4.3BSD-UWisc/src/sys/rpc/svc.c
#ifndef lint
static char rcs_id[] =
{"$Header: svc.c,v 1.1 86/09/05 09:17:31 tadl Exp $"};
#endif not lint
/*
* RCS Info
* $Locker: tadl $
*/
/* NFSSRC @(#)svc.c 2.1 86/04/14 */
#ifndef lint
static char sccsid[] = "@(#)svc.c 1.1 86/02/03 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.
*/
#ifdef KERNEL
#include "../h/param.h"
#include "../h/socket.h"
#include "../h/socketvar.h"
#include "../netinet/in.h"
#include "../rpc/types.h"
#include "../rpc/xdr.h"
#include "../rpc/auth.h"
#include "../rpc/clnt.h"
#include "../rpc/rpc_msg.h"
#include "../rpc/svc.h"
#include "../rpc/svc_auth.h"
#include "../h/time.h"
char *kmem_alloc();
caddr_t rqcred_head; /* head of cashed, free authentication parameters */
#else
#include "types.h" /* <> */
#include <sys/errno.h>
#include <sys/time.h>
#include <netinet/in.h>
#include "xdr.h" /* <> */
#include "auth.h" /* <> */
#include "clnt.h" /* <> */
#include "rpc_msg.h" /* <> */
#include "svc.h" /* <> */
#include "svc_auth.h" /* <> */
#include "pmap_clnt.h" /* <make kernel depend happy> */
#define NOFILE 32
static SVCXPRT *xports[NOFILE];
int svc_fds;
extern errno;
char *malloc();
#endif
#define NULL_SVC ((struct svc_callout *)0)
#define RQCRED_SIZE 400
/*
* 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;
u_long sc_prog;
u_long sc_vers;
void (*sc_dispatch)();
} *svc_head;
static struct svc_callout *svc_find();
/* *************** SVCXPRT related stuff **************** */
/*
* Activate a transport handle.
*/
#ifdef KERNEL
/*ARGSUSED*/
#endif
void
xprt_register(xprt)
SVCXPRT *xprt;
{
#ifndef KERNEL
register int sock = xprt->xp_sock;
if (sock < NOFILE) {
xports[sock] = xprt;
svc_fds |= (1 << sock);
}
#endif
}
/*
* De-activate a transport handle.
*/
#ifndef KERNEL
void
xprt_unregister(xprt)
SVCXPRT *xprt;
{
register int sock = xprt->xp_sock;
if ((sock < NOFILE) && (xports[sock] == xprt)) {
xports[sock] = (SVCXPRT *)0;
svc_fds &= ~(1 << sock);
}
}
#endif
/* ********************** 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.
*/
#ifdef KERNEL
/*ARGSUSED*/
#endif
bool_t
svc_register(xprt, prog, vers, dispatch, protocol)
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));
#ifndef KERNEL
if (s == (struct svc_callout *)0) {
return (FALSE);
}
#endif
s->sc_prog = prog;
s->sc_vers = vers;
s->sc_dispatch = dispatch;
s->sc_next = svc_head;
svc_head = s;
pmap_it:
#ifndef KERNEL
/* now register the information with the local binder service */
if (protocol) {
return (pmap_set(prog, vers, protocol, xprt->xp_port));
}
#endif
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));
#ifndef KERNEL
/* now unregister the information with the local binder service */
(void)pmap_unset(prog, vers);
#endif
}
/*
* Search the callout list for a program number, return the callout
* struct.
*/
static struct svc_callout *
svc_find(prog, vers, prev)
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 two assumptions: a) the structure is contiguous (no pointers), and
* b) the 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
#ifdef KERNEL
svc_getreq(xprt)
register SVCXPRT *xprt;
#else
svc_getreq(rdfds)
int rdfds;
#endif
{
register enum xprt_stat stat;
struct rpc_msg msg;
int prog_found;
u_long low_vers;
u_long high_vers;
struct svc_req r;
#ifndef KERNEL
register int sock;
register int readfds = rdfds & svc_fds;
register SVCXPRT *xprt;
char cred_area[2*MAX_AUTH_BYTES + RQCRED_SIZE];
#else
char *cred_area; /* too big to allocate on call stack */
/*
* Firstly, allocate the authentication parameters' storage
*/
if (rqcred_head) {
cred_area = rqcred_head;
rqcred_head = *(caddr_t *)rqcred_head;
} else {
cred_area = mem_alloc(2*MAX_AUTH_BYTES + RQCRED_SIZE);
}
#endif
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]);
#ifndef KERNEL
for (sock = 0; readfds != 0; sock++, readfds >>= 1) {
if ((readfds & 1) != 0) {
/* sock has input waiting */
xprt = xports[sock];
#endif
/* 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);
#ifndef KERNEL
}
}
#else
/*
* free authentication parameters' storage
*/
*(caddr_t *)cred_area = rqcred_head;
rqcred_head = cred_area;
#endif
}
/*
* This is the rpc server side idle loop
* Wait for input, call server program.
*/
#ifdef KERNEL
int Rpccnt;
void
svc_run(xprt)
SVCXPRT *xprt;
{
int s;
while (TRUE) {
s = splnet();
while (xprt->xp_sock->so_rcv.sb_cc == 0)
sbwait(&xprt->xp_sock->so_rcv);
(void) splx(s);
svc_getreq(xprt);
Rpccnt++;
}
}
#else
void
svc_run()
{
int readfds;
while (TRUE) {
readfds = svc_fds;
switch (select(32, &readfds, (int *)0, (int *)0,
(struct timeval *)0)) {
case -1:
if (errno == EINTR)
continue;
else {
perror("svc.c: - Select failed");
return;
}
case 0:
continue;
default:
svc_getreq(readfds);
}
}
}
#endif