lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* |
| 2 | * clnt_simple.c |
| 3 | * Simplified front end to rpc. |
| 4 | * |
| 5 | * Copyright (c) 2010, Oracle America, Inc. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions are |
| 9 | * met: |
| 10 | * |
| 11 | * * Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * * Redistributions in binary form must reproduce the above |
| 14 | * copyright notice, this list of conditions and the following |
| 15 | * disclaimer in the documentation and/or other materials |
| 16 | * provided with the distribution. |
| 17 | * * Neither the name of the "Oracle America, Inc." nor the names of its |
| 18 | * contributors may be used to endorse or promote products derived |
| 19 | * from this software without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 22 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 23 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 24 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 25 | * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
| 26 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
| 28 | * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 29 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 30 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 31 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 32 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 33 | */ |
| 34 | |
| 35 | #include <alloca.h> |
| 36 | #include <errno.h> |
| 37 | #include <stdio.h> |
| 38 | #include <unistd.h> |
| 39 | #include <rpc/rpc.h> |
| 40 | #include <sys/socket.h> |
| 41 | #include <netdb.h> |
| 42 | #include <string.h> |
| 43 | |
| 44 | struct callrpc_private_s |
| 45 | { |
| 46 | CLIENT *client; |
| 47 | int socket; |
| 48 | u_long oldprognum, oldversnum, valid; |
| 49 | char *oldhost; |
| 50 | }; |
| 51 | #ifdef _RPC_THREAD_SAFE_ |
| 52 | #define callrpc_private RPC_THREAD_VARIABLE(callrpc_private_s) |
| 53 | #else |
| 54 | static struct callrpc_private_s *callrpc_private; |
| 55 | #endif |
| 56 | |
| 57 | int |
| 58 | callrpc (const char *host, u_long prognum, u_long versnum, u_long procnum, |
| 59 | xdrproc_t inproc, const char *in, xdrproc_t outproc, char *out) |
| 60 | { |
| 61 | struct callrpc_private_s *crp = callrpc_private; |
| 62 | struct sockaddr_in server_addr; |
| 63 | enum clnt_stat clnt_stat; |
| 64 | struct hostent hostbuf, *hp; |
| 65 | struct timeval timeout, tottimeout; |
| 66 | |
| 67 | if (crp == 0) |
| 68 | { |
| 69 | crp = (struct callrpc_private_s *) calloc (1, sizeof (*crp)); |
| 70 | if (crp == 0) |
| 71 | return 0; |
| 72 | callrpc_private = crp; |
| 73 | } |
| 74 | if (crp->oldhost == NULL) |
| 75 | { |
| 76 | crp->oldhost = malloc (256); |
| 77 | crp->oldhost[0] = 0; |
| 78 | crp->socket = RPC_ANYSOCK; |
| 79 | } |
| 80 | if (crp->valid && crp->oldprognum == prognum && crp->oldversnum == versnum |
| 81 | && strcmp (crp->oldhost, host) == 0) |
| 82 | { |
| 83 | /* reuse old client */ |
| 84 | } |
| 85 | else |
| 86 | { |
| 87 | size_t buflen; |
| 88 | char *buffer; |
| 89 | int herr; |
| 90 | |
| 91 | crp->valid = 0; |
| 92 | if (crp->socket != RPC_ANYSOCK) |
| 93 | { |
| 94 | (void) __close (crp->socket); |
| 95 | crp->socket = RPC_ANYSOCK; |
| 96 | } |
| 97 | if (crp->client) |
| 98 | { |
| 99 | clnt_destroy (crp->client); |
| 100 | crp->client = NULL; |
| 101 | } |
| 102 | |
| 103 | buflen = 1024; |
| 104 | buffer = __alloca (buflen); |
| 105 | while (__gethostbyname_r (host, &hostbuf, buffer, buflen, |
| 106 | &hp, &herr) != 0 |
| 107 | || hp == NULL) |
| 108 | if (herr != NETDB_INTERNAL || errno != ERANGE) |
| 109 | return (int) RPC_UNKNOWNHOST; |
| 110 | else |
| 111 | { |
| 112 | /* Enlarge the buffer. */ |
| 113 | buflen *= 2; |
| 114 | buffer = __alloca (buflen); |
| 115 | } |
| 116 | |
| 117 | timeout.tv_usec = 0; |
| 118 | timeout.tv_sec = 5; |
| 119 | memcpy ((char *) &server_addr.sin_addr, hp->h_addr, hp->h_length); |
| 120 | server_addr.sin_family = AF_INET; |
| 121 | server_addr.sin_port = 0; |
| 122 | if ((crp->client = clntudp_create (&server_addr, (u_long) prognum, |
| 123 | (u_long) versnum, timeout, &crp->socket)) == NULL) |
| 124 | return (int) get_rpc_createerr().cf_stat; |
| 125 | crp->valid = 1; |
| 126 | crp->oldprognum = prognum; |
| 127 | crp->oldversnum = versnum; |
| 128 | (void) strncpy (crp->oldhost, host, 255); |
| 129 | crp->oldhost[255] = '\0'; |
| 130 | } |
| 131 | tottimeout.tv_sec = 25; |
| 132 | tottimeout.tv_usec = 0; |
| 133 | clnt_stat = clnt_call (crp->client, procnum, inproc, (char *) in, |
| 134 | outproc, out, tottimeout); |
| 135 | /* |
| 136 | * if call failed, empty cache |
| 137 | */ |
| 138 | if (clnt_stat != RPC_SUCCESS) |
| 139 | crp->valid = 0; |
| 140 | return (int) clnt_stat; |
| 141 | } |
| 142 | libc_hidden_nolink_sunrpc (callrpc, GLIBC_2_0) |
| 143 | |
| 144 | #ifdef _RPC_THREAD_SAFE_ |
| 145 | void |
| 146 | __rpc_thread_clnt_cleanup (void) |
| 147 | { |
| 148 | struct callrpc_private_s *rcp = RPC_THREAD_VARIABLE(callrpc_private_s); |
| 149 | |
| 150 | if (rcp) { |
| 151 | if (rcp->client) |
| 152 | CLNT_DESTROY (rcp->client); |
| 153 | free (rcp); |
| 154 | } |
| 155 | } |
| 156 | #endif /* _RPC_THREAD_SAFE_ */ |