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 #ifdef _RPC_THREAD_SAFE_
  57 #define proglst RPC_THREAD_VARIABLE(svcsimple_proglst_s)
  58 #else
  59 static struct proglst_ *proglst;
  60 #endif
  61
  62
  63 static void universal (struct svc_req *rqstp, SVCXPRT *transp_s);
  64 #ifdef _RPC_THREAD_SAFE_
  65 #define transp RPC_THREAD_VARIABLE(svcsimple_transp_s)
  66 #else
  67 static SVCXPRT *transp;
  68 #endif
  69
  70 int
  71 __registerrpc (u_long prognum, u_long versnum, u_long procnum,
  72                char *(*progname) (char *), xdrproc_t inproc, xdrproc_t outproc)
  73 {
  74   struct proglst_ *pl;
  75   char *buf;
  76
  77   if (procnum == NULLPROC)
  78     {
  79
  80       if (__asprintf (&buf, _("can't reassign procedure number %ld\n"),
  81                       NULLPROC) < 0)
  82         buf = NULL;
  83       goto err_out;
  84     }
  85   if (transp == 0)
  86     {
  87       transp = svcudp_create (RPC_ANYSOCK);
  88       if (transp == NULL)
  89         {
  90           buf = strdup (_("couldn't create an rpc server\n"));
  91           goto err_out;
  92         }
  93     }
  94   (void) pmap_unset ((u_long) prognum, (u_long) versnum);
  95   if (!svc_register (transp, (u_long) prognum, (u_long) versnum,
  96                      universal, IPPROTO_UDP))
  97     {
  98       if (__asprintf (&buf, _("couldn't register prog %ld vers %ld\n"),
  99                       prognum, versnum) < 0)
 100         buf = NULL;
 101       goto err_out;
 102     }
 103   pl = (struct proglst_ *) malloc (sizeof (struct proglst_));
 104   if (pl == NULL)
 105     {
 106       buf = strdup (_("registerrpc: out of memory\n"));
 107       goto err_out;
 108     }
 109   pl->p_progname = progname;
 110   pl->p_prognum = prognum;
 111   pl->p_procnum = procnum;
 112   pl->p_inproc = inproc;
 113   pl->p_outproc = outproc;
 114   pl->p_nxt = proglst;
 115   proglst = pl;
 116   return 0;
 117
 118  err_out:
 119   if (buf == NULL)
 120     return -1;
 121   (void) __fxprintf (NULL, "%s", buf);
 122   free (buf);
 123   return -1;
 124 }
 125
 126 libc_sunrpc_symbol (__registerrpc, registerrpc, GLIBC_2_0)
 127
 128
 129 static void
 130 universal (struct svc_req *rqstp, SVCXPRT *transp_l)
 131 {
 132   int prog, proc;
 133   char *outdata;
 134   char xdrbuf[UDPMSGSIZE];
 135   struct proglst_ *pl;
 136   char *buf = NULL;
 137
 138   /*
 139    * enforce "procnum 0 is echo" convention
 140    */
 141   if (rqstp->rq_proc == NULLPROC)
 142     {
 143       if (svc_sendreply (transp_l, (xdrproc_t)xdr_void,
 144                          (char *) NULL) == FALSE)
 145         {
 146           __write (STDERR_FILENO, "xxx\n", 4);
 147           exit (1);
 148         }
 149       return;
 150     }
 151   prog = rqstp->rq_prog;
 152   proc = rqstp->rq_proc;
 153   for (pl = proglst; pl != NULL; pl = pl->p_nxt)
 154     if (pl->p_prognum == prog && pl->p_procnum == proc)
 155       {
 156         /* decode arguments into a CLEAN buffer */
 157         __bzero (xdrbuf, sizeof (xdrbuf));      /* required ! */
 158         if (!svc_getargs (transp_l, pl->p_inproc, xdrbuf))
 159           {
 160             svcerr_decode (transp_l);
 161             return;
 162           }
 163         outdata = (*(pl->p_progname)) (xdrbuf);
 164         if (outdata == NULL && pl->p_outproc != (xdrproc_t)xdr_void)
 165           /* there was an error */
 166           return;
 167         if (!svc_sendreply (transp_l, pl->p_outproc, outdata))
 168           {
 169             if (__asprintf (&buf, _("trouble replying to prog %d\n"),
 170                             pl->p_prognum) < 0)
 171               buf = NULL;
 172             goto err_out2;
 173           }
 174         /* free the decoded arguments */
 175         (void) svc_freeargs (transp_l, pl->p_inproc, xdrbuf);
 176         return;
 177       }
 178   if (__asprintf (&buf, _("never registered prog %d\n"), prog) < 0)
 179     buf = NULL;
 180  err_out2:
 181   if (buf == NULL)
 182     exit (1);
 183   __fxprintf (NULL, "%s", buf);
 184   free (buf);
 185   exit (1);
 186 }