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