/*
* init_resolve_thread() starts a new thread that performs the actual
* resolve. This function returns before the resolve is done.
*
* Returns FALSE in case of failure, otherwise TRUE.
*/
static bool init_resolve_thread (struct connectdata *conn,
const char *hostname, int port,
const struct addrinfo *hints)
{
struct thread_data *td = calloc(1, sizeof(struct thread_data));
int err = ENOMEM;
conn->async.os_specific = (void*) td;
if(!td)
goto err_exit;
conn->async.port = port;
conn->async.done = FALSE;
conn->async.status = 0;
conn->async.dns = NULL;
td->dummy_sock = CURL_SOCKET_BAD;
td->thread_hnd = curl_thread_t_null;
if (!init_thread_sync_data(&td->tsd, hostname, port, hints))
goto err_exit;
Curl_safefree(conn->async.hostname);
conn->async.hostname = strdup(hostname);
if(!conn->async.hostname)
goto err_exit;
#ifdef WIN32
/* This socket is only to keep Curl_resolv_fdset() and select() happy;
* should never become signalled for read since it's unbound but
* Windows needs at least 1 socket in select().
*/
td->dummy_sock = socket(AF_INET, SOCK_DGRAM, 0);
if (td->dummy_sock == CURL_SOCKET_BAD)
goto err_exit;
#endif
#ifdef HAVE_GETADDRINFO
td->thread_hnd = Curl_thread_create(getaddrinfo_thread, &td->tsd);
#else
td->thread_hnd = Curl_thread_create(gethostbyname_thread, &td->tsd);
#endif
if(!td->thread_hnd) {
#ifndef _WIN32_WCE
err = errno;
#endif
goto err_exit;
}
return TRUE;
err_exit:
Curl_destroy_thread_data(&conn->async);
SET_ERRNO(err);
return FALSE;
}
/*
* 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_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)
{
*entry = NULL;
if (conn->async.done) {
/* we're done */
Curl_destroy_thread_data(&conn->async);
if (!conn->async.dns) {
TRACE(("Curl_is_resolved(): CURLE_COULDNT_RESOLVE_HOST\n"));
return CURLE_COULDNT_RESOLVE_HOST;
}
*entry = conn->async.dns;
TRACE(("resolved okay, dns %p\n", *entry));
}
return CURLE_OK;
}
/*
* 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;
*entry = NULL;
if(conn->async.done) {
/* we're done */
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;
}
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_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;
long timeout;
DWORD status, ticks;
CURLcode rc;
DEBUGASSERT(conn && td);
/* now, see if there's a connect timeout or a regular timeout to
use instead of the default one */
timeout =
conn->data->set.connecttimeout ? conn->data->set.connecttimeout :
conn->data->set.timeout ? conn->data->set.timeout :
CURL_TIMEOUT_RESOLVE * 1000; /* default name resolve timeout */
ticks = GetTickCount();
/* wait for the thread to resolve the name */
status = WaitForSingleObject(td->event_resolved, timeout);
/* mark that we are now done waiting */
ReleaseMutex(td->mutex_waiting);
/* close our handle to the mutex, no point in hanging on to it */
CloseHandle(td->mutex_waiting);
td->mutex_waiting = NULL;
/* close the event handle, it's useless now */
CloseHandle(td->event_resolved);
td->event_resolved = NULL;
/* has the resolver thread succeeded in resolving our query ? */
if (status == WAIT_OBJECT_0) {
/* wait for the thread to exit, it's in the callback sequence */
if (WaitForSingleObject(td->thread_hnd, 5000) == WAIT_TIMEOUT) {
TerminateThread(td->thread_hnd, 0);
conn->async.done = TRUE;
td->thread_status = (DWORD)-1;
TRACE(("%s() thread stuck?!, ", THREAD_NAME));
}
else {
/* Thread finished before timeout; propagate Winsock error to this
* thread. 'conn->async.done = TRUE' is set in
* Curl_addrinfo4/6_callback().
*/
SET_SOCKERRNO(conn->async.status);
GetExitCodeThread(td->thread_hnd, &td->thread_status);
TRACE(("%s() status %lu, thread retval %lu, ",
THREAD_NAME, status, td->thread_status));
}
}
else {
conn->async.done = TRUE;
td->thread_status = (DWORD)-1;
TRACE(("%s() timeout, ", THREAD_NAME));
}
TRACE(("elapsed %lu ms\n", GetTickCount()-ticks));
if(entry)
*entry = conn->async.dns;
rc = CURLE_OK;
if (!conn->async.dns) {
/* a name was not resolved */
if (td->thread_status == CURLE_OUT_OF_MEMORY) {
rc = CURLE_OUT_OF_MEMORY;
failf(data, "Could not resolve host: %s", curl_easy_strerror(rc));
}
else if(conn->async.done) {
if(conn->bits.httpproxy) {
failf(data, "Could not resolve proxy: %s; %s",
conn->proxy.dispname, Curl_strerror(conn, conn->async.status));
rc = CURLE_COULDNT_RESOLVE_PROXY;
}
else {
failf(data, "Could not resolve host: %s; %s",
conn->host.name, Curl_strerror(conn, conn->async.status));
rc = CURLE_COULDNT_RESOLVE_HOST;
}
}
else if (td->thread_status == (DWORD)-1 || conn->async.status == NO_DATA) {
failf(data, "Resolving host timed out: %s", conn->host.name);
rc = CURLE_OPERATION_TIMEDOUT;
}
else
rc = CURLE_OPERATION_TIMEDOUT;
}
Curl_destroy_thread_data(&conn->async);
if(!conn->async.dns)
conn->bits.close = TRUE;
return (rc);
}
/*
* init_resolve_thread() starts a new thread that performs the actual
* resolve. This function returns before the resolve is done.
*
* Returns FALSE in case of failure, otherwise TRUE.
*/
static bool init_resolve_thread (struct connectdata *conn,
const char *hostname, int port,
const Curl_addrinfo *hints)
{
struct thread_data *td = calloc(sizeof(*td), 1);
HANDLE thread_and_event[2] = {0};
if (!td) {
SET_ERRNO(ENOMEM);
return FALSE;
}
Curl_safefree(conn->async.hostname);
conn->async.hostname = strdup(hostname);
if (!conn->async.hostname) {
free(td);
SET_ERRNO(ENOMEM);
return FALSE;
}
conn->async.port = port;
conn->async.done = FALSE;
conn->async.status = 0;
conn->async.dns = NULL;
conn->async.os_specific = (void*) td;
td->dummy_sock = CURL_SOCKET_BAD;
/* Create the mutex used to inform the resolver thread that we're
* still waiting, and take initial ownership.
*/
td->mutex_waiting = CreateMutex(NULL, TRUE, NULL);
if (td->mutex_waiting == NULL) {
Curl_destroy_thread_data(&conn->async);
SET_ERRNO(EAGAIN);
return FALSE;
}
/* Create the event that the thread uses to inform us that it's
* done resolving. Do not signal it.
*/
td->event_resolved = CreateEvent(NULL, TRUE, FALSE, NULL);
if (td->event_resolved == NULL) {
Curl_destroy_thread_data(&conn->async);
SET_ERRNO(EAGAIN);
return FALSE;
}
/* Create the mutex used to serialize access to event_terminated
* between us and resolver thread.
*/
td->mutex_terminate = CreateMutex(NULL, FALSE, NULL);
if (td->mutex_terminate == NULL) {
Curl_destroy_thread_data(&conn->async);
SET_ERRNO(EAGAIN);
return FALSE;
}
/* Create the event used to signal thread that it should terminate.
*/
td->event_terminate = CreateEvent(NULL, TRUE, FALSE, NULL);
if (td->event_terminate == NULL) {
Curl_destroy_thread_data(&conn->async);
SET_ERRNO(EAGAIN);
return FALSE;
}
/* Create the event used by thread to inform it has initialized its own data.
*/
td->event_thread_started = CreateEvent(NULL, TRUE, FALSE, NULL);
if (td->event_thread_started == NULL) {
Curl_destroy_thread_data(&conn->async);
SET_ERRNO(EAGAIN);
return FALSE;
}
#ifdef _WIN32_WCE
td->thread_hnd = (HANDLE) CreateThread(NULL, 0,
(LPTHREAD_START_ROUTINE) THREAD_FUNC,
conn, 0, &td->thread_id);
#else
td->thread_hnd = (HANDLE) _beginthreadex(NULL, 0, THREAD_FUNC,
conn, 0, &td->thread_id);
#endif
#ifdef CURLRES_IPV6
DEBUGASSERT(hints);
td->hints = *hints;
#else
(void) hints;
#endif
if (!td->thread_hnd) {
#ifdef _WIN32_WCE
TRACE(("CreateThread() failed; %s\n", Curl_strerror(conn, ERRNO)));
#else
SET_ERRNO(errno);
TRACE(("_beginthreadex() failed; %s\n", Curl_strerror(conn, ERRNO)));
#endif
Curl_destroy_thread_data(&conn->async);
return FALSE;
}
/* Waiting until the thread will initialize its data or it will exit due errors.
*/
thread_and_event[0] = td->thread_hnd;
thread_and_event[1] = td->event_thread_started;
if (WaitForMultipleObjects(sizeof(thread_and_event) /
sizeof(thread_and_event[0]),
(const HANDLE*)thread_and_event, FALSE,
INFINITE) == WAIT_FAILED) {
/* The resolver thread has been created,
* most probably it works now - ignoring this "minor" error
*/
}
/* This socket is only to keep Curl_resolv_fdset() and select() happy;
* should never become signalled for read/write since it's unbound but
* Windows needs atleast 1 socket in select().
*/
td->dummy_sock = socket(AF_INET, SOCK_DGRAM, 0);
return TRUE;
}
/*
* init_resolve_thread() starts a new thread that performs the actual
* resolve. This function returns before the resolve is done.
*
* Returns FALSE in case of failure, otherwise TRUE.
*/
static bool init_resolve_thread (struct connectdata *conn,
const char *hostname, int port,
const Curl_addrinfo *hints)
{
struct thread_data *td = calloc(sizeof(*td), 1);
if (!td) {
SetLastError(ENOMEM);
return FALSE;
}
Curl_safefree(conn->async.hostname);
conn->async.hostname = strdup(hostname);
if (!conn->async.hostname) {
free(td);
SetLastError(ENOMEM);
return FALSE;
}
conn->async.port = port;
conn->async.done = FALSE;
conn->async.status = 0;
conn->async.dns = NULL;
conn->async.os_specific = (void*) td;
td->dummy_sock = CURL_SOCKET_BAD;
/* Create the mutex used to inform the resolver thread that we're
* still waiting, and take initial ownership.
*/
td->mutex_waiting = CreateMutex(NULL, TRUE, NULL);
if (td->mutex_waiting == NULL) {
Curl_destroy_thread_data(&conn->async);
SetLastError(EAGAIN);
return FALSE;
}
/* Create the event that the thread uses to inform us that it's
* done resolving. Do not signal it.
*/
td->event_resolved = CreateEvent(NULL, TRUE, FALSE, NULL);
if (td->event_resolved == NULL) {
Curl_destroy_thread_data(&conn->async);
SetLastError(EAGAIN);
return FALSE;
}
td->stderr_file = stderr;
#ifdef _WIN32_WCE
td->thread_hnd = (HANDLE) CreateThread(NULL, 0,
(LPTHREAD_START_ROUTINE) THREAD_FUNC,
conn, 0, &td->thread_id);
#else
td->thread_hnd = (HANDLE) _beginthreadex(NULL, 0, THREAD_FUNC,
conn, 0, &td->thread_id);
#endif
#ifdef CURLRES_IPV6
curlassert(hints);
td->hints = *hints;
#else
(void) hints;
#endif
if (!td->thread_hnd) {
SetLastError(errno);
TRACE(("_beginthreadex() failed; %s\n", Curl_strerror(conn,errno)));
Curl_destroy_thread_data(&conn->async);
return FALSE;
}
/* This socket is only to keep Curl_resolv_fdset() and select() happy;
* should never become signalled for read/write since it's unbound but
* Windows needs atleast 1 socket in select().
*/
td->dummy_sock = socket(AF_INET, SOCK_DGRAM, 0);
return TRUE;
}
