sunrpc/clnt_gen.c

   1 /*
   2  * Copyright (c) 2010, Oracle America, Inc.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  *     * Redistributions of source code must retain the above copyright
   9  *       notice, this list of conditions and the following disclaimer.
  10  *     * Redistributions in binary form must reproduce the above
  11  *       copyright notice, this list of conditions and the following
  12  *       disclaimer in the documentation and/or other materials
  13  *       provided with the distribution.
  14  *     * Neither the name of the "Oracle America, Inc." nor the names of its
  15  *       contributors may be used to endorse or promote products derived
  16  *       from this software without specific prior written permission.
  17  *
  18  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  21  *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  22  *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  23  *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  25  *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  27  *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  28  *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <alloca.h>
  33 #include <errno.h>
  34 #include <string.h>
  35 #include <rpc/rpc.h>
  36 #include <sys/socket.h>
  37 #include <netdb.h>
  38
  39 /*
  40  * Generic client creation: takes (hostname, program-number, protocol) and
  41  * returns client handle. Default options are set, which the user can
  42  * change using the rpc equivalent of ioctl()'s.
  43  */
  44 CLIENT *
  45 clnt_create (const char *hostname, u_long prog, u_long vers,
  46              const char *proto)
  47 {
  48   struct protoent protobuf, *p;
  49   size_t prtbuflen;
  50   char *prttmpbuf;
  51   struct sockaddr_in sin;
  52   struct sockaddr_un sun;
  53   int sock;
  54   struct timeval tv;
  55   CLIENT *client;
  56
  57   if (strcmp (proto, "unix") == 0)
  58     {
  59       __bzero ((char *)&sun, sizeof (sun));
  60       sun.sun_family = AF_UNIX;
  61       strcpy (sun.sun_path, hostname);
  62       sock = RPC_ANYSOCK;
  63       client = clntunix_create (&sun, prog, vers, &sock, 0, 0);
  64       if (client == NULL)
  65         return NULL;
  66 #if 0
  67       /* This is not wanted.  This would disable the user from having
  68          a timeout in the clnt_call() call.  Only a call to cnlt_control()
  69          by the user should set the timeout value.  */
  70       tv.tv_sec = 25;
  71       tv.tv_usec = 0;
  72       clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
  73 #endif
  74       return client;
  75     }
  76
  77   if (__libc_rpc_gethostbyname (hostname, &sin) != 0)
  78     return NULL;
  79
  80   prtbuflen = 1024;
  81   prttmpbuf = __alloca (prtbuflen);
  82   while (__getprotobyname_r (proto, &protobuf, prttmpbuf, prtbuflen, &p) != 0
  83          || p == NULL)
  84     if (errno != ERANGE)
  85       {
  86         struct rpc_createerr *ce = &get_rpc_createerr ();
  87         ce->cf_stat = RPC_UNKNOWNPROTO;
  88         ce->cf_error.re_errno = EPFNOSUPPORT;
  89         return NULL;
  90       }
  91     else
  92       {
  93         /* Enlarge the buffer.  */
  94         prtbuflen *= 2;
  95         prttmpbuf = __alloca (prtbuflen);
  96       }
  97
  98   sock = RPC_ANYSOCK;
  99   switch (p->p_proto)
 100     {
 101     case IPPROTO_UDP:
 102       tv.tv_sec = 5;
 103       tv.tv_usec = 0;
 104       client = clntudp_create (&sin, prog, vers, tv, &sock);
 105       if (client == NULL)
 106         {
 107           return NULL;
 108         }
 109 #if 0
 110       /* This is not wanted.  This would disable the user from having
 111          a timeout in the clnt_call() call.  Only a call to cnlt_control()
 112          by the user should set the timeout value.  */
 113       tv.tv_sec = 25;
 114       clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
 115 #endif
 116       break;
 117     case IPPROTO_TCP:
 118       client = clnttcp_create (&sin, prog, vers, &sock, 0, 0);
 119       if (client == NULL)
 120         {
 121           return NULL;
 122         }
 123 #if 0
 124       /* This is not wanted.  This would disable the user from having
 125          a timeout in the clnt_call() call.  Only a call to cnlt_control()
 126          by the user should set the timeout value.  */
 127       tv.tv_sec = 25;
 128       tv.tv_usec = 0;
 129       clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
 130 #endif
 131       break;
 132     default:
 133       {
 134         struct rpc_createerr *ce = &get_rpc_createerr ();
 135         ce->cf_stat = RPC_SYSTEMERROR;
 136         ce->cf_error.re_errno = EPFNOSUPPORT;
 137       }
 138       return (NULL);
 139     }
 140   return client;
 141 }
 142 #ifdef EXPORT_RPC_SYMBOLS
 143 libc_hidden_def (clnt_create)
 144 #else
 145 libc_hidden_nolink_sunrpc (clnt_create, GLIBC_2_0)
 146 #endif