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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

 */

/*

 * 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.

 */

#define __FORCE_GLIBC

#define _GNU_SOURCE

#include <features.h>

#include <errno.h>

#include <unistd.h>

#include "rpc_private.h"

#include <rpc/svc.h>

#include <rpc/pmap_clnt.h>

#include <sys/poll.h>

#ifdef __UCLIBC_HAS_THREADS__

#define xports ((SVCXPRT **)RPC_THREAD_VARIABLE(svc_xports_s))

#else

static SVCXPRT **xports;

#endif

#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

   appropriate procedure. */

struct svc_callout {

  struct svc_callout *sc_next;

  rpcprog_t sc_prog;

  rpcvers_t sc_vers;

  void (*sc_dispatch) (struct svc_req *, SVCXPRT *);

};

#ifdef __UCLIBC_HAS_THREADS__

#define svc_head ((struct svc_callout *)RPC_THREAD_VARIABLE(svc_head_s))

#else

static struct svc_callout *svc_head;

#endif

/* ***************  SVCXPRT related stuff **************** */

/* Activate a transport handle. */

void

xprt_register (SVCXPRT *xprt)

{

  register int sock = xprt->xp_sock;

  register int i;

  if (xports == NULL)

    {

      xports = (SVCXPRT **) malloc (_rpc_dtablesize () * sizeof (SVCXPRT *));

      if (xports == NULL) /* Don´t add handle */

        return;

    }

  if (sock < _rpc_dtablesize ())

    {

      xports[sock] = xprt;

      if (sock < FD_SETSIZE)

        FD_SET (sock, &svc_fdset);

      /* Check if we have an empty slot */

      for (i = 0; i < svc_max_pollfd; ++i)

        if (svc_pollfd[i].fd == -1)

          {

            svc_pollfd[i].fd = sock;

            svc_pollfd[i].events = (POLLIN | POLLPRI |

                                    POLLRDNORM | POLLRDBAND);

            return;

          }

      ++svc_max_pollfd;

      svc_pollfd = realloc (svc_pollfd,

                            sizeof (struct pollfd) * svc_max_pollfd);

      if (svc_pollfd == NULL) /* Out of memory */

        return;

      svc_pollfd[svc_max_pollfd - 1].fd = sock;

      svc_pollfd[svc_max_pollfd - 1].events = (POLLIN | POLLPRI |

                                               POLLRDNORM | POLLRDBAND);

    }

}

/* De-activate a transport handle. */

void

xprt_unregister (SVCXPRT *xprt)

{

  register int sock = xprt->xp_sock;

  register int i;

  if ((sock < _rpc_dtablesize ()) && (xports[sock] == xprt))

    {

      xports[sock] = (SVCXPRT *) 0;

      if (sock < FD_SETSIZE)

        FD_CLR (sock, &svc_fdset);

      for (i = 0; i < svc_max_pollfd; ++i)

        if (svc_pollfd[i].fd == sock)

          svc_pollfd[i].fd = -1;

    }

}

/* ********************** CALLOUT list related stuff ************* */

/* Search the callout list for a program number, return the callout

   struct. */

static struct svc_callout *

svc_find (rpcprog_t prog, rpcvers_t 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;

}

/* 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 (SVCXPRT * xprt, rpcprog_t prog, rpcvers_t vers,

              void (*dispatch) (struct svc_req *, SVCXPRT *),

              rpcproc_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 (rpcprog_t prog, rpcvers_t 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 */

  pmap_unset (prog, vers);

}

/* ******************* REPLY GENERATION ROUTINES  ************ */

/* Send a reply to an rpc request */

bool_t

svc_sendreply (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 (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 (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 (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 (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 (SVCXPRT *xprt)

{

  svcerr_auth (xprt, AUTH_TOOWEAK);

}

/* Program unavailable error reply */

void

svcerr_noprog (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 (register SVCXPRT *xprt, rpcvers_t low_vers,

                 rpcvers_t 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 (int rdfds)

{

  fd_set readfds;

  FD_ZERO (&readfds);

  readfds.fds_bits[0] = rdfds;

  svc_getreqset (&readfds);

}

void

svc_getreqset (fd_set *readfds)

{

  register u_int32_t mask;

  register u_int32_t *maskp;

  register int setsize;

  register int sock;

  register int bit;

  setsize = _rpc_dtablesize ();

  maskp = (u_int32_t *) readfds->fds_bits;

  for (sock = 0; sock < setsize; sock += 32)

    for (mask = *maskp++; (bit = ffs (mask)); mask ^= (1 << (bit - 1)))

      svc_getreq_common (sock + bit - 1);

}

void

svc_getreq_poll (struct pollfd *pfdp, int pollretval)

{

  register int i;

  register int fds_found;

  for (i = fds_found = 0; i < svc_max_pollfd && fds_found < pollretval; ++i)

    {

      register struct pollfd *p = &pfdp[i];

      if (p->fd != -1 && p->revents)

        {

          /* fd has input waiting */

          ++fds_found;

          if (p->revents & POLLNVAL)

            xprt_unregister (xports[p->fd]);

          else

            svc_getreq_common (p->fd);

        }

    }

}

void

svc_getreq_common (const int fd)

{

  enum xprt_stat stat;

  struct rpc_msg msg;

  register SVCXPRT *xprt;

  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]);

  xprt = xports[fd];

  /* Do we control fd? */

  if (xprt == NULL)

     return;

  /* now receive msgs from xprtprt (support batch calls) */

  do

    {

      if (SVC_RECV (xprt, &msg))

        {

          /* now find the exported program and call it */

          struct svc_callout *s;

          struct svc_req r;

          enum auth_stat why;

          rpcvers_t low_vers;

          rpcvers_t high_vers;

          int prog_found;

          r.rq_clntcred = &(cred_area[2 * MAX_AUTH_BYTES]);

          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 */

          /* Check for null flavor and bypass these calls if possible */

          if (msg.rm_call.cb_cred.oa_flavor == AUTH_NULL)

            {

              r.rq_xprt->xp_verf.oa_flavor = _null_auth.oa_flavor;

              r.rq_xprt->xp_verf.oa_length = 0;

            }

          else 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);

}

#ifdef __UCLIBC_HAS_THREADS__

void

__rpc_thread_svc_cleanup (void)

{

  struct svc_callout *svcp;

  while ((svcp = svc_head) != NULL)

    svc_unregister (svcp->sc_prog, svcp->sc_vers);

}

#endif /* __UCLIBC_HAS_THREADS__ */