1 /*
2 Copyright 2020 Northern.tech AS
3
4 This file is part of CFEngine 3 - written and maintained by Northern.tech AS.
5
6 This program is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; version 3.
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
18
19 To the extent this program is licensed as part of the Enterprise
20 versions of CFEngine, the applicable Commercial Open Source License
21 (COSL) may apply to this file if you as a licensee so wish it. See
22 included file COSL.txt.
23 */
24
25
26 #include <cf3.defs.h>
27
28 #include <file_lib.h>
29 #include <monitoring.h>
30 #include <probes.h>
31 #include <proc_keyvalue.h>
32
33
34 /************************************************************************/
35 /* Generic "Key: Numeric Value" parser */
36 /************************************************************************/
37
38 /* Getting data from /proc/meminfo - All values are in bytes */
39
40 typedef struct
41 {
42 off_t total;
43 off_t free;
44 off_t cached;
45 off_t swap;
46 off_t free_swap;
47 } MemoryInfo;
48
49 #define KB 1024
50
AcceptMemoryField(const char * field,off_t value,void * param)51 static bool AcceptMemoryField(const char *field, off_t value, void *param)
52 {
53 MemoryInfo *info = param;
54
55 value *= KB;
56
57 if (!strcmp(field, "MemTotal"))
58 {
59 info->total = value;
60 }
61 else if (!strcmp(field, "MemFree"))
62 {
63 info->free = value;
64 }
65 else if (!strcmp(field, "Cached"))
66 {
67 info->cached = value;
68 }
69 else if (!strcmp(field, "SwapTotal"))
70 {
71 info->swap = value;
72 }
73 else if (!strcmp(field, "SwapFree"))
74 {
75 info->free_swap = value;
76 }
77
78 return true;
79 }
80
81 /************************************************************************/
82
MonMeminfoGatherData(double * cf_this)83 static void MonMeminfoGatherData(double *cf_this)
84 {
85 MemoryInfo info = { 0 };
86
87 FILE *fh = safe_fopen("/proc/meminfo", "r");
88 if (fh == NULL)
89 {
90 Log(LOG_LEVEL_ERR, "Unable to open /proc/meminfo. (fopen: %s)", GetErrorStr());
91 return;
92 }
93
94 if (ParseKeyNumericValue(fh, &AcceptMemoryField, &info))
95 {
96 int total_slot = NovaRegisterSlot(MON_MEM_TOTAL, "Total system memory", "megabytes",
97 512.0f, 4096.0f, true);
98 int free_slot = NovaRegisterSlot(MON_MEM_FREE, "Free system memory", "megabytes",
99 0.0f, 4096.0f, true);
100 int cached_slot = NovaRegisterSlot(MON_MEM_CACHED, "Size of disk cache", "megabytes",
101 0.0f, 4096.0f, true);
102 int swap_slot = NovaRegisterSlot(MON_MEM_SWAP, "Total swap size", "megabytes",
103 0.0f, 4096.0f, true);
104 int free_swap_slot = NovaRegisterSlot(MON_MEM_FREE_SWAP, "Free swap size", "megabytes",
105 0.0f, 8192.0f, true);
106
107 if (total_slot != -1)
108 {
109 cf_this[total_slot] = ((double) info.total) / KB / KB;
110 }
111 if (free_slot != -1)
112 {
113 cf_this[free_slot] = ((double) info.free) / KB / KB;
114 }
115 if (cached_slot != -1)
116 {
117 cf_this[cached_slot] = ((double) info.cached) / KB / KB;
118 }
119 if (swap_slot != -1)
120 {
121 cf_this[swap_slot] = ((double) info.swap) / KB / KB;
122 }
123 if (free_swap_slot != -1)
124 {
125 cf_this[free_swap_slot] = ((double) info.free_swap) / KB / KB;
126 }
127 }
128 else
129 {
130 Log(LOG_LEVEL_ERR, "Unable to parse /proc/meminfo");
131 }
132
133 fclose(fh);
134 }
135
136 /************************************************************************/
137
MonMemoryInit(const char ** name,const char ** error)138 ProbeGatherData MonMemoryInit(const char **name, const char **error)
139 {
140 if (access("/proc/meminfo", R_OK) == 0)
141 {
142 *name = "Linux /proc/meminfo statistics";
143 *error = NULL;
144 return &MonMeminfoGatherData;
145 }
146 else
147 {
148 *name = NULL;
149 *error = "/proc/meminfo is not readable";
150 return NULL;
151 }
152 }
153