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
nc_key_init(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 *
__nc_error(void)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 *
setnetconfig(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 *
getnetconfig(void * handlep)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
endnetconfig(void * handlep)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 *
getnetconfigent(const char * netid)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
freenetconfigent(struct netconfig * netconfigp)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
parse_ncp(char * stringp,struct netconfig * ncp)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 *
nc_sperror(void)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
nc_perror(const char * s)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 *
dup_ncp(struct netconfig * ncp)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