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curl/lib/hostthre.c

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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2009, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* $Id$
***************************************************************************/
#include "setup.h"
#include <string.h>
#include <errno.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h> /* required for free() prototypes */
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h> /* for the close() proto */
#endif
#ifdef VMS
#include <in.h>
#include <inet.h>
#include <stdlib.h>
#endif
#ifdef HAVE_PROCESS_H
#include <process.h>
#endif
#if (defined(NETWARE) && defined(__NOVELL_LIBC__))
#undef in_addr_t
#define in_addr_t unsigned long
#endif
#include "urldata.h"
#include "sendf.h"
#include "hostip.h"
#include "hash.h"
#include "share.h"
#include "strerror.h"
#include "url.h"
#include "multiif.h"
#include "inet_pton.h"
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
#include "inet_ntop.h"
#include "curl_memory.h"
/* The last #include file should be: */
#include "memdebug.h"
#if defined(_MSC_VER) && defined(CURL_NO__BEGINTHREADEX)
#pragma message ("No _beginthreadex() available in this RTL")
#endif
/***********************************************************************
* Only for Windows threaded name resolves builds
**********************************************************************/
#ifdef CURLRES_THREADED
/* This function is used to init a threaded resolve */
static bool init_resolve_thread(struct connectdata *conn,
const char *hostname, int port,
const struct addrinfo *hints);
#ifdef CURLRES_IPV4
#define THREAD_FUNC gethostbyname_thread
#define THREAD_NAME "gethostbyname_thread"
#else
#define THREAD_FUNC getaddrinfo_thread
#define THREAD_NAME "getaddrinfo_thread"
#endif
struct thread_data {
HANDLE thread_hnd;
unsigned thread_id;
DWORD thread_status;
curl_socket_t dummy_sock; /* dummy for Curl_resolv_fdset() */
HANDLE mutex_waiting; /* marks that we are still waiting for a resolve */
HANDLE event_resolved; /* marks that the thread obtained the information */
HANDLE event_thread_started; /* marks that the thread has initialized and
started */
HANDLE mutex_terminate; /* serializes access to flag_terminate */
HANDLE event_terminate; /* flag for thread to terminate instead of calling
callbacks */
#ifdef CURLRES_IPV6
struct addrinfo hints;
#endif
};
/* Data for synchronization between resolver thread and its parent */
struct thread_sync_data {
HANDLE mutex_waiting; /* thread_data.mutex_waiting duplicate */
HANDLE mutex_terminate; /* thread_data.mutex_terminate duplicate */
HANDLE event_terminate; /* thread_data.event_terminate duplicate */
char * hostname; /* hostname to resolve, Curl_async.hostname
duplicate */
};
/* Destroy resolver thread synchronization data */
static
void destroy_thread_sync_data(struct thread_sync_data * tsd)
{
if(tsd->hostname)
free(tsd->hostname);
if(tsd->event_terminate)
CloseHandle(tsd->event_terminate);
if(tsd->mutex_terminate)
CloseHandle(tsd->mutex_terminate);
if(tsd->mutex_waiting)
CloseHandle(tsd->mutex_waiting);
memset(tsd,0,sizeof(*tsd));
}
/* Initialize resolver thread synchronization data */
static
BOOL init_thread_sync_data(struct thread_data * td,
const char * hostname,
struct thread_sync_data * tsd)
{
HANDLE curr_proc = GetCurrentProcess();
memset(tsd, 0, sizeof(*tsd));
if(!DuplicateHandle(curr_proc, td->mutex_waiting,
curr_proc, &tsd->mutex_waiting, 0, FALSE,
DUPLICATE_SAME_ACCESS)) {
/* failed to duplicate the mutex, no point in continuing */
destroy_thread_sync_data(tsd);
return FALSE;
}
if(!DuplicateHandle(curr_proc, td->mutex_terminate,
curr_proc, &tsd->mutex_terminate, 0, FALSE,
DUPLICATE_SAME_ACCESS)) {
/* failed to duplicate the mutex, no point in continuing */
destroy_thread_sync_data(tsd);
return FALSE;
}
if(!DuplicateHandle(curr_proc, td->event_terminate,
curr_proc, &tsd->event_terminate, 0, FALSE,
DUPLICATE_SAME_ACCESS)) {
/* failed to duplicate the event, no point in continuing */
destroy_thread_sync_data(tsd);
return FALSE;
}
/* Copying hostname string because original can be destroyed by parent
* thread during gethostbyname execution.
*/
tsd->hostname = strdup(hostname);
if(!tsd->hostname) {
/* Memory allocation failed */
destroy_thread_sync_data(tsd);
return FALSE;
}
return TRUE;
}
/* acquire resolver thread synchronization */
static
BOOL acquire_thread_sync(struct thread_sync_data * tsd)
{
/* is the thread initiator still waiting for us ? */
if(WaitForSingleObject(tsd->mutex_waiting, 0) == WAIT_TIMEOUT) {
/* yes, it is */
/* Waiting access to event_terminate */
if(WaitForSingleObject(tsd->mutex_terminate, INFINITE) != WAIT_OBJECT_0) {
/* Something went wrong - now just ignoring */
}
else {
if(WaitForSingleObject(tsd->event_terminate, 0) != WAIT_TIMEOUT) {
/* Parent thread signaled us to terminate.
* This means that all data in conn->async is now destroyed
* and we cannot use it.
*/
}
else {
return TRUE;
}
}
}
return FALSE;
}
/* release resolver thread synchronization */
static
void release_thread_sync(struct thread_sync_data * tsd)
{
ReleaseMutex(tsd->mutex_terminate);
}
#if defined(CURLRES_IPV4)
/*
* gethostbyname_thread() resolves a name, calls the Curl_addrinfo4_callback
* and then exits.
*
* For builds without ARES/ENABLE_IPV6, create a resolver thread and wait on
* it.
*/
static unsigned __stdcall gethostbyname_thread (void *arg)
{
struct connectdata *conn = (struct connectdata*) arg;
struct thread_data *td = (struct thread_data*) conn->async.os_specific;
struct hostent *he;
int rc = 0;
/* Duplicate the passed mutex and event handles.
* This allows us to use it even after the container gets destroyed
* due to a resolver timeout.
*/
struct thread_sync_data tsd = { 0,0,0,NULL };
if(!init_thread_sync_data(td, conn->async.hostname, &tsd)) {
/* thread synchronization data initialization failed */
return (unsigned)-1;
}
conn->async.status = NO_DATA; /* pending status */
SET_SOCKERRNO(conn->async.status);
/* Signaling that we have initialized all copies of data and handles we
need */
SetEvent(td->event_thread_started);
he = gethostbyname (tsd.hostname);
/* is parent thread waiting for us and are we able to access conn members? */
if(acquire_thread_sync(&tsd)) {
/* Mark that we have obtained the information, and that we are calling
* back with it. */
SetEvent(td->event_resolved);
if(he) {
rc = Curl_addrinfo4_callback(conn, CURL_ASYNC_SUCCESS, he);
}
else {
rc = Curl_addrinfo4_callback(conn, SOCKERRNO, NULL);
}
release_thread_sync(&tsd);
}
/* clean up */
destroy_thread_sync_data(&tsd);
return (rc);
/* An implicit _endthreadex() here */
}
#elif defined(CURLRES_IPV6)
/*
* getaddrinfo_thread() resolves a name, calls Curl_addrinfo6_callback and then
* exits.
*
* For builds without ARES, but with ENABLE_IPV6, create a resolver thread
* and wait on it.
*/
static unsigned __stdcall getaddrinfo_thread (void *arg)
{
struct connectdata *conn = (struct connectdata*) arg;
struct thread_data *td = (struct thread_data*) conn->async.os_specific;
Curl_addrinfo *res;
char service [NI_MAXSERV];
int rc;
struct addrinfo hints = td->hints;
/* Duplicate the passed mutex handle.
* This allows us to use it even after the container gets destroyed
* due to a resolver timeout.
*/
struct thread_sync_data tsd = { 0,0,0,NULL };
if(!init_thread_sync_data(td, conn->async.hostname, &tsd)) {
/* thread synchronization data initialization failed */
return -1;
}
itoa(conn->async.port, service, 10);
conn->async.status = NO_DATA; /* pending status */
SET_SOCKERRNO(conn->async.status);
/* Signaling that we have initialized all copies of data and handles we
need */
SetEvent(td->event_thread_started);
rc = Curl_getaddrinfo_ex(tsd.hostname, service, &hints, &res);
/* is parent thread waiting for us and are we able to access conn members? */
if(acquire_thread_sync(&tsd)) {
/* Mark that we have obtained the information, and that we are calling
back with it. */
SetEvent(td->event_resolved);
if(rc == 0) {
rc = Curl_addrinfo6_callback(conn, CURL_ASYNC_SUCCESS, res);
}
else {
rc = Curl_addrinfo6_callback(conn, SOCKERRNO, NULL);
}
release_thread_sync(&tsd);
}
/* clean up */
destroy_thread_sync_data(&tsd);
return (rc);
/* An implicit _endthreadex() here */
}
#endif
/*
* Curl_destroy_thread_data() cleans up async resolver data and thread handle.
* Complementary of ares_destroy.
*/
void Curl_destroy_thread_data (struct Curl_async *async)
{
if(async->hostname)
free(async->hostname);
if(async->os_specific) {
struct thread_data *td = (struct thread_data*) async->os_specific;
curl_socket_t sock = td->dummy_sock;
if(td->mutex_terminate && td->event_terminate) {
/* Signaling resolver thread to terminate */
if(WaitForSingleObject(td->mutex_terminate, INFINITE) == WAIT_OBJECT_0) {
SetEvent(td->event_terminate);
ReleaseMutex(td->mutex_terminate);
}
else {
/* Something went wrong - just ignoring it */
}
}
if(td->mutex_terminate)
CloseHandle(td->mutex_terminate);
if(td->event_terminate)
CloseHandle(td->event_terminate);
if(td->event_thread_started)
CloseHandle(td->event_thread_started);
if(sock != CURL_SOCKET_BAD)
sclose(sock);
/* destroy the synchronization objects */
if(td->mutex_waiting)
CloseHandle(td->mutex_waiting);
td->mutex_waiting = NULL;
if(td->event_resolved)
CloseHandle(td->event_resolved);
if(td->thread_hnd)
CloseHandle(td->thread_hnd);
free(async->os_specific);
}
async->hostname = NULL;
async->os_specific = NULL;
}
/*
* 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));
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) {
#ifndef _WIN32_WCE
SET_ERRNO(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;
}
/*
* 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;
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 */
/* 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;
}
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);
}
}
else {
conn->async.done = TRUE;
td->thread_status = (DWORD)-1;
}
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);
}
/*
* 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;
}
int Curl_resolv_getsock(struct connectdata *conn,
curl_socket_t *socks,
int numsocks)
{
const struct thread_data *td =
(const struct thread_data *) conn->async.os_specific;
if(td && td->dummy_sock != CURL_SOCKET_BAD) {
if(numsocks) {
/* return one socket waiting for writable, even though this is just
a dummy */
socks[0] = td->dummy_sock;
return GETSOCK_WRITESOCK(0);
}
}
return 0;
}
#ifdef CURLRES_IPV4
/*
* Curl_getaddrinfo() - for Windows threading without ENABLE_IPV6.
*/
Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
const char *hostname,
int port,
int *waitp)
{
struct hostent *h = NULL;
struct SessionHandle *data = conn->data;
struct in_addr in;
*waitp = 0; /* don't wait, we act synchronously */
if(Curl_inet_pton(AF_INET, hostname, &in) > 0)
/* This is a dotted IP address 123.123.123.123-style */
return Curl_ip2addr(AF_INET, &in, hostname, port);
/* fire up a new resolver thread! */
if(init_resolve_thread(conn, hostname, port, NULL)) {
*waitp = TRUE; /* please wait for the response */
return NULL;
}
/* fall-back to blocking version */
infof(data, "init_resolve_thread() failed for %s; %s\n",
hostname, Curl_strerror(conn, ERRNO));
h = gethostbyname(hostname);
if(!h) {
infof(data, "gethostbyname(2) failed for %s:%d; %s\n",
hostname, port, Curl_strerror(conn, SOCKERRNO));
return NULL;
}
return Curl_he2ai(h, port);
}
#endif /* CURLRES_IPV4 */
#ifdef CURLRES_IPV6
/*
* Curl_getaddrinfo() - for Windows threading IPv6 enabled
*/
Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
const char *hostname,
int port,
int *waitp)
{
struct addrinfo hints;
Curl_addrinfo *res;
int error;
char sbuf[NI_MAXSERV];
int pf;
struct SessionHandle *data = conn->data;
*waitp = FALSE; /* default to synch response */
/*
* Check if a limited name resolve has been requested.
*/
switch(data->set.ip_version) {
case CURL_IPRESOLVE_V4:
pf = PF_INET;
break;
case CURL_IPRESOLVE_V6:
pf = PF_INET6;
break;
default:
pf = PF_UNSPEC;
break;
}
if (pf != PF_INET) {
/* see if we have an IPv6 stack */
curl_socket_t s = socket(PF_INET6, SOCK_DGRAM, 0);
if(s == CURL_SOCKET_BAD) {
/* Some non-IPv6 stacks have been found to make very slow name resolves
* when PF_UNSPEC is used, so thus we switch to a mere PF_INET lookup if
* the stack seems to be a non-ipv6 one. */
pf = PF_INET;
}
else {
/* This seems to be an IPv6-capable stack, use PF_UNSPEC for the widest
* possible checks. And close the socket again.
*/
sclose(s);
}
}
memset(&hints, 0, sizeof(hints));
hints.ai_family = pf;
hints.ai_socktype = conn->socktype;
#if 0 /* removed nov 8 2005 before 7.15.1 */
hints.ai_flags = AI_CANONNAME;
#endif
itoa(port, sbuf, 10);
/* fire up a new resolver thread! */
if(init_resolve_thread(conn, hostname, port, &hints)) {
*waitp = TRUE; /* please wait for the response */
return NULL;
}
/* fall-back to blocking version */
infof(data, "init_resolve_thread() failed for %s; %s\n",
hostname, Curl_strerror(conn, ERRNO));
error = Curl_getaddrinfo_ex(hostname, sbuf, &hints, &res);
if(error) {
infof(data, "getaddrinfo() failed for %s:%d; %s\n",
hostname, port, Curl_strerror(conn, SOCKERRNO));
return NULL;
}
return res;
}
#endif /* CURLRES_IPV6 */
#endif /* CURLRES_THREADED */
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