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/*

 * 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 ((SVCXPRT **)((struct rtems_rpc_task_variables *)rtems_rpc_task_variables)->svc_xports)

#define xportssize (((struct rtems_rpc_task_variables *)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 (struct svc_callout *)(((struct rtems_rpc_task_variables *)rtems_rpc_task_variables)->svc_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;

        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(xprt)

        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(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;

{

        fd_set readfds;

        FD_ZERO(&readfds);

        readfds.fds_bits[0] = rdfds;

        svc_getreqset(&readfds);

}

void

svc_getreqset(readfds)

        fd_set *readfds;

{

        svc_getreqset2(readfds, FD_SETSIZE);

}

void

svc_getreqset2(readfds, width)

        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);

            }

        }

}