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glibc/sunrpc/svc.c

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/* @(#)svc.c 2.4 88/08/11 4.0 RPCSRC; from 1.44 88/02/08 SMI */
/*
* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
* unrestricted use provided that this legend is included on all tape
* media and as a part of the software program in whole or part. Users
* may copy or modify Sun RPC without charge, but are not authorized
* to license or distribute it to anyone else except as part of a product or
* program developed by the user.
*
* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
*
* Sun RPC is provided with no support and without any obligation on the
* part of Sun Microsystems, Inc. to assist in its use, correction,
* modification or enhancement.
*
* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
* OR ANY PART THEREOF.
*
* In no event will Sun Microsystems, Inc. be liable for any lost revenue
* or profits or other special, indirect and consequential damages, even if
* Sun has been advised of the possibility of such damages.
*
* Sun Microsystems, Inc.
* 2550 Garcia Avenue
* Mountain View, California 94043
*/
#if !defined(lint) && defined(SCCSIDS)
static char sccsid[] = "@(#)svc.c 1.41 87/10/13 Copyr 1984 Sun Micro";
#endif
/*
* svc.c, Server-side remote procedure call interface.
*
* There are two sets of procedures here. The xprt routines are
* for handling transport handles. The svc routines handle the
* list of service routines.
*
* Copyright (C) 1984, Sun Microsystems, Inc.
*/
#include <errno.h>
#include <rpc/rpc.h>
#include <rpc/svc.h>
#include <rpc/pmap_clnt.h>
#ifndef errno
extern int errno;
#endif
#ifdef FD_SETSIZE
static SVCXPRT **xports;
#else
#define NOFILE 32
static SVCXPRT *xports[NOFILE];
#endif /* def FD_SETSIZE */
#define NULL_SVC ((struct svc_callout *)0)
#define RQCRED_SIZE 400 /* this size is excessive */
/*
* The services list
* Each entry represents a set of procedures (an rpc program).
* The dispatch routine takes request structs and runs the
* appropriate procedure.
*/
static struct svc_callout
{
struct svc_callout *sc_next;
u_long sc_prog;
u_long sc_vers;
void (*sc_dispatch) (struct svc_req *, SVCXPRT *);
}
*svc_head;
static struct svc_callout *svc_find (u_long, u_long, struct svc_callout **);
/* *************** SVCXPRT related stuff **************** */
/*
* Activate a transport handle.
*/
void
xprt_register (SVCXPRT *xprt)
{
register int sock = xprt->xp_sock;
#ifdef FD_SETSIZE
if (xports == NULL)
{
xports = (SVCXPRT **)
mem_alloc (FD_SETSIZE * sizeof (SVCXPRT *));
}
if (sock < _rpc_dtablesize ())
{
xports[sock] = xprt;
FD_SET (sock, &svc_fdset);
}
#else
if (sock < NOFILE)
{
xports[sock] = xprt;
svc_fds |= (1 << sock);
}
#endif /* def FD_SETSIZE */
}
/*
* De-activate a transport handle.
*/
void
xprt_unregister (xprt)
SVCXPRT *xprt;
{
register int sock = xprt->xp_sock;
#ifdef FD_SETSIZE
if ((sock < _rpc_dtablesize ()) && (xports[sock] == xprt))
{
xports[sock] = (SVCXPRT *) 0;
FD_CLR (sock, &svc_fdset);
}
#else
if ((sock < NOFILE) && (xports[sock] == xprt))
{
xports[sock] = (SVCXPRT *) 0;
svc_fds &= ~(1 << sock);
}
#endif /* def FD_SETSIZE */
}
/* ********************** CALLOUT list related stuff ************* */
/*
* Add a service program to the callout list.
* The dispatch routine will be called when a rpc request for this
* program number comes in.
*/
bool_t
svc_register (SVCXPRT *xprt, u_long prog, u_long vers,
void (*dispatch) (struct svc_req *, SVCXPRT *), u_long protocol)
{
struct svc_callout *prev;
register struct svc_callout *s;
if ((s = svc_find (prog, vers, &prev)) != NULL_SVC)
{
if (s->sc_dispatch == dispatch)
goto pmap_it; /* he is registering another xptr */
return FALSE;
}
s = (struct svc_callout *) mem_alloc (sizeof (struct svc_callout));
if (s == (struct svc_callout *) 0)
{
return FALSE;
}
s->sc_prog = prog;
s->sc_vers = vers;
s->sc_dispatch = dispatch;
s->sc_next = svc_head;
svc_head = s;
pmap_it:
/* now register the information with the local binder service */
if (protocol)
{
return pmap_set (prog, vers, protocol, xprt->xp_port);
}
return TRUE;
}
/*
* Remove a service program from the callout list.
*/
void
svc_unregister (prog, vers)
u_long prog;
u_long vers;
{
struct svc_callout *prev;
register struct svc_callout *s;
if ((s = svc_find (prog, vers, &prev)) == NULL_SVC)
return;
if (prev == NULL_SVC)
{
svc_head = s->sc_next;
}
else
{
prev->sc_next = s->sc_next;
}
s->sc_next = NULL_SVC;
mem_free ((char *) s, (u_int) sizeof (struct svc_callout));
/* now unregister the information with the local binder service */
(void) pmap_unset (prog, vers);
}
/*
* Search the callout list for a program number, return the callout
* struct.
*/
static struct svc_callout *
svc_find (u_long prog, u_long vers, struct svc_callout **prev)
{
register struct svc_callout *s, *p;
p = NULL_SVC;
for (s = svc_head; s != NULL_SVC; s = s->sc_next)
{
if ((s->sc_prog == prog) && (s->sc_vers == vers))
goto done;
p = s;
}
done:
*prev = p;
return s;
}
/* ******************* REPLY GENERATION ROUTINES ************ */
/*
* Send a reply to an rpc request
*/
bool_t
svc_sendreply (xprt, xdr_results, xdr_location)
register SVCXPRT *xprt;
xdrproc_t xdr_results;
caddr_t xdr_location;
{
struct rpc_msg rply;
rply.rm_direction = REPLY;
rply.rm_reply.rp_stat = MSG_ACCEPTED;
rply.acpted_rply.ar_verf = xprt->xp_verf;
rply.acpted_rply.ar_stat = SUCCESS;
rply.acpted_rply.ar_results.where = xdr_location;
rply.acpted_rply.ar_results.proc = xdr_results;
return SVC_REPLY (xprt, &rply);
}
/*
* No procedure error reply
*/
void
svcerr_noproc (xprt)
register SVCXPRT *xprt;
{
struct rpc_msg rply;
rply.rm_direction = REPLY;
rply.rm_reply.rp_stat = MSG_ACCEPTED;
rply.acpted_rply.ar_verf = xprt->xp_verf;
rply.acpted_rply.ar_stat = PROC_UNAVAIL;
SVC_REPLY (xprt, &rply);
}
/*
* Can't decode args error reply
*/
void
svcerr_decode (xprt)
register SVCXPRT *xprt;
{
struct rpc_msg rply;
rply.rm_direction = REPLY;
rply.rm_reply.rp_stat = MSG_ACCEPTED;
rply.acpted_rply.ar_verf = xprt->xp_verf;
rply.acpted_rply.ar_stat = GARBAGE_ARGS;
SVC_REPLY (xprt, &rply);
}
/*
* Some system error
*/
void
svcerr_systemerr (xprt)
register SVCXPRT *xprt;
{
struct rpc_msg rply;
rply.rm_direction = REPLY;
rply.rm_reply.rp_stat = MSG_ACCEPTED;
rply.acpted_rply.ar_verf = xprt->xp_verf;
rply.acpted_rply.ar_stat = SYSTEM_ERR;
SVC_REPLY (xprt, &rply);
}
/*
* Authentication error reply
*/
void
svcerr_auth (xprt, why)
SVCXPRT *xprt;
enum auth_stat why;
{
struct rpc_msg rply;
rply.rm_direction = REPLY;
rply.rm_reply.rp_stat = MSG_DENIED;
rply.rjcted_rply.rj_stat = AUTH_ERROR;
rply.rjcted_rply.rj_why = why;
SVC_REPLY (xprt, &rply);
}
/*
* Auth too weak error reply
*/
void
svcerr_weakauth (xprt)
SVCXPRT *xprt;
{
svcerr_auth (xprt, AUTH_TOOWEAK);
}
/*
* Program unavailable error reply
*/
void
svcerr_noprog (xprt)
register SVCXPRT *xprt;
{
struct rpc_msg rply;
rply.rm_direction = REPLY;
rply.rm_reply.rp_stat = MSG_ACCEPTED;
rply.acpted_rply.ar_verf = xprt->xp_verf;
rply.acpted_rply.ar_stat = PROG_UNAVAIL;
SVC_REPLY (xprt, &rply);
}
/*
* Program version mismatch error reply
*/
void
svcerr_progvers (xprt, low_vers, high_vers)
register SVCXPRT *xprt;
u_long low_vers;
u_long high_vers;
{
struct rpc_msg rply;
rply.rm_direction = REPLY;
rply.rm_reply.rp_stat = MSG_ACCEPTED;
rply.acpted_rply.ar_verf = xprt->xp_verf;
rply.acpted_rply.ar_stat = PROG_MISMATCH;
rply.acpted_rply.ar_vers.low = low_vers;
rply.acpted_rply.ar_vers.high = high_vers;
SVC_REPLY (xprt, &rply);
}
/* ******************* SERVER INPUT STUFF ******************* */
/*
* Get server side input from some transport.
*
* Statement of authentication parameters management:
* This function owns and manages all authentication parameters, specifically
* the "raw" parameters (msg.rm_call.cb_cred and msg.rm_call.cb_verf) and
* the "cooked" credentials (rqst->rq_clntcred).
* However, this function does not know the structure of the cooked
* credentials, so it make the following assumptions:
* a) the structure is contiguous (no pointers), and
* b) the cred structure size does not exceed RQCRED_SIZE bytes.
* In all events, all three parameters are freed upon exit from this routine.
* The storage is trivially management on the call stack in user land, but
* is mallocated in kernel land.
*/
void
svc_getreq (rdfds)
int rdfds;
{
#ifdef FD_SETSIZE
fd_set readfds;
FD_ZERO (&readfds);
readfds.fds_bits[0] = rdfds;
svc_getreqset (&readfds);
#else
int readfds = rdfds & svc_fds;
svc_getreqset (&readfds);
#endif /* def FD_SETSIZE */
}
void
svc_getreqset (readfds)
#ifdef FD_SETSIZE
fd_set *readfds;
{
#else
int *readfds;
{
int readfds_local = *readfds;
#endif /* def FD_SETSIZE */
enum xprt_stat stat;
struct rpc_msg msg;
int prog_found;
u_long low_vers;
u_long high_vers;
struct svc_req r;
register SVCXPRT *xprt;
register u_long mask;
register int bit;
register u_int32_t *maskp;
register int setsize;
register int sock;
char cred_area[2 * MAX_AUTH_BYTES + RQCRED_SIZE];
msg.rm_call.cb_cred.oa_base = cred_area;
msg.rm_call.cb_verf.oa_base = &(cred_area[MAX_AUTH_BYTES]);
r.rq_clntcred = &(cred_area[2 * MAX_AUTH_BYTES]);
#ifdef FD_SETSIZE
setsize = _rpc_dtablesize ();
maskp = (u_int32_t *) readfds->fds_bits;
for (sock = 0; sock < setsize; sock += 32)
{
for (mask = *maskp++; bit = ffs (mask); mask ^= (1 << (bit - 1)))
{
/* sock has input waiting */
xprt = xports[sock + bit - 1];
#else
for (sock = 0; readfds_local != 0; sock++, readfds_local >>= 1)
{
if ((readfds_local & 1) != 0)
{
/* sock has input waiting */
xprt = xports[sock];
#endif /* def FD_SETSIZE */
/* now receive msgs from xprtprt (support batch calls) */
do
{
if (SVC_RECV (xprt, &msg))
{
/* now find the exported program and call it */
register struct svc_callout *s;
enum auth_stat why;
r.rq_xprt = xprt;
r.rq_prog = msg.rm_call.cb_prog;
r.rq_vers = msg.rm_call.cb_vers;
r.rq_proc = msg.rm_call.cb_proc;
r.rq_cred = msg.rm_call.cb_cred;
/* first authenticate the message */
if ((why = _authenticate (&r, &msg)) != AUTH_OK)
{
svcerr_auth (xprt, why);
goto call_done;
}
/* now match message with a registered service */
prog_found = FALSE;
low_vers = 0 - 1;
high_vers = 0;
for (s = svc_head; s != NULL_SVC; s = s->sc_next)
{
if (s->sc_prog == r.rq_prog)
{
if (s->sc_vers == r.rq_vers)
{
(*s->sc_dispatch) (&r, xprt);
goto call_done;
} /* found correct version */
prog_found = TRUE;
if (s->sc_vers < low_vers)
low_vers = s->sc_vers;
if (s->sc_vers > high_vers)
high_vers = s->sc_vers;
} /* found correct program */
}
/*
* if we got here, the program or version
* is not served ...
*/
if (prog_found)
svcerr_progvers (xprt,
low_vers, high_vers);
else
svcerr_noprog (xprt);
/* Fall through to ... */
}
call_done:
if ((stat = SVC_STAT (xprt)) == XPRT_DIED)
{
SVC_DESTROY (xprt);
break;
}
}
while (stat == XPRT_MOREREQS);
}
}
}
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