connect.c

/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2016, 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 https://curl.haxx.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ***************************************************************************/

#include "curl_setup.h"

#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h> /* <netinet/tcp.h> may need it */
#endif
#ifdef HAVE_SYS_UN_H
#include <sys/un.h> /* for sockaddr_un */
#endif
#ifdef HAVE_NETINET_TCP_H
#include <netinet/tcp.h> /* for TCP_NODELAY */
#endif
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif

#if (defined(HAVE_IOCTL_FIONBIO) && defined(NETWARE))
#include <sys/filio.h>
#endif
#ifdef NETWARE
#undef in_addr_t
#define in_addr_t unsigned long
#endif
#ifdef __VMS
#include <in.h>
#include <inet.h>
#endif

#include "curl_printf.h"
#include "urldata.h"
#include "sendf.h"
#include "if2ip.h"
#include "strerror.h"
#include "connect.h"
#include "select.h"
#include "url.h" /* for Curl_safefree() */
#include "multiif.h"
#include "sockaddr.h" /* required for Curl_sockaddr_storage */
#include "inet_ntop.h"
#include "inet_pton.h"
#include "vtls/vtls.h" /* for Curl_ssl_check_cxn() */
#include "progress.h"
#include "warnless.h"
#include "conncache.h"
#include "multihandle.h"

/* The last #include files should be: */
#include "curl_memory.h"
#include "memdebug.h"

#ifdef __SYMBIAN32__
/* This isn't actually supported under Symbian OS */
#undef SO_NOSIGPIPE
#endif

static bool verifyconnect(curl_socket_t sockfd, int *error);

#if defined(__DragonFly__) || defined(HAVE_WINSOCK_H)
/* DragonFlyBSD and Windows use millisecond units */
#define KEEPALIVE_FACTOR(x) (x *= 1000)
#else
#define KEEPALIVE_FACTOR(x)
#endif

#if defined(HAVE_WINSOCK2_H) && !defined(SIO_KEEPALIVE_VALS)
#define SIO_KEEPALIVE_VALS    _WSAIOW(IOC_VENDOR,4)

struct tcp_keepalive {
  u_long onoff;
  u_long keepalivetime;
  u_long keepaliveinterval;
};
#endif

static void
tcpkeepalive(struct SessionHandle *data,
             curl_socket_t sockfd)
{
  int optval = data->set.tcp_keepalive?1:0;

  /* only set IDLE and INTVL if setting KEEPALIVE is successful */
  if(setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE,
        (void *)&optval, sizeof(optval)) < 0) {
    infof(data, "Failed to set SO_KEEPALIVE on fd %d\n", sockfd);
  }
  else {
#if defined(SIO_KEEPALIVE_VALS)
    struct tcp_keepalive vals;
    DWORD dummy;
    vals.onoff = 1;
    optval = curlx_sltosi(data->set.tcp_keepidle);
    KEEPALIVE_FACTOR(optval);
    vals.keepalivetime = optval;
    optval = curlx_sltosi(data->set.tcp_keepintvl);
    KEEPALIVE_FACTOR(optval);
    vals.keepaliveinterval = optval;
    if(WSAIoctl(sockfd, SIO_KEEPALIVE_VALS, (LPVOID) &vals, sizeof(vals),
                NULL, 0, &dummy, NULL, NULL) != 0) {
      infof(data, "Failed to set SIO_KEEPALIVE_VALS on fd %d: %d\n",
            (int)sockfd, WSAGetLastError());
    }
#else
#ifdef TCP_KEEPIDLE
    optval = curlx_sltosi(data->set.tcp_keepidle);
    KEEPALIVE_FACTOR(optval);
    if(setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPIDLE,
          (void *)&optval, sizeof(optval)) < 0) {
      infof(data, "Failed to set TCP_KEEPIDLE on fd %d\n", sockfd);
    }
#endif
#ifdef TCP_KEEPINTVL
    optval = curlx_sltosi(data->set.tcp_keepintvl);
    KEEPALIVE_FACTOR(optval);
    if(setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPINTVL,
          (void *)&optval, sizeof(optval)) < 0) {
      infof(data, "Failed to set TCP_KEEPINTVL on fd %d\n", sockfd);
    }
#endif
#ifdef TCP_KEEPALIVE
    /* Mac OS X style */
    optval = curlx_sltosi(data->set.tcp_keepidle);
    KEEPALIVE_FACTOR(optval);
    if(setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPALIVE,
          (void *)&optval, sizeof(optval)) < 0) {
      infof(data, "Failed to set TCP_KEEPALIVE on fd %d\n", sockfd);
    }
#endif
#endif
  }
}

static CURLcode
singleipconnect(struct connectdata *conn,
                const Curl_addrinfo *ai, /* start connecting to this */
                curl_socket_t *sock);

/*
 * Curl_timeleft() returns the amount of milliseconds left allowed for the
 * transfer/connection. If the value is negative, the timeout time has already
 * elapsed.
 *
 * The start time is stored in progress.t_startsingle - as set with
 * Curl_pgrsTime(..., TIMER_STARTSINGLE);
 *
 * If 'nowp' is non-NULL, it points to the current time.
 * 'duringconnect' is FALSE if not during a connect, as then of course the
 * connect timeout is not taken into account!
 *
 * @unittest: 1303
 */
long Curl_timeleft(struct SessionHandle *data,
                   struct timeval *nowp,
                   bool duringconnect)
{
  int timeout_set = 0;
  long timeout_ms = duringconnect?DEFAULT_CONNECT_TIMEOUT:0;
  struct timeval now;

  /* if a timeout is set, use the most restrictive one */

  if(data->set.timeout > 0)
    timeout_set |= 1;
  if(duringconnect && (data->set.connecttimeout > 0))
    timeout_set |= 2;

  switch (timeout_set) {
  case 1:
    timeout_ms = data->set.timeout;
    break;
  case 2: