1 /* $NetBSD: getnetconfig.c,v 1.3 2000/07/06 03:10:34 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2009, Sun Microsystems, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions are met: 9 * - Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * - Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * - Neither the name of Sun Microsystems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #if defined(LIBC_SCCS) && !defined(lint) 32 static char sccsid[] = "@(#)getnetconfig.c 1.12 91/12/19 SMI"; 33 #endif 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 /* 38 * Copyright (c) 1989 by Sun Microsystems, Inc. 39 */ 40 41 #include "namespace.h" 42 #include "reentrant.h" 43 #include <stdio.h> 44 #include <errno.h> 45 #include <netconfig.h> 46 #include <stddef.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <rpc/rpc.h> 50 #include <unistd.h> 51 #include "un-namespace.h" 52 #include "rpc_com.h" 53 54 /* 55 * The five library routines in this file provide application access to the 56 * system network configuration database, /etc/netconfig. In addition to the 57 * netconfig database and the routines for accessing it, the environment 58 * variable NETPATH and its corresponding routines in getnetpath.c may also be 59 * used to specify the network transport to be used. 60 */ 61 62 63 /* 64 * netconfig errors 65 */ 66 67 #define NC_NONETCONFIG ENOENT 68 #define NC_NOMEM ENOMEM 69 #define NC_NOTINIT EINVAL /* setnetconfig was not called first */ 70 #define NC_BADFILE EBADF /* format for netconfig file is bad */ 71 #define NC_NOTFOUND ENOPROTOOPT /* specified netid was not found */ 72 73 /* 74 * semantics as strings (should be in netconfig.h) 75 */ 76 #define NC_TPI_CLTS_S "tpi_clts" 77 #define NC_TPI_COTS_S "tpi_cots" 78 #define NC_TPI_COTS_ORD_S "tpi_cots_ord" 79 #define NC_TPI_RAW_S "tpi_raw" 80 81 /* 82 * flags as characters (also should be in netconfig.h) 83 */ 84 #define NC_NOFLAG_C '-' 85 #define NC_VISIBLE_C 'v' 86 #define NC_BROADCAST_C 'b' 87 88 /* 89 * Character used to indicate there is no name-to-address lookup library 90 */ 91 #define NC_NOLOOKUP "-" 92 93 static const char * const _nc_errors[] = { 94 "Netconfig database not found", 95 "Not enough memory", 96 "Not initialized", 97 "Netconfig database has invalid format", 98 "Netid not found in netconfig database" 99 }; 100 101 struct netconfig_info { 102 int eof; /* all entries has been read */ 103 int ref; /* # of times setnetconfig() has been called */ 104 struct netconfig_list *head; /* head of the list */ 105 struct netconfig_list *tail; /* last of the list */ 106 }; 107 108 struct netconfig_list { 109 char *linep; /* hold line read from netconfig */ 110 struct netconfig *ncp; 111 struct netconfig_list *next; 112 }; 113 114 struct netconfig_vars { 115 int valid; /* token that indicates a valid netconfig_vars */ 116 int flag; /* first time flag */ 117 struct netconfig_list *nc_configs; /* pointer to the current netconfig entry */ 118 }; 119 120 #define NC_VALID 0xfeed 121 #define NC_STORAGE 0xf00d 122 #define NC_INVALID 0 123 124 125 static int *__nc_error(void); 126 static int parse_ncp(char *, struct netconfig *); 127 static struct netconfig *dup_ncp(struct netconfig *); 128 129 130 static FILE *nc_file; /* for netconfig db */ 131 static mutex_t nc_file_lock = MUTEX_INITIALIZER; 132 133 static struct netconfig_info ni = { 0, 0, NULL, NULL}; 134 static mutex_t ni_lock = MUTEX_INITIALIZER; 135 136 static thread_key_t nc_key; 137 static once_t nc_once = ONCE_INITIALIZER; 138 static int nc_key_error; 139 140 static void 141 nc_key_init(void) 142 { 143 144 nc_key_error = thr_keycreate(&nc_key, free); 145 } 146 147 #define MAXNETCONFIGLINE 1000 148 149 static int * 150 __nc_error() 151 { 152 static int nc_error = 0; 153 int *nc_addr; 154 155 /* 156 * Use the static `nc_error' if we are the main thread 157 * (including non-threaded programs), or if an allocation 158 * fails. 159 */ 160 if (thr_main()) 161 return (&nc_error); 162 if (thr_once(&nc_once, nc_key_init) != 0 || nc_key_error != 0) 163 return (&nc_error); 164 if ((nc_addr = (int *)thr_getspecific(nc_key)) == NULL) { 165 nc_addr = (int *)malloc(sizeof (int)); 166 if (thr_setspecific(nc_key, (void *) nc_addr) != 0) { 167 if (nc_addr) 168 free(nc_addr); 169 return (&nc_error); 170 } 171 *nc_addr = 0; 172 } 173 return (nc_addr); 174 } 175 176 #define nc_error (*(__nc_error())) 177 /* 178 * A call to setnetconfig() establishes a /etc/netconfig "session". A session 179 * "handle" is returned on a successful call. At the start of a session (after 180 * a call to setnetconfig()) searches through the /etc/netconfig database will 181 * proceed from the start of the file. The session handle must be passed to 182 * getnetconfig() to parse the file. Each call to getnetconfig() using the 183 * current handle will process one subsequent entry in /etc/netconfig. 184 * setnetconfig() must be called before the first call to getnetconfig(). 185 * (Handles are used to allow for nested calls to setnetpath()). 186 * 187 * A new session is established with each call to setnetconfig(), with a new 188 * handle being returned on each call. Previously established sessions remain 189 * active until endnetconfig() is called with that session's handle as an 190 * argument. 191 * 192 * setnetconfig() need *not* be called before a call to getnetconfigent(). 193 * setnetconfig() returns a NULL pointer on failure (for example, if 194 * the netconfig database is not present). 195 */ 196 void * 197 setnetconfig() 198 { 199 struct netconfig_vars *nc_vars; 200 201 if ((nc_vars = (struct netconfig_vars *)malloc(sizeof 202 (struct netconfig_vars))) == NULL) { 203 return(NULL); 204 } 205 206 /* 207 * For multiple calls, i.e. nc_file is not NULL, we just return the 208 * handle without reopening the netconfig db. 209 */ 210 mutex_lock(&ni_lock); 211 ni.ref++; 212 mutex_unlock(&ni_lock); 213 214 mutex_lock(&nc_file_lock); 215 if ((nc_file != NULL) || (nc_file = fopen(NETCONFIG, "r")) != NULL) { 216 nc_vars->valid = NC_VALID; 217 nc_vars->flag = 0; 218 nc_vars->nc_configs = ni.head; 219 mutex_unlock(&nc_file_lock); 220 return ((void *)nc_vars); 221 } 222 mutex_unlock(&nc_file_lock); 223 224 mutex_lock(&ni_lock); 225 ni.ref--; 226 mutex_unlock(&ni_lock); 227 228 nc_error = NC_NONETCONFIG; 229 free(nc_vars); 230 return (NULL); 231 } 232 233 234 /* 235 * When first called, getnetconfig() returns a pointer to the first entry in 236 * the netconfig database, formatted as a struct netconfig. On each subsequent 237 * call, getnetconfig() returns a pointer to the next entry in the database. 238 * getnetconfig() can thus be used to search the entire netconfig file. 239 * getnetconfig() returns NULL at end of file. 240 */ 241 242 struct netconfig * 243 getnetconfig(handlep) 244 void *handlep; 245 { 246 struct netconfig_vars *ncp = (struct netconfig_vars *)handlep; 247 char *stringp; /* tmp string pointer */ 248 struct netconfig_list *list; 249 struct netconfig *np; 250 struct netconfig *result; 251 252 /* 253 * Verify that handle is valid 254 */ 255 mutex_lock(&nc_file_lock); 256 if (ncp == NULL || nc_file == NULL) { 257 nc_error = NC_NOTINIT; 258 mutex_unlock(&nc_file_lock); 259 return (NULL); 260 } 261 mutex_unlock(&nc_file_lock); 262 263 switch (ncp->valid) { 264 case NC_VALID: 265 /* 266 * If entry has already been read into the list, 267 * we return the entry in the linked list. 268 * If this is the first time call, check if there are any entries in 269 * linked list. If no entries, we need to read the netconfig db. 270 * If we have been here and the next entry is there, we just return 271 * it. 272 */ 273 if (ncp->flag == 0) { /* first time */ 274 ncp->flag = 1; 275 mutex_lock(&ni_lock); 276 ncp->nc_configs = ni.head; 277 mutex_unlock(&ni_lock); 278 if (ncp->nc_configs != NULL) /* entry already exist */ 279 return(ncp->nc_configs->ncp); 280 } 281 else if (ncp->nc_configs != NULL && ncp->nc_configs->next != NULL) { 282 ncp->nc_configs = ncp->nc_configs->next; 283 return(ncp->nc_configs->ncp); 284 } 285 286 /* 287 * If we cannot find the entry in the list and is end of file, 288 * we give up. 289 */ 290 mutex_lock(&ni_lock); 291 if (ni.eof == 1) { 292 mutex_unlock(&ni_lock); 293 return(NULL); 294 } 295 mutex_unlock(&ni_lock); 296 297 break; 298 default: 299 nc_error = NC_NOTINIT; 300 return (NULL); 301 } 302 303 stringp = (char *) malloc(MAXNETCONFIGLINE); 304 if (stringp == NULL) 305 return (NULL); 306 307 #ifdef MEM_CHK 308 if (malloc_verify() == 0) { 309 fprintf(stderr, "memory heap corrupted in getnetconfig\n"); 310 exit(1); 311 } 312 #endif 313 314 /* 315 * Read a line from netconfig file. 316 */ 317 mutex_lock(&nc_file_lock); 318 do { 319 if (fgets(stringp, MAXNETCONFIGLINE, nc_file) == NULL) { 320 free(stringp); 321 mutex_lock(&ni_lock); 322 ni.eof = 1; 323 mutex_unlock(&ni_lock); 324 mutex_unlock(&nc_file_lock); 325 return (NULL); 326 } 327 } while (*stringp == '#'); 328 mutex_unlock(&nc_file_lock); 329 330 list = (struct netconfig_list *) malloc(sizeof (struct netconfig_list)); 331 if (list == NULL) { 332 free(stringp); 333 return(NULL); 334 } 335 np = (struct netconfig *) malloc(sizeof (struct netconfig)); 336 if (np == NULL) { 337 free(stringp); 338 free(list); 339 return(NULL); 340 } 341 list->ncp = np; 342 list->next = NULL; 343 list->ncp->nc_lookups = NULL; 344 list->linep = stringp; 345 if (parse_ncp(stringp, list->ncp) == -1) { 346 free(stringp); 347 free(np); 348 free(list); 349 return (NULL); 350 } 351 else { 352 /* 353 * If this is the first entry that's been read, it is the head of 354 * the list. If not, put the entry at the end of the list. 355 * Reposition the current pointer of the handle to the last entry 356 * in the list. 357 */ 358 mutex_lock(&ni_lock); 359 if (ni.head == NULL) { /* first entry */ 360 ni.head = ni.tail = list; 361 } 362 else { 363 ni.tail->next = list; 364 ni.tail = ni.tail->next; 365 } 366 ncp->nc_configs = ni.tail; 367 result = ni.tail->ncp; 368 mutex_unlock(&ni_lock); 369 return(result); 370 } 371 } 372 373 /* 374 * endnetconfig() may be called to "unbind" or "close" the netconfig database 375 * when processing is complete, releasing resources for reuse. endnetconfig() 376 * may not be called before setnetconfig(). endnetconfig() returns 0 on 377 * success and -1 on failure (for example, if setnetconfig() was not called 378 * previously). 379 */ 380 int 381 endnetconfig(handlep) 382 void *handlep; 383 { 384 struct netconfig_vars *nc_handlep = (struct netconfig_vars *)handlep; 385 386 struct netconfig_list *q, *p; 387 388 /* 389 * Verify that handle is valid 390 */ 391 if (nc_handlep == NULL || (nc_handlep->valid != NC_VALID && 392 nc_handlep->valid != NC_STORAGE)) { 393 nc_error = NC_NOTINIT; 394 return (-1); 395 } 396 397 /* 398 * Return 0 if anyone still needs it. 399 */ 400 nc_handlep->valid = NC_INVALID; 401 nc_handlep->flag = 0; 402 nc_handlep->nc_configs = NULL; 403 mutex_lock(&ni_lock); 404 if (--ni.ref > 0) { 405 mutex_unlock(&ni_lock); 406 free(nc_handlep); 407 return(0); 408 } 409 410 /* 411 * Noone needs these entries anymore, then frees them. 412 * Make sure all info in netconfig_info structure has been reinitialized. 413 */ 414 q = ni.head; 415 ni.eof = ni.ref = 0; 416 ni.head = NULL; 417 ni.tail = NULL; 418 mutex_unlock(&ni_lock); 419 420 while (q != NULL) { 421 p = q->next; 422 if (q->ncp->nc_lookups != NULL) free(q->ncp->nc_lookups); 423 free(q->ncp); 424 free(q->linep); 425 free(q); 426 q = p; 427 } 428 free(nc_handlep); 429 430 mutex_lock(&nc_file_lock); 431 fclose(nc_file); 432 nc_file = NULL; 433 mutex_unlock(&nc_file_lock); 434 435 return (0); 436 } 437 438 /* 439 * getnetconfigent(netid) returns a pointer to the struct netconfig structure 440 * corresponding to netid. It returns NULL if netid is invalid (that is, does 441 * not name an entry in the netconfig database). It returns NULL and sets 442 * errno in case of failure (for example, if the netconfig database cannot be 443 * opened). 444 */ 445 446 struct netconfig * 447 getnetconfigent(netid) 448 const char *netid; 449 { 450 FILE *file; /* NETCONFIG db's file pointer */ 451 char *linep; /* holds current netconfig line */ 452 char *stringp; /* temporary string pointer */ 453 struct netconfig *ncp = NULL; /* returned value */ 454 struct netconfig_list *list; /* pointer to cache list */ 455 456 nc_error = NC_NOTFOUND; /* default error. */ 457 if (netid == NULL || strlen(netid) == 0) { 458 return (NULL); 459 } 460 461 /* 462 * Look up table if the entries have already been read and parsed in 463 * getnetconfig(), then copy this entry into a buffer and return it. 464 * If we cannot find the entry in the current list and there are more 465 * entries in the netconfig db that has not been read, we then read the 466 * db and try find the match netid. 467 * If all the netconfig db has been read and placed into the list and 468 * there is no match for the netid, return NULL. 469 */ 470 mutex_lock(&ni_lock); 471 if (ni.head != NULL) { 472 for (list = ni.head; list; list = list->next) { 473 if (strcmp(list->ncp->nc_netid, netid) == 0) { 474 mutex_unlock(&ni_lock); 475 return(dup_ncp(list->ncp)); 476 } 477 } 478 if (ni.eof == 1) { /* that's all the entries */ 479 mutex_unlock(&ni_lock); 480 return(NULL); 481 } 482 } 483 mutex_unlock(&ni_lock); 484 485 486 if ((file = fopen(NETCONFIG, "r")) == NULL) { 487 nc_error = NC_NONETCONFIG; 488 return (NULL); 489 } 490 491 if ((linep = malloc(MAXNETCONFIGLINE)) == NULL) { 492 fclose(file); 493 nc_error = NC_NOMEM; 494 return (NULL); 495 } 496 do { 497 ptrdiff_t len; 498 char *tmpp; /* tmp string pointer */ 499 500 do { 501 if ((stringp = fgets(linep, MAXNETCONFIGLINE, file)) == NULL) { 502 break; 503 } 504 } while (*stringp == '#'); 505 if (stringp == NULL) { /* eof */ 506 break; 507 } 508 if ((tmpp = strpbrk(stringp, "\t ")) == NULL) { /* can't parse file */ 509 nc_error = NC_BADFILE; 510 break; 511 } 512 if (strlen(netid) == (size_t) (len = tmpp - stringp) && /* a match */ 513 strncmp(stringp, netid, (size_t)len) == 0) { 514 if ((ncp = (struct netconfig *) 515 malloc(sizeof (struct netconfig))) == NULL) { 516 break; 517 } 518 ncp->nc_lookups = NULL; 519 if (parse_ncp(linep, ncp) == -1) { 520 free(ncp); 521 ncp = NULL; 522 } 523 break; 524 } 525 } while (stringp != NULL); 526 if (ncp == NULL) { 527 free(linep); 528 } 529 fclose(file); 530 return(ncp); 531 } 532 533 /* 534 * freenetconfigent(netconfigp) frees the netconfig structure pointed to by 535 * netconfigp (previously returned by getnetconfigent()). 536 */ 537 538 void 539 freenetconfigent(netconfigp) 540 struct netconfig *netconfigp; 541 { 542 if (netconfigp != NULL) { 543 free(netconfigp->nc_netid); /* holds all netconfigp's strings */ 544 if (netconfigp->nc_lookups != NULL) 545 free(netconfigp->nc_lookups); 546 free(netconfigp); 547 } 548 return; 549 } 550 551 /* 552 * Parse line and stuff it in a struct netconfig 553 * Typical line might look like: 554 * udp tpi_cots vb inet udp /dev/udp /usr/lib/ip.so,/usr/local/ip.so 555 * 556 * We return -1 if any of the tokens don't parse, or malloc fails. 557 * 558 * Note that we modify stringp (putting NULLs after tokens) and 559 * we set the ncp's string field pointers to point to these tokens within 560 * stringp. 561 */ 562 563 static int 564 parse_ncp(stringp, ncp) 565 char *stringp; /* string to parse */ 566 struct netconfig *ncp; /* where to put results */ 567 { 568 char *tokenp; /* for processing tokens */ 569 char *lasts; 570 char **nc_lookups; 571 572 nc_error = NC_BADFILE; /* nearly anything that breaks is for this reason */ 573 stringp[strlen(stringp)-1] = '\0'; /* get rid of newline */ 574 /* netid */ 575 if ((ncp->nc_netid = strtok_r(stringp, "\t ", &lasts)) == NULL) { 576 return (-1); 577 } 578 579 /* semantics */ 580 if ((tokenp = strtok_r(NULL, "\t ", &lasts)) == NULL) { 581 return (-1); 582 } 583 if (strcmp(tokenp, NC_TPI_COTS_ORD_S) == 0) 584 ncp->nc_semantics = NC_TPI_COTS_ORD; 585 else if (strcmp(tokenp, NC_TPI_COTS_S) == 0) 586 ncp->nc_semantics = NC_TPI_COTS; 587 else if (strcmp(tokenp, NC_TPI_CLTS_S) == 0) 588 ncp->nc_semantics = NC_TPI_CLTS; 589 else if (strcmp(tokenp, NC_TPI_RAW_S) == 0) 590 ncp->nc_semantics = NC_TPI_RAW; 591 else 592 return (-1); 593 594 /* flags */ 595 if ((tokenp = strtok_r(NULL, "\t ", &lasts)) == NULL) { 596 return (-1); 597 } 598 for (ncp->nc_flag = NC_NOFLAG; *tokenp != '\0'; 599 tokenp++) { 600 switch (*tokenp) { 601 case NC_NOFLAG_C: 602 break; 603 case NC_VISIBLE_C: 604 ncp->nc_flag |= NC_VISIBLE; 605 break; 606 case NC_BROADCAST_C: 607 ncp->nc_flag |= NC_BROADCAST; 608 break; 609 default: 610 return (-1); 611 } 612 } 613 /* protocol family */ 614 if ((ncp->nc_protofmly = strtok_r(NULL, "\t ", &lasts)) == NULL) { 615 return (-1); 616 } 617 /* protocol name */ 618 if ((ncp->nc_proto = strtok_r(NULL, "\t ", &lasts)) == NULL) { 619 return (-1); 620 } 621 /* network device */ 622 if ((ncp->nc_device = strtok_r(NULL, "\t ", &lasts)) == NULL) { 623 return (-1); 624 } 625 if ((tokenp = strtok_r(NULL, "\t ", &lasts)) == NULL) { 626 return (-1); 627 } 628 if (strcmp(tokenp, NC_NOLOOKUP) == 0) { 629 ncp->nc_nlookups = 0; 630 ncp->nc_lookups = NULL; 631 } else { 632 char *cp; /* tmp string */ 633 634 if (ncp->nc_lookups != NULL) /* from last visit */ 635 free(ncp->nc_lookups); 636 ncp->nc_lookups = NULL; 637 ncp->nc_nlookups = 0; 638 while ((cp = tokenp) != NULL) { 639 if ((nc_lookups = realloc(ncp->nc_lookups, 640 (ncp->nc_nlookups + 1) * sizeof *ncp->nc_lookups)) == NULL) { 641 free(ncp->nc_lookups); 642 ncp->nc_lookups = NULL; 643 return (-1); 644 } 645 tokenp = _get_next_token(cp, ','); 646 ncp->nc_lookups = nc_lookups; 647 ncp->nc_lookups[ncp->nc_nlookups++] = cp; 648 } 649 } 650 return (0); 651 } 652 653 654 /* 655 * Returns a string describing the reason for failure. 656 */ 657 char * 658 nc_sperror() 659 { 660 const char *message; 661 662 switch(nc_error) { 663 case NC_NONETCONFIG: 664 message = _nc_errors[0]; 665 break; 666 case NC_NOMEM: 667 message = _nc_errors[1]; 668 break; 669 case NC_NOTINIT: 670 message = _nc_errors[2]; 671 break; 672 case NC_BADFILE: 673 message = _nc_errors[3]; 674 break; 675 case NC_NOTFOUND: 676 message = _nc_errors[4]; 677 break; 678 default: 679 message = "Unknown network selection error"; 680 } 681 /* LINTED const castaway */ 682 return ((char *)message); 683 } 684 685 /* 686 * Prints a message onto standard error describing the reason for failure. 687 */ 688 void 689 nc_perror(s) 690 const char *s; 691 { 692 fprintf(stderr, "%s: %s\n", s, nc_sperror()); 693 } 694 695 /* 696 * Duplicates the matched netconfig buffer. 697 */ 698 static struct netconfig * 699 dup_ncp(ncp) 700 struct netconfig *ncp; 701 { 702 struct netconfig *p; 703 char *tmp; 704 u_int i; 705 706 if ((tmp=malloc(MAXNETCONFIGLINE)) == NULL) 707 return(NULL); 708 if ((p=(struct netconfig *)malloc(sizeof(struct netconfig))) == NULL) { 709 free(tmp); 710 return(NULL); 711 } 712 /* 713 * First we dup all the data from matched netconfig buffer. Then we 714 * adjust some of the member pointer to a pre-allocated buffer where 715 * contains part of the data. 716 * To follow the convention used in parse_ncp(), we store all the 717 * necessary information in the pre-allocated buffer and let each 718 * of the netconfig char pointer member point to the right address 719 * in the buffer. 720 */ 721 *p = *ncp; 722 p->nc_netid = (char *)strcpy(tmp,ncp->nc_netid); 723 tmp = strchr(tmp, '\0') + 1; 724 p->nc_protofmly = (char *)strcpy(tmp,ncp->nc_protofmly); 725 tmp = strchr(tmp, '\0') + 1; 726 p->nc_proto = (char *)strcpy(tmp,ncp->nc_proto); 727 tmp = strchr(tmp, '\0') + 1; 728 p->nc_device = (char *)strcpy(tmp,ncp->nc_device); 729 p->nc_lookups = (char **)malloc((size_t)(p->nc_nlookups+1) * sizeof(char *)); 730 if (p->nc_lookups == NULL) { 731 free(p->nc_netid); 732 free(p); 733 return(NULL); 734 } 735 for (i=0; i < p->nc_nlookups; i++) { 736 tmp = strchr(tmp, '\0') + 1; 737 p->nc_lookups[i] = (char *)strcpy(tmp,ncp->nc_lookups[i]); 738 } 739 return(p); 740 } 741