2 * Copyright (C) 2004, 2005 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1999-2001 Internet Software Consortium.
5 * This code is derived from software contributed to ISC by
6 * Berkeley Software Design, Inc.
8 * Permission to use, copy, modify, and distribute this software for any
9 * purpose with or without fee is hereby granted, provided that the above
10 * copyright notice and this permission notice appear in all copies.
12 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND BERKELEY SOFTWARE DESIGN, INC.
13 * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
14 * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE
15 * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
18 * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21 /* $Id: getaddrinfo.c,v 1.41.206.3 2005/06/09 23:54:33 marka Exp $ */
28 #include <lwres/lwres.h>
29 #include <lwres/net.h>
30 #include <lwres/netdb.h>
31 #include <lwres/stdlib.h>
33 #define SA(addr) ((struct sockaddr *)(addr))
34 #define SIN(addr) ((struct sockaddr_in *)(addr))
35 #define SIN6(addr) ((struct sockaddr_in6 *)(addr))
36 #define SUN(addr) ((struct sockaddr_un *)(addr))
38 static struct addrinfo
39 *ai_reverse(struct addrinfo *oai),
40 *ai_clone(struct addrinfo *oai, int family),
41 *ai_alloc(int family, int addrlen);
43 static int get_local(const char *name, int socktype, struct addrinfo **res);
46 static int add_ipv4(const char *hostname, int flags, struct addrinfo **aip,
47 int socktype, int port);
48 static int add_ipv6(const char *hostname, int flags, struct addrinfo **aip,
49 int socktype, int port);
50 static void set_order(int, int (**)(const char *, int, struct addrinfo **,
53 #define FOUND_IPV4 0x1
54 #define FOUND_IPV6 0x2
57 #define ISC_AI_MASK (AI_PASSIVE|AI_CANONNAME|AI_NUMERICHOST)
60 lwres_getaddrinfo(const char *hostname, const char *servname,
61 const struct addrinfo *hints, struct addrinfo **res)
65 int family, socktype, flags, protocol;
66 struct addrinfo *ai, *ai_list;
68 int (*net_order[FOUND_MAX+1])(const char *, int, struct addrinfo **,
71 if (hostname == NULL && servname == NULL)
76 if ((hints->ai_flags & ~(ISC_AI_MASK)) != 0)
77 return (EAI_BADFLAGS);
78 if (hints->ai_addrlen || hints->ai_canonname ||
79 hints->ai_addr || hints->ai_next) {
83 family = hints->ai_family;
84 socktype = hints->ai_socktype;
85 protocol = hints->ai_protocol;
86 flags = hints->ai_flags;
89 switch (hints->ai_socktype) {
100 switch (hints->ai_socktype) {
112 return (EAI_SOCKTYPE);
117 switch (hints->ai_socktype) {
125 return (EAI_SOCKTYPE);
141 * First, deal with AF_LOCAL. If the family was not set,
142 * then assume AF_LOCAL if the first character of the
143 * hostname/servname is '/'.
146 if (hostname != NULL &&
147 (family == AF_LOCAL || (family == 0 && *hostname == '/')))
148 return (get_local(hostname, socktype, res));
150 if (servname != NULL &&
151 (family == AF_LOCAL || (family == 0 && *servname == '/')))
152 return (get_local(servname, socktype, res));
156 * Ok, only AF_INET and AF_INET6 left.
161 * First, look up the service name (port) if it was
162 * requested. If the socket type wasn't specified, then
163 * try and figure it out.
165 if (servname != NULL) {
168 port = strtol(servname, &e, 10);
171 return (EAI_SOCKTYPE);
172 if (port < 0 || port > 65535)
173 return (EAI_SERVICE);
174 port = htons((unsigned short) port);
176 sp = getservbyname(servname, proto);
178 return (EAI_SERVICE);
181 if (strcmp(sp->s_proto, "tcp") == 0)
182 socktype = SOCK_STREAM;
183 else if (strcmp(sp->s_proto, "udp") == 0)
184 socktype = SOCK_DGRAM;
191 * Next, deal with just a service name, and no hostname.
192 * (we verified that one of them was non-null up above).
194 if (hostname == NULL && (flags & AI_PASSIVE) != 0) {
195 if (family == AF_INET || family == 0) {
196 ai = ai_alloc(AF_INET, sizeof(struct sockaddr_in));
199 ai->ai_socktype = socktype;
200 ai->ai_protocol = protocol;
201 SIN(ai->ai_addr)->sin_port = port;
202 ai->ai_next = ai_list;
206 if (family == AF_INET6 || family == 0) {
207 ai = ai_alloc(AF_INET6, sizeof(struct sockaddr_in6));
209 lwres_freeaddrinfo(ai_list);
212 ai->ai_socktype = socktype;
213 ai->ai_protocol = protocol;
214 SIN6(ai->ai_addr)->sin6_port = port;
215 ai->ai_next = ai_list;
224 * If the family isn't specified or AI_NUMERICHOST specified,
225 * check first to see if it is a numeric address.
226 * Though the gethostbyname2() routine
227 * will recognize numeric addresses, it will only recognize
228 * the format that it is being called for. Thus, a numeric
229 * AF_INET address will be treated by the AF_INET6 call as
230 * a domain name, and vice versa. Checking for both numerics
233 if (hostname != NULL &&
234 (family == 0 || (flags & AI_NUMERICHOST) != 0)) {
235 char abuf[sizeof(struct in6_addr)];
236 char nbuf[NI_MAXHOST];
237 int addrsize, addroff;
238 #ifdef LWRES_HAVE_SIN6_SCOPE_ID
240 char ntmp[NI_MAXHOST];
241 lwres_uint32_t scopeid;
244 #ifdef LWRES_HAVE_SIN6_SCOPE_ID
246 * Scope identifier portion.
249 if (strchr(hostname, '%') != NULL) {
250 strncpy(ntmp, hostname, sizeof(ntmp) - 1);
251 ntmp[sizeof(ntmp) - 1] = '\0';
252 p = strchr(ntmp, '%');
256 * Vendors may want to support non-numeric
257 * scopeid around here.
261 scopeid = (lwres_uint32_t)strtoul(p + 1,
263 if (p != NULL && ep != NULL && ep[0] == '\0')
273 if (lwres_net_pton(AF_INET, hostname, (struct in_addr *)abuf)
276 if (family == AF_INET6) {
278 * Convert to a V4 mapped address.
280 struct in6_addr *a6 = (struct in6_addr *)abuf;
281 memcpy(&a6->s6_addr[12], &a6->s6_addr[0], 4);
282 memset(&a6->s6_addr[10], 0xff, 2);
283 memset(&a6->s6_addr[0], 0, 10);
286 addrsize = sizeof(struct in_addr);
287 addroff = (char *)(&SIN(0)->sin_addr) - (char *)0;
290 #ifdef LWRES_HAVE_SIN6_SCOPE_ID
291 } else if (ntmp[0] != '\0' &&
292 lwres_net_pton(AF_INET6, ntmp, abuf) == 1)
294 if (family && family != AF_INET6)
296 addrsize = sizeof(struct in6_addr);
297 addroff = (char *)(&SIN6(0)->sin6_addr) - (char *)0;
301 } else if (lwres_net_pton(AF_INET6, hostname, abuf) == 1) {
302 if (family != 0 && family != AF_INET6)
305 addrsize = sizeof(struct in6_addr);
306 addroff = (char *)(&SIN6(0)->sin6_addr) - (char *)0;
310 ai = ai_clone(ai_list, family);
314 ai->ai_socktype = socktype;
315 SIN(ai->ai_addr)->sin_port = port;
316 memcpy((char *)ai->ai_addr + addroff, abuf, addrsize);
317 if (flags & AI_CANONNAME) {
318 #if defined(LWRES_HAVE_SIN6_SCOPE_ID)
319 if (ai->ai_family == AF_INET6)
320 SIN6(ai->ai_addr)->sin6_scope_id =
323 if (lwres_getnameinfo(ai->ai_addr,
324 ai->ai_addrlen, nbuf, sizeof(nbuf),
326 NI_NUMERICHOST) == 0) {
327 ai->ai_canonname = strdup(nbuf);
328 if (ai->ai_canonname == NULL)
331 /* XXX raise error? */
332 ai->ai_canonname = NULL;
336 } else if ((flags & AI_NUMERICHOST) != 0) {
341 set_order(family, net_order);
342 for (i = 0; i < FOUND_MAX; i++) {
343 if (net_order[i] == NULL)
345 err = (net_order[i])(hostname, flags, &ai_list,
355 ai_list = ai_reverse(ai_list);
362 lwres_strsep(char **stringp, const char *delim) {
363 char *string = *stringp;
371 for (s = string; *s != '\0'; s++) {
373 for (d = delim; (dc = *d) != '\0'; d++)
385 set_order(int family, int (**net_order)(const char *, int, struct addrinfo **,
394 *net_order++ = add_ipv4;
397 *net_order++ = add_ipv6;
401 order = getenv("NET_ORDER");
403 while (order != NULL) {
405 * We ignore any unknown names.
407 tok = lwres_strsep(&order, ":");
408 if (strcasecmp(tok, "inet6") == 0) {
409 if ((found & FOUND_IPV6) == 0)
410 *net_order++ = add_ipv6;
412 } else if (strcasecmp(tok, "inet") == 0 ||
413 strcasecmp(tok, "inet4") == 0) {
414 if ((found & FOUND_IPV4) == 0)
415 *net_order++ = add_ipv4;
421 * Add in anything that we didn't find.
423 if ((found & FOUND_IPV4) == 0)
424 *net_order++ = add_ipv4;
425 if ((found & FOUND_IPV6) == 0)
426 *net_order++ = add_ipv6;
432 static char v4_loop[4] = { 127, 0, 0, 1 };
435 * The test against 0 is there to keep the Solaris compiler
436 * from complaining about "end-of-loop code not reached".
439 do { result = (code); \
440 if (result != 0) goto cleanup; \
444 add_ipv4(const char *hostname, int flags, struct addrinfo **aip,
445 int socktype, int port)
448 lwres_context_t *lwrctx = NULL;
449 lwres_gabnresponse_t *by = NULL;
451 lwres_result_t lwres;
454 lwres = lwres_context_create(&lwrctx, NULL, NULL, NULL, 0);
455 if (lwres != LWRES_R_SUCCESS)
457 (void) lwres_conf_parse(lwrctx, lwres_resolv_conf);
458 if (hostname == NULL && (flags & AI_PASSIVE) == 0) {
459 ai = ai_clone(*aip, AF_INET);
461 lwres_freeaddrinfo(*aip);
466 ai->ai_socktype = socktype;
467 SIN(ai->ai_addr)->sin_port = port;
468 memcpy(&SIN(ai->ai_addr)->sin_addr, v4_loop, 4);
470 lwres = lwres_getaddrsbyname(lwrctx, hostname,
471 LWRES_ADDRTYPE_V4, &by);
472 if (lwres != LWRES_R_SUCCESS) {
473 if (lwres == LWRES_R_NOTFOUND)
478 addr = LWRES_LIST_HEAD(by->addrs);
479 while (addr != NULL) {
480 ai = ai_clone(*aip, AF_INET);
482 lwres_freeaddrinfo(*aip);
486 ai->ai_socktype = socktype;
487 SIN(ai->ai_addr)->sin_port = port;
488 memcpy(&SIN(ai->ai_addr)->sin_addr,
490 if (flags & AI_CANONNAME) {
491 ai->ai_canonname = strdup(by->realname);
492 if (ai->ai_canonname == NULL)
495 addr = LWRES_LIST_NEXT(addr, link);
500 lwres_gabnresponse_free(lwrctx, &by);
501 if (lwrctx != NULL) {
502 lwres_conf_clear(lwrctx);
503 lwres_context_destroy(&lwrctx);
508 static char v6_loop[16] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 };
511 add_ipv6(const char *hostname, int flags, struct addrinfo **aip,
512 int socktype, int port)
515 lwres_context_t *lwrctx = NULL;
516 lwres_gabnresponse_t *by = NULL;
518 lwres_result_t lwres;
521 lwres = lwres_context_create(&lwrctx, NULL, NULL, NULL, 0);
522 if (lwres != LWRES_R_SUCCESS)
524 (void) lwres_conf_parse(lwrctx, lwres_resolv_conf);
526 if (hostname == NULL && (flags & AI_PASSIVE) == 0) {
527 ai = ai_clone(*aip, AF_INET6);
529 lwres_freeaddrinfo(*aip);
534 ai->ai_socktype = socktype;
535 SIN6(ai->ai_addr)->sin6_port = port;
536 memcpy(&SIN6(ai->ai_addr)->sin6_addr, v6_loop, 16);
538 lwres = lwres_getaddrsbyname(lwrctx, hostname,
539 LWRES_ADDRTYPE_V6, &by);
540 if (lwres != LWRES_R_SUCCESS) {
541 if (lwres == LWRES_R_NOTFOUND)
546 addr = LWRES_LIST_HEAD(by->addrs);
547 while (addr != NULL) {
548 ai = ai_clone(*aip, AF_INET6);
550 lwres_freeaddrinfo(*aip);
554 ai->ai_socktype = socktype;
555 SIN6(ai->ai_addr)->sin6_port = port;
556 memcpy(&SIN6(ai->ai_addr)->sin6_addr,
558 if (flags & AI_CANONNAME) {
559 ai->ai_canonname = strdup(by->realname);
560 if (ai->ai_canonname == NULL)
563 addr = LWRES_LIST_NEXT(addr, link);
568 lwres_gabnresponse_free(lwrctx, &by);
569 if (lwrctx != NULL) {
570 lwres_conf_clear(lwrctx);
571 lwres_context_destroy(&lwrctx);
577 lwres_freeaddrinfo(struct addrinfo *ai) {
578 struct addrinfo *ai_next;
581 ai_next = ai->ai_next;
582 if (ai->ai_addr != NULL)
584 if (ai->ai_canonname)
585 free(ai->ai_canonname);
593 get_local(const char *name, int socktype, struct addrinfo **res) {
595 struct sockaddr_un *sun;
598 return (EAI_SOCKTYPE);
600 ai = ai_alloc(AF_LOCAL, sizeof(*sun));
604 sun = SUN(ai->ai_addr);
605 strncpy(sun->sun_path, name, sizeof(sun->sun_path));
607 ai->ai_socktype = socktype;
609 * ai->ai_flags, ai->ai_protocol, ai->ai_canonname,
610 * and ai->ai_next were initialized to zero.
619 * Allocate an addrinfo structure, and a sockaddr structure
620 * of the specificed length. We initialize:
625 * ai_addr->sa_len (LWRES_PLATFORM_HAVESALEN)
626 * and everything else is initialized to zero.
628 static struct addrinfo *
629 ai_alloc(int family, int addrlen) {
632 ai = (struct addrinfo *)calloc(1, sizeof(*ai));
636 ai->ai_addr = SA(calloc(1, addrlen));
637 if (ai->ai_addr == NULL) {
641 ai->ai_addrlen = addrlen;
642 ai->ai_family = family;
643 ai->ai_addr->sa_family = family;
644 #ifdef LWRES_PLATFORM_HAVESALEN
645 ai->ai_addr->sa_len = addrlen;
650 static struct addrinfo *
651 ai_clone(struct addrinfo *oai, int family) {
654 ai = ai_alloc(family, ((family == AF_INET6) ?
655 sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in)));
658 lwres_freeaddrinfo(oai);
664 ai->ai_flags = oai->ai_flags;
665 ai->ai_socktype = oai->ai_socktype;
666 ai->ai_protocol = oai->ai_protocol;
667 ai->ai_canonname = NULL;
672 static struct addrinfo *
673 ai_reverse(struct addrinfo *oai) {
674 struct addrinfo *nai, *tai;
678 while (oai != NULL) {
680 * Grab one off the old list.
685 * Put it on the front of the new list.