mirror of
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f3d4b17a9c
No resolver anymore needs to use AI_CANONNAME and do reverse lookups. We should work hard to avoid having code that relies on it.
589 lines
15 KiB
C
589 lines
15 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2010, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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#include "setup.h"
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#include <string.h>
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#include <errno.h>
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#ifdef HAVE_NETDB_H
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#include <netdb.h>
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#endif
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#ifdef HAVE_ARPA_INET_H
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#include <arpa/inet.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h> /* required for free() prototypes */
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h> /* for the close() proto */
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#endif
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#ifdef __VMS
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#include <in.h>
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#include <inet.h>
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#include <stdlib.h>
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#endif
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#if defined(USE_THREADS_POSIX)
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# ifdef HAVE_PTHREAD_H
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# include <pthread.h>
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# endif
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#elif defined(USE_THREADS_WIN32)
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# ifdef HAVE_PROCESS_H
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# include <process.h>
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# endif
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#endif
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#if (defined(NETWARE) && defined(__NOVELL_LIBC__))
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#undef in_addr_t
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#define in_addr_t unsigned long
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#endif
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#include "urldata.h"
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#include "sendf.h"
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#include "hostip.h"
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#include "hash.h"
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#include "share.h"
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#include "strerror.h"
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#include "url.h"
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#include "multiif.h"
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#include "inet_pton.h"
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#include "inet_ntop.h"
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#include "curl_threads.h"
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#define _MPRINTF_REPLACE /* use our functions only */
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#include <curl/mprintf.h>
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#include "curl_memory.h"
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/* The last #include file should be: */
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#include "memdebug.h"
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/***********************************************************************
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* Only for threaded name resolves builds
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**********************************************************************/
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#ifdef CURLRES_THREADED
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/* This function is used to init a threaded resolve */
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static bool init_resolve_thread(struct connectdata *conn,
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const char *hostname, int port,
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const struct addrinfo *hints);
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/* Data for synchronization between resolver thread and its parent */
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struct thread_sync_data {
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curl_mutex_t * mtx;
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int done;
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char * hostname; /* hostname to resolve, Curl_async.hostname
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duplicate */
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int port;
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int sock_error;
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Curl_addrinfo *res;
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#ifdef HAVE_GETADDRINFO
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struct addrinfo hints;
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#endif
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};
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struct thread_data {
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curl_thread_t thread_hnd;
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curl_socket_t dummy_sock;
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unsigned int poll_interval;
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int interval_end;
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struct thread_sync_data tsd;
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};
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static struct thread_sync_data * conn_thread_sync_data(struct connectdata *conn)
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{
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return &(((struct thread_data *)conn->async.os_specific)->tsd);
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}
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#define CONN_THREAD_SYNC_DATA(conn) &(((conn)->async.os_specific)->tsd);
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/* Destroy resolver thread synchronization data */
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static
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void destroy_thread_sync_data(struct thread_sync_data * tsd)
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{
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if (tsd->mtx) {
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Curl_mutex_destroy(tsd->mtx);
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free(tsd->mtx);
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}
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if(tsd->hostname)
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free(tsd->hostname);
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if (tsd->res)
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Curl_freeaddrinfo(tsd->res);
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memset(tsd,0,sizeof(*tsd));
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}
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/* Initialize resolver thread synchronization data */
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static
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int init_thread_sync_data(struct thread_sync_data * tsd,
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const char * hostname,
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int port,
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const struct addrinfo *hints)
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{
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memset(tsd, 0, sizeof(*tsd));
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tsd->port = port;
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#ifdef CURLRES_IPV6
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DEBUGASSERT(hints);
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tsd->hints = *hints;
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#else
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(void) hints;
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#endif
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tsd->mtx = malloc(sizeof(curl_mutex_t));
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if (tsd->mtx == NULL) goto err_exit;
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Curl_mutex_init(tsd->mtx);
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tsd->sock_error = CURL_ASYNC_SUCCESS;
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/* Copying hostname string because original can be destroyed by parent
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* thread during gethostbyname execution.
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*/
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tsd->hostname = strdup(hostname);
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if (!tsd->hostname) goto err_exit;
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return 1;
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err_exit:
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/* Memory allocation failed */
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destroy_thread_sync_data(tsd);
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return 0;
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}
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static int getaddrinfo_complete(struct connectdata *conn)
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{
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struct thread_sync_data *tsd = conn_thread_sync_data(conn);
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int rc;
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rc = Curl_addrinfo_callback(conn, tsd->sock_error, tsd->res);
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/* The tsd->res structure has been copied to async.dns and perhaps the DNS cache.
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Set our copy to NULL so destroy_thread_sync_data doesn't free it.
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*/
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tsd->res = NULL;
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return rc;
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}
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#ifdef HAVE_GETADDRINFO
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/*
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* getaddrinfo_thread() resolves a name and then exits.
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*
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* For builds without ARES, but with ENABLE_IPV6, create a resolver thread
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* and wait on it.
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*/
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static unsigned int CURL_STDCALL getaddrinfo_thread (void *arg)
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{
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struct thread_sync_data *tsd = (struct thread_sync_data*)arg;
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char service [NI_MAXSERV];
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int rc;
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snprintf(service, sizeof(service), "%d", tsd->port);
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rc = Curl_getaddrinfo_ex(tsd->hostname, service, &tsd->hints, &tsd->res);
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if (rc != 0) {
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tsd->sock_error = SOCKERRNO;
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if (tsd->sock_error == 0)
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tsd->sock_error = ENOMEM;
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}
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Curl_mutex_acquire(tsd->mtx);
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tsd->done = 1;
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Curl_mutex_release(tsd->mtx);
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return 0;
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}
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#else /* HAVE_GETADDRINFO */
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/*
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* gethostbyname_thread() resolves a name and then exits.
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*/
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static unsigned int CURL_STDCALL gethostbyname_thread (void *arg)
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{
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struct thread_sync_data *tsd = (struct thread_sync_data *)arg;
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tsd->res = Curl_ipv4_resolve_r(tsd->hostname, tsd->port);
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if (!tsd->res) {
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tsd->sock_error = SOCKERRNO;
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if (tsd->sock_error == 0)
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tsd->sock_error = ENOMEM;
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}
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Curl_mutex_acquire(tsd->mtx);
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tsd->done = 1;
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Curl_mutex_release(tsd->mtx);
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return 0;
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}
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#endif /* HAVE_GETADDRINFO */
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/*
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* Curl_destroy_thread_data() cleans up async resolver data and thread handle.
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* Complementary of ares_destroy.
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*/
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void Curl_destroy_thread_data (struct Curl_async *async)
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{
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if(async->hostname)
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free(async->hostname);
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if(async->os_specific) {
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struct thread_data *td = (struct thread_data*) async->os_specific;
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if (td->dummy_sock != CURL_SOCKET_BAD)
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sclose(td->dummy_sock);
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if (td->thread_hnd != curl_thread_t_null)
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Curl_thread_join(&td->thread_hnd);
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destroy_thread_sync_data(&td->tsd);
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free(async->os_specific);
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}
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async->hostname = NULL;
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async->os_specific = NULL;
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}
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/*
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* init_resolve_thread() starts a new thread that performs the actual
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* resolve. This function returns before the resolve is done.
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*
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* Returns FALSE in case of failure, otherwise TRUE.
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*/
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static bool init_resolve_thread (struct connectdata *conn,
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const char *hostname, int port,
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const struct addrinfo *hints)
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{
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struct thread_data *td = calloc(1, sizeof(struct thread_data));
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int err = ENOMEM;
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conn->async.os_specific = (void*) td;
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if(!td)
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goto err_exit;
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conn->async.port = port;
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conn->async.done = FALSE;
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conn->async.status = 0;
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conn->async.dns = NULL;
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td->dummy_sock = CURL_SOCKET_BAD;
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td->thread_hnd = curl_thread_t_null;
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if (!init_thread_sync_data(&td->tsd, hostname, port, hints))
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goto err_exit;
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Curl_safefree(conn->async.hostname);
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conn->async.hostname = strdup(hostname);
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if(!conn->async.hostname)
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goto err_exit;
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#ifdef WIN32
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/* This socket is only to keep Curl_resolv_fdset() and select() happy;
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* should never become signalled for read since it's unbound but
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* Windows needs at least 1 socket in select().
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*/
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td->dummy_sock = socket(AF_INET, SOCK_DGRAM, 0);
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if (td->dummy_sock == CURL_SOCKET_BAD)
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goto err_exit;
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#endif
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#ifdef HAVE_GETADDRINFO
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td->thread_hnd = Curl_thread_create(getaddrinfo_thread, &td->tsd);
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#else
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td->thread_hnd = Curl_thread_create(gethostbyname_thread, &td->tsd);
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#endif
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if(!td->thread_hnd) {
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#ifndef _WIN32_WCE
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err = errno;
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#endif
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goto err_exit;
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}
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return TRUE;
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err_exit:
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Curl_destroy_thread_data(&conn->async);
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SET_ERRNO(err);
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return FALSE;
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}
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/*
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* Curl_wait_for_resolv() waits for a resolve to finish. This function should
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* be avoided since using this risk getting the multi interface to "hang".
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*
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* If 'entry' is non-NULL, make it point to the resolved dns entry
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*
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* This is the version for resolves-in-a-thread.
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*/
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CURLcode Curl_wait_for_resolv(struct connectdata *conn,
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struct Curl_dns_entry **entry)
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{
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struct thread_data *td = (struct thread_data*) conn->async.os_specific;
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struct SessionHandle *data = conn->data;
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CURLcode rc = CURLE_OK;
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DEBUGASSERT(conn && td);
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/* wait for the thread to resolve the name */
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if (Curl_thread_join(&td->thread_hnd)) {
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rc = getaddrinfo_complete(conn);
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} else {
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DEBUGASSERT(0);
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}
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conn->async.done = TRUE;
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if(entry)
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*entry = conn->async.dns;
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if(!conn->async.dns) {
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/* a name was not resolved */
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if (conn->bits.httpproxy) {
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failf(data, "Could not resolve proxy: %s; %s",
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conn->async.hostname, Curl_strerror(conn, conn->async.status));
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rc = CURLE_COULDNT_RESOLVE_PROXY;
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} else {
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failf(data, "Could not resolve host: %s; %s",
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conn->async.hostname, Curl_strerror(conn, conn->async.status));
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rc = CURLE_COULDNT_RESOLVE_HOST;
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}
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}
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Curl_destroy_thread_data(&conn->async);
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if(!conn->async.dns)
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conn->bits.close = TRUE;
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return (rc);
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}
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/*
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* Curl_is_resolved() is called repeatedly to check if a previous name resolve
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* request has completed. It should also make sure to time-out if the
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* operation seems to take too long.
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*/
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CURLcode Curl_is_resolved(struct connectdata *conn,
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struct Curl_dns_entry **entry)
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{
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struct SessionHandle *data = conn->data;
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struct thread_data *td = (struct thread_data*) conn->async.os_specific;
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int done = 0;
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*entry = NULL;
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if (!td) {
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DEBUGASSERT(td);
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return CURLE_COULDNT_RESOLVE_HOST;
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}
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Curl_mutex_acquire(td->tsd.mtx);
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done = td->tsd.done;
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Curl_mutex_release(td->tsd.mtx);
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if (done) {
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getaddrinfo_complete(conn);
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if (td->poll_interval != 0)
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Curl_expire(conn->data, 0);
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Curl_destroy_thread_data(&conn->async);
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if(!conn->async.dns) {
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failf(data, "Could not resolve host: %s; %s",
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conn->host.name, Curl_strerror(conn, conn->async.status));
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return CURLE_COULDNT_RESOLVE_HOST;
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}
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*entry = conn->async.dns;
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} else {
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/* poll for name lookup done with exponential backoff up to 250ms */
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int elapsed;
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elapsed = Curl_tvdiff(Curl_tvnow(), data->progress.t_startsingle);
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if (elapsed < 0) {
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elapsed = 0;
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}
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if (td->poll_interval == 0) {
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/* Start at 1ms poll interval */
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td->poll_interval = 1;
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} else if (elapsed >= td->interval_end) {
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/* Back-off exponentially if last interval expired */
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td->poll_interval *= 2;
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}
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if (td->poll_interval > 250)
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td->poll_interval = 250;
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td->interval_end = elapsed + td->poll_interval;
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Curl_expire(conn->data, td->poll_interval);
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}
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return CURLE_OK;
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}
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int Curl_resolv_getsock(struct connectdata *conn,
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curl_socket_t *socks,
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int numsocks)
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{
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const struct thread_data *td =
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(const struct thread_data *) conn->async.os_specific;
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if(td && td->dummy_sock != CURL_SOCKET_BAD) {
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if(numsocks) {
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/* return one socket waiting for readable, even though this is just
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a dummy */
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socks[0] = td->dummy_sock;
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return GETSOCK_READSOCK(0);
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}
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}
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return 0;
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}
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#ifndef HAVE_GETADDRINFO
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/*
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* Curl_getaddrinfo() - for platforms without getaddrinfo
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*/
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Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
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const char *hostname,
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int port,
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int *waitp)
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{
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struct hostent *h = NULL;
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struct SessionHandle *data = conn->data;
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struct in_addr in;
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*waitp = 0; /* default to synchronous response */
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if(Curl_inet_pton(AF_INET, hostname, &in) > 0)
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/* This is a dotted IP address 123.123.123.123-style */
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return Curl_ip2addr(AF_INET, &in, hostname, port);
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/* fire up a new resolver thread! */
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if(init_resolve_thread(conn, hostname, port, NULL)) {
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*waitp = 1; /* expect asynchronous response */
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return NULL;
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}
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/* fall-back to blocking version */
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return Curl_ipv4_resolve_r(hostname, port);
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}
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#else /* !HAVE_GETADDRINFO */
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/*
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* Curl_getaddrinfo() - for getaddrinfo
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*/
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Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
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const char *hostname,
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int port,
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int *waitp)
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{
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struct addrinfo hints;
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Curl_addrinfo *res;
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int error;
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char sbuf[NI_MAXSERV];
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int pf = PF_INET;
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struct SessionHandle *data = conn->data;
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*waitp = 0; /* default to synchronous response */
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#ifndef CURLRES_IPV4
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/*
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* Check if a limited name resolve has been requested.
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*/
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switch(data->set.ip_version) {
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case CURL_IPRESOLVE_V4:
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pf = PF_INET;
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break;
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case CURL_IPRESOLVE_V6:
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pf = PF_INET6;
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break;
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default:
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pf = PF_UNSPEC;
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break;
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}
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if (pf != PF_INET) {
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/* see if we have an IPv6 stack */
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curl_socket_t s = socket(PF_INET6, SOCK_DGRAM, 0);
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if(s == CURL_SOCKET_BAD) {
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/* Some non-IPv6 stacks have been found to make very slow name resolves
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|
* 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);
|
|
}
|
|
}
|
|
#endif /* !CURLRES_IPV4 */
|
|
|
|
memset(&hints, 0, sizeof(hints));
|
|
hints.ai_family = pf;
|
|
hints.ai_socktype = conn->socktype;
|
|
|
|
snprintf(sbuf, sizeof(sbuf), "%d", port);
|
|
|
|
/* fire up a new resolver thread! */
|
|
if(init_resolve_thread(conn, hostname, port, &hints)) {
|
|
*waitp = 1; /* expect asynchronous 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 /* !HAVE_GETADDRINFO */
|
|
|
|
#endif /* CURLRES_THREADED */
|