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.\" Author: Archie Cobbs <archie@freebsd.org>
.\"
.\" $Id: route_msg.3,v 1.1 2012/02/21 23:25:53 misho Exp $
.\"
.Dd April 22, 2002
.Dt ROUTE_MSG 3
.Os
.Sh NAME
.Nm route_msg
.Nd routing socket message objects
.Sh LIBRARY
PDEL Library (libpdel, \-lpdel)
.Sh SYNOPSIS
.In sys/types.h
.In stdio.h
.In pdel/net/route_msg.h
.Ft "struct route_msg *"
.Fn route_msg_create "void"
.Ft "void"
.Fn route_msg_destroy "struct route_msg **msgp"
.Ft "int"
.Fn route_msg_get_type "struct route_msg *msg"
.Ft "void"
.Fn route_msg_set_type "struct route_msg *msg" "int type"
.Ft "int"
.Fn route_msg_get_index "struct route_msg *msg"
.Ft "void"
.Fn route_msg_set_index "struct route_msg *msg" "int index"
.Ft "int"
.Fn route_msg_get_flags "struct route_msg *msg"
.Ft "void"
.Fn route_msg_set_flags "struct route_msg *msg" "int flags"
.Ft "int"
.Fn route_msg_get_error "struct route_msg *msg"
.Ft "pid_t"
.Fn route_msg_get_pid "struct route_msg *msg"
.Ft "int"
.Fn route_msg_get_seq "struct route_msg *msg"
.Ft "const struct sockaddr *"
.Fn route_msg_get_dest "struct route_msg *msg"
.Ft "int"
.Fn route_msg_set_dest "struct route_msg *msg" "const struct sockaddr *dest"
.Ft "const struct sockaddr *"
.Fn route_msg_get_gateway "struct route_msg *msg"
.Ft "int"
.Fn route_msg_set_gateway "struct route_msg *msg" "const struct sockaddr *gateway"
.Ft "const struct sockaddr *"
.Fn route_msg_get_netmask "struct route_msg *msg"
.Ft "int"
.Fn route_msg_set_netmask "struct route_msg *msg" "const struct sockaddr *netmask"
.Ft "const struct sockaddr *"
.Fn route_msg_get_genmask "struct route_msg *msg"
.Ft "int"
.Fn route_msg_set_genmask "struct route_msg *msg" "const struct sockaddr *genmask"
.Ft "const struct sockaddr *"
.Fn route_msg_get_ifp "struct route_msg *msg"
.Ft "int"
.Fn route_msg_set_ifp "struct route_msg *msg" "const struct sockaddr *ifp"
.Ft "const struct sockaddr *"
.Fn route_msg_get_ifa "struct route_msg *msg"
.Ft "int"
.Fn route_msg_set_ifa "struct route_msg *msg" "const struct sockaddr *ifa"
.Ft "const struct sockaddr *"
.Fn route_msg_get_author "struct route_msg *msg"
.Ft "int"
.Fn route_msg_set_author "struct route_msg *msg" "const struct sockaddr *author"
.Ft "const struct sockaddr *"
.Fn route_msg_get_brd "struct route_msg *msg"
.Ft "int"
.Fn route_msg_set_brd "struct route_msg *msg" "const struct sockaddr *brd"
.Ft "int"
.Fn route_msg_decode "const u_char *data" "size_t dlen" "struct route_msg ***listp" "const char *mtype"
.Ft "int"
.Fn route_msg_encode "const struct route_msg *msg" "u_char *data" "size_t dlen"
.Ft "void"
.Fn route_msg_print "struct route_msg *msg" "FILE *fp"
.Ft "int"
.Fn route_msg_send "struct route_msg *msg" "int sock"
.Ft "int"
.Fn route_msg_recv "struct route_msg ***listp" "int sock" "const char *mtype"
.Sh DESCRIPTION
These functions support
.Nm "route_msg"
objects, used for communication over kernel routing sockets.
The routing socket messages are defined in the header file
.Li "<net/route.h>" .
Each
.Nm route_msg
instance is represented by a
.Li "struct route_msg" .
.Pp
.Fn route_msg_create
creates a new, empty
.Nm route_msg
object.
.Pp
.Fn route_msg_destroy
destroys the object pointed to by
.Fa "*msgp" .
Upon return,
.Fa "*msgp"
will be set to
.Dv NULL .
If
.Fa "*msgp"
is already
.Dv NULL
when
.Fn route_msg_destroy
is invoked, nothing happens.
.Pp
The
.Fn route_msg_get_XXX
and
.Fn route_msg_set_XXX
routines allow reading and changing the attributes associated with a
.Nm route_msg
object.
.Pp
.Fn route_msg_decode
decodes routing messages from data encoded in the format used when
communicating over kernel routing sockets.
The encoded data is pointed to by
.Fa data
and has length
.Fa dlen .
Zero or more
.Nm route_msg
objects are constructed and pointed to by the elements of a newly
allocated array of pointers.
The length of the array is returned by
.Fn route_msg_decode
and a pointer to the array is stored in
.Fa "*listp" .
The array itself is allocated with
.Xr typed_mem 3
type
.Fa mtype ,
and the caller is responsible for eventually freeing it (as well as
destroying the individudal
.Nm route_msg
objects).
If the encoded data is invalid, -1 is returned with
.Va errno
set to
.Er EINVAL .
.Pp
.Fn route_msg_encode
encodes a
.Nm route_msg
object into the format used when communicating over kernel routing sockets.
The resulting data is stored in the buffer pointed to by
.Fa data ,
which must have length at least
.Fa dlen .
If the encoding does not fit in
.Fa dlen
bytes, -1 is returned with
.Va errno
set to
.Er EMSGSIZE .
Otherwise, the number of bytes actually written into
.Fa data
is returned.
.Pp
.Fn route_msg_print
prints out a
.Nm route_msg
object to the stream
.Fa fp
for debugging purposes.
.Pp
.Fn route_msg_send
encodes and writes the
.Nm route_msg
object to the routing socket descriptor
.Fa sock .
.Pp
.Nm route_msg_recv
reads the next packet from the routing socket descriptor
.Fa sock
and decodes
.Nm route_msg
objects from the data read.
The
.Fa listp
and
.Fa mtype
parameters are the same as with
.Fn route_msg_decode .
.Sh RETURN VALUES
Except for functions returning
.Li "void" ,
all of the above functions return -1 or
.Dv NULL
to indicate an error, with
.Va errno
set appropriately.
.Sh SEE ALSO
.Xr if_util 3 ,
.Xr libpdel 3 ,
.Xr typed_mem 3 ,
.Xr uroute 3 ,
.Xr route 4
.Sh HISTORY
The PDEL library was developed at Packet Design, LLC.
.Dv "http://www.packetdesign.com/"
.Sh AUTHORS
.An Archie Cobbs Aq archie@freebsd.org