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diff --git a/lib/hostares.c b/lib/hostares.c
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+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2010, 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.
+ *
+ ***************************************************************************/
+
+#include "setup.h"
+
+#include <string.h>
+
+#ifdef HAVE_LIMITS_H
+#include <limits.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
+
+#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"
+#include "connect.h"
+#include "select.h"
+#include "progress.h"
+
+#define _MPRINTF_REPLACE /* use our functions only */
+#include <curl/mprintf.h>
+
+#include "curl_memory.h"
+/* The last #include file should be: */
+#include "memdebug.h"
+
+/***********************************************************************
+ * Only for ares-enabled builds
+ **********************************************************************/
+
+#ifdef CURLRES_ARES
+
+/*
+ * Curl_resolv_fdset() is called when someone from the outside world (using
+ * curl_multi_fdset()) wants to get our fd_set setup and we're talking with
+ * ares. The caller must make sure that this function is only called when we
+ * have a working ares channel.
+ *
+ * Returns: CURLE_OK always!
+ */
+
+int Curl_resolv_getsock(struct connectdata *conn,
+ curl_socket_t *socks,
+ int numsocks)
+
+{
+ struct timeval maxtime;
+ struct timeval timebuf;
+ struct timeval *timeout;
+ int max = ares_getsock(conn->data->state.areschannel,
+ (ares_socket_t *)socks, numsocks);
+
+
+ maxtime.tv_sec = CURL_TIMEOUT_RESOLVE;
+ maxtime.tv_usec = 0;
+
+ timeout = ares_timeout(conn->data->state.areschannel, &maxtime, &timebuf);
+
+ Curl_expire(conn->data,
+ (timeout->tv_sec * 1000) + (timeout->tv_usec/1000));
+
+ return max;
+}
+
+/*
+ * waitperform()
+ *
+ * 1) Ask ares what sockets it currently plays with, then
+ * 2) wait for the timeout period to check for action on ares' sockets.
+ * 3) tell ares to act on all the sockets marked as "with action"
+ *
+ * return number of sockets it worked on
+ */
+
+static int waitperform(struct connectdata *conn, int timeout_ms)
+{
+ struct SessionHandle *data = conn->data;
+ int nfds;
+ int bitmask;
+ ares_socket_t socks[ARES_GETSOCK_MAXNUM];
+ struct pollfd pfd[ARES_GETSOCK_MAXNUM];
+ int i;
+ int num = 0;
+
+ bitmask = ares_getsock(data->state.areschannel, socks, ARES_GETSOCK_MAXNUM);
+
+ for(i=0; i < ARES_GETSOCK_MAXNUM; i++) {
+ pfd[i].events = 0;
+ pfd[i].revents = 0;
+ if(ARES_GETSOCK_READABLE(bitmask, i)) {
+ pfd[i].fd = socks[i];
+ pfd[i].events |= POLLRDNORM|POLLIN;
+ }
+ if(ARES_GETSOCK_WRITABLE(bitmask, i)) {
+ pfd[i].fd = socks[i];
+ pfd[i].events |= POLLWRNORM|POLLOUT;
+ }
+ if(pfd[i].events != 0)
+ num++;
+ else
+ break;
+ }
+
+ if(num)
+ nfds = Curl_poll(pfd, num, timeout_ms);
+ else
+ nfds = 0;
+
+ if(!nfds)
+ /* Call ares_process() unconditonally here, even if we simply timed out
+ above, as otherwise the ares name resolve won't timeout! */
+ ares_process_fd(data->state.areschannel, ARES_SOCKET_BAD, ARES_SOCKET_BAD);
+ else {
+ /* move through the descriptors and ask for processing on them */
+ for(i=0; i < num; i++)
+ ares_process_fd(data->state.areschannel,
+ pfd[i].revents & (POLLRDNORM|POLLIN)?
+ pfd[i].fd:ARES_SOCKET_BAD,
+ pfd[i].revents & (POLLWRNORM|POLLOUT)?
+ pfd[i].fd:ARES_SOCKET_BAD);
+ }
+ return nfds;
+}
+
+/*
+ * 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.
+ *
+ * Returns normal CURLcode errors.
+ */
+CURLcode Curl_is_resolved(struct connectdata *conn,
+ struct Curl_dns_entry **dns)
+{
+ struct SessionHandle *data = conn->data;
+
+ *dns = NULL;
+
+ waitperform(conn, 0);
+
+ if(conn->async.done) {
+ /* we're done, kill the ares handle */
+ if(!conn->async.dns) {
+ failf(data, "Could not resolve host: %s (%s)", conn->host.dispname,
+ ares_strerror(conn->async.status));
+ return CURLE_COULDNT_RESOLVE_HOST;
+ }
+ *dns = 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
+ *
+ * Returns CURLE_COULDNT_RESOLVE_HOST if the host was not resolved, and
+ * CURLE_OPERATION_TIMEDOUT if a time-out occurred.
+ */
+CURLcode Curl_wait_for_resolv(struct connectdata *conn,
+ struct Curl_dns_entry **entry)
+{
+ CURLcode rc=CURLE_OK;
+ struct SessionHandle *data = conn->data;
+ long timeout;
+ struct timeval now = Curl_tvnow();
+
+ timeout = Curl_timeleft(conn, &now, TRUE);
+ if(!timeout)
+ timeout = CURL_TIMEOUT_RESOLVE * 1000; /* default name resolve timeout */
+
+ /* Wait for the name resolve query to complete. */
+ for(;;) {
+ struct timeval *tvp, tv, store;
+ long timediff;
+ int itimeout;
+ int timeout_ms;
+
+ itimeout = (timeout > (long)INT_MAX) ? INT_MAX : (int)timeout;
+
+ store.tv_sec = itimeout/1000;
+ store.tv_usec = (itimeout%1000)*1000;
+
+ tvp = ares_timeout(data->state.areschannel, &store, &tv);
+
+ /* use the timeout period ares returned to us above if less than one
+ second is left, otherwise just use 1000ms to make sure the progress
+ callback gets called frequent enough */
+ if(!tvp->tv_sec)
+ timeout_ms = (int)(tvp->tv_usec/1000);
+ else
+ timeout_ms = 1000;
+
+ waitperform(conn, timeout_ms);
+
+ if(conn->async.done)
+ break;
+
+ if(Curl_pgrsUpdate(conn)) {
+ rc = CURLE_ABORTED_BY_CALLBACK;
+ timeout = -1; /* trigger the cancel below */
+ }
+ else {
+ struct timeval now2 = Curl_tvnow();
+ timediff = Curl_tvdiff(now2, now); /* spent time */
+ timeout -= timediff?timediff:1; /* always deduct at least 1 */
+ now = now2; /* for next loop */
+ }
+ if(timeout < 0) {
+ /* our timeout, so we cancel the ares operation */
+ ares_cancel(data->state.areschannel);
+ break;
+ }
+ }
+
+ /* Operation complete, if the lookup was successful we now have the entry
+ in the cache. */
+
+ if(entry)
+ *entry = conn->async.dns;
+
+ if(!conn->async.dns) {
+ /* a name was not resolved */
+ if((timeout < 0) || (conn->async.status == ARES_ETIMEOUT)) {
+ if (conn->bits.httpproxy) {
+ failf(data, "Resolving proxy timed out: %s", conn->proxy.dispname);
+ rc = CURLE_COULDNT_RESOLVE_PROXY;
+ }
+ else {
+ failf(data, "Resolving host timed out: %s", conn->host.dispname);
+ rc = CURLE_COULDNT_RESOLVE_HOST;
+ }
+ }
+ else if(conn->async.done) {
+ if (conn->bits.httpproxy) {
+ failf(data, "Could not resolve proxy: %s (%s)", conn->proxy.dispname,
+ ares_strerror(conn->async.status));
+ rc = CURLE_COULDNT_RESOLVE_PROXY;
+ }
+ else {
+ failf(data, "Could not resolve host: %s (%s)", conn->host.dispname,
+ ares_strerror(conn->async.status));
+ rc = CURLE_COULDNT_RESOLVE_HOST;
+ }
+ }
+ else
+ rc = CURLE_OPERATION_TIMEDOUT;
+
+ /* close the connection, since we can't return failure here without
+ cleaning up this connection properly */
+ conn->bits.close = TRUE;
+ }
+
+ return rc;
+}
+
+/*
+ * ares_query_completed_cb() is the callback that ares will call when
+ * the host query initiated by ares_gethostbyname() from Curl_getaddrinfo(),
+ * when using ares, is completed either successfully or with failure.
+ */
+static void ares_query_completed_cb(void *arg, /* (struct connectdata *) */
+ int status,
+#ifdef HAVE_CARES_CALLBACK_TIMEOUTS
+ int timeouts,
+#endif
+ struct hostent *hostent)
+{
+ struct connectdata *conn = (struct connectdata *)arg;
+ struct Curl_addrinfo * ai = NULL;
+
+#ifdef HAVE_CARES_CALLBACK_TIMEOUTS
+ (void)timeouts; /* ignored */
+#endif
+
+ if (status == CURL_ASYNC_SUCCESS) {
+ ai = Curl_he2ai(hostent, conn->async.port);
+ }
+
+ (void)Curl_addrinfo_callback(arg, status, ai);
+}
+
+/*
+ * Curl_getaddrinfo() - when using ares
+ *
+ * Returns name information about the given hostname and port number. If
+ * successful, the 'hostent' is returned and the forth argument will point to
+ * memory we need to free after use. That memory *MUST* be freed with
+ * Curl_freeaddrinfo(), nothing else.
+ */
+Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
+ const char *hostname,
+ int port,
+ int *waitp)
+{
+ char *bufp;
+ struct SessionHandle *data = conn->data;
+ struct in_addr in;
+ int family = PF_INET;
+#ifdef ENABLE_IPV6 /* CURLRES_IPV6 */
+ struct in6_addr in6;
+#endif /* CURLRES_IPV6 */
+
+ *waitp = 0; /* default to synchronous response */
+
+ /* First check if this is an IPv4 address string */
+ 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);
+ }
+
+#ifdef ENABLE_IPV6 /* CURLRES_IPV6 */
+ /* Otherwise, check if this is an IPv6 address string */
+ if (Curl_inet_pton (AF_INET6, hostname, &in6) > 0) {
+ /* This must be an IPv6 address literal. */
+ return Curl_ip2addr(AF_INET6, &in6, hostname, port);
+ }
+
+ switch(conn->ip_version) {
+ default:
+#if ARES_VERSION >= 0x010601
+ family = PF_UNSPEC; /* supported by c-ares since 1.6.1, so for older
+ c-ares versions this just falls through and defaults
+ to PF_INET */
+ break;
+#endif
+ case CURL_IPRESOLVE_V4:
+ family = PF_INET;
+ break;
+ case CURL_IPRESOLVE_V6:
+ family = PF_INET6;
+ break;
+ }
+#endif /* CURLRES_IPV6 */
+
+ bufp = strdup(hostname);
+
+ if(bufp) {
+ Curl_safefree(conn->async.hostname);
+ conn->async.hostname = bufp;
+ conn->async.port = port;
+ conn->async.done = FALSE; /* not done */
+ conn->async.status = 0; /* clear */
+ conn->async.dns = NULL; /* clear */
+
+ /* areschannel is already setup in the Curl_open() function */
+ ares_gethostbyname(data->state.areschannel, hostname, family,
+ (ares_host_callback)ares_query_completed_cb, conn);
+
+ *waitp = 1; /* expect asynchronous response */
+ }
+ return NULL; /* no struct yet */
+}
+#endif /* CURLRES_ARES */
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