| 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 = 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 | |