1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /*
28 * Copyright 2023 Oxide Computer Company
29 */
30
31 #include <netdb.h>
32 #include <arpa/inet.h>
33 #include <nss_dbdefs.h>
34 #include <netinet/in.h>
35 #include <sys/debug.h>
36 #include <sys/socket.h>
37 #include <string.h>
38 #include <strings.h>
39 #include <stdio.h>
40 #include <ctype.h>
41 #include <sys/types.h>
42 #include <stdlib.h>
43 #include <libintl.h>
44 #include <net/if.h>
45
46 #define ai2sin(x) ((struct sockaddr_in *)((x)->ai_addr))
47 #define ai2sin6(x) ((struct sockaddr_in6 *)((x)->ai_addr))
48
49 #define HOST_BROADCAST "255.255.255.255"
50
51 /*
52 * getaddrinfo() returns EAI_NONAME in some cases, however since EAI_NONAME is
53 * not part of SUSv3 it needed to be masked in the standards compliant
54 * environment. GAIV_DEFAULT and GAIV_XPG6 accomplish this.
55 */
56 #define GAIV_DEFAULT 0
57 #define GAIV_XPG6 1
58
59 /*
60 * Storage allocation for global variables in6addr_any and in6addr_loopback.
61 * The extern declarations for these variables are defined in <netinet/in.h>.
62 * These two variables could have been defined in any of the "C" files in
63 * libsocket. They are defined here with other IPv6 related interfaces.
64 */
65 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
66 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
67
68 /* AI_MASK: all valid flags for addrinfo */
69 #define AI_MASK (AI_PASSIVE | AI_CANONNAME | AI_NUMERICHOST \
70 | AI_ADDRCONFIG | AI_NUMERICSERV | AI_V4MAPPED | AI_ALL)
71 #define ANY 0
72
73 /*
74 * This is a private, undocumented, flag that getaddrinfo() uses for
75 * getipnodebyname(). In the case of AI_ADDRCONFIG && AI_V4MAPPED, if there are
76 * no IPv6 addresses, getaddrinfo() should return non-IPv4 mapped addresses. On
77 * the flip side, getipnodebyname() is defined by RFC 2553 to explicitly do so.
78 * Therefore this private flag indicates to getaddrinfo that we shouldn't do
79 * this.
80 */
81 #define AI_ADDRINFO 0x8000
82
83 typedef struct {
84 int si_socktype;
85 int si_protocol;
86 ushort_t si_port;
87 } spinfo_t;
88
89 /* function prototypes for used by getaddrinfo() routine */
90 static int get_addr(int, const char *, struct addrinfo *,
91 struct addrinfo *, spinfo_t *, uint_t, int);
92 static uint_t getscopeidfromzone(const struct sockaddr_in6 *,
93 const char *, uint32_t *);
94 static void servtype(const char *, int *, int *);
95 static boolean_t str_isnumber(const char *);
96
97 /*
98 * getaddrinfo:
99 *
100 * Purpose:
101 * Routine for performing Address-to-nodename in a protocol-independent
102 * fashion.
103 * Description and history of the routine:
104 * Nodename-to-address translation is done in a protocol- independent fashion
105 * using the getaddrinfo() function that is taken from IEEE POSIX 1003.1g.
106 *
107 * The official specification for this function will be the final POSIX
108 * standard, with the following additional requirements:
109 *
110 * - getaddrinfo() must be thread safe
111 * - The AI_NUMERICHOST is new.
112 * - All fields in socket address structures returned by getaddrinfo() that
113 * are not filled in through an explicit argument (e.g., sin6_flowinfo and
114 * sin_zero) must be set to 0. (This makes it easier to compare socket
115 * address structures).
116 *
117 * Input Parameters:
118 *
119 * nodename - pointer to a null-terminated string that represents
120 * a hostname or literal ip address (IPv4/IPv6), or this
121 * pointer can be NULL.
122 * servname - pointer to a null-terminated string that represents
123 * a servicename or literal port number, or this
124 * pointer can be NULL.
125 * hints - optional argument that points to an addrinfo structure
126 * to provide hints on the type of socket that the caller
127 * supports.
128 *
129 * Possible setting of the ai_flags member of the hints structure:
130 *
131 * AI_PASSIVE - If set, the caller plans to use the returned socket
132 * address in a call to bind(). In this case, it the
133 * nodename argument is NULL, then the IP address portion
134 * of the socket address structure will be set to
135 * INADDR_ANY for IPv4 or IN6ADDR_ANY_INIT for IPv6.
136 * If not set, then the returned socket address will be
137 * ready for a call to connect() (for conn-oriented) or
138 * connect(), sendto(), or sendmsg() (for connectionless).
139 * In this case, if nodename is NULL, then the IP address
140 * portion of the socket address structure will be set to
141 * the loopback address.
142 * AI_CANONNAME - If set, then upon successful return the ai_canonname
143 * field of the first addrinfo structure in the linked
144 * list will point to a NULL-terminated string
145 * containing the canonical name of the specified nodename.
146 * AI_NUMERICHOST - If set, then a non-NULL nodename string must be a numeric
147 * host address string. Otherwise an error of EAI_NONAME
148 * is returned. This flag prevents any type of name
149 * resolution service from being called.
150 * AI_NUMERICSERV - If set, then a non-null servname string supplied shall
151 * be a numeric port string. Otherwise, an [EAI_NONAME]
152 * error shall be returned. This flag shall prevent any
153 * type of name resolution service from being invoked.
154 * AI_ADDRCONFIG - If set, IPv4 addresses are returned only if an IPv4
155 * address is configured on the local system, and IPv6
156 * addresses are returned only if an IPv6 address is
157 * configured on the local system.
158 * AI_V4MAPPED - If set, along with an ai_family of AF_INET6, then
159 * getaddrinfo() shall return IPv4-mapped IPv6 addresses
160 * on finding no matching IPv6 addresses (ai_addrlen shall
161 * be 16). The AI_V4MAPPED flag shall be ignored unless
162 * ai_family equals AF_INET6.
163 * AI_ALL - If the AI_ALL flag is used with the AI_V4MAPPED flag,
164 * then getaddrinfo() shall return all matching IPv6 and
165 * IPv4 addresses. The AI_ALL flag without the AI_V4MAPPED
166 * flag is ignored.
167 *
168 * Output Parameters:
169 *
170 * res - upon successful return a pointer to a linked list of one
171 * or more addrinfo structures is returned through this
172 * argument. The caller can process each addrinfo structures
173 * in this list by following the ai_next pointer, until a
174 * NULL pointer is encountered. In each returned addrinfo
175 * structure the three members ai_family, ai_socktype, and
176 * ai_protocol are corresponding arguments for a call to the
177 * socket() function. In each addrinfo structure the ai_addr
178 * field points to filled-in socket address structure whose
179 * length is specified by the ai_addrlen member.
180 *
181 * Return Value:
182 * This function returns 0 upon success or a nonzero error code. The
183 * following names are nonzero error codes from getaddrinfo(), and are
184 * defined in <netdb.h>.
185 * EAI_ADDRFAMILY - address family not supported
186 * EAI_AGAIN - DNS temporary failure
187 * EAI_BADFLAGS - invalid ai_flags
188 * EAI_FAIL - DNS non-recoverable failure
189 * EAI_FAMILY - ai_family not supported
190 * EAI_MEMORY - memory allocation failure
191 * EAI_NODATA - no address associated with nodename
192 * EAI_NONAME - host/servname not known
193 * EAI_SERVICE - servname not supported for ai_socktype
194 * EAI_SOCKTYPE - ai_socktype not supported
195 * EAI_SYSTEM - system error in errno
196 *
197 * Memory Allocation:
198 * All of the information returned by getaddrinfo() is dynamically
199 * allocated: the addrinfo structures, and the socket address
200 * structures and canonical node name strings pointed to by the
201 * addrinfo structures.
202 */
203
204 static int
_getaddrinfo(const char * hostname,const char * servname,const struct addrinfo * hints,struct addrinfo ** res,int version)205 _getaddrinfo(const char *hostname, const char *servname,
206 const struct addrinfo *hints, struct addrinfo **res, int version)
207 {
208 struct addrinfo *cur;
209 struct addrinfo *aip;
210 struct addrinfo ai;
211 int error;
212
213 /*
214 * We currently accumulate three services in the
215 * SOCKTYPE_ANY/AI_NUMERICSERV case and one otherwise. If the logic in
216 * this function is extended to return all matches from the services
217 * database when AI_NUMERICSERV is not specified, this will need
218 * revisiting.
219 */
220 #define SPINFO_SIZE 3
221 spinfo_t spinfo[SPINFO_SIZE];
222 uint_t spidx = 0;
223 /* Note that these macros require spinfo and spidx to be in scope */
224 #define SP_ADDX(type, proto, port) \
225 do { \
226 ASSERT3U(spidx, <, SPINFO_SIZE); \
227 spinfo[spidx].si_socktype = (type); \
228 spinfo[spidx].si_protocol = (proto); \
229 spinfo[spidx].si_port = (port); \
230 spidx++; \
231 } while (0)
232 #define SP_ADD(sp) \
233 do { \
234 int _type, _proto; \
235 servtype((sp)->s_proto, &_type, &_proto); \
236 SP_ADDX(_type, _proto, (sp)->s_port); \
237 } while (0)
238
239 *res = NULL;
240
241 if (hostname == NULL && servname == NULL)
242 return (EAI_NONAME);
243
244 cur = &ai;
245 aip = &ai;
246
247 if (hints == NULL) {
248 aip->ai_flags = 0;
249 aip->ai_family = PF_UNSPEC;
250 aip->ai_socktype = ANY;
251 aip->ai_protocol = ANY;
252 } else {
253 (void) memcpy(aip, hints, sizeof (*aip));
254
255 /* check for bad flags in hints */
256 if (hints->ai_flags != 0 && (hints->ai_flags & ~AI_MASK))
257 return (EAI_BADFLAGS);
258
259 if ((hostname == NULL || *hostname == '\0') &&
260 (hints->ai_flags & AI_CANONNAME)) {
261 return (EAI_BADFLAGS);
262 }
263
264 if (hints->ai_family != PF_UNSPEC &&
265 hints->ai_family != PF_INET &&
266 hints->ai_family != PF_INET6) {
267 return (EAI_FAMILY);
268 }
269
270 switch (aip->ai_socktype) {
271 case ANY:
272 switch (aip->ai_protocol) {
273 case ANY:
274 break;
275 case IPPROTO_UDP:
276 aip->ai_socktype = SOCK_DGRAM;
277 break;
278 case IPPROTO_TCP:
279 case IPPROTO_SCTP:
280 aip->ai_socktype = SOCK_STREAM;
281 break;
282 default:
283 aip->ai_socktype = SOCK_RAW;
284 break;
285 }
286 break;
287 case SOCK_RAW:
288 break;
289 case SOCK_SEQPACKET:
290 /*
291 * If the hint does not have a preference on the
292 * protocol, use SCTP as the default for
293 * SOCK_SEQPACKET.
294 */
295 if (aip->ai_protocol == ANY)
296 aip->ai_protocol = IPPROTO_SCTP;
297 break;
298 case SOCK_DGRAM:
299 aip->ai_protocol = IPPROTO_UDP;
300 break;
301 case SOCK_STREAM:
302 /*
303 * If the hint does not have a preference on the
304 * protocol, use TCP as the default for SOCK_STREAM.
305 */
306 if (aip->ai_protocol == ANY)
307 aip->ai_protocol = IPPROTO_TCP;
308 break;
309 default:
310 return (EAI_SOCKTYPE);
311 }
312 }
313
314 aip->ai_addrlen = 0;
315 aip->ai_canonname = NULL;
316 aip->ai_addr = NULL;
317 aip->ai_next = NULL;
318 #ifdef __sparcv9
319 /*
320 * We need to clear _ai_pad to preserve binary compatibility with
321 * previously compiled 64-bit applications by guaranteeing the upper
322 * 32-bits are empty.
323 */
324 aip->_ai_pad = 0;
325 #endif /* __sparcv9 */
326
327 /*
328 * Get the service.
329 */
330
331 if (servname != NULL) {
332 struct servent result;
333 int bufsize = 128;
334 char *buf = NULL;
335 struct servent *sp;
336 const char *proto = NULL;
337
338 switch (aip->ai_socktype) {
339 case ANY:
340 case SOCK_RAW:
341 proto = NULL;
342 break;
343 case SOCK_DGRAM:
344 proto = "udp";
345 break;
346 case SOCK_STREAM:
347 /*
348 * If there is no hint given, use TCP as the default
349 * protocol.
350 */
351 switch (aip->ai_protocol) {
352 case ANY:
353 case IPPROTO_TCP:
354 default:
355 proto = "tcp";
356 break;
357 case IPPROTO_SCTP:
358 proto = "sctp";
359 break;
360 }
361 break;
362 case SOCK_SEQPACKET:
363 /* Default to SCTP if no hint given. */
364 switch (aip->ai_protocol) {
365 case ANY:
366 default:
367 proto = "sctp";
368 break;
369 }
370 break;
371 }
372 /*
373 * Servname string can be a decimal port number.
374 */
375 if (str_isnumber(servname)) {
376 ushort_t port = htons(atoi(servname));
377
378 if (aip->ai_socktype == ANY) {
379 /*
380 * The socket type is not known so we return
381 * one result for each of these types.
382 */
383 SP_ADDX(SOCK_STREAM, IPPROTO_TCP, port);
384 SP_ADDX(SOCK_DGRAM, IPPROTO_UDP, port);
385 SP_ADDX(SOCK_STREAM, IPPROTO_SCTP, port);
386 } else {
387 /*
388 * If we know the socket type then we can
389 * return it.
390 */
391 SP_ADDX(aip->ai_socktype, aip->ai_protocol,
392 port);
393 }
394 } else if (aip->ai_flags & AI_NUMERICSERV) {
395 /*
396 * The AI_NUMERICSERV flag was specified, but the
397 * servname is not a decimal number so we fail.
398 */
399 return (EAI_NONAME);
400 } else {
401 /*
402 * Look up the provided service name in the service
403 * database.
404 */
405 do {
406 buf = reallocf(buf, bufsize);
407 if (buf == NULL)
408 return (EAI_MEMORY);
409
410 sp = getservbyname_r(servname, proto, &result,
411 buf, bufsize);
412 if (sp == NULL && errno != ERANGE) {
413 free(buf);
414 return (EAI_SERVICE);
415 }
416 /*
417 * errno == ERANGE so our scratch buffer space
418 * wasn't big enough. Double it and try again.
419 */
420 bufsize *= 2;
421 } while (sp == NULL);
422 if (aip->ai_socktype != ANY) {
423 SP_ADDX(aip->ai_socktype, aip->ai_protocol,
424 sp->s_port);
425 } else {
426 SP_ADD(sp);
427 }
428 }
429 free(buf);
430
431 if (spidx == 0)
432 return (EAI_SERVICE);
433 } else {
434 SP_ADDX(aip->ai_socktype, aip->ai_protocol, 0);
435 }
436
437 error = get_addr(aip->ai_family, hostname, aip, cur,
438 spinfo, spidx, version);
439
440 if (error != 0) {
441 if (aip->ai_next != NULL)
442 freeaddrinfo(aip->ai_next);
443 return (error);
444 }
445
446 *res = aip->ai_next;
447 return (0);
448 }
449 #undef SP_ADD
450 #undef SP_ADDX
451
452 int
getaddrinfo(const char * hostname,const char * servname,const struct addrinfo * hints,struct addrinfo ** res)453 getaddrinfo(const char *hostname, const char *servname,
454 const struct addrinfo *hints, struct addrinfo **res)
455 {
456 return (_getaddrinfo(hostname, servname, hints, res, GAIV_DEFAULT));
457 }
458
459 int
__xnet_getaddrinfo(const char * hostname,const char * servname,const struct addrinfo * hints,struct addrinfo ** res)460 __xnet_getaddrinfo(const char *hostname, const char *servname,
461 const struct addrinfo *hints, struct addrinfo **res)
462 {
463 return (_getaddrinfo(hostname, servname, hints, res, GAIV_XPG6));
464 }
465
466 static int
add_address4(struct addrinfo * aip,struct addrinfo ** cur,struct in_addr * addr,const char * canonname,spinfo_t * info)467 add_address4(struct addrinfo *aip, struct addrinfo **cur,
468 struct in_addr *addr, const char *canonname, spinfo_t *info)
469 {
470 struct addrinfo *nai;
471 int addrlen;
472
473 nai = malloc(sizeof (struct addrinfo));
474 if (nai == NULL)
475 return (EAI_MEMORY);
476
477 *nai = *aip;
478 nai->ai_next = NULL;
479 addrlen = sizeof (struct sockaddr_in);
480
481 nai->ai_addr = malloc(addrlen);
482 if (nai->ai_addr == NULL) {
483 freeaddrinfo(nai);
484 return (EAI_MEMORY);
485 }
486
487 bzero(nai->ai_addr, addrlen);
488 nai->ai_addrlen = addrlen;
489 nai->ai_family = PF_INET;
490
491 (void) memcpy(&ai2sin(nai)->sin_addr, addr, sizeof (struct in_addr));
492 nai->ai_canonname = NULL;
493 if ((nai->ai_flags & AI_CANONNAME) && canonname != NULL) {
494 canonname = strdup(canonname);
495 if (canonname == NULL) {
496 freeaddrinfo(nai);
497 return (EAI_MEMORY);
498 }
499 nai->ai_canonname = (char *)canonname;
500 }
501 ai2sin(nai)->sin_family = PF_INET;
502 ai2sin(nai)->sin_port = info->si_port;
503 nai->ai_socktype = info->si_socktype;
504 nai->ai_protocol = info->si_protocol;
505
506 (*cur)->ai_next = nai;
507 *cur = nai;
508
509 return (0);
510 }
511
512 static int
add_address6(struct addrinfo * aip,struct addrinfo ** cur,struct in6_addr * addr,const char * zonestr,const char * canonname,spinfo_t * info)513 add_address6(struct addrinfo *aip, struct addrinfo **cur,
514 struct in6_addr *addr, const char *zonestr, const char *canonname,
515 spinfo_t *info)
516 {
517 struct addrinfo *nai;
518 int addrlen;
519
520 nai = malloc(sizeof (struct addrinfo));
521 if (nai == NULL)
522 return (EAI_MEMORY);
523
524 *nai = *aip;
525 nai->ai_next = NULL;
526 addrlen = sizeof (struct sockaddr_in6);
527
528 nai->ai_addr = malloc(addrlen);
529 if (nai->ai_addr == NULL) {
530 freeaddrinfo(nai);
531 return (EAI_MEMORY);
532 }
533
534 bzero(nai->ai_addr, addrlen);
535 nai->ai_addrlen = addrlen;
536 nai->ai_family = PF_INET6;
537
538 (void) memcpy(ai2sin6(nai)->sin6_addr.s6_addr,
539 &addr->s6_addr, sizeof (struct in6_addr));
540 nai->ai_canonname = NULL;
541 if ((nai->ai_flags & AI_CANONNAME) && canonname != NULL) {
542 canonname = strdup(canonname);
543 if (canonname == NULL) {
544 freeaddrinfo(nai);
545 return (EAI_MEMORY);
546 }
547 nai->ai_canonname = (char *)canonname;
548 }
549 ai2sin6(nai)->sin6_family = PF_INET6;
550 ai2sin6(nai)->sin6_port = info->si_port;
551 nai->ai_socktype = info->si_socktype;
552 nai->ai_protocol = info->si_protocol;
553
554 /* set sin6_scope_id */
555 if (zonestr != NULL) {
556 /* Translate 'zonestr' into a valid sin6_scope_id. */
557 int err = getscopeidfromzone(ai2sin6(nai), zonestr,
558 &ai2sin6(nai)->sin6_scope_id);
559 if (err != 0) {
560 freeaddrinfo(nai);
561 return (err);
562 }
563 } else {
564 ai2sin6(nai)->sin6_scope_id = 0;
565 }
566
567 (*cur)->ai_next = nai;
568 *cur = nai;
569
570 return (0);
571 }
572
573 static int
get_addr(int family,const char * hostname,struct addrinfo * aip,struct addrinfo * cur,spinfo_t * ports,uint_t nport,int version)574 get_addr(int family, const char *hostname, struct addrinfo *aip,
575 struct addrinfo *cur, spinfo_t *ports, uint_t nport, int version)
576 {
577 struct hostent *hp;
578 char _hostname[MAXHOSTNAMELEN];
579 int errnum;
580 boolean_t firsttime = B_TRUE;
581 char *zonestr = NULL;
582 uint_t i;
583
584 if (hostname == NULL) {
585 /*
586 * case 1: AI_PASSIVE bit set : anyaddr 0.0.0.0 or ::
587 * case 2: AI_PASSIVE bit not set : localhost 127.0.0.1 or ::1
588 */
589 const char *canon = "loopback";
590 errnum = 0;
591
592 /*
593 * PF_INET gets IPv4 only, PF_INET6 gets IPv6 only.
594 * PF_UNSPEC gets both.
595 */
596 if (family != PF_INET) {
597 struct in6_addr v6addr;
598
599 if (aip->ai_flags & AI_PASSIVE) {
600 (void) memcpy(&v6addr.s6_addr,
601 in6addr_any.s6_addr,
602 sizeof (struct in6_addr));
603 canon = NULL;
604 } else {
605 (void) memcpy(&v6addr.s6_addr,
606 in6addr_loopback.s6_addr,
607 sizeof (struct in6_addr));
608 }
609
610 for (i = 0; i < nport; i++) {
611 errnum = add_address6(aip, &cur, &v6addr, NULL,
612 canon, &ports[i]);
613 canon = NULL;
614 if (errnum != 0)
615 break;
616 }
617 }
618
619 if (errnum == 0 && family != PF_INET6) {
620 struct in_addr addr;
621
622 if (aip->ai_flags & AI_PASSIVE) {
623 addr.s_addr = INADDR_ANY;
624 canon = NULL;
625 } else {
626 addr.s_addr = htonl(INADDR_LOOPBACK);
627 }
628
629 for (i = 0; i < nport; i++) {
630 errnum = add_address4(aip, &cur, &addr, canon,
631 &ports[i]);
632 canon = NULL;
633 if (errnum != 0)
634 break;
635 }
636 }
637
638 return (errnum);
639 }
640
641 /*
642 * Check for existence of address-zoneid delimiter '%'
643 * If the delimiter exists, parse the zoneid portion of
644 * <addr>%<zone_id>
645 */
646 if ((zonestr = strchr(hostname, '%')) != NULL) {
647 /* make sure we have room for <addr> portion of hostname */
648 if ((zonestr - hostname) + 1 > sizeof (_hostname))
649 return (EAI_MEMORY);
650
651 /* chop off and save <zone_id> portion */
652 (void) strlcpy(_hostname, hostname, (zonestr - hostname) + 1);
653 ++zonestr; /* make zonestr point at start of <zone-id> */
654 /* ensure zone is valid */
655 if (*zonestr == '\0' || strlen(zonestr) > LIFNAMSIZ)
656 return (EAI_NONAME);
657 } else {
658 size_t hlen = sizeof (_hostname);
659
660 if (strlcpy(_hostname, hostname, hlen) >= hlen)
661 return (EAI_MEMORY);
662 }
663
664 /* Check to see if AI_NUMERICHOST bit is set */
665 if (aip->ai_flags & AI_NUMERICHOST) {
666 struct in6_addr v6addr;
667
668 /* check to see if _hostname points to a literal IP address */
669 if (!(inet_addr(_hostname) != ((in_addr_t)-1) ||
670 strcmp(_hostname, HOST_BROADCAST) == 0 ||
671 inet_pton(AF_INET6, _hostname, &v6addr) > 0)) {
672 return (EAI_NONAME);
673 }
674 }
675
676 /* if hostname argument is literal, name service doesn't get called */
677 if (family == PF_UNSPEC) {
678 hp = getipnodebyname(_hostname, AF_INET6,
679 AI_ALL | aip->ai_flags | AI_V4MAPPED | AI_ADDRINFO,
680 &errnum);
681 } else {
682 hp = getipnodebyname(_hostname, family, aip->ai_flags, &errnum);
683 }
684
685 if (hp == NULL) {
686 switch (errnum) {
687 case HOST_NOT_FOUND:
688 return (EAI_NONAME);
689 case TRY_AGAIN:
690 return (EAI_AGAIN);
691 case NO_RECOVERY:
692 return (EAI_FAIL);
693 case NO_ADDRESS:
694 if (version == GAIV_XPG6)
695 return (EAI_NONAME);
696 return (EAI_NODATA);
697 default:
698 return (EAI_SYSTEM);
699 }
700 }
701
702 for (i = 0; hp->h_addr_list[i]; i++) {
703 boolean_t create_v6_addrinfo = B_TRUE;
704 struct in_addr v4addr;
705 struct in6_addr v6addr;
706 uint_t j;
707
708 /* Determine if an IPv6 addrinfo structure should be created */
709 if (hp->h_addrtype == AF_INET6) {
710 struct in6_addr *v6addrp;
711
712 v6addrp = (struct in6_addr *)hp->h_addr_list[i];
713 if (!(aip->ai_flags & AI_V4MAPPED) &&
714 IN6_IS_ADDR_V4MAPPED(v6addrp)) {
715 create_v6_addrinfo = B_FALSE;
716 IN6_V4MAPPED_TO_INADDR(v6addrp, &v4addr);
717 } else {
718 (void) memcpy(&v6addr.s6_addr,
719 hp->h_addr_list[i],
720 sizeof (struct in6_addr));
721 }
722 } else if (hp->h_addrtype == AF_INET) {
723 create_v6_addrinfo = B_FALSE;
724 (void) memcpy(&v4addr.s_addr, hp->h_addr_list[i],
725 sizeof (struct in_addr));
726 } else {
727 return (EAI_SYSTEM);
728 }
729
730 for (j = 0; j < nport; j++) {
731 if (create_v6_addrinfo) {
732 errnum = add_address6(aip, &cur, &v6addr,
733 zonestr, firsttime ? hp->h_name : NULL,
734 &ports[j]);
735 } else {
736 errnum = add_address4(aip, &cur, &v4addr,
737 firsttime ? hp->h_name : NULL,
738 &ports[j]);
739 }
740 firsttime = B_FALSE;
741 if (errnum != 0) {
742 freehostent(hp);
743 return (errnum);
744 }
745 }
746 }
747 freehostent(hp);
748 return (0);
749 }
750
751 /*
752 * getscopeidfromzone(sa, zone, sin6_scope_id)
753 *
754 * Converts the string pointed to by 'zone' into a sin6_scope_id.
755 * 'zone' will either be a pointer to an interface name or will
756 * be a literal sin6_scope_id.
757 *
758 * 0 is returned on success and the output parameter 'sin6_scope_id' will
759 * be set to a valid sin6_scope_id.
760 * EAI_NONAME is returned for either of two reasons:
761 * 1. The IPv6 address pointed to by sa->sin6_addr is not
762 * part of the 'link scope' (ie link local, nodelocal multicast or
763 * linklocal multicast address)
764 * 2. The string pointed to by 'zone' can not be translate to a valid
765 * sin6_scope_id.
766 */
767 static uint_t
getscopeidfromzone(const struct sockaddr_in6 * sa,const char * zone,uint32_t * sin6_scope_id)768 getscopeidfromzone(const struct sockaddr_in6 *sa, const char *zone,
769 uint32_t *sin6_scope_id)
770 {
771 const in6_addr_t *addr = &sa->sin6_addr;
772 ulong_t ul_scope_id;
773 char *endp;
774
775 if (IN6_IS_ADDR_LINKSCOPE(addr)) {
776 /*
777 * Look up interface index associated with interface name
778 * pointed to by 'zone'. Since the address is part of the link
779 * scope, there is a one-to-one relationship between interface
780 * index and sin6_scope_id.
781 * If an interface index can not be found for 'zone', then
782 * treat 'zone' as a literal sin6_scope_id value.
783 */
784 if ((*sin6_scope_id = if_nametoindex(zone)) != 0) {
785 return (0);
786 } else {
787 if ((ul_scope_id = strtoul(zone, &endp, 10)) != 0) {
788 /* check that entire string was read */
789 if (*endp != '\0') {
790 return (EAI_NONAME);
791 }
792 *sin6_scope_id =
793 (uint32_t)(ul_scope_id & 0xffffffffUL);
794 } else {
795 return (EAI_NONAME);
796 }
797 }
798 } else {
799 return (EAI_NONAME);
800 }
801 return (0);
802 }
803
804 void
freeaddrinfo(struct addrinfo * ai)805 freeaddrinfo(struct addrinfo *ai)
806 {
807 struct addrinfo *next;
808
809 do {
810 next = ai->ai_next;
811 free(ai->ai_canonname);
812 free(ai->ai_addr);
813 free(ai);
814 ai = next;
815 } while (ai != NULL);
816 }
817
818 static void
servtype(const char * tag,int * type,int * proto)819 servtype(const char *tag, int *type, int *proto)
820 {
821 *type = *proto = 0;
822 if (strcmp(tag, "udp") == 0) {
823 *type = SOCK_DGRAM;
824 *proto = IPPROTO_UDP;
825 } else if (strcmp(tag, "tcp") == 0) {
826 *type = SOCK_STREAM;
827 *proto = IPPROTO_TCP;
828 } else if (strcmp(tag, "sctp") == 0) {
829 *type = SOCK_STREAM;
830 *proto = IPPROTO_SCTP;
831 }
832 }
833
834 static boolean_t
str_isnumber(const char * p)835 str_isnumber(const char *p)
836 {
837 char *q = (char *)p;
838 while (*q != '\0') {
839 if (!isdigit(*q))
840 return (B_FALSE);
841 q++;
842 }
843 return (B_TRUE);
844 }
845
846 static const char *gai_errlist[] = {
847 "name translation error 0 (no error)", /* 0 */
848 "specified address family not supported", /* 1 EAI_ADDRFAMILY */
849 "temporary name resolution failure", /* 2 EAI_AGAIN */
850 "invalid flags", /* 3 EAI_BADFLAGS */
851 "non-recoverable name resolution failure", /* 4 EAI_FAIL */
852 "specified address family not supported", /* 5 EAI_FAMILY */
853 "memory allocation failure", /* 6 EAI_MEMORY */
854 "no address for the specified node name", /* 7 EAI_NODATA */
855 "node name or service name not known", /* 8 EAI_NONAME */
856 "service name not available for the specified socket type",
857 /* 9 EAI_SERVICE */
858 "specified socket type not supported", /* 10 EAI_SOCKTYPE */
859 "system error", /* 11 EAI_SYSTEM */
860 };
861 static int gai_nerr = { sizeof (gai_errlist)/sizeof (gai_errlist[0]) };
862
863 const char *
gai_strerror(int ecode)864 gai_strerror(int ecode)
865 {
866 if (ecode < 0)
867 return (dgettext(TEXT_DOMAIN,
868 "name translation internal error"));
869 else if (ecode < gai_nerr)
870 return (dgettext(TEXT_DOMAIN, gai_errlist[ecode]));
871 return (dgettext(TEXT_DOMAIN, "unknown name translation error"));
872 }
873