/* $OpenBSD: logutmp.c,v 1.4 2001/12/07 18:45:32 mpech Exp $ */ /* * Portions Copyright (c) 1988, 1993 * The Regents of the University of California. All rights reserved. * Portions Copyright (c) 1996, Jason Downs. 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. */ #include <sys/types.h> #include <fcntl.h> #include <unistd.h> #include <stdlib.h> #include <utmp.h> #include <stdio.h> #include <string.h> #include <ttyent.h> typedef struct utmp UTMP; static int fd = -1; static int topslot = -1; /* * Special versions of login()/logout() which hold the utmp file open, * for use with ftpd. */ void login(ut) UTMP *ut; { UTMP ubuf; /* * First, loop through /etc/ttys, if needed, to initialize the * top of the tty slots, since ftpd has no tty. */ if (topslot < 0) { topslot = 0; while (getttyent() != (struct ttyent *)NULL) topslot++; } if ((topslot < 0) || ((fd < 0) && (fd = open(_PATH_UTMP, O_RDWR|O_CREAT, 0644)) < 0)) return; /* * Now find a slot that's not in use... */ (void)lseek(fd, (off_t)(topslot * sizeof(UTMP)), SEEK_SET); while (1) { if (read(fd, &ubuf, sizeof(UTMP)) == sizeof(UTMP)) { if (!ubuf.ut_name[0]) { (void)lseek(fd, -(off_t)sizeof(UTMP), SEEK_CUR); break; } topslot++; } else { (void)lseek(fd, (off_t)(topslot * sizeof(UTMP)), SEEK_SET); break; } } (void)write(fd, ut, sizeof(UTMP)); } int logout(line) char *line; { UTMP ut; int rval; rval = 0; if (fd < 0) return(rval); (void)lseek(fd, 0, SEEK_SET); while (read(fd, &ut, sizeof(UTMP)) == sizeof(UTMP)) { if (!ut.ut_name[0] || strncmp(ut.ut_line, line, UT_LINESIZE)) continue; bzero(ut.ut_name, UT_NAMESIZE); bzero(ut.ut_host, UT_HOSTSIZE); (void)time(&ut.ut_time); (void)lseek(fd, -(off_t)sizeof(UTMP), SEEK_CUR); (void)write(fd, &ut, sizeof(UTMP)); rval = 1; } return(rval); }