ftpd.tproj/logwtmp.c

   1 /*
   2  * Copyright (c) 1988, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifndef lint
  35 #if 0
  36 static char sccsid[] = "@(#)logwtmp.c   8.1 (Berkeley) 6/4/93";
  37 #endif
  38 static const char rcsid[] =
  39   "$FreeBSD: src/libexec/ftpd/logwtmp.c,v 1.9 2000/01/27 09:28:21 shin Exp $";
  40 #endif /* not lint */
  41
  42 #include <sys/types.h>
  43 #include <sys/stat.h>
  44 #include <netinet/in.h>
  45 #include <arpa/inet.h>
  46 #include <sys/socket.h>
  47
  48 #include <fcntl.h>
  49 #include <time.h>
  50 #include <netdb.h>
  51 #include <utmp.h>
  52 #include <unistd.h>
  53 #include <stdio.h>
  54 #include <string.h>
  55 #include "extern.h"
  56
  57 static int fd = -1;
  58
  59 /*
  60  * Modified version of logwtmp that holds wtmp file open
  61  * after first call, for use with ftp (which may chroot
  62  * after login, but before logout).
  63  */
  64 void
  65 ftpd_logwtmp(line, name, host)
  66         char *line, *name, *host;
  67 {
  68         struct utmp ut;
  69         struct stat buf;
  70
  71 #if defined(HAVE_GETNAMEINFO)
  72         if (strlen(host) > UT_HOSTSIZE) {
  73                 struct addrinfo hints, *res;
  74                 int error;
  75                 static char hostbuf[BUFSIZ];
  76
  77                 memset(&hints, 0, sizeof(hints));
  78                 hints.ai_family = PF_UNSPEC;
  79                 error = getaddrinfo(host, NULL, &hints, &res);
  80                 if (error)
  81                         host = "invalid hostname";
  82                 else {
  83                         getnameinfo(res->ai_addr, res->ai_addrlen,
  84                                 hostbuf, sizeof(hostbuf), NULL, 0,
  85                                 NI_NUMERICHOST);
  86                         host = hostbuf;
  87                         if (strlen(host) > UT_HOSTSIZE)
  88                                 host[UT_HOSTSIZE] = '\0';
  89                 }
  90         }
  91 #else
  92         if (strlen(host) > UT_HOSTSIZE) {
  93                 struct hostent *hp = gethostbyname(host);
  94
  95                 if (hp != NULL) {
  96                         struct in_addr in;
  97
  98                         memmove(&in, hp->h_addr, sizeof(in));
  99                         host = inet_ntoa(in);
 100                 } else
 101                         host = "invalid hostname";
 102         }
 103 #endif
 104         if (fd < 0 && (fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) < 0)
 105                 return;
 106         if (fstat(fd, &buf) == 0) {
 107                 (void)strncpy(ut.ut_line, line, sizeof(ut.ut_line));
 108                 (void)strncpy(ut.ut_name, name, sizeof(ut.ut_name));
 109                 (void)strncpy(ut.ut_host, host, sizeof(ut.ut_host));
 110                 (void)time(&ut.ut_time);
 111                 if (write(fd, (char *)&ut, sizeof(struct utmp)) !=
 112                     sizeof(struct utmp))
 113                         (void)ftruncate(fd, buf.st_size);
 114         }
 115 }