1 const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.35.2.3 2003/03/07 03:41:04 david__schmidt Exp $";
2 /*********************************************************************
4 * File : $Source: /cvsroot/ijbswa/current/Attic/jbsockets.c,v $
6 * Purpose : Contains wrappers for system-specific sockets code,
7 * so that the rest of Junkbuster can be more
8 * OS-independent. Contains #ifdefs to make this work
11 * Copyright : Written by and Copyright (C) 2001 the SourceForge
12 * Privoxy team. http://www.privoxy.org/
14 * Based on the Internet Junkbuster originally written
15 * by and Copyright (C) 1997 Anonymous Coders and
16 * Junkbusters Corporation. http://www.junkbusters.com
18 * This program is free software; you can redistribute it
19 * and/or modify it under the terms of the GNU General
20 * Public License as published by the Free Software
21 * Foundation; either version 2 of the License, or (at
22 * your option) any later version.
24 * This program is distributed in the hope that it will
25 * be useful, but WITHOUT ANY WARRANTY; without even the
26 * implied warranty of MERCHANTABILITY or FITNESS FOR A
27 * PARTICULAR PURPOSE. See the GNU General Public
28 * License for more details.
30 * The GNU General Public License should be included with
31 * this file. If not, you can view it at
32 * http://www.gnu.org/copyleft/gpl.html
33 * or write to the Free Software Foundation, Inc., 59
34 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
37 * $Log: jbsockets.c,v $
38 * Revision 1.35.2.3 2003/03/07 03:41:04 david__schmidt
39 * 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.
41 * Revision 1.35.2.2 2002/11/20 14:37:24 oes
42 * Fixed Win32 error logging in bind_port.
43 * Thanks to Oliver Stoeneberg for the hint.
45 * Revision 1.35.2.1 2002/05/26 23:41:27 joergs
46 * AmigaOS: Fixed wrong type of len in write_socket()
48 * Revision 1.35 2002/04/26 15:50:04 joergs
49 * AmigaOS: No socklen_t, added AMIGA to the systems using int instead.
51 * Revision 1.34 2002/04/08 20:31:41 swa
54 * Revision 1.33 2002/04/03 16:02:18 gliptak
55 * Correcting compile warning with older gcc
57 * Revision 1.32 2002/03/31 17:18:59 jongfoster
58 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
60 * Revision 1.31 2002/03/29 03:33:13 david__schmidt
61 * Fix Mac OSX compiler warnings
63 * Revision 1.30 2002/03/27 14:32:43 david__schmidt
64 * More compiler warning message maintenance
66 * Revision 1.29 2002/03/26 22:29:54 swa
67 * we have a new homepage!
69 * Revision 1.28 2002/03/24 13:25:43 swa
70 * name change related issues
72 * Revision 1.27 2002/03/13 00:27:05 jongfoster
75 * Revision 1.26 2002/03/11 22:07:02 david__schmidt
76 * OS/2 port maintenance:
77 * - Fixed EMX build - it had decayed a little
78 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
79 * substituted a memset for now.
81 * Revision 1.25 2002/03/09 20:03:52 jongfoster
82 * - Making various functions return int rather than size_t.
83 * (Undoing a recent change). Since size_t is unsigned on
84 * Windows, functions like read_socket that return -1 on
85 * error cannot return a size_t.
87 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
88 * crashes, and also frequently caused JB to jump to 100%
89 * CPU and stay there. (Because it thought it had just
90 * read ((unsigned)-1) == 4Gb of data...)
92 * - The signature of write_socket has changed, it now simply
93 * returns success=0/failure=nonzero.
95 * - Trying to get rid of a few warnings --with-debug on
96 * Windows, I've introduced a new type "jb_socket". This is
97 * used for the socket file descriptors. On Windows, this
98 * is SOCKET (a typedef for unsigned). Everywhere else, it's
99 * an int. The error value can't be -1 any more, so it's
100 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
101 * Windows it maps to the #define INVALID_SOCKET.)
103 * - The signature of bind_port has changed.
105 * Revision 1.24 2002/03/07 03:51:36 oes
106 * - Improved handling of failed DNS lookups
107 * - Fixed compiler warnings etc
109 * Revision 1.23 2002/03/05 00:36:01 jongfoster
110 * Fixing bug 514988 - unable to restart Junkbuster
112 * Revision 1.22 2002/03/04 02:08:02 david__schmidt
113 * Enable web editing of actions file on OS/2 (it had been broken all this time!)
115 * Revision 1.21 2002/01/09 14:32:33 oes
116 * Added support for gethostbyname_r and gethostbyaddr_r.
118 * Revision 1.20 2001/11/16 00:48:48 jongfoster
119 * Enabling duplicate-socket detection for all platforms, not
122 * Revision 1.19 2001/10/25 03:40:47 david__schmidt
123 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
124 * threads to call select() simultaneously. So, it's time to do a real, live,
125 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
126 * (native). Both versions will work, but using __OS2__ offers multi-threading.
128 * Revision 1.18 2001/09/21 23:02:02 david__schmidt
129 * Cleaning up 2 compiler warnings on OS/2.
131 * Revision 1.17 2001/09/13 20:11:46 jongfoster
132 * Fixing 2 compiler warnings under Win32
134 * Revision 1.16 2001/07/30 22:08:36 jongfoster
135 * Tidying up #defines:
136 * - All feature #defines are now of the form FEATURE_xxx
137 * - Permanently turned off WIN_GUI_EDIT
138 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
140 * Revision 1.15 2001/07/29 17:40:43 jongfoster
141 * Fixed compiler warning by adding a cast
143 * Revision 1.14 2001/07/18 13:47:59 oes
144 * Eliminated dirty hack for getsockbyname()
146 * Revision 1.13 2001/07/15 13:56:57 jongfoster
147 * Removing unused local variable.
149 * Revision 1.12 2001/07/01 17:04:11 oes
150 * Bugfix: accept_connection no longer uses the obsolete hstrerror() function
152 * Revision 1.11 2001/06/29 21:45:41 oes
153 * Indentation, CRLF->LF, Tab-> Space
155 * Revision 1.10 2001/06/29 13:29:15 oes
156 * - Added remote (server) host IP to csp->http->host_ip_addr_str
157 * - Added detection of local socket IP and fqdn
158 * - Removed logentry from cancelled commit
160 * Revision 1.9 2001/06/07 23:06:09 jongfoster
161 * The host parameter to connect_to() is now const.
163 * Revision 1.8 2001/06/03 19:12:07 oes
166 * Revision 1.7 2001/05/28 16:14:00 jongfoster
167 * Fixing bug in LOG_LEVEL_LOG
169 * Revision 1.6 2001/05/26 17:28:32 jongfoster
170 * Fixed LOG_LEVEL_LOG
172 * Revision 1.5 2001/05/26 15:26:15 jongfoster
173 * ACL feature now provides more security by immediately dropping
174 * connections from untrusted hosts.
176 * Revision 1.4 2001/05/26 00:37:42 jongfoster
177 * Cosmetic indentation correction.
179 * Revision 1.3 2001/05/25 21:57:54 jongfoster
180 * Now gives a warning under Windows if you try to bind
181 * it to a port that's already in use.
183 * Revision 1.2 2001/05/17 23:01:01 oes
184 * - Cleaned CRLF's from the sources and related files
186 * Revision 1.1.1.1 2001/05/15 13:58:54 oes
187 * Initial import of version 2.9.3 source tree
190 *********************************************************************/
200 #include <sys/types.h>
208 #include <sys/timeb.h>
216 #include <sys/time.h>
217 #include <netinet/in.h>
218 #include <sys/ioctl.h>
220 #include <sys/socket.h>
223 #include <netinet/tcp.h>
225 #include <arpa/inet.h>
231 #if defined(__EMX__) || defined (__OS2__)
232 #include <sys/select.h> /* OS/2/EMX needs a little help with select */
243 /* jcc.h is for mutex semaphores only */
244 #endif /* def OSX_DARWIN */
247 #include "jbsockets.h"
251 const char jbsockets_h_rcs[] = JBSOCKETS_H_VERSION;
254 /*********************************************************************
256 * Function : connect_to
258 * Description : Open a socket and connect to it. Will check
259 * that this is allowed according to ACL.
262 * 1 : host = hostname to connect to
263 * 2 : portnum = port to connent on
264 * 3 : csp = Current client state (buffers, headers, etc...)
265 * Not modified, only used for source IP and ACL.
267 * Returns : JB_INVALID_SOCKET => failure, else it is the socket
270 *********************************************************************/
271 jb_socket connect_to(const char *host, int portnum, struct client_state *csp)
273 struct sockaddr_in inaddr;
277 struct timeval tv[1];
278 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
280 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
283 struct access_control_addr dst[1];
284 #endif /* def FEATURE_ACL */
286 memset((char *)&inaddr, 0, sizeof inaddr);
288 if ((addr = resolve_hostname_to_ip(host)) == INADDR_NONE)
290 csp->http->host_ip_addr_str = strdup("unknown");
291 return(JB_INVALID_SOCKET);
295 dst->addr = ntohl((unsigned long) addr);
298 if (block_acl(dst, csp))
305 return(JB_INVALID_SOCKET);
307 #endif /* def FEATURE_ACL */
309 inaddr.sin_addr.s_addr = addr;
310 inaddr.sin_family = AF_INET;
311 csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
314 if (sizeof(inaddr.sin_port) == sizeof(short))
315 #endif /* ndef _WIN32 */
317 inaddr.sin_port = htons((unsigned short) portnum);
322 inaddr.sin_port = htonl((unsigned long)portnum);
324 #endif /* ndef _WIN32 */
327 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) == JB_INVALID_SOCKET)
329 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) < 0)
332 return(JB_INVALID_SOCKET);
336 { /* turn off TCP coalescence */
338 setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
340 #endif /* def TCP_NODELAY */
342 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
343 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
346 fcntl(fd, F_SETFL, flags);
348 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
350 while (connect(fd, (struct sockaddr *) & inaddr, sizeof inaddr) == JB_INVALID_SOCKET)
353 if (errno == WSAEINPROGRESS)
355 if (sock_errno() == EINPROGRESS)
356 #else /* ifndef _WIN32 */
357 if (errno == EINPROGRESS)
358 #endif /* ndef _WIN32 || __OS2__ */
364 if (sock_errno() != EINTR)
370 return(JB_INVALID_SOCKET);
374 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
378 fcntl(fd, F_SETFL, flags);
380 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
382 /* wait for connection to complete */
389 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
390 if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
393 return(JB_INVALID_SOCKET);
400 /*********************************************************************
402 * Function : write_socket
404 * Description : Write the contents of buf (for n bytes) to socket fd.
407 * 1 : fd = file descriptor (aka. handle) of socket to write to.
408 * 2 : buf = pointer to data to be written.
409 * 3 : len = length of data to be written to the socket "fd".
411 * Returns : 0 on success (entire buffer sent).
414 *********************************************************************/
416 int write_socket(jb_socket fd, const char *buf, ssize_t len)
418 int write_socket(jb_socket fd, const char *buf, size_t len)
431 log_error(LOG_LEVEL_LOG, "%N", len, buf);
434 return (send(fd, buf, (int)len, 0) != (int)len);
435 #elif defined(__BEOS__) || defined(AMIGA)
436 return (send(fd, buf, len, 0) != len);
437 #elif defined(__OS2__)
439 * Break the data up into SOCKET_SEND_MAX chunks for sending...
440 * OS/2 seemed to complain when the chunks were too large.
442 #define SOCKET_SEND_MAX 65000
444 int write_len = 0, send_len, send_rc = 0, i = 0;
445 while ((i < len) && (send_rc != -1))
447 if ((i + SOCKET_SEND_MAX) > len)
450 send_len = SOCKET_SEND_MAX;
451 send_rc = send(fd,(char*)buf + i, send_len, 0);
459 return (write(fd, buf, len) != len);
465 /*********************************************************************
467 * Function : read_socket
469 * Description : Read from a TCP/IP socket in a platform independent way.
472 * 1 : fd = file descriptor of the socket to read
473 * 2 : buf = pointer to buffer where data will be written
474 * Must be >= len bytes long.
475 * 3 : len = maximum number of bytes to read
477 * Returns : On success, the number of bytes read is returned (zero
478 * indicates end of file), and the file position is advanced
479 * by this number. It is not an error if this number is
480 * smaller than the number of bytes requested; this may hap-
481 * pen for example because fewer bytes are actually available
482 * right now (maybe because we were close to end-of-file, or
483 * because we are reading from a pipe, or from a terminal,
484 * or because read() was interrupted by a signal). On error,
485 * -1 is returned, and errno is set appropriately. In this
486 * case it is left unspecified whether the file position (if
489 *********************************************************************/
490 int read_socket(jb_socket fd, char *buf, int len)
498 return(recv(fd, buf, len, 0));
499 #elif defined(__BEOS__) || defined(AMIGA) || defined(__OS2__)
500 return(recv(fd, buf, (size_t)len, 0));
502 return(read(fd, buf, (size_t)len));
507 /*********************************************************************
509 * Function : close_socket
511 * Description : Closes a TCP/IP socket
514 * 1 : fd = file descriptor of socket to be closed
518 *********************************************************************/
519 void close_socket(jb_socket fd)
521 #if defined(_WIN32) || defined(__BEOS__)
525 #elif defined(__OS2__)
534 /*********************************************************************
536 * Function : bind_port
538 * Description : Call socket, set socket options, and listen.
539 * Called by listen_loop to "boot up" our proxy address.
542 * 1 : hostnam = TCP/IP address to bind/listen to
543 * 2 : portnum = port to listen on
544 * 3 : pfd = pointer used to return file descriptor.
546 * Returns : if success, returns 0 and sets *pfd.
547 * if failure, returns -3 if address is in use,
548 * -2 if address unresolvable,
550 *********************************************************************/
551 int bind_port(const char *hostnam, int portnum, jb_socket *pfd)
553 struct sockaddr_in inaddr;
557 #endif /* ndef _WIN32 */
559 *pfd = JB_INVALID_SOCKET;
561 memset((char *)&inaddr, '\0', sizeof inaddr);
563 inaddr.sin_family = AF_INET;
564 inaddr.sin_addr.s_addr = resolve_hostname_to_ip(hostnam);
566 if (inaddr.sin_addr.s_addr == INADDR_NONE)
572 if (sizeof(inaddr.sin_port) == sizeof(short))
573 #endif /* ndef _WIN32 */
575 inaddr.sin_port = htons((unsigned short) portnum);
580 inaddr.sin_port = htonl((unsigned long) portnum);
582 #endif /* ndef _WIN32 */
584 fd = socket(AF_INET, SOCK_STREAM, 0);
587 if (fd == JB_INVALID_SOCKET)
597 * This is not needed for Win32 - in fact, it stops
598 * duplicate instances of Privoxy from being caught.
600 * On UNIX, we assume the user is sensible enough not
601 * to start Junkbuster multiple times on the same IP.
602 * Without this, stopping and restarting Privoxy
603 * from a script fails.
604 * Note: SO_REUSEADDR is meant to only take over
605 * sockets which are *not* in listen state in Linux,
606 * e.g. sockets in TIME_WAIT. YMMV.
608 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
609 #endif /* ndef _WIN32 */
611 if (bind(fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
614 errno = WSAGetLastError();
615 if (errno == WSAEADDRINUSE)
617 if (errno == EADDRINUSE)
630 while (listen(fd, 5) == -1)
644 /*********************************************************************
646 * Function : accept_connection
648 * Description : Accepts a connection on a socket. Socket must have
649 * been created using bind_port().
652 * 1 : csp = Client state, cfd, ip_addr_str, and
653 * ip_addr_long will be set by this routine.
654 * 2 : fd = file descriptor returned from bind_port
656 * Returns : when a connection is accepted, it returns 1 (TRUE).
657 * On an error it returns 0 (FALSE).
659 *********************************************************************/
660 int accept_connection(struct client_state * csp, jb_socket fd)
662 struct sockaddr_in client, server;
663 struct hostent *host = NULL;
665 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
666 /* Wierdness - fix a warning. */
667 int c_length, s_length;
669 socklen_t c_length, s_length;
671 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS) || defined(HAVE_GETHOSTBYADDR_R_7_ARGS) || defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
672 struct hostent result;
673 #if defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
674 struct hostent_data hdata;
676 char hbuf[HOSTENT_BUFFER_SIZE];
678 #endif /* def HAVE_GETHOSTBYADDR_R_5_ARGS */
679 #endif /* def HAVE_GETHOSTBYADDR_R_(8|7|5)_ARGS */
681 c_length = s_length = sizeof(client);
684 afd = accept (fd, (struct sockaddr *) &client, &c_length);
685 if (afd == JB_INVALID_SOCKET)
692 afd = accept (fd, (struct sockaddr *) &client, &c_length);
693 } while (afd < 1 && errno == EINTR);
701 * Determine the IP-Adress that the client used to reach us
702 * and the hostname associated with that address
704 if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
706 csp->my_ip_addr_str = strdup(inet_ntoa(server.sin_addr));
707 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS)
708 gethostbyaddr_r((const char *)&server.sin_addr,
709 sizeof(server.sin_addr), AF_INET,
710 &result, hbuf, HOSTENT_BUFFER_SIZE,
712 #elif defined(HAVE_GETHOSTBYADDR_R_7_ARGS)
713 host = gethostbyaddr_r((const char *)&server.sin_addr,
714 sizeof(server.sin_addr), AF_INET,
715 &result, hbuf, HOSTENT_BUFFER_SIZE, &thd_err);
716 #elif defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
717 if (0 == gethostbyaddr_r((const char *)&server.sin_addr,
718 sizeof(server.sin_addr), AF_INET,
727 #elif defined(OSX_DARWIN)
728 pthread_mutex_lock(&gethostbyaddr_mutex);
729 host = gethostbyaddr((const char *)&server.sin_addr,
730 sizeof(server.sin_addr), AF_INET);
731 pthread_mutex_unlock(&gethostbyaddr_mutex);
733 host = gethostbyaddr((const char *)&server.sin_addr,
734 sizeof(server.sin_addr), AF_INET);
738 log_error(LOG_LEVEL_ERROR, "Unable to get my own hostname: %E\n");
742 csp->my_hostname = strdup(host->h_name);
747 csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
748 csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
755 /*********************************************************************
757 * Function : resolve_hostname_to_ip
759 * Description : Resolve a hostname to an internet tcp/ip address.
760 * NULL or an empty string resolve to INADDR_ANY.
763 * 1 : host = hostname to resolve
765 * Returns : INADDR_NONE => failure, INADDR_ANY or tcp/ip address if succesful.
767 *********************************************************************/
768 unsigned long resolve_hostname_to_ip(const char *host)
770 struct sockaddr_in inaddr;
771 struct hostent *hostp;
772 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS) || defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
773 struct hostent result;
774 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
775 char hbuf[HOSTENT_BUFFER_SIZE];
777 #else /* defined(HAVE_GETHOSTBYNAME_R_3_ARGS) */
778 struct hostent_data hdata;
779 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5)_ARGS */
780 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
782 if ((host == NULL) || (*host == '\0'))
787 memset((char *) &inaddr, 0, sizeof inaddr);
789 if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
791 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS)
792 gethostbyname_r(host, &result, hbuf,
793 HOSTENT_BUFFER_SIZE, &hostp, &thd_err);
794 #elif defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
795 hostp = gethostbyname_r(host, &result, hbuf,
796 HOSTENT_BUFFER_SIZE, &thd_err);
797 #elif defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
798 if (0 == gethostbyname_r(host, &result, &hdata))
807 pthread_mutex_lock(&gethostbyname_mutex);
808 hostp = gethostbyname(host);
809 pthread_mutex_unlock(&gethostbyname_mutex);
811 hostp = gethostbyname(host);
812 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
816 log_error(LOG_LEVEL_ERROR, "could not resolve hostname %s", host);
819 if (hostp->h_addrtype != AF_INET)
822 errno = WSAEPROTOTYPE;
826 log_error(LOG_LEVEL_ERROR, "hostname %s resolves to unknown address type.", host);
830 (char *) &inaddr.sin_addr,
831 (char *) hostp->h_addr,
832 sizeof(inaddr.sin_addr)
835 return(inaddr.sin_addr.s_addr);