84 lines
2.7 KiB
C
84 lines
2.7 KiB
C
/* getdomainname emulation for systems that doesn't have it.
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Copyright (C) 2003, 2006, 2008, 2010-2024 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Simon Josefsson. */
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#include <config.h>
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/* Specification. */
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#include <unistd.h>
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#include <limits.h>
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#include <string.h>
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#include <errno.h>
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#if HAVE_SYSINFO && HAVE_SYS_SYSTEMINFO_H /* IRIX, OSF/1, Solaris */
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# include <sys/systeminfo.h>
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#endif
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/* Return the NIS domain name of the machine.
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WARNING! The NIS domain name is unrelated to the fully qualified host name
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of the machine. It is also unrelated to email addresses.
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WARNING! The NIS domain name is usually the empty string or "(none)" when
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not using NIS.
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Put up to LEN bytes of the NIS domain name into NAME.
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Null terminate it if the name is shorter than LEN.
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If the NIS domain name is longer than LEN, set errno = EINVAL and return -1.
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Return 0 if successful, otherwise set errno and return -1. */
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int
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getdomainname (char *name, size_t len)
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#undef getdomainname
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{
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#if HAVE_GETDOMAINNAME /* Mac OS X, FreeBSD, AIX, IRIX, OSF/1 */
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extern int getdomainname (char *, int);
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if (len > INT_MAX)
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len = INT_MAX;
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return getdomainname (name, (int) len);
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#elif HAVE_SYSINFO && HAVE_SYS_SYSTEMINFO_H && defined SI_SRPC_DOMAIN
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/* Solaris */
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int ret;
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/* The third argument is a 'long', but the return value must fit in an
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'int', therefore it's better to avoid arguments > INT_MAX. */
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ret = sysinfo (SI_SRPC_DOMAIN, name, len > INT_MAX ? INT_MAX : len);
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if (ret < 0)
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/* errno is set here. */
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return -1;
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if (ret > len)
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{
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errno = EINVAL;
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return -1;
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}
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return 0;
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#else /* HP-UX, Cygwin, mingw */
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const char *result = ""; /* Hardcode your domain name if you want. */
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size_t result_len = strlen (result);
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if (result_len > len)
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{
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errno = EINVAL;
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return -1;
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}
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memcpy (name, result, result_len);
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if (result_len < len)
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name[result_len] = '\0';
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return 0;
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#endif
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}
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