1 /*
2 ** Zabbix
3 ** Copyright (C) 2001-2021 Zabbix SIA
4 **
5 ** This program is free software; you can redistribute it and/or modify
6 ** it under the terms of the GNU General Public License as published by
7 ** the Free Software Foundation; either version 2 of the License, or
8 ** (at your option) any later version.
9 **
10 ** This program is distributed in the hope that it will be useful,
11 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
12 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 ** GNU General Public License for more details.
14 **
15 ** You should have received a copy of the GNU General Public License
16 ** along with this program; if not, write to the Free Software
17 ** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
18 **/
19
20 #include "common.h"
21 #include "sysinfo.h"
22 #include "zbxjson.h"
23 #include "log.h"
24
get_fs_size_stat(const char * fs,zbx_uint64_t * total,zbx_uint64_t * free,zbx_uint64_t * used,double * pfree,double * pused,char ** error)25 static int get_fs_size_stat(const char *fs, zbx_uint64_t *total, zbx_uint64_t *free,
26 zbx_uint64_t *used, double *pfree, double *pused, char **error)
27 {
28 #ifdef HAVE_SYS_STATVFS_H
29 # define ZBX_STATFS statvfs
30 # define ZBX_BSIZE f_frsize
31 #else
32 # define ZBX_STATFS statfs
33 # define ZBX_BSIZE f_bsize
34 #endif
35 struct ZBX_STATFS s;
36
37 if (NULL == fs || '\0' == *fs)
38 {
39 *error = zbx_strdup(NULL, "Filesystem name cannot be empty.");
40 return SYSINFO_RET_FAIL;
41 }
42
43 if (0 != ZBX_STATFS(fs, &s))
44 {
45 *error = zbx_dsprintf(NULL, "Cannot obtain filesystem information: %s", zbx_strerror(errno));
46 return SYSINFO_RET_FAIL;
47 }
48
49 /* Available space could be negative (top bit set) if we hit disk space */
50 /* reserved for non-privileged users. Treat it as 0. */
51 if (0 != ZBX_IS_TOP_BIT_SET(s.f_bavail))
52 s.f_bavail = 0;
53
54 if (NULL != total)
55 *total = (zbx_uint64_t)s.f_blocks * s.ZBX_BSIZE;
56
57 if (NULL != free)
58 *free = (zbx_uint64_t)s.f_bavail * s.ZBX_BSIZE;
59
60 if (NULL != used)
61 *used = (zbx_uint64_t)(s.f_blocks - s.f_bfree) * s.ZBX_BSIZE;
62
63 if (NULL != pfree)
64 {
65 if (0 != s.f_blocks - s.f_bfree + s.f_bavail)
66 *pfree = (double)(100.0 * s.f_bavail) / (s.f_blocks - s.f_bfree + s.f_bavail);
67 else
68 *pfree = 0;
69 }
70
71 if (NULL != pused)
72 {
73 if (0 != s.f_blocks - s.f_bfree + s.f_bavail)
74 *pused = 100.0 - (double)(100.0 * s.f_bavail) / (s.f_blocks - s.f_bfree + s.f_bavail);
75 else
76 *pused = 0;
77 }
78
79 return SYSINFO_RET_OK;
80 }
81
vfs_fs_size(AGENT_REQUEST * request,AGENT_RESULT * result)82 static int vfs_fs_size(AGENT_REQUEST *request, AGENT_RESULT *result)
83 {
84 char *fsname, *mode, *error;
85 zbx_uint64_t total, free, used;
86 double pfree, pused;
87
88 if (2 < request->nparam)
89 {
90 SET_MSG_RESULT(result, zbx_strdup(NULL, "Too many parameters."));
91 return SYSINFO_RET_FAIL;
92 }
93
94 fsname = get_rparam(request, 0);
95 mode = get_rparam(request, 1);
96
97 if (SYSINFO_RET_OK != get_fs_size_stat(fsname, &total, &free, &used, &pfree, &pused, &error))
98 {
99 SET_MSG_RESULT(result, error);
100 return SYSINFO_RET_FAIL;
101 }
102
103 if (NULL == mode || '\0' == *mode || 0 == strcmp(mode, "total")) /* default parameter */
104 SET_UI64_RESULT(result, total);
105 else if (0 == strcmp(mode, "free"))
106 SET_UI64_RESULT(result, free);
107 else if (0 == strcmp(mode, "used"))
108 SET_UI64_RESULT(result, used);
109 else if (0 == strcmp(mode, "pfree"))
110 SET_DBL_RESULT(result, pfree);
111 else if (0 == strcmp(mode, "pused"))
112 SET_DBL_RESULT(result, pused);
113 else
114 {
115 SET_MSG_RESULT(result, zbx_strdup(NULL, "Invalid second parameter."));
116 return SYSINFO_RET_FAIL;
117 }
118
119 return SYSINFO_RET_OK;
120 }
121
VFS_FS_SIZE(AGENT_REQUEST * request,AGENT_RESULT * result)122 int VFS_FS_SIZE(AGENT_REQUEST *request, AGENT_RESULT *result)
123 {
124 return zbx_execute_threaded_metric(vfs_fs_size, request, result);
125 }
126
VFS_FS_DISCOVERY(AGENT_REQUEST * request,AGENT_RESULT * result)127 int VFS_FS_DISCOVERY(AGENT_REQUEST *request, AGENT_RESULT *result)
128 {
129 char line[MAX_STRING_LEN], *p, *mpoint, *mtype;
130 FILE *f;
131 struct zbx_json j;
132
133 if (NULL == (f = fopen("/proc/mounts", "r")))
134 {
135 SET_MSG_RESULT(result, zbx_dsprintf(NULL, "Cannot open /proc/mounts: %s", zbx_strerror(errno)));
136 return SYSINFO_RET_FAIL;
137 }
138
139 zbx_json_init(&j, ZBX_JSON_STAT_BUF_LEN);
140
141 zbx_json_addarray(&j, ZBX_PROTO_TAG_DATA);
142
143 while (NULL != fgets(line, sizeof(line), f))
144 {
145 if (NULL == (p = strchr(line, ' ')))
146 continue;
147
148 mpoint = ++p;
149
150 if (NULL == (p = strchr(mpoint, ' ')))
151 continue;
152
153 *p = '\0';
154
155 mtype = ++p;
156
157 if (NULL == (p = strchr(mtype, ' ')))
158 continue;
159
160 *p = '\0';
161
162 zbx_json_addobject(&j, NULL);
163 zbx_json_addstring(&j, "{#FSNAME}", mpoint, ZBX_JSON_TYPE_STRING);
164 zbx_json_addstring(&j, "{#FSTYPE}", mtype, ZBX_JSON_TYPE_STRING);
165 zbx_json_close(&j);
166 }
167
168 zbx_fclose(f);
169
170 zbx_json_close(&j);
171
172 SET_STR_RESULT(result, zbx_strdup(NULL, j.buffer));
173
174 zbx_json_free(&j);
175
176 return SYSINFO_RET_OK;
177 }
178