5b3f0a74e1
Use bcopy() instead of strcpy() to handle potentially overlapping regions. Un-obscure/complicate some code.
129 lines
3.9 KiB
C
129 lines
3.9 KiB
C
/*-
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)logwtmp.c 8.1 (Berkeley) 6/4/93";
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#else
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static const char rcsid[] =
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"$Id: logwtmp.c,v 1.8 1998/10/09 11:24:19 jkh Exp $";
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <libutil.h>
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#include <netdb.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <utmp.h>
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void
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trimdomain( char * fullhost, int hostsize )
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{
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static char domain[MAXHOSTNAMELEN];
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static int first = 1;
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char *s;
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if (first) {
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first = 0;
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if (gethostname(domain, sizeof(domain) - 1) == 0 &&
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(s = strchr(domain, '.')))
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bcopy(s + 1, domain, strlen(s + 1) + 1);
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else
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domain[0] = 0;
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}
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if (domain[0]) {
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s = fullhost;
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while ((fullhost = strchr(fullhost, '.'))) {
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if (!strcasecmp(fullhost + 1, domain)) {
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if ( fullhost - s < hostsize ) {
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*fullhost = '\0'; /* hit it and acceptable size*/
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}
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break;
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} else {
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fullhost++;
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}
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}
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}
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}
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void
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logwtmp(line, name, host)
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const char *line;
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const char *name;
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const char *host;
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{
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struct utmp ut;
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struct stat buf;
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char fullhost[MAXHOSTNAMELEN];
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int fd;
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strncpy(fullhost, host, sizeof(fullhost) - 1);
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fullhost[sizeof(fullhost) - 1] = '\0';
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trimdomain(fullhost, UT_HOSTSIZE);
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host = fullhost;
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if (strlen(host) > UT_HOSTSIZE) {
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struct hostent *hp = gethostbyname(host);
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if (hp != NULL) {
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struct in_addr in;
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memmove(&in, hp->h_addr, sizeof(in));
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host = inet_ntoa(in);
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} else
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host = "invalid hostname";
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}
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if ((fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) < 0)
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return;
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if (fstat(fd, &buf) == 0) {
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(void) strncpy(ut.ut_line, line, sizeof(ut.ut_line));
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(void) strncpy(ut.ut_name, name, sizeof(ut.ut_name));
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(void) strncpy(ut.ut_host, host, sizeof(ut.ut_host));
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(void) time(&ut.ut_time);
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if (write(fd, (char *)&ut, sizeof(struct utmp)) !=
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sizeof(struct utmp))
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(void) ftruncate(fd, buf.st_size);
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}
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(void) close(fd);
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}
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