1 const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.52 2009/04/17 11:34:34 fabiankeil 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) 2001-2007 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 1.52 2009/04/17 11:34:34 fabiankeil
39 * Style cosmetics for the IPv6 code.
41 * Revision 1.51 2009/04/17 11:27:49 fabiankeil
42 * Petr Pisar's privoxy-3.0.12-ipv6-3.diff.
44 * Revision 1.50 2008/12/20 14:53:55 fabiankeil
45 * Add config option socket-timeout to control the time
46 * Privoxy waits for data to arrive on a socket. Useful
47 * in case of stale ssh tunnels or when fuzz-testing.
49 * Revision 1.49 2008/11/10 17:03:57 fabiankeil
50 * Fix a gcc44 warning and remove a now-obsolete cast.
52 * Revision 1.48 2008/09/04 08:13:58 fabiankeil
53 * Prepare for critical sections on Windows by adding a
54 * layer of indirection before the pthread mutex functions.
56 * Revision 1.47 2008/03/26 18:07:07 fabiankeil
57 * Add hostname directive. Closes PR#1918189.
59 * Revision 1.46 2008/03/21 11:13:57 fabiankeil
60 * Only gather host information if it's actually needed.
61 * Also move the code out of accept_connection() so it's less likely
62 * to delay other incoming connections if the host is misconfigured.
64 * Revision 1.45 2007/09/30 16:59:22 fabiankeil
65 * Set the maximum listen() backlog to 128. Apparently SOMAXCONN is
66 * neither high enough, nor a hard limit on mingw32. Again for BR#1795281.
68 * Revision 1.44 2007/09/15 13:01:31 fabiankeil
69 * Increase listen() backlog to SOMAXCONN (or 128) to decrease
70 * chances of dropped connections under load. Problem reported
71 * and fix suggested by nobody in BR#1795281.
73 * Revision 1.43 2007/06/01 18:16:36 fabiankeil
74 * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
75 * deadlocks and crashes on OpenBSD and possibly other OS with neither
76 * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
77 * Thanks to Ralf Horstmann for report and solution.
79 * Revision 1.42 2007/04/01 17:37:07 fabiankeil
80 * - Add DNS retries for Solaris and other systems
81 * whose gethostbyname_r version takes five arguments.
82 * - Move maximum number of DNS retries into a macro.
84 * Revision 1.41 2006/11/13 19:05:51 fabiankeil
85 * Make pthread mutex locking more generic. Instead of
86 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
87 * and use mutex locking unless there is an _r function
88 * available. Better safe than sorry.
90 * Fixes "./configure --disable-pthread" and should result
91 * in less threading-related problems on pthread-using platforms,
92 * but it still doesn't fix BR#1122404.
94 * Revision 1.40 2006/09/02 15:36:42 fabiankeil
95 * Follow the OpenBSD port's lead and protect the resolve
96 * functions on OpenBSD as well.
98 * Revision 1.39 2006/08/03 02:46:41 david__schmidt
99 * Incorporate Fabian Keil's patch work:
\rhttp://www.fabiankeil.de/sourcecode/privoxy/
101 * Revision 1.38 2006/07/18 14:48:46 david__schmidt
102 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
103 * with what was really the latest development (the v_3_0_branch branch)
105 * Revision 1.35.2.8 2006/01/21 16:16:08 david__schmidt
106 * Thanks to Edward Carrel for his patch to modernize OSX's
\rpthreads support. See bug #1409623.
108 * Revision 1.35.2.7 2005/05/07 21:50:55 david__schmidt
109 * A few memory leaks plugged (mostly on error paths)
111 * Revision 1.35.2.6 2003/12/17 16:34:40 oes
114 * Revision 1.35.2.5 2003/04/29 11:32:54 oes
115 * Don't rely on h_addr being non-NULL after gethostbyname.
116 * Works around an oddness in Max OSX and closes bug #724796
118 * Revision 1.35.2.4 2003/04/04 12:40:20 oes
119 * Made sure the errno set by bind, not close[socket] is used in
120 * bind_port. Probably fixes bugs #713777, #705562.
122 * Revision 1.35.2.3 2003/03/07 03:41:04 david__schmidt
123 * 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.
125 * Revision 1.35.2.2 2002/11/20 14:37:24 oes
126 * Fixed Win32 error logging in bind_port.
127 * Thanks to Oliver Stoeneberg for the hint.
129 * Revision 1.35.2.1 2002/05/26 23:41:27 joergs
130 * AmigaOS: Fixed wrong type of len in write_socket()
132 * Revision 1.35 2002/04/26 15:50:04 joergs
133 * AmigaOS: No socklen_t, added AMIGA to the systems using int instead.
135 * Revision 1.34 2002/04/08 20:31:41 swa
138 * Revision 1.33 2002/04/03 16:02:18 gliptak
139 * Correcting compile warning with older gcc
141 * Revision 1.32 2002/03/31 17:18:59 jongfoster
142 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
144 * Revision 1.31 2002/03/29 03:33:13 david__schmidt
145 * Fix Mac OSX compiler warnings
147 * Revision 1.30 2002/03/27 14:32:43 david__schmidt
148 * More compiler warning message maintenance
150 * Revision 1.29 2002/03/26 22:29:54 swa
151 * we have a new homepage!
153 * Revision 1.28 2002/03/24 13:25:43 swa
154 * name change related issues
156 * Revision 1.27 2002/03/13 00:27:05 jongfoster
159 * Revision 1.26 2002/03/11 22:07:02 david__schmidt
160 * OS/2 port maintenance:
161 * - Fixed EMX build - it had decayed a little
162 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
163 * substituted a memset for now.
165 * Revision 1.25 2002/03/09 20:03:52 jongfoster
166 * - Making various functions return int rather than size_t.
167 * (Undoing a recent change). Since size_t is unsigned on
168 * Windows, functions like read_socket that return -1 on
169 * error cannot return a size_t.
171 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
172 * crashes, and also frequently caused JB to jump to 100%
173 * CPU and stay there. (Because it thought it had just
174 * read ((unsigned)-1) == 4Gb of data...)
176 * - The signature of write_socket has changed, it now simply
177 * returns success=0/failure=nonzero.
179 * - Trying to get rid of a few warnings --with-debug on
180 * Windows, I've introduced a new type "jb_socket". This is
181 * used for the socket file descriptors. On Windows, this
182 * is SOCKET (a typedef for unsigned). Everywhere else, it's
183 * an int. The error value can't be -1 any more, so it's
184 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
185 * Windows it maps to the #define INVALID_SOCKET.)
187 * - The signature of bind_port has changed.
189 * Revision 1.24 2002/03/07 03:51:36 oes
190 * - Improved handling of failed DNS lookups
191 * - Fixed compiler warnings etc
193 * Revision 1.23 2002/03/05 00:36:01 jongfoster
194 * Fixing bug 514988 - unable to restart Junkbuster
196 * Revision 1.22 2002/03/04 02:08:02 david__schmidt
197 * Enable web editing of actions file on OS/2 (it had been broken all this time!)
199 * Revision 1.21 2002/01/09 14:32:33 oes
200 * Added support for gethostbyname_r and gethostbyaddr_r.
202 * Revision 1.20 2001/11/16 00:48:48 jongfoster
203 * Enabling duplicate-socket detection for all platforms, not
206 * Revision 1.19 2001/10/25 03:40:47 david__schmidt
207 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
208 * threads to call select() simultaneously. So, it's time to do a real, live,
209 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
210 * (native). Both versions will work, but using __OS2__ offers multi-threading.
212 * Revision 1.18 2001/09/21 23:02:02 david__schmidt
213 * Cleaning up 2 compiler warnings on OS/2.
215 * Revision 1.17 2001/09/13 20:11:46 jongfoster
216 * Fixing 2 compiler warnings under Win32
218 * Revision 1.16 2001/07/30 22:08:36 jongfoster
219 * Tidying up #defines:
220 * - All feature #defines are now of the form FEATURE_xxx
221 * - Permanently turned off WIN_GUI_EDIT
222 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
224 * Revision 1.15 2001/07/29 17:40:43 jongfoster
225 * Fixed compiler warning by adding a cast
227 * Revision 1.14 2001/07/18 13:47:59 oes
228 * Eliminated dirty hack for getsockbyname()
230 * Revision 1.13 2001/07/15 13:56:57 jongfoster
231 * Removing unused local variable.
233 * Revision 1.12 2001/07/01 17:04:11 oes
234 * Bugfix: accept_connection no longer uses the obsolete hstrerror() function
236 * Revision 1.11 2001/06/29 21:45:41 oes
237 * Indentation, CRLF->LF, Tab-> Space
239 * Revision 1.10 2001/06/29 13:29:15 oes
240 * - Added remote (server) host IP to csp->http->host_ip_addr_str
241 * - Added detection of local socket IP and fqdn
242 * - Removed logentry from cancelled commit
244 * Revision 1.9 2001/06/07 23:06:09 jongfoster
245 * The host parameter to connect_to() is now const.
247 * Revision 1.8 2001/06/03 19:12:07 oes
250 * Revision 1.7 2001/05/28 16:14:00 jongfoster
251 * Fixing bug in LOG_LEVEL_LOG
253 * Revision 1.6 2001/05/26 17:28:32 jongfoster
254 * Fixed LOG_LEVEL_LOG
256 * Revision 1.5 2001/05/26 15:26:15 jongfoster
257 * ACL feature now provides more security by immediately dropping
258 * connections from untrusted hosts.
260 * Revision 1.4 2001/05/26 00:37:42 jongfoster
261 * Cosmetic indentation correction.
263 * Revision 1.3 2001/05/25 21:57:54 jongfoster
264 * Now gives a warning under Windows if you try to bind
265 * it to a port that's already in use.
267 * Revision 1.2 2001/05/17 23:01:01 oes
268 * - Cleaned CRLF's from the sources and related files
270 * Revision 1.1.1.1 2001/05/15 13:58:54 oes
271 * Initial import of version 2.9.3 source tree
274 *********************************************************************/
284 #include <sys/types.h>
292 #include <sys/timeb.h>
300 #include <sys/time.h>
301 #include <netinet/in.h>
302 #include <sys/ioctl.h>
304 #include <sys/socket.h>
307 #include <netinet/tcp.h>
309 #include <arpa/inet.h>
315 #if defined(__EMX__) || defined (__OS2__)
316 #include <sys/select.h> /* OS/2/EMX needs a little help with select */
326 #ifdef FEATURE_PTHREAD
328 /* jcc.h is for mutex semaphores only */
329 #endif /* def FEATURE_PTHREAD */
331 #include "jbsockets.h"
334 #include "miscutil.h"
336 const char jbsockets_h_rcs[] = JBSOCKETS_H_VERSION;
339 * Maximum number of gethostbyname(_r) retries in case of
340 * soft errors (TRY_AGAIN).
341 * XXX: Does it make sense to make this a config option?
343 #define MAX_DNS_RETRIES 10
345 #define MAX_LISTEN_BACKLOG 128
348 /*********************************************************************
350 * Function : connect_to
352 * Description : Open a socket and connect to it. Will check
353 * that this is allowed according to ACL.
356 * 1 : host = hostname to connect to
357 * 2 : portnum = port to connent on (XXX: should be unsigned)
358 * 3 : csp = Current client state (buffers, headers, etc...)
359 * Not modified, only used for source IP and ACL.
361 * Returns : JB_INVALID_SOCKET => failure, else it is the socket
364 *********************************************************************/
365 #ifdef HAVE_GETADDRINFO
366 /* Getaddrinfo implementation */
367 jb_socket connect_to(const char *host, int portnum, struct client_state *csp)
369 struct addrinfo hints, *result, *rp;
374 struct timeval tv[1];
375 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
377 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
381 struct access_control_addr dst[1];
382 #endif /* def FEATURE_ACL */
384 retval = snprintf(service, sizeof(service), "%d", portnum);
385 if ((-1 == retval) || (sizeof(service) <= retval))
387 log_error(LOG_LEVEL_ERROR,
388 "Port number (%d) ASCII decimal representation doesn't fit into 6 bytes",
390 csp->http->host_ip_addr_str = strdup("unknown");
391 return(JB_INVALID_SOCKET);
394 memset((char *)&hints, 0, sizeof(hints));
395 hints.ai_family = AF_UNSPEC;
396 hints.ai_socktype = SOCK_STREAM;
397 hints.ai_flags = AI_ADDRCONFIG | AI_NUMERICSERV; /* avoid service look-up */
398 if ((retval = getaddrinfo(host, service, &hints, &result)))
400 log_error(LOG_LEVEL_INFO,
401 "Can not resolve %s: %s", host, gai_strerror(retval));
402 csp->http->host_ip_addr_str = strdup("unknown");
403 return(JB_INVALID_SOCKET);
406 for (rp = result; rp != NULL; rp = rp->ai_next)
410 memcpy(&dst->addr, rp->ai_addr, rp->ai_addrlen);
412 if (block_acl(dst, csp))
421 #endif /* def FEATURE_ACL */
423 csp->http->host_ip_addr_str = malloc(NI_MAXHOST);
424 retval = getnameinfo(rp->ai_addr, rp->ai_addrlen,
425 csp->http->host_ip_addr_str, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
426 if (!csp->http->host_ip_addr_str || retval)
428 log_error(LOG_LEVEL_ERROR,
429 "Can not save csp->http->host_ip_addr_str: %s",
430 (csp->http->host_ip_addr_str) ?
431 gai_strerror(retval) : "Insufficient memory");
432 freez(csp->http->host_ip_addr_str);
437 if ((fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol)) ==
440 if ((fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol)) < 0)
447 { /* turn off TCP coalescence */
449 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
451 #endif /* def TCP_NODELAY */
453 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
454 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
457 fcntl(fd, F_SETFL, flags);
459 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
462 while (connect(fd, rp->ai_addr, rp->ai_addrlen) == JB_INVALID_SOCKET)
465 if (errno == WSAEINPROGRESS)
467 if (sock_errno() == EINPROGRESS)
468 #else /* ifndef _WIN32 */
469 if (errno == EINPROGRESS)
470 #endif /* ndef _WIN32 || __OS2__ */
476 if (sock_errno() != EINTR)
491 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
495 fcntl(fd, F_SETFL, flags);
497 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
499 /* wait for connection to complete */
506 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
507 if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
513 break; /* for; Connection established; don't try other addresses */
516 freeaddrinfo(result);
519 log_error(LOG_LEVEL_INFO,
520 "Could not connect to TCP/[%s]:%s", host, service);
521 return(JB_INVALID_SOCKET);
524 * XXX: Current connection verification (EINPROGRESS && select()
525 * for writing) is not sufficient. E.g. on Linux-2.6.27 with glibc-2.6
526 * select returns socket ready for writing, however subsequential
527 * write(2) fails with ENOCONNECT. Read Linux connect(2) man page
528 * about non-blocking sockets.
529 * Thus we can't log here that the socket is connected.
531 /* log_error(LOG_LEVEL_INFO, "Connected to TCP/[%s]:%s", host, service); */
537 # else /* ndef HAVE_GETADDRINFO */
538 /* Pre-getaddrinfo implementation */
540 jb_socket connect_to(const char *host, int portnum, struct client_state *csp)
542 struct sockaddr_in inaddr;
546 struct timeval tv[1];
547 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
549 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
552 struct access_control_addr dst[1];
553 #endif /* def FEATURE_ACL */
555 memset((char *)&inaddr, 0, sizeof inaddr);
557 if ((addr = resolve_hostname_to_ip(host)) == INADDR_NONE)
559 csp->http->host_ip_addr_str = strdup("unknown");
560 return(JB_INVALID_SOCKET);
564 dst->addr = ntohl(addr);
567 if (block_acl(dst, csp))
574 return(JB_INVALID_SOCKET);
576 #endif /* def FEATURE_ACL */
578 inaddr.sin_addr.s_addr = addr;
579 inaddr.sin_family = AF_INET;
580 csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
583 if (sizeof(inaddr.sin_port) == sizeof(short))
584 #endif /* ndef _WIN32 */
586 inaddr.sin_port = htons((unsigned short) portnum);
591 inaddr.sin_port = htonl((unsigned long)portnum);
593 #endif /* ndef _WIN32 */
596 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) == JB_INVALID_SOCKET)
598 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) < 0)
601 return(JB_INVALID_SOCKET);
605 { /* turn off TCP coalescence */
607 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
609 #endif /* def TCP_NODELAY */
611 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
612 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
615 fcntl(fd, F_SETFL, flags);
617 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
619 while (connect(fd, (struct sockaddr *) & inaddr, sizeof inaddr) == JB_INVALID_SOCKET)
622 if (errno == WSAEINPROGRESS)
624 if (sock_errno() == EINPROGRESS)
625 #else /* ifndef _WIN32 */
626 if (errno == EINPROGRESS)
627 #endif /* ndef _WIN32 || __OS2__ */
633 if (sock_errno() != EINTR)
639 return(JB_INVALID_SOCKET);
643 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
647 fcntl(fd, F_SETFL, flags);
649 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
651 /* wait for connection to complete */
658 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
659 if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
662 return(JB_INVALID_SOCKET);
667 #endif /* ndef HAVE_GETADDRINFO */
670 /*********************************************************************
672 * Function : write_socket
674 * Description : Write the contents of buf (for n bytes) to socket fd.
677 * 1 : fd = file descriptor (aka. handle) of socket to write to.
678 * 2 : buf = pointer to data to be written.
679 * 3 : len = length of data to be written to the socket "fd".
681 * Returns : 0 on success (entire buffer sent).
684 *********************************************************************/
686 int write_socket(jb_socket fd, const char *buf, ssize_t len)
688 int write_socket(jb_socket fd, const char *buf, size_t len)
696 if (len < 0) /* constant condition - size_t isn't ever negative */
701 log_error(LOG_LEVEL_LOG, "%N", len, buf);
704 return (send(fd, buf, (int)len, 0) != (int)len);
705 #elif defined(__BEOS__) || defined(AMIGA)
706 return (send(fd, buf, len, 0) != len);
707 #elif defined(__OS2__)
709 * Break the data up into SOCKET_SEND_MAX chunks for sending...
710 * OS/2 seemed to complain when the chunks were too large.
712 #define SOCKET_SEND_MAX 65000
714 int write_len = 0, send_len, send_rc = 0, i = 0;
715 while ((i < len) && (send_rc != -1))
717 if ((i + SOCKET_SEND_MAX) > len)
720 send_len = SOCKET_SEND_MAX;
721 send_rc = send(fd,(char*)buf + i, send_len, 0);
729 return (write(fd, buf, len) != len);
735 /*********************************************************************
737 * Function : read_socket
739 * Description : Read from a TCP/IP socket in a platform independent way.
742 * 1 : fd = file descriptor of the socket to read
743 * 2 : buf = pointer to buffer where data will be written
744 * Must be >= len bytes long.
745 * 3 : len = maximum number of bytes to read
747 * Returns : On success, the number of bytes read is returned (zero
748 * indicates end of file), and the file position is advanced
749 * by this number. It is not an error if this number is
750 * smaller than the number of bytes requested; this may hap-
751 * pen for example because fewer bytes are actually available
752 * right now (maybe because we were close to end-of-file, or
753 * because we are reading from a pipe, or from a terminal,
754 * or because read() was interrupted by a signal). On error,
755 * -1 is returned, and errno is set appropriately. In this
756 * case it is left unspecified whether the file position (if
759 *********************************************************************/
760 int read_socket(jb_socket fd, char *buf, int len)
768 return(recv(fd, buf, len, 0));
769 #elif defined(__BEOS__) || defined(AMIGA) || defined(__OS2__)
770 return(recv(fd, buf, (size_t)len, 0));
772 return(read(fd, buf, (size_t)len));
777 /*********************************************************************
779 * Function : data_is_available
781 * Description : Waits for data to arrive on a socket.
784 * 1 : fd = file descriptor of the socket to read
785 * 2 : seconds_to_wait = number of seconds after which we give up.
787 * Returns : TRUE if data arrived in time,
790 *********************************************************************/
791 int data_is_available(jb_socket fd, int seconds_to_wait)
794 struct timeval timeout;
797 memset(&timeout, 0, sizeof(timeout));
798 timeout.tv_sec = seconds_to_wait;
801 /* Copy and pasted from jcc.c ... */
802 memset(&rfds, 0, sizeof(fd_set));
808 n = select(fd+1, &rfds, NULL, NULL, &timeout);
811 * XXX: Do we care about the different error conditions?
817 /*********************************************************************
819 * Function : close_socket
821 * Description : Closes a TCP/IP socket
824 * 1 : fd = file descriptor of socket to be closed
828 *********************************************************************/
829 void close_socket(jb_socket fd)
831 #if defined(_WIN32) || defined(__BEOS__)
835 #elif defined(__OS2__)
844 /*********************************************************************
846 * Function : bind_port
848 * Description : Call socket, set socket options, and listen.
849 * Called by listen_loop to "boot up" our proxy address.
852 * 1 : hostnam = TCP/IP address to bind/listen to
853 * 2 : portnum = port to listen on
854 * 3 : pfd = pointer used to return file descriptor.
856 * Returns : if success, returns 0 and sets *pfd.
857 * if failure, returns -3 if address is in use,
858 * -2 if address unresolvable,
860 *********************************************************************/
861 int bind_port(const char *hostnam, int portnum, jb_socket *pfd)
863 #ifdef HAVE_GETADDRINFO
864 struct addrinfo hints;
865 struct addrinfo *result, *rp;
867 * XXX: portnum should be a string to allow symbolic service
868 * names in the configuration file and to avoid the following
874 struct sockaddr_in inaddr;
875 #endif /* def HAVE_GETADDRINFO */
879 #endif /* ndef _WIN32 */
881 *pfd = JB_INVALID_SOCKET;
883 #ifdef HAVE_GETADDRINFO
884 retval = snprintf(servnam, sizeof(servnam), "%d", portnum);
885 if ((-1 == retval) || (sizeof(servnam) <= retval))
887 log_error(LOG_LEVEL_ERROR,
888 "Port number (%d) ASCII decimal representation doesn't fit into 6 bytes",
893 memset(&hints, 0, sizeof(struct addrinfo));
894 if ((hostnam == NULL) || !strcmpic(hostnam, "localhost"))
897 * XXX: This is a hack. The right thing to do
898 * would be to bind to both AF_INET and AF_INET6.
899 * This will also fail if there is no AF_INET
902 hints.ai_family = AF_INET;
906 hints.ai_family = AF_UNSPEC;
908 hints.ai_socktype = SOCK_STREAM;
909 hints.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
910 hints.ai_protocol = 0; /* Realy any stream protocol or TCP only */
911 hints.ai_canonname = NULL;
912 hints.ai_addr = NULL;
913 hints.ai_next = NULL;
915 if ((retval = getaddrinfo(hostnam, servnam, &hints, &result)))
917 log_error(LOG_LEVEL_ERROR,
918 "Can not resolve %s: %s", hostnam, gai_strerror(retval));
922 memset((char *)&inaddr, '\0', sizeof inaddr);
924 inaddr.sin_family = AF_INET;
925 inaddr.sin_addr.s_addr = resolve_hostname_to_ip(hostnam);
927 if (inaddr.sin_addr.s_addr == INADDR_NONE)
933 if (sizeof(inaddr.sin_port) == sizeof(short))
934 #endif /* ndef _WIN32 */
936 inaddr.sin_port = htons((unsigned short) portnum);
941 inaddr.sin_port = htonl((unsigned long) portnum);
943 #endif /* ndef _WIN32 */
944 #endif /* def HAVE_GETADDRINFO */
946 #ifdef HAVE_GETADDRINFO
947 for (rp = result; rp != NULL; rp = rp->ai_next)
949 fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
951 fd = socket(AF_INET, SOCK_STREAM, 0);
952 #endif /* def HAVE_GETADDRINFO */
955 if (fd == JB_INVALID_SOCKET)
960 #ifdef HAVE_GETADDRINFO
969 * This is not needed for Win32 - in fact, it stops
970 * duplicate instances of Privoxy from being caught.
972 * On UNIX, we assume the user is sensible enough not
973 * to start Privoxy multiple times on the same IP.
974 * Without this, stopping and restarting Privoxy
975 * from a script fails.
976 * Note: SO_REUSEADDR is meant to only take over
977 * sockets which are *not* in listen state in Linux,
978 * e.g. sockets in TIME_WAIT. YMMV.
980 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
981 #endif /* ndef _WIN32 */
983 #ifdef HAVE_GETADDRINFO
984 if (bind(fd, rp->ai_addr, rp->ai_addrlen) < 0)
986 if (bind(fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
990 errno = WSAGetLastError();
991 if (errno == WSAEADDRINUSE)
993 if (errno == EADDRINUSE)
996 #ifdef HAVE_GETADDRINFO
997 freeaddrinfo(result);
1005 #ifndef HAVE_GETADDRINFO
1014 /* bind() succeeded, escape from for-loop */
1016 * XXX: Support multiple listening sockets (e.g. localhost
1017 * resolves to AF_INET and AF_INET6, but only the first address
1024 freeaddrinfo(result);
1027 /* All bind()s failed */
1030 #endif /* ndef HAVE_GETADDRINFO */
1032 while (listen(fd, MAX_LISTEN_BACKLOG) == -1)
1046 /*********************************************************************
1048 * Function : get_host_information
1050 * Description : Determines the IP address the client used to
1051 * reach us and the hostname associated with it.
1053 * XXX: Most of the code has been copy and pasted
1054 * from accept_connection() and not all of the
1055 * ifdefs paths have been tested afterwards.
1058 * 1 : afd = File descriptor returned from accept().
1059 * 2 : ip_address = Pointer to return the pointer to
1060 * the ip address string.
1061 * 3 : hostname = Pointer to return the pointer to
1062 * the hostname or NULL if the caller
1063 * isn't interested in it.
1067 *********************************************************************/
1068 void get_host_information(jb_socket afd, char **ip_address, char **hostname)
1070 #ifdef HAVE_GETNAMEINFO
1071 struct sockaddr_storage server;
1074 struct sockaddr_in server;
1075 struct hostent *host = NULL;
1076 #endif /* HAVE_GETNAMEINFO */
1077 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
1078 /* according to accept_connection() this fixes a warning. */
1079 int s_length, s_length_provided;
1081 socklen_t s_length, s_length_provided;
1083 #ifndef HAVE_GETNAMEINFO
1084 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS) || defined(HAVE_GETHOSTBYADDR_R_7_ARGS) || defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
1085 struct hostent result;
1086 #if defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
1087 struct hostent_data hdata;
1089 char hbuf[HOSTENT_BUFFER_SIZE];
1091 #endif /* def HAVE_GETHOSTBYADDR_R_5_ARGS */
1092 #endif /* def HAVE_GETHOSTBYADDR_R_(8|7|5)_ARGS */
1093 #endif /* ifndef HAVE_GETNAMEINFO */
1094 s_length = s_length_provided = sizeof(server);
1096 if (NULL != hostname)
1102 if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
1104 if (s_length > s_length_provided)
1106 log_error(LOG_LEVEL_ERROR, "getsockname() truncated server address");
1109 #ifdef HAVE_GETNAMEINFO
1110 *ip_address = malloc(NI_MAXHOST);
1111 retval = getnameinfo((struct sockaddr *) &server, s_length,
1112 *ip_address, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
1115 log_error(LOG_LEVEL_ERROR,
1116 "Unable to print my own IP address: %s", gai_strerror(retval));
1121 *ip_address = strdup(inet_ntoa(server.sin_addr));
1122 #endif /* HAVE_GETNAMEINFO */
1123 if (NULL == hostname)
1126 * We're done here, the caller isn't
1127 * interested in knowing the hostname.
1132 #ifdef HAVE_GETNAMEINFO
1133 *hostname = malloc(NI_MAXHOST);
1134 retval = getnameinfo((struct sockaddr *) &server, s_length,
1135 *hostname, NI_MAXHOST, NULL, 0, NI_NAMEREQD);
1138 log_error(LOG_LEVEL_ERROR,
1139 "Unable to resolve my own IP address: %s", gai_strerror(retval));
1143 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS)
1144 gethostbyaddr_r((const char *)&server.sin_addr,
1145 sizeof(server.sin_addr), AF_INET,
1146 &result, hbuf, HOSTENT_BUFFER_SIZE,
1148 #elif defined(HAVE_GETHOSTBYADDR_R_7_ARGS)
1149 host = gethostbyaddr_r((const char *)&server.sin_addr,
1150 sizeof(server.sin_addr), AF_INET,
1151 &result, hbuf, HOSTENT_BUFFER_SIZE, &thd_err);
1152 #elif defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
1153 if (0 == gethostbyaddr_r((const char *)&server.sin_addr,
1154 sizeof(server.sin_addr), AF_INET,
1163 #elif FEATURE_PTHREAD
1164 privoxy_mutex_lock(&resolver_mutex);
1165 host = gethostbyaddr((const char *)&server.sin_addr,
1166 sizeof(server.sin_addr), AF_INET);
1167 privoxy_mutex_unlock(&resolver_mutex);
1169 host = gethostbyaddr((const char *)&server.sin_addr,
1170 sizeof(server.sin_addr), AF_INET);
1174 log_error(LOG_LEVEL_ERROR, "Unable to get my own hostname: %E\n");
1178 *hostname = strdup(host->h_name);
1180 #endif /* else def HAVE_GETNAMEINFO */
1187 /*********************************************************************
1189 * Function : accept_connection
1191 * Description : Accepts a connection on a socket. Socket must have
1192 * been created using bind_port().
1195 * 1 : csp = Client state, cfd, ip_addr_str, and
1196 * ip_addr_long will be set by this routine.
1197 * 2 : fd = file descriptor returned from bind_port
1199 * Returns : when a connection is accepted, it returns 1 (TRUE).
1200 * On an error it returns 0 (FALSE).
1202 *********************************************************************/
1203 int accept_connection(struct client_state * csp, jb_socket fd)
1205 #ifdef HAVE_GETNAMEINFO
1206 /* XXX: client is stored directly into csp->tcp_addr */
1207 #define client (csp->tcp_addr)
1210 struct sockaddr_in client;
1213 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
1214 /* Wierdness - fix a warning. */
1220 c_length = sizeof(client);
1223 afd = accept (fd, (struct sockaddr *) &client, &c_length);
1224 if (afd == JB_INVALID_SOCKET)
1231 afd = accept (fd, (struct sockaddr *) &client, &c_length);
1232 } while (afd < 1 && errno == EINTR);
1240 #ifdef HAVE_GETNAMEINFO
1241 csp->ip_addr_str = malloc(NI_MAXHOST);
1242 retval = getnameinfo((struct sockaddr *) &client, c_length,
1243 csp->ip_addr_str, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
1244 if (!csp->ip_addr_str || retval)
1246 log_error(LOG_LEVEL_ERROR, "Can not save csp->ip_addr_str: %s",
1247 (csp->ip_addr_str) ? gai_strerror(retval) : "Insuffcient memory");
1248 freez(csp->ip_addr_str);
1252 csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
1253 csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
1254 #endif /* def HAVE_GETNAMEINFO */
1261 /*********************************************************************
1263 * Function : resolve_hostname_to_ip
1265 * Description : Resolve a hostname to an internet tcp/ip address.
1266 * NULL or an empty string resolve to INADDR_ANY.
1269 * 1 : host = hostname to resolve
1271 * Returns : INADDR_NONE => failure, INADDR_ANY or tcp/ip address if succesful.
1273 *********************************************************************/
1274 unsigned long resolve_hostname_to_ip(const char *host)
1276 struct sockaddr_in inaddr;
1277 struct hostent *hostp;
1278 unsigned int dns_retries = 0;
1279 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS) || defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
1280 struct hostent result;
1281 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
1282 char hbuf[HOSTENT_BUFFER_SIZE];
1284 #else /* defined(HAVE_GETHOSTBYNAME_R_3_ARGS) */
1285 struct hostent_data hdata;
1286 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5)_ARGS */
1287 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
1289 if ((host == NULL) || (*host == '\0'))
1294 memset((char *) &inaddr, 0, sizeof inaddr);
1296 if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
1298 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS)
1299 while (gethostbyname_r(host, &result, hbuf,
1300 HOSTENT_BUFFER_SIZE, &hostp, &thd_err)
1301 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1303 log_error(LOG_LEVEL_ERROR,
1304 "Timeout #%u while trying to resolve %s. Trying again.",
1307 #elif defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
1308 while (NULL == (hostp = gethostbyname_r(host, &result,
1309 hbuf, HOSTENT_BUFFER_SIZE, &thd_err))
1310 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1312 log_error(LOG_LEVEL_ERROR,
1313 "Timeout #%u while trying to resolve %s. Trying again.",
1316 #elif defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
1318 * XXX: Doesn't retry in case of soft errors.
1319 * Does this gethostbyname_r version set h_errno?
1321 if (0 == gethostbyname_r(host, &result, &hdata))
1329 #elif FEATURE_PTHREAD
1330 privoxy_mutex_lock(&resolver_mutex);
1331 while (NULL == (hostp = gethostbyname(host))
1332 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1334 log_error(LOG_LEVEL_ERROR,
1335 "Timeout #%u while trying to resolve %s. Trying again.",
1338 privoxy_mutex_unlock(&resolver_mutex);
1340 while (NULL == (hostp = gethostbyname(host))
1341 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1343 log_error(LOG_LEVEL_ERROR,
1344 "Timeout #%u while trying to resolve %s. Trying again.",
1347 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
1349 * On Mac OSX, if a domain exists but doesn't have a type A
1350 * record associated with it, the h_addr member of the struct
1351 * hostent returned by gethostbyname is NULL, even if h_length
1352 * is 4. Therefore the second test below.
1354 if (hostp == NULL || hostp->h_addr == NULL)
1357 log_error(LOG_LEVEL_ERROR, "could not resolve hostname %s", host);
1358 return(INADDR_NONE);
1360 if (hostp->h_addrtype != AF_INET)
1363 errno = WSAEPROTOTYPE;
1367 log_error(LOG_LEVEL_ERROR, "hostname %s resolves to unknown address type.", host);
1368 return(INADDR_NONE);
1371 (char *) &inaddr.sin_addr,
1372 (char *) hostp->h_addr,
1373 sizeof(inaddr.sin_addr)
1376 return(inaddr.sin_addr.s_addr);