wfd); return; } } continue; } /* * 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, NO)) { if (seconds) { snprintf(tim, sizeof tim, "%ld", (long)bp->ut_time); } else { ct = ctime(&bp->ut_time); snprintf(tim, sizeof tim, "%10.10s %*.*s", ct, timesize, timesize, ct + 11); } printf("%-*.*s %-*.*s %-*.*s %s \n", NAME_WIDTH, UT_NAMESIZE, bp->ut_name, UT_LINESIZE, UT_LINESIZE, bp->ut_line, HOST_WIDTH, UT_HOSTSIZE, bp->ut_host, tim); if (maxrec && !--maxrec) { close(wfd); return; } } continue; } /* find associated tty */ for (T = ttylist;; T = T->next) { if (!T) { /* add new one */ T = addtty(bp->ut_line); break; } if (!strncmp(T->tty, bp->ut_line, UT_LINESIZE)) break; } /* * print record if not in snapshot mode and wanted * or in snapshot mode and in snapshot range */ if (bp->ut_name[0] && ((want(bp, YES)) || (bp->ut_time < snaptime && (T->logout > snaptime || !T->logout || T->logout < 0)))) { snapfound = 1; if (seconds) { snprintf(tim, sizeof tim, "%ld", (long)bp->ut_time); } else { ct = ctime(&bp->ut_time); snprintf(tim, sizeof tim, "%10.10s %*.*s", ct, timesize, timesize, ct + 11); } printf("%-*.*s %-*.*s %-*.*s %s ", NAME_WIDTH, UT_NAMESIZE, bp->ut_name, UT_LINESIZE, UT_LINESIZE, bp->ut_line, HOST_WIDTH, UT_HOSTSIZE, bp->ut_host, tim); if (!T->logout) puts(" still logged in"); else { if (T->logout < 0) { T->logout = -T->logout; printf("- %s", crmsg); } else { if (seconds) printf("- %ld", (long)T->logout); else printf("- %*.*s", timesize, timesize, ctime(&T->logout)+11); } delta = T->logout - bp->ut_time; if (seconds) printf(" (%ld)\n", (long)delta); else { if (delta < SECSPERDAY) printf(" (%*.*s)\n", timesize, timesize, asctime(gmtime(&delta))+11); else printf(" (%ld+%*.*s)\n", delta / SECSPERDAY, timesize, timesize, asctime(gmtime(&delta))+11); } if (calculate) total += delta; } if (maxrec != -1 && !--maxrec) { close(wfd); return; } } T->logout = bp->ut_time; } } close(wfd); if (calculate) { if ((total / SECSPERDAY) > 0) { int days = (total / SECSPERDAY); total -= (days * SECSPERDAY); printf("\nTotal time: %d days, %*.*s\n", days, timesize, timesize, asctime(gmtime(&total))+11); } else printf("\nTotal time: %*.*s\n", timesize, timesize, asctime(gmtime(&total))+11); } ct = ctime(&buf[0].ut_time); printf("\nwtmp begins %10.10s %*.*s %4.4s\n", ct, timesize, timesize, ct + 11, ct + 20); } /* * see if want this entry */ int want(struct utmp *bp, int check) { struct arg *step; if (check) { /* * 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'; } if (snaptime) /* if snaptime is set, return NO */ 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); } /* * add an entry to a linked list of arguments */ void addarg(int type, char *arg) { struct arg *cur; if (!(cur = (struct arg *)malloc((u_int)sizeof(struct arg)))) err(1, "malloc failure"); cur->next = arglist; cur->type = type; cur->name = arg; arglist = cur; } /* * add an entry to a linked list of ttys */ struct ttytab * addtty(char *ttyname) { struct ttytab *cur; if (!(cur = (struct ttytab *)malloc((u_int)sizeof(struct ttytab)))) err(1, "malloc failure"); cur->next = ttylist; cur->logout = currentout; memmove(cur->tty, ttyname, UT_LINESIZE); return (ttylist = cur); } /* * 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(char *arg) { static char *hostdot, name[MAXHOSTNAMELEN]; static int first = 1; 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'; } /* * convert tty to correct name. */ char * ttyconv(char *arg) { size_t len = 8; 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(len))) err(1, "malloc failure"); if (!strcmp(arg, "co")) (void)strlcpy(mval, "console", len); else snprintf(mval, len, "tty%s", arg); return (mval); } if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) return (arg + 5); return (arg); } /* * Convert the snapshot time in command line given in the format * [[[CC]YY]MMDD]hhmm[.SS]] to a time_t. * Derived from atime_arg1() in usr.bin/touch/touch.c */ time_t dateconv(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]MMDD]hhmm[.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; /* FALLTHROUGH */ 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]MMDD]hhmm[.SS]"); return (timet); } /* * on interrupt, we inform the user how far we've gotten */ void onintr(int signo) { char str[1024], *ct; ct = ctime(&buf[0].ut_time); /* XXX signal race */ snprintf(str, sizeof str, "\ninterrupted %10.10s %8.8s \n", ct, ct + 11); write(STDOUT_FILENO, str, strlen(str)); if (signo == SIGINT) _exit(1); } void usage(void) { extern char *__progname; fprintf(stderr, "usage: %s [-#] [-csT] [-f file] [-n #] [-t tty] [-h host]" " [-d [[[CC]YY]MMDD]hhmm[.SS]] [user ...]\n", __progname); exit(1); }