80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2017, Lawrence Livermore National Security, LLC.
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*/
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/systeminfo.h>
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static unsigned long
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get_spl_hostid(void)
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{
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FILE *f;
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unsigned long hostid;
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char *env;
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/*
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* Allow the hostid to be subverted for testing.
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*/
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env = getenv("ZFS_HOSTID");
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if (env)
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return (strtoull(env, NULL, 0));
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f = fopen("/proc/sys/kernel/spl/hostid", "re");
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if (!f)
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return (0);
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if (fscanf(f, "%lx", &hostid) != 1)
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hostid = 0;
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fclose(f);
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return (hostid);
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}
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unsigned long
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get_system_hostid(void)
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{
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unsigned long hostid = get_spl_hostid();
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/*
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* We do not use gethostid(3) because it can return a bogus ID,
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* depending on the libc and /etc/hostid presence,
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* and the kernel and userspace must agree.
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* See comments above hostid_read() in the SPL.
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*/
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if (hostid == 0) {
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int fd = open("/etc/hostid", O_RDONLY | O_CLOEXEC);
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if (fd >= 0) {
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if (read(fd, &hostid, 4) < 0)
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hostid = 0;
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(void) close(fd);
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}
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}
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return (hostid & HOSTID_MASK);
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}
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