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 #include <wchar.h>
  45 #include <libio/iolibio.h>
  46 #include <shlib-compat.h>
  47
  48 struct proglst_
  49   {
  50     char *(*p_progname) (char *);
  51     int p_prognum;
  52     int p_procnum;
  53     xdrproc_t p_inproc, p_outproc;
  54     struct proglst_ *p_nxt;
  55   };
  56 #define proglst RPC_THREAD_VARIABLE(svcsimple_proglst_s)
  57
  58
  59 static void universal (struct svc_req *rqstp, SVCXPRT *transp_s);
  60 #define transp RPC_THREAD_VARIABLE(svcsimple_transp_s)
  61
  62 int
  63 __registerrpc (u_long prognum, u_long versnum, u_long procnum,
  64                char *(*progname) (char *), xdrproc_t inproc, xdrproc_t outproc)
  65 {
  66   struct proglst_ *pl;
  67   char *buf;
  68
  69   if (procnum == NULLPROC)
  70     {
  71
  72       if (__asprintf (&buf, _("can't reassign procedure number %ld\n"),
  73                       NULLPROC) < 0)
  74         buf = NULL;
  75       goto err_out;
  76     }
  77   if (transp == 0)
  78     {
  79       transp = svcudp_create (RPC_ANYSOCK);
  80       if (transp == NULL)
  81         {
  82           buf = __strdup (_("couldn't create an rpc server\n"));
  83           goto err_out;
  84         }
  85     }
  86   (void) pmap_unset ((u_long) prognum, (u_long) versnum);
  87   if (!svc_register (transp, (u_long) prognum, (u_long) versnum,
  88                      universal, IPPROTO_UDP))
  89     {
  90       if (__asprintf (&buf, _("couldn't register prog %ld vers %ld\n"),
  91                       prognum, versnum) < 0)
  92         buf = NULL;
  93       goto err_out;
  94     }
  95   pl = (struct proglst_ *) malloc (sizeof (struct proglst_));
  96   if (pl == NULL)
  97     {
  98       buf = __strdup (_("registerrpc: out of memory\n"));
  99       goto err_out;
 100     }
 101   pl->p_progname = progname;
 102   pl->p_prognum = prognum;
 103   pl->p_procnum = procnum;
 104   pl->p_inproc = inproc;
 105   pl->p_outproc = outproc;
 106   pl->p_nxt = proglst;
 107   proglst = pl;
 108   return 0;
 109
 110  err_out:
 111   if (buf == NULL)
 112     return -1;
 113   (void) __fxprintf (NULL, "%s", buf);
 114   free (buf);
 115   return -1;
 116 }
 117
 118 libc_sunrpc_symbol (__registerrpc, registerrpc, GLIBC_2_0)
 119
 120
 121 static void
 122 universal (struct svc_req *rqstp, SVCXPRT *transp_l)
 123 {
 124   int prog, proc;
 125   char *outdata;
 126   char xdrbuf[UDPMSGSIZE];
 127   struct proglst_ *pl;
 128   char *buf = NULL;
 129
 130   /*
 131    * enforce "procnum 0 is echo" convention
 132    */
 133   if (rqstp->rq_proc == NULLPROC)
 134     {
 135       if (svc_sendreply (transp_l, (xdrproc_t)xdr_void,
 136                          (char *) NULL) == FALSE)
 137         {
 138           __write (STDERR_FILENO, "xxx\n", 4);
 139           exit (1);
 140         }
 141       return;
 142     }
 143   prog = rqstp->rq_prog;
 144   proc = rqstp->rq_proc;
 145   for (pl = proglst; pl != NULL; pl = pl->p_nxt)
 146     if (pl->p_prognum == prog && pl->p_procnum == proc)
 147       {
 148         /* decode arguments into a CLEAN buffer */
 149         memset (xdrbuf, 0, sizeof (xdrbuf));    /* required ! */
 150         if (!svc_getargs (transp_l, pl->p_inproc, xdrbuf))
 151           {
 152             svcerr_decode (transp_l);
 153             return;
 154           }
 155         outdata = (*(pl->p_progname)) (xdrbuf);
 156         if (outdata == NULL && pl->p_outproc != (xdrproc_t)xdr_void)
 157           /* there was an error */
 158           return;
 159         if (!svc_sendreply (transp_l, pl->p_outproc, outdata))
 160           {
 161             if (__asprintf (&buf, _("trouble replying to prog %d\n"),
 162                             pl->p_prognum) < 0)
 163               buf = NULL;
 164             goto err_out2;
 165           }
 166         /* free the decoded arguments */
 167         (void) svc_freeargs (transp_l, pl->p_inproc, xdrbuf);
 168         return;
 169       }
 170   if (__asprintf (&buf, _("never registered prog %d\n"), prog) < 0)
 171     buf = NULL;
 172  err_out2:
 173   if (buf == NULL)
 174     exit (1);
 175   __fxprintf (NULL, "%s", buf);
 176   free (buf);
 177   exit (1);
 178 }