last.c revision 11547
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 <unistd.h> 561590Srgrimes#include <utmp.h> 5711547Sdg#include <sys/queue.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 7411547SdgLIST_HEAD(ttylisthead, ttytab) ttylist; 7511547Sdg 7611547Sdgstruct ttytab { 771590Srgrimes long logout; /* log out time */ 781590Srgrimes char tty[UT_LINESIZE + 1]; /* terminal name */ 7911547Sdg LIST_ENTRY(ttytab) list; 8011547Sdg}; 811590Srgrimes 821590Srgrimesstatic long currentout, /* current logout value */ 831590Srgrimes maxrec; /* records to display */ 841590Srgrimesstatic char *file = _PATH_WTMP; /* wtmp file */ 851590Srgrimes 861590Srgrimesvoid addarg __P((int, char *)); 871590Srgrimesvoid hostconv __P((char *)); 881590Srgrimesvoid onintr __P((int)); 891590Srgrimeschar *ttyconv __P((char *)); 9011547Sdgint want __P((struct utmp *)); 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 */ 16211547Sdg struct ttytab *tt; /* ttylist 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 16811547Sdg LIST_INIT(&ttylist); 16911547Sdg 1701590Srgrimes if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1) 1711590Srgrimes err(1, "%s", file); 1721590Srgrimes bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf); 1731590Srgrimes 1741590Srgrimes (void)time(&buf[0].ut_time); 1751590Srgrimes (void)signal(SIGINT, onintr); 1761590Srgrimes (void)signal(SIGQUIT, onintr); 1771590Srgrimes 1781590Srgrimes while (--bl >= 0) { 1791590Srgrimes if (lseek(wfd, (off_t)(bl * sizeof(buf)), L_SET) == -1 || 1801590Srgrimes (bytes = read(wfd, buf, sizeof(buf))) == -1) 1811590Srgrimes err(1, "%s", file); 1821590Srgrimes for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) { 1831590Srgrimes /* 1841590Srgrimes * if the terminal line is '~', the machine stopped. 1851590Srgrimes * see utmp(5) for more info. 1861590Srgrimes */ 1871590Srgrimes if (bp->ut_line[0] == '~' && !bp->ut_line[1]) { 1881590Srgrimes /* everybody just logged out */ 18911547Sdg for (tt = ttylist.lh_first; tt; tt = tt->list.le_next) { 19011547Sdg LIST_REMOVE(tt, list); 19111547Sdg free(tt); 19211547Sdg } 1931590Srgrimes currentout = -bp->ut_time; 1941590Srgrimes crmsg = strncmp(bp->ut_name, "shutdown", 1951590Srgrimes UT_NAMESIZE) ? "crash" : "shutdown"; 19611547Sdg if (want(bp)) { 1971590Srgrimes ct = ctime(&bp->ut_time); 19811547Sdg printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n", 1991590Srgrimes UT_NAMESIZE, UT_NAMESIZE, 2001590Srgrimes bp->ut_name, UT_LINESIZE, 2011590Srgrimes UT_LINESIZE, bp->ut_line, 2021590Srgrimes UT_HOSTSIZE, UT_HOSTSIZE, 2031590Srgrimes bp->ut_host, ct, ct + 11); 2041590Srgrimes if (maxrec != -1 && !--maxrec) 2051590Srgrimes return; 2061590Srgrimes } 2071590Srgrimes continue; 2081590Srgrimes } 2091590Srgrimes /* 2101590Srgrimes * if the line is '{' or '|', date got set; see 2111590Srgrimes * utmp(5) for more info. 2121590Srgrimes */ 2131590Srgrimes if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|') 2141590Srgrimes && !bp->ut_line[1]) { 21511547Sdg if (want(bp)) { 2161590Srgrimes ct = ctime(&bp->ut_time); 21711547Sdg printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n", 21811547Sdg UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, 21911547Sdg UT_LINESIZE, UT_LINESIZE, bp->ut_line, 22011547Sdg UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, 22111547Sdg ct, ct + 11); 2221590Srgrimes if (maxrec && !--maxrec) 2231590Srgrimes return; 2241590Srgrimes } 2251590Srgrimes continue; 2261590Srgrimes } 22711547Sdg if (bp->ut_name[0] == '\0' || want(bp)) { 22811547Sdg /* find associated tty */ 22911547Sdg for (tt = ttylist.lh_first; ; tt = tt->list.le_next) { 23011547Sdg if (tt == NULL) { 23111547Sdg /* add new one */ 23211547Sdg tt = malloc(sizeof(struct ttytab)); 23311547Sdg if (tt == NULL) 23411547Sdg err(1, "malloc failure"); 23511547Sdg tt->logout = currentout; 23611547Sdg strncpy(tt->tty, bp->ut_line, UT_LINESIZE); 23711547Sdg LIST_INSERT_HEAD(&ttylist, tt, list); 23811547Sdg break; 23911547Sdg } 24011547Sdg if (!strncmp(tt->tty, bp->ut_line, UT_LINESIZE)) 24111547Sdg break; 2421590Srgrimes } 24311547Sdg if (bp->ut_name[0]) { 24411547Sdg /* 24511547Sdg * when uucp and ftp log in over a network, the entry in 24611547Sdg * the utmp file is the name plus their process id. See 24711547Sdg * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. 24811547Sdg */ 24911547Sdg if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) 25011547Sdg bp->ut_line[3] = '\0'; 25111547Sdg else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) 25211547Sdg bp->ut_line[4] = '\0'; 25311547Sdg ct = ctime(&bp->ut_time); 25411547Sdg printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s ", 25511547Sdg UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, 25611547Sdg UT_LINESIZE, UT_LINESIZE, bp->ut_line, 25711547Sdg UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, 25811547Sdg ct, ct + 11); 25911547Sdg if (!tt->logout) 26011547Sdg puts(" still logged in"); 26111547Sdg else { 26211547Sdg if (tt->logout < 0) { 26311547Sdg tt->logout = -tt->logout; 26411547Sdg printf("- %s", crmsg); 26511547Sdg } 26611547Sdg else 26711547Sdg printf("- %5.5s", 26811547Sdg ctime(&tt->logout)+11); 26911547Sdg delta = tt->logout - bp->ut_time; 27011547Sdg if (delta < 86400) 27111547Sdg printf(" (%5.5s)\n", 27211547Sdg asctime(gmtime(&delta))+11); 27311547Sdg else 27411547Sdg printf(" (%ld+%5.5s)\n", 27511547Sdg delta / 86400, 27611547Sdg asctime(gmtime(&delta))+11); 2771590Srgrimes } 27811547Sdg LIST_REMOVE(tt, list); 27911547Sdg free(tt); 28011547Sdg if (maxrec != -1 && !--maxrec) 28111547Sdg return; 28211547Sdg } else { 28311547Sdg tt->logout = bp->ut_time; 2841590Srgrimes } 2851590Srgrimes } 2861590Srgrimes } 2871590Srgrimes } 2881590Srgrimes ct = ctime(&buf[0].ut_time); 2891590Srgrimes printf("\nwtmp begins %10.10s %5.5s \n", ct, ct + 11); 2901590Srgrimes} 2911590Srgrimes 2921590Srgrimes/* 2931590Srgrimes * want -- 2941590Srgrimes * see if want this entry 2951590Srgrimes */ 2961590Srgrimesint 29711547Sdgwant(bp) 2981590Srgrimes struct utmp *bp; 2991590Srgrimes{ 3001590Srgrimes ARG *step; 3011590Srgrimes 3021590Srgrimes if (!arglist) 3031590Srgrimes return (YES); 3041590Srgrimes 3051590Srgrimes for (step = arglist; step; step = step->next) 3061590Srgrimes switch(step->type) { 3071590Srgrimes case HOST_TYPE: 3081590Srgrimes if (!strncasecmp(step->name, bp->ut_host, UT_HOSTSIZE)) 3091590Srgrimes return (YES); 3101590Srgrimes break; 3111590Srgrimes case TTY_TYPE: 3121590Srgrimes if (!strncmp(step->name, bp->ut_line, UT_LINESIZE)) 3131590Srgrimes return (YES); 3141590Srgrimes break; 3151590Srgrimes case USER_TYPE: 3161590Srgrimes if (!strncmp(step->name, bp->ut_name, UT_NAMESIZE)) 3171590Srgrimes return (YES); 3181590Srgrimes break; 3191590Srgrimes } 3201590Srgrimes return (NO); 3211590Srgrimes} 3221590Srgrimes 3231590Srgrimes/* 3241590Srgrimes * addarg -- 3251590Srgrimes * add an entry to a linked list of arguments 3261590Srgrimes */ 3271590Srgrimesvoid 3281590Srgrimesaddarg(type, arg) 3291590Srgrimes int type; 3301590Srgrimes char *arg; 3311590Srgrimes{ 3321590Srgrimes ARG *cur; 3331590Srgrimes 3341590Srgrimes if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) 3351590Srgrimes err(1, "malloc failure"); 3361590Srgrimes cur->next = arglist; 3371590Srgrimes cur->type = type; 3381590Srgrimes cur->name = arg; 3391590Srgrimes arglist = cur; 3401590Srgrimes} 3411590Srgrimes 3421590Srgrimes/* 3431590Srgrimes * hostconv -- 3441590Srgrimes * convert the hostname to search pattern; if the supplied host name 3451590Srgrimes * has a domain attached that is the same as the current domain, rip 3461590Srgrimes * off the domain suffix since that's what login(1) does. 3471590Srgrimes */ 3481590Srgrimesvoid 3491590Srgrimeshostconv(arg) 3501590Srgrimes char *arg; 3511590Srgrimes{ 3521590Srgrimes static int first = 1; 3531590Srgrimes static char *hostdot, name[MAXHOSTNAMELEN]; 3541590Srgrimes char *argdot; 3551590Srgrimes 3561590Srgrimes if (!(argdot = strchr(arg, '.'))) 3571590Srgrimes return; 3581590Srgrimes if (first) { 3591590Srgrimes first = 0; 3601590Srgrimes if (gethostname(name, sizeof(name))) 3611590Srgrimes err(1, "gethostname"); 3621590Srgrimes hostdot = strchr(name, '.'); 3631590Srgrimes } 3641590Srgrimes if (hostdot && !strcasecmp(hostdot, argdot)) 3651590Srgrimes *argdot = '\0'; 3661590Srgrimes} 3671590Srgrimes 3681590Srgrimes/* 3691590Srgrimes * ttyconv -- 3701590Srgrimes * convert tty to correct name. 3711590Srgrimes */ 3721590Srgrimeschar * 3731590Srgrimesttyconv(arg) 3741590Srgrimes char *arg; 3751590Srgrimes{ 3761590Srgrimes char *mval; 3771590Srgrimes 3781590Srgrimes /* 3791590Srgrimes * kludge -- we assume that all tty's end with 3801590Srgrimes * a two character suffix. 3811590Srgrimes */ 3821590Srgrimes if (strlen(arg) == 2) { 3831590Srgrimes /* either 6 for "ttyxx" or 8 for "console" */ 3841590Srgrimes if (!(mval = malloc((u_int)8))) 3851590Srgrimes err(1, "malloc failure"); 3861590Srgrimes if (!strcmp(arg, "co")) 3871590Srgrimes (void)strcpy(mval, "console"); 3881590Srgrimes else { 3891590Srgrimes (void)strcpy(mval, "tty"); 3901590Srgrimes (void)strcpy(mval + 3, arg); 3911590Srgrimes } 3921590Srgrimes return (mval); 3931590Srgrimes } 3941590Srgrimes if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 3951590Srgrimes return (arg + 5); 3961590Srgrimes return (arg); 3971590Srgrimes} 3981590Srgrimes 3991590Srgrimes/* 4001590Srgrimes * onintr -- 4011590Srgrimes * on interrupt, we inform the user how far we've gotten 4021590Srgrimes */ 4031590Srgrimesvoid 4041590Srgrimesonintr(signo) 4051590Srgrimes int signo; 4061590Srgrimes{ 4071590Srgrimes char *ct; 4081590Srgrimes 4091590Srgrimes ct = ctime(&buf[0].ut_time); 4101590Srgrimes printf("\ninterrupted %10.10s %5.5s \n", ct, ct + 11); 4111590Srgrimes if (signo == SIGINT) 4121590Srgrimes exit(1); 4131590Srgrimes (void)fflush(stdout); /* fix required for rsh */ 4141590Srgrimes} 415