/* $OpenBSD: last.c,v 1.2 1996/06/26 05:34:51 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. 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 1.2 1996/06/26 05:34:51 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 */ static struct utmp buf[1024]; /* utmp read buffer */ typedef 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 */ } ARG; ARG *arglist; /* head of linked list */ typedef struct ttytab { time_t logout; /* log out time */ char tty[UT_LINESIZE + 1]; /* terminal name */ struct ttytab *next; /* linked list pointer */ } TTY; TTY *ttylist; /* head of linked list */ static time_t currentout; /* current logout value */ static long maxrec; /* records to display */ static char *file = _PATH_WTMP; /* wtmp file */ void addarg __P((int, char *)); TTY *addtty __P((char *)); void hostconv __P((char *)); void onintr __P((int)); char *ttyconv __P((char *)); int want __P((struct utmp *, int)); void wtmp __P((void)); int main(argc, argv) int argc; char *argv[]; { extern int optind; extern char *optarg; int ch; char *p; maxrec = -1; while ((ch = getopt(argc, argv, "0123456789f:h:t:")) != EOF) 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 = argv[optind - 1]; if (p[0] == '-' && p[1] == ch && !p[2]) maxrec = atol(++p); else maxrec = atol(argv[optind] + 1); if (!maxrec) exit(0); } break; case 'f': file = optarg; break; case 'h': hostconv(optarg); addarg(HOST_TYPE, optarg); break; case 't': addarg(TTY_TYPE, ttyconv(optarg)); break; case '?': default: (void)fprintf(stderr, "usage: last [-#] [-f file] [-t tty] [-h hostname] [user ...]\n"); exit(1); } 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); } } wtmp(); exit(0); } /* * wtmp -- * read through the wtmp file */ void wtmp() { struct utmp *bp; /* current structure */ TTY *T; /* tty list entry */ struct stat stb; /* stat of file for size */ time_t bl, delta; /* time difference */ int bytes, wfd; char *ct, *crmsg; 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); (void)time(&buf[0].ut_time); (void)signal(SIGINT, onintr); (void)signal(SIGQUIT, onintr); while (--bl >= 0) { if (lseek(wfd, (off_t)(bl * sizeof(buf)), L_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 (want(bp, NO)) { ct = ctime(&bp->ut_time); printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n", UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, UT_LINESIZE, UT_LINESIZE, bp->ut_line, UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, ct, ct + 11); if (maxrec != -1 && !--maxrec) 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)) { ct = ctime(&bp->ut_time); printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n", UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, UT_LINESIZE, UT_LINESIZE, bp->ut_line, UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, ct, ct + 11); if (maxrec && !--maxrec) 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; } if (bp->ut_name[0] && want(bp, YES)) { ct = ctime(&bp->ut_time); printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s ", UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, UT_LINESIZE, UT_LINESIZE, bp->ut_line, UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, ct, ct + 11); if (!T->logout) puts(" still logged in"); else { if (T->logout < 0) { T->logout = -T->logout; printf("- %s", crmsg); } else printf("- %5.5s", ctime(&T->logout)+11); delta = T->logout - bp->ut_time; if (delta < SECSPERDAY) printf(" (%5.5s)\n", asctime(gmtime(&delta))+11); else printf(" (%ld+%5.5s)\n", delta / SECSPERDAY, asctime(gmtime(&delta))+11); } if (maxrec != -1 && !--maxrec) return; } T->logout = bp->ut_time; } } ct = ctime(&buf[0].ut_time); printf("\nwtmp begins %10.10s %5.5s \n", ct, ct + 11); } /* * want -- * see if want this entry */ int want(bp, check) struct utmp *bp; int check; { 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 (!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); } /* * addarg -- * add an entry to a linked list of arguments */ void addarg(type, arg) int type; char *arg; { ARG *cur; if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) err(1, "malloc failure"); cur->next = arglist; cur->type = type; cur->name = arg; arglist = cur; } /* * addtty -- * add an entry to a linked list of ttys */ TTY * addtty(ttyname) char *ttyname; { TTY *cur; if (!(cur = (TTY *)malloc((u_int)sizeof(TTY)))) err(1, "malloc failure"); cur->next = ttylist; cur->logout = currentout; memmove(cur->tty, ttyname, UT_LINESIZE); return (ttylist = 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. */ void hostconv(arg) 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))) err(1, "gethostname"); hostdot = strchr(name, '.'); } if (hostdot && !strcasecmp(hostdot, argdot)) *argdot = '\0'; } /* * ttyconv -- * convert tty to correct name. */ char * ttyconv(arg) 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((u_int)8))) err(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); } /* * onintr -- * on interrupt, we inform the user how far we've gotten */ void onintr(signo) int signo; { char *ct; ct = ctime(&buf[0].ut_time); printf("\ninterrupted %10.10s %5.5s \n", ct, ct + 11); if (signo == SIGINT) exit(1); (void)fflush(stdout); /* fix required for rsh */ }