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-rw-r--r--lib/asyn-ares.c639
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diff --git a/lib/asyn-ares.c b/lib/asyn-ares.c
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-/***************************************************************************
- * _ _ ____ _
- * Project ___| | | | _ \| |
- * / __| | | | |_) | |
- * | (__| |_| | _ <| |___
- * \___|\___/|_| \_\_____|
- *
- * Copyright (C) 1998 - 2012, 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 "curl_setup.h"
-
-#ifdef HAVE_LIMITS_H
-#include <limits.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 __VMS
-#include <in.h>
-#include <inet.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
-
-/***********************************************************************
- * Only for ares-enabled builds
- * And only for functions that fulfill the asynch resolver backend API
- * as defined in curl_asyn.h, nothing else belongs in this file!
- **********************************************************************/
-
-#ifdef CURLRES_ARES
-
-#include "curl_urldata.h"
-#include "curl_sendf.h"
-#include "curl_hostip.h"
-#include "curl_hash.h"
-#include "curl_share.h"
-#include "curl_strerror.h"
-#include "curl_url.h"
-#include "curl_multiif.h"
-#include "curl_inet_pton.h"
-#include "curl_connect.h"
-#include "curl_select.h"
-#include "curl_progress.h"
-
-#define _MPRINTF_REPLACE /* use our functions only */
-#include <curl/mprintf.h>
-
-# if defined(CURL_STATICLIB) && !defined(CARES_STATICLIB) && \
- (defined(WIN32) || defined(_WIN32) || defined(__SYMBIAN32__))
-# define CARES_STATICLIB
-# endif
-# include <ares.h>
-# include <ares_version.h> /* really old c-ares didn't include this by
- itself */
-
-#if ARES_VERSION >= 0x010500
-/* c-ares 1.5.0 or later, the callback proto is modified */
-#define HAVE_CARES_CALLBACK_TIMEOUTS 1
-#endif
-
-#include "curl_memory.h"
-/* The last #include file should be: */
-#include "curl_memdebug.h"
-
-struct ResolverResults {
- int num_pending; /* number of ares_gethostbyname() requests */
- Curl_addrinfo *temp_ai; /* intermediary result while fetching c-ares parts */
- int last_status;
-};
-
-/*
- * Curl_resolver_global_init() - the generic low-level asynchronous name
- * resolve API. Called from curl_global_init() to initialize global resolver
- * environment. Initializes ares library.
- */
-int Curl_resolver_global_init(void)
-{
-#ifdef CARES_HAVE_ARES_LIBRARY_INIT
- if(ares_library_init(ARES_LIB_INIT_ALL)) {
- return CURLE_FAILED_INIT;
- }
-#endif
- return CURLE_OK;
-}
-
-/*
- * Curl_resolver_global_cleanup()
- *
- * Called from curl_global_cleanup() to destroy global resolver environment.
- * Deinitializes ares library.
- */
-void Curl_resolver_global_cleanup(void)
-{
-#ifdef CARES_HAVE_ARES_LIBRARY_CLEANUP
- ares_library_cleanup();
-#endif
-}
-
-/*
- * Curl_resolver_init()
- *
- * Called from curl_easy_init() -> Curl_open() to initialize resolver
- * URL-state specific environment ('resolver' member of the UrlState
- * structure). Fills the passed pointer by the initialized ares_channel.
- */
-CURLcode Curl_resolver_init(void **resolver)
-{
- int status = ares_init((ares_channel*)resolver);
- if(status != ARES_SUCCESS) {
- if(status == ARES_ENOMEM)
- return CURLE_OUT_OF_MEMORY;
- else
- return CURLE_FAILED_INIT;
- }
- return CURLE_OK;
- /* make sure that all other returns from this function should destroy the
- ares channel before returning error! */
-}
-
-/*
- * Curl_resolver_cleanup()
- *
- * Called from curl_easy_cleanup() -> Curl_close() to cleanup resolver
- * URL-state specific environment ('resolver' member of the UrlState
- * structure). Destroys the ares channel.
- */
-void Curl_resolver_cleanup(void *resolver)
-{
- ares_destroy((ares_channel)resolver);
-}
-
-/*
- * Curl_resolver_duphandle()
- *
- * Called from curl_easy_duphandle() to duplicate resolver URL-state specific
- * environment ('resolver' member of the UrlState structure). Duplicates the
- * 'from' ares channel and passes the resulting channel to the 'to' pointer.
- */
-int Curl_resolver_duphandle(void **to, void *from)
-{
- /* Clone the ares channel for the new handle */
- if(ARES_SUCCESS != ares_dup((ares_channel*)to,(ares_channel)from))
- return CURLE_FAILED_INIT;
- return CURLE_OK;
-}
-
-static void destroy_async_data (struct Curl_async *async);
-
-/*
- * Cancel all possibly still on-going resolves for this connection.
- */
-void Curl_resolver_cancel(struct connectdata *conn)
-{
- if(conn && conn->data && conn->data->state.resolver)
- ares_cancel((ares_channel)conn->data->state.resolver);
- destroy_async_data(&conn->async);
-}
-
-/*
- * destroy_async_data() cleans up async resolver data.
- */
-static void destroy_async_data (struct Curl_async *async)
-{
- if(async->hostname)
- free(async->hostname);
-
- if(async->os_specific) {
- struct ResolverResults *res = (struct ResolverResults *)async->os_specific;
- if(res) {
- if(res->temp_ai) {
- Curl_freeaddrinfo(res->temp_ai);
- res->temp_ai = NULL;
- }
- free(res);
- }
- async->os_specific = NULL;
- }
-
- async->hostname = NULL;
-}
-
-/*
- * Curl_resolver_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_resolver_getsock(struct connectdata *conn,
- curl_socket_t *socks,
- int numsocks)
-
-{
- struct timeval maxtime;
- struct timeval timebuf;
- struct timeval *timeout;
- long milli;
- int max = ares_getsock((ares_channel)conn->data->state.resolver,
- (ares_socket_t *)socks, numsocks);
-
- maxtime.tv_sec = CURL_TIMEOUT_RESOLVE;
- maxtime.tv_usec = 0;
-
- timeout = ares_timeout((ares_channel)conn->data->state.resolver, &maxtime,
- &timebuf);
- milli = (timeout->tv_sec * 1000) + (timeout->tv_usec/1000);
- if(milli == 0)
- milli += 10;
- Curl_expire(conn->data, milli);
-
- 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((ares_channel)data->state.resolver, 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((ares_channel)data->state.resolver, 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((ares_channel)data->state.resolver,
- 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_resolver_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_resolver_is_resolved(struct connectdata *conn,
- struct Curl_dns_entry **dns)
-{
- struct SessionHandle *data = conn->data;
- struct ResolverResults *res = (struct ResolverResults *)
- conn->async.os_specific;
-
- *dns = NULL;
-
- waitperform(conn, 0);
-
- if(res && !res->num_pending) {
- (void)Curl_addrinfo_callback(conn, res->last_status, res->temp_ai);
- /* temp_ai ownership is moved to the connection, so we need not free-up
- them */
- res->temp_ai = NULL;
- destroy_async_data(&conn->async);
- if(!conn->async.dns) {
- failf(data, "Could not resolve %s: %s (%s)",
- conn->bits.proxy?"proxy":"host",
- conn->host.dispname,
- ares_strerror(conn->async.status));
- return conn->bits.proxy?CURLE_COULDNT_RESOLVE_PROXY:
- CURLE_COULDNT_RESOLVE_HOST;
- }
- *dns = conn->async.dns;
- }
-
- return CURLE_OK;
-}
-
-/*
- * Curl_resolver_wait_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_resolver_wait_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();
- struct Curl_dns_entry *temp_entry;
-
- timeout = Curl_timeleft(data, &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((ares_channel)data->state.resolver, &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);
- Curl_resolver_is_resolved(conn,&temp_entry);
-
- 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((ares_channel)data->state.resolver);
- 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.proxy) {
- 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.proxy) {
- 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;
-}
-
-/* Connects results to the list */
-static void compound_results(struct ResolverResults *res,
- Curl_addrinfo *ai)
-{
- Curl_addrinfo *ai_tail;
- if(!ai)
- return;
- ai_tail = ai;
-
- while(ai_tail->ai_next)
- ai_tail = ai_tail->ai_next;
-
- /* Add the new results to the list of old results. */
- ai_tail->ai_next = res->temp_ai;
- res->temp_ai = ai;
-}
-
-/*
- * 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 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 ResolverResults *res;
-
-#ifdef HAVE_CARES_CALLBACK_TIMEOUTS
- (void)timeouts; /* ignored */
-#endif
-
- if(ARES_EDESTRUCTION == status)
- /* when this ares handle is getting destroyed, the 'arg' pointer may not
- be valid so only defer it when we know the 'status' says its fine! */
- return;
-
- res = (struct ResolverResults *)conn->async.os_specific;
- res->num_pending--;
-
- if(CURL_ASYNC_SUCCESS == status) {
- Curl_addrinfo *ai = Curl_he2ai(hostent, conn->async.port);
- if(ai) {
- compound_results(res, ai);
- }
- }
- /* A successful result overwrites any previous error */
- if(res->last_status != ARES_SUCCESS)
- res->last_status = status;
-}
-
-/*
- * Curl_resolver_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_resolver_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) {
- struct ResolverResults *res = NULL;
- 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 */
- res = calloc(sizeof(struct ResolverResults),1);
- if(!res) {
- Curl_safefree(conn->async.hostname);
- conn->async.hostname = NULL;
- return NULL;
- }
- conn->async.os_specific = res;
-
- /* initial status - failed */
- res->last_status = ARES_ENOTFOUND;
-#ifdef ENABLE_IPV6 /* CURLRES_IPV6 */
- if(family == PF_UNSPEC) {
- if(Curl_ipv6works()) {
- res->num_pending = 2;
-
- /* areschannel is already setup in the Curl_open() function */
- ares_gethostbyname((ares_channel)data->state.resolver, hostname,
- PF_INET, query_completed_cb, conn);
- ares_gethostbyname((ares_channel)data->state.resolver, hostname,
- PF_INET6, query_completed_cb, conn);
- }
- else {
- res->num_pending = 1;
-
- /* areschannel is already setup in the Curl_open() function */
- ares_gethostbyname((ares_channel)data->state.resolver, hostname,
- PF_INET, query_completed_cb, conn);
- }
- }
- else
-#endif /* CURLRES_IPV6 */
- {
- res->num_pending = 1;
-
- /* areschannel is already setup in the Curl_open() function */
- ares_gethostbyname((ares_channel)data->state.resolver, hostname, family,
- query_completed_cb, conn);
- }
-
- *waitp = 1; /* expect asynchronous response */
- }
- return NULL; /* no struct yet */
-}
-
-CURLcode Curl_set_dns_servers(struct SessionHandle *data,
- char *servers)
-{
- CURLcode result = CURLE_NOT_BUILT_IN;
-#if (ARES_VERSION >= 0x010704)
- int ares_result = ares_set_servers_csv(data->state.resolver, servers);
- switch(ares_result) {
- case ARES_SUCCESS:
- result = CURLE_OK;
- break;
- case ARES_ENOMEM:
- result = CURLE_OUT_OF_MEMORY;
- break;
- case ARES_ENOTINITIALIZED:
- case ARES_ENODATA:
- case ARES_EBADSTR:
- default:
- result = CURLE_BAD_FUNCTION_ARGUMENT;
- break;
- }
-#else /* too old c-ares version! */
- (void)data;
- (void)servers;
-#endif
- return result;
-}
-#endif /* CURLRES_ARES */