struct asr_query *
gethostbyname2_async(const char *name, int af, void *asr)
{
struct asr_ctx *ac;
struct asr_query *as;
/* the original segfaults */
if (name == NULL) {
errno = EINVAL;
return (NULL);
}
ac = _asr_use_resolver(asr);
if ((as = _asr_async_new(ac, ASR_GETHOSTBYNAME)) == NULL)
goto abort; /* errno set */
as->as_run = gethostnamadr_async_run;
as->as.hostnamadr.family = af;
if (af == AF_INET)
as->as.hostnamadr.addrlen = INADDRSZ;
else if (af == AF_INET6)
as->as.hostnamadr.addrlen = IN6ADDRSZ;
as->as.hostnamadr.name = strdup(name);
if (as->as.hostnamadr.name == NULL)
goto abort; /* errno set */
_asr_ctx_unref(ac);
return (as);
abort:
if (as)
_asr_async_free(as);
_asr_ctx_unref(ac);
return (NULL);
}
struct asr_query *
gethostbyaddr_async(const void *addr, socklen_t len, int af, void *asr)
{
struct asr_ctx *ac;
struct asr_query *as;
ac = _asr_use_resolver(asr);
as = _gethostbyaddr_async_ctx(addr, len, af, ac);
_asr_ctx_unref(ac);
return (as);
}
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;
if (hints == NULL || (hints->ai_flags & AI_NUMERICHOST) == 0)
ac = _asr_use_resolver(asr);
else
ac = _asr_no_resolver();
if ((as = _asr_async_new(ac, ASR_GETADDRINFO)) == NULL)
goto abort; /* errno set */
as->as_run = getaddrinfo_async_run;
if (hostname) {
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 res_search_async_run(struct asr_query *, struct asr_result *);
static size_t domcat(const char *, const char *, char *, size_t);
/*
* Unlike res_query_async(), this function returns a valid packet only if
* h_errno is NETDB_SUCCESS.
*/
struct asr_query *
res_search_async(const char *name, int class, int type, void *asr)
{
struct asr_ctx *ac;
struct asr_query *as;
DPRINT("asr: res_search_async(\"%s\", %i, %i)\n", name, class, type);
ac = _asr_use_resolver(asr);
as = _res_search_async_ctx(name, class, type, ac);
_asr_ctx_unref(ac);
return (as);
}
DEF_WEAK(res_search_async);
struct asr_query *
_res_search_async_ctx(const char *name, int class, int type, struct asr_ctx *ac)
{
struct asr_query *as;
DPRINT("asr: res_search_async_ctx(\"%s\", %i, %i)\n", name, class,
type);
int
res_init(void)
{
static void *resinit_mutex;
struct asr_ctx *ac;
int i;
ac = _asr_use_resolver(NULL);
/*
* The first thread to call res_init() will setup the global _res
* structure from the async context, not overriding fields set early
* by the user.
*/
_MUTEX_LOCK(&resinit_mutex);
if (!(_res.options & RES_INIT)) {
if (_res.retry == 0)
_res.retry = ac->ac_nsretries;
if (_res.options == 0)
_res.options = ac->ac_options;
if (_res.lookups[0] == '\0')
strlcpy(_res.lookups, ac->ac_db, sizeof(_res.lookups));
for (i = 0; i < ac->ac_nscount && i < MAXNS; i++) {
/*
* No need to check for length since we copy to a
* struct sockaddr_storage with a size of 256 bytes
* and sa_len has only 8 bits.
*/
memcpy(&_res_ext.nsaddr_list[i], ac->ac_ns[i],
ac->ac_ns[i]->sa_len);
if (ac->ac_ns[i]->sa_len <= sizeof(_res.nsaddr_list[i]))
memcpy(&_res.nsaddr_list[i], ac->ac_ns[i],
ac->ac_ns[i]->sa_len);
else
memset(&_res.nsaddr_list[i], 0,
sizeof(_res.nsaddr_list[i]));
}
_res.nscount = i;
_res.options |= RES_INIT;
}
_MUTEX_UNLOCK(&resinit_mutex);
/*
* If the program is not threaded, we want to reflect (some) changes
* made by the user to the global _res structure.
* This is a bit of a hack: if there is already an async query on
* this context, it might change things in its back. It is ok
* as long as the user only uses the blocking resolver API.
* If needed we could consider cloning the context if there is
* a running query.
*/
if (!__isthreaded) {
ac->ac_nsretries = _res.retry;
ac->ac_options = _res.options;
strlcpy(ac->ac_db, _res.lookups, sizeof(ac->ac_db));
ac->ac_dbcount = strlen(ac->ac_db);
}
_asr_ctx_unref(ac);
return (0);
}
