C++ Curl_tvnow函数代码示例

/*
 * singleipconnect()
 *
 * Note that even on connect fail it returns CURLE_OK, but with 'sock' set to
 * CURL_SOCKET_BAD. Other errors will however return proper errors.
 *
 * singleipconnect() connects to the given IP only, and it may return without
 * having connected if used from the multi interface.
 */
static CURLcode
singleipconnect(struct connectdata *conn,
                const Curl_addrinfo *ai,
                long timeout_ms,
                curl_socket_t *sockp,
                bool *connected)
{
  struct Curl_sockaddr_ex addr;
  int rc;
  int error = 0;
  bool isconnected = FALSE;
  struct SessionHandle *data = conn->data;
  curl_socket_t sockfd;
  CURLcode res = CURLE_OK;

  *sockp = CURL_SOCKET_BAD;
  *connected = FALSE; /* default is not connected */

  res = Curl_socket(conn, ai, &addr, &sockfd);
  if(res)
    return res;

  /* store remote address and port used in this connection attempt */
  if(!getaddressinfo((struct sockaddr*)&addr.sa_addr,
                     conn->primary_ip, &conn->primary_port)) {
    /* malformed address or bug in inet_ntop, try next address */
    error = ERRNO;
    failf(data, "sa_addr inet_ntop() failed with errno %d: %s",
          error, Curl_strerror(conn, error));
    Curl_closesocket(conn, sockfd);
    return CURLE_OK;
  }
  memcpy(conn->ip_addr_str, conn->primary_ip, MAX_IPADR_LEN);
  infof(data, "  Trying %s...\n", conn->ip_addr_str);

  Curl_persistconninfo(conn);

  if(data->set.tcp_nodelay)
    tcpnodelay(conn, sockfd);

  nosigpipe(conn, sockfd);

  Curl_sndbufset(sockfd);

  if(data->set.fsockopt) {
    /* activate callback for setting socket options */
    error = data->set.fsockopt(data->set.sockopt_client,
                               sockfd,
                               CURLSOCKTYPE_IPCXN);

    if(error == CURL_SOCKOPT_ALREADY_CONNECTED)
      isconnected = TRUE;
    else if(error) {
      Curl_closesocket(conn, sockfd); /* close the socket and bail out */
      return CURLE_ABORTED_BY_CALLBACK;
    }
  }

  /* possibly bind the local end to an IP, interface or port */
  res = bindlocal(conn, sockfd, addr.family);
  if(res) {
    Curl_closesocket(conn, sockfd); /* close socket and bail out */
    return res;
  }

  /* set socket non-blocking */
  curlx_nonblock(sockfd, TRUE);

  /* Connect TCP sockets, bind UDP */
  if(!isconnected && (conn->socktype == SOCK_STREAM)) {
    rc = connect(sockfd, &addr.sa_addr, addr.addrlen);
    if(-1 == rc)
      error = SOCKERRNO;
    conn->connecttime = Curl_tvnow();
    if(conn->num_addr > 1)
      Curl_expire(data, conn->timeoutms_per_addr);
  }
  else
    rc = 0;

  if(-1 == rc) {
    switch (error) {
    case EINPROGRESS:
    case EWOULDBLOCK:
#if defined(EAGAIN)
#if (EAGAIN) != (EWOULDBLOCK)
      /* On some platforms EAGAIN and EWOULDBLOCK are the
       * same value, and on others they are different, hence
       * the odd #if
       */
    case EAGAIN:
//.........这里部分代码省略.........

/***********************************************************************
 *
 * Curl_pp_vsendf()
 *
 * Send the formated string as a command to a pingpong server. Note that
 * the string should not have any CRLF appended, as this function will
 * append the necessary things itself.
 *
 * made to never block
 */
CURLcode Curl_pp_vsendf(struct pingpong *pp,
                        const char *fmt,
                        va_list args)
{
  ssize_t bytes_written;
  size_t write_len;
  char *fmt_crlf;
  char *s;
  CURLcode result;
  struct connectdata *conn = pp->conn;
  struct Curl_easy *data = conn->data;

#ifdef HAVE_GSSAPI
  enum protection_level data_sec = conn->data_prot;
#endif

  DEBUGASSERT(pp->sendleft == 0);
  DEBUGASSERT(pp->sendsize == 0);
  DEBUGASSERT(pp->sendthis == NULL);

  fmt_crlf = aprintf("%s\r\n", fmt); /* append a trailing CRLF */
  if(!fmt_crlf)
    return CURLE_OUT_OF_MEMORY;

  s = vaprintf(fmt_crlf, args); /* trailing CRLF appended */
  free(fmt_crlf);
  if(!s)
    return CURLE_OUT_OF_MEMORY;

  bytes_written = 0;
  write_len = strlen(s);

  Curl_pp_init(pp);

  result = Curl_convert_to_network(data, s, write_len);
  /* Curl_convert_to_network calls failf if unsuccessful */
  if(result) {
    free(s);
    return result;
  }

#ifdef HAVE_GSSAPI
  conn->data_prot = PROT_CMD;
#endif
  result = Curl_write(conn, conn->sock[FIRSTSOCKET], s, write_len,
                     &bytes_written);
#ifdef HAVE_GSSAPI
  DEBUGASSERT(data_sec > PROT_NONE && data_sec < PROT_LAST);
  conn->data_prot = data_sec;
#endif

  if(result) {
    free(s);
    return result;
  }

  if(conn->data->set.verbose)
    Curl_debug(conn->data, CURLINFO_HEADER_OUT,
               s, (size_t)bytes_written, conn);

  if(bytes_written != (ssize_t)write_len) {
    /* the whole chunk was not sent, keep it around and adjust sizes */
    pp->sendthis = s;
    pp->sendsize = write_len;
    pp->sendleft = write_len - bytes_written;
  }
  else {
    free(s);
    pp->sendthis = NULL;
    pp->sendleft = pp->sendsize = 0;
    pp->response = Curl_tvnow();
  }

  return CURLE_OK;
}

//.........这里部分代码省略.........
	connssl->handle = SSL_new( connssl->ctx );
	SSL_set_connect_state( connssl->handle );

	connssl->server_cert = 0x0;

	if ( !conn->bits.reuse ) {
		/* We're not re-using a connection, check if there's a cached ID we
		   can/should use here! */
		if ( !Get_SSL_Session( conn, &ssl_sessionid ) ) {
			/* we got a session id, use it! */
			SSL_set_session( connssl->handle, ssl_sessionid );
			/* Informational message */
			infof( data, "SSL re-using session ID\n" );
		}
	}

	/* pass the raw socket into the SSL layers */
	SSL_set_fd( connssl->handle, sockfd );

	while ( 1 ) {
		fd_set writefd;
		fd_set readfd;
		struct timeval interval;
		long timeout_ms;

		/* Find out if any timeout is set. If not, use 300 seconds.
		   Otherwise, figure out the most strict timeout of the two possible one
		   and then how much time that has elapsed to know how much time we
		   allow for the connect call */
		if ( data->set.timeout || data->set.connecttimeout ) {
			long has_passed;

			/* Evaluate in milliseconds how much time that has passed */
			has_passed = Curl_tvdiff( Curl_tvnow(), data->progress.start );

			/* get the most strict timeout of the ones converted to milliseconds */
			if ( data->set.timeout &&
				 ( data->set.timeout > data->set.connecttimeout ) ) {
				timeout_ms = data->set.timeout * 1000;
			} else {
				timeout_ms = data->set.connecttimeout * 1000;
			}

			/* subtract the passed time */
			timeout_ms -= has_passed;

			if ( timeout_ms < 0 ) {
				/* a precaution, no need to continue if time already is up */
				failf( data, "SSL connection timeout" );
				return CURLE_OPERATION_TIMEOUTED;
			}
		} else {
			/* no particular time-out has been set */
			timeout_ms = DEFAULT_CONNECT_TIMEOUT;
		}


		FD_ZERO( &writefd );
		FD_ZERO( &readfd );

		err = SSL_connect( connssl->handle );

		/* 1  is fine
		   0  is "not successful but was shut down controlled"
		   <0 is "handshake was not successful, because a fatal error occurred" */
		if ( 1 != err ) {

/*
 * Curl_resolver_wait_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_resolver_wait_resolv(struct connectdata *conn,
                                   struct Curl_dns_entry **entry)
{
  CURLcode rc=CURLE_OK;
  struct SessionHandle *data = conn->data;
  long timeout;
  struct timeval now = Curl_tvnow();
  struct Curl_dns_entry *temp_entry;

  timeout = Curl_timeleft(data, &now, TRUE);
  if(!timeout)
    timeout = CURL_TIMEOUT_RESOLVE * 1000; /* default name resolve timeout */

  /* Wait for the name resolve query to complete. */
  for(;;) {
    struct timeval *tvp, tv, store;
    long timediff;
    int itimeout;
    int timeout_ms;

    itimeout = (timeout > (long)INT_MAX) ? INT_MAX : (int)timeout;

    store.tv_sec = itimeout/1000;
    store.tv_usec = (itimeout%1000)*1000;

    tvp = ares_timeout((ares_channel)data->state.resolver, &store, &tv);

    /* use the timeout period ares returned to us above if less than one
       second is left, otherwise just use 1000ms to make sure the progress
       callback gets called frequent enough */
    if(!tvp->tv_sec)
      timeout_ms = (int)(tvp->tv_usec/1000);
    else
      timeout_ms = 1000;

    waitperform(conn, timeout_ms);
    Curl_resolver_is_resolved(conn,&temp_entry);

    if(conn->async.done)
      break;

    if(Curl_pgrsUpdate(conn)) {
      rc = CURLE_ABORTED_BY_CALLBACK;
      timeout = -1; /* trigger the cancel below */
    }
    else {
      struct timeval now2 = Curl_tvnow();
      timediff = Curl_tvdiff(now2, now); /* spent time */
      timeout -= timediff?timediff:1; /* always deduct at least 1 */
      now = now2; /* for next loop */
    }
    if(timeout < 0) {
      /* our timeout, so we cancel the ares operation */
      ares_cancel((ares_channel)data->state.resolver);
      break;
    }
  }

  /* Operation complete, if the lookup was successful we now have the entry
     in the cache. */

  if(entry)
    *entry = conn->async.dns;

  if(rc)
    /* close the connection, since we can't return failure here without
       cleaning up this connection properly.
       TODO: remove this action from here, it is not a name resolver decision.
    */
    conn->bits.close = TRUE;

  return rc;
}

/***********************************************************************
 *
 * smtp_done()
 *
 * The DONE function. This does what needs to be done after a single DO has
 * performed.
 *
 * Input argument is already checked for validity.
 */
static CURLcode smtp_done(struct connectdata *conn, CURLcode status,
                          bool premature)
{
  CURLcode result = CURLE_OK;
  struct SessionHandle *data = conn->data;
  struct SMTP *smtp = data->state.proto.smtp;
  ssize_t bytes_written;

  (void)premature;

  if(!smtp)
    /* When the easy handle is removed from the multi interface while libcurl
       is still trying to resolve the host name, the SMTP struct is not yet
       initialized. However, the removal action calls Curl_done() which in
       turn calls this function, so we simply return success. */
    return CURLE_OK;

  if(status) {
    conn->bits.close = TRUE; /* marked for closure */
    result = status;         /* use the already set error code */
  }
  else if(!data->set.connect_only) {
    struct smtp_conn *smtpc = &conn->proto.smtpc;
    struct pingpong *pp = &smtpc->pp;

    /* Send the end of block data */
    result = Curl_write(conn,
                        conn->writesockfd,  /* socket to send to */
                        SMTP_EOB,           /* buffer pointer */
                        SMTP_EOB_LEN,       /* buffer size */
                        &bytes_written);    /* actually sent away */

    if(result)
      return result;

    if(bytes_written != SMTP_EOB_LEN) {
      /* The whole chunk was not sent so keep it around and adjust the
         pingpong structure accordingly */
      pp->sendthis = strdup(SMTP_EOB);
      pp->sendsize = SMTP_EOB_LEN;
      pp->sendleft = SMTP_EOB_LEN - bytes_written;
    }
    else
      /* Successfully sent so adjust the response timeout relative to now */
      pp->response = Curl_tvnow();

    state(conn, SMTP_POSTDATA);

    /* Run the state-machine

       TODO: when the multi interface is used, this _really_ should be using
       the smtp_multi_statemach function but we have no general support for
       non-blocking DONE operations, not in the multi state machine and with
       Curl_done() invokes on several places in the code!
    */
    result = smtp_block_statemach(conn);
  }

  /* Clear the transfer mode for the next request */
  smtp->transfer = FTPTRANSFER_BODY;

  return result;
}

/*
 * singleipconnect()
 *
 * Note that even on connect fail it returns CURLE_OK, but with 'sock' set to
 * CURL_SOCKET_BAD. Other errors will however return proper errors.
 *
 * singleipconnect() connects to the given IP only, and it may return without
 * having connected.
 */
static CURLcode singleipconnect(struct connectdata *conn,
                                const Curl_addrinfo *ai,
                                curl_socket_t *sockp)
{
  struct Curl_sockaddr_ex addr;
  int rc = -1;
  int error = 0;
  bool isconnected = FALSE;
  struct SessionHandle *data = conn->data;
  curl_socket_t sockfd;
  CURLcode result;
  char ipaddress[MAX_IPADR_LEN];
  long port;
  bool is_tcp;

  *sockp = CURL_SOCKET_BAD;

  result = Curl_socket(conn, ai, &addr, &sockfd);
  if(result)
    /* Failed to create the socket, but still return OK since we signal the
       lack of socket as well. This allows the parent function to keep looping
       over alternative addresses/socket families etc. */
    return CURLE_OK;

  /* store remote address and port used in this connection attempt */
  if(!getaddressinfo((struct sockaddr*)&addr.sa_addr,
                     ipaddress, &port)) {
    /* malformed address or bug in inet_ntop, try next address */
    error = ERRNO;
    failf(data, "sa_addr inet_ntop() failed with errno %d: %s",
          error, Curl_strerror(conn, error));
    Curl_closesocket(conn, sockfd);
    return CURLE_OK;
  }
  infof(data, "  Trying %s...\n", ipaddress);

#ifdef ENABLE_IPV6
  is_tcp = (addr.family == AF_INET || addr.family == AF_INET6) &&
    addr.socktype == SOCK_STREAM;
#else
  is_tcp = (addr.family == AF_INET) && addr.socktype == SOCK_STREAM;
#endif
  if(is_tcp && data->set.tcp_nodelay)
    Curl_tcpnodelay(conn, sockfd);

  nosigpipe(conn, sockfd);

  Curl_sndbufset(sockfd);

  if(is_tcp && data->set.tcp_keepalive)
    tcpkeepalive(data, sockfd);

  if(data->set.fsockopt) {
    /* activate callback for setting socket options */
    error = data->set.fsockopt(data->set.sockopt_client,
                               sockfd,
                               CURLSOCKTYPE_IPCXN);

    if(error == CURL_SOCKOPT_ALREADY_CONNECTED)
      isconnected = TRUE;
    else if(error) {
      Curl_closesocket(conn, sockfd); /* close the socket and bail out */
      return CURLE_ABORTED_BY_CALLBACK;
    }
  }

  /* possibly bind the local end to an IP, interface or port */
  if(addr.family == AF_INET
#ifdef ENABLE_IPV6
     || addr.family == AF_INET6
#endif
    ) {
    result = bindlocal(conn, sockfd, addr.family,
                       Curl_ipv6_scope((struct sockaddr*)&addr.sa_addr));
    if(result) {
      Curl_closesocket(conn, sockfd); /* close socket and bail out */
      if(result == CURLE_UNSUPPORTED_PROTOCOL) {
        /* The address family is not supported on this interface.
           We can continue trying addresses */
        return CURLE_COULDNT_CONNECT;
      }
      return result;
    }
  }

  /* set socket non-blocking */
  (void)curlx_nonblock(sockfd, TRUE);

  conn->connecttime = Curl_tvnow();
  if(conn->num_addr > 1)
    Curl_expire_latest(data, conn->timeoutms_per_addr);
//.........这里部分代码省略.........

static CURLcode file_upload(struct connectdata *conn)
{
  struct FILEPROTO *file = conn->data->state.proto.file;
  const char *dir = strchr(file->path, DIRSEP);
  FILE *fp;
  CURLcode res=CURLE_OK;
  struct SessionHandle *data = conn->data;
  char *buf = data->state.buffer;
  size_t nread;
  size_t nwrite;
  curl_off_t bytecount = 0;
  struct timeval now = Curl_tvnow();
  struct_stat file_stat;
  const char* buf2;

  /*
   * Since FILE: doesn't do the full init, we need to provide some extra
   * assignments here.
   */
  conn->fread_func = data->set.fread_func;
  conn->fread_in = data->set.in;
  conn->data->req.upload_fromhere = buf;

  if(!dir)
    return CURLE_FILE_COULDNT_READ_FILE; /* fix: better error code */

  if(!dir[1])
     return CURLE_FILE_COULDNT_READ_FILE; /* fix: better error code */

  if(data->state.resume_from)
    fp = fopen( file->path, "ab" );
  else {
    int fd;

#ifdef DOS_FILESYSTEM
    fd = open(file->path, O_WRONLY|O_CREAT|O_TRUNC|O_BINARY,
              conn->data->set.new_file_perms);
#else
    fd = open(file->path, O_WRONLY|O_CREAT|O_TRUNC,
              conn->data->set.new_file_perms);
#endif
    if(fd < 0) {
      failf(data, "Can't open %s for writing", file->path);
      return CURLE_WRITE_ERROR;
    }
    fp = fdopen(fd, "wb");
  }

  if(!fp) {
    failf(data, "Can't open %s for writing", file->path);
    return CURLE_WRITE_ERROR;
  }

  if(-1 != data->set.infilesize)
    /* known size of data to "upload" */
    Curl_pgrsSetUploadSize(data, data->set.infilesize);

  /* treat the negative resume offset value as the case of "-" */
  if(data->state.resume_from < 0) {
    if(stat(file->path, &file_stat)) {
      fclose(fp);
      failf(data, "Can't get the size of %s", file->path);
      return CURLE_WRITE_ERROR;
    }
    else
      data->state.resume_from = (curl_off_t)file_stat.st_size;
  }

  while(res == CURLE_OK) {
    int readcount;
    res = Curl_fillreadbuffer(conn, BUFSIZE, &readcount);
    if(res)
      break;

    if(readcount <= 0)  /* fix questionable compare error. curlvms */
      break;

    nread = (size_t)readcount;

    /*skip bytes before resume point*/
    if(data->state.resume_from) {
      if( (curl_off_t)nread <= data->state.resume_from ) {
        data->state.resume_from -= nread;
        nread = 0;
        buf2 = buf;
      }
      else {
        buf2 = buf + data->state.resume_from;
        nread -= (size_t)data->state.resume_from;
        data->state.resume_from = 0;
      }
    }
    else
      buf2 = buf;

    /* write the data to the target */
    nwrite = fwrite(buf2, 1, nread, fp);
    if(nwrite != nread) {
      res = CURLE_SEND_ERROR;
      break;
//.........这里部分代码省略.........

CURLcode Curl_output_digest(struct connectdata *conn,
                            bool proxy,
                            unsigned char *request,
                            unsigned char *uripath)
{
  /* We have a Digest setup for this, use it!  Now, to get all the details for
     this sorted out, I must urge you dear friend to read up on the RFC2617
     section 3.2.2, */
  unsigned char md5buf[16]; /* 16 bytes/128 bits */
  unsigned char request_digest[33];
  unsigned char *md5this;
  unsigned char *ha1;
  unsigned char ha2[33];/* 32 digits and 1 zero byte */
  char cnoncebuf[7];
  char *cnonce;
  char *tmp = NULL;
  struct timeval now;

  char **allocuserpwd;
  char *userp;
  char *passwdp;
  struct auth *authp;

  struct SessionHandle *data = conn->data;
  struct digestdata *d;

  if(proxy) {
    d = &data->state.proxydigest;
    allocuserpwd = &conn->allocptr.proxyuserpwd;
    userp = conn->proxyuser;
    passwdp = conn->proxypasswd;
    authp = &data->state.authproxy;
  }
  else {
    d = &data->state.digest;
    allocuserpwd = &conn->allocptr.userpwd;
    userp = conn->user;
    passwdp = conn->passwd;
    authp = &data->state.authhost;
  }

  /* not set means empty */
  if(!userp)
    userp=(char *)"";

  if(!passwdp)
    passwdp=(char *)"";

  if(!d->nonce) {
    authp->done = FALSE;
    return CURLE_OK;
  }
  authp->done = TRUE;

  if(!d->nc)
    d->nc = 1;

  if(!d->cnonce) {
    /* Generate a cnonce */
    now = Curl_tvnow();
    snprintf(cnoncebuf, sizeof(cnoncebuf), "%06ld", now.tv_sec);
    if(Curl_base64_encode(cnoncebuf, strlen(cnoncebuf), &cnonce))
      d->cnonce = cnonce;
    else
      return CURLE_OUT_OF_MEMORY;
  }

  /*
    if the algorithm is "MD5" or unspecified (which then defaults to MD5):

    A1 = unq(username-value) ":" unq(realm-value) ":" passwd

    if the algorithm is "MD5-sess" then:

    A1 = H( unq(username-value) ":" unq(realm-value) ":" passwd )
         ":" unq(nonce-value) ":" unq(cnonce-value)
  */

  md5this = (unsigned char *)
    aprintf("%s:%s:%s", userp, d->realm, passwdp);
  if(!md5this)
    return CURLE_OUT_OF_MEMORY;
  Curl_md5it(md5buf, md5this);
  free(md5this); /* free this again */

  ha1 = (unsigned char *)malloc(33); /* 32 digits and 1 zero byte */
  if(!ha1)
    return CURLE_OUT_OF_MEMORY;

  md5_to_ascii(md5buf, ha1);

  if(d->algo == CURLDIGESTALGO_MD5SESS) {
    /* nonce and cnonce are OUTSIDE the hash */
    tmp = aprintf("%s:%s:%s", ha1, d->nonce, d->cnonce);
    free(ha1);
    if(!tmp)
      return CURLE_OUT_OF_MEMORY;
    ha1 = (unsigned char *)tmp;
  }

//.........这里部分代码省略.........

/*
 * 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;
  struct timeval now = Curl_tvnow();

  /* 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;
  else
    timeout = CURL_TIMEOUT_RESOLVE * 1000; /* default name resolve timeout */

  /* Wait for the name resolve query to complete. */
  while(1) {
    struct timeval *tvp, tv, store;
    long timediff;
    int itimeout;

    itimeout = (timeout > (long)INT_MAX) ? INT_MAX : (int)timeout;

    store.tv_sec = itimeout/1000;
    store.tv_usec = (itimeout%1000)*1000;

    tvp = ares_timeout(data->state.areschannel, &store, &tv);

    /* use the timeout period ares returned to us above */
    ares_waitperform(conn, (int)(tvp->tv_sec * 1000 + tvp->tv_usec/1000));

    if(conn->async.done)
      break;

    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_COULDNT_RESOLVE_HOST;
    }
    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;
}

CURLcode Curl_is_connected(struct connectdata *conn,
                           int sockindex,
                           bool *connected)
{
  struct SessionHandle *data = conn->data;
  CURLcode code = CURLE_OK;
  long allow = DEFAULT_CONNECT_TIMEOUT;
  int error = 0;
  struct timeval now;
  int result;
  int i;

  DEBUGASSERT(sockindex >= FIRSTSOCKET && sockindex <= SECONDARYSOCKET);

  *connected = FALSE; /* a very negative world view is best */

  if(conn->bits.tcpconnect[sockindex]) {
    /* we are connected already! */
    *connected = TRUE;
    return CURLE_OK;
  }

  now = Curl_tvnow();

  /* figure out how long time we have left to connect */
  allow = Curl_timeleft(data, &now, TRUE);

  if(allow < 0) {
    /* time-out, bail out, go home */
    failf(data, "Connection time-out");
    return CURLE_OPERATION_TIMEDOUT;
  }

  for(i=0; i<2; i++) {
    if(conn->tempsock[i] == CURL_SOCKET_BAD)
      continue;

#ifdef mpeix
    /* Call this function once now, and ignore the results. We do this to
       "clear" the error state on the socket so that we can later read it
       reliably. This is reported necessary on the MPE/iX operating system. */
    (void)verifyconnect(conn->tempsock[i], NULL);
#endif

    /* check socket for connect */
    result = Curl_socket_ready(CURL_SOCKET_BAD, conn->tempsock[i], 0);

    switch(result) {
    case 0: /* no connection yet */
      if(curlx_tvdiff(now, conn->connecttime) >= conn->timeoutms_per_addr) {
        infof(data, "After %ldms connect time, move on!\n",
              conn->timeoutms_per_addr);
        error = ETIMEDOUT;
      }
      break;

    case CURL_CSELECT_OUT:
      if(verifyconnect(conn->tempsock[i], &error)) {
        /* we are connected with TCP, awesome! */
        int other = i ^ 1;

        /* use this socket from now on */
        conn->sock[sockindex] = conn->tempsock[i];
        conn->ip_addr = conn->tempaddr[i];

        /* close the other socket, if open */
        if(conn->tempsock[other] != CURL_SOCKET_BAD) {
          if(conn->fclosesocket)
            conn->fclosesocket(conn->closesocket_client,
                               conn->tempsock[other]);
          else
            sclose(conn->tempsock[other]);
        }

        /* see if we need to do any proxy magic first once we connected */
        code = Curl_connected_proxy(conn, sockindex);
        if(code)
          return code;

        conn->bits.tcpconnect[sockindex] = TRUE;

        *connected = TRUE;
        if(sockindex == FIRSTSOCKET)
          Curl_pgrsTime(data, TIMER_CONNECT); /* connect done */
        Curl_updateconninfo(conn, conn->sock[sockindex]);
        Curl_verboseconnect(conn);

        return CURLE_OK;
      }
      else
        infof(data, "Connection failed\n");
      break;

    case CURL_CSELECT_ERR|CURL_CSELECT_OUT:
      (void)verifyconnect(conn->tempsock[i], &error);
      break;

    default:
      infof(data, "Whut?\n");
      return CURLE_OK;
//.........这里部分代码省略.........

//.........这里部分代码省略.........
  gnutls_transport_set_ptr(session,
                           (gnutls_transport_ptr)conn->sock[sockindex]);

  /* This might be a reconnect, so we check for a session ID in the cache
     to speed up things */

  if(!Curl_ssl_getsessionid(conn, &ssl_sessionid, &ssl_idsize)) {
    /* we got a session id, use it! */
    gnutls_session_set_data(session, ssl_sessionid, ssl_idsize);

    /* Informational message */
    infof (data, "SSL re-using session ID\n");
  }

  do {
    rc = gnutls_handshake(session);

    if((rc == GNUTLS_E_AGAIN) || (rc == GNUTLS_E_INTERRUPTED)) {
      long timeout_ms;
      long has_passed;

      if(data->set.timeout || data->set.connecttimeout) {
        /* get the most strict timeout of the ones converted to milliseconds */
        if(data->set.timeout &&
           (data->set.timeout>data->set.connecttimeout))
          timeout_ms = data->set.timeout*1000;
        else
          timeout_ms = data->set.connecttimeout*1000;
      }
      else
        timeout_ms = DEFAULT_CONNECT_TIMEOUT;

      /* Evaluate in milliseconds how much time that has passed */
      has_passed = Curl_tvdiff(Curl_tvnow(), data->progress.t_startsingle);

      /* subtract the passed time */
      timeout_ms -= has_passed;

      if(timeout_ms < 0) {
        /* a precaution, no need to continue if time already is up */
        failf(data, "SSL connection timeout");
        return CURLE_OPERATION_TIMEOUTED;
      }

      rc = Curl_select(conn->sock[sockindex],
                         conn->sock[sockindex], (int)timeout_ms);
      if(rc > 0)
        /* reabable or writable, go loop*/
        continue;
      else if(0 == rc) {
        /* timeout */
        failf(data, "SSL connection timeout");
        return CURLE_OPERATION_TIMEDOUT;
      }
      else {
        /* anything that gets here is fatally bad */
        failf(data, "select on SSL socket, errno: %d", Curl_ourerrno());
        return CURLE_SSL_CONNECT_ERROR;
      }
    }
    else
      break;
  } while(1);

  if (rc < 0) {
    failf(data, "gnutls_handshake() failed: %d", rc);

CURLcode Curl_connecthost(struct connectdata *conn,  /* context */
                          const struct Curl_dns_entry *remotehost,
                          bool *connected)           /* really connected? */
{
  struct SessionHandle *data = conn->data;
  struct timeval after;
  struct timeval before = Curl_tvnow();
  int i;

  /*************************************************************
   * Figure out what maximum time we have left
   *************************************************************/
  long timeout_ms;

  *connected = FALSE; /* default to not connected */

  /* get the timeout left */
  timeout_ms = Curl_timeleft(data, &before, TRUE);

  if(timeout_ms < 0) {
    /* a precaution, no need to continue if time already is up */
    failf(data, "Connection time-out");
    return CURLE_OPERATION_TIMEDOUT;
  }

  conn->num_addr = Curl_num_addresses(remotehost->addr);
  conn->tempaddr[0] = remotehost->addr;
  conn->tempaddr[1] = remotehost->addr;

  /* Below is the loop that attempts to connect to all IP-addresses we
   * know for the given host.
   * One by one, for each protocol, until one IP succeeds.
   */

  for(i=0; i<2; i++) {
    curl_socket_t sockfd = CURL_SOCKET_BAD;
    Curl_addrinfo *ai = conn->tempaddr[i];
    int family = i ? AF_INET6 : AF_INET;

    /* find first address for this address family, if any */
    while(ai && ai->ai_family != family)
      ai = ai->ai_next;

    /*
     * Connecting with a Curl_addrinfo chain
     */
    while(ai) {
      CURLcode res;

      /* Max time for the next connection attempt */
      conn->timeoutms_per_addr = ai->ai_next == NULL ?
                                 timeout_ms : timeout_ms / 2;

      /* start connecting to the IP curr_addr points to */
      res = singleipconnect(conn, ai, &sockfd, connected);
      if(res)
        return res;

      if(sockfd != CURL_SOCKET_BAD)
        break;

      /* 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_TIMEDOUT;
      }
      before = after;

      /* next addresses */
      do {
        ai = ai->ai_next;
      } while(ai && ai->ai_family != family);
    }  /* end of connect-to-each-address loop */

    conn->tempsock[i] = sockfd;
    conn->tempaddr[i] = ai;
  }

  if((conn->tempsock[0] == CURL_SOCKET_BAD) &&
     (conn->tempsock[1] == CURL_SOCKET_BAD)) {
    /* no good connect was made */
    failf(data, "couldn't connect to %s at %s:%ld",
          conn->bits.proxy?"proxy":"host",
          conn->bits.proxy?conn->proxy.name:conn->host.name, conn->port);
    return CURLE_COULDNT_CONNECT;
  }

  /* leave the socket in non-blocking mode */

  data->info.numconnects++; /* to track the number of connections made */

  return CURLE_OK;
}

CURLcode Curl_connecthost(struct connectdata *conn,  /* context */
                          struct Curl_dns_entry *remotehost, /* use this one */
                          curl_socket_t *sockconn,   /* the connected socket */
                          Curl_addrinfo **addr,      /* the one we used */
                          bool *connected)           /* really connected? */
{
  struct SessionHandle *data = conn->data;
  curl_socket_t sockfd = CURL_SOCKET_BAD;
  int aliasindex;
  int num_addr;
  Curl_addrinfo *ai;
  Curl_addrinfo *curr_addr;

  struct timeval after;
  struct timeval before = Curl_tvnow();

  /*************************************************************
   * Figure out what maximum time we have left
   *************************************************************/
  long timeout_ms= DEFAULT_CONNECT_TIMEOUT;
  long timeout_per_addr;

  *connected = FALSE; /* default to not connected */

  if(data->set.timeout || data->set.connecttimeout) {
    long has_passed;

    /* Evaluate in milliseconds how much time that has passed */
    has_passed = Curl_tvdiff(Curl_tvnow(), data->progress.t_startsingle);

#ifndef min
#define min(a, b)   ((a) < (b) ? (a) : (b))
#endif

    /* get the most strict timeout of the ones converted to milliseconds */
    if(data->set.timeout && data->set.connecttimeout) {
      if (data->set.timeout < data->set.connecttimeout)
        timeout_ms = data->set.timeout*1000;
      else
        timeout_ms = data->set.connecttimeout*1000;
    }
    else if(data->set.timeout)
      timeout_ms = data->set.timeout*1000;
    else
      timeout_ms = data->set.connecttimeout*1000;

    /* subtract the passed time */
    timeout_ms -= has_passed;

    if(timeout_ms < 0) {
      /* a precaution, no need to continue if time already is up */
      failf(data, "Connection time-out");
      return CURLE_OPERATION_TIMEOUTED;
    }
  }

  /* Max time for each address */
  num_addr = Curl_num_addresses(remotehost->addr);
  timeout_per_addr = timeout_ms / num_addr;

  ai = remotehost->addr;

  /* Below is the loop that attempts to connect to all IP-addresses we
   * know for the given host. One by one until one IP succeeds.
   */

  if(data->state.used_interface == Curl_if_multi)
    /* don't hang when doing multi */
    timeout_per_addr = 0;

  /*
   * Connecting with a Curl_addrinfo chain
   */
  for (curr_addr = ai, aliasindex=0; curr_addr;
       curr_addr = curr_addr->ai_next, aliasindex++) {

    /* start connecting to the IP curr_addr points to */
    sockfd = singleipconnect(conn, curr_addr, timeout_per_addr, connected);

    if(sockfd != CURL_SOCKET_BAD)
      break;

    /* 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;
  }  /* end of connect-to-each-address loop */

  if (sockfd == CURL_SOCKET_BAD) {
    /* no good connect was made */
    *sockconn = CURL_SOCKET_BAD;
    failf(data, "couldn't connect to host");
    return CURLE_COULDNT_CONNECT;
  }

  /* leave the socket in non-blocking mode */
//.........这里部分代码省略.........

CURLcode Curl_is_connected(struct connectdata *conn,
                           int sockindex,
                           bool *connected)
{
  int rc;
  struct SessionHandle *data = conn->data;
  CURLcode code = CURLE_OK;
  curl_socket_t sockfd = conn->sock[sockindex];
  long allow = DEFAULT_CONNECT_TIMEOUT;
  long has_passed;

  curlassert(sockindex >= FIRSTSOCKET && sockindex <= SECONDARYSOCKET);

  *connected = FALSE; /* a very negative world view is best */

  /* Evaluate in milliseconds how much time that has passed */
  has_passed = Curl_tvdiff(Curl_tvnow(), data->progress.t_startsingle);

  /* subtract the most strict timeout of the ones */
  if(data->set.timeout && data->set.connecttimeout) {
    if (data->set.timeout < data->set.connecttimeout)
      allow = data->set.timeout*1000;
    else
      allow = data->set.connecttimeout*1000;
  }
  else if(data->set.timeout) {
    allow = data->set.timeout*1000;
  }
  else if(data->set.connecttimeout) {
    allow = data->set.connecttimeout*1000;
  }

  if(has_passed > allow ) {
    /* time-out, bail out, go home */
    failf(data, "Connection time-out after %ld ms", has_passed);
    return CURLE_OPERATION_TIMEOUTED;
  }
  if(conn->bits.tcpconnect) {
    /* we are connected already! */
    *connected = TRUE;
    return CURLE_OK;
  }

  /* check for connect without timeout as we want to return immediately */
  rc = waitconnect(sockfd, 0);

  if(WAITCONN_CONNECTED == rc) {
    int error;
    if (verifyconnect(sockfd, &error)) {
      /* we are connected, awesome! */
      *connected = TRUE;
      return CURLE_OK;
    }
    /* nope, not connected for real */
    data->state.os_errno = error;
    infof(data, "Connection failed\n");
    if(trynextip(conn, sockindex, connected)) {
      code = CURLE_COULDNT_CONNECT;
    }
  }
  else if(WAITCONN_TIMEOUT != rc) {
    int error = 0;

    /* nope, not connected  */
    if (WAITCONN_FDSET_ERROR == rc) {
      verifyconnect(sockfd, &error);
      data->state.os_errno = error;
      infof(data, "%s\n",Curl_strerror(conn,error));
    }
    else
      infof(data, "Connection failed\n");

    if(trynextip(conn, sockindex, connected)) {
      error = Curl_ourerrno();
      data->state.os_errno = error;
      failf(data, "Failed connect to %s:%d; %s",
            conn->host.name, conn->port, Curl_strerror(conn,error));
      code = CURLE_COULDNT_CONNECT;
    }
  }
  /*
   * If the connection failed here, we should attempt to connect to the "next
   * address" for the given host.
   */

  return code;
}

static CURLcode file_upload(struct connectdata *conn)
{
  struct FILEPROTO *file = conn->data->req.protop;
  const char *dir = strchr(file->path, DIRSEP);
  int fd;
  int mode;
  CURLcode result = CURLE_OK;
  struct Curl_easy *data = conn->data;
  char *buf = data->state.buffer;
  size_t nread;
  size_t nwrite;
  curl_off_t bytecount = 0;
  struct timeval now = Curl_tvnow();
  struct_stat file_stat;
  const char *buf2;

  /*
   * Since FILE: doesn't do the full init, we need to provide some extra
   * assignments here.
   */
  conn->data->req.upload_fromhere = buf;

  if(!dir)
    return CURLE_FILE_COULDNT_READ_FILE; /* fix: better error code */

  if(!dir[1])
    return CURLE_FILE_COULDNT_READ_FILE; /* fix: better error code */

#ifdef O_BINARY
#define MODE_DEFAULT O_WRONLY|O_CREAT|O_BINARY
#else
#define MODE_DEFAULT O_WRONLY|O_CREAT
#endif

  if(data->state.resume_from)
    mode = MODE_DEFAULT|O_APPEND;
  else
    mode = MODE_DEFAULT|O_TRUNC;

  fd = open(file->path, mode, conn->data->set.new_file_perms);
  if(fd < 0) {
    failf(data, "Can't open %s for writing", file->path);
    return CURLE_WRITE_ERROR;
  }

  if(-1 != data->state.infilesize)
    /* known size of data to "upload" */
    Curl_pgrsSetUploadSize(data, data->state.infilesize);

  /* treat the negative resume offset value as the case of "-" */
  if(data->state.resume_from < 0) {
    if(fstat(fd, &file_stat)) {
      close(fd);
      failf(data, "Can't get the size of %s", file->path);
      return CURLE_WRITE_ERROR;
    }
    else
      data->state.resume_from = (curl_off_t)file_stat.st_size;
  }

  while(!result) {
    int readcount;
    result = Curl_fillreadbuffer(conn, BUFSIZE, &readcount);
    if(result)
      break;

    if(readcount <= 0)  /* fix questionable compare error. curlvms */
      break;

    nread = (size_t)readcount;

    /*skip bytes before resume point*/
    if(data->state.resume_from) {
      if((curl_off_t)nread <= data->state.resume_from) {
        data->state.resume_from -= nread;
        nread = 0;
        buf2 = buf;
      }
      else {
        buf2 = buf + data->state.resume_from;
        nread -= (size_t)data->state.resume_from;
        data->state.resume_from = 0;
      }
    }
    else
      buf2 = buf;

    /* write the data to the target */
    nwrite = write(fd, buf2, nread);
    if(nwrite != nread) {
      result = CURLE_SEND_ERROR;
      break;
    }

    bytecount += nread;

    Curl_pgrsSetUploadCounter(data, bytecount);

    if(Curl_pgrsUpdate(conn))
      result = CURLE_ABORTED_BY_CALLBACK;
//.........这里部分代码省略.........