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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 <sys/errno.h>
+#include <rpc/rpc.h>
+#include <rpc/pmap_clnt.h>
+
+extern int errno;
+
+#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;
+ 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.
+ */
+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;
+ 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(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(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 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_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();
+ 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];
+#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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