last.c revision 60938
11590Srgrimes/* 21590Srgrimes * Copyright (c) 1987, 1993, 1994 31590Srgrimes * The Regents of the University of California. All rights reserved. 41590Srgrimes * 51590Srgrimes * Redistribution and use in source and binary forms, with or without 61590Srgrimes * modification, are permitted provided that the following conditions 71590Srgrimes * are met: 81590Srgrimes * 1. Redistributions of source code must retain the above copyright 91590Srgrimes * notice, this list of conditions and the following disclaimer. 101590Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111590Srgrimes * notice, this list of conditions and the following disclaimer in the 121590Srgrimes * documentation and/or other materials provided with the distribution. 131590Srgrimes * 3. All advertising materials mentioning features or use of this software 141590Srgrimes * must display the following acknowledgement: 151590Srgrimes * This product includes software developed by the University of 161590Srgrimes * California, Berkeley and its contributors. 171590Srgrimes * 4. Neither the name of the University nor the names of its contributors 181590Srgrimes * may be used to endorse or promote products derived from this software 191590Srgrimes * without specific prior written permission. 201590Srgrimes * 211590Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221590Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231590Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241590Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251590Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261590Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271590Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281590Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291590Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301590Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311590Srgrimes * SUCH DAMAGE. 3260833Sjake * 3360833Sjake * $FreeBSD: head/usr.bin/last/last.c 60938 2000-05-26 02:09:24Z jake $ 341590Srgrimes */ 351590Srgrimes 361590Srgrimes#ifndef lint 371590Srgrimesstatic char copyright[] = 381590Srgrimes"@(#) Copyright (c) 1987, 1993, 1994\n\ 391590Srgrimes The Regents of the University of California. All rights reserved.\n"; 401590Srgrimes#endif /* not lint */ 411590Srgrimes 421590Srgrimes#ifndef lint 431590Srgrimesstatic char sccsid[] = "@(#)last.c 8.2 (Berkeley) 4/2/94"; 441590Srgrimes#endif /* not lint */ 451590Srgrimes 461590Srgrimes#include <sys/param.h> 471590Srgrimes#include <sys/stat.h> 481590Srgrimes 491590Srgrimes#include <err.h> 501590Srgrimes#include <fcntl.h> 5116438Sache#include <locale.h> 521590Srgrimes#include <paths.h> 531590Srgrimes#include <signal.h> 541590Srgrimes#include <stdio.h> 551590Srgrimes#include <stdlib.h> 561590Srgrimes#include <string.h> 571590Srgrimes#include <time.h> 581590Srgrimes#include <unistd.h> 591590Srgrimes#include <utmp.h> 6011547Sdg#include <sys/queue.h> 611590Srgrimes 621590Srgrimes#define NO 0 /* false/no */ 631590Srgrimes#define YES 1 /* true/yes */ 641590Srgrimes 651590Srgrimesstatic struct utmp buf[1024]; /* utmp read buffer */ 661590Srgrimes 671590Srgrimestypedef struct arg { 681590Srgrimes char *name; /* argument */ 691590Srgrimes#define HOST_TYPE -2 701590Srgrimes#define TTY_TYPE -3 711590Srgrimes#define USER_TYPE -4 721590Srgrimes int type; /* type of arg */ 731590Srgrimes struct arg *next; /* linked list pointer */ 741590Srgrimes} ARG; 751590SrgrimesARG *arglist; /* head of linked list */ 761590Srgrimes 7760938SjakeLIST_HEAD(ttylisthead, ttytab) ttylist; 7811547Sdg 7911547Sdgstruct ttytab { 8036062Sjb time_t logout; /* log out time */ 811590Srgrimes char tty[UT_LINESIZE + 1]; /* terminal name */ 8260938Sjake LIST_ENTRY(ttytab) list; 8311547Sdg}; 841590Srgrimes 851590Srgrimesstatic long currentout, /* current logout value */ 861590Srgrimes maxrec; /* records to display */ 871590Srgrimesstatic char *file = _PATH_WTMP; /* wtmp file */ 8836434Sdannystatic int sflag = 0; /* show delta in seconds */ 8936434Sdannystatic int width = 5; /* show seconds in delta */ 901590Srgrimes 911590Srgrimesvoid addarg __P((int, char *)); 921590Srgrimesvoid hostconv __P((char *)); 931590Srgrimesvoid onintr __P((int)); 941590Srgrimeschar *ttyconv __P((char *)); 9511547Sdgint want __P((struct utmp *)); 961590Srgrimesvoid wtmp __P((void)); 971590Srgrimes 9836434Sdannyvoid 9936434Sdannyusage(void) 10036434Sdanny{ 10136434Sdanny (void)fprintf(stderr, 10236434Sdanny "usage: last [-#] [-f file] [-h hostname] [-t tty] [-s|w] [user ...]\n"); 10336434Sdanny exit(1); 10436434Sdanny} 10536434Sdanny 1061590Srgrimesint 1071590Srgrimesmain(argc, argv) 1081590Srgrimes int argc; 1091590Srgrimes char *argv[]; 1101590Srgrimes{ 1111590Srgrimes extern int optind; 1121590Srgrimes extern char *optarg; 1131590Srgrimes int ch; 1141590Srgrimes char *p; 1151590Srgrimes 11616438Sache (void) setlocale(LC_TIME, ""); 11716438Sache 1181590Srgrimes maxrec = -1; 11936434Sdanny while ((ch = getopt(argc, argv, "0123456789f:h:st:w")) != -1) 1201590Srgrimes switch (ch) { 1211590Srgrimes case '0': case '1': case '2': case '3': case '4': 1221590Srgrimes case '5': case '6': case '7': case '8': case '9': 1231590Srgrimes /* 1241590Srgrimes * kludge: last was originally designed to take 1251590Srgrimes * a number after a dash. 1261590Srgrimes */ 1271590Srgrimes if (maxrec == -1) { 1281590Srgrimes p = argv[optind - 1]; 1291590Srgrimes if (p[0] == '-' && p[1] == ch && !p[2]) 1301590Srgrimes maxrec = atol(++p); 1311590Srgrimes else 1321590Srgrimes maxrec = atol(argv[optind] + 1); 1331590Srgrimes if (!maxrec) 1341590Srgrimes exit(0); 1351590Srgrimes } 1361590Srgrimes break; 1371590Srgrimes case 'f': 1381590Srgrimes file = optarg; 1391590Srgrimes break; 1401590Srgrimes case 'h': 1411590Srgrimes hostconv(optarg); 1421590Srgrimes addarg(HOST_TYPE, optarg); 1431590Srgrimes break; 14436434Sdanny case 's': 14536434Sdanny sflag++; /* Show delta as seconds */ 14636434Sdanny break; 1471590Srgrimes case 't': 1481590Srgrimes addarg(TTY_TYPE, ttyconv(optarg)); 1491590Srgrimes break; 15036434Sdanny case 'w': 15136434Sdanny width = 8; 15236434Sdanny break; 1531590Srgrimes case '?': 1541590Srgrimes default: 15536434Sdanny usage(); 1561590Srgrimes } 1571590Srgrimes 15836434Sdanny if (sflag && width == 8) usage(); 15936434Sdanny 1601590Srgrimes if (argc) { 1611590Srgrimes setlinebuf(stdout); 1621590Srgrimes for (argv += optind; *argv; ++argv) { 1631590Srgrimes#define COMPATIBILITY 1641590Srgrimes#ifdef COMPATIBILITY 1651590Srgrimes /* code to allow "last p5" to work */ 1661590Srgrimes addarg(TTY_TYPE, ttyconv(*argv)); 1671590Srgrimes#endif 1681590Srgrimes addarg(USER_TYPE, *argv); 1691590Srgrimes } 1701590Srgrimes } 1711590Srgrimes wtmp(); 1721590Srgrimes exit(0); 1731590Srgrimes} 1741590Srgrimes 1751590Srgrimes/* 1761590Srgrimes * wtmp -- 1771590Srgrimes * read through the wtmp file 1781590Srgrimes */ 1791590Srgrimesvoid 1801590Srgrimeswtmp() 1811590Srgrimes{ 1821590Srgrimes struct utmp *bp; /* current structure */ 18319223Sjoerg struct ttytab *tt, *ttx; /* ttylist entry */ 1841590Srgrimes struct stat stb; /* stat of file for size */ 18536062Sjb long bl; 18636062Sjb time_t delta; /* time difference */ 1871590Srgrimes int bytes, wfd; 18816438Sache char *crmsg; 18916438Sache char ct[80]; 19016438Sache struct tm *tm; 1911590Srgrimes 19211547Sdg LIST_INIT(&ttylist); 19311547Sdg 1941590Srgrimes if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1) 1951590Srgrimes err(1, "%s", file); 1961590Srgrimes bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf); 1971590Srgrimes 1981590Srgrimes (void)time(&buf[0].ut_time); 1991590Srgrimes (void)signal(SIGINT, onintr); 2001590Srgrimes (void)signal(SIGQUIT, onintr); 2011590Srgrimes 2021590Srgrimes while (--bl >= 0) { 2031590Srgrimes if (lseek(wfd, (off_t)(bl * sizeof(buf)), L_SET) == -1 || 2041590Srgrimes (bytes = read(wfd, buf, sizeof(buf))) == -1) 2051590Srgrimes err(1, "%s", file); 2061590Srgrimes for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) { 2071590Srgrimes /* 2081590Srgrimes * if the terminal line is '~', the machine stopped. 2091590Srgrimes * see utmp(5) for more info. 2101590Srgrimes */ 2111590Srgrimes if (bp->ut_line[0] == '~' && !bp->ut_line[1]) { 2121590Srgrimes /* everybody just logged out */ 21319223Sjoerg for (tt = ttylist.lh_first; tt;) { 21411547Sdg LIST_REMOVE(tt, list); 21519223Sjoerg ttx = tt; 21619223Sjoerg tt = tt->list.le_next; 21719223Sjoerg free(ttx); 21811547Sdg } 2191590Srgrimes currentout = -bp->ut_time; 2201590Srgrimes crmsg = strncmp(bp->ut_name, "shutdown", 2211590Srgrimes UT_NAMESIZE) ? "crash" : "shutdown"; 22211547Sdg if (want(bp)) { 22316438Sache tm = localtime(&bp->ut_time); 22416438Sache (void) strftime(ct, sizeof(ct), "%c", tm); 22520158Sache printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n", 2261590Srgrimes UT_NAMESIZE, UT_NAMESIZE, 2271590Srgrimes bp->ut_name, UT_LINESIZE, 2281590Srgrimes UT_LINESIZE, bp->ut_line, 2291590Srgrimes UT_HOSTSIZE, UT_HOSTSIZE, 2301590Srgrimes bp->ut_host, ct, ct + 11); 2311590Srgrimes if (maxrec != -1 && !--maxrec) 2321590Srgrimes return; 2331590Srgrimes } 2341590Srgrimes continue; 2351590Srgrimes } 2361590Srgrimes /* 2371590Srgrimes * if the line is '{' or '|', date got set; see 2381590Srgrimes * utmp(5) for more info. 2391590Srgrimes */ 2401590Srgrimes if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|') 2411590Srgrimes && !bp->ut_line[1]) { 24211547Sdg if (want(bp)) { 24316438Sache tm = localtime(&bp->ut_time); 24416438Sache (void) strftime(ct, sizeof(ct), "%c", tm); 24520158Sache printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n", 24611547Sdg UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, 24711547Sdg UT_LINESIZE, UT_LINESIZE, bp->ut_line, 24811547Sdg UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, 24911547Sdg ct, ct + 11); 2501590Srgrimes if (maxrec && !--maxrec) 2511590Srgrimes return; 2521590Srgrimes } 2531590Srgrimes continue; 2541590Srgrimes } 25511547Sdg if (bp->ut_name[0] == '\0' || want(bp)) { 25611547Sdg /* find associated tty */ 25711547Sdg for (tt = ttylist.lh_first; ; tt = tt->list.le_next) { 25811547Sdg if (tt == NULL) { 25911547Sdg /* add new one */ 26011547Sdg tt = malloc(sizeof(struct ttytab)); 26111547Sdg if (tt == NULL) 26211547Sdg err(1, "malloc failure"); 26311547Sdg tt->logout = currentout; 26411547Sdg strncpy(tt->tty, bp->ut_line, UT_LINESIZE); 26511547Sdg LIST_INSERT_HEAD(&ttylist, tt, list); 26611547Sdg break; 26711547Sdg } 26811547Sdg if (!strncmp(tt->tty, bp->ut_line, UT_LINESIZE)) 26911547Sdg break; 2701590Srgrimes } 27111547Sdg if (bp->ut_name[0]) { 27211547Sdg /* 27311547Sdg * when uucp and ftp log in over a network, the entry in 27411547Sdg * the utmp file is the name plus their process id. See 27511547Sdg * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. 27611547Sdg */ 27711547Sdg if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) 27811547Sdg bp->ut_line[3] = '\0'; 27911547Sdg else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) 28011547Sdg bp->ut_line[4] = '\0'; 28116438Sache tm = localtime(&bp->ut_time); 28216438Sache (void) strftime(ct, sizeof(ct), "%c", tm); 28320158Sache printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s ", 28411547Sdg UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, 28511547Sdg UT_LINESIZE, UT_LINESIZE, bp->ut_line, 28611547Sdg UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, 28711547Sdg ct, ct + 11); 28811547Sdg if (!tt->logout) 28911547Sdg puts(" still logged in"); 29011547Sdg else { 29111547Sdg if (tt->logout < 0) { 29211547Sdg tt->logout = -tt->logout; 29311547Sdg printf("- %s", crmsg); 29411547Sdg } 29516438Sache else { 29616438Sache tm = localtime(&tt->logout); 29716438Sache (void) strftime(ct, sizeof(ct), "%c", tm); 29816438Sache printf("- %5.5s", ct + 11); 29916438Sache } 30011547Sdg delta = tt->logout - bp->ut_time; 30136434Sdanny if ( sflag ) { 30236434Sdanny printf(" (%8lu)\n", 30336434Sdanny delta); 30436434Sdanny } else { 30536434Sdanny tm = gmtime(&delta); 30636434Sdanny (void) strftime(ct, sizeof(ct), "%c", tm); 30736434Sdanny if (delta < 86400) 30836434Sdanny printf(" (%*.*s)\n", width, width, ct + 11); 30936434Sdanny else 31036434Sdanny printf(" (%ld+%*.*s)\n", 31136434Sdanny delta / 86400, width, width, ct + 11); 31236434Sdanny } 3131590Srgrimes } 31411547Sdg LIST_REMOVE(tt, list); 31511547Sdg free(tt); 31611547Sdg if (maxrec != -1 && !--maxrec) 31711547Sdg return; 31811547Sdg } else { 31911547Sdg tt->logout = bp->ut_time; 3201590Srgrimes } 3211590Srgrimes } 3221590Srgrimes } 3231590Srgrimes } 32416438Sache tm = localtime(&buf[0].ut_time); 32535658Ssteve (void) strftime(ct, sizeof(ct), "\nwtmp begins %c\n", tm); 32635658Ssteve printf(ct); 3271590Srgrimes} 3281590Srgrimes 3291590Srgrimes/* 3301590Srgrimes * want -- 3311590Srgrimes * see if want this entry 3321590Srgrimes */ 3331590Srgrimesint 33411547Sdgwant(bp) 3351590Srgrimes struct utmp *bp; 3361590Srgrimes{ 3371590Srgrimes ARG *step; 3381590Srgrimes 3391590Srgrimes if (!arglist) 3401590Srgrimes return (YES); 3411590Srgrimes 3421590Srgrimes for (step = arglist; step; step = step->next) 3431590Srgrimes switch(step->type) { 3441590Srgrimes case HOST_TYPE: 3451590Srgrimes if (!strncasecmp(step->name, bp->ut_host, UT_HOSTSIZE)) 3461590Srgrimes return (YES); 3471590Srgrimes break; 3481590Srgrimes case TTY_TYPE: 3491590Srgrimes if (!strncmp(step->name, bp->ut_line, UT_LINESIZE)) 3501590Srgrimes return (YES); 3511590Srgrimes break; 3521590Srgrimes case USER_TYPE: 3531590Srgrimes if (!strncmp(step->name, bp->ut_name, UT_NAMESIZE)) 3541590Srgrimes return (YES); 3551590Srgrimes break; 3561590Srgrimes } 3571590Srgrimes return (NO); 3581590Srgrimes} 3591590Srgrimes 3601590Srgrimes/* 3611590Srgrimes * addarg -- 3621590Srgrimes * add an entry to a linked list of arguments 3631590Srgrimes */ 3641590Srgrimesvoid 3651590Srgrimesaddarg(type, arg) 3661590Srgrimes int type; 3671590Srgrimes char *arg; 3681590Srgrimes{ 3691590Srgrimes ARG *cur; 3701590Srgrimes 3711590Srgrimes if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) 3721590Srgrimes err(1, "malloc failure"); 3731590Srgrimes cur->next = arglist; 3741590Srgrimes cur->type = type; 3751590Srgrimes cur->name = arg; 3761590Srgrimes arglist = cur; 3771590Srgrimes} 3781590Srgrimes 3791590Srgrimes/* 3801590Srgrimes * hostconv -- 3811590Srgrimes * convert the hostname to search pattern; if the supplied host name 3821590Srgrimes * has a domain attached that is the same as the current domain, rip 3831590Srgrimes * off the domain suffix since that's what login(1) does. 3841590Srgrimes */ 3851590Srgrimesvoid 3861590Srgrimeshostconv(arg) 3871590Srgrimes char *arg; 3881590Srgrimes{ 3891590Srgrimes static int first = 1; 3901590Srgrimes static char *hostdot, name[MAXHOSTNAMELEN]; 3911590Srgrimes char *argdot; 3921590Srgrimes 3931590Srgrimes if (!(argdot = strchr(arg, '.'))) 3941590Srgrimes return; 3951590Srgrimes if (first) { 3961590Srgrimes first = 0; 3971590Srgrimes if (gethostname(name, sizeof(name))) 3981590Srgrimes err(1, "gethostname"); 3991590Srgrimes hostdot = strchr(name, '.'); 4001590Srgrimes } 4011590Srgrimes if (hostdot && !strcasecmp(hostdot, argdot)) 4021590Srgrimes *argdot = '\0'; 4031590Srgrimes} 4041590Srgrimes 4051590Srgrimes/* 4061590Srgrimes * ttyconv -- 4071590Srgrimes * convert tty to correct name. 4081590Srgrimes */ 4091590Srgrimeschar * 4101590Srgrimesttyconv(arg) 4111590Srgrimes char *arg; 4121590Srgrimes{ 4131590Srgrimes char *mval; 4141590Srgrimes 4151590Srgrimes /* 4161590Srgrimes * kludge -- we assume that all tty's end with 4171590Srgrimes * a two character suffix. 4181590Srgrimes */ 4191590Srgrimes if (strlen(arg) == 2) { 4201590Srgrimes /* either 6 for "ttyxx" or 8 for "console" */ 4211590Srgrimes if (!(mval = malloc((u_int)8))) 4221590Srgrimes err(1, "malloc failure"); 4231590Srgrimes if (!strcmp(arg, "co")) 4241590Srgrimes (void)strcpy(mval, "console"); 4251590Srgrimes else { 4261590Srgrimes (void)strcpy(mval, "tty"); 4271590Srgrimes (void)strcpy(mval + 3, arg); 4281590Srgrimes } 4291590Srgrimes return (mval); 4301590Srgrimes } 4311590Srgrimes if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 4321590Srgrimes return (arg + 5); 4331590Srgrimes return (arg); 4341590Srgrimes} 4351590Srgrimes 4361590Srgrimes/* 4371590Srgrimes * onintr -- 4381590Srgrimes * on interrupt, we inform the user how far we've gotten 4391590Srgrimes */ 4401590Srgrimesvoid 4411590Srgrimesonintr(signo) 4421590Srgrimes int signo; 4431590Srgrimes{ 44416438Sache char ct[80]; 44516438Sache struct tm *tm; 4461590Srgrimes 44716438Sache tm = localtime(&buf[0].ut_time); 44816438Sache (void) strftime(ct, sizeof(ct), "%c", tm); 4491590Srgrimes printf("\ninterrupted %10.10s %5.5s \n", ct, ct + 11); 4501590Srgrimes if (signo == SIGINT) 4511590Srgrimes exit(1); 4521590Srgrimes (void)fflush(stdout); /* fix required for rsh */ 4531590Srgrimes} 454