1/*-
2 * SPDX-License-Identifier: (BSD-2-Clause AND Beerware)
3 *
4 * Copyright (c) 2005-2006 The FreeBSD Project
5 * All rights reserved.
6 *
7 * Author: Victor Cruceru <soc-victor@freebsd.org>
8 *
9 * Redistribution of this software and documentation and use in source and
10 * binary forms, with or without modification, are permitted provided that
11 * the following conditions are met:
12 *
13 * 1. Redistributions of source code or documentation must retain the above
14 *    copyright notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * This C file contains code developed by Poul-Henning Kamp under the
32 * following license:
33 *
34 * FreeBSD: src/sbin/mdconfig/mdconfig.c,v 1.33.2.1 2004/09/14 03:32:21 jmg Exp
35 * ----------------------------------------------------------------------------
36 * "THE BEER-WARE LICENSE" (Revision 42):
37 * <phk@FreeBSD.ORG> wrote this file.  As long as you retain this notice you
38 * can do whatever you want with this stuff. If we meet some day, and you think
39 * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
40 * ----------------------------------------------------------------------------
41 *
42 * $FreeBSD$
43 */
44
45/*
46 * Host Resources MIB implementation for bsnmpd.
47 */
48
49#include <paths.h>
50#include <stdlib.h>
51#include <string.h>
52#include <syslog.h>
53#include <unistd.h>
54
55#include "hostres_snmp.h"
56#include "hostres_oid.h"
57#include "hostres_tree.h"
58
59/* Internal id got after we'll register this module with the agent */
60static u_int host_registration_id = 0;
61
62/* This our hostres module */
63static struct lmodule *hostres_module;
64
65/* See the generated file hostres_oid.h */
66static const struct asn_oid oid_host = OIDX_host;
67
68/* descriptor to access kernel memory */
69kvm_t *hr_kd;
70
71/*
72 * HOST RESOURCES mib module finalization hook.
73 * Returns 0 on success, < 0 on error
74 */
75static int
76hostres_fini(void)
77{
78
79	if (hr_kd != NULL)
80		(void)kvm_close(hr_kd);
81
82	fini_storage_tbl();
83	fini_fs_tbl();
84	fini_processor_tbl();
85	fini_disk_storage_tbl();
86	fini_device_tbl();
87	fini_partition_tbl();
88	fini_network_tbl();
89	fini_printer_tbl();
90
91	fini_swrun_tbl();
92	fini_swins_tbl();
93
94	fini_scalars();
95
96	if (host_registration_id > 0)
97		or_unregister(host_registration_id);
98
99	HRDBG("done.");
100	return (0);
101}
102
103/*
104 * HOST RESOURCES mib module initialization hook.
105 * Returns 0 on success, < 0 on error
106 */
107static int
108hostres_init(struct lmodule *mod, int argc __unused, char *argv[] __unused)
109{
110
111	hostres_module = mod;
112
113	/*
114	 * NOTE: order of these calls is important here!
115	 */
116	if ((hr_kd = kvm_open(NULL, _PATH_DEVNULL, NULL, O_RDONLY,
117	    "kvm_open")) == NULL) {
118		syslog(LOG_ERR, "kvm_open failed: %m ");
119		return (-1);
120	}
121
122	/*
123	 * The order is relevant here, because some table depend on each other.
124	 */
125	init_device_tbl();
126
127	/* populates partition table too */
128	if (init_disk_storage_tbl()) {
129		hostres_fini();
130		return (-1);
131	}
132	init_processor_tbl();
133	init_printer_tbl();
134
135	/*
136	 * populate storage and FS tables. Must be done after device
137	 * initialisation because the FS refresh code calls into the
138	 * partition refresh code.
139	 */
140	init_storage_tbl();
141
142
143	/* also the hrSWRunPerfTable's support is initialized here */
144	init_swrun_tbl();
145	init_swins_tbl();
146
147	HRDBG("done.");
148
149	return (0);
150}
151
152/*
153 * HOST RESOURCES mib module start operation
154 * returns nothing
155 */
156static void
157hostres_start(void)
158{
159
160	host_registration_id = or_register(&oid_host,
161	    "The MIB module for Host Resource MIB (RFC 2790).",
162	    hostres_module);
163
164	start_device_tbl(hostres_module);
165	start_processor_tbl(hostres_module);
166	start_network_tbl();
167
168	HRDBG("done.");
169}
170
171/* this identifies the HOST RESOURCES mib module */
172const struct snmp_module config = {
173	"This module implements the host resource mib (rfc 2790)",
174	hostres_init,
175	hostres_fini,
176	NULL,			/* idle function, do not use it */
177	NULL,
178	NULL,
179	hostres_start,
180	NULL,		   /* proxy a PDU */
181	hostres_ctree,	  /* see the generated hostres_tree.h */
182	hostres_CTREE_SIZE,     /* see the generated hostres_tree.h */
183	NULL
184};
185
186/**
187 * Make an SNMP DateAndTime from a struct tm. This should be in the library.
188 */
189int
190make_date_time(u_char *str, const struct tm *tm, u_int decisecs)
191{
192
193	str[0] = (u_char)((tm->tm_year + 1900) >> 8);
194	str[1] = (u_char)(tm->tm_year + 1900);
195	str[2] = tm->tm_mon + 1;
196	str[3] = tm->tm_mday;
197	str[4] = tm->tm_hour;
198	str[5] = tm->tm_min;
199	str[6] = tm->tm_sec;
200	str[7] = decisecs;
201	if (tm->tm_gmtoff < 0)
202		str[8] = '-';
203	else
204		str[8] = '+';
205
206	str[9] = (u_char)(labs(tm->tm_gmtoff) / 3600);
207	str[10] = (u_char)((labs(tm->tm_gmtoff) % 3600) / 60);
208
209	return (11);
210}
211