hostres_snmp.c revision 154133 
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: head/usr.sbin/bsnmpd/modules/snmp_hostres/hostres_snmp.c 154133 2006-01-09 12:33:45Z harti $
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#include <utmp.h>
53
54#include "hostres_snmp.h"
55#include "hostres_oid.h"
56#include "hostres_tree.h"
57
58/* Internal id got after we'll register this module with the agent */
59static u_int host_registration_id = 0;
60
61/* This our hostres module */
62static struct lmodule *hostres_module;
63
64/* See the generated file hostres_oid.h */
65static const struct asn_oid oid_host = OIDX_host;
66
67/* descriptor to access kernel memory */
68kvm_t *hr_kd;
69
70/*
71 * HOST RESOURCES mib module finalization hook.
72 * Returns 0 on success, < 0 on error
73 */
74static int
75hostres_fini(void)
76{
77
78	if (hr_kd != NULL)
79		(void)kvm_close(hr_kd);
80
81	fini_storage_tbl();
82	fini_fs_tbl();
83	fini_processor_tbl();
84	fini_disk_storage_tbl();
85	fini_device_tbl();
86	fini_partition_tbl();
87	fini_network_tbl();
88	fini_printer_tbl();
89
90	fini_swrun_tbl();
91	fini_swins_tbl();
92
93	fini_scalars();
94
95	if (host_registration_id > 0)
96		or_unregister(host_registration_id);
97
98	HRDBG("done.");
99	return (0);
100}
101
102/*
103 * HOST RESOURCES mib module initialization hook.
104 * Returns 0 on success, < 0 on error
105 */
106static int
107hostres_init(struct lmodule *mod, int argc __unused, char *argv[] __unused)
108{
109
110	hostres_module = mod;
111
112	/*
113	 * NOTE: order of these calls is important here!
114	 */
115	if ((hr_kd = kvm_open(NULL, _PATH_DEVNULL, NULL, O_RDONLY,
116	    "kvm_open")) == NULL) {
117		syslog(LOG_ERR, "kvm_open failed: %m ");
118		return (-1);
119	}
120
121	/*
122	 * The order is relevant here, because some table depend on each other.
123	 */
124	init_device_tbl();
125
126	/* populates partition table too */
127	if (init_disk_storage_tbl()) {
128		hostres_fini();
129		return (-1);
130	}
131	init_processor_tbl();
132	init_printer_tbl();
133
134	/*
135	 * populate storage and FS tables. Must be done after device
136	 * initialisation because the FS refresh code calls into the
137	 * partition refresh code.
138	 */
139	init_storage_tbl();
140
141
142	/* also the hrSWRunPerfTable's support is initialized here */
143	init_swrun_tbl();
144	init_swins_tbl();
145
146	HRDBG("done.");
147
148	return (0);
149}
150
151/*
152 * HOST RESOURCES mib module start operation
153 * returns nothing
154 */
155static void
156hostres_start(void)
157{
158
159	host_registration_id = or_register(&oid_host,
160	    "The MIB module for Host Resource MIB (RFC 2790).",
161	    hostres_module);
162
163	start_device_tbl(hostres_module);
164	start_processor_tbl(hostres_module);
165	start_network_tbl();
166
167        HRDBG("done.");
168}
169
170/* this identifies the HOST RESOURCES mib module */
171const struct snmp_module config = {
172	"This module implements the host resource mib (rfc 2790)",
173	hostres_init,
174	hostres_fini,
175	NULL,			/* idle function, do not use it */
176	NULL,
177	NULL,
178	hostres_start,
179	NULL,                   /* proxy a PDU */
180	hostres_ctree,          /* see the generated hostres_tree.h */
181	hostres_CTREE_SIZE,     /* see the generated hostres_tree.h */
182	NULL
183};
184
185/**
186 * Make an SNMP DateAndTime from a struct tm. This should be in the library.
187 */
188int
189make_date_time(u_char *str, const struct tm *tm, u_int decisecs)
190{
191
192	str[0] = (u_char)((tm->tm_year + 1900) >> 8);
193	str[1] = (u_char)(tm->tm_year + 1900);
194	str[2] = tm->tm_mon + 1;
195	str[3] = tm->tm_mday;
196	str[4] = tm->tm_hour;
197	str[5] = tm->tm_min;
198	str[6] = tm->tm_sec;
199	str[7] = decisecs;
200	if (tm->tm_gmtoff < 0)
201		str[8] = '-';
202	else
203		str[8] = '+';
204
205	str[9] = (u_char)(abs(tm->tm_gmtoff) / 3600);
206	str[10] = (u_char)((abs(tm->tm_gmtoff) % 3600) / 60);
207
208	return (11);
209}
210