1 const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.35 2002/04/26 15:50:04 joergs Exp $";
2 /*********************************************************************
4 * File : $Source: /cvsroot/ijbswa/current/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 2002/04/26 15:50:04 joergs
39 * AmigaOS: No socklen_t, added AMIGA to the systems using int instead.
41 * Revision 1.34 2002/04/08 20:31:41 swa
44 * Revision 1.33 2002/04/03 16:02:18 gliptak
45 * Correcting compile warning with older gcc
47 * Revision 1.32 2002/03/31 17:18:59 jongfoster
48 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
50 * Revision 1.31 2002/03/29 03:33:13 david__schmidt
51 * Fix Mac OSX compiler warnings
53 * Revision 1.30 2002/03/27 14:32:43 david__schmidt
54 * More compiler warning message maintenance
56 * Revision 1.29 2002/03/26 22:29:54 swa
57 * we have a new homepage!
59 * Revision 1.28 2002/03/24 13:25:43 swa
60 * name change related issues
62 * Revision 1.27 2002/03/13 00:27:05 jongfoster
65 * Revision 1.26 2002/03/11 22:07:02 david__schmidt
66 * OS/2 port maintenance:
67 * - Fixed EMX build - it had decayed a little
68 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
69 * substituted a memset for now.
71 * Revision 1.25 2002/03/09 20:03:52 jongfoster
72 * - Making various functions return int rather than size_t.
73 * (Undoing a recent change). Since size_t is unsigned on
74 * Windows, functions like read_socket that return -1 on
75 * error cannot return a size_t.
77 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
78 * crashes, and also frequently caused JB to jump to 100%
79 * CPU and stay there. (Because it thought it had just
80 * read ((unsigned)-1) == 4Gb of data...)
82 * - The signature of write_socket has changed, it now simply
83 * returns success=0/failure=nonzero.
85 * - Trying to get rid of a few warnings --with-debug on
86 * Windows, I've introduced a new type "jb_socket". This is
87 * used for the socket file descriptors. On Windows, this
88 * is SOCKET (a typedef for unsigned). Everywhere else, it's
89 * an int. The error value can't be -1 any more, so it's
90 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
91 * Windows it maps to the #define INVALID_SOCKET.)
93 * - The signature of bind_port has changed.
95 * Revision 1.24 2002/03/07 03:51:36 oes
96 * - Improved handling of failed DNS lookups
97 * - Fixed compiler warnings etc
99 * Revision 1.23 2002/03/05 00:36:01 jongfoster
100 * Fixing bug 514988 - unable to restart Junkbuster
102 * Revision 1.22 2002/03/04 02:08:02 david__schmidt
103 * Enable web editing of actions file on OS/2 (it had been broken all this time!)
105 * Revision 1.21 2002/01/09 14:32:33 oes
106 * Added support for gethostbyname_r and gethostbyaddr_r.
108 * Revision 1.20 2001/11/16 00:48:48 jongfoster
109 * Enabling duplicate-socket detection for all platforms, not
112 * Revision 1.19 2001/10/25 03:40:47 david__schmidt
113 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
114 * threads to call select() simultaneously. So, it's time to do a real, live,
115 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
116 * (native). Both versions will work, but using __OS2__ offers multi-threading.
118 * Revision 1.18 2001/09/21 23:02:02 david__schmidt
119 * Cleaning up 2 compiler warnings on OS/2.
121 * Revision 1.17 2001/09/13 20:11:46 jongfoster
122 * Fixing 2 compiler warnings under Win32
124 * Revision 1.16 2001/07/30 22:08:36 jongfoster
125 * Tidying up #defines:
126 * - All feature #defines are now of the form FEATURE_xxx
127 * - Permanently turned off WIN_GUI_EDIT
128 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
130 * Revision 1.15 2001/07/29 17:40:43 jongfoster
131 * Fixed compiler warning by adding a cast
133 * Revision 1.14 2001/07/18 13:47:59 oes
134 * Eliminated dirty hack for getsockbyname()
136 * Revision 1.13 2001/07/15 13:56:57 jongfoster
137 * Removing unused local variable.
139 * Revision 1.12 2001/07/01 17:04:11 oes
140 * Bugfix: accept_connection no longer uses the obsolete hstrerror() function
142 * Revision 1.11 2001/06/29 21:45:41 oes
143 * Indentation, CRLF->LF, Tab-> Space
145 * Revision 1.10 2001/06/29 13:29:15 oes
146 * - Added remote (server) host IP to csp->http->host_ip_addr_str
147 * - Added detection of local socket IP and fqdn
148 * - Removed logentry from cancelled commit
150 * Revision 1.9 2001/06/07 23:06:09 jongfoster
151 * The host parameter to connect_to() is now const.
153 * Revision 1.8 2001/06/03 19:12:07 oes
156 * Revision 1.7 2001/05/28 16:14:00 jongfoster
157 * Fixing bug in LOG_LEVEL_LOG
159 * Revision 1.6 2001/05/26 17:28:32 jongfoster
160 * Fixed LOG_LEVEL_LOG
162 * Revision 1.5 2001/05/26 15:26:15 jongfoster
163 * ACL feature now provides more security by immediately dropping
164 * connections from untrusted hosts.
166 * Revision 1.4 2001/05/26 00:37:42 jongfoster
167 * Cosmetic indentation correction.
169 * Revision 1.3 2001/05/25 21:57:54 jongfoster
170 * Now gives a warning under Windows if you try to bind
171 * it to a port that's already in use.
173 * Revision 1.2 2001/05/17 23:01:01 oes
174 * - Cleaned CRLF's from the sources and related files
176 * Revision 1.1.1.1 2001/05/15 13:58:54 oes
177 * Initial import of version 2.9.3 source tree
180 *********************************************************************/
190 #include <sys/types.h>
198 #include <sys/timeb.h>
206 #include <sys/time.h>
207 #include <netinet/in.h>
208 #include <sys/ioctl.h>
210 #include <sys/socket.h>
213 #include <netinet/tcp.h>
215 #include <arpa/inet.h>
221 #if defined(__EMX__) || defined (__OS2__)
222 #include <sys/select.h> /* OS/2/EMX needs a little help with select */
231 #include "jbsockets.h"
235 const char jbsockets_h_rcs[] = JBSOCKETS_H_VERSION;
238 /*********************************************************************
240 * Function : connect_to
242 * Description : Open a socket and connect to it. Will check
243 * that this is allowed according to ACL.
246 * 1 : host = hostname to connect to
247 * 2 : portnum = port to connent on
248 * 3 : csp = Current client state (buffers, headers, etc...)
249 * Not modified, only used for source IP and ACL.
251 * Returns : JB_INVALID_SOCKET => failure, else it is the socket
254 *********************************************************************/
255 jb_socket connect_to(const char *host, int portnum, struct client_state *csp)
257 struct sockaddr_in inaddr;
261 struct timeval tv[1];
262 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
264 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
267 struct access_control_addr dst[1];
268 #endif /* def FEATURE_ACL */
270 memset((char *)&inaddr, 0, sizeof inaddr);
272 if ((addr = resolve_hostname_to_ip(host)) == INADDR_NONE)
274 csp->http->host_ip_addr_str = strdup("unknown");
275 return(JB_INVALID_SOCKET);
279 dst->addr = ntohl((unsigned long) addr);
282 if (block_acl(dst, csp))
289 return(JB_INVALID_SOCKET);
291 #endif /* def FEATURE_ACL */
293 inaddr.sin_addr.s_addr = addr;
294 inaddr.sin_family = AF_INET;
295 csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
298 if (sizeof(inaddr.sin_port) == sizeof(short))
299 #endif /* ndef _WIN32 */
301 inaddr.sin_port = htons((unsigned short) portnum);
306 inaddr.sin_port = htonl((unsigned long)portnum);
308 #endif /* ndef _WIN32 */
311 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) == JB_INVALID_SOCKET)
313 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) < 0)
316 return(JB_INVALID_SOCKET);
320 { /* turn off TCP coalescence */
322 setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
324 #endif /* def TCP_NODELAY */
326 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
327 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
330 fcntl(fd, F_SETFL, flags);
332 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
334 while (connect(fd, (struct sockaddr *) & inaddr, sizeof inaddr) == JB_INVALID_SOCKET)
337 if (errno == WSAEINPROGRESS)
339 if (sock_errno() == EINPROGRESS)
340 #else /* ifndef _WIN32 */
341 if (errno == EINPROGRESS)
342 #endif /* ndef _WIN32 || __OS2__ */
348 if (sock_errno() != EINTR)
354 return(JB_INVALID_SOCKET);
358 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
362 fcntl(fd, F_SETFL, flags);
364 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
366 /* wait for connection to complete */
373 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
374 if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
377 return(JB_INVALID_SOCKET);
384 /*********************************************************************
386 * Function : write_socket
388 * Description : Write the contents of buf (for n bytes) to socket fd.
391 * 1 : fd = file descriptor (aka. handle) of socket to write to.
392 * 2 : buf = pointer to data to be written.
393 * 3 : len = length of data to be written to the socket "fd".
395 * Returns : 0 on success (entire buffer sent).
398 *********************************************************************/
400 int write_socket(jb_socket fd, const char *buf, ssize_t len)
402 int write_socket(jb_socket fd, const char *buf, size_t len)
415 log_error(LOG_LEVEL_LOG, "%N", len, buf);
418 return (send(fd, buf, (int)len, 0) != (int)len);
419 #elif defined(__BEOS__) || defined(AMIGA)
420 return (send(fd, buf, len, 0) != len);
421 #elif defined(__OS2__)
423 * Break the data up into SOCKET_SEND_MAX chunks for sending...
424 * OS/2 seemed to complain when the chunks were too large.
426 #define SOCKET_SEND_MAX 65000
428 int write_len = 0, send_len, send_rc = 0, i = 0;
429 while ((i < len) && (send_rc != -1))
431 if ((i + SOCKET_SEND_MAX) > len)
434 send_len = SOCKET_SEND_MAX;
435 send_rc = send(fd,(char*)buf + i, send_len, 0);
443 return (write(fd, buf, len) != len);
449 /*********************************************************************
451 * Function : read_socket
453 * Description : Read from a TCP/IP socket in a platform independent way.
456 * 1 : fd = file descriptor of the socket to read
457 * 2 : buf = pointer to buffer where data will be written
458 * Must be >= len bytes long.
459 * 3 : len = maximum number of bytes to read
461 * Returns : On success, the number of bytes read is returned (zero
462 * indicates end of file), and the file position is advanced
463 * by this number. It is not an error if this number is
464 * smaller than the number of bytes requested; this may hap-
465 * pen for example because fewer bytes are actually available
466 * right now (maybe because we were close to end-of-file, or
467 * because we are reading from a pipe, or from a terminal,
468 * or because read() was interrupted by a signal). On error,
469 * -1 is returned, and errno is set appropriately. In this
470 * case it is left unspecified whether the file position (if
473 *********************************************************************/
474 int read_socket(jb_socket fd, char *buf, int len)
482 return(recv(fd, buf, len, 0));
483 #elif defined(__BEOS__) || defined(AMIGA) || defined(__OS2__)
484 return(recv(fd, buf, (size_t)len, 0));
486 return(read(fd, buf, (size_t)len));
491 /*********************************************************************
493 * Function : close_socket
495 * Description : Closes a TCP/IP socket
498 * 1 : fd = file descriptor of socket to be closed
502 *********************************************************************/
503 void close_socket(jb_socket fd)
505 #if defined(_WIN32) || defined(__BEOS__)
509 #elif defined(__OS2__)
518 /*********************************************************************
520 * Function : bind_port
522 * Description : Call socket, set socket options, and listen.
523 * Called by listen_loop to "boot up" our proxy address.
526 * 1 : hostnam = TCP/IP address to bind/listen to
527 * 2 : portnum = port to listen on
528 * 3 : pfd = pointer used to return file descriptor.
530 * Returns : if success, returns 0 and sets *pfd.
531 * if failure, returns -3 if address is in use,
532 * -2 if address unresolvable,
534 *********************************************************************/
535 int bind_port(const char *hostnam, int portnum, jb_socket *pfd)
537 struct sockaddr_in inaddr;
541 #endif /* ndef _WIN32 */
543 *pfd = JB_INVALID_SOCKET;
545 memset((char *)&inaddr, '\0', sizeof inaddr);
547 inaddr.sin_family = AF_INET;
548 inaddr.sin_addr.s_addr = resolve_hostname_to_ip(hostnam);
550 if (inaddr.sin_addr.s_addr == INADDR_NONE)
556 if (sizeof(inaddr.sin_port) == sizeof(short))
557 #endif /* ndef _WIN32 */
559 inaddr.sin_port = htons((unsigned short) portnum);
564 inaddr.sin_port = htonl((unsigned long) portnum);
566 #endif /* ndef _WIN32 */
568 fd = socket(AF_INET, SOCK_STREAM, 0);
571 if (fd == JB_INVALID_SOCKET)
581 * This is not needed for Win32 - in fact, it stops
582 * duplicate instances of Junkbuster from being caught.
584 * On UNIX, we assume the user is sensible enough not
585 * to start Junkbuster multiple times on the same IP.
586 * Without this, stopping and restarting Junkbuster
587 * from a script fails.
588 * Note: SO_REUSEADDR is meant to only take over
589 * sockets which are *not* in listen state in Linux,
590 * e.g. sockets in TIME_WAIT. YMMV.
592 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
593 #endif /* ndef _WIN32 */
595 if (bind (fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
599 if (errno == WSAEADDRINUSE)
601 if (errno == EADDRINUSE)
612 while (listen(fd, 5) == -1)
626 /*********************************************************************
628 * Function : accept_connection
630 * Description : Accepts a connection on a socket. Socket must have
631 * been created using bind_port().
634 * 1 : csp = Client state, cfd, ip_addr_str, and
635 * ip_addr_long will be set by this routine.
636 * 2 : fd = file descriptor returned from bind_port
638 * Returns : when a connection is accepted, it returns 1 (TRUE).
639 * On an error it returns 0 (FALSE).
641 *********************************************************************/
642 int accept_connection(struct client_state * csp, jb_socket fd)
644 struct sockaddr_in client, server;
645 struct hostent *host = NULL;
647 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
648 /* Wierdness - fix a warning. */
649 int c_length, s_length;
651 socklen_t c_length, s_length;
653 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS) || defined(HAVE_GETHOSTBYADDR_R_7_ARGS) || defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
654 struct hostent result;
655 #if defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
656 struct hostent_data hdata;
658 char hbuf[HOSTENT_BUFFER_SIZE];
660 #endif /* def HAVE_GETHOSTBYADDR_R_5_ARGS */
661 #endif /* def HAVE_GETHOSTBYADDR_R_(8|7|5)_ARGS */
663 c_length = s_length = sizeof(client);
666 afd = accept (fd, (struct sockaddr *) &client, &c_length);
667 if (afd == JB_INVALID_SOCKET)
674 afd = accept (fd, (struct sockaddr *) &client, &c_length);
675 } while (afd < 1 && errno == EINTR);
683 * Determine the IP-Adress that the client used to reach us
684 * and the hostname associated with that address
686 if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
688 csp->my_ip_addr_str = strdup(inet_ntoa(server.sin_addr));
689 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS)
690 gethostbyaddr_r((const char *)&server.sin_addr,
691 sizeof(server.sin_addr), AF_INET,
692 &result, hbuf, HOSTENT_BUFFER_SIZE,
694 #elif defined(HAVE_GETHOSTBYADDR_R_7_ARGS)
695 host = gethostbyaddr_r((const char *)&server.sin_addr,
696 sizeof(server.sin_addr), AF_INET,
697 &result, hbuf, HOSTENT_BUFFER_SIZE, &thd_err);
698 #elif defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
699 if (0 == gethostbyaddr_r((const char *)&server.sin_addr,
700 sizeof(server.sin_addr), AF_INET,
710 host = gethostbyaddr((const char *)&server.sin_addr,
711 sizeof(server.sin_addr), AF_INET);
715 log_error(LOG_LEVEL_ERROR, "Unable to get my own hostname: %E\n");
719 csp->my_hostname = strdup(host->h_name);
724 csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
725 csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
732 /*********************************************************************
734 * Function : resolve_hostname_to_ip
736 * Description : Resolve a hostname to an internet tcp/ip address.
737 * NULL or an empty string resolve to INADDR_ANY.
740 * 1 : host = hostname to resolve
742 * Returns : INADDR_NONE => failure, INADDR_ANY or tcp/ip address if succesful.
744 *********************************************************************/
745 unsigned long resolve_hostname_to_ip(const char *host)
747 struct sockaddr_in inaddr;
748 struct hostent *hostp;
749 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS) || defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
750 struct hostent result;
751 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
752 char hbuf[HOSTENT_BUFFER_SIZE];
754 #else /* defined(HAVE_GETHOSTBYNAME_R_3_ARGS) */
755 struct hostent_data hdata;
756 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5)_ARGS */
757 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
759 if ((host == NULL) || (*host == '\0'))
764 memset((char *) &inaddr, 0, sizeof inaddr);
766 if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
768 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS)
769 gethostbyname_r(host, &result, hbuf,
770 HOSTENT_BUFFER_SIZE, &hostp, &thd_err);
771 #elif defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
772 hostp = gethostbyname_r(host, &result, hbuf,
773 HOSTENT_BUFFER_SIZE, &thd_err);
774 #elif defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
775 if (0 == gethostbyname_r(host, &result, &hdata))
784 hostp = gethostbyname(host);
785 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
789 log_error(LOG_LEVEL_ERROR, "could not resolve hostname %s", host);
792 if (hostp->h_addrtype != AF_INET)
795 errno = WSAEPROTOTYPE;
799 log_error(LOG_LEVEL_ERROR, "hostname %s resolves to unknown address type.", host);
803 (char *) &inaddr.sin_addr,
804 (char *) hostp->h_addr,
805 sizeof(inaddr.sin_addr)
808 return(inaddr.sin_addr.s_addr);