/* * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1987, 1993, 1994 * The Regents of the University of California. All rights reserved. * Copyright (c) 2018 Philip Paeps * * 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. */ #include #include #include #include #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; typedef struct arg { char *name; /* argument */ #define REBOOT_TYPE -1 #define HOST_TYPE -2 #define TTY_TYPE -3 #define USER_TYPE -4 int type; /* type of arg */ struct arg *next; /* linked list pointer */ } ARG; static ARG *arglist; /* head of linked list */ static SLIST_HEAD(, idtab) idlist; struct idtab { time_t logout; /* log out time */ char id[sizeof ((struct utmpx *)0)->ut_id]; /* identifier */ SLIST_ENTRY(idtab) list; }; static const char *crmsg; /* cause of last reboot */ static time_t currentout; /* current logout value */ static long maxrec; /* records to display */ static const char *file = NULL; /* utx.log 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 */ static void addarg(int, char *); static time_t dateconv(char *); static void doentry(struct utmpx *); static void hostconv(char *); static void printentry(struct utmpx *, struct idtab *); static char *ttyconv(char *); static int want(struct utmpx *); static void usage(void); static void wtmp(void); static void usage(void) { xo_error( "usage: last [-swy] [-d [[CC]YY][MMDD]hhmm[.SS]] [-f file] [-h host]\n" " [-n maxrec] [-t tty] [user ...]\n"); exit(EXIT_FAILURE); } int main(int argc, char *argv[]) { int ch; char *p; (void) setlocale(LC_TIME, ""); d_first = (*nl_langinfo(D_MD_ORDER) == 'd'); argc = xo_parse_args(argc, argv); if (argc < 0) exit(EXIT_FAILURE); maxrec = -1; snaptime = 0; while ((ch = getopt(argc, argv, "0123456789d:f:h:n: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 = strchr(argv[optind - 1], ch); if (p == NULL) p = strchr(argv[optind], ch); maxrec = atol(p); if (!maxrec) { if (xo_finish() < 0) xo_err(EXIT_FAILURE, "stdout"); exit(EXIT_SUCCESS); } } break; case 'd': snaptime = dateconv(optarg); break; case 'f': file = optarg; break; case 'h': hostconv(optarg); addarg(HOST_TYPE, optarg); break; case 'n': errno = 0; maxrec = strtol(optarg, &p, 10); if (p == optarg || *p != '\0' || errno != 0 || maxrec <= 0) xo_errx(1, "%s: bad line count", 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 (caph_limit_stdio() < 0) xo_err(1, "can't limit stdio rights"); caph_cache_catpages(); caph_cache_tzdata(); /* Cache UTX database. */ if (setutxdb(UTXDB_LOG, file) != 0) xo_err(1, "%s", file != NULL ? file : "(default utx db)"); if (caph_enter() < 0) xo_err(1, "cap_enter"); if (sflag && width == 8) usage(); if (argc) { setlinebuf(stdout); for (argv += optind; *argv; ++argv) { if (strcmp(*argv, "reboot") == 0) addarg(REBOOT_TYPE, *argv); #define COMPATIBILITY #ifdef COMPATIBILITY /* code to allow "last p5" to work */ addarg(TTY_TYPE, ttyconv(*argv)); #endif addarg(USER_TYPE, *argv); } } wtmp(); if (xo_finish() < 0) xo_err(EXIT_FAILURE, "stdout"); exit(EXIT_SUCCESS); } /* * wtmp -- * read through the utx.log file */ static void wtmp(void) { struct utmpx *buf = NULL; struct utmpx *ut; static unsigned int amount = 0; time_t t; char ct[80]; struct tm *tm; SLIST_INIT(&idlist); (void)time(&t); xo_open_container("last-information"); /* Load the last entries from the file. */ while ((ut = getutxent()) != NULL) { if (amount % 128 == 0) { buf = realloc(buf, (amount + 128) * sizeof *ut); if (buf == NULL) xo_err(1, "realloc"); } memcpy(&buf[amount++], ut, sizeof *ut); if (t > ut->ut_tv.tv_sec) t = ut->ut_tv.tv_sec; } endutxent(); /* Display them in reverse order. */ xo_open_list("last"); while (amount > 0) doentry(&buf[--amount]); xo_close_list("last"); free(buf); tm = localtime(&t); (void) strftime(ct, sizeof(ct), "%+", tm); xo_emit("\n{:utxdb/%s}", (file == NULL) ? "utx.log" : file); xo_attr("seconds", "%lu", (unsigned long) t); xo_emit(" begins {:begins/%hs}\n", ct); xo_close_container("last-information"); } /* * doentry -- * process a single utx.log entry */ static void doentry(struct utmpx *bp) { struct idtab *tt; /* the machine stopped */ if (bp->ut_type == BOOT_TIME || bp->ut_type == SHUTDOWN_TIME) { /* everybody just logged out */ while ((tt = SLIST_FIRST(&idlist)) != NULL) { SLIST_REMOVE_HEAD(&idlist, list); free(tt); } currentout = -bp->ut_tv.tv_sec; crmsg = bp->ut_type != SHUTDOWN_TIME ? "crash" : "shutdown"; /* * if we're in snapshot mode, we want to exit if this * shutdown/reboot appears while we are tracking the * active range */ if (snaptime && snapfound) { if (xo_finish() < 0) xo_err(EXIT_FAILURE, "stdout"); exit(EXIT_SUCCESS); } /* * don't print shutdown/reboot entries unless flagged for */ if (!snaptime && want(bp)) printentry(bp, NULL); return; } /* date got set */ if (bp->ut_type == OLD_TIME || bp->ut_type == NEW_TIME) { if (want(bp) && !snaptime) printentry(bp, NULL); return; } if (bp->ut_type != USER_PROCESS && bp->ut_type != DEAD_PROCESS) return; /* find associated identifier */ SLIST_FOREACH(tt, &idlist, list) if (!memcmp(tt->id, bp->ut_id, sizeof bp->ut_id)) break; if (tt == NULL) { /* add new one */ tt = malloc(sizeof(struct idtab)); if (tt == NULL) xo_errx(1, "malloc failure"); tt->logout = currentout; memcpy(tt->id, bp->ut_id, sizeof bp->ut_id); SLIST_INSERT_HEAD(&idlist, tt, list); } /* * print record if not in snapshot mode and wanted * or in snapshot mode and in snapshot range */ if (bp->ut_type == USER_PROCESS && (want(bp) || (bp->ut_tv.tv_sec < snaptime && (tt->logout > snaptime || tt->logout < 1)))) { snapfound = 1; printentry(bp, tt); } tt->logout = bp->ut_tv.tv_sec; } /* * 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. */ static void printentry(struct utmpx *bp, struct idtab *tt) { char ct[80]; struct tm *tm; time_t delta; /* time difference */ time_t t; if (maxrec != -1 && !maxrec--) { if (xo_finish() < 0) xo_err(EXIT_FAILURE, "stdout"); exit(EXIT_SUCCESS); } xo_open_instance("last"); t = bp->ut_tv.tv_sec; 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); switch (bp->ut_type) { case BOOT_TIME: xo_emit("{:user/%-42s/%s}", "boot time"); break; case SHUTDOWN_TIME: xo_emit("{:user/%-42s/%s}", "shutdown time"); break; case OLD_TIME: xo_emit("{:user/%-42s/%s}", "old time"); break; case NEW_TIME: xo_emit("{:user/%-42s/%s}", "new time"); break; case USER_PROCESS: xo_emit("{:user/%-10s/%s} {:tty/%-8s/%s} {:from/%-22.22s/%s}", bp->ut_user, bp->ut_line, bp->ut_host); break; } xo_attr("seconds", "%lu", (unsigned long)t); xo_emit(" {:login-time/%hs%c/%s}", ct, tt == NULL ? '\n' : ' '); if (tt == NULL) goto end; if (!tt->logout) { xo_emit(" {:logout-time/still logged in}\n"); goto end; } if (tt->logout < 0) { tt->logout = -tt->logout; xo_emit("- {:logout-reason/%s}", crmsg); } else { tm = localtime(&tt->logout); (void) strftime(ct, sizeof(ct), "%R", tm); xo_attr("seconds", "%lu", (unsigned long)tt->logout); xo_emit("- {:logout-time/%s}", ct); } delta = tt->logout - bp->ut_tv.tv_sec; xo_attr("seconds", "%ld", (long)delta); if (sflag) { xo_emit(" ({:session-length/%8ld})\n", (long)delta); } else { tm = gmtime(&delta); (void) strftime(ct, sizeof(ct), width >= 8 ? "%T" : "%R", tm); if (delta < 86400) xo_emit(" ({:session-length/%s})\n", ct); else xo_emit(" ({:session-length/%ld+%s})\n", (long)delta / 86400, ct); } end: xo_close_instance("last"); } /* * want -- * see if want this entry */ static int want(struct utmpx *bp) { ARG *step; if (snaptime) return (NO); if (!arglist) return (YES); for (step = arglist; step; step = step->next) switch(step->type) { case REBOOT_TYPE: if (bp->ut_type == BOOT_TIME || bp->ut_type == SHUTDOWN_TIME) return (YES); break; case HOST_TYPE: if (!strcasecmp(step->name, bp->ut_host)) return (YES); break; case TTY_TYPE: if (!strcmp(step->name, bp->ut_line)) return (YES); break; case USER_TYPE: if (!strcmp(step->name, bp->ut_user)) return (YES); break; } return (NO); } /* * addarg -- * add an entry to a linked list of arguments */ static void addarg(int type, char *arg) { ARG *cur; if ((cur = malloc(sizeof(ARG))) == NULL) xo_errx(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. */ static void hostconv(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))) xo_err(1, "gethostname"); hostdot = strchr(name, '.'); } if (hostdot && !strcasecmp(hostdot, argdot)) *argdot = '\0'; } /* * ttyconv -- * convert tty to correct name. */ static char * ttyconv(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(8)) == NULL) xo_errx(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 */ static time_t dateconv(char *arg) { time_t timet; struct tm *t; int yearset; char *p; /* Start with the current time. */ if (time(&timet) < 0) xo_err(1, "time"); if ((t = localtime(&timet)) == NULL) xo_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; /* 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: xo_errx(1, "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); return timet; }