1/*-
2 * Copyright (c) 2005-2006 The FreeBSD Project
3 * All rights reserved.
4 *
5 * Author: Victor Cruceru <soc-victor@freebsd.org>
6 *
7 * Redistribution of this software and documentation and use in source and
8 * binary forms, with or without modification, are permitted provided that
9 * the following conditions are met:
10 *
11 * 1. Redistributions of source code or documentation must retain the above
12 *    copyright notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * This C file contains code developed by Poul-Henning Kamp under the
30 * following license:
31 *
32 * FreeBSD: src/sbin/mdconfig/mdconfig.c,v 1.33.2.1 2004/09/14 03:32:21 jmg Exp
33 * ----------------------------------------------------------------------------
34 * "THE BEER-WARE LICENSE" (Revision 42):
35 * <phk@FreeBSD.ORG> wrote this file.  As long as you retain this notice you
36 * can do whatever you want with this stuff. If we meet some day, and you think
37 * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
38 * ----------------------------------------------------------------------------
39 *
40 * $FreeBSD: stable/11/usr.sbin/bsnmpd/modules/snmp_hostres/hostres_snmp.c 310899 2016-12-31 10:28:59Z ngie $
41 */
42
43/*
44 * Host Resources MIB implementation for bsnmpd.
45 */
46
47#include <paths.h>
48#include <stdlib.h>
49#include <string.h>
50#include <syslog.h>
51#include <unistd.h>
52
53#include "hostres_snmp.h"
54#include "hostres_oid.h"
55#include "hostres_tree.h"
56
57/* Internal id got after we'll register this module with the agent */
58static u_int host_registration_id = 0;
59
60/* This our hostres module */
61static struct lmodule *hostres_module;
62
63/* See the generated file hostres_oid.h */
64static const struct asn_oid oid_host = OIDX_host;
65
66/* descriptor to access kernel memory */
67kvm_t *hr_kd;
68
69/*
70 * HOST RESOURCES mib module finalization hook.
71 * Returns 0 on success, < 0 on error
72 */
73static int
74hostres_fini(void)
75{
76
77	if (hr_kd != NULL)
78		(void)kvm_close(hr_kd);
79
80	fini_storage_tbl();
81	fini_fs_tbl();
82	fini_processor_tbl();
83	fini_disk_storage_tbl();
84	fini_device_tbl();
85	fini_partition_tbl();
86	fini_network_tbl();
87	fini_printer_tbl();
88
89	fini_swrun_tbl();
90	fini_swins_tbl();
91
92	fini_scalars();
93
94	if (host_registration_id > 0)
95		or_unregister(host_registration_id);
96
97	HRDBG("done.");
98	return (0);
99}
100
101/*
102 * HOST RESOURCES mib module initialization hook.
103 * Returns 0 on success, < 0 on error
104 */
105static int
106hostres_init(struct lmodule *mod, int argc __unused, char *argv[] __unused)
107{
108
109	hostres_module = mod;
110
111	/*
112	 * NOTE: order of these calls is important here!
113	 */
114	if ((hr_kd = kvm_open(NULL, _PATH_DEVNULL, NULL, O_RDONLY,
115	    "kvm_open")) == NULL) {
116		syslog(LOG_ERR, "kvm_open failed: %m ");
117		return (-1);
118	}
119
120	/*
121	 * The order is relevant here, because some table depend on each other.
122	 */
123	init_device_tbl();
124
125	/* populates partition table too */
126	if (init_disk_storage_tbl()) {
127		hostres_fini();
128		return (-1);
129	}
130	init_processor_tbl();
131	init_printer_tbl();
132
133	/*
134	 * populate storage and FS tables. Must be done after device
135	 * initialisation because the FS refresh code calls into the
136	 * partition refresh code.
137	 */
138	init_storage_tbl();
139
140
141	/* also the hrSWRunPerfTable's support is initialized here */
142	init_swrun_tbl();
143	init_swins_tbl();
144
145	HRDBG("done.");
146
147	return (0);
148}
149
150/*
151 * HOST RESOURCES mib module start operation
152 * returns nothing
153 */
154static void
155hostres_start(void)
156{
157
158	host_registration_id = or_register(&oid_host,
159	    "The MIB module for Host Resource MIB (RFC 2790).",
160	    hostres_module);
161
162	start_device_tbl(hostres_module);
163	start_processor_tbl(hostres_module);
164	start_network_tbl();
165
166	HRDBG("done.");
167}
168
169/* this identifies the HOST RESOURCES mib module */
170const struct snmp_module config = {
171	"This module implements the host resource mib (rfc 2790)",
172	hostres_init,
173	hostres_fini,
174	NULL,			/* idle function, do not use it */
175	NULL,
176	NULL,
177	hostres_start,
178	NULL,		   /* proxy a PDU */
179	hostres_ctree,	  /* see the generated hostres_tree.h */
180	hostres_CTREE_SIZE,     /* see the generated hostres_tree.h */
181	NULL
182};
183
184/**
185 * Make an SNMP DateAndTime from a struct tm. This should be in the library.
186 */
187int
188make_date_time(u_char *str, const struct tm *tm, u_int decisecs)
189{
190
191	str[0] = (u_char)((tm->tm_year + 1900) >> 8);
192	str[1] = (u_char)(tm->tm_year + 1900);
193	str[2] = tm->tm_mon + 1;
194	str[3] = tm->tm_mday;
195	str[4] = tm->tm_hour;
196	str[5] = tm->tm_min;
197	str[6] = tm->tm_sec;
198	str[7] = decisecs;
199	if (tm->tm_gmtoff < 0)
200		str[8] = '-';
201	else
202		str[8] = '+';
203
204	str[9] = (u_char)(labs(tm->tm_gmtoff) / 3600);
205	str[10] = (u_char)((labs(tm->tm_gmtoff) % 3600) / 60);
206
207	return (11);
208}
209