mirror of
https://github.com/moparisthebest/curl
synced 2024-12-21 23:58:49 -05:00
c39858aac0
linked list for name resolved data, even on hosts/systems with only IPv4 stacks as this simplifies a lot of code.
302 lines
8.5 KiB
C
302 lines
8.5 KiB
C
/***************************************************************************
|
|
* _ _ ____ _
|
|
* 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
|
|
|
|
#include "memory.h"
|
|
|
|
/* The last #include file should be: */
|
|
#include "memdebug.h"
|
|
|
|
/***********************************************************************
|
|
* Only for ares-enabled builds
|
|
**********************************************************************/
|
|
|
|
#ifdef CURLRES_ARES
|
|
|
|
/*
|
|
* Curl_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!
|
|
*/
|
|
|
|
CURLcode Curl_fdset(struct connectdata *conn,
|
|
fd_set *read_fd_set,
|
|
fd_set *write_fd_set,
|
|
int *max_fdp)
|
|
|
|
{
|
|
int max = ares_fds(conn->data->state.areschannel,
|
|
read_fd_set, write_fd_set);
|
|
*max_fdp = max;
|
|
|
|
return CURLE_OK;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
fd_set read_fds, write_fds;
|
|
struct timeval tv={0,0};
|
|
struct SessionHandle *data = conn->data;
|
|
int nfds;
|
|
|
|
FD_ZERO(&read_fds);
|
|
FD_ZERO(&write_fds);
|
|
|
|
nfds = ares_fds(data->state.areschannel, &read_fds, &write_fds);
|
|
|
|
(void)select(nfds, &read_fds, &write_fds, NULL,
|
|
(struct timeval *)&tv);
|
|
|
|
/* Call ares_process() unconditonally here, even if we simply timed out
|
|
above, as otherwise the ares name resolve won't timeout! */
|
|
ares_process(data->state.areschannel, &read_fds, &write_fds);
|
|
|
|
*dns = NULL;
|
|
|
|
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 = CURL_TIMEOUT_RESOLVE; /* default name resolve timeout */
|
|
|
|
/* now, see if there's a connect timeout or a regular timeout to
|
|
use instead of the default one */
|
|
if(conn->data->set.connecttimeout)
|
|
timeout = conn->data->set.connecttimeout;
|
|
else if(conn->data->set.timeout)
|
|
timeout = conn->data->set.timeout;
|
|
|
|
/* We convert the number of seconds into number of milliseconds here: */
|
|
if(timeout < 2147483)
|
|
/* maximum amount of seconds that can be multiplied with 1000 and
|
|
still fit within 31 bits */
|
|
timeout *= 1000;
|
|
else
|
|
timeout = 0x7fffffff; /* ridiculous amount of time anyway */
|
|
|
|
/* Wait for the name resolve query to complete. */
|
|
while (1) {
|
|
int nfds=0;
|
|
fd_set read_fds, write_fds;
|
|
struct timeval *tvp, tv, store;
|
|
int count;
|
|
struct timeval now = Curl_tvnow();
|
|
long timediff;
|
|
|
|
store.tv_sec = (int)timeout/1000;
|
|
store.tv_usec = (timeout%1000)*1000;
|
|
|
|
FD_ZERO(&read_fds);
|
|
FD_ZERO(&write_fds);
|
|
nfds = ares_fds(data->state.areschannel, &read_fds, &write_fds);
|
|
if (nfds == 0)
|
|
/* no file descriptors means we're done waiting */
|
|
break;
|
|
tvp = ares_timeout(data->state.areschannel, &store, &tv);
|
|
count = select(nfds, &read_fds, &write_fds, NULL, tvp);
|
|
if (count < 0 && errno != EINVAL)
|
|
break;
|
|
|
|
ares_process(data->state.areschannel, &read_fds, &write_fds);
|
|
|
|
timediff = Curl_tvdiff(Curl_tvnow(), now); /* spent time */
|
|
timeout -= timediff?timediff:1; /* always deduct at least 1 */
|
|
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)) {
|
|
failf(data, "Resolving host timed out: %s", conn->host.dispname);
|
|
rc = CURLE_OPERATION_TIMEDOUT;
|
|
}
|
|
else if(conn->async.done) {
|
|
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 */
|
|
Curl_disconnect(conn);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* 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,
|
|
char *hostname,
|
|
int port,
|
|
int *waitp)
|
|
{
|
|
char *bufp;
|
|
struct SessionHandle *data = conn->data;
|
|
in_addr_t in = inet_addr(hostname);
|
|
|
|
*waitp = FALSE;
|
|
|
|
if (in != CURL_INADDR_NONE) {
|
|
/* This is a dotted IP address 123.123.123.123-style */
|
|
return Curl_ip2addr(in, hostname, port);
|
|
}
|
|
|
|
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, PF_INET,
|
|
Curl_addrinfo4_callback, conn);
|
|
|
|
*waitp = TRUE; /* please wait for the response */
|
|
}
|
|
return NULL; /* no struct yet */
|
|
}
|
|
|
|
#endif /* CURLRES_ARES */
|