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curl/lib/hostares.c

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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2005, 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>
#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_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!
*/
CURLcode Curl_resolv_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 */
conn->bits.close = TRUE;
}
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,
(ares_host_callback)Curl_addrinfo4_callback, conn);
*waitp = TRUE; /* please wait for the response */
}
return NULL; /* no struct yet */
}
#endif /* CURLRES_ARES */
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