struct asr_query *
getaddrinfo_async(const char *hostname, const char *servname,
const struct addrinfo *hints, void *asr)
{
struct asr_ctx *ac;
struct asr_query *as;
char alias[MAXDNAME];
ac = asr_use_resolver(asr);
if ((as = asr_async_new(ac, ASR_GETADDRINFO)) == NULL)
goto abort; /* errno set */
as->as_run = getaddrinfo_async_run;
if (hostname) {
if (asr_hostalias(ac, hostname, alias, sizeof(alias)))
hostname = alias;
if ((as->as.ai.hostname = strdup(hostname)) == NULL)
goto abort; /* errno set */
}
if (servname && (as->as.ai.servname = strdup(servname)) == NULL)
goto abort; /* errno set */
if (hints)
memmove(&as->as.ai.hints, hints, sizeof *hints);
else {
memset(&as->as.ai.hints, 0, sizeof as->as.ai.hints);
as->as.ai.hints.ai_family = PF_UNSPEC;
as->as.ai.hints.ai_flags = AI_ADDRCONFIG;
}
asr_ctx_unref(ac);
return (as);
abort:
if (as)
asr_async_free(as);
asr_ctx_unref(ac);
return (NULL);
}
static int
gethostnamadr_async_run(struct async *as, struct async_res *ar)
{
struct hostent_ext *h;
int r, type, saved_errno;
FILE *f;
char name[MAXDNAME], *data, addr[16], *c;
next:
switch (as->as_state) {
case ASR_STATE_INIT:
if (as->as.hostnamadr.family != AF_INET &&
as->as.hostnamadr.family != AF_INET6) {
ar->ar_h_errno = NETDB_INTERNAL;
ar->ar_errno = EAFNOSUPPORT;
async_set_state(as, ASR_STATE_HALT);
break;
}
if ((as->as.hostnamadr.family == AF_INET &&
as->as.hostnamadr.addrlen != INADDRSZ) ||
(as->as.hostnamadr.family == AF_INET6 &&
as->as.hostnamadr.addrlen != IN6ADDRSZ)) {
ar->ar_h_errno = NETDB_INTERNAL;
ar->ar_errno = EINVAL;
async_set_state(as, ASR_STATE_HALT);
break;
}
/* Name might be an IP address string */
if (as->as_type == ASR_GETHOSTBYNAME) {
for (c = as->as.hostnamadr.name; *c; c++)
if (!isdigit(*c) && *c != '.' && *c != ':')
break;
if (*c == 0 &&
inet_pton(as->as.hostnamadr.family,
as->as.hostnamadr.name, addr) == 1) {
h = hostent_from_addr(as->as.hostnamadr.family,
as->as.hostnamadr.name, addr);
if (h == NULL) {
ar->ar_errno = errno;
ar->ar_h_errno = NETDB_INTERNAL;
}
else {
ar->ar_hostent = &h->h;
ar->ar_h_errno = NETDB_SUCCESS;
}
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;
}
switch (AS_DB(as)) {
case ASR_DB_DNS:
/* Create a subquery to do the DNS lookup */
if (as->as_type == ASR_GETHOSTBYNAME) {
type = (as->as.hostnamadr.family == AF_INET) ?
T_A : T_AAAA;
as->as.hostnamadr.subq = res_search_async_ctx(
as->as.hostnamadr.name,
C_IN, type, as->as_ctx);
} else {
asr_addr_as_fqdn(as->as.hostnamadr.addr,
as->as.hostnamadr.family,
name, sizeof(name));
as->as.hostnamadr.subq = res_query_async_ctx(
name, C_IN, T_PTR, as->as_ctx);
}
if (as->as.hostnamadr.subq == NULL) {
ar->ar_errno = errno;
ar->ar_h_errno = NETDB_INTERNAL;
async_set_state(as, ASR_STATE_HALT);
break;
}
async_set_state(as, ASR_STATE_SUBQUERY);
break;
case ASR_DB_FILE:
/* Try to find a match in the host file */
if ((f = fopen(as->as_ctx->ac_hostfile, "r")) == NULL)
break;
if (as->as_type == ASR_GETHOSTBYNAME) {
data = asr_hostalias(as->as_ctx,
as->as.hostnamadr.name, name, sizeof(name));
if (data == NULL)
data = as->as.hostnamadr.name;
}
else
data = as->as.hostnamadr.addr;
h = hostent_file_match(f, as->as_type,
as->as.hostnamadr.family, data,
as->as.hostnamadr.addrlen);
saved_errno = errno;
fclose(f);
errno = saved_errno;
if (h == NULL) {
if (errno) {
ar->ar_errno = errno;
ar->ar_h_errno = NETDB_INTERNAL;
async_set_state(as, ASR_STATE_HALT);
}
/* otherwise not found */
break;
}
ar->ar_hostent = &h->h;
ar->ar_h_errno = NETDB_SUCCESS;
async_set_state(as, ASR_STATE_HALT);
break;
#ifdef YP
case ASR_DB_YP:
/* IPv4 only */
if (as->as.hostnamadr.family != AF_INET)
break;
if (as->as_type == ASR_GETHOSTBYNAME) {
data = asr_hostalias(as->as_ctx,
as->as.hostnamadr.name, name, sizeof(name));
if (data == NULL)
data = as->as.hostnamadr.name;
}
else
data = as->as.hostnamadr.addr;
h = _yp_gethostnamadr(as->as_type, data);
if (h == NULL) {
if (errno) {
ar->ar_errno = errno;
ar->ar_h_errno = NETDB_INTERNAL;
async_set_state(as, ASR_STATE_HALT);
}
/* otherwise not found */
break;
}
ar->ar_hostent = &h->h;
ar->ar_h_errno = NETDB_SUCCESS;
async_set_state(as, ASR_STATE_HALT);
break;
#endif
}
break;
case ASR_STATE_SUBQUERY:
/* Run the DNS subquery. */
if ((r = asr_async_run(as->as.hostnamadr.subq, ar)) == ASYNC_COND)
return (ASYNC_COND);
/* Done. */
as->as.hostnamadr.subq = NULL;
if (ar->ar_datalen == -1) {
async_set_state(as, ASR_STATE_NEXT_DB);
break;
}
/* If we got a packet but no anwser, use the next DB. */
if (ar->ar_count == 0) {
free(ar->ar_data);
as->as.hostnamadr.subq_h_errno = ar->ar_h_errno;
async_set_state(as, ASR_STATE_NEXT_DB);
break;
}
/* Read the hostent from the packet. */
h = hostent_from_packet(as->as_type,
as->as.hostnamadr.family, ar->ar_data, ar->ar_datalen);
free(ar->ar_data);
if (h == NULL) {
ar->ar_errno = errno;
ar->ar_h_errno = NETDB_INTERNAL;
async_set_state(as, ASR_STATE_HALT);
break;
}
if (as->as_type == ASR_GETHOSTBYADDR) {
if (hostent_add_addr(h, as->as.hostnamadr.addr,
as->as.hostnamadr.addrlen) == -1) {
free(h);
ar->ar_errno = errno;
ar->ar_h_errno = NETDB_INTERNAL;
async_set_state(as, ASR_STATE_HALT);
break;
}
}
/*
* No address found in the dns packet. The blocking version
* reports this as an error.
*/
if ((as->as_type == ASR_GETHOSTBYNAME &&
h->h.h_addr_list[0] == NULL) ||
(as->as_type == ASR_GETHOSTBYADDR &&
h->h.h_name == NULL)) {
free(h);
async_set_state(as, ASR_STATE_NEXT_DB);
break;
}
ar->ar_hostent = &h->h;
ar->ar_h_errno = NETDB_SUCCESS;
async_set_state(as, ASR_STATE_HALT);
break;
case ASR_STATE_NOT_FOUND:
ar->ar_errno = 0;
if (as->as.hostnamadr.subq_h_errno)
ar->ar_h_errno = as->as.hostnamadr.subq_h_errno;
else
ar->ar_h_errno = HOST_NOT_FOUND;
async_set_state(as, ASR_STATE_HALT);
break;
case ASR_STATE_HALT:
if (ar->ar_h_errno)
ar->ar_hostent = NULL;
else
ar->ar_errno = 0;
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;
}
