1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
/* vim:ts=8:sts=8:sw=4:noai:noexpandtab
*
* SNMP agent, single session.
*
* Copyright (c) 2006-2010 Miru Limited.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include <errno.h>
#include <impl/i18n.h>
#include <impl/framework.h>
#include "pgm/snmp.h"
#include "impl/pgmMIB.h"
/* globals */
bool pgm_agentx_subagent = TRUE;
char* pgm_agentx_socket = NULL;
char* pgm_snmp_appname = "PGM";
/* locals */
#ifndef _WIN32
static pthread_t snmp_thread;
static void* snmp_routine (void*);
#else
static HANDLE snmp_thread;
static unsigned __stdcall snmp_routine (void*);
#endif
static pgm_notify_t snmp_notify = PGM_NOTIFY_INIT;
static volatile uint32_t snmp_ref_count = 0;
/* Calling application needs to redirect SNMP logging before prior to this
* function.
*/
bool
pgm_snmp_init (
pgm_error_t** error
)
{
if (pgm_atomic_exchange_and_add32 (&snmp_ref_count, 1) > 0)
return TRUE;
if (pgm_agentx_subagent)
{
pgm_minor (_("Configuring as SNMP AgentX sub-agent."));
if (pgm_agentx_socket)
{
pgm_minor (_("Using AgentX socket %s."), pgm_agentx_socket);
netsnmp_ds_set_string (NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_X_SOCKET,
pgm_agentx_socket);
}
netsnmp_ds_set_boolean (NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_ROLE,
TRUE);
}
pgm_minor (_("Initialising SNMP agent."));
if (0 != init_agent (pgm_snmp_appname)) {
pgm_set_error (error,
PGM_ERROR_DOMAIN_SNMP,
PGM_ERROR_FAILED,
_("Initialise SNMP agent: see SNMP log for further details."));
goto err_cleanup;
}
if (!pgm_mib_init (error)) {
goto err_cleanup;
}
/* read config and parse mib */
pgm_minor (_("Initialising SNMP."));
init_snmp (pgm_snmp_appname);
if (!pgm_agentx_subagent)
{
pgm_minor (_("Connecting to SNMP master agent."));
if (0 != init_master_agent ()) {
pgm_set_error (error,
PGM_ERROR_DOMAIN_SNMP,
PGM_ERROR_FAILED,
_("Initialise SNMP master agent: see SNMP log for further details."));
snmp_shutdown (pgm_snmp_appname);
goto err_cleanup;
}
}
/* create notification channel */
if (0 != pgm_notify_init (&snmp_notify)) {
pgm_set_error (error,
PGM_ERROR_DOMAIN_SNMP,
pgm_error_from_errno (errno),
_("Creating SNMP notification channel: %s"),
strerror (errno));
snmp_shutdown (pgm_snmp_appname);
goto err_cleanup;
}
/* spawn thread to handle SNMP requests */
#ifndef _WIN32
const int status = pthread_create (&snmp_thread, NULL, &snmp_routine, NULL);
if (0 != status) {
pgm_set_error (error,
PGM_ERROR_DOMAIN_SNMP,
pgm_error_from_errno (errno),
_("Creating SNMP thread: %s"),
strerror (errno));
snmp_shutdown (pgm_snmp_appname);
goto err_cleanup;
}
#else
snmp_thread = (HANDLE)_beginthreadex (NULL, 0, &snmp_routine, NULL, 0, NULL);
const int save_errno = errno;
if (0 == snmp_thread) {
pgm_set_error (error,
PGM_ERROR_DOMAIN_SNMP,
pgm_error_from_errno (save_errno),
_("Creating SNMP thread: %s"),
strerror (save_errno));
snmp_shutdown (pgm_snmp_appname);
goto err_cleanup;
}
#endif /* _WIN32 */
return TRUE;
err_cleanup:
if (pgm_notify_is_valid (&snmp_notify)) {
pgm_notify_destroy (&snmp_notify);
}
pgm_atomic_dec32 (&snmp_ref_count);
return FALSE;
}
/* Terminate SNMP thread and free resources.
*/
bool
pgm_snmp_shutdown (void)
{
pgm_return_val_if_fail (pgm_atomic_read32 (&snmp_ref_count) > 0, FALSE);
if (pgm_atomic_exchange_and_add32 (&snmp_ref_count, (uint32_t)-1) != 1)
return TRUE;
pgm_notify_send (&snmp_notify);
#ifndef _WIN32
pthread_join (snmp_thread, NULL);
#else
CloseHandle (snmp_thread);
#endif
pgm_notify_destroy (&snmp_notify);
snmp_shutdown (pgm_snmp_appname);
return TRUE;
}
/* Thread routine for processing SNMP requests
*/
static
#ifndef _WIN32
void*
#else
unsigned
__stdcall
#endif
snmp_routine (
PGM_GNUC_UNUSED void* arg
)
{
const int notify_fd = pgm_notify_get_fd (&snmp_notify);
for (;;)
{
int fds = 0, block = 1;
fd_set fdset;
struct timeval timeout;
FD_ZERO(&fdset);
snmp_select_info (&fds, &fdset, &timeout, &block);
FD_SET(notify_fd, &fdset);
if (notify_fd+1 > fds)
fds = notify_fd+1;
fds = select (fds, &fdset, NULL, NULL, block ? NULL : &timeout);
if (FD_ISSET(notify_fd, &fdset))
break;
if (fds)
snmp_read (&fdset);
else
snmp_timeout();
}
/* cleanup */
#ifndef _WIN32
return NULL;
#else
_endthread();
return 0;
#endif /* WIN32 */
}
/* eof */
|
