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
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include "libnfs-zdr.h"
  27
  28 struct opaque_auth _null_auth;
  29
  30 bool_t libnfs_zdr_setpos(ZDR *zdrs, uint32_t pos)
  31 {
  32         zdrs->pos = pos;
  33
  34         return TRUE;
  35 }
  36
  37 uint32_t libnfs_zdr_getpos(ZDR *zdrs)
  38 {
  39         return zdrs->pos;
  40 }
  41
  42 void libnfs_zdrmem_create(ZDR *zdrs, const caddr_t addr, uint32_t size, enum zdr_op xop)
  43 {
  44         zdrs->x_op = xop;
  45         zdrs->buf  = addr;
  46         zdrs->size = size;
  47         zdrs->pos  = 0;
  48         zdrs->mem = NULL;
  49 }
  50
  51 static void *zdr_malloc(ZDR *zdrs, uint32_t size)
  52 {
  53         struct zdr_mem *mem;
  54
  55         mem = malloc(sizeof(struct zdr_mem));
  56         mem->next = zdrs->mem;
  57         mem->size = size;
  58         mem->buf  = malloc(mem->size);
  59         zdrs->mem = mem;
  60
  61         return mem->buf;
  62 }
  63
  64 void libnfs_zdr_destroy(ZDR *zdrs)
  65 {
  66         while (zdrs->mem != NULL) {
  67                 struct zdr_mem *mem = zdrs->mem->next;
  68                 free(zdrs->mem->buf);
  69                 free(zdrs->mem);
  70                 zdrs->mem = mem;
  71         }
  72 }
  73
  74 bool_t libnfs_zdr_u_int(ZDR *zdrs, uint32_t *u)
  75 {
  76         if (zdrs->pos + 4 > zdrs->size) {
  77                 return FALSE;
  78         }
  79
  80         switch (zdrs->x_op) {
  81         case ZDR_ENCODE:
  82                 *(uint32_t *)&zdrs->buf[zdrs->pos] = htonl(*u);
  83                 zdrs->pos += 4;
  84                 return TRUE;
  85                 break;
  86         case ZDR_DECODE:
  87                 *u = ntohl(*(uint32_t *)&zdrs->buf[zdrs->pos]);
  88                 zdrs->pos += 4;
  89                 return TRUE;
  90                 break;
  91         }
  92
  93         return FALSE;
  94 }
  95
  96 bool_t libnfs_zdr_int(ZDR *zdrs, int32_t *i)
  97 {
  98         return libnfs_zdr_u_int(zdrs, (uint32_t *)i);
  99 }
 100
 101 bool_t libnfs_zdr_u_quad_t(ZDR *zdrs, uint64_t *u)
 102 {
 103         if (zdrs->pos + 8 > zdrs->size) {
 104                 return FALSE;
 105         }
 106
 107         switch (zdrs->x_op) {
 108         case ZDR_ENCODE:
 109                 *(uint32_t *)&zdrs->buf[zdrs->pos] = htonl((*u >> 32));
 110                 zdrs->pos += 4;
 111                 *(uint32_t *)&zdrs->buf[zdrs->pos] = htonl((*u & 0xffffffff));
 112                 zdrs->pos += 4;
 113                 return TRUE;
 114                 break;
 115         case ZDR_DECODE:
 116                 *u = ntohl(*(uint32_t *)&zdrs->buf[zdrs->pos]);
 117                 zdrs->pos += 4;
 118                 *u <<= 32;
 119                 *u |= ntohl(*(uint32_t *)&zdrs->buf[zdrs->pos]);
 120                 zdrs->pos += 4;
 121                 return TRUE;
 122                 break;
 123         }
 124
 125         return FALSE;
 126 }
 127
 128 bool_t libnfs_zdr_quad_t(ZDR *zdrs, int64_t *i)
 129 {
 130         return libnfs_zdr_u_quad_t(zdrs, (uint64_t *)i);
 131 }
 132
 133 bool_t libnfs_zdr_bytes(ZDR *zdrs, char **bufp, uint32_t *size, uint32_t maxsize)
 134 {
 135         if (!libnfs_zdr_u_int(zdrs, size)) {
 136                 return FALSE;
 137         }
 138
 139         if (zdrs->pos + *size > zdrs->size) {
 140                 return FALSE;
 141         }
 142
 143         switch (zdrs->x_op) {
 144         case ZDR_ENCODE:
 145                 memcpy(&zdrs->buf[zdrs->pos], *bufp, *size);
 146                 zdrs->pos += *size;
 147                 zdrs->pos = (zdrs->pos + 3) & ~3;
 148                 return TRUE;
 149         case ZDR_DECODE:
 150                 if (*bufp == NULL) {
 151                         *bufp = zdr_malloc(zdrs, *size);
 152                 }
 153                 memcpy(*bufp, &zdrs->buf[zdrs->pos], *size);
 154                 zdrs->pos += *size;
 155                 zdrs->pos = (zdrs->pos + 3) & ~3;
 156                 return TRUE;
 157         }
 158
 159         return FALSE;
 160 }
 161
 162
 163 bool_t libnfs_zdr_enum(ZDR *zdrs, int32_t *e)
 164 {
 165         return libnfs_zdr_u_int(zdrs, (uint32_t *)e);
 166 }
 167
 168 bool_t libnfs_zdr_bool(ZDR *zdrs, bool_t *b)
 169 {
 170         return libnfs_zdr_u_int(zdrs, (uint32_t *)b);
 171 }
 172
 173 bool_t libnfs_zdr_void(void)
 174 {
 175         return TRUE;
 176 }
 177
 178 bool_t libnfs_zdr_pointer(ZDR *zdrs, char **objp, uint32_t size, zdrproc_t proc)
 179 {
 180         bool_t more_data;
 181
 182         more_data = (*objp != NULL);
 183
 184         if (!libnfs_zdr_bool(zdrs, &more_data)) {
 185                 return FALSE;
 186         }
 187         if (more_data == 0) {
 188                 *objp = NULL;
 189                 return TRUE;
 190         }
 191
 192         if (zdrs->x_op == ZDR_DECODE) {
 193                 *objp = zdr_malloc(zdrs, size);
 194                 if (*objp == NULL) {
 195                         return FALSE;
 196                 }
 197                 memset(*objp, 0, size);
 198         }
 199         return proc(zdrs, *objp);
 200 }
 201
 202 bool_t libnfs_zdr_opaque(ZDR *zdrs, char *objp, uint32_t size)
 203 {
 204         switch (zdrs->x_op) {
 205         case ZDR_ENCODE:
 206                 memcpy(&zdrs->buf[zdrs->pos], objp, size);
 207                 zdrs->pos += size;
 208                 zdrs->pos = (zdrs->pos + 3) & ~3;
 209                 return TRUE;
 210         case ZDR_DECODE:
 211                 memcpy(objp, &zdrs->buf[zdrs->pos], size);
 212                 zdrs->pos += size;
 213                 zdrs->pos = (zdrs->pos + 3) & ~3;
 214                 return TRUE;
 215         }
 216
 217         return FALSE;
 218 }
 219
 220 bool_t libnfs_zdr_string(ZDR *zdrs, char **strp, uint32_t maxsize)
 221 {
 222         uint32_t size;
 223
 224         if (zdrs->x_op == ZDR_ENCODE) {
 225                 size = strlen(*strp);
 226         }
 227
 228         if (!libnfs_zdr_u_int(zdrs, &size)) {
 229                 return FALSE;
 230         }
 231
 232         if (zdrs->pos + size > zdrs->size) {
 233                 return FALSE;
 234         }
 235
 236         switch (zdrs->x_op) {
 237         case ZDR_ENCODE:
 238                 return libnfs_zdr_opaque(zdrs, *strp, size);
 239         case ZDR_DECODE:
 240                 *strp = zdr_malloc(zdrs, size + 1);
 241                 if (*strp == NULL) {
 242                         return FALSE;
 243                 }
 244                 (*strp)[size] = 0;
 245                 return libnfs_zdr_opaque(zdrs, *strp, size);
 246         }
 247
 248         return FALSE;
 249 }
 250
 251 bool_t libnfs_zdr_array(ZDR *zdrs, char **arrp, uint32_t *size, uint32_t maxsize, uint32_t elsize, zdrproc_t proc)
 252 {
 253         int  i;
 254
 255         if (!libnfs_zdr_u_int(zdrs, size)) {
 256                 return FALSE;
 257         }
 258
 259         if (zdrs->pos + *size * elsize > zdrs->size) {
 260                 return FALSE;
 261         }
 262
 263         if (zdrs->x_op == ZDR_DECODE) {
 264                 *arrp = zdr_malloc(zdrs, *size * elsize);
 265                 if (*arrp == NULL) {
 266                         return FALSE;
 267                 }
 268                 memset(*arrp, 0, *size * elsize);
 269         }
 270
 271         for (i = 0; i < *size; i++) {
 272                 if (proc(zdrs, *arrp + i * elsize)) {
 273                         return FALSE;
 274                 }
 275         }
 276         return TRUE;
 277 }
 278
 279 void libnfs_zdr_free(zdrproc_t proc, char *objp)
 280 {
 281 }
 282
 283 static bool_t libnfs_opaque_auth(ZDR *zdrs, struct opaque_auth *auth)
 284 {
 285         if (!libnfs_zdr_u_int(zdrs, &auth->oa_flavor)) {
 286                 return FALSE;
 287         }
 288
 289         if (!libnfs_zdr_bytes(zdrs, &auth->oa_base, &auth->oa_length, auth->oa_length)) {
 290                 return FALSE;
 291         }
 292
 293         return TRUE;
 294 }
 295
 296 static bool_t libnfs_rpc_call_body(ZDR *zdrs, struct call_body *cmb)
 297 {
 298         if (!libnfs_zdr_u_int(zdrs, &cmb->cb_rpcvers)) {
 299                 return FALSE;
 300         }
 301
 302         if (!libnfs_zdr_u_int(zdrs, &cmb->cb_prog)) {
 303                 return FALSE;
 304         }
 305
 306         if (!libnfs_zdr_u_int(zdrs, &cmb->cb_vers)) {
 307                 return FALSE;
 308         }
 309
 310         if (!libnfs_zdr_u_int(zdrs, &cmb->cb_proc)) {
 311                 return FALSE;
 312         }
 313
 314         if (!libnfs_opaque_auth(zdrs, &cmb->cb_cred)) {
 315                 return FALSE;
 316         }
 317
 318         if (!libnfs_opaque_auth(zdrs, &cmb->cb_verf)) {
 319                 return FALSE;
 320         }
 321
 322         return TRUE;
 323 }
 324
 325 static bool_t libnfs_accepted_reply(ZDR *zdrs, struct accepted_reply *ar)
 326 {
 327         if (!libnfs_opaque_auth(zdrs, &ar->ar_verf)) {
 328                 return FALSE;
 329         }
 330
 331         if (!libnfs_zdr_u_int(zdrs, &ar->ar_stat)) {
 332                 return FALSE;
 333         }
 334
 335         switch (ar->ar_stat) {
 336         case SUCCESS:
 337                 if (!ar->ar_results.proc(zdrs, ar->ar_results.where)) {
 338                         return FALSE;
 339                 }
 340                 return TRUE;
 341         case PROG_MISMATCH:
 342                 if (!libnfs_zdr_u_int(zdrs, &ar->ar_vers.low)) {
 343                         return FALSE;
 344                 }
 345                 if (!libnfs_zdr_u_int(zdrs, &ar->ar_vers.high)) {
 346                         return FALSE;
 347                 }
 348                 return TRUE;
 349         default:
 350                 return TRUE;
 351         }
 352
 353         return FALSE;
 354 }
 355
 356 static bool_t libnfs_rejected_reply(ZDR *zdrs, struct rejected_reply *RP_dr)
 357 {
 358 printf("rejected reply\n");
 359 exit(10);
 360 }
 361
 362 static bool_t libnfs_rpc_reply_body(ZDR *zdrs, struct reply_body *rmb)
 363 {
 364         if (!libnfs_zdr_u_int(zdrs, &rmb->rp_stat)) {
 365                 return FALSE;
 366         }
 367
 368         switch (rmb->rp_stat) {
 369         case MSG_ACCEPTED:
 370                 if (!libnfs_accepted_reply(zdrs, &rmb->rp_acpt)) {
 371                         return FALSE;
 372                 }
 373                 return TRUE;
 374         case MSG_DENIED:
 375                 if (!libnfs_rejected_reply(zdrs, &rmb->rp_rjct)) {
 376                         return FALSE;
 377                 }
 378                 return TRUE;
 379         }
 380
 381         return FALSE;
 382 }
 383
 384 static bool_t libnfs_rpc_msg(ZDR *zdrs, struct rpc_msg *msg)
 385 {
 386         if (!libnfs_zdr_u_int(zdrs, &msg->rm_xid)) {
 387                 return FALSE;
 388         }
 389
 390         if (!libnfs_zdr_u_int(zdrs, &msg->rm_direction)) {
 391                 return FALSE;
 392         }
 393
 394         switch (msg->rm_direction) {
 395         case CALL:
 396                 return libnfs_rpc_call_body(zdrs, &msg->ru.RM_cmb);
 397                 break;
 398         case REPLY:
 399                 return libnfs_rpc_reply_body(zdrs, &msg->ru.RM_rmb);
 400                 break;
 401         default:
 402                 return FALSE;
 403         }
 404 }
 405
 406 bool_t libnfs_zdr_callmsg(ZDR *zdrs, struct rpc_msg *msg)
 407 {
 408         return libnfs_rpc_msg(zdrs, msg);
 409 }
 410
 411 bool_t libnfs_zdr_replymsg(ZDR *zdrs, struct rpc_msg *msg)
 412 {
 413         return libnfs_rpc_msg(zdrs, msg);
 414 }
 415
 416 AUTH *authnone_create(void)
 417 {
 418         AUTH *auth;
 419
 420         auth = malloc(sizeof(AUTH));
 421
 422         auth->ah_cred.oa_flavor = AUTH_NONE;
 423         auth->ah_cred.oa_length = 0;
 424         auth->ah_cred.oa_base = NULL;
 425
 426         auth->ah_verf.oa_flavor = AUTH_NONE;
 427         auth->ah_verf.oa_length = 0;
 428         auth->ah_verf.oa_base = NULL;
 429
 430         auth->ah_private = NULL;
 431
 432         return auth;
 433 }
 434
 435 AUTH *libnfs_authunix_create(char *host, uint32_t uid, uint32_t gid, uint32_t len, uint32_t *groups)
 436 {
 437         AUTH *auth;
 438         int size;
 439         uint32_t *buf;
 440         int idx;
 441
 442         size = 4 + 4 + ((strlen(host) + 3) & ~3) + 4 + 4 + 4 + len * 4;
 443         auth = malloc(sizeof(AUTH));
 444         auth->ah_cred.oa_flavor = AUTH_UNIX;
 445         auth->ah_cred.oa_length = size;
 446         auth->ah_cred.oa_base = malloc(size);
 447
 448         buf = (uint32_t *)auth->ah_cred.oa_base;
 449         idx = 0;
 450         buf[idx++] = htonl(time(NULL));
 451         buf[idx++] = htonl(strlen(host));
 452         memcpy(&buf[2], host, strlen(host));
 453
 454         idx += (strlen(host) + 3) >> 2;
 455         buf[idx++] = htonl(uid);
 456         buf[idx++] = htonl(gid);
 457         buf[idx++] = htonl(len);
 458         while (len-- > 0) {
 459                 buf[idx++] = htonl(*groups++);
 460         }
 461
 462         auth->ah_verf.oa_flavor = AUTH_NONE;
 463         auth->ah_verf.oa_length = 0;
 464         auth->ah_verf.oa_base = NULL;
 465
 466         auth->ah_private = NULL;
 467
 468         return auth;
 469 }
 470
 471 AUTH *libnfs_authunix_create_default(void)
 472 {
 473         return libnfs_authunix_create("libnfs", getuid(), -1, 0, NULL);
 474 }
 475
 476 void libnfs_auth_destroy(AUTH *auth)
 477 {
 478         if (auth->ah_cred.oa_base) {
 479                 free(auth->ah_cred.oa_base);
 480         }
 481         if (auth->ah_verf.oa_base) {
 482                 free(auth->ah_verf.oa_base);
 483         }
 484         free(auth);
 485 }
 486