/*
* Use the sockaddr at "sa" to extend the result list on the "as" context,
* with the specified canonical name "cname". This function adds one
* entry per protocol/socktype match.
*/
static int
add_sockaddr(struct async *as, struct sockaddr *sa, const char *cname)
{
struct addrinfo *ai;
int i, port;
for(i = 0; matches[i].family != -1; i++) {
if (matches[i].family != sa->sa_family ||
!MATCH_SOCKTYPE(as->as.ai.hints.ai_socktype, i) ||
!MATCH_PROTO(as->as.ai.hints.ai_protocol, i))
continue;
if (matches[i].protocol == IPPROTO_TCP)
port = as->as.ai.port_tcp;
else if (matches[i].protocol == IPPROTO_UDP)
port = as->as.ai.port_udp;
else
port = 0;
ai = calloc(1, sizeof(*ai) + sa->sa_len);
if (ai == NULL)
return (EAI_MEMORY);
ai->ai_family = sa->sa_family;
ai->ai_socktype = matches[i].socktype;
ai->ai_protocol = matches[i].protocol;
ai->ai_addrlen = sa->sa_len;
ai->ai_addr = (void*)(ai + 1);
if (cname &&
as->as.ai.hints.ai_flags & (AI_CANONNAME | AI_FQDN)) {
if ((ai->ai_canonname = strdup(cname)) == NULL) {
free(ai);
return (EAI_MEMORY);
}
}
memmove(ai->ai_addr, sa, sa->sa_len);
if (sa->sa_family == PF_INET)
((struct sockaddr_in *)ai->ai_addr)->sin_port =
htons(port);
else if (sa->sa_family == PF_INET6)
((struct sockaddr_in6 *)ai->ai_addr)->sin6_port =
htons(port);
if (as->as.ai.aifirst == NULL)
as->as.ai.aifirst = ai;
if (as->as.ai.ailast)
as->as.ai.ailast->ai_next = ai;
as->as.ai.ailast = ai;
as->as_count += 1;
}
return (0);
}
static int
getaddrinfo_async_run(struct async *as, struct async_res *ar)
{
const char *str;
struct addrinfo *ai;
int i, family, r;
char fqdn[MAXDNAME];
union {
struct sockaddr sa;
struct sockaddr_in sain;
struct sockaddr_in6 sain6;
} sa;
next:
switch(as->as_state) {
case ASR_STATE_INIT:
/*
* First, make sure the parameters are valid.
*/
as->as_count = 0;
async_set_state(as, ASR_STATE_HALT);
ar->ar_errno = 0;
ar->ar_h_errno = NETDB_SUCCESS;
ar->ar_gai_errno = 0;
if (as->as.ai.hostname == NULL &&
as->as.ai.servname == NULL) {
ar->ar_h_errno = NO_RECOVERY;
ar->ar_gai_errno = EAI_NONAME;
break;
}
ai = &as->as.ai.hints;
if (ai->ai_addrlen ||
ai->ai_canonname ||
ai->ai_addr ||
ai->ai_next) {
ar->ar_h_errno = NO_RECOVERY;
ar->ar_gai_errno = EAI_BADHINTS;
break;
}
if (ai->ai_flags & ~AI_MASK ||
(ai->ai_flags & AI_CANONNAME && ai->ai_flags & AI_FQDN)) {
ar->ar_h_errno = NO_RECOVERY;
ar->ar_gai_errno = EAI_BADFLAGS;
break;
}
if (ai->ai_family != PF_UNSPEC &&
ai->ai_family != PF_INET &&
ai->ai_family != PF_INET6) {
ar->ar_h_errno = NO_RECOVERY;
ar->ar_gai_errno = EAI_FAMILY;
break;
}
if (ai->ai_socktype &&
ai->ai_socktype != SOCK_DGRAM &&
ai->ai_socktype != SOCK_STREAM &&
ai->ai_socktype != SOCK_RAW) {
ar->ar_h_errno = NO_RECOVERY;
ar->ar_gai_errno = EAI_SOCKTYPE;
break;
}
if (ai->ai_protocol &&
ai->ai_protocol != IPPROTO_UDP &&
ai->ai_protocol != IPPROTO_TCP) {
ar->ar_h_errno = NO_RECOVERY;
ar->ar_gai_errno = EAI_PROTOCOL;
break;
}
if (ai->ai_socktype == SOCK_RAW &&
as->as.ai.servname != NULL) {
ar->ar_h_errno = NO_RECOVERY;
ar->ar_gai_errno = EAI_SERVICE;
break;
}
/* Make sure there is at least a valid combination */
for (i = 0; matches[i].family != -1; i++)
if (MATCH_FAMILY(ai->ai_family, i) &&
MATCH_SOCKTYPE(ai->ai_socktype, i) &&
MATCH_PROTO(ai->ai_protocol, i))
break;
if (matches[i].family == -1) {
ar->ar_h_errno = NO_RECOVERY;
ar->ar_gai_errno = EAI_BADHINTS;
break;
}
if (as->as.ai.servname) {
as->as.ai.port_udp = get_port(as->as.ai.servname,
"udp", as->as.ai.hints.ai_flags & AI_NUMERICSERV);
as->as.ai.port_tcp = get_port(as->as.ai.servname,
"tcp", as->as.ai.hints.ai_flags & AI_NUMERICSERV);
if (as->as.ai.port_tcp < 0 || as->as.ai.port_udp < 0) {
ar->ar_h_errno = NO_RECOVERY;
ar->ar_gai_errno = EAI_SERVICE;
break;
}
}
/* If hostname is NULL, use local address */
if (as->as.ai.hostname == NULL) {
for(family = iter_family(as, 1);
family != -1;
family = iter_family(as, 0)) {
/*
* We could use statically built sockaddrs for
* those, rather than parsing over and over.
*/
if (family == PF_INET)
str = (ai->ai_flags & AI_PASSIVE) ? \
"0.0.0.0" : "127.0.0.1";
else /* PF_INET6 */
str = (ai->ai_flags & AI_PASSIVE) ? \
"::" : "::1";
/* This can't fail */
sockaddr_from_str(&sa.sa, family, str);
if ((r = add_sockaddr(as, &sa.sa, NULL))) {
ar->ar_errno = errno;
ar->ar_h_errno = NETDB_INTERNAL;
ar->ar_gai_errno = r;
async_set_state(as, ASR_STATE_HALT);
break;
}
}
if (ar->ar_gai_errno == 0 && as->as_count == 0) {
ar->ar_h_errno = NO_DATA;
ar->ar_gai_errno = EAI_NODATA;
}
break;
}
/* Try numeric addresses first */
for(family = iter_family(as, 1);
family != -1;
family = iter_family(as, 0)) {
if (sockaddr_from_str(&sa.sa, family,
as->as.ai.hostname) == -1)
continue;
if ((r = add_sockaddr(as, &sa.sa, NULL))) {
ar->ar_errno = errno;
ar->ar_h_errno = NETDB_INTERNAL;
ar->ar_gai_errno = r;
async_set_state(as, ASR_STATE_HALT);
break;
}
async_set_state(as, ASR_STATE_HALT);
break;
}
if (ar->ar_gai_errno || as->as_count)
break;
if (ai->ai_flags & AI_NUMERICHOST) {
ar->ar_h_errno = NO_RECOVERY;
ar->ar_gai_errno = EAI_FAIL;
async_set_state(as, ASR_STATE_HALT);
break;
}
/* Starting domain lookup */
async_set_state(as, ASR_STATE_SEARCH_DOMAIN);
break;
case ASR_STATE_SEARCH_DOMAIN:
r = asr_iter_domain(as, as->as.ai.hostname, fqdn, sizeof(fqdn));
if (r == -1) {
async_set_state(as, ASR_STATE_NOT_FOUND);
break;
}
if (r > (int)sizeof(fqdn)) {
ar->ar_errno = EINVAL;
ar->ar_h_errno = NO_RECOVERY;
ar->ar_gai_errno = EAI_OVERFLOW;
async_set_state(as, ASR_STATE_HALT);
break;
}
/*
* Create a subquery to lookup the host addresses.
* We use the special hostaddr_async() API, which has the
* nice property of honoring the "lookup" and "family" keyword
* in the configuration, thus returning the right address
* families in the right order, and thus fixing the current
* getaddrinfo() feature documented in the BUGS section of
* resolver.conf(5).
*/
as->as.ai.subq = hostaddr_async_ctx(fqdn,
as->as.ai.hints.ai_family, as->as.ai.hints.ai_flags,
as->as_ctx);
if (as->as.ai.subq == NULL) {
ar->ar_errno = errno;
if (errno == EINVAL) {
ar->ar_h_errno = NO_RECOVERY;
ar->ar_gai_errno = EAI_FAIL;
} else {
ar->ar_h_errno = NETDB_INTERNAL;
ar->ar_gai_errno = EAI_MEMORY;
}
async_set_state(as, ASR_STATE_HALT);
break;
}
async_set_state(as, ASR_STATE_LOOKUP_DOMAIN);
break;
case ASR_STATE_LOOKUP_DOMAIN:
/* Run the subquery */
if ((r = async_run(as->as.ai.subq, ar)) == ASYNC_COND)
return (ASYNC_COND);
/* Got one more address, use it to extend the result list. */
if (r == ASYNC_YIELD) {
if ((r = add_sockaddr(as, &ar->ar_sa.sa,
ar->ar_cname))) {
ar->ar_errno = errno;
ar->ar_h_errno = NETDB_INTERNAL;
ar->ar_gai_errno = r;
async_set_state(as, ASR_STATE_HALT);
}
if (ar->ar_cname)
free(ar->ar_cname);
break;
}
/*
* The subquery is done. Stop there if we have at least one
* answer.
*/
as->as.ai.subq = NULL;
if (ar->ar_count) {
async_set_state(as, ASR_STATE_HALT);
break;
}
/*
* No anwser for this domain, but we might be suggested to
* try again later, so remember this. Then search the next
* domain.
*/
if (ar->ar_gai_errno == EAI_AGAIN)
as->as.ai.flags |= ASYNC_AGAIN;
async_set_state(as, ASR_STATE_SEARCH_DOMAIN);
break;
case ASR_STATE_NOT_FOUND:
/*
* No result found. Maybe we can try again.
*/
ar->ar_errno = 0;
if (as->as.ai.flags & ASYNC_AGAIN) {
ar->ar_h_errno = TRY_AGAIN;
ar->ar_gai_errno = EAI_AGAIN;
} else {
ar->ar_h_errno = NO_DATA;
ar->ar_gai_errno = EAI_NODATA;
}
async_set_state(as, ASR_STATE_HALT);
break;
case ASR_STATE_HALT:
/* Set the results. */
if (ar->ar_gai_errno == 0) {
ar->ar_count = as->as_count;
ar->ar_addrinfo = as->as.ai.aifirst;
as->as.ai.aifirst = NULL;
} else {
ar->ar_count = 0;
ar->ar_addrinfo = NULL;
}
return (ASYNC_DONE);
default:
ar->ar_errno = EOPNOTSUPP;
ar->ar_h_errno = NETDB_INTERNAL;
ar->ar_gai_errno = EAI_SYSTEM;
async_set_state(as, ASR_STATE_HALT);
break;
}
goto next;
}
static int
getaddrinfo_async_run(struct asr_query *as, struct asr_result *ar)
{
#ifdef YP
static char *domain = NULL;
char *res;
int len;
char *name;
#endif
char fqdn[MAXDNAME];
const char *str;
struct addrinfo *ai;
int i, family, r;
FILE *f;
union {
struct sockaddr sa;
struct sockaddr_in sain;
struct sockaddr_in6 sain6;
} sa;
next:
switch (as->as_state) {
case ASR_STATE_INIT:
/*
* First, make sure the parameters are valid.
*/
as->as_count = 0;
if (as->as.ai.hostname == NULL &&
as->as.ai.servname == NULL) {
ar->ar_gai_errno = EAI_NONAME;
async_set_state(as, ASR_STATE_HALT);
break;
}
if (as->as.ai.hostname && as->as.ai.hostname[0] == '\0') {
ar->ar_gai_errno = EAI_NODATA;
async_set_state(as, ASR_STATE_HALT);
break;
}
ai = &as->as.ai.hints;
if (ai->ai_addrlen ||
ai->ai_canonname ||
ai->ai_addr ||
ai->ai_next) {
ar->ar_gai_errno = EAI_BADHINTS;
async_set_state(as, ASR_STATE_HALT);
break;
}
if (ai->ai_flags & ~AI_MASK ||
(ai->ai_flags & AI_CANONNAME && ai->ai_flags & AI_FQDN)) {
ar->ar_gai_errno = EAI_BADFLAGS;
async_set_state(as, ASR_STATE_HALT);
break;
}
if (ai->ai_family != PF_UNSPEC &&
ai->ai_family != PF_INET &&
ai->ai_family != PF_INET6) {
ar->ar_gai_errno = EAI_FAMILY;
async_set_state(as, ASR_STATE_HALT);
break;
}
if (ai->ai_socktype &&
ai->ai_socktype != SOCK_DGRAM &&
ai->ai_socktype != SOCK_STREAM &&
ai->ai_socktype != SOCK_RAW) {
ar->ar_gai_errno = EAI_SOCKTYPE;
async_set_state(as, ASR_STATE_HALT);
break;
}
if (ai->ai_socktype == SOCK_RAW &&
get_port(as->as.ai.servname, NULL, 1) != 0) {
ar->ar_gai_errno = EAI_SERVICE;
async_set_state(as, ASR_STATE_HALT);
break;
}
/* Restrict result set to configured address families */
if (ai->ai_flags & AI_ADDRCONFIG) {
if (addrconfig_setup(as) != 0) {
ar->ar_gai_errno = EAI_FAIL;
async_set_state(as, ASR_STATE_HALT);
break;
}
}
/* Make sure there is at least a valid combination */
for (i = 0; matches[i].family != -1; i++)
if (MATCH_FAMILY(ai->ai_family, i) &&
MATCH_SOCKTYPE(ai->ai_socktype, i) &&
MATCH_PROTO(ai->ai_protocol, i))
break;
if (matches[i].family == -1) {
ar->ar_gai_errno = EAI_BADHINTS;
async_set_state(as, ASR_STATE_HALT);
break;
}
if (ai->ai_protocol == 0 || ai->ai_protocol == IPPROTO_UDP)
as->as.ai.port_udp = get_port(as->as.ai.servname, "udp",
as->as.ai.hints.ai_flags & AI_NUMERICSERV);
if (ai->ai_protocol == 0 || ai->ai_protocol == IPPROTO_TCP)
as->as.ai.port_tcp = get_port(as->as.ai.servname, "tcp",
as->as.ai.hints.ai_flags & AI_NUMERICSERV);
if (as->as.ai.port_tcp == -2 || as->as.ai.port_udp == -2 ||
(as->as.ai.port_tcp == -1 && as->as.ai.port_udp == -1) ||
(ai->ai_protocol && (as->as.ai.port_udp == -1 ||
as->as.ai.port_tcp == -1))) {
ar->ar_gai_errno = EAI_SERVICE;
async_set_state(as, ASR_STATE_HALT);
break;
}
ar->ar_gai_errno = 0;
/* If hostname is NULL, use local address */
if (as->as.ai.hostname == NULL) {
for (family = iter_family(as, 1);
family != -1;
family = iter_family(as, 0)) {
/*
* We could use statically built sockaddrs for
* those, rather than parsing over and over.
*/
if (family == PF_INET)
str = (ai->ai_flags & AI_PASSIVE) ? \
"0.0.0.0" : "127.0.0.1";
else /* PF_INET6 */
str = (ai->ai_flags & AI_PASSIVE) ? \
"::" : "::1";
/* This can't fail */
asr_sockaddr_from_str(&sa.sa, family, str);
if ((r = addrinfo_add(as, &sa.sa, NULL))) {
ar->ar_gai_errno = r;
break;
}
}
if (ar->ar_gai_errno == 0 && as->as_count == 0) {
ar->ar_gai_errno = EAI_NODATA;
}
async_set_state(as, ASR_STATE_HALT);
break;
}
/* Try numeric addresses first */
for (family = iter_family(as, 1);
family != -1;
family = iter_family(as, 0)) {
if (asr_sockaddr_from_str(&sa.sa, family,
as->as.ai.hostname) == -1)
continue;
if ((r = addrinfo_add(as, &sa.sa, NULL)))
ar->ar_gai_errno = r;
break;
}
if (ar->ar_gai_errno || as->as_count) {
async_set_state(as, ASR_STATE_HALT);
break;
}
if (ai->ai_flags & AI_NUMERICHOST) {
ar->ar_gai_errno = EAI_NONAME;
async_set_state(as, ASR_STATE_HALT);
break;
}
async_set_state(as, ASR_STATE_NEXT_DB);
break;
case ASR_STATE_NEXT_DB:
if (asr_iter_db(as) == -1) {
async_set_state(as, ASR_STATE_NOT_FOUND);
break;
}
as->as_family_idx = 0;
async_set_state(as, ASR_STATE_SAME_DB);
break;
case ASR_STATE_NEXT_FAMILY:
as->as_family_idx += 1;
if (as->as.ai.hints.ai_family != AF_UNSPEC ||
AS_FAMILY(as) == -1) {
/* The family was specified, or we have tried all
* families with this DB.
*/
if (as->as_count) {
ar->ar_gai_errno = 0;
async_set_state(as, ASR_STATE_HALT);
} else
async_set_state(as, ASR_STATE_NEXT_DOMAIN);
break;
}
async_set_state(as, ASR_STATE_SAME_DB);
break;
case ASR_STATE_NEXT_DOMAIN:
/* domain search is only for dns */
if (AS_DB(as) != ASR_DB_DNS) {
async_set_state(as, ASR_STATE_NEXT_DB);
break;
}
as->as_family_idx = 0;
free(as->as.ai.fqdn);
as->as.ai.fqdn = NULL;
r = iter_domain(as, as->as.ai.hostname, fqdn, sizeof(fqdn));
if (r == -1) {
async_set_state(as, ASR_STATE_NEXT_DB);
break;
}
if (r == 0) {
ar->ar_gai_errno = EAI_FAIL;
async_set_state(as, ASR_STATE_HALT);
break;
}
as->as.ai.fqdn = strdup(fqdn);
if (as->as.ai.fqdn == NULL) {
ar->ar_gai_errno = EAI_MEMORY;
async_set_state(as, ASR_STATE_HALT);
}
async_set_state(as, ASR_STATE_SAME_DB);
break;
case ASR_STATE_SAME_DB:
/* query the current DB again */
switch (AS_DB(as)) {
case ASR_DB_DNS:
if (as->as.ai.fqdn == NULL) {
/* First try, initialize domain iteration */
as->as_dom_flags = 0;
as->as_dom_step = DOM_INIT;
async_set_state(as, ASR_STATE_NEXT_DOMAIN);
break;
}
family = (as->as.ai.hints.ai_family == AF_UNSPEC) ?
AS_FAMILY(as) : as->as.ai.hints.ai_family;
if (family == AF_INET &&
as->as.ai.flags & ASYNC_NO_INET) {
async_set_state(as, ASR_STATE_NEXT_FAMILY);
break;
} else if (family == AF_INET6 &&
as->as.ai.flags & ASYNC_NO_INET6) {
async_set_state(as, ASR_STATE_NEXT_FAMILY);
break;
}
as->as.ai.subq = res_query_async_ctx(as->as.ai.fqdn,
C_IN, (family == AF_INET6) ? T_AAAA : T_A,
as->as_ctx);
if (as->as.ai.subq == NULL) {
if (errno == ENOMEM)
ar->ar_gai_errno = EAI_MEMORY;
else
ar->ar_gai_errno = EAI_FAIL;
async_set_state(as, ASR_STATE_HALT);
break;
}
async_set_state(as, ASR_STATE_SUBQUERY);
break;
case ASR_DB_FILE:
f = fopen(_PATH_HOSTS, "re");
if (f == NULL) {
async_set_state(as, ASR_STATE_NEXT_DB);
break;
}
family = (as->as.ai.hints.ai_family == AF_UNSPEC) ?
AS_FAMILY(as) : as->as.ai.hints.ai_family;
r = addrinfo_from_file(as, family, f);
if (r == -1) {
if (errno == ENOMEM)
ar->ar_gai_errno = EAI_MEMORY;
else
ar->ar_gai_errno = EAI_FAIL;
async_set_state(as, ASR_STATE_HALT);
} else
async_set_state(as, ASR_STATE_NEXT_FAMILY);
fclose(f);
break;
#ifdef YP
case ASR_DB_YP:
if (!domain && _yp_check(&domain) == 0) {
async_set_state(as, ASR_STATE_NEXT_DB);
break;
}
family = (as->as.ai.hints.ai_family == AF_UNSPEC) ?
AS_FAMILY(as) : as->as.ai.hints.ai_family;
name = as->as.ai.hostname;
/* XXX
* ipnodes.byname could also contain IPv4 address
*/
r = yp_match(domain, (family == AF_INET6) ?
"ipnodes.byname" : "hosts.byname",
name, strlen(name), &res, &len);
if (r == 0) {
r = addrinfo_from_yp(as, family, res);
free(res);
if (r == -1) {
if (errno == ENOMEM)
ar->ar_gai_errno = EAI_MEMORY;
else
ar->ar_gai_errno = EAI_FAIL;
async_set_state(as, ASR_STATE_HALT);
break;
}
}
async_set_state(as, ASR_STATE_NEXT_FAMILY);
break;
#endif
default:
async_set_state(as, ASR_STATE_NEXT_DB);
}
break;
case ASR_STATE_SUBQUERY:
if ((r = asr_run(as->as.ai.subq, ar)) == ASYNC_COND)
return (ASYNC_COND);
as->as.ai.subq = NULL;
if (ar->ar_datalen == -1) {
async_set_state(as, ASR_STATE_NEXT_FAMILY);
break;
}
r = addrinfo_from_pkt(as, ar->ar_data, ar->ar_datalen);
if (r == -1) {
if (errno == ENOMEM)
ar->ar_gai_errno = EAI_MEMORY;
else
ar->ar_gai_errno = EAI_FAIL;
async_set_state(as, ASR_STATE_HALT);
} else
async_set_state(as, ASR_STATE_NEXT_FAMILY);
free(ar->ar_data);
break;
case ASR_STATE_NOT_FOUND:
/* No result found. Maybe we can try again. */
if (as->as.ai.flags & ASYNC_AGAIN)
ar->ar_gai_errno = EAI_AGAIN;
else
ar->ar_gai_errno = EAI_NODATA;
async_set_state(as, ASR_STATE_HALT);
break;
case ASR_STATE_HALT:
if (ar->ar_gai_errno == 0) {
ar->ar_count = as->as_count;
ar->ar_addrinfo = as->as.ai.aifirst;
as->as.ai.aifirst = NULL;
} else {
ar->ar_count = 0;
ar->ar_addrinfo = NULL;
}
return (ASYNC_DONE);
default:
ar->ar_errno = EOPNOTSUPP;
ar->ar_gai_errno = EAI_SYSTEM;
async_set_state(as, ASR_STATE_HALT);
break;
}
goto next;
}
/*
* Use the sockaddr at "sa" to extend the result list on the "as" context,
* with the specified canonical name "cname". This function adds one
* entry per protocol/socktype match.
*/
static int
addrinfo_add(struct asr_query *as, const struct sockaddr *sa, const char *cname)
{
struct addrinfo *ai;
int i, port, proto;
for (i = 0; matches[i].family != -1; i++) {
if (matches[i].family != sa->sa_family ||
!MATCH_SOCKTYPE(as->as.ai.hints.ai_socktype, i) ||
!MATCH_PROTO(as->as.ai.hints.ai_protocol, i))
continue;
proto = as->as.ai.hints.ai_protocol;
if (!proto)
proto = matches[i].protocol;
if (proto == IPPROTO_TCP)
port = as->as.ai.port_tcp;
else if (proto == IPPROTO_UDP)
port = as->as.ai.port_udp;
else
port = 0;
/* servname specified, but not defined for this protocol */
if (port == -1)
continue;
ai = calloc(1, sizeof(*ai) + SA_LEN(sa));
if (ai == NULL)
return (EAI_MEMORY);
ai->ai_family = sa->sa_family;
ai->ai_socktype = matches[i].socktype;
ai->ai_protocol = proto;
ai->ai_flags = as->as.ai.hints.ai_flags;
ai->ai_addrlen = SA_LEN(sa);
ai->ai_addr = (void *)(ai + 1);
if (cname &&
as->as.ai.hints.ai_flags & (AI_CANONNAME | AI_FQDN)) {
if ((ai->ai_canonname = strdup(cname)) == NULL) {
free(ai);
return (EAI_MEMORY);
}
}
memmove(ai->ai_addr, sa, SA_LEN(sa));
if (sa->sa_family == PF_INET)
((struct sockaddr_in *)ai->ai_addr)->sin_port =
htons(port);
else if (sa->sa_family == PF_INET6)
((struct sockaddr_in6 *)ai->ai_addr)->sin6_port =
htons(port);
if (as->as.ai.aifirst == NULL)
as->as.ai.aifirst = ai;
if (as->as.ai.ailast)
as->as.ai.ailast->ai_next = ai;
as->as.ai.ailast = ai;
as->as_count += 1;
}
return (0);
}