## NMSetting

NMSetting — Describes related configuration information

## Synopsis

    #include <nm-setting.h>

    enum                NMSettingError;
    #define             NM_TYPE_SETTING_ERROR
    #define             NM_SETTING_ERROR
    GQuark              nm_setting_error_quark              (void);
    #define             NM_SETTING_PARAM_SERIALIZE
    #define             NM_SETTING_PARAM_REQUIRED
    #define             NM_SETTING_PARAM_SECRET
    #define             NM_SETTING_PARAM_FUZZY_IGNORE
    #define             NM_SETTING_NAME
                        NMSetting;
                        NMSettingClass;
    void                (*NMSettingValueIterFn)             (NMSetting *setting,
                                                             const char *key,
                                                             const GValue *value,
                                                             GParamFlags flags,
                                                             gpointer user_data);
    GType               nm_setting_get_type                 (void);
    GHashTable *        nm_setting_to_hash                  (NMSetting *setting);
    NMSetting *         nm_setting_new_from_hash            (GType setting_type,
                                                             GHashTable *hash);
    NMSetting *         nm_setting_duplicate                (NMSetting *setting);
    const char *        nm_setting_get_name                 (NMSetting *setting);
    gboolean            nm_setting_verify                   (NMSetting *setting,
                                                             GSList *all_settings,
                                                             GError **error);
    enum                NMSettingCompareFlags;
    gboolean            nm_setting_compare                  (NMSetting *a,
                                                             NMSetting *b,
                                                             NMSettingCompareFlags flags);
    enum                NMSettingDiffResult;
    gboolean            nm_setting_diff                     (NMSetting *a,
                                                             NMSetting *b,
                                                             NMSettingCompareFlags flags,
                                                             gboolean invert_results,
                                                             GHashTable **results);
    void                nm_setting_enumerate_values         (NMSetting *setting,
                                                             NMSettingValueIterFn func,
                                                             gpointer user_data);
    char *              nm_setting_to_string                (NMSetting *setting);
    void                nm_setting_clear_secrets            (NMSetting *setting);
    GPtrArray *         nm_setting_need_secrets             (NMSetting *setting);
    gboolean            nm_setting_update_secrets           (NMSetting *setting,
                                                             GHashTable *secrets,
                                                             GError **error);

## Object Hierarchy

      GObject
       +----NMSetting
             +----NMSetting8021x
             +----NMSettingBluetooth
             +----NMSettingCdma
             +----NMSettingConnection
             +----NMSettingGsm
             +----NMSettingIP4Config
             +----NMSettingIP6Config
             +----NMSettingOlpcMesh
             +----NMSettingPPP
             +----NMSettingPPPOE
             +----NMSettingSerial
             +----NMSettingVPN
             +----NMSettingWired
             +----NMSettingWireless
             +----NMSettingWirelessSecurity

## Properties

      "name"                     gchar*                : Read / Write

## Description

Each NMSetting contains properties that describe configuration that applies to a specific network layer (like IPv4 or IPv6 configuration) or device type (like Ethernet, or WiFi). A collection of individual settings together make up an NMConnection. Each property is strongly typed and usually has a number of allowed values. See each NMSetting subclass for a description of properties and allowed values.

## Details

### enum NMSettingError

    typedef enum
    {
    	NM_SETTING_ERROR_UNKNOWN = 0,
    	NM_SETTING_ERROR_PROPERTY_NOT_FOUND,
    	NM_SETTING_ERROR_PROPERTY_NOT_SECRET,
    	NM_SETTING_ERROR_PROPERTY_TYPE_MISMATCH
    } NMSettingError;

Describes errors that may result from operations involving a NMSetting.

`NM_SETTING_ERROR_UNKNOWN` | unknown or unclassified error
`NM_SETTING_ERROR_PROPERTY_NOT_FOUND` | a property required by the operation was not found; for example, an attempt to update an invalid secret
`NM_SETTING_ERROR_PROPERTY_NOT_SECRET` | an operation which requires a secret was attempted on a non-secret property
`NM_SETTING_ERROR_PROPERTY_TYPE_MISMATCH` | the operation requires a property of a specific type, or the value couldn't be transformed to the same type as the property being acted upon

### NM_TYPE_SETTING_ERROR

    #define NM_TYPE_SETTING_ERROR (nm_setting_error_get_type ())

### NM_SETTING_ERROR

    #define NM_SETTING_ERROR nm_setting_error_quark ()

### nm_setting_error_quark ()

    GQuark              nm_setting_error_quark              (void);

Registers an error quark for NMSetting if necessary.

Returns : | the error quark used for NMSetting errors.

### NM_SETTING_PARAM_SERIALIZE

    #define NM_SETTING_PARAM_SERIALIZE    (1 << (0 + G_PARAM_USER_SHIFT))

### NM_SETTING_PARAM_REQUIRED

    #define NM_SETTING_PARAM_REQUIRED     (1 << (1 + G_PARAM_USER_SHIFT))

### NM_SETTING_PARAM_SECRET

    #define NM_SETTING_PARAM_SECRET       (1 << (2 + G_PARAM_USER_SHIFT))

### NM_SETTING_PARAM_FUZZY_IGNORE

    #define NM_SETTING_PARAM_FUZZY_IGNORE (1 << (3 + G_PARAM_USER_SHIFT))

### NM_SETTING_NAME

    #define NM_SETTING_NAME "name"

### NMSetting

    typedef struct _NMSetting NMSetting;

The NMSetting struct contains only private data. It should only be accessed through the functions described below.

### NMSettingClass

    typedef struct {
    	GObjectClass parent;

    	/* Virtual functions */
    	gboolean    (*verify)            (NMSetting  *setting,
    	                                  GSList     *all_settings,
    	                                  GError     **error);

    	GPtrArray  *(*need_secrets)      (NMSetting  *setting);

    	gboolean    (*update_one_secret) (NMSetting  *setting,
    	                                  const char *key,
    	                                  GValue     *value,
    	                                  GError    **error);

    	/* Padding for future expansion */
    	void (*_reserved1) (void);
    	void (*_reserved2) (void);
    	void (*_reserved3) (void);
    	void (*_reserved4) (void);
    } NMSettingClass;

### NMSettingValueIterFn ()

    void                (*NMSettingValueIterFn)             (NMSetting *setting,
                                                             const char *key,
                                                             const GValue *value,
                                                             GParamFlags flags,
                                                             gpointer user_data);

`setting` : | The setting for which properties are being iterated, given to `nm_setting_enumerate_values()`
`key` : | The value/property name
`value` : | The property's value
`flags` : | The property's flags, like `NM_SETTING_PARAM_SECRET`
`user_data` : | User data passed to `nm_setting_enumerate_values()`

### nm_setting_get_type ()

    GType               nm_setting_get_type                 (void);

Returns : |

### nm_setting_to_hash ()

    GHashTable *        nm_setting_to_hash                  (NMSetting *setting);

Converts the NMSetting into a GHashTable mapping each setting property name to a GValue describing that property, suitable for marshalling over D-Bus or serializing. The mapping is string:GValue.

`setting` : | the NMSetting
Returns : | a new GHashTable describing the setting's properties

### nm_setting_new_from_hash ()

    NMSetting *         nm_setting_new_from_hash            (GType setting_type,
                                                             GHashTable *hash);

Creates a new NMSetting object and populates that object with the properties contained in the hash table, using each hash key as the property to set, and each hash value as the value to set that property to. Setting properties are strongly typed, thus the GValue type of the hash value must be correct. See the documentation on each NMSetting object subclass for the correct property names and value types.

`setting_type` : | the NMSetting type which the hash contains properties for
`hash` : | the GHashTable containing a string:GValue mapping of properties that apply to the setting
Returns : | a new NMSetting object populated with the properties from the hash table, or NULL on failure

### nm_setting_duplicate ()

    NMSetting *         nm_setting_duplicate                (NMSetting *setting);

Duplicates a NMSetting.

`setting` : | the NMSetting to duplicate
Returns : | a new NMSetting containing the same properties and values as the source NMSetting

### nm_setting_get_name ()

    const char *        nm_setting_get_name                 (NMSetting *setting);

Returns the type name of the NMSetting object

`setting` : | the NMSetting
Returns : | a string containing the type name of the NMSetting object, like 'ppp' or 'wireless' or 'wired'.

### nm_setting_verify ()

    gboolean            nm_setting_verify                   (NMSetting *setting,
                                                             GSList *all_settings,
                                                             GError **error);

Validates the setting. Each setting's properties have allowed values, and some are dependent on other values (hence the need for `all_settings`). The returned GError contains information about which property of the setting failed validation, and in what way that property failed validation.

`setting` : | the NMSetting to verify
`all_settings` : | a GSList of all settings in the connection from which `setting` came
`error` : | location to store error, or `NULL`
Returns : | `TRUE` if the setting is valid, `FALSE` if it is not

### enum NMSettingCompareFlags

    typedef enum {
    	NM_SETTING_COMPARE_FLAG_EXACT = 0x00000000,
    	NM_SETTING_COMPARE_FLAG_FUZZY = 0x00000001,
    	NM_SETTING_COMPARE_FLAG_IGNORE_ID = 0x00000002,
    	NM_SETTING_COMPARE_FLAG_IGNORE_SECRETS = 0x00000004
    } NMSettingCompareFlags;

These flags modify the comparison behavior when comparing two settings or two connections.

`NM_SETTING_COMPARE_FLAG_EXACT` | match all properties exactly
`NM_SETTING_COMPARE_FLAG_FUZZY` | match only important attributes, like SSID, type, security settings, etc. Does not match, for example, connection ID or UUID.
`NM_SETTING_COMPARE_FLAG_IGNORE_ID` | ignore the connection's ID
`NM_SETTING_COMPARE_FLAG_IGNORE_SECRETS` | ignore secrets

### nm_setting_compare ()

    gboolean            nm_setting_compare                  (NMSetting *a,
                                                             NMSetting *b,
                                                             NMSettingCompareFlags flags);

Compares two NMSetting objects for similarity, with comparison behavior modified by a set of flags. See the documentation for NMSettingCompareFlags for a description of each flag's behavior.

`a` : | a NMSetting
`b` : | a second NMSetting to compare with the first
`flags` : | compare flags, e.g. `NM_SETTING_COMPARE_FLAG_EXACT`
Returns : | `TRUE` if the comparison succeeds, `FALSE` if it does not

### enum NMSettingDiffResult

    typedef enum {
    	NM_SETTING_DIFF_RESULT_UNKNOWN = 0x00000000,
    	NM_SETTING_DIFF_RESULT_IN_A =    0x00000001,
    	NM_SETTING_DIFF_RESULT_IN_B =    0x00000002,
    } NMSettingDiffResult;

These values indicate the result of a setting difference operation.

`NM_SETTING_DIFF_RESULT_UNKNOWN` | unknown result
`NM_SETTING_DIFF_RESULT_IN_A` | the property is present in setting A
`NM_SETTING_DIFF_RESULT_IN_B` | the property is present in setting B

### nm_setting_diff ()

    gboolean            nm_setting_diff                     (NMSetting *a,
                                                             NMSetting *b,
                                                             NMSettingCompareFlags flags,
                                                             gboolean invert_results,
                                                             GHashTable **results);

Compares two NMSetting objects for similarity, with comparison behavior modified by a set of flags. See the documentation for NMSettingCompareFlags for a description of each flag's behavior. If the settings differ, the keys of each setting that differ from the other are added to `results`, mapped to one or more NMSettingDiffResult values.

`a` : | a NMSetting
`b` : | a second NMSetting to compare with the first
`flags` : | compare flags, e.g. `NM_SETTING_COMPARE_FLAG_EXACT`
`invert_results` : | this parameter is used internally by libnm-util and should be set to `FALSE`. If `TRUE` inverts the meaning of the NMSettingDiffResult.
`results` : | if the settings differ, on return a hash table mapping the differing keys to one or more NMSettingDiffResult values OR-ed together. If the settings do not differ, any hash table passed in is unmodified. If no hash table is passed in, a new one is created.
Returns : | `TRUE` if the settings contain the same values, `FALSE` if they do not

### nm_setting_enumerate_values ()

    void                nm_setting_enumerate_values         (NMSetting *setting,
                                                             NMSettingValueIterFn func,
                                                             gpointer user_data);

Iterates over each property of the NMSetting object, calling the supplied user function for each property.

`setting` : | the NMSetting
`func` : | user-supplied function called for each property of the setting
`user_data` : | user data passed to `func` at each invocation

### nm_setting_to_string ()

    char *              nm_setting_to_string                (NMSetting *setting);

Convert the setting into a string. For debugging purposes ONLY, should NOT be used for serialization of the setting, or machine-parsed in any way. The output format is not guaranteed to be stable and may change at any time.

`setting` : | the NMSetting
Returns : | an allocated string containing a textual representation of the setting's properties and values (including secrets!), which the caller should free with `g_free()`

### nm_setting_clear_secrets ()

    void                nm_setting_clear_secrets            (NMSetting *setting);

Resets and clears any secrets in the setting. Secrets should be added to the setting only when needed, and cleared immediately after use to prevent leakage of information.

`setting` : | the NMSetting

### nm_setting_need_secrets ()

    GPtrArray *         nm_setting_need_secrets             (NMSetting *setting);

Returns an array of property names for each secret which may be required to make a successful connection. The returned hints are only intended as a guide to what secrets may be required, because in some circumstances, there is no way to conclusively determine exactly which secrets are needed.

`setting` : | the NMSetting
Returns : | a GPtrArray containing the property names of secrets of the NMSetting which may be required; the caller owns the array and must free the each array element with `g_free()`, as well as the array itself with `g_ptr_array_free()`

### nm_setting_update_secrets ()

    gboolean            nm_setting_update_secrets           (NMSetting *setting,
                                                             GHashTable *secrets,
                                                             GError **error);

Update the setting's secrets, given a hash table of secrets intended for that setting (deserialized from D-Bus for example).

`setting` : | the NMSetting
`secrets` : | a GHashTable mapping string:GValue of setting property names and secrets
`error` : | location to store error, or `NULL`
Returns : | `TRUE` if the secrets were successfully updated and the connection is valid, `FALSE` on failure or if the setting was never added to the connection

## Property Details

### The `"name"` property

      "name"                     gchar*                : Read / Write

The setting's name, which uniquely identifies the setting within the connection. Each setting type has a name unique to that type, for example 'ppp' or 'wireless' or 'wired'.

Default value: NULL