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[FreeBSD/releng/9.2.git] / lib / libc / rpc / clnt_simple.c
1 /*      $NetBSD: clnt_simple.c,v 1.21 2000/07/06 03:10:34 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 #if defined(LIBC_SCCS) && !defined(lint)
36 static char *sccsid2 = "from: @(#)clnt_simple.c 1.35 87/08/11 Copyr 1984 Sun Micro";
37 static char *sccsid = "from: @(#)clnt_simple.c  2.2 88/08/01 4.0 RPCSRC";
38 #endif
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
41
42 /*
43  * clnt_simple.c
44  * Simplified front end to client rpc.
45  *
46  */
47
48 #include "namespace.h"
49 #include "reentrant.h"
50 #include <sys/param.h>
51 #include <stdio.h>
52 #include <errno.h>
53 #include <rpc/rpc.h>
54 #include <string.h>
55 #include <stdlib.h>
56 #include <fcntl.h>
57 #include <unistd.h>
58 #include "un-namespace.h"
59 #include "mt_misc.h"
60
61 #ifndef MAXHOSTNAMELEN
62 #define MAXHOSTNAMELEN 64
63 #endif
64
65 #ifndef NETIDLEN
66 #define NETIDLEN 32
67 #endif
68
69 struct rpc_call_private {
70         int     valid;                  /* Is this entry valid ? */
71         CLIENT  *client;                /* Client handle */
72         pid_t   pid;                    /* process-id at moment of creation */
73         rpcprog_t prognum;              /* Program */
74         rpcvers_t versnum;              /* Version */
75         char    host[MAXHOSTNAMELEN];   /* Servers host */
76         char    nettype[NETIDLEN];      /* Network type */
77 };
78 static struct rpc_call_private *rpc_call_private_main;
79 static thread_key_t rpc_call_key;
80 static once_t rpc_call_once = ONCE_INITIALIZER;
81 static int rpc_call_key_error;
82
83 static void rpc_call_key_init(void);
84 static void rpc_call_destroy(void *);
85
86 static void
87 rpc_call_destroy(void *vp)
88 {
89         struct rpc_call_private *rcp = (struct rpc_call_private *)vp;
90
91         if (rcp) {
92                 if (rcp->client)
93                         CLNT_DESTROY(rcp->client);
94                 free(rcp);
95         }
96 }
97
98 static void
99 rpc_call_key_init(void)
100 {
101
102         rpc_call_key_error = thr_keycreate(&rpc_call_key, rpc_call_destroy);
103 }
104
105 /*
106  * This is the simplified interface to the client rpc layer.
107  * The client handle is not destroyed here and is reused for
108  * the future calls to same prog, vers, host and nettype combination.
109  *
110  * The total time available is 25 seconds.
111  */
112 enum clnt_stat
113 rpc_call(host, prognum, versnum, procnum, inproc, in, outproc, out, nettype)
114         const char *host;                       /* host name */
115         rpcprog_t prognum;                      /* program number */
116         rpcvers_t versnum;                      /* version number */
117         rpcproc_t procnum;                      /* procedure number */
118         xdrproc_t inproc, outproc;      /* in/out XDR procedures */
119         const char *in;
120         char  *out;                     /* recv/send data */
121         const char *nettype;                    /* nettype */
122 {
123         struct rpc_call_private *rcp = (struct rpc_call_private *) 0;
124         enum clnt_stat clnt_stat;
125         struct timeval timeout, tottimeout;
126         int main_thread = 1;
127
128         if ((main_thread = thr_main())) {
129                 rcp = rpc_call_private_main;
130         } else {
131                 if (thr_once(&rpc_call_once, rpc_call_key_init) != 0 ||
132                     rpc_call_key_error != 0) {
133                         rpc_createerr.cf_stat = RPC_SYSTEMERROR;
134                         rpc_createerr.cf_error.re_errno = rpc_call_key_error;
135                         return (rpc_createerr.cf_stat);
136                 }
137                 rcp = (struct rpc_call_private *)thr_getspecific(rpc_call_key);
138         }
139         if (rcp == NULL) {
140                 rcp = malloc(sizeof (*rcp));
141                 if (rcp == NULL) {
142                         rpc_createerr.cf_stat = RPC_SYSTEMERROR;
143                         rpc_createerr.cf_error.re_errno = errno;
144                         return (rpc_createerr.cf_stat);
145                 }
146                 if (main_thread)
147                         rpc_call_private_main = rcp;
148                 else
149                         thr_setspecific(rpc_call_key, (void *) rcp);
150                 rcp->valid = 0;
151                 rcp->client = NULL;
152         }
153         if ((nettype == NULL) || (nettype[0] == 0))
154                 nettype = "netpath";
155         if (!(rcp->valid && rcp->pid == getpid() &&
156                 (rcp->prognum == prognum) &&
157                 (rcp->versnum == versnum) &&
158                 (!strcmp(rcp->host, host)) &&
159                 (!strcmp(rcp->nettype, nettype)))) {
160                 int fd;
161
162                 rcp->valid = 0;
163                 if (rcp->client)
164                         CLNT_DESTROY(rcp->client);
165                 /*
166                  * Using the first successful transport for that type
167                  */
168                 rcp->client = clnt_create(host, prognum, versnum, nettype);
169                 rcp->pid = getpid();
170                 if (rcp->client == NULL) {
171                         return (rpc_createerr.cf_stat);
172                 }
173                 /*
174                  * Set time outs for connectionless case.  Do it
175                  * unconditionally.  Faster than doing a t_getinfo()
176                  * and then doing the right thing.
177                  */
178                 timeout.tv_usec = 0;
179                 timeout.tv_sec = 5;
180                 (void) CLNT_CONTROL(rcp->client,
181                                 CLSET_RETRY_TIMEOUT, (char *)(void *)&timeout);
182                 if (CLNT_CONTROL(rcp->client, CLGET_FD, (char *)(void *)&fd))
183                         _fcntl(fd, F_SETFD, 1); /* make it "close on exec" */
184                 rcp->prognum = prognum;
185                 rcp->versnum = versnum;
186                 if ((strlen(host) < (size_t)MAXHOSTNAMELEN) &&
187                     (strlen(nettype) < (size_t)NETIDLEN)) {
188                         (void) strcpy(rcp->host, host);
189                         (void) strcpy(rcp->nettype, nettype);
190                         rcp->valid = 1;
191                 } else {
192                         rcp->valid = 0;
193                 }
194         } /* else reuse old client */
195         tottimeout.tv_sec = 25;
196         tottimeout.tv_usec = 0;
197         /*LINTED const castaway*/
198         clnt_stat = CLNT_CALL(rcp->client, procnum, inproc, (char *) in,
199             outproc, out, tottimeout);
200         /*
201          * if call failed, empty cache
202          */
203         if (clnt_stat != RPC_SUCCESS)
204                 rcp->valid = 0;
205         return (clnt_stat);
206 }