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
|
/*
** Zabbix
** Copyright (C) 2001-2021 Zabbix SIA
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program 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 General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
**/
#include "common.h"
#include "listener.h"
#include "comms.h"
#include "cfg.h"
#include "zbxconf.h"
#include "stats.h"
#include "sysinfo.h"
#include "log.h"
extern unsigned char program_type;
extern ZBX_THREAD_LOCAL unsigned char process_type;
extern ZBX_THREAD_LOCAL int server_num, process_num;
#if defined(ZABBIX_SERVICE)
# include "service.h"
#elif defined(ZABBIX_DAEMON)
# include "daemon.h"
#endif
#include "zbxcrypto.h"
#include "../libs/zbxcrypto/tls_tcp_active.h"
#ifndef _WINDOWS
static volatile sig_atomic_t need_update_userparam;
#endif
static void process_listener(zbx_socket_t *s)
{
AGENT_RESULT result;
char **value = NULL;
int ret;
if (SUCCEED == (ret = zbx_tcp_recv_to(s, CONFIG_TIMEOUT)))
{
zbx_rtrim(s->buffer, "\r\n");
zabbix_log(LOG_LEVEL_DEBUG, "Requested [%s]", s->buffer);
init_result(&result);
if (SUCCEED == process(s->buffer, PROCESS_WITH_ALIAS, &result))
{
if (NULL != (value = GET_TEXT_RESULT(&result)))
{
zabbix_log(LOG_LEVEL_DEBUG, "Sending back [%s]", *value);
ret = zbx_tcp_send_to(s, *value, CONFIG_TIMEOUT);
}
}
else
{
value = GET_MSG_RESULT(&result);
if (NULL != value)
{
static char *buffer = NULL;
static size_t buffer_alloc = 256;
size_t buffer_offset = 0;
zabbix_log(LOG_LEVEL_DEBUG, "Sending back [" ZBX_NOTSUPPORTED ": %s]", *value);
if (NULL == buffer)
buffer = (char *)zbx_malloc(buffer, buffer_alloc);
zbx_strncpy_alloc(&buffer, &buffer_alloc, &buffer_offset,
ZBX_NOTSUPPORTED, ZBX_CONST_STRLEN(ZBX_NOTSUPPORTED));
buffer_offset++;
zbx_strcpy_alloc(&buffer, &buffer_alloc, &buffer_offset, *value);
ret = zbx_tcp_send_bytes_to(s, buffer, buffer_offset, CONFIG_TIMEOUT);
}
else
{
zabbix_log(LOG_LEVEL_DEBUG, "Sending back [" ZBX_NOTSUPPORTED "]");
ret = zbx_tcp_send_to(s, ZBX_NOTSUPPORTED, CONFIG_TIMEOUT);
}
}
free_result(&result);
}
if (FAIL == ret)
zabbix_log(LOG_LEVEL_DEBUG, "Process listener error: %s", zbx_socket_strerror());
}
#ifndef _WINDOWS
static void zbx_listener_sigusr_handler(int flags)
{
if (ZBX_RTC_USER_PARAMETERS_RELOAD == ZBX_RTC_GET_MSG(flags))
need_update_userparam = 1;
}
#endif
ZBX_THREAD_ENTRY(listener_thread, args)
{
#if defined(HAVE_GNUTLS) || defined(HAVE_OPENSSL)
char *msg = NULL;
#endif
int ret;
zbx_socket_t s;
assert(args);
assert(((zbx_thread_args_t *)args)->args);
process_type = ((zbx_thread_args_t *)args)->process_type;
server_num = ((zbx_thread_args_t *)args)->server_num;
process_num = ((zbx_thread_args_t *)args)->process_num;
zabbix_log(LOG_LEVEL_INFORMATION, "%s #%d started [%s #%d]", get_program_type_string(program_type),
server_num, get_process_type_string(process_type), process_num);
memcpy(&s, (zbx_socket_t *)((zbx_thread_args_t *)args)->args, sizeof(zbx_socket_t));
zbx_free(args);
#if defined(HAVE_GNUTLS) || defined(HAVE_OPENSSL)
zbx_tls_init_child();
#endif
#ifndef _WINDOWS
zbx_set_sigusr_handler(zbx_listener_sigusr_handler);
#endif
while (ZBX_IS_RUNNING())
{
#ifndef _WINDOWS
if (1 == need_update_userparam)
{
zbx_setproctitle("listener #%d [reloading user parameters]", process_num);
reload_user_parameters(process_type, process_num);
need_update_userparam = 0;
}
#endif
zbx_setproctitle("listener #%d [waiting for connection]", process_num);
ret = zbx_tcp_accept(&s, configured_tls_accept_modes);
zbx_update_env(zbx_time());
if (SUCCEED == ret)
{
zbx_setproctitle("listener #%d [processing request]", process_num);
if ('\0' != *CONFIG_HOSTS_ALLOWED &&
SUCCEED == (ret = zbx_tcp_check_allowed_peers(&s, CONFIG_HOSTS_ALLOWED)))
{
#if defined(HAVE_GNUTLS) || defined(HAVE_OPENSSL)
if (ZBX_TCP_SEC_TLS_CERT != s.connection_type ||
SUCCEED == (ret = zbx_check_server_issuer_subject(&s, &msg)))
#endif
{
process_listener(&s);
}
}
zbx_tcp_unaccept(&s);
}
if (SUCCEED == ret || EINTR == zbx_socket_last_error())
continue;
#if defined(HAVE_GNUTLS) || defined(HAVE_OPENSSL)
if (NULL != msg)
{
zabbix_log(LOG_LEVEL_WARNING, "failed to accept an incoming connection: %s", msg);
zbx_free(msg);
}
else
#endif
{
zabbix_log(LOG_LEVEL_WARNING, "failed to accept an incoming connection: %s",
zbx_socket_strerror());
}
if (ZBX_IS_RUNNING())
zbx_sleep(1);
}
#ifdef _WINDOWS
ZBX_DO_EXIT();
zbx_thread_exit(EXIT_SUCCESS);
#else
zbx_setproctitle("%s #%d [terminated]", get_process_type_string(process_type), process_num);
while (1)
zbx_sleep(SEC_PER_MIN);
#endif
}
|
