1 const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.53 2009/04/17 11:39:52 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 1.53 2009/04/17 11:39:52 fabiankeil
39 * If the hostname is 'localhost' or not specified, request an AF_INET address.
41 * Revision 1.52 2009/04/17 11:34:34 fabiankeil
42 * Style cosmetics for the IPv6 code.
44 * Revision 1.51 2009/04/17 11:27:49 fabiankeil
45 * Petr Pisar's privoxy-3.0.12-ipv6-3.diff.
47 * Revision 1.50 2008/12/20 14:53:55 fabiankeil
48 * Add config option socket-timeout to control the time
49 * Privoxy waits for data to arrive on a socket. Useful
50 * in case of stale ssh tunnels or when fuzz-testing.
52 * Revision 1.49 2008/11/10 17:03:57 fabiankeil
53 * Fix a gcc44 warning and remove a now-obsolete cast.
55 * Revision 1.48 2008/09/04 08:13:58 fabiankeil
56 * Prepare for critical sections on Windows by adding a
57 * layer of indirection before the pthread mutex functions.
59 * Revision 1.47 2008/03/26 18:07:07 fabiankeil
60 * Add hostname directive. Closes PR#1918189.
62 * Revision 1.46 2008/03/21 11:13:57 fabiankeil
63 * Only gather host information if it's actually needed.
64 * Also move the code out of accept_connection() so it's less likely
65 * to delay other incoming connections if the host is misconfigured.
67 * Revision 1.45 2007/09/30 16:59:22 fabiankeil
68 * Set the maximum listen() backlog to 128. Apparently SOMAXCONN is
69 * neither high enough, nor a hard limit on mingw32. Again for BR#1795281.
71 * Revision 1.44 2007/09/15 13:01:31 fabiankeil
72 * Increase listen() backlog to SOMAXCONN (or 128) to decrease
73 * chances of dropped connections under load. Problem reported
74 * and fix suggested by nobody in BR#1795281.
76 * Revision 1.43 2007/06/01 18:16:36 fabiankeil
77 * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
78 * deadlocks and crashes on OpenBSD and possibly other OS with neither
79 * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
80 * Thanks to Ralf Horstmann for report and solution.
82 * Revision 1.42 2007/04/01 17:37:07 fabiankeil
83 * - Add DNS retries for Solaris and other systems
84 * whose gethostbyname_r version takes five arguments.
85 * - Move maximum number of DNS retries into a macro.
87 * Revision 1.41 2006/11/13 19:05:51 fabiankeil
88 * Make pthread mutex locking more generic. Instead of
89 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
90 * and use mutex locking unless there is an _r function
91 * available. Better safe than sorry.
93 * Fixes "./configure --disable-pthread" and should result
94 * in less threading-related problems on pthread-using platforms,
95 * but it still doesn't fix BR#1122404.
97 * Revision 1.40 2006/09/02 15:36:42 fabiankeil
98 * Follow the OpenBSD port's lead and protect the resolve
99 * functions on OpenBSD as well.
101 * Revision 1.39 2006/08/03 02:46:41 david__schmidt
102 * Incorporate Fabian Keil's patch work:
\rhttp://www.fabiankeil.de/sourcecode/privoxy/
104 * Revision 1.38 2006/07/18 14:48:46 david__schmidt
105 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
106 * with what was really the latest development (the v_3_0_branch branch)
108 * Revision 1.35.2.8 2006/01/21 16:16:08 david__schmidt
109 * Thanks to Edward Carrel for his patch to modernize OSX's
\rpthreads support. See bug #1409623.
111 * Revision 1.35.2.7 2005/05/07 21:50:55 david__schmidt
112 * A few memory leaks plugged (mostly on error paths)
114 * Revision 1.35.2.6 2003/12/17 16:34:40 oes
117 * Revision 1.35.2.5 2003/04/29 11:32:54 oes
118 * Don't rely on h_addr being non-NULL after gethostbyname.
119 * Works around an oddness in Max OSX and closes bug #724796
121 * Revision 1.35.2.4 2003/04/04 12:40:20 oes
122 * Made sure the errno set by bind, not close[socket] is used in
123 * bind_port. Probably fixes bugs #713777, #705562.
125 * Revision 1.35.2.3 2003/03/07 03:41:04 david__schmidt
126 * 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.
128 * Revision 1.35.2.2 2002/11/20 14:37:24 oes
129 * Fixed Win32 error logging in bind_port.
130 * Thanks to Oliver Stoeneberg for the hint.
132 * Revision 1.35.2.1 2002/05/26 23:41:27 joergs
133 * AmigaOS: Fixed wrong type of len in write_socket()
135 * Revision 1.35 2002/04/26 15:50:04 joergs
136 * AmigaOS: No socklen_t, added AMIGA to the systems using int instead.
138 * Revision 1.34 2002/04/08 20:31:41 swa
141 * Revision 1.33 2002/04/03 16:02:18 gliptak
142 * Correcting compile warning with older gcc
144 * Revision 1.32 2002/03/31 17:18:59 jongfoster
145 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
147 * Revision 1.31 2002/03/29 03:33:13 david__schmidt
148 * Fix Mac OSX compiler warnings
150 * Revision 1.30 2002/03/27 14:32:43 david__schmidt
151 * More compiler warning message maintenance
153 * Revision 1.29 2002/03/26 22:29:54 swa
154 * we have a new homepage!
156 * Revision 1.28 2002/03/24 13:25:43 swa
157 * name change related issues
159 * Revision 1.27 2002/03/13 00:27:05 jongfoster
162 * Revision 1.26 2002/03/11 22:07:02 david__schmidt
163 * OS/2 port maintenance:
164 * - Fixed EMX build - it had decayed a little
165 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
166 * substituted a memset for now.
168 * Revision 1.25 2002/03/09 20:03:52 jongfoster
169 * - Making various functions return int rather than size_t.
170 * (Undoing a recent change). Since size_t is unsigned on
171 * Windows, functions like read_socket that return -1 on
172 * error cannot return a size_t.
174 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
175 * crashes, and also frequently caused JB to jump to 100%
176 * CPU and stay there. (Because it thought it had just
177 * read ((unsigned)-1) == 4Gb of data...)
179 * - The signature of write_socket has changed, it now simply
180 * returns success=0/failure=nonzero.
182 * - Trying to get rid of a few warnings --with-debug on
183 * Windows, I've introduced a new type "jb_socket". This is
184 * used for the socket file descriptors. On Windows, this
185 * is SOCKET (a typedef for unsigned). Everywhere else, it's
186 * an int. The error value can't be -1 any more, so it's
187 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
188 * Windows it maps to the #define INVALID_SOCKET.)
190 * - The signature of bind_port has changed.
192 * Revision 1.24 2002/03/07 03:51:36 oes
193 * - Improved handling of failed DNS lookups
194 * - Fixed compiler warnings etc
196 * Revision 1.23 2002/03/05 00:36:01 jongfoster
197 * Fixing bug 514988 - unable to restart Junkbuster
199 * Revision 1.22 2002/03/04 02:08:02 david__schmidt
200 * Enable web editing of actions file on OS/2 (it had been broken all this time!)
202 * Revision 1.21 2002/01/09 14:32:33 oes
203 * Added support for gethostbyname_r and gethostbyaddr_r.
205 * Revision 1.20 2001/11/16 00:48:48 jongfoster
206 * Enabling duplicate-socket detection for all platforms, not
209 * Revision 1.19 2001/10/25 03:40:47 david__schmidt
210 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
211 * threads to call select() simultaneously. So, it's time to do a real, live,
212 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
213 * (native). Both versions will work, but using __OS2__ offers multi-threading.
215 * Revision 1.18 2001/09/21 23:02:02 david__schmidt
216 * Cleaning up 2 compiler warnings on OS/2.
218 * Revision 1.17 2001/09/13 20:11:46 jongfoster
219 * Fixing 2 compiler warnings under Win32
221 * Revision 1.16 2001/07/30 22:08:36 jongfoster
222 * Tidying up #defines:
223 * - All feature #defines are now of the form FEATURE_xxx
224 * - Permanently turned off WIN_GUI_EDIT
225 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
227 * Revision 1.15 2001/07/29 17:40:43 jongfoster
228 * Fixed compiler warning by adding a cast
230 * Revision 1.14 2001/07/18 13:47:59 oes
231 * Eliminated dirty hack for getsockbyname()
233 * Revision 1.13 2001/07/15 13:56:57 jongfoster
234 * Removing unused local variable.
236 * Revision 1.12 2001/07/01 17:04:11 oes
237 * Bugfix: accept_connection no longer uses the obsolete hstrerror() function
239 * Revision 1.11 2001/06/29 21:45:41 oes
240 * Indentation, CRLF->LF, Tab-> Space
242 * Revision 1.10 2001/06/29 13:29:15 oes
243 * - Added remote (server) host IP to csp->http->host_ip_addr_str
244 * - Added detection of local socket IP and fqdn
245 * - Removed logentry from cancelled commit
247 * Revision 1.9 2001/06/07 23:06:09 jongfoster
248 * The host parameter to connect_to() is now const.
250 * Revision 1.8 2001/06/03 19:12:07 oes
253 * Revision 1.7 2001/05/28 16:14:00 jongfoster
254 * Fixing bug in LOG_LEVEL_LOG
256 * Revision 1.6 2001/05/26 17:28:32 jongfoster
257 * Fixed LOG_LEVEL_LOG
259 * Revision 1.5 2001/05/26 15:26:15 jongfoster
260 * ACL feature now provides more security by immediately dropping
261 * connections from untrusted hosts.
263 * Revision 1.4 2001/05/26 00:37:42 jongfoster
264 * Cosmetic indentation correction.
266 * Revision 1.3 2001/05/25 21:57:54 jongfoster
267 * Now gives a warning under Windows if you try to bind
268 * it to a port that's already in use.
270 * Revision 1.2 2001/05/17 23:01:01 oes
271 * - Cleaned CRLF's from the sources and related files
273 * Revision 1.1.1.1 2001/05/15 13:58:54 oes
274 * Initial import of version 2.9.3 source tree
277 *********************************************************************/
287 #include <sys/types.h>
295 #include <sys/timeb.h>
303 #include <sys/time.h>
304 #include <netinet/in.h>
305 #include <sys/ioctl.h>
307 #include <sys/socket.h>
310 #include <netinet/tcp.h>
312 #include <arpa/inet.h>
318 #if defined(__EMX__) || defined (__OS2__)
319 #include <sys/select.h> /* OS/2/EMX needs a little help with select */
329 #ifdef FEATURE_PTHREAD
331 /* jcc.h is for mutex semaphores only */
332 #endif /* def FEATURE_PTHREAD */
334 #include "jbsockets.h"
337 #include "miscutil.h"
339 const char jbsockets_h_rcs[] = JBSOCKETS_H_VERSION;
342 * Maximum number of gethostbyname(_r) retries in case of
343 * soft errors (TRY_AGAIN).
344 * XXX: Does it make sense to make this a config option?
346 #define MAX_DNS_RETRIES 10
348 #define MAX_LISTEN_BACKLOG 128
351 /*********************************************************************
353 * Function : connect_to
355 * Description : Open a socket and connect to it. Will check
356 * that this is allowed according to ACL.
359 * 1 : host = hostname to connect to
360 * 2 : portnum = port to connent on (XXX: should be unsigned)
361 * 3 : csp = Current client state (buffers, headers, etc...)
362 * Not modified, only used for source IP and ACL.
364 * Returns : JB_INVALID_SOCKET => failure, else it is the socket
367 *********************************************************************/
369 /* Getaddrinfo implementation */
370 jb_socket connect_to(const char *host, int portnum, struct client_state *csp)
372 struct addrinfo hints, *result, *rp;
377 struct timeval tv[1];
378 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
380 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
384 struct access_control_addr dst[1];
385 #endif /* def FEATURE_ACL */
387 retval = snprintf(service, sizeof(service), "%d", portnum);
388 if ((-1 == retval) || (sizeof(service) <= retval))
390 log_error(LOG_LEVEL_ERROR,
391 "Port number (%d) ASCII decimal representation doesn't fit into 6 bytes",
393 csp->http->host_ip_addr_str = strdup("unknown");
394 return(JB_INVALID_SOCKET);
397 memset((char *)&hints, 0, sizeof(hints));
398 hints.ai_family = AF_UNSPEC;
399 hints.ai_socktype = SOCK_STREAM;
400 hints.ai_flags = AI_ADDRCONFIG | AI_NUMERICSERV; /* avoid service look-up */
401 if ((retval = getaddrinfo(host, service, &hints, &result)))
403 log_error(LOG_LEVEL_INFO,
404 "Can not resolve %s: %s", host, gai_strerror(retval));
405 csp->http->host_ip_addr_str = strdup("unknown");
406 return(JB_INVALID_SOCKET);
409 for (rp = result; rp != NULL; rp = rp->ai_next)
413 memcpy(&dst->addr, rp->ai_addr, rp->ai_addrlen);
415 if (block_acl(dst, csp))
424 #endif /* def FEATURE_ACL */
426 csp->http->host_ip_addr_str = malloc(NI_MAXHOST);
427 retval = getnameinfo(rp->ai_addr, rp->ai_addrlen,
428 csp->http->host_ip_addr_str, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
429 if (!csp->http->host_ip_addr_str || retval)
431 log_error(LOG_LEVEL_ERROR,
432 "Can not save csp->http->host_ip_addr_str: %s",
433 (csp->http->host_ip_addr_str) ?
434 gai_strerror(retval) : "Insufficient memory");
435 freez(csp->http->host_ip_addr_str);
440 if ((fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol)) ==
443 if ((fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol)) < 0)
450 { /* turn off TCP coalescence */
452 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
454 #endif /* def TCP_NODELAY */
456 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
457 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
460 fcntl(fd, F_SETFL, flags);
462 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
465 while (connect(fd, rp->ai_addr, rp->ai_addrlen) == JB_INVALID_SOCKET)
468 if (errno == WSAEINPROGRESS)
470 if (sock_errno() == EINPROGRESS)
471 #else /* ifndef _WIN32 */
472 if (errno == EINPROGRESS)
473 #endif /* ndef _WIN32 || __OS2__ */
479 if (sock_errno() != EINTR)
494 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
498 fcntl(fd, F_SETFL, flags);
500 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
502 /* wait for connection to complete */
509 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
510 if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
516 break; /* for; Connection established; don't try other addresses */
519 freeaddrinfo(result);
522 log_error(LOG_LEVEL_INFO,
523 "Could not connect to TCP/[%s]:%s", host, service);
524 return(JB_INVALID_SOCKET);
527 * XXX: Current connection verification (EINPROGRESS && select()
528 * for writing) is not sufficient. E.g. on Linux-2.6.27 with glibc-2.6
529 * select returns socket ready for writing, however subsequential
530 * write(2) fails with ENOCONNECT. Read Linux connect(2) man page
531 * about non-blocking sockets.
532 * Thus we can't log here that the socket is connected.
534 /* log_error(LOG_LEVEL_INFO, "Connected to TCP/[%s]:%s", host, service); */
540 #else /* ndef HAVE_RFC2553 */
541 /* Pre-getaddrinfo implementation */
543 jb_socket connect_to(const char *host, int portnum, struct client_state *csp)
545 struct sockaddr_in inaddr;
549 struct timeval tv[1];
550 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
552 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
555 struct access_control_addr dst[1];
556 #endif /* def FEATURE_ACL */
558 memset((char *)&inaddr, 0, sizeof inaddr);
560 if ((addr = resolve_hostname_to_ip(host)) == INADDR_NONE)
562 csp->http->host_ip_addr_str = strdup("unknown");
563 return(JB_INVALID_SOCKET);
567 dst->addr = ntohl(addr);
570 if (block_acl(dst, csp))
577 return(JB_INVALID_SOCKET);
579 #endif /* def FEATURE_ACL */
581 inaddr.sin_addr.s_addr = addr;
582 inaddr.sin_family = AF_INET;
583 csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
586 if (sizeof(inaddr.sin_port) == sizeof(short))
587 #endif /* ndef _WIN32 */
589 inaddr.sin_port = htons((unsigned short) portnum);
594 inaddr.sin_port = htonl((unsigned long)portnum);
596 #endif /* ndef _WIN32 */
599 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) == JB_INVALID_SOCKET)
601 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) < 0)
604 return(JB_INVALID_SOCKET);
608 { /* turn off TCP coalescence */
610 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
612 #endif /* def TCP_NODELAY */
614 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
615 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
618 fcntl(fd, F_SETFL, flags);
620 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
622 while (connect(fd, (struct sockaddr *) & inaddr, sizeof inaddr) == JB_INVALID_SOCKET)
625 if (errno == WSAEINPROGRESS)
627 if (sock_errno() == EINPROGRESS)
628 #else /* ifndef _WIN32 */
629 if (errno == EINPROGRESS)
630 #endif /* ndef _WIN32 || __OS2__ */
636 if (sock_errno() != EINTR)
642 return(JB_INVALID_SOCKET);
646 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
650 fcntl(fd, F_SETFL, flags);
652 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
654 /* wait for connection to complete */
661 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
662 if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
665 return(JB_INVALID_SOCKET);
670 #endif /* ndef HAVE_RFC2553 */
673 /*********************************************************************
675 * Function : write_socket
677 * Description : Write the contents of buf (for n bytes) to socket fd.
680 * 1 : fd = file descriptor (aka. handle) of socket to write to.
681 * 2 : buf = pointer to data to be written.
682 * 3 : len = length of data to be written to the socket "fd".
684 * Returns : 0 on success (entire buffer sent).
687 *********************************************************************/
689 int write_socket(jb_socket fd, const char *buf, ssize_t len)
691 int write_socket(jb_socket fd, const char *buf, size_t len)
699 if (len < 0) /* constant condition - size_t isn't ever negative */
704 log_error(LOG_LEVEL_LOG, "%N", len, buf);
707 return (send(fd, buf, (int)len, 0) != (int)len);
708 #elif defined(__BEOS__) || defined(AMIGA)
709 return (send(fd, buf, len, 0) != len);
710 #elif defined(__OS2__)
712 * Break the data up into SOCKET_SEND_MAX chunks for sending...
713 * OS/2 seemed to complain when the chunks were too large.
715 #define SOCKET_SEND_MAX 65000
717 int write_len = 0, send_len, send_rc = 0, i = 0;
718 while ((i < len) && (send_rc != -1))
720 if ((i + SOCKET_SEND_MAX) > len)
723 send_len = SOCKET_SEND_MAX;
724 send_rc = send(fd,(char*)buf + i, send_len, 0);
732 return (write(fd, buf, len) != len);
738 /*********************************************************************
740 * Function : read_socket
742 * Description : Read from a TCP/IP socket in a platform independent way.
745 * 1 : fd = file descriptor of the socket to read
746 * 2 : buf = pointer to buffer where data will be written
747 * Must be >= len bytes long.
748 * 3 : len = maximum number of bytes to read
750 * Returns : On success, the number of bytes read is returned (zero
751 * indicates end of file), and the file position is advanced
752 * by this number. It is not an error if this number is
753 * smaller than the number of bytes requested; this may hap-
754 * pen for example because fewer bytes are actually available
755 * right now (maybe because we were close to end-of-file, or
756 * because we are reading from a pipe, or from a terminal,
757 * or because read() was interrupted by a signal). On error,
758 * -1 is returned, and errno is set appropriately. In this
759 * case it is left unspecified whether the file position (if
762 *********************************************************************/
763 int read_socket(jb_socket fd, char *buf, int len)
771 return(recv(fd, buf, len, 0));
772 #elif defined(__BEOS__) || defined(AMIGA) || defined(__OS2__)
773 return(recv(fd, buf, (size_t)len, 0));
775 return(read(fd, buf, (size_t)len));
780 /*********************************************************************
782 * Function : data_is_available
784 * Description : Waits for data to arrive on a socket.
787 * 1 : fd = file descriptor of the socket to read
788 * 2 : seconds_to_wait = number of seconds after which we give up.
790 * Returns : TRUE if data arrived in time,
793 *********************************************************************/
794 int data_is_available(jb_socket fd, int seconds_to_wait)
797 struct timeval timeout;
800 memset(&timeout, 0, sizeof(timeout));
801 timeout.tv_sec = seconds_to_wait;
804 /* Copy and pasted from jcc.c ... */
805 memset(&rfds, 0, sizeof(fd_set));
811 n = select(fd+1, &rfds, NULL, NULL, &timeout);
814 * XXX: Do we care about the different error conditions?
820 /*********************************************************************
822 * Function : close_socket
824 * Description : Closes a TCP/IP socket
827 * 1 : fd = file descriptor of socket to be closed
831 *********************************************************************/
832 void close_socket(jb_socket fd)
834 #if defined(_WIN32) || defined(__BEOS__)
838 #elif defined(__OS2__)
847 /*********************************************************************
849 * Function : bind_port
851 * Description : Call socket, set socket options, and listen.
852 * Called by listen_loop to "boot up" our proxy address.
855 * 1 : hostnam = TCP/IP address to bind/listen to
856 * 2 : portnum = port to listen on
857 * 3 : pfd = pointer used to return file descriptor.
859 * Returns : if success, returns 0 and sets *pfd.
860 * if failure, returns -3 if address is in use,
861 * -2 if address unresolvable,
863 *********************************************************************/
864 int bind_port(const char *hostnam, int portnum, jb_socket *pfd)
867 struct addrinfo hints;
868 struct addrinfo *result, *rp;
870 * XXX: portnum should be a string to allow symbolic service
871 * names in the configuration file and to avoid the following
877 struct sockaddr_in inaddr;
878 #endif /* def HAVE_RFC2553 */
882 #endif /* ndef _WIN32 */
884 *pfd = JB_INVALID_SOCKET;
887 retval = snprintf(servnam, sizeof(servnam), "%d", portnum);
888 if ((-1 == retval) || (sizeof(servnam) <= retval))
890 log_error(LOG_LEVEL_ERROR,
891 "Port number (%d) ASCII decimal representation doesn't fit into 6 bytes",
896 memset(&hints, 0, sizeof(struct addrinfo));
897 if ((hostnam == NULL) || !strcmpic(hostnam, "localhost"))
900 * XXX: This is a hack. The right thing to do
901 * would be to bind to both AF_INET and AF_INET6.
902 * This will also fail if there is no AF_INET
905 hints.ai_family = AF_INET;
909 hints.ai_family = AF_UNSPEC;
911 hints.ai_socktype = SOCK_STREAM;
912 hints.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
913 hints.ai_protocol = 0; /* Realy any stream protocol or TCP only */
914 hints.ai_canonname = NULL;
915 hints.ai_addr = NULL;
916 hints.ai_next = NULL;
918 if ((retval = getaddrinfo(hostnam, servnam, &hints, &result)))
920 log_error(LOG_LEVEL_ERROR,
921 "Can not resolve %s: %s", hostnam, gai_strerror(retval));
925 memset((char *)&inaddr, '\0', sizeof inaddr);
927 inaddr.sin_family = AF_INET;
928 inaddr.sin_addr.s_addr = resolve_hostname_to_ip(hostnam);
930 if (inaddr.sin_addr.s_addr == INADDR_NONE)
936 if (sizeof(inaddr.sin_port) == sizeof(short))
937 #endif /* ndef _WIN32 */
939 inaddr.sin_port = htons((unsigned short) portnum);
944 inaddr.sin_port = htonl((unsigned long) portnum);
946 #endif /* ndef _WIN32 */
947 #endif /* def HAVE_RFC2553 */
950 for (rp = result; rp != NULL; rp = rp->ai_next)
952 fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
954 fd = socket(AF_INET, SOCK_STREAM, 0);
955 #endif /* def HAVE_RFC2553 */
958 if (fd == JB_INVALID_SOCKET)
972 * This is not needed for Win32 - in fact, it stops
973 * duplicate instances of Privoxy from being caught.
975 * On UNIX, we assume the user is sensible enough not
976 * to start Privoxy multiple times on the same IP.
977 * Without this, stopping and restarting Privoxy
978 * from a script fails.
979 * Note: SO_REUSEADDR is meant to only take over
980 * sockets which are *not* in listen state in Linux,
981 * e.g. sockets in TIME_WAIT. YMMV.
983 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
984 #endif /* ndef _WIN32 */
987 if (bind(fd, rp->ai_addr, rp->ai_addrlen) < 0)
989 if (bind(fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
993 errno = WSAGetLastError();
994 if (errno == WSAEADDRINUSE)
996 if (errno == EADDRINUSE)
1000 freeaddrinfo(result);
1008 #ifndef HAVE_RFC2553
1017 /* bind() succeeded, escape from for-loop */
1019 * XXX: Support multiple listening sockets (e.g. localhost
1020 * resolves to AF_INET and AF_INET6, but only the first address
1027 freeaddrinfo(result);
1030 /* All bind()s failed */
1033 #endif /* ndef HAVE_RFC2553 */
1035 while (listen(fd, MAX_LISTEN_BACKLOG) == -1)
1049 /*********************************************************************
1051 * Function : get_host_information
1053 * Description : Determines the IP address the client used to
1054 * reach us and the hostname associated with it.
1056 * XXX: Most of the code has been copy and pasted
1057 * from accept_connection() and not all of the
1058 * ifdefs paths have been tested afterwards.
1061 * 1 : afd = File descriptor returned from accept().
1062 * 2 : ip_address = Pointer to return the pointer to
1063 * the ip address string.
1064 * 3 : hostname = Pointer to return the pointer to
1065 * the hostname or NULL if the caller
1066 * isn't interested in it.
1070 *********************************************************************/
1071 void get_host_information(jb_socket afd, char **ip_address, char **hostname)
1074 struct sockaddr_storage server;
1077 struct sockaddr_in server;
1078 struct hostent *host = NULL;
1079 #endif /* HAVE_RFC2553 */
1080 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
1081 /* according to accept_connection() this fixes a warning. */
1082 int s_length, s_length_provided;
1084 socklen_t s_length, s_length_provided;
1086 #ifndef HAVE_RFC2553
1087 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS) || defined(HAVE_GETHOSTBYADDR_R_7_ARGS) || defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
1088 struct hostent result;
1089 #if defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
1090 struct hostent_data hdata;
1092 char hbuf[HOSTENT_BUFFER_SIZE];
1094 #endif /* def HAVE_GETHOSTBYADDR_R_5_ARGS */
1095 #endif /* def HAVE_GETHOSTBYADDR_R_(8|7|5)_ARGS */
1096 #endif /* ifndef HAVE_RFC2553 */
1097 s_length = s_length_provided = sizeof(server);
1099 if (NULL != hostname)
1105 if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
1107 if (s_length > s_length_provided)
1109 log_error(LOG_LEVEL_ERROR, "getsockname() truncated server address");
1113 *ip_address = malloc(NI_MAXHOST);
1114 retval = getnameinfo((struct sockaddr *) &server, s_length,
1115 *ip_address, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
1118 log_error(LOG_LEVEL_ERROR,
1119 "Unable to print my own IP address: %s", gai_strerror(retval));
1124 *ip_address = strdup(inet_ntoa(server.sin_addr));
1125 #endif /* HAVE_RFC2553 */
1126 if (NULL == hostname)
1129 * We're done here, the caller isn't
1130 * interested in knowing the hostname.
1136 *hostname = malloc(NI_MAXHOST);
1137 retval = getnameinfo((struct sockaddr *) &server, s_length,
1138 *hostname, NI_MAXHOST, NULL, 0, NI_NAMEREQD);
1141 log_error(LOG_LEVEL_ERROR,
1142 "Unable to resolve my own IP address: %s", gai_strerror(retval));
1146 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS)
1147 gethostbyaddr_r((const char *)&server.sin_addr,
1148 sizeof(server.sin_addr), AF_INET,
1149 &result, hbuf, HOSTENT_BUFFER_SIZE,
1151 #elif defined(HAVE_GETHOSTBYADDR_R_7_ARGS)
1152 host = gethostbyaddr_r((const char *)&server.sin_addr,
1153 sizeof(server.sin_addr), AF_INET,
1154 &result, hbuf, HOSTENT_BUFFER_SIZE, &thd_err);
1155 #elif defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
1156 if (0 == gethostbyaddr_r((const char *)&server.sin_addr,
1157 sizeof(server.sin_addr), AF_INET,
1166 #elif FEATURE_PTHREAD
1167 privoxy_mutex_lock(&resolver_mutex);
1168 host = gethostbyaddr((const char *)&server.sin_addr,
1169 sizeof(server.sin_addr), AF_INET);
1170 privoxy_mutex_unlock(&resolver_mutex);
1172 host = gethostbyaddr((const char *)&server.sin_addr,
1173 sizeof(server.sin_addr), AF_INET);
1177 log_error(LOG_LEVEL_ERROR, "Unable to get my own hostname: %E\n");
1181 *hostname = strdup(host->h_name);
1183 #endif /* else def HAVE_RFC2553 */
1190 /*********************************************************************
1192 * Function : accept_connection
1194 * Description : Accepts a connection on a socket. Socket must have
1195 * been created using bind_port().
1198 * 1 : csp = Client state, cfd, ip_addr_str, and
1199 * ip_addr_long will be set by this routine.
1200 * 2 : fd = file descriptor returned from bind_port
1202 * Returns : when a connection is accepted, it returns 1 (TRUE).
1203 * On an error it returns 0 (FALSE).
1205 *********************************************************************/
1206 int accept_connection(struct client_state * csp, jb_socket fd)
1209 /* XXX: client is stored directly into csp->tcp_addr */
1210 #define client (csp->tcp_addr)
1213 struct sockaddr_in client;
1216 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
1217 /* Wierdness - fix a warning. */
1223 c_length = sizeof(client);
1226 afd = accept (fd, (struct sockaddr *) &client, &c_length);
1227 if (afd == JB_INVALID_SOCKET)
1234 afd = accept (fd, (struct sockaddr *) &client, &c_length);
1235 } while (afd < 1 && errno == EINTR);
1244 csp->ip_addr_str = malloc(NI_MAXHOST);
1245 retval = getnameinfo((struct sockaddr *) &client, c_length,
1246 csp->ip_addr_str, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
1247 if (!csp->ip_addr_str || retval)
1249 log_error(LOG_LEVEL_ERROR, "Can not save csp->ip_addr_str: %s",
1250 (csp->ip_addr_str) ? gai_strerror(retval) : "Insuffcient memory");
1251 freez(csp->ip_addr_str);
1255 csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
1256 csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
1257 #endif /* def HAVE_RFC2553 */
1264 /*********************************************************************
1266 * Function : resolve_hostname_to_ip
1268 * Description : Resolve a hostname to an internet tcp/ip address.
1269 * NULL or an empty string resolve to INADDR_ANY.
1272 * 1 : host = hostname to resolve
1274 * Returns : INADDR_NONE => failure, INADDR_ANY or tcp/ip address if succesful.
1276 *********************************************************************/
1277 unsigned long resolve_hostname_to_ip(const char *host)
1279 struct sockaddr_in inaddr;
1280 struct hostent *hostp;
1281 unsigned int dns_retries = 0;
1282 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS) || defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
1283 struct hostent result;
1284 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
1285 char hbuf[HOSTENT_BUFFER_SIZE];
1287 #else /* defined(HAVE_GETHOSTBYNAME_R_3_ARGS) */
1288 struct hostent_data hdata;
1289 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5)_ARGS */
1290 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
1292 if ((host == NULL) || (*host == '\0'))
1297 memset((char *) &inaddr, 0, sizeof inaddr);
1299 if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
1301 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS)
1302 while (gethostbyname_r(host, &result, hbuf,
1303 HOSTENT_BUFFER_SIZE, &hostp, &thd_err)
1304 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1306 log_error(LOG_LEVEL_ERROR,
1307 "Timeout #%u while trying to resolve %s. Trying again.",
1310 #elif defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
1311 while (NULL == (hostp = gethostbyname_r(host, &result,
1312 hbuf, HOSTENT_BUFFER_SIZE, &thd_err))
1313 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1315 log_error(LOG_LEVEL_ERROR,
1316 "Timeout #%u while trying to resolve %s. Trying again.",
1319 #elif defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
1321 * XXX: Doesn't retry in case of soft errors.
1322 * Does this gethostbyname_r version set h_errno?
1324 if (0 == gethostbyname_r(host, &result, &hdata))
1332 #elif FEATURE_PTHREAD
1333 privoxy_mutex_lock(&resolver_mutex);
1334 while (NULL == (hostp = gethostbyname(host))
1335 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1337 log_error(LOG_LEVEL_ERROR,
1338 "Timeout #%u while trying to resolve %s. Trying again.",
1341 privoxy_mutex_unlock(&resolver_mutex);
1343 while (NULL == (hostp = gethostbyname(host))
1344 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1346 log_error(LOG_LEVEL_ERROR,
1347 "Timeout #%u while trying to resolve %s. Trying again.",
1350 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
1352 * On Mac OSX, if a domain exists but doesn't have a type A
1353 * record associated with it, the h_addr member of the struct
1354 * hostent returned by gethostbyname is NULL, even if h_length
1355 * is 4. Therefore the second test below.
1357 if (hostp == NULL || hostp->h_addr == NULL)
1360 log_error(LOG_LEVEL_ERROR, "could not resolve hostname %s", host);
1361 return(INADDR_NONE);
1363 if (hostp->h_addrtype != AF_INET)
1366 errno = WSAEPROTOTYPE;
1370 log_error(LOG_LEVEL_ERROR, "hostname %s resolves to unknown address type.", host);
1371 return(INADDR_NONE);
1374 (char *) &inaddr.sin_addr,
1375 (char *) hostp->h_addr,
1376 sizeof(inaddr.sin_addr)
1379 return(inaddr.sin_addr.s_addr);