1 /*
2 * lib/addr.c Abstract Address
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation version 2.1
7 * of the License.
8 *
9 * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
10 */
11
12 /**
13 * @ingroup core
14 * @defgroup addr Abstract Address
15 *
16 * @par 1) Transform character string to abstract address
17 * @code
18 * struct nl_addr *a = nl_addr_parse("::1", AF_UNSPEC);
19 * printf("Address family: %s\n", nl_af2str(nl_addr_get_family(a)));
20 * nl_addr_put(a);
21 * a = nl_addr_parse("11:22:33:44:55:66", AF_UNSPEC);
22 * printf("Address family: %s\n", nl_af2str(nl_addr_get_family(a)));
23 * nl_addr_put(a);
24 * @endcode
25 * @{
26 */
27
28 #include <netlink-local.h>
29 #include <netlink/netlink.h>
30 #include <netlink/utils.h>
31 #include <netlink/addr.h>
32 #include <linux/socket.h>
33
34 /* All this DECnet stuff is stolen from iproute2, thanks to whoever wrote
35 * this, probably Alexey. */
dn_ntohs(uint16_t addr)36 static inline uint16_t dn_ntohs(uint16_t addr)
37 {
38 union {
39 uint8_t byte[2];
40 uint16_t word;
41 } u = {
42 .word = addr,
43 };
44
45 return ((uint16_t) u.byte[0]) | (((uint16_t) u.byte[1]) << 8);
46 }
47
do_digit(char * str,uint16_t * addr,uint16_t scale,size_t * pos,size_t len,int * started)48 static inline int do_digit(char *str, uint16_t *addr, uint16_t scale,
49 size_t *pos, size_t len, int *started)
50 {
51 uint16_t tmp = *addr / scale;
52
53 if (*pos == len)
54 return 1;
55
56 if (((tmp) > 0) || *started || (scale == 1)) {
57 *str = tmp + '0';
58 *started = 1;
59 (*pos)++;
60 *addr -= (tmp * scale);
61 }
62
63 return 0;
64 }
65
dnet_ntop(char * addrbuf,size_t addrlen,char * str,size_t len)66 static const char *dnet_ntop(char *addrbuf, size_t addrlen, char *str,
67 size_t len)
68 {
69 uint16_t addr = dn_ntohs(*(uint16_t *)addrbuf);
70 uint16_t area = addr >> 10;
71 size_t pos = 0;
72 int started = 0;
73
74 if (addrlen != 2)
75 return NULL;
76
77 addr &= 0x03ff;
78
79 if (len == 0)
80 return str;
81
82 if (do_digit(str + pos, &area, 10, &pos, len, &started))
83 return str;
84
85 if (do_digit(str + pos, &area, 1, &pos, len, &started))
86 return str;
87
88 if (pos == len)
89 return str;
90
91 *(str + pos) = '.';
92 pos++;
93 started = 0;
94
95 if (do_digit(str + pos, &addr, 1000, &pos, len, &started))
96 return str;
97
98 if (do_digit(str + pos, &addr, 100, &pos, len, &started))
99 return str;
100
101 if (do_digit(str + pos, &addr, 10, &pos, len, &started))
102 return str;
103
104 if (do_digit(str + pos, &addr, 1, &pos, len, &started))
105 return str;
106
107 if (pos == len)
108 return str;
109
110 *(str + pos) = 0;
111
112 return str;
113 }
114
dnet_num(const char * src,uint16_t * dst)115 static int dnet_num(const char *src, uint16_t * dst)
116 {
117 int rv = 0;
118 int tmp;
119 *dst = 0;
120
121 while ((tmp = *src++) != 0) {
122 tmp -= '0';
123 if ((tmp < 0) || (tmp > 9))
124 return rv;
125
126 rv++;
127 (*dst) *= 10;
128 (*dst) += tmp;
129 }
130
131 return rv;
132 }
133
dnet_pton(const char * src,char * addrbuf)134 static inline int dnet_pton(const char *src, char *addrbuf)
135 {
136 uint16_t area = 0;
137 uint16_t node = 0;
138 int pos;
139
140 pos = dnet_num(src, &area);
141 if ((pos == 0) || (area > 63) ||
142 ((*(src + pos) != '.') && (*(src + pos) != ',')))
143 return -NLE_INVAL;
144
145 pos = dnet_num(src + pos + 1, &node);
146 if ((pos == 0) || (node > 1023))
147 return -NLE_INVAL;
148
149 *(uint16_t *)addrbuf = dn_ntohs((area << 10) | node);
150
151 return 1;
152 }
153
154 /**
155 * @name Creating Abstract Addresses
156 * @{
157 */
158
159 /**
160 * Allocate new abstract address object.
161 * @arg maxsize Maximum size of the binary address.
162 * @return Newly allocated address object or NULL
163 */
nl_addr_alloc(size_t maxsize)164 struct nl_addr *nl_addr_alloc(size_t maxsize)
165 {
166 struct nl_addr *addr;
167
168 addr = calloc(1, sizeof(*addr) + maxsize);
169 if (!addr)
170 return NULL;
171
172 addr->a_refcnt = 1;
173 addr->a_maxsize = maxsize;
174
175 return addr;
176 }
177
178 /**
179 * Allocate new abstract address object based on a binary address.
180 * @arg family Address family.
181 * @arg buf Buffer containing the binary address.
182 * @arg size Length of binary address buffer.
183 * @return Newly allocated address handle or NULL
184 */
nl_addr_build(int family,void * buf,size_t size)185 struct nl_addr *nl_addr_build(int family, void *buf, size_t size)
186 {
187 struct nl_addr *addr;
188
189 addr = nl_addr_alloc(size);
190 if (!addr)
191 return NULL;
192
193 addr->a_family = family;
194 addr->a_len = size;
195 addr->a_prefixlen = size*8;
196
197 if (size)
198 memcpy(addr->a_addr, buf, size);
199
200 return addr;
201 }
202
203 /**
204 * Allocate abstract address based on netlink attribute.
205 * @arg nla Netlink attribute of unspecific type.
206 * @arg family Address family.
207 *
208 * Considers the netlink attribute payload a address of the specified
209 * family and allocates a new abstract address based on it.
210 *
211 * @return Newly allocated address handle or NULL.
212 */
nl_addr_alloc_attr(struct nlattr * nla,int family)213 struct nl_addr *nl_addr_alloc_attr(struct nlattr *nla, int family)
214 {
215 return nl_addr_build(family, nla_data(nla), nla_len(nla));
216 }
217
218 /**
219 * Allocate abstract address object based on a character string
220 * @arg addrstr Address represented as character string.
221 * @arg hint Address family hint or AF_UNSPEC.
222 * @arg result Pointer to store resulting address.
223 *
224 * Regognizes the following address formats:
225 *@code
226 * Format Len Family
227 * ----------------------------------------------------------------
228 * IPv6 address format 16 AF_INET6
229 * ddd.ddd.ddd.ddd 4 AF_INET
230 * HH:HH:HH:HH:HH:HH 6 AF_LLC
231 * AA{.|,}NNNN 2 AF_DECnet
232 * HH:HH:HH:... variable AF_UNSPEC
233 * @endcode
234 *
235 * Special values:
236 * - none: All bits and length set to 0.
237 * - {default|all|any}: All bits set to 0, length based on hint or
238 * AF_INET if no hint is given.
239 *
240 * The prefix length may be appened at the end prefixed with a
241 * slash, e.g. 10.0.0.0/8.
242 *
243 * @return 0 on success or a negative error code.
244 */
nl_addr_parse(const char * addrstr,int hint,struct nl_addr ** result)245 int nl_addr_parse(const char *addrstr, int hint, struct nl_addr **result)
246 {
247 int err, copy = 0, len = 0, family = AF_UNSPEC;
248 char *str, *prefix, buf[32];
249 struct nl_addr *addr = NULL; /* gcc ain't that smart */
250
251 str = strdup(addrstr);
252 if (!str) {
253 err = -NLE_NOMEM;
254 goto errout;
255 }
256
257 prefix = strchr(str, '/');
258 if (prefix)
259 *prefix = '\0';
260
261 if (!strcasecmp(str, "none")) {
262 family = hint;
263 goto prefix;
264 }
265
266 if (!strcasecmp(str, "default") ||
267 !strcasecmp(str, "all") ||
268 !strcasecmp(str, "any")) {
269
270 switch (hint) {
271 case AF_INET:
272 case AF_UNSPEC:
273 /* Kind of a hack, we assume that if there is
274 * no hint given the user wants to have a IPv4
275 * address given back. */
276 family = AF_INET;
277 len = 4;
278 goto prefix;
279
280 case AF_INET6:
281 family = AF_INET6;
282 len = 16;
283 goto prefix;
284
285 case AF_LLC:
286 family = AF_LLC;
287 len = 6;
288 goto prefix;
289
290 default:
291 err = -NLE_AF_NOSUPPORT;
292 goto errout;
293 }
294 }
295
296 copy = 1;
297
298 if (hint == AF_INET || hint == AF_UNSPEC) {
299 if (inet_pton(AF_INET, str, buf) > 0) {
300 family = AF_INET;
301 len = 4;
302 goto prefix;
303 }
304 if (hint == AF_INET) {
305 err = -NLE_NOADDR;
306 goto errout;
307 }
308 }
309
310 if (hint == AF_INET6 || hint == AF_UNSPEC) {
311 if (inet_pton(AF_INET6, str, buf) > 0) {
312 family = AF_INET6;
313 len = 16;
314 goto prefix;
315 }
316 if (hint == AF_INET6) {
317 err = -NLE_NOADDR;
318 goto errout;
319 }
320 }
321
322 if ((hint == AF_LLC || hint == AF_UNSPEC) && strchr(str, ':')) {
323 unsigned int a, b, c, d, e, f;
324
325 if (sscanf(str, "%02x:%02x:%02x:%02x:%02x:%02x",
326 &a, &b, &c, &d, &e, &f) == 6) {
327 family = AF_LLC;
328 len = 6;
329 buf[0] = (unsigned char) a;
330 buf[1] = (unsigned char) b;
331 buf[2] = (unsigned char) c;
332 buf[3] = (unsigned char) d;
333 buf[4] = (unsigned char) e;
334 buf[5] = (unsigned char) f;
335 goto prefix;
336 }
337
338 if (hint == AF_LLC) {
339 err = -NLE_NOADDR;
340 goto errout;
341 }
342 }
343
344 if ((hint == AF_DECnet || hint == AF_UNSPEC) &&
345 (strchr(str, '.') || strchr(str, ','))) {
346 if (dnet_pton(str, buf) > 0) {
347 family = AF_DECnet;
348 len = 2;
349 goto prefix;
350 }
351 if (hint == AF_DECnet) {
352 err = -NLE_NOADDR;
353 goto errout;
354 }
355 }
356
357 if (hint == AF_UNSPEC && strchr(str, ':')) {
358 int i = 0;
359 char *s = str, *p;
360 for (;;) {
361 long l = strtol(s, &p, 16);
362
363 if (s == p || l > 0xff || i >= sizeof(buf)) {
364 err = -NLE_INVAL;
365 goto errout;
366 }
367
368 buf[i++] = (unsigned char) l;
369 if (*p == '\0')
370 break;
371 s = ++p;
372 }
373
374 len = i;
375 family = AF_UNSPEC;
376 goto prefix;
377 }
378
379 err = -NLE_NOADDR;
380 goto errout;
381
382 prefix:
383 addr = nl_addr_alloc(len);
384 if (!addr) {
385 err = -NLE_NOMEM;
386 goto errout;
387 }
388
389 nl_addr_set_family(addr, family);
390
391 if (copy)
392 nl_addr_set_binary_addr(addr, buf, len);
393
394 if (prefix) {
395 char *p;
396 long pl = strtol(++prefix, &p, 0);
397 if (p == prefix) {
398 nl_addr_destroy(addr);
399 err = -NLE_INVAL;
400 goto errout;
401 }
402 nl_addr_set_prefixlen(addr, pl);
403 } else
404 nl_addr_set_prefixlen(addr, len * 8);
405
406 *result = addr;
407 err = 0;
408 errout:
409 free(str);
410
411 return err;
412 }
413
414 /**
415 * Clone existing abstract address object.
416 * @arg addr Abstract address object.
417 * @return Newly allocated abstract address object being a duplicate of the
418 * specified address object or NULL if a failure occured.
419 */
nl_addr_clone(struct nl_addr * addr)420 struct nl_addr *nl_addr_clone(struct nl_addr *addr)
421 {
422 struct nl_addr *new;
423
424 new = nl_addr_build(addr->a_family, addr->a_addr, addr->a_len);
425 if (new)
426 new->a_prefixlen = addr->a_prefixlen;
427
428 return new;
429 }
430
431 /** @} */
432
433 /**
434 * @name Destroying Abstract Addresses
435 * @{
436 */
437
438 /**
439 * Destroy abstract address object.
440 * @arg addr Abstract address object.
441 */
nl_addr_destroy(struct nl_addr * addr)442 void nl_addr_destroy(struct nl_addr *addr)
443 {
444 if (!addr)
445 return;
446
447 if (addr->a_refcnt != 1)
448 BUG();
449
450 free(addr);
451 }
452
453 /** @} */
454
455 /**
456 * @name Managing Usage References
457 * @{
458 */
459
nl_addr_get(struct nl_addr * addr)460 struct nl_addr *nl_addr_get(struct nl_addr *addr)
461 {
462 addr->a_refcnt++;
463
464 return addr;
465 }
466
nl_addr_put(struct nl_addr * addr)467 void nl_addr_put(struct nl_addr *addr)
468 {
469 if (!addr)
470 return;
471
472 if (addr->a_refcnt == 1)
473 nl_addr_destroy(addr);
474 else
475 addr->a_refcnt--;
476 }
477
478 /**
479 * Check whether an abstract address object is shared.
480 * @arg addr Abstract address object.
481 * @return Non-zero if the abstract address object is shared, otherwise 0.
482 */
nl_addr_shared(struct nl_addr * addr)483 int nl_addr_shared(struct nl_addr *addr)
484 {
485 return addr->a_refcnt > 1;
486 }
487
488 /** @} */
489
490 /**
491 * @name Miscellaneous
492 * @{
493 */
494
495 /**
496 * Compares two abstract address objects.
497 * @arg a A abstract address object.
498 * @arg b Another abstract address object.
499 *
500 * @return Integer less than, equal to or greather than zero if \c is found,
501 * respectively to be less than, to, or be greater than \c b.
502 */
nl_addr_cmp(struct nl_addr * a,struct nl_addr * b)503 int nl_addr_cmp(struct nl_addr *a, struct nl_addr *b)
504 {
505 int d = a->a_family - b->a_family;
506
507 if (d == 0) {
508 d = a->a_len - b->a_len;
509
510 if (a->a_len && d == 0)
511 return memcmp(a->a_addr, b->a_addr, a->a_len);
512 }
513
514 return d;
515 }
516
517 /**
518 * Compares the prefix of two abstract address objects.
519 * @arg a A abstract address object.
520 * @arg b Another abstract address object.
521 *
522 * @return Integer less than, equal to or greather than zero if \c is found,
523 * respectively to be less than, to, or be greater than \c b.
524 */
nl_addr_cmp_prefix(struct nl_addr * a,struct nl_addr * b)525 int nl_addr_cmp_prefix(struct nl_addr *a, struct nl_addr *b)
526 {
527 int d = a->a_family - b->a_family;
528
529 if (d == 0) {
530 int len = min(a->a_prefixlen, b->a_prefixlen);
531 int bytes = len / 8;
532
533 d = memcmp(a->a_addr, b->a_addr, bytes);
534 if (d == 0) {
535 int mask = (1UL << (len % 8)) - 1UL;
536
537 d = (a->a_addr[bytes] & mask) -
538 (b->a_addr[bytes] & mask);
539 }
540 }
541
542 return d;
543 }
544
545 /**
546 * Returns true if the address consists of all zeros
547 * @arg addr Address to look at.
548 */
nl_addr_iszero(struct nl_addr * addr)549 int nl_addr_iszero(struct nl_addr *addr)
550 {
551 int i;
552
553 for (i = 0; i < addr->a_len; i++)
554 if (addr->a_addr[i])
555 return 0;
556
557 return 1;
558 }
559
560 /**
561 * Check if an address matches a certain family.
562 * @arg addr Address represented as character string.
563 * @arg family Desired address family.
564 *
565 * @return 1 if the address is of the desired address family,
566 * otherwise 0 is returned.
567 */
nl_addr_valid(char * addr,int family)568 int nl_addr_valid(char *addr, int family)
569 {
570 int ret;
571 char buf[32];
572
573 switch (family) {
574 case AF_INET:
575 case AF_INET6:
576 ret = inet_pton(family, addr, buf);
577 if (ret <= 0)
578 return 0;
579 break;
580
581 case AF_DECnet:
582 ret = dnet_pton(addr, buf);
583 if (ret <= 0)
584 return 0;
585 break;
586
587 case AF_LLC:
588 if (sscanf(addr, "%*02x:%*02x:%*02x:%*02x:%*02x:%*02x") != 6)
589 return 0;
590 break;
591 }
592
593 return 1;
594 }
595
596 /**
597 * Guess address family of an abstract address object based on address size.
598 * @arg addr Abstract address object.
599 * @return Address family or AF_UNSPEC if guessing wasn't successful.
600 */
nl_addr_guess_family(struct nl_addr * addr)601 int nl_addr_guess_family(struct nl_addr *addr)
602 {
603 switch (addr->a_len) {
604 case 4:
605 return AF_INET;
606 case 6:
607 return AF_LLC;
608 case 16:
609 return AF_INET6;
610 default:
611 return AF_UNSPEC;
612 }
613 }
614
615 /**
616 * Fill out sockaddr structure with values from abstract address object.
617 * @arg addr Abstract address object.
618 * @arg sa Destination sockaddr structure buffer.
619 * @arg salen Length of sockaddr structure buffer.
620 *
621 * Fills out the specified sockaddr structure with the data found in the
622 * specified abstract address. The salen argument needs to be set to the
623 * size of sa but will be modified to the actual size used during before
624 * the function exits.
625 *
626 * @return 0 on success or a negative error code
627 */
nl_addr_fill_sockaddr(struct nl_addr * addr,struct sockaddr * sa,socklen_t * salen)628 int nl_addr_fill_sockaddr(struct nl_addr *addr, struct sockaddr *sa,
629 socklen_t *salen)
630 {
631 switch (addr->a_family) {
632 case AF_INET: {
633 struct sockaddr_in *sai = (struct sockaddr_in *) sa;
634
635 if (*salen < sizeof(*sai))
636 return -NLE_INVAL;
637
638 sai->sin_family = addr->a_family;
639 memcpy(&sai->sin_addr, addr->a_addr, 4);
640 *salen = sizeof(*sai);
641 }
642 break;
643
644 case AF_INET6: {
645 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) sa;
646
647 if (*salen < sizeof(*sa6))
648 return -NLE_INVAL;
649
650 sa6->sin6_family = addr->a_family;
651 memcpy(&sa6->sin6_addr, addr->a_addr, 16);
652 *salen = sizeof(*sa6);
653 }
654 break;
655
656 default:
657 return -NLE_INVAL;
658 }
659
660 return 0;
661 }
662
663
664 /** @} */
665
666 /**
667 * @name Getting Information About Addresses
668 * @{
669 */
670
671 /**
672 * Call getaddrinfo() for an abstract address object.
673 * @arg addr Abstract address object.
674 * @arg result Pointer to store resulting address list.
675 *
676 * Calls getaddrinfo() for the specified abstract address in AI_NUMERICHOST
677 * mode.
678 *
679 * @note The caller is responsible for freeing the linked list using the
680 * interface provided by getaddrinfo(3).
681 *
682 * @return 0 on success or a negative error code.
683 */
nl_addr_info(struct nl_addr * addr,struct addrinfo ** result)684 int nl_addr_info(struct nl_addr *addr, struct addrinfo **result)
685 {
686 int err;
687 char buf[INET6_ADDRSTRLEN+5];
688 struct addrinfo hint = {
689 .ai_flags = AI_NUMERICHOST,
690 .ai_family = addr->a_family,
691 };
692
693 nl_addr2str(addr, buf, sizeof(buf));
694
695 err = getaddrinfo(buf, NULL, &hint, result);
696 if (err != 0) {
697 switch (err) {
698 case EAI_ADDRFAMILY: return -NLE_AF_NOSUPPORT;
699 case EAI_AGAIN: return -NLE_AGAIN;
700 case EAI_BADFLAGS: return -NLE_INVAL;
701 case EAI_FAIL: return -NLE_NOADDR;
702 case EAI_FAMILY: return -NLE_AF_NOSUPPORT;
703 case EAI_MEMORY: return -NLE_NOMEM;
704 case EAI_NODATA: return -NLE_NOADDR;
705 case EAI_NONAME: return -NLE_OBJ_NOTFOUND;
706 case EAI_SERVICE: return -NLE_OPNOTSUPP;
707 case EAI_SOCKTYPE: return -NLE_BAD_SOCK;
708 default: return -NLE_FAILURE;
709 }
710 }
711
712 return 0;
713 }
714
715 /**
716 * Resolve abstract address object to a name using getnameinfo().
717 * @arg addr Abstract address object.
718 * @arg host Destination buffer for host name.
719 * @arg hostlen Length of destination buffer.
720 *
721 * Resolves the abstract address to a name and writes the looked up result
722 * into the host buffer. getnameinfo() is used to perform the lookup and
723 * is put into NI_NAMEREQD mode so the function will fail if the lookup
724 * couldn't be performed.
725 *
726 * @return 0 on success or a negative error code.
727 */
nl_addr_resolve(struct nl_addr * addr,char * host,size_t hostlen)728 int nl_addr_resolve(struct nl_addr *addr, char *host, size_t hostlen)
729 {
730 int err;
731 struct sockaddr_in6 buf;
732 socklen_t salen = sizeof(buf);
733
734 err = nl_addr_fill_sockaddr(addr, (struct sockaddr *) &buf, &salen);
735 if (err < 0)
736 return err;
737
738 err = getnameinfo((struct sockaddr *) &buf, salen, host, hostlen,
739 NULL, 0, NI_NAMEREQD);
740 if (err < 0)
741 return nl_syserr2nlerr(err);
742
743 return 0;
744 }
745
746 /** @} */
747
748 /**
749 * @name Attributes
750 * @{
751 */
752
nl_addr_set_family(struct nl_addr * addr,int family)753 void nl_addr_set_family(struct nl_addr *addr, int family)
754 {
755 addr->a_family = family;
756 }
757
nl_addr_get_family(struct nl_addr * addr)758 int nl_addr_get_family(struct nl_addr *addr)
759 {
760 return addr->a_family;
761 }
762
763 /**
764 * Set binary address of abstract address object.
765 * @arg addr Abstract address object.
766 * @arg buf Buffer containing binary address.
767 * @arg len Length of buffer containing binary address.
768 */
nl_addr_set_binary_addr(struct nl_addr * addr,void * buf,size_t len)769 int nl_addr_set_binary_addr(struct nl_addr *addr, void *buf, size_t len)
770 {
771 if (len > addr->a_maxsize)
772 return -NLE_RANGE;
773
774 addr->a_len = len;
775 memcpy(addr->a_addr, buf, len);
776
777 return 0;
778 }
779
780 /**
781 * Get binary address of abstract address object.
782 * @arg addr Abstract address object.
783 */
nl_addr_get_binary_addr(struct nl_addr * addr)784 void *nl_addr_get_binary_addr(struct nl_addr *addr)
785 {
786 return addr->a_addr;
787 }
788
789 /**
790 * Get length of binary address of abstract address object.
791 * @arg addr Abstract address object.
792 */
nl_addr_get_len(struct nl_addr * addr)793 unsigned int nl_addr_get_len(struct nl_addr *addr)
794 {
795 return addr->a_len;
796 }
797
nl_addr_set_prefixlen(struct nl_addr * addr,int prefixlen)798 void nl_addr_set_prefixlen(struct nl_addr *addr, int prefixlen)
799 {
800 addr->a_prefixlen = prefixlen;
801 }
802
803 /**
804 * Get prefix length of abstract address object.
805 * @arg addr Abstract address object.
806 */
nl_addr_get_prefixlen(struct nl_addr * addr)807 unsigned int nl_addr_get_prefixlen(struct nl_addr *addr)
808 {
809 return addr->a_prefixlen;
810 }
811
812 /** @} */
813
814 /**
815 * @name Translations to Strings
816 * @{
817 */
818
819 /**
820 * Convert abstract address object to character string.
821 * @arg addr Abstract address object.
822 * @arg buf Destination buffer.
823 * @arg size Size of destination buffer.
824 *
825 * Converts an abstract address to a character string and stores
826 * the result in the specified destination buffer.
827 *
828 * @return Address represented in ASCII stored in destination buffer.
829 */
nl_addr2str(struct nl_addr * addr,char * buf,size_t size)830 char *nl_addr2str(struct nl_addr *addr, char *buf, size_t size)
831 {
832 int i;
833 char tmp[16];
834
835 if (!addr || !addr->a_len) {
836 snprintf(buf, size, "none");
837 if (addr)
838 goto prefix;
839 else
840 return buf;
841 }
842
843 switch (addr->a_family) {
844 case AF_INET:
845 inet_ntop(AF_INET, addr->a_addr, buf, size);
846 break;
847
848 case AF_INET6:
849 inet_ntop(AF_INET6, addr->a_addr, buf, size);
850 break;
851
852 case AF_DECnet:
853 dnet_ntop(addr->a_addr, addr->a_len, buf, size);
854 break;
855
856 case AF_LLC:
857 default:
858 snprintf(buf, size, "%02x",
859 (unsigned char) addr->a_addr[0]);
860 for (i = 1; i < addr->a_len; i++) {
861 snprintf(tmp, sizeof(tmp), ":%02x",
862 (unsigned char) addr->a_addr[i]);
863 strncat(buf, tmp, size - strlen(buf) - 1);
864 }
865 break;
866 }
867
868 prefix:
869 if (addr->a_prefixlen != (8 * addr->a_len)) {
870 snprintf(tmp, sizeof(tmp), "/%u", addr->a_prefixlen);
871 strncat(buf, tmp, size - strlen(buf) - 1);
872 }
873
874 return buf;
875 }
876
877 /** @} */
878
879 /**
880 * @name Address Family Transformations
881 * @{
882 */
883
884 static struct trans_tbl afs[] = {
885 __ADD(AF_UNSPEC,unspec)
886 __ADD(AF_UNIX,unix)
887 __ADD(AF_LOCAL,local)
888 __ADD(AF_INET,inet)
889 __ADD(AF_AX25,ax25)
890 __ADD(AF_IPX,ipx)
891 __ADD(AF_APPLETALK,appletalk)
892 __ADD(AF_NETROM,netrom)
893 __ADD(AF_BRIDGE,bridge)
894 __ADD(AF_ATMPVC,atmpvc)
895 __ADD(AF_X25,x25)
896 __ADD(AF_INET6,inet6)
897 __ADD(AF_ROSE,rose)
898 __ADD(AF_DECnet,decnet)
899 __ADD(AF_NETBEUI,netbeui)
900 __ADD(AF_SECURITY,security)
901 __ADD(AF_KEY,key)
902 __ADD(AF_NETLINK,netlink)
903 __ADD(AF_ROUTE,route)
904 __ADD(AF_PACKET,packet)
905 __ADD(AF_ASH,ash)
906 __ADD(AF_ECONET,econet)
907 __ADD(AF_ATMSVC,atmsvc)
908 __ADD(AF_SNA,sna)
909 __ADD(AF_IRDA,irda)
910 __ADD(AF_PPPOX,pppox)
911 __ADD(AF_WANPIPE,wanpipe)
912 __ADD(AF_LLC,llc)
913 __ADD(AF_BLUETOOTH,bluetooth)
914 };
915
nl_af2str(int family,char * buf,size_t size)916 char *nl_af2str(int family, char *buf, size_t size)
917 {
918 return __type2str(family, buf, size, afs, ARRAY_SIZE(afs));
919 }
920
nl_str2af(const char * name)921 int nl_str2af(const char *name)
922 {
923 int fam = __str2type(name, afs, ARRAY_SIZE(afs));
924 return fam >= 0 ? fam : AF_UNSPEC;
925 }
926
927 /** @} */
928
929 /** @} */
930