120 lines
3.0 KiB
Groff
120 lines
3.0 KiB
Groff
.\" $NetBSD: netconfig.5,v 1.5 2001/09/11 01:01:58 wiz Exp $
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.Dd November 17, 2000
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.Dt NETCONFIG 5
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.Sh NAME
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.Nm netconfig
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.Nd network configuration data base
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.Sh SYNOPSIS
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.Fa /etc/netconfig
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.Sh DESCRIPTION
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The
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.Nm
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file defines a list of
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.Dq transport names ,
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describing their semantics and protocol. In
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.Nx ,
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this file is only used by the RPC library code.
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.Pp
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Entries have the following format:
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.Dl network_id semantics flags family protoname device libraries
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.Pp
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Entries consist of the following fields:
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.Pp
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.Bl -tag -width network_id
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.It Em network_id
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The name of the transport described.
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.It Em semantics
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Describes the semantics of the transport. This can be one of:
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.Bl -tag -width tpi_cots_ord -offset indent
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.It Sy tpi_clts
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Connectionless transport.
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.It Sy tpi_cots
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Connection-oriented transport
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.It Sy tpi_cots_ord
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Connection-oriented, ordered transport.
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.It Sy tpi_raw
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A raw connection.
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.El
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.It Em flags
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This field is either blank (specified by
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.Dq \&- ) ,
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or contains a
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.Dq v ,
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meaning visible to the
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.Xr getnetconfig 3
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function.
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.It Em family
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The protocol family of the transport. This is currently one of:
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.Bl -tag -width loopback -offset indent
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.It Sy inet6
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The IPv6
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.Pq Dv PF_INET6
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family of protocols.
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.It Sy inet
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The IPv4
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.Pq Dv PF_INET
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family of protocols.
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.It Sy loopback
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The
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.Dv PF_LOCAL
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protocol family.
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.El
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.It Em protoname
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The name of the protocol used for this transport. Can currently be either
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.Nm udp ,
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.Nm tcp
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or empty.
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.It Em device
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This field is always empty in
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.Nx .
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.It Em libraries
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This field is always empty in
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.Nx .
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.El
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.Pp
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The order of entries in this file will determine which transport will
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be preferred by the RPC library code, given a match on a specified
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network type. For example, if a sample network config file would
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look like this:
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.Pp
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.Bd -literal -offset indent
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udp6 tpi_clts v inet6 udp - -
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tcp6 tpi_cots_ord v inet6 tcp - -
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udp tpi_clts v inet udp - -
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tcp tpi_cots_ord v inet tcp - -
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rawip tpi_raw - inet - - -
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local tpi_cots_ord - loopback - - -
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.Ed
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.Pp
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then using the network type
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.Nm udp
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in calls to the RPC library function (see
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.Xr rpc 3 )
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will make the code first try
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.Nm udp6 ,
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and then
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.Nm udp .
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.Pp
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.Xr getnetconfig 3
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and associated functions will parse this file and return structures of
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the following format:
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.Bd -literal
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struct netconfig {
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char *nc_netid; /* Network ID */
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unsigned long nc_semantics; /* Semantics (see below) */
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unsigned long nc_flag; /* Flags (see below) */
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char *nc_protofmly; /* Protocol family */
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char *nc_proto; /* Protocol name */
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char *nc_device; /* Network device pathname (unused) */
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unsigned long nc_nlookups; /* Number of lookup libs (unused) */
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char **nc_lookups; /* Names of the libraries (unused) */
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unsigned long nc_unused[9]; /* reserved */
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};
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.Ed
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.Sh FILES
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.Nm /etc/netconfig
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.Sh SEE ALSO
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.Xr getnetconfig 3 ,
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.Xr getnetpath 3
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