From e781b99dd81c7470e3b4055c4362c3841efb04a8 Mon Sep 17 00:00:00 2001 From: Florian Forster Date: Wed, 26 Dec 2007 15:34:18 +0100 Subject: [PATCH] sensors plugin: While I was at it I reorganized the code a little so it's easier to read. For instance I moved the name to type conversion out of the main loop and into a separate function, likewise the chip to string representation conversion. The `submit' function is now very careful that all strings are null terminated and that no buffer overflow may occur. --- src/sensors.c | 190 ++++++++++++++++++++++++++++++++-------------------------- 1 file changed, 104 insertions(+), 86 deletions(-) diff --git a/src/sensors.c b/src/sensors.c index 9319f204..1289d4b6 100644 --- a/src/sensors.c +++ b/src/sensors.c @@ -42,17 +42,22 @@ # define SENSORS_API_VERSION 0x000 #endif -#define SENSOR_TYPE_VOLTAGE 0 -#define SENSOR_TYPE_FANSPEED 1 -#define SENSOR_TYPE_TEMPERATURE 2 -#define SENSOR_TYPE_UNKNOWN 3 - +/* + * The sensors library prior to version 3.0 (internal version 0x400) didn't + * report the type of values, only a name. The following lists are there to + * convert from the names to the type. They are not used with the new + * interface. + */ #if SENSORS_API_VERSION < 0x400 -static char *sensor_to_type[] = +static char *sensor_type_name_map[] = { +# define SENSOR_TYPE_VOLTAGE 0 "voltage", +# define SENSOR_TYPE_FANSPEED 1 "fanspeed", +# define SENSOR_TYPE_TEMPERATURE 2 "temperature", +# define SENSOR_TYPE_UNKNOWN 3 NULL }; @@ -63,9 +68,7 @@ struct sensors_labeltypes_s }; typedef struct sensors_labeltypes_s sensors_labeltypes_t; -/* - * finite list of known labels extracted from lm_sensors - */ +/* finite list of known labels extracted from lm_sensors */ static sensors_labeltypes_t known_features[] = { { "fan1", SENSOR_TYPE_FANSPEED }, @@ -128,10 +131,9 @@ static int known_features_num = STATIC_ARRAY_SIZE (known_features); static const char *config_keys[] = { "Sensor", - "IgnoreSelected", - NULL + "IgnoreSelected" }; -static int config_keys_num = 2; +static int config_keys_num = STATIC_ARRAY_SIZE (config_keys); #if SENSORS_API_VERSION < 0x400 typedef struct featurelist @@ -171,6 +173,52 @@ featurelist_t *first_feature = NULL; static ignorelist_t *sensor_list; static time_t sensors_config_mtime = 0; +#if SENSORS_API_VERSION < 0x400 +/* full chip name logic borrowed from lm_sensors */ +static int sensors_snprintf_chip_name (char *buf, size_t buf_size, + const sensors_chip_name *chip) +{ + int status = -1; + + if (chip->bus == SENSORS_CHIP_NAME_BUS_ISA) + { + status = snprintf (buf, buf_size, + "%s-isa-%04x", + chip->prefix, + chip->addr); + } + else if (chip->bus == SENSORS_CHIP_NAME_BUS_DUMMY) + { + snprintf (buf, buf_size, "%s-%s-%04x", + chip->prefix, + chip->busname, + chip->addr); + } + else + { + snprintf (buf, buf_size, "%s-i2c-%d-%02x", + chip->prefix, + chip->bus, + chip->addr); + } + + return (status); +} /* int sensors_snprintf_chip_name */ + +static int sensors_feature_name_to_type (const char *name) +{ + int i; + + /* Yes, this is slow, but it's only ever done during initialization, so + * it's a one time cost.. */ + for (i = 0; i < known_features_num; i++) + if (strcasecmp (known_features[i].label, name) == 0) + return (known_features[i].type); + + return (SENSOR_TYPE_UNKNOWN); +} /* int sensors_feature_name_to_type */ +#endif + static int sensors_config (const char *key, const char *value) { if (sensor_list == NULL) @@ -281,7 +329,8 @@ static int sensors_load_conf (void) while (42) { const sensors_feature_data *feature; - int i; + int feature_type; + featurelist_t *fl; feature = sensors_get_all_features (*chip, &feature_num0, &feature_num1); @@ -294,63 +343,43 @@ static int sensors_load_conf (void) if (feature->mapping != SENSORS_NO_MAPPING) continue; - /* Only known features */ - for (i = 0; i < known_features_num; i++) - { - featurelist_t *fl; - - if (strcasecmp (feature->name, - known_features[i].label) - != 0) - continue; - - /* skip ignored in sensors.conf */ - if (sensors_get_ignored (*chip, feature->number) == 0) - break; - - DEBUG ("Adding feature: %s-%s-%s", - chip->prefix, - sensor_to_type[known_features[i].type], - feature->name); - - fl = (featurelist_t *) malloc (sizeof (featurelist_t)); - if (fl == NULL) - { - ERROR ("sensors plugin: malloc failed."); - continue; - } - memset (fl, '\0', sizeof (featurelist_t)); - - fl->chip = chip; - fl->data = feature; - fl->type = known_features[i].type; + /* skip ignored in sensors.conf */ + if (sensors_get_ignored (*chip, feature->number) == 0) + break; - if (first_feature == NULL) - first_feature = fl; - else - last_feature->next = fl; - last_feature = fl; + feature_type = sensors_feature_name_to_type ( + feature->name); + if (feature_type == SENSOR_TYPE_UNKNOWN) + continue; - /* stop searching known features at first found */ - break; - } /* for i */ + fl = (featurelist_t *) malloc (sizeof (featurelist_t)); + if (fl == NULL) + { + ERROR ("sensors plugin: malloc failed."); + continue; + } + memset (fl, '\0', sizeof (featurelist_t)); + + fl->chip = chip; + fl->data = feature; + fl->type = feature_type; + + if (first_feature == NULL) + first_feature = fl; + else + last_feature->next = fl; + last_feature = fl; } /* while sensors_get_all_features */ } /* while sensors_get_detected_chips */ /* #endif SENSORS_API_VERSION < 0x400 */ #elif (SENSORS_API_VERSION >= 0x400) && (SENSORS_API_VERSION < 0x500) chip_num = 0; - DEBUG ("sensors plugin: Calling sensors_get_detected_chips (NULL, %p)..", (void *) &chip_num); while ((chip = sensors_get_detected_chips (NULL, &chip_num)) != NULL) { const sensors_feature *feature; int feature_num = 0; - DEBUG ("sensors plugin: Handling chip with prefix `%s'", - (chip->prefix == NULL) - ? "(nil)" - : chip->prefix); - while ((feature = sensors_get_features (chip, &feature_num)) != NULL) { const sensors_subfeature *subfeature; @@ -425,7 +454,7 @@ static void sensors_submit (const char *plugin_instance, status = snprintf (match_key, sizeof (match_key), "%s/%s-%s", plugin_instance, type, type_instance); - if ((status < 1) || (status >= sizeof (match_key))) + if (status < 1) return; match_key[sizeof (match_key) - 1] = '\0'; @@ -441,10 +470,16 @@ static void sensors_submit (const char *plugin_instance, vl.values = values; vl.values_len = 1; vl.time = time (NULL); - strcpy (vl.host, hostname_g); - strcpy (vl.plugin, "sensors"); - strcpy (vl.plugin_instance, plugin_instance); - strcpy (vl.type_instance, type_instance); + + strncpy (vl.host, hostname_g, sizeof (vl.host)); + vl.host[sizeof (vl.host) - 1] = '\0'; + strncpy (vl.plugin, "sensors", sizeof (vl.plugin)); + vl.plugin[sizeof (vl.plugin) - 1] = '\0'; + strncpy (vl.plugin_instance, plugin_instance, + sizeof (vl.plugin_instance)); + vl.plugin_instance[sizeof (vl.plugin_instance) - 1] = '\0'; + strncpy (vl.type_instance, type_instance, sizeof (vl.type_instance)); + vl.type_instance[sizeof (vl.type_instance) - 1] = '\0'; plugin_dispatch_values (type, &vl); } /* void sensors_submit */ @@ -469,35 +504,18 @@ static int sensors_read (void) if (status < 0) continue; - /* full chip name logic borrowed from lm_sensors */ - if (fl->chip->bus == SENSORS_CHIP_NAME_BUS_ISA) - { - snprintf (plugin_instance, DATA_MAX_NAME_LEN, - "%s-isa-%04x", - fl->chip->prefix, - fl->chip->addr); - } - else if (fl->chip->bus == SENSORS_CHIP_NAME_BUS_DUMMY) - { - snprintf (plugin_instance, 512, "%s-%s-%04x", - fl->chip->prefix, - fl->chip->busname, - fl->chip->addr); - } - else - { - snprintf (plugin_instance, 512, "%s-i2c-%d-%02x", - fl->chip->prefix, - fl->chip->bus, - fl->chip->addr); - } + status = sensors_snprintf_chip_name (plugin_instance, + sizeof (plugin_instance), fl->chip); + if (status < 0) + continue; plugin_instance[sizeof (plugin_instance) - 1] = '\0'; - strncpy (type_instance, fl->data->name, sizeof (type_instance)); + strncpy (type_instance, fl->data->name, + sizeof (type_instance)); type_instance[sizeof (type_instance) - 1] = '\0'; sensors_submit (plugin_instance, - sensor_to_type[fl->type], + sensor_type_name_map[fl->type], type_instance, value); } /* for fl = first_feature .. NULL */ -- 2.11.0