106 lines
3.9 KiB
C
106 lines
3.9 KiB
C
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/*-
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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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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/param.h>
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#include <sys/socket.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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#include <stdio.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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static size_t dlen;
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char *s, *end;
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int spn, ok;
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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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memmove(domain, s + 1, strlen(s + 1) + 1);
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else
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domain[0] = '\0';
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dlen = strlen(domain);
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}
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if (domain[0] != '\0') {
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s = fullhost;
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end = s + hostsize + 1;
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for (; (s = memchr(s, '.', end - s)) != NULL; s++)
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if (!strncasecmp(s + 1, domain, dlen)) {
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if (s[dlen + 1] == '\0') {
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*s = '\0'; /* Found - lose the domain */
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break;
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} else if (s[dlen + 1] == ':') { /* $DISPLAY ? */
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ok = dlen + 2;
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spn = strspn(s + ok, "0123456789");
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if (spn > 0 && ok + spn - dlen <= end - s) {
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ok += spn;
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if (s[ok] == '\0') {
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/* host.domain:nn */
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memmove(s, s + dlen + 1, ok - dlen);
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break;
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} else if (s[ok] == '.') {
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ok++;
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spn = strspn(s + ok, "0123456789");
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if (spn > 0 && s[ok + spn] == '\0' &&
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ok + spn - dlen <= end - s) {
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/* host.domain:nn.nn */
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memmove(s, s + dlen + 1, ok + spn - dlen);
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break;
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}
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}
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}
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}
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}
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}
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}
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