logwtmp.c revision 16433
11592Srgrimes/* 21592Srgrimes * Copyright (c) 1988, 1993 31592Srgrimes * The Regents of the University of California. All rights reserved. 41592Srgrimes * 51592Srgrimes * Redistribution and use in source and binary forms, with or without 61592Srgrimes * modification, are permitted provided that the following conditions 71592Srgrimes * are met: 81592Srgrimes * 1. Redistributions of source code must retain the above copyright 91592Srgrimes * notice, this list of conditions and the following disclaimer. 101592Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111592Srgrimes * notice, this list of conditions and the following disclaimer in the 121592Srgrimes * documentation and/or other materials provided with the distribution. 131592Srgrimes * 3. All advertising materials mentioning features or use of this software 141592Srgrimes * must display the following acknowledgement: 151592Srgrimes * This product includes software developed by the University of 161592Srgrimes * California, Berkeley and its contributors. 171592Srgrimes * 4. Neither the name of the University nor the names of its contributors 181592Srgrimes * may be used to endorse or promote products derived from this software 191592Srgrimes * without specific prior written permission. 201592Srgrimes * 211592Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221592Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231592Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241592Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251592Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261592Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271592Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281592Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291592Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301592Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311592Srgrimes * SUCH DAMAGE. 321592Srgrimes * 331592Srgrimes */ 341592Srgrimes 351592Srgrimes#ifndef lint 361592Srgrimesstatic char sccsid[] = "@(#)logwtmp.c 8.1 (Berkeley) 6/4/93"; 371592Srgrimes#endif /* not lint */ 381592Srgrimes 391592Srgrimes#include <sys/types.h> 401592Srgrimes#include <sys/stat.h> 4116433Sache#include <netinet/in.h> 4216433Sache#include <arpa/inet.h> 431592Srgrimes 441592Srgrimes#include <fcntl.h> 4516433Sache#include <time.h> 4616433Sache#include <netdb.h> 471592Srgrimes#include <utmp.h> 481592Srgrimes#include <unistd.h> 491592Srgrimes#include <stdio.h> 501592Srgrimes#include <string.h> 511592Srgrimes#include "extern.h" 521592Srgrimes 531592Srgrimesstatic int fd = -1; 541592Srgrimes 551592Srgrimes/* 561592Srgrimes * Modified version of logwtmp that holds wtmp file open 571592Srgrimes * after first call, for use with ftp (which may chroot 581592Srgrimes * after login, but before logout). 591592Srgrimes */ 601592Srgrimesvoid 611592Srgrimeslogwtmp(line, name, host) 621592Srgrimes char *line, *name, *host; 631592Srgrimes{ 641592Srgrimes struct utmp ut; 651592Srgrimes struct stat buf; 661592Srgrimes 6716433Sache if (strlen(host) > UT_HOSTSIZE) { 6816433Sache struct hostent *hp = gethostbyname(host); 6916433Sache 7016433Sache if (hp != NULL) { 7116433Sache struct in_addr in; 7216433Sache 7316433Sache memmove(&in, hp->h_addr, sizeof(in)); 7416433Sache host = inet_ntoa(in); 7516433Sache } else 7616433Sache host = "invalid hostname"; 7716433Sache } 7816433Sache 791592Srgrimes if (fd < 0 && (fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) < 0) 801592Srgrimes return; 811592Srgrimes if (fstat(fd, &buf) == 0) { 821592Srgrimes (void)strncpy(ut.ut_line, line, sizeof(ut.ut_line)); 831592Srgrimes (void)strncpy(ut.ut_name, name, sizeof(ut.ut_name)); 841592Srgrimes (void)strncpy(ut.ut_host, host, sizeof(ut.ut_host)); 851592Srgrimes (void)time(&ut.ut_time); 861592Srgrimes if (write(fd, (char *)&ut, sizeof(struct utmp)) != 871592Srgrimes sizeof(struct utmp)) 881592Srgrimes (void)ftruncate(fd, buf.st_size); 891592Srgrimes } 901592Srgrimes} 91