/*
* Curl_resolver_wait_resolv()
*
* waits for a resolve to finish. This function should be avoided since using
* this risk getting the multi interface to "hang".
*
* If 'entry' is non-NULL, make it point to the resolved dns entry
*
* This is the version for resolves-in-a-thread.
*/
CURLcode Curl_resolver_wait_resolv(struct connectdata *conn,
struct Curl_dns_entry **entry)
{
struct thread_data *td = (struct thread_data*) conn->async.os_specific;
CURLcode result = CURLE_OK;
DEBUGASSERT(conn && td);
/* wait for the thread to resolve the name */
if(Curl_thread_join(&td->thread_hnd))
result = getaddrinfo_complete(conn);
else
DEBUGASSERT(0);
conn->async.done = TRUE;
if(entry)
*entry = conn->async.dns;
if(!conn->async.dns)
/* a name was not resolved, report error */
result = resolver_error(conn);
destroy_async_data(&conn->async);
if(!conn->async.dns)
connclose(conn, "asynch resolve failed");
return result;
}
/*
* Curl_is_resolved() is called repeatedly to check if a previous name resolve
* request has completed. It should also make sure to time-out if the
* operation seems to take too long.
*/
CURLcode Curl_is_resolved(struct connectdata *conn,
struct Curl_dns_entry **entry)
{
struct SessionHandle *data = conn->data;
struct thread_data *td = (struct thread_data*) conn->async.os_specific;
int done = 0;
*entry = NULL;
if (!td) {
DEBUGASSERT(td);
return CURLE_COULDNT_RESOLVE_HOST;
}
Curl_mutex_acquire(td->tsd.mtx);
done = td->tsd.done;
Curl_mutex_release(td->tsd.mtx);
if (done) {
getaddrinfo_complete(conn);
if (td->poll_interval != 0)
Curl_expire(conn->data, 0);
Curl_destroy_thread_data(&conn->async);
if(!conn->async.dns) {
failf(data, "Could not resolve host: %s; %s",
conn->host.name, Curl_strerror(conn, conn->async.status));
return CURLE_COULDNT_RESOLVE_HOST;
}
*entry = conn->async.dns;
} else {
/* poll for name lookup done with exponential backoff up to 250ms */
int elapsed;
elapsed = Curl_tvdiff(Curl_tvnow(), data->progress.t_startsingle);
if (elapsed < 0) {
elapsed = 0;
}
if (td->poll_interval == 0) {
/* Start at 1ms poll interval */
td->poll_interval = 1;
} else if (elapsed >= td->interval_end) {
/* Back-off exponentially if last interval expired */
td->poll_interval *= 2;
}
if (td->poll_interval > 250)
td->poll_interval = 250;
td->interval_end = elapsed + td->poll_interval;
Curl_expire(conn->data, td->poll_interval);
}
return CURLE_OK;
}
/*
* Curl_resolver_is_resolved() is called repeatedly to check if a previous
* name resolve request has completed. It should also make sure to time-out if
* the operation seems to take too long.
*/
CURLcode Curl_resolver_is_resolved(struct connectdata *conn,
struct Curl_dns_entry **entry)
{
struct Curl_easy *data = conn->data;
struct thread_data *td = (struct thread_data*) conn->async.os_specific;
int done = 0;
*entry = NULL;
if(!td) {
DEBUGASSERT(td);
return CURLE_COULDNT_RESOLVE_HOST;
}
Curl_mutex_acquire(td->tsd.mtx);
done = td->tsd.done;
Curl_mutex_release(td->tsd.mtx);
if(done) {
getaddrinfo_complete(conn);
if(!conn->async.dns) {
CURLcode result = resolver_error(conn);
destroy_async_data(&conn->async);
return result;
}
destroy_async_data(&conn->async);
*entry = conn->async.dns;
}
else {
/* poll for name lookup done with exponential backoff up to 250ms */
timediff_t elapsed = Curl_timediff(Curl_now(),
data->progress.t_startsingle);
if(elapsed < 0)
elapsed = 0;
if(td->poll_interval == 0)
/* Start at 1ms poll interval */
td->poll_interval = 1;
else if(elapsed >= td->interval_end)
/* Back-off exponentially if last interval expired */
td->poll_interval *= 2;
if(td->poll_interval > 250)
td->poll_interval = 250;
td->interval_end = elapsed + td->poll_interval;
Curl_expire(conn->data, td->poll_interval, EXPIRE_ASYNC_NAME);
}
return CURLE_OK;
}
/*
* Curl_wait_for_resolv() waits for a resolve to finish. This function should
* be avoided since using this risk getting the multi interface to "hang".
*
* If 'entry' is non-NULL, make it point to the resolved dns entry
*
* This is the version for resolves-in-a-thread.
*/
CURLcode Curl_wait_for_resolv(struct connectdata *conn,
struct Curl_dns_entry **entry)
{
struct thread_data *td = (struct thread_data*) conn->async.os_specific;
struct SessionHandle *data = conn->data;
CURLcode rc = CURLE_OK;
DEBUGASSERT(conn && td);
/* wait for the thread to resolve the name */
if (Curl_thread_join(&td->thread_hnd)) {
rc = getaddrinfo_complete(conn);
} else {
DEBUGASSERT(0);
}
conn->async.done = TRUE;
if(entry)
*entry = conn->async.dns;
if(!conn->async.dns) {
/* a name was not resolved */
if (conn->bits.httpproxy) {
failf(data, "Could not resolve proxy: %s; %s",
conn->async.hostname, Curl_strerror(conn, conn->async.status));
rc = CURLE_COULDNT_RESOLVE_PROXY;
} else {
failf(data, "Could not resolve host: %s; %s",
conn->async.hostname, Curl_strerror(conn, conn->async.status));
rc = CURLE_COULDNT_RESOLVE_HOST;
}
}
Curl_destroy_thread_data(&conn->async);
if(!conn->async.dns)
conn->bits.close = TRUE;
return (rc);
}
/*
* Curl_resolver_wait_resolv()
*
* waits for a resolve to finish. This function should be avoided since using
* this risk getting the multi interface to "hang".
*
* If 'entry' is non-NULL, make it point to the resolved dns entry
*
* This is the version for resolves-in-a-thread.
*/
CURLcode Curl_resolver_wait_resolv(struct connectdata *conn,
struct Curl_dns_entry **entry)
{
struct thread_data *td = (struct thread_data*) conn->async.os_specific;
CURLcode rc = CURLE_OK;
DEBUGASSERT(conn && td);
/* wait for the thread to resolve the name */
if(Curl_thread_join(&td->thread_hnd))
rc = getaddrinfo_complete(conn);
else
DEBUGASSERT(0);
conn->async.done = TRUE;
if(entry)
*entry = conn->async.dns;
if(!conn->async.dns) {
/* a name was not resolved */
if(conn->bits.httpproxy) {
resolver_error(conn, "proxy");
rc = CURLE_COULDNT_RESOLVE_PROXY;
}
else {
resolver_error(conn, "host");
rc = CURLE_COULDNT_RESOLVE_HOST;
}
}
destroy_async_data(&conn->async);
if(!conn->async.dns)
conn->bits.close = TRUE;
return (rc);
}
