[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: @(#)svc.c 1.44 88/02/08 Copyr 1984 Sun Micro";*/ |
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| 32 | /*static char *sccsid = "from: @(#)svc.c 2.4 88/08/11 4.0 RPCSRC";*/ |
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| 33 | static char *rcsid = "$FreeBSD: src/lib/libc/rpc/svc.c,v 1.14 1999/08/28 00:00:48 peter Exp $"; |
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| 34 | #endif |
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| 35 | |
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| 36 | /* |
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| 37 | * svc.c, Server-side remote procedure call interface. |
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| 38 | * |
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| 39 | * There are two sets of procedures here. The xprt routines are |
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| 40 | * for handling transport handles. The svc routines handle the |
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| 41 | * list of service routines. |
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| 42 | * |
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| 43 | * Copyright (C) 1984, Sun Microsystems, Inc. |
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| 44 | */ |
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| 45 | |
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| 46 | #include <string.h> |
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| 47 | #include <stdlib.h> |
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| 48 | #include <sys/errno.h> |
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| 49 | #include <rpc/rpc.h> |
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| 50 | #include <rpc/pmap_clnt.h> |
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| 51 | |
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[ddb56f4] | 52 | #define xports (rtems_rpc_task_variables->svc_xports) |
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[d16b2d3] | 53 | #define xportssize (rtems_rpc_task_variables->svc_xportssize) |
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[df49c60] | 54 | |
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| 55 | #define NULL_SVC ((struct svc_callout *)0) |
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| 56 | #define RQCRED_SIZE 400 /* this size is excessive */ |
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| 57 | |
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| 58 | #define max(a, b) (a > b ? a : b) |
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| 59 | |
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| 60 | /* |
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| 61 | * The services list |
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| 62 | * Each entry represents a set of procedures (an rpc program). |
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| 63 | * The dispatch routine takes request structs and runs the |
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| 64 | * apropriate procedure. |
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| 65 | */ |
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| 66 | struct svc_callout { |
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| 67 | struct svc_callout *sc_next; |
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| 68 | u_long sc_prog; |
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| 69 | u_long sc_vers; |
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| 70 | void (*sc_dispatch)(); |
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| 71 | }; |
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[ddb56f4] | 72 | #define svc_head (rtems_rpc_task_variables->svc_svc_head) |
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[df49c60] | 73 | |
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| 74 | static struct svc_callout *svc_find(); |
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| 75 | |
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| 76 | /* *************** SVCXPRT related stuff **************** */ |
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| 77 | |
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| 78 | /* |
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| 79 | * Activate a transport handle. |
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| 80 | */ |
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| 81 | void |
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[5220ae2] | 82 | xprt_register( |
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| 83 | SVCXPRT *xprt ) |
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[df49c60] | 84 | { |
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| 85 | register int sock = xprt->xp_sock; |
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| 86 | |
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| 87 | if (sock + 1 > __svc_fdsetsize) { |
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| 88 | int bytes = sizeof (fd_set); |
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| 89 | fd_set *fds; |
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| 90 | |
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| 91 | fds = (fd_set *)malloc(bytes); |
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| 92 | memset(fds, 0, bytes); |
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| 93 | if (__svc_fdset) { |
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| 94 | memcpy(fds, __svc_fdset, bytes); |
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| 95 | free(__svc_fdset); |
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| 96 | } |
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| 97 | __svc_fdset = fds; |
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| 98 | __svc_fdsetsize = bytes * NBBY; |
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| 99 | } |
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| 100 | |
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| 101 | if (sock < FD_SETSIZE) |
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| 102 | FD_SET(sock, &svc_fdset); |
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| 103 | FD_SET(sock, __svc_fdset); |
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| 104 | |
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| 105 | if (xports == NULL || sock + 1 > xportssize) { |
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| 106 | SVCXPRT **xp; |
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| 107 | int size = FD_SETSIZE; |
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| 108 | |
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| 109 | if (sock + 1 > size) |
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| 110 | size = sock + 1; |
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| 111 | xp = (SVCXPRT **)mem_alloc(size * sizeof(SVCXPRT *)); |
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| 112 | memset(xp, 0, size * sizeof(SVCXPRT *)); |
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| 113 | if (xports) { |
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| 114 | memcpy(xp, xports, xportssize * sizeof(SVCXPRT *)); |
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| 115 | free(xports); |
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| 116 | } |
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| 117 | xportssize = size; |
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| 118 | xports = xp; |
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| 119 | } |
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| 120 | xports[sock] = xprt; |
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| 121 | svc_maxfd = max(svc_maxfd, sock); |
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| 122 | } |
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| 123 | |
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| 124 | /* |
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| 125 | * De-activate a transport handle. |
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| 126 | */ |
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| 127 | void |
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[5220ae2] | 128 | xprt_unregister( |
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| 129 | SVCXPRT *xprt ) |
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[df49c60] | 130 | { |
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| 131 | register int sock = xprt->xp_sock; |
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| 132 | |
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| 133 | if (xports[sock] == xprt) { |
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| 134 | xports[sock] = (SVCXPRT *)0; |
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| 135 | if (sock < FD_SETSIZE) |
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| 136 | FD_CLR(sock, &svc_fdset); |
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| 137 | FD_CLR(sock, __svc_fdset); |
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| 138 | if (sock == svc_maxfd) { |
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| 139 | for (svc_maxfd--; svc_maxfd >= 0; svc_maxfd--) |
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| 140 | if (xports[svc_maxfd]) |
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| 141 | break; |
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| 142 | } |
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| 143 | /* |
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| 144 | * XXX could use svc_maxfd as a hint to |
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| 145 | * decrease the size of __svc_fdset |
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| 146 | */ |
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| 147 | } |
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| 148 | } |
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| 149 | |
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| 150 | |
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| 151 | /* ********************** CALLOUT list related stuff ************* */ |
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| 152 | |
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| 153 | /* |
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| 154 | * Add a service program to the callout list. |
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| 155 | * The dispatch routine will be called when a rpc request for this |
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| 156 | * program number comes in. |
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| 157 | */ |
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| 158 | bool_t |
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[5220ae2] | 159 | svc_register( |
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| 160 | SVCXPRT *xprt, |
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| 161 | u_long prog, |
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| 162 | u_long vers, |
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| 163 | void (*dispatch)(), |
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| 164 | int protocol ) |
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[df49c60] | 165 | { |
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| 166 | struct svc_callout *prev; |
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| 167 | register struct svc_callout *s; |
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| 168 | |
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| 169 | if ((s = svc_find(prog, vers, &prev)) != NULL_SVC) { |
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| 170 | if (s->sc_dispatch == dispatch) |
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| 171 | goto pmap_it; /* he is registering another xptr */ |
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| 172 | return (FALSE); |
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| 173 | } |
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| 174 | s = (struct svc_callout *)mem_alloc(sizeof(struct svc_callout)); |
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| 175 | if (s == (struct svc_callout *)0) { |
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| 176 | return (FALSE); |
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| 177 | } |
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| 178 | s->sc_prog = prog; |
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| 179 | s->sc_vers = vers; |
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| 180 | s->sc_dispatch = dispatch; |
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| 181 | s->sc_next = svc_head; |
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| 182 | svc_head = s; |
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| 183 | pmap_it: |
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| 184 | /* now register the information with the local binder service */ |
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| 185 | if (protocol) { |
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| 186 | return (pmap_set(prog, vers, protocol, xprt->xp_port)); |
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| 187 | } |
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| 188 | return (TRUE); |
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| 189 | } |
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| 190 | |
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| 191 | /* |
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| 192 | * Remove a service program from the callout list. |
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| 193 | */ |
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| 194 | void |
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[5220ae2] | 195 | svc_unregister( |
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| 196 | u_long prog, |
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| 197 | u_long vers ) |
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[df49c60] | 198 | { |
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| 199 | struct svc_callout *prev; |
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| 200 | register struct svc_callout *s; |
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| 201 | |
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| 202 | if ((s = svc_find(prog, vers, &prev)) == NULL_SVC) |
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| 203 | return; |
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| 204 | if (prev == NULL_SVC) { |
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| 205 | svc_head = s->sc_next; |
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| 206 | } else { |
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| 207 | prev->sc_next = s->sc_next; |
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| 208 | } |
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| 209 | s->sc_next = NULL_SVC; |
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| 210 | mem_free((char *) s, (u_int) sizeof(struct svc_callout)); |
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| 211 | /* now unregister the information with the local binder service */ |
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| 212 | (void)pmap_unset(prog, vers); |
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| 213 | } |
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| 214 | |
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| 215 | /* |
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| 216 | * Search the callout list for a program number, return the callout |
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| 217 | * struct. |
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| 218 | */ |
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| 219 | static struct svc_callout * |
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[5220ae2] | 220 | svc_find( |
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| 221 | u_long prog, |
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| 222 | u_long vers, |
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| 223 | struct svc_callout **prev ) |
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[df49c60] | 224 | { |
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| 225 | register struct svc_callout *s, *p; |
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| 226 | |
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| 227 | p = NULL_SVC; |
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| 228 | for (s = svc_head; s != NULL_SVC; s = s->sc_next) { |
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| 229 | if ((s->sc_prog == prog) && (s->sc_vers == vers)) |
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| 230 | goto done; |
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| 231 | p = s; |
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| 232 | } |
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| 233 | done: |
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| 234 | *prev = p; |
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| 235 | return (s); |
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| 236 | } |
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| 237 | |
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| 238 | /* ******************* REPLY GENERATION ROUTINES ************ */ |
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| 239 | |
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| 240 | /* |
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| 241 | * Send a reply to an rpc request |
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| 242 | */ |
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| 243 | bool_t |
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[5220ae2] | 244 | svc_sendreply( |
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| 245 | register SVCXPRT *xprt, |
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| 246 | xdrproc_t xdr_results, |
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| 247 | caddr_t xdr_location ) |
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[df49c60] | 248 | { |
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| 249 | struct rpc_msg rply; |
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| 250 | |
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| 251 | rply.rm_direction = REPLY; |
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| 252 | rply.rm_reply.rp_stat = MSG_ACCEPTED; |
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| 253 | rply.acpted_rply.ar_verf = xprt->xp_verf; |
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| 254 | rply.acpted_rply.ar_stat = SUCCESS; |
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| 255 | rply.acpted_rply.ar_results.where = xdr_location; |
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| 256 | rply.acpted_rply.ar_results.proc = xdr_results; |
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| 257 | return (SVC_REPLY(xprt, &rply)); |
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| 258 | } |
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| 259 | |
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| 260 | /* |
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| 261 | * No procedure error reply |
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| 262 | */ |
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| 263 | void |
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[5220ae2] | 264 | svcerr_noproc( |
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| 265 | register SVCXPRT *xprt ) |
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[df49c60] | 266 | { |
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| 267 | struct rpc_msg rply; |
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| 268 | |
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| 269 | rply.rm_direction = REPLY; |
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| 270 | rply.rm_reply.rp_stat = MSG_ACCEPTED; |
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| 271 | rply.acpted_rply.ar_verf = xprt->xp_verf; |
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| 272 | rply.acpted_rply.ar_stat = PROC_UNAVAIL; |
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| 273 | SVC_REPLY(xprt, &rply); |
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| 274 | } |
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| 275 | |
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| 276 | /* |
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| 277 | * Can't decode args error reply |
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| 278 | */ |
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| 279 | void |
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[5220ae2] | 280 | svcerr_decode( |
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| 281 | register SVCXPRT *xprt ) |
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[df49c60] | 282 | { |
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| 283 | struct rpc_msg rply; |
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| 284 | |
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| 285 | rply.rm_direction = REPLY; |
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| 286 | rply.rm_reply.rp_stat = MSG_ACCEPTED; |
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| 287 | rply.acpted_rply.ar_verf = xprt->xp_verf; |
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| 288 | rply.acpted_rply.ar_stat = GARBAGE_ARGS; |
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| 289 | SVC_REPLY(xprt, &rply); |
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| 290 | } |
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| 291 | |
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| 292 | /* |
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| 293 | * Some system error |
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| 294 | */ |
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| 295 | void |
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[5220ae2] | 296 | svcerr_systemerr( |
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| 297 | register SVCXPRT *xprt ) |
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[df49c60] | 298 | { |
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| 299 | struct rpc_msg rply; |
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| 300 | |
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| 301 | rply.rm_direction = REPLY; |
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| 302 | rply.rm_reply.rp_stat = MSG_ACCEPTED; |
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| 303 | rply.acpted_rply.ar_verf = xprt->xp_verf; |
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| 304 | rply.acpted_rply.ar_stat = SYSTEM_ERR; |
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| 305 | SVC_REPLY(xprt, &rply); |
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| 306 | } |
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| 307 | |
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| 308 | /* |
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| 309 | * Authentication error reply |
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| 310 | */ |
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| 311 | void |
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[5220ae2] | 312 | svcerr_auth( |
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| 313 | SVCXPRT *xprt, |
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| 314 | enum auth_stat why ) |
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[df49c60] | 315 | { |
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| 316 | struct rpc_msg rply; |
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| 317 | |
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| 318 | rply.rm_direction = REPLY; |
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| 319 | rply.rm_reply.rp_stat = MSG_DENIED; |
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| 320 | rply.rjcted_rply.rj_stat = AUTH_ERROR; |
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| 321 | rply.rjcted_rply.rj_why = why; |
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| 322 | SVC_REPLY(xprt, &rply); |
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| 323 | } |
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| 324 | |
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| 325 | /* |
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| 326 | * Auth too weak error reply |
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| 327 | */ |
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| 328 | void |
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[5220ae2] | 329 | svcerr_weakauth( |
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| 330 | SVCXPRT *xprt ) |
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[df49c60] | 331 | { |
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| 332 | |
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| 333 | svcerr_auth(xprt, AUTH_TOOWEAK); |
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| 334 | } |
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| 335 | |
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| 336 | /* |
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| 337 | * Program unavailable error reply |
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| 338 | */ |
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| 339 | void |
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[5220ae2] | 340 | svcerr_noprog( |
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| 341 | register SVCXPRT *xprt ) |
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[df49c60] | 342 | { |
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| 343 | struct rpc_msg rply; |
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| 344 | |
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| 345 | rply.rm_direction = REPLY; |
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| 346 | rply.rm_reply.rp_stat = MSG_ACCEPTED; |
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| 347 | rply.acpted_rply.ar_verf = xprt->xp_verf; |
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| 348 | rply.acpted_rply.ar_stat = PROG_UNAVAIL; |
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| 349 | SVC_REPLY(xprt, &rply); |
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| 350 | } |
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| 351 | |
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| 352 | /* |
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| 353 | * Program version mismatch error reply |
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| 354 | */ |
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| 355 | void |
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[5220ae2] | 356 | svcerr_progvers( |
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| 357 | register SVCXPRT *xprt, |
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| 358 | u_long low_vers, |
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| 359 | u_long high_vers ) |
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[df49c60] | 360 | { |
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| 361 | struct rpc_msg rply; |
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| 362 | |
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| 363 | rply.rm_direction = REPLY; |
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| 364 | rply.rm_reply.rp_stat = MSG_ACCEPTED; |
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| 365 | rply.acpted_rply.ar_verf = xprt->xp_verf; |
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| 366 | rply.acpted_rply.ar_stat = PROG_MISMATCH; |
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| 367 | rply.acpted_rply.ar_vers.low = low_vers; |
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| 368 | rply.acpted_rply.ar_vers.high = high_vers; |
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| 369 | SVC_REPLY(xprt, &rply); |
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| 370 | } |
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| 371 | |
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| 372 | /* ******************* SERVER INPUT STUFF ******************* */ |
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| 373 | |
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| 374 | /* |
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| 375 | * Get server side input from some transport. |
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| 376 | * |
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| 377 | * Statement of authentication parameters management: |
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| 378 | * This function owns and manages all authentication parameters, specifically |
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| 379 | * the "raw" parameters (msg.rm_call.cb_cred and msg.rm_call.cb_verf) and |
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| 380 | * the "cooked" credentials (rqst->rq_clntcred). |
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| 381 | * However, this function does not know the structure of the cooked |
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| 382 | * credentials, so it make the following assumptions: |
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| 383 | * a) the structure is contiguous (no pointers), and |
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| 384 | * b) the cred structure size does not exceed RQCRED_SIZE bytes. |
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| 385 | * In all events, all three parameters are freed upon exit from this routine. |
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| 386 | * The storage is trivially management on the call stack in user land, but |
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| 387 | * is mallocated in kernel land. |
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| 388 | */ |
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| 389 | |
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| 390 | void |
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[5220ae2] | 391 | svc_getreq( |
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| 392 | int rdfds ) |
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[df49c60] | 393 | { |
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| 394 | fd_set readfds; |
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| 395 | |
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| 396 | FD_ZERO(&readfds); |
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| 397 | readfds.fds_bits[0] = rdfds; |
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| 398 | svc_getreqset(&readfds); |
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| 399 | } |
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| 400 | |
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| 401 | void |
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[5220ae2] | 402 | svc_getreqset( |
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| 403 | fd_set *readfds ) |
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[df49c60] | 404 | { |
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| 405 | svc_getreqset2(readfds, FD_SETSIZE); |
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| 406 | } |
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| 407 | |
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| 408 | void |
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[5220ae2] | 409 | svc_getreqset2( |
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| 410 | fd_set *readfds, |
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| 411 | int width ) |
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[df49c60] | 412 | { |
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| 413 | enum xprt_stat stat; |
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| 414 | struct rpc_msg msg; |
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| 415 | int prog_found; |
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| 416 | u_long low_vers; |
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| 417 | u_long high_vers; |
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| 418 | struct svc_req r; |
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| 419 | register SVCXPRT *xprt; |
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| 420 | register int bit; |
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| 421 | register int sock; |
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| 422 | register fd_mask mask, *maskp; |
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| 423 | char cred_area[2*MAX_AUTH_BYTES + RQCRED_SIZE]; |
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| 424 | msg.rm_call.cb_cred.oa_base = cred_area; |
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| 425 | msg.rm_call.cb_verf.oa_base = &(cred_area[MAX_AUTH_BYTES]); |
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| 426 | r.rq_clntcred = &(cred_area[2*MAX_AUTH_BYTES]); |
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| 427 | |
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| 428 | |
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| 429 | maskp = readfds->fds_bits; |
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| 430 | for (sock = 0; sock < width; sock += NFDBITS) { |
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| 431 | for (mask = *maskp++; (bit = ffs(mask)); mask ^= (1 << (bit - 1))) { |
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| 432 | /* sock has input waiting */ |
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| 433 | xprt = xports[sock + bit - 1]; |
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| 434 | if (xprt == NULL) |
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| 435 | /* But do we control sock? */ |
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| 436 | continue; |
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| 437 | /* now receive msgs from xprtprt (support batch calls) */ |
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| 438 | do { |
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| 439 | if (SVC_RECV(xprt, &msg)) { |
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| 440 | |
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| 441 | /* now find the exported program and call it */ |
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| 442 | register struct svc_callout *s; |
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| 443 | enum auth_stat why; |
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| 444 | |
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| 445 | r.rq_xprt = xprt; |
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| 446 | r.rq_prog = msg.rm_call.cb_prog; |
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| 447 | r.rq_vers = msg.rm_call.cb_vers; |
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| 448 | r.rq_proc = msg.rm_call.cb_proc; |
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| 449 | r.rq_cred = msg.rm_call.cb_cred; |
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| 450 | /* first authenticate the message */ |
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| 451 | if ((why= _authenticate(&r, &msg)) != AUTH_OK) { |
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| 452 | svcerr_auth(xprt, why); |
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| 453 | goto call_done; |
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| 454 | } |
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| 455 | /* now match message with a registered service*/ |
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| 456 | prog_found = FALSE; |
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| 457 | low_vers = (u_long) - 1; |
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| 458 | high_vers = 0; |
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| 459 | for (s = svc_head; s != NULL_SVC; s = s->sc_next) { |
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| 460 | if (s->sc_prog == r.rq_prog) { |
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| 461 | if (s->sc_vers == r.rq_vers) { |
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| 462 | (*s->sc_dispatch)(&r, xprt); |
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| 463 | goto call_done; |
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| 464 | } /* found correct version */ |
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| 465 | prog_found = TRUE; |
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| 466 | if (s->sc_vers < low_vers) |
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| 467 | low_vers = s->sc_vers; |
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| 468 | if (s->sc_vers > high_vers) |
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| 469 | high_vers = s->sc_vers; |
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| 470 | } /* found correct program */ |
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| 471 | } |
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| 472 | /* |
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| 473 | * if we got here, the program or version |
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| 474 | * is not served ... |
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| 475 | */ |
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| 476 | if (prog_found) |
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| 477 | svcerr_progvers(xprt, |
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| 478 | low_vers, high_vers); |
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| 479 | else |
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| 480 | svcerr_noprog(xprt); |
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| 481 | /* Fall through to ... */ |
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| 482 | } |
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| 483 | call_done: |
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| 484 | if ((stat = SVC_STAT(xprt)) == XPRT_DIED){ |
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| 485 | SVC_DESTROY(xprt); |
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| 486 | break; |
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| 487 | } |
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| 488 | } while (stat == XPRT_MOREREQS); |
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| 489 | } |
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| 490 | } |
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| 491 | } |
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