1518 lines
28 KiB
Groff
1518 lines
28 KiB
Groff
.\" @(#)rpc.3n 2.4 88/08/08 4.0 RPCSRC; from 1.19 88/06/24 SMI
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.\" $FreeBSD$
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.\"
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.Dd February 16, 1988
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.Dt RPC 3
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.Os
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.Sh NAME
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.Nm rpc
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.Nd "library routines for remote procedure calls"
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.Fd "#include <rpc/rpc.h>"
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.Pp
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See
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.Sx DESCRIPTION
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for function declarations.
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.Sh DESCRIPTION
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These routines allow C programs to make procedure
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calls on other machines across the network.
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First, the client calls a procedure to send a
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data packet to the server.
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Upon receipt of the packet, the server calls a dispatch routine
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to perform the requested service, and then sends back a
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reply.
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Finally, the procedure call returns to the client.
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.Pp
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Routines that are used for Secure
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.Tn RPC ( DES
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authentication) are described in
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.Xr rpc_secure 3 .
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Secure
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.Tn RPC
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can be used only if
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.Tn DES
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encryption is available.
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.Bl -tag -width indent -compact
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.Pp
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.It Xo
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.Ft void
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.Xc
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.It Xo
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.Fn auth_destroy "AUTH *auth"
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.Xc
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.Pp
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A macro that destroys the authentication information associated with
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.Fa auth .
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Destruction usually involves deallocation of private data
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structures.
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The use of
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.Fa auth
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is undefined after calling
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.Fn auth_destroy .
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.Pp
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.It Xo
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.Ft "AUTH *"
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.Xc
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.It Xo
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.Fn authnone_create
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.Xc
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.Pp
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Create and return an
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.Tn RPC
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authentication handle that passes nonusable authentication
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information with each remote procedure call.
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This is the
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default authentication used by
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.Tn RPC .
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.Pp
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.It Xo
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.Ft "AUTH *"
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.Xc
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.It Xo
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.Fn authunix_create "char *host" "int uid" "int gid" "int len" "int *aup_gids"
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.Xc
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.Pp
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Create and return an
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.Tn RPC
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authentication handle that contains
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.Ux
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authentication information.
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The parameter
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.Fa host
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is the name of the machine on which the information was
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created;
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.Fa uid
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is the user's user ID;
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.Fa gid
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is the user's current group ID;
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.Fa len
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and
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.Fa aup_gids
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refer to a counted array of groups to which the user belongs.
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It is easy to impersonate a user.
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.Pp
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.It Xo
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.Ft "AUTH *"
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.Xc
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.It Xo
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.Fn authunix_create_default
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.Xc
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.Pp
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Calls
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.Fn authunix_create
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with the appropriate parameters.
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.Pp
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.It Xo
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.Fo callrpc
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.Fa "char *host"
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.Fa "u_long prognum"
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.Fa "u_long versnum"
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.Fa "u_long procnum"
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.Fa "xdrproc_t inproc"
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.Fa "char *in"
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.Fa "xdrproc_t outproc"
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.Fa "char *out"
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.Fc
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.Xc
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.Pp
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Call the remote procedure associated with
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.Fa prognum ,
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.Fa versnum ,
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and
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.Fa procnum
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on the machine
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.Fa host .
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The parameter
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.Fa in
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is the address of the procedure's argument(s), and
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.Fa out
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is the address of where to place the result(s);
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.Fa inproc
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is used to encode the procedure's parameters, and
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.Fa outproc
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is used to decode the procedure's results.
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This routine returns zero if it succeeds, or the value of
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.Vt "enum clnt_stat"
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cast to an integer if it fails.
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The routine
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.Fn clnt_perrno
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is handy for translating failure statuses into messages.
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.Pp
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Warning: calling remote procedures with this routine
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uses
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.Tn UDP/IP
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as a transport; see
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.Fn clntudp_create
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for restrictions.
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You do not have control of timeouts or authentication using
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this routine.
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.Pp
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.It Xo
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.Ft "enum clnt_stat"
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.Xc
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.It Xo
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.Fo clnt_broadcast
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.Fa "u_long prognum"
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.Fa "u_long versnum"
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.Fa "u_long procnum"
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.Fa "xdrproc_t inproc"
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.Fa "char *in"
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.Fa "xdrproc_t outproc"
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.Fa "char *out"
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.Fa "bool_t (*eachresult)(caddr_t, struct sockaddr_in *)
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.Fc
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.Xc
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.Pp
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Like
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.Fn callrpc ,
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except the call message is broadcast to all locally
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connected broadcast nets.
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Each time it receives a
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response, this routine calls
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.Fn eachresult ,
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whose form is:
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.Bd -ragged -offset indent
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.Ft bool_t
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.Fn eachresult "caddr_t out" "struct sockaddr_in *addr"
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.Ed
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.Pp
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where
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.Fa out
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is the same as
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.Fa out
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passed to
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.Fn clnt_broadcast ,
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except that the remote procedure's output is decoded there;
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.Fa addr
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points to the address of the machine that sent the results.
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If
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.Fn eachresult
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returns zero,
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.Fn clnt_broadcast
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waits for more replies; otherwise it returns with appropriate
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status.
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.Pp
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Warning: broadcast sockets are limited in size to the
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maximum transfer unit of the data link.
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For ethernet,
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this value is 1500 bytes.
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.Pp
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.It Xo
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.Ft "enum clnt_stat"
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.Xc
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.It Xo
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.Fo clnt_call
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.Fa "CLIENT *clnt"
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.Fa "u_long procnum"
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.Fa "xdrproc_t inproc"
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.Fa "char *in"
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.Fa "xdrproc_t outproc"
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.Fa "char *out"
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.Fa "struct timeval tout"
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.Fc
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.Xc
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.Pp
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A macro that calls the remote procedure
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.Fa procnum
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associated with the client handle,
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.Fa clnt ,
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which is obtained with an
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.Tn RPC
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client creation routine such as
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.Fn clnt_create .
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The parameter
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.Fa in
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is the address of the procedure's argument(s), and
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.Fa out
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is the address of where to place the result(s);
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.Fa inproc
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is used to encode the procedure's parameters, and
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.Fa outproc
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is used to decode the procedure's results;
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.Fa tout
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is the time allowed for results to come back.
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.Pp
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.It Xo
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.Ft void
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.Fn clnt_destroy "CLIENT *clnt"
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.Xc
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.Pp
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A macro that destroys the client's
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.Tn RPC
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handle.
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Destruction usually involves deallocation
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of private data structures, including
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.Fa clnt
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itself.
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Use of
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.Fa clnt
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is undefined after calling
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.Fn clnt_destroy .
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If the
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.Tn RPC
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library opened the associated socket, it will close it also.
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Otherwise, the socket remains open.
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.Pp
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.It Xo
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.Ft CLIENT *
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.Xc
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.It Xo
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.Fn clnt_create "char *host" "u_long prog" "u_long vers" "char *proto"
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.Xc
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.Pp
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Generic client creation routine.
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.Fa host
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identifies the name of the remote host where the server
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is located.
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.Fa proto
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indicates which kind of transport protocol to use.
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The
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currently supported values for this field are
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.Qq Li udp
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and
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.Qq Li tcp .
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Default timeouts are set, but can be modified using
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.Fn clnt_control .
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.Pp
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Warning: Using
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.Tn UDP
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has its shortcomings.
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Since
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.Tn UDP Ns \-based
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.Tn RPC
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messages can only hold up to 8 Kbytes of encoded data,
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this transport cannot be used for procedures that take
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large arguments or return huge results.
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.Pp
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.It Xo
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.Ft bool_t
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.Xc
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.It Xo
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.Fn clnt_control "CLIENT *cl" "u_int req" "char *info"
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.Xc
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.Pp
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A macro used to change or retrieve various information
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about a client object.
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.Fa req
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indicates the type of operation, and
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.Fa info
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is a pointer to the information.
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For both
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.Tn UDP
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and
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.Tn TCP ,
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the supported values of
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.Fa req
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and their argument types and what they do are:
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.Bl -column "CLSET_RETRY_TIMEOUT" "struct sockaddr_in"
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.It Dv CLSET_TIMEOUT Ta Xo
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.Vt "struct timeval" Ta "set total timeout"
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.Xc
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.It Dv CLGET_TIMEOUT Ta Xo
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.Vt "struct timeval" Ta "get total timeout"
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.Xc
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.El
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.Pp
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Note: if you set the timeout using
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.Fn clnt_control ,
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the timeout parameter passed to
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.Fn clnt_call
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will be ignored in all future calls.
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.Bl -column "CLSET_RETRY_TIMEOUT" "struct sockaddr_in"
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.It Dv CLGET_SERVER_ADDR Ta Xo
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.Vt "struct sockaddr_in" Ta "get server's address"
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.Xc
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.El
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.Pp
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The following operations are valid for
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.Tn UDP
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only:
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.Bl -column "CLSET_RETRY_TIMEOUT" "struct sockaddr_in"
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.It Dv CLSET_RETRY_TIMEOUT Ta Xo
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.Vt "struct timeval" Ta "set the retry timeout"
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.Xc
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.It Dv CLGET_RETRY_TIMEOUT Ta Xo
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.Vt "struct timeval" Ta "get the retry timeout"
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.Xc
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.El
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.Pp
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The retry timeout is the time that
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.Tn "UDP RPC"
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waits for the server to reply before
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retransmitting the request.
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.Pp
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.It Xo
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.Ft bool_t
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.Fn clnt_freeres "CLIENT *clnt" "xdrproc_t outproc" "char *out"
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.Xc
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.Pp
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A macro that frees any data allocated by the
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.Tn RPC/XDR
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system when it decoded the results of an
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.Tn RPC
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call.
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The parameter
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.Fa out
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is the address of the results, and
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.Fa outproc
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is the
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.Tn XDR
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routine describing the results.
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This routine returns one if the results were successfully
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freed,
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and zero otherwise.
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.Pp
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.It Xo
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.Ft void
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.Xc
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.It Xo
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.Fn clnt_geterr "CLIENT *clnt" "struct rpc_err *errp"
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.Xc
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.Pp
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A macro that copies the error structure out of the client
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handle
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to the structure at address
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.Fa errp .
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.Pp
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.It Xo
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.Ft void
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.Xc
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.It Xo
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.Fn clnt_pcreateerror "char *s"
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.Xc
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.Pp
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prints a message to standard error indicating
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why a client
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.Tn RPC
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handle could not be created.
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The message is prepended with string
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.Fa s
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and a colon.
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Used when a
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.Fn clnt_create ,
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.Fn clntraw_create ,
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.Fn clnttcp_create ,
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or
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.Fn clntudp_create
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call fails.
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.Pp
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.It Xo
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.Ft void
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.Xc
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.It Xo
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.Fn clnt_perrno "enum clnt_stat stat"
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.Xc
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.Pp
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Print a message to standard error corresponding
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to the condition indicated by
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.Fa stat .
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Used after
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.Fn callrpc .
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.Pp
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.It Xo
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.Ft void
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.Fn clnt_perror "CLIENT *clnt" "char *s"
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.Xc
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.Pp
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Print a message to standard error indicating why an
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.Tn RPC
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call failed;
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.Fa clnt
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is the handle used to do the call.
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The message is prepended with string
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.Fa s
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and a colon.
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Used after
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.Fn clnt_call .
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.Pp
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.It Xo
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.Ft "char *"
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.Xc
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.It Xo
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.Fn clnt_spcreateerror "char *s"
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.Xc
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.Pp
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Like
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.Fn clnt_pcreateerror ,
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except that it returns a string
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instead of printing to the standard error.
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.Pp
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Bugs: returns pointer to static data that is overwritten
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on each call.
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.Pp
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.It Xo
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.Ft "char *"
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.Xc
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.It Xo
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.Fn clnt_sperrno "enum clnt_stat stat"
|
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.Xc
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.Pp
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Take the same arguments as
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.Fn clnt_perrno ,
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but instead of sending a message to the standard error
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indicating why an
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.Tn RPC
|
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call failed, return a pointer to a string which contains
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the message.
|
|
The string ends with a newline
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.Pq Ql "\en" .
|
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.Pp
|
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.Fn clnt_sperrno
|
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is used instead of
|
|
.Fn clnt_perrno
|
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if the program does not have a standard error (as a program
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running as a server quite likely does not), or if the
|
|
programmer
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does not want the message to be output with
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.Fn printf ,
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or if a message format different from that supported by
|
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.Fn clnt_perrno
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is to be used.
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.Pp
|
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Note: unlike
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|
.Fn clnt_sperror
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and
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.Fn clnt_spcreaterror ,
|
|
.Fn clnt_sperrno
|
|
returns pointer to static data, but the
|
|
result will not get overwritten on each call.
|
|
.Pp
|
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.It Xo
|
|
.Ft "char *"
|
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.Xc
|
|
.It Xo
|
|
.Fn clnt_sperror "CLIENT *rpch" "char *s"
|
|
.Xc
|
|
.Pp
|
|
Like
|
|
.Fn clnt_perror ,
|
|
except that (like
|
|
.Fn clnt_sperrno )
|
|
it returns a string instead of printing to standard error.
|
|
.Pp
|
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Bugs: returns pointer to static data that is overwritten
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on each call.
|
|
.Pp
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|
.It Xo
|
|
.Ft "CLIENT *"
|
|
.Xc
|
|
.It Xo
|
|
.Fn clntraw_create "u_long prognum" "u_long versnum"
|
|
.Xc
|
|
.Pp
|
|
This routine creates a toy
|
|
.Tn RPC
|
|
client for the remote program
|
|
.Fa prognum ,
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|
version
|
|
.Fa versnum .
|
|
The transport used to pass messages to the service is
|
|
actually a buffer within the process's address space, so the
|
|
corresponding
|
|
.Tn RPC
|
|
server should live in the same address space; see
|
|
.Fn svcraw_create .
|
|
This allows simulation of
|
|
.Tn RPC
|
|
and acquisition of
|
|
.Tn RPC
|
|
overheads, such as round trip times, without any
|
|
kernel interference.
|
|
This routine returns
|
|
.Dv NULL
|
|
if it fails.
|
|
.Pp
|
|
.It Xo
|
|
.Ft "CLIENT *"
|
|
.Xc
|
|
.It Xo
|
|
.Fo clnttcp_create
|
|
.Fa "struct sockaddr_in *addr"
|
|
.Fa "u_long prognum"
|
|
.Fa "u_long versnum"
|
|
.Fa "int *sockp"
|
|
.Fa "u_int sendsz"
|
|
.Fa "u_int recvsz"
|
|
.Fc
|
|
.Xc
|
|
.Pp
|
|
This routine creates an
|
|
.Tn RPC
|
|
client for the remote program
|
|
.Fa prognum ,
|
|
version
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|
.Fa versnum ;
|
|
the client uses
|
|
.Tn TCP/IP
|
|
as a transport.
|
|
The remote program is located at Internet
|
|
address
|
|
.Fa addr .
|
|
If
|
|
.Fa addr\->sin_port
|
|
is zero, then it is set to the actual port that the remote
|
|
program is listening on (the remote
|
|
.Xr portmap 8
|
|
service is consulted for this information).
|
|
The parameter
|
|
.Fa sockp
|
|
is a socket; if it is
|
|
.Dv RPC_ANYSOCK ,
|
|
then this routine opens a new one and sets
|
|
.Fa sockp .
|
|
Since
|
|
.Tn TCP Ns \-based
|
|
.Tn RPC
|
|
uses buffered
|
|
.Tn I/O ,
|
|
the user may specify the size of the send and receive buffers
|
|
with the parameters
|
|
.Fa sendsz
|
|
and
|
|
.Fa recvsz ;
|
|
values of zero choose suitable defaults.
|
|
This routine returns
|
|
.Dv NULL
|
|
if it fails.
|
|
.Pp
|
|
.It Xo
|
|
.Ft "CLIENT *"
|
|
.Xc
|
|
.It Xo
|
|
.Fo clntudp_create
|
|
.Fa "struct sockaddr_in *addr"
|
|
.Fa "u_long prognum"
|
|
.Fa "u_long versnum"
|
|
.Fa "struct timeval wait"
|
|
.Fa "int *sockp"
|
|
.Fc
|
|
.Xc
|
|
.Pp
|
|
This routine creates an
|
|
.Tn RPC
|
|
client for the remote program
|
|
.Fa prognum ,
|
|
version
|
|
.Fa versnum ;
|
|
the client uses
|
|
.Tn UDP/IP
|
|
as a transport.
|
|
The remote program is located at Internet
|
|
address
|
|
.Fa addr .
|
|
If
|
|
.Fa addr\->sin_port
|
|
is zero, then it is set to actual port that the remote
|
|
program is listening on (the remote
|
|
.Xr portmap 8
|
|
service is consulted for this information).
|
|
The parameter
|
|
.Fa sockp
|
|
is a socket; if it is
|
|
.Dv RPC_ANYSOCK ,
|
|
then this routine opens a new one and sets
|
|
.Fa sockp .
|
|
The
|
|
.Tn UDP
|
|
transport resends the call message in intervals of
|
|
.Fa wait
|
|
time until a response is received or until the call times
|
|
out.
|
|
The total time for the call to time out is specified by
|
|
.Fn clnt_call .
|
|
.Pp
|
|
Warning: since
|
|
.Tn UDP Ns \-based
|
|
.Tn RPC
|
|
messages can only hold up to 8 Kbytes
|
|
of encoded data, this transport cannot be used for procedures
|
|
that take large arguments or return huge results.
|
|
.Pp
|
|
.It Xo
|
|
.Ft "CLIENT *"
|
|
.Xc
|
|
.It Xo
|
|
.Fo clntudp_bufcreate
|
|
.Fa "struct sockaddr_in *addr"
|
|
.Fa "u_long prognum"
|
|
.Fa "u_long versnum"
|
|
.Fa "struct timeval wait"
|
|
.Fa "int *sockp"
|
|
.Fa "unsigned int sendsize"
|
|
.Fa "unsigned int recosize"
|
|
.Fc
|
|
.Xc
|
|
.Pp
|
|
This routine creates an
|
|
.Tn RPC
|
|
client for the remote program
|
|
.Fa prognum ,
|
|
on
|
|
.Fa versnum ;
|
|
the client uses
|
|
.Tn UDP/IP
|
|
as a transport.
|
|
The remote program is located at Internet
|
|
address
|
|
.Fa addr .
|
|
If
|
|
.Fa addr\->sin_port
|
|
is zero, then it is set to actual port that the remote
|
|
program is listening on (the remote
|
|
.Xr portmap 8
|
|
service is consulted for this information).
|
|
The parameter
|
|
.Fa sockp
|
|
is a socket; if it is
|
|
.Dv RPC_ANYSOCK ,
|
|
then this routine opens a new one and sets
|
|
.Fa sockp .
|
|
The
|
|
.Tn UDP
|
|
transport resends the call message in intervals of
|
|
.Fa wait
|
|
time until a response is received or until the call times
|
|
out.
|
|
The total time for the call to time out is specified by
|
|
.Fn clnt_call .
|
|
.Pp
|
|
This allows the user to specify the maximum packet size
|
|
for sending and receiving
|
|
.Tn UDP Ns \-based
|
|
.Tn RPC
|
|
messages.
|
|
.Pp
|
|
.It Xo
|
|
.Ft int
|
|
.Xc
|
|
.It Xo
|
|
.Fn get_myaddress "struct sockaddr_in *addr"
|
|
.Xc
|
|
.Pp
|
|
Stuff the machine's
|
|
.Tn IP
|
|
address into
|
|
.Fa addr ,
|
|
without consulting the library routines that deal with
|
|
.Pa /etc/hosts .
|
|
The port number is always set to
|
|
.Fn htons PMAPPORT .
|
|
Returns zero on success, non-zero on failure.
|
|
.Pp
|
|
.It Xo
|
|
.Ft "struct pmaplist *"
|
|
.Xc
|
|
.It Xo
|
|
.Fn pmap_getmaps "struct sockaddr_in *addr"
|
|
.Xc
|
|
.Pp
|
|
A user interface to the
|
|
.Xr portmap 8
|
|
service, which returns a list of the current
|
|
.Tn RPC
|
|
program\-to\-port mappings
|
|
on the host located at
|
|
.Tn IP
|
|
address
|
|
.Fa addr .
|
|
This routine can return
|
|
.Dv NULL .
|
|
The command
|
|
.Dq Nm rpcinfo Fl p
|
|
uses this routine.
|
|
.Pp
|
|
.It Xo
|
|
.Ft u_short
|
|
.Xc
|
|
.It Xo
|
|
.Fo pmap_getport
|
|
.Fa "struct sockaddr_in *addr"
|
|
.Fa "u_long prognum"
|
|
.Fa "u_long versnum"
|
|
.Fa "u_long protocol"
|
|
.Fc
|
|
.Xc
|
|
.Pp
|
|
A user interface to the
|
|
.Xr portmap 8
|
|
service, which returns the port number
|
|
on which waits a service that supports program number
|
|
.Fa prognum ,
|
|
version
|
|
.Fa versnum ,
|
|
and speaks the transport protocol associated with
|
|
.Fa protocol .
|
|
The value of
|
|
.Fa protocol
|
|
is most likely
|
|
.Dv IPPROTO_UDP
|
|
or
|
|
.Dv IPPROTO_TCP .
|
|
A return value of zero means that the mapping does not exist
|
|
or that
|
|
the
|
|
.Tn RPC
|
|
system failed to contact the remote
|
|
.Xr portmap 8
|
|
service.
|
|
In the latter case, the global variable
|
|
.Va rpc_createerr
|
|
contains the
|
|
.Tn RPC
|
|
status.
|
|
.Pp
|
|
.It Xo
|
|
.Ft "enum clnt_stat"
|
|
.Xc
|
|
.It Xo
|
|
.Fo pmap_rmtcall
|
|
.Fa "struct sockaddr_in *addr"
|
|
.Fa "u_long prognum"
|
|
.Fa "u_long versnum"
|
|
.Fa "u_long procnum"
|
|
.Fa "xdrproc_t inproc"
|
|
.Fa "char *in"
|
|
.Fa "xdrproc_t outproc"
|
|
.Fa "char *out"
|
|
.Fa "struct timeval tout"
|
|
.Fa "u_long *portp"
|
|
.Fc
|
|
.Xc
|
|
.Pp
|
|
A user interface to the
|
|
.Xr portmap 8
|
|
service, which instructs
|
|
.Xr portmap 8
|
|
on the host at
|
|
.Tn IP
|
|
address
|
|
.Fa addr
|
|
to make an
|
|
.Tn RPC
|
|
call on your behalf to a procedure on that host.
|
|
The parameter
|
|
.Fa portp
|
|
will be modified to the program's port number if the
|
|
procedure
|
|
succeeds.
|
|
The definitions of other parameters are discussed
|
|
in
|
|
.Fn callrpc
|
|
and
|
|
.Fn clnt_call .
|
|
This procedure should be used for a
|
|
.Dq ping
|
|
and nothing
|
|
else.
|
|
See also
|
|
.Fn clnt_broadcast .
|
|
.Pp
|
|
.It Xo
|
|
.Ft bool_t
|
|
.Fn pmap_set "u_long prognum" "u_long versnum" "u_long protocol" "u_short port"
|
|
.Xc
|
|
.Pp
|
|
A user interface to the
|
|
.Xr portmap 8
|
|
service, which establishes a mapping between the triple
|
|
.Pq Fa prognum , versnum , protocol
|
|
and
|
|
.Fa port
|
|
on the machine's
|
|
.Xr portmap 8
|
|
service.
|
|
The value of
|
|
.Fa protocol
|
|
is most likely
|
|
.Dv IPPROTO_UDP
|
|
or
|
|
.Dv IPPROTO_TCP .
|
|
This routine returns one if it succeeds, zero otherwise.
|
|
Automatically done by
|
|
.Fn svc_register .
|
|
.Pp
|
|
.It Xo
|
|
.Ft bool_t
|
|
.Fn pmap_unset "u_long prognum" "u_long versnum"
|
|
.Xc
|
|
.Pp
|
|
A user interface to the
|
|
.Xr portmap 8
|
|
service, which destroys all mapping between the triple
|
|
.Pq Fa prognum , versnum , *
|
|
and
|
|
.Fa ports
|
|
on the machine's
|
|
.Xr portmap 8
|
|
service.
|
|
This routine returns one if it succeeds, zero
|
|
otherwise.
|
|
.Pp
|
|
.It Xo
|
|
.Ft bool_t
|
|
.Fo registerrpc
|
|
.Fa "u_long prognum"
|
|
.Fa "u_long versnum"
|
|
.Fa "u_long procnum"
|
|
.Fa "char *(*procname)(void)"
|
|
.Fa "xdrproc_t inproc"
|
|
.Fa "xdrproc_t outproc"
|
|
.Fc
|
|
.Xc
|
|
.Pp
|
|
Register procedure
|
|
.Fa procname
|
|
with the
|
|
.Tn RPC
|
|
service package.
|
|
If a request arrives for program
|
|
.Fa prognum ,
|
|
version
|
|
.Fa versnum ,
|
|
and procedure
|
|
.Fa procnum ,
|
|
.Fa procname
|
|
is called with a pointer to its parameter(s);
|
|
.Fa progname
|
|
should return a pointer to its static result(s);
|
|
.Fa inproc
|
|
is used to decode the parameters while
|
|
.Fa outproc
|
|
is used to encode the results.
|
|
This routine returns zero if the registration succeeded, \-1
|
|
otherwise.
|
|
.Pp
|
|
Warning: remote procedures registered in this form
|
|
are accessed using the
|
|
.Tn UDP/IP
|
|
transport; see
|
|
.Fn svcudp_create
|
|
for restrictions.
|
|
.Pp
|
|
.It Xo
|
|
.Vt "struct rpc_createerr" rpc_createerr ;
|
|
.Xc
|
|
.Pp
|
|
A global variable whose value is set by any
|
|
.Tn RPC
|
|
client creation routine
|
|
that does not succeed.
|
|
Use the routine
|
|
.Fn clnt_pcreateerror
|
|
to print the reason why.
|
|
.Pp
|
|
.It Xo
|
|
.Ft bool_t
|
|
.Fn svc_destroy "SVCXPRT * xprt"
|
|
.Xc
|
|
.Pp
|
|
A macro that destroys the
|
|
.Tn RPC
|
|
service transport handle,
|
|
.Fa xprt .
|
|
Destruction usually involves deallocation
|
|
of private data structures, including
|
|
.Fa xprt
|
|
itself.
|
|
Use of
|
|
.Fa xprt
|
|
is undefined after calling this routine.
|
|
.Pp
|
|
.It Xo
|
|
.Vt fd_set svc_fdset ;
|
|
.Xc
|
|
.Pp
|
|
A global variable reflecting the
|
|
.Tn RPC
|
|
service side's
|
|
read file descriptor bit mask; it is suitable as a template parameter
|
|
to the
|
|
.Xr select 2
|
|
system call.
|
|
This is only of interest
|
|
if a service implementor does not call
|
|
.Fn svc_run ,
|
|
but rather does his own asynchronous event processing.
|
|
This variable is read\-only (do not pass its address to
|
|
.Xr select 2 ! ) ,
|
|
yet it may change after calls to
|
|
.Fn svc_getreqset
|
|
or any creation routines.
|
|
As well, note that if the process has descriptor limits
|
|
which are extended beyond
|
|
.Dv FD_SETSIZE ,
|
|
this variable will only be usable for the first
|
|
.Dv FD_SETSIZE
|
|
descriptors.
|
|
.Pp
|
|
.It Xo
|
|
.Vt int svc_fds ;
|
|
.Xc
|
|
.Pp
|
|
Similar to
|
|
.Va svc_fdset ,
|
|
but limited to 32 descriptors.
|
|
This
|
|
interface is obsoleted by
|
|
.Va svc_fdset .
|
|
.Pp
|
|
.It Xo
|
|
.Ft bool_t
|
|
.Fn svc_freeargs "SVCXPRT *xprt" "xdrproc_t inproc" "char *in"
|
|
.Xc
|
|
.Pp
|
|
A macro that frees any data allocated by the
|
|
.Tn RPC/XDR
|
|
system when it decoded the arguments to a service procedure
|
|
using
|
|
.Fn svc_getargs .
|
|
This routine returns 1 if the results were successfully
|
|
freed,
|
|
and zero otherwise.
|
|
.Pp
|
|
.It Xo
|
|
.Ft bool_t
|
|
.Fn svc_getargs "SVCXPRT *xprt" "xdrproc_t inproc" "char *in"
|
|
.Xc
|
|
.Pp
|
|
A macro that decodes the arguments of an
|
|
.Tn RPC
|
|
request
|
|
associated with the
|
|
.Tn RPC
|
|
service transport handle,
|
|
.Fa xprt .
|
|
The parameter
|
|
.Fa in
|
|
is the address where the arguments will be placed;
|
|
.Fa inproc
|
|
is the
|
|
.Tn XDR
|
|
routine used to decode the arguments.
|
|
This routine returns one if decoding succeeds, and zero
|
|
otherwise.
|
|
.Pp
|
|
.It Xo
|
|
.Ft "struct sockaddr_in *"
|
|
.Xc
|
|
.It Xo
|
|
.Fn svc_getcaller "SVCXPRT *xprt"
|
|
.Xc
|
|
.Pp
|
|
The approved way of getting the network address of the caller
|
|
of a procedure associated with the
|
|
.Tn RPC
|
|
service transport handle,
|
|
.Fa xprt .
|
|
.Pp
|
|
.It Xo
|
|
.Ft void
|
|
.Fn svc_getreqset "fd_set *rdfds"
|
|
.Xc
|
|
.Pp
|
|
This routine is only of interest if a service implementor
|
|
does not call
|
|
.Fn svc_run ,
|
|
but instead implements custom asynchronous event processing.
|
|
It is called when the
|
|
.Xr select 2
|
|
system call has determined that an
|
|
.Tn RPC
|
|
request has arrived on some
|
|
.Tn RPC
|
|
socket(s);
|
|
.Fa rdfds
|
|
is the resultant read file descriptor bit mask.
|
|
The routine returns when all sockets associated with the
|
|
value of
|
|
.Fa rdfds
|
|
have been serviced.
|
|
.Pp
|
|
.It Xo
|
|
.Ft void
|
|
.Fn svc_getreq "int rdfds"
|
|
.Xc
|
|
.Pp
|
|
Similar to
|
|
.Fn svc_getreqset ,
|
|
but limited to 32 descriptors.
|
|
This interface is obsoleted by
|
|
.Fn svc_getreqset .
|
|
.Pp
|
|
.It Xo
|
|
.Ft bool_t
|
|
.Fo svc_register
|
|
.Fa "SVCXPRT *xprt"
|
|
.Fa "u_long prognum"
|
|
.Fa "u_long versnum"
|
|
.Fa "void (*dispatch)(struct svc_req *, SVCXPRT *)"
|
|
.Fa "int protocol"
|
|
.Fc
|
|
.Xc
|
|
.Pp
|
|
Associates
|
|
.Fa prognum
|
|
and
|
|
.Fa versnum
|
|
with the service dispatch procedure,
|
|
.Fn dispatch .
|
|
If
|
|
.Fa protocol
|
|
is zero, the service is not registered with the
|
|
.Xr portmap 8
|
|
service.
|
|
If
|
|
.Fa protocol
|
|
is non-zero, then a mapping of the triple
|
|
.Pq Fa prognum , versnum , protocol
|
|
to
|
|
.Fa xprt\->xp_port
|
|
is established with the local
|
|
.Xr portmap 8
|
|
service (generally
|
|
.Fa protocol
|
|
is zero,
|
|
.Dv IPPROTO_UDP
|
|
or
|
|
.Dv IPPROTO_TCP ) .
|
|
The procedure
|
|
.Fn dispatch
|
|
has the following form:
|
|
.Bd -ragged -offset indent
|
|
.Ft bool_t
|
|
.Fn dispatch "struct svc_req *request" "SVCXPRT *xprt"
|
|
.Ed
|
|
.Pp
|
|
The
|
|
.Fn svc_register
|
|
routine returns one if it succeeds, and zero otherwise.
|
|
.Pp
|
|
.It Xo
|
|
.Fn svc_run
|
|
.Xc
|
|
.Pp
|
|
This routine never returns.
|
|
It waits for
|
|
.Tn RPC
|
|
requests to arrive, and calls the appropriate service
|
|
procedure using
|
|
.Fn svc_getreq
|
|
when one arrives.
|
|
This procedure is usually waiting for a
|
|
.Xr select 2
|
|
system call to return.
|
|
.Pp
|
|
.It Xo
|
|
.Ft bool_t
|
|
.Fn svc_sendreply "SVCXPRT *xprt" "xdrproc_t outproc" "char *out"
|
|
.Xc
|
|
.Pp
|
|
Called by an
|
|
.Tn RPC
|
|
service's dispatch routine to send the results of a
|
|
remote procedure call.
|
|
The parameter
|
|
.Fa xprt
|
|
is the request's associated transport handle;
|
|
.Fa outproc
|
|
is the
|
|
.Tn XDR
|
|
routine which is used to encode the results; and
|
|
.Fa out
|
|
is the address of the results.
|
|
This routine returns one if it succeeds, zero otherwise.
|
|
.Pp
|
|
.It Xo
|
|
.Ft void
|
|
.Xc
|
|
.It Xo
|
|
.Fn svc_unregister "u_long prognum" "u_long versnum"
|
|
.Xc
|
|
.Pp
|
|
Remove all mapping of the double
|
|
.Pq Fa prognum , versnum
|
|
to dispatch routines, and of the triple
|
|
.Pq Fa prognum , versnum , *
|
|
to port number.
|
|
.Pp
|
|
.It Xo
|
|
.Ft void
|
|
.Xc
|
|
.It Xo
|
|
.Fn svcerr_auth "SVCXPRT *xprt" "enum auth_stat why"
|
|
.Xc
|
|
.Pp
|
|
Called by a service dispatch routine that refuses to perform
|
|
a remote procedure call due to an authentication error.
|
|
.Pp
|
|
.It Xo
|
|
.Ft void
|
|
.Xc
|
|
.It Xo
|
|
.Fn svcerr_decode "SVCXPRT *xprt"
|
|
.Xc
|
|
.Pp
|
|
Called by a service dispatch routine that cannot successfully
|
|
decode its parameters.
|
|
See also
|
|
.Fn svc_getargs .
|
|
.Pp
|
|
.It Xo
|
|
.Ft void
|
|
.Xc
|
|
.It Xo
|
|
.Fn svcerr_noproc "SVCXPRT *xprt"
|
|
.Xc
|
|
.Pp
|
|
Called by a service dispatch routine that does not implement
|
|
the procedure number that the caller requests.
|
|
.Pp
|
|
.It Xo
|
|
.Ft void
|
|
.Xc
|
|
.It Xo
|
|
.Fn svcerr_noprog "SVCXPRT *xprt"
|
|
.Xc
|
|
.Pp
|
|
Called when the desired program is not registered with the
|
|
.Tn RPC
|
|
package.
|
|
Service implementors usually do not need this routine.
|
|
.Pp
|
|
.It Xo
|
|
.Ft void
|
|
.Xc
|
|
.It Xo
|
|
.Fn svcerr_progvers "SVCXPRT *xprt" "u_long low_vers" "u_long high_vers"
|
|
.Xc
|
|
.Pp
|
|
Called when the desired version of a program is not registered
|
|
with the
|
|
.Tn RPC
|
|
package.
|
|
Service implementors usually do not need this routine.
|
|
.Pp
|
|
.It Xo
|
|
.Ft void
|
|
.Xc
|
|
.It Xo
|
|
.Fn svcerr_systemerr "SVCXPRT *xprt"
|
|
.Xc
|
|
.Pp
|
|
Called by a service dispatch routine when it detects a system
|
|
error
|
|
not covered by any particular protocol.
|
|
For example, if a service can no longer allocate storage,
|
|
it may call this routine.
|
|
.Pp
|
|
.It Xo
|
|
.Ft void
|
|
.Xc
|
|
.It Xo
|
|
.Fn svcerr_weakauth "SVCXPRT *xprt"
|
|
.Xc
|
|
.Pp
|
|
Called by a service dispatch routine that refuses to perform
|
|
a remote procedure call due to insufficient
|
|
authentication parameters.
|
|
The routine calls
|
|
.Fn svcerr_auth xprt AUTH_TOOWEAK .
|
|
.Pp
|
|
.It Xo
|
|
.Ft "SVCXPRT *"
|
|
.Xc
|
|
.It Xo
|
|
.Fn svcraw_create void
|
|
.Xc
|
|
.Pp
|
|
This routine creates a toy
|
|
.Tn RPC
|
|
service transport, to which it returns a pointer.
|
|
The transport
|
|
is really a buffer within the process's address space,
|
|
so the corresponding
|
|
.Tn RPC
|
|
client should live in the same
|
|
address space;
|
|
see
|
|
.Fn clntraw_create .
|
|
This routine allows simulation of
|
|
.Tn RPC
|
|
and acquisition of
|
|
.Tn RPC
|
|
overheads (such as round trip times), without any kernel
|
|
interference.
|
|
This routine returns
|
|
.Dv NULL
|
|
if it fails.
|
|
.Pp
|
|
.It Xo
|
|
.Ft "SVCXPRT *"
|
|
.Xc
|
|
.It Xo
|
|
.Fn svctcp_create "int sock" "u_int send_buf_size" "u_int recv_buf_size"
|
|
.Xc
|
|
.Pp
|
|
This routine creates a
|
|
.Tn TCP/IP Ns \-based
|
|
.Tn RPC
|
|
service transport, to which it returns a pointer.
|
|
The transport is associated with the socket
|
|
.Fa sock ,
|
|
which may be
|
|
.Dv RPC_ANYSOCK ,
|
|
in which case a new socket is created.
|
|
If the socket is not bound to a local
|
|
.Tn TCP
|
|
port, then this routine binds it to an arbitrary port.
|
|
Upon completion,
|
|
.Fa xprt\->xp_sock
|
|
is the transport's socket descriptor, and
|
|
.Fa xprt\->xp_port
|
|
is the transport's port number.
|
|
This routine returns
|
|
.Dv NULL
|
|
if it fails.
|
|
Since
|
|
.Tn TCP Ns \-based
|
|
.Tn RPC
|
|
uses buffered
|
|
.Tn I/O ,
|
|
users may specify the size of buffers; values of zero
|
|
choose suitable defaults.
|
|
.Pp
|
|
.It Xo
|
|
.Ft "SVCXPRT *"
|
|
.Xc
|
|
.It Xo
|
|
.Fn svcfd_create "int fd" "u_int sendsize" "u_int recvsize"
|
|
.Xc
|
|
.Pp
|
|
Create a service on top of any open descriptor.
|
|
Typically,
|
|
this
|
|
descriptor is a connected socket for a stream protocol such
|
|
as
|
|
.Tn TCP .
|
|
.Fa sendsize
|
|
and
|
|
.Fa recvsize
|
|
indicate sizes for the send and receive buffers.
|
|
If they are
|
|
zero, a reasonable default is chosen.
|
|
.Pp
|
|
.It Xo
|
|
.Ft "SVCXPRT *"
|
|
.Xc
|
|
.It Xo
|
|
.Fn svcudp_bufcreate "int sock" "u_int sendsize" "u_int recvsize"
|
|
.Xc
|
|
.Pp
|
|
This routine creates a
|
|
.Tn UDP/IP Ns \-based
|
|
.Tn RPC
|
|
service transport, to which it returns a pointer.
|
|
The transport is associated with the socket
|
|
.Fa sock ,
|
|
which may be
|
|
.Dv RPC_ANYSOCK ,
|
|
in which case a new socket is created.
|
|
If the socket is not bound to a local
|
|
.Tn UDP
|
|
port, then this routine binds it to an arbitrary port.
|
|
Upon
|
|
completion,
|
|
.Fa xprt\->xp_sock
|
|
is the transport's socket descriptor, and
|
|
.Fa xprt\->xp_port
|
|
is the transport's port number.
|
|
This routine returns
|
|
.Dv NULL
|
|
if it fails.
|
|
.Pp
|
|
This allows the user to specify the maximum packet size for sending and
|
|
receiving
|
|
.Tn UDP Ns \-based
|
|
.Tn RPC
|
|
messages.
|
|
.Pp
|
|
.It Xo
|
|
.Ft bool_t
|
|
.Fn xdr_accepted_reply "XDR *xdrs" "struct accepted_reply *ar"
|
|
.Xc
|
|
.Pp
|
|
Used for encoding
|
|
.Tn RPC
|
|
reply messages.
|
|
This routine is useful for users who
|
|
wish to generate
|
|
.Tn RPC Ns \-style
|
|
messages without using the
|
|
.Tn RPC
|
|
package.
|
|
.Pp
|
|
.It Xo
|
|
.Ft bool_t
|
|
.Fn xdr_authunix_parms "XDR *xdrs" "struct authunix_parms *aupp"
|
|
.Xc
|
|
.Pp
|
|
Used for describing
|
|
.Ux
|
|
credentials.
|
|
This routine is useful for users
|
|
who wish to generate these credentials without using the
|
|
.Tn RPC
|
|
authentication package.
|
|
.Pp
|
|
.It Xo
|
|
.Ft void
|
|
.Xc
|
|
.It Xo
|
|
.Ft bool_t
|
|
.Fn xdr_callhdr "XDR *xdrs" "struct rpc_msg *chdr"
|
|
.Xc
|
|
.Pp
|
|
Used for describing
|
|
.Tn RPC
|
|
call header messages.
|
|
This routine is useful for users who wish to generate
|
|
.Tn RPC Ns \-style
|
|
messages without using the
|
|
.Tn RPC
|
|
package.
|
|
.Pp
|
|
.It Xo
|
|
.Ft bool_t
|
|
.Fn xdr_callmsg "XDR *xdrs" "struct rpc_msg *cmsg"
|
|
.Xc
|
|
.Pp
|
|
Used for describing
|
|
.Tn RPC
|
|
call messages.
|
|
This routine is useful for users who wish to generate
|
|
.Tn RPC Ns \-style
|
|
messages without using the
|
|
.Tn RPC
|
|
package.
|
|
.Pp
|
|
.It Xo
|
|
.Ft bool_t
|
|
.Fn xdr_opaque_auth "XDR *xdrs" "struct opaque_auth *ap"
|
|
.Xc
|
|
.Pp
|
|
Used for describing
|
|
.Tn RPC
|
|
authentication information messages.
|
|
This routine is useful for users who wish to generate
|
|
.Tn RPC Ns \-style
|
|
messages without using the
|
|
.Tn RPC
|
|
package.
|
|
.Pp
|
|
.It Xo
|
|
.Fd struct pmap ;
|
|
.Ft bool_t
|
|
.Fn xdr_pmap "XDR *xdrs" "struct pmap *regs"
|
|
.Xc
|
|
.Pp
|
|
Used for describing parameters to various
|
|
.Xr portmap 8
|
|
procedures, externally.
|
|
This routine is useful for users who wish to generate
|
|
these parameters without using the
|
|
.Fn pmap_*
|
|
interface.
|
|
.Pp
|
|
.It Xo
|
|
.Ft bool_t
|
|
.Fn xdr_pmaplist "XDR *xdrs" "struct pmaplist **rp"
|
|
.Xc
|
|
.Pp
|
|
Used for describing a list of port mappings, externally.
|
|
This routine is useful for users who wish to generate
|
|
these parameters without using the
|
|
.Fn pmap_*
|
|
interface.
|
|
.Pp
|
|
.It Xo
|
|
.Ft bool_t
|
|
.Fn xdr_rejected_reply "XDR *xdrs" "struct rejected_reply *rr"
|
|
.Xc
|
|
.Pp
|
|
Used for describing
|
|
.Tn RPC
|
|
reply messages.
|
|
This routine is useful for users who wish to generate
|
|
.Tn RPC Ns \-style
|
|
messages without using the
|
|
.Tn RPC
|
|
package.
|
|
.Pp
|
|
.It Xo
|
|
.Ft bool_t
|
|
.Fn xdr_replymsg "XDR *xdrs" "struct rpc_msg *rmsg"
|
|
.Xc
|
|
.Pp
|
|
Used for describing
|
|
.Tn RPC
|
|
reply messages.
|
|
This routine is useful for users who wish to generate
|
|
.Tn RPC
|
|
style messages without using the
|
|
.Tn RPC
|
|
package.
|
|
.Pp
|
|
.It Xo
|
|
.Ft void
|
|
.Xc
|
|
.It Xo
|
|
.Fn xprt_register "SVCXPRT *xprt"
|
|
.Xc
|
|
.Pp
|
|
After
|
|
.Tn RPC
|
|
service transport handles are created,
|
|
they should register themselves with the
|
|
.Tn RPC
|
|
service package.
|
|
This routine modifies the global variable
|
|
.Va svc_fds .
|
|
Service implementors usually do not need this routine.
|
|
.Pp
|
|
.It Xo
|
|
.Ft void
|
|
.Xc
|
|
.It Xo
|
|
.Fn xprt_unregister "SVCXPRT *xprt"
|
|
.Xc
|
|
.Pp
|
|
Before an
|
|
.Tn RPC
|
|
service transport handle is destroyed,
|
|
it should unregister itself with the
|
|
.Tn RPC
|
|
service package.
|
|
This routine modifies the global variable
|
|
.Va svc_fds .
|
|
Service implementors usually do not need this routine.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr rpc_secure 3 ,
|
|
.Xr xdr 3
|
|
.Rs
|
|
.%T "Remote Procedure Calls: Protocol Specification"
|
|
.Re
|
|
.Rs
|
|
.%T "Remote Procedure Call Programming Guide"
|
|
.Re
|
|
.Rs
|
|
.%T "rpcgen Programming Guide"
|
|
.Re
|
|
.Rs
|
|
.%T "RPC: Remote Procedure Call Protocol Specification"
|
|
.%O RFC1050
|
|
.%Q "Sun Microsystems, Inc., USC-ISI"
|
|
.Re
|