/*
* 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(LIBC_SCCS) && !defined(lint)
/*static char *sccsid = "from: @(#)svc.c 1.44 88/02/08 Copyr 1984 Sun Micro";*/
/*static char *sccsid = "from: @(#)svc.c 2.4 88/08/11 4.0 RPCSRC";*/
static char *rcsid = "$FreeBSD: src/lib/libc/rpc/svc.c,v 1.14 1999/08/28 00:00:48 peter Exp $";
#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 <string.h>
#include <stdlib.h>
#include <sys/errno.h>
#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#define xports (rtems_rpc_task_variables->svc_xports)
#define xportssize (rtems_rpc_task_variables->svc_xportssize)
#define NULL_SVC ((struct svc_callout *)0)
#define RQCRED_SIZE 400 /* this size is excessive */
#define max(a, b) (a > b ? a : b)
/*
* The services list
* Each entry represents a set of procedures (an rpc program).
* The dispatch routine takes request structs and runs the
* apropriate procedure.
*/
struct svc_callout {
struct svc_callout *sc_next;
u_long sc_prog;
u_long sc_vers;
void (*sc_dispatch)();
};
#define svc_head (rtems_rpc_task_variables->svc_svc_head)
static struct svc_callout *svc_find();
/* *************** SVCXPRT related stuff **************** */
/*
* Activate a transport handle.
*/
void
xprt_register(
SVCXPRT *xprt )
{
register int sock = xprt->xp_sock;
if (sock + 1 > __svc_fdsetsize) {
int bytes = sizeof (fd_set);
fd_set *fds;
fds = (fd_set *)malloc(bytes);
memset(fds, 0, bytes);
if (__svc_fdset) {
memcpy(fds, __svc_fdset, bytes);
free(__svc_fdset);
}
__svc_fdset = fds;
__svc_fdsetsize = bytes * NBBY;
}
if (sock < FD_SETSIZE)
FD_SET(sock, &svc_fdset);
FD_SET(sock, __svc_fdset);
if (xports == NULL || sock + 1 > xportssize) {
SVCXPRT **xp;
int size = FD_SETSIZE;
if (sock + 1 > size)
size = sock + 1;
xp = (SVCXPRT **)mem_alloc(size * sizeof(SVCXPRT *));
memset(xp, 0, size * sizeof(SVCXPRT *));
if (xports) {
memcpy(xp, xports, xportssize * sizeof(SVCXPRT *));
free(xports);
}
xportssize = size;
xports = xp;
}
xports[sock] = xprt;
svc_maxfd = max(svc_maxfd, sock);
}
/*
* De-activate a transport handle.
*/
void
xprt_unregister(
SVCXPRT *xprt )
{
register int sock = xprt->xp_sock;
if (xports[sock] == xprt) {
xports[sock] = (SVCXPRT *)0;
if (sock < FD_SETSIZE)
FD_CLR(sock, &svc_fdset);
FD_CLR(sock, __svc_fdset);
if (sock == svc_maxfd) {
for (svc_maxfd--; svc_maxfd >= 0; svc_maxfd--)
if (xports[svc_maxfd])
break;
}
/*
* XXX could use svc_maxfd as a hint to
* decrease the size of __svc_fdset
*/
}
}
/* ********************** 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)(),
int 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(
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(
register SVCXPRT *xprt,
xdrproc_t xdr_results,
void *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(
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(
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(
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(
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(
SVCXPRT *xprt )
{
svcerr_auth(xprt, AUTH_TOOWEAK);
}
/*
* Program unavailable error reply
*/
void
svcerr_noprog(
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(
register SVCXPRT *xprt,
rpcvers_t low_vers,
rpcvers_t 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(
int rdfds )
{
fd_set readfds;
FD_ZERO(&readfds);
readfds.fds_bits[0] = rdfds;
svc_getreqset(&readfds);
}
void
svc_getreqset(
fd_set *readfds )
{
svc_getreqset2(readfds, FD_SETSIZE);
}
void
svc_getreqset2(
fd_set *readfds,
int width )
{
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 int bit;
register int sock;
register fd_mask mask, *maskp;
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]);
maskp = readfds->fds_bits;
for (sock = 0; sock < width; sock += NFDBITS) {
for (mask = *maskp++; (bit = ffs(mask)); mask ^= (1 << (bit - 1))) {
/* sock has input waiting */
xprt = xports[sock + bit - 1];
if (xprt == NULL)
/* But do we control sock? */
continue;
/* 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 = (u_long) - 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);
}
}
}
