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diff --git a/lib/hostthre.c b/lib/hostthre.c
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+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2004, 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>
+
+#define _REENTRANT
+
+#if defined(WIN32) && !defined(__GNUC__) || defined(__MINGW32__)
+#include <malloc.h>
+#else
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#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
+#endif
+
+#ifdef HAVE_SETJMP_H
+#include <setjmp.h>
+#endif
+
+#ifdef WIN32
+#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"
+
+#define _MPRINTF_REPLACE /* use our functions only */
+#include <curl/mprintf.h>
+
+#if defined(HAVE_INET_NTOA_R) && !defined(HAVE_INET_NTOA_R_DECL)
+#include "inet_ntoa_r.h"
+#endif
+
+/* The last #include file should be: */
+#ifdef CURLDEBUG
+#include "memdebug.h"
+#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 Curl_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
+
+#if defined(DEBUG_THREADING_GETHOSTBYNAME) || \
+ defined(DEBUG_THREADING_GETADDRINFO)
+/* If this is defined, provide tracing */
+#define TRACE(args) \
+ do { trace_it("%u: ", __LINE__); trace_it args; } while (0)
+
+static void trace_it (const char *fmt, ...)
+{
+ static int do_trace = -1;
+ va_list args;
+
+ if (do_trace == -1) {
+ const char *env = getenv("CURL_TRACE");
+ do_trace = (env && atoi(env) > 0);
+ }
+ if (!do_trace)
+ return;
+ va_start (args, fmt);
+ vfprintf (stderr, fmt, args);
+ fflush (stderr);
+ va_end (args);
+}
+#else
+#define TRACE(x)
+#endif
+
+#ifdef DEBUG_THREADING_GETADDRINFO
+
+/* inet_ntop.c */
+extern const char *Curl_inet_ntop (int af, const void *addr, char *buf, size_t size);
+
+static void dump_addrinfo (struct connectdata *conn, const struct addrinfo *ai)
+{
+ TRACE(("dump_addrinfo:\n"));
+ for ( ; ai; ai = ai->ai_next) {
+ char buf [INET6_ADDRSTRLEN];
+ trace_it(" fam %2d, CNAME %s, ",
+ af, ai->ai_canonname ? ai->ai_canonname : "<none>");
+ if (Curl_printable_address(ai->ai_family, ai->ai_addr, buf, sizeof(buf)))
+ trace_it("%s\n", buf);
+ else
+ trace_it("failed; %s\n", Curl_strerror(conn,WSAGetLastError()));
+ }
+}
+#endif
+
+struct thread_data {
+ HANDLE thread_hnd;
+ unsigned thread_id;
+ DWORD thread_status;
+ curl_socket_t dummy_sock; /* dummy for Curl_fdset() */
+ FILE *stderr_file;
+#ifdef CURLRES_IPV6
+ struct addrinfo hints;
+#endif
+};
+
+#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;
+
+ /* Sharing the same _iob[] element with our parent thread should
+ * hopefully make printouts synchronised. I'm not sure it works
+ * with a static runtime lib (MSVC's libc.lib).
+ */
+ *stderr = *td->stderr_file;
+
+ WSASetLastError (conn->async.status = NO_DATA); /* pending status */
+ he = gethostbyname (conn->async.hostname);
+ if (he) {
+ Curl_addrinfo_callback(conn, CURL_ASYNC_SUCCESS, he);
+ rc = 1;
+ }
+ else {
+ Curl_addrinfo_callback(conn, (int)WSAGetLastError(), NULL);
+ rc = 0;
+ }
+ TRACE(("Winsock-error %d, addr %s\n", conn->async.status,
+ he ? inet_ntoa(*(struct in_addr*)he->h_addr) : "unknown"));
+ return (rc);
+ /* An implicit _endthreadex() here */
+}
+
+#elif defined(CURLRES_IPV6)
+
+/*
+ * getaddrinfo_thread() resolves a name, calls Curl_addrinfo_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;
+ struct addrinfo *res;
+ char service [NI_MAXSERV];
+ int rc;
+
+ *stderr = *td->stderr_file;
+
+ itoa(conn->async.port, service, 10);
+
+ WSASetLastError(conn->async.status = NO_DATA); /* pending status */
+
+ rc = getaddrinfo(conn->async.hostname, service, &td->hints, &res);
+
+ if (rc == 0) {
+#ifdef DEBUG_THREADING_GETADDRINFO
+ dump_addrinfo (conn, res);
+#endif
+ Curl_addrinfo_callback(conn, CURL_ASYNC_SUCCESS, res);
+ }
+ else {
+ Curl_addrinfo_callback(conn, (int)WSAGetLastError(), NULL);
+ TRACE(("Winsock-error %d, no address\n", conn->async.status));
+ }
+ return (rc);
+ /* An implicit _endthreadex() here */
+}
+#endif
+
+/*
+ * destroy_thread_data() cleans up async resolver data.
+ * Complementary of ares_destroy.
+ */
+static void destroy_thread_data (struct Curl_async *async)
+{
+ if (async->hostname)
+ free(async->hostname);
+
+ if (async->os_specific) {
+ curl_socket_t sock = ((const struct thread_data*)async->os_specific)->dummy_sock;
+
+ if (sock != CURL_SOCKET_BAD)
+ sclose(sock);
+ 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 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;
+ td->stderr_file = stderr;
+ td->thread_hnd = (HANDLE) _beginthreadex(NULL, 0, THREAD_FUNC,
+ conn, 0, &td->thread_id);
+#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)));
+ destroy_thread_data(&conn->async);
+ return FALSE;
+ }
+ /* This socket is only to keep Curl_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, ticks;
+ CURLcode rc;
+
+ curlassert (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; /* default name resolve timeout */
+ ticks = GetTickCount();
+
+ status = WaitForSingleObject(td->thread_hnd, 1000UL*timeout);
+ if (status == WAIT_OBJECT_0 || status == WAIT_ABANDONED) {
+ /* Thread finished before timeout; propagate Winsock error to this thread.
+ * 'conn->async.done = TRUE' is set in Curl_addrinfo_callback().
+ */
+ WSASetLastError(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));
+
+ CloseHandle(td->thread_hnd);
+
+ if(entry)
+ *entry = conn->async.dns;
+
+ rc = CURLE_OK;
+
+ if (!conn->async.dns) {
+ /* a name was not resolved */
+ if (td->thread_status == (DWORD)-1 || conn->async.status == NO_DATA) {
+ failf(data, "Resolving host timed out: %s", conn->hostname);
+ rc = CURLE_OPERATION_TIMEDOUT;
+ }
+ else if(conn->async.done) {
+ failf(data, "Could not resolve host: %s; %s",
+ conn->hostname, Curl_strerror(conn,conn->async.status));
+ rc = CURLE_COULDNT_RESOLVE_HOST;
+ }
+ else
+ rc = CURLE_OPERATION_TIMEDOUT;
+ }
+
+ destroy_thread_data(&conn->async);
+
+ if(CURLE_OK != rc)
+ /* close the connection, since we must not return failure from here
+ without cleaning up this connection properly */
+ Curl_disconnect(conn);
+
+ 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)
+{
+ *entry = NULL;
+
+ if (conn->async.done) {
+ /* we're done */
+ 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));
+ }
+ else
+ TRACE(("not yet\n"));
+ return CURLE_OK;
+}
+
+CURLcode Curl_fdset(struct connectdata *conn,
+ fd_set *read_fd_set,
+ fd_set *write_fd_set,
+ int *max_fdp)
+{
+ const struct thread_data *td =
+ (const struct thread_data *) conn->async.os_specific;
+
+ if (td && td->dummy_sock != CURL_SOCKET_BAD) {
+ FD_SET(td->dummy_sock,write_fd_set);
+ *max_fdp = td->dummy_sock;
+ }
+ (void) read_fd_set;
+ return CURLE_OK;
+}
+
+#ifdef CURLRES_IPV4
+/*
+ * Curl_getaddrinfo() - for Windows threading without ENABLE_IPV6.
+ */
+Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
+ char *hostname,
+ int port,
+ int *waitp)
+{
+ struct hostent *h = NULL;
+ struct SessionHandle *data = conn->data;
+ in_addr_t in;
+
+ *waitp = 0; /* don't wait, we act synchronously */
+
+ in = inet_addr(hostname);
+ if (in != CURL_INADDR_NONE)
+ /* This is a dotted IP address 123.123.123.123-style */
+ return Curl_ip2addr(in, hostname);
+
+ /* 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; code %lu\n",
+ hostname, GetLastError());
+
+ h = gethostbyname(hostname);
+ if (!h) {
+ infof(data, "gethostbyname(2) failed for %s:%d; %s\n",
+ hostname, port, Curl_strerror(conn,WSAGetLastError()));
+ return NULL;
+ }
+ return h;
+}
+#endif /* CURLRES_IPV4 */
+
+#ifdef CURLRES_IPV6
+/*
+ * Curl_getaddrinfo() - for Windows threading IPv6 enabled
+ */
+Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
+ char *hostname,
+ int port,
+ int *waitp)
+{
+ struct addrinfo hints, *res;
+ int error;
+ char sbuf[NI_MAXSERV];
+ curl_socket_t s;
+ int pf;
+ struct SessionHandle *data = conn->data;
+
+ *waitp = FALSE; /* default to synch response */
+
+ /* see if we have an IPv6 stack */
+ s = socket(PF_INET6, SOCK_DGRAM, 0);
+ if (s < 0) {
+ /* 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);
+
+ /*
+ * Check if a more 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;
+ }
+ }
+
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_family = pf;
+ hints.ai_socktype = SOCK_STREAM;
+ hints.ai_flags = AI_CANONNAME;
+ 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; code %lu\n",
+ hostname, GetLastError());
+
+ error = getaddrinfo(hostname, sbuf, &hints, &res);
+ if (error) {
+ infof(data, "getaddrinfo() failed for %s:%d; %s\n",
+ hostname, port, Curl_strerror(conn,WSAGetLastError()));
+ return NULL;
+ }
+ return res;
+}
+#endif /* CURLRES_IPV6 */
+#endif /* CURLRES_THREADED */
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