lib/libc/rpc/clnt_simple.c

   1 /*      $NetBSD: clnt_simple.c,v 1.28 2006/11/03 20:18:49 christos Exp $        */
   2
   3 /*
   4  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   5  * unrestricted use provided that this legend is included on all tape
   6  * media and as a part of the software program in whole or part.  Users
   7  * may copy or modify Sun RPC without charge, but are not authorized
   8  * to license or distribute it to anyone else except as part of a product or
   9  * program developed by the user.
  10  *
  11  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  12  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  13  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  14  *
  15  * Sun RPC is provided with no support and without any obligation on the
  16  * part of Sun Microsystems, Inc. to assist in its use, correction,
  17  * modification or enhancement.
  18  *
  19  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  20  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  21  * OR ANY PART THEREOF.
  22  *
  23  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  24  * or profits or other special, indirect and consequential damages, even if
  25  * Sun has been advised of the possibility of such damages.
  26  *
  27  * Sun Microsystems, Inc.
  28  * 2550 Garcia Avenue
  29  * Mountain View, California  94043
  30  */
  31 /*
  32  * Copyright (c) 1986-1991 by Sun Microsystems Inc.
  33  */
  34
  35 /* #ident       "@(#)clnt_simple.c      1.17    94/04/24 SMI" */
  36
  37 #include <sys/cdefs.h>
  38 #if defined(LIBC_SCCS) && !defined(lint)
  39 #if 0
  40 static char sccsid[] = "@(#)clnt_simple.c 1.49 89/01/31 Copyr 1984 Sun Micro";
  41 #else
  42 __RCSID("$NetBSD: clnt_simple.c,v 1.28 2006/11/03 20:18:49 christos Exp $");
  43 #endif
  44 #endif
  45
  46 /*
  47  * clnt_simple.c
  48  * Simplified front end to client rpc.
  49  *
  50  */
  51
  52 #include "namespace.h"
  53 #include "reentrant.h"
  54 #include <sys/param.h>
  55 #include <stdio.h>
  56 #include <assert.h>
  57 #include <errno.h>
  58 #include <rpc/rpc.h>
  59 #include <string.h>
  60 #include <stdlib.h>
  61 #include <fcntl.h>
  62 #include <unistd.h>
  63
  64 #ifdef __weak_alias
  65 __weak_alias(rpc_call,_rpc_call)
  66 #endif
  67
  68 #ifndef MAXHOSTNAMELEN
  69 #define MAXHOSTNAMELEN 64
  70 #endif
  71
  72 #ifndef NETIDLEN
  73 #define NETIDLEN 32
  74 #endif
  75
  76 struct rpc_call_private {
  77         int     valid;                  /* Is this entry valid ? */
  78         CLIENT  *client;                /* Client handle */
  79         pid_t   pid;                    /* process-id at moment of creation */
  80         rpcprog_t prognum;              /* Program */
  81         rpcvers_t versnum;              /* Version */
  82         char    host[MAXHOSTNAMELEN];   /* Servers host */
  83         char    nettype[NETIDLEN];      /* Network type */
  84 };
  85 static struct rpc_call_private *rpc_call_private_main;
  86
  87 #ifdef _REENTRANT
  88 static void rpc_call_destroy __P((void *));
  89
  90 static void
  91 rpc_call_destroy(void *vp)
  92 {
  93         struct rpc_call_private *rcp = (struct rpc_call_private *)vp;
  94
  95         if (rcp) {
  96                 if (rcp->client)
  97                         CLNT_DESTROY(rcp->client);
  98                 free(rcp);
  99         }
 100 }
 101 static thread_key_t rpc_call_key;
 102 static once_t rpc_call_once = ONCE_INITIALIZER;
 103
 104 static void
 105 rpc_call_setup(void)
 106 {
 107
 108         thr_keycreate(&rpc_call_key, rpc_call_destroy);
 109 }
 110 #endif
 111
 112
 113 /*
 114  * This is the simplified interface to the client rpc layer.
 115  * The client handle is not destroyed here and is reused for
 116  * the future calls to same prog, vers, host and nettype combination.
 117  *
 118  * The total time available is 25 seconds.
 119  */
 120 enum clnt_stat
 121 rpc_call(host, prognum, versnum, procnum, inproc, in, outproc, out, nettype)
 122         const char *host;                       /* host name */
 123         rpcprog_t prognum;                      /* program number */
 124         rpcvers_t versnum;                      /* version number */
 125         rpcproc_t procnum;                      /* procedure number */
 126         xdrproc_t inproc, outproc;      /* in/out XDR procedures */
 127         const char *in;
 128         char  *out;                     /* recv/send data */
 129         const char *nettype;                    /* nettype */
 130 {
 131         struct rpc_call_private *rcp = (struct rpc_call_private *) 0;
 132         enum clnt_stat clnt_stat;
 133         struct timeval timeout, tottimeout;
 134         extern int __isthreaded;
 135
 136         _DIAGASSERT(host != NULL);
 137         /* XXX: in may be NULL ??? */
 138         /* XXX: out may be NULL ??? */
 139         /* XXX: nettype may be NULL ??? */
 140
 141 #ifdef _REENTRANT
 142         if (__isthreaded == 0) {
 143                 rcp = rpc_call_private_main;
 144         } else {
 145                 thr_once(&rpc_call_once, rpc_call_setup);
 146                 rcp = thr_getspecific(rpc_call_key);
 147         }
 148 #else
 149         rcp = rpc_call_private_main;
 150 #endif
 151         if (rcp == NULL) {
 152                 rcp = malloc(sizeof (*rcp));
 153                 if (rcp == NULL) {
 154                         rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 155                         rpc_createerr.cf_error.re_errno = errno;
 156                         return (rpc_createerr.cf_stat);
 157                 }
 158                 if (__isthreaded == 0)
 159                         rpc_call_private_main = rcp;
 160                 else
 161                         thr_setspecific(rpc_call_key, (void *) rcp);
 162                 rcp->valid = 0;
 163                 rcp->client = NULL;
 164         }
 165         if ((nettype == NULL) || (nettype[0] == 0))
 166                 nettype = "netpath";
 167         if (!(rcp->valid && rcp->pid == getpid() &&
 168                 (rcp->prognum == prognum) &&
 169                 (rcp->versnum == versnum) &&
 170                 (!strcmp(rcp->host, host)) &&
 171                 (!strcmp(rcp->nettype, nettype)))) {
 172                 int fd;
 173
 174                 rcp->valid = 0;
 175                 if (rcp->client)
 176                         CLNT_DESTROY(rcp->client);
 177                 /*
 178                  * Using the first successful transport for that type
 179                  */
 180                 rcp->client = clnt_create(host, prognum, versnum, nettype);
 181                 rcp->pid = getpid();
 182                 if (rcp->client == NULL) {
 183                         return (rpc_createerr.cf_stat);
 184                 }
 185                 /*
 186                  * Set time outs for connectionless case.  Do it
 187                  * unconditionally.  Faster than doing a t_getinfo()
 188                  * and then doing the right thing.
 189                  */
 190                 timeout.tv_usec = 0;
 191                 timeout.tv_sec = 5;
 192                 (void) CLNT_CONTROL(rcp->client,
 193                                 CLSET_RETRY_TIMEOUT, (char *)(void *)&timeout);
 194                 if (CLNT_CONTROL(rcp->client, CLGET_FD, (char *)(void *)&fd))
 195                         (void)fcntl(fd, F_SETFD, FD_CLOEXEC);
 196                 rcp->prognum = prognum;
 197                 rcp->versnum = versnum;
 198                 if ((strlen(host) < (size_t)MAXHOSTNAMELEN) &&
 199                     (strlen(nettype) < (size_t)NETIDLEN)) {
 200                         (void) strcpy(rcp->host, host);
 201                         (void) strcpy(rcp->nettype, nettype);
 202                         rcp->valid = 1;
 203                 } else {
 204                         rcp->valid = 0;
 205                 }
 206         } /* else reuse old client */
 207         tottimeout.tv_sec = 25;
 208         tottimeout.tv_usec = 0;
 209         clnt_stat = CLNT_CALL(rcp->client, procnum, inproc, in,
 210             outproc, out, tottimeout);
 211         /*
 212          * if call failed, empty cache
 213          */
 214         if (clnt_stat != RPC_SUCCESS)
 215                 rcp->valid = 0;
 216         return (clnt_stat);
 217 }