svc.c
上传用户:nvosite88
上传日期:2007-01-17
资源大小:4983k
文件大小:13k
- /* svc.c - server-side remote procedure call interface */
- /* Copyright 1984-2000 Wind River Systems, Inc. */
- #include "copyright_wrs.h"
- /*
- * Copyright (C) 1984, Sun Microsystems, Inc.
- *
- * 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
- */
- /*
- modification history
- --------------------
- 01q,15oct01,rae merge from truestack ver 01r, base 01p (AE / 5_X)
- 01p,12oct94,ism Added Chris Ford's symptom fix for SPR#3269 (more to come)
- 01o,26may92,rrr the tree shuffle
- -changed includes to have absolute path from h/
- 01n,04oct91,rrr passed through the ansification filter
- -changed includes to have absolute path from h/
- -changed copyright notice
- 01m,25oct90,dnw removed include of utime.h.
- 01l,10may90,dnw moved moduleStatics to rpcGbl; removed init/exit routines
- changed taskModuleList to taskRpcStatics
- changed to use rpcErrnoGet instead of errnoGet
- 01k,11may90,yao added missing modification history (01j) for the last checkin.
- 01j,09may90,yao typecasted malloc to (char *).
- 01i,19apr90,hjb de-linted.
- 01h,27oct89,hjb upgraded to 4.0
- 01g,19arp89,gae added svcExit to do tidy cleanup for tasks.
- changed svcInit to return pointer to moduleStatics.
- 01f,30may88,dnw changed to v4 names.
- 01e,25apr88,gae oops! forgot name change in svc_run().
- 01d,23apr88,gae fixed svc_getreq()/svc_getreqset().
- 01c,05apr88,gae updated select() to BSD4.3, i.e. used "fd_set".
- 01b,11nov87,jlf added wrs copyright, title, mod history, etc.
- 01a,01nov87,rdc first VxWorks version
- */
- #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.
- *
- */
- #include "rpc/rpctypes.h"
- #include "errno.h"
- #include "netinet/in.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 "rpc/pmap_clnt.h"
- #include "vxWorks.h"
- #include "memLib.h"
- #include "rpc/rpcGbl.h"
- #include "memPartLib.h"
- #include "rpcLib.h"
- #include "stdio.h"
- #define NULL_SVC ((struct svc_callout *)0)
- #define RQCRED_SIZE 400
- struct svc_callout *svc_find();
- /* *************** SVCXPRT related stuff **************** */
- /*
- * Activate a transport handle.
- */
- void
- xprt_register(xprt)
- SVCXPRT *xprt;
- {
- register int sock = xprt->xp_sock;
- FAST struct svc *ms = &taskRpcStatics->svc;
- if (sock < FD_SETSIZE) {
- ms->xports[sock] = xprt;
- FD_SET(sock, &ms->svc_fdset);
- }
- }
- /*
- * De-activate a transport handle.
- */
- void
- xprt_unregister(xprt)
- SVCXPRT *xprt;
- {
- register int sock = xprt->xp_sock;
- FAST struct svc *ms = &taskRpcStatics->svc;
- if (taskRpcStatics == 0x0)
- return;
- if ((sock < FD_SETSIZE) && (ms->xports[sock] == xprt)) {
- ms->xports[sock] = (SVCXPRT *)0;
- FD_CLR(sock, &ms->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(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;
- FAST struct svc *ms = &taskRpcStatics->svc;
- 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 = ms->svc_head;
- ms->svc_head = s;
- pmap_it:
- /* now register the information with the local binder service */
- if (protocol) {
- return (pmap_set(prog, vers, (u_long) 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;
- FAST struct svc *ms = &taskRpcStatics->svc;
- if ((s = svc_find(prog, vers, &prev)) == NULL_SVC)
- return;
- if (prev == NULL_SVC) {
- ms->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.
- */
- struct svc_callout *
- svc_find(prog, vers, prev)
- u_long prog;
- u_long vers;
- struct svc_callout **prev;
- {
- register struct svc_callout *s, *p;
- FAST struct svc *ms = &taskRpcStatics->svc;
- p = NULL_SVC;
- for (s = ms->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
- svc_getreq (rdfds)
- int rdfds;
- {
- fd_set readFds; /* 4.0 */
- FD_ZERO (&readFds); /* 4.0 */
- readFds.fds_bits[0] = rdfds; /* 4.0 */
- svc_getreqset (&readFds); /* 4.0 */
- }
- void
- svc_getreqset (rdfds)
- fd_set *rdfds;
- {
- register enum xprt_stat stat;
- struct rpc_msg msg;
- int prog_found;
- u_long low_vers;
- u_long high_vers;
- struct svc_req r;
- register int sock;
- register SVCXPRT *xprt;
- /* XXX char cred_area[2*MAX_AUTH_BYTES + RQCRED_SIZE]; */
- char *cred_area = (char *) KHEAP_ALLOC(2*MAX_AUTH_BYTES + RQCRED_SIZE);
- FAST struct svc *ms = &taskRpcStatics->svc;
- fd_set readFds;
- if (cred_area == 0) /* 4.0 */
- { /* 4.0 */
- panic ("rpc: svc_getreq: out of memory.n"); /* 4.0 */
- return; /* 4.0 */
- } /* 4.0 */
- msg.rm_call.cb_cred.oa_base = cred_area; /* 4.0 */
- msg.rm_call.cb_verf.oa_base = &(cred_area[MAX_AUTH_BYTES]); /* 4.0 */
- r.rq_clntcred = &(cred_area[2*MAX_AUTH_BYTES]); /* 4.0 */
- /*
- * The following is the code that gets a list of socket ports
- * that are ready for input. In comments is the RPC 4.0 optimized
- * version that makes use of getdtablesize() and ffs() which VxWorks
- * doesn't have yet. So we use the 3.9 unoptimized version instead.
- * The code here replaces the code between MARK-A and MARK-B.
- *
- * setsize = _rpc_dtablesize(); // or just call getdtablesize ()
- * maskp = (u_long *) readFds->fds_bits;
- * 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];
- */
- /* MARK-A see the comment above */
- FD_ZERO(&readFds);
- for (sock = 0; sock < FD_SETSIZE; sock++)
- if (FD_ISSET(sock, &ms->svc_fdset) && FD_ISSET(sock, rdfds))
- FD_SET(sock, &readFds);
- for (sock = 0; sock < FD_SETSIZE; sock++) {
- if (FD_ISSET(sock, &readFds)) {
- /* sock has input waiting */
- xprt = ms->xports[sock];
- /* MARK-B see the comment above */
- /* 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 = ms->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);
- }
- }
- KHEAP_FREE(cred_area);
- }
- /*
- * This is the rpc server side idle loop
- * Wait for input, call server program.
- */
- void
- svc_run()
- {
- fd_set readFds;
- FAST struct svc *ms = &taskRpcStatics->svc;
- while (TRUE) {
- readFds = ms->svc_fdset;
- switch (select (FD_SETSIZE, &readFds, (fd_set *)NULL,
- (fd_set *)NULL, (struct timeval *)0))
- {
- case -1:
- if (rpcErrnoGet () == EINTR)
- continue;
- else {
- perror("svc.c: - Select failed");
- return;
- }
- case 0:
- continue;
- default:
- svc_getreqset (&readFds);
- }
- }
- }