lib/libnfs-zdr.c

   1 /*
   2    Copyright (C) 2012 by Ronnie Sahlberg <ronniesahlberg@gmail.com>
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU Lesser General Public License as published by
   6    the Free Software Foundation; either version 2.1 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public License
  15    along with this program; if not, see <http://www.gnu.org/licenses/>.
  16 */
  17 /*
  18  * This file contains definitions for the built in ZDR implementation.
  19  * This is a very limited ZDR subset that can only marshal to/from a momory buffer,
  20  * i.e. zdrmem_create() buffers.
  21  * It aims to be compatible with normal rpcgen generated functions.
  22  */
  23 #ifdef WIN32
  24 #include "win32_compat.h"
  25 #endif
  26
  27 #ifdef AROS
  28 #include "aros_compat.h"
  29 #endif
  30
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <time.h>
  34 #include "libnfs-zdr.h"
  35
  36 struct opaque_auth _null_auth;
  37
  38 bool_t libnfs_zdr_setpos(ZDR *zdrs, uint32_t pos)
  39 {
  40         zdrs->pos = pos;
  41
  42         return TRUE;
  43 }
  44
  45 uint32_t libnfs_zdr_getpos(ZDR *zdrs)
  46 {
  47         return zdrs->pos;
  48 }
  49
  50 void libnfs_zdrmem_create(ZDR *zdrs, const caddr_t addr, uint32_t size, enum zdr_op xop)
  51 {
  52         zdrs->x_op = xop;
  53         zdrs->buf  = addr;
  54         zdrs->size = size;
  55         zdrs->pos  = 0;
  56         zdrs->mem = NULL;
  57 }
  58
  59 static void *zdr_malloc(ZDR *zdrs, uint32_t size)
  60 {
  61         struct zdr_mem *mem;
  62
  63         mem = malloc(sizeof(struct zdr_mem));
  64         mem->next = zdrs->mem;
  65         mem->size = size;
  66         mem->buf  = malloc(mem->size);
  67         zdrs->mem = mem;
  68
  69         return mem->buf;
  70 }
  71
  72 void libnfs_zdr_destroy(ZDR *zdrs)
  73 {
  74         while (zdrs->mem != NULL) {
  75                 struct zdr_mem *mem = zdrs->mem->next;
  76                 free(zdrs->mem->buf);
  77                 free(zdrs->mem);
  78                 zdrs->mem = mem;
  79         }
  80 }
  81
  82 bool_t libnfs_zdr_u_int(ZDR *zdrs, uint32_t *u)
  83 {
  84         if (zdrs->pos + 4 > zdrs->size) {
  85                 return FALSE;
  86         }
  87
  88         switch (zdrs->x_op) {
  89         case ZDR_ENCODE:
  90                 *(uint32_t *)&zdrs->buf[zdrs->pos] = htonl(*u);
  91                 zdrs->pos += 4;
  92                 return TRUE;
  93                 break;
  94         case ZDR_DECODE:
  95                 *u = ntohl(*(uint32_t *)&zdrs->buf[zdrs->pos]);
  96                 zdrs->pos += 4;
  97                 return TRUE;
  98                 break;
  99         }
 100
 101         return FALSE;
 102 }
 103
 104 bool_t libnfs_zdr_int(ZDR *zdrs, int32_t *i)
 105 {
 106         return libnfs_zdr_u_int(zdrs, (uint32_t *)i);
 107 }
 108
 109 bool_t libnfs_zdr_u_quad_t(ZDR *zdrs, uint64_t *u)
 110 {
 111         if (zdrs->pos + 8 > zdrs->size) {
 112                 return FALSE;
 113         }
 114
 115         switch (zdrs->x_op) {
 116         case ZDR_ENCODE:
 117                 *(uint32_t *)&zdrs->buf[zdrs->pos] = htonl((*u >> 32));
 118                 zdrs->pos += 4;
 119                 *(uint32_t *)&zdrs->buf[zdrs->pos] = htonl((*u & 0xffffffff));
 120                 zdrs->pos += 4;
 121                 return TRUE;
 122                 break;
 123         case ZDR_DECODE:
 124                 *u = ntohl(*(uint32_t *)&zdrs->buf[zdrs->pos]);
 125                 zdrs->pos += 4;
 126                 *u <<= 32;
 127                 *u |= ntohl(*(uint32_t *)&zdrs->buf[zdrs->pos]);
 128                 zdrs->pos += 4;
 129                 return TRUE;
 130                 break;
 131         }
 132
 133         return FALSE;
 134 }
 135
 136 bool_t libnfs_zdr_quad_t(ZDR *zdrs, int64_t *i)
 137 {
 138         return libnfs_zdr_u_quad_t(zdrs, (uint64_t *)i);
 139 }
 140
 141 bool_t libnfs_zdr_bytes(ZDR *zdrs, char **bufp, uint32_t *size, uint32_t maxsize)
 142 {
 143         if (!libnfs_zdr_u_int(zdrs, size)) {
 144                 return FALSE;
 145         }
 146
 147         if (zdrs->pos + *size > zdrs->size) {
 148                 return FALSE;
 149         }
 150
 151         switch (zdrs->x_op) {
 152         case ZDR_ENCODE:
 153                 memcpy(&zdrs->buf[zdrs->pos], *bufp, *size);
 154                 zdrs->pos += *size;
 155                 zdrs->pos = (zdrs->pos + 3) & ~3;
 156                 return TRUE;
 157         case ZDR_DECODE:
 158                 if (*bufp == NULL) {
 159                         *bufp = zdr_malloc(zdrs, *size);
 160                 }
 161                 memcpy(*bufp, &zdrs->buf[zdrs->pos], *size);
 162                 zdrs->pos += *size;
 163                 zdrs->pos = (zdrs->pos + 3) & ~3;
 164                 return TRUE;
 165         }
 166
 167         return FALSE;
 168 }
 169
 170
 171 bool_t libnfs_zdr_enum(ZDR *zdrs, enum_t *e)
 172 {
 173         bool_t ret;
 174         int32_t i = *e;
 175
 176         ret = libnfs_zdr_u_int(zdrs, (uint32_t *)&i);
 177         *e = i;
 178
 179         return ret;
 180 }
 181
 182 bool_t libnfs_zdr_bool(ZDR *zdrs, bool_t *b)
 183 {
 184         return libnfs_zdr_u_int(zdrs, (uint32_t *)b);
 185 }
 186
 187 bool_t libnfs_zdr_void(void)
 188 {
 189         return TRUE;
 190 }
 191
 192 bool_t libnfs_zdr_pointer(ZDR *zdrs, char **objp, uint32_t size, zdrproc_t proc)
 193 {
 194         bool_t more_data;
 195
 196         more_data = (*objp != NULL);
 197
 198         if (!libnfs_zdr_bool(zdrs, &more_data)) {
 199                 return FALSE;
 200         }
 201         if (more_data == 0) {
 202                 *objp = NULL;
 203                 return TRUE;
 204         }
 205
 206         if (zdrs->x_op == ZDR_DECODE) {
 207                 *objp = zdr_malloc(zdrs, size);
 208                 if (*objp == NULL) {
 209                         return FALSE;
 210                 }
 211                 memset(*objp, 0, size);
 212         }
 213         return proc(zdrs, *objp);
 214 }
 215
 216 bool_t libnfs_zdr_opaque(ZDR *zdrs, char *objp, uint32_t size)
 217 {
 218         switch (zdrs->x_op) {
 219         case ZDR_ENCODE:
 220                 memcpy(&zdrs->buf[zdrs->pos], objp, size);
 221                 zdrs->pos += size;
 222                 zdrs->pos = (zdrs->pos + 3) & ~3;
 223                 return TRUE;
 224         case ZDR_DECODE:
 225                 memcpy(objp, &zdrs->buf[zdrs->pos], size);
 226                 zdrs->pos += size;
 227                 zdrs->pos = (zdrs->pos + 3) & ~3;
 228                 return TRUE;
 229         }
 230
 231         return FALSE;
 232 }
 233
 234 bool_t libnfs_zdr_string(ZDR *zdrs, char **strp, uint32_t maxsize)
 235 {
 236         uint32_t size;
 237
 238         if (zdrs->x_op == ZDR_ENCODE) {
 239                 size = strlen(*strp);
 240         }
 241
 242         if (!libnfs_zdr_u_int(zdrs, &size)) {
 243                 return FALSE;
 244         }
 245
 246         if (zdrs->pos + size > zdrs->size) {
 247                 return FALSE;
 248         }
 249
 250         switch (zdrs->x_op) {
 251         case ZDR_ENCODE:
 252                 return libnfs_zdr_opaque(zdrs, *strp, size);
 253         case ZDR_DECODE:
 254                 *strp = zdr_malloc(zdrs, size + 1);
 255                 if (*strp == NULL) {
 256                         return FALSE;
 257                 }
 258                 (*strp)[size] = 0;
 259                 return libnfs_zdr_opaque(zdrs, *strp, size);
 260         }
 261
 262         return FALSE;
 263 }
 264
 265 bool_t libnfs_zdr_array(ZDR *zdrs, char **arrp, uint32_t *size, uint32_t maxsize, uint32_t elsize, zdrproc_t proc)
 266 {
 267         int  i;
 268
 269         if (!libnfs_zdr_u_int(zdrs, size)) {
 270                 return FALSE;
 271         }
 272
 273         if (zdrs->pos + *size * elsize > zdrs->size) {
 274                 return FALSE;
 275         }
 276
 277         if (zdrs->x_op == ZDR_DECODE) {
 278                 *arrp = zdr_malloc(zdrs, *size * elsize);
 279                 if (*arrp == NULL) {
 280                         return FALSE;
 281                 }
 282                 memset(*arrp, 0, *size * elsize);
 283         }
 284
 285         for (i = 0; i < *size; i++) {
 286                 if (!proc(zdrs, *arrp + i * elsize)) {
 287                         return FALSE;
 288                 }
 289         }
 290         return TRUE;
 291 }
 292
 293 void libnfs_zdr_free(zdrproc_t proc, char *objp)
 294 {
 295 }
 296
 297 static bool_t libnfs_opaque_auth(ZDR *zdrs, struct opaque_auth *auth)
 298 {
 299         if (!libnfs_zdr_u_int(zdrs, &auth->oa_flavor)) {
 300                 return FALSE;
 301         }
 302
 303         if (!libnfs_zdr_bytes(zdrs, &auth->oa_base, &auth->oa_length, auth->oa_length)) {
 304                 return FALSE;
 305         }
 306
 307         return TRUE;
 308 }
 309
 310 static bool_t libnfs_rpc_call_body(ZDR *zdrs, struct call_body *cmb)
 311 {
 312         if (!libnfs_zdr_u_int(zdrs, &cmb->rpcvers)) {
 313                 return FALSE;
 314         }
 315
 316         if (!libnfs_zdr_u_int(zdrs, &cmb->prog)) {
 317                 return FALSE;
 318         }
 319
 320         if (!libnfs_zdr_u_int(zdrs, &cmb->vers)) {
 321                 return FALSE;
 322         }
 323
 324         if (!libnfs_zdr_u_int(zdrs, &cmb->proc)) {
 325                 return FALSE;
 326         }
 327
 328         if (!libnfs_opaque_auth(zdrs, &cmb->cred)) {
 329                 return FALSE;
 330         }
 331
 332         if (!libnfs_opaque_auth(zdrs, &cmb->verf)) {
 333                 return FALSE;
 334         }
 335
 336         return TRUE;
 337 }
 338
 339 static bool_t libnfs_accepted_reply(ZDR *zdrs, struct accepted_reply *ar)
 340 {
 341         if (!libnfs_opaque_auth(zdrs, &ar->verf)) {
 342                 return FALSE;
 343         }
 344
 345         if (!libnfs_zdr_u_int(zdrs, &ar->stat)) {
 346                 return FALSE;
 347         }
 348
 349         switch (ar->stat) {
 350         case SUCCESS:
 351                 if (!ar->reply_data.results.proc(zdrs, ar->reply_data.results.where)) {
 352                         return FALSE;
 353                 }
 354                 return TRUE;
 355         case PROG_MISMATCH:
 356                 if (!libnfs_zdr_u_int(zdrs, &ar->reply_data.mismatch_info.low)) {
 357                         return FALSE;
 358                 }
 359                 if (!libnfs_zdr_u_int(zdrs, &ar->reply_data.mismatch_info.high)) {
 360                         return FALSE;
 361                 }
 362                 return TRUE;
 363         default:
 364                 return TRUE;
 365         }
 366
 367         return FALSE;
 368 }
 369
 370 static bool_t libnfs_rejected_reply(ZDR *zdrs, struct rejected_reply *rr)
 371 {
 372         if (!libnfs_zdr_u_int(zdrs, &rr->stat)) {
 373                 return FALSE;
 374         }
 375
 376         switch (rr->stat) {
 377         case RPC_MISMATCH:
 378                 if (!libnfs_zdr_u_int(zdrs, &rr->reject_data.mismatch_info.low)) {
 379                         return FALSE;
 380                 }
 381                 if (!libnfs_zdr_u_int(zdrs, &rr->reject_data.mismatch_info.high)) {
 382                         return FALSE;
 383                 }
 384                 return TRUE;
 385         case AUTH_ERROR:
 386                 if (!libnfs_zdr_u_int(zdrs, &rr->reject_data.stat)) {
 387                         return FALSE;
 388                 }
 389                 return TRUE;
 390         default:
 391                 return TRUE;
 392         }
 393
 394         return FALSE;
 395 }
 396
 397 static bool_t libnfs_rpc_reply_body(ZDR *zdrs, struct reply_body *rmb)
 398 {
 399         if (!libnfs_zdr_u_int(zdrs, &rmb->stat)) {
 400                 return FALSE;
 401         }
 402
 403         switch (rmb->stat) {
 404         case MSG_ACCEPTED:
 405                 if (!libnfs_accepted_reply(zdrs, &rmb->reply.areply)) {
 406                         return FALSE;
 407                 }
 408                 return TRUE;
 409         case MSG_DENIED:
 410                 if (!libnfs_rejected_reply(zdrs, &rmb->reply.rreply)) {
 411                         return FALSE;
 412                 }
 413                 return TRUE;
 414         }
 415
 416         return FALSE;
 417 }
 418
 419 static bool_t libnfs_rpc_msg(ZDR *zdrs, struct rpc_msg *msg)
 420 {
 421         if (!libnfs_zdr_u_int(zdrs, &msg->xid)) {
 422                 return FALSE;
 423         }
 424
 425         if (!libnfs_zdr_u_int(zdrs, &msg->direction)) {
 426                 return FALSE;
 427         }
 428
 429         switch (msg->direction) {
 430         case CALL:
 431                 return libnfs_rpc_call_body(zdrs, &msg->body.cbody);
 432                 break;
 433         case REPLY:
 434                 return libnfs_rpc_reply_body(zdrs, &msg->body.rbody);
 435                 break;
 436         default:
 437                 return FALSE;
 438         }
 439 }
 440
 441 bool_t libnfs_zdr_callmsg(ZDR *zdrs, struct rpc_msg *msg)
 442 {
 443         return libnfs_rpc_msg(zdrs, msg);
 444 }
 445
 446 bool_t libnfs_zdr_replymsg(ZDR *zdrs, struct rpc_msg *msg)
 447 {
 448         return libnfs_rpc_msg(zdrs, msg);
 449 }
 450
 451 struct AUTH *authnone_create(void)
 452 {
 453         struct AUTH *auth;
 454
 455         auth = malloc(sizeof(struct AUTH));
 456
 457         auth->ah_cred.oa_flavor = AUTH_NONE;
 458         auth->ah_cred.oa_length = 0;
 459         auth->ah_cred.oa_base = NULL;
 460
 461         auth->ah_verf.oa_flavor = AUTH_NONE;
 462         auth->ah_verf.oa_length = 0;
 463         auth->ah_verf.oa_base = NULL;
 464
 465         auth->ah_private = NULL;
 466
 467         return auth;
 468 }
 469
 470 struct AUTH *libnfs_authunix_create(char *host, uint32_t uid, uint32_t gid, uint32_t len, uint32_t *groups)
 471 {
 472         struct AUTH *auth;
 473         int size;
 474         uint32_t *buf;
 475         int idx;
 476
 477         size = 4 + 4 + ((strlen(host) + 3) & ~3) + 4 + 4 + 4 + len * 4;
 478         auth = malloc(sizeof(struct AUTH));
 479         auth->ah_cred.oa_flavor = AUTH_UNIX;
 480         auth->ah_cred.oa_length = size;
 481         auth->ah_cred.oa_base = malloc(size);
 482
 483         buf = (uint32_t *)auth->ah_cred.oa_base;
 484         idx = 0;
 485         buf[idx++] = htonl(time(NULL));
 486         buf[idx++] = htonl(strlen(host));
 487         memcpy(&buf[2], host, strlen(host));
 488
 489         idx += (strlen(host) + 3) >> 2;
 490         buf[idx++] = htonl(uid);
 491         buf[idx++] = htonl(gid);
 492         buf[idx++] = htonl(len);
 493         while (len-- > 0) {
 494                 buf[idx++] = htonl(*groups++);
 495         }
 496
 497         auth->ah_verf.oa_flavor = AUTH_NONE;
 498         auth->ah_verf.oa_length = 0;
 499         auth->ah_verf.oa_base = NULL;
 500
 501         auth->ah_private = NULL;
 502
 503         return auth;
 504 }
 505
 506 struct AUTH *libnfs_authunix_create_default(void)
 507 {
 508 #ifdef WIN32
 509         return libnfs_authunix_create("libnfs", 65534, 65534, 0, NULL);
 510 #else
 511         return libnfs_authunix_create("libnfs", getuid(), getgid(), 0, NULL);
 512 #endif
 513 }
 514
 515 void libnfs_auth_destroy(struct AUTH *auth)
 516 {
 517         if (auth->ah_cred.oa_base) {
 518                 free(auth->ah_cred.oa_base);
 519         }
 520         if (auth->ah_verf.oa_base) {
 521                 free(auth->ah_verf.oa_base);
 522         }
 523         free(auth);
 524 }
 525