| 1 | /* |
| 2 | * HCLINK.C |
| 3 | * |
| 4 | * This module implements a simple remote control protocol |
| 5 | * |
| 6 | * $DragonFly: src/bin/cpdup/hclink.c,v 1.10 2008/05/24 17:21:36 dillon Exp $ |
| 7 | */ |
| 8 | |
| 9 | #include "cpdup.h" |
| 10 | #include "hclink.h" |
| 11 | #include "hcproto.h" |
| 12 | |
| 13 | #if USE_PTHREADS |
| 14 | static void * hcc_reader_thread(void *arg); |
| 15 | #endif |
| 16 | static struct HCHead *hcc_read_command(struct HostConf *hc, hctransaction_t trans); |
| 17 | static void hcc_start_reply(hctransaction_t trans, struct HCHead *rhead); |
| 18 | |
| 19 | int |
| 20 | hcc_connect(struct HostConf *hc) |
| 21 | { |
| 22 | int fdin[2]; |
| 23 | int fdout[2]; |
| 24 | const char *av[32]; |
| 25 | |
| 26 | if (hc == NULL || hc->host == NULL) |
| 27 | return(0); |
| 28 | |
| 29 | if (pipe(fdin) < 0) |
| 30 | return(-1); |
| 31 | if (pipe(fdout) < 0) { |
| 32 | close(fdin[0]); |
| 33 | close(fdin[1]); |
| 34 | return(-1); |
| 35 | } |
| 36 | if ((hc->pid = fork()) == 0) { |
| 37 | /* |
| 38 | * Child process |
| 39 | */ |
| 40 | int n, m; |
| 41 | |
| 42 | dup2(fdin[1], 1); |
| 43 | close(fdin[0]); |
| 44 | close(fdin[1]); |
| 45 | dup2(fdout[0], 0); |
| 46 | close(fdout[0]); |
| 47 | close(fdout[1]); |
| 48 | |
| 49 | n = 0; |
| 50 | av[n++] = "ssh"; |
| 51 | if (CompressOpt) |
| 52 | av[n++] = "-C"; |
| 53 | for (m = 0; m < ssh_argc; m++) |
| 54 | av[n++] = ssh_argv[m]; |
| 55 | av[n++] = "-T"; |
| 56 | av[n++] = hc->host; |
| 57 | av[n++] = "cpdup"; |
| 58 | av[n++] = "-S"; |
| 59 | av[n++] = NULL; |
| 60 | |
| 61 | execv("/usr/bin/ssh", (void *)av); |
| 62 | _exit(1); |
| 63 | } else if (hc->pid < 0) { |
| 64 | return(-1); |
| 65 | } else { |
| 66 | /* |
| 67 | * Parent process. Do the initial handshake to make sure we are |
| 68 | * actually talking to a cpdup slave. |
| 69 | */ |
| 70 | close(fdin[1]); |
| 71 | hc->fdin = fdin[0]; |
| 72 | close(fdout[0]); |
| 73 | hc->fdout = fdout[1]; |
| 74 | #if USE_PTHREADS |
| 75 | pthread_create(&hc->reader_thread, NULL, hcc_reader_thread, hc); |
| 76 | #endif |
| 77 | return(0); |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | static int |
| 82 | rc_badop(hctransaction_t trans __unused, struct HCHead *head) |
| 83 | { |
| 84 | head->error = EOPNOTSUPP; |
| 85 | return(0); |
| 86 | } |
| 87 | |
| 88 | int |
| 89 | hcc_slave(int fdin, int fdout, struct HCDesc *descs, int count) |
| 90 | { |
| 91 | struct HostConf hcslave; |
| 92 | struct HCHead *head; |
| 93 | struct HCHead *whead; |
| 94 | struct HCTransaction trans; |
| 95 | int (*dispatch[256])(hctransaction_t, struct HCHead *); |
| 96 | int aligned_bytes; |
| 97 | int i; |
| 98 | int r; |
| 99 | |
| 100 | bzero(&hcslave, sizeof(hcslave)); |
| 101 | bzero(&trans, sizeof(trans)); |
| 102 | for (i = 0; i < count; ++i) { |
| 103 | struct HCDesc *desc = &descs[i]; |
| 104 | assert(desc->cmd >= 0 && desc->cmd < 256); |
| 105 | dispatch[desc->cmd] = desc->func; |
| 106 | } |
| 107 | for (i = 0; i < 256; ++i) { |
| 108 | if (dispatch[i] == NULL) |
| 109 | dispatch[i] = rc_badop; |
| 110 | } |
| 111 | hcslave.fdin = fdin; |
| 112 | hcslave.fdout = fdout; |
| 113 | trans.hc = &hcslave; |
| 114 | |
| 115 | #if USE_PTHREADS |
| 116 | pthread_mutex_unlock(&MasterMutex); |
| 117 | #endif |
| 118 | /* |
| 119 | * Process commands on fdin and write out results on fdout |
| 120 | */ |
| 121 | for (;;) { |
| 122 | /* |
| 123 | * Get the command |
| 124 | */ |
| 125 | head = hcc_read_command(trans.hc, &trans); |
| 126 | if (head == NULL) |
| 127 | break; |
| 128 | |
| 129 | /* |
| 130 | * Start the reply and dispatch, then process the return code. |
| 131 | */ |
| 132 | head->error = 0; |
| 133 | hcc_start_reply(&trans, head); |
| 134 | |
| 135 | r = dispatch[head->cmd & 255](&trans, head); |
| 136 | |
| 137 | switch(r) { |
| 138 | case -2: |
| 139 | head->error = EINVAL; |
| 140 | break; |
| 141 | case -1: |
| 142 | head->error = errno; |
| 143 | break; |
| 144 | case 0: |
| 145 | break; |
| 146 | default: |
| 147 | assert(0); |
| 148 | break; |
| 149 | } |
| 150 | |
| 151 | /* |
| 152 | * Write out the reply |
| 153 | */ |
| 154 | whead = (void *)trans.wbuf; |
| 155 | whead->bytes = trans.windex; |
| 156 | whead->error = head->error; |
| 157 | aligned_bytes = HCC_ALIGN(trans.windex); |
| 158 | #ifdef DEBUG |
| 159 | hcc_debug_dump(whead); |
| 160 | #endif |
| 161 | if (write(hcslave.fdout, whead, aligned_bytes) != aligned_bytes) |
| 162 | break; |
| 163 | } |
| 164 | return(0); |
| 165 | } |
| 166 | |
| 167 | #if USE_PTHREADS |
| 168 | /* |
| 169 | * This thread collects responses from the link. It is run without |
| 170 | * the MasterMutex. |
| 171 | */ |
| 172 | static void * |
| 173 | hcc_reader_thread(void *arg) |
| 174 | { |
| 175 | struct HostConf *hc = arg; |
| 176 | struct HCHead *rhead; |
| 177 | hctransaction_t scan; |
| 178 | int i; |
| 179 | |
| 180 | pthread_detach(pthread_self()); |
| 181 | while (hcc_read_command(hc, NULL) != NULL) |
| 182 | ; |
| 183 | hc->reader_thread = NULL; |
| 184 | |
| 185 | /* |
| 186 | * Clean up any threads stuck waiting for a reply. |
| 187 | */ |
| 188 | pthread_mutex_lock(&MasterMutex); |
| 189 | for (i = 0; i < HCTHASH_SIZE; ++i) { |
| 190 | pthread_mutex_lock(&hc->hct_mutex[i]); |
| 191 | for (scan = hc->hct_hash[i]; scan; scan = scan->next) { |
| 192 | if (scan->state == HCT_SENT) { |
| 193 | scan->state = HCT_REPLIED; |
| 194 | rhead = (void *)scan->rbuf; |
| 195 | rhead->error = ENOTCONN; |
| 196 | if (scan->waiting) |
| 197 | pthread_cond_signal(&scan->cond); |
| 198 | } |
| 199 | } |
| 200 | pthread_mutex_unlock(&hc->hct_mutex[i]); |
| 201 | } |
| 202 | pthread_mutex_unlock(&MasterMutex); |
| 203 | return(NULL); |
| 204 | } |
| 205 | |
| 206 | #endif |
| 207 | |
| 208 | /* |
| 209 | * This reads a command from fdin, fixes up the byte ordering, and returns |
| 210 | * a pointer to HCHead. |
| 211 | * |
| 212 | * The MasterMutex may or may not be held. When threaded this command |
| 213 | * is serialized by a reader thread. |
| 214 | */ |
| 215 | static |
| 216 | struct HCHead * |
| 217 | hcc_read_command(struct HostConf *hc, hctransaction_t trans) |
| 218 | { |
| 219 | hctransaction_t fill; |
| 220 | struct HCHead tmp; |
| 221 | int aligned_bytes; |
| 222 | int n; |
| 223 | int r; |
| 224 | |
| 225 | n = 0; |
| 226 | while (n < (int)sizeof(struct HCHead)) { |
| 227 | r = read(hc->fdin, (char *)&tmp + n, sizeof(struct HCHead) - n); |
| 228 | if (r <= 0) |
| 229 | goto fail; |
| 230 | n += r; |
| 231 | } |
| 232 | |
| 233 | assert(tmp.bytes >= (int)sizeof(tmp) && tmp.bytes < 65536); |
| 234 | assert(tmp.magic == HCMAGIC); |
| 235 | |
| 236 | if (trans) { |
| 237 | fill = trans; |
| 238 | } else { |
| 239 | #if USE_PTHREADS |
| 240 | pthread_mutex_lock(&hc->hct_mutex[tmp.id & HCTHASH_MASK]); |
| 241 | for (fill = hc->hct_hash[tmp.id & HCTHASH_MASK]; |
| 242 | fill; |
| 243 | fill = fill->next) |
| 244 | { |
| 245 | if (fill->state == HCT_SENT && fill->id == tmp.id) |
| 246 | break; |
| 247 | } |
| 248 | pthread_mutex_unlock(&hc->hct_mutex[tmp.id & HCTHASH_MASK]); |
| 249 | if (fill == NULL) |
| 250 | #endif |
| 251 | { |
| 252 | fprintf(stderr, |
| 253 | "cpdup hlink protocol error with %s (%04x)\n", |
| 254 | hc->host, tmp.id); |
| 255 | exit(1); |
| 256 | } |
| 257 | } |
| 258 | |
| 259 | bcopy(&tmp, fill->rbuf, n); |
| 260 | aligned_bytes = HCC_ALIGN(tmp.bytes); |
| 261 | |
| 262 | while (n < aligned_bytes) { |
| 263 | r = read(hc->fdin, fill->rbuf + n, aligned_bytes - n); |
| 264 | if (r <= 0) |
| 265 | goto fail; |
| 266 | n += r; |
| 267 | } |
| 268 | #ifdef DEBUG |
| 269 | hcc_debug_dump(head); |
| 270 | #endif |
| 271 | #if USE_PTHREADS |
| 272 | pthread_mutex_lock(&hc->hct_mutex[fill->id & HCTHASH_MASK]); |
| 273 | #endif |
| 274 | fill->state = HCT_REPLIED; |
| 275 | #if USE_PTHREADS |
| 276 | if (fill->waiting) |
| 277 | pthread_cond_signal(&fill->cond); |
| 278 | pthread_mutex_unlock(&hc->hct_mutex[fill->id & HCTHASH_MASK]); |
| 279 | #endif |
| 280 | return((void *)fill->rbuf); |
| 281 | fail: |
| 282 | return(NULL); |
| 283 | } |
| 284 | |
| 285 | #if USE_PTHREADS |
| 286 | |
| 287 | static |
| 288 | hctransaction_t |
| 289 | hcc_get_trans(struct HostConf *hc) |
| 290 | { |
| 291 | hctransaction_t trans; |
| 292 | hctransaction_t scan; |
| 293 | pthread_t tid = pthread_self(); |
| 294 | int i; |
| 295 | |
| 296 | i = ((intptr_t)tid >> 7) & HCTHASH_MASK; |
| 297 | |
| 298 | pthread_mutex_lock(&hc->hct_mutex[i]); |
| 299 | for (trans = hc->hct_hash[i]; trans; trans = trans->next) { |
| 300 | if (trans->tid == tid) |
| 301 | break; |
| 302 | } |
| 303 | if (trans == NULL) { |
| 304 | trans = malloc(sizeof(*trans)); |
| 305 | bzero(trans, sizeof(*trans)); |
| 306 | trans->tid = tid; |
| 307 | trans->id = i; |
| 308 | pthread_cond_init(&trans->cond, NULL); |
| 309 | do { |
| 310 | for (scan = hc->hct_hash[i]; scan; scan = scan->next) { |
| 311 | if (scan->id == trans->id) { |
| 312 | trans->id += HCTHASH_SIZE; |
| 313 | break; |
| 314 | } |
| 315 | } |
| 316 | } while (scan != NULL); |
| 317 | |
| 318 | trans->next = hc->hct_hash[i]; |
| 319 | hc->hct_hash[i] = trans; |
| 320 | } |
| 321 | pthread_mutex_unlock(&hc->hct_mutex[i]); |
| 322 | return(trans); |
| 323 | } |
| 324 | |
| 325 | void |
| 326 | hcc_free_trans(struct HostConf *hc) |
| 327 | { |
| 328 | hctransaction_t trans; |
| 329 | hctransaction_t *transp; |
| 330 | pthread_t tid = pthread_self(); |
| 331 | int i; |
| 332 | |
| 333 | i = ((intptr_t)tid >> 7) & HCTHASH_MASK; |
| 334 | |
| 335 | pthread_mutex_lock(&hc->hct_mutex[i]); |
| 336 | for (transp = &hc->hct_hash[i]; *transp; transp = &trans->next) { |
| 337 | trans = *transp; |
| 338 | if (trans->tid == tid) { |
| 339 | *transp = trans->next; |
| 340 | pthread_cond_destroy(&trans->cond); |
| 341 | free(trans); |
| 342 | break; |
| 343 | } |
| 344 | } |
| 345 | pthread_mutex_unlock(&hc->hct_mutex[i]); |
| 346 | } |
| 347 | |
| 348 | #else |
| 349 | |
| 350 | static |
| 351 | hctransaction_t |
| 352 | hcc_get_trans(struct HostConf *hc) |
| 353 | { |
| 354 | return(&hc->trans); |
| 355 | } |
| 356 | |
| 357 | void |
| 358 | hcc_free_trans(struct HostConf *hc __unused) |
| 359 | { |
| 360 | /* nop */ |
| 361 | } |
| 362 | |
| 363 | #endif |
| 364 | |
| 365 | /* |
| 366 | * Initialize for a new command |
| 367 | */ |
| 368 | hctransaction_t |
| 369 | hcc_start_command(struct HostConf *hc, int16_t cmd) |
| 370 | { |
| 371 | struct HCHead *whead; |
| 372 | hctransaction_t trans; |
| 373 | |
| 374 | trans = hcc_get_trans(hc); |
| 375 | |
| 376 | whead = (void *)trans->wbuf; |
| 377 | whead->magic = HCMAGIC; |
| 378 | whead->bytes = 0; |
| 379 | whead->cmd = cmd; |
| 380 | whead->id = trans->id; |
| 381 | whead->error = 0; |
| 382 | |
| 383 | trans->windex = sizeof(*whead); |
| 384 | trans->hc = hc; |
| 385 | trans->state = HCT_IDLE; |
| 386 | |
| 387 | return(trans); |
| 388 | } |
| 389 | |
| 390 | static void |
| 391 | hcc_start_reply(hctransaction_t trans, struct HCHead *rhead) |
| 392 | { |
| 393 | struct HCHead *whead = (void *)trans->wbuf; |
| 394 | |
| 395 | whead->magic = HCMAGIC; |
| 396 | whead->bytes = 0; |
| 397 | whead->cmd = rhead->cmd | HCF_REPLY; |
| 398 | whead->id = rhead->id; |
| 399 | whead->error = 0; |
| 400 | |
| 401 | trans->windex = sizeof(*whead); |
| 402 | } |
| 403 | |
| 404 | /* |
| 405 | * Finish constructing a command, transmit it, and await the reply. |
| 406 | * Return the HCHead of the reply. |
| 407 | */ |
| 408 | struct HCHead * |
| 409 | hcc_finish_command(hctransaction_t trans) |
| 410 | { |
| 411 | struct HostConf *hc; |
| 412 | struct HCHead *whead; |
| 413 | struct HCHead *rhead; |
| 414 | int aligned_bytes; |
| 415 | int16_t wcmd; |
| 416 | |
| 417 | hc = trans->hc; |
| 418 | whead = (void *)trans->wbuf; |
| 419 | whead->bytes = trans->windex; |
| 420 | aligned_bytes = HCC_ALIGN(trans->windex); |
| 421 | |
| 422 | trans->state = HCT_SENT; |
| 423 | |
| 424 | if (write(hc->fdout, whead, aligned_bytes) != aligned_bytes) { |
| 425 | #ifdef __error |
| 426 | *__error = EIO; |
| 427 | #else |
| 428 | errno = EIO; |
| 429 | #endif |
| 430 | if (whead->cmd < 0x0010) |
| 431 | return(NULL); |
| 432 | fprintf(stderr, "cpdup lost connection to %s\n", hc->host); |
| 433 | exit(1); |
| 434 | } |
| 435 | |
| 436 | wcmd = whead->cmd; |
| 437 | |
| 438 | /* |
| 439 | * whead is invalid when we call hcc_read_command() because |
| 440 | * we may switch to another thread. |
| 441 | */ |
| 442 | #if USE_PTHREADS |
| 443 | pthread_mutex_unlock(&MasterMutex); |
| 444 | while (trans->state != HCT_REPLIED && hc->reader_thread) { |
| 445 | pthread_mutex_t *mtxp = &hc->hct_mutex[trans->id & HCTHASH_MASK]; |
| 446 | pthread_mutex_lock(mtxp); |
| 447 | trans->waiting = 1; |
| 448 | if (trans->state != HCT_REPLIED && hc->reader_thread) |
| 449 | pthread_cond_wait(&trans->cond, mtxp); |
| 450 | trans->waiting = 0; |
| 451 | pthread_mutex_unlock(mtxp); |
| 452 | } |
| 453 | pthread_mutex_lock(&MasterMutex); |
| 454 | rhead = (void *)trans->rbuf; |
| 455 | #else |
| 456 | rhead = hcc_read_command(hc, trans); |
| 457 | #endif |
| 458 | if (trans->state != HCT_REPLIED || rhead->id != trans->id) { |
| 459 | #ifdef __error |
| 460 | *__error = EIO; |
| 461 | #else |
| 462 | errno = EIO; |
| 463 | #endif |
| 464 | if (wcmd < 0x0010) |
| 465 | return(NULL); |
| 466 | fprintf(stderr, "cpdup lost connection to %s\n", hc->host); |
| 467 | exit(1); |
| 468 | } |
| 469 | trans->state = HCT_DONE; |
| 470 | |
| 471 | if (rhead->error) { |
| 472 | #ifdef __error |
| 473 | *__error = rhead->error; |
| 474 | #else |
| 475 | errno = rhead->error; |
| 476 | #endif |
| 477 | } |
| 478 | return (rhead); |
| 479 | } |
| 480 | |
| 481 | void |
| 482 | hcc_leaf_string(hctransaction_t trans, int16_t leafid, const char *str) |
| 483 | { |
| 484 | struct HCLeaf *item; |
| 485 | int bytes = strlen(str) + 1; |
| 486 | |
| 487 | item = (void *)(trans->wbuf + trans->windex); |
| 488 | assert(trans->windex + sizeof(*item) + bytes < 65536); |
| 489 | item->leafid = leafid; |
| 490 | item->reserved = 0; |
| 491 | item->bytes = sizeof(*item) + bytes; |
| 492 | bcopy(str, item + 1, bytes); |
| 493 | trans->windex = HCC_ALIGN(trans->windex + item->bytes); |
| 494 | } |
| 495 | |
| 496 | void |
| 497 | hcc_leaf_data(hctransaction_t trans, int16_t leafid, const void *ptr, int bytes) |
| 498 | { |
| 499 | struct HCLeaf *item; |
| 500 | |
| 501 | item = (void *)(trans->wbuf + trans->windex); |
| 502 | assert(trans->windex + sizeof(*item) + bytes < 65536); |
| 503 | item->leafid = leafid; |
| 504 | item->reserved = 0; |
| 505 | item->bytes = sizeof(*item) + bytes; |
| 506 | bcopy(ptr, item + 1, bytes); |
| 507 | trans->windex = HCC_ALIGN(trans->windex + item->bytes); |
| 508 | } |
| 509 | |
| 510 | void |
| 511 | hcc_leaf_int32(hctransaction_t trans, int16_t leafid, int32_t value) |
| 512 | { |
| 513 | struct HCLeaf *item; |
| 514 | |
| 515 | item = (void *)(trans->wbuf + trans->windex); |
| 516 | assert(trans->windex + sizeof(*item) + sizeof(value) < 65536); |
| 517 | item->leafid = leafid; |
| 518 | item->reserved = 0; |
| 519 | item->bytes = sizeof(*item) + sizeof(value); |
| 520 | *(int32_t *)(item + 1) = value; |
| 521 | trans->windex = HCC_ALIGN(trans->windex + item->bytes); |
| 522 | } |
| 523 | |
| 524 | void |
| 525 | hcc_leaf_int64(hctransaction_t trans, int16_t leafid, int64_t value) |
| 526 | { |
| 527 | struct HCLeaf *item; |
| 528 | |
| 529 | item = (void *)(trans->wbuf + trans->windex); |
| 530 | assert(trans->windex + sizeof(*item) + sizeof(value) < 65536); |
| 531 | item->leafid = leafid; |
| 532 | item->reserved = 0; |
| 533 | item->bytes = sizeof(*item) + sizeof(value); |
| 534 | *(int64_t *)(item + 1) = value; |
| 535 | trans->windex = HCC_ALIGN(trans->windex + item->bytes); |
| 536 | } |
| 537 | |
| 538 | int |
| 539 | hcc_alloc_descriptor(struct HostConf *hc, void *ptr, int type) |
| 540 | { |
| 541 | struct HCHostDesc *hd; |
| 542 | struct HCHostDesc *hnew; |
| 543 | |
| 544 | hnew = malloc(sizeof(struct HCHostDesc)); |
| 545 | hnew->type = type; |
| 546 | hnew->data = ptr; |
| 547 | |
| 548 | if ((hd = hc->hostdescs) != NULL) { |
| 549 | hnew->desc = hd->desc + 1; |
| 550 | } else { |
| 551 | hnew->desc = 1; |
| 552 | } |
| 553 | hnew->next = hd; |
| 554 | hc->hostdescs = hnew; |
| 555 | return(hnew->desc); |
| 556 | } |
| 557 | |
| 558 | void * |
| 559 | hcc_get_descriptor(struct HostConf *hc, int desc, int type) |
| 560 | { |
| 561 | struct HCHostDesc *hd; |
| 562 | |
| 563 | for (hd = hc->hostdescs; hd; hd = hd->next) { |
| 564 | if (hd->desc == desc && hd->type == type) |
| 565 | return(hd->data); |
| 566 | } |
| 567 | return(NULL); |
| 568 | } |
| 569 | |
| 570 | void |
| 571 | hcc_set_descriptor(struct HostConf *hc, int desc, void *ptr, int type) |
| 572 | { |
| 573 | struct HCHostDesc *hd; |
| 574 | struct HCHostDesc **hdp; |
| 575 | |
| 576 | for (hdp = &hc->hostdescs; (hd = *hdp) != NULL; hdp = &hd->next) { |
| 577 | if (hd->desc == desc) { |
| 578 | if (ptr) { |
| 579 | hd->data = ptr; |
| 580 | hd->type = type; |
| 581 | } else { |
| 582 | *hdp = hd->next; |
| 583 | free(hd); |
| 584 | } |
| 585 | return; |
| 586 | } |
| 587 | } |
| 588 | if (ptr) { |
| 589 | hd = malloc(sizeof(*hd)); |
| 590 | hd->desc = desc; |
| 591 | hd->type = type; |
| 592 | hd->data = ptr; |
| 593 | hd->next = hc->hostdescs; |
| 594 | hc->hostdescs = hd; |
| 595 | } |
| 596 | } |
| 597 | |
| 598 | struct HCLeaf * |
| 599 | hcc_firstitem(struct HCHead *head) |
| 600 | { |
| 601 | struct HCLeaf *item; |
| 602 | int offset; |
| 603 | |
| 604 | offset = sizeof(*head); |
| 605 | if (offset == head->bytes) |
| 606 | return(NULL); |
| 607 | assert(head->bytes >= offset + (int)sizeof(*item)); |
| 608 | item = (void *)(head + 1); |
| 609 | assert(head->bytes >= offset + item->bytes); |
| 610 | assert(item->bytes >= (int)sizeof(*item) && item->bytes < 65536 - offset); |
| 611 | return (item); |
| 612 | } |
| 613 | |
| 614 | struct HCLeaf * |
| 615 | hcc_nextitem(struct HCHead *head, struct HCLeaf *item) |
| 616 | { |
| 617 | int offset; |
| 618 | |
| 619 | item = (void *)((char *)item + HCC_ALIGN(item->bytes)); |
| 620 | offset = (char *)item - (char *)head; |
| 621 | if (offset == head->bytes) |
| 622 | return(NULL); |
| 623 | assert(head->bytes >= offset + (int)sizeof(*item)); |
| 624 | assert(head->bytes >= offset + item->bytes); |
| 625 | assert(item->bytes >= (int)sizeof(*item) && item->bytes < 65536 - offset); |
| 626 | return (item); |
| 627 | } |
| 628 | |
| 629 | #ifdef DEBUG |
| 630 | |
| 631 | void |
| 632 | hcc_debug_dump(struct HCHead *head) |
| 633 | { |
| 634 | struct HCLeaf *item; |
| 635 | int aligned_bytes = HCC_ALIGN(head->bytes); |
| 636 | |
| 637 | fprintf(stderr, "DUMP %04x (%d)", (u_int16_t)head->cmd, aligned_bytes); |
| 638 | if (head->cmd & HCF_REPLY) |
| 639 | fprintf(stderr, " error %d", head->error); |
| 640 | fprintf(stderr, "\n"); |
| 641 | for (item = hcc_firstitem(head); item; item = hcc_nextitem(head, item)) { |
| 642 | fprintf(stderr, " ITEM %04x DATA ", item->leafid); |
| 643 | switch(item->leafid & LCF_TYPEMASK) { |
| 644 | case LCF_INT32: |
| 645 | fprintf(stderr, "int32 %d\n", *(int32_t *)(item + 1)); |
| 646 | break; |
| 647 | case LCF_INT64: |
| 648 | fprintf(stderr, "int64 %lld\n", *(int64_t *)(item + 1)); |
| 649 | break; |
| 650 | case LCF_STRING: |
| 651 | fprintf(stderr, "\"%s\"\n", (char *)(item + 1)); |
| 652 | break; |
| 653 | case LCF_BINARY: |
| 654 | fprintf(stderr, "(binary)\n"); |
| 655 | break; |
| 656 | default: |
| 657 | printf("?\n"); |
| 658 | } |
| 659 | } |
| 660 | } |
| 661 | |
| 662 | #endif |