last.c revision 1590
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. 321590Srgrimes */ 331590Srgrimes 341590Srgrimes#ifndef lint 351590Srgrimesstatic char copyright[] = 361590Srgrimes"@(#) Copyright (c) 1987, 1993, 1994\n\ 371590Srgrimes The Regents of the University of California. All rights reserved.\n"; 381590Srgrimes#endif /* not lint */ 391590Srgrimes 401590Srgrimes#ifndef lint 411590Srgrimesstatic char sccsid[] = "@(#)last.c 8.2 (Berkeley) 4/2/94"; 421590Srgrimes#endif /* not lint */ 431590Srgrimes 441590Srgrimes#include <sys/param.h> 451590Srgrimes#include <sys/stat.h> 461590Srgrimes 471590Srgrimes#include <err.h> 481590Srgrimes#include <fcntl.h> 491590Srgrimes#include <paths.h> 501590Srgrimes#include <signal.h> 511590Srgrimes#include <stdio.h> 521590Srgrimes#include <stdlib.h> 531590Srgrimes#include <string.h> 541590Srgrimes#include <time.h> 551590Srgrimes#include <tzfile.h> 561590Srgrimes#include <unistd.h> 571590Srgrimes#include <utmp.h> 581590Srgrimes 591590Srgrimes#define NO 0 /* false/no */ 601590Srgrimes#define YES 1 /* true/yes */ 611590Srgrimes 621590Srgrimesstatic struct utmp buf[1024]; /* utmp read buffer */ 631590Srgrimes 641590Srgrimestypedef struct arg { 651590Srgrimes char *name; /* argument */ 661590Srgrimes#define HOST_TYPE -2 671590Srgrimes#define TTY_TYPE -3 681590Srgrimes#define USER_TYPE -4 691590Srgrimes int type; /* type of arg */ 701590Srgrimes struct arg *next; /* linked list pointer */ 711590Srgrimes} ARG; 721590SrgrimesARG *arglist; /* head of linked list */ 731590Srgrimes 741590Srgrimestypedef struct ttytab { 751590Srgrimes long logout; /* log out time */ 761590Srgrimes char tty[UT_LINESIZE + 1]; /* terminal name */ 771590Srgrimes struct ttytab *next; /* linked list pointer */ 781590Srgrimes} TTY; 791590SrgrimesTTY *ttylist; /* head of linked list */ 801590Srgrimes 811590Srgrimesstatic long currentout, /* current logout value */ 821590Srgrimes maxrec; /* records to display */ 831590Srgrimesstatic char *file = _PATH_WTMP; /* wtmp file */ 841590Srgrimes 851590Srgrimesvoid addarg __P((int, char *)); 861590SrgrimesTTY *addtty __P((char *)); 871590Srgrimesvoid hostconv __P((char *)); 881590Srgrimesvoid onintr __P((int)); 891590Srgrimeschar *ttyconv __P((char *)); 901590Srgrimesint want __P((struct utmp *, int)); 911590Srgrimesvoid wtmp __P((void)); 921590Srgrimes 931590Srgrimesint 941590Srgrimesmain(argc, argv) 951590Srgrimes int argc; 961590Srgrimes char *argv[]; 971590Srgrimes{ 981590Srgrimes extern int optind; 991590Srgrimes extern char *optarg; 1001590Srgrimes int ch; 1011590Srgrimes char *p; 1021590Srgrimes 1031590Srgrimes maxrec = -1; 1041590Srgrimes while ((ch = getopt(argc, argv, "0123456789f:h:t:")) != EOF) 1051590Srgrimes switch (ch) { 1061590Srgrimes case '0': case '1': case '2': case '3': case '4': 1071590Srgrimes case '5': case '6': case '7': case '8': case '9': 1081590Srgrimes /* 1091590Srgrimes * kludge: last was originally designed to take 1101590Srgrimes * a number after a dash. 1111590Srgrimes */ 1121590Srgrimes if (maxrec == -1) { 1131590Srgrimes p = argv[optind - 1]; 1141590Srgrimes if (p[0] == '-' && p[1] == ch && !p[2]) 1151590Srgrimes maxrec = atol(++p); 1161590Srgrimes else 1171590Srgrimes maxrec = atol(argv[optind] + 1); 1181590Srgrimes if (!maxrec) 1191590Srgrimes exit(0); 1201590Srgrimes } 1211590Srgrimes break; 1221590Srgrimes case 'f': 1231590Srgrimes file = optarg; 1241590Srgrimes break; 1251590Srgrimes case 'h': 1261590Srgrimes hostconv(optarg); 1271590Srgrimes addarg(HOST_TYPE, optarg); 1281590Srgrimes break; 1291590Srgrimes case 't': 1301590Srgrimes addarg(TTY_TYPE, ttyconv(optarg)); 1311590Srgrimes break; 1321590Srgrimes case '?': 1331590Srgrimes default: 1341590Srgrimes (void)fprintf(stderr, 1351590Srgrimes "usage: last [-#] [-f file] [-t tty] [-h hostname] [user ...]\n"); 1361590Srgrimes exit(1); 1371590Srgrimes } 1381590Srgrimes 1391590Srgrimes if (argc) { 1401590Srgrimes setlinebuf(stdout); 1411590Srgrimes for (argv += optind; *argv; ++argv) { 1421590Srgrimes#define COMPATIBILITY 1431590Srgrimes#ifdef COMPATIBILITY 1441590Srgrimes /* code to allow "last p5" to work */ 1451590Srgrimes addarg(TTY_TYPE, ttyconv(*argv)); 1461590Srgrimes#endif 1471590Srgrimes addarg(USER_TYPE, *argv); 1481590Srgrimes } 1491590Srgrimes } 1501590Srgrimes wtmp(); 1511590Srgrimes exit(0); 1521590Srgrimes} 1531590Srgrimes 1541590Srgrimes/* 1551590Srgrimes * wtmp -- 1561590Srgrimes * read through the wtmp file 1571590Srgrimes */ 1581590Srgrimesvoid 1591590Srgrimeswtmp() 1601590Srgrimes{ 1611590Srgrimes struct utmp *bp; /* current structure */ 1621590Srgrimes TTY *T; /* tty list entry */ 1631590Srgrimes struct stat stb; /* stat of file for size */ 1641590Srgrimes long bl, delta; /* time difference */ 1651590Srgrimes int bytes, wfd; 1661590Srgrimes char *ct, *crmsg; 1671590Srgrimes 1681590Srgrimes if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1) 1691590Srgrimes err(1, "%s", file); 1701590Srgrimes bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf); 1711590Srgrimes 1721590Srgrimes (void)time(&buf[0].ut_time); 1731590Srgrimes (void)signal(SIGINT, onintr); 1741590Srgrimes (void)signal(SIGQUIT, onintr); 1751590Srgrimes 1761590Srgrimes while (--bl >= 0) { 1771590Srgrimes if (lseek(wfd, (off_t)(bl * sizeof(buf)), L_SET) == -1 || 1781590Srgrimes (bytes = read(wfd, buf, sizeof(buf))) == -1) 1791590Srgrimes err(1, "%s", file); 1801590Srgrimes for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) { 1811590Srgrimes /* 1821590Srgrimes * if the terminal line is '~', the machine stopped. 1831590Srgrimes * see utmp(5) for more info. 1841590Srgrimes */ 1851590Srgrimes if (bp->ut_line[0] == '~' && !bp->ut_line[1]) { 1861590Srgrimes /* everybody just logged out */ 1871590Srgrimes for (T = ttylist; T; T = T->next) 1881590Srgrimes T->logout = -bp->ut_time; 1891590Srgrimes currentout = -bp->ut_time; 1901590Srgrimes crmsg = strncmp(bp->ut_name, "shutdown", 1911590Srgrimes UT_NAMESIZE) ? "crash" : "shutdown"; 1921590Srgrimes if (want(bp, NO)) { 1931590Srgrimes ct = ctime(&bp->ut_time); 1941590Srgrimes printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n", 1951590Srgrimes UT_NAMESIZE, UT_NAMESIZE, 1961590Srgrimes bp->ut_name, UT_LINESIZE, 1971590Srgrimes UT_LINESIZE, bp->ut_line, 1981590Srgrimes UT_HOSTSIZE, UT_HOSTSIZE, 1991590Srgrimes bp->ut_host, ct, ct + 11); 2001590Srgrimes if (maxrec != -1 && !--maxrec) 2011590Srgrimes return; 2021590Srgrimes } 2031590Srgrimes continue; 2041590Srgrimes } 2051590Srgrimes /* 2061590Srgrimes * if the line is '{' or '|', date got set; see 2071590Srgrimes * utmp(5) for more info. 2081590Srgrimes */ 2091590Srgrimes if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|') 2101590Srgrimes && !bp->ut_line[1]) { 2111590Srgrimes if (want(bp, NO)) { 2121590Srgrimes ct = ctime(&bp->ut_time); 2131590Srgrimes printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n", 2141590Srgrimes UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, 2151590Srgrimes UT_LINESIZE, UT_LINESIZE, bp->ut_line, 2161590Srgrimes UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, 2171590Srgrimes ct, ct + 11); 2181590Srgrimes if (maxrec && !--maxrec) 2191590Srgrimes return; 2201590Srgrimes } 2211590Srgrimes continue; 2221590Srgrimes } 2231590Srgrimes /* find associated tty */ 2241590Srgrimes for (T = ttylist;; T = T->next) { 2251590Srgrimes if (!T) { 2261590Srgrimes /* add new one */ 2271590Srgrimes T = addtty(bp->ut_line); 2281590Srgrimes break; 2291590Srgrimes } 2301590Srgrimes if (!strncmp(T->tty, bp->ut_line, UT_LINESIZE)) 2311590Srgrimes break; 2321590Srgrimes } 2331590Srgrimes if (bp->ut_name[0] && want(bp, YES)) { 2341590Srgrimes ct = ctime(&bp->ut_time); 2351590Srgrimes printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s ", 2361590Srgrimes UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, 2371590Srgrimes UT_LINESIZE, UT_LINESIZE, bp->ut_line, 2381590Srgrimes UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, 2391590Srgrimes ct, ct + 11); 2401590Srgrimes if (!T->logout) 2411590Srgrimes puts(" still logged in"); 2421590Srgrimes else { 2431590Srgrimes if (T->logout < 0) { 2441590Srgrimes T->logout = -T->logout; 2451590Srgrimes printf("- %s", crmsg); 2461590Srgrimes } 2471590Srgrimes else 2481590Srgrimes printf("- %5.5s", 2491590Srgrimes ctime(&T->logout)+11); 2501590Srgrimes delta = T->logout - bp->ut_time; 2511590Srgrimes if (delta < SECSPERDAY) 2521590Srgrimes printf(" (%5.5s)\n", 2531590Srgrimes asctime(gmtime(&delta))+11); 2541590Srgrimes else 2551590Srgrimes printf(" (%ld+%5.5s)\n", 2561590Srgrimes delta / SECSPERDAY, 2571590Srgrimes asctime(gmtime(&delta))+11); 2581590Srgrimes } 2591590Srgrimes if (maxrec != -1 && !--maxrec) 2601590Srgrimes return; 2611590Srgrimes } 2621590Srgrimes T->logout = bp->ut_time; 2631590Srgrimes } 2641590Srgrimes } 2651590Srgrimes ct = ctime(&buf[0].ut_time); 2661590Srgrimes printf("\nwtmp begins %10.10s %5.5s \n", ct, ct + 11); 2671590Srgrimes} 2681590Srgrimes 2691590Srgrimes/* 2701590Srgrimes * want -- 2711590Srgrimes * see if want this entry 2721590Srgrimes */ 2731590Srgrimesint 2741590Srgrimeswant(bp, check) 2751590Srgrimes struct utmp *bp; 2761590Srgrimes int check; 2771590Srgrimes{ 2781590Srgrimes ARG *step; 2791590Srgrimes 2801590Srgrimes if (check) 2811590Srgrimes /* 2821590Srgrimes * when uucp and ftp log in over a network, the entry in 2831590Srgrimes * the utmp file is the name plus their process id. See 2841590Srgrimes * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. 2851590Srgrimes */ 2861590Srgrimes if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) 2871590Srgrimes bp->ut_line[3] = '\0'; 2881590Srgrimes else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) 2891590Srgrimes bp->ut_line[4] = '\0'; 2901590Srgrimes if (!arglist) 2911590Srgrimes return (YES); 2921590Srgrimes 2931590Srgrimes for (step = arglist; step; step = step->next) 2941590Srgrimes switch(step->type) { 2951590Srgrimes case HOST_TYPE: 2961590Srgrimes if (!strncasecmp(step->name, bp->ut_host, UT_HOSTSIZE)) 2971590Srgrimes return (YES); 2981590Srgrimes break; 2991590Srgrimes case TTY_TYPE: 3001590Srgrimes if (!strncmp(step->name, bp->ut_line, UT_LINESIZE)) 3011590Srgrimes return (YES); 3021590Srgrimes break; 3031590Srgrimes case USER_TYPE: 3041590Srgrimes if (!strncmp(step->name, bp->ut_name, UT_NAMESIZE)) 3051590Srgrimes return (YES); 3061590Srgrimes break; 3071590Srgrimes } 3081590Srgrimes return (NO); 3091590Srgrimes} 3101590Srgrimes 3111590Srgrimes/* 3121590Srgrimes * addarg -- 3131590Srgrimes * add an entry to a linked list of arguments 3141590Srgrimes */ 3151590Srgrimesvoid 3161590Srgrimesaddarg(type, arg) 3171590Srgrimes int type; 3181590Srgrimes char *arg; 3191590Srgrimes{ 3201590Srgrimes ARG *cur; 3211590Srgrimes 3221590Srgrimes if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) 3231590Srgrimes err(1, "malloc failure"); 3241590Srgrimes cur->next = arglist; 3251590Srgrimes cur->type = type; 3261590Srgrimes cur->name = arg; 3271590Srgrimes arglist = cur; 3281590Srgrimes} 3291590Srgrimes 3301590Srgrimes/* 3311590Srgrimes * addtty -- 3321590Srgrimes * add an entry to a linked list of ttys 3331590Srgrimes */ 3341590SrgrimesTTY * 3351590Srgrimesaddtty(ttyname) 3361590Srgrimes char *ttyname; 3371590Srgrimes{ 3381590Srgrimes TTY *cur; 3391590Srgrimes 3401590Srgrimes if (!(cur = (TTY *)malloc((u_int)sizeof(TTY)))) 3411590Srgrimes err(1, "malloc failure"); 3421590Srgrimes cur->next = ttylist; 3431590Srgrimes cur->logout = currentout; 3441590Srgrimes memmove(cur->tty, ttyname, UT_LINESIZE); 3451590Srgrimes return (ttylist = cur); 3461590Srgrimes} 3471590Srgrimes 3481590Srgrimes/* 3491590Srgrimes * hostconv -- 3501590Srgrimes * convert the hostname to search pattern; if the supplied host name 3511590Srgrimes * has a domain attached that is the same as the current domain, rip 3521590Srgrimes * off the domain suffix since that's what login(1) does. 3531590Srgrimes */ 3541590Srgrimesvoid 3551590Srgrimeshostconv(arg) 3561590Srgrimes char *arg; 3571590Srgrimes{ 3581590Srgrimes static int first = 1; 3591590Srgrimes static char *hostdot, name[MAXHOSTNAMELEN]; 3601590Srgrimes char *argdot; 3611590Srgrimes 3621590Srgrimes if (!(argdot = strchr(arg, '.'))) 3631590Srgrimes return; 3641590Srgrimes if (first) { 3651590Srgrimes first = 0; 3661590Srgrimes if (gethostname(name, sizeof(name))) 3671590Srgrimes err(1, "gethostname"); 3681590Srgrimes hostdot = strchr(name, '.'); 3691590Srgrimes } 3701590Srgrimes if (hostdot && !strcasecmp(hostdot, argdot)) 3711590Srgrimes *argdot = '\0'; 3721590Srgrimes} 3731590Srgrimes 3741590Srgrimes/* 3751590Srgrimes * ttyconv -- 3761590Srgrimes * convert tty to correct name. 3771590Srgrimes */ 3781590Srgrimeschar * 3791590Srgrimesttyconv(arg) 3801590Srgrimes char *arg; 3811590Srgrimes{ 3821590Srgrimes char *mval; 3831590Srgrimes 3841590Srgrimes /* 3851590Srgrimes * kludge -- we assume that all tty's end with 3861590Srgrimes * a two character suffix. 3871590Srgrimes */ 3881590Srgrimes if (strlen(arg) == 2) { 3891590Srgrimes /* either 6 for "ttyxx" or 8 for "console" */ 3901590Srgrimes if (!(mval = malloc((u_int)8))) 3911590Srgrimes err(1, "malloc failure"); 3921590Srgrimes if (!strcmp(arg, "co")) 3931590Srgrimes (void)strcpy(mval, "console"); 3941590Srgrimes else { 3951590Srgrimes (void)strcpy(mval, "tty"); 3961590Srgrimes (void)strcpy(mval + 3, arg); 3971590Srgrimes } 3981590Srgrimes return (mval); 3991590Srgrimes } 4001590Srgrimes if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 4011590Srgrimes return (arg + 5); 4021590Srgrimes return (arg); 4031590Srgrimes} 4041590Srgrimes 4051590Srgrimes/* 4061590Srgrimes * onintr -- 4071590Srgrimes * on interrupt, we inform the user how far we've gotten 4081590Srgrimes */ 4091590Srgrimesvoid 4101590Srgrimesonintr(signo) 4111590Srgrimes int signo; 4121590Srgrimes{ 4131590Srgrimes char *ct; 4141590Srgrimes 4151590Srgrimes ct = ctime(&buf[0].ut_time); 4161590Srgrimes printf("\ninterrupted %10.10s %5.5s \n", ct, ct + 11); 4171590Srgrimes if (signo == SIGINT) 4181590Srgrimes exit(1); 4191590Srgrimes (void)fflush(stdout); /* fix required for rsh */ 4201590Srgrimes} 421