lib/libc/rpc/clnt_simple.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  * @(#)clnt_simple.c 1.35 87/08/11 Copyr 1984 Sun Micro
  30  * @(#)clnt_simple.c    2.2 88/08/01 4.0 RPCSRC
  31  * $NetBSD: clnt_simple.c,v 1.21 2000/07/06 03:10:34 christos Exp $
  32  * $FreeBSD: src/lib/libc/rpc/clnt_simple.c,v 1.20 2006/02/27 22:10:59 deischen Exp $
  33  * $DragonFly: src/lib/libc/rpc/clnt_simple.c,v 1.5 2005/11/13 12:27:04 swildner Exp $
  34  */
  35 /*
  36  * Copyright (c) 1986-1991 by Sun Microsystems Inc.
  37  */
  38
  39 /*
  40  * clnt_simple.c
  41  * Simplified front end to client rpc.
  42  *
  43  */
  44
  45 #include "namespace.h"
  46 #include "reentrant.h"
  47 #include <sys/param.h>
  48 #include <stdio.h>
  49 #include <errno.h>
  50 #include <rpc/rpc.h>
  51 #include <string.h>
  52 #include <stdlib.h>
  53 #include <fcntl.h>
  54 #include <unistd.h>
  55 #include "un-namespace.h"
  56 #include "mt_misc.h"
  57
  58 #ifndef MAXHOSTNAMELEN
  59 #define MAXHOSTNAMELEN 64
  60 #endif
  61
  62 #ifndef NETIDLEN
  63 #define NETIDLEN 32
  64 #endif
  65
  66 struct rpc_call_private {
  67         int     valid;                  /* Is this entry valid ? */
  68         CLIENT  *client;                /* Client handle */
  69         pid_t   pid;                    /* process-id at moment of creation */
  70         rpcprog_t prognum;              /* Program */
  71         rpcvers_t versnum;              /* Version */
  72         char    host[MAXHOSTNAMELEN];   /* Servers host */
  73         char    nettype[NETIDLEN];      /* Network type */
  74 };
  75 static struct rpc_call_private *rpc_call_private_main;
  76
  77 static void rpc_call_destroy(void *);
  78
  79 static void
  80 rpc_call_destroy(void *vp)
  81 {
  82         struct rpc_call_private *rcp = (struct rpc_call_private *)vp;
  83
  84         if (rcp) {
  85                 if (rcp->client)
  86                         CLNT_DESTROY(rcp->client);
  87                 free(rcp);
  88         }
  89 }
  90
  91 /*
  92  * This is the simplified interface to the client rpc layer.
  93  * The client handle is not destroyed here and is reused for
  94  * the future calls to same prog, vers, host and nettype combination.
  95  *
  96  * The total time available is 25 seconds.
  97  */
  98 enum clnt_stat
  99 rpc_call(const char *host,                      /* host name */
 100         rpcprog_t prognum,                      /* program number */
 101         rpcvers_t versnum,                      /* version number */
 102         rpcproc_t procnum,                      /* procedure number */
 103         xdrproc_t inproc,
 104         const char *in,
 105         xdrproc_t outproc,                      /* in/out XDR procedures */
 106         char  *out,                             /* recv/send data */
 107         const char *nettype)                    /* nettype */
 108 {
 109         struct rpc_call_private *rcp = (struct rpc_call_private *) 0;
 110         enum clnt_stat clnt_stat;
 111         struct timeval timeout, tottimeout;
 112         static thread_key_t rpc_call_key;
 113         int main_thread = 1;
 114
 115         if ((main_thread = thr_main())) {
 116                 rcp = rpc_call_private_main;
 117         } else {
 118                 if (rpc_call_key == 0) {
 119                         mutex_lock(&tsd_lock);
 120                         if (rpc_call_key == 0)
 121                                 thr_keycreate(&rpc_call_key, rpc_call_destroy);
 122                         mutex_unlock(&tsd_lock);
 123                 }
 124                 rcp = (struct rpc_call_private *)thr_getspecific(rpc_call_key);
 125         }
 126         if (rcp == NULL) {
 127                 rcp = malloc(sizeof (*rcp));
 128                 if (rcp == NULL) {
 129                         rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 130                         rpc_createerr.cf_error.re_errno = errno;
 131                         return (rpc_createerr.cf_stat);
 132                 }
 133                 if (main_thread)
 134                         rpc_call_private_main = rcp;
 135                 else
 136                         thr_setspecific(rpc_call_key, (void *) rcp);
 137                 rcp->valid = 0;
 138                 rcp->client = NULL;
 139         }
 140         if ((nettype == NULL) || (nettype[0] == 0))
 141                 nettype = "netpath";
 142         if (!(rcp->valid && rcp->pid == getpid() &&
 143                 (rcp->prognum == prognum) &&
 144                 (rcp->versnum == versnum) &&
 145                 (!strcmp(rcp->host, host)) &&
 146                 (!strcmp(rcp->nettype, nettype)))) {
 147                 int fd;
 148
 149                 rcp->valid = 0;
 150                 if (rcp->client)
 151                         CLNT_DESTROY(rcp->client);
 152                 /*
 153                  * Using the first successful transport for that type
 154                  */
 155                 rcp->client = clnt_create(host, prognum, versnum, nettype);
 156                 rcp->pid = getpid();
 157                 if (rcp->client == NULL) {
 158                         return (rpc_createerr.cf_stat);
 159                 }
 160                 /*
 161                  * Set time outs for connectionless case.  Do it
 162                  * unconditionally.  Faster than doing a t_getinfo()
 163                  * and then doing the right thing.
 164                  */
 165                 timeout.tv_usec = 0;
 166                 timeout.tv_sec = 5;
 167                 CLNT_CONTROL(rcp->client,
 168                                 CLSET_RETRY_TIMEOUT, (char *)(void *)&timeout);
 169                 if (CLNT_CONTROL(rcp->client, CLGET_FD, (char *)(void *)&fd))
 170                         _fcntl(fd, F_SETFD, 1); /* make it "close on exec" */
 171                 rcp->prognum = prognum;
 172                 rcp->versnum = versnum;
 173                 if ((strlen(host) < (size_t)MAXHOSTNAMELEN) &&
 174                     (strlen(nettype) < (size_t)NETIDLEN)) {
 175                         strcpy(rcp->host, host);
 176                         strcpy(rcp->nettype, nettype);
 177                         rcp->valid = 1;
 178                 } else {
 179                         rcp->valid = 0;
 180                 }
 181         } /* else reuse old client */
 182         tottimeout.tv_sec = 25;
 183         tottimeout.tv_usec = 0;
 184         /*LINTED const castaway*/
 185         clnt_stat = CLNT_CALL(rcp->client, procnum, inproc, (char *) in,
 186             outproc, out, tottimeout);
 187         /*
 188          * if call failed, empty cache
 189          */
 190         if (clnt_stat != RPC_SUCCESS)
 191                 rcp->valid = 0;
 192         return (clnt_stat);
 193 }