net (kernel v10.3)

-type address_info() ::
          #{family := socket:domain(),
            socktype := any | socket:type() | integer(),
            protocol := socket:protocol(),
            address := socket:sockaddr()}.

ifaddrs()

(since OTP 22.0)

-type ifaddrs() ::
          #{name := string(),
            flags := ifaddrs_flags(),
            addr => socket:sockaddr(),
            netmask => socket:sockaddr(),
            broadaddr => socket:sockaddr(),
            dstaddr => socket:sockaddr()}.

Interface addresses and flags.

This type defines addresses and flags for an interface.

Note

Not all fields of this map has to be present. The flags field can be used to test for some of the fields. For example broadaddr will only be present if the broadcast flag is present in flags.

ifaddrs_filter()

(not exported) (since OTP 22.0)

-type ifaddrs_filter() ::
          all | default | inet | inet6 | packet | link | hwaddr |
          ifaddrs_filter_map() |
          ifaddrs_filter_fun().

Interface address filtering selector.

all - All interfaces
default - Interfaces with address family inet or inet6
inet | inet6 | packet | link - Interfaces with only the specified address family
hwaddr - Interfaces with address family packet or link

ifaddrs_filter_fun()

(not exported) (since OTP 22.0)

-type ifaddrs_filter_fun() :: fun((ifaddrs()) -> boolean()).

Interface address filtering selector function/0.

For each ifaddrs entry, return either true to keep the entry or false to discard the entry.

For example, to get an interface list which only contains non-loopback inet interfaces:

net:getifaddrs(
    fun (#{ addr  := #{family := inet},
            flags := Flags}) ->
          not lists:member(loopback, Flags);
        (_) ->
          false
    end).

ifaddrs_filter_map()

(not exported) (since OTP 22.0)

-type ifaddrs_filter_map() ::
          #{family :=
                all | default | local | inet | inet6 | packet | link |
                [local | inet | inet6 | packet | link],
            flags := any | [ifaddrs_flag()]}.

Interface address filtering selector map.

The family field can only have the (above) specified values (and not all the values of socket:domain()). It can also be a list of values, to cover the situation when any of the specified families are accepted. For example, family can be set to [inet,inet6] if either inet or inet6 is accepted.

The use of the flags field is that any flag provided must exist for the interface.

For example, if family is set to inet and flags to [broadcast, multicast] only interfaces with address family inet and the flags broadcast and multicast will be listed.

ifaddrs_flag()

(since OTP 22.0)

-type ifaddrs_flag() ::
          up | broadcast | debug | loopback | pointopoint | notrailers | running | noarp | promisc |
          master | slave | multicast | portsel | automedia | dynamic.

ifaddrs_flags()

(since OTP 22.0)

-type ifaddrs_flags() :: [ifaddrs_flag()].

name_info()

(since OTP 22.0)

-type name_info() :: #{host := string(), service := string()}.

name_info_flag()

(since OTP 22.0)

-type name_info_flag() :: namereqd | dgram | nofqdn | numerichost | numericserv.

name_info_flag_ext()

(since OTP 22.0)

-type name_info_flag_ext() :: idn.

name_info_flags()

(since OTP 22.0)

-type name_info_flags() :: [name_info_flag() | name_info_flag_ext()].

network_interface_index()

(since OTP 22.0)

-type network_interface_index() :: non_neg_integer().

network_interface_name()

(since OTP 22.0)

-type network_interface_name() :: string().

Functions

getaddrinfo(Host)

(since OTP 22.0)

-spec getaddrinfo(Host) -> {ok, Info} | {error, Reason}
                     when Host :: string(), Info :: [address_info()], Reason :: term().

Equivalent to getaddrinfo(Host, undefined).

getaddrinfo(Host, Service)

(since OTP 22.0)

-spec getaddrinfo(Host, undefined) -> {ok, Info} | {error, Reason}
                     when Host :: string(), Info :: [address_info()], Reason :: term();
                 (undefined, Service) -> {ok, Info} | {error, Reason}
                     when Service :: string(), Info :: [address_info()], Reason :: term();
                 (Host, Service) -> {ok, Info} | {error, Reason}
                     when
                         Host :: string(),
                         Service :: string(),
                         Info :: [address_info()],
                         Reason :: term().

Network address and service translation.

This function is the inverse of getnameinfo. It converts host and service to a corresponding socket address.

One of the Host and Service may be undefined but not both.

gethostname()

(since OTP 22.0)

-spec gethostname() -> {ok, HostName} | {error, Reason} when HostName :: string(), Reason :: term().

Return the name of the current host.

getifaddrs()

(since OTP 22.3)

-spec getifaddrs() -> {ok, IfAddrs} | {error, Reason} when IfAddrs :: [ifaddrs()], Reason :: term().

Equivalent to getifaddrs(default).

getifaddrs/1

(since OTP 22.3)

-spec getifaddrs(Filter) -> {ok, IfAddrs} | {error, Reason}
                    when Filter :: ifaddrs_filter(), IfAddrs :: [ifaddrs()], Reason :: term();
                (Namespace) -> {ok, IfAddrs} | {error, Reason}
                    when Namespace :: file:filename_all(), IfAddrs :: [ifaddrs()], Reason :: term().

Get interface addresses.

With argument 'Filter: get the machines interface addresses, filtered according to Filter.

With argument Namespace: equivalent to getifaddrs(default, Namespace).

getifaddrs(Filter, Namespace)

(since OTP 22.3)

-spec getifaddrs(Filter, Namespace) -> {ok, IfAddrs} | {error, Reason}
                    when
                        Filter :: ifaddrs_filter(),
                        Namespace :: file:filename_all(),
                        IfAddrs :: [ifaddrs()],
                        Reason :: term().

Get interface addresses in a namespace.

The same as getifaddrs(Filter) but in the specified Namespace.

getnameinfo(SockAddr)

(since OTP 22.0)

-spec getnameinfo(SockAddr) -> {ok, Info} | {error, Reason}
                     when SockAddr :: socket:sockaddr(), Info :: name_info(), Reason :: term().

Equivalent to getnameinfo(SockAddr, undefined).

getnameinfo(SockAddr, Flags)

(since OTP 22.0)

-spec getnameinfo(SockAddr, Flags) -> {ok, Info} | {error, Reason}
                     when
                         SockAddr :: socket:sockaddr(),
                         Flags :: name_info_flags() | undefined,
                         Info :: name_info(),
                         Reason :: term().

Address-to-name translation in a protocol-independant manner.

This function is the inverse of getaddrinfo. It converts a socket address to a corresponding host and service.

getservbyname(Name)

(since OTP 27.1)

-spec getservbyname(Name) -> {ok, PortNumber} | {error, Reason}
                       when
                           Name :: atom() | string(),
                           PortNumber :: socket:port_number(),
                           Reason :: term().

Equivalent to getservbyname(Name, any).

getservbyname(Name, Protocol)

(since OTP 27.1)

-spec getservbyname(Name, Protocol) -> {ok, PortNumber} | {error, Reason}
                       when
                           Name :: atom() | string(),
                           PortNumber :: socket:port_number(),
                           Protocol :: any | socket:protocol(),
                           Reason :: term().

Get service by name.

This function is used to get the port number of the specified protocol for the named service.

getservbyport(PortNumber)

(since OTP 27.1)

-spec getservbyport(PortNumber) -> {ok, Name} | {error, Reason}
                       when
                           PortNumber :: socket:port_number(),
                           Name :: atom() | string(),
                           Reason :: term().

Equivalent to getservbyport(PortNumber, any).

getservbyport(PortNumber, Protocol)

(since OTP 27.1)

-spec getservbyport(PortNumber, Protocol) -> {ok, Name} | {error, Reason}
                       when
                           PortNumber :: socket:port_number(),
                           Protocol :: any | socket:protocol(),
                           Name :: atom() | string(),
                           Reason :: term().

Get service by name.

This function is used to get the service name of the specified protocol for the given port number.

if_index2name(Idx)

(since OTP 22.0)

-spec if_index2name(Idx) -> {ok, Name} | {error, Reason}
                       when
                           Idx :: network_interface_index(),
                           Name :: network_interface_name(),
                           Reason :: term().

Mappings between network interface index and names.

if_name2index(Name)

(since OTP 22.0)

-spec if_name2index(Name) -> {ok, Idx} | {error, Reason}
                       when
                           Name :: network_interface_name(),
                           Idx :: network_interface_index(),
                           Reason :: term().

Mappings between network interface names and indexes.

if_names()

(since OTP 22.0)

-spec if_names() -> {ok, Names} | {error, Reason}
                  when
                      Names :: [{Idx, If}],
                      Idx :: network_interface_index(),
                      If :: network_interface_name(),
                      Reason :: term().

Get network interface names and indexes.