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netconfig (4)
  • >> netconfig (4) ( Solaris man: Специальные файлы /dev/* )
  • netconfig (5) ( FreeBSD man: Форматы файлов )
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    NAME

    netconfig - network configuration database
     
    

    SYNOPSIS

    /etc/netconfig
    

     

    DESCRIPTION

    The network configuration database, /etc/netconfig, is a system file used to store information about networks that are connected to the system. The netconfig database and the routines that access it (see getnetconfig(3NSL)) are part of the Network Selection component. The Network Selection component also includes getnetpath(3NSL) routines to provide application-specific network search paths. These routines access the netconfig database based on the environment variable NETPATH. See environ(5).

    netconfig contains an entry for each network available on the system. Entries are separated by newlines. Fields are separated by whitespace and occur in the order in which they are described below. Whitespace can be embedded as ``\blank'' or ``\tab''. Backslashes may be embedded as ``\\''. Lines in /etc/netconfig that begin with a # (hash) in column 1 are treated as comments.

    Each of the valid lines in the netconfig database correspond to an available transport. Each entry is of the form:

    network ID  semantics  flag  protocol-family \
    protocol-name  network-device  translation-libraries
    

    network ID

    A string used to uniquely identify a network. network ID consists of non-null characters, and has a length of at least 1. No maximum length is specified. This namespace is locally significant and the local system administrator is the naming authority. All network IDs on a system must be unique.

    semantics

    The semantics field is a string identifying the ``semantics'' of the network, that is, the set of services it supports, by identifying the service interface it provides. The semantics field is mandatory. The following semantics are recognized.

    tpi_clts

    Transport Provider Interface, connectionless

    tpi_cots

    Transport Provider Interface, connection oriented

    tpi_cots_ord

    Transport Provider Interface, connection oriented, supports orderly release.

    flag

    The flag field records certain two-valued (``true'' and ``false'') attributes of networks. flag is a string composed of a combination of characters, each of which indicates the value of the corresponding attribute. If the character is present, the attribute is ``true.'' If the character is absent, the attribute is ``false.'' ``-'' indicates that none of the attributes are present. Only one character is currently recognized:

    v

    Visible (``default'') network. Used when the environment variable NETPATH is unset.

    protocol family

    The protocol family and protocol name fields are provided for protocol-specific applications. The protocol family field contains a string that identifies a protocol family. The protocol family identifier follows the same rules as those for network IDs; the string consists of non-null characters, it has a length of at least 1, and there is no maximum length specified. A ``-'' in the protocol family field indicates that no protocol family identifier applies (the network is experimental). The following are examples:

    loopback

    Loopback (local to host).

    inet

    Internetwork: UDP, TCP, and the like.

    inet6

    Internetwork over IPv6: UDP, TCP, and the like.

    implink

    ARPANET imp addresses

    pup

    PUP protocols: for example, BSP

    chaos

    MIT CHAOS protocols

    ns

    XEROX NS protocols

    nbs

    NBS protocols

    ecma

    European Computer Manufacturers Association

    datakit

    DATAKIT protocols

    ccitt

    CCITT protocols, X.25, and the like.

    sna

    IBM SNA

    decnet

    DECNET

    dli

    Direct data link interface

    lat

    LAT

    hylink

    NSC Hyperchannel

    appletalk

    Apple Talk

    nit

    Network Interface Tap

    ieee802

    IEEE 802.2; also ISO 8802

    osi

    Umbrella for all families used by OSI (for example, protosw lookup)

    x25

    CCITT X.25 in particular

    osinet

    AFI = 47, IDI = 4

    gosip

    U.S. Government OSI

    protocol name

    The protocol name field contains a string that identifies a protocol. The protocol name identifier follows the same rules as those for network IDs; that is, the string consists of non-NULL characters, it has a length of at least 1, and there is no maximum length specified. A ``-'' indicates that none of the names listed apply. The following protocol names are recognized.

    tcp

    Transmission Control Protocol

    udp

    User Datagram Protocol

    icmp

    Internet Control Message Protocol

    network device

    The network device is the full pathname of the device used to connect to the transport provider. Typically, this device will be in the /dev directory. The network device must be specified.

    translation libraries

    The name-to-address translation libraries support a ``directory service'' (a name-to-address mapping service) for the network. A ``-'' in this field indicates the absence of any translation libraries. This has a special meaning for networks of the protocol family inet : its name-to-address mapping is provided by the name service switch based on the entries for hosts and services in nsswitch.conf(4). For networks of other families, a ``-'' indicates non-functional name-to-address mapping. Otherwise, this field consists of a comma-separated list of pathnames to dynamically linked libraries. The pathname of the library can be either absolute or relative. See dlopen(3C).

    Each field corresponds to an element in the struct netconfig structure. struct netconfig and the identifiers described on this manual page are defined in <netconfig.h>. This structure includes the following members:

    char *nc_netid

    Network ID, including NULL terminator.

    unsigned long nc_semantics

    Semantics.

    unsigned long nc_flag

    Flags.

    char *nc_protofmly

    Protocol family.

    char *nc_proto

    Protocol name.

    char *nc_device

    Full pathname of the network device.

    unsigned long nc_nlookups

    Number of directory lookup libraries.

    char **nc_lookups

    Names of the name-to-address translation libraries.

    unsigned long nc_unused[9]

    Reserved for future expansion.

    The nc_semantics field takes the following values, corresponding to the semantics identified above:
    NC_TPI_CLTS
    NC_TPI_COTS
    NC_TPI_COTS_ORD

    The nc_flag field is a bitfield. The following bit, corresponding to the attribute identified above, is currently recognized. NC_NOFLAG indicates the absence of any attributes.

    NC_VISIBLE
    

     

    EXAMPLES

    Example 1 A Sample netconfig File

    Below is a sample netconfig file:

    #
    #  The "Network Configuration" File.
    #
    # Each entry is of the form:
    #
    #   <networkid> <semantics> <flags> <protofamily> <protoname> <device>
    #         <nametoaddrlibs>
    #
    # The "-" in <nametoaddrlibs> for inet family transports indicates
    # redirection to the name service switch policies for "hosts" and
    # "services". The "-" may be replaced by nametoaddr libraries that
    # comply with the SVr4 specs, in which case the name service switch
    # will not be used for netdir_getbyname, netdir_getbyaddr,
    # gethostbyname, gethostbyaddr, getservbyname, and getservbyport.
    # There are no nametoaddr_libs for the inet family in Solaris anymore.
    #
    udp6       tpi_clts      v   inet6   udp    /dev/udp6       -
    tcp6       tpi_cots_ord  v   inet6   tcp    /dev/tcp6       -
    udp        tpi_clts      v   inet    udp    /dev/udp        -
    tcp        tpi_cots_ord  v   inet    tcp    /dev/tcp        -
    rawip      tpi_raw       -   inet    -      /dev/rawip      -
    ticlts     tpi_clts      v   loopback -      /dev/ticlts     straddr.so
    ticotsord  tpi_cots_ord  v   loopback -      /dev/ticotsord  straddr.so
    ticots     tpi_cots      v   loopback -      /dev/ticots     straddr.so
    

     

    FILES

    <netconfig.h>

     

    SEE ALSO

    dlopen(3C), getnetconfig(3NSL), getnetpath(3NSL), nsswitch.conf(4)

    System Administration Guide: IP Services


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    EXAMPLES
    FILES
    SEE ALSO


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