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
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 */
58 static u_int host_registration_id = 0;
59
60 /* This our hostres module */
61 static struct lmodule *hostres_module;
62
63 /* See the generated file hostres_oid.h */
64 static const struct asn_oid oid_host = OIDX_host;
65
66 /* descriptor to access kernel memory */
67 kvm_t *hr_kd;
68
69 /*
70 * HOST RESOURCES mib module finalization hook.
71 * Returns 0 on success, < 0 on error
72 */
73 static int
hostres_fini(void)74 hostres_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 */
105 static int
hostres_init(struct lmodule * mod,int argc __unused,char * argv[]__unused)106 hostres_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 */
154 static void
hostres_start(void)155 hostres_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 */
170 const 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 */
187 int
make_date_time(u_char * str,const struct tm * tm,u_int decisecs)188 make_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