-const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.53 2009/04/17 11:39:52 fabiankeil Exp $";
+const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.140 2017/05/25 11:16:56 fabiankeil Exp $";
/*********************************************************************
*
* File : $Source: /cvsroot/ijbswa/current/jbsockets.c,v $
* OS-independent. Contains #ifdefs to make this work
* on many platforms.
*
- * Copyright : Written by and Copyright (C) 2001-2007 the SourceForge
+ * Copyright : Written by and Copyright (C) 2001-2017 the
* Privoxy team. http://www.privoxy.org/
*
* Based on the Internet Junkbuster originally written
- * by and Copyright (C) 1997 Anonymous Coders and
+ * by and Copyright (C) 1997 Anonymous Coders and
* Junkbusters Corporation. http://www.junkbusters.com
*
- * This program is free software; you can redistribute it
+ * This program is free software; you can redistribute it
* and/or modify it under the terms of the GNU General
* Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at
* or write to the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
- * Revisions :
- * $Log: jbsockets.c,v $
- * Revision 1.53 2009/04/17 11:39:52 fabiankeil
- * If the hostname is 'localhost' or not specified, request an AF_INET address.
- *
- * Revision 1.52 2009/04/17 11:34:34 fabiankeil
- * Style cosmetics for the IPv6 code.
- *
- * Revision 1.51 2009/04/17 11:27:49 fabiankeil
- * Petr Pisar's privoxy-3.0.12-ipv6-3.diff.
- *
- * Revision 1.50 2008/12/20 14:53:55 fabiankeil
- * Add config option socket-timeout to control the time
- * Privoxy waits for data to arrive on a socket. Useful
- * in case of stale ssh tunnels or when fuzz-testing.
- *
- * Revision 1.49 2008/11/10 17:03:57 fabiankeil
- * Fix a gcc44 warning and remove a now-obsolete cast.
- *
- * Revision 1.48 2008/09/04 08:13:58 fabiankeil
- * Prepare for critical sections on Windows by adding a
- * layer of indirection before the pthread mutex functions.
- *
- * Revision 1.47 2008/03/26 18:07:07 fabiankeil
- * Add hostname directive. Closes PR#1918189.
- *
- * Revision 1.46 2008/03/21 11:13:57 fabiankeil
- * Only gather host information if it's actually needed.
- * Also move the code out of accept_connection() so it's less likely
- * to delay other incoming connections if the host is misconfigured.
- *
- * Revision 1.45 2007/09/30 16:59:22 fabiankeil
- * Set the maximum listen() backlog to 128. Apparently SOMAXCONN is
- * neither high enough, nor a hard limit on mingw32. Again for BR#1795281.
- *
- * Revision 1.44 2007/09/15 13:01:31 fabiankeil
- * Increase listen() backlog to SOMAXCONN (or 128) to decrease
- * chances of dropped connections under load. Problem reported
- * and fix suggested by nobody in BR#1795281.
- *
- * Revision 1.43 2007/06/01 18:16:36 fabiankeil
- * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
- * deadlocks and crashes on OpenBSD and possibly other OS with neither
- * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
- * Thanks to Ralf Horstmann for report and solution.
- *
- * Revision 1.42 2007/04/01 17:37:07 fabiankeil
- * - Add DNS retries for Solaris and other systems
- * whose gethostbyname_r version takes five arguments.
- * - Move maximum number of DNS retries into a macro.
- *
- * Revision 1.41 2006/11/13 19:05:51 fabiankeil
- * Make pthread mutex locking more generic. Instead of
- * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
- * and use mutex locking unless there is an _r function
- * available. Better safe than sorry.
- *
- * Fixes "./configure --disable-pthread" and should result
- * in less threading-related problems on pthread-using platforms,
- * but it still doesn't fix BR#1122404.
- *
- * Revision 1.40 2006/09/02 15:36:42 fabiankeil
- * Follow the OpenBSD port's lead and protect the resolve
- * functions on OpenBSD as well.
- *
- * Revision 1.39 2006/08/03 02:46:41 david__schmidt
- * Incorporate Fabian Keil's patch work:\rhttp://www.fabiankeil.de/sourcecode/privoxy/
- *
- * Revision 1.38 2006/07/18 14:48:46 david__schmidt
- * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
- * with what was really the latest development (the v_3_0_branch branch)
- *
- * Revision 1.35.2.8 2006/01/21 16:16:08 david__schmidt
- * Thanks to Edward Carrel for his patch to modernize OSX's\rpthreads support. See bug #1409623.
- *
- * Revision 1.35.2.7 2005/05/07 21:50:55 david__schmidt
- * A few memory leaks plugged (mostly on error paths)
- *
- * Revision 1.35.2.6 2003/12/17 16:34:40 oes
- * Cosmetics
- *
- * Revision 1.35.2.5 2003/04/29 11:32:54 oes
- * Don't rely on h_addr being non-NULL after gethostbyname.
- * Works around an oddness in Max OSX and closes bug #724796
- *
- * Revision 1.35.2.4 2003/04/04 12:40:20 oes
- * Made sure the errno set by bind, not close[socket] is used in
- * bind_port. Probably fixes bugs #713777, #705562.
- *
- * Revision 1.35.2.3 2003/03/07 03:41:04 david__schmidt
- * Wrapping all *_r functions (the non-_r versions of them) with mutex semaphores for OSX. Hopefully this will take care of all of those pesky crash reports.
- *
- * Revision 1.35.2.2 2002/11/20 14:37:24 oes
- * Fixed Win32 error logging in bind_port.
- * Thanks to Oliver Stoeneberg for the hint.
- *
- * Revision 1.35.2.1 2002/05/26 23:41:27 joergs
- * AmigaOS: Fixed wrong type of len in write_socket()
- *
- * Revision 1.35 2002/04/26 15:50:04 joergs
- * AmigaOS: No socklen_t, added AMIGA to the systems using int instead.
- *
- * Revision 1.34 2002/04/08 20:31:41 swa
- * fixed JB spelling
- *
- * Revision 1.33 2002/04/03 16:02:18 gliptak
- * Correcting compile warning with older gcc
- *
- * Revision 1.32 2002/03/31 17:18:59 jongfoster
- * Win32 only: Enabling STRICT to fix a VC++ compile warning.
- *
- * Revision 1.31 2002/03/29 03:33:13 david__schmidt
- * Fix Mac OSX compiler warnings
- *
- * Revision 1.30 2002/03/27 14:32:43 david__schmidt
- * More compiler warning message maintenance
- *
- * Revision 1.29 2002/03/26 22:29:54 swa
- * we have a new homepage!
- *
- * Revision 1.28 2002/03/24 13:25:43 swa
- * name change related issues
- *
- * Revision 1.27 2002/03/13 00:27:05 jongfoster
- * Killing warnings
- *
- * Revision 1.26 2002/03/11 22:07:02 david__schmidt
- * OS/2 port maintenance:
- * - Fixed EMX build - it had decayed a little
- * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
- * substituted a memset for now.
- *
- * Revision 1.25 2002/03/09 20:03:52 jongfoster
- * - Making various functions return int rather than size_t.
- * (Undoing a recent change). Since size_t is unsigned on
- * Windows, functions like read_socket that return -1 on
- * error cannot return a size_t.
- *
- * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
- * crashes, and also frequently caused JB to jump to 100%
- * CPU and stay there. (Because it thought it had just
- * read ((unsigned)-1) == 4Gb of data...)
- *
- * - The signature of write_socket has changed, it now simply
- * returns success=0/failure=nonzero.
- *
- * - Trying to get rid of a few warnings --with-debug on
- * Windows, I've introduced a new type "jb_socket". This is
- * used for the socket file descriptors. On Windows, this
- * is SOCKET (a typedef for unsigned). Everywhere else, it's
- * an int. The error value can't be -1 any more, so it's
- * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
- * Windows it maps to the #define INVALID_SOCKET.)
- *
- * - The signature of bind_port has changed.
- *
- * Revision 1.24 2002/03/07 03:51:36 oes
- * - Improved handling of failed DNS lookups
- * - Fixed compiler warnings etc
- *
- * Revision 1.23 2002/03/05 00:36:01 jongfoster
- * Fixing bug 514988 - unable to restart Junkbuster
- *
- * Revision 1.22 2002/03/04 02:08:02 david__schmidt
- * Enable web editing of actions file on OS/2 (it had been broken all this time!)
- *
- * Revision 1.21 2002/01/09 14:32:33 oes
- * Added support for gethostbyname_r and gethostbyaddr_r.
- *
- * Revision 1.20 2001/11/16 00:48:48 jongfoster
- * Enabling duplicate-socket detection for all platforms, not
- * just Win32.
- *
- * Revision 1.19 2001/10/25 03:40:47 david__schmidt
- * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
- * threads to call select() simultaneously. So, it's time to do a real, live,
- * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
- * (native). Both versions will work, but using __OS2__ offers multi-threading.
- *
- * Revision 1.18 2001/09/21 23:02:02 david__schmidt
- * Cleaning up 2 compiler warnings on OS/2.
- *
- * Revision 1.17 2001/09/13 20:11:46 jongfoster
- * Fixing 2 compiler warnings under Win32
- *
- * Revision 1.16 2001/07/30 22:08:36 jongfoster
- * Tidying up #defines:
- * - All feature #defines are now of the form FEATURE_xxx
- * - Permanently turned off WIN_GUI_EDIT
- * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
- *
- * Revision 1.15 2001/07/29 17:40:43 jongfoster
- * Fixed compiler warning by adding a cast
- *
- * Revision 1.14 2001/07/18 13:47:59 oes
- * Eliminated dirty hack for getsockbyname()
- *
- * Revision 1.13 2001/07/15 13:56:57 jongfoster
- * Removing unused local variable.
- *
- * Revision 1.12 2001/07/01 17:04:11 oes
- * Bugfix: accept_connection no longer uses the obsolete hstrerror() function
- *
- * Revision 1.11 2001/06/29 21:45:41 oes
- * Indentation, CRLF->LF, Tab-> Space
- *
- * Revision 1.10 2001/06/29 13:29:15 oes
- * - Added remote (server) host IP to csp->http->host_ip_addr_str
- * - Added detection of local socket IP and fqdn
- * - Removed logentry from cancelled commit
- *
- * Revision 1.9 2001/06/07 23:06:09 jongfoster
- * The host parameter to connect_to() is now const.
- *
- * Revision 1.8 2001/06/03 19:12:07 oes
- * filled comment
- *
- * Revision 1.7 2001/05/28 16:14:00 jongfoster
- * Fixing bug in LOG_LEVEL_LOG
- *
- * Revision 1.6 2001/05/26 17:28:32 jongfoster
- * Fixed LOG_LEVEL_LOG
- *
- * Revision 1.5 2001/05/26 15:26:15 jongfoster
- * ACL feature now provides more security by immediately dropping
- * connections from untrusted hosts.
- *
- * Revision 1.4 2001/05/26 00:37:42 jongfoster
- * Cosmetic indentation correction.
- *
- * Revision 1.3 2001/05/25 21:57:54 jongfoster
- * Now gives a warning under Windows if you try to bind
- * it to a port that's already in use.
- *
- * Revision 1.2 2001/05/17 23:01:01 oes
- * - Cleaned CRLF's from the sources and related files
- *
- * Revision 1.1.1.1 2001/05/15 13:58:54 oes
- * Initial import of version 2.9.3 source tree
- *
- *
*********************************************************************/
-\f
+
#include "config.h"
#ifndef STRICT
#define STRICT
#endif
+#include <winsock2.h>
#include <windows.h>
#include <sys/timeb.h>
#include <io.h>
#endif
+#ifdef HAVE_POLL
+#ifdef __GLIBC__
+#include <sys/poll.h>
+#else
+#include <poll.h>
+#endif /* def __GLIBC__ */
+#endif /* HAVE_POLL */
+
#include "project.h"
-#ifdef FEATURE_PTHREAD
+/* For mutex semaphores only */
#include "jcc.h"
-/* jcc.h is for mutex semaphores only */
-#endif /* def FEATURE_PTHREAD */
#include "jbsockets.h"
#include "filters.h"
#include "errlog.h"
#include "miscutil.h"
+/* Mac OSX doesn't define AI_NUMERICSESRV */
+#ifndef AI_NUMERICSERV
+#define AI_NUMERICSERV 0
+#endif
+
const char jbsockets_h_rcs[] = JBSOCKETS_H_VERSION;
/*
#define MAX_LISTEN_BACKLOG 128
+#ifdef HAVE_RFC2553
+static jb_socket rfc2553_connect_to(const char *host, int portnum, struct client_state *csp);
+#else
+static jb_socket no_rfc2553_connect_to(const char *host, int portnum, struct client_state *csp);
+#endif
+
+/*********************************************************************
+ *
+ * Function : set_no_delay_flag
+ *
+ * Description : Disables TCP coalescence for the given socket.
+ *
+ * Parameters :
+ * 1 : fd = The file descriptor to operate on
+ *
+ * Returns : void
+ *
+ *********************************************************************/
+static void set_no_delay_flag(int fd)
+{
+#ifdef TCP_NODELAY
+ int mi = 1;
+
+ if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &mi, sizeof(int)))
+ {
+ log_error(LOG_LEVEL_ERROR,
+ "Failed to disable TCP coalescence for socket %d", fd);
+ }
+#else
+#warning set_no_delay_flag() is a nop due to lack of TCP_NODELAY
+#endif /* def TCP_NODELAY */
+}
/*********************************************************************
*
*
* Parameters :
* 1 : host = hostname to connect to
- * 2 : portnum = port to connent on (XXX: should be unsigned)
+ * 2 : portnum = port to connect to (XXX: should be unsigned)
* 3 : csp = Current client state (buffers, headers, etc...)
- * Not modified, only used for source IP and ACL.
*
* Returns : JB_INVALID_SOCKET => failure, else it is the socket
* file descriptor.
*
*********************************************************************/
+jb_socket connect_to(const char *host, int portnum, struct client_state *csp)
+{
+ jb_socket fd;
+ int forwarded_connect_retries = 0;
+
+ do
+ {
+ /*
+ * XXX: The whole errno overloading is ridiculous and should
+ * be replaced with something sane and thread safe
+ */
+ /* errno = 0;*/
+#ifdef HAVE_RFC2553
+ fd = rfc2553_connect_to(host, portnum, csp);
+#else
+ fd = no_rfc2553_connect_to(host, portnum, csp);
+#endif
+ if ((fd != JB_INVALID_SOCKET) || (errno == EINVAL)
+ || (csp->fwd == NULL)
+ || ((csp->fwd->forward_host == NULL) && (csp->fwd->type == SOCKS_NONE)))
+ {
+ break;
+ }
+ forwarded_connect_retries++;
+ if (csp->config->forwarded_connect_retries != 0)
+ {
+ log_error(LOG_LEVEL_ERROR,
+ "Attempt %d of %d to connect to %s failed. Trying again.",
+ forwarded_connect_retries, csp->config->forwarded_connect_retries + 1, host);
+ }
+
+ } while (forwarded_connect_retries < csp->config->forwarded_connect_retries);
+
+ return fd;
+}
+
#ifdef HAVE_RFC2553
/* Getaddrinfo implementation */
-jb_socket connect_to(const char *host, int portnum, struct client_state *csp)
+static jb_socket rfc2553_connect_to(const char *host, int portnum, struct client_state *csp)
{
struct addrinfo hints, *result, *rp;
char service[6];
int retval;
jb_socket fd;
+#ifdef HAVE_POLL
+ struct pollfd poll_fd[1];
+#else
fd_set wfds;
- struct timeval tv[1];
-#if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
+ struct timeval timeout;
+#endif
+#if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
int flags;
-#endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
+#endif
int connect_failed;
+ /*
+ * XXX: Initializeing it here is only necessary
+ * because not all situations are properly
+ * covered yet.
+ */
+ int socket_error = 0;
#ifdef FEATURE_ACL
struct access_control_addr dst[1];
#endif /* def FEATURE_ACL */
+ /* Don't leak memory when retrying. */
+ freez(csp->error_message);
+ freez(csp->http->host_ip_addr_str);
+
retval = snprintf(service, sizeof(service), "%d", portnum);
if ((-1 == retval) || (sizeof(service) <= retval))
{
log_error(LOG_LEVEL_ERROR,
"Port number (%d) ASCII decimal representation doesn't fit into 6 bytes",
portnum);
+ csp->error_message = strdup("Invalid port number");
csp->http->host_ip_addr_str = strdup("unknown");
return(JB_INVALID_SOCKET);
}
memset((char *)&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
- hints.ai_flags = AI_ADDRCONFIG | AI_NUMERICSERV; /* avoid service look-up */
+ hints.ai_flags = AI_NUMERICSERV; /* avoid service look-up */
+#ifdef AI_ADDRCONFIG
+ hints.ai_flags |= AI_ADDRCONFIG;
+#endif
if ((retval = getaddrinfo(host, service, &hints, &result)))
{
log_error(LOG_LEVEL_INFO,
"Can not resolve %s: %s", host, gai_strerror(retval));
+ /* XXX: Should find a better way to propagate this error. */
+ errno = EINVAL;
+ csp->error_message = strdup(gai_strerror(retval));
csp->http->host_ip_addr_str = strdup("unknown");
return(JB_INVALID_SOCKET);
}
+ csp->http->host_ip_addr_str = malloc_or_die(NI_MAXHOST);
+
for (rp = result; rp != NULL; rp = rp->ai_next)
{
if (block_acl(dst, csp))
{
#ifdef __OS2__
- errno = SOCEPERM;
+ socket_error = errno = SOCEPERM;
#else
- errno = EPERM;
+ socket_error = errno = EPERM;
#endif
continue;
}
#endif /* def FEATURE_ACL */
- csp->http->host_ip_addr_str = malloc(NI_MAXHOST);
retval = getnameinfo(rp->ai_addr, rp->ai_addrlen,
csp->http->host_ip_addr_str, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
- if (!csp->http->host_ip_addr_str || retval)
+ if (retval)
{
log_error(LOG_LEVEL_ERROR,
- "Can not save csp->http->host_ip_addr_str: %s",
- (csp->http->host_ip_addr_str) ?
- gai_strerror(retval) : "Insufficient memory");
- freez(csp->http->host_ip_addr_str);
+ "Failed to get the host name from the socket structure: %s",
+ gai_strerror(retval));
continue;
}
+ fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
#ifdef _WIN32
- if ((fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol)) ==
- JB_INVALID_SOCKET)
+ if (fd == JB_INVALID_SOCKET)
#else
- if ((fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol)) < 0)
+ if (fd < 0)
#endif
{
continue;
}
-#ifdef TCP_NODELAY
- { /* turn off TCP coalescence */
- int mi = 1;
- setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
+#ifndef HAVE_POLL
+#ifndef _WIN32
+ if (fd >= FD_SETSIZE)
+ {
+ log_error(LOG_LEVEL_ERROR,
+ "Server socket number too high to use select(): %d >= %d",
+ fd, FD_SETSIZE);
+ close_socket(fd);
+ freeaddrinfo(result);
+ return JB_INVALID_SOCKET;
}
-#endif /* def TCP_NODELAY */
+#endif
+#endif
+
+#ifdef FEATURE_EXTERNAL_FILTERS
+ mark_socket_for_close_on_execute(fd);
+#endif
+
+ set_no_delay_flag(fd);
#if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
connect_failed = 0;
while (connect(fd, rp->ai_addr, rp->ai_addrlen) == JB_INVALID_SOCKET)
{
+#ifdef __OS2__
+ errno = sock_errno();
+#endif /* __OS2__ */
+
#ifdef _WIN32
if (errno == WSAEINPROGRESS)
-#elif __OS2__
- if (sock_errno() == EINPROGRESS)
#else /* ifndef _WIN32 */
if (errno == EINPROGRESS)
#endif /* ndef _WIN32 || __OS2__ */
break;
}
-#ifdef __OS2__
- if (sock_errno() != EINTR)
-#else
if (errno != EINTR)
-#endif /* __OS2__ */
{
+ socket_error = errno;
close_socket(fd);
connect_failed = 1;
break;
}
#endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
+#ifdef HAVE_POLL
+ poll_fd[0].fd = fd;
+ poll_fd[0].events = POLLOUT;
+
+ if (poll(poll_fd, 1, 30000) > 0)
+#else
/* wait for connection to complete */
FD_ZERO(&wfds);
FD_SET(fd, &wfds);
- tv->tv_sec = 30;
- tv->tv_usec = 0;
+ memset(&timeout, 0, sizeof(timeout));
+ timeout.tv_sec = 30;
- /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
- if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
+ /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Weird! */
+ if ((select((int)fd + 1, NULL, &wfds, NULL, &timeout) > 0)
+ && FD_ISSET(fd, &wfds))
+#endif
{
- close_socket(fd);
- continue;
+ socklen_t optlen = sizeof(socket_error);
+ if (!getsockopt(fd, SOL_SOCKET, SO_ERROR, &socket_error, &optlen))
+ {
+ if (!socket_error)
+ {
+ /* Connection established, no need to try other addresses. */
+ break;
+ }
+ if (rp->ai_next != NULL)
+ {
+ /*
+ * There's another address we can try, so log that this
+ * one didn't work out. If the last one fails, too,
+ * it will get logged outside the loop body so we don't
+ * have to mention it here.
+ */
+ log_error(LOG_LEVEL_CONNECT, "Could not connect to [%s]:%s: %s.",
+ csp->http->host_ip_addr_str, service, strerror(socket_error));
+ }
+ }
+ else
+ {
+ socket_error = errno;
+ log_error(LOG_LEVEL_ERROR, "Could not get the state of "
+ "the connection to [%s]:%s: %s; dropping connection.",
+ csp->http->host_ip_addr_str, service, strerror(errno));
+ }
}
- break; /* for; Connection established; don't try other addresses */
+ /* Connection failed, try next address */
+ close_socket(fd);
}
freeaddrinfo(result);
if (!rp)
{
- log_error(LOG_LEVEL_INFO,
- "Could not connect to TCP/[%s]:%s", host, service);
+ log_error(LOG_LEVEL_CONNECT, "Could not connect to [%s]:%s: %s.",
+ host, service, strerror(socket_error));
+ csp->error_message = strdup(strerror(socket_error));
return(JB_INVALID_SOCKET);
}
- /*
- * XXX: Current connection verification (EINPROGRESS && select()
- * for writing) is not sufficient. E.g. on Linux-2.6.27 with glibc-2.6
- * select returns socket ready for writing, however subsequential
- * write(2) fails with ENOCONNECT. Read Linux connect(2) man page
- * about non-blocking sockets.
- * Thus we can't log here that the socket is connected.
- */
- /* log_error(LOG_LEVEL_INFO, "Connected to TCP/[%s]:%s", host, service); */
+ log_error(LOG_LEVEL_CONNECT, "Connected to %s[%s]:%s.",
+ host, csp->http->host_ip_addr_str, service);
return(fd);
#else /* ndef HAVE_RFC2553 */
/* Pre-getaddrinfo implementation */
-jb_socket connect_to(const char *host, int portnum, struct client_state *csp)
+static jb_socket no_rfc2553_connect_to(const char *host, int portnum, struct client_state *csp)
{
struct sockaddr_in inaddr;
jb_socket fd;
unsigned int addr;
+#ifdef HAVE_POLL
+ struct pollfd poll_fd[1];
+#else
fd_set wfds;
struct timeval tv[1];
-#if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
+#endif
+#if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
int flags;
-#endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
+#endif
#ifdef FEATURE_ACL
struct access_control_addr dst[1];
#endif /* def FEATURE_ACL */
+ /* Don't leak memory when retrying. */
+ freez(csp->http->host_ip_addr_str);
+
memset((char *)&inaddr, 0, sizeof inaddr);
if ((addr = resolve_hostname_to_ip(host)) == INADDR_NONE)
}
#endif /* ndef _WIN32 */
+ fd = socket(inaddr.sin_family, SOCK_STREAM, 0);
#ifdef _WIN32
- if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) == JB_INVALID_SOCKET)
+ if (fd == JB_INVALID_SOCKET)
#else
- if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) < 0)
+ if (fd < 0)
#endif
{
return(JB_INVALID_SOCKET);
}
-#ifdef TCP_NODELAY
- { /* turn off TCP coalescence */
- int mi = 1;
- setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
+#ifndef HAVE_POLL
+#ifndef _WIN32
+ if (fd >= FD_SETSIZE)
+ {
+ log_error(LOG_LEVEL_ERROR,
+ "Server socket number too high to use select(): %d >= %d",
+ fd, FD_SETSIZE);
+ close_socket(fd);
+ return JB_INVALID_SOCKET;
}
-#endif /* def TCP_NODELAY */
+#endif
+#endif
+
+ set_no_delay_flag(fd);
#if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
{
flags |= O_NDELAY;
fcntl(fd, F_SETFL, flags);
+#ifdef FEATURE_EXTERNAL_FILTERS
+ mark_socket_for_close_on_execute(fd);
+#endif
}
#endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
{
#ifdef _WIN32
if (errno == WSAEINPROGRESS)
-#elif __OS2__
+#elif __OS2__
if (sock_errno() == EINPROGRESS)
#else /* ifndef _WIN32 */
if (errno == EINPROGRESS)
break;
}
-#ifdef __OS2__
+#ifdef __OS2__
if (sock_errno() != EINTR)
#else
if (errno != EINTR)
}
#endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
+#ifdef HAVE_POLL
+ poll_fd[0].fd = fd;
+ poll_fd[0].events = POLLOUT;
+
+ if (poll(poll_fd, 1, 30000) <= 0)
+#else
/* 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(). Wierd! */
+ /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Weird! */
if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
+#endif
{
close_socket(fd);
return(JB_INVALID_SOCKET);
return 0;
}
- if (len < 0) /* constant condition - size_t isn't ever negative */
+#ifdef FUZZ
+ if (!daemon_mode && fd <= 3)
{
- return 1;
+ log_error(LOG_LEVEL_WRITING, "Pretending to write to socket %d: %N", fd, len, buf);
+ return 0;
}
+#endif
- log_error(LOG_LEVEL_LOG, "%N", len, buf);
+ log_error(LOG_LEVEL_WRITING, "to socket %d: %N", fd, len, buf);
#if defined(_WIN32)
return (send(fd, buf, (int)len, 0) != (int)len);
*/
#define SOCKET_SEND_MAX 65000
{
- int write_len = 0, send_len, send_rc = 0, i = 0;
+ int send_len, send_rc = 0, i = 0;
while ((i < len) && (send_rc != -1))
{
if ((i + SOCKET_SEND_MAX) > len)
*********************************************************************/
int read_socket(jb_socket fd, char *buf, int len)
{
+ int ret;
+
if (len <= 0)
{
return(0);
}
#if defined(_WIN32)
- return(recv(fd, buf, len, 0));
+ ret = recv(fd, buf, len, 0);
#elif defined(__BEOS__) || defined(AMIGA) || defined(__OS2__)
- return(recv(fd, buf, (size_t)len, 0));
+ ret = recv(fd, buf, (size_t)len, 0);
#else
- return(read(fd, buf, (size_t)len));
+ 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;
}
*********************************************************************/
int data_is_available(jb_socket fd, int seconds_to_wait)
{
+ int n;
+ char buf[10];
+#ifdef HAVE_POLL
+ struct pollfd poll_fd[1];
+
+ poll_fd[0].fd = fd;
+ poll_fd[0].events = POLLIN;
+
+ n = poll(poll_fd, 1, seconds_to_wait * 1000);
+#else
fd_set rfds;
struct timeval timeout;
- int n;
memset(&timeout, 0, sizeof(timeout));
timeout.tv_sec = seconds_to_wait;
FD_SET(fd, &rfds);
n = select(fd+1, &rfds, NULL, NULL, &timeout);
+#endif
/*
* XXX: Do we care about the different error conditions?
*/
- return (n == 1);
+ return ((n == 1) && (1 == recv(fd, buf, 1, MSG_PEEK)));
}
#if defined(_WIN32) || defined(__BEOS__)
closesocket(fd);
#elif defined(AMIGA)
- CloseSocket(fd);
+ CloseSocket(fd);
#elif defined(__OS2__)
soclose(fd);
#else
close(fd);
#endif
+}
+
+
+/*********************************************************************
+ *
+ * Function : drain_and_close_socket
+ *
+ * Description : Closes a TCP/IP socket after draining unread data
+ *
+ * Parameters :
+ * 1 : fd = file descriptor of the socket to be closed
+ *
+ * Returns : void
+ *
+ *********************************************************************/
+void drain_and_close_socket(jb_socket fd)
+{
+#ifdef FEATURE_CONNECTION_KEEP_ALIVE
+ if (socket_is_still_alive(fd))
+#endif
+ {
+ int bytes_drained_total = 0;
+ int bytes_drained;
+
+#ifdef HAVE_SHUTDOWN
+/* Apparently Windows has shutdown() but not SHUT_WR. */
+#ifndef SHUT_WR
+#define SHUT_WR 1
+#endif
+ if (0 != shutdown(fd, SHUT_WR))
+ {
+ log_error(LOG_LEVEL_CONNECT, "Failed to shutdown socket %d: %E", fd);
+ }
+#endif
+#define ARBITRARY_DRAIN_LIMIT 10000
+ do
+ {
+ char drainage[500];
+
+ if (!data_is_available(fd, 0))
+ {
+ /*
+ * If there is no data available right now, don't try
+ * to drain the socket as read_socket() could block.
+ */
+ break;
+ }
+
+ bytes_drained = read_socket(fd, drainage, sizeof(drainage));
+ if (bytes_drained < 0)
+ {
+ log_error(LOG_LEVEL_CONNECT, "Failed to drain socket %d: %E", fd);
+ }
+ else if (bytes_drained > 0)
+ {
+ bytes_drained_total += bytes_drained;
+ if (bytes_drained_total > ARBITRARY_DRAIN_LIMIT)
+ {
+ log_error(LOG_LEVEL_CONNECT, "Giving up draining socket %d", fd);
+ break;
+ }
+ }
+ } while (bytes_drained > 0);
+ if (bytes_drained_total != 0)
+ {
+ log_error(LOG_LEVEL_CONNECT,
+ "Drained %d bytes before closing socket %d", bytes_drained_total, fd);
+ }
+ }
+
+ close_socket(fd);
}
}
memset(&hints, 0, sizeof(struct addrinfo));
- if ((hostnam == NULL) || !strcmpic(hostnam, "localhost"))
+ if (hostnam == NULL)
{
/*
* XXX: This is a hack. The right thing to do
hints.ai_family = AF_UNSPEC;
}
hints.ai_socktype = SOCK_STREAM;
- hints.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
- hints.ai_protocol = 0; /* Realy any stream protocol or TCP only */
+ 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;
#endif
}
+#ifdef FEATURE_EXTERNAL_FILTERS
+ mark_socket_for_close_on_execute(fd);
+#endif
+
#ifndef _WIN32
/*
* This is not needed for Win32 - in fact, it stops
{
if (errno != EINTR)
{
+ close_socket(fd);
return(-1);
}
}
* 1 : afd = File descriptor returned from accept().
* 2 : ip_address = Pointer to return the pointer to
* the ip address string.
- * 3 : hostname = Pointer to return the pointer to
+ * 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 **hostname)
+void get_host_information(jb_socket afd, char **ip_address, char **port,
+ char **hostname)
{
#ifdef HAVE_RFC2553
struct sockaddr_storage server;
struct sockaddr_in server;
struct hostent *host = NULL;
#endif /* HAVE_RFC2553 */
-#if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
+#if defined(_WIN32) || defined(__OS2__) || defined(AMIGA)
/* according to accept_connection() this fixes a warning. */
int s_length, s_length_provided;
#else
*hostname = NULL;
}
*ip_address = NULL;
+ *port = NULL;
if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
{
log_error(LOG_LEVEL_ERROR, "getsockname() truncated server address");
return;
}
+/*
+ * XXX: Workaround for missing header on Windows when
+ * configured with --disable-ipv6-support.
+ * The proper fix is to not use NI_MAXSERV in
+ * that case. It works by accident on other platforms
+ * as <netdb.h> is included unconditionally there.
+ */
+#ifndef NI_MAXSERV
+#define NI_MAXSERV 32
+#endif
+ *port = malloc_or_die(NI_MAXSERV);
+
#ifdef HAVE_RFC2553
- *ip_address = malloc(NI_MAXHOST);
+ *ip_address = malloc_or_die(NI_MAXHOST);
retval = getnameinfo((struct sockaddr *) &server, s_length,
- *ip_address, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
+ *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)
{
}
#ifdef HAVE_RFC2553
- *hostname = malloc(NI_MAXHOST);
+ *hostname = malloc_or_die(NI_MAXHOST);
retval = getnameinfo((struct sockaddr *) &server, s_length,
*hostname, NI_MAXHOST, NULL, 0, NI_NAMEREQD);
if (retval)
{
host = NULL;
}
-#elif FEATURE_PTHREAD
+#elif defined(MUTEX_LOCKS_AVAILABLE)
privoxy_mutex_lock(&resolver_mutex);
- host = gethostbyaddr((const char *)&server.sin_addr,
+ 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,
+ host = gethostbyaddr((const char *)&server.sin_addr,
sizeof(server.sin_addr), AF_INET);
#endif
if (host == NULL)
*
* Function : accept_connection
*
- * Description : Accepts a connection on a socket. Socket must have
- * been created using bind_port().
+ * 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 : fd = file descriptor returned from bind_port
+ * 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 fd)
+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)
- int retval;
#else
struct sockaddr_in client;
#endif
jb_socket afd;
-#if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
+#if defined(_WIN32) || defined(__OS2__) || defined(AMIGA)
/* Wierdness - fix a warning. */
int c_length;
#else
socklen_t c_length;
#endif
+ int retval;
+ int i;
+ int max_selected_socket;
+#ifdef HAVE_POLL
+ struct pollfd poll_fds[MAX_LISTENING_SOCKETS];
+ nfds_t polled_sockets;
+#else
+ fd_set selected_fds;
+#endif
+ jb_socket fd;
+ const char *host_addr;
+ size_t listen_addr_size;
c_length = sizeof(client);
+#ifdef HAVE_POLL
+ memset(poll_fds, 0, sizeof(poll_fds));
+ polled_sockets = 0;
+#else
+ /*
+ * 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);
+#endif
+ max_selected_socket = 0;
+ for (i = 0; i < MAX_LISTENING_SOCKETS; i++)
+ {
+ if (JB_INVALID_SOCKET != fds[i])
+ {
+#ifdef HAVE_POLL
+ poll_fds[i].fd = fds[i];
+ poll_fds[i].events = POLLIN;
+ polled_sockets++;
+#else
+ FD_SET(fds[i], &selected_fds);
+#endif
+ if (max_selected_socket < fds[i] + 1)
+ {
+ max_selected_socket = fds[i] + 1;
+ }
+ }
+ }
+ if (0 == max_selected_socket)
+ {
+ return 0;
+ }
+ do
+ {
+#ifdef HAVE_POLL
+ retval = poll(poll_fds, polled_sockets, -1);
+#else
+ retval = select(max_selected_socket, &selected_fds, NULL, NULL, NULL);
+#endif
+ } 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;
+ }
+#ifdef HAVE_POLL
+ for (i = 0; i < MAX_LISTENING_SOCKETS && (poll_fds[i].revents == 0); i++);
+#else
+ for (i = 0; i < MAX_LISTENING_SOCKETS && !FD_ISSET(fds[i], &selected_fds);
+ i++);
+#endif
+ 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)
#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);
+ } while (afd < 0 && errno == EINTR);
if (afd < 0)
{
return 0;
}
#endif
+#ifdef SO_LINGER
+ {
+ struct linger linger_options;
+ linger_options.l_onoff = 1;
+ linger_options.l_linger = 5;
+ if (0 != setsockopt(afd, SOL_SOCKET, SO_LINGER, &linger_options, sizeof(linger_options)))
+ {
+ log_error(LOG_LEVEL_ERROR, "Setting SO_LINGER on socket %d failed.", afd);
+ }
+ }
+#endif
+
+#ifndef HAVE_POLL
+#ifndef _WIN32
+ if (afd >= FD_SETSIZE)
+ {
+ log_error(LOG_LEVEL_ERROR,
+ "Client socket number too high to use select(): %d >= %d",
+ afd, FD_SETSIZE);
+ close_socket(afd);
+ return 0;
+ }
+#endif
+#endif
+
+#ifdef FEATURE_EXTERNAL_FILTERS
+ mark_socket_for_close_on_execute(afd);
+#endif
+
+ set_no_delay_flag(afd);
+
csp->cfd = afd;
#ifdef HAVE_RFC2553
- csp->ip_addr_str = malloc(NI_MAXHOST);
+ csp->ip_addr_str = malloc_or_die(NI_MAXHOST);
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");
+ (csp->ip_addr_str) ? gai_strerror(retval) : "Insuffcient memory");
freez(csp->ip_addr_str);
}
#undef client
csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
#endif /* def HAVE_RFC2553 */
+ /*
+ * Save the name and port of the accepting socket for later lookup.
+ *
+ * The string needs space for strlen(...) + 7 characters:
+ * strlen(haddr[i]) + 1 (':') + 5 (port digits) + 1 ('\0')
+ */
+ host_addr = (csp->config->haddr[i] != NULL) ? csp->config->haddr[i] : "";
+ listen_addr_size = strlen(host_addr) + 7;
+ csp->listen_addr_str = malloc_or_die(listen_addr_size);
+ retval = snprintf(csp->listen_addr_str, listen_addr_size,
+ "%s:%d", host_addr, csp->config->hport[i]);
+ if ((-1 == retval) || listen_addr_size <= retval)
+ {
+ log_error(LOG_LEVEL_ERROR,
+ "Server name (%s) and port number (%d) ASCII decimal representation"
+ "don't fit into %d bytes",
+ host_addr, csp->config->hport[i], listen_addr_size);
+ return 0;
+ }
+
return 1;
}
* Parameters :
* 1 : host = hostname to resolve
*
- * Returns : INADDR_NONE => failure, INADDR_ANY or tcp/ip address if succesful.
+ * 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;
- unsigned int dns_retries = 0;
#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)
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);
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);
{
hostp = NULL;
}
-#elif FEATURE_PTHREAD
+#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);
errno = WSAEPROTOTYPE;
#else
errno = EPROTOTYPE;
-#endif
+#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)
- );
+ memcpy((char *)&inaddr.sin_addr, (char *)hostp->h_addr, sizeof(inaddr.sin_addr));
}
return(inaddr.sin_addr.s_addr);
}
+/*********************************************************************
+ *
+ * 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)));
+}
+
+
+#ifdef FEATURE_EXTERNAL_FILTERS
+/*********************************************************************
+ *
+ * Function : mark_socket_for_close_on_execute
+ *
+ * Description : Marks a socket for close on execute.
+ *
+ * Used so that external filters have no direct
+ * access to sockets they shouldn't care about.
+ *
+ * Not implemented for all platforms.
+ *
+ * Parameters :
+ * 1 : fd = The socket to mark
+ *
+ * Returns : void.
+ *
+ *********************************************************************/
+void mark_socket_for_close_on_execute(jb_socket fd)
+{
+#ifdef FEATURE_PTHREAD
+ int ret;
+
+ ret = fcntl(fd, F_SETFD, FD_CLOEXEC);
+
+ if (ret == -1)
+ {
+ log_error(LOG_LEVEL_ERROR,
+ "fcntl(%d, F_SETFD, FD_CLOEXEC) failed", fd);
+ }
+#else
+#warning "Sockets will be visible to external filters"
+#endif
+}
+#endif /* def FEATURE_EXTERNAL_FILTERS */
+
/*
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projects / privoxy.git / blobdiff