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Code Issues Releases Wiki Activity

Constantine Sapuntzakis threaded resolver enhancements

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This commit is contained in:
Yang Tse 2010-01-25 23:50:13 +00:00
parent c054b8bfa7
commit 483ff1ca75
5 changed files with 290 additions and 437 deletions
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5
lib/hostares.c
View File

@ -350,7 +350,8 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
#ifdef ENABLE_IPV6 /* CURLRES_IPV6 */ #ifdef ENABLE_IPV6 /* CURLRES_IPV6 */
struct in6_addr in6; struct in6_addr in6;
#endif /* CURLRES_IPV6 */ #endif /* CURLRES_IPV6 */
*waitp = FALSE;
*waitp = 0; /* default to synchronous response */
/* First check if this is an IPv4 address string */ /* First check if this is an IPv4 address string */
if(Curl_inet_pton(AF_INET, hostname, &in) > 0) { if(Curl_inet_pton(AF_INET, hostname, &in) > 0) {
@ -396,7 +397,7 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
ares_gethostbyname(data->state.areschannel, hostname, family, ares_gethostbyname(data->state.areschannel, hostname, family,
(ares_host_callback)ares_query_completed_cb, conn); (ares_host_callback)ares_query_completed_cb, conn);
*waitp = TRUE; /* please wait for the response */ *waitp = 1; /* expect asynchronous response */
} }
return NULL; /* no struct yet */ return NULL; /* no struct yet */
} }

9
lib/hostip.h
View File

@ -1,5 +1,5 @@
#ifndef __HOSTIP_H #ifndef HEADER_CURL_HOSTIP_H
#define __HOSTIP_H #define HEADER_CURL_HOSTIP_H
/*************************************************************************** /***************************************************************************
* _ _ ____ _ * _ _ ____ _
* Project ___| | | | _ \| | * Project ___| | | | _ \| |
@ -165,6 +165,9 @@ int curl_dogetnameinfo(GETNAMEINFO_QUAL_ARG1 GETNAMEINFO_TYPE_ARG1 sa,
int line, const char *source); int line, const char *source);
#endif #endif
/* IPv4 threadsafe resolve function used for synch and asynch builds */
Curl_addrinfo *Curl_ipv4_resolve_r(const char * hostname, int port);
/* /*
* Curl_addrinfo_callback() is used when we build with any asynch specialty. * Curl_addrinfo_callback() is used when we build with any asynch specialty.
* Handles end of async request processing. Inserts ai into hostcache when * Handles end of async request processing. Inserts ai into hostcache when
@ -214,4 +217,4 @@ void Curl_destroy_thread_data(struct Curl_async *async);
extern sigjmp_buf curl_jmpenv; extern sigjmp_buf curl_jmpenv;
#endif #endif
#endif #endif /* HEADER_CURL_HOSTIP_H */

64
lib/hostip4.c
View File

@ -5,7 +5,7 @@
* | (__| |_| | _ <| |___ * | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____| * \___|\___/|_| \_\_____|
* *
* Copyright (C) 1998 - 2009, Daniel Stenberg, <daniel@haxx.se>, et al. * Copyright (C) 1998 - 2010, Daniel Stenberg, <daniel@haxx.se>, et al.
* *
* This software is licensed as described in the file COPYING, which * This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms * you should have received as part of this distribution. The terms
@ -87,8 +87,7 @@ bool Curl_ipvalid(struct SessionHandle *data)
return TRUE; /* OK, proceed */ return TRUE; /* OK, proceed */
} }
#ifdef CURLRES_SYNCH /* the functions below are for synchronous resolves */ #ifdef CURLRES_SYNCH
/* /*
* Curl_getaddrinfo() - the ipv4 synchronous version. * Curl_getaddrinfo() - the ipv4 synchronous version.
* *
@ -109,6 +108,33 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
const char *hostname, const char *hostname,
int port, int port,
int *waitp) int *waitp)
{
Curl_addrinfo *ai = NULL;
#ifdef CURL_DISABLE_VERBOSE_STRINGS
(void)conn;
#endif
*waitp = 0; /* synchronous response only */
ai = Curl_ipv4_resolve_r(hostname, port);
if(!ai)
infof(conn->data, "Curl_ipv4_resolve_r failed for %s\n", hostname);
return ai;
}
#endif /* CURLRES_SYNCH */
#endif /* CURLRES_IPV4 */
/*
* Curl_ipv4_resolve_r() - ipv4 threadsafe resolver function.
*
* This is used for both synchronous and asynchronous resolver builds,
* implying that only threadsafe code and function calls may be used.
*
*/
Curl_addrinfo *Curl_ipv4_resolve_r(const char *hostname,
int port)
{ {
#if defined(HAVE_GETHOSTBYNAME_R_3) #if defined(HAVE_GETHOSTBYNAME_R_3)
int res; int res;
@ -118,17 +144,28 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
struct in_addr in; struct in_addr in;
struct hostent *buf = NULL; struct hostent *buf = NULL;
#ifdef CURL_DISABLE_VERBOSE_STRINGS
(void)conn;
#endif
*waitp = 0; /* don't wait, we act synchronously */
if(Curl_inet_pton(AF_INET, hostname, &in) > 0) if(Curl_inet_pton(AF_INET, hostname, &in) > 0)
/* This is a dotted IP address 123.123.123.123-style */ /* This is a dotted IP address 123.123.123.123-style */
return Curl_ip2addr(AF_INET, &in, hostname, port); return Curl_ip2addr(AF_INET, &in, hostname, port);
#if defined(HAVE_GETHOSTBYNAME_R) #if defined(HAVE_GETADDRINFO_THREADSAFE)
else {
struct addrinfo hints;
char sbuf[NI_MAXSERV];
char *sbufptr = NULL;
int error;
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_INET;
hints.ai_socktype = SOCK_STREAM;
if (port) {
snprintf(sbuf, sizeof(sbuf), "%d", port);
sbufptr = sbuf;
}
hints.ai_flags = AI_CANONNAME;
error = Curl_getaddrinfo_ex(hostname, sbufptr, &hints, &ai);
#elif defined(HAVE_GETHOSTBYNAME_R)
/* /*
* gethostbyname_r() is the preferred resolve function for many platforms. * gethostbyname_r() is the preferred resolve function for many platforms.
* Since there are three different versions of it, the following code is * Since there are three different versions of it, the following code is
@ -261,7 +298,6 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
else else
#endif /* HAVE_GETHOSTBYNAME_R_3 */ #endif /* HAVE_GETHOSTBYNAME_R_3 */
{ {
infof(conn->data, "gethostbyname_r(2) failed for %s\n", hostname);
h = NULL; /* set return code to NULL */ h = NULL; /* set return code to NULL */
free(buf); free(buf);
} }
@ -276,8 +312,6 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
#else #else
h = gethostbyname(hostname); h = gethostbyname(hostname);
#endif #endif
if(!h)
infof(conn->data, "gethostbyname(2) failed for %s\n", hostname);
#endif /*HAVE_GETHOSTBYNAME_R */ #endif /*HAVE_GETHOSTBYNAME_R */
} }
@ -290,7 +324,3 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
return ai; return ai;
} }
#endif /* CURLRES_SYNCH */
#endif /* CURLRES_IPV4 */

6
lib/hostip6.c
View File

@ -126,7 +126,7 @@ bool Curl_ipvalid(struct SessionHandle *data)
return TRUE; return TRUE;
} }
#if !defined(USE_THREADING_GETADDRINFO) && !defined(CURLRES_ARES) #if defined(CURLRES_SYNCH)
#ifdef DEBUG_ADDRINFO #ifdef DEBUG_ADDRINFO
static void dump_addrinfo(struct connectdata *conn, const Curl_addrinfo *ai) static void dump_addrinfo(struct connectdata *conn, const Curl_addrinfo *ai)
@ -170,7 +170,7 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
int pf; int pf;
struct SessionHandle *data = conn->data; struct SessionHandle *data = conn->data;
*waitp=0; /* don't wait, we have the response now */ *waitp = 0; /* synchronous response only */
/* /*
* Check if a limited name resolve has been requested. * Check if a limited name resolve has been requested.
@ -234,6 +234,6 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
return res; return res;
} }
#endif /* !USE_THREADING_GETADDRINFO && !CURLRES_ARES */ #endif /* CURLRES_SYNCH */
#endif /* CURLRES_IPV6 */ #endif /* CURLRES_IPV6 */

631
lib/hostthre.c
View File

@ -50,9 +50,15 @@
#include <stdlib.h> #include <stdlib.h>
#endif #endif
#if defined(USE_THREADS_POSIX)
# ifdef HAVE_PTHREAD_H
# include <pthread.h>
# endif
#elif defined(USE_THREADS_WIN32)
# ifdef HAVE_PROCESS_H # ifdef HAVE_PROCESS_H
# include <process.h> # include <process.h>
# endif # endif
#endif
#if (defined(NETWARE) && defined(__NOVELL_LIBC__)) #if (defined(NETWARE) && defined(__NOVELL_LIBC__))
#undef in_addr_t #undef in_addr_t
@ -68,12 +74,12 @@
#include "url.h" #include "url.h"
#include "multiif.h" #include "multiif.h"
#include "inet_pton.h" #include "inet_pton.h"
#include "inet_ntop.h"
#include "curl_threads.h"
#define _MPRINTF_REPLACE /* use our functions only */ #define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h> #include <curl/mprintf.h>
#include "inet_ntop.h"
#include "curl_memory.h" #include "curl_memory.h"
/* The last #include file should be: */ /* The last #include file should be: */
#include "memdebug.h" #include "memdebug.h"
@ -83,7 +89,7 @@
#endif #endif
/*********************************************************************** /***********************************************************************
* Only for Windows threaded name resolves builds * Only for threaded name resolves builds
**********************************************************************/ **********************************************************************/
#ifdef CURLRES_THREADED #ifdef CURLRES_THREADED
@ -92,251 +98,162 @@ static bool init_resolve_thread(struct connectdata *conn,
const char *hostname, int port, const char *hostname, int port,
const struct addrinfo *hints); 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 { /* Data for synchronization between resolver thread and its parent */
HANDLE thread_hnd; struct thread_sync_data {
unsigned thread_id; curl_mutex_t * mtx;
DWORD thread_status; int done;
curl_socket_t dummy_sock; /* dummy for Curl_resolv_fdset() */
HANDLE mutex_waiting; /* marks that we are still waiting for a resolve */ char * hostname; /* hostname to resolve, Curl_async.hostname
HANDLE event_resolved; /* marks that the thread obtained the information */ duplicate */
HANDLE event_thread_started; /* marks that the thread has initialized and int port;
started */ int sock_error;
HANDLE mutex_terminate; /* serializes access to flag_terminate */ Curl_addrinfo *res;
HANDLE event_terminate; /* flag for thread to terminate instead of calling #ifdef HAVE_GETADDRINFO
callbacks */
#ifdef CURLRES_IPV6
struct addrinfo hints; struct addrinfo hints;
#endif #endif
}; };
/* Data for synchronization between resolver thread and its parent */ struct thread_data {
struct thread_sync_data { curl_thread_t thread_hnd;
HANDLE mutex_waiting; /* thread_data.mutex_waiting duplicate */ curl_socket_t dummy_sock;
HANDLE mutex_terminate; /* thread_data.mutex_terminate duplicate */ unsigned int poll_interval;
HANDLE event_terminate; /* thread_data.event_terminate duplicate */ int interval_end;
char * hostname; /* hostname to resolve, Curl_async.hostname struct thread_sync_data tsd;
duplicate */
}; };
static struct thread_sync_data * conn_thread_sync_data(struct connectdata *conn)
{
return &(((struct thread_data *)conn->async.os_specific)->tsd);
}
#define CONN_THREAD_SYNC_DATA(conn) &(((conn)->async.os_specific)->tsd);
/* Destroy resolver thread synchronization data */ /* Destroy resolver thread synchronization data */
static static
void destroy_thread_sync_data(struct thread_sync_data * tsd) void destroy_thread_sync_data(struct thread_sync_data * tsd)
{ {
if (tsd->mtx) {
Curl_mutex_destroy(tsd->mtx);
free(tsd->mtx);
}
if(tsd->hostname) if(tsd->hostname)
free(tsd->hostname); free(tsd->hostname);
if(tsd->event_terminate)
CloseHandle(tsd->event_terminate); if (tsd->res)
if(tsd->mutex_terminate) Curl_freeaddrinfo(tsd->res);
CloseHandle(tsd->mutex_terminate);
if(tsd->mutex_waiting)
CloseHandle(tsd->mutex_waiting);
memset(tsd,0,sizeof(*tsd)); memset(tsd,0,sizeof(*tsd));
} }
/* Initialize resolver thread synchronization data */ /* Initialize resolver thread synchronization data */
static static
BOOL init_thread_sync_data(struct thread_data * td, int init_thread_sync_data(struct thread_sync_data * tsd,
const char * hostname, const char * hostname,
struct thread_sync_data * tsd) int port,
const struct addrinfo *hints)
{ {
HANDLE curr_proc = GetCurrentProcess();
memset(tsd, 0, sizeof(*tsd)); memset(tsd, 0, sizeof(*tsd));
if(!DuplicateHandle(curr_proc, td->mutex_waiting,
curr_proc, &tsd->mutex_waiting, 0, FALSE, tsd->port = port;
DUPLICATE_SAME_ACCESS)) { #ifdef CURLRES_IPV6
/* failed to duplicate the mutex, no point in continuing */ DEBUGASSERT(hints);
destroy_thread_sync_data(tsd); tsd->hints = *hints;
return FALSE; #else
} (void) hints;
if(!DuplicateHandle(curr_proc, td->mutex_terminate, #endif
curr_proc, &tsd->mutex_terminate, 0, FALSE,
DUPLICATE_SAME_ACCESS)) { tsd->mtx = malloc(sizeof(curl_mutex_t));
/* failed to duplicate the mutex, no point in continuing */ if (tsd->mtx == NULL) goto err_exit;
destroy_thread_sync_data(tsd);
return FALSE; Curl_mutex_init(tsd->mtx);
}
if(!DuplicateHandle(curr_proc, td->event_terminate, tsd->sock_error = CURL_ASYNC_SUCCESS;
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 /* Copying hostname string because original can be destroyed by parent
* thread during gethostbyname execution. * thread during gethostbyname execution.
*/ */
tsd->hostname = strdup(hostname); tsd->hostname = strdup(hostname);
if(!tsd->hostname) { if (!tsd->hostname) goto err_exit;
return 1;
err_exit:
/* Memory allocation failed */ /* Memory allocation failed */
destroy_thread_sync_data(tsd); destroy_thread_sync_data(tsd);
return FALSE; return 0;
} }
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_addrinfo_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)) {
Curl_addrinfo *ai = Curl_he2ai(he, conn->async.port);
/* Mark that we have obtained the information, and that we are calling
* back with it. */
SetEvent(td->event_resolved);
if(ai) {
rc = Curl_addrinfo_callback(conn, CURL_ASYNC_SUCCESS, ai);
}
else {
rc = Curl_addrinfo_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_addrinfo_callback and then * gethostbyname_thread() resolves a name and then exits.
* exits. */
static unsigned int CURL_STDCALL gethostbyname_thread (void *arg)
{
struct thread_sync_data *tsd = (struct thread_sync_data *)arg;
tsd->res = Curl_ipv4_resolve_r(tsd->hostname, tsd->port);
if (!tsd->res) {
tsd->sock_error = SOCKERRNO;
if (tsd->sock_error == 0)
tsd->sock_error = ENOMEM;
}
Curl_mutex_acquire(tsd->mtx);
tsd->done = 1;
Curl_mutex_release(tsd->mtx);
return 0;
}
static int getaddrinfo_complete(struct connectdata *conn)
{
struct thread_sync_data *tsd = conn_thread_sync_data(conn);
int rc;
rc = Curl_addrinfo_callback(conn, tsd->sock_error, tsd->res);
/* The tsd->res structure has been copied to async.dns and perhaps the DNS cache.
Set our copy to NULL so destroy_thread_sync_data doesn't free it.
*/
tsd->res = NULL;
return rc;
}
#if defined(HAVE_GETADDRINFO)
/*
* getaddrinfo_thread() resolves a name and then exits.
* *
* For builds without ARES, but with ENABLE_IPV6, create a resolver thread * For builds without ARES, but with ENABLE_IPV6, create a resolver thread
* and wait on it. * and wait on it.
*/ */
static unsigned __stdcall getaddrinfo_thread (void *arg) static unsigned int CURL_STDCALL getaddrinfo_thread (void *arg)
{ {
struct connectdata *conn = (struct connectdata*) arg; struct thread_sync_data *tsd = (struct thread_sync_data*)arg;
struct thread_data *td = (struct thread_data*) conn->async.os_specific;
Curl_addrinfo *res;
char service [NI_MAXSERV]; char service [NI_MAXSERV];
int rc; int rc;
struct addrinfo hints = td->hints;
/* Duplicate the passed mutex handle. snprintf(service, sizeof(service), "%d", tsd->port);
* 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)) { rc = Curl_getaddrinfo_ex(tsd->hostname, service, &tsd->hints, &tsd->res);
/* thread synchronization data initialization failed */
return -1; if (rc != 0) {
tsd->sock_error = SOCKERRNO;
if (tsd->sock_error == 0)
tsd->sock_error = ENOMEM;
} }
itoa(conn->async.port, service, 10); Curl_mutex_acquire(tsd->mtx);
tsd->done = 1;
Curl_mutex_release(tsd->mtx);
conn->async.status = NO_DATA; /* pending status */ return 0;
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_addrinfo_callback(conn, CURL_ASYNC_SUCCESS, res);
}
else {
rc = Curl_addrinfo_callback(conn, SOCKERRNO, NULL);
}
release_thread_sync(&tsd);
} }
/* clean up */ #endif /* HAVE_GETADDRINFO */
destroy_thread_sync_data(&tsd);
return (rc);
/* An implicit _endthreadex() here */
}
#endif
/* /*
* Curl_destroy_thread_data() cleans up async resolver data and thread handle. * Curl_destroy_thread_data() cleans up async resolver data and thread handle.
@ -349,38 +266,14 @@ void Curl_destroy_thread_data (struct Curl_async *async)
if(async->os_specific) { if(async->os_specific) {
struct thread_data *td = (struct thread_data*) 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) { if (td->dummy_sock != CURL_SOCKET_BAD)
/* Signaling resolver thread to terminate */ sclose(td->dummy_sock);
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) if (td->thread_hnd != curl_thread_t_null)
CloseHandle(td->mutex_terminate); Curl_thread_join(&td->thread_hnd);
if(td->event_terminate)
CloseHandle(td->event_terminate);
if(td->event_thread_started)
CloseHandle(td->event_thread_started);
if(sock != CURL_SOCKET_BAD) destroy_thread_sync_data(&td->tsd);
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); free(async->os_specific);
} }
@ -399,114 +292,58 @@ static bool init_resolve_thread (struct connectdata *conn,
const struct addrinfo *hints) const struct addrinfo *hints)
{ {
struct thread_data *td = calloc(1, sizeof(struct thread_data)); struct thread_data *td = calloc(1, sizeof(struct thread_data));
HANDLE thread_and_event[2] = {0}; int err = ENOMEM;
if(!td) { conn->async.os_specific = (void*) td;
SET_ERRNO(ENOMEM); if(!td)
return FALSE; goto err_exit;
}
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.port = port;
conn->async.done = FALSE; conn->async.done = FALSE;
conn->async.status = 0; conn->async.status = 0;
conn->async.dns = NULL; conn->async.dns = NULL;
conn->async.os_specific = (void*) td;
td->dummy_sock = CURL_SOCKET_BAD; td->dummy_sock = CURL_SOCKET_BAD;
td->thread_hnd = curl_thread_t_null;
/* Create the mutex used to inform the resolver thread that we're if (!init_thread_sync_data(&td->tsd, hostname, port, hints))
* still waiting, and take initial ownership. goto err_exit;
*/
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 Curl_safefree(conn->async.hostname);
* done resolving. Do not signal it. conn->async.hostname = strdup(hostname);
*/ if(!conn->async.hostname)
td->event_resolved = CreateEvent(NULL, TRUE, FALSE, NULL); goto err_exit;
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 #ifdef WIN32
td->thread_hnd = (HANDLE) CreateThread(NULL, 0, /* This socket is only to keep Curl_resolv_fdset() and select() happy;
(LPTHREAD_START_ROUTINE) THREAD_FUNC, * should never become signalled for read since it's unbound but
conn, 0, &td->thread_id); * Windows needs at least 1 socket in select().
#else */
td->thread_hnd = (HANDLE) _beginthreadex(NULL, 0, THREAD_FUNC, td->dummy_sock = socket(AF_INET, SOCK_DGRAM, 0);
conn, 0, &td->thread_id); if (td->dummy_sock == CURL_SOCKET_BAD)
goto err_exit;
#endif #endif
#ifdef CURLRES_IPV6 #ifdef HAVE_GETADDRINFO
DEBUGASSERT(hints); td->thread_hnd = Curl_thread_create(getaddrinfo_thread, &td->tsd);
td->hints = *hints;
#else #else
(void) hints; td->thread_hnd = Curl_thread_create(gethostbyname_thread, &td->tsd);
#endif #endif
if(!td->thread_hnd) { if(!td->thread_hnd) {
#ifndef _WIN32_WCE #ifndef _WIN32_WCE
SET_ERRNO(errno); err = errno;
#endif #endif
Curl_destroy_thread_data(&conn->async); goto err_exit;
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; return TRUE;
err_exit:
Curl_destroy_thread_data(&conn->async);
SET_ERRNO(err);
return FALSE;
} }
@ -523,85 +360,34 @@ CURLcode Curl_wait_for_resolv(struct connectdata *conn,
{ {
struct thread_data *td = (struct thread_data*) conn->async.os_specific; struct thread_data *td = (struct thread_data*) conn->async.os_specific;
struct SessionHandle *data = conn->data; struct SessionHandle *data = conn->data;
long timeout;
DWORD status;
CURLcode rc; CURLcode rc;
DEBUGASSERT(conn && td); 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 */ /* wait for the thread to resolve the name */
status = WaitForSingleObject(td->event_resolved, timeout); if (Curl_thread_join(&td->thread_hnd)) {
rc = getaddrinfo_complete(conn);
} else {
DEBUGASSERT(0);
}
/* 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; 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) if(entry)
*entry = conn->async.dns; *entry = conn->async.dns;
rc = CURLE_OK;
if(!conn->async.dns) { if(!conn->async.dns) {
/* a name was not resolved */ /* 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) { if (conn->bits.httpproxy) {
failf(data, "Could not resolve proxy: %s; %s", failf(data, "Could not resolve proxy: %s; %s",
conn->proxy.dispname, Curl_strerror(conn, conn->async.status)); conn->async.hostname, Curl_strerror(conn, conn->async.status));
rc = CURLE_COULDNT_RESOLVE_PROXY; rc = CURLE_COULDNT_RESOLVE_PROXY;
} } else {
else {
failf(data, "Could not resolve host: %s; %s", failf(data, "Could not resolve host: %s; %s",
conn->host.name, Curl_strerror(conn, conn->async.status)); conn->async.hostname, Curl_strerror(conn, conn->async.status));
rc = CURLE_COULDNT_RESOLVE_HOST; 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); Curl_destroy_thread_data(&conn->async);
@ -620,19 +406,57 @@ CURLcode Curl_is_resolved(struct connectdata *conn,
struct Curl_dns_entry **entry) struct Curl_dns_entry **entry)
{ {
struct SessionHandle *data = conn->data; struct SessionHandle *data = conn->data;
struct thread_data *td = (struct thread_data*) conn->async.os_specific;
int done = 0;
*entry = NULL; *entry = NULL;
if(conn->async.done) { if (!td) {
/* we're done */ 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); Curl_destroy_thread_data(&conn->async);
if(!conn->async.dns) { if(!conn->async.dns) {
failf(data, "Could not resolve host: %s; %s", failf(data, "Could not resolve host: %s; %s",
conn->host.name, Curl_strerror(conn, conn->async.status)); conn->host.name, Curl_strerror(conn, conn->async.status));
return CURLE_COULDNT_RESOLVE_HOST; return CURLE_COULDNT_RESOLVE_HOST;
} }
*entry = conn->async.dns; *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; return CURLE_OK;
} }
@ -645,18 +469,18 @@ int Curl_resolv_getsock(struct connectdata *conn,
if(td && td->dummy_sock != CURL_SOCKET_BAD) { if(td && td->dummy_sock != CURL_SOCKET_BAD) {
if(numsocks) { if(numsocks) {
/* return one socket waiting for writable, even though this is just /* return one socket waiting for readable, even though this is just
a dummy */ a dummy */
socks[0] = td->dummy_sock; socks[0] = td->dummy_sock;
return GETSOCK_WRITESOCK(0); return GETSOCK_READSOCK(0);
} }
} }
return 0; return 0;
} }
#ifdef CURLRES_IPV4 #if !defined(HAVE_GETADDRINFO)
/* /*
* Curl_getaddrinfo() - for Windows threading without ENABLE_IPV6. * Curl_getaddrinfo() - for platforms without getaddrinfo
*/ */
Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn, Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
const char *hostname, const char *hostname,
@ -667,7 +491,7 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
struct SessionHandle *data = conn->data; struct SessionHandle *data = conn->data;
struct in_addr in; struct in_addr in;
*waitp = 0; /* don't wait, we act synchronously */ *waitp = 0; /* default to synchronous response */
if(Curl_inet_pton(AF_INET, hostname, &in) > 0) if(Curl_inet_pton(AF_INET, hostname, &in) > 0)
/* This is a dotted IP address 123.123.123.123-style */ /* This is a dotted IP address 123.123.123.123-style */
@ -675,27 +499,18 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
/* fire up a new resolver thread! */ /* fire up a new resolver thread! */
if(init_resolve_thread(conn, hostname, port, NULL)) { if(init_resolve_thread(conn, hostname, port, NULL)) {
*waitp = TRUE; /* please wait for the response */ *waitp = 1; /* expect asynchronous response */
return NULL; return NULL;
} }
/* fall-back to blocking version */ /* fall-back to blocking version */
infof(data, "init_resolve_thread() failed for %s; %s\n", return Curl_ipv4_resolve_r(hostname, port);
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 #else /* HAVE_GETADDRINFO */
/* /*
* Curl_getaddrinfo() - for Windows threading IPv6 enabled * Curl_getaddrinfo() - for getaddrinfo
*/ */
Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn, Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
const char *hostname, const char *hostname,
@ -706,11 +521,12 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
Curl_addrinfo *res; Curl_addrinfo *res;
int error; int error;
char sbuf[NI_MAXSERV]; char sbuf[NI_MAXSERV];
int pf; int pf = PF_INET;
struct SessionHandle *data = conn->data; struct SessionHandle *data = conn->data;
*waitp = FALSE; /* default to synch response */ *waitp = 0; /* default to synchronous response */
#if !defined(CURLRES_IPV4)
/* /*
* Check if a limited name resolve has been requested. * Check if a limited name resolve has been requested.
*/ */
@ -743,6 +559,7 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
sclose(s); sclose(s);
} }
} }
#endif /* !CURLRES_IPV4 */
memset(&hints, 0, sizeof(hints)); memset(&hints, 0, sizeof(hints));
hints.ai_family = pf; hints.ai_family = pf;
@ -750,11 +567,11 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
#if 0 /* removed nov 8 2005 before 7.15.1 */ #if 0 /* removed nov 8 2005 before 7.15.1 */
hints.ai_flags = AI_CANONNAME; hints.ai_flags = AI_CANONNAME;
#endif #endif
itoa(port, sbuf, 10); snprintf(sbuf, sizeof(sbuf), "%d", port);
/* fire up a new resolver thread! */ /* fire up a new resolver thread! */
if(init_resolve_thread(conn, hostname, port, &hints)) { if(init_resolve_thread(conn, hostname, port, &hints)) {
*waitp = TRUE; /* please wait for the response */ *waitp = 1; /* expect asynchronous response */
return NULL; return NULL;
} }
@ -770,5 +587,7 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
} }
return res; return res;
} }
#endif /* CURLRES_IPV6 */
#endif /* HAVE_GETADDRINFO */
#endif /* CURLRES_THREADED */ #endif /* CURLRES_THREADED */