/* @(#)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
#ifndef __dietlibc__
#define _XOPEN_SOURCE
#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/pmap_clnt.h>
#include <string.h>
#include <strings.h>
#include <sys/types.h>
#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
* apropriate procedure.
*/
static struct svc_callout {
struct svc_callout *sc_next;
unsigned long sc_prog;
unsigned long sc_vers;
void (*sc_dispatch) ();
} *svc_head;
static struct svc_callout *svc_find(unsigned long prog, unsigned long vers, struct svc_callout **prev);
/* *************** SVCXPRT related stuff **************** */
/*
* Activate a transport handle.
*/
void xprt_register(xprt)
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(xprt, prog, vers, dispatch, protocol)
SVCXPRT *xprt;
unsigned long prog;
unsigned long vers;
void (*dispatch) ();
rpcprot_t 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)
unsigned long prog;
unsigned 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, (unsigned 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(prog, vers, prev)
unsigned long prog;
unsigned 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;
char* 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;
unsigned long low_vers;
unsigned 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);
/*#ifdef __linux__*/
#ifdef __GLIBC__
readfds.fds_bits[0] = rdfds;
#else
readfds.fds_bits[0] = rdfds;
#endif
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;
unsigned long low_vers;
unsigned long high_vers;
struct svc_req r;
register SVCXPRT *xprt;
register unsigned long mask;
register int bit;
register unsigned long *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();
#ifdef __linux__
/*#define NFDBITS 32*/
maskp = (unsigned long *) readfds;
#else
maskp = (unsigned long *) readfds->fds_bits;
#endif
#ifndef NFDBITS
#define NFDBITS (8*sizeof(readfds->fds_bits[0]))
#endif
for (sock = 0; sock < setsize; sock += NFDBITS) {
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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