1 /* $NetBSD: getnetconfig.c,v 1.3 2000/07/06 03:10:34 christos Exp $ */ 2 3 /* 4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 5 * unrestricted use provided that this legend is included on all tape 6 * media and as a part of the software program in whole or part. Users 7 * may copy or modify Sun RPC without charge, but are not authorized 8 * to license or distribute it to anyone else except as part of a product or 9 * program developed by the user or with the express written consent of 10 * Sun Microsystems, Inc. 11 * 12 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 13 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 14 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 15 * 16 * Sun RPC is provided with no support and without any obligation on the 17 * part of Sun Microsystems, Inc. to assist in its use, correction, 18 * modification or enhancement. 19 * 20 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 21 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 22 * OR ANY PART THEREOF. 23 * 24 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 25 * or profits or other special, indirect and consequential damages, even if 26 * Sun has been advised of the possibility of such damages. 27 * 28 * Sun Microsystems, Inc. 29 * 2550 Garcia Avenue 30 * Mountain View, California 94043 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 pthread_mutex_t nc_file_lock = PTHREAD_MUTEX_INITIALIZER; 134 135 static struct netconfig_info ni = { 0, 0, NULL, NULL}; 136 static pthread_mutex_t ni_lock = PTHREAD_MUTEX_INITIALIZER; 137 138 139 #define MAXNETCONFIGLINE 1000 140 141 static int * 142 __nc_error() 143 { 144 static pthread_mutex_t nc_lock = PTHREAD_MUTEX_INITIALIZER; 145 static thread_key_t nc_key = 0; 146 static int nc_error = 0; 147 int error, *nc_addr; 148 149 /* 150 * Use the static `nc_error' if we are the main thread 151 * (including non-threaded programs), or if an allocation 152 * fails. 153 */ 154 if (thr_main()) 155 return (&nc_error); 156 if (nc_key == 0) { 157 error = 0; 158 mutex_lock(&nc_lock); 159 if (nc_key == 0) 160 error = thr_keycreate(&nc_key, free); 161 mutex_unlock(&nc_lock); 162 if (error) 163 return (&nc_error); 164 } 165 if ((nc_addr = (int *)thr_getspecific(nc_key)) == NULL) { 166 nc_addr = (int *)malloc(sizeof (int)); 167 if (thr_setspecific(nc_key, (void *) nc_addr) != 0) { 168 if (nc_addr) 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() 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(handlep) 245 void *handlep; 246 { 247 struct netconfig_vars *ncp = (struct netconfig_vars *)handlep; 248 char *stringp; /* tmp string pointer */ 249 struct netconfig_list *list; 250 struct netconfig *np; 251 struct netconfig *result; 252 253 /* 254 * Verify that handle is valid 255 */ 256 mutex_lock(&nc_file_lock); 257 if (ncp == NULL || nc_file == NULL) { 258 nc_error = NC_NOTINIT; 259 mutex_unlock(&nc_file_lock); 260 return (NULL); 261 } 262 mutex_unlock(&nc_file_lock); 263 264 switch (ncp->valid) { 265 case NC_VALID: 266 /* 267 * If entry has already been read into the list, 268 * we return the entry in the linked list. 269 * If this is the first time call, check if there are any entries in 270 * linked list. If no entries, we need to read the netconfig db. 271 * If we have been here and the next entry is there, we just return 272 * it. 273 */ 274 if (ncp->flag == 0) { /* first time */ 275 ncp->flag = 1; 276 mutex_lock(&ni_lock); 277 ncp->nc_configs = ni.head; 278 mutex_unlock(&ni_lock); 279 if (ncp->nc_configs != NULL) /* entry already exist */ 280 return(ncp->nc_configs->ncp); 281 } 282 else if (ncp->nc_configs != NULL && ncp->nc_configs->next != NULL) { 283 ncp->nc_configs = ncp->nc_configs->next; 284 return(ncp->nc_configs->ncp); 285 } 286 287 /* 288 * If we cannot find the entry in the list and is end of file, 289 * we give up. 290 */ 291 mutex_lock(&ni_lock); 292 if (ni.eof == 1) { 293 mutex_unlock(&ni_lock); 294 return(NULL); 295 } 296 mutex_unlock(&ni_lock); 297 298 break; 299 default: 300 nc_error = NC_NOTINIT; 301 return (NULL); 302 } 303 304 stringp = (char *) malloc(MAXNETCONFIGLINE); 305 if (stringp == NULL) 306 return (NULL); 307 308 #ifdef MEM_CHK 309 if (malloc_verify() == 0) { 310 fprintf(stderr, "memory heap corrupted in getnetconfig\n"); 311 exit(1); 312 } 313 #endif 314 315 /* 316 * Read a line from netconfig file. 317 */ 318 mutex_lock(&nc_file_lock); 319 do { 320 if (fgets(stringp, MAXNETCONFIGLINE, nc_file) == NULL) { 321 free(stringp); 322 mutex_lock(&ni_lock); 323 ni.eof = 1; 324 mutex_unlock(&ni_lock); 325 mutex_unlock(&nc_file_lock); 326 return (NULL); 327 } 328 } while (*stringp == '#'); 329 mutex_unlock(&nc_file_lock); 330 331 list = (struct netconfig_list *) malloc(sizeof (struct netconfig_list)); 332 if (list == NULL) { 333 free(stringp); 334 return(NULL); 335 } 336 np = (struct netconfig *) malloc(sizeof (struct netconfig)); 337 if (np == NULL) { 338 free(stringp); 339 free(list); 340 return(NULL); 341 } 342 list->ncp = np; 343 list->next = NULL; 344 list->ncp->nc_lookups = NULL; 345 list->linep = stringp; 346 if (parse_ncp(stringp, list->ncp) == -1) { 347 free(stringp); 348 free(np); 349 free(list); 350 return (NULL); 351 } 352 else { 353 /* 354 * If this is the first entry that's been read, it is the head of 355 * the list. If not, put the entry at the end of the list. 356 * Reposition the current pointer of the handle to the last entry 357 * in the list. 358 */ 359 mutex_lock(&ni_lock); 360 if (ni.head == NULL) { /* first entry */ 361 ni.head = ni.tail = list; 362 } 363 else { 364 ni.tail->next = list; 365 ni.tail = ni.tail->next; 366 } 367 ncp->nc_configs = ni.tail; 368 result = ni.tail->ncp; 369 mutex_unlock(&ni_lock); 370 return(result); 371 } 372 } 373 374 /* 375 * endnetconfig() may be called to "unbind" or "close" the netconfig database 376 * when processing is complete, releasing resources for reuse. endnetconfig() 377 * may not be called before setnetconfig(). endnetconfig() returns 0 on 378 * success and -1 on failure (for example, if setnetconfig() was not called 379 * previously). 380 */ 381 int 382 endnetconfig(handlep) 383 void *handlep; 384 { 385 struct netconfig_vars *nc_handlep = (struct netconfig_vars *)handlep; 386 387 struct netconfig_list *q, *p; 388 389 /* 390 * Verify that handle is valid 391 */ 392 if (nc_handlep == NULL || (nc_handlep->valid != NC_VALID && 393 nc_handlep->valid != NC_STORAGE)) { 394 nc_error = NC_NOTINIT; 395 return (-1); 396 } 397 398 /* 399 * Return 0 if anyone still needs it. 400 */ 401 nc_handlep->valid = NC_INVALID; 402 nc_handlep->flag = 0; 403 nc_handlep->nc_configs = NULL; 404 mutex_lock(&ni_lock); 405 if (--ni.ref > 0) { 406 mutex_unlock(&ni_lock); 407 free(nc_handlep); 408 return(0); 409 } 410 411 /* 412 * Noone needs these entries anymore, then frees them. 413 * Make sure all info in netconfig_info structure has been reinitialized. 414 */ 415 q = ni.head; 416 ni.eof = ni.ref = 0; 417 ni.head = NULL; 418 ni.tail = NULL; 419 mutex_unlock(&ni_lock); 420 421 while (q != NULL) { 422 p = q->next; 423 if (q->ncp->nc_lookups != NULL) free(q->ncp->nc_lookups); 424 free(q->ncp); 425 free(q->linep); 426 free(q); 427 q = p; 428 } 429 free(nc_handlep); 430 431 mutex_lock(&nc_file_lock); 432 fclose(nc_file); 433 nc_file = NULL; 434 mutex_unlock(&nc_file_lock); 435 436 return (0); 437 } 438 439 /* 440 * getnetconfigent(netid) returns a pointer to the struct netconfig structure 441 * corresponding to netid. It returns NULL if netid is invalid (that is, does 442 * not name an entry in the netconfig database). It returns NULL and sets 443 * errno in case of failure (for example, if the netconfig database cannot be 444 * opened). 445 */ 446 447 struct netconfig * 448 getnetconfigent(netid) 449 const char *netid; 450 { 451 FILE *file; /* NETCONFIG db's file pointer */ 452 char *linep; /* holds current netconfig line */ 453 char *stringp; /* temporary string pointer */ 454 struct netconfig *ncp = NULL; /* returned value */ 455 struct netconfig_list *list; /* pointer to cache list */ 456 457 nc_error = NC_NOTFOUND; /* default error. */ 458 if (netid == NULL || strlen(netid) == 0) { 459 return (NULL); 460 } 461 462 /* 463 * Look up table if the entries have already been read and parsed in 464 * getnetconfig(), then copy this entry into a buffer and return it. 465 * If we cannot find the entry in the current list and there are more 466 * entries in the netconfig db that has not been read, we then read the 467 * db and try find the match netid. 468 * If all the netconfig db has been read and placed into the list and 469 * there is no match for the netid, return NULL. 470 */ 471 mutex_lock(&ni_lock); 472 if (ni.head != NULL) { 473 for (list = ni.head; list; list = list->next) { 474 if (strcmp(list->ncp->nc_netid, netid) == 0) { 475 mutex_unlock(&ni_lock); 476 return(dup_ncp(list->ncp)); 477 } 478 } 479 if (ni.eof == 1) { /* that's all the entries */ 480 mutex_unlock(&ni_lock); 481 return(NULL); 482 } 483 } 484 mutex_unlock(&ni_lock); 485 486 487 if ((file = fopen(NETCONFIG, "r")) == NULL) { 488 nc_error = NC_NONETCONFIG; 489 return (NULL); 490 } 491 492 if ((linep = malloc(MAXNETCONFIGLINE)) == NULL) { 493 fclose(file); 494 nc_error = NC_NOMEM; 495 return (NULL); 496 } 497 do { 498 ptrdiff_t len; 499 char *tmpp; /* tmp string pointer */ 500 501 do { 502 if ((stringp = fgets(linep, MAXNETCONFIGLINE, file)) == NULL) { 503 break; 504 } 505 } while (*stringp == '#'); 506 if (stringp == NULL) { /* eof */ 507 break; 508 } 509 if ((tmpp = strpbrk(stringp, "\t ")) == NULL) { /* can't parse file */ 510 nc_error = NC_BADFILE; 511 break; 512 } 513 if (strlen(netid) == (size_t) (len = tmpp - stringp) && /* a match */ 514 strncmp(stringp, netid, (size_t)len) == 0) { 515 if ((ncp = (struct netconfig *) 516 malloc(sizeof (struct netconfig))) == NULL) { 517 break; 518 } 519 ncp->nc_lookups = NULL; 520 if (parse_ncp(linep, ncp) == -1) { 521 free(ncp); 522 ncp = NULL; 523 } 524 break; 525 } 526 } while (stringp != NULL); 527 if (ncp == NULL) { 528 free(linep); 529 } 530 fclose(file); 531 return(ncp); 532 } 533 534 /* 535 * freenetconfigent(netconfigp) frees the netconfig structure pointed to by 536 * netconfigp (previously returned by getnetconfigent()). 537 */ 538 539 void 540 freenetconfigent(netconfigp) 541 struct netconfig *netconfigp; 542 { 543 if (netconfigp != NULL) { 544 free(netconfigp->nc_netid); /* holds all netconfigp's strings */ 545 if (netconfigp->nc_lookups != NULL) 546 free(netconfigp->nc_lookups); 547 free(netconfigp); 548 } 549 return; 550 } 551 552 /* 553 * Parse line and stuff it in a struct netconfig 554 * Typical line might look like: 555 * udp tpi_cots vb inet udp /dev/udp /usr/lib/ip.so,/usr/local/ip.so 556 * 557 * We return -1 if any of the tokens don't parse, or malloc fails. 558 * 559 * Note that we modify stringp (putting NULLs after tokens) and 560 * we set the ncp's string field pointers to point to these tokens within 561 * stringp. 562 */ 563 564 static int 565 parse_ncp(stringp, ncp) 566 char *stringp; /* string to parse */ 567 struct netconfig *ncp; /* where to put results */ 568 { 569 char *tokenp; /* for processing tokens */ 570 char *lasts; 571 char **nc_lookups; 572 573 nc_error = NC_BADFILE; /* nearly anything that breaks is for this reason */ 574 stringp[strlen(stringp)-1] = '\0'; /* get rid of newline */ 575 /* netid */ 576 if ((ncp->nc_netid = strtok_r(stringp, "\t ", &lasts)) == NULL) { 577 return (-1); 578 } 579 580 /* semantics */ 581 if ((tokenp = strtok_r(NULL, "\t ", &lasts)) == NULL) { 582 return (-1); 583 } 584 if (strcmp(tokenp, NC_TPI_COTS_ORD_S) == 0) 585 ncp->nc_semantics = NC_TPI_COTS_ORD; 586 else if (strcmp(tokenp, NC_TPI_COTS_S) == 0) 587 ncp->nc_semantics = NC_TPI_COTS; 588 else if (strcmp(tokenp, NC_TPI_CLTS_S) == 0) 589 ncp->nc_semantics = NC_TPI_CLTS; 590 else if (strcmp(tokenp, NC_TPI_RAW_S) == 0) 591 ncp->nc_semantics = NC_TPI_RAW; 592 else 593 return (-1); 594 595 /* flags */ 596 if ((tokenp = strtok_r(NULL, "\t ", &lasts)) == NULL) { 597 return (-1); 598 } 599 for (ncp->nc_flag = NC_NOFLAG; *tokenp != '\0'; 600 tokenp++) { 601 switch (*tokenp) { 602 case NC_NOFLAG_C: 603 break; 604 case NC_VISIBLE_C: 605 ncp->nc_flag |= NC_VISIBLE; 606 break; 607 case NC_BROADCAST_C: 608 ncp->nc_flag |= NC_BROADCAST; 609 break; 610 default: 611 return (-1); 612 } 613 } 614 /* protocol family */ 615 if ((ncp->nc_protofmly = strtok_r(NULL, "\t ", &lasts)) == NULL) { 616 return (-1); 617 } 618 /* protocol name */ 619 if ((ncp->nc_proto = strtok_r(NULL, "\t ", &lasts)) == NULL) { 620 return (-1); 621 } 622 /* network device */ 623 if ((ncp->nc_device = strtok_r(NULL, "\t ", &lasts)) == NULL) { 624 return (-1); 625 } 626 if ((tokenp = strtok_r(NULL, "\t ", &lasts)) == NULL) { 627 return (-1); 628 } 629 if (strcmp(tokenp, NC_NOLOOKUP) == 0) { 630 ncp->nc_nlookups = 0; 631 ncp->nc_lookups = NULL; 632 } else { 633 char *cp; /* tmp string */ 634 635 if (ncp->nc_lookups != NULL) /* from last visit */ 636 free(ncp->nc_lookups); 637 ncp->nc_lookups = NULL; 638 ncp->nc_nlookups = 0; 639 while ((cp = tokenp) != NULL) { 640 if ((nc_lookups = realloc(ncp->nc_lookups, 641 (ncp->nc_nlookups + 1) * sizeof *ncp->nc_lookups)) == NULL) { 642 free(ncp->nc_lookups); 643 ncp->nc_lookups = NULL; 644 return (-1); 645 } 646 tokenp = _get_next_token(cp, ','); 647 ncp->nc_lookups = nc_lookups; 648 ncp->nc_lookups[ncp->nc_nlookups++] = cp; 649 } 650 } 651 return (0); 652 } 653 654 655 /* 656 * Returns a string describing the reason for failure. 657 */ 658 char * 659 nc_sperror() 660 { 661 const char *message; 662 663 switch(nc_error) { 664 case NC_NONETCONFIG: 665 message = _nc_errors[0]; 666 break; 667 case NC_NOMEM: 668 message = _nc_errors[1]; 669 break; 670 case NC_NOTINIT: 671 message = _nc_errors[2]; 672 break; 673 case NC_BADFILE: 674 message = _nc_errors[3]; 675 break; 676 case NC_NOTFOUND: 677 message = _nc_errors[4]; 678 break; 679 default: 680 message = "Unknown network selection error"; 681 } 682 /* LINTED const castaway */ 683 return ((char *)message); 684 } 685 686 /* 687 * Prints a message onto standard error describing the reason for failure. 688 */ 689 void 690 nc_perror(s) 691 const char *s; 692 { 693 fprintf(stderr, "%s: %s\n", s, nc_sperror()); 694 } 695 696 /* 697 * Duplicates the matched netconfig buffer. 698 */ 699 static struct netconfig * 700 dup_ncp(ncp) 701 struct netconfig *ncp; 702 { 703 struct netconfig *p; 704 char *tmp; 705 u_int i; 706 707 if ((tmp=malloc(MAXNETCONFIGLINE)) == NULL) 708 return(NULL); 709 if ((p=(struct netconfig *)malloc(sizeof(struct netconfig))) == NULL) { 710 free(tmp); 711 return(NULL); 712 } 713 /* 714 * First we dup all the data from matched netconfig buffer. Then we 715 * adjust some of the member pointer to a pre-allocated buffer where 716 * contains part of the data. 717 * To follow the convention used in parse_ncp(), we store all the 718 * necessary information in the pre-allocated buffer and let each 719 * of the netconfig char pointer member point to the right address 720 * in the buffer. 721 */ 722 *p = *ncp; 723 p->nc_netid = (char *)strcpy(tmp,ncp->nc_netid); 724 tmp = strchr(tmp, '\0') + 1; 725 p->nc_protofmly = (char *)strcpy(tmp,ncp->nc_protofmly); 726 tmp = strchr(tmp, '\0') + 1; 727 p->nc_proto = (char *)strcpy(tmp,ncp->nc_proto); 728 tmp = strchr(tmp, '\0') + 1; 729 p->nc_device = (char *)strcpy(tmp,ncp->nc_device); 730 p->nc_lookups = (char **)malloc((size_t)(p->nc_nlookups+1) * sizeof(char *)); 731 if (p->nc_lookups == NULL) { 732 free(p->nc_netid); 733 free(p); 734 return(NULL); 735 } 736 for (i=0; i < p->nc_nlookups; i++) { 737 tmp = strchr(tmp, '\0') + 1; 738 p->nc_lookups[i] = (char *)strcpy(tmp,ncp->nc_lookups[i]); 739 } 740 return(p); 741 } 742