[df49c60] | 1 | /* |
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| 2 | * Sun RPC is a product of Sun Microsystems, Inc. and is provided for |
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| 3 | * unrestricted use provided that this legend is included on all tape |
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| 4 | * media and as a part of the software program in whole or part. Users |
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| 5 | * may copy or modify Sun RPC without charge, but are not authorized |
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| 6 | * to license or distribute it to anyone else except as part of a product or |
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| 7 | * program developed by the user. |
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| 8 | * |
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| 9 | * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE |
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| 10 | * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR |
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| 11 | * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. |
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| 12 | * |
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| 13 | * Sun RPC is provided with no support and without any obligation on the |
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| 14 | * part of Sun Microsystems, Inc. to assist in its use, correction, |
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| 15 | * modification or enhancement. |
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| 16 | * |
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| 17 | * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE |
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| 18 | * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC |
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| 19 | * OR ANY PART THEREOF. |
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| 20 | * |
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| 21 | * In no event will Sun Microsystems, Inc. be liable for any lost revenue |
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| 22 | * or profits or other special, indirect and consequential damages, even if |
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| 23 | * Sun has been advised of the possibility of such damages. |
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| 24 | * |
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| 25 | * Sun Microsystems, Inc. |
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| 26 | * 2550 Garcia Avenue |
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| 27 | * Mountain View, California 94043 |
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| 28 | */ |
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| 29 | |
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| 30 | #if defined(LIBC_SCCS) && !defined(lint) |
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| 31 | /*static char *sccsid = "from: @(#)clnt_unix.c 1.37 87/10/05 Copyr 1984 Sun Micro";*/ |
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| 32 | /*static char *sccsid = "from: @(#)clnt_unix.c 2.2 88/08/01 4.0 RPCSRC";*/ |
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| 33 | static char *rcsid = "$FreeBSD: src/lib/libc/rpc/clnt_unix.c,v 1.5 2000/01/27 23:06:37 jasone Exp $"; |
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| 34 | #endif |
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| 35 | |
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| 36 | /* |
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| 37 | * clnt_unix.c, Implements a AF_UNIX based, client side RPC. |
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| 38 | * |
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| 39 | * Copyright (C) 1984, Sun Microsystems, Inc. |
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| 40 | * |
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| 41 | * AF_UNIX based RPC supports 'batched calls'. |
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| 42 | * A sequence of calls may be batched-up in a send buffer. The rpc call |
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| 43 | * return immediately to the client even though the call was not necessarily |
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| 44 | * sent. The batching occurs if the results' xdr routine is NULL (0) AND |
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| 45 | * the rpc timeout value is zero (see clnt.h, rpc). |
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| 46 | * |
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| 47 | * Clients should NOT casually batch calls that in fact return results; that is, |
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| 48 | * the server side should be aware that a call is batched and not produce any |
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| 49 | * return message. Batched calls that produce many result messages can |
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| 50 | * deadlock (netlock) the client and the server.... |
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| 51 | * |
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| 52 | * Now go hang yourself. |
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| 53 | */ |
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| 54 | |
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| 55 | #include <stdio.h> |
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| 56 | #include <stdlib.h> |
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| 57 | #include <unistd.h> |
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| 58 | #include <string.h> |
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| 59 | #include <rpc/rpc.h> |
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| 60 | #include <sys/uio.h> |
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| 61 | #include <sys/socket.h> |
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| 62 | #include <sys/un.h> |
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| 63 | #include <netdb.h> |
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| 64 | #include <errno.h> |
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| 65 | #include <rpc/pmap_clnt.h> |
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| 66 | |
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| 67 | #define MCALL_MSG_SIZE 24 |
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| 68 | |
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| 69 | static int readunix(); |
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| 70 | static int writeunix(); |
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| 71 | |
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| 72 | static enum clnt_stat clntunix_call(); |
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| 73 | static void clntunix_abort(); |
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| 74 | static void clntunix_geterr(); |
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| 75 | static bool_t clntunix_freeres(); |
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| 76 | static bool_t clntunix_control(); |
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| 77 | static void clntunix_destroy(); |
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| 78 | |
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| 79 | static struct clnt_ops unix_ops = { |
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| 80 | clntunix_call, |
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| 81 | clntunix_abort, |
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| 82 | clntunix_geterr, |
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| 83 | clntunix_freeres, |
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| 84 | clntunix_destroy, |
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| 85 | clntunix_control |
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| 86 | }; |
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| 87 | |
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| 88 | struct ct_data { |
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| 89 | int ct_sock; |
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| 90 | bool_t ct_closeit; |
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| 91 | struct timeval ct_wait; |
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| 92 | bool_t ct_waitset; /* wait set by clnt_control? */ |
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| 93 | struct sockaddr_un ct_addr; |
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| 94 | struct rpc_err ct_error; |
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| 95 | char ct_mcall[MCALL_MSG_SIZE]; /* marshalled callmsg */ |
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| 96 | u_int ct_mpos; /* pos after marshal */ |
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| 97 | XDR ct_xdrs; |
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| 98 | }; |
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| 99 | |
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| 100 | /* |
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| 101 | * Create a client handle for a unix/ip connection. |
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| 102 | * If *sockp<0, *sockp is set to a newly created TCP socket and it is |
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| 103 | * connected to raddr. If *sockp non-negative then |
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| 104 | * raddr is ignored. The rpc/unix package does buffering |
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| 105 | * similar to stdio, so the client must pick send and receive buffer sizes,]; |
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| 106 | * 0 => use the default. |
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| 107 | * If raddr->sin_port is 0, then a binder on the remote machine is |
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| 108 | * consulted for the right port number. |
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| 109 | * NB: *sockp is copied into a private area. |
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| 110 | * NB: It is the clients responsibility to close *sockp. |
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| 111 | * NB: The rpch->cl_auth is set null authentication. Caller may wish to set this |
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| 112 | * something more useful. |
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| 113 | */ |
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| 114 | CLIENT * |
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| 115 | clntunix_create(raddr, prog, vers, sockp, sendsz, recvsz) |
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| 116 | struct sockaddr_un *raddr; |
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| 117 | u_long prog; |
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| 118 | u_long vers; |
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| 119 | register int *sockp; |
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| 120 | u_int sendsz; |
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| 121 | u_int recvsz; |
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| 122 | { |
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| 123 | CLIENT *h; |
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| 124 | register struct ct_data *ct = NULL; |
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| 125 | struct timeval now; |
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| 126 | struct rpc_msg call_msg; |
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| 127 | static u_int32_t disrupt; |
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| 128 | int len; |
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| 129 | |
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| 130 | if (disrupt == 0) |
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| 131 | disrupt = (u_int32_t)(long)raddr; |
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| 132 | |
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| 133 | h = (CLIENT *)mem_alloc(sizeof(*h)); |
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| 134 | if (h == NULL) { |
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| 135 | (void)fprintf(stderr, "clntunix_create: out of memory\n"); |
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| 136 | rpc_createerr.cf_stat = RPC_SYSTEMERROR; |
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| 137 | rpc_createerr.cf_error.re_errno = errno; |
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| 138 | goto fooy; |
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| 139 | } |
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| 140 | ct = (struct ct_data *)mem_alloc(sizeof(*ct)); |
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| 141 | if (ct == NULL) { |
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| 142 | (void)fprintf(stderr, "clntunix_create: out of memory\n"); |
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| 143 | rpc_createerr.cf_stat = RPC_SYSTEMERROR; |
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| 144 | rpc_createerr.cf_error.re_errno = errno; |
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| 145 | goto fooy; |
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| 146 | } |
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| 147 | |
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| 148 | /* |
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| 149 | * If no socket given, open one |
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| 150 | */ |
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| 151 | if (*sockp < 0) { |
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| 152 | *sockp = socket(AF_UNIX, SOCK_STREAM, 0); |
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| 153 | len = strlen(raddr->sun_path) + sizeof(raddr->sun_family) + |
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| 154 | sizeof(raddr->sun_len) + 1; |
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| 155 | raddr->sun_len = len; |
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| 156 | if ((*sockp < 0) |
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| 157 | || (connect(*sockp, (struct sockaddr *)raddr, len) < 0)) { |
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| 158 | rpc_createerr.cf_stat = RPC_SYSTEMERROR; |
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| 159 | rpc_createerr.cf_error.re_errno = errno; |
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| 160 | if (*sockp != -1) |
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[57cfaad] | 161 | (void)_RPC_close(*sockp); |
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[df49c60] | 162 | goto fooy; |
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| 163 | } |
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| 164 | ct->ct_closeit = TRUE; |
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| 165 | } else { |
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| 166 | ct->ct_closeit = FALSE; |
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| 167 | } |
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| 168 | |
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| 169 | /* |
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| 170 | * Set up private data struct |
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| 171 | */ |
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| 172 | ct->ct_sock = *sockp; |
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| 173 | ct->ct_wait.tv_usec = 0; |
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| 174 | ct->ct_waitset = FALSE; |
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| 175 | ct->ct_addr = *raddr; |
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| 176 | |
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| 177 | /* |
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| 178 | * Initialize call message |
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| 179 | */ |
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| 180 | (void)gettimeofday(&now, (struct timezone *)0); |
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| 181 | call_msg.rm_xid = (++disrupt) ^ getpid() ^ now.tv_sec ^ now.tv_usec; |
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| 182 | call_msg.rm_direction = CALL; |
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| 183 | call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; |
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| 184 | call_msg.rm_call.cb_prog = prog; |
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| 185 | call_msg.rm_call.cb_vers = vers; |
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| 186 | |
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| 187 | /* |
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| 188 | * pre-serialize the static part of the call msg and stash it away |
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| 189 | */ |
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| 190 | xdrmem_create(&(ct->ct_xdrs), ct->ct_mcall, MCALL_MSG_SIZE, |
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| 191 | XDR_ENCODE); |
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| 192 | if (! xdr_callhdr(&(ct->ct_xdrs), &call_msg)) { |
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| 193 | if (ct->ct_closeit) { |
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[57cfaad] | 194 | (void)_RPC_close(*sockp); |
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[df49c60] | 195 | } |
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| 196 | goto fooy; |
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| 197 | } |
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| 198 | ct->ct_mpos = XDR_GETPOS(&(ct->ct_xdrs)); |
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| 199 | XDR_DESTROY(&(ct->ct_xdrs)); |
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| 200 | |
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| 201 | /* |
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| 202 | * Create a client handle which uses xdrrec for serialization |
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| 203 | * and authnone for authentication. |
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| 204 | */ |
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| 205 | xdrrec_create(&(ct->ct_xdrs), sendsz, recvsz, |
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| 206 | (caddr_t)ct, readunix, writeunix); |
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| 207 | h->cl_ops = &unix_ops; |
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| 208 | h->cl_private = (caddr_t) ct; |
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| 209 | h->cl_auth = authnone_create(); |
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| 210 | return (h); |
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| 211 | |
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| 212 | fooy: |
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| 213 | /* |
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| 214 | * Something goofed, free stuff and barf |
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| 215 | */ |
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| 216 | if (ct) |
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| 217 | mem_free((caddr_t)ct, sizeof(struct ct_data)); |
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| 218 | if (h) |
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| 219 | mem_free((caddr_t)h, sizeof(CLIENT)); |
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| 220 | return ((CLIENT *)NULL); |
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| 221 | } |
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| 222 | |
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| 223 | static enum clnt_stat |
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| 224 | clntunix_call(h, proc, xdr_args, args_ptr, xdr_results, results_ptr, timeout) |
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| 225 | register CLIENT *h; |
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| 226 | u_long proc; |
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| 227 | xdrproc_t xdr_args; |
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| 228 | caddr_t args_ptr; |
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| 229 | xdrproc_t xdr_results; |
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| 230 | caddr_t results_ptr; |
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| 231 | struct timeval timeout; |
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| 232 | { |
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| 233 | register struct ct_data *ct = (struct ct_data *) h->cl_private; |
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| 234 | register XDR *xdrs = &(ct->ct_xdrs); |
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| 235 | struct rpc_msg reply_msg; |
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| 236 | u_long x_id; |
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| 237 | u_int32_t *msg_x_id = (u_int32_t *)(ct->ct_mcall); /* yuk */ |
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| 238 | register bool_t shipnow; |
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| 239 | int refreshes = 2; |
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| 240 | |
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| 241 | if (!ct->ct_waitset) { |
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| 242 | ct->ct_wait = timeout; |
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| 243 | } |
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| 244 | |
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| 245 | shipnow = |
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| 246 | (xdr_results == (xdrproc_t)0 && timeout.tv_sec == 0 |
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| 247 | && timeout.tv_usec == 0) ? FALSE : TRUE; |
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| 248 | |
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| 249 | call_again: |
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| 250 | xdrs->x_op = XDR_ENCODE; |
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| 251 | ct->ct_error.re_status = RPC_SUCCESS; |
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| 252 | x_id = ntohl(--(*msg_x_id)); |
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| 253 | if ((! XDR_PUTBYTES(xdrs, ct->ct_mcall, ct->ct_mpos)) || |
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| 254 | (! XDR_PUTLONG(xdrs, (long *)&proc)) || |
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| 255 | (! AUTH_MARSHALL(h->cl_auth, xdrs)) || |
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| 256 | (! (*xdr_args)(xdrs, args_ptr))) { |
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| 257 | if (ct->ct_error.re_status == RPC_SUCCESS) |
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| 258 | ct->ct_error.re_status = RPC_CANTENCODEARGS; |
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| 259 | (void)xdrrec_endofrecord(xdrs, TRUE); |
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| 260 | return (ct->ct_error.re_status); |
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| 261 | } |
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| 262 | if (! xdrrec_endofrecord(xdrs, shipnow)) |
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| 263 | return (ct->ct_error.re_status = RPC_CANTSEND); |
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| 264 | if (! shipnow) |
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| 265 | return (RPC_SUCCESS); |
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| 266 | /* |
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| 267 | * Hack to provide rpc-based message passing |
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| 268 | */ |
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| 269 | if (timeout.tv_sec == 0 && timeout.tv_usec == 0) { |
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| 270 | return(ct->ct_error.re_status = RPC_TIMEDOUT); |
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| 271 | } |
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| 272 | |
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| 273 | |
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| 274 | /* |
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| 275 | * Keep receiving until we get a valid transaction id |
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| 276 | */ |
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| 277 | xdrs->x_op = XDR_DECODE; |
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| 278 | while (TRUE) { |
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| 279 | reply_msg.acpted_rply.ar_verf = _null_auth; |
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| 280 | reply_msg.acpted_rply.ar_results.where = NULL; |
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| 281 | reply_msg.acpted_rply.ar_results.proc = xdr_void; |
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| 282 | if (! xdrrec_skiprecord(xdrs)) |
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| 283 | return (ct->ct_error.re_status); |
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| 284 | /* now decode and validate the response header */ |
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| 285 | if (! xdr_replymsg(xdrs, &reply_msg)) { |
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| 286 | if (ct->ct_error.re_status == RPC_SUCCESS) |
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| 287 | continue; |
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| 288 | return (ct->ct_error.re_status); |
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| 289 | } |
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| 290 | if (reply_msg.rm_xid == x_id) |
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| 291 | break; |
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| 292 | } |
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| 293 | |
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| 294 | /* |
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| 295 | * process header |
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| 296 | */ |
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| 297 | _seterr_reply(&reply_msg, &(ct->ct_error)); |
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| 298 | if (ct->ct_error.re_status == RPC_SUCCESS) { |
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| 299 | if (! AUTH_VALIDATE(h->cl_auth, &reply_msg.acpted_rply.ar_verf)) { |
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| 300 | ct->ct_error.re_status = RPC_AUTHERROR; |
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| 301 | ct->ct_error.re_why = AUTH_INVALIDRESP; |
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| 302 | } else if (! (*xdr_results)(xdrs, results_ptr)) { |
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| 303 | if (ct->ct_error.re_status == RPC_SUCCESS) |
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| 304 | ct->ct_error.re_status = RPC_CANTDECODERES; |
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| 305 | } |
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| 306 | /* free verifier ... */ |
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| 307 | if (reply_msg.acpted_rply.ar_verf.oa_base != NULL) { |
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| 308 | xdrs->x_op = XDR_FREE; |
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| 309 | (void)xdr_opaque_auth(xdrs, &(reply_msg.acpted_rply.ar_verf)); |
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| 310 | } |
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| 311 | } /* end successful completion */ |
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| 312 | else { |
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| 313 | /* maybe our credentials need to be refreshed ... */ |
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| 314 | if (refreshes-- && AUTH_REFRESH(h->cl_auth)) |
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| 315 | goto call_again; |
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| 316 | } /* end of unsuccessful completion */ |
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| 317 | return (ct->ct_error.re_status); |
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| 318 | } |
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| 319 | |
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| 320 | static void |
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| 321 | clntunix_geterr(h, errp) |
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| 322 | CLIENT *h; |
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| 323 | struct rpc_err *errp; |
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| 324 | { |
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| 325 | register struct ct_data *ct = |
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| 326 | (struct ct_data *) h->cl_private; |
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| 327 | |
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| 328 | *errp = ct->ct_error; |
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| 329 | } |
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| 330 | |
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| 331 | static bool_t |
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| 332 | clntunix_freeres(cl, xdr_res, res_ptr) |
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| 333 | CLIENT *cl; |
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| 334 | xdrproc_t xdr_res; |
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| 335 | caddr_t res_ptr; |
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| 336 | { |
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| 337 | register struct ct_data *ct = (struct ct_data *)cl->cl_private; |
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| 338 | register XDR *xdrs = &(ct->ct_xdrs); |
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| 339 | |
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| 340 | xdrs->x_op = XDR_FREE; |
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| 341 | return ((*xdr_res)(xdrs, res_ptr)); |
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| 342 | } |
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| 343 | |
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| 344 | static void |
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| 345 | clntunix_abort() |
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| 346 | { |
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| 347 | } |
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| 348 | |
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| 349 | |
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| 350 | static bool_t |
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| 351 | clntunix_control(cl, request, info) |
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| 352 | CLIENT *cl; |
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| 353 | int request; |
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| 354 | char *info; |
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| 355 | { |
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| 356 | register struct ct_data *ct = (struct ct_data *)cl->cl_private; |
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| 357 | register struct timeval *tv; |
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| 358 | int len; |
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| 359 | |
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| 360 | switch (request) { |
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| 361 | case CLSET_FD_CLOSE: |
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| 362 | ct->ct_closeit = TRUE; |
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| 363 | break; |
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| 364 | case CLSET_FD_NCLOSE: |
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| 365 | ct->ct_closeit = FALSE; |
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| 366 | break; |
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| 367 | case CLSET_TIMEOUT: |
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| 368 | if (info == NULL) |
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| 369 | return(FALSE); |
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| 370 | tv = (struct timeval *)info; |
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| 371 | ct->ct_wait.tv_sec = tv->tv_sec; |
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| 372 | ct->ct_wait.tv_usec = tv->tv_usec; |
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| 373 | ct->ct_waitset = TRUE; |
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| 374 | break; |
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| 375 | case CLGET_TIMEOUT: |
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| 376 | if (info == NULL) |
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| 377 | return(FALSE); |
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| 378 | *(struct timeval *)info = ct->ct_wait; |
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| 379 | break; |
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| 380 | case CLGET_SERVER_ADDR: |
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| 381 | if (info == NULL) |
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| 382 | return(FALSE); |
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| 383 | *(struct sockaddr_un *)info = ct->ct_addr; |
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| 384 | break; |
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| 385 | case CLGET_FD: |
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| 386 | if (info == NULL) |
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| 387 | return(FALSE); |
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| 388 | *(int *)info = ct->ct_sock; |
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| 389 | break; |
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| 390 | case CLGET_XID: |
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| 391 | /* |
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| 392 | * use the knowledge that xid is the |
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| 393 | * first element in the call structure *. |
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| 394 | * This will get the xid of the PREVIOUS call |
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| 395 | */ |
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| 396 | if (info == NULL) |
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| 397 | return(FALSE); |
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| 398 | *(u_long *)info = ntohl(*(u_long *)ct->ct_mcall); |
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| 399 | break; |
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| 400 | case CLSET_XID: |
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| 401 | /* This will set the xid of the NEXT call */ |
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| 402 | if (info == NULL) |
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| 403 | return(FALSE); |
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| 404 | *(u_long *)ct->ct_mcall = htonl(*(u_long *)info - 1); |
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| 405 | /* decrement by 1 as clntunix_call() increments once */ |
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| 406 | case CLGET_VERS: |
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| 407 | /* |
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| 408 | * This RELIES on the information that, in the call body, |
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| 409 | * the version number field is the fifth field from the |
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| 410 | * begining of the RPC header. MUST be changed if the |
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| 411 | * call_struct is changed |
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| 412 | */ |
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| 413 | if (info == NULL) |
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| 414 | return(FALSE); |
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| 415 | *(u_long *)info = ntohl(*(u_long *)(ct->ct_mcall + |
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| 416 | 4 * BYTES_PER_XDR_UNIT)); |
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| 417 | break; |
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| 418 | case CLSET_VERS: |
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| 419 | if (info == NULL) |
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| 420 | return(FALSE); |
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| 421 | *(u_long *)(ct->ct_mcall + 4 * BYTES_PER_XDR_UNIT) |
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| 422 | = htonl(*(u_long *)info); |
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| 423 | break; |
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| 424 | case CLGET_PROG: |
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| 425 | /* |
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| 426 | * This RELIES on the information that, in the call body, |
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| 427 | * the program number field is the field from the |
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| 428 | * begining of the RPC header. MUST be changed if the |
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| 429 | * call_struct is changed |
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| 430 | */ |
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| 431 | if (info == NULL) |
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| 432 | return(FALSE); |
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| 433 | *(u_long *)info = ntohl(*(u_long *)(ct->ct_mcall + |
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| 434 | 3 * BYTES_PER_XDR_UNIT)); |
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| 435 | break; |
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| 436 | case CLSET_PROG: |
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| 437 | if (info == NULL) |
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| 438 | return(FALSE); |
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| 439 | *(u_long *)(ct->ct_mcall + 3 * BYTES_PER_XDR_UNIT) |
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| 440 | = htonl(*(u_long *)info); |
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| 441 | break; |
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| 442 | case CLGET_LOCAL_ADDR: |
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| 443 | len = sizeof(struct sockaddr); |
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| 444 | if (getsockname(ct->ct_sock, (struct sockaddr *)info, &len) <0) |
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| 445 | return(FALSE); |
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| 446 | break; |
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| 447 | case CLGET_RETRY_TIMEOUT: |
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| 448 | case CLSET_RETRY_TIMEOUT: |
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| 449 | case CLGET_SVC_ADDR: |
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| 450 | case CLSET_SVC_ADDR: |
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| 451 | case CLSET_PUSH_TIMOD: |
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| 452 | case CLSET_POP_TIMOD: |
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| 453 | default: |
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| 454 | return (FALSE); |
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| 455 | } |
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| 456 | return (TRUE); |
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| 457 | } |
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| 458 | |
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| 459 | |
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| 460 | static void |
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| 461 | clntunix_destroy(h) |
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| 462 | CLIENT *h; |
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| 463 | { |
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| 464 | register struct ct_data *ct = |
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| 465 | (struct ct_data *) h->cl_private; |
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| 466 | |
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| 467 | if (ct->ct_closeit) { |
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[57cfaad] | 468 | (void)_RPC_close(ct->ct_sock); |
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[df49c60] | 469 | } |
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| 470 | XDR_DESTROY(&(ct->ct_xdrs)); |
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| 471 | mem_free((caddr_t)ct, sizeof(struct ct_data)); |
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| 472 | mem_free((caddr_t)h, sizeof(CLIENT)); |
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| 473 | } |
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| 474 | |
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| 475 | /* |
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| 476 | * read() and write() are replaced with recvmsg()/sendmsg() so that |
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| 477 | * we can pass ancillary control data. In this case, the data constists |
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| 478 | * of credential information which the kernel will fill in for us. |
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| 479 | * XXX: This code is specific to FreeBSD and will not work on other |
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| 480 | * platforms without the requisite kernel modifications. |
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| 481 | */ |
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| 482 | struct cmessage { |
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| 483 | struct cmsghdr cmsg; |
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| 484 | struct cmsgcred cmcred; |
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| 485 | }; |
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| 486 | |
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| 487 | static int __msgread(sock, buf, cnt) |
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| 488 | int sock; |
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| 489 | void *buf; |
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| 490 | size_t cnt; |
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| 491 | { |
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| 492 | struct iovec iov[1]; |
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| 493 | struct msghdr msg; |
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| 494 | struct cmessage cm; |
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| 495 | |
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| 496 | bzero((char *)&cm, sizeof(cm)); |
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| 497 | iov[0].iov_base = buf; |
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| 498 | iov[0].iov_len = cnt; |
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| 499 | |
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| 500 | msg.msg_iov = iov; |
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| 501 | msg.msg_iovlen = 1; |
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| 502 | msg.msg_name = NULL; |
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| 503 | msg.msg_namelen = 0; |
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| 504 | msg.msg_control = (caddr_t)&cm; |
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| 505 | msg.msg_controllen = sizeof(struct cmessage); |
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| 506 | msg.msg_flags = 0; |
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| 507 | |
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| 508 | return(recvmsg(sock, &msg, 0)); |
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| 509 | } |
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| 510 | |
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| 511 | static int __msgwrite(sock, buf, cnt) |
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| 512 | int sock; |
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| 513 | void *buf; |
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| 514 | size_t cnt; |
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| 515 | { |
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| 516 | struct iovec iov[1]; |
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| 517 | struct msghdr msg; |
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| 518 | struct cmessage cm; |
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| 519 | |
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| 520 | bzero((char *)&cm, sizeof(cm)); |
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| 521 | iov[0].iov_base = buf; |
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| 522 | iov[0].iov_len = cnt; |
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| 523 | |
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| 524 | cm.cmsg.cmsg_type = SCM_CREDS; |
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| 525 | cm.cmsg.cmsg_level = SOL_SOCKET; |
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| 526 | cm.cmsg.cmsg_len = sizeof(struct cmessage); |
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| 527 | |
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| 528 | msg.msg_iov = iov; |
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| 529 | msg.msg_iovlen = 1; |
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| 530 | msg.msg_name = NULL; |
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| 531 | msg.msg_namelen = 0; |
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| 532 | msg.msg_control = (caddr_t)&cm; |
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| 533 | msg.msg_controllen = sizeof(struct cmessage); |
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| 534 | msg.msg_flags = 0; |
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| 535 | |
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| 536 | return(sendmsg(sock, &msg, 0)); |
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| 537 | } |
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| 538 | |
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| 539 | /* |
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| 540 | * Interface between xdr serializer and unix connection. |
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| 541 | * Behaves like the system calls, read & write, but keeps some error state |
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| 542 | * around for the rpc level. |
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| 543 | */ |
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| 544 | static int |
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| 545 | readunix(ct, buf, len) |
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| 546 | register struct ct_data *ct; |
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| 547 | caddr_t buf; |
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| 548 | register int len; |
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| 549 | { |
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| 550 | fd_set *fds, readfds; |
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| 551 | struct timeval start, after, duration, delta, tmp, tv; |
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| 552 | int r, save_errno; |
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| 553 | |
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| 554 | if (len == 0) |
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| 555 | return (0); |
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| 556 | |
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| 557 | if (ct->ct_sock + 1 > FD_SETSIZE) { |
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| 558 | int bytes = howmany(ct->ct_sock + 1, NFDBITS) * sizeof(fd_mask); |
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| 559 | fds = (fd_set *)malloc(bytes); |
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| 560 | if (fds == NULL) |
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| 561 | return (-1); |
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| 562 | memset(fds, 0, bytes); |
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| 563 | } else { |
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| 564 | fds = &readfds; |
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| 565 | FD_ZERO(fds); |
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| 566 | } |
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| 567 | |
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| 568 | gettimeofday(&start, NULL); |
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| 569 | delta = ct->ct_wait; |
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| 570 | while (TRUE) { |
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| 571 | /* XXX we know the other bits are still clear */ |
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| 572 | FD_SET(ct->ct_sock, fds); |
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| 573 | tv = delta; /* in case select writes back */ |
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| 574 | r = select(ct->ct_sock+1, fds, NULL, NULL, &tv); |
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| 575 | save_errno = errno; |
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| 576 | |
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| 577 | gettimeofday(&after, NULL); |
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| 578 | timersub(&start, &after, &duration); |
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| 579 | timersub(&delta, &duration, &tmp); |
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| 580 | delta = tmp; |
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| 581 | if (delta.tv_sec < 0 || !timerisset(&delta)) |
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| 582 | r = 0; |
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| 583 | |
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| 584 | switch (r) { |
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| 585 | case 0: |
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| 586 | if (fds != &readfds) |
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| 587 | free(fds); |
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| 588 | ct->ct_error.re_status = RPC_TIMEDOUT; |
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| 589 | return (-1); |
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| 590 | |
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| 591 | case -1: |
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| 592 | if (errno == EINTR) |
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| 593 | continue; |
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| 594 | if (fds != &readfds) |
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| 595 | free(fds); |
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| 596 | ct->ct_error.re_status = RPC_CANTRECV; |
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| 597 | ct->ct_error.re_errno = save_errno; |
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| 598 | return (-1); |
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| 599 | } |
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| 600 | break; |
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| 601 | } |
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| 602 | switch (len = __msgread(ct->ct_sock, buf, len)) { |
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| 603 | |
---|
| 604 | case 0: |
---|
| 605 | /* premature eof */ |
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| 606 | ct->ct_error.re_errno = ECONNRESET; |
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| 607 | ct->ct_error.re_status = RPC_CANTRECV; |
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| 608 | len = -1; /* it's really an error */ |
---|
| 609 | break; |
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| 610 | |
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| 611 | case -1: |
---|
| 612 | ct->ct_error.re_errno = errno; |
---|
| 613 | ct->ct_error.re_status = RPC_CANTRECV; |
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| 614 | break; |
---|
| 615 | } |
---|
| 616 | return (len); |
---|
| 617 | } |
---|
| 618 | |
---|
| 619 | static int |
---|
| 620 | writeunix(ct, buf, len) |
---|
| 621 | struct ct_data *ct; |
---|
| 622 | caddr_t buf; |
---|
| 623 | int len; |
---|
| 624 | { |
---|
| 625 | register int i, cnt; |
---|
| 626 | |
---|
| 627 | for (cnt = len; cnt > 0; cnt -= i, buf += i) { |
---|
| 628 | if ((i = __msgwrite(ct->ct_sock, buf, cnt)) == -1) { |
---|
| 629 | ct->ct_error.re_errno = errno; |
---|
| 630 | ct->ct_error.re_status = RPC_CANTSEND; |
---|
| 631 | return (-1); |
---|
| 632 | } |
---|
| 633 | } |
---|
| 634 | return (len); |
---|
| 635 | } |
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