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 #if defined(LIBC_SCCS) && !defined(lint) 34 static char sccsid[] = "@(#)getnetconfig.c 1.12 91/12/19 SMI"; 35 #endif 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 /* 40 * Copyright (c) 1989 by Sun Microsystems, Inc. 41 */ 42 43 #include "namespace.h" 44 #include "reentrant.h" 45 #include <stdio.h> 46 #include <errno.h> 47 #include <netconfig.h> 48 #include <stddef.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <rpc/rpc.h> 52 #include <unistd.h> 53 #include "un-namespace.h" 54 #include "rpc_com.h" 55 56 /* 57 * The five library routines in this file provide application access to the 58 * system network configuration database, /etc/netconfig. In addition to the 59 * netconfig database and the routines for accessing it, the environment 60 * variable NETPATH and its corresponding routines in getnetpath.c may also be 61 * used to specify the network transport to be used. 62 */ 63 64 65 /* 66 * netconfig errors 67 */ 68 69 #define NC_NONETCONFIG ENOENT 70 #define NC_NOMEM ENOMEM 71 #define NC_NOTINIT EINVAL /* setnetconfig was not called first */ 72 #define NC_BADFILE EBADF /* format for netconfig file is bad */ 73 #define NC_NOTFOUND ENOPROTOOPT /* specified netid was not found */ 74 75 /* 76 * semantics as strings (should be in netconfig.h) 77 */ 78 #define NC_TPI_CLTS_S "tpi_clts" 79 #define NC_TPI_COTS_S "tpi_cots" 80 #define NC_TPI_COTS_ORD_S "tpi_cots_ord" 81 #define NC_TPI_RAW_S "tpi_raw" 82 83 /* 84 * flags as characters (also should be in netconfig.h) 85 */ 86 #define NC_NOFLAG_C '-' 87 #define NC_VISIBLE_C 'v' 88 #define NC_BROADCAST_C 'b' 89 90 /* 91 * Character used to indicate there is no name-to-address lookup library 92 */ 93 #define NC_NOLOOKUP "-" 94 95 static const char * const _nc_errors[] = { 96 "Netconfig database not found", 97 "Not enough memory", 98 "Not initialized", 99 "Netconfig database has invalid format", 100 "Netid not found in netconfig database" 101 }; 102 103 struct netconfig_info { 104 int eof; /* all entries has been read */ 105 int ref; /* # of times setnetconfig() has been called */ 106 struct netconfig_list *head; /* head of the list */ 107 struct netconfig_list *tail; /* last of the list */ 108 }; 109 110 struct netconfig_list { 111 char *linep; /* hold line read from netconfig */ 112 struct netconfig *ncp; 113 struct netconfig_list *next; 114 }; 115 116 struct netconfig_vars { 117 int valid; /* token that indicates a valid netconfig_vars */ 118 int flag; /* first time flag */ 119 struct netconfig_list *nc_configs; /* pointer to the current netconfig entry */ 120 }; 121 122 #define NC_VALID 0xfeed 123 #define NC_STORAGE 0xf00d 124 #define NC_INVALID 0 125 126 127 static int *__nc_error(void); 128 static int parse_ncp(char *, struct netconfig *); 129 static struct netconfig *dup_ncp(struct netconfig *); 130 131 132 static FILE *nc_file; /* for netconfig db */ 133 static mutex_t nc_file_lock = MUTEX_INITIALIZER; 134 135 static struct netconfig_info ni = { 0, 0, NULL, NULL}; 136 static mutex_t ni_lock = MUTEX_INITIALIZER; 137 138 static thread_key_t nc_key; 139 static once_t nc_once = ONCE_INITIALIZER; 140 static int nc_key_error; 141 142 static void 143 nc_key_init(void) 144 { 145 146 nc_key_error = thr_keycreate(&nc_key, free); 147 } 148 149 #define MAXNETCONFIGLINE 1000 150 151 static int * 152 __nc_error(void) 153 { 154 static int nc_error = 0; 155 int *nc_addr; 156 157 /* 158 * Use the static `nc_error' if we are the main thread 159 * (including non-threaded programs), or if an allocation 160 * fails. 161 */ 162 if (thr_main()) 163 return (&nc_error); 164 if (thr_once(&nc_once, nc_key_init) != 0 || nc_key_error != 0) 165 return (&nc_error); 166 if ((nc_addr = (int *)thr_getspecific(nc_key)) == NULL) { 167 nc_addr = (int *)malloc(sizeof (int)); 168 if (thr_setspecific(nc_key, (void *) nc_addr) != 0) { 169 free(nc_addr); 170 return (&nc_error); 171 } 172 *nc_addr = 0; 173 } 174 return (nc_addr); 175 } 176 177 #define nc_error (*(__nc_error())) 178 /* 179 * A call to setnetconfig() establishes a /etc/netconfig "session". A session 180 * "handle" is returned on a successful call. At the start of a session (after 181 * a call to setnetconfig()) searches through the /etc/netconfig database will 182 * proceed from the start of the file. The session handle must be passed to 183 * getnetconfig() to parse the file. Each call to getnetconfig() using the 184 * current handle will process one subsequent entry in /etc/netconfig. 185 * setnetconfig() must be called before the first call to getnetconfig(). 186 * (Handles are used to allow for nested calls to setnetpath()). 187 * 188 * A new session is established with each call to setnetconfig(), with a new 189 * handle being returned on each call. Previously established sessions remain 190 * active until endnetconfig() is called with that session's handle as an 191 * argument. 192 * 193 * setnetconfig() need *not* be called before a call to getnetconfigent(). 194 * setnetconfig() returns a NULL pointer on failure (for example, if 195 * the netconfig database is not present). 196 */ 197 void * 198 setnetconfig(void) 199 { 200 struct netconfig_vars *nc_vars; 201 202 if ((nc_vars = (struct netconfig_vars *)malloc(sizeof 203 (struct netconfig_vars))) == NULL) { 204 return(NULL); 205 } 206 207 /* 208 * For multiple calls, i.e. nc_file is not NULL, we just return the 209 * handle without reopening the netconfig db. 210 */ 211 mutex_lock(&ni_lock); 212 ni.ref++; 213 mutex_unlock(&ni_lock); 214 215 mutex_lock(&nc_file_lock); 216 if ((nc_file != NULL) || (nc_file = fopen(NETCONFIG, "r")) != NULL) { 217 nc_vars->valid = NC_VALID; 218 nc_vars->flag = 0; 219 nc_vars->nc_configs = ni.head; 220 mutex_unlock(&nc_file_lock); 221 return ((void *)nc_vars); 222 } 223 mutex_unlock(&nc_file_lock); 224 225 mutex_lock(&ni_lock); 226 ni.ref--; 227 mutex_unlock(&ni_lock); 228 229 nc_error = NC_NONETCONFIG; 230 free(nc_vars); 231 return (NULL); 232 } 233 234 235 /* 236 * When first called, getnetconfig() returns a pointer to the first entry in 237 * the netconfig database, formatted as a struct netconfig. On each subsequent 238 * call, getnetconfig() returns a pointer to the next entry in the database. 239 * getnetconfig() can thus be used to search the entire netconfig file. 240 * getnetconfig() returns NULL at end of file. 241 */ 242 243 struct netconfig * 244 getnetconfig(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(void *handlep) 382 { 383 struct netconfig_vars *nc_handlep = (struct netconfig_vars *)handlep; 384 385 struct netconfig_list *q, *p; 386 387 /* 388 * Verify that handle is valid 389 */ 390 if (nc_handlep == NULL || (nc_handlep->valid != NC_VALID && 391 nc_handlep->valid != NC_STORAGE)) { 392 nc_error = NC_NOTINIT; 393 return (-1); 394 } 395 396 /* 397 * Return 0 if anyone still needs it. 398 */ 399 nc_handlep->valid = NC_INVALID; 400 nc_handlep->flag = 0; 401 nc_handlep->nc_configs = NULL; 402 mutex_lock(&ni_lock); 403 if (--ni.ref > 0) { 404 mutex_unlock(&ni_lock); 405 free(nc_handlep); 406 return(0); 407 } 408 409 /* 410 * No one needs these entries anymore, then frees them. 411 * Make sure all info in netconfig_info structure has been reinitialized. 412 */ 413 q = ni.head; 414 ni.eof = ni.ref = 0; 415 ni.head = NULL; 416 ni.tail = NULL; 417 mutex_unlock(&ni_lock); 418 419 while (q != NULL) { 420 p = q->next; 421 free(q->ncp->nc_lookups); 422 free(q->ncp); 423 free(q->linep); 424 free(q); 425 q = p; 426 } 427 free(nc_handlep); 428 429 mutex_lock(&nc_file_lock); 430 fclose(nc_file); 431 nc_file = NULL; 432 mutex_unlock(&nc_file_lock); 433 434 return (0); 435 } 436 437 /* 438 * getnetconfigent(netid) returns a pointer to the struct netconfig structure 439 * corresponding to netid. It returns NULL if netid is invalid (that is, does 440 * not name an entry in the netconfig database). It returns NULL and sets 441 * errno in case of failure (for example, if the netconfig database cannot be 442 * opened). 443 */ 444 445 struct netconfig * 446 getnetconfigent(const char *netid) 447 { 448 FILE *file; /* NETCONFIG db's file pointer */ 449 char *linep; /* holds current netconfig line */ 450 char *stringp; /* temporary string pointer */ 451 struct netconfig *ncp = NULL; /* returned value */ 452 struct netconfig_list *list; /* pointer to cache list */ 453 454 nc_error = NC_NOTFOUND; /* default error. */ 455 if (netid == NULL || strlen(netid) == 0) { 456 return (NULL); 457 } 458 459 /* 460 * Look up table if the entries have already been read and parsed in 461 * getnetconfig(), then copy this entry into a buffer and return it. 462 * If we cannot find the entry in the current list and there are more 463 * entries in the netconfig db that has not been read, we then read the 464 * db and try find the match netid. 465 * If all the netconfig db has been read and placed into the list and 466 * there is no match for the netid, return NULL. 467 */ 468 mutex_lock(&ni_lock); 469 if (ni.head != NULL) { 470 for (list = ni.head; list; list = list->next) { 471 if (strcmp(list->ncp->nc_netid, netid) == 0) { 472 mutex_unlock(&ni_lock); 473 return(dup_ncp(list->ncp)); 474 } 475 } 476 if (ni.eof == 1) { /* that's all the entries */ 477 mutex_unlock(&ni_lock); 478 return(NULL); 479 } 480 } 481 mutex_unlock(&ni_lock); 482 483 484 if ((file = fopen(NETCONFIG, "r")) == NULL) { 485 nc_error = NC_NONETCONFIG; 486 return (NULL); 487 } 488 489 if ((linep = malloc(MAXNETCONFIGLINE)) == NULL) { 490 fclose(file); 491 nc_error = NC_NOMEM; 492 return (NULL); 493 } 494 do { 495 ptrdiff_t len; 496 char *tmpp; /* tmp string pointer */ 497 498 do { 499 if ((stringp = fgets(linep, MAXNETCONFIGLINE, file)) == NULL) { 500 break; 501 } 502 } while (*stringp == '#'); 503 if (stringp == NULL) { /* eof */ 504 break; 505 } 506 if ((tmpp = strpbrk(stringp, "\t ")) == NULL) { /* can't parse file */ 507 nc_error = NC_BADFILE; 508 break; 509 } 510 if (strlen(netid) == (size_t) (len = tmpp - stringp) && /* a match */ 511 strncmp(stringp, netid, (size_t)len) == 0) { 512 if ((ncp = (struct netconfig *) 513 malloc(sizeof (struct netconfig))) == NULL) { 514 break; 515 } 516 ncp->nc_lookups = NULL; 517 if (parse_ncp(linep, ncp) == -1) { 518 free(ncp); 519 ncp = NULL; 520 } 521 break; 522 } 523 } while (stringp != NULL); 524 if (ncp == NULL) { 525 free(linep); 526 } 527 fclose(file); 528 return(ncp); 529 } 530 531 /* 532 * freenetconfigent(netconfigp) frees the netconfig structure pointed to by 533 * netconfigp (previously returned by getnetconfigent()). 534 */ 535 536 void 537 freenetconfigent(struct netconfig *netconfigp) 538 { 539 if (netconfigp != NULL) { 540 free(netconfigp->nc_netid); /* holds all netconfigp's strings */ 541 free(netconfigp->nc_lookups); 542 free(netconfigp); 543 } 544 return; 545 } 546 547 /* 548 * Parse line and stuff it in a struct netconfig 549 * Typical line might look like: 550 * udp tpi_cots vb inet udp /dev/udp /usr/lib/ip.so,/usr/local/ip.so 551 * 552 * We return -1 if any of the tokens don't parse, or malloc fails. 553 * 554 * Note that we modify stringp (putting NULLs after tokens) and 555 * we set the ncp's string field pointers to point to these tokens within 556 * stringp. 557 * 558 * stringp - string to parse 559 * ncp - where to put results 560 */ 561 562 static int 563 parse_ncp(char *stringp, struct netconfig *ncp) 564 { 565 char *tokenp; /* for processing tokens */ 566 char *lasts; 567 char **nc_lookups; 568 569 nc_error = NC_BADFILE; /* nearly anything that breaks is for this reason */ 570 stringp[strlen(stringp)-1] = '\0'; /* get rid of newline */ 571 /* netid */ 572 if ((ncp->nc_netid = strtok_r(stringp, "\t ", &lasts)) == NULL) { 573 return (-1); 574 } 575 576 /* semantics */ 577 if ((tokenp = strtok_r(NULL, "\t ", &lasts)) == NULL) { 578 return (-1); 579 } 580 if (strcmp(tokenp, NC_TPI_COTS_ORD_S) == 0) 581 ncp->nc_semantics = NC_TPI_COTS_ORD; 582 else if (strcmp(tokenp, NC_TPI_COTS_S) == 0) 583 ncp->nc_semantics = NC_TPI_COTS; 584 else if (strcmp(tokenp, NC_TPI_CLTS_S) == 0) 585 ncp->nc_semantics = NC_TPI_CLTS; 586 else if (strcmp(tokenp, NC_TPI_RAW_S) == 0) 587 ncp->nc_semantics = NC_TPI_RAW; 588 else 589 return (-1); 590 591 /* flags */ 592 if ((tokenp = strtok_r(NULL, "\t ", &lasts)) == NULL) { 593 return (-1); 594 } 595 for (ncp->nc_flag = NC_NOFLAG; *tokenp != '\0'; 596 tokenp++) { 597 switch (*tokenp) { 598 case NC_NOFLAG_C: 599 break; 600 case NC_VISIBLE_C: 601 ncp->nc_flag |= NC_VISIBLE; 602 break; 603 case NC_BROADCAST_C: 604 ncp->nc_flag |= NC_BROADCAST; 605 break; 606 default: 607 return (-1); 608 } 609 } 610 /* protocol family */ 611 if ((ncp->nc_protofmly = strtok_r(NULL, "\t ", &lasts)) == NULL) { 612 return (-1); 613 } 614 /* protocol name */ 615 if ((ncp->nc_proto = strtok_r(NULL, "\t ", &lasts)) == NULL) { 616 return (-1); 617 } 618 /* network device */ 619 if ((ncp->nc_device = strtok_r(NULL, "\t ", &lasts)) == NULL) { 620 return (-1); 621 } 622 if ((tokenp = strtok_r(NULL, "\t ", &lasts)) == NULL) { 623 return (-1); 624 } 625 if (strcmp(tokenp, NC_NOLOOKUP) == 0) { 626 ncp->nc_nlookups = 0; 627 ncp->nc_lookups = NULL; 628 } else { 629 char *cp; /* tmp string */ 630 631 free(ncp->nc_lookups); /* from last visit */ 632 ncp->nc_lookups = NULL; 633 ncp->nc_nlookups = 0; 634 while ((cp = tokenp) != NULL) { 635 if ((nc_lookups = reallocarray(ncp->nc_lookups, 636 ncp->nc_nlookups + 1, sizeof(*ncp->nc_lookups))) == NULL) { 637 free(ncp->nc_lookups); 638 ncp->nc_lookups = NULL; 639 return (-1); 640 } 641 tokenp = _get_next_token(cp, ','); 642 ncp->nc_lookups = nc_lookups; 643 ncp->nc_lookups[ncp->nc_nlookups++] = cp; 644 } 645 } 646 return (0); 647 } 648 649 650 /* 651 * Returns a string describing the reason for failure. 652 */ 653 char * 654 nc_sperror(void) 655 { 656 const char *message; 657 658 switch(nc_error) { 659 case NC_NONETCONFIG: 660 message = _nc_errors[0]; 661 break; 662 case NC_NOMEM: 663 message = _nc_errors[1]; 664 break; 665 case NC_NOTINIT: 666 message = _nc_errors[2]; 667 break; 668 case NC_BADFILE: 669 message = _nc_errors[3]; 670 break; 671 case NC_NOTFOUND: 672 message = _nc_errors[4]; 673 break; 674 default: 675 message = "Unknown network selection error"; 676 } 677 /* LINTED const castaway */ 678 return ((char *)message); 679 } 680 681 /* 682 * Prints a message onto standard error describing the reason for failure. 683 */ 684 void 685 nc_perror(const char *s) 686 { 687 fprintf(stderr, "%s: %s\n", s, nc_sperror()); 688 } 689 690 /* 691 * Duplicates the matched netconfig buffer. 692 */ 693 static struct netconfig * 694 dup_ncp(struct netconfig *ncp) 695 { 696 struct netconfig *p; 697 char *tmp; 698 u_int i; 699 700 if ((tmp=malloc(MAXNETCONFIGLINE)) == NULL) 701 return(NULL); 702 if ((p=(struct netconfig *)malloc(sizeof(struct netconfig))) == NULL) { 703 free(tmp); 704 return(NULL); 705 } 706 /* 707 * First we dup all the data from matched netconfig buffer. Then we 708 * adjust some of the member pointer to a pre-allocated buffer where 709 * contains part of the data. 710 * To follow the convention used in parse_ncp(), we store all the 711 * necessary information in the pre-allocated buffer and let each 712 * of the netconfig char pointer member point to the right address 713 * in the buffer. 714 */ 715 *p = *ncp; 716 p->nc_netid = (char *)strcpy(tmp,ncp->nc_netid); 717 tmp = strchr(tmp, '\0') + 1; 718 p->nc_protofmly = (char *)strcpy(tmp,ncp->nc_protofmly); 719 tmp = strchr(tmp, '\0') + 1; 720 p->nc_proto = (char *)strcpy(tmp,ncp->nc_proto); 721 tmp = strchr(tmp, '\0') + 1; 722 p->nc_device = (char *)strcpy(tmp,ncp->nc_device); 723 p->nc_lookups = (char **)malloc((size_t)(p->nc_nlookups+1) * sizeof(char *)); 724 if (p->nc_lookups == NULL) { 725 free(p->nc_netid); 726 free(p); 727 return(NULL); 728 } 729 for (i=0; i < p->nc_nlookups; i++) { 730 tmp = strchr(tmp, '\0') + 1; 731 p->nc_lookups[i] = (char *)strcpy(tmp,ncp->nc_lookups[i]); 732 } 733 return(p); 734 } 735