Added `wireless' plugin

diff --git a/configure.in b/configure.in
index 4e9c1563787045d9edfcb008a2e1c2a2bbd36991..d9ac9177e97ec21352fcad15738c277fb8aaae98 100644 (file)
--- a/configure.in
+++ b/configure.in
@@ -494,6 +494,7 @@ AC_COLLECTD([swap],      [disable], [module], [swap statistics])
 AC_COLLECTD([tape],      [disable], [module], [tape statistics])
 AC_COLLECTD([traffic],   [disable], [module], [system traffic statistics])
 AC_COLLECTD([users],     [disable], [module], [user count statistics])
+AC_COLLECTD([wireless],  [disable], [module], [wireless link statistics])
 
 #m4_divert_once([HELP_ENABLE], [
 #collectd modules:])
@@ -746,5 +747,6 @@ Configuration:
     tape  . . . . . . . $enable_tape
     traffic . . . . . . $enable_traffic
     users . . . . . . . $enable_users
+    wireless  . . . . . $enable_wireless
 
 EOF

diff --git a/src/Makefile.am b/src/Makefile.am
index 73d29b05e6d15d370c168672e63b8cc94d4bc43e..f6cca37b67184dd64b925e564f4bf7d92def21ee 100644 (file)
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -207,6 +207,16 @@ collectd_LDADD += "-dlopen" users.la
 collectd_DEPENDENCIES += users.la
 endif
 
+if BUILD_MODULE_WIRELESS
+pkglib_LTLIBRARIES += wireless.la
+wireless_la_SOURCES = wireless.c
+wireless_la_LDFLAGS = -module -avoid-version
+# FIXME Make `-lm' conditional
+wireless_la_LDFLAGS += -lm
+collectd_LDADD += "-dlopen" wireless.la
+collectd_DEPENDENCIES += wireless.la
+endif
+
 man_MANS = collectd.1 collectd.conf.5
 #collectd_1_SOURCES = collectd.pod
 

diff --git a/src/wireless.c b/src/wireless.c
new file mode 100644 (file)
index 0000000..be366c4
--- /dev/null
+++ b/src/wireless.c
@@ -0,0 +1,186 @@
+/**
+ * collectd - src/wireless.c
+ * Copyright (C) 2006  Florian octo Forster
+ *
+ * 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 St, Fifth Floor, Boston, MA  02110-1301 USA
+ *
+ * Author:
+ *   Florian octo Forster <octo at verplant.org>
+ **/
+
+#include "collectd.h"
+#include "common.h"
+#include "plugin.h"
+
+#include <math.h>
+
+#define MODULE_NAME "wireless"
+#define BUFSIZE 1024
+
+#if defined(KERNEL_LINUX)
+# define WIRELESS_HAVE_READ 1
+#else
+# define WIRELESS_HAVE_READ 0
+#endif
+
+#define WIRELESS_PROC_FILE "/proc/net/wireless"
+
+static char *filename_template = "wireless-%s.rrd";
+
+static char *ds_def[] =
+{
+       "DS:quality:GAUGE:25:0:U",
+       "DS:power:GAUGE:25:0:U",
+       "DS:noise:GAUGE:25:0:U",
+       NULL
+};
+static int ds_num = 3;
+
+#if WIRELESS_HAVE_READ
+static int proc_file_found = 0;
+#endif
+
+static void wireless_init (void)
+{
+#if WIRELESS_HAVE_READ
+       if (access (WIRELESS_PROC_FILE, R_OK) == 0)
+               proc_file_found = 1;
+       else
+               proc_file_found = 0;
+#endif
+
+       return;
+}
+
+static void wireless_write (char *host, char *inst, char *val)
+{
+       char file[BUFSIZE];
+       int status;
+
+       status = snprintf (file, BUFSIZE, filename_template, inst);
+       if (status < 1)
+               return;
+       else if (status >= BUFSIZE)
+               return;
+
+       rrd_update_file (host, file, val, ds_def, ds_num);
+}
+
+#if WIRELESS_HAVE_READ
+static double wireless_dbm_to_watt (double dbm)
+{
+       double watt;
+
+       /*
+        * dbm = 10 * log_{10} (1000 * power / W)
+        * power = 10^(dbm/10) * W/1000 
+        */
+
+       watt = pow (10.0, (dbm / 10.0)) / 1000.0;
+
+       return (watt);
+}
+
+static void wireless_submit (char *device,
+               double quality, double power, double noise)
+{
+       char buf[BUFSIZE];
+       int  status;
+
+       status = snprintf (buf, BUFSIZE, "%u:%f:%f:%f",
+                       (unsigned int) curtime,
+                       quality, power, noise);
+       if ((status < 1) || (status >= BUFSIZE))
+               return;
+
+       plugin_submit (MODULE_NAME, device, buf);
+}
+
+static void wireless_read (void)
+{
+#ifdef KERNEL_LINUX
+
+       FILE *fh;
+       char buffer[BUFSIZE];
+
+       char   *device;
+       double  quality;
+       double  power;
+       double  noise;
+       
+       char *fields[8];
+       int   numfields;
+
+       int len;
+
+       if (!proc_file_found)
+               return;
+
+       /* there are a variety of names for the wireless device */
+       if ((fh = fopen (WIRELESS_PROC_FILE, "r")) == NULL)
+       {
+               syslog (LOG_WARNING, "wireless: fopen: %s", strerror (errno));
+               return;
+       }
+
+       while (fgets (buffer, BUFSIZE, fh) != NULL)
+       {
+               numfields = strsplit (buffer, fields, 8);
+
+               if (numfields < 5)
+                       continue;
+
+               len = strlen (fields[0]) - 1;
+               if (len < 1)
+                       continue;
+               if (fields[0][len] != ':')
+                       continue;
+               fields[0][len] = '\0';
+
+               device  = fields[0];
+               quality = atof (fields[2]);
+               power   = atof (fields[3]);
+               noise   = atof (fields[4]);
+
+               if (quality == 0.0)
+                       quality = -1.0;
+
+               if (power >= 0.0)
+                       power = -1.0;
+               else
+                       power = wireless_dbm_to_watt (power);
+
+               if (noise >= 0.0)
+                       noise = -1.0;
+               else
+                       noise = wireless_dbm_to_watt (noise);
+
+               wireless_submit (device, quality, power, noise);
+       }
+
+       fclose (fh);
+#endif /* KERNEL_LINUX */
+}
+#else
+# define wireless_read NULL
+#endif /* WIRELESS_HAVE_READ */
+
+void module_register (void)
+{
+   plugin_register (MODULE_NAME, wireless_init, wireless_read, wireless_write);
+}
+
+#undef BUFSIZE
+#undef MODULE_NAME