sunrpc/svc_simple.c

   1 /*
   2  * svc_simple.c
   3  * Simplified front end to rpc.
   4  *
   5  * Copyright (c) 2010, Oracle America, Inc.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions are
   9  * met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above
  14  *       copyright notice, this list of conditions and the following
  15  *       disclaimer in the documentation and/or other materials
  16  *       provided with the distribution.
  17  *     * Neither the name of the "Oracle America, Inc." nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  25  *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  26  *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  28  *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  30  *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  31  *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  32  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <stdio.h>
  36 #include <string.h>
  37 #include <libintl.h>
  38 #include <unistd.h>
  39 #include <rpc/rpc.h>
  40 #include <rpc/pmap_clnt.h>
  41 #include <sys/socket.h>
  42 #include <netdb.h>
  43
  44 #ifdef USE_IN_LIBIO
  45 # include <wchar.h>
  46 # include <libio/iolibio.h>
  47 #endif
  48
  49 struct proglst_
  50   {
  51     char *(*p_progname) (char *);
  52     int p_prognum;
  53     int p_procnum;
  54     xdrproc_t p_inproc, p_outproc;
  55     struct proglst_ *p_nxt;
  56   };
  57 #ifdef _RPC_THREAD_SAFE_
  58 #define proglst RPC_THREAD_VARIABLE(svcsimple_proglst_s)
  59 #else
  60 static struct proglst_ *proglst;
  61 #endif
  62
  63
  64 static void universal (struct svc_req *rqstp, SVCXPRT *transp_s);
  65 #ifdef _RPC_THREAD_SAFE_
  66 #define transp RPC_THREAD_VARIABLE(svcsimple_transp_s)
  67 #else
  68 static SVCXPRT *transp;
  69 #endif
  70
  71 int
  72 registerrpc (u_long prognum, u_long versnum, u_long procnum,
  73              char *(*progname) (char *), xdrproc_t inproc, xdrproc_t outproc)
  74 {
  75   struct proglst_ *pl;
  76   char *buf;
  77
  78   if (procnum == NULLPROC)
  79     {
  80
  81       if (__asprintf (&buf, _("can't reassign procedure number %ld\n"),
  82                       NULLPROC) < 0)
  83         buf = NULL;
  84       goto err_out;
  85     }
  86   if (transp == 0)
  87     {
  88       transp = INTUSE(svcudp_create) (RPC_ANYSOCK);
  89       if (transp == NULL)
  90         {
  91           buf = strdup (_("couldn't create an rpc server\n"));
  92           goto err_out;
  93         }
  94     }
  95   (void) pmap_unset ((u_long) prognum, (u_long) versnum);
  96   if (!svc_register (transp, (u_long) prognum, (u_long) versnum,
  97                      universal, IPPROTO_UDP))
  98     {
  99       if (__asprintf (&buf, _("couldn't register prog %ld vers %ld\n"),
 100                       prognum, versnum) < 0)
 101         buf = NULL;
 102       goto err_out;
 103     }
 104   pl = (struct proglst_ *) malloc (sizeof (struct proglst_));
 105   if (pl == NULL)
 106     {
 107       buf = strdup (_("registerrpc: out of memory\n"));
 108       goto err_out;
 109     }
 110   pl->p_progname = progname;
 111   pl->p_prognum = prognum;
 112   pl->p_procnum = procnum;
 113   pl->p_inproc = inproc;
 114   pl->p_outproc = outproc;
 115   pl->p_nxt = proglst;
 116   proglst = pl;
 117   return 0;
 118
 119  err_out:
 120   if (buf == NULL)
 121     return -1;
 122   (void) __fxprintf (NULL, "%s", buf);
 123   free (buf);
 124   return -1;
 125 }
 126
 127 static void
 128 universal (struct svc_req *rqstp, SVCXPRT *transp_l)
 129 {
 130   int prog, proc;
 131   char *outdata;
 132   char xdrbuf[UDPMSGSIZE];
 133   struct proglst_ *pl;
 134   char *buf = NULL;
 135
 136   /*
 137    * enforce "procnum 0 is echo" convention
 138    */
 139   if (rqstp->rq_proc == NULLPROC)
 140     {
 141       if (INTUSE(svc_sendreply) (transp_l, (xdrproc_t)INTUSE(xdr_void),
 142                                  (char *) NULL) == FALSE)
 143         {
 144           __write (STDERR_FILENO, "xxx\n", 4);
 145           exit (1);
 146         }
 147       return;
 148     }
 149   prog = rqstp->rq_prog;
 150   proc = rqstp->rq_proc;
 151   for (pl = proglst; pl != NULL; pl = pl->p_nxt)
 152     if (pl->p_prognum == prog && pl->p_procnum == proc)
 153       {
 154         /* decode arguments into a CLEAN buffer */
 155         __bzero (xdrbuf, sizeof (xdrbuf));      /* required ! */
 156         if (!svc_getargs (transp_l, pl->p_inproc, xdrbuf))
 157           {
 158             INTUSE(svcerr_decode) (transp_l);
 159             return;
 160           }
 161         outdata = (*(pl->p_progname)) (xdrbuf);
 162         if (outdata == NULL && pl->p_outproc != (xdrproc_t)INTUSE(xdr_void))
 163           /* there was an error */
 164           return;
 165         if (!INTUSE(svc_sendreply) (transp_l, pl->p_outproc, outdata))
 166           {
 167             if (__asprintf (&buf, _("trouble replying to prog %d\n"),
 168                             pl->p_prognum) < 0)
 169               buf = NULL;
 170             goto err_out2;
 171           }
 172         /* free the decoded arguments */
 173         (void) svc_freeargs (transp_l, pl->p_inproc, xdrbuf);
 174         return;
 175       }
 176   if (__asprintf (&buf, _("never registered prog %d\n"), prog) < 0)
 177     buf = NULL;
 178  err_out2:
 179   if (buf == NULL)
 180     exit (1);
 181   __fxprintf (NULL, "%s", buf);
 182   free (buf);
 183   exit (1);
 184 }