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117 lines
3.4 KiB
C
117 lines
3.4 KiB
C
/*-
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* Copyright (c) 2001 Brian Somers <brian@Awfulhak.org>
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* Based on original work by Atsushi Murai <amurai@FreeBSD.org>
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <libutil.h>
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#include <string.h>
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#include <unistd.h>
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void trimdomain(char *_fullhost, size_t _hostsize);
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static int isDISP(const char *);
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/*-
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* Trim the current domain name from fullhost, but only if the result
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* is less than or equal to hostsize in length.
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*
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* This function understands $DISPLAY type fullhosts.
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*
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* For example:
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*
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* trimdomain("abcde.my.domain", 5) -> "abcde"
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* trimdomain("abcde.my.domain", 4) -> "abcde.my.domain"
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* trimdomain("abcde.my.domain:0.0", 9) -> "abcde:0.0"
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* trimdomain("abcde.my.domain:0.0", 8) -> "abcde.my.domain:0.0"
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*/
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void
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trimdomain(char *fullhost, size_t hostsize)
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{
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static size_t dlen;
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static int first = 1;
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static char domain[MAXHOSTNAMELEN];
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char *end, *s;
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size_t len;
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if (first) {
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/* XXX: Should we assume that our domain is this persistent ? */
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first = 0;
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if (gethostname(domain, sizeof(domain) - 1) == 0 &&
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(s = strchr(domain, '.')) != NULL)
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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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return;
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s = fullhost;
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end = (char *)((uintptr_t)s + hostsize + 1);
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if ((s = memchr(s, '.', (size_t)(end - s))) != NULL) {
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if (strncasecmp(s + 1, domain, dlen) == 0) {
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if (s[dlen + 1] == '\0') {
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/* Found -- lose the domain. */
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*s = '\0';
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} else if (s[dlen + 1] == ':' &&
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isDISP(s + dlen + 2) &&
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(len = strlen(s + dlen + 1)) < (size_t)(end - s)) {
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/* Found -- shuffle the DISPLAY back. */
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memmove(s, s + dlen + 1, len + 1);
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}
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}
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}
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}
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/*
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* Is the given string NN or NN.NN where ``NN'' is an all-numeric string ?
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*/
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static int
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isDISP(const char *disp)
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{
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size_t w;
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int res;
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w = strspn(disp, "0123456789");
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res = 0;
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if (w > 0) {
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if (disp[w] == '\0')
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res = 1; /* NN */
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else if (disp[w] == '.') {
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disp += w + 1;
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w = strspn(disp, "0123456789");
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if (w > 0 && disp[w] == '\0')
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res = 1; /* NN.NN */
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}
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}
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return (res);
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}
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