1055 lines
32 KiB
C
1055 lines
32 KiB
C
const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.50 2008/12/20 14:53:55 fabiankeil Exp $";
|
||
/*********************************************************************
|
||
*
|
||
* File : $Source: /cvsroot/ijbswa/current/jbsockets.c,v $
|
||
*
|
||
* Purpose : Contains wrappers for system-specific sockets code,
|
||
* so that the rest of Junkbuster can be more
|
||
* OS-independent. Contains #ifdefs to make this work
|
||
* on many platforms.
|
||
*
|
||
* Copyright : Written by and Copyright (C) 2001-2007 the SourceForge
|
||
* Privoxy team. http://www.privoxy.org/
|
||
*
|
||
* Based on the Internet Junkbuster originally written
|
||
* by and Copyright (C) 1997 Anonymous Coders and
|
||
* Junkbusters Corporation. http://www.junkbusters.com
|
||
*
|
||
* 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
|
||
* your option) any later version.
|
||
*
|
||
* This program is distributed in the hope that it will
|
||
* be useful, but WITHOUT ANY WARRANTY; without even the
|
||
* implied warranty of MERCHANTABILITY or FITNESS FOR A
|
||
* PARTICULAR PURPOSE. See the GNU General Public
|
||
* License for more details.
|
||
*
|
||
* The GNU General Public License should be included with
|
||
* this file. If not, you can view it at
|
||
* http://www.gnu.org/copyleft/gpl.html
|
||
* or write to the Free Software Foundation, Inc., 59
|
||
* Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
||
*
|
||
* Revisions :
|
||
* $Log: jbsockets.c,v $
|
||
* Revision 1.50 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:
|
||
http://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
|
||
pthreads 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
|
||
*
|
||
*
|
||
*********************************************************************/
|
||
|
||
|
||
#include "config.h"
|
||
|
||
#include <stdlib.h>
|
||
#include <stdio.h>
|
||
#include <string.h>
|
||
#include <errno.h>
|
||
#include <fcntl.h>
|
||
#include <sys/types.h>
|
||
|
||
#ifdef _WIN32
|
||
|
||
#ifndef STRICT
|
||
#define STRICT
|
||
#endif
|
||
#include <windows.h>
|
||
#include <sys/timeb.h>
|
||
#include <io.h>
|
||
|
||
#else
|
||
|
||
#ifndef __OS2__
|
||
#include <unistd.h>
|
||
#endif
|
||
#include <sys/time.h>
|
||
#include <netinet/in.h>
|
||
#include <sys/ioctl.h>
|
||
#include <netdb.h>
|
||
#include <sys/socket.h>
|
||
|
||
#ifndef __BEOS__
|
||
#include <netinet/tcp.h>
|
||
#ifndef __OS2__
|
||
#include <arpa/inet.h>
|
||
#endif
|
||
#else
|
||
#include <socket.h>
|
||
#endif
|
||
|
||
#if defined(__EMX__) || defined (__OS2__)
|
||
#include <sys/select.h> /* OS/2/EMX needs a little help with select */
|
||
#ifdef __OS2__
|
||
#include <nerrno.h>
|
||
#endif
|
||
#endif
|
||
|
||
#endif
|
||
|
||
#include "project.h"
|
||
|
||
#ifdef FEATURE_PTHREAD
|
||
#include "jcc.h"
|
||
/* jcc.h is for mutex semaphores only */
|
||
#endif /* def FEATURE_PTHREAD */
|
||
|
||
#include "jbsockets.h"
|
||
#include "filters.h"
|
||
#include "errlog.h"
|
||
|
||
const char jbsockets_h_rcs[] = JBSOCKETS_H_VERSION;
|
||
|
||
/*
|
||
* Maximum number of gethostbyname(_r) retries in case of
|
||
* soft errors (TRY_AGAIN).
|
||
* XXX: Does it make sense to make this a config option?
|
||
*/
|
||
#define MAX_DNS_RETRIES 10
|
||
|
||
#define MAX_LISTEN_BACKLOG 128
|
||
|
||
|
||
/*********************************************************************
|
||
*
|
||
* Function : connect_to
|
||
*
|
||
* Description : Open a socket and connect to it. Will check
|
||
* that this is allowed according to ACL.
|
||
*
|
||
* Parameters :
|
||
* 1 : host = hostname to connect to
|
||
* 2 : portnum = port to connent on (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)
|
||
{
|
||
struct sockaddr_in inaddr;
|
||
jb_socket fd;
|
||
unsigned int addr;
|
||
fd_set wfds;
|
||
struct timeval tv[1];
|
||
#if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
|
||
int flags;
|
||
#endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
|
||
|
||
#ifdef FEATURE_ACL
|
||
struct access_control_addr dst[1];
|
||
#endif /* def FEATURE_ACL */
|
||
|
||
memset((char *)&inaddr, 0, sizeof inaddr);
|
||
|
||
if ((addr = resolve_hostname_to_ip(host)) == INADDR_NONE)
|
||
{
|
||
csp->http->host_ip_addr_str = strdup("unknown");
|
||
return(JB_INVALID_SOCKET);
|
||
}
|
||
|
||
#ifdef FEATURE_ACL
|
||
dst->addr = ntohl(addr);
|
||
dst->port = portnum;
|
||
|
||
if (block_acl(dst, csp))
|
||
{
|
||
#ifdef __OS2__
|
||
errno = SOCEPERM;
|
||
#else
|
||
errno = EPERM;
|
||
#endif
|
||
return(JB_INVALID_SOCKET);
|
||
}
|
||
#endif /* def FEATURE_ACL */
|
||
|
||
inaddr.sin_addr.s_addr = addr;
|
||
inaddr.sin_family = AF_INET;
|
||
csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
|
||
|
||
#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 */
|
||
|
||
#ifdef _WIN32
|
||
if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) == JB_INVALID_SOCKET)
|
||
#else
|
||
if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) < 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));
|
||
}
|
||
#endif /* def TCP_NODELAY */
|
||
|
||
#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);
|
||
}
|
||
#endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
|
||
|
||
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__ */
|
||
{
|
||
break;
|
||
}
|
||
|
||
#ifdef __OS2__
|
||
if (sock_errno() != EINTR)
|
||
#else
|
||
if (errno != EINTR)
|
||
#endif /* __OS2__ */
|
||
{
|
||
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(). Wierd! */
|
||
if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
|
||
{
|
||
close_socket(fd);
|
||
return(JB_INVALID_SOCKET);
|
||
}
|
||
return(fd);
|
||
|
||
}
|
||
|
||
|
||
/*********************************************************************
|
||
*
|
||
* 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;
|
||
}
|
||
|
||
if (len < 0) /* constant condition - size_t isn't ever negative */
|
||
{
|
||
return 1;
|
||
}
|
||
|
||
log_error(LOG_LEVEL_LOG, "%N", 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 write_len = 0, 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)
|
||
{
|
||
if (len <= 0)
|
||
{
|
||
return(0);
|
||
}
|
||
|
||
#if defined(_WIN32)
|
||
return(recv(fd, buf, len, 0));
|
||
#elif defined(__BEOS__) || defined(AMIGA) || defined(__OS2__)
|
||
return(recv(fd, buf, (size_t)len, 0));
|
||
#else
|
||
return(read(fd, buf, (size_t)len));
|
||
#endif
|
||
}
|
||
|
||
|
||
/*********************************************************************
|
||
*
|
||
* 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)
|
||
{
|
||
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);
|
||
}
|
||
|
||
|
||
/*********************************************************************
|
||
*
|
||
* 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)
|
||
{
|
||
struct sockaddr_in inaddr;
|
||
jb_socket fd;
|
||
#ifndef _WIN32
|
||
int one = 1;
|
||
#endif /* ndef _WIN32 */
|
||
|
||
*pfd = JB_INVALID_SOCKET;
|
||
|
||
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 */
|
||
|
||
fd = socket(AF_INET, SOCK_STREAM, 0);
|
||
|
||
#ifdef _WIN32
|
||
if (fd == JB_INVALID_SOCKET)
|
||
#else
|
||
if (fd < 0)
|
||
#endif
|
||
{
|
||
return(-1);
|
||
}
|
||
|
||
#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 */
|
||
|
||
if (bind(fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
|
||
{
|
||
#ifdef _WIN32
|
||
errno = WSAGetLastError();
|
||
if (errno == WSAEADDRINUSE)
|
||
#else
|
||
if (errno == EADDRINUSE)
|
||
#endif
|
||
{
|
||
close_socket(fd);
|
||
return(-3);
|
||
}
|
||
else
|
||
{
|
||
close_socket(fd);
|
||
return(-1);
|
||
}
|
||
}
|
||
|
||
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 : 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)
|
||
{
|
||
struct sockaddr_in server;
|
||
struct hostent *host = NULL;
|
||
#if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
|
||
/* according to accept_connection() this fixes a warning. */
|
||
int s_length;
|
||
#else
|
||
socklen_t s_length;
|
||
#endif
|
||
#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 */
|
||
s_length = sizeof(server);
|
||
|
||
if (NULL != hostname)
|
||
{
|
||
*hostname = NULL;
|
||
}
|
||
*ip_address = NULL;
|
||
|
||
if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
|
||
{
|
||
*ip_address = strdup(inet_ntoa(server.sin_addr));
|
||
|
||
if (NULL == hostname)
|
||
{
|
||
/*
|
||
* We're done here, the caller isn't
|
||
* interested in knowing the hostname.
|
||
*/
|
||
return;
|
||
}
|
||
#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 FEATURE_PTHREAD
|
||
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);
|
||
}
|
||
}
|
||
|
||
return;
|
||
}
|
||
|
||
|
||
/*********************************************************************
|
||
*
|
||
* Function : accept_connection
|
||
*
|
||
* Description : Accepts a connection on a socket. Socket 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
|
||
*
|
||
* 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)
|
||
{
|
||
struct sockaddr_in client;
|
||
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
|
||
|
||
c_length = sizeof(client);
|
||
|
||
#ifdef _WIN32
|
||
afd = accept (fd, (struct sockaddr *) &client, &c_length);
|
||
if (afd == JB_INVALID_SOCKET)
|
||
{
|
||
return 0;
|
||
}
|
||
#else
|
||
do
|
||
{
|
||
afd = accept (fd, (struct sockaddr *) &client, &c_length);
|
||
} while (afd < 1 && errno == EINTR);
|
||
if (afd < 0)
|
||
{
|
||
return 0;
|
||
}
|
||
#endif
|
||
|
||
csp->cfd = afd;
|
||
csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
|
||
csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
|
||
|
||
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 succesful.
|
||
*
|
||
*********************************************************************/
|
||
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)
|
||
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)
|
||
{
|
||
#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 FEATURE_PTHREAD
|
||
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);
|
||
|
||
}
|
||
|
||
|
||
/*
|
||
Local Variables:
|
||
tab-width: 3
|
||
end:
|
||
*/
|