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7b18f64309
git-svn-id: https://unknownworlds.svn.cloudforge.com/ns1@16 67975925-1194-0748-b3d5-c16f83f1a3a1
728 lines
20 KiB
C
728 lines
20 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 - 2003, 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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* $Id: connect.c,v 1.56 2003/05/13 12:12:17 bagder Exp $
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***************************************************************************/
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#include "setup.h"
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#ifndef WIN32
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/* headers for non-win32 */
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.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_FCNTL_H
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#include <fcntl.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_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() prototype, without it, this crashes
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on macos 68K */
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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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#endif
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#endif
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#ifndef TRUE
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#define TRUE 1
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#define FALSE 0
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#endif
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#ifdef WIN32
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#define HAVE_IOCTLSOCKET
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#include <windows.h>
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#include <winsock.h>
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#define EINPROGRESS WSAEINPROGRESS
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#define EWOULDBLOCK WSAEWOULDBLOCK
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#define EISCONN WSAEISCONN
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#endif
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#include "urldata.h"
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#include "sendf.h"
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#include "if2ip.h"
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/* The last #include file should be: */
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#ifdef MALLOCDEBUG
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#include "memdebug.h"
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#endif
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int Curl_ourerrno(void)
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{
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#ifdef WIN32
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return (int)GetLastError();
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#else
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return errno;
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#endif
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}
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/*************************************************************************
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* Curl_nonblock
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*
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* Description:
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* Set the socket to either blocking or non-blocking mode.
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*/
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int Curl_nonblock(int socket, /* operate on this */
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int nonblock /* TRUE or FALSE */)
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{
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#undef SETBLOCK
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#ifdef HAVE_O_NONBLOCK
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int flags;
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flags = fcntl(socket, F_GETFL, 0);
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if (TRUE == nonblock)
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return fcntl(socket, F_SETFL, flags | O_NONBLOCK);
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else
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return fcntl(socket, F_SETFL, flags & (~O_NONBLOCK));
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#define SETBLOCK 1
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#endif
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#ifdef HAVE_FIONBIO
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int flags;
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flags = nonblock;
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return ioctl(socket, FIONBIO, &flags);
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#define SETBLOCK 2
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#endif
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#ifdef HAVE_IOCTLSOCKET
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int flags;
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flags = nonblock;
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return ioctlsocket(socket, FIONBIO, &flags);
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#define SETBLOCK 3
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#endif
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#ifdef HAVE_IOCTLSOCKET_CASE
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return IoctlSocket(socket, FIONBIO, (long)nonblock);
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#define SETBLOCK 4
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#endif
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#ifdef HAVE_DISABLED_NONBLOCKING
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return 0; /* returns success */
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#define SETBLOCK 5
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#endif
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#ifndef SETBLOCK
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#error "no non-blocking method was found/used/set"
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#endif
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}
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/*
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* waitconnect() returns:
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* 0 fine connect
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* -1 select() error
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* 1 select() timeout
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* 2 select() returned with an error condition
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*/
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static
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int waitconnect(int sockfd, /* socket */
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int timeout_msec)
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{
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fd_set fd;
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fd_set errfd;
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struct timeval interval;
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int rc;
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/* now select() until we get connect or timeout */
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FD_ZERO(&fd);
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FD_SET(sockfd, &fd);
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FD_ZERO(&errfd);
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FD_SET(sockfd, &errfd);
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interval.tv_sec = timeout_msec/1000;
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timeout_msec -= interval.tv_sec*1000;
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interval.tv_usec = timeout_msec*1000;
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rc = select(sockfd+1, NULL, &fd, &errfd, &interval);
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if(-1 == rc)
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/* error, no connect here, try next */
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return -1;
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else if(0 == rc)
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/* timeout, no connect today */
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return 1;
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if(FD_ISSET(sockfd, &errfd))
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/* error condition caught */
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return 2;
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/* we have a connect! */
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return 0;
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}
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static CURLcode bindlocal(struct connectdata *conn,
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int sockfd)
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{
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#if !defined(WIN32)||defined(__CYGWIN32__)
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/* We don't generally like checking for OS-versions, we should make this
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HAVE_XXXX based, although at the moment I don't have a decent test for
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this! */
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#ifdef HAVE_INET_NTOA
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struct SessionHandle *data = conn->data;
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/*************************************************************
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* Select device to bind socket to
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*************************************************************/
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if (strlen(data->set.device)<255) {
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struct sockaddr_in sa;
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struct Curl_dns_entry *h=NULL;
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size_t size;
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char myhost[256] = "";
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in_addr_t in;
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/* First check if the given name is an IP address */
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in=inet_addr(data->set.device);
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if((in == CURL_INADDR_NONE) &&
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Curl_if2ip(data->set.device, myhost, sizeof(myhost))) {
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/*
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* We now have the numerical IPv4-style x.y.z.w in the 'myhost' buffer
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*/
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h = Curl_resolv(data, myhost, 0);
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}
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else {
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if(strlen(data->set.device)>1) {
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/*
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* This was not an interface, resolve the name as a host name
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* or IP number
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*/
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h = Curl_resolv(data, data->set.device, 0);
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if(h) {
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/* we know data->set.device is shorter than the myhost array */
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strcpy(myhost, data->set.device);
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}
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}
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}
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if(! *myhost) {
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/* need to fix this
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h=Curl_gethost(data,
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getmyhost(*myhost,sizeof(myhost)),
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hostent_buf,
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sizeof(hostent_buf));
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*/
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return CURLE_HTTP_PORT_FAILED;
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}
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infof(data, "We bind local end to %s\n", myhost);
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in=inet_addr(myhost);
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if (CURL_INADDR_NONE != in) {
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if ( h ) {
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Curl_addrinfo *addr = h->addr;
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Curl_resolv_unlock(data, h);
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/* we don't need it anymore after this function has returned */
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#ifdef ENABLE_IPV6
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(void)sa; /* prevent compiler warning */
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if( bind(sockfd, addr->ai_addr, addr->ai_addrlen) >= 0) {
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/* we succeeded to bind */
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struct sockaddr_in6 add;
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size = sizeof(add);
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if(getsockname(sockfd, (struct sockaddr *) &add,
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(socklen_t *)&size)<0) {
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failf(data, "getsockname() failed");
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return CURLE_HTTP_PORT_FAILED;
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}
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}
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#else
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memset((char *)&sa, 0, sizeof(sa));
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memcpy((char *)&sa.sin_addr, addr->h_addr, addr->h_length);
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sa.sin_family = AF_INET;
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sa.sin_addr.s_addr = in;
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sa.sin_port = 0; /* get any port */
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if( bind(sockfd, (struct sockaddr *)&sa, sizeof(sa)) >= 0) {
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/* we succeeded to bind */
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struct sockaddr_in add;
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size = sizeof(add);
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if(getsockname(sockfd, (struct sockaddr *) &add,
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(socklen_t *)&size)<0) {
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failf(data, "getsockname() failed");
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return CURLE_HTTP_PORT_FAILED;
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}
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}
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#endif
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else {
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switch(errno) {
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case EBADF:
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failf(data, "Invalid descriptor: %d", errno);
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break;
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case EINVAL:
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failf(data, "Invalid request: %d", errno);
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break;
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case EACCES:
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failf(data, "Address is protected, user not superuser: %d", errno);
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break;
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case ENOTSOCK:
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failf(data,
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"Argument is a descriptor for a file, not a socket: %d",
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errno);
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break;
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case EFAULT:
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failf(data, "Inaccessable memory error: %d", errno);
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break;
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case ENAMETOOLONG:
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failf(data, "Address too long: %d", errno);
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break;
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case ENOMEM:
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failf(data, "Insufficient kernel memory was available: %d", errno);
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break;
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default:
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failf(data, "errno %d", errno);
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break;
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} /* end of switch(errno) */
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return CURLE_HTTP_PORT_FAILED;
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} /* end of else */
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} /* end of if h */
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else {
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failf(data,"could't find my own IP address (%s)", myhost);
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return CURLE_HTTP_PORT_FAILED;
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}
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} /* end of inet_addr */
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else {
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failf(data, "could't find my own IP address (%s)", myhost);
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return CURLE_HTTP_PORT_FAILED;
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}
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return CURLE_OK;
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} /* end of device selection support */
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#endif /* end of HAVE_INET_NTOA */
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#endif /* end of not WIN32 */
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return CURLE_HTTP_PORT_FAILED;
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}
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static
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int socketerror(int sockfd)
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{
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int err = 0;
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socklen_t errSize = sizeof(err);
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if( -1 == getsockopt(sockfd, SOL_SOCKET, SO_ERROR,
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(void *)&err, &errSize))
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err = Curl_ourerrno();
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return err;
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}
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/*
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* Curl_is_connected() is used from the multi interface to check if the
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* firstsocket has connected.
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*/
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CURLcode Curl_is_connected(struct connectdata *conn,
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int sockfd,
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bool *connected)
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{
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int rc;
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struct SessionHandle *data = conn->data;
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*connected = FALSE; /* a very negative world view is best */
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if(data->set.timeout || data->set.connecttimeout) {
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/* there is a timeout set */
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/* Evaluate in milliseconds how much time that has passed */
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long has_passed = Curl_tvdiff(Curl_tvnow(), data->progress.start);
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/* subtract the most strict timeout of the ones */
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if(data->set.timeout && data->set.connecttimeout) {
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if (data->set.timeout < data->set.connecttimeout)
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has_passed -= data->set.timeout*1000;
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else
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has_passed -= data->set.connecttimeout*1000;
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}
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else if(data->set.timeout)
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has_passed -= data->set.timeout*1000;
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else
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has_passed -= data->set.connecttimeout*1000;
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if(has_passed > 0 ) {
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/* time-out, bail out, go home */
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failf(data, "Connection time-out");
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return CURLE_OPERATION_TIMEOUTED;
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}
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}
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if(conn->bits.tcpconnect) {
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/* we are connected already! */
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*connected = TRUE;
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return CURLE_OK;
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}
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/* check for connect without timeout as we want to return immediately */
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rc = waitconnect(sockfd, 0);
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if(0 == rc) {
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int err = socketerror(sockfd);
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if ((0 == err) || (EISCONN == err)) {
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/* we are connected, awesome! */
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*connected = TRUE;
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return CURLE_OK;
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}
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/* nope, not connected for real */
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failf(data, "Connection failed, socket error: %d", err);
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return CURLE_COULDNT_CONNECT;
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}
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else if(1 != rc) {
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int error = Curl_ourerrno();
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failf(data, "Failed connect to %s:%d, errno: %d",
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conn->hostname, conn->port, error);
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return CURLE_COULDNT_CONNECT;
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}
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/*
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* If the connection phase is "done" here, we should attempt to connect
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* to the "next address" in the Curl_hostaddr structure that we resolved
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* before. But we don't have that struct around anymore and we can't just
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* keep a pointer since the cache might in fact have gotten pruned by the
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* time we want to read this... Alas, we don't do this yet.
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*/
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return CURLE_OK;
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}
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/*
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* TCP connect to the given host with timeout, proxy or remote doesn't matter.
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* There might be more than one IP address to try out. Fill in the passed
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* pointer with the connected socket.
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*/
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CURLcode Curl_connecthost(struct connectdata *conn, /* context */
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struct Curl_dns_entry *remotehost, /* use this one */
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int port, /* connect to this */
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int *sockconn, /* the connected socket */
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Curl_ipconnect **addr, /* the one we used */
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bool *connected) /* really connected? */
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{
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struct SessionHandle *data = conn->data;
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int rc;
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int sockfd=-1;
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int aliasindex=0;
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char *hostname;
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struct timeval after;
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struct timeval before = Curl_tvnow();
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/*************************************************************
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* Figure out what maximum time we have left
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*************************************************************/
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long timeout_ms=300000; /* milliseconds, default to five minutes */
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*connected = FALSE; /* default to not connected */
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if(data->set.timeout || data->set.connecttimeout) {
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double has_passed;
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/* Evaluate in milliseconds how much time that has passed */
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has_passed = Curl_tvdiff(Curl_tvnow(), data->progress.start);
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#ifndef min
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#define min(a, b) ((a) < (b) ? (a) : (b))
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#endif
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/* get the most strict timeout of the ones converted to milliseconds */
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if(data->set.timeout && data->set.connecttimeout) {
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if (data->set.timeout < data->set.connecttimeout)
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timeout_ms = data->set.timeout*1000;
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else
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timeout_ms = data->set.connecttimeout*1000;
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}
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else if(data->set.timeout)
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timeout_ms = data->set.timeout*1000;
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else
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timeout_ms = data->set.connecttimeout*1000;
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/* subtract the passed time */
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timeout_ms -= (long)has_passed;
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if(timeout_ms < 0) {
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/* a precaution, no need to continue if time already is up */
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failf(data, "Connection time-out");
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return CURLE_OPERATION_TIMEOUTED;
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}
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}
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hostname = data->change.proxy?conn->proxyhost:conn->hostname;
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infof(data, "About to connect() to %s%s%s:%d\n",
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conn->bits.ipv6_ip?"[":"",
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hostname,
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conn->bits.ipv6_ip?"]":"",
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port);
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#ifdef ENABLE_IPV6
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/*
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* Connecting with IPv6 support is so much easier and cleanly done
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*/
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{
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struct addrinfo *ai;
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port =0; /* prevent compiler warning */
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for (ai = remotehost->addr; ai; ai = ai->ai_next, aliasindex++) {
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sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
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if (sockfd < 0)
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continue;
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if(conn->data->set.device) {
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/* user selected to bind the outgoing socket to a specified "device"
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before doing connect */
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CURLcode res = bindlocal(conn, sockfd);
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if(res)
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return res;
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}
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/* set socket non-blocking */
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Curl_nonblock(sockfd, TRUE);
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rc = connect(sockfd, ai->ai_addr, ai->ai_addrlen);
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if(-1 == rc) {
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int error=Curl_ourerrno();
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switch (error) {
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case EINPROGRESS:
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case EWOULDBLOCK:
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#if defined(EAGAIN) && EAGAIN != EWOULDBLOCK
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/* On some platforms EAGAIN and EWOULDBLOCK are the
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* same value, and on others they are different, hence
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* the odd #if
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*/
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case EAGAIN:
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#endif
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case EINTR:
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/* asynchronous connect, wait for connect or timeout */
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if(data->state.used_interface == Curl_if_multi)
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/* don't hang when doing multi */
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timeout_ms = 0;
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rc = waitconnect(sockfd, timeout_ms);
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break;
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case ECONNREFUSED: /* no one listening */
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default:
|
|
/* unknown error, fallthrough and try another address! */
|
|
failf(data, "Failed connect to %s: %d", hostname, error);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if(0 == rc) {
|
|
/* we might be connected, if the socket says it is OK! Ask it! */
|
|
int err;
|
|
|
|
err = socketerror(sockfd);
|
|
if ((0 == err) || (EISCONN == err)) {
|
|
/* we are connected, awesome! */
|
|
*connected = TRUE; /* this is truly a connect */
|
|
break;
|
|
}
|
|
failf(data, "socket error: %d", err);
|
|
/* we are _not_ connected, it was a false alert, continue please */
|
|
}
|
|
else if(2 == rc)
|
|
/* waitconnect() returned error */
|
|
;
|
|
else if(data->state.used_interface == Curl_if_multi) {
|
|
/* When running the multi interface, we bail out here */
|
|
rc = 0;
|
|
break;
|
|
}
|
|
|
|
/* connect failed or timed out */
|
|
sclose(sockfd);
|
|
sockfd = -1;
|
|
|
|
/* get a new timeout for next attempt */
|
|
after = Curl_tvnow();
|
|
timeout_ms -= Curl_tvdiff(after, before);
|
|
if(timeout_ms < 0) {
|
|
failf(data, "connect() timed out!");
|
|
return CURLE_OPERATION_TIMEOUTED;
|
|
}
|
|
before = after;
|
|
continue;
|
|
}
|
|
if (sockfd < 0)
|
|
return CURLE_COULDNT_CONNECT;
|
|
|
|
/* leave the socket in non-blocking mode */
|
|
|
|
if(addr)
|
|
*addr = ai; /* the address we ended up connected to */
|
|
}
|
|
#else
|
|
/*
|
|
* Connecting with IPv4-only support
|
|
*/
|
|
if(!remotehost->addr->h_addr_list[0]) {
|
|
/* If there is no addresses in the address list, then we return
|
|
error right away */
|
|
failf(data, "no address available");
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
/* create an IPv4 TCP socket */
|
|
sockfd = socket(AF_INET, SOCK_STREAM, 0);
|
|
if(-1 == sockfd) {
|
|
failf(data, "couldn't create socket");
|
|
return CURLE_COULDNT_CONNECT; /* big time error */
|
|
}
|
|
|
|
if(conn->data->set.device) {
|
|
/* user selected to bind the outgoing socket to a specified "device"
|
|
before doing connect */
|
|
CURLcode res = bindlocal(conn, sockfd);
|
|
if(res)
|
|
return res;
|
|
}
|
|
|
|
/* Convert socket to non-blocking type */
|
|
Curl_nonblock(sockfd, TRUE);
|
|
|
|
/* This is the loop that attempts to connect to all IP-addresses we
|
|
know for the given host. One by one. */
|
|
for(rc=-1, aliasindex=0;
|
|
rc && (struct in_addr *)remotehost->addr->h_addr_list[aliasindex];
|
|
aliasindex++) {
|
|
struct sockaddr_in serv_addr;
|
|
|
|
/* do this nasty work to do the connect */
|
|
memset((char *) &serv_addr, '\0', sizeof(serv_addr));
|
|
memcpy((char *)&(serv_addr.sin_addr),
|
|
(struct in_addr *)remotehost->addr->h_addr_list[aliasindex],
|
|
sizeof(struct in_addr));
|
|
serv_addr.sin_family = remotehost->addr->h_addrtype;
|
|
serv_addr.sin_port = htons((unsigned short)port);
|
|
|
|
rc = connect(sockfd, (struct sockaddr *)&serv_addr,
|
|
sizeof(serv_addr));
|
|
|
|
if(-1 == rc) {
|
|
int error=Curl_ourerrno();
|
|
|
|
switch (error) {
|
|
case EINPROGRESS:
|
|
case EWOULDBLOCK:
|
|
#if defined(EAGAIN) && EAGAIN != EWOULDBLOCK
|
|
/* On some platforms EAGAIN and EWOULDBLOCK are the
|
|
* same value, and on others they are different, hence
|
|
* the odd #if
|
|
*/
|
|
case EAGAIN:
|
|
#endif
|
|
/* asynchronous connect, wait for connect or timeout */
|
|
if(data->state.used_interface == Curl_if_multi)
|
|
/* don't hang when doing multi */
|
|
timeout_ms = 0;
|
|
|
|
rc = waitconnect(sockfd, timeout_ms);
|
|
break;
|
|
default:
|
|
/* unknown error, fallthrough and try another address! */
|
|
failf(data, "Failed to connect to %s IP number %d: %d",
|
|
hostname, aliasindex+1, error);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* The '1 == rc' comes from the waitconnect(), and not from connect().
|
|
We can be sure of this since connect() cannot return 1. */
|
|
if((1 == rc) && (data->state.used_interface == Curl_if_multi)) {
|
|
/* Timeout when running the multi interface, we return here with a
|
|
CURLE_OK return code. */
|
|
rc = 0;
|
|
break;
|
|
}
|
|
|
|
if(0 == rc) {
|
|
int err = socketerror(sockfd);
|
|
if ((0 == err) || (EISCONN == err)) {
|
|
/* we are connected, awesome! */
|
|
*connected = TRUE; /* this is a true connect */
|
|
break;
|
|
}
|
|
/* nope, not connected for real */
|
|
rc = -1;
|
|
}
|
|
|
|
if(0 != rc) {
|
|
/* get a new timeout for next attempt */
|
|
after = Curl_tvnow();
|
|
timeout_ms -= Curl_tvdiff(after, before);
|
|
if(timeout_ms < 0) {
|
|
failf(data, "Connect timeout on IP number %d", aliasindex+1);
|
|
break;
|
|
}
|
|
before = after;
|
|
continue; /* try next address */
|
|
}
|
|
break;
|
|
}
|
|
if(0 != rc) {
|
|
/* no good connect was made */
|
|
sclose(sockfd);
|
|
*sockconn = -1;
|
|
failf(data, "Connect failed");
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
|
|
/* leave the socket in non-blocking mode */
|
|
|
|
if(addr)
|
|
/* this is the address we've connected to */
|
|
*addr = (struct in_addr *)remotehost->addr->h_addr_list[aliasindex];
|
|
#endif
|
|
|
|
/* allow NULL-pointers to get passed in */
|
|
if(sockconn)
|
|
*sockconn = sockfd; /* the socket descriptor we've connected */
|
|
|
|
return CURLE_OK;
|
|
}
|
|
|