1408 lines
39 KiB
C
1408 lines
39 KiB
C
const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.111 2011/12/10 17:26:30 fabiankeil Exp $";
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/*********************************************************************
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*
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* File : $Source: /cvsroot/ijbswa/current/jbsockets.c,v $
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*
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* Purpose : Contains wrappers for system-specific sockets code,
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* so that the rest of Junkbuster can be more
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* OS-independent. Contains #ifdefs to make this work
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* on many platforms.
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*
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* Copyright : Written by and Copyright (C) 2001-2011 the
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* Privoxy team. http://www.privoxy.org/
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*
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* Based on the Internet Junkbuster originally written
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* by and Copyright (C) 1997 Anonymous Coders and
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* Junkbusters Corporation. http://www.junkbusters.com
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*
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* This program is free software; you can redistribute it
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* and/or modify it under the terms of the GNU General
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* Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will
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* be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A
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* PARTICULAR PURPOSE. See the GNU General Public
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* License for more details.
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*
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* The GNU General Public License should be included with
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* this file. If not, you can view it at
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* http://www.gnu.org/copyleft/gpl.html
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* or write to the Free Software Foundation, Inc., 59
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* Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*********************************************************************/
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#include "config.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#ifdef _WIN32
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#ifndef STRICT
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#define STRICT
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#endif
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#include <windows.h>
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#include <sys/timeb.h>
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#include <io.h>
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#else
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#ifndef __OS2__
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#include <unistd.h>
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#endif
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <sys/ioctl.h>
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#include <netdb.h>
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#include <sys/socket.h>
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#ifndef __BEOS__
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#include <netinet/tcp.h>
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#ifndef __OS2__
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#include <arpa/inet.h>
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#endif
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#else
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#include <socket.h>
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#endif
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#if defined(__EMX__) || defined (__OS2__)
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#include <sys/select.h> /* OS/2/EMX needs a little help with select */
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#ifdef __OS2__
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#include <nerrno.h>
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#endif
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#endif
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#endif
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#ifdef FEATURE_CONNECTION_KEEP_ALIVE
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#ifdef HAVE_POLL
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#ifdef __GLIBC__
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#include <sys/poll.h>
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#else
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#include <poll.h>
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#endif /* def __GLIBC__ */
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#endif /* HAVE_POLL */
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#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
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#include "project.h"
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/* For mutex semaphores only */
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#include "jcc.h"
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#include "jbsockets.h"
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#include "filters.h"
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#include "errlog.h"
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/* Mac OSX doesn't define AI_NUMERICSESRV */
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#ifndef AI_NUMERICSERV
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#define AI_NUMERICSERV 0
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#endif
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const char jbsockets_h_rcs[] = JBSOCKETS_H_VERSION;
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/*
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* Maximum number of gethostbyname(_r) retries in case of
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* soft errors (TRY_AGAIN).
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* XXX: Does it make sense to make this a config option?
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*/
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#define MAX_DNS_RETRIES 10
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#define MAX_LISTEN_BACKLOG 128
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#ifdef HAVE_RFC2553
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static jb_socket rfc2553_connect_to(const char *host, int portnum, struct client_state *csp);
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#else
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static jb_socket no_rfc2553_connect_to(const char *host, int portnum, struct client_state *csp);
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#endif
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/*********************************************************************
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*
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* Function : connect_to
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*
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* Description : Open a socket and connect to it. Will check
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* that this is allowed according to ACL.
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*
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* Parameters :
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* 1 : host = hostname to connect to
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* 2 : portnum = port to connent on (XXX: should be unsigned)
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* 3 : csp = Current client state (buffers, headers, etc...)
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*
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* Returns : JB_INVALID_SOCKET => failure, else it is the socket
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* file descriptor.
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*
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*********************************************************************/
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jb_socket connect_to(const char *host, int portnum, struct client_state *csp)
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{
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jb_socket fd;
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int forwarded_connect_retries = 0;
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do
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{
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/*
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* XXX: The whole errno overloading is ridiculous and should
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* be replaced with something sane and thread safe
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*/
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/* errno = 0;*/
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#ifdef HAVE_RFC2553
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fd = rfc2553_connect_to(host, portnum, csp);
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#else
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fd = no_rfc2553_connect_to(host, portnum, csp);
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#endif
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if ((fd != JB_INVALID_SOCKET) || (errno == EINVAL)
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|| (csp->fwd == NULL)
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|| ((csp->fwd->forward_host == NULL) && (csp->fwd->type == SOCKS_NONE)))
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{
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break;
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}
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forwarded_connect_retries++;
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if (csp->config->forwarded_connect_retries != 0)
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{
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log_error(LOG_LEVEL_ERROR,
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"Attempt %d of %d to connect to %s failed. Trying again.",
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forwarded_connect_retries, csp->config->forwarded_connect_retries + 1, host);
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}
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} while (forwarded_connect_retries < csp->config->forwarded_connect_retries);
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return fd;
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}
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#ifdef HAVE_RFC2553
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/* Getaddrinfo implementation */
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static jb_socket rfc2553_connect_to(const char *host, int portnum, struct client_state *csp)
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{
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struct addrinfo hints, *result, *rp;
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char service[6];
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int retval;
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jb_socket fd;
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fd_set wfds;
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struct timeval timeout;
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#if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
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int flags;
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#endif
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int connect_failed;
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/*
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* XXX: Initializeing it here is only necessary
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* because not all situations are properly
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* covered yet.
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*/
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int socket_error = 0;
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#ifdef FEATURE_ACL
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struct access_control_addr dst[1];
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#endif /* def FEATURE_ACL */
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/* Don't leak memory when retrying. */
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freez(csp->error_message);
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freez(csp->http->host_ip_addr_str);
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retval = snprintf(service, sizeof(service), "%d", portnum);
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if ((-1 == retval) || (sizeof(service) <= retval))
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{
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log_error(LOG_LEVEL_ERROR,
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"Port number (%d) ASCII decimal representation doesn't fit into 6 bytes",
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portnum);
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csp->error_message = strdup("Invalid port number");
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csp->http->host_ip_addr_str = strdup("unknown");
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return(JB_INVALID_SOCKET);
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}
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memset((char *)&hints, 0, sizeof(hints));
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_flags = AI_NUMERICSERV; /* avoid service look-up */
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#ifdef AI_ADDRCONFIG
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hints.ai_flags |= AI_ADDRCONFIG;
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#endif
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if ((retval = getaddrinfo(host, service, &hints, &result)))
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{
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log_error(LOG_LEVEL_INFO,
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"Can not resolve %s: %s", host, gai_strerror(retval));
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/* XXX: Should find a better way to propagate this error. */
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errno = EINVAL;
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csp->error_message = strdup(gai_strerror(retval));
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csp->http->host_ip_addr_str = strdup("unknown");
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return(JB_INVALID_SOCKET);
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}
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csp->http->host_ip_addr_str = malloc(NI_MAXHOST);
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if (NULL == csp->http->host_ip_addr_str)
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{
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freeaddrinfo(result);
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log_error(LOG_LEVEL_ERROR,
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"Out of memory while getting the server IP address.");
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return JB_INVALID_SOCKET;
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}
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for (rp = result; rp != NULL; rp = rp->ai_next)
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{
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#ifdef FEATURE_ACL
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memcpy(&dst->addr, rp->ai_addr, rp->ai_addrlen);
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if (block_acl(dst, csp))
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{
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#ifdef __OS2__
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socket_error = errno = SOCEPERM;
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#else
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socket_error = errno = EPERM;
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#endif
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continue;
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}
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#endif /* def FEATURE_ACL */
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retval = getnameinfo(rp->ai_addr, rp->ai_addrlen,
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csp->http->host_ip_addr_str, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
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if (retval)
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{
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log_error(LOG_LEVEL_ERROR,
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"Failed to get the host name from the socket structure: %s",
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gai_strerror(retval));
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continue;
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}
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fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
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#ifdef _WIN32
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if (fd == JB_INVALID_SOCKET)
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#else
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if (fd < 0)
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#endif
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{
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continue;
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}
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#ifdef TCP_NODELAY
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{ /* turn off TCP coalescence */
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int mi = 1;
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setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
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}
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#endif /* def TCP_NODELAY */
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#if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
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if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
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{
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flags |= O_NDELAY;
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fcntl(fd, F_SETFL, flags);
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}
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#endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
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connect_failed = 0;
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while (connect(fd, rp->ai_addr, rp->ai_addrlen) == JB_INVALID_SOCKET)
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{
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#ifdef __OS2__
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errno = sock_errno();
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#endif /* __OS2__ */
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#ifdef _WIN32
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if (errno == WSAEINPROGRESS)
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#else /* ifndef _WIN32 */
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if (errno == EINPROGRESS)
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#endif /* ndef _WIN32 || __OS2__ */
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{
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break;
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}
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if (errno != EINTR)
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{
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socket_error = errno;
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close_socket(fd);
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connect_failed = 1;
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break;
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}
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}
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if (connect_failed)
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{
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continue;
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}
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#if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
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if (flags != -1)
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{
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flags &= ~O_NDELAY;
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fcntl(fd, F_SETFL, flags);
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}
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#endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
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/* wait for connection to complete */
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FD_ZERO(&wfds);
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FD_SET(fd, &wfds);
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memset(&timeout, 0, sizeof(timeout));
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timeout.tv_sec = 30;
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/* MS Windows uses int, not SOCKET, for the 1st arg of select(). Weird! */
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if ((select((int)fd + 1, NULL, &wfds, NULL, &timeout) > 0)
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&& FD_ISSET(fd, &wfds))
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{
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socklen_t optlen = sizeof(socket_error);
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if (!getsockopt(fd, SOL_SOCKET, SO_ERROR, &socket_error, &optlen))
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{
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if (!socket_error)
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{
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/* Connection established, no need to try other addresses. */
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break;
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}
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if (rp->ai_next != NULL)
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{
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/*
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* There's another address we can try, so log that this
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* one didn't work out. If the last one fails, too,
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* it will get logged outside the loop body so we don't
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* have to mention it here.
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*/
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log_error(LOG_LEVEL_CONNECT, "Could not connect to [%s]:%s: %s.",
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csp->http->host_ip_addr_str, service, strerror(socket_error));
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}
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}
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else
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{
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socket_error = errno;
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log_error(LOG_LEVEL_ERROR, "Could not get the state of "
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"the connection to [%s]:%s: %s; dropping connection.",
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csp->http->host_ip_addr_str, service, strerror(errno));
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}
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}
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/* Connection failed, try next address */
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close_socket(fd);
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}
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freeaddrinfo(result);
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if (!rp)
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{
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log_error(LOG_LEVEL_CONNECT, "Could not connect to [%s]:%s: %s.",
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host, service, strerror(socket_error));
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csp->error_message = strdup(strerror(socket_error));
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return(JB_INVALID_SOCKET);
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}
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log_error(LOG_LEVEL_CONNECT, "Connected to %s[%s]:%s.",
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host, csp->http->host_ip_addr_str, service);
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return(fd);
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}
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#else /* ndef HAVE_RFC2553 */
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/* Pre-getaddrinfo implementation */
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static jb_socket no_rfc2553_connect_to(const char *host, int portnum, struct client_state *csp)
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{
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struct sockaddr_in inaddr;
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jb_socket fd;
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unsigned int addr;
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fd_set wfds;
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struct timeval tv[1];
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#if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
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int flags;
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#endif
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#ifdef FEATURE_ACL
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struct access_control_addr dst[1];
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#endif /* def FEATURE_ACL */
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/* Don't leak memory when retrying. */
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freez(csp->http->host_ip_addr_str);
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memset((char *)&inaddr, 0, sizeof inaddr);
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if ((addr = resolve_hostname_to_ip(host)) == INADDR_NONE)
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{
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csp->http->host_ip_addr_str = strdup("unknown");
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return(JB_INVALID_SOCKET);
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}
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#ifdef FEATURE_ACL
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dst->addr = ntohl(addr);
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dst->port = portnum;
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if (block_acl(dst, csp))
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{
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#ifdef __OS2__
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errno = SOCEPERM;
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#else
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errno = EPERM;
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#endif
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return(JB_INVALID_SOCKET);
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}
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#endif /* def FEATURE_ACL */
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inaddr.sin_addr.s_addr = addr;
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inaddr.sin_family = AF_INET;
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csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
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#ifndef _WIN32
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if (sizeof(inaddr.sin_port) == sizeof(short))
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#endif /* ndef _WIN32 */
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{
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inaddr.sin_port = htons((unsigned short) portnum);
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}
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#ifndef _WIN32
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else
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{
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inaddr.sin_port = htonl((unsigned long)portnum);
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}
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#endif /* ndef _WIN32 */
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fd = socket(inaddr.sin_family, SOCK_STREAM, 0);
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#ifdef _WIN32
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if (fd == JB_INVALID_SOCKET)
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#else
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if (fd < 0)
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#endif
|
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{
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return(JB_INVALID_SOCKET);
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}
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|
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#ifdef TCP_NODELAY
|
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{ /* turn off TCP coalescence */
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|
int mi = 1;
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|
setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
|
|
}
|
|
#endif /* def TCP_NODELAY */
|
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|
|
#if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
|
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if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
|
|
{
|
|
flags |= O_NDELAY;
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fcntl(fd, F_SETFL, flags);
|
|
}
|
|
#endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
|
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|
|
while (connect(fd, (struct sockaddr *) & inaddr, sizeof inaddr) == JB_INVALID_SOCKET)
|
|
{
|
|
#ifdef _WIN32
|
|
if (errno == WSAEINPROGRESS)
|
|
#elif __OS2__
|
|
if (sock_errno() == EINPROGRESS)
|
|
#else /* ifndef _WIN32 */
|
|
if (errno == EINPROGRESS)
|
|
#endif /* ndef _WIN32 || __OS2__ */
|
|
{
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|
break;
|
|
}
|
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|
|
#ifdef __OS2__
|
|
if (sock_errno() != EINTR)
|
|
#else
|
|
if (errno != EINTR)
|
|
#endif /* __OS2__ */
|
|
{
|
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close_socket(fd);
|
|
return(JB_INVALID_SOCKET);
|
|
}
|
|
}
|
|
|
|
#if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
|
|
if (flags != -1)
|
|
{
|
|
flags &= ~O_NDELAY;
|
|
fcntl(fd, F_SETFL, flags);
|
|
}
|
|
#endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
|
|
|
|
/* wait for connection to complete */
|
|
FD_ZERO(&wfds);
|
|
FD_SET(fd, &wfds);
|
|
|
|
tv->tv_sec = 30;
|
|
tv->tv_usec = 0;
|
|
|
|
/* MS Windows uses int, not SOCKET, for the 1st arg of select(). Weird! */
|
|
if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
|
|
{
|
|
close_socket(fd);
|
|
return(JB_INVALID_SOCKET);
|
|
}
|
|
return(fd);
|
|
|
|
}
|
|
#endif /* ndef HAVE_RFC2553 */
|
|
|
|
|
|
/*********************************************************************
|
|
*
|
|
* Function : write_socket
|
|
*
|
|
* Description : Write the contents of buf (for n bytes) to socket fd.
|
|
*
|
|
* Parameters :
|
|
* 1 : fd = file descriptor (aka. handle) of socket to write to.
|
|
* 2 : buf = pointer to data to be written.
|
|
* 3 : len = length of data to be written to the socket "fd".
|
|
*
|
|
* Returns : 0 on success (entire buffer sent).
|
|
* nonzero on error.
|
|
*
|
|
*********************************************************************/
|
|
#ifdef AMIGA
|
|
int write_socket(jb_socket fd, const char *buf, ssize_t len)
|
|
#else
|
|
int write_socket(jb_socket fd, const char *buf, size_t len)
|
|
#endif
|
|
{
|
|
if (len == 0)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
log_error(LOG_LEVEL_WRITING, "to socket %d: %N", fd, len, buf);
|
|
|
|
#if defined(_WIN32)
|
|
return (send(fd, buf, (int)len, 0) != (int)len);
|
|
#elif defined(__BEOS__) || defined(AMIGA)
|
|
return (send(fd, buf, len, 0) != len);
|
|
#elif defined(__OS2__)
|
|
/*
|
|
* Break the data up into SOCKET_SEND_MAX chunks for sending...
|
|
* OS/2 seemed to complain when the chunks were too large.
|
|
*/
|
|
#define SOCKET_SEND_MAX 65000
|
|
{
|
|
int send_len, send_rc = 0, i = 0;
|
|
while ((i < len) && (send_rc != -1))
|
|
{
|
|
if ((i + SOCKET_SEND_MAX) > len)
|
|
send_len = len - i;
|
|
else
|
|
send_len = SOCKET_SEND_MAX;
|
|
send_rc = send(fd,(char*)buf + i, send_len, 0);
|
|
if (send_rc == -1)
|
|
return 1;
|
|
i = i + send_len;
|
|
}
|
|
return 0;
|
|
}
|
|
#else
|
|
return (write(fd, buf, len) != len);
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
/*********************************************************************
|
|
*
|
|
* Function : read_socket
|
|
*
|
|
* Description : Read from a TCP/IP socket in a platform independent way.
|
|
*
|
|
* Parameters :
|
|
* 1 : fd = file descriptor of the socket to read
|
|
* 2 : buf = pointer to buffer where data will be written
|
|
* Must be >= len bytes long.
|
|
* 3 : len = maximum number of bytes to read
|
|
*
|
|
* Returns : On success, the number of bytes read is returned (zero
|
|
* indicates end of file), and the file position is advanced
|
|
* by this number. It is not an error if this number is
|
|
* smaller than the number of bytes requested; this may hap-
|
|
* pen for example because fewer bytes are actually available
|
|
* right now (maybe because we were close to end-of-file, or
|
|
* because we are reading from a pipe, or from a terminal,
|
|
* or because read() was interrupted by a signal). On error,
|
|
* -1 is returned, and errno is set appropriately. In this
|
|
* case it is left unspecified whether the file position (if
|
|
* any) changes.
|
|
*
|
|
*********************************************************************/
|
|
int read_socket(jb_socket fd, char *buf, int len)
|
|
{
|
|
int ret;
|
|
|
|
if (len <= 0)
|
|
{
|
|
return(0);
|
|
}
|
|
|
|
#if defined(_WIN32)
|
|
ret = recv(fd, buf, len, 0);
|
|
#elif defined(__BEOS__) || defined(AMIGA) || defined(__OS2__)
|
|
ret = recv(fd, buf, (size_t)len, 0);
|
|
#else
|
|
ret = (int)read(fd, buf, (size_t)len);
|
|
#endif
|
|
|
|
if (ret > 0)
|
|
{
|
|
log_error(LOG_LEVEL_RECEIVED, "from socket %d: %N", fd, ret, buf);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
/*********************************************************************
|
|
*
|
|
* Function : data_is_available
|
|
*
|
|
* Description : Waits for data to arrive on a socket.
|
|
*
|
|
* Parameters :
|
|
* 1 : fd = file descriptor of the socket to read
|
|
* 2 : seconds_to_wait = number of seconds after which we give up.
|
|
*
|
|
* Returns : TRUE if data arrived in time,
|
|
* FALSE otherwise.
|
|
*
|
|
*********************************************************************/
|
|
int data_is_available(jb_socket fd, int seconds_to_wait)
|
|
{
|
|
char buf[10];
|
|
fd_set rfds;
|
|
struct timeval timeout;
|
|
int n;
|
|
|
|
memset(&timeout, 0, sizeof(timeout));
|
|
timeout.tv_sec = seconds_to_wait;
|
|
|
|
#ifdef __OS2__
|
|
/* Copy and pasted from jcc.c ... */
|
|
memset(&rfds, 0, sizeof(fd_set));
|
|
#else
|
|
FD_ZERO(&rfds);
|
|
#endif
|
|
FD_SET(fd, &rfds);
|
|
|
|
n = select(fd+1, &rfds, NULL, NULL, &timeout);
|
|
|
|
/*
|
|
* XXX: Do we care about the different error conditions?
|
|
*/
|
|
return ((n == 1) && (1 == recv(fd, buf, 1, MSG_PEEK)));
|
|
}
|
|
|
|
|
|
/*********************************************************************
|
|
*
|
|
* Function : close_socket
|
|
*
|
|
* Description : Closes a TCP/IP socket
|
|
*
|
|
* Parameters :
|
|
* 1 : fd = file descriptor of socket to be closed
|
|
*
|
|
* Returns : void
|
|
*
|
|
*********************************************************************/
|
|
void close_socket(jb_socket fd)
|
|
{
|
|
#if defined(_WIN32) || defined(__BEOS__)
|
|
closesocket(fd);
|
|
#elif defined(AMIGA)
|
|
CloseSocket(fd);
|
|
#elif defined(__OS2__)
|
|
soclose(fd);
|
|
#else
|
|
close(fd);
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
/*********************************************************************
|
|
*
|
|
* Function : bind_port
|
|
*
|
|
* Description : Call socket, set socket options, and listen.
|
|
* Called by listen_loop to "boot up" our proxy address.
|
|
*
|
|
* Parameters :
|
|
* 1 : hostnam = TCP/IP address to bind/listen to
|
|
* 2 : portnum = port to listen on
|
|
* 3 : pfd = pointer used to return file descriptor.
|
|
*
|
|
* Returns : if success, returns 0 and sets *pfd.
|
|
* if failure, returns -3 if address is in use,
|
|
* -2 if address unresolvable,
|
|
* -1 otherwise
|
|
*********************************************************************/
|
|
int bind_port(const char *hostnam, int portnum, jb_socket *pfd)
|
|
{
|
|
#ifdef HAVE_RFC2553
|
|
struct addrinfo hints;
|
|
struct addrinfo *result, *rp;
|
|
/*
|
|
* XXX: portnum should be a string to allow symbolic service
|
|
* names in the configuration file and to avoid the following
|
|
* int2string.
|
|
*/
|
|
char servnam[6];
|
|
int retval;
|
|
#else
|
|
struct sockaddr_in inaddr;
|
|
#endif /* def HAVE_RFC2553 */
|
|
jb_socket fd;
|
|
#ifndef _WIN32
|
|
int one = 1;
|
|
#endif /* ndef _WIN32 */
|
|
|
|
*pfd = JB_INVALID_SOCKET;
|
|
|
|
#ifdef HAVE_RFC2553
|
|
retval = snprintf(servnam, sizeof(servnam), "%d", portnum);
|
|
if ((-1 == retval) || (sizeof(servnam) <= retval))
|
|
{
|
|
log_error(LOG_LEVEL_ERROR,
|
|
"Port number (%d) ASCII decimal representation doesn't fit into 6 bytes",
|
|
portnum);
|
|
return -1;
|
|
}
|
|
|
|
memset(&hints, 0, sizeof(struct addrinfo));
|
|
if (hostnam == NULL)
|
|
{
|
|
/*
|
|
* XXX: This is a hack. The right thing to do
|
|
* would be to bind to both AF_INET and AF_INET6.
|
|
* This will also fail if there is no AF_INET
|
|
* version available.
|
|
*/
|
|
hints.ai_family = AF_INET;
|
|
}
|
|
else
|
|
{
|
|
hints.ai_family = AF_UNSPEC;
|
|
}
|
|
hints.ai_socktype = SOCK_STREAM;
|
|
hints.ai_flags = AI_PASSIVE;
|
|
hints.ai_protocol = 0; /* Really any stream protocol or TCP only */
|
|
hints.ai_canonname = NULL;
|
|
hints.ai_addr = NULL;
|
|
hints.ai_next = NULL;
|
|
|
|
if ((retval = getaddrinfo(hostnam, servnam, &hints, &result)))
|
|
{
|
|
log_error(LOG_LEVEL_ERROR,
|
|
"Can not resolve %s: %s", hostnam, gai_strerror(retval));
|
|
return -2;
|
|
}
|
|
#else
|
|
memset((char *)&inaddr, '\0', sizeof inaddr);
|
|
|
|
inaddr.sin_family = AF_INET;
|
|
inaddr.sin_addr.s_addr = resolve_hostname_to_ip(hostnam);
|
|
|
|
if (inaddr.sin_addr.s_addr == INADDR_NONE)
|
|
{
|
|
return(-2);
|
|
}
|
|
|
|
#ifndef _WIN32
|
|
if (sizeof(inaddr.sin_port) == sizeof(short))
|
|
#endif /* ndef _WIN32 */
|
|
{
|
|
inaddr.sin_port = htons((unsigned short) portnum);
|
|
}
|
|
#ifndef _WIN32
|
|
else
|
|
{
|
|
inaddr.sin_port = htonl((unsigned long) portnum);
|
|
}
|
|
#endif /* ndef _WIN32 */
|
|
#endif /* def HAVE_RFC2553 */
|
|
|
|
#ifdef HAVE_RFC2553
|
|
for (rp = result; rp != NULL; rp = rp->ai_next)
|
|
{
|
|
fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
|
|
#else
|
|
fd = socket(AF_INET, SOCK_STREAM, 0);
|
|
#endif /* def HAVE_RFC2553 */
|
|
|
|
#ifdef _WIN32
|
|
if (fd == JB_INVALID_SOCKET)
|
|
#else
|
|
if (fd < 0)
|
|
#endif
|
|
{
|
|
#ifdef HAVE_RFC2553
|
|
continue;
|
|
#else
|
|
return(-1);
|
|
#endif
|
|
}
|
|
|
|
#ifndef _WIN32
|
|
/*
|
|
* This is not needed for Win32 - in fact, it stops
|
|
* duplicate instances of Privoxy from being caught.
|
|
*
|
|
* On UNIX, we assume the user is sensible enough not
|
|
* to start Privoxy multiple times on the same IP.
|
|
* Without this, stopping and restarting Privoxy
|
|
* from a script fails.
|
|
* Note: SO_REUSEADDR is meant to only take over
|
|
* sockets which are *not* in listen state in Linux,
|
|
* e.g. sockets in TIME_WAIT. YMMV.
|
|
*/
|
|
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
|
|
#endif /* ndef _WIN32 */
|
|
|
|
#ifdef HAVE_RFC2553
|
|
if (bind(fd, rp->ai_addr, rp->ai_addrlen) < 0)
|
|
#else
|
|
if (bind(fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
|
|
#endif
|
|
{
|
|
#ifdef _WIN32
|
|
errno = WSAGetLastError();
|
|
if (errno == WSAEADDRINUSE)
|
|
#else
|
|
if (errno == EADDRINUSE)
|
|
#endif
|
|
{
|
|
#ifdef HAVE_RFC2553
|
|
freeaddrinfo(result);
|
|
#endif
|
|
close_socket(fd);
|
|
return(-3);
|
|
}
|
|
else
|
|
{
|
|
close_socket(fd);
|
|
#ifndef HAVE_RFC2553
|
|
return(-1);
|
|
}
|
|
}
|
|
#else
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* bind() succeeded, escape from for-loop */
|
|
/*
|
|
* XXX: Support multiple listening sockets (e.g. localhost
|
|
* resolves to AF_INET and AF_INET6, but only the first address
|
|
* is used
|
|
*/
|
|
break;
|
|
}
|
|
}
|
|
|
|
freeaddrinfo(result);
|
|
if (rp == NULL)
|
|
{
|
|
/* All bind()s failed */
|
|
return(-1);
|
|
}
|
|
#endif /* ndef HAVE_RFC2553 */
|
|
|
|
while (listen(fd, MAX_LISTEN_BACKLOG) == -1)
|
|
{
|
|
if (errno != EINTR)
|
|
{
|
|
return(-1);
|
|
}
|
|
}
|
|
|
|
*pfd = fd;
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
/*********************************************************************
|
|
*
|
|
* Function : get_host_information
|
|
*
|
|
* Description : Determines the IP address the client used to
|
|
* reach us and the hostname associated with it.
|
|
*
|
|
* XXX: Most of the code has been copy and pasted
|
|
* from accept_connection() and not all of the
|
|
* ifdefs paths have been tested afterwards.
|
|
*
|
|
* Parameters :
|
|
* 1 : afd = File descriptor returned from accept().
|
|
* 2 : ip_address = Pointer to return the pointer to
|
|
* the ip address string.
|
|
* 3 : port = Pointer to return the pointer to
|
|
* the TCP port string.
|
|
* 4 : hostname = Pointer to return the pointer to
|
|
* the hostname or NULL if the caller
|
|
* isn't interested in it.
|
|
*
|
|
* Returns : void.
|
|
*
|
|
*********************************************************************/
|
|
void get_host_information(jb_socket afd, char **ip_address, char **port,
|
|
char **hostname)
|
|
{
|
|
#ifdef HAVE_RFC2553
|
|
struct sockaddr_storage server;
|
|
int retval;
|
|
#else
|
|
struct sockaddr_in server;
|
|
struct hostent *host = NULL;
|
|
#endif /* HAVE_RFC2553 */
|
|
#if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
|
|
/* according to accept_connection() this fixes a warning. */
|
|
int s_length, s_length_provided;
|
|
#else
|
|
socklen_t s_length, s_length_provided;
|
|
#endif
|
|
#ifndef HAVE_RFC2553
|
|
#if defined(HAVE_GETHOSTBYADDR_R_8_ARGS) || defined(HAVE_GETHOSTBYADDR_R_7_ARGS) || defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
|
|
struct hostent result;
|
|
#if defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
|
|
struct hostent_data hdata;
|
|
#else
|
|
char hbuf[HOSTENT_BUFFER_SIZE];
|
|
int thd_err;
|
|
#endif /* def HAVE_GETHOSTBYADDR_R_5_ARGS */
|
|
#endif /* def HAVE_GETHOSTBYADDR_R_(8|7|5)_ARGS */
|
|
#endif /* ifndef HAVE_RFC2553 */
|
|
s_length = s_length_provided = sizeof(server);
|
|
|
|
if (NULL != hostname)
|
|
{
|
|
*hostname = NULL;
|
|
}
|
|
*ip_address = NULL;
|
|
*port = NULL;
|
|
|
|
if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
|
|
{
|
|
if (s_length > s_length_provided)
|
|
{
|
|
log_error(LOG_LEVEL_ERROR, "getsockname() truncated server address");
|
|
return;
|
|
}
|
|
*port = malloc(NI_MAXSERV);
|
|
if (NULL == *port)
|
|
{
|
|
log_error(LOG_LEVEL_ERROR,
|
|
"Out of memory while getting the client's port.");
|
|
return;
|
|
}
|
|
#ifdef HAVE_RFC2553
|
|
*ip_address = malloc(NI_MAXHOST);
|
|
if (NULL == *ip_address)
|
|
{
|
|
log_error(LOG_LEVEL_ERROR,
|
|
"Out of memory while getting the client's IP address.");
|
|
freez(*port);
|
|
return;
|
|
}
|
|
retval = getnameinfo((struct sockaddr *) &server, s_length,
|
|
*ip_address, NI_MAXHOST, *port, NI_MAXSERV,
|
|
NI_NUMERICHOST|NI_NUMERICSERV);
|
|
if (retval)
|
|
{
|
|
log_error(LOG_LEVEL_ERROR,
|
|
"Unable to print my own IP address: %s", gai_strerror(retval));
|
|
freez(*ip_address);
|
|
freez(*port);
|
|
return;
|
|
}
|
|
#else
|
|
*ip_address = strdup(inet_ntoa(server.sin_addr));
|
|
snprintf(*port, NI_MAXSERV, "%hu", ntohs(server.sin_port));
|
|
#endif /* HAVE_RFC2553 */
|
|
if (NULL == hostname)
|
|
{
|
|
/*
|
|
* We're done here, the caller isn't
|
|
* interested in knowing the hostname.
|
|
*/
|
|
return;
|
|
}
|
|
|
|
#ifdef HAVE_RFC2553
|
|
*hostname = malloc(NI_MAXHOST);
|
|
if (NULL == *hostname)
|
|
{
|
|
log_error(LOG_LEVEL_ERROR,
|
|
"Out of memory while getting the client's hostname.");
|
|
return;
|
|
}
|
|
retval = getnameinfo((struct sockaddr *) &server, s_length,
|
|
*hostname, NI_MAXHOST, NULL, 0, NI_NAMEREQD);
|
|
if (retval)
|
|
{
|
|
log_error(LOG_LEVEL_ERROR,
|
|
"Unable to resolve my own IP address: %s", gai_strerror(retval));
|
|
freez(*hostname);
|
|
}
|
|
#else
|
|
#if defined(HAVE_GETHOSTBYADDR_R_8_ARGS)
|
|
gethostbyaddr_r((const char *)&server.sin_addr,
|
|
sizeof(server.sin_addr), AF_INET,
|
|
&result, hbuf, HOSTENT_BUFFER_SIZE,
|
|
&host, &thd_err);
|
|
#elif defined(HAVE_GETHOSTBYADDR_R_7_ARGS)
|
|
host = gethostbyaddr_r((const char *)&server.sin_addr,
|
|
sizeof(server.sin_addr), AF_INET,
|
|
&result, hbuf, HOSTENT_BUFFER_SIZE, &thd_err);
|
|
#elif defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
|
|
if (0 == gethostbyaddr_r((const char *)&server.sin_addr,
|
|
sizeof(server.sin_addr), AF_INET,
|
|
&result, &hdata))
|
|
{
|
|
host = &result;
|
|
}
|
|
else
|
|
{
|
|
host = NULL;
|
|
}
|
|
#elif defined(MUTEX_LOCKS_AVAILABLE)
|
|
privoxy_mutex_lock(&resolver_mutex);
|
|
host = gethostbyaddr((const char *)&server.sin_addr,
|
|
sizeof(server.sin_addr), AF_INET);
|
|
privoxy_mutex_unlock(&resolver_mutex);
|
|
#else
|
|
host = gethostbyaddr((const char *)&server.sin_addr,
|
|
sizeof(server.sin_addr), AF_INET);
|
|
#endif
|
|
if (host == NULL)
|
|
{
|
|
log_error(LOG_LEVEL_ERROR, "Unable to get my own hostname: %E\n");
|
|
}
|
|
else
|
|
{
|
|
*hostname = strdup(host->h_name);
|
|
}
|
|
#endif /* else def HAVE_RFC2553 */
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
/*********************************************************************
|
|
*
|
|
* Function : accept_connection
|
|
*
|
|
* Description : Accepts a connection on one of possibly multiple
|
|
* sockets. The socket(s) to check must have been
|
|
* created using bind_port().
|
|
*
|
|
* Parameters :
|
|
* 1 : csp = Client state, cfd, ip_addr_str, and
|
|
* ip_addr_long will be set by this routine.
|
|
* 2 : fds = File descriptors returned from bind_port
|
|
*
|
|
* Returns : when a connection is accepted, it returns 1 (TRUE).
|
|
* On an error it returns 0 (FALSE).
|
|
*
|
|
*********************************************************************/
|
|
int accept_connection(struct client_state * csp, jb_socket fds[])
|
|
{
|
|
#ifdef HAVE_RFC2553
|
|
/* XXX: client is stored directly into csp->tcp_addr */
|
|
#define client (csp->tcp_addr)
|
|
#else
|
|
struct sockaddr_in client;
|
|
#endif
|
|
jb_socket afd;
|
|
#if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
|
|
/* Wierdness - fix a warning. */
|
|
int c_length;
|
|
#else
|
|
socklen_t c_length;
|
|
#endif
|
|
int retval;
|
|
int i;
|
|
int max_selected_socket;
|
|
fd_set selected_fds;
|
|
jb_socket fd;
|
|
|
|
c_length = sizeof(client);
|
|
|
|
/*
|
|
* Wait for a connection on any socket.
|
|
* Return immediately if no socket is listening.
|
|
* XXX: Why not treat this as fatal error?
|
|
*/
|
|
FD_ZERO(&selected_fds);
|
|
max_selected_socket = 0;
|
|
for (i = 0; i < MAX_LISTENING_SOCKETS; i++)
|
|
{
|
|
if (JB_INVALID_SOCKET != fds[i])
|
|
{
|
|
FD_SET(fds[i], &selected_fds);
|
|
if (max_selected_socket < fds[i] + 1)
|
|
{
|
|
max_selected_socket = fds[i] + 1;
|
|
}
|
|
}
|
|
}
|
|
if (0 == max_selected_socket)
|
|
{
|
|
return 0;
|
|
}
|
|
do
|
|
{
|
|
retval = select(max_selected_socket, &selected_fds, NULL, NULL, NULL);
|
|
} while (retval < 0 && errno == EINTR);
|
|
if (retval <= 0)
|
|
{
|
|
if (0 == retval)
|
|
{
|
|
log_error(LOG_LEVEL_ERROR,
|
|
"Waiting on new client failed because select(2) returned 0."
|
|
" This should not happen.");
|
|
}
|
|
else
|
|
{
|
|
log_error(LOG_LEVEL_ERROR,
|
|
"Waiting on new client failed because of problems in select(2): "
|
|
"%s.", strerror(errno));
|
|
}
|
|
return 0;
|
|
}
|
|
for (i = 0; i < MAX_LISTENING_SOCKETS && !FD_ISSET(fds[i], &selected_fds);
|
|
i++);
|
|
if (i >= MAX_LISTENING_SOCKETS)
|
|
{
|
|
log_error(LOG_LEVEL_ERROR,
|
|
"select(2) reported connected clients (number = %u, "
|
|
"descriptor boundary = %u), but none found.",
|
|
retval, max_selected_socket);
|
|
return 0;
|
|
}
|
|
fd = fds[i];
|
|
|
|
/* Accept selected connection */
|
|
#ifdef _WIN32
|
|
afd = accept (fd, (struct sockaddr *) &client, &c_length);
|
|
if (afd == JB_INVALID_SOCKET)
|
|
{
|
|
return 0;
|
|
}
|
|
#else
|
|
do
|
|
{
|
|
#if defined(FEATURE_ACCEPT_FILTER) && defined(SO_ACCEPTFILTER)
|
|
struct accept_filter_arg af_options;
|
|
bzero(&af_options, sizeof(af_options));
|
|
strlcpy(af_options.af_name, "httpready", sizeof(af_options.af_name));
|
|
setsockopt(fd, SOL_SOCKET, SO_ACCEPTFILTER, &af_options, sizeof(af_options));
|
|
#endif
|
|
afd = accept (fd, (struct sockaddr *) &client, &c_length);
|
|
} while (afd < 1 && errno == EINTR);
|
|
if (afd < 0)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
csp->cfd = afd;
|
|
#ifdef HAVE_RFC2553
|
|
csp->ip_addr_str = malloc(NI_MAXHOST);
|
|
if (NULL == csp->ip_addr_str)
|
|
{
|
|
log_error(LOG_LEVEL_ERROR,
|
|
"Out of memory while getting the client's IP address.");
|
|
return 0;
|
|
}
|
|
retval = getnameinfo((struct sockaddr *) &client, c_length,
|
|
csp->ip_addr_str, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
|
|
if (!csp->ip_addr_str || retval)
|
|
{
|
|
log_error(LOG_LEVEL_ERROR, "Can not save csp->ip_addr_str: %s",
|
|
(csp->ip_addr_str) ? gai_strerror(retval) : "Insuffcient memory");
|
|
freez(csp->ip_addr_str);
|
|
}
|
|
#undef client
|
|
#else
|
|
csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
|
|
csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
|
|
#endif /* def HAVE_RFC2553 */
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
/*********************************************************************
|
|
*
|
|
* Function : resolve_hostname_to_ip
|
|
*
|
|
* Description : Resolve a hostname to an internet tcp/ip address.
|
|
* NULL or an empty string resolve to INADDR_ANY.
|
|
*
|
|
* Parameters :
|
|
* 1 : host = hostname to resolve
|
|
*
|
|
* Returns : INADDR_NONE => failure, INADDR_ANY or tcp/ip address if successful.
|
|
*
|
|
*********************************************************************/
|
|
unsigned long resolve_hostname_to_ip(const char *host)
|
|
{
|
|
struct sockaddr_in inaddr;
|
|
struct hostent *hostp;
|
|
#if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS) || defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
|
|
struct hostent result;
|
|
#if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
|
|
char hbuf[HOSTENT_BUFFER_SIZE];
|
|
int thd_err;
|
|
#else /* defined(HAVE_GETHOSTBYNAME_R_3_ARGS) */
|
|
struct hostent_data hdata;
|
|
#endif /* def HAVE_GETHOSTBYNAME_R_(6|5)_ARGS */
|
|
#endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
|
|
|
|
if ((host == NULL) || (*host == '\0'))
|
|
{
|
|
return(INADDR_ANY);
|
|
}
|
|
|
|
memset((char *) &inaddr, 0, sizeof inaddr);
|
|
|
|
if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
|
|
{
|
|
unsigned int dns_retries = 0;
|
|
#if defined(HAVE_GETHOSTBYNAME_R_6_ARGS)
|
|
while (gethostbyname_r(host, &result, hbuf,
|
|
HOSTENT_BUFFER_SIZE, &hostp, &thd_err)
|
|
&& (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
|
|
{
|
|
log_error(LOG_LEVEL_ERROR,
|
|
"Timeout #%u while trying to resolve %s. Trying again.",
|
|
dns_retries, host);
|
|
}
|
|
#elif defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
|
|
while (NULL == (hostp = gethostbyname_r(host, &result,
|
|
hbuf, HOSTENT_BUFFER_SIZE, &thd_err))
|
|
&& (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
|
|
{
|
|
log_error(LOG_LEVEL_ERROR,
|
|
"Timeout #%u while trying to resolve %s. Trying again.",
|
|
dns_retries, host);
|
|
}
|
|
#elif defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
|
|
/*
|
|
* XXX: Doesn't retry in case of soft errors.
|
|
* Does this gethostbyname_r version set h_errno?
|
|
*/
|
|
if (0 == gethostbyname_r(host, &result, &hdata))
|
|
{
|
|
hostp = &result;
|
|
}
|
|
else
|
|
{
|
|
hostp = NULL;
|
|
}
|
|
#elif defined(MUTEX_LOCKS_AVAILABLE)
|
|
privoxy_mutex_lock(&resolver_mutex);
|
|
while (NULL == (hostp = gethostbyname(host))
|
|
&& (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
|
|
{
|
|
log_error(LOG_LEVEL_ERROR,
|
|
"Timeout #%u while trying to resolve %s. Trying again.",
|
|
dns_retries, host);
|
|
}
|
|
privoxy_mutex_unlock(&resolver_mutex);
|
|
#else
|
|
while (NULL == (hostp = gethostbyname(host))
|
|
&& (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
|
|
{
|
|
log_error(LOG_LEVEL_ERROR,
|
|
"Timeout #%u while trying to resolve %s. Trying again.",
|
|
dns_retries, host);
|
|
}
|
|
#endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
|
|
/*
|
|
* On Mac OSX, if a domain exists but doesn't have a type A
|
|
* record associated with it, the h_addr member of the struct
|
|
* hostent returned by gethostbyname is NULL, even if h_length
|
|
* is 4. Therefore the second test below.
|
|
*/
|
|
if (hostp == NULL || hostp->h_addr == NULL)
|
|
{
|
|
errno = EINVAL;
|
|
log_error(LOG_LEVEL_ERROR, "could not resolve hostname %s", host);
|
|
return(INADDR_NONE);
|
|
}
|
|
if (hostp->h_addrtype != AF_INET)
|
|
{
|
|
#ifdef _WIN32
|
|
errno = WSAEPROTOTYPE;
|
|
#else
|
|
errno = EPROTOTYPE;
|
|
#endif
|
|
log_error(LOG_LEVEL_ERROR, "hostname %s resolves to unknown address type.", host);
|
|
return(INADDR_NONE);
|
|
}
|
|
memcpy(
|
|
(char *) &inaddr.sin_addr,
|
|
(char *) hostp->h_addr,
|
|
sizeof(inaddr.sin_addr)
|
|
);
|
|
}
|
|
return(inaddr.sin_addr.s_addr);
|
|
|
|
}
|
|
|
|
|
|
#ifdef FEATURE_CONNECTION_KEEP_ALIVE
|
|
/*********************************************************************
|
|
*
|
|
* Function : socket_is_still_alive
|
|
*
|
|
* Description : Figures out whether or not a socket is still alive.
|
|
*
|
|
* Parameters :
|
|
* 1 : sfd = The socket to check.
|
|
*
|
|
* Returns : TRUE for yes, otherwise FALSE.
|
|
*
|
|
*********************************************************************/
|
|
int socket_is_still_alive(jb_socket sfd)
|
|
{
|
|
char buf[10];
|
|
int no_data_waiting;
|
|
|
|
#ifdef HAVE_POLL
|
|
int poll_result;
|
|
struct pollfd poll_fd[1];
|
|
|
|
memset(poll_fd, 0, sizeof(poll_fd));
|
|
poll_fd[0].fd = sfd;
|
|
poll_fd[0].events = POLLIN;
|
|
|
|
poll_result = poll(poll_fd, 1, 0);
|
|
|
|
if (-1 == poll_result)
|
|
{
|
|
log_error(LOG_LEVEL_CONNECT, "Polling socket %d failed.", sfd);
|
|
return FALSE;
|
|
}
|
|
no_data_waiting = !(poll_fd[0].revents & POLLIN);
|
|
#else
|
|
fd_set readable_fds;
|
|
struct timeval timeout;
|
|
int ret;
|
|
|
|
memset(&timeout, '\0', sizeof(timeout));
|
|
FD_ZERO(&readable_fds);
|
|
FD_SET(sfd, &readable_fds);
|
|
|
|
ret = select((int)sfd+1, &readable_fds, NULL, NULL, &timeout);
|
|
if (ret < 0)
|
|
{
|
|
log_error(LOG_LEVEL_CONNECT, "select() on socket %d failed: %E", sfd);
|
|
return FALSE;
|
|
}
|
|
no_data_waiting = !FD_ISSET(sfd, &readable_fds);
|
|
#endif /* def HAVE_POLL */
|
|
|
|
return (no_data_waiting || (1 == recv(sfd, buf, 1, MSG_PEEK)));
|
|
}
|
|
#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
|
|
|
|
|
|
/*
|
|
Local Variables:
|
|
tab-width: 3
|
|
end:
|
|
*/
|