sunrpc/clnt_gen.c

   1 /*
   2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3  * unrestricted use provided that this legend is included on all tape
   4  * media and as a part of the software program in whole or part.  Users
   5  * may copy or modify Sun RPC without charge, but are not authorized
   6  * to license or distribute it to anyone else except as part of a product or
   7  * program developed by the user.
   8  *
   9  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  10  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  11  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  12  *
  13  * Sun RPC is provided with no support and without any obligation on the
  14  * part of Sun Microsystems, Inc. to assist in its use, correction,
  15  * modification or enhancement.
  16  *
  17  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  18  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  19  * OR ANY PART THEREOF.
  20  *
  21  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  22  * or profits or other special, indirect and consequential damages, even if
  23  * Sun has been advised of the possibility of such damages.
  24  *
  25  * Sun Microsystems, Inc.
  26  * 2550 Garcia Avenue
  27  * Mountain View, California  94043
  28  */
  29 /*
  30  * Copyright (C) 1987, Sun Microsystems, Inc.
  31  */
  32
  33 #include <alloca.h>
  34 #include <errno.h>
  35 #include <string.h>
  36 #include <rpc/rpc.h>
  37 #include <sys/socket.h>
  38 #include <sys/errno.h>
  39 #include <netdb.h>
  40
  41 /*
  42  * Generic client creation: takes (hostname, program-number, protocol) and
  43  * returns client handle. Default options are set, which the user can
  44  * change using the rpc equivalent of ioctl()'s.
  45  */
  46 CLIENT *
  47 clnt_create (const char *hostname, u_long prog, u_long vers,
  48              const char *proto)
  49 {
  50   struct hostent hostbuf, *h;
  51   size_t hstbuflen;
  52   char *hsttmpbuf;
  53   struct protoent protobuf, *p;
  54   size_t prtbuflen;
  55   char *prttmpbuf;
  56   struct sockaddr_in sin;
  57   struct sockaddr_un sun;
  58   int sock;
  59   struct timeval tv;
  60   CLIENT *client;
  61   int herr;
  62
  63   if (strcmp (proto, "unix") == 0)
  64     {
  65       __bzero ((char *)&sun, sizeof (sun));
  66       sun.sun_family = AF_UNIX;
  67       strcpy (sun.sun_path, hostname);
  68       sock = RPC_ANYSOCK;
  69       client = clntunix_create (&sun, prog, vers, &sock, 0, 0);
  70       if (client == NULL)
  71         return NULL;
  72       tv.tv_sec = 25;
  73       tv.tv_usec = 0;
  74       clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
  75       return client;
  76     }
  77
  78   hstbuflen = 1024;
  79   hsttmpbuf = __alloca (hstbuflen);
  80   while (__gethostbyname_r (hostname, &hostbuf, hsttmpbuf, hstbuflen,
  81                             &h, &herr) < 0)
  82     if (herr != NETDB_INTERNAL || errno != ERANGE)
  83       {
  84         rpc_createerr.cf_stat = RPC_UNKNOWNHOST;
  85         return NULL;
  86       }
  87     else
  88       {
  89         /* Enlarge the buffer.  */
  90         hstbuflen *= 2;
  91         hsttmpbuf = __alloca (hstbuflen);
  92       }
  93
  94   if (h->h_addrtype != AF_INET)
  95     {
  96       /*
  97        * Only support INET for now
  98        */
  99       rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 100       rpc_createerr.cf_error.re_errno = EAFNOSUPPORT;
 101       return NULL;
 102     }
 103   sin.sin_family = h->h_addrtype;
 104   sin.sin_port = 0;
 105   __bzero (sin.sin_zero, sizeof (sin.sin_zero));
 106   bcopy (h->h_addr, (char *) &sin.sin_addr, h->h_length);
 107
 108   prtbuflen = 1024;
 109   prttmpbuf = __alloca (prtbuflen);
 110   while (__getprotobyname_r (proto, &protobuf, prttmpbuf, prtbuflen, &p)
 111          < 0)
 112     if (errno != ERANGE)
 113       {
 114         rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 115         rpc_createerr.cf_error.re_errno = EPFNOSUPPORT;
 116         return NULL;
 117       }
 118     else
 119       {
 120         /* Enlarge the buffer.  */
 121         prtbuflen *= 2;
 122         prttmpbuf = __alloca (prtbuflen);
 123       }
 124
 125   sock = RPC_ANYSOCK;
 126   switch (p->p_proto)
 127     {
 128     case IPPROTO_UDP:
 129       tv.tv_sec = 5;
 130       tv.tv_usec = 0;
 131       client = clntudp_create (&sin, prog, vers, tv, &sock);
 132       if (client == NULL)
 133         {
 134           return NULL;
 135         }
 136       tv.tv_sec = 25;
 137       clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
 138       break;
 139     case IPPROTO_TCP:
 140       client = clnttcp_create (&sin, prog, vers, &sock, 0, 0);
 141       if (client == NULL)
 142         {
 143           return NULL;
 144         }
 145       tv.tv_sec = 25;
 146       tv.tv_usec = 0;
 147       clnt_control (client, CLSET_TIMEOUT, (char *)&tv);
 148       break;
 149     default:
 150       rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 151       rpc_createerr.cf_error.re_errno = EPFNOSUPPORT;
 152       return (NULL);
 153     }
 154   return client;
 155 }