vintage_net v0.7.7 VintageNet View Source

VintageNet is network configuration library built specifically for Nerves Project devices. It has the following features:

  • Ethernet and WiFi support included. Extendible to other technologies
  • Default configurations specified in your Application config
  • Runtime updates to configurations are persisted and applied on next boot (can be disabled)
  • Simple subscription to network status change events
  • Connect to multiple networks at a time and prioritize which interfaces are used (Ethernet over WiFi over cellular)
  • Internet connection monitoring and failure detection (currently slow and simplistic)

See github.com/nerves-networking/vintage_net for more information.

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Types

IP addresses in VintageNet can be specified as strings or tuples

A name for the network interface

Valid options for VintageNet.info/1

The number of bits to use for an IPv4 subnet

The number of bits to use for an IPv6 subnet

The number of IP address bits for the subnet

Functions

Return a list of all interfaces on the system

Check if this is a valid configuration

Update the configuration of a network interface

Return a list of configured interface

Deconfigure settings for a specified interface.

Get the current value of a network property

Get a list of all properties matching the specified prefix

Return the settings for the specified interface

Print the current network status

Run a command on a network interface

Get a list of all properties matching a pattern

Return the maximum number of interfaces controlled by VintageNet

Initiate an access point scan on a wireless interface

Subscribe to property change messages

Stop subscribing to property change messages

Check that the system has the required programs installed

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any_ip_address()

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any_ip_address() :: String.t() | :inet.ip_address()

IP addresses in VintageNet can be specified as strings or tuples

While VintageNet uses IP addresses in tuple form internally, it can be cumbersome to always convert to tuple form in practice. The general rule is that VintageNet is flexible in how it accepts IP addresses, but if you get an address from a VintageNet API, it will be in tuple form.

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configure_options()

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configure_options() :: [{:persist, boolean()}]

Valid options for VintageNet.configure/3

  • :persist - Whether or not to save the configuration (defaults to true)

A name for the network interface

Names depend on the device drivers and any software that may rename them. Typical names on Nerves are:

  • "eth0", "eth1", etc. for wired Ethernet interfaces
  • "wlan0", etc. for WiFi interfaces
  • "ppp0" for cellular modems
  • "usb0" for gadget USB virtual Ethernet interfaces
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info_options()

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info_options() :: {:redact, boolean()}

Valid options for VintageNet.info/1

  • :redact - Whether to hide passwords and similar information from the output (defaults to true)
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ipv4_prefix_length()

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ipv4_prefix_length() :: 0..32

The number of bits to use for an IPv4 subnet

For example, if you have a subnet mask of 255.255.255.0, then the prefix length would be 24.

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ipv6_prefix_length()

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ipv6_prefix_length() :: 0..128

The number of bits to use for an IPv6 subnet

The number of IP address bits for the subnet

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all_interfaces()

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all_interfaces() :: [ifname()]

Return a list of all interfaces on the system

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configuration_valid?(ifname, config)

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configuration_valid?(ifname(), map()) :: boolean()

Check if this is a valid configuration

This runs the validation routines for a settings map, but doesn't try to apply them.

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configure(ifname, config, options \\ [])

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configure(ifname(), map(), configure_options()) :: :ok | {:error, any()}

Update the configuration of a network interface

Configurations are validated and normalized before being applied. This means that type errors and missing required fields will be caught and old or redundant ways of specifying configurations will be fixed. Call get_configuration/1 to see how what changes, if any, were made as part of the normalization process.

After validation, the configuration is optionally persisted and applied.

See the VintageNet documentation for configuration examples or your VintageNet.Technology provider's docs.

Options:

  • :persist - set to false to avoid persisting this configuration. System restarts will revert to the previous configuration.
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configured_interfaces()

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configured_interfaces() :: [ifname()]

Return a list of configured interface

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deconfigure(ifname, options \\ [])

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deconfigure(ifname(), configure_options()) :: :ok | {:error, any()}

Deconfigure settings for a specified interface.

Supports same options as configure/3

Get the current value of a network property

See get_by_prefix/1 for exact prefix matches (i.e., get all properties for one interface) and match/1 to run wildcard matches (i.e., get a specific property for all interfaces).

Get a list of all properties matching the specified prefix

To get a list of all known properties and their values, call VintageNet.get_by_prefix([])

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get_configuration(ifname)

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get_configuration(ifname()) :: map()

Return the settings for the specified interface

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info(options \\ [])

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info([info_options()]) :: :ok

Print the current network status

Options include:

  • :redact - Set to false to print out passwords
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ioctl(ifname, command, args \\ [])

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ioctl(ifname(), atom(), any()) :: :ok | {:ok, any()} | {:error, any()}

Run a command on a network interface

Commands are mostly network interface-specific. Also see the VintageNet PropertyTable fo getting status or registering for status changes.

Get a list of all properties matching a pattern

Patterns are list of strings that optionally specify :_ at a position in the list to match any value.

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max_interface_count()

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max_interface_count() :: 1..100

Return the maximum number of interfaces controlled by VintageNet

Internal constraints mean that VintageNet can't manage an arbitrary number of interfaces and knowing the max can reduce some processing. The limit is set by the application config. Unless you need over 100 network interfaces, VintageNet's use of the Linux networking API is not likely to be an issue, though.

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scan(ifname)

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scan(ifname()) :: :ok | {:error, any()}

Initiate an access point scan on a wireless interface

The scan results are posted asynchronously to the ["interface", ifname, "wifi", "access_points"] property as they come in. It appears that there's some variation in how scanning is implemented on WiFi adapters. One strategy that seems to work is to call scan/1 every 10 seconds or so while prompting a user to pick a WiFi network.

This is a utility function for calling the :scan ioctl.

Subscribe to property change messages

Messages have the form:

{VintageNet, property_name, old_value, new_value, metadata}

Subscriptions are prefix matches. For example, to get notified whenever a property changes on "wlan0", run this:

VintageNet.subscribe(["interface", "wlan0"])

It's also possible to match with wildcards using :_. For example, to get notified whenever an IP address in the system changes, do this:

VintageNet.subscribe(["interface", :_, "addresses"])

Stop subscribing to property change messages

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verify_system(opts \\ nil)

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verify_system(keyword() | nil) :: :ok | {:error, String.t()}

Check that the system has the required programs installed

NOTE: This isn't completely implemented yet!