1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 23 /* 24 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 25 * Use is subject to license terms. 26 */ 27 28 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ 29 /* All Rights Reserved */ 30 /* 31 * Portions of this source code were derived from Berkeley 32 * 4.3 BSD under license from the Regents of the University of 33 * California. 34 */ 35 36 /* 37 * XDR routines for the rpcbinder version 3. 38 */ 39 40 #include "mt.h" 41 #include <rpc/rpc.h> 42 #include <rpc/types.h> 43 #include <rpc/xdr.h> 44 #include <rpc/rpcb_prot.h> 45 46 47 bool_t 48 xdr_rpcb(XDR *xdrs, RPCB *objp) 49 { 50 if (!xdr_u_int(xdrs, (uint_t *)&objp->r_prog)) 51 return (FALSE); 52 if (!xdr_u_int(xdrs, (uint_t *)&objp->r_vers)) 53 return (FALSE); 54 if (!xdr_string(xdrs, &objp->r_netid, ~0)) 55 return (FALSE); 56 if (!xdr_string(xdrs, &objp->r_addr, ~0)) 57 return (FALSE); 58 return (xdr_string(xdrs, &objp->r_owner, ~0)); 59 } 60 61 /* 62 * rpcblist_ptr implements a linked list. The RPCL definition from 63 * rpcb_prot.x is: 64 * 65 * struct rpcblist { 66 * rpcb rpcb_map; 67 * struct rpcblist *rpcb_next; 68 * }; 69 * typedef rpcblist *rpcblist_ptr; 70 * 71 * Recall that "pointers" in XDR are encoded as a boolean, indicating whether 72 * there's any data behind the pointer, followed by the data (if any exists). 73 * The boolean can be interpreted as ``more data follows me''; if FALSE then 74 * nothing follows the boolean; if TRUE then the boolean is followed by an 75 * actual struct rpcb, and another rpcblist_ptr (declared in RPCL as "struct 76 * rpcblist *"). 77 * 78 * This could be implemented via the xdr_pointer type, though this would 79 * result in one recursive call per element in the list. Rather than do that 80 * we can ``unwind'' the recursion into a while loop and use xdr_reference to 81 * serialize the rpcb elements. 82 */ 83 84 bool_t 85 xdr_rpcblist_ptr(XDR *xdrs, rpcblist_ptr *rp) 86 { 87 /* 88 * more_elements is pre-computed in case the direction is 89 * XDR_ENCODE or XDR_FREE. more_elements is overwritten by 90 * xdr_bool when the direction is XDR_DECODE. 91 */ 92 bool_t more_elements; 93 int freeing = (xdrs->x_op == XDR_FREE); 94 rpcblist_ptr next; 95 rpcblist_ptr next_copy; 96 97 for (;;) { 98 more_elements = (bool_t)(*rp != NULL); 99 if (!xdr_bool(xdrs, &more_elements)) 100 return (FALSE); 101 if (!more_elements) 102 return (TRUE); /* we are done */ 103 /* 104 * the unfortunate side effect of non-recursion is that in 105 * the case of freeing we must remember the next object 106 * before we free the current object ... 107 */ 108 if (freeing) 109 next = (*rp)->rpcb_next; 110 if (!xdr_reference(xdrs, (caddr_t *)rp, 111 (uint_t)sizeof (rpcblist), (xdrproc_t)xdr_rpcb)) 112 return (FALSE); 113 if (freeing) { 114 next_copy = next; 115 rp = &next_copy; 116 /* 117 * Note that in the subsequent iteration, next_copy 118 * gets nulled out by the xdr_reference 119 * but next itself survives. 120 */ 121 } else { 122 rp = &((*rp)->rpcb_next); 123 } 124 } 125 /*NOTREACHED*/ 126 } 127 128 /* 129 * xdr_rpcblist() is specified to take a RPCBLIST **, but is identical in 130 * functionality to xdr_rpcblist_ptr(). 131 */ 132 bool_t 133 xdr_rpcblist(XDR *xdrs, RPCBLIST **rp) 134 { 135 return (xdr_rpcblist_ptr(xdrs, (rpcblist_ptr *)rp)); 136 } 137 138 139 bool_t 140 xdr_rpcb_entry(XDR *xdrs, rpcb_entry *objp) 141 { 142 if (!xdr_string(xdrs, &objp->r_maddr, ~0)) 143 return (FALSE); 144 if (!xdr_string(xdrs, &objp->r_nc_netid, ~0)) 145 return (FALSE); 146 if (!xdr_u_int(xdrs, &objp->r_nc_semantics)) 147 return (FALSE); 148 if (!xdr_string(xdrs, &objp->r_nc_protofmly, ~0)) 149 return (FALSE); 150 return (xdr_string(xdrs, &objp->r_nc_proto, ~0)); 151 } 152 153 bool_t 154 xdr_rpcb_entry_list_ptr(XDR *xdrs, rpcb_entry_list_ptr *rp) 155 { 156 /* 157 * more_elements is pre-computed in case the direction is 158 * XDR_ENCODE or XDR_FREE. more_elements is overwritten by 159 * xdr_bool when the direction is XDR_DECODE. 160 */ 161 bool_t more_elements; 162 int freeing = (xdrs->x_op == XDR_FREE); 163 rpcb_entry_list_ptr next; 164 rpcb_entry_list_ptr next_copy; 165 166 for (;;) { 167 more_elements = (bool_t)(*rp != NULL); 168 if (!xdr_bool(xdrs, &more_elements)) 169 return (FALSE); 170 if (!more_elements) 171 return (TRUE); /* we are done */ 172 /* 173 * the unfortunate side effect of non-recursion is that in 174 * the case of freeing we must remember the next object 175 * before we free the current object ... 176 */ 177 if (freeing) 178 next = (*rp)->rpcb_entry_next; 179 if (!xdr_reference(xdrs, (caddr_t *)rp, 180 (uint_t)sizeof (rpcb_entry_list), 181 (xdrproc_t)xdr_rpcb_entry)) 182 return (FALSE); 183 if (freeing) { 184 next_copy = next; 185 rp = &next_copy; 186 /* 187 * Note that in the subsequent iteration, next_copy 188 * gets nulled out by the xdr_reference 189 * but next itself survives. 190 */ 191 } else { 192 rp = &((*rp)->rpcb_entry_next); 193 } 194 } 195 /*NOTREACHED*/ 196 } 197 198 /* 199 * XDR remote call arguments 200 * written for XDR_ENCODE direction only 201 */ 202 bool_t 203 xdr_rpcb_rmtcallargs(XDR *xdrs, struct r_rpcb_rmtcallargs *objp) 204 { 205 uint_t lenposition, argposition, position; 206 rpc_inline_t *buf; 207 208 buf = XDR_INLINE(xdrs, 3 * BYTES_PER_XDR_UNIT); 209 if (buf == NULL) { 210 if (!xdr_u_int(xdrs, (uint_t *)&objp->prog)) 211 return (FALSE); 212 if (!xdr_u_int(xdrs, (uint_t *)&objp->vers)) 213 return (FALSE); 214 if (!xdr_u_int(xdrs, (uint_t *)&objp->proc)) 215 return (FALSE); 216 } else { 217 IXDR_PUT_U_INT32(buf, objp->prog); 218 IXDR_PUT_U_INT32(buf, objp->vers); 219 IXDR_PUT_U_INT32(buf, objp->proc); 220 } 221 222 /* 223 * All the jugglery for just getting the size of the arguments 224 */ 225 lenposition = XDR_GETPOS(xdrs); 226 if (!xdr_u_int(xdrs, &(objp->args.args_len))) 227 return (FALSE); 228 argposition = XDR_GETPOS(xdrs); 229 if (!(*objp->xdr_args)(xdrs, objp->args.args_val)) 230 return (FALSE); 231 position = XDR_GETPOS(xdrs); 232 objp->args.args_len = (uint_t)position - (uint_t)argposition; 233 XDR_SETPOS(xdrs, lenposition); 234 if (!xdr_u_int(xdrs, &(objp->args.args_len))) 235 return (FALSE); 236 XDR_SETPOS(xdrs, position); 237 return (TRUE); 238 } 239 240 /* 241 * XDR remote call results 242 * written for XDR_DECODE direction only 243 */ 244 bool_t 245 xdr_rpcb_rmtcallres(XDR *xdrs, struct r_rpcb_rmtcallres *objp) 246 { 247 if (!xdr_string(xdrs, &objp->addr, ~0)) 248 return (FALSE); 249 if (!xdr_u_int(xdrs, &objp->results.results_len)) 250 return (FALSE); 251 return ((*(objp->xdr_res))(xdrs, objp->results.results_val)); 252 } 253 254 bool_t 255 xdr_netbuf(XDR *xdrs, struct netbuf *objp) 256 { 257 bool_t res; 258 259 /* 260 * Save the passed in maxlen value and buf pointer. We might 261 * need them later. 262 */ 263 uint_t maxlen_save = objp->maxlen; 264 void *buf_save = objp->buf; 265 266 if (!xdr_u_int(xdrs, &objp->maxlen)) 267 return (FALSE); 268 269 /* 270 * We need to free maxlen, not len, so do it explicitly now. 271 */ 272 if (xdrs->x_op == XDR_FREE) 273 return (xdr_bytes(xdrs, &objp->buf, &objp->maxlen, 274 objp->maxlen)); 275 276 /* 277 * If we're decoding and the caller has already allocated a 278 * buffer restore the maxlen value since the decoded value 279 * doesn't apply to the caller's buffer. xdr_bytes() will 280 * return an error if the buffer isn't big enough. 281 */ 282 if (xdrs->x_op == XDR_DECODE && objp->buf != NULL) 283 objp->maxlen = maxlen_save; 284 285 res = xdr_bytes(xdrs, &objp->buf, &objp->len, objp->maxlen); 286 287 /* 288 * If we are decoding and the buffer was allocated in the 289 * xdr_bytes() function we need to set maxlen properly to 290 * follow the netbuf semantics. 291 */ 292 if (xdrs->x_op == XDR_DECODE && objp->buf != buf_save) 293 objp->maxlen = objp->len; 294 295 return (res); 296 } 297