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
  47 struct proglst_
  48   {
  49     char *(*p_progname) (char *);
  50     int p_prognum;
  51     int p_procnum;
  52     xdrproc_t p_inproc, p_outproc;
  53     struct proglst_ *p_nxt;
  54   };
  55 #ifdef _RPC_THREAD_SAFE_
  56 #define proglst RPC_THREAD_VARIABLE(svcsimple_proglst_s)
  57 #else
  58 static struct proglst_ *proglst;
  59 #endif
  60
  61
  62 static void universal (struct svc_req *rqstp, SVCXPRT *transp_s);
  63 #ifdef _RPC_THREAD_SAFE_
  64 #define transp RPC_THREAD_VARIABLE(svcsimple_transp_s)
  65 #else
  66 static SVCXPRT *transp;
  67 #endif
  68
  69 int
  70 __registerrpc (u_long prognum, u_long versnum, u_long procnum,
  71                char *(*progname) (char *), xdrproc_t inproc, xdrproc_t outproc)
  72 {
  73   struct proglst_ *pl;
  74   char *buf;
  75
  76   if (procnum == NULLPROC)
  77     {
  78
  79       if (__asprintf (&buf, _("can't reassign procedure number %ld\n"),
  80                       NULLPROC) < 0)
  81         buf = NULL;
  82       goto err_out;
  83     }
  84   if (transp == 0)
  85     {
  86       transp = svcudp_create (RPC_ANYSOCK);
  87       if (transp == NULL)
  88         {
  89           buf = strdup (_("couldn't create an rpc server\n"));
  90           goto err_out;
  91         }
  92     }
  93   (void) pmap_unset ((u_long) prognum, (u_long) versnum);
  94   if (!svc_register (transp, (u_long) prognum, (u_long) versnum,
  95                      universal, IPPROTO_UDP))
  96     {
  97       if (__asprintf (&buf, _("couldn't register prog %ld vers %ld\n"),
  98                       prognum, versnum) < 0)
  99         buf = NULL;
 100       goto err_out;
 101     }
 102   pl = (struct proglst_ *) malloc (sizeof (struct proglst_));
 103   if (pl == NULL)
 104     {
 105       buf = strdup (_("registerrpc: out of memory\n"));
 106       goto err_out;
 107     }
 108   pl->p_progname = progname;
 109   pl->p_prognum = prognum;
 110   pl->p_procnum = procnum;
 111   pl->p_inproc = inproc;
 112   pl->p_outproc = outproc;
 113   pl->p_nxt = proglst;
 114   proglst = pl;
 115   return 0;
 116
 117  err_out:
 118   if (buf == NULL)
 119     return -1;
 120   (void) __fxprintf (NULL, "%s", buf);
 121   free (buf);
 122   return -1;
 123 }
 124 compat_symbol (libc, __registerrpc, registerrpc, GLIBC_2_0);
 125
 126 static void
 127 universal (struct svc_req *rqstp, SVCXPRT *transp_l)
 128 {
 129   int prog, proc;
 130   char *outdata;
 131   char xdrbuf[UDPMSGSIZE];
 132   struct proglst_ *pl;
 133   char *buf = NULL;
 134
 135   /*
 136    * enforce "procnum 0 is echo" convention
 137    */
 138   if (rqstp->rq_proc == NULLPROC)
 139     {
 140       if (svc_sendreply (transp_l, (xdrproc_t)xdr_void,
 141                          (char *) NULL) == FALSE)
 142         {
 143           __write (STDERR_FILENO, "xxx\n", 4);
 144           exit (1);
 145         }
 146       return;
 147     }
 148   prog = rqstp->rq_prog;
 149   proc = rqstp->rq_proc;
 150   for (pl = proglst; pl != NULL; pl = pl->p_nxt)
 151     if (pl->p_prognum == prog && pl->p_procnum == proc)
 152       {
 153         /* decode arguments into a CLEAN buffer */
 154         __bzero (xdrbuf, sizeof (xdrbuf));      /* required ! */
 155         if (!svc_getargs (transp_l, pl->p_inproc, xdrbuf))
 156           {
 157             svcerr_decode (transp_l);
 158             return;
 159           }
 160         outdata = (*(pl->p_progname)) (xdrbuf);
 161         if (outdata == NULL && pl->p_outproc != (xdrproc_t)xdr_void)
 162           /* there was an error */
 163           return;
 164         if (!svc_sendreply (transp_l, pl->p_outproc, outdata))
 165           {
 166             if (__asprintf (&buf, _("trouble replying to prog %d\n"),
 167                             pl->p_prognum) < 0)
 168               buf = NULL;
 169             goto err_out2;
 170           }
 171         /* free the decoded arguments */
 172         (void) svc_freeargs (transp_l, pl->p_inproc, xdrbuf);
 173         return;
 174       }
 175   if (__asprintf (&buf, _("never registered prog %d\n"), prog) < 0)
 176     buf = NULL;
 177  err_out2:
 178   if (buf == NULL)
 179     exit (1);
 180   __fxprintf (NULL, "%s", buf);
 181   free (buf);
 182   exit (1);
 183 }